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 46 bool __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 76 void ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata, 77 bool update_bss) 78 { 79 if (__ieee80211_recalc_txpower(sdata) || 80 (update_bss && ieee80211_sdata_running(sdata))) 81 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_TXPOWER); 82 } 83 84 static u32 __ieee80211_idle_off(struct ieee80211_local *local) 85 { 86 if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE)) 87 return 0; 88 89 local->hw.conf.flags &= ~IEEE80211_CONF_IDLE; 90 return IEEE80211_CONF_CHANGE_IDLE; 91 } 92 93 static u32 __ieee80211_idle_on(struct ieee80211_local *local) 94 { 95 if (local->hw.conf.flags & IEEE80211_CONF_IDLE) 96 return 0; 97 98 ieee80211_flush_queues(local, NULL, false); 99 100 local->hw.conf.flags |= IEEE80211_CONF_IDLE; 101 return IEEE80211_CONF_CHANGE_IDLE; 102 } 103 104 static u32 __ieee80211_recalc_idle(struct ieee80211_local *local, 105 bool force_active) 106 { 107 bool working, scanning, active; 108 unsigned int led_trig_start = 0, led_trig_stop = 0; 109 110 lockdep_assert_held(&local->mtx); 111 112 active = force_active || 113 !list_empty(&local->chanctx_list) || 114 local->monitors; 115 116 working = !local->ops->remain_on_channel && 117 !list_empty(&local->roc_list); 118 119 scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) || 120 test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning); 121 122 if (working || scanning) 123 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK; 124 else 125 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK; 126 127 if (active) 128 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED; 129 else 130 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED; 131 132 ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop); 133 134 if (working || scanning || active) 135 return __ieee80211_idle_off(local); 136 return __ieee80211_idle_on(local); 137 } 138 139 u32 ieee80211_idle_off(struct ieee80211_local *local) 140 { 141 return __ieee80211_recalc_idle(local, true); 142 } 143 144 void ieee80211_recalc_idle(struct ieee80211_local *local) 145 { 146 u32 change = __ieee80211_recalc_idle(local, false); 147 if (change) 148 ieee80211_hw_config(local, change); 149 } 150 151 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu) 152 { 153 if (new_mtu < 256 || new_mtu > IEEE80211_MAX_DATA_LEN) 154 return -EINVAL; 155 156 dev->mtu = new_mtu; 157 return 0; 158 } 159 160 static int ieee80211_verify_mac(struct ieee80211_sub_if_data *sdata, u8 *addr, 161 bool check_dup) 162 { 163 struct ieee80211_local *local = sdata->local; 164 struct ieee80211_sub_if_data *iter; 165 u64 new, mask, tmp; 166 u8 *m; 167 int ret = 0; 168 169 if (is_zero_ether_addr(local->hw.wiphy->addr_mask)) 170 return 0; 171 172 m = addr; 173 new = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 174 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 175 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 176 177 m = local->hw.wiphy->addr_mask; 178 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 179 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 180 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 181 182 if (!check_dup) 183 return ret; 184 185 mutex_lock(&local->iflist_mtx); 186 list_for_each_entry(iter, &local->interfaces, list) { 187 if (iter == sdata) 188 continue; 189 190 if (iter->vif.type == NL80211_IFTYPE_MONITOR && 191 !(iter->u.mntr_flags & MONITOR_FLAG_ACTIVE)) 192 continue; 193 194 m = iter->vif.addr; 195 tmp = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 196 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 197 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 198 199 if ((new & ~mask) != (tmp & ~mask)) { 200 ret = -EINVAL; 201 break; 202 } 203 } 204 mutex_unlock(&local->iflist_mtx); 205 206 return ret; 207 } 208 209 static int ieee80211_change_mac(struct net_device *dev, void *addr) 210 { 211 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 212 struct sockaddr *sa = addr; 213 bool check_dup = true; 214 int ret; 215 216 if (ieee80211_sdata_running(sdata)) 217 return -EBUSY; 218 219 if (sdata->vif.type == NL80211_IFTYPE_MONITOR && 220 !(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE)) 221 check_dup = false; 222 223 ret = ieee80211_verify_mac(sdata, sa->sa_data, check_dup); 224 if (ret) 225 return ret; 226 227 ret = eth_mac_addr(dev, sa); 228 229 if (ret == 0) 230 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN); 231 232 return ret; 233 } 234 235 static inline int identical_mac_addr_allowed(int type1, int type2) 236 { 237 return type1 == NL80211_IFTYPE_MONITOR || 238 type2 == NL80211_IFTYPE_MONITOR || 239 type1 == NL80211_IFTYPE_P2P_DEVICE || 240 type2 == NL80211_IFTYPE_P2P_DEVICE || 241 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) || 242 (type1 == NL80211_IFTYPE_WDS && 243 (type2 == NL80211_IFTYPE_WDS || 244 type2 == NL80211_IFTYPE_AP)) || 245 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) || 246 (type1 == NL80211_IFTYPE_AP_VLAN && 247 (type2 == NL80211_IFTYPE_AP || 248 type2 == NL80211_IFTYPE_AP_VLAN)); 249 } 250 251 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata, 252 enum nl80211_iftype iftype) 253 { 254 struct ieee80211_local *local = sdata->local; 255 struct ieee80211_sub_if_data *nsdata; 256 int ret; 257 258 ASSERT_RTNL(); 259 260 /* we hold the RTNL here so can safely walk the list */ 261 list_for_each_entry(nsdata, &local->interfaces, list) { 262 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) { 263 /* 264 * Only OCB and monitor mode may coexist 265 */ 266 if ((sdata->vif.type == NL80211_IFTYPE_OCB && 267 nsdata->vif.type != NL80211_IFTYPE_MONITOR) || 268 (sdata->vif.type != NL80211_IFTYPE_MONITOR && 269 nsdata->vif.type == NL80211_IFTYPE_OCB)) 270 return -EBUSY; 271 272 /* 273 * Allow only a single IBSS interface to be up at any 274 * time. This is restricted because beacon distribution 275 * cannot work properly if both are in the same IBSS. 276 * 277 * To remove this restriction we'd have to disallow them 278 * from setting the same SSID on different IBSS interfaces 279 * belonging to the same hardware. Then, however, we're 280 * faced with having to adopt two different TSF timers... 281 */ 282 if (iftype == NL80211_IFTYPE_ADHOC && 283 nsdata->vif.type == NL80211_IFTYPE_ADHOC) 284 return -EBUSY; 285 /* 286 * will not add another interface while any channel 287 * switch is active. 288 */ 289 if (nsdata->vif.csa_active) 290 return -EBUSY; 291 292 /* 293 * The remaining checks are only performed for interfaces 294 * with the same MAC address. 295 */ 296 if (!ether_addr_equal(sdata->vif.addr, 297 nsdata->vif.addr)) 298 continue; 299 300 /* 301 * check whether it may have the same address 302 */ 303 if (!identical_mac_addr_allowed(iftype, 304 nsdata->vif.type)) 305 return -ENOTUNIQ; 306 307 /* 308 * can only add VLANs to enabled APs 309 */ 310 if (iftype == NL80211_IFTYPE_AP_VLAN && 311 nsdata->vif.type == NL80211_IFTYPE_AP) 312 sdata->bss = &nsdata->u.ap; 313 } 314 } 315 316 mutex_lock(&local->chanctx_mtx); 317 ret = ieee80211_check_combinations(sdata, NULL, 0, 0); 318 mutex_unlock(&local->chanctx_mtx); 319 return ret; 320 } 321 322 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata, 323 enum nl80211_iftype iftype) 324 { 325 int n_queues = sdata->local->hw.queues; 326 int i; 327 328 if (iftype != NL80211_IFTYPE_P2P_DEVICE) { 329 for (i = 0; i < IEEE80211_NUM_ACS; i++) { 330 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] == 331 IEEE80211_INVAL_HW_QUEUE)) 332 return -EINVAL; 333 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >= 334 n_queues)) 335 return -EINVAL; 336 } 337 } 338 339 if ((iftype != NL80211_IFTYPE_AP && 340 iftype != NL80211_IFTYPE_P2P_GO && 341 iftype != NL80211_IFTYPE_MESH_POINT) || 342 !ieee80211_hw_check(&sdata->local->hw, QUEUE_CONTROL)) { 343 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE; 344 return 0; 345 } 346 347 if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE)) 348 return -EINVAL; 349 350 if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues)) 351 return -EINVAL; 352 353 return 0; 354 } 355 356 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata, 357 const int offset) 358 { 359 struct ieee80211_local *local = sdata->local; 360 u32 flags = sdata->u.mntr_flags; 361 362 #define ADJUST(_f, _s) do { \ 363 if (flags & MONITOR_FLAG_##_f) \ 364 local->fif_##_s += offset; \ 365 } while (0) 366 367 ADJUST(FCSFAIL, fcsfail); 368 ADJUST(PLCPFAIL, plcpfail); 369 ADJUST(CONTROL, control); 370 ADJUST(CONTROL, pspoll); 371 ADJUST(OTHER_BSS, other_bss); 372 373 #undef ADJUST 374 } 375 376 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata) 377 { 378 struct ieee80211_local *local = sdata->local; 379 int i; 380 381 for (i = 0; i < IEEE80211_NUM_ACS; i++) { 382 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) 383 sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE; 384 else if (local->hw.queues >= IEEE80211_NUM_ACS) 385 sdata->vif.hw_queue[i] = i; 386 else 387 sdata->vif.hw_queue[i] = 0; 388 } 389 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE; 390 } 391 392 int ieee80211_add_virtual_monitor(struct ieee80211_local *local) 393 { 394 struct ieee80211_sub_if_data *sdata; 395 int ret; 396 397 if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF)) 398 return 0; 399 400 ASSERT_RTNL(); 401 402 if (local->monitor_sdata) 403 return 0; 404 405 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL); 406 if (!sdata) 407 return -ENOMEM; 408 409 /* set up data */ 410 sdata->local = local; 411 sdata->vif.type = NL80211_IFTYPE_MONITOR; 412 snprintf(sdata->name, IFNAMSIZ, "%s-monitor", 413 wiphy_name(local->hw.wiphy)); 414 sdata->wdev.iftype = NL80211_IFTYPE_MONITOR; 415 416 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM; 417 418 ieee80211_set_default_queues(sdata); 419 420 ret = drv_add_interface(local, sdata); 421 if (WARN_ON(ret)) { 422 /* ok .. stupid driver, it asked for this! */ 423 kfree(sdata); 424 return ret; 425 } 426 427 ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR); 428 if (ret) { 429 kfree(sdata); 430 return ret; 431 } 432 433 mutex_lock(&local->iflist_mtx); 434 rcu_assign_pointer(local->monitor_sdata, sdata); 435 mutex_unlock(&local->iflist_mtx); 436 437 mutex_lock(&local->mtx); 438 ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef, 439 IEEE80211_CHANCTX_EXCLUSIVE); 440 mutex_unlock(&local->mtx); 441 if (ret) { 442 mutex_lock(&local->iflist_mtx); 443 RCU_INIT_POINTER(local->monitor_sdata, NULL); 444 mutex_unlock(&local->iflist_mtx); 445 synchronize_net(); 446 drv_remove_interface(local, sdata); 447 kfree(sdata); 448 return ret; 449 } 450 451 return 0; 452 } 453 454 void ieee80211_del_virtual_monitor(struct ieee80211_local *local) 455 { 456 struct ieee80211_sub_if_data *sdata; 457 458 if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF)) 459 return; 460 461 ASSERT_RTNL(); 462 463 mutex_lock(&local->iflist_mtx); 464 465 sdata = rcu_dereference_protected(local->monitor_sdata, 466 lockdep_is_held(&local->iflist_mtx)); 467 if (!sdata) { 468 mutex_unlock(&local->iflist_mtx); 469 return; 470 } 471 472 RCU_INIT_POINTER(local->monitor_sdata, NULL); 473 mutex_unlock(&local->iflist_mtx); 474 475 synchronize_net(); 476 477 mutex_lock(&local->mtx); 478 ieee80211_vif_release_channel(sdata); 479 mutex_unlock(&local->mtx); 480 481 drv_remove_interface(local, sdata); 482 483 kfree(sdata); 484 } 485 486 /* 487 * NOTE: Be very careful when changing this function, it must NOT return 488 * an error on interface type changes that have been pre-checked, so most 489 * checks should be in ieee80211_check_concurrent_iface. 490 */ 491 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up) 492 { 493 struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev); 494 struct net_device *dev = wdev->netdev; 495 struct ieee80211_local *local = sdata->local; 496 struct sta_info *sta; 497 u32 changed = 0; 498 int res; 499 u32 hw_reconf_flags = 0; 500 501 switch (sdata->vif.type) { 502 case NL80211_IFTYPE_WDS: 503 if (!is_valid_ether_addr(sdata->u.wds.remote_addr)) 504 return -ENOLINK; 505 break; 506 case NL80211_IFTYPE_AP_VLAN: { 507 struct ieee80211_sub_if_data *master; 508 509 if (!sdata->bss) 510 return -ENOLINK; 511 512 mutex_lock(&local->mtx); 513 list_add(&sdata->u.vlan.list, &sdata->bss->vlans); 514 mutex_unlock(&local->mtx); 515 516 master = container_of(sdata->bss, 517 struct ieee80211_sub_if_data, u.ap); 518 sdata->control_port_protocol = 519 master->control_port_protocol; 520 sdata->control_port_no_encrypt = 521 master->control_port_no_encrypt; 522 sdata->vif.cab_queue = master->vif.cab_queue; 523 memcpy(sdata->vif.hw_queue, master->vif.hw_queue, 524 sizeof(sdata->vif.hw_queue)); 525 sdata->vif.bss_conf.chandef = master->vif.bss_conf.chandef; 526 527 mutex_lock(&local->key_mtx); 528 sdata->crypto_tx_tailroom_needed_cnt += 529 master->crypto_tx_tailroom_needed_cnt; 530 mutex_unlock(&local->key_mtx); 531 532 break; 533 } 534 case NL80211_IFTYPE_AP: 535 sdata->bss = &sdata->u.ap; 536 break; 537 case NL80211_IFTYPE_MESH_POINT: 538 case NL80211_IFTYPE_STATION: 539 case NL80211_IFTYPE_MONITOR: 540 case NL80211_IFTYPE_ADHOC: 541 case NL80211_IFTYPE_P2P_DEVICE: 542 case NL80211_IFTYPE_OCB: 543 /* no special treatment */ 544 break; 545 case NL80211_IFTYPE_UNSPECIFIED: 546 case NUM_NL80211_IFTYPES: 547 case NL80211_IFTYPE_P2P_CLIENT: 548 case NL80211_IFTYPE_P2P_GO: 549 /* cannot happen */ 550 WARN_ON(1); 551 break; 552 } 553 554 if (local->open_count == 0) { 555 res = drv_start(local); 556 if (res) 557 goto err_del_bss; 558 /* we're brought up, everything changes */ 559 hw_reconf_flags = ~0; 560 ieee80211_led_radio(local, true); 561 ieee80211_mod_tpt_led_trig(local, 562 IEEE80211_TPT_LEDTRIG_FL_RADIO, 0); 563 } 564 565 /* 566 * Copy the hopefully now-present MAC address to 567 * this interface, if it has the special null one. 568 */ 569 if (dev && is_zero_ether_addr(dev->dev_addr)) { 570 memcpy(dev->dev_addr, 571 local->hw.wiphy->perm_addr, 572 ETH_ALEN); 573 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN); 574 575 if (!is_valid_ether_addr(dev->dev_addr)) { 576 res = -EADDRNOTAVAIL; 577 goto err_stop; 578 } 579 } 580 581 switch (sdata->vif.type) { 582 case NL80211_IFTYPE_AP_VLAN: 583 /* no need to tell driver, but set carrier and chanctx */ 584 if (rtnl_dereference(sdata->bss->beacon)) { 585 ieee80211_vif_vlan_copy_chanctx(sdata); 586 netif_carrier_on(dev); 587 } else { 588 netif_carrier_off(dev); 589 } 590 break; 591 case NL80211_IFTYPE_MONITOR: 592 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) { 593 local->cooked_mntrs++; 594 break; 595 } 596 597 if (sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE) { 598 res = drv_add_interface(local, sdata); 599 if (res) 600 goto err_stop; 601 } else if (local->monitors == 0 && local->open_count == 0) { 602 res = ieee80211_add_virtual_monitor(local); 603 if (res) 604 goto err_stop; 605 } 606 607 /* must be before the call to ieee80211_configure_filter */ 608 local->monitors++; 609 if (local->monitors == 1) { 610 local->hw.conf.flags |= IEEE80211_CONF_MONITOR; 611 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR; 612 } 613 614 ieee80211_adjust_monitor_flags(sdata, 1); 615 ieee80211_configure_filter(local); 616 mutex_lock(&local->mtx); 617 ieee80211_recalc_idle(local); 618 mutex_unlock(&local->mtx); 619 620 netif_carrier_on(dev); 621 break; 622 default: 623 if (coming_up) { 624 ieee80211_del_virtual_monitor(local); 625 626 res = drv_add_interface(local, sdata); 627 if (res) 628 goto err_stop; 629 res = ieee80211_check_queues(sdata, 630 ieee80211_vif_type_p2p(&sdata->vif)); 631 if (res) 632 goto err_del_interface; 633 } 634 635 if (sdata->vif.type == NL80211_IFTYPE_AP) { 636 local->fif_pspoll++; 637 local->fif_probe_req++; 638 639 ieee80211_configure_filter(local); 640 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 641 local->fif_probe_req++; 642 } 643 644 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) 645 changed |= ieee80211_reset_erp_info(sdata); 646 ieee80211_bss_info_change_notify(sdata, changed); 647 648 switch (sdata->vif.type) { 649 case NL80211_IFTYPE_STATION: 650 case NL80211_IFTYPE_ADHOC: 651 case NL80211_IFTYPE_AP: 652 case NL80211_IFTYPE_MESH_POINT: 653 case NL80211_IFTYPE_OCB: 654 netif_carrier_off(dev); 655 break; 656 case NL80211_IFTYPE_WDS: 657 case NL80211_IFTYPE_P2P_DEVICE: 658 break; 659 default: 660 /* not reached */ 661 WARN_ON(1); 662 } 663 664 /* 665 * Set default queue parameters so drivers don't 666 * need to initialise the hardware if the hardware 667 * doesn't start up with sane defaults. 668 * Enable QoS for anything but station interfaces. 669 */ 670 ieee80211_set_wmm_default(sdata, true, 671 sdata->vif.type != NL80211_IFTYPE_STATION); 672 } 673 674 set_bit(SDATA_STATE_RUNNING, &sdata->state); 675 676 if (sdata->vif.type == NL80211_IFTYPE_WDS) { 677 /* Create STA entry for the WDS peer */ 678 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr, 679 GFP_KERNEL); 680 if (!sta) { 681 res = -ENOMEM; 682 goto err_del_interface; 683 } 684 685 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH); 686 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC); 687 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED); 688 689 res = sta_info_insert(sta); 690 if (res) { 691 /* STA has been freed */ 692 goto err_del_interface; 693 } 694 695 rate_control_rate_init(sta); 696 netif_carrier_on(dev); 697 } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) { 698 rcu_assign_pointer(local->p2p_sdata, sdata); 699 } 700 701 /* 702 * set_multicast_list will be invoked by the networking core 703 * which will check whether any increments here were done in 704 * error and sync them down to the hardware as filter flags. 705 */ 706 if (sdata->flags & IEEE80211_SDATA_ALLMULTI) 707 atomic_inc(&local->iff_allmultis); 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); 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 } 761 762 static 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 } 777 778 static 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 allmulti while it is down */ 839 if (sdata->flags & IEEE80211_SDATA_ALLMULTI) 840 atomic_dec(&local->iff_allmultis); 841 842 if (sdata->vif.type == NL80211_IFTYPE_AP) { 843 local->fif_pspoll--; 844 local->fif_probe_req--; 845 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 846 local->fif_probe_req--; 847 } 848 849 if (sdata->dev) { 850 netif_addr_lock_bh(sdata->dev); 851 spin_lock_bh(&local->filter_lock); 852 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc, 853 sdata->dev->addr_len); 854 spin_unlock_bh(&local->filter_lock); 855 netif_addr_unlock_bh(sdata->dev); 856 } 857 858 del_timer_sync(&local->dynamic_ps_timer); 859 cancel_work_sync(&local->dynamic_ps_enable_work); 860 861 cancel_work_sync(&sdata->recalc_smps); 862 sdata_lock(sdata); 863 mutex_lock(&local->mtx); 864 sdata->vif.csa_active = false; 865 if (sdata->vif.type == NL80211_IFTYPE_STATION) 866 sdata->u.mgd.csa_waiting_bcn = false; 867 if (sdata->csa_block_tx) { 868 ieee80211_wake_vif_queues(local, sdata, 869 IEEE80211_QUEUE_STOP_REASON_CSA); 870 sdata->csa_block_tx = false; 871 } 872 mutex_unlock(&local->mtx); 873 sdata_unlock(sdata); 874 875 cancel_work_sync(&sdata->csa_finalize_work); 876 877 cancel_delayed_work_sync(&sdata->dfs_cac_timer_work); 878 879 if (sdata->wdev.cac_started) { 880 chandef = sdata->vif.bss_conf.chandef; 881 WARN_ON(local->suspended); 882 mutex_lock(&local->mtx); 883 ieee80211_vif_release_channel(sdata); 884 mutex_unlock(&local->mtx); 885 cfg80211_cac_event(sdata->dev, &chandef, 886 NL80211_RADAR_CAC_ABORTED, 887 GFP_KERNEL); 888 } 889 890 /* APs need special treatment */ 891 if (sdata->vif.type == NL80211_IFTYPE_AP) { 892 struct ieee80211_sub_if_data *vlan, *tmpsdata; 893 894 /* down all dependent devices, that is VLANs */ 895 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans, 896 u.vlan.list) 897 dev_close(vlan->dev); 898 WARN_ON(!list_empty(&sdata->u.ap.vlans)); 899 } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 900 /* remove all packets in parent bc_buf pointing to this dev */ 901 ps = &sdata->bss->ps; 902 903 spin_lock_irqsave(&ps->bc_buf.lock, flags); 904 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) { 905 if (skb->dev == sdata->dev) { 906 __skb_unlink(skb, &ps->bc_buf); 907 local->total_ps_buffered--; 908 ieee80211_free_txskb(&local->hw, skb); 909 } 910 } 911 spin_unlock_irqrestore(&ps->bc_buf.lock, flags); 912 } 913 914 if (going_down) 915 local->open_count--; 916 917 switch (sdata->vif.type) { 918 case NL80211_IFTYPE_AP_VLAN: 919 mutex_lock(&local->mtx); 920 list_del(&sdata->u.vlan.list); 921 mutex_unlock(&local->mtx); 922 RCU_INIT_POINTER(sdata->vif.chanctx_conf, NULL); 923 /* see comment in the default case below */ 924 ieee80211_free_keys(sdata, true); 925 /* no need to tell driver */ 926 break; 927 case NL80211_IFTYPE_MONITOR: 928 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) { 929 local->cooked_mntrs--; 930 break; 931 } 932 933 local->monitors--; 934 if (local->monitors == 0) { 935 local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR; 936 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR; 937 } 938 939 ieee80211_adjust_monitor_flags(sdata, -1); 940 break; 941 case NL80211_IFTYPE_P2P_DEVICE: 942 /* relies on synchronize_rcu() below */ 943 RCU_INIT_POINTER(local->p2p_sdata, NULL); 944 /* fall through */ 945 default: 946 cancel_work_sync(&sdata->work); 947 /* 948 * When we get here, the interface is marked down. 949 * Free the remaining keys, if there are any 950 * (which can happen in AP mode if userspace sets 951 * keys before the interface is operating, and maybe 952 * also in WDS mode) 953 * 954 * Force the key freeing to always synchronize_net() 955 * to wait for the RX path in case it is using this 956 * interface enqueuing frames at this very time on 957 * another CPU. 958 */ 959 ieee80211_free_keys(sdata, true); 960 skb_queue_purge(&sdata->skb_queue); 961 } 962 963 sdata->bss = NULL; 964 965 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 966 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) { 967 skb_queue_walk_safe(&local->pending[i], skb, tmp) { 968 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 969 if (info->control.vif == &sdata->vif) { 970 __skb_unlink(skb, &local->pending[i]); 971 ieee80211_free_txskb(&local->hw, skb); 972 } 973 } 974 } 975 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 976 977 if (sdata->vif.txq) { 978 struct txq_info *txqi = to_txq_info(sdata->vif.txq); 979 980 spin_lock_bh(&txqi->queue.lock); 981 ieee80211_purge_tx_queue(&local->hw, &txqi->queue); 982 txqi->byte_cnt = 0; 983 spin_unlock_bh(&txqi->queue.lock); 984 985 atomic_set(&sdata->txqs_len[txqi->txq.ac], 0); 986 } 987 988 if (local->open_count == 0) 989 ieee80211_clear_tx_pending(local); 990 991 /* 992 * If the interface goes down while suspended, presumably because 993 * the device was unplugged and that happens before our resume, 994 * then the driver is already unconfigured and the remainder of 995 * this function isn't needed. 996 * XXX: what about WoWLAN? If the device has software state, e.g. 997 * memory allocated, it might expect teardown commands from 998 * mac80211 here? 999 */ 1000 if (local->suspended) { 1001 WARN_ON(local->wowlan); 1002 WARN_ON(rtnl_dereference(local->monitor_sdata)); 1003 return; 1004 } 1005 1006 switch (sdata->vif.type) { 1007 case NL80211_IFTYPE_AP_VLAN: 1008 break; 1009 case NL80211_IFTYPE_MONITOR: 1010 if (local->monitors == 0) 1011 ieee80211_del_virtual_monitor(local); 1012 1013 mutex_lock(&local->mtx); 1014 ieee80211_recalc_idle(local); 1015 mutex_unlock(&local->mtx); 1016 1017 if (!(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE)) 1018 break; 1019 1020 /* fall through */ 1021 default: 1022 if (going_down) 1023 drv_remove_interface(local, sdata); 1024 } 1025 1026 ieee80211_recalc_ps(local); 1027 1028 if (cancel_scan) 1029 flush_delayed_work(&local->scan_work); 1030 1031 if (local->open_count == 0) { 1032 ieee80211_stop_device(local); 1033 1034 /* no reconfiguring after stop! */ 1035 return; 1036 } 1037 1038 /* do after stop to avoid reconfiguring when we stop anyway */ 1039 ieee80211_configure_filter(local); 1040 ieee80211_hw_config(local, hw_reconf_flags); 1041 1042 if (local->monitors == local->open_count) 1043 ieee80211_add_virtual_monitor(local); 1044 } 1045 1046 static int ieee80211_stop(struct net_device *dev) 1047 { 1048 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1049 1050 ieee80211_do_stop(sdata, true); 1051 1052 return 0; 1053 } 1054 1055 static void ieee80211_set_multicast_list(struct net_device *dev) 1056 { 1057 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1058 struct ieee80211_local *local = sdata->local; 1059 int allmulti, sdata_allmulti; 1060 1061 allmulti = !!(dev->flags & IFF_ALLMULTI); 1062 sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI); 1063 1064 if (allmulti != sdata_allmulti) { 1065 if (dev->flags & IFF_ALLMULTI) 1066 atomic_inc(&local->iff_allmultis); 1067 else 1068 atomic_dec(&local->iff_allmultis); 1069 sdata->flags ^= IEEE80211_SDATA_ALLMULTI; 1070 } 1071 1072 spin_lock_bh(&local->filter_lock); 1073 __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len); 1074 spin_unlock_bh(&local->filter_lock); 1075 ieee80211_queue_work(&local->hw, &local->reconfig_filter); 1076 } 1077 1078 /* 1079 * Called when the netdev is removed or, by the code below, before 1080 * the interface type changes. 1081 */ 1082 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata) 1083 { 1084 int i; 1085 1086 /* free extra data */ 1087 ieee80211_free_keys(sdata, false); 1088 1089 ieee80211_debugfs_remove_netdev(sdata); 1090 1091 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) 1092 __skb_queue_purge(&sdata->fragments[i].skb_list); 1093 sdata->fragment_next = 0; 1094 1095 if (ieee80211_vif_is_mesh(&sdata->vif)) 1096 ieee80211_mesh_teardown_sdata(sdata); 1097 } 1098 1099 static void ieee80211_uninit(struct net_device *dev) 1100 { 1101 ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev)); 1102 } 1103 1104 static u16 ieee80211_netdev_select_queue(struct net_device *dev, 1105 struct sk_buff *skb, 1106 void *accel_priv, 1107 select_queue_fallback_t fallback) 1108 { 1109 return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb); 1110 } 1111 1112 static struct rtnl_link_stats64 * 1113 ieee80211_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats) 1114 { 1115 int i; 1116 1117 for_each_possible_cpu(i) { 1118 const struct pcpu_sw_netstats *tstats; 1119 u64 rx_packets, rx_bytes, tx_packets, tx_bytes; 1120 unsigned int start; 1121 1122 tstats = per_cpu_ptr(dev->tstats, i); 1123 1124 do { 1125 start = u64_stats_fetch_begin_irq(&tstats->syncp); 1126 rx_packets = tstats->rx_packets; 1127 tx_packets = tstats->tx_packets; 1128 rx_bytes = tstats->rx_bytes; 1129 tx_bytes = tstats->tx_bytes; 1130 } while (u64_stats_fetch_retry_irq(&tstats->syncp, start)); 1131 1132 stats->rx_packets += rx_packets; 1133 stats->tx_packets += tx_packets; 1134 stats->rx_bytes += rx_bytes; 1135 stats->tx_bytes += tx_bytes; 1136 } 1137 1138 return stats; 1139 } 1140 1141 static const struct net_device_ops ieee80211_dataif_ops = { 1142 .ndo_open = ieee80211_open, 1143 .ndo_stop = ieee80211_stop, 1144 .ndo_uninit = ieee80211_uninit, 1145 .ndo_start_xmit = ieee80211_subif_start_xmit, 1146 .ndo_set_rx_mode = ieee80211_set_multicast_list, 1147 .ndo_change_mtu = ieee80211_change_mtu, 1148 .ndo_set_mac_address = ieee80211_change_mac, 1149 .ndo_select_queue = ieee80211_netdev_select_queue, 1150 .ndo_get_stats64 = ieee80211_get_stats64, 1151 }; 1152 1153 static u16 ieee80211_monitor_select_queue(struct net_device *dev, 1154 struct sk_buff *skb, 1155 void *accel_priv, 1156 select_queue_fallback_t fallback) 1157 { 1158 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1159 struct ieee80211_local *local = sdata->local; 1160 struct ieee80211_hdr *hdr; 1161 struct ieee80211_radiotap_header *rtap = (void *)skb->data; 1162 1163 if (local->hw.queues < IEEE80211_NUM_ACS) 1164 return 0; 1165 1166 if (skb->len < 4 || 1167 skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */) 1168 return 0; /* doesn't matter, frame will be dropped */ 1169 1170 hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len)); 1171 1172 return ieee80211_select_queue_80211(sdata, skb, hdr); 1173 } 1174 1175 static const struct net_device_ops ieee80211_monitorif_ops = { 1176 .ndo_open = ieee80211_open, 1177 .ndo_stop = ieee80211_stop, 1178 .ndo_uninit = ieee80211_uninit, 1179 .ndo_start_xmit = ieee80211_monitor_start_xmit, 1180 .ndo_set_rx_mode = ieee80211_set_multicast_list, 1181 .ndo_change_mtu = ieee80211_change_mtu, 1182 .ndo_set_mac_address = ieee80211_change_mac, 1183 .ndo_select_queue = ieee80211_monitor_select_queue, 1184 .ndo_get_stats64 = ieee80211_get_stats64, 1185 }; 1186 1187 static void ieee80211_if_free(struct net_device *dev) 1188 { 1189 free_percpu(dev->tstats); 1190 free_netdev(dev); 1191 } 1192 1193 static void ieee80211_if_setup(struct net_device *dev) 1194 { 1195 ether_setup(dev); 1196 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1197 dev->netdev_ops = &ieee80211_dataif_ops; 1198 dev->destructor = ieee80211_if_free; 1199 } 1200 1201 static void ieee80211_iface_work(struct work_struct *work) 1202 { 1203 struct ieee80211_sub_if_data *sdata = 1204 container_of(work, struct ieee80211_sub_if_data, work); 1205 struct ieee80211_local *local = sdata->local; 1206 struct sk_buff *skb; 1207 struct sta_info *sta; 1208 struct ieee80211_ra_tid *ra_tid; 1209 struct ieee80211_rx_agg *rx_agg; 1210 1211 if (!ieee80211_sdata_running(sdata)) 1212 return; 1213 1214 if (test_bit(SCAN_SW_SCANNING, &local->scanning)) 1215 return; 1216 1217 if (!ieee80211_can_run_worker(local)) 1218 return; 1219 1220 /* first process frames */ 1221 while ((skb = skb_dequeue(&sdata->skb_queue))) { 1222 struct ieee80211_mgmt *mgmt = (void *)skb->data; 1223 1224 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) { 1225 ra_tid = (void *)&skb->cb; 1226 ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra, 1227 ra_tid->tid); 1228 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) { 1229 ra_tid = (void *)&skb->cb; 1230 ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra, 1231 ra_tid->tid); 1232 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_RX_AGG_START) { 1233 rx_agg = (void *)&skb->cb; 1234 mutex_lock(&local->sta_mtx); 1235 sta = sta_info_get_bss(sdata, rx_agg->addr); 1236 if (sta) 1237 __ieee80211_start_rx_ba_session(sta, 1238 0, 0, 0, 1, rx_agg->tid, 1239 IEEE80211_MAX_AMPDU_BUF, 1240 false, true); 1241 mutex_unlock(&local->sta_mtx); 1242 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_RX_AGG_STOP) { 1243 rx_agg = (void *)&skb->cb; 1244 mutex_lock(&local->sta_mtx); 1245 sta = sta_info_get_bss(sdata, rx_agg->addr); 1246 if (sta) 1247 __ieee80211_stop_rx_ba_session(sta, 1248 rx_agg->tid, 1249 WLAN_BACK_RECIPIENT, 0, 1250 false); 1251 mutex_unlock(&local->sta_mtx); 1252 } else if (ieee80211_is_action(mgmt->frame_control) && 1253 mgmt->u.action.category == WLAN_CATEGORY_BACK) { 1254 int len = skb->len; 1255 1256 mutex_lock(&local->sta_mtx); 1257 sta = sta_info_get_bss(sdata, mgmt->sa); 1258 if (sta) { 1259 switch (mgmt->u.action.u.addba_req.action_code) { 1260 case WLAN_ACTION_ADDBA_REQ: 1261 ieee80211_process_addba_request( 1262 local, sta, mgmt, len); 1263 break; 1264 case WLAN_ACTION_ADDBA_RESP: 1265 ieee80211_process_addba_resp(local, sta, 1266 mgmt, len); 1267 break; 1268 case WLAN_ACTION_DELBA: 1269 ieee80211_process_delba(sdata, sta, 1270 mgmt, len); 1271 break; 1272 default: 1273 WARN_ON(1); 1274 break; 1275 } 1276 } 1277 mutex_unlock(&local->sta_mtx); 1278 } else if (ieee80211_is_action(mgmt->frame_control) && 1279 mgmt->u.action.category == WLAN_CATEGORY_VHT) { 1280 switch (mgmt->u.action.u.vht_group_notif.action_code) { 1281 case WLAN_VHT_ACTION_GROUPID_MGMT: 1282 ieee80211_process_mu_groups(sdata, mgmt); 1283 break; 1284 default: 1285 WARN_ON(1); 1286 break; 1287 } 1288 } else if (ieee80211_is_data_qos(mgmt->frame_control)) { 1289 struct ieee80211_hdr *hdr = (void *)mgmt; 1290 /* 1291 * So the frame isn't mgmt, but frame_control 1292 * is at the right place anyway, of course, so 1293 * the if statement is correct. 1294 * 1295 * Warn if we have other data frame types here, 1296 * they must not get here. 1297 */ 1298 WARN_ON(hdr->frame_control & 1299 cpu_to_le16(IEEE80211_STYPE_NULLFUNC)); 1300 WARN_ON(!(hdr->seq_ctrl & 1301 cpu_to_le16(IEEE80211_SCTL_FRAG))); 1302 /* 1303 * This was a fragment of a frame, received while 1304 * a block-ack session was active. That cannot be 1305 * right, so terminate the session. 1306 */ 1307 mutex_lock(&local->sta_mtx); 1308 sta = sta_info_get_bss(sdata, mgmt->sa); 1309 if (sta) { 1310 u16 tid = *ieee80211_get_qos_ctl(hdr) & 1311 IEEE80211_QOS_CTL_TID_MASK; 1312 1313 __ieee80211_stop_rx_ba_session( 1314 sta, tid, WLAN_BACK_RECIPIENT, 1315 WLAN_REASON_QSTA_REQUIRE_SETUP, 1316 true); 1317 } 1318 mutex_unlock(&local->sta_mtx); 1319 } else switch (sdata->vif.type) { 1320 case NL80211_IFTYPE_STATION: 1321 ieee80211_sta_rx_queued_mgmt(sdata, skb); 1322 break; 1323 case NL80211_IFTYPE_ADHOC: 1324 ieee80211_ibss_rx_queued_mgmt(sdata, skb); 1325 break; 1326 case NL80211_IFTYPE_MESH_POINT: 1327 if (!ieee80211_vif_is_mesh(&sdata->vif)) 1328 break; 1329 ieee80211_mesh_rx_queued_mgmt(sdata, skb); 1330 break; 1331 default: 1332 WARN(1, "frame for unexpected interface type"); 1333 break; 1334 } 1335 1336 kfree_skb(skb); 1337 } 1338 1339 /* then other type-dependent work */ 1340 switch (sdata->vif.type) { 1341 case NL80211_IFTYPE_STATION: 1342 ieee80211_sta_work(sdata); 1343 break; 1344 case NL80211_IFTYPE_ADHOC: 1345 ieee80211_ibss_work(sdata); 1346 break; 1347 case NL80211_IFTYPE_MESH_POINT: 1348 if (!ieee80211_vif_is_mesh(&sdata->vif)) 1349 break; 1350 ieee80211_mesh_work(sdata); 1351 break; 1352 case NL80211_IFTYPE_OCB: 1353 ieee80211_ocb_work(sdata); 1354 break; 1355 default: 1356 break; 1357 } 1358 } 1359 1360 static void ieee80211_recalc_smps_work(struct work_struct *work) 1361 { 1362 struct ieee80211_sub_if_data *sdata = 1363 container_of(work, struct ieee80211_sub_if_data, recalc_smps); 1364 1365 ieee80211_recalc_smps(sdata); 1366 } 1367 1368 /* 1369 * Helper function to initialise an interface to a specific type. 1370 */ 1371 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata, 1372 enum nl80211_iftype type) 1373 { 1374 static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff, 1375 0xff, 0xff, 0xff}; 1376 1377 /* clear type-dependent union */ 1378 memset(&sdata->u, 0, sizeof(sdata->u)); 1379 1380 /* and set some type-dependent values */ 1381 sdata->vif.type = type; 1382 sdata->vif.p2p = false; 1383 sdata->wdev.iftype = type; 1384 1385 sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE); 1386 sdata->control_port_no_encrypt = false; 1387 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM; 1388 sdata->vif.bss_conf.idle = true; 1389 1390 sdata->noack_map = 0; 1391 1392 /* only monitor/p2p-device differ */ 1393 if (sdata->dev) { 1394 sdata->dev->netdev_ops = &ieee80211_dataif_ops; 1395 sdata->dev->type = ARPHRD_ETHER; 1396 } 1397 1398 skb_queue_head_init(&sdata->skb_queue); 1399 INIT_WORK(&sdata->work, ieee80211_iface_work); 1400 INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work); 1401 INIT_WORK(&sdata->csa_finalize_work, ieee80211_csa_finalize_work); 1402 INIT_LIST_HEAD(&sdata->assigned_chanctx_list); 1403 INIT_LIST_HEAD(&sdata->reserved_chanctx_list); 1404 1405 switch (type) { 1406 case NL80211_IFTYPE_P2P_GO: 1407 type = NL80211_IFTYPE_AP; 1408 sdata->vif.type = type; 1409 sdata->vif.p2p = true; 1410 /* fall through */ 1411 case NL80211_IFTYPE_AP: 1412 skb_queue_head_init(&sdata->u.ap.ps.bc_buf); 1413 INIT_LIST_HEAD(&sdata->u.ap.vlans); 1414 INIT_WORK(&sdata->u.ap.request_smps_work, 1415 ieee80211_request_smps_ap_work); 1416 sdata->vif.bss_conf.bssid = sdata->vif.addr; 1417 sdata->u.ap.req_smps = IEEE80211_SMPS_OFF; 1418 break; 1419 case NL80211_IFTYPE_P2P_CLIENT: 1420 type = NL80211_IFTYPE_STATION; 1421 sdata->vif.type = type; 1422 sdata->vif.p2p = true; 1423 /* fall through */ 1424 case NL80211_IFTYPE_STATION: 1425 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid; 1426 ieee80211_sta_setup_sdata(sdata); 1427 break; 1428 case NL80211_IFTYPE_OCB: 1429 sdata->vif.bss_conf.bssid = bssid_wildcard; 1430 ieee80211_ocb_setup_sdata(sdata); 1431 break; 1432 case NL80211_IFTYPE_ADHOC: 1433 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid; 1434 ieee80211_ibss_setup_sdata(sdata); 1435 break; 1436 case NL80211_IFTYPE_MESH_POINT: 1437 if (ieee80211_vif_is_mesh(&sdata->vif)) 1438 ieee80211_mesh_init_sdata(sdata); 1439 break; 1440 case NL80211_IFTYPE_MONITOR: 1441 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP; 1442 sdata->dev->netdev_ops = &ieee80211_monitorif_ops; 1443 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL | 1444 MONITOR_FLAG_OTHER_BSS; 1445 break; 1446 case NL80211_IFTYPE_WDS: 1447 sdata->vif.bss_conf.bssid = NULL; 1448 break; 1449 case NL80211_IFTYPE_AP_VLAN: 1450 case NL80211_IFTYPE_P2P_DEVICE: 1451 sdata->vif.bss_conf.bssid = sdata->vif.addr; 1452 break; 1453 case NL80211_IFTYPE_UNSPECIFIED: 1454 case NUM_NL80211_IFTYPES: 1455 BUG(); 1456 break; 1457 } 1458 1459 ieee80211_debugfs_add_netdev(sdata); 1460 } 1461 1462 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata, 1463 enum nl80211_iftype type) 1464 { 1465 struct ieee80211_local *local = sdata->local; 1466 int ret, err; 1467 enum nl80211_iftype internal_type = type; 1468 bool p2p = false; 1469 1470 ASSERT_RTNL(); 1471 1472 if (!local->ops->change_interface) 1473 return -EBUSY; 1474 1475 switch (sdata->vif.type) { 1476 case NL80211_IFTYPE_AP: 1477 case NL80211_IFTYPE_STATION: 1478 case NL80211_IFTYPE_ADHOC: 1479 case NL80211_IFTYPE_OCB: 1480 /* 1481 * Could maybe also all others here? 1482 * Just not sure how that interacts 1483 * with the RX/config path e.g. for 1484 * mesh. 1485 */ 1486 break; 1487 default: 1488 return -EBUSY; 1489 } 1490 1491 switch (type) { 1492 case NL80211_IFTYPE_AP: 1493 case NL80211_IFTYPE_STATION: 1494 case NL80211_IFTYPE_ADHOC: 1495 case NL80211_IFTYPE_OCB: 1496 /* 1497 * Could probably support everything 1498 * but WDS here (WDS do_open can fail 1499 * under memory pressure, which this 1500 * code isn't prepared to handle). 1501 */ 1502 break; 1503 case NL80211_IFTYPE_P2P_CLIENT: 1504 p2p = true; 1505 internal_type = NL80211_IFTYPE_STATION; 1506 break; 1507 case NL80211_IFTYPE_P2P_GO: 1508 p2p = true; 1509 internal_type = NL80211_IFTYPE_AP; 1510 break; 1511 default: 1512 return -EBUSY; 1513 } 1514 1515 ret = ieee80211_check_concurrent_iface(sdata, internal_type); 1516 if (ret) 1517 return ret; 1518 1519 ieee80211_do_stop(sdata, false); 1520 1521 ieee80211_teardown_sdata(sdata); 1522 1523 ret = drv_change_interface(local, sdata, internal_type, p2p); 1524 if (ret) 1525 type = ieee80211_vif_type_p2p(&sdata->vif); 1526 1527 /* 1528 * Ignore return value here, there's not much we can do since 1529 * the driver changed the interface type internally already. 1530 * The warnings will hopefully make driver authors fix it :-) 1531 */ 1532 ieee80211_check_queues(sdata, type); 1533 1534 ieee80211_setup_sdata(sdata, type); 1535 1536 err = ieee80211_do_open(&sdata->wdev, false); 1537 WARN(err, "type change: do_open returned %d", err); 1538 1539 return ret; 1540 } 1541 1542 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata, 1543 enum nl80211_iftype type) 1544 { 1545 int ret; 1546 1547 ASSERT_RTNL(); 1548 1549 if (type == ieee80211_vif_type_p2p(&sdata->vif)) 1550 return 0; 1551 1552 if (ieee80211_sdata_running(sdata)) { 1553 ret = ieee80211_runtime_change_iftype(sdata, type); 1554 if (ret) 1555 return ret; 1556 } else { 1557 /* Purge and reset type-dependent state. */ 1558 ieee80211_teardown_sdata(sdata); 1559 ieee80211_setup_sdata(sdata, type); 1560 } 1561 1562 /* reset some values that shouldn't be kept across type changes */ 1563 if (type == NL80211_IFTYPE_STATION) 1564 sdata->u.mgd.use_4addr = false; 1565 1566 return 0; 1567 } 1568 1569 static void ieee80211_assign_perm_addr(struct ieee80211_local *local, 1570 u8 *perm_addr, enum nl80211_iftype type) 1571 { 1572 struct ieee80211_sub_if_data *sdata; 1573 u64 mask, start, addr, val, inc; 1574 u8 *m; 1575 u8 tmp_addr[ETH_ALEN]; 1576 int i; 1577 1578 /* default ... something at least */ 1579 memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN); 1580 1581 if (is_zero_ether_addr(local->hw.wiphy->addr_mask) && 1582 local->hw.wiphy->n_addresses <= 1) 1583 return; 1584 1585 mutex_lock(&local->iflist_mtx); 1586 1587 switch (type) { 1588 case NL80211_IFTYPE_MONITOR: 1589 /* doesn't matter */ 1590 break; 1591 case NL80211_IFTYPE_WDS: 1592 case NL80211_IFTYPE_AP_VLAN: 1593 /* match up with an AP interface */ 1594 list_for_each_entry(sdata, &local->interfaces, list) { 1595 if (sdata->vif.type != NL80211_IFTYPE_AP) 1596 continue; 1597 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN); 1598 break; 1599 } 1600 /* keep default if no AP interface present */ 1601 break; 1602 case NL80211_IFTYPE_P2P_CLIENT: 1603 case NL80211_IFTYPE_P2P_GO: 1604 if (ieee80211_hw_check(&local->hw, P2P_DEV_ADDR_FOR_INTF)) { 1605 list_for_each_entry(sdata, &local->interfaces, list) { 1606 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) 1607 continue; 1608 if (!ieee80211_sdata_running(sdata)) 1609 continue; 1610 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN); 1611 goto out_unlock; 1612 } 1613 } 1614 /* otherwise fall through */ 1615 default: 1616 /* assign a new address if possible -- try n_addresses first */ 1617 for (i = 0; i < local->hw.wiphy->n_addresses; i++) { 1618 bool used = false; 1619 1620 list_for_each_entry(sdata, &local->interfaces, list) { 1621 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr, 1622 sdata->vif.addr)) { 1623 used = true; 1624 break; 1625 } 1626 } 1627 1628 if (!used) { 1629 memcpy(perm_addr, 1630 local->hw.wiphy->addresses[i].addr, 1631 ETH_ALEN); 1632 break; 1633 } 1634 } 1635 1636 /* try mask if available */ 1637 if (is_zero_ether_addr(local->hw.wiphy->addr_mask)) 1638 break; 1639 1640 m = local->hw.wiphy->addr_mask; 1641 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 1642 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 1643 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 1644 1645 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) { 1646 /* not a contiguous mask ... not handled now! */ 1647 pr_info("not contiguous\n"); 1648 break; 1649 } 1650 1651 /* 1652 * Pick address of existing interface in case user changed 1653 * MAC address manually, default to perm_addr. 1654 */ 1655 m = local->hw.wiphy->perm_addr; 1656 list_for_each_entry(sdata, &local->interfaces, list) { 1657 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) 1658 continue; 1659 m = sdata->vif.addr; 1660 break; 1661 } 1662 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 1663 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 1664 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 1665 1666 inc = 1ULL<<__ffs64(mask); 1667 val = (start & mask); 1668 addr = (start & ~mask) | (val & mask); 1669 do { 1670 bool used = false; 1671 1672 tmp_addr[5] = addr >> 0*8; 1673 tmp_addr[4] = addr >> 1*8; 1674 tmp_addr[3] = addr >> 2*8; 1675 tmp_addr[2] = addr >> 3*8; 1676 tmp_addr[1] = addr >> 4*8; 1677 tmp_addr[0] = addr >> 5*8; 1678 1679 val += inc; 1680 1681 list_for_each_entry(sdata, &local->interfaces, list) { 1682 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) { 1683 used = true; 1684 break; 1685 } 1686 } 1687 1688 if (!used) { 1689 memcpy(perm_addr, tmp_addr, ETH_ALEN); 1690 break; 1691 } 1692 addr = (start & ~mask) | (val & mask); 1693 } while (addr != start); 1694 1695 break; 1696 } 1697 1698 out_unlock: 1699 mutex_unlock(&local->iflist_mtx); 1700 } 1701 1702 int ieee80211_if_add(struct ieee80211_local *local, const char *name, 1703 unsigned char name_assign_type, 1704 struct wireless_dev **new_wdev, enum nl80211_iftype type, 1705 struct vif_params *params) 1706 { 1707 struct net_device *ndev = NULL; 1708 struct ieee80211_sub_if_data *sdata = NULL; 1709 struct txq_info *txqi; 1710 int ret, i; 1711 int txqs = 1; 1712 1713 ASSERT_RTNL(); 1714 1715 if (type == NL80211_IFTYPE_P2P_DEVICE) { 1716 struct wireless_dev *wdev; 1717 1718 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, 1719 GFP_KERNEL); 1720 if (!sdata) 1721 return -ENOMEM; 1722 wdev = &sdata->wdev; 1723 1724 sdata->dev = NULL; 1725 strlcpy(sdata->name, name, IFNAMSIZ); 1726 ieee80211_assign_perm_addr(local, wdev->address, type); 1727 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN); 1728 } else { 1729 int size = ALIGN(sizeof(*sdata) + local->hw.vif_data_size, 1730 sizeof(void *)); 1731 int txq_size = 0; 1732 1733 if (local->ops->wake_tx_queue) 1734 txq_size += sizeof(struct txq_info) + 1735 local->hw.txq_data_size; 1736 1737 if (local->hw.queues >= IEEE80211_NUM_ACS) 1738 txqs = IEEE80211_NUM_ACS; 1739 1740 ndev = alloc_netdev_mqs(size + txq_size, 1741 name, name_assign_type, 1742 ieee80211_if_setup, txqs, 1); 1743 if (!ndev) 1744 return -ENOMEM; 1745 dev_net_set(ndev, wiphy_net(local->hw.wiphy)); 1746 1747 ndev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 1748 if (!ndev->tstats) { 1749 free_netdev(ndev); 1750 return -ENOMEM; 1751 } 1752 1753 ndev->needed_headroom = local->tx_headroom + 1754 4*6 /* four MAC addresses */ 1755 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */ 1756 + 6 /* mesh */ 1757 + 8 /* rfc1042/bridge tunnel */ 1758 - ETH_HLEN /* ethernet hard_header_len */ 1759 + IEEE80211_ENCRYPT_HEADROOM; 1760 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM; 1761 1762 ret = dev_alloc_name(ndev, ndev->name); 1763 if (ret < 0) { 1764 ieee80211_if_free(ndev); 1765 return ret; 1766 } 1767 1768 ieee80211_assign_perm_addr(local, ndev->perm_addr, type); 1769 if (params && is_valid_ether_addr(params->macaddr)) 1770 memcpy(ndev->dev_addr, params->macaddr, ETH_ALEN); 1771 else 1772 memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN); 1773 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy)); 1774 1775 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */ 1776 sdata = netdev_priv(ndev); 1777 ndev->ieee80211_ptr = &sdata->wdev; 1778 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN); 1779 memcpy(sdata->name, ndev->name, IFNAMSIZ); 1780 1781 if (txq_size) { 1782 txqi = netdev_priv(ndev) + size; 1783 ieee80211_init_tx_queue(sdata, NULL, txqi, 0); 1784 } 1785 1786 sdata->dev = ndev; 1787 } 1788 1789 /* initialise type-independent data */ 1790 sdata->wdev.wiphy = local->hw.wiphy; 1791 sdata->local = local; 1792 1793 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) 1794 skb_queue_head_init(&sdata->fragments[i].skb_list); 1795 1796 INIT_LIST_HEAD(&sdata->key_list); 1797 1798 INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work, 1799 ieee80211_dfs_cac_timer_work); 1800 INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk, 1801 ieee80211_delayed_tailroom_dec); 1802 1803 for (i = 0; i < NUM_NL80211_BANDS; i++) { 1804 struct ieee80211_supported_band *sband; 1805 sband = local->hw.wiphy->bands[i]; 1806 sdata->rc_rateidx_mask[i] = 1807 sband ? (1 << sband->n_bitrates) - 1 : 0; 1808 if (sband) { 1809 __le16 cap; 1810 u16 *vht_rate_mask; 1811 1812 memcpy(sdata->rc_rateidx_mcs_mask[i], 1813 sband->ht_cap.mcs.rx_mask, 1814 sizeof(sdata->rc_rateidx_mcs_mask[i])); 1815 1816 cap = sband->vht_cap.vht_mcs.rx_mcs_map; 1817 vht_rate_mask = sdata->rc_rateidx_vht_mcs_mask[i]; 1818 ieee80211_get_vht_mask_from_cap(cap, vht_rate_mask); 1819 } else { 1820 memset(sdata->rc_rateidx_mcs_mask[i], 0, 1821 sizeof(sdata->rc_rateidx_mcs_mask[i])); 1822 memset(sdata->rc_rateidx_vht_mcs_mask[i], 0, 1823 sizeof(sdata->rc_rateidx_vht_mcs_mask[i])); 1824 } 1825 } 1826 1827 ieee80211_set_default_queues(sdata); 1828 1829 sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL; 1830 sdata->user_power_level = local->user_power_level; 1831 1832 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM; 1833 1834 /* setup type-dependent data */ 1835 ieee80211_setup_sdata(sdata, type); 1836 1837 if (ndev) { 1838 if (params) { 1839 ndev->ieee80211_ptr->use_4addr = params->use_4addr; 1840 if (type == NL80211_IFTYPE_STATION) 1841 sdata->u.mgd.use_4addr = params->use_4addr; 1842 } 1843 1844 ndev->features |= local->hw.netdev_features; 1845 1846 netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops); 1847 1848 ret = register_netdevice(ndev); 1849 if (ret) { 1850 ieee80211_if_free(ndev); 1851 return ret; 1852 } 1853 } 1854 1855 mutex_lock(&local->iflist_mtx); 1856 list_add_tail_rcu(&sdata->list, &local->interfaces); 1857 mutex_unlock(&local->iflist_mtx); 1858 1859 if (new_wdev) 1860 *new_wdev = &sdata->wdev; 1861 1862 return 0; 1863 } 1864 1865 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata) 1866 { 1867 ASSERT_RTNL(); 1868 1869 mutex_lock(&sdata->local->iflist_mtx); 1870 list_del_rcu(&sdata->list); 1871 mutex_unlock(&sdata->local->iflist_mtx); 1872 1873 synchronize_rcu(); 1874 1875 if (sdata->dev) { 1876 unregister_netdevice(sdata->dev); 1877 } else { 1878 cfg80211_unregister_wdev(&sdata->wdev); 1879 ieee80211_teardown_sdata(sdata); 1880 kfree(sdata); 1881 } 1882 } 1883 1884 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata) 1885 { 1886 if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state))) 1887 return; 1888 ieee80211_do_stop(sdata, true); 1889 } 1890 1891 void ieee80211_remove_interfaces(struct ieee80211_local *local) 1892 { 1893 struct ieee80211_sub_if_data *sdata, *tmp; 1894 LIST_HEAD(unreg_list); 1895 LIST_HEAD(wdev_list); 1896 1897 ASSERT_RTNL(); 1898 1899 /* Before destroying the interfaces, make sure they're all stopped so 1900 * that the hardware is stopped. Otherwise, the driver might still be 1901 * iterating the interfaces during the shutdown, e.g. from a worker 1902 * or from RX processing or similar, and if it does so (using atomic 1903 * iteration) while we're manipulating the list, the iteration will 1904 * crash. 1905 * 1906 * After this, the hardware should be stopped and the driver should 1907 * have stopped all of its activities, so that we can do RCU-unaware 1908 * manipulations of the interface list below. 1909 */ 1910 cfg80211_shutdown_all_interfaces(local->hw.wiphy); 1911 1912 WARN(local->open_count, "%s: open count remains %d\n", 1913 wiphy_name(local->hw.wiphy), local->open_count); 1914 1915 mutex_lock(&local->iflist_mtx); 1916 list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) { 1917 list_del(&sdata->list); 1918 1919 if (sdata->dev) 1920 unregister_netdevice_queue(sdata->dev, &unreg_list); 1921 else 1922 list_add(&sdata->list, &wdev_list); 1923 } 1924 mutex_unlock(&local->iflist_mtx); 1925 unregister_netdevice_many(&unreg_list); 1926 1927 list_for_each_entry_safe(sdata, tmp, &wdev_list, list) { 1928 list_del(&sdata->list); 1929 cfg80211_unregister_wdev(&sdata->wdev); 1930 kfree(sdata); 1931 } 1932 } 1933 1934 static int netdev_notify(struct notifier_block *nb, 1935 unsigned long state, void *ptr) 1936 { 1937 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 1938 struct ieee80211_sub_if_data *sdata; 1939 1940 if (state != NETDEV_CHANGENAME) 1941 return NOTIFY_DONE; 1942 1943 if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy) 1944 return NOTIFY_DONE; 1945 1946 if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid) 1947 return NOTIFY_DONE; 1948 1949 sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1950 memcpy(sdata->name, dev->name, IFNAMSIZ); 1951 ieee80211_debugfs_rename_netdev(sdata); 1952 1953 return NOTIFY_OK; 1954 } 1955 1956 static struct notifier_block mac80211_netdev_notifier = { 1957 .notifier_call = netdev_notify, 1958 }; 1959 1960 int ieee80211_iface_init(void) 1961 { 1962 return register_netdevice_notifier(&mac80211_netdev_notifier); 1963 } 1964 1965 void ieee80211_iface_exit(void) 1966 { 1967 unregister_netdevice_notifier(&mac80211_netdev_notifier); 1968 } 1969