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) || update_bss) 80 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_TXPOWER); 81 } 82 83 static 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 92 static 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 } 102 103 static 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 } 137 138 u32 ieee80211_idle_off(struct ieee80211_local *local) 139 { 140 return __ieee80211_recalc_idle(local, true); 141 } 142 143 void 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 } 149 150 static 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 } 158 159 static 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 } 207 208 static 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 } 233 234 static 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 } 249 250 static 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 } 320 321 static 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 !ieee80211_hw_check(&sdata->local->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 } 354 355 void 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 } 374 375 static 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 (ieee80211_hw_check(&local->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 } 390 391 int ieee80211_add_virtual_monitor(struct ieee80211_local *local) 392 { 393 struct ieee80211_sub_if_data *sdata; 394 int ret; 395 396 if (!ieee80211_hw_check(&local->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 } 452 453 void ieee80211_del_virtual_monitor(struct ieee80211_local *local) 454 { 455 struct ieee80211_sub_if_data *sdata; 456 457 if (!ieee80211_hw_check(&local->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 */ 490 int 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 (coming_up) 707 local->open_count++; 708 709 if (hw_reconf_flags) 710 ieee80211_hw_config(local, hw_reconf_flags); 711 712 ieee80211_recalc_ps(local, -1); 713 714 if (sdata->vif.type == NL80211_IFTYPE_MONITOR || 715 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 716 /* XXX: for AP_VLAN, actually track AP queues */ 717 netif_tx_start_all_queues(dev); 718 } else if (dev) { 719 unsigned long flags; 720 int n_acs = IEEE80211_NUM_ACS; 721 int ac; 722 723 if (local->hw.queues < IEEE80211_NUM_ACS) 724 n_acs = 1; 725 726 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 727 if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE || 728 (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 && 729 skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) { 730 for (ac = 0; ac < n_acs; ac++) { 731 int ac_queue = sdata->vif.hw_queue[ac]; 732 733 if (local->queue_stop_reasons[ac_queue] == 0 && 734 skb_queue_empty(&local->pending[ac_queue])) 735 netif_start_subqueue(dev, ac); 736 } 737 } 738 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 739 } 740 741 return 0; 742 err_del_interface: 743 drv_remove_interface(local, sdata); 744 err_stop: 745 if (!local->open_count) 746 drv_stop(local); 747 err_del_bss: 748 sdata->bss = NULL; 749 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 750 mutex_lock(&local->mtx); 751 list_del(&sdata->u.vlan.list); 752 mutex_unlock(&local->mtx); 753 } 754 /* might already be clear but that doesn't matter */ 755 clear_bit(SDATA_STATE_RUNNING, &sdata->state); 756 return res; 757 } 758 759 static int ieee80211_open(struct net_device *dev) 760 { 761 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 762 int err; 763 764 /* fail early if user set an invalid address */ 765 if (!is_valid_ether_addr(dev->dev_addr)) 766 return -EADDRNOTAVAIL; 767 768 err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type); 769 if (err) 770 return err; 771 772 return ieee80211_do_open(&sdata->wdev, true); 773 } 774 775 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata, 776 bool going_down) 777 { 778 struct ieee80211_local *local = sdata->local; 779 unsigned long flags; 780 struct sk_buff *skb, *tmp; 781 u32 hw_reconf_flags = 0; 782 int i, flushed; 783 struct ps_data *ps; 784 struct cfg80211_chan_def chandef; 785 bool cancel_scan; 786 787 clear_bit(SDATA_STATE_RUNNING, &sdata->state); 788 789 cancel_scan = rcu_access_pointer(local->scan_sdata) == sdata; 790 if (cancel_scan) 791 ieee80211_scan_cancel(local); 792 793 /* 794 * Stop TX on this interface first. 795 */ 796 if (sdata->dev) 797 netif_tx_stop_all_queues(sdata->dev); 798 799 ieee80211_roc_purge(local, sdata); 800 801 switch (sdata->vif.type) { 802 case NL80211_IFTYPE_STATION: 803 ieee80211_mgd_stop(sdata); 804 break; 805 case NL80211_IFTYPE_ADHOC: 806 ieee80211_ibss_stop(sdata); 807 break; 808 case NL80211_IFTYPE_AP: 809 cancel_work_sync(&sdata->u.ap.request_smps_work); 810 break; 811 default: 812 break; 813 } 814 815 /* 816 * Remove all stations associated with this interface. 817 * 818 * This must be done before calling ops->remove_interface() 819 * because otherwise we can later invoke ops->sta_notify() 820 * whenever the STAs are removed, and that invalidates driver 821 * assumptions about always getting a vif pointer that is valid 822 * (because if we remove a STA after ops->remove_interface() 823 * the driver will have removed the vif info already!) 824 * 825 * In WDS mode a station must exist here and be flushed, for 826 * AP_VLANs stations may exist since there's nothing else that 827 * would have removed them, but in other modes there shouldn't 828 * be any stations. 829 */ 830 flushed = sta_info_flush(sdata); 831 WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_AP_VLAN && 832 ((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) || 833 (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1))); 834 835 /* don't count this interface for allmulti while it is down */ 836 if (sdata->flags & IEEE80211_SDATA_ALLMULTI) 837 atomic_dec(&local->iff_allmultis); 838 839 if (sdata->vif.type == NL80211_IFTYPE_AP) { 840 local->fif_pspoll--; 841 local->fif_probe_req--; 842 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 843 local->fif_probe_req--; 844 } 845 846 if (sdata->dev) { 847 netif_addr_lock_bh(sdata->dev); 848 spin_lock_bh(&local->filter_lock); 849 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc, 850 sdata->dev->addr_len); 851 spin_unlock_bh(&local->filter_lock); 852 netif_addr_unlock_bh(sdata->dev); 853 } 854 855 del_timer_sync(&local->dynamic_ps_timer); 856 cancel_work_sync(&local->dynamic_ps_enable_work); 857 858 cancel_work_sync(&sdata->recalc_smps); 859 sdata_lock(sdata); 860 mutex_lock(&local->mtx); 861 sdata->vif.csa_active = false; 862 if (sdata->vif.type == NL80211_IFTYPE_STATION) 863 sdata->u.mgd.csa_waiting_bcn = false; 864 if (sdata->csa_block_tx) { 865 ieee80211_wake_vif_queues(local, sdata, 866 IEEE80211_QUEUE_STOP_REASON_CSA); 867 sdata->csa_block_tx = false; 868 } 869 mutex_unlock(&local->mtx); 870 sdata_unlock(sdata); 871 872 cancel_work_sync(&sdata->csa_finalize_work); 873 874 cancel_delayed_work_sync(&sdata->dfs_cac_timer_work); 875 876 if (sdata->wdev.cac_started) { 877 chandef = sdata->vif.bss_conf.chandef; 878 WARN_ON(local->suspended); 879 mutex_lock(&local->mtx); 880 ieee80211_vif_release_channel(sdata); 881 mutex_unlock(&local->mtx); 882 cfg80211_cac_event(sdata->dev, &chandef, 883 NL80211_RADAR_CAC_ABORTED, 884 GFP_KERNEL); 885 } 886 887 /* APs need special treatment */ 888 if (sdata->vif.type == NL80211_IFTYPE_AP) { 889 struct ieee80211_sub_if_data *vlan, *tmpsdata; 890 891 /* down all dependent devices, that is VLANs */ 892 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans, 893 u.vlan.list) 894 dev_close(vlan->dev); 895 WARN_ON(!list_empty(&sdata->u.ap.vlans)); 896 } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 897 /* remove all packets in parent bc_buf pointing to this dev */ 898 ps = &sdata->bss->ps; 899 900 spin_lock_irqsave(&ps->bc_buf.lock, flags); 901 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) { 902 if (skb->dev == sdata->dev) { 903 __skb_unlink(skb, &ps->bc_buf); 904 local->total_ps_buffered--; 905 ieee80211_free_txskb(&local->hw, skb); 906 } 907 } 908 spin_unlock_irqrestore(&ps->bc_buf.lock, flags); 909 } 910 911 if (going_down) 912 local->open_count--; 913 914 switch (sdata->vif.type) { 915 case NL80211_IFTYPE_AP_VLAN: 916 mutex_lock(&local->mtx); 917 list_del(&sdata->u.vlan.list); 918 mutex_unlock(&local->mtx); 919 RCU_INIT_POINTER(sdata->vif.chanctx_conf, NULL); 920 /* see comment in the default case below */ 921 ieee80211_free_keys(sdata, true); 922 /* no need to tell driver */ 923 break; 924 case NL80211_IFTYPE_MONITOR: 925 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) { 926 local->cooked_mntrs--; 927 break; 928 } 929 930 local->monitors--; 931 if (local->monitors == 0) { 932 local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR; 933 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR; 934 } 935 936 ieee80211_adjust_monitor_flags(sdata, -1); 937 break; 938 case NL80211_IFTYPE_P2P_DEVICE: 939 /* relies on synchronize_rcu() below */ 940 RCU_INIT_POINTER(local->p2p_sdata, NULL); 941 /* fall through */ 942 default: 943 cancel_work_sync(&sdata->work); 944 /* 945 * When we get here, the interface is marked down. 946 * Free the remaining keys, if there are any 947 * (which can happen in AP mode if userspace sets 948 * keys before the interface is operating, and maybe 949 * also in WDS mode) 950 * 951 * Force the key freeing to always synchronize_net() 952 * to wait for the RX path in case it is using this 953 * interface enqueuing frames at this very time on 954 * another CPU. 955 */ 956 ieee80211_free_keys(sdata, true); 957 skb_queue_purge(&sdata->skb_queue); 958 } 959 960 sdata->bss = NULL; 961 962 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 963 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) { 964 skb_queue_walk_safe(&local->pending[i], skb, tmp) { 965 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 966 if (info->control.vif == &sdata->vif) { 967 __skb_unlink(skb, &local->pending[i]); 968 ieee80211_free_txskb(&local->hw, skb); 969 } 970 } 971 } 972 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 973 974 if (sdata->vif.txq) { 975 struct txq_info *txqi = to_txq_info(sdata->vif.txq); 976 977 ieee80211_purge_tx_queue(&local->hw, &txqi->queue); 978 atomic_set(&sdata->txqs_len[txqi->txq.ac], 0); 979 } 980 981 if (local->open_count == 0) 982 ieee80211_clear_tx_pending(local); 983 984 /* 985 * If the interface goes down while suspended, presumably because 986 * the device was unplugged and that happens before our resume, 987 * then the driver is already unconfigured and the remainder of 988 * this function isn't needed. 989 * XXX: what about WoWLAN? If the device has software state, e.g. 990 * memory allocated, it might expect teardown commands from 991 * mac80211 here? 992 */ 993 if (local->suspended) { 994 WARN_ON(local->wowlan); 995 WARN_ON(rtnl_dereference(local->monitor_sdata)); 996 return; 997 } 998 999 switch (sdata->vif.type) { 1000 case NL80211_IFTYPE_AP_VLAN: 1001 break; 1002 case NL80211_IFTYPE_MONITOR: 1003 if (local->monitors == 0) 1004 ieee80211_del_virtual_monitor(local); 1005 1006 mutex_lock(&local->mtx); 1007 ieee80211_recalc_idle(local); 1008 mutex_unlock(&local->mtx); 1009 1010 if (!(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE)) 1011 break; 1012 1013 /* fall through */ 1014 default: 1015 if (going_down) 1016 drv_remove_interface(local, sdata); 1017 } 1018 1019 ieee80211_recalc_ps(local, -1); 1020 1021 if (cancel_scan) 1022 flush_delayed_work(&local->scan_work); 1023 1024 if (local->open_count == 0) { 1025 ieee80211_stop_device(local); 1026 1027 /* no reconfiguring after stop! */ 1028 return; 1029 } 1030 1031 /* do after stop to avoid reconfiguring when we stop anyway */ 1032 ieee80211_configure_filter(local); 1033 ieee80211_hw_config(local, hw_reconf_flags); 1034 1035 if (local->monitors == local->open_count) 1036 ieee80211_add_virtual_monitor(local); 1037 } 1038 1039 static int ieee80211_stop(struct net_device *dev) 1040 { 1041 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1042 1043 ieee80211_do_stop(sdata, true); 1044 1045 return 0; 1046 } 1047 1048 static void ieee80211_set_multicast_list(struct net_device *dev) 1049 { 1050 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1051 struct ieee80211_local *local = sdata->local; 1052 int allmulti, sdata_allmulti; 1053 1054 allmulti = !!(dev->flags & IFF_ALLMULTI); 1055 sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI); 1056 1057 if (allmulti != sdata_allmulti) { 1058 if (dev->flags & IFF_ALLMULTI) 1059 atomic_inc(&local->iff_allmultis); 1060 else 1061 atomic_dec(&local->iff_allmultis); 1062 sdata->flags ^= IEEE80211_SDATA_ALLMULTI; 1063 } 1064 1065 spin_lock_bh(&local->filter_lock); 1066 __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len); 1067 spin_unlock_bh(&local->filter_lock); 1068 ieee80211_queue_work(&local->hw, &local->reconfig_filter); 1069 } 1070 1071 /* 1072 * Called when the netdev is removed or, by the code below, before 1073 * the interface type changes. 1074 */ 1075 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata) 1076 { 1077 int i; 1078 1079 /* free extra data */ 1080 ieee80211_free_keys(sdata, false); 1081 1082 ieee80211_debugfs_remove_netdev(sdata); 1083 1084 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) 1085 __skb_queue_purge(&sdata->fragments[i].skb_list); 1086 sdata->fragment_next = 0; 1087 1088 if (ieee80211_vif_is_mesh(&sdata->vif)) 1089 mesh_rmc_free(sdata); 1090 } 1091 1092 static void ieee80211_uninit(struct net_device *dev) 1093 { 1094 ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev)); 1095 } 1096 1097 static u16 ieee80211_netdev_select_queue(struct net_device *dev, 1098 struct sk_buff *skb, 1099 void *accel_priv, 1100 select_queue_fallback_t fallback) 1101 { 1102 return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb); 1103 } 1104 1105 static struct rtnl_link_stats64 * 1106 ieee80211_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats) 1107 { 1108 int i; 1109 1110 for_each_possible_cpu(i) { 1111 const struct pcpu_sw_netstats *tstats; 1112 u64 rx_packets, rx_bytes, tx_packets, tx_bytes; 1113 unsigned int start; 1114 1115 tstats = per_cpu_ptr(dev->tstats, i); 1116 1117 do { 1118 start = u64_stats_fetch_begin_irq(&tstats->syncp); 1119 rx_packets = tstats->rx_packets; 1120 tx_packets = tstats->tx_packets; 1121 rx_bytes = tstats->rx_bytes; 1122 tx_bytes = tstats->tx_bytes; 1123 } while (u64_stats_fetch_retry_irq(&tstats->syncp, start)); 1124 1125 stats->rx_packets += rx_packets; 1126 stats->tx_packets += tx_packets; 1127 stats->rx_bytes += rx_bytes; 1128 stats->tx_bytes += tx_bytes; 1129 } 1130 1131 return stats; 1132 } 1133 1134 static const struct net_device_ops ieee80211_dataif_ops = { 1135 .ndo_open = ieee80211_open, 1136 .ndo_stop = ieee80211_stop, 1137 .ndo_uninit = ieee80211_uninit, 1138 .ndo_start_xmit = ieee80211_subif_start_xmit, 1139 .ndo_set_rx_mode = ieee80211_set_multicast_list, 1140 .ndo_change_mtu = ieee80211_change_mtu, 1141 .ndo_set_mac_address = ieee80211_change_mac, 1142 .ndo_select_queue = ieee80211_netdev_select_queue, 1143 .ndo_get_stats64 = ieee80211_get_stats64, 1144 }; 1145 1146 static u16 ieee80211_monitor_select_queue(struct net_device *dev, 1147 struct sk_buff *skb, 1148 void *accel_priv, 1149 select_queue_fallback_t fallback) 1150 { 1151 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1152 struct ieee80211_local *local = sdata->local; 1153 struct ieee80211_hdr *hdr; 1154 struct ieee80211_radiotap_header *rtap = (void *)skb->data; 1155 1156 if (local->hw.queues < IEEE80211_NUM_ACS) 1157 return 0; 1158 1159 if (skb->len < 4 || 1160 skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */) 1161 return 0; /* doesn't matter, frame will be dropped */ 1162 1163 hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len)); 1164 1165 return ieee80211_select_queue_80211(sdata, skb, hdr); 1166 } 1167 1168 static const struct net_device_ops ieee80211_monitorif_ops = { 1169 .ndo_open = ieee80211_open, 1170 .ndo_stop = ieee80211_stop, 1171 .ndo_uninit = ieee80211_uninit, 1172 .ndo_start_xmit = ieee80211_monitor_start_xmit, 1173 .ndo_set_rx_mode = ieee80211_set_multicast_list, 1174 .ndo_change_mtu = ieee80211_change_mtu, 1175 .ndo_set_mac_address = ieee80211_change_mac, 1176 .ndo_select_queue = ieee80211_monitor_select_queue, 1177 .ndo_get_stats64 = ieee80211_get_stats64, 1178 }; 1179 1180 static void ieee80211_if_free(struct net_device *dev) 1181 { 1182 free_percpu(dev->tstats); 1183 free_netdev(dev); 1184 } 1185 1186 static void ieee80211_if_setup(struct net_device *dev) 1187 { 1188 ether_setup(dev); 1189 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1190 dev->netdev_ops = &ieee80211_dataif_ops; 1191 dev->destructor = ieee80211_if_free; 1192 } 1193 1194 static void ieee80211_iface_work(struct work_struct *work) 1195 { 1196 struct ieee80211_sub_if_data *sdata = 1197 container_of(work, struct ieee80211_sub_if_data, work); 1198 struct ieee80211_local *local = sdata->local; 1199 struct sk_buff *skb; 1200 struct sta_info *sta; 1201 struct ieee80211_ra_tid *ra_tid; 1202 struct ieee80211_rx_agg *rx_agg; 1203 1204 if (!ieee80211_sdata_running(sdata)) 1205 return; 1206 1207 if (local->scanning) 1208 return; 1209 1210 if (!ieee80211_can_run_worker(local)) 1211 return; 1212 1213 /* first process frames */ 1214 while ((skb = skb_dequeue(&sdata->skb_queue))) { 1215 struct ieee80211_mgmt *mgmt = (void *)skb->data; 1216 1217 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) { 1218 ra_tid = (void *)&skb->cb; 1219 ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra, 1220 ra_tid->tid); 1221 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) { 1222 ra_tid = (void *)&skb->cb; 1223 ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra, 1224 ra_tid->tid); 1225 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_RX_AGG_START) { 1226 rx_agg = (void *)&skb->cb; 1227 mutex_lock(&local->sta_mtx); 1228 sta = sta_info_get_bss(sdata, rx_agg->addr); 1229 if (sta) 1230 __ieee80211_start_rx_ba_session(sta, 1231 0, 0, 0, 1, rx_agg->tid, 1232 IEEE80211_MAX_AMPDU_BUF, 1233 false, true); 1234 mutex_unlock(&local->sta_mtx); 1235 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_RX_AGG_STOP) { 1236 rx_agg = (void *)&skb->cb; 1237 mutex_lock(&local->sta_mtx); 1238 sta = sta_info_get_bss(sdata, rx_agg->addr); 1239 if (sta) 1240 __ieee80211_stop_rx_ba_session(sta, 1241 rx_agg->tid, 1242 WLAN_BACK_RECIPIENT, 0, 1243 false); 1244 mutex_unlock(&local->sta_mtx); 1245 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_TDLS_CHSW) { 1246 ieee80211_process_tdls_channel_switch(sdata, skb); 1247 } else if (ieee80211_is_action(mgmt->frame_control) && 1248 mgmt->u.action.category == WLAN_CATEGORY_BACK) { 1249 int len = skb->len; 1250 1251 mutex_lock(&local->sta_mtx); 1252 sta = sta_info_get_bss(sdata, mgmt->sa); 1253 if (sta) { 1254 switch (mgmt->u.action.u.addba_req.action_code) { 1255 case WLAN_ACTION_ADDBA_REQ: 1256 ieee80211_process_addba_request( 1257 local, sta, mgmt, len); 1258 break; 1259 case WLAN_ACTION_ADDBA_RESP: 1260 ieee80211_process_addba_resp(local, sta, 1261 mgmt, len); 1262 break; 1263 case WLAN_ACTION_DELBA: 1264 ieee80211_process_delba(sdata, sta, 1265 mgmt, len); 1266 break; 1267 default: 1268 WARN_ON(1); 1269 break; 1270 } 1271 } 1272 mutex_unlock(&local->sta_mtx); 1273 } else if (ieee80211_is_data_qos(mgmt->frame_control)) { 1274 struct ieee80211_hdr *hdr = (void *)mgmt; 1275 /* 1276 * So the frame isn't mgmt, but frame_control 1277 * is at the right place anyway, of course, so 1278 * the if statement is correct. 1279 * 1280 * Warn if we have other data frame types here, 1281 * they must not get here. 1282 */ 1283 WARN_ON(hdr->frame_control & 1284 cpu_to_le16(IEEE80211_STYPE_NULLFUNC)); 1285 WARN_ON(!(hdr->seq_ctrl & 1286 cpu_to_le16(IEEE80211_SCTL_FRAG))); 1287 /* 1288 * This was a fragment of a frame, received while 1289 * a block-ack session was active. That cannot be 1290 * right, so terminate the session. 1291 */ 1292 mutex_lock(&local->sta_mtx); 1293 sta = sta_info_get_bss(sdata, mgmt->sa); 1294 if (sta) { 1295 u16 tid = *ieee80211_get_qos_ctl(hdr) & 1296 IEEE80211_QOS_CTL_TID_MASK; 1297 1298 __ieee80211_stop_rx_ba_session( 1299 sta, tid, WLAN_BACK_RECIPIENT, 1300 WLAN_REASON_QSTA_REQUIRE_SETUP, 1301 true); 1302 } 1303 mutex_unlock(&local->sta_mtx); 1304 } else switch (sdata->vif.type) { 1305 case NL80211_IFTYPE_STATION: 1306 ieee80211_sta_rx_queued_mgmt(sdata, skb); 1307 break; 1308 case NL80211_IFTYPE_ADHOC: 1309 ieee80211_ibss_rx_queued_mgmt(sdata, skb); 1310 break; 1311 case NL80211_IFTYPE_MESH_POINT: 1312 if (!ieee80211_vif_is_mesh(&sdata->vif)) 1313 break; 1314 ieee80211_mesh_rx_queued_mgmt(sdata, skb); 1315 break; 1316 default: 1317 WARN(1, "frame for unexpected interface type"); 1318 break; 1319 } 1320 1321 kfree_skb(skb); 1322 } 1323 1324 /* then other type-dependent work */ 1325 switch (sdata->vif.type) { 1326 case NL80211_IFTYPE_STATION: 1327 ieee80211_sta_work(sdata); 1328 break; 1329 case NL80211_IFTYPE_ADHOC: 1330 ieee80211_ibss_work(sdata); 1331 break; 1332 case NL80211_IFTYPE_MESH_POINT: 1333 if (!ieee80211_vif_is_mesh(&sdata->vif)) 1334 break; 1335 ieee80211_mesh_work(sdata); 1336 break; 1337 case NL80211_IFTYPE_OCB: 1338 ieee80211_ocb_work(sdata); 1339 break; 1340 default: 1341 break; 1342 } 1343 } 1344 1345 static void ieee80211_recalc_smps_work(struct work_struct *work) 1346 { 1347 struct ieee80211_sub_if_data *sdata = 1348 container_of(work, struct ieee80211_sub_if_data, recalc_smps); 1349 1350 ieee80211_recalc_smps(sdata); 1351 } 1352 1353 /* 1354 * Helper function to initialise an interface to a specific type. 1355 */ 1356 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata, 1357 enum nl80211_iftype type) 1358 { 1359 static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff, 1360 0xff, 0xff, 0xff}; 1361 1362 /* clear type-dependent union */ 1363 memset(&sdata->u, 0, sizeof(sdata->u)); 1364 1365 /* and set some type-dependent values */ 1366 sdata->vif.type = type; 1367 sdata->vif.p2p = false; 1368 sdata->wdev.iftype = type; 1369 1370 sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE); 1371 sdata->control_port_no_encrypt = false; 1372 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM; 1373 sdata->vif.bss_conf.idle = true; 1374 1375 sdata->noack_map = 0; 1376 1377 /* only monitor/p2p-device differ */ 1378 if (sdata->dev) { 1379 sdata->dev->netdev_ops = &ieee80211_dataif_ops; 1380 sdata->dev->type = ARPHRD_ETHER; 1381 } 1382 1383 skb_queue_head_init(&sdata->skb_queue); 1384 INIT_WORK(&sdata->work, ieee80211_iface_work); 1385 INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work); 1386 INIT_WORK(&sdata->csa_finalize_work, ieee80211_csa_finalize_work); 1387 INIT_LIST_HEAD(&sdata->assigned_chanctx_list); 1388 INIT_LIST_HEAD(&sdata->reserved_chanctx_list); 1389 1390 switch (type) { 1391 case NL80211_IFTYPE_P2P_GO: 1392 type = NL80211_IFTYPE_AP; 1393 sdata->vif.type = type; 1394 sdata->vif.p2p = true; 1395 /* fall through */ 1396 case NL80211_IFTYPE_AP: 1397 skb_queue_head_init(&sdata->u.ap.ps.bc_buf); 1398 INIT_LIST_HEAD(&sdata->u.ap.vlans); 1399 INIT_WORK(&sdata->u.ap.request_smps_work, 1400 ieee80211_request_smps_ap_work); 1401 sdata->vif.bss_conf.bssid = sdata->vif.addr; 1402 sdata->u.ap.req_smps = IEEE80211_SMPS_OFF; 1403 break; 1404 case NL80211_IFTYPE_P2P_CLIENT: 1405 type = NL80211_IFTYPE_STATION; 1406 sdata->vif.type = type; 1407 sdata->vif.p2p = true; 1408 /* fall through */ 1409 case NL80211_IFTYPE_STATION: 1410 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid; 1411 ieee80211_sta_setup_sdata(sdata); 1412 break; 1413 case NL80211_IFTYPE_OCB: 1414 sdata->vif.bss_conf.bssid = bssid_wildcard; 1415 ieee80211_ocb_setup_sdata(sdata); 1416 break; 1417 case NL80211_IFTYPE_ADHOC: 1418 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid; 1419 ieee80211_ibss_setup_sdata(sdata); 1420 break; 1421 case NL80211_IFTYPE_MESH_POINT: 1422 if (ieee80211_vif_is_mesh(&sdata->vif)) 1423 ieee80211_mesh_init_sdata(sdata); 1424 break; 1425 case NL80211_IFTYPE_MONITOR: 1426 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP; 1427 sdata->dev->netdev_ops = &ieee80211_monitorif_ops; 1428 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL | 1429 MONITOR_FLAG_OTHER_BSS; 1430 break; 1431 case NL80211_IFTYPE_WDS: 1432 sdata->vif.bss_conf.bssid = NULL; 1433 break; 1434 case NL80211_IFTYPE_AP_VLAN: 1435 case NL80211_IFTYPE_P2P_DEVICE: 1436 sdata->vif.bss_conf.bssid = sdata->vif.addr; 1437 break; 1438 case NL80211_IFTYPE_UNSPECIFIED: 1439 case NUM_NL80211_IFTYPES: 1440 BUG(); 1441 break; 1442 } 1443 1444 ieee80211_debugfs_add_netdev(sdata); 1445 } 1446 1447 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata, 1448 enum nl80211_iftype type) 1449 { 1450 struct ieee80211_local *local = sdata->local; 1451 int ret, err; 1452 enum nl80211_iftype internal_type = type; 1453 bool p2p = false; 1454 1455 ASSERT_RTNL(); 1456 1457 if (!local->ops->change_interface) 1458 return -EBUSY; 1459 1460 switch (sdata->vif.type) { 1461 case NL80211_IFTYPE_AP: 1462 case NL80211_IFTYPE_STATION: 1463 case NL80211_IFTYPE_ADHOC: 1464 case NL80211_IFTYPE_OCB: 1465 /* 1466 * Could maybe also all others here? 1467 * Just not sure how that interacts 1468 * with the RX/config path e.g. for 1469 * mesh. 1470 */ 1471 break; 1472 default: 1473 return -EBUSY; 1474 } 1475 1476 switch (type) { 1477 case NL80211_IFTYPE_AP: 1478 case NL80211_IFTYPE_STATION: 1479 case NL80211_IFTYPE_ADHOC: 1480 case NL80211_IFTYPE_OCB: 1481 /* 1482 * Could probably support everything 1483 * but WDS here (WDS do_open can fail 1484 * under memory pressure, which this 1485 * code isn't prepared to handle). 1486 */ 1487 break; 1488 case NL80211_IFTYPE_P2P_CLIENT: 1489 p2p = true; 1490 internal_type = NL80211_IFTYPE_STATION; 1491 break; 1492 case NL80211_IFTYPE_P2P_GO: 1493 p2p = true; 1494 internal_type = NL80211_IFTYPE_AP; 1495 break; 1496 default: 1497 return -EBUSY; 1498 } 1499 1500 ret = ieee80211_check_concurrent_iface(sdata, internal_type); 1501 if (ret) 1502 return ret; 1503 1504 ieee80211_do_stop(sdata, false); 1505 1506 ieee80211_teardown_sdata(sdata); 1507 1508 ret = drv_change_interface(local, sdata, internal_type, p2p); 1509 if (ret) 1510 type = ieee80211_vif_type_p2p(&sdata->vif); 1511 1512 /* 1513 * Ignore return value here, there's not much we can do since 1514 * the driver changed the interface type internally already. 1515 * The warnings will hopefully make driver authors fix it :-) 1516 */ 1517 ieee80211_check_queues(sdata, type); 1518 1519 ieee80211_setup_sdata(sdata, type); 1520 1521 err = ieee80211_do_open(&sdata->wdev, false); 1522 WARN(err, "type change: do_open returned %d", err); 1523 1524 return ret; 1525 } 1526 1527 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata, 1528 enum nl80211_iftype type) 1529 { 1530 int ret; 1531 1532 ASSERT_RTNL(); 1533 1534 if (type == ieee80211_vif_type_p2p(&sdata->vif)) 1535 return 0; 1536 1537 if (ieee80211_sdata_running(sdata)) { 1538 ret = ieee80211_runtime_change_iftype(sdata, type); 1539 if (ret) 1540 return ret; 1541 } else { 1542 /* Purge and reset type-dependent state. */ 1543 ieee80211_teardown_sdata(sdata); 1544 ieee80211_setup_sdata(sdata, type); 1545 } 1546 1547 /* reset some values that shouldn't be kept across type changes */ 1548 if (type == NL80211_IFTYPE_STATION) 1549 sdata->u.mgd.use_4addr = false; 1550 1551 return 0; 1552 } 1553 1554 static void ieee80211_assign_perm_addr(struct ieee80211_local *local, 1555 u8 *perm_addr, enum nl80211_iftype type) 1556 { 1557 struct ieee80211_sub_if_data *sdata; 1558 u64 mask, start, addr, val, inc; 1559 u8 *m; 1560 u8 tmp_addr[ETH_ALEN]; 1561 int i; 1562 1563 /* default ... something at least */ 1564 memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN); 1565 1566 if (is_zero_ether_addr(local->hw.wiphy->addr_mask) && 1567 local->hw.wiphy->n_addresses <= 1) 1568 return; 1569 1570 mutex_lock(&local->iflist_mtx); 1571 1572 switch (type) { 1573 case NL80211_IFTYPE_MONITOR: 1574 /* doesn't matter */ 1575 break; 1576 case NL80211_IFTYPE_WDS: 1577 case NL80211_IFTYPE_AP_VLAN: 1578 /* match up with an AP interface */ 1579 list_for_each_entry(sdata, &local->interfaces, list) { 1580 if (sdata->vif.type != NL80211_IFTYPE_AP) 1581 continue; 1582 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN); 1583 break; 1584 } 1585 /* keep default if no AP interface present */ 1586 break; 1587 case NL80211_IFTYPE_P2P_CLIENT: 1588 case NL80211_IFTYPE_P2P_GO: 1589 if (ieee80211_hw_check(&local->hw, P2P_DEV_ADDR_FOR_INTF)) { 1590 list_for_each_entry(sdata, &local->interfaces, list) { 1591 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) 1592 continue; 1593 if (!ieee80211_sdata_running(sdata)) 1594 continue; 1595 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN); 1596 goto out_unlock; 1597 } 1598 } 1599 /* otherwise fall through */ 1600 default: 1601 /* assign a new address if possible -- try n_addresses first */ 1602 for (i = 0; i < local->hw.wiphy->n_addresses; i++) { 1603 bool used = false; 1604 1605 list_for_each_entry(sdata, &local->interfaces, list) { 1606 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr, 1607 sdata->vif.addr)) { 1608 used = true; 1609 break; 1610 } 1611 } 1612 1613 if (!used) { 1614 memcpy(perm_addr, 1615 local->hw.wiphy->addresses[i].addr, 1616 ETH_ALEN); 1617 break; 1618 } 1619 } 1620 1621 /* try mask if available */ 1622 if (is_zero_ether_addr(local->hw.wiphy->addr_mask)) 1623 break; 1624 1625 m = local->hw.wiphy->addr_mask; 1626 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 1627 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 1628 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 1629 1630 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) { 1631 /* not a contiguous mask ... not handled now! */ 1632 pr_info("not contiguous\n"); 1633 break; 1634 } 1635 1636 /* 1637 * Pick address of existing interface in case user changed 1638 * MAC address manually, default to perm_addr. 1639 */ 1640 m = local->hw.wiphy->perm_addr; 1641 list_for_each_entry(sdata, &local->interfaces, list) { 1642 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) 1643 continue; 1644 m = sdata->vif.addr; 1645 break; 1646 } 1647 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 1648 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 1649 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 1650 1651 inc = 1ULL<<__ffs64(mask); 1652 val = (start & mask); 1653 addr = (start & ~mask) | (val & mask); 1654 do { 1655 bool used = false; 1656 1657 tmp_addr[5] = addr >> 0*8; 1658 tmp_addr[4] = addr >> 1*8; 1659 tmp_addr[3] = addr >> 2*8; 1660 tmp_addr[2] = addr >> 3*8; 1661 tmp_addr[1] = addr >> 4*8; 1662 tmp_addr[0] = addr >> 5*8; 1663 1664 val += inc; 1665 1666 list_for_each_entry(sdata, &local->interfaces, list) { 1667 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) { 1668 used = true; 1669 break; 1670 } 1671 } 1672 1673 if (!used) { 1674 memcpy(perm_addr, tmp_addr, ETH_ALEN); 1675 break; 1676 } 1677 addr = (start & ~mask) | (val & mask); 1678 } while (addr != start); 1679 1680 break; 1681 } 1682 1683 out_unlock: 1684 mutex_unlock(&local->iflist_mtx); 1685 } 1686 1687 int ieee80211_if_add(struct ieee80211_local *local, const char *name, 1688 unsigned char name_assign_type, 1689 struct wireless_dev **new_wdev, enum nl80211_iftype type, 1690 struct vif_params *params) 1691 { 1692 struct net_device *ndev = NULL; 1693 struct ieee80211_sub_if_data *sdata = NULL; 1694 struct txq_info *txqi; 1695 int ret, i; 1696 int txqs = 1; 1697 1698 ASSERT_RTNL(); 1699 1700 if (type == NL80211_IFTYPE_P2P_DEVICE) { 1701 struct wireless_dev *wdev; 1702 1703 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, 1704 GFP_KERNEL); 1705 if (!sdata) 1706 return -ENOMEM; 1707 wdev = &sdata->wdev; 1708 1709 sdata->dev = NULL; 1710 strlcpy(sdata->name, name, IFNAMSIZ); 1711 ieee80211_assign_perm_addr(local, wdev->address, type); 1712 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN); 1713 } else { 1714 int size = ALIGN(sizeof(*sdata) + local->hw.vif_data_size, 1715 sizeof(void *)); 1716 int txq_size = 0; 1717 1718 if (local->ops->wake_tx_queue) 1719 txq_size += sizeof(struct txq_info) + 1720 local->hw.txq_data_size; 1721 1722 if (local->hw.queues >= IEEE80211_NUM_ACS) 1723 txqs = IEEE80211_NUM_ACS; 1724 1725 ndev = alloc_netdev_mqs(size + txq_size, 1726 name, name_assign_type, 1727 ieee80211_if_setup, txqs, 1); 1728 if (!ndev) 1729 return -ENOMEM; 1730 dev_net_set(ndev, wiphy_net(local->hw.wiphy)); 1731 1732 ndev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 1733 if (!ndev->tstats) { 1734 free_netdev(ndev); 1735 return -ENOMEM; 1736 } 1737 1738 ndev->needed_headroom = local->tx_headroom + 1739 4*6 /* four MAC addresses */ 1740 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */ 1741 + 6 /* mesh */ 1742 + 8 /* rfc1042/bridge tunnel */ 1743 - ETH_HLEN /* ethernet hard_header_len */ 1744 + IEEE80211_ENCRYPT_HEADROOM; 1745 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM; 1746 1747 ret = dev_alloc_name(ndev, ndev->name); 1748 if (ret < 0) { 1749 free_netdev(ndev); 1750 return ret; 1751 } 1752 1753 ieee80211_assign_perm_addr(local, ndev->perm_addr, type); 1754 if (params && is_valid_ether_addr(params->macaddr)) 1755 memcpy(ndev->dev_addr, params->macaddr, ETH_ALEN); 1756 else 1757 memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN); 1758 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy)); 1759 1760 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */ 1761 sdata = netdev_priv(ndev); 1762 ndev->ieee80211_ptr = &sdata->wdev; 1763 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN); 1764 memcpy(sdata->name, ndev->name, IFNAMSIZ); 1765 1766 if (txq_size) { 1767 txqi = netdev_priv(ndev) + size; 1768 ieee80211_init_tx_queue(sdata, NULL, txqi, 0); 1769 } 1770 1771 sdata->dev = ndev; 1772 } 1773 1774 /* initialise type-independent data */ 1775 sdata->wdev.wiphy = local->hw.wiphy; 1776 sdata->local = local; 1777 1778 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) 1779 skb_queue_head_init(&sdata->fragments[i].skb_list); 1780 1781 INIT_LIST_HEAD(&sdata->key_list); 1782 1783 INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work, 1784 ieee80211_dfs_cac_timer_work); 1785 INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk, 1786 ieee80211_delayed_tailroom_dec); 1787 1788 for (i = 0; i < IEEE80211_NUM_BANDS; i++) { 1789 struct ieee80211_supported_band *sband; 1790 sband = local->hw.wiphy->bands[i]; 1791 sdata->rc_rateidx_mask[i] = 1792 sband ? (1 << sband->n_bitrates) - 1 : 0; 1793 if (sband) 1794 memcpy(sdata->rc_rateidx_mcs_mask[i], 1795 sband->ht_cap.mcs.rx_mask, 1796 sizeof(sdata->rc_rateidx_mcs_mask[i])); 1797 else 1798 memset(sdata->rc_rateidx_mcs_mask[i], 0, 1799 sizeof(sdata->rc_rateidx_mcs_mask[i])); 1800 } 1801 1802 ieee80211_set_default_queues(sdata); 1803 1804 sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL; 1805 sdata->user_power_level = local->user_power_level; 1806 1807 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM; 1808 1809 /* setup type-dependent data */ 1810 ieee80211_setup_sdata(sdata, type); 1811 1812 if (ndev) { 1813 if (params) { 1814 ndev->ieee80211_ptr->use_4addr = params->use_4addr; 1815 if (type == NL80211_IFTYPE_STATION) 1816 sdata->u.mgd.use_4addr = params->use_4addr; 1817 } 1818 1819 ndev->features |= local->hw.netdev_features; 1820 1821 netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops); 1822 1823 ret = register_netdevice(ndev); 1824 if (ret) { 1825 free_netdev(ndev); 1826 return ret; 1827 } 1828 } 1829 1830 mutex_lock(&local->iflist_mtx); 1831 list_add_tail_rcu(&sdata->list, &local->interfaces); 1832 mutex_unlock(&local->iflist_mtx); 1833 1834 if (new_wdev) 1835 *new_wdev = &sdata->wdev; 1836 1837 return 0; 1838 } 1839 1840 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata) 1841 { 1842 ASSERT_RTNL(); 1843 1844 mutex_lock(&sdata->local->iflist_mtx); 1845 list_del_rcu(&sdata->list); 1846 mutex_unlock(&sdata->local->iflist_mtx); 1847 1848 synchronize_rcu(); 1849 1850 if (sdata->dev) { 1851 unregister_netdevice(sdata->dev); 1852 } else { 1853 cfg80211_unregister_wdev(&sdata->wdev); 1854 kfree(sdata); 1855 } 1856 } 1857 1858 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata) 1859 { 1860 if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state))) 1861 return; 1862 ieee80211_do_stop(sdata, true); 1863 ieee80211_teardown_sdata(sdata); 1864 } 1865 1866 void ieee80211_remove_interfaces(struct ieee80211_local *local) 1867 { 1868 struct ieee80211_sub_if_data *sdata, *tmp; 1869 LIST_HEAD(unreg_list); 1870 LIST_HEAD(wdev_list); 1871 1872 ASSERT_RTNL(); 1873 1874 /* Before destroying the interfaces, make sure they're all stopped so 1875 * that the hardware is stopped. Otherwise, the driver might still be 1876 * iterating the interfaces during the shutdown, e.g. from a worker 1877 * or from RX processing or similar, and if it does so (using atomic 1878 * iteration) while we're manipulating the list, the iteration will 1879 * crash. 1880 * 1881 * After this, the hardware should be stopped and the driver should 1882 * have stopped all of its activities, so that we can do RCU-unaware 1883 * manipulations of the interface list below. 1884 */ 1885 cfg80211_shutdown_all_interfaces(local->hw.wiphy); 1886 1887 WARN(local->open_count, "%s: open count remains %d\n", 1888 wiphy_name(local->hw.wiphy), local->open_count); 1889 1890 mutex_lock(&local->iflist_mtx); 1891 list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) { 1892 list_del(&sdata->list); 1893 1894 if (sdata->dev) 1895 unregister_netdevice_queue(sdata->dev, &unreg_list); 1896 else 1897 list_add(&sdata->list, &wdev_list); 1898 } 1899 mutex_unlock(&local->iflist_mtx); 1900 unregister_netdevice_many(&unreg_list); 1901 1902 list_for_each_entry_safe(sdata, tmp, &wdev_list, list) { 1903 list_del(&sdata->list); 1904 cfg80211_unregister_wdev(&sdata->wdev); 1905 kfree(sdata); 1906 } 1907 } 1908 1909 static int netdev_notify(struct notifier_block *nb, 1910 unsigned long state, void *ptr) 1911 { 1912 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 1913 struct ieee80211_sub_if_data *sdata; 1914 1915 if (state != NETDEV_CHANGENAME) 1916 return NOTIFY_DONE; 1917 1918 if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy) 1919 return NOTIFY_DONE; 1920 1921 if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid) 1922 return NOTIFY_DONE; 1923 1924 sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1925 memcpy(sdata->name, dev->name, IFNAMSIZ); 1926 ieee80211_debugfs_rename_netdev(sdata); 1927 1928 return NOTIFY_OK; 1929 } 1930 1931 static struct notifier_block mac80211_netdev_notifier = { 1932 .notifier_call = netdev_notify, 1933 }; 1934 1935 int ieee80211_iface_init(void) 1936 { 1937 return register_netdevice_notifier(&mac80211_netdev_notifier); 1938 } 1939 1940 void ieee80211_iface_exit(void) 1941 { 1942 unregister_netdevice_notifier(&mac80211_netdev_notifier); 1943 } 1944