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  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13 #include <linux/slab.h>
  14 #include <linux/kernel.h>
  15 #include <linux/if_arp.h>
  16 #include <linux/netdevice.h>
  17 #include <linux/rtnetlink.h>
  18 #include <net/mac80211.h>
  19 #include <net/ieee80211_radiotap.h>
  20 #include "ieee80211_i.h"
  21 #include "sta_info.h"
  22 #include "debugfs_netdev.h"
  23 #include "mesh.h"
  24 #include "led.h"
  25 #include "driver-ops.h"
  26 #include "wme.h"
  27 #include "rate.h"
  28
  29 /**
  30  * DOC: Interface list locking
  31  *
  32  * The interface list in each struct ieee80211_local is protected
  33  * three-fold:
  34  *
  35  * (1) modifications may only be done under the RTNL
  36  * (2) modifications and readers are protected against each other by
  37  *     the iflist_mtx.
  38  * (3) modifications are done in an RCU manner so atomic readers
  39  *     can traverse the list in RCU-safe blocks.
  40  *
  41  * As a consequence, reads (traversals) of the list can be protected
  42  * by either the RTNL, the iflist_mtx or RCU.
  43  */
  44
  45 bool __ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
  46 {
  47         struct ieee80211_chanctx_conf *chanctx_conf;
  48         int power;
  49
  50         rcu_read_lock();
  51         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
  52         if (!chanctx_conf) {
  53                 rcu_read_unlock();
  54                 return false;
  55         }
  56
  57         power = ieee80211_chandef_max_power(&chanctx_conf->def);
  58         rcu_read_unlock();
  59
  60         if (sdata->user_power_level != IEEE80211_UNSET_POWER_LEVEL)
  61                 power = min(power, sdata->user_power_level);
  62
  63         if (sdata->ap_power_level != IEEE80211_UNSET_POWER_LEVEL)
  64                 power = min(power, sdata->ap_power_level);
  65
  66         if (power != sdata->vif.bss_conf.txpower) {
  67                 sdata->vif.bss_conf.txpower = power;
  68                 ieee80211_hw_config(sdata->local, 0);
  69                 return true;
  70         }
  71
  72         return false;
  73 }
  74
  75 void ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
  76 {
  77         if (__ieee80211_recalc_txpower(sdata))
  78                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_TXPOWER);
  79 }
  80
  81 static u32 __ieee80211_idle_off(struct ieee80211_local *local)
  82 {
  83         if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
  84                 return 0;
  85
  86         local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
  87         return IEEE80211_CONF_CHANGE_IDLE;
  88 }
  89
  90 static u32 __ieee80211_idle_on(struct ieee80211_local *local)
  91 {
  92         if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
  93                 return 0;
  94
  95         ieee80211_flush_queues(local, NULL);
  96
  97         local->hw.conf.flags |= IEEE80211_CONF_IDLE;
  98         return IEEE80211_CONF_CHANGE_IDLE;
  99 }
 100
 101 static u32 __ieee80211_recalc_idle(struct ieee80211_local *local,
 102                                    bool force_active)
 103 {
 104         bool working, scanning, active;
 105         unsigned int led_trig_start = 0, led_trig_stop = 0;
 106
 107         lockdep_assert_held(&local->mtx);
 108
 109         active = force_active ||
 110                  !list_empty(&local->chanctx_list) ||
 111                  local->monitors;
 112
 113         working = !local->ops->remain_on_channel &&
 114                   !list_empty(&local->roc_list);
 115
 116         scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) ||
 117                    test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning);
 118
 119         if (working || scanning)
 120                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
 121         else
 122                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
 123
 124         if (active)
 125                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
 126         else
 127                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
 128
 129         ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
 130
 131         if (working || scanning || active)
 132                 return __ieee80211_idle_off(local);
 133         return __ieee80211_idle_on(local);
 134 }
 135
 136 u32 ieee80211_idle_off(struct ieee80211_local *local)
 137 {
 138         return __ieee80211_recalc_idle(local, true);
 139 }
 140
 141 void ieee80211_recalc_idle(struct ieee80211_local *local)
 142 {
 143         u32 change = __ieee80211_recalc_idle(local, false);
 144         if (change)
 145                 ieee80211_hw_config(local, change);
 146 }
 147
 148 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
 149 {
 150         if (new_mtu < 256 || new_mtu > IEEE80211_MAX_DATA_LEN)
 151                 return -EINVAL;
 152
 153         dev->mtu = new_mtu;
 154         return 0;
 155 }
 156
 157 static int ieee80211_verify_mac(struct ieee80211_sub_if_data *sdata, u8 *addr,
 158                                 bool check_dup)
 159 {
 160         struct ieee80211_local *local = sdata->local;
 161         struct ieee80211_sub_if_data *iter;
 162         u64 new, mask, tmp;
 163         u8 *m;
 164         int ret = 0;
 165
 166         if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
 167                 return 0;
 168
 169         m = addr;
 170         new =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 171                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 172                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 173
 174         m = local->hw.wiphy->addr_mask;
 175         mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 176                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 177                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 178
 179         if (!check_dup)
 180                 return ret;
 181
 182         mutex_lock(&local->iflist_mtx);
 183         list_for_each_entry(iter, &local->interfaces, list) {
 184                 if (iter == sdata)
 185                         continue;
 186
 187                 if (iter->vif.type == NL80211_IFTYPE_MONITOR &&
 188                     !(iter->u.mntr_flags & MONITOR_FLAG_ACTIVE))
 189                         continue;
 190
 191                 m = iter->vif.addr;
 192                 tmp =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 193                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 194                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 195
 196                 if ((new & ~mask) != (tmp & ~mask)) {
 197                         ret = -EINVAL;
 198                         break;
 199                 }
 200         }
 201         mutex_unlock(&local->iflist_mtx);
 202
 203         return ret;
 204 }
 205
 206 static int ieee80211_change_mac(struct net_device *dev, void *addr)
 207 {
 208         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 209         struct sockaddr *sa = addr;
 210         bool check_dup = true;
 211         int ret;
 212
 213         if (ieee80211_sdata_running(sdata))
 214                 return -EBUSY;
 215
 216         if (sdata->vif.type == NL80211_IFTYPE_MONITOR &&
 217             !(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE))
 218                 check_dup = false;
 219
 220         ret = ieee80211_verify_mac(sdata, sa->sa_data, check_dup);
 221         if (ret)
 222                 return ret;
 223
 224         ret = eth_mac_addr(dev, sa);
 225
 226         if (ret == 0)
 227                 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
 228
 229         return ret;
 230 }
 231
 232 static inline int identical_mac_addr_allowed(int type1, int type2)
 233 {
 234         return type1 == NL80211_IFTYPE_MONITOR ||
 235                 type2 == NL80211_IFTYPE_MONITOR ||
 236                 type1 == NL80211_IFTYPE_P2P_DEVICE ||
 237                 type2 == NL80211_IFTYPE_P2P_DEVICE ||
 238                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
 239                 (type1 == NL80211_IFTYPE_WDS &&
 240                         (type2 == NL80211_IFTYPE_WDS ||
 241                          type2 == NL80211_IFTYPE_AP)) ||
 242                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
 243                 (type1 == NL80211_IFTYPE_AP_VLAN &&
 244                         (type2 == NL80211_IFTYPE_AP ||
 245                          type2 == NL80211_IFTYPE_AP_VLAN));
 246 }
 247
 248 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
 249                                             enum nl80211_iftype iftype)
 250 {
 251         struct ieee80211_local *local = sdata->local;
 252         struct ieee80211_sub_if_data *nsdata;
 253         int ret;
 254
 255         ASSERT_RTNL();
 256
 257         /* we hold the RTNL here so can safely walk the list */
 258         list_for_each_entry(nsdata, &local->interfaces, list) {
 259                 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
 260                         /*
 261                          * Allow only a single IBSS interface to be up at any
 262                          * time. This is restricted because beacon distribution
 263                          * cannot work properly if both are in the same IBSS.
 264                          *
 265                          * To remove this restriction we'd have to disallow them
 266                          * from setting the same SSID on different IBSS interfaces
 267                          * belonging to the same hardware. Then, however, we're
 268                          * faced with having to adopt two different TSF timers...
 269                          */
 270                         if (iftype == NL80211_IFTYPE_ADHOC &&
 271                             nsdata->vif.type == NL80211_IFTYPE_ADHOC)
 272                                 return -EBUSY;
 273                         /*
 274                          * will not add another interface while any channel
 275                          * switch is active.
 276                          */
 277                         if (nsdata->vif.csa_active)
 278                                 return -EBUSY;
 279
 280                         /*
 281                          * The remaining checks are only performed for interfaces
 282                          * with the same MAC address.
 283                          */
 284                         if (!ether_addr_equal(sdata->vif.addr,
 285                                               nsdata->vif.addr))
 286                                 continue;
 287
 288                         /*
 289                          * check whether it may have the same address
 290                          */
 291                         if (!identical_mac_addr_allowed(iftype,
 292                                                         nsdata->vif.type))
 293                                 return -ENOTUNIQ;
 294
 295                         /*
 296                          * can only add VLANs to enabled APs
 297                          */
 298                         if (iftype == NL80211_IFTYPE_AP_VLAN &&
 299                             nsdata->vif.type == NL80211_IFTYPE_AP)
 300                                 sdata->bss = &nsdata->u.ap;
 301                 }
 302         }
 303
 304         mutex_lock(&local->chanctx_mtx);
 305         ret = ieee80211_check_combinations(sdata, NULL, 0, 0);
 306         mutex_unlock(&local->chanctx_mtx);
 307         return ret;
 308 }
 309
 310 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata,
 311                                   enum nl80211_iftype iftype)
 312 {
 313         int n_queues = sdata->local->hw.queues;
 314         int i;
 315
 316         if (iftype != NL80211_IFTYPE_P2P_DEVICE) {
 317                 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 318                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
 319                                          IEEE80211_INVAL_HW_QUEUE))
 320                                 return -EINVAL;
 321                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
 322                                          n_queues))
 323                                 return -EINVAL;
 324                 }
 325         }
 326
 327         if ((iftype != NL80211_IFTYPE_AP &&
 328              iftype != NL80211_IFTYPE_P2P_GO &&
 329              iftype != NL80211_IFTYPE_MESH_POINT) ||
 330             !(sdata->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)) {
 331                 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
 332                 return 0;
 333         }
 334
 335         if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
 336                 return -EINVAL;
 337
 338         if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
 339                 return -EINVAL;
 340
 341         return 0;
 342 }
 343
 344 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
 345                                     const int offset)
 346 {
 347         struct ieee80211_local *local = sdata->local;
 348         u32 flags = sdata->u.mntr_flags;
 349
 350 #define ADJUST(_f, _s)  do {                                    \
 351         if (flags & MONITOR_FLAG_##_f)                          \
 352                 local->fif_##_s += offset;                      \
 353         } while (0)
 354
 355         ADJUST(FCSFAIL, fcsfail);
 356         ADJUST(PLCPFAIL, plcpfail);
 357         ADJUST(CONTROL, control);
 358         ADJUST(CONTROL, pspoll);
 359         ADJUST(OTHER_BSS, other_bss);
 360
 361 #undef ADJUST
 362 }
 363
 364 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
 365 {
 366         struct ieee80211_local *local = sdata->local;
 367         int i;
 368
 369         for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 370                 if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
 371                         sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
 372                 else if (local->hw.queues >= IEEE80211_NUM_ACS)
 373                         sdata->vif.hw_queue[i] = i;
 374                 else
 375                         sdata->vif.hw_queue[i] = 0;
 376         }
 377         sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
 378 }
 379
 380 int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
 381 {
 382         struct ieee80211_sub_if_data *sdata;
 383         int ret;
 384
 385         if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
 386                 return 0;
 387
 388         ASSERT_RTNL();
 389
 390         if (local->monitor_sdata)
 391                 return 0;
 392
 393         sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
 394         if (!sdata)
 395                 return -ENOMEM;
 396
 397         /* set up data */
 398         sdata->local = local;
 399         sdata->vif.type = NL80211_IFTYPE_MONITOR;
 400         snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
 401                  wiphy_name(local->hw.wiphy));
 402         sdata->wdev.iftype = NL80211_IFTYPE_MONITOR;
 403
 404         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
 405
 406         ieee80211_set_default_queues(sdata);
 407
 408         ret = drv_add_interface(local, sdata);
 409         if (WARN_ON(ret)) {
 410                 /* ok .. stupid driver, it asked for this! */
 411                 kfree(sdata);
 412                 return ret;
 413         }
 414
 415         ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR);
 416         if (ret) {
 417                 kfree(sdata);
 418                 return ret;
 419         }
 420
 421         mutex_lock(&local->iflist_mtx);
 422         rcu_assign_pointer(local->monitor_sdata, sdata);
 423         mutex_unlock(&local->iflist_mtx);
 424
 425         mutex_lock(&local->mtx);
 426         ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef,
 427                                         IEEE80211_CHANCTX_EXCLUSIVE);
 428         mutex_unlock(&local->mtx);
 429         if (ret) {
 430                 mutex_lock(&local->iflist_mtx);
 431                 RCU_INIT_POINTER(local->monitor_sdata, NULL);
 432                 mutex_unlock(&local->iflist_mtx);
 433                 synchronize_net();
 434                 drv_remove_interface(local, sdata);
 435                 kfree(sdata);
 436                 return ret;
 437         }
 438
 439         return 0;
 440 }
 441
 442 void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
 443 {
 444         struct ieee80211_sub_if_data *sdata;
 445
 446         if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
 447                 return;
 448
 449         ASSERT_RTNL();
 450
 451         mutex_lock(&local->iflist_mtx);
 452
 453         sdata = rcu_dereference_protected(local->monitor_sdata,
 454                                           lockdep_is_held(&local->iflist_mtx));
 455         if (!sdata) {
 456                 mutex_unlock(&local->iflist_mtx);
 457                 return;
 458         }
 459
 460         RCU_INIT_POINTER(local->monitor_sdata, NULL);
 461         mutex_unlock(&local->iflist_mtx);
 462
 463         synchronize_net();
 464
 465         mutex_lock(&local->mtx);
 466         ieee80211_vif_release_channel(sdata);
 467         mutex_unlock(&local->mtx);
 468
 469         drv_remove_interface(local, sdata);
 470
 471         kfree(sdata);
 472 }
 473
 474 /*
 475  * NOTE: Be very careful when changing this function, it must NOT return
 476  * an error on interface type changes that have been pre-checked, so most
 477  * checks should be in ieee80211_check_concurrent_iface.
 478  */
 479 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
 480 {
 481         struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
 482         struct net_device *dev = wdev->netdev;
 483         struct ieee80211_local *local = sdata->local;
 484         struct sta_info *sta;
 485         u32 changed = 0;
 486         int res;
 487         u32 hw_reconf_flags = 0;
 488
 489         switch (sdata->vif.type) {
 490         case NL80211_IFTYPE_WDS:
 491                 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
 492                         return -ENOLINK;
 493                 break;
 494         case NL80211_IFTYPE_AP_VLAN: {
 495                 struct ieee80211_sub_if_data *master;
 496
 497                 if (!sdata->bss)
 498                         return -ENOLINK;
 499
 500                 mutex_lock(&local->mtx);
 501                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
 502                 mutex_unlock(&local->mtx);
 503
 504                 master = container_of(sdata->bss,
 505                                       struct ieee80211_sub_if_data, u.ap);
 506                 sdata->control_port_protocol =
 507                         master->control_port_protocol;
 508                 sdata->control_port_no_encrypt =
 509                         master->control_port_no_encrypt;
 510                 sdata->vif.cab_queue = master->vif.cab_queue;
 511                 memcpy(sdata->vif.hw_queue, master->vif.hw_queue,
 512                        sizeof(sdata->vif.hw_queue));
 513                 break;
 514                 }
 515         case NL80211_IFTYPE_AP:
 516                 sdata->bss = &sdata->u.ap;
 517                 break;
 518         case NL80211_IFTYPE_MESH_POINT:
 519         case NL80211_IFTYPE_STATION:
 520         case NL80211_IFTYPE_MONITOR:
 521         case NL80211_IFTYPE_ADHOC:
 522         case NL80211_IFTYPE_P2P_DEVICE:
 523                 /* no special treatment */
 524                 break;
 525         case NL80211_IFTYPE_UNSPECIFIED:
 526         case NUM_NL80211_IFTYPES:
 527         case NL80211_IFTYPE_P2P_CLIENT:
 528         case NL80211_IFTYPE_P2P_GO:
 529                 /* cannot happen */
 530                 WARN_ON(1);
 531                 break;
 532         }
 533
 534         if (local->open_count == 0) {
 535                 res = drv_start(local);
 536                 if (res)
 537                         goto err_del_bss;
 538                 /* we're brought up, everything changes */
 539                 hw_reconf_flags = ~0;
 540                 ieee80211_led_radio(local, true);
 541                 ieee80211_mod_tpt_led_trig(local,
 542                                            IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
 543         }
 544
 545         /*
 546          * Copy the hopefully now-present MAC address to
 547          * this interface, if it has the special null one.
 548          */
 549         if (dev && is_zero_ether_addr(dev->dev_addr)) {
 550                 memcpy(dev->dev_addr,
 551                        local->hw.wiphy->perm_addr,
 552                        ETH_ALEN);
 553                 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
 554
 555                 if (!is_valid_ether_addr(dev->dev_addr)) {
 556                         res = -EADDRNOTAVAIL;
 557                         goto err_stop;
 558                 }
 559         }
 560
 561         switch (sdata->vif.type) {
 562         case NL80211_IFTYPE_AP_VLAN:
 563                 /* no need to tell driver, but set carrier and chanctx */
 564                 if (rtnl_dereference(sdata->bss->beacon)) {
 565                         ieee80211_vif_vlan_copy_chanctx(sdata);
 566                         netif_carrier_on(dev);
 567                 } else {
 568                         netif_carrier_off(dev);
 569                 }
 570                 break;
 571         case NL80211_IFTYPE_MONITOR:
 572                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 573                         local->cooked_mntrs++;
 574                         break;
 575                 }
 576
 577                 if (sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE) {
 578                         res = drv_add_interface(local, sdata);
 579                         if (res)
 580                                 goto err_stop;
 581                 } else if (local->monitors == 0 && local->open_count == 0) {
 582                         res = ieee80211_add_virtual_monitor(local);
 583                         if (res)
 584                                 goto err_stop;
 585                 }
 586
 587                 /* must be before the call to ieee80211_configure_filter */
 588                 local->monitors++;
 589                 if (local->monitors == 1) {
 590                         local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
 591                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 592                 }
 593
 594                 ieee80211_adjust_monitor_flags(sdata, 1);
 595                 ieee80211_configure_filter(local);
 596                 mutex_lock(&local->mtx);
 597                 ieee80211_recalc_idle(local);
 598                 mutex_unlock(&local->mtx);
 599
 600                 netif_carrier_on(dev);
 601                 break;
 602         default:
 603                 if (coming_up) {
 604                         ieee80211_del_virtual_monitor(local);
 605
 606                         res = drv_add_interface(local, sdata);
 607                         if (res)
 608                                 goto err_stop;
 609                         res = ieee80211_check_queues(sdata,
 610                                 ieee80211_vif_type_p2p(&sdata->vif));
 611                         if (res)
 612                                 goto err_del_interface;
 613                 }
 614
 615                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
 616                         local->fif_pspoll++;
 617                         local->fif_probe_req++;
 618
 619                         ieee80211_configure_filter(local);
 620                 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 621                         local->fif_probe_req++;
 622                 }
 623
 624                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
 625                         changed |= ieee80211_reset_erp_info(sdata);
 626                 ieee80211_bss_info_change_notify(sdata, changed);
 627
 628                 switch (sdata->vif.type) {
 629                 case NL80211_IFTYPE_STATION:
 630                 case NL80211_IFTYPE_ADHOC:
 631                 case NL80211_IFTYPE_AP:
 632                 case NL80211_IFTYPE_MESH_POINT:
 633                         netif_carrier_off(dev);
 634                         break;
 635                 case NL80211_IFTYPE_WDS:
 636                 case NL80211_IFTYPE_P2P_DEVICE:
 637                         break;
 638                 default:
 639                         /* not reached */
 640                         WARN_ON(1);
 641                 }
 642
 643                 /*
 644                  * set default queue parameters so drivers don't
 645                  * need to initialise the hardware if the hardware
 646                  * doesn't start up with sane defaults
 647                  */
 648                 ieee80211_set_wmm_default(sdata, true);
 649         }
 650
 651         set_bit(SDATA_STATE_RUNNING, &sdata->state);
 652
 653         if (sdata->vif.type == NL80211_IFTYPE_WDS) {
 654                 /* Create STA entry for the WDS peer */
 655                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
 656                                      GFP_KERNEL);
 657                 if (!sta) {
 658                         res = -ENOMEM;
 659                         goto err_del_interface;
 660                 }
 661
 662                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
 663                 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
 664                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
 665
 666                 res = sta_info_insert(sta);
 667                 if (res) {
 668                         /* STA has been freed */
 669                         goto err_del_interface;
 670                 }
 671
 672                 rate_control_rate_init(sta);
 673                 netif_carrier_on(dev);
 674         } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
 675                 rcu_assign_pointer(local->p2p_sdata, sdata);
 676         }
 677
 678         /*
 679          * set_multicast_list will be invoked by the networking core
 680          * which will check whether any increments here were done in
 681          * error and sync them down to the hardware as filter flags.
 682          */
 683         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 684                 atomic_inc(&local->iff_allmultis);
 685
 686         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 687                 atomic_inc(&local->iff_promiscs);
 688
 689         if (coming_up)
 690                 local->open_count++;
 691
 692         if (hw_reconf_flags)
 693                 ieee80211_hw_config(local, hw_reconf_flags);
 694
 695         ieee80211_recalc_ps(local, -1);
 696
 697         if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
 698             sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 699                 /* XXX: for AP_VLAN, actually track AP queues */
 700                 netif_tx_start_all_queues(dev);
 701         } else if (dev) {
 702                 unsigned long flags;
 703                 int n_acs = IEEE80211_NUM_ACS;
 704                 int ac;
 705
 706                 if (local->hw.queues < IEEE80211_NUM_ACS)
 707                         n_acs = 1;
 708
 709                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 710                 if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE ||
 711                     (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 &&
 712                      skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) {
 713                         for (ac = 0; ac < n_acs; ac++) {
 714                                 int ac_queue = sdata->vif.hw_queue[ac];
 715
 716                                 if (local->queue_stop_reasons[ac_queue] == 0 &&
 717                                     skb_queue_empty(&local->pending[ac_queue]))
 718                                         netif_start_subqueue(dev, ac);
 719                         }
 720                 }
 721                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 722         }
 723
 724         return 0;
 725  err_del_interface:
 726         drv_remove_interface(local, sdata);
 727  err_stop:
 728         if (!local->open_count)
 729                 drv_stop(local);
 730  err_del_bss:
 731         sdata->bss = NULL;
 732         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 733                 mutex_lock(&local->mtx);
 734                 list_del(&sdata->u.vlan.list);
 735                 mutex_unlock(&local->mtx);
 736         }
 737         /* might already be clear but that doesn't matter */
 738         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 739         return res;
 740 }
 741
 742 static int ieee80211_open(struct net_device *dev)
 743 {
 744         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 745         int err;
 746
 747         /* fail early if user set an invalid address */
 748         if (!is_valid_ether_addr(dev->dev_addr))
 749                 return -EADDRNOTAVAIL;
 750
 751         err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
 752         if (err)
 753                 return err;
 754
 755         return ieee80211_do_open(&sdata->wdev, true);
 756 }
 757
 758 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
 759                               bool going_down)
 760 {
 761         struct ieee80211_local *local = sdata->local;
 762         unsigned long flags;
 763         struct sk_buff *skb, *tmp;
 764         u32 hw_reconf_flags = 0;
 765         int i, flushed;
 766         struct ps_data *ps;
 767         struct cfg80211_chan_def chandef;
 768
 769         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 770
 771         if (rcu_access_pointer(local->scan_sdata) == sdata)
 772                 ieee80211_scan_cancel(local);
 773
 774         /*
 775          * Stop TX on this interface first.
 776          */
 777         if (sdata->dev)
 778                 netif_tx_stop_all_queues(sdata->dev);
 779
 780         ieee80211_roc_purge(local, sdata);
 781
 782         switch (sdata->vif.type) {
 783         case NL80211_IFTYPE_STATION:
 784                 ieee80211_mgd_stop(sdata);
 785                 break;
 786         case NL80211_IFTYPE_ADHOC:
 787                 ieee80211_ibss_stop(sdata);
 788                 break;
 789         case NL80211_IFTYPE_AP:
 790                 cancel_work_sync(&sdata->u.ap.request_smps_work);
 791                 break;
 792         default:
 793                 break;
 794         }
 795
 796         /*
 797          * Remove all stations associated with this interface.
 798          *
 799          * This must be done before calling ops->remove_interface()
 800          * because otherwise we can later invoke ops->sta_notify()
 801          * whenever the STAs are removed, and that invalidates driver
 802          * assumptions about always getting a vif pointer that is valid
 803          * (because if we remove a STA after ops->remove_interface()
 804          * the driver will have removed the vif info already!)
 805          *
 806          * This is relevant only in WDS mode, in all other modes we've
 807          * already removed all stations when disconnecting or similar,
 808          * so warn otherwise.
 809          */
 810         flushed = sta_info_flush(sdata);
 811         WARN_ON_ONCE((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) ||
 812                      (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1));
 813
 814         /* don't count this interface for promisc/allmulti while it is down */
 815         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 816                 atomic_dec(&local->iff_allmultis);
 817
 818         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 819                 atomic_dec(&local->iff_promiscs);
 820
 821         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 822                 local->fif_pspoll--;
 823                 local->fif_probe_req--;
 824         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 825                 local->fif_probe_req--;
 826         }
 827
 828         if (sdata->dev) {
 829                 netif_addr_lock_bh(sdata->dev);
 830                 spin_lock_bh(&local->filter_lock);
 831                 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
 832                                  sdata->dev->addr_len);
 833                 spin_unlock_bh(&local->filter_lock);
 834                 netif_addr_unlock_bh(sdata->dev);
 835         }
 836
 837         del_timer_sync(&local->dynamic_ps_timer);
 838         cancel_work_sync(&local->dynamic_ps_enable_work);
 839
 840         cancel_work_sync(&sdata->recalc_smps);
 841         sdata_lock(sdata);
 842         mutex_lock(&local->mtx);
 843         sdata->vif.csa_active = false;
 844         if (sdata->csa_block_tx) {
 845                 ieee80211_wake_vif_queues(local, sdata,
 846                                           IEEE80211_QUEUE_STOP_REASON_CSA);
 847                 sdata->csa_block_tx = false;
 848         }
 849         mutex_unlock(&local->mtx);
 850         sdata_unlock(sdata);
 851
 852         cancel_work_sync(&sdata->csa_finalize_work);
 853
 854         cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
 855
 856         if (sdata->wdev.cac_started) {
 857                 chandef = sdata->vif.bss_conf.chandef;
 858                 WARN_ON(local->suspended);
 859                 mutex_lock(&local->mtx);
 860                 ieee80211_vif_release_channel(sdata);
 861                 mutex_unlock(&local->mtx);
 862                 cfg80211_cac_event(sdata->dev, &chandef,
 863                                    NL80211_RADAR_CAC_ABORTED,
 864                                    GFP_KERNEL);
 865         }
 866
 867         /* APs need special treatment */
 868         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 869                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
 870
 871                 /* down all dependent devices, that is VLANs */
 872                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
 873                                          u.vlan.list)
 874                         dev_close(vlan->dev);
 875                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
 876         } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 877                 /* remove all packets in parent bc_buf pointing to this dev */
 878                 ps = &sdata->bss->ps;
 879
 880                 spin_lock_irqsave(&ps->bc_buf.lock, flags);
 881                 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
 882                         if (skb->dev == sdata->dev) {
 883                                 __skb_unlink(skb, &ps->bc_buf);
 884                                 local->total_ps_buffered--;
 885                                 ieee80211_free_txskb(&local->hw, skb);
 886                         }
 887                 }
 888                 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
 889         }
 890
 891         if (going_down)
 892                 local->open_count--;
 893
 894         switch (sdata->vif.type) {
 895         case NL80211_IFTYPE_AP_VLAN:
 896                 mutex_lock(&local->mtx);
 897                 list_del(&sdata->u.vlan.list);
 898                 mutex_unlock(&local->mtx);
 899                 RCU_INIT_POINTER(sdata->vif.chanctx_conf, NULL);
 900                 /* no need to tell driver */
 901                 break;
 902         case NL80211_IFTYPE_MONITOR:
 903                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 904                         local->cooked_mntrs--;
 905                         break;
 906                 }
 907
 908                 local->monitors--;
 909                 if (local->monitors == 0) {
 910                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
 911                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 912                 }
 913
 914                 ieee80211_adjust_monitor_flags(sdata, -1);
 915                 break;
 916         case NL80211_IFTYPE_P2P_DEVICE:
 917                 /* relies on synchronize_rcu() below */
 918                 RCU_INIT_POINTER(local->p2p_sdata, NULL);
 919                 /* fall through */
 920         default:
 921                 cancel_work_sync(&sdata->work);
 922                 /*
 923                  * When we get here, the interface is marked down.
 924                  * Free the remaining keys, if there are any
 925                  * (shouldn't be, except maybe in WDS mode?)
 926                  *
 927                  * Force the key freeing to always synchronize_net()
 928                  * to wait for the RX path in case it is using this
 929                  * interface enqueuing frames * at this very time on
 930                  * another CPU.
 931                  */
 932                 ieee80211_free_keys(sdata, true);
 933
 934                 /* fall through */
 935         case NL80211_IFTYPE_AP:
 936                 skb_queue_purge(&sdata->skb_queue);
 937         }
 938
 939         sdata->bss = NULL;
 940
 941         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 942         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 943                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
 944                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 945                         if (info->control.vif == &sdata->vif) {
 946                                 __skb_unlink(skb, &local->pending[i]);
 947                                 ieee80211_free_txskb(&local->hw, skb);
 948                         }
 949                 }
 950         }
 951         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 952
 953         if (local->open_count == 0)
 954                 ieee80211_clear_tx_pending(local);
 955
 956         /*
 957          * If the interface goes down while suspended, presumably because
 958          * the device was unplugged and that happens before our resume,
 959          * then the driver is already unconfigured and the remainder of
 960          * this function isn't needed.
 961          * XXX: what about WoWLAN? If the device has software state, e.g.
 962          *      memory allocated, it might expect teardown commands from
 963          *      mac80211 here?
 964          */
 965         if (local->suspended) {
 966                 WARN_ON(local->wowlan);
 967                 WARN_ON(rtnl_dereference(local->monitor_sdata));
 968                 return;
 969         }
 970
 971         switch (sdata->vif.type) {
 972         case NL80211_IFTYPE_AP_VLAN:
 973                 break;
 974         case NL80211_IFTYPE_MONITOR:
 975                 if (local->monitors == 0)
 976                         ieee80211_del_virtual_monitor(local);
 977
 978                 mutex_lock(&local->mtx);
 979                 ieee80211_recalc_idle(local);
 980                 mutex_unlock(&local->mtx);
 981
 982                 if (!(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE))
 983                         break;
 984
 985                 /* fall through */
 986         default:
 987                 if (going_down)
 988                         drv_remove_interface(local, sdata);
 989         }
 990
 991         ieee80211_recalc_ps(local, -1);
 992
 993         if (local->open_count == 0) {
 994                 ieee80211_stop_device(local);
 995
 996                 /* no reconfiguring after stop! */
 997                 return;
 998         }
 999
1000         /* do after stop to avoid reconfiguring when we stop anyway */
1001         ieee80211_configure_filter(local);
1002         ieee80211_hw_config(local, hw_reconf_flags);
1003
1004         if (local->monitors == local->open_count)
1005                 ieee80211_add_virtual_monitor(local);
1006 }
1007
1008 static int ieee80211_stop(struct net_device *dev)
1009 {
1010         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1011
1012         ieee80211_do_stop(sdata, true);
1013
1014         return 0;
1015 }
1016
1017 static void ieee80211_set_multicast_list(struct net_device *dev)
1018 {
1019         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1020         struct ieee80211_local *local = sdata->local;
1021         int allmulti, promisc, sdata_allmulti, sdata_promisc;
1022
1023         allmulti = !!(dev->flags & IFF_ALLMULTI);
1024         promisc = !!(dev->flags & IFF_PROMISC);
1025         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
1026         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
1027
1028         if (allmulti != sdata_allmulti) {
1029                 if (dev->flags & IFF_ALLMULTI)
1030                         atomic_inc(&local->iff_allmultis);
1031                 else
1032                         atomic_dec(&local->iff_allmultis);
1033                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
1034         }
1035
1036         if (promisc != sdata_promisc) {
1037                 if (dev->flags & IFF_PROMISC)
1038                         atomic_inc(&local->iff_promiscs);
1039                 else
1040                         atomic_dec(&local->iff_promiscs);
1041                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
1042         }
1043         spin_lock_bh(&local->filter_lock);
1044         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
1045         spin_unlock_bh(&local->filter_lock);
1046         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
1047 }
1048
1049 /*
1050  * Called when the netdev is removed or, by the code below, before
1051  * the interface type changes.
1052  */
1053 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
1054 {
1055         int i;
1056
1057         /* free extra data */
1058         ieee80211_free_keys(sdata, false);
1059
1060         ieee80211_debugfs_remove_netdev(sdata);
1061
1062         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1063                 __skb_queue_purge(&sdata->fragments[i].skb_list);
1064         sdata->fragment_next = 0;
1065
1066         if (ieee80211_vif_is_mesh(&sdata->vif))
1067                 mesh_rmc_free(sdata);
1068 }
1069
1070 static void ieee80211_uninit(struct net_device *dev)
1071 {
1072         ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
1073 }
1074
1075 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
1076                                          struct sk_buff *skb,
1077                                          void *accel_priv,
1078                                          select_queue_fallback_t fallback)
1079 {
1080         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
1081 }
1082
1083 static const struct net_device_ops ieee80211_dataif_ops = {
1084         .ndo_open               = ieee80211_open,
1085         .ndo_stop               = ieee80211_stop,
1086         .ndo_uninit             = ieee80211_uninit,
1087         .ndo_start_xmit         = ieee80211_subif_start_xmit,
1088         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1089         .ndo_change_mtu         = ieee80211_change_mtu,
1090         .ndo_set_mac_address    = ieee80211_change_mac,
1091         .ndo_select_queue       = ieee80211_netdev_select_queue,
1092 };
1093
1094 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
1095                                           struct sk_buff *skb,
1096                                           void *accel_priv,
1097                                           select_queue_fallback_t fallback)
1098 {
1099         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1100         struct ieee80211_local *local = sdata->local;
1101         struct ieee80211_hdr *hdr;
1102         struct ieee80211_radiotap_header *rtap = (void *)skb->data;
1103
1104         if (local->hw.queues < IEEE80211_NUM_ACS)
1105                 return 0;
1106
1107         if (skb->len < 4 ||
1108             skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
1109                 return 0; /* doesn't matter, frame will be dropped */
1110
1111         hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
1112
1113         return ieee80211_select_queue_80211(sdata, skb, hdr);
1114 }
1115
1116 static const struct net_device_ops ieee80211_monitorif_ops = {
1117         .ndo_open               = ieee80211_open,
1118         .ndo_stop               = ieee80211_stop,
1119         .ndo_uninit             = ieee80211_uninit,
1120         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
1121         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1122         .ndo_change_mtu         = ieee80211_change_mtu,
1123         .ndo_set_mac_address    = ieee80211_change_mac,
1124         .ndo_select_queue       = ieee80211_monitor_select_queue,
1125 };
1126
1127 static void ieee80211_if_setup(struct net_device *dev)
1128 {
1129         ether_setup(dev);
1130         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1131         dev->netdev_ops = &ieee80211_dataif_ops;
1132         dev->destructor = free_netdev;
1133 }
1134
1135 static void ieee80211_iface_work(struct work_struct *work)
1136 {
1137         struct ieee80211_sub_if_data *sdata =
1138                 container_of(work, struct ieee80211_sub_if_data, work);
1139         struct ieee80211_local *local = sdata->local;
1140         struct sk_buff *skb;
1141         struct sta_info *sta;
1142         struct ieee80211_ra_tid *ra_tid;
1143         struct ieee80211_rx_agg *rx_agg;
1144
1145         if (!ieee80211_sdata_running(sdata))
1146                 return;
1147
1148         if (local->scanning)
1149                 return;
1150
1151         /*
1152          * ieee80211_queue_work() should have picked up most cases,
1153          * here we'll pick the rest.
1154          */
1155         if (WARN(local->suspended,
1156                  "interface work scheduled while going to suspend\n"))
1157                 return;
1158
1159         /* first process frames */
1160         while ((skb = skb_dequeue(&sdata->skb_queue))) {
1161                 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1162
1163                 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
1164                         ra_tid = (void *)&skb->cb;
1165                         ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
1166                                                  ra_tid->tid);
1167                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
1168                         ra_tid = (void *)&skb->cb;
1169                         ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
1170                                                 ra_tid->tid);
1171                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_RX_AGG_START) {
1172                         rx_agg = (void *)&skb->cb;
1173                         mutex_lock(&local->sta_mtx);
1174                         sta = sta_info_get_bss(sdata, rx_agg->addr);
1175                         if (sta) {
1176                                 u16 last_seq;
1177
1178                                 last_seq = IEEE80211_SEQ_TO_SN(le16_to_cpu(
1179                                         sta->last_seq_ctrl[rx_agg->tid]));
1180
1181                                 __ieee80211_start_rx_ba_session(sta,
1182                                                 0, 0,
1183                                                 ieee80211_sn_inc(last_seq),
1184                                                 1, rx_agg->tid,
1185                                                 IEEE80211_MAX_AMPDU_BUF,
1186                                                 false);
1187                         }
1188                         mutex_unlock(&local->sta_mtx);
1189                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_RX_AGG_STOP) {
1190                         rx_agg = (void *)&skb->cb;
1191                         mutex_lock(&local->sta_mtx);
1192                         sta = sta_info_get_bss(sdata, rx_agg->addr);
1193                         if (sta)
1194                                 __ieee80211_stop_rx_ba_session(sta,
1195                                                         rx_agg->tid,
1196                                                         WLAN_BACK_RECIPIENT, 0,
1197                                                         false);
1198                         mutex_unlock(&local->sta_mtx);
1199                 } else if (ieee80211_is_action(mgmt->frame_control) &&
1200                            mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1201                         int len = skb->len;
1202
1203                         mutex_lock(&local->sta_mtx);
1204                         sta = sta_info_get_bss(sdata, mgmt->sa);
1205                         if (sta) {
1206                                 switch (mgmt->u.action.u.addba_req.action_code) {
1207                                 case WLAN_ACTION_ADDBA_REQ:
1208                                         ieee80211_process_addba_request(
1209                                                         local, sta, mgmt, len);
1210                                         break;
1211                                 case WLAN_ACTION_ADDBA_RESP:
1212                                         ieee80211_process_addba_resp(local, sta,
1213                                                                      mgmt, len);
1214                                         break;
1215                                 case WLAN_ACTION_DELBA:
1216                                         ieee80211_process_delba(sdata, sta,
1217                                                                 mgmt, len);
1218                                         break;
1219                                 default:
1220                                         WARN_ON(1);
1221                                         break;
1222                                 }
1223                         }
1224                         mutex_unlock(&local->sta_mtx);
1225                 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1226                         struct ieee80211_hdr *hdr = (void *)mgmt;
1227                         /*
1228                          * So the frame isn't mgmt, but frame_control
1229                          * is at the right place anyway, of course, so
1230                          * the if statement is correct.
1231                          *
1232                          * Warn if we have other data frame types here,
1233                          * they must not get here.
1234                          */
1235                         WARN_ON(hdr->frame_control &
1236                                         cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1237                         WARN_ON(!(hdr->seq_ctrl &
1238                                         cpu_to_le16(IEEE80211_SCTL_FRAG)));
1239                         /*
1240                          * This was a fragment of a frame, received while
1241                          * a block-ack session was active. That cannot be
1242                          * right, so terminate the session.
1243                          */
1244                         mutex_lock(&local->sta_mtx);
1245                         sta = sta_info_get_bss(sdata, mgmt->sa);
1246                         if (sta) {
1247                                 u16 tid = *ieee80211_get_qos_ctl(hdr) &
1248                                                 IEEE80211_QOS_CTL_TID_MASK;
1249
1250                                 __ieee80211_stop_rx_ba_session(
1251                                         sta, tid, WLAN_BACK_RECIPIENT,
1252                                         WLAN_REASON_QSTA_REQUIRE_SETUP,
1253                                         true);
1254                         }
1255                         mutex_unlock(&local->sta_mtx);
1256                 } else switch (sdata->vif.type) {
1257                 case NL80211_IFTYPE_STATION:
1258                         ieee80211_sta_rx_queued_mgmt(sdata, skb);
1259                         break;
1260                 case NL80211_IFTYPE_ADHOC:
1261                         ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1262                         break;
1263                 case NL80211_IFTYPE_MESH_POINT:
1264                         if (!ieee80211_vif_is_mesh(&sdata->vif))
1265                                 break;
1266                         ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1267                         break;
1268                 default:
1269                         WARN(1, "frame for unexpected interface type");
1270                         break;
1271                 }
1272
1273                 kfree_skb(skb);
1274         }
1275
1276         /* then other type-dependent work */
1277         switch (sdata->vif.type) {
1278         case NL80211_IFTYPE_STATION:
1279                 ieee80211_sta_work(sdata);
1280                 break;
1281         case NL80211_IFTYPE_ADHOC:
1282                 ieee80211_ibss_work(sdata);
1283                 break;
1284         case NL80211_IFTYPE_MESH_POINT:
1285                 if (!ieee80211_vif_is_mesh(&sdata->vif))
1286                         break;
1287                 ieee80211_mesh_work(sdata);
1288                 break;
1289         default:
1290                 break;
1291         }
1292 }
1293
1294 static void ieee80211_recalc_smps_work(struct work_struct *work)
1295 {
1296         struct ieee80211_sub_if_data *sdata =
1297                 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1298
1299         ieee80211_recalc_smps(sdata);
1300 }
1301
1302 /*
1303  * Helper function to initialise an interface to a specific type.
1304  */
1305 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1306                                   enum nl80211_iftype type)
1307 {
1308         /* clear type-dependent union */
1309         memset(&sdata->u, 0, sizeof(sdata->u));
1310
1311         /* and set some type-dependent values */
1312         sdata->vif.type = type;
1313         sdata->vif.p2p = false;
1314         sdata->wdev.iftype = type;
1315
1316         sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1317         sdata->control_port_no_encrypt = false;
1318         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1319         sdata->vif.bss_conf.idle = true;
1320
1321         sdata->noack_map = 0;
1322
1323         /* only monitor/p2p-device differ */
1324         if (sdata->dev) {
1325                 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1326                 sdata->dev->type = ARPHRD_ETHER;
1327         }
1328
1329         skb_queue_head_init(&sdata->skb_queue);
1330         INIT_WORK(&sdata->work, ieee80211_iface_work);
1331         INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1332         INIT_WORK(&sdata->csa_finalize_work, ieee80211_csa_finalize_work);
1333         INIT_LIST_HEAD(&sdata->assigned_chanctx_list);
1334         INIT_LIST_HEAD(&sdata->reserved_chanctx_list);
1335
1336         switch (type) {
1337         case NL80211_IFTYPE_P2P_GO:
1338                 type = NL80211_IFTYPE_AP;
1339                 sdata->vif.type = type;
1340                 sdata->vif.p2p = true;
1341                 /* fall through */
1342         case NL80211_IFTYPE_AP:
1343                 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1344                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1345                 INIT_WORK(&sdata->u.ap.request_smps_work,
1346                           ieee80211_request_smps_ap_work);
1347                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1348                 sdata->u.ap.req_smps = IEEE80211_SMPS_OFF;
1349                 break;
1350         case NL80211_IFTYPE_P2P_CLIENT:
1351                 type = NL80211_IFTYPE_STATION;
1352                 sdata->vif.type = type;
1353                 sdata->vif.p2p = true;
1354                 /* fall through */
1355         case NL80211_IFTYPE_STATION:
1356                 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1357                 ieee80211_sta_setup_sdata(sdata);
1358                 break;
1359         case NL80211_IFTYPE_ADHOC:
1360                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1361                 ieee80211_ibss_setup_sdata(sdata);
1362                 break;
1363         case NL80211_IFTYPE_MESH_POINT:
1364                 if (ieee80211_vif_is_mesh(&sdata->vif))
1365                         ieee80211_mesh_init_sdata(sdata);
1366                 break;
1367         case NL80211_IFTYPE_MONITOR:
1368                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1369                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1370                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
1371                                       MONITOR_FLAG_OTHER_BSS;
1372                 break;
1373         case NL80211_IFTYPE_WDS:
1374                 sdata->vif.bss_conf.bssid = NULL;
1375                 break;
1376         case NL80211_IFTYPE_AP_VLAN:
1377         case NL80211_IFTYPE_P2P_DEVICE:
1378                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1379                 break;
1380         case NL80211_IFTYPE_UNSPECIFIED:
1381         case NUM_NL80211_IFTYPES:
1382                 BUG();
1383                 break;
1384         }
1385
1386         ieee80211_debugfs_add_netdev(sdata);
1387 }
1388
1389 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1390                                            enum nl80211_iftype type)
1391 {
1392         struct ieee80211_local *local = sdata->local;
1393         int ret, err;
1394         enum nl80211_iftype internal_type = type;
1395         bool p2p = false;
1396
1397         ASSERT_RTNL();
1398
1399         if (!local->ops->change_interface)
1400                 return -EBUSY;
1401
1402         switch (sdata->vif.type) {
1403         case NL80211_IFTYPE_AP:
1404         case NL80211_IFTYPE_STATION:
1405         case NL80211_IFTYPE_ADHOC:
1406                 /*
1407                  * Could maybe also all others here?
1408                  * Just not sure how that interacts
1409                  * with the RX/config path e.g. for
1410                  * mesh.
1411                  */
1412                 break;
1413         default:
1414                 return -EBUSY;
1415         }
1416
1417         switch (type) {
1418         case NL80211_IFTYPE_AP:
1419         case NL80211_IFTYPE_STATION:
1420         case NL80211_IFTYPE_ADHOC:
1421                 /*
1422                  * Could probably support everything
1423                  * but WDS here (WDS do_open can fail
1424                  * under memory pressure, which this
1425                  * code isn't prepared to handle).
1426                  */
1427                 break;
1428         case NL80211_IFTYPE_P2P_CLIENT:
1429                 p2p = true;
1430                 internal_type = NL80211_IFTYPE_STATION;
1431                 break;
1432         case NL80211_IFTYPE_P2P_GO:
1433                 p2p = true;
1434                 internal_type = NL80211_IFTYPE_AP;
1435                 break;
1436         default:
1437                 return -EBUSY;
1438         }
1439
1440         ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1441         if (ret)
1442                 return ret;
1443
1444         ieee80211_do_stop(sdata, false);
1445
1446         ieee80211_teardown_sdata(sdata);
1447
1448         ret = drv_change_interface(local, sdata, internal_type, p2p);
1449         if (ret)
1450                 type = ieee80211_vif_type_p2p(&sdata->vif);
1451
1452         /*
1453          * Ignore return value here, there's not much we can do since
1454          * the driver changed the interface type internally already.
1455          * The warnings will hopefully make driver authors fix it :-)
1456          */
1457         ieee80211_check_queues(sdata, type);
1458
1459         ieee80211_setup_sdata(sdata, type);
1460
1461         err = ieee80211_do_open(&sdata->wdev, false);
1462         WARN(err, "type change: do_open returned %d", err);
1463
1464         return ret;
1465 }
1466
1467 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1468                              enum nl80211_iftype type)
1469 {
1470         int ret;
1471
1472         ASSERT_RTNL();
1473
1474         if (type == ieee80211_vif_type_p2p(&sdata->vif))
1475                 return 0;
1476
1477         if (ieee80211_sdata_running(sdata)) {
1478                 ret = ieee80211_runtime_change_iftype(sdata, type);
1479                 if (ret)
1480                         return ret;
1481         } else {
1482                 /* Purge and reset type-dependent state. */
1483                 ieee80211_teardown_sdata(sdata);
1484                 ieee80211_setup_sdata(sdata, type);
1485         }
1486
1487         /* reset some values that shouldn't be kept across type changes */
1488         sdata->drop_unencrypted = 0;
1489         if (type == NL80211_IFTYPE_STATION)
1490                 sdata->u.mgd.use_4addr = false;
1491
1492         return 0;
1493 }
1494
1495 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1496                                        u8 *perm_addr, enum nl80211_iftype type)
1497 {
1498         struct ieee80211_sub_if_data *sdata;
1499         u64 mask, start, addr, val, inc;
1500         u8 *m;
1501         u8 tmp_addr[ETH_ALEN];
1502         int i;
1503
1504         /* default ... something at least */
1505         memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1506
1507         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1508             local->hw.wiphy->n_addresses <= 1)
1509                 return;
1510
1511         mutex_lock(&local->iflist_mtx);
1512
1513         switch (type) {
1514         case NL80211_IFTYPE_MONITOR:
1515                 /* doesn't matter */
1516                 break;
1517         case NL80211_IFTYPE_WDS:
1518         case NL80211_IFTYPE_AP_VLAN:
1519                 /* match up with an AP interface */
1520                 list_for_each_entry(sdata, &local->interfaces, list) {
1521                         if (sdata->vif.type != NL80211_IFTYPE_AP)
1522                                 continue;
1523                         memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1524                         break;
1525                 }
1526                 /* keep default if no AP interface present */
1527                 break;
1528         case NL80211_IFTYPE_P2P_CLIENT:
1529         case NL80211_IFTYPE_P2P_GO:
1530                 if (local->hw.flags & IEEE80211_HW_P2P_DEV_ADDR_FOR_INTF) {
1531                         list_for_each_entry(sdata, &local->interfaces, list) {
1532                                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1533                                         continue;
1534                                 if (!ieee80211_sdata_running(sdata))
1535                                         continue;
1536                                 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1537                                 goto out_unlock;
1538                         }
1539                 }
1540                 /* otherwise fall through */
1541         default:
1542                 /* assign a new address if possible -- try n_addresses first */
1543                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1544                         bool used = false;
1545
1546                         list_for_each_entry(sdata, &local->interfaces, list) {
1547                                 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr,
1548                                                      sdata->vif.addr)) {
1549                                         used = true;
1550                                         break;
1551                                 }
1552                         }
1553
1554                         if (!used) {
1555                                 memcpy(perm_addr,
1556                                        local->hw.wiphy->addresses[i].addr,
1557                                        ETH_ALEN);
1558                                 break;
1559                         }
1560                 }
1561
1562                 /* try mask if available */
1563                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1564                         break;
1565
1566                 m = local->hw.wiphy->addr_mask;
1567                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1568                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1569                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1570
1571                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1572                         /* not a contiguous mask ... not handled now! */
1573                         pr_info("not contiguous\n");
1574                         break;
1575                 }
1576
1577                 /*
1578                  * Pick address of existing interface in case user changed
1579                  * MAC address manually, default to perm_addr.
1580                  */
1581                 m = local->hw.wiphy->perm_addr;
1582                 list_for_each_entry(sdata, &local->interfaces, list) {
1583                         if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
1584                                 continue;
1585                         m = sdata->vif.addr;
1586                         break;
1587                 }
1588                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1589                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1590                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1591
1592                 inc = 1ULL<<__ffs64(mask);
1593                 val = (start & mask);
1594                 addr = (start & ~mask) | (val & mask);
1595                 do {
1596                         bool used = false;
1597
1598                         tmp_addr[5] = addr >> 0*8;
1599                         tmp_addr[4] = addr >> 1*8;
1600                         tmp_addr[3] = addr >> 2*8;
1601                         tmp_addr[2] = addr >> 3*8;
1602                         tmp_addr[1] = addr >> 4*8;
1603                         tmp_addr[0] = addr >> 5*8;
1604
1605                         val += inc;
1606
1607                         list_for_each_entry(sdata, &local->interfaces, list) {
1608                                 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) {
1609                                         used = true;
1610                                         break;
1611                                 }
1612                         }
1613
1614                         if (!used) {
1615                                 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1616                                 break;
1617                         }
1618                         addr = (start & ~mask) | (val & mask);
1619                 } while (addr != start);
1620
1621                 break;
1622         }
1623
1624  out_unlock:
1625         mutex_unlock(&local->iflist_mtx);
1626 }
1627
1628 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1629                      struct wireless_dev **new_wdev, enum nl80211_iftype type,
1630                      struct vif_params *params)
1631 {
1632         struct net_device *ndev = NULL;
1633         struct ieee80211_sub_if_data *sdata = NULL;
1634         int ret, i;
1635         int txqs = 1;
1636
1637         ASSERT_RTNL();
1638
1639         if (type == NL80211_IFTYPE_P2P_DEVICE) {
1640                 struct wireless_dev *wdev;
1641
1642                 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1643                                 GFP_KERNEL);
1644                 if (!sdata)
1645                         return -ENOMEM;
1646                 wdev = &sdata->wdev;
1647
1648                 sdata->dev = NULL;
1649                 strlcpy(sdata->name, name, IFNAMSIZ);
1650                 ieee80211_assign_perm_addr(local, wdev->address, type);
1651                 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1652         } else {
1653                 if (local->hw.queues >= IEEE80211_NUM_ACS)
1654                         txqs = IEEE80211_NUM_ACS;
1655
1656                 ndev = alloc_netdev_mqs(sizeof(*sdata) + local->hw.vif_data_size,
1657                                         name, NET_NAME_UNKNOWN,
1658                                         ieee80211_if_setup, txqs, 1);
1659                 if (!ndev)
1660                         return -ENOMEM;
1661                 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1662
1663                 ndev->needed_headroom = local->tx_headroom +
1664                                         4*6 /* four MAC addresses */
1665                                         + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1666                                         + 6 /* mesh */
1667                                         + 8 /* rfc1042/bridge tunnel */
1668                                         - ETH_HLEN /* ethernet hard_header_len */
1669                                         + IEEE80211_ENCRYPT_HEADROOM;
1670                 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1671
1672                 ret = dev_alloc_name(ndev, ndev->name);
1673                 if (ret < 0) {
1674                         free_netdev(ndev);
1675                         return ret;
1676                 }
1677
1678                 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1679                 memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1680                 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1681
1682                 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1683                 sdata = netdev_priv(ndev);
1684                 ndev->ieee80211_ptr = &sdata->wdev;
1685                 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1686                 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1687
1688                 sdata->dev = ndev;
1689         }
1690
1691         /* initialise type-independent data */
1692         sdata->wdev.wiphy = local->hw.wiphy;
1693         sdata->local = local;
1694
1695         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1696                 skb_queue_head_init(&sdata->fragments[i].skb_list);
1697
1698         INIT_LIST_HEAD(&sdata->key_list);
1699
1700         INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
1701                           ieee80211_dfs_cac_timer_work);
1702         INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
1703                           ieee80211_delayed_tailroom_dec);
1704
1705         for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1706                 struct ieee80211_supported_band *sband;
1707                 sband = local->hw.wiphy->bands[i];
1708                 sdata->rc_rateidx_mask[i] =
1709                         sband ? (1 << sband->n_bitrates) - 1 : 0;
1710                 if (sband)
1711                         memcpy(sdata->rc_rateidx_mcs_mask[i],
1712                                sband->ht_cap.mcs.rx_mask,
1713                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1714                 else
1715                         memset(sdata->rc_rateidx_mcs_mask[i], 0,
1716                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1717         }
1718
1719         ieee80211_set_default_queues(sdata);
1720
1721         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1722         sdata->user_power_level = local->user_power_level;
1723
1724         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1725
1726         /* setup type-dependent data */
1727         ieee80211_setup_sdata(sdata, type);
1728
1729         if (ndev) {
1730                 if (params) {
1731                         ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1732                         if (type == NL80211_IFTYPE_STATION)
1733                                 sdata->u.mgd.use_4addr = params->use_4addr;
1734                 }
1735
1736                 ndev->features |= local->hw.netdev_features;
1737
1738                 netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops);
1739
1740                 ret = register_netdevice(ndev);
1741                 if (ret) {
1742                         free_netdev(ndev);
1743                         return ret;
1744                 }
1745         }
1746
1747         mutex_lock(&local->iflist_mtx);
1748         list_add_tail_rcu(&sdata->list, &local->interfaces);
1749         mutex_unlock(&local->iflist_mtx);
1750
1751         if (new_wdev)
1752                 *new_wdev = &sdata->wdev;
1753
1754         return 0;
1755 }
1756
1757 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1758 {
1759         ASSERT_RTNL();
1760
1761         mutex_lock(&sdata->local->iflist_mtx);
1762         list_del_rcu(&sdata->list);
1763         mutex_unlock(&sdata->local->iflist_mtx);
1764
1765         synchronize_rcu();
1766
1767         if (sdata->dev) {
1768                 unregister_netdevice(sdata->dev);
1769         } else {
1770                 cfg80211_unregister_wdev(&sdata->wdev);
1771                 kfree(sdata);
1772         }
1773 }
1774
1775 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
1776 {
1777         if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
1778                 return;
1779         ieee80211_do_stop(sdata, true);
1780         ieee80211_teardown_sdata(sdata);
1781 }
1782
1783 /*
1784  * Remove all interfaces, may only be called at hardware unregistration
1785  * time because it doesn't do RCU-safe list removals.
1786  */
1787 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1788 {
1789         struct ieee80211_sub_if_data *sdata, *tmp;
1790         LIST_HEAD(unreg_list);
1791         LIST_HEAD(wdev_list);
1792
1793         ASSERT_RTNL();
1794
1795         /*
1796          * Close all AP_VLAN interfaces first, as otherwise they
1797          * might be closed while the AP interface they belong to
1798          * is closed, causing unregister_netdevice_many() to crash.
1799          */
1800         list_for_each_entry(sdata, &local->interfaces, list)
1801                 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1802                         dev_close(sdata->dev);
1803
1804         mutex_lock(&local->iflist_mtx);
1805         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1806                 list_del(&sdata->list);
1807
1808                 if (sdata->dev)
1809                         unregister_netdevice_queue(sdata->dev, &unreg_list);
1810                 else
1811                         list_add(&sdata->list, &wdev_list);
1812         }
1813         mutex_unlock(&local->iflist_mtx);
1814         unregister_netdevice_many(&unreg_list);
1815
1816         list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
1817                 list_del(&sdata->list);
1818                 cfg80211_unregister_wdev(&sdata->wdev);
1819                 kfree(sdata);
1820         }
1821 }
1822
1823 static int netdev_notify(struct notifier_block *nb,
1824                          unsigned long state, void *ptr)
1825 {
1826         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1827         struct ieee80211_sub_if_data *sdata;
1828
1829         if (state != NETDEV_CHANGENAME)
1830                 return NOTIFY_DONE;
1831
1832         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1833                 return NOTIFY_DONE;
1834
1835         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1836                 return NOTIFY_DONE;
1837
1838         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1839         memcpy(sdata->name, dev->name, IFNAMSIZ);
1840         ieee80211_debugfs_rename_netdev(sdata);
1841
1842         return NOTIFY_OK;
1843 }
1844
1845 static struct notifier_block mac80211_netdev_notifier = {
1846         .notifier_call = netdev_notify,
1847 };
1848
1849 int ieee80211_iface_init(void)
1850 {
1851         return register_netdevice_notifier(&mac80211_netdev_notifier);
1852 }
1853
1854 void ieee80211_iface_exit(void)
1855 {
1856         unregister_netdevice_notifier(&mac80211_netdev_notifier);
1857 }