net/mac80211/iface.c

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