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         bool cancel_scan;
 770
 771         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 772
 773         cancel_scan = rcu_access_pointer(local->scan_sdata) == sdata;
 774         if (cancel_scan)
 775                 ieee80211_scan_cancel(local);
 776
 777         /*
 778          * Stop TX on this interface first.
 779          */
 780         if (sdata->dev)
 781                 netif_tx_stop_all_queues(sdata->dev);
 782
 783         ieee80211_roc_purge(local, sdata);
 784
 785         switch (sdata->vif.type) {
 786         case NL80211_IFTYPE_STATION:
 787                 ieee80211_mgd_stop(sdata);
 788                 break;
 789         case NL80211_IFTYPE_ADHOC:
 790                 ieee80211_ibss_stop(sdata);
 791                 break;
 792         case NL80211_IFTYPE_AP:
 793                 cancel_work_sync(&sdata->u.ap.request_smps_work);
 794                 break;
 795         default:
 796                 break;
 797         }
 798
 799         /*
 800          * Remove all stations associated with this interface.
 801          *
 802          * This must be done before calling ops->remove_interface()
 803          * because otherwise we can later invoke ops->sta_notify()
 804          * whenever the STAs are removed, and that invalidates driver
 805          * assumptions about always getting a vif pointer that is valid
 806          * (because if we remove a STA after ops->remove_interface()
 807          * the driver will have removed the vif info already!)
 808          *
 809          * This is relevant only in WDS mode, in all other modes we've
 810          * already removed all stations when disconnecting or similar,
 811          * so warn otherwise.
 812          */
 813         flushed = sta_info_flush(sdata);
 814         WARN_ON_ONCE((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) ||
 815                      (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1));
 816
 817         /* don't count this interface for promisc/allmulti while it is down */
 818         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 819                 atomic_dec(&local->iff_allmultis);
 820
 821         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 822                 atomic_dec(&local->iff_promiscs);
 823
 824         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 825                 local->fif_pspoll--;
 826                 local->fif_probe_req--;
 827         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 828                 local->fif_probe_req--;
 829         }
 830
 831         if (sdata->dev) {
 832                 netif_addr_lock_bh(sdata->dev);
 833                 spin_lock_bh(&local->filter_lock);
 834                 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
 835                                  sdata->dev->addr_len);
 836                 spin_unlock_bh(&local->filter_lock);
 837                 netif_addr_unlock_bh(sdata->dev);
 838         }
 839
 840         del_timer_sync(&local->dynamic_ps_timer);
 841         cancel_work_sync(&local->dynamic_ps_enable_work);
 842
 843         cancel_work_sync(&sdata->recalc_smps);
 844         sdata_lock(sdata);
 845         mutex_lock(&local->mtx);
 846         sdata->vif.csa_active = false;
 847         if (sdata->csa_block_tx) {
 848                 ieee80211_wake_vif_queues(local, sdata,
 849                                           IEEE80211_QUEUE_STOP_REASON_CSA);
 850                 sdata->csa_block_tx = false;
 851         }
 852         mutex_unlock(&local->mtx);
 853         sdata_unlock(sdata);
 854
 855         cancel_work_sync(&sdata->csa_finalize_work);
 856
 857         cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
 858
 859         if (sdata->wdev.cac_started) {
 860                 chandef = sdata->vif.bss_conf.chandef;
 861                 WARN_ON(local->suspended);
 862                 mutex_lock(&local->mtx);
 863                 ieee80211_vif_release_channel(sdata);
 864                 mutex_unlock(&local->mtx);
 865                 cfg80211_cac_event(sdata->dev, &chandef,
 866                                    NL80211_RADAR_CAC_ABORTED,
 867                                    GFP_KERNEL);
 868         }
 869
 870         /* APs need special treatment */
 871         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 872                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
 873
 874                 /* down all dependent devices, that is VLANs */
 875                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
 876                                          u.vlan.list)
 877                         dev_close(vlan->dev);
 878                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
 879         } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 880                 /* remove all packets in parent bc_buf pointing to this dev */
 881                 ps = &sdata->bss->ps;
 882
 883                 spin_lock_irqsave(&ps->bc_buf.lock, flags);
 884                 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
 885                         if (skb->dev == sdata->dev) {
 886                                 __skb_unlink(skb, &ps->bc_buf);
 887                                 local->total_ps_buffered--;
 888                                 ieee80211_free_txskb(&local->hw, skb);
 889                         }
 890                 }
 891                 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
 892         }
 893
 894         if (going_down)
 895                 local->open_count--;
 896
 897         switch (sdata->vif.type) {
 898         case NL80211_IFTYPE_AP_VLAN:
 899                 mutex_lock(&local->mtx);
 900                 list_del(&sdata->u.vlan.list);
 901                 mutex_unlock(&local->mtx);
 902                 RCU_INIT_POINTER(sdata->vif.chanctx_conf, NULL);
 903                 /* see comment in the default case below */
 904                 ieee80211_free_keys(sdata, true);
 905                 /* no need to tell driver */
 906                 break;
 907         case NL80211_IFTYPE_MONITOR:
 908                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 909                         local->cooked_mntrs--;
 910                         break;
 911                 }
 912
 913                 local->monitors--;
 914                 if (local->monitors == 0) {
 915                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
 916                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 917                 }
 918
 919                 ieee80211_adjust_monitor_flags(sdata, -1);
 920                 break;
 921         case NL80211_IFTYPE_P2P_DEVICE:
 922                 /* relies on synchronize_rcu() below */
 923                 RCU_INIT_POINTER(local->p2p_sdata, NULL);
 924                 /* fall through */
 925         default:
 926                 cancel_work_sync(&sdata->work);
 927                 /*
 928                  * When we get here, the interface is marked down.
 929                  * Free the remaining keys, if there are any
 930                  * (which can happen in AP mode if userspace sets
 931                  * keys before the interface is operating, and maybe
 932                  * also in WDS mode)
 933                  *
 934                  * Force the key freeing to always synchronize_net()
 935                  * to wait for the RX path in case it is using this
 936                  * interface enqueuing frames at this very time on
 937                  * another CPU.
 938                  */
 939                 ieee80211_free_keys(sdata, true);
 940                 skb_queue_purge(&sdata->skb_queue);
 941         }
 942
 943         sdata->bss = NULL;
 944
 945         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 946         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 947                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
 948                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 949                         if (info->control.vif == &sdata->vif) {
 950                                 __skb_unlink(skb, &local->pending[i]);
 951                                 ieee80211_free_txskb(&local->hw, skb);
 952                         }
 953                 }
 954         }
 955         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 956
 957         if (local->open_count == 0)
 958                 ieee80211_clear_tx_pending(local);
 959
 960         /*
 961          * If the interface goes down while suspended, presumably because
 962          * the device was unplugged and that happens before our resume,
 963          * then the driver is already unconfigured and the remainder of
 964          * this function isn't needed.
 965          * XXX: what about WoWLAN? If the device has software state, e.g.
 966          *      memory allocated, it might expect teardown commands from
 967          *      mac80211 here?
 968          */
 969         if (local->suspended) {
 970                 WARN_ON(local->wowlan);
 971                 WARN_ON(rtnl_dereference(local->monitor_sdata));
 972                 return;
 973         }
 974
 975         switch (sdata->vif.type) {
 976         case NL80211_IFTYPE_AP_VLAN:
 977                 break;
 978         case NL80211_IFTYPE_MONITOR:
 979                 if (local->monitors == 0)
 980                         ieee80211_del_virtual_monitor(local);
 981
 982                 mutex_lock(&local->mtx);
 983                 ieee80211_recalc_idle(local);
 984                 mutex_unlock(&local->mtx);
 985
 986                 if (!(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE))
 987                         break;
 988
 989                 /* fall through */
 990         default:
 991                 if (going_down)
 992                         drv_remove_interface(local, sdata);
 993         }
 994
 995         ieee80211_recalc_ps(local, -1);
 996
 997         if (cancel_scan)
 998                 flush_delayed_work(&local->scan_work);
 999
1000         if (local->open_count == 0) {
1001                 ieee80211_stop_device(local);
1002
1003                 /* no reconfiguring after stop! */
1004                 return;
1005         }
1006
1007         /* do after stop to avoid reconfiguring when we stop anyway */
1008         ieee80211_configure_filter(local);
1009         ieee80211_hw_config(local, hw_reconf_flags);
1010
1011         if (local->monitors == local->open_count)
1012                 ieee80211_add_virtual_monitor(local);
1013 }
1014
1015 static int ieee80211_stop(struct net_device *dev)
1016 {
1017         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1018
1019         ieee80211_do_stop(sdata, true);
1020
1021         return 0;
1022 }
1023
1024 static void ieee80211_set_multicast_list(struct net_device *dev)
1025 {
1026         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1027         struct ieee80211_local *local = sdata->local;
1028         int allmulti, promisc, sdata_allmulti, sdata_promisc;
1029
1030         allmulti = !!(dev->flags & IFF_ALLMULTI);
1031         promisc = !!(dev->flags & IFF_PROMISC);
1032         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
1033         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
1034
1035         if (allmulti != sdata_allmulti) {
1036                 if (dev->flags & IFF_ALLMULTI)
1037                         atomic_inc(&local->iff_allmultis);
1038                 else
1039                         atomic_dec(&local->iff_allmultis);
1040                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
1041         }
1042
1043         if (promisc != sdata_promisc) {
1044                 if (dev->flags & IFF_PROMISC)
1045                         atomic_inc(&local->iff_promiscs);
1046                 else
1047                         atomic_dec(&local->iff_promiscs);
1048                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
1049         }
1050         spin_lock_bh(&local->filter_lock);
1051         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
1052         spin_unlock_bh(&local->filter_lock);
1053         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
1054 }
1055
1056 /*
1057  * Called when the netdev is removed or, by the code below, before
1058  * the interface type changes.
1059  */
1060 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
1061 {
1062         int i;
1063
1064         /* free extra data */
1065         ieee80211_free_keys(sdata, false);
1066
1067         ieee80211_debugfs_remove_netdev(sdata);
1068
1069         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1070                 __skb_queue_purge(&sdata->fragments[i].skb_list);
1071         sdata->fragment_next = 0;
1072
1073         if (ieee80211_vif_is_mesh(&sdata->vif))
1074                 mesh_rmc_free(sdata);
1075 }
1076
1077 static void ieee80211_uninit(struct net_device *dev)
1078 {
1079         ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
1080 }
1081
1082 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
1083                                          struct sk_buff *skb,
1084                                          void *accel_priv,
1085                                          select_queue_fallback_t fallback)
1086 {
1087         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
1088 }
1089
1090 static const struct net_device_ops ieee80211_dataif_ops = {
1091         .ndo_open               = ieee80211_open,
1092         .ndo_stop               = ieee80211_stop,
1093         .ndo_uninit             = ieee80211_uninit,
1094         .ndo_start_xmit         = ieee80211_subif_start_xmit,
1095         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1096         .ndo_change_mtu         = ieee80211_change_mtu,
1097         .ndo_set_mac_address    = ieee80211_change_mac,
1098         .ndo_select_queue       = ieee80211_netdev_select_queue,
1099 };
1100
1101 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
1102                                           struct sk_buff *skb,
1103                                           void *accel_priv,
1104                                           select_queue_fallback_t fallback)
1105 {
1106         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1107         struct ieee80211_local *local = sdata->local;
1108         struct ieee80211_hdr *hdr;
1109         struct ieee80211_radiotap_header *rtap = (void *)skb->data;
1110
1111         if (local->hw.queues < IEEE80211_NUM_ACS)
1112                 return 0;
1113
1114         if (skb->len < 4 ||
1115             skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
1116                 return 0; /* doesn't matter, frame will be dropped */
1117
1118         hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
1119
1120         return ieee80211_select_queue_80211(sdata, skb, hdr);
1121 }
1122
1123 static const struct net_device_ops ieee80211_monitorif_ops = {
1124         .ndo_open               = ieee80211_open,
1125         .ndo_stop               = ieee80211_stop,
1126         .ndo_uninit             = ieee80211_uninit,
1127         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
1128         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1129         .ndo_change_mtu         = ieee80211_change_mtu,
1130         .ndo_set_mac_address    = ieee80211_change_mac,
1131         .ndo_select_queue       = ieee80211_monitor_select_queue,
1132 };
1133
1134 static void ieee80211_if_setup(struct net_device *dev)
1135 {
1136         ether_setup(dev);
1137         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1138         dev->netdev_ops = &ieee80211_dataif_ops;
1139         dev->destructor = free_netdev;
1140 }
1141
1142 static void ieee80211_iface_work(struct work_struct *work)
1143 {
1144         struct ieee80211_sub_if_data *sdata =
1145                 container_of(work, struct ieee80211_sub_if_data, work);
1146         struct ieee80211_local *local = sdata->local;
1147         struct sk_buff *skb;
1148         struct sta_info *sta;
1149         struct ieee80211_ra_tid *ra_tid;
1150         struct ieee80211_rx_agg *rx_agg;
1151
1152         if (!ieee80211_sdata_running(sdata))
1153                 return;
1154
1155         if (local->scanning)
1156                 return;
1157
1158         /*
1159          * ieee80211_queue_work() should have picked up most cases,
1160          * here we'll pick the rest.
1161          */
1162         if (WARN(local->suspended,
1163                  "interface work scheduled while going to suspend\n"))
1164                 return;
1165
1166         /* first process frames */
1167         while ((skb = skb_dequeue(&sdata->skb_queue))) {
1168                 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1169
1170                 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
1171                         ra_tid = (void *)&skb->cb;
1172                         ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
1173                                                  ra_tid->tid);
1174                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
1175                         ra_tid = (void *)&skb->cb;
1176                         ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
1177                                                 ra_tid->tid);
1178                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_RX_AGG_START) {
1179                         rx_agg = (void *)&skb->cb;
1180                         mutex_lock(&local->sta_mtx);
1181                         sta = sta_info_get_bss(sdata, rx_agg->addr);
1182                         if (sta)
1183                                 __ieee80211_start_rx_ba_session(sta,
1184                                                 0, 0, 0, 1, rx_agg->tid,
1185                                                 IEEE80211_MAX_AMPDU_BUF,
1186                                                 false, true);
1187                         mutex_unlock(&local->sta_mtx);
1188                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_RX_AGG_STOP) {
1189                         rx_agg = (void *)&skb->cb;
1190                         mutex_lock(&local->sta_mtx);
1191                         sta = sta_info_get_bss(sdata, rx_agg->addr);
1192                         if (sta)
1193                                 __ieee80211_stop_rx_ba_session(sta,
1194                                                         rx_agg->tid,
1195                                                         WLAN_BACK_RECIPIENT, 0,
1196                                                         false);
1197                         mutex_unlock(&local->sta_mtx);
1198                 } else if (ieee80211_is_action(mgmt->frame_control) &&
1199                            mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1200                         int len = skb->len;
1201
1202                         mutex_lock(&local->sta_mtx);
1203                         sta = sta_info_get_bss(sdata, mgmt->sa);
1204                         if (sta) {
1205                                 switch (mgmt->u.action.u.addba_req.action_code) {
1206                                 case WLAN_ACTION_ADDBA_REQ:
1207                                         ieee80211_process_addba_request(
1208                                                         local, sta, mgmt, len);
1209                                         break;
1210                                 case WLAN_ACTION_ADDBA_RESP:
1211                                         ieee80211_process_addba_resp(local, sta,
1212                                                                      mgmt, len);
1213                                         break;
1214                                 case WLAN_ACTION_DELBA:
1215                                         ieee80211_process_delba(sdata, sta,
1216                                                                 mgmt, len);
1217                                         break;
1218                                 default:
1219                                         WARN_ON(1);
1220                                         break;
1221                                 }
1222                         }
1223                         mutex_unlock(&local->sta_mtx);
1224                 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1225                         struct ieee80211_hdr *hdr = (void *)mgmt;
1226                         /*
1227                          * So the frame isn't mgmt, but frame_control
1228                          * is at the right place anyway, of course, so
1229                          * the if statement is correct.
1230                          *
1231                          * Warn if we have other data frame types here,
1232                          * they must not get here.
1233                          */
1234                         WARN_ON(hdr->frame_control &
1235                                         cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1236                         WARN_ON(!(hdr->seq_ctrl &
1237                                         cpu_to_le16(IEEE80211_SCTL_FRAG)));
1238                         /*
1239                          * This was a fragment of a frame, received while
1240                          * a block-ack session was active. That cannot be
1241                          * right, so terminate the session.
1242                          */
1243                         mutex_lock(&local->sta_mtx);
1244                         sta = sta_info_get_bss(sdata, mgmt->sa);
1245                         if (sta) {
1246                                 u16 tid = *ieee80211_get_qos_ctl(hdr) &
1247                                                 IEEE80211_QOS_CTL_TID_MASK;
1248
1249                                 __ieee80211_stop_rx_ba_session(
1250                                         sta, tid, WLAN_BACK_RECIPIENT,
1251                                         WLAN_REASON_QSTA_REQUIRE_SETUP,
1252                                         true);
1253                         }
1254                         mutex_unlock(&local->sta_mtx);
1255                 } else switch (sdata->vif.type) {
1256                 case NL80211_IFTYPE_STATION:
1257                         ieee80211_sta_rx_queued_mgmt(sdata, skb);
1258                         break;
1259                 case NL80211_IFTYPE_ADHOC:
1260                         ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1261                         break;
1262                 case NL80211_IFTYPE_MESH_POINT:
1263                         if (!ieee80211_vif_is_mesh(&sdata->vif))
1264                                 break;
1265                         ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1266                         break;
1267                 default:
1268                         WARN(1, "frame for unexpected interface type");
1269                         break;
1270                 }
1271
1272                 kfree_skb(skb);
1273         }
1274
1275         /* then other type-dependent work */
1276         switch (sdata->vif.type) {
1277         case NL80211_IFTYPE_STATION:
1278                 ieee80211_sta_work(sdata);
1279                 break;
1280         case NL80211_IFTYPE_ADHOC:
1281                 ieee80211_ibss_work(sdata);
1282                 break;
1283         case NL80211_IFTYPE_MESH_POINT:
1284                 if (!ieee80211_vif_is_mesh(&sdata->vif))
1285                         break;
1286                 ieee80211_mesh_work(sdata);
1287                 break;
1288         default:
1289                 break;
1290         }
1291 }
1292
1293 static void ieee80211_recalc_smps_work(struct work_struct *work)
1294 {
1295         struct ieee80211_sub_if_data *sdata =
1296                 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1297
1298         ieee80211_recalc_smps(sdata);
1299 }
1300
1301 /*
1302  * Helper function to initialise an interface to a specific type.
1303  */
1304 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1305                                   enum nl80211_iftype type)
1306 {
1307         /* clear type-dependent union */
1308         memset(&sdata->u, 0, sizeof(sdata->u));
1309
1310         /* and set some type-dependent values */
1311         sdata->vif.type = type;
1312         sdata->vif.p2p = false;
1313         sdata->wdev.iftype = type;
1314
1315         sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1316         sdata->control_port_no_encrypt = false;
1317         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1318         sdata->vif.bss_conf.idle = true;
1319
1320         sdata->noack_map = 0;
1321
1322         /* only monitor/p2p-device differ */
1323         if (sdata->dev) {
1324                 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1325                 sdata->dev->type = ARPHRD_ETHER;
1326         }
1327
1328         skb_queue_head_init(&sdata->skb_queue);
1329         INIT_WORK(&sdata->work, ieee80211_iface_work);
1330         INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1331         INIT_WORK(&sdata->csa_finalize_work, ieee80211_csa_finalize_work);
1332         INIT_LIST_HEAD(&sdata->assigned_chanctx_list);
1333         INIT_LIST_HEAD(&sdata->reserved_chanctx_list);
1334
1335         switch (type) {
1336         case NL80211_IFTYPE_P2P_GO:
1337                 type = NL80211_IFTYPE_AP;
1338                 sdata->vif.type = type;
1339                 sdata->vif.p2p = true;
1340                 /* fall through */
1341         case NL80211_IFTYPE_AP:
1342                 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1343                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1344                 INIT_WORK(&sdata->u.ap.request_smps_work,
1345                           ieee80211_request_smps_ap_work);
1346                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1347                 sdata->u.ap.req_smps = IEEE80211_SMPS_OFF;
1348                 break;
1349         case NL80211_IFTYPE_P2P_CLIENT:
1350                 type = NL80211_IFTYPE_STATION;
1351                 sdata->vif.type = type;
1352                 sdata->vif.p2p = true;
1353                 /* fall through */
1354         case NL80211_IFTYPE_STATION:
1355                 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1356                 ieee80211_sta_setup_sdata(sdata);
1357                 break;
1358         case NL80211_IFTYPE_ADHOC:
1359                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1360                 ieee80211_ibss_setup_sdata(sdata);
1361                 break;
1362         case NL80211_IFTYPE_MESH_POINT:
1363                 if (ieee80211_vif_is_mesh(&sdata->vif))
1364                         ieee80211_mesh_init_sdata(sdata);
1365                 break;
1366         case NL80211_IFTYPE_MONITOR:
1367                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1368                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1369                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
1370                                       MONITOR_FLAG_OTHER_BSS;
1371                 break;
1372         case NL80211_IFTYPE_WDS:
1373                 sdata->vif.bss_conf.bssid = NULL;
1374                 break;
1375         case NL80211_IFTYPE_AP_VLAN:
1376         case NL80211_IFTYPE_P2P_DEVICE:
1377                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1378                 break;
1379         case NL80211_IFTYPE_UNSPECIFIED:
1380         case NUM_NL80211_IFTYPES:
1381                 BUG();
1382                 break;
1383         }
1384
1385         ieee80211_debugfs_add_netdev(sdata);
1386 }
1387
1388 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1389                                            enum nl80211_iftype type)
1390 {
1391         struct ieee80211_local *local = sdata->local;
1392         int ret, err;
1393         enum nl80211_iftype internal_type = type;
1394         bool p2p = false;
1395
1396         ASSERT_RTNL();
1397
1398         if (!local->ops->change_interface)
1399                 return -EBUSY;
1400
1401         switch (sdata->vif.type) {
1402         case NL80211_IFTYPE_AP:
1403         case NL80211_IFTYPE_STATION:
1404         case NL80211_IFTYPE_ADHOC:
1405                 /*
1406                  * Could maybe also all others here?
1407                  * Just not sure how that interacts
1408                  * with the RX/config path e.g. for
1409                  * mesh.
1410                  */
1411                 break;
1412         default:
1413                 return -EBUSY;
1414         }
1415
1416         switch (type) {
1417         case NL80211_IFTYPE_AP:
1418         case NL80211_IFTYPE_STATION:
1419         case NL80211_IFTYPE_ADHOC:
1420                 /*
1421                  * Could probably support everything
1422                  * but WDS here (WDS do_open can fail
1423                  * under memory pressure, which this
1424                  * code isn't prepared to handle).
1425                  */
1426                 break;
1427         case NL80211_IFTYPE_P2P_CLIENT:
1428                 p2p = true;
1429                 internal_type = NL80211_IFTYPE_STATION;
1430                 break;
1431         case NL80211_IFTYPE_P2P_GO:
1432                 p2p = true;
1433                 internal_type = NL80211_IFTYPE_AP;
1434                 break;
1435         default:
1436                 return -EBUSY;
1437         }
1438
1439         ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1440         if (ret)
1441                 return ret;
1442
1443         ieee80211_do_stop(sdata, false);
1444
1445         ieee80211_teardown_sdata(sdata);
1446
1447         ret = drv_change_interface(local, sdata, internal_type, p2p);
1448         if (ret)
1449                 type = ieee80211_vif_type_p2p(&sdata->vif);
1450
1451         /*
1452          * Ignore return value here, there's not much we can do since
1453          * the driver changed the interface type internally already.
1454          * The warnings will hopefully make driver authors fix it :-)
1455          */
1456         ieee80211_check_queues(sdata, type);
1457
1458         ieee80211_setup_sdata(sdata, type);
1459
1460         err = ieee80211_do_open(&sdata->wdev, false);
1461         WARN(err, "type change: do_open returned %d", err);
1462
1463         return ret;
1464 }
1465
1466 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1467                              enum nl80211_iftype type)
1468 {
1469         int ret;
1470
1471         ASSERT_RTNL();
1472
1473         if (type == ieee80211_vif_type_p2p(&sdata->vif))
1474                 return 0;
1475
1476         if (ieee80211_sdata_running(sdata)) {
1477                 ret = ieee80211_runtime_change_iftype(sdata, type);
1478                 if (ret)
1479                         return ret;
1480         } else {
1481                 /* Purge and reset type-dependent state. */
1482                 ieee80211_teardown_sdata(sdata);
1483                 ieee80211_setup_sdata(sdata, type);
1484         }
1485
1486         /* reset some values that shouldn't be kept across type changes */
1487         sdata->drop_unencrypted = 0;
1488         if (type == NL80211_IFTYPE_STATION)
1489                 sdata->u.mgd.use_4addr = false;
1490
1491         return 0;
1492 }
1493
1494 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1495                                        u8 *perm_addr, enum nl80211_iftype type)
1496 {
1497         struct ieee80211_sub_if_data *sdata;
1498         u64 mask, start, addr, val, inc;
1499         u8 *m;
1500         u8 tmp_addr[ETH_ALEN];
1501         int i;
1502
1503         /* default ... something at least */
1504         memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1505
1506         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1507             local->hw.wiphy->n_addresses <= 1)
1508                 return;
1509
1510         mutex_lock(&local->iflist_mtx);
1511
1512         switch (type) {
1513         case NL80211_IFTYPE_MONITOR:
1514                 /* doesn't matter */
1515                 break;
1516         case NL80211_IFTYPE_WDS:
1517         case NL80211_IFTYPE_AP_VLAN:
1518                 /* match up with an AP interface */
1519                 list_for_each_entry(sdata, &local->interfaces, list) {
1520                         if (sdata->vif.type != NL80211_IFTYPE_AP)
1521                                 continue;
1522                         memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1523                         break;
1524                 }
1525                 /* keep default if no AP interface present */
1526                 break;
1527         case NL80211_IFTYPE_P2P_CLIENT:
1528         case NL80211_IFTYPE_P2P_GO:
1529                 if (local->hw.flags & IEEE80211_HW_P2P_DEV_ADDR_FOR_INTF) {
1530                         list_for_each_entry(sdata, &local->interfaces, list) {
1531                                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1532                                         continue;
1533                                 if (!ieee80211_sdata_running(sdata))
1534                                         continue;
1535                                 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1536                                 goto out_unlock;
1537                         }
1538                 }
1539                 /* otherwise fall through */
1540         default:
1541                 /* assign a new address if possible -- try n_addresses first */
1542                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1543                         bool used = false;
1544
1545                         list_for_each_entry(sdata, &local->interfaces, list) {
1546                                 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr,
1547                                                      sdata->vif.addr)) {
1548                                         used = true;
1549                                         break;
1550                                 }
1551                         }
1552
1553                         if (!used) {
1554                                 memcpy(perm_addr,
1555                                        local->hw.wiphy->addresses[i].addr,
1556                                        ETH_ALEN);
1557                                 break;
1558                         }
1559                 }
1560
1561                 /* try mask if available */
1562                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1563                         break;
1564
1565                 m = local->hw.wiphy->addr_mask;
1566                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1567                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1568                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1569
1570                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1571                         /* not a contiguous mask ... not handled now! */
1572                         pr_info("not contiguous\n");
1573                         break;
1574                 }
1575
1576                 /*
1577                  * Pick address of existing interface in case user changed
1578                  * MAC address manually, default to perm_addr.
1579                  */
1580                 m = local->hw.wiphy->perm_addr;
1581                 list_for_each_entry(sdata, &local->interfaces, list) {
1582                         if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
1583                                 continue;
1584                         m = sdata->vif.addr;
1585                         break;
1586                 }
1587                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1588                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1589                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1590
1591                 inc = 1ULL<<__ffs64(mask);
1592                 val = (start & mask);
1593                 addr = (start & ~mask) | (val & mask);
1594                 do {
1595                         bool used = false;
1596
1597                         tmp_addr[5] = addr >> 0*8;
1598                         tmp_addr[4] = addr >> 1*8;
1599                         tmp_addr[3] = addr >> 2*8;
1600                         tmp_addr[2] = addr >> 3*8;
1601                         tmp_addr[1] = addr >> 4*8;
1602                         tmp_addr[0] = addr >> 5*8;
1603
1604                         val += inc;
1605
1606                         list_for_each_entry(sdata, &local->interfaces, list) {
1607                                 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) {
1608                                         used = true;
1609                                         break;
1610                                 }
1611                         }
1612
1613                         if (!used) {
1614                                 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1615                                 break;
1616                         }
1617                         addr = (start & ~mask) | (val & mask);
1618                 } while (addr != start);
1619
1620                 break;
1621         }
1622
1623  out_unlock:
1624         mutex_unlock(&local->iflist_mtx);
1625 }
1626
1627 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1628                      struct wireless_dev **new_wdev, enum nl80211_iftype type,
1629                      struct vif_params *params)
1630 {
1631         struct net_device *ndev = NULL;
1632         struct ieee80211_sub_if_data *sdata = NULL;
1633         int ret, i;
1634         int txqs = 1;
1635
1636         ASSERT_RTNL();
1637
1638         if (type == NL80211_IFTYPE_P2P_DEVICE) {
1639                 struct wireless_dev *wdev;
1640
1641                 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1642                                 GFP_KERNEL);
1643                 if (!sdata)
1644                         return -ENOMEM;
1645                 wdev = &sdata->wdev;
1646
1647                 sdata->dev = NULL;
1648                 strlcpy(sdata->name, name, IFNAMSIZ);
1649                 ieee80211_assign_perm_addr(local, wdev->address, type);
1650                 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1651         } else {
1652                 if (local->hw.queues >= IEEE80211_NUM_ACS)
1653                         txqs = IEEE80211_NUM_ACS;
1654
1655                 ndev = alloc_netdev_mqs(sizeof(*sdata) + local->hw.vif_data_size,
1656                                         name, NET_NAME_UNKNOWN,
1657                                         ieee80211_if_setup, txqs, 1);
1658                 if (!ndev)
1659                         return -ENOMEM;
1660                 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1661
1662                 ndev->needed_headroom = local->tx_headroom +
1663                                         4*6 /* four MAC addresses */
1664                                         + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1665                                         + 6 /* mesh */
1666                                         + 8 /* rfc1042/bridge tunnel */
1667                                         - ETH_HLEN /* ethernet hard_header_len */
1668                                         + IEEE80211_ENCRYPT_HEADROOM;
1669                 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1670
1671                 ret = dev_alloc_name(ndev, ndev->name);
1672                 if (ret < 0) {
1673                         free_netdev(ndev);
1674                         return ret;
1675                 }
1676
1677                 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1678                 memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1679                 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1680
1681                 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1682                 sdata = netdev_priv(ndev);
1683                 ndev->ieee80211_ptr = &sdata->wdev;
1684                 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1685                 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1686
1687                 sdata->dev = ndev;
1688         }
1689
1690         /* initialise type-independent data */
1691         sdata->wdev.wiphy = local->hw.wiphy;
1692         sdata->local = local;
1693
1694         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1695                 skb_queue_head_init(&sdata->fragments[i].skb_list);
1696
1697         INIT_LIST_HEAD(&sdata->key_list);
1698
1699         INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
1700                           ieee80211_dfs_cac_timer_work);
1701         INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
1702                           ieee80211_delayed_tailroom_dec);
1703
1704         for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1705                 struct ieee80211_supported_band *sband;
1706                 sband = local->hw.wiphy->bands[i];
1707                 sdata->rc_rateidx_mask[i] =
1708                         sband ? (1 << sband->n_bitrates) - 1 : 0;
1709                 if (sband)
1710                         memcpy(sdata->rc_rateidx_mcs_mask[i],
1711                                sband->ht_cap.mcs.rx_mask,
1712                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1713                 else
1714                         memset(sdata->rc_rateidx_mcs_mask[i], 0,
1715                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1716         }
1717
1718         ieee80211_set_default_queues(sdata);
1719
1720         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1721         sdata->user_power_level = local->user_power_level;
1722
1723         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1724
1725         /* setup type-dependent data */
1726         ieee80211_setup_sdata(sdata, type);
1727
1728         if (ndev) {
1729                 if (params) {
1730                         ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1731                         if (type == NL80211_IFTYPE_STATION)
1732                                 sdata->u.mgd.use_4addr = params->use_4addr;
1733                 }
1734
1735                 ndev->features |= local->hw.netdev_features;
1736
1737                 netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops);
1738
1739                 ret = register_netdevice(ndev);
1740                 if (ret) {
1741                         free_netdev(ndev);
1742                         return ret;
1743                 }
1744         }
1745
1746         mutex_lock(&local->iflist_mtx);
1747         list_add_tail_rcu(&sdata->list, &local->interfaces);
1748         mutex_unlock(&local->iflist_mtx);
1749
1750         if (new_wdev)
1751                 *new_wdev = &sdata->wdev;
1752
1753         return 0;
1754 }
1755
1756 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1757 {
1758         ASSERT_RTNL();
1759
1760         mutex_lock(&sdata->local->iflist_mtx);
1761         list_del_rcu(&sdata->list);
1762         mutex_unlock(&sdata->local->iflist_mtx);
1763
1764         synchronize_rcu();
1765
1766         if (sdata->dev) {
1767                 unregister_netdevice(sdata->dev);
1768         } else {
1769                 cfg80211_unregister_wdev(&sdata->wdev);
1770                 kfree(sdata);
1771         }
1772 }
1773
1774 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
1775 {
1776         if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
1777                 return;
1778         ieee80211_do_stop(sdata, true);
1779         ieee80211_teardown_sdata(sdata);
1780 }
1781
1782 /*
1783  * Remove all interfaces, may only be called at hardware unregistration
1784  * time because it doesn't do RCU-safe list removals.
1785  */
1786 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1787 {
1788         struct ieee80211_sub_if_data *sdata, *tmp;
1789         LIST_HEAD(unreg_list);
1790         LIST_HEAD(wdev_list);
1791
1792         ASSERT_RTNL();
1793
1794         /*
1795          * Close all AP_VLAN interfaces first, as otherwise they
1796          * might be closed while the AP interface they belong to
1797          * is closed, causing unregister_netdevice_many() to crash.
1798          */
1799         list_for_each_entry(sdata, &local->interfaces, list)
1800                 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1801                         dev_close(sdata->dev);
1802
1803         mutex_lock(&local->iflist_mtx);
1804         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1805                 list_del(&sdata->list);
1806
1807                 if (sdata->dev)
1808                         unregister_netdevice_queue(sdata->dev, &unreg_list);
1809                 else
1810                         list_add(&sdata->list, &wdev_list);
1811         }
1812         mutex_unlock(&local->iflist_mtx);
1813         unregister_netdevice_many(&unreg_list);
1814
1815         list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
1816                 list_del(&sdata->list);
1817                 cfg80211_unregister_wdev(&sdata->wdev);
1818                 kfree(sdata);
1819         }
1820 }
1821
1822 static int netdev_notify(struct notifier_block *nb,
1823                          unsigned long state, void *ptr)
1824 {
1825         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1826         struct ieee80211_sub_if_data *sdata;
1827
1828         if (state != NETDEV_CHANGENAME)
1829                 return NOTIFY_DONE;
1830
1831         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1832                 return NOTIFY_DONE;
1833
1834         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1835                 return NOTIFY_DONE;
1836
1837         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1838         memcpy(sdata->name, dev->name, IFNAMSIZ);
1839         ieee80211_debugfs_rename_netdev(sdata);
1840
1841         return NOTIFY_OK;
1842 }
1843
1844 static struct notifier_block mac80211_netdev_notifier = {
1845         .notifier_call = netdev_notify,
1846 };
1847
1848 int ieee80211_iface_init(void)
1849 {
1850         return register_netdevice_notifier(&mac80211_netdev_notifier);
1851 }
1852
1853 void ieee80211_iface_exit(void)
1854 {
1855         unregister_netdevice_notifier(&mac80211_netdev_notifier);
1856 }