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                 sdata->vif.bss_conf.chandef = master->vif.bss_conf.chandef;
 515                 break;
 516                 }
 517         case NL80211_IFTYPE_AP:
 518                 sdata->bss = &sdata->u.ap;
 519                 break;
 520         case NL80211_IFTYPE_MESH_POINT:
 521         case NL80211_IFTYPE_STATION:
 522         case NL80211_IFTYPE_MONITOR:
 523         case NL80211_IFTYPE_ADHOC:
 524         case NL80211_IFTYPE_P2P_DEVICE:
 525                 /* no special treatment */
 526                 break;
 527         case NL80211_IFTYPE_UNSPECIFIED:
 528         case NUM_NL80211_IFTYPES:
 529         case NL80211_IFTYPE_P2P_CLIENT:
 530         case NL80211_IFTYPE_P2P_GO:
 531                 /* cannot happen */
 532                 WARN_ON(1);
 533                 break;
 534         }
 535
 536         if (local->open_count == 0) {
 537                 res = drv_start(local);
 538                 if (res)
 539                         goto err_del_bss;
 540                 /* we're brought up, everything changes */
 541                 hw_reconf_flags = ~0;
 542                 ieee80211_led_radio(local, true);
 543                 ieee80211_mod_tpt_led_trig(local,
 544                                            IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
 545         }
 546
 547         /*
 548          * Copy the hopefully now-present MAC address to
 549          * this interface, if it has the special null one.
 550          */
 551         if (dev && is_zero_ether_addr(dev->dev_addr)) {
 552                 memcpy(dev->dev_addr,
 553                        local->hw.wiphy->perm_addr,
 554                        ETH_ALEN);
 555                 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
 556
 557                 if (!is_valid_ether_addr(dev->dev_addr)) {
 558                         res = -EADDRNOTAVAIL;
 559                         goto err_stop;
 560                 }
 561         }
 562
 563         switch (sdata->vif.type) {
 564         case NL80211_IFTYPE_AP_VLAN:
 565                 /* no need to tell driver, but set carrier and chanctx */
 566                 if (rtnl_dereference(sdata->bss->beacon)) {
 567                         ieee80211_vif_vlan_copy_chanctx(sdata);
 568                         netif_carrier_on(dev);
 569                 } else {
 570                         netif_carrier_off(dev);
 571                 }
 572                 break;
 573         case NL80211_IFTYPE_MONITOR:
 574                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 575                         local->cooked_mntrs++;
 576                         break;
 577                 }
 578
 579                 if (sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE) {
 580                         res = drv_add_interface(local, sdata);
 581                         if (res)
 582                                 goto err_stop;
 583                 } else if (local->monitors == 0 && local->open_count == 0) {
 584                         res = ieee80211_add_virtual_monitor(local);
 585                         if (res)
 586                                 goto err_stop;
 587                 }
 588
 589                 /* must be before the call to ieee80211_configure_filter */
 590                 local->monitors++;
 591                 if (local->monitors == 1) {
 592                         local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
 593                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 594                 }
 595
 596                 ieee80211_adjust_monitor_flags(sdata, 1);
 597                 ieee80211_configure_filter(local);
 598                 mutex_lock(&local->mtx);
 599                 ieee80211_recalc_idle(local);
 600                 mutex_unlock(&local->mtx);
 601
 602                 netif_carrier_on(dev);
 603                 break;
 604         default:
 605                 if (coming_up) {
 606                         ieee80211_del_virtual_monitor(local);
 607
 608                         res = drv_add_interface(local, sdata);
 609                         if (res)
 610                                 goto err_stop;
 611                         res = ieee80211_check_queues(sdata,
 612                                 ieee80211_vif_type_p2p(&sdata->vif));
 613                         if (res)
 614                                 goto err_del_interface;
 615                 }
 616
 617                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
 618                         local->fif_pspoll++;
 619                         local->fif_probe_req++;
 620
 621                         ieee80211_configure_filter(local);
 622                 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 623                         local->fif_probe_req++;
 624                 }
 625
 626                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
 627                         changed |= ieee80211_reset_erp_info(sdata);
 628                 ieee80211_bss_info_change_notify(sdata, changed);
 629
 630                 switch (sdata->vif.type) {
 631                 case NL80211_IFTYPE_STATION:
 632                 case NL80211_IFTYPE_ADHOC:
 633                 case NL80211_IFTYPE_AP:
 634                 case NL80211_IFTYPE_MESH_POINT:
 635                         netif_carrier_off(dev);
 636                         break;
 637                 case NL80211_IFTYPE_WDS:
 638                 case NL80211_IFTYPE_P2P_DEVICE:
 639                         break;
 640                 default:
 641                         /* not reached */
 642                         WARN_ON(1);
 643                 }
 644
 645                 /*
 646                  * set default queue parameters so drivers don't
 647                  * need to initialise the hardware if the hardware
 648                  * doesn't start up with sane defaults
 649                  */
 650                 ieee80211_set_wmm_default(sdata, true);
 651         }
 652
 653         set_bit(SDATA_STATE_RUNNING, &sdata->state);
 654
 655         if (sdata->vif.type == NL80211_IFTYPE_WDS) {
 656                 /* Create STA entry for the WDS peer */
 657                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
 658                                      GFP_KERNEL);
 659                 if (!sta) {
 660                         res = -ENOMEM;
 661                         goto err_del_interface;
 662                 }
 663
 664                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
 665                 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
 666                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
 667
 668                 res = sta_info_insert(sta);
 669                 if (res) {
 670                         /* STA has been freed */
 671                         goto err_del_interface;
 672                 }
 673
 674                 rate_control_rate_init(sta);
 675                 netif_carrier_on(dev);
 676         } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
 677                 rcu_assign_pointer(local->p2p_sdata, sdata);
 678         }
 679
 680         /*
 681          * set_multicast_list will be invoked by the networking core
 682          * which will check whether any increments here were done in
 683          * error and sync them down to the hardware as filter flags.
 684          */
 685         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 686                 atomic_inc(&local->iff_allmultis);
 687
 688         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 689                 atomic_inc(&local->iff_promiscs);
 690
 691         if (coming_up)
 692                 local->open_count++;
 693
 694         if (hw_reconf_flags)
 695                 ieee80211_hw_config(local, hw_reconf_flags);
 696
 697         ieee80211_recalc_ps(local, -1);
 698
 699         if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
 700             sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 701                 /* XXX: for AP_VLAN, actually track AP queues */
 702                 netif_tx_start_all_queues(dev);
 703         } else if (dev) {
 704                 unsigned long flags;
 705                 int n_acs = IEEE80211_NUM_ACS;
 706                 int ac;
 707
 708                 if (local->hw.queues < IEEE80211_NUM_ACS)
 709                         n_acs = 1;
 710
 711                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 712                 if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE ||
 713                     (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 &&
 714                      skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) {
 715                         for (ac = 0; ac < n_acs; ac++) {
 716                                 int ac_queue = sdata->vif.hw_queue[ac];
 717
 718                                 if (local->queue_stop_reasons[ac_queue] == 0 &&
 719                                     skb_queue_empty(&local->pending[ac_queue]))
 720                                         netif_start_subqueue(dev, ac);
 721                         }
 722                 }
 723                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 724         }
 725
 726         return 0;
 727  err_del_interface:
 728         drv_remove_interface(local, sdata);
 729  err_stop:
 730         if (!local->open_count)
 731                 drv_stop(local);
 732  err_del_bss:
 733         sdata->bss = NULL;
 734         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 735                 mutex_lock(&local->mtx);
 736                 list_del(&sdata->u.vlan.list);
 737                 mutex_unlock(&local->mtx);
 738         }
 739         /* might already be clear but that doesn't matter */
 740         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 741         return res;
 742 }
 743
 744 static int ieee80211_open(struct net_device *dev)
 745 {
 746         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 747         int err;
 748
 749         /* fail early if user set an invalid address */
 750         if (!is_valid_ether_addr(dev->dev_addr))
 751                 return -EADDRNOTAVAIL;
 752
 753         err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
 754         if (err)
 755                 return err;
 756
 757         return ieee80211_do_open(&sdata->wdev, true);
 758 }
 759
 760 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
 761                               bool going_down)
 762 {
 763         struct ieee80211_local *local = sdata->local;
 764         unsigned long flags;
 765         struct sk_buff *skb, *tmp;
 766         u32 hw_reconf_flags = 0;
 767         int i, flushed;
 768         struct ps_data *ps;
 769         struct cfg80211_chan_def chandef;
 770         bool cancel_scan;
 771
 772         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 773
 774         cancel_scan = rcu_access_pointer(local->scan_sdata) == sdata;
 775         if (cancel_scan)
 776                 ieee80211_scan_cancel(local);
 777
 778         /*
 779          * Stop TX on this interface first.
 780          */
 781         if (sdata->dev)
 782                 netif_tx_stop_all_queues(sdata->dev);
 783
 784         ieee80211_roc_purge(local, sdata);
 785
 786         switch (sdata->vif.type) {
 787         case NL80211_IFTYPE_STATION:
 788                 ieee80211_mgd_stop(sdata);
 789                 break;
 790         case NL80211_IFTYPE_ADHOC:
 791                 ieee80211_ibss_stop(sdata);
 792                 break;
 793         case NL80211_IFTYPE_AP:
 794                 cancel_work_sync(&sdata->u.ap.request_smps_work);
 795                 break;
 796         default:
 797                 break;
 798         }
 799
 800         /*
 801          * Remove all stations associated with this interface.
 802          *
 803          * This must be done before calling ops->remove_interface()
 804          * because otherwise we can later invoke ops->sta_notify()
 805          * whenever the STAs are removed, and that invalidates driver
 806          * assumptions about always getting a vif pointer that is valid
 807          * (because if we remove a STA after ops->remove_interface()
 808          * the driver will have removed the vif info already!)
 809          *
 810          * This is relevant only in WDS mode, in all other modes we've
 811          * already removed all stations when disconnecting or similar,
 812          * so warn otherwise.
 813          */
 814         flushed = sta_info_flush(sdata);
 815         WARN_ON_ONCE((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) ||
 816                      (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1));
 817
 818         /* don't count this interface for promisc/allmulti while it is down */
 819         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 820                 atomic_dec(&local->iff_allmultis);
 821
 822         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 823                 atomic_dec(&local->iff_promiscs);
 824
 825         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 826                 local->fif_pspoll--;
 827                 local->fif_probe_req--;
 828         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 829                 local->fif_probe_req--;
 830         }
 831
 832         if (sdata->dev) {
 833                 netif_addr_lock_bh(sdata->dev);
 834                 spin_lock_bh(&local->filter_lock);
 835                 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
 836                                  sdata->dev->addr_len);
 837                 spin_unlock_bh(&local->filter_lock);
 838                 netif_addr_unlock_bh(sdata->dev);
 839         }
 840
 841         del_timer_sync(&local->dynamic_ps_timer);
 842         cancel_work_sync(&local->dynamic_ps_enable_work);
 843
 844         cancel_work_sync(&sdata->recalc_smps);
 845         sdata_lock(sdata);
 846         mutex_lock(&local->mtx);
 847         sdata->vif.csa_active = false;
 848         if (sdata->csa_block_tx) {
 849                 ieee80211_wake_vif_queues(local, sdata,
 850                                           IEEE80211_QUEUE_STOP_REASON_CSA);
 851                 sdata->csa_block_tx = false;
 852         }
 853         mutex_unlock(&local->mtx);
 854         sdata_unlock(sdata);
 855
 856         cancel_work_sync(&sdata->csa_finalize_work);
 857
 858         cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
 859
 860         if (sdata->wdev.cac_started) {
 861                 chandef = sdata->vif.bss_conf.chandef;
 862                 WARN_ON(local->suspended);
 863                 mutex_lock(&local->mtx);
 864                 ieee80211_vif_release_channel(sdata);
 865                 mutex_unlock(&local->mtx);
 866                 cfg80211_cac_event(sdata->dev, &chandef,
 867                                    NL80211_RADAR_CAC_ABORTED,
 868                                    GFP_KERNEL);
 869         }
 870
 871         /* APs need special treatment */
 872         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 873                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
 874
 875                 /* down all dependent devices, that is VLANs */
 876                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
 877                                          u.vlan.list)
 878                         dev_close(vlan->dev);
 879                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
 880         } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 881                 /* remove all packets in parent bc_buf pointing to this dev */
 882                 ps = &sdata->bss->ps;
 883
 884                 spin_lock_irqsave(&ps->bc_buf.lock, flags);
 885                 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
 886                         if (skb->dev == sdata->dev) {
 887                                 __skb_unlink(skb, &ps->bc_buf);
 888                                 local->total_ps_buffered--;
 889                                 ieee80211_free_txskb(&local->hw, skb);
 890                         }
 891                 }
 892                 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
 893         }
 894
 895         if (going_down)
 896                 local->open_count--;
 897
 898         switch (sdata->vif.type) {
 899         case NL80211_IFTYPE_AP_VLAN:
 900                 mutex_lock(&local->mtx);
 901                 list_del(&sdata->u.vlan.list);
 902                 mutex_unlock(&local->mtx);
 903                 RCU_INIT_POINTER(sdata->vif.chanctx_conf, NULL);
 904                 /* see comment in the default case below */
 905                 ieee80211_free_keys(sdata, true);
 906                 /* no need to tell driver */
 907                 break;
 908         case NL80211_IFTYPE_MONITOR:
 909                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 910                         local->cooked_mntrs--;
 911                         break;
 912                 }
 913
 914                 local->monitors--;
 915                 if (local->monitors == 0) {
 916                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
 917                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 918                 }
 919
 920                 ieee80211_adjust_monitor_flags(sdata, -1);
 921                 break;
 922         case NL80211_IFTYPE_P2P_DEVICE:
 923                 /* relies on synchronize_rcu() below */
 924                 RCU_INIT_POINTER(local->p2p_sdata, NULL);
 925                 /* fall through */
 926         default:
 927                 cancel_work_sync(&sdata->work);
 928                 /*
 929                  * When we get here, the interface is marked down.
 930                  * Free the remaining keys, if there are any
 931                  * (which can happen in AP mode if userspace sets
 932                  * keys before the interface is operating, and maybe
 933                  * also in WDS mode)
 934                  *
 935                  * Force the key freeing to always synchronize_net()
 936                  * to wait for the RX path in case it is using this
 937                  * interface enqueuing frames at this very time on
 938                  * another CPU.
 939                  */
 940                 ieee80211_free_keys(sdata, true);
 941                 skb_queue_purge(&sdata->skb_queue);
 942         }
 943
 944         sdata->bss = NULL;
 945
 946         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 947         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 948                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
 949                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 950                         if (info->control.vif == &sdata->vif) {
 951                                 __skb_unlink(skb, &local->pending[i]);
 952                                 ieee80211_free_txskb(&local->hw, skb);
 953                         }
 954                 }
 955         }
 956         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 957
 958         if (local->open_count == 0)
 959                 ieee80211_clear_tx_pending(local);
 960
 961         /*
 962          * If the interface goes down while suspended, presumably because
 963          * the device was unplugged and that happens before our resume,
 964          * then the driver is already unconfigured and the remainder of
 965          * this function isn't needed.
 966          * XXX: what about WoWLAN? If the device has software state, e.g.
 967          *      memory allocated, it might expect teardown commands from
 968          *      mac80211 here?
 969          */
 970         if (local->suspended) {
 971                 WARN_ON(local->wowlan);
 972                 WARN_ON(rtnl_dereference(local->monitor_sdata));
 973                 return;
 974         }
 975
 976         switch (sdata->vif.type) {
 977         case NL80211_IFTYPE_AP_VLAN:
 978                 break;
 979         case NL80211_IFTYPE_MONITOR:
 980                 if (local->monitors == 0)
 981                         ieee80211_del_virtual_monitor(local);
 982
 983                 mutex_lock(&local->mtx);
 984                 ieee80211_recalc_idle(local);
 985                 mutex_unlock(&local->mtx);
 986
 987                 if (!(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE))
 988                         break;
 989
 990                 /* fall through */
 991         default:
 992                 if (going_down)
 993                         drv_remove_interface(local, sdata);
 994         }
 995
 996         ieee80211_recalc_ps(local, -1);
 997
 998         if (cancel_scan)
 999                 flush_delayed_work(&local->scan_work);
1000
1001         if (local->open_count == 0) {
1002                 ieee80211_stop_device(local);
1003
1004                 /* no reconfiguring after stop! */
1005                 return;
1006         }
1007
1008         /* do after stop to avoid reconfiguring when we stop anyway */
1009         ieee80211_configure_filter(local);
1010         ieee80211_hw_config(local, hw_reconf_flags);
1011
1012         if (local->monitors == local->open_count)
1013                 ieee80211_add_virtual_monitor(local);
1014 }
1015
1016 static int ieee80211_stop(struct net_device *dev)
1017 {
1018         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1019
1020         ieee80211_do_stop(sdata, true);
1021
1022         return 0;
1023 }
1024
1025 static void ieee80211_set_multicast_list(struct net_device *dev)
1026 {
1027         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1028         struct ieee80211_local *local = sdata->local;
1029         int allmulti, promisc, sdata_allmulti, sdata_promisc;
1030
1031         allmulti = !!(dev->flags & IFF_ALLMULTI);
1032         promisc = !!(dev->flags & IFF_PROMISC);
1033         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
1034         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
1035
1036         if (allmulti != sdata_allmulti) {
1037                 if (dev->flags & IFF_ALLMULTI)
1038                         atomic_inc(&local->iff_allmultis);
1039                 else
1040                         atomic_dec(&local->iff_allmultis);
1041                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
1042         }
1043
1044         if (promisc != sdata_promisc) {
1045                 if (dev->flags & IFF_PROMISC)
1046                         atomic_inc(&local->iff_promiscs);
1047                 else
1048                         atomic_dec(&local->iff_promiscs);
1049                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
1050         }
1051         spin_lock_bh(&local->filter_lock);
1052         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
1053         spin_unlock_bh(&local->filter_lock);
1054         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
1055 }
1056
1057 /*
1058  * Called when the netdev is removed or, by the code below, before
1059  * the interface type changes.
1060  */
1061 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
1062 {
1063         int i;
1064
1065         /* free extra data */
1066         ieee80211_free_keys(sdata, false);
1067
1068         ieee80211_debugfs_remove_netdev(sdata);
1069
1070         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1071                 __skb_queue_purge(&sdata->fragments[i].skb_list);
1072         sdata->fragment_next = 0;
1073
1074         if (ieee80211_vif_is_mesh(&sdata->vif))
1075                 mesh_rmc_free(sdata);
1076 }
1077
1078 static void ieee80211_uninit(struct net_device *dev)
1079 {
1080         ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
1081 }
1082
1083 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
1084                                          struct sk_buff *skb,
1085                                          void *accel_priv,
1086                                          select_queue_fallback_t fallback)
1087 {
1088         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
1089 }
1090
1091 static const struct net_device_ops ieee80211_dataif_ops = {
1092         .ndo_open               = ieee80211_open,
1093         .ndo_stop               = ieee80211_stop,
1094         .ndo_uninit             = ieee80211_uninit,
1095         .ndo_start_xmit         = ieee80211_subif_start_xmit,
1096         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1097         .ndo_change_mtu         = ieee80211_change_mtu,
1098         .ndo_set_mac_address    = ieee80211_change_mac,
1099         .ndo_select_queue       = ieee80211_netdev_select_queue,
1100 };
1101
1102 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
1103                                           struct sk_buff *skb,
1104                                           void *accel_priv,
1105                                           select_queue_fallback_t fallback)
1106 {
1107         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1108         struct ieee80211_local *local = sdata->local;
1109         struct ieee80211_hdr *hdr;
1110         struct ieee80211_radiotap_header *rtap = (void *)skb->data;
1111
1112         if (local->hw.queues < IEEE80211_NUM_ACS)
1113                 return 0;
1114
1115         if (skb->len < 4 ||
1116             skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
1117                 return 0; /* doesn't matter, frame will be dropped */
1118
1119         hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
1120
1121         return ieee80211_select_queue_80211(sdata, skb, hdr);
1122 }
1123
1124 static const struct net_device_ops ieee80211_monitorif_ops = {
1125         .ndo_open               = ieee80211_open,
1126         .ndo_stop               = ieee80211_stop,
1127         .ndo_uninit             = ieee80211_uninit,
1128         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
1129         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1130         .ndo_change_mtu         = ieee80211_change_mtu,
1131         .ndo_set_mac_address    = ieee80211_change_mac,
1132         .ndo_select_queue       = ieee80211_monitor_select_queue,
1133 };
1134
1135 static void ieee80211_if_setup(struct net_device *dev)
1136 {
1137         ether_setup(dev);
1138         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1139         dev->netdev_ops = &ieee80211_dataif_ops;
1140         dev->destructor = free_netdev;
1141 }
1142
1143 static void ieee80211_iface_work(struct work_struct *work)
1144 {
1145         struct ieee80211_sub_if_data *sdata =
1146                 container_of(work, struct ieee80211_sub_if_data, work);
1147         struct ieee80211_local *local = sdata->local;
1148         struct sk_buff *skb;
1149         struct sta_info *sta;
1150         struct ieee80211_ra_tid *ra_tid;
1151         struct ieee80211_rx_agg *rx_agg;
1152
1153         if (!ieee80211_sdata_running(sdata))
1154                 return;
1155
1156         if (local->scanning)
1157                 return;
1158
1159         /*
1160          * ieee80211_queue_work() should have picked up most cases,
1161          * here we'll pick the rest.
1162          */
1163         if (WARN(local->suspended,
1164                  "interface work scheduled while going to suspend\n"))
1165                 return;
1166
1167         /* first process frames */
1168         while ((skb = skb_dequeue(&sdata->skb_queue))) {
1169                 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1170
1171                 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
1172                         ra_tid = (void *)&skb->cb;
1173                         ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
1174                                                  ra_tid->tid);
1175                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
1176                         ra_tid = (void *)&skb->cb;
1177                         ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
1178                                                 ra_tid->tid);
1179                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_RX_AGG_START) {
1180                         rx_agg = (void *)&skb->cb;
1181                         mutex_lock(&local->sta_mtx);
1182                         sta = sta_info_get_bss(sdata, rx_agg->addr);
1183                         if (sta)
1184                                 __ieee80211_start_rx_ba_session(sta,
1185                                                 0, 0, 0, 1, rx_agg->tid,
1186                                                 IEEE80211_MAX_AMPDU_BUF,
1187                                                 false, true);
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 }