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, false);
  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                          * Only OCB and monitor mode may coexist
 263                          */
 264                         if ((sdata->vif.type == NL80211_IFTYPE_OCB &&
 265                              nsdata->vif.type != NL80211_IFTYPE_MONITOR) ||
 266                             (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
 267                              nsdata->vif.type == NL80211_IFTYPE_OCB))
 268                                 return -EBUSY;
 269
 270                         /*
 271                          * Allow only a single IBSS interface to be up at any
 272                          * time. This is restricted because beacon distribution
 273                          * cannot work properly if both are in the same IBSS.
 274                          *
 275                          * To remove this restriction we'd have to disallow them
 276                          * from setting the same SSID on different IBSS interfaces
 277                          * belonging to the same hardware. Then, however, we're
 278                          * faced with having to adopt two different TSF timers...
 279                          */
 280                         if (iftype == NL80211_IFTYPE_ADHOC &&
 281                             nsdata->vif.type == NL80211_IFTYPE_ADHOC)
 282                                 return -EBUSY;
 283                         /*
 284                          * will not add another interface while any channel
 285                          * switch is active.
 286                          */
 287                         if (nsdata->vif.csa_active)
 288                                 return -EBUSY;
 289
 290                         /*
 291                          * The remaining checks are only performed for interfaces
 292                          * with the same MAC address.
 293                          */
 294                         if (!ether_addr_equal(sdata->vif.addr,
 295                                               nsdata->vif.addr))
 296                                 continue;
 297
 298                         /*
 299                          * check whether it may have the same address
 300                          */
 301                         if (!identical_mac_addr_allowed(iftype,
 302                                                         nsdata->vif.type))
 303                                 return -ENOTUNIQ;
 304
 305                         /*
 306                          * can only add VLANs to enabled APs
 307                          */
 308                         if (iftype == NL80211_IFTYPE_AP_VLAN &&
 309                             nsdata->vif.type == NL80211_IFTYPE_AP)
 310                                 sdata->bss = &nsdata->u.ap;
 311                 }
 312         }
 313
 314         mutex_lock(&local->chanctx_mtx);
 315         ret = ieee80211_check_combinations(sdata, NULL, 0, 0);
 316         mutex_unlock(&local->chanctx_mtx);
 317         return ret;
 318 }
 319
 320 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata,
 321                                   enum nl80211_iftype iftype)
 322 {
 323         int n_queues = sdata->local->hw.queues;
 324         int i;
 325
 326         if (iftype != NL80211_IFTYPE_P2P_DEVICE) {
 327                 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 328                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
 329                                          IEEE80211_INVAL_HW_QUEUE))
 330                                 return -EINVAL;
 331                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
 332                                          n_queues))
 333                                 return -EINVAL;
 334                 }
 335         }
 336
 337         if ((iftype != NL80211_IFTYPE_AP &&
 338              iftype != NL80211_IFTYPE_P2P_GO &&
 339              iftype != NL80211_IFTYPE_MESH_POINT) ||
 340             !(sdata->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)) {
 341                 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
 342                 return 0;
 343         }
 344
 345         if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
 346                 return -EINVAL;
 347
 348         if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
 349                 return -EINVAL;
 350
 351         return 0;
 352 }
 353
 354 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
 355                                     const int offset)
 356 {
 357         struct ieee80211_local *local = sdata->local;
 358         u32 flags = sdata->u.mntr_flags;
 359
 360 #define ADJUST(_f, _s)  do {                                    \
 361         if (flags & MONITOR_FLAG_##_f)                          \
 362                 local->fif_##_s += offset;                      \
 363         } while (0)
 364
 365         ADJUST(FCSFAIL, fcsfail);
 366         ADJUST(PLCPFAIL, plcpfail);
 367         ADJUST(CONTROL, control);
 368         ADJUST(CONTROL, pspoll);
 369         ADJUST(OTHER_BSS, other_bss);
 370
 371 #undef ADJUST
 372 }
 373
 374 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
 375 {
 376         struct ieee80211_local *local = sdata->local;
 377         int i;
 378
 379         for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 380                 if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
 381                         sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
 382                 else if (local->hw.queues >= IEEE80211_NUM_ACS)
 383                         sdata->vif.hw_queue[i] = i;
 384                 else
 385                         sdata->vif.hw_queue[i] = 0;
 386         }
 387         sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
 388 }
 389
 390 int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
 391 {
 392         struct ieee80211_sub_if_data *sdata;
 393         int ret;
 394
 395         if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
 396                 return 0;
 397
 398         ASSERT_RTNL();
 399
 400         if (local->monitor_sdata)
 401                 return 0;
 402
 403         sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
 404         if (!sdata)
 405                 return -ENOMEM;
 406
 407         /* set up data */
 408         sdata->local = local;
 409         sdata->vif.type = NL80211_IFTYPE_MONITOR;
 410         snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
 411                  wiphy_name(local->hw.wiphy));
 412         sdata->wdev.iftype = NL80211_IFTYPE_MONITOR;
 413
 414         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
 415
 416         ieee80211_set_default_queues(sdata);
 417
 418         ret = drv_add_interface(local, sdata);
 419         if (WARN_ON(ret)) {
 420                 /* ok .. stupid driver, it asked for this! */
 421                 kfree(sdata);
 422                 return ret;
 423         }
 424
 425         ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR);
 426         if (ret) {
 427                 kfree(sdata);
 428                 return ret;
 429         }
 430
 431         mutex_lock(&local->iflist_mtx);
 432         rcu_assign_pointer(local->monitor_sdata, sdata);
 433         mutex_unlock(&local->iflist_mtx);
 434
 435         mutex_lock(&local->mtx);
 436         ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef,
 437                                         IEEE80211_CHANCTX_EXCLUSIVE);
 438         mutex_unlock(&local->mtx);
 439         if (ret) {
 440                 mutex_lock(&local->iflist_mtx);
 441                 RCU_INIT_POINTER(local->monitor_sdata, NULL);
 442                 mutex_unlock(&local->iflist_mtx);
 443                 synchronize_net();
 444                 drv_remove_interface(local, sdata);
 445                 kfree(sdata);
 446                 return ret;
 447         }
 448
 449         return 0;
 450 }
 451
 452 void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
 453 {
 454         struct ieee80211_sub_if_data *sdata;
 455
 456         if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
 457                 return;
 458
 459         ASSERT_RTNL();
 460
 461         mutex_lock(&local->iflist_mtx);
 462
 463         sdata = rcu_dereference_protected(local->monitor_sdata,
 464                                           lockdep_is_held(&local->iflist_mtx));
 465         if (!sdata) {
 466                 mutex_unlock(&local->iflist_mtx);
 467                 return;
 468         }
 469
 470         RCU_INIT_POINTER(local->monitor_sdata, NULL);
 471         mutex_unlock(&local->iflist_mtx);
 472
 473         synchronize_net();
 474
 475         mutex_lock(&local->mtx);
 476         ieee80211_vif_release_channel(sdata);
 477         mutex_unlock(&local->mtx);
 478
 479         drv_remove_interface(local, sdata);
 480
 481         kfree(sdata);
 482 }
 483
 484 /*
 485  * NOTE: Be very careful when changing this function, it must NOT return
 486  * an error on interface type changes that have been pre-checked, so most
 487  * checks should be in ieee80211_check_concurrent_iface.
 488  */
 489 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
 490 {
 491         struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
 492         struct net_device *dev = wdev->netdev;
 493         struct ieee80211_local *local = sdata->local;
 494         struct sta_info *sta;
 495         u32 changed = 0;
 496         int res;
 497         u32 hw_reconf_flags = 0;
 498
 499         switch (sdata->vif.type) {
 500         case NL80211_IFTYPE_WDS:
 501                 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
 502                         return -ENOLINK;
 503                 break;
 504         case NL80211_IFTYPE_AP_VLAN: {
 505                 struct ieee80211_sub_if_data *master;
 506
 507                 if (!sdata->bss)
 508                         return -ENOLINK;
 509
 510                 mutex_lock(&local->mtx);
 511                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
 512                 mutex_unlock(&local->mtx);
 513
 514                 master = container_of(sdata->bss,
 515                                       struct ieee80211_sub_if_data, u.ap);
 516                 sdata->control_port_protocol =
 517                         master->control_port_protocol;
 518                 sdata->control_port_no_encrypt =
 519                         master->control_port_no_encrypt;
 520                 sdata->vif.cab_queue = master->vif.cab_queue;
 521                 memcpy(sdata->vif.hw_queue, master->vif.hw_queue,
 522                        sizeof(sdata->vif.hw_queue));
 523                 sdata->vif.bss_conf.chandef = master->vif.bss_conf.chandef;
 524                 break;
 525                 }
 526         case NL80211_IFTYPE_AP:
 527                 sdata->bss = &sdata->u.ap;
 528                 break;
 529         case NL80211_IFTYPE_MESH_POINT:
 530         case NL80211_IFTYPE_STATION:
 531         case NL80211_IFTYPE_MONITOR:
 532         case NL80211_IFTYPE_ADHOC:
 533         case NL80211_IFTYPE_P2P_DEVICE:
 534         case NL80211_IFTYPE_OCB:
 535                 /* no special treatment */
 536                 break;
 537         case NL80211_IFTYPE_UNSPECIFIED:
 538         case NUM_NL80211_IFTYPES:
 539         case NL80211_IFTYPE_P2P_CLIENT:
 540         case NL80211_IFTYPE_P2P_GO:
 541                 /* cannot happen */
 542                 WARN_ON(1);
 543                 break;
 544         }
 545
 546         if (local->open_count == 0) {
 547                 res = drv_start(local);
 548                 if (res)
 549                         goto err_del_bss;
 550                 /* we're brought up, everything changes */
 551                 hw_reconf_flags = ~0;
 552                 ieee80211_led_radio(local, true);
 553                 ieee80211_mod_tpt_led_trig(local,
 554                                            IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
 555         }
 556
 557         /*
 558          * Copy the hopefully now-present MAC address to
 559          * this interface, if it has the special null one.
 560          */
 561         if (dev && is_zero_ether_addr(dev->dev_addr)) {
 562                 memcpy(dev->dev_addr,
 563                        local->hw.wiphy->perm_addr,
 564                        ETH_ALEN);
 565                 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
 566
 567                 if (!is_valid_ether_addr(dev->dev_addr)) {
 568                         res = -EADDRNOTAVAIL;
 569                         goto err_stop;
 570                 }
 571         }
 572
 573         switch (sdata->vif.type) {
 574         case NL80211_IFTYPE_AP_VLAN:
 575                 /* no need to tell driver, but set carrier and chanctx */
 576                 if (rtnl_dereference(sdata->bss->beacon)) {
 577                         ieee80211_vif_vlan_copy_chanctx(sdata);
 578                         netif_carrier_on(dev);
 579                 } else {
 580                         netif_carrier_off(dev);
 581                 }
 582                 break;
 583         case NL80211_IFTYPE_MONITOR:
 584                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 585                         local->cooked_mntrs++;
 586                         break;
 587                 }
 588
 589                 if (sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE) {
 590                         res = drv_add_interface(local, sdata);
 591                         if (res)
 592                                 goto err_stop;
 593                 } else if (local->monitors == 0 && local->open_count == 0) {
 594                         res = ieee80211_add_virtual_monitor(local);
 595                         if (res)
 596                                 goto err_stop;
 597                 }
 598
 599                 /* must be before the call to ieee80211_configure_filter */
 600                 local->monitors++;
 601                 if (local->monitors == 1) {
 602                         local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
 603                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 604                 }
 605
 606                 ieee80211_adjust_monitor_flags(sdata, 1);
 607                 ieee80211_configure_filter(local);
 608                 mutex_lock(&local->mtx);
 609                 ieee80211_recalc_idle(local);
 610                 mutex_unlock(&local->mtx);
 611
 612                 netif_carrier_on(dev);
 613                 break;
 614         default:
 615                 if (coming_up) {
 616                         ieee80211_del_virtual_monitor(local);
 617
 618                         res = drv_add_interface(local, sdata);
 619                         if (res)
 620                                 goto err_stop;
 621                         res = ieee80211_check_queues(sdata,
 622                                 ieee80211_vif_type_p2p(&sdata->vif));
 623                         if (res)
 624                                 goto err_del_interface;
 625                 }
 626
 627                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
 628                         local->fif_pspoll++;
 629                         local->fif_probe_req++;
 630
 631                         ieee80211_configure_filter(local);
 632                 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 633                         local->fif_probe_req++;
 634                 }
 635
 636                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
 637                         changed |= ieee80211_reset_erp_info(sdata);
 638                 ieee80211_bss_info_change_notify(sdata, changed);
 639
 640                 switch (sdata->vif.type) {
 641                 case NL80211_IFTYPE_STATION:
 642                 case NL80211_IFTYPE_ADHOC:
 643                 case NL80211_IFTYPE_AP:
 644                 case NL80211_IFTYPE_MESH_POINT:
 645                 case NL80211_IFTYPE_OCB:
 646                         netif_carrier_off(dev);
 647                         break;
 648                 case NL80211_IFTYPE_WDS:
 649                 case NL80211_IFTYPE_P2P_DEVICE:
 650                         break;
 651                 default:
 652                         /* not reached */
 653                         WARN_ON(1);
 654                 }
 655
 656                 /*
 657                  * set default queue parameters so drivers don't
 658                  * need to initialise the hardware if the hardware
 659                  * doesn't start up with sane defaults
 660                  */
 661                 ieee80211_set_wmm_default(sdata, true);
 662         }
 663
 664         set_bit(SDATA_STATE_RUNNING, &sdata->state);
 665
 666         if (sdata->vif.type == NL80211_IFTYPE_WDS) {
 667                 /* Create STA entry for the WDS peer */
 668                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
 669                                      GFP_KERNEL);
 670                 if (!sta) {
 671                         res = -ENOMEM;
 672                         goto err_del_interface;
 673                 }
 674
 675                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
 676                 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
 677                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
 678
 679                 res = sta_info_insert(sta);
 680                 if (res) {
 681                         /* STA has been freed */
 682                         goto err_del_interface;
 683                 }
 684
 685                 rate_control_rate_init(sta);
 686                 netif_carrier_on(dev);
 687         } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
 688                 rcu_assign_pointer(local->p2p_sdata, sdata);
 689         }
 690
 691         /*
 692          * set_multicast_list will be invoked by the networking core
 693          * which will check whether any increments here were done in
 694          * error and sync them down to the hardware as filter flags.
 695          */
 696         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 697                 atomic_inc(&local->iff_allmultis);
 698
 699         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 700                 atomic_inc(&local->iff_promiscs);
 701
 702         if (coming_up)
 703                 local->open_count++;
 704
 705         if (hw_reconf_flags)
 706                 ieee80211_hw_config(local, hw_reconf_flags);
 707
 708         ieee80211_recalc_ps(local, -1);
 709
 710         if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
 711             sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 712                 /* XXX: for AP_VLAN, actually track AP queues */
 713                 netif_tx_start_all_queues(dev);
 714         } else if (dev) {
 715                 unsigned long flags;
 716                 int n_acs = IEEE80211_NUM_ACS;
 717                 int ac;
 718
 719                 if (local->hw.queues < IEEE80211_NUM_ACS)
 720                         n_acs = 1;
 721
 722                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 723                 if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE ||
 724                     (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 &&
 725                      skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) {
 726                         for (ac = 0; ac < n_acs; ac++) {
 727                                 int ac_queue = sdata->vif.hw_queue[ac];
 728
 729                                 if (local->queue_stop_reasons[ac_queue] == 0 &&
 730                                     skb_queue_empty(&local->pending[ac_queue]))
 731                                         netif_start_subqueue(dev, ac);
 732                         }
 733                 }
 734                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 735         }
 736
 737         return 0;
 738  err_del_interface:
 739         drv_remove_interface(local, sdata);
 740  err_stop:
 741         if (!local->open_count)
 742                 drv_stop(local);
 743  err_del_bss:
 744         sdata->bss = NULL;
 745         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 746                 mutex_lock(&local->mtx);
 747                 list_del(&sdata->u.vlan.list);
 748                 mutex_unlock(&local->mtx);
 749         }
 750         /* might already be clear but that doesn't matter */
 751         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 752         return res;
 753 }
 754
 755 static int ieee80211_open(struct net_device *dev)
 756 {
 757         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 758         int err;
 759
 760         /* fail early if user set an invalid address */
 761         if (!is_valid_ether_addr(dev->dev_addr))
 762                 return -EADDRNOTAVAIL;
 763
 764         err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
 765         if (err)
 766                 return err;
 767
 768         return ieee80211_do_open(&sdata->wdev, true);
 769 }
 770
 771 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
 772                               bool going_down)
 773 {
 774         struct ieee80211_local *local = sdata->local;
 775         unsigned long flags;
 776         struct sk_buff *skb, *tmp;
 777         u32 hw_reconf_flags = 0;
 778         int i, flushed;
 779         struct ps_data *ps;
 780         struct cfg80211_chan_def chandef;
 781         bool cancel_scan;
 782
 783         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 784
 785         cancel_scan = rcu_access_pointer(local->scan_sdata) == sdata;
 786         if (cancel_scan)
 787                 ieee80211_scan_cancel(local);
 788
 789         /*
 790          * Stop TX on this interface first.
 791          */
 792         if (sdata->dev)
 793                 netif_tx_stop_all_queues(sdata->dev);
 794
 795         ieee80211_roc_purge(local, sdata);
 796
 797         switch (sdata->vif.type) {
 798         case NL80211_IFTYPE_STATION:
 799                 ieee80211_mgd_stop(sdata);
 800                 break;
 801         case NL80211_IFTYPE_ADHOC:
 802                 ieee80211_ibss_stop(sdata);
 803                 break;
 804         case NL80211_IFTYPE_AP:
 805                 cancel_work_sync(&sdata->u.ap.request_smps_work);
 806                 break;
 807         default:
 808                 break;
 809         }
 810
 811         /*
 812          * Remove all stations associated with this interface.
 813          *
 814          * This must be done before calling ops->remove_interface()
 815          * because otherwise we can later invoke ops->sta_notify()
 816          * whenever the STAs are removed, and that invalidates driver
 817          * assumptions about always getting a vif pointer that is valid
 818          * (because if we remove a STA after ops->remove_interface()
 819          * the driver will have removed the vif info already!)
 820          *
 821          * This is relevant only in WDS mode, in all other modes we've
 822          * already removed all stations when disconnecting or similar,
 823          * so warn otherwise.
 824          */
 825         flushed = sta_info_flush(sdata);
 826         WARN_ON_ONCE((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) ||
 827                      (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1));
 828
 829         /* don't count this interface for promisc/allmulti while it is down */
 830         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 831                 atomic_dec(&local->iff_allmultis);
 832
 833         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 834                 atomic_dec(&local->iff_promiscs);
 835
 836         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 837                 local->fif_pspoll--;
 838                 local->fif_probe_req--;
 839         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 840                 local->fif_probe_req--;
 841         }
 842
 843         if (sdata->dev) {
 844                 netif_addr_lock_bh(sdata->dev);
 845                 spin_lock_bh(&local->filter_lock);
 846                 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
 847                                  sdata->dev->addr_len);
 848                 spin_unlock_bh(&local->filter_lock);
 849                 netif_addr_unlock_bh(sdata->dev);
 850         }
 851
 852         del_timer_sync(&local->dynamic_ps_timer);
 853         cancel_work_sync(&local->dynamic_ps_enable_work);
 854
 855         cancel_work_sync(&sdata->recalc_smps);
 856         sdata_lock(sdata);
 857         mutex_lock(&local->mtx);
 858         sdata->vif.csa_active = false;
 859         if (sdata->vif.type == NL80211_IFTYPE_STATION)
 860                 sdata->u.mgd.csa_waiting_bcn = false;
 861         if (sdata->csa_block_tx) {
 862                 ieee80211_wake_vif_queues(local, sdata,
 863                                           IEEE80211_QUEUE_STOP_REASON_CSA);
 864                 sdata->csa_block_tx = false;
 865         }
 866         mutex_unlock(&local->mtx);
 867         sdata_unlock(sdata);
 868
 869         cancel_work_sync(&sdata->csa_finalize_work);
 870
 871         cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
 872
 873         if (sdata->wdev.cac_started) {
 874                 chandef = sdata->vif.bss_conf.chandef;
 875                 WARN_ON(local->suspended);
 876                 mutex_lock(&local->mtx);
 877                 ieee80211_vif_release_channel(sdata);
 878                 mutex_unlock(&local->mtx);
 879                 cfg80211_cac_event(sdata->dev, &chandef,
 880                                    NL80211_RADAR_CAC_ABORTED,
 881                                    GFP_KERNEL);
 882         }
 883
 884         /* APs need special treatment */
 885         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 886                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
 887
 888                 /* down all dependent devices, that is VLANs */
 889                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
 890                                          u.vlan.list)
 891                         dev_close(vlan->dev);
 892                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
 893         } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 894                 /* remove all packets in parent bc_buf pointing to this dev */
 895                 ps = &sdata->bss->ps;
 896
 897                 spin_lock_irqsave(&ps->bc_buf.lock, flags);
 898                 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
 899                         if (skb->dev == sdata->dev) {
 900                                 __skb_unlink(skb, &ps->bc_buf);
 901                                 local->total_ps_buffered--;
 902                                 ieee80211_free_txskb(&local->hw, skb);
 903                         }
 904                 }
 905                 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
 906         }
 907
 908         if (going_down)
 909                 local->open_count--;
 910
 911         switch (sdata->vif.type) {
 912         case NL80211_IFTYPE_AP_VLAN:
 913                 mutex_lock(&local->mtx);
 914                 list_del(&sdata->u.vlan.list);
 915                 mutex_unlock(&local->mtx);
 916                 RCU_INIT_POINTER(sdata->vif.chanctx_conf, NULL);
 917                 /* see comment in the default case below */
 918                 ieee80211_free_keys(sdata, true);
 919                 /* no need to tell driver */
 920                 break;
 921         case NL80211_IFTYPE_MONITOR:
 922                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 923                         local->cooked_mntrs--;
 924                         break;
 925                 }
 926
 927                 local->monitors--;
 928                 if (local->monitors == 0) {
 929                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
 930                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 931                 }
 932
 933                 ieee80211_adjust_monitor_flags(sdata, -1);
 934                 break;
 935         case NL80211_IFTYPE_P2P_DEVICE:
 936                 /* relies on synchronize_rcu() below */
 937                 RCU_INIT_POINTER(local->p2p_sdata, NULL);
 938                 /* fall through */
 939         default:
 940                 cancel_work_sync(&sdata->work);
 941                 /*
 942                  * When we get here, the interface is marked down.
 943                  * Free the remaining keys, if there are any
 944                  * (which can happen in AP mode if userspace sets
 945                  * keys before the interface is operating, and maybe
 946                  * also in WDS mode)
 947                  *
 948                  * Force the key freeing to always synchronize_net()
 949                  * to wait for the RX path in case it is using this
 950                  * interface enqueuing frames at this very time on
 951                  * another CPU.
 952                  */
 953                 ieee80211_free_keys(sdata, true);
 954                 skb_queue_purge(&sdata->skb_queue);
 955         }
 956
 957         sdata->bss = NULL;
 958
 959         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 960         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 961                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
 962                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 963                         if (info->control.vif == &sdata->vif) {
 964                                 __skb_unlink(skb, &local->pending[i]);
 965                                 ieee80211_free_txskb(&local->hw, skb);
 966                         }
 967                 }
 968         }
 969         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 970
 971         if (local->open_count == 0)
 972                 ieee80211_clear_tx_pending(local);
 973
 974         /*
 975          * If the interface goes down while suspended, presumably because
 976          * the device was unplugged and that happens before our resume,
 977          * then the driver is already unconfigured and the remainder of
 978          * this function isn't needed.
 979          * XXX: what about WoWLAN? If the device has software state, e.g.
 980          *      memory allocated, it might expect teardown commands from
 981          *      mac80211 here?
 982          */
 983         if (local->suspended) {
 984                 WARN_ON(local->wowlan);
 985                 WARN_ON(rtnl_dereference(local->monitor_sdata));
 986                 return;
 987         }
 988
 989         switch (sdata->vif.type) {
 990         case NL80211_IFTYPE_AP_VLAN:
 991                 break;
 992         case NL80211_IFTYPE_MONITOR:
 993                 if (local->monitors == 0)
 994                         ieee80211_del_virtual_monitor(local);
 995
 996                 mutex_lock(&local->mtx);
 997                 ieee80211_recalc_idle(local);
 998                 mutex_unlock(&local->mtx);
 999
1000                 if (!(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE))
1001                         break;
1002
1003                 /* fall through */
1004         default:
1005                 if (going_down)
1006                         drv_remove_interface(local, sdata);
1007         }
1008
1009         ieee80211_recalc_ps(local, -1);
1010
1011         if (cancel_scan)
1012                 flush_delayed_work(&local->scan_work);
1013
1014         if (local->open_count == 0) {
1015                 ieee80211_stop_device(local);
1016
1017                 /* no reconfiguring after stop! */
1018                 return;
1019         }
1020
1021         /* do after stop to avoid reconfiguring when we stop anyway */
1022         ieee80211_configure_filter(local);
1023         ieee80211_hw_config(local, hw_reconf_flags);
1024
1025         if (local->monitors == local->open_count)
1026                 ieee80211_add_virtual_monitor(local);
1027 }
1028
1029 static int ieee80211_stop(struct net_device *dev)
1030 {
1031         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1032
1033         ieee80211_do_stop(sdata, true);
1034
1035         return 0;
1036 }
1037
1038 static void ieee80211_set_multicast_list(struct net_device *dev)
1039 {
1040         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1041         struct ieee80211_local *local = sdata->local;
1042         int allmulti, promisc, sdata_allmulti, sdata_promisc;
1043
1044         allmulti = !!(dev->flags & IFF_ALLMULTI);
1045         promisc = !!(dev->flags & IFF_PROMISC);
1046         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
1047         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
1048
1049         if (allmulti != sdata_allmulti) {
1050                 if (dev->flags & IFF_ALLMULTI)
1051                         atomic_inc(&local->iff_allmultis);
1052                 else
1053                         atomic_dec(&local->iff_allmultis);
1054                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
1055         }
1056
1057         if (promisc != sdata_promisc) {
1058                 if (dev->flags & IFF_PROMISC)
1059                         atomic_inc(&local->iff_promiscs);
1060                 else
1061                         atomic_dec(&local->iff_promiscs);
1062                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
1063         }
1064         spin_lock_bh(&local->filter_lock);
1065         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
1066         spin_unlock_bh(&local->filter_lock);
1067         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
1068 }
1069
1070 /*
1071  * Called when the netdev is removed or, by the code below, before
1072  * the interface type changes.
1073  */
1074 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
1075 {
1076         int i;
1077
1078         /* free extra data */
1079         ieee80211_free_keys(sdata, false);
1080
1081         ieee80211_debugfs_remove_netdev(sdata);
1082
1083         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1084                 __skb_queue_purge(&sdata->fragments[i].skb_list);
1085         sdata->fragment_next = 0;
1086
1087         if (ieee80211_vif_is_mesh(&sdata->vif))
1088                 mesh_rmc_free(sdata);
1089 }
1090
1091 static void ieee80211_uninit(struct net_device *dev)
1092 {
1093         ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
1094 }
1095
1096 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
1097                                          struct sk_buff *skb,
1098                                          void *accel_priv,
1099                                          select_queue_fallback_t fallback)
1100 {
1101         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
1102 }
1103
1104 static const struct net_device_ops ieee80211_dataif_ops = {
1105         .ndo_open               = ieee80211_open,
1106         .ndo_stop               = ieee80211_stop,
1107         .ndo_uninit             = ieee80211_uninit,
1108         .ndo_start_xmit         = ieee80211_subif_start_xmit,
1109         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1110         .ndo_change_mtu         = ieee80211_change_mtu,
1111         .ndo_set_mac_address    = ieee80211_change_mac,
1112         .ndo_select_queue       = ieee80211_netdev_select_queue,
1113 };
1114
1115 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
1116                                           struct sk_buff *skb,
1117                                           void *accel_priv,
1118                                           select_queue_fallback_t fallback)
1119 {
1120         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1121         struct ieee80211_local *local = sdata->local;
1122         struct ieee80211_hdr *hdr;
1123         struct ieee80211_radiotap_header *rtap = (void *)skb->data;
1124
1125         if (local->hw.queues < IEEE80211_NUM_ACS)
1126                 return 0;
1127
1128         if (skb->len < 4 ||
1129             skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
1130                 return 0; /* doesn't matter, frame will be dropped */
1131
1132         hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
1133
1134         return ieee80211_select_queue_80211(sdata, skb, hdr);
1135 }
1136
1137 static const struct net_device_ops ieee80211_monitorif_ops = {
1138         .ndo_open               = ieee80211_open,
1139         .ndo_stop               = ieee80211_stop,
1140         .ndo_uninit             = ieee80211_uninit,
1141         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
1142         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1143         .ndo_change_mtu         = ieee80211_change_mtu,
1144         .ndo_set_mac_address    = ieee80211_change_mac,
1145         .ndo_select_queue       = ieee80211_monitor_select_queue,
1146 };
1147
1148 static void ieee80211_if_setup(struct net_device *dev)
1149 {
1150         ether_setup(dev);
1151         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1152         dev->netdev_ops = &ieee80211_dataif_ops;
1153         dev->destructor = free_netdev;
1154 }
1155
1156 static void ieee80211_iface_work(struct work_struct *work)
1157 {
1158         struct ieee80211_sub_if_data *sdata =
1159                 container_of(work, struct ieee80211_sub_if_data, work);
1160         struct ieee80211_local *local = sdata->local;
1161         struct sk_buff *skb;
1162         struct sta_info *sta;
1163         struct ieee80211_ra_tid *ra_tid;
1164         struct ieee80211_rx_agg *rx_agg;
1165
1166         if (!ieee80211_sdata_running(sdata))
1167                 return;
1168
1169         if (local->scanning)
1170                 return;
1171
1172         /*
1173          * ieee80211_queue_work() should have picked up most cases,
1174          * here we'll pick the rest.
1175          */
1176         if (WARN(local->suspended,
1177                  "interface work scheduled while going to suspend\n"))
1178                 return;
1179
1180         /* first process frames */
1181         while ((skb = skb_dequeue(&sdata->skb_queue))) {
1182                 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1183
1184                 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
1185                         ra_tid = (void *)&skb->cb;
1186                         ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
1187                                                  ra_tid->tid);
1188                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
1189                         ra_tid = (void *)&skb->cb;
1190                         ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
1191                                                 ra_tid->tid);
1192                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_RX_AGG_START) {
1193                         rx_agg = (void *)&skb->cb;
1194                         mutex_lock(&local->sta_mtx);
1195                         sta = sta_info_get_bss(sdata, rx_agg->addr);
1196                         if (sta)
1197                                 __ieee80211_start_rx_ba_session(sta,
1198                                                 0, 0, 0, 1, rx_agg->tid,
1199                                                 IEEE80211_MAX_AMPDU_BUF,
1200                                                 false, true);
1201                         mutex_unlock(&local->sta_mtx);
1202                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_RX_AGG_STOP) {
1203                         rx_agg = (void *)&skb->cb;
1204                         mutex_lock(&local->sta_mtx);
1205                         sta = sta_info_get_bss(sdata, rx_agg->addr);
1206                         if (sta)
1207                                 __ieee80211_stop_rx_ba_session(sta,
1208                                                         rx_agg->tid,
1209                                                         WLAN_BACK_RECIPIENT, 0,
1210                                                         false);
1211                         mutex_unlock(&local->sta_mtx);
1212                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_TDLS_CHSW) {
1213                         ieee80211_process_tdls_channel_switch(sdata, skb);
1214                 } else if (ieee80211_is_action(mgmt->frame_control) &&
1215                            mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1216                         int len = skb->len;
1217
1218                         mutex_lock(&local->sta_mtx);
1219                         sta = sta_info_get_bss(sdata, mgmt->sa);
1220                         if (sta) {
1221                                 switch (mgmt->u.action.u.addba_req.action_code) {
1222                                 case WLAN_ACTION_ADDBA_REQ:
1223                                         ieee80211_process_addba_request(
1224                                                         local, sta, mgmt, len);
1225                                         break;
1226                                 case WLAN_ACTION_ADDBA_RESP:
1227                                         ieee80211_process_addba_resp(local, sta,
1228                                                                      mgmt, len);
1229                                         break;
1230                                 case WLAN_ACTION_DELBA:
1231                                         ieee80211_process_delba(sdata, sta,
1232                                                                 mgmt, len);
1233                                         break;
1234                                 default:
1235                                         WARN_ON(1);
1236                                         break;
1237                                 }
1238                         }
1239                         mutex_unlock(&local->sta_mtx);
1240                 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1241                         struct ieee80211_hdr *hdr = (void *)mgmt;
1242                         /*
1243                          * So the frame isn't mgmt, but frame_control
1244                          * is at the right place anyway, of course, so
1245                          * the if statement is correct.
1246                          *
1247                          * Warn if we have other data frame types here,
1248                          * they must not get here.
1249                          */
1250                         WARN_ON(hdr->frame_control &
1251                                         cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1252                         WARN_ON(!(hdr->seq_ctrl &
1253                                         cpu_to_le16(IEEE80211_SCTL_FRAG)));
1254                         /*
1255                          * This was a fragment of a frame, received while
1256                          * a block-ack session was active. That cannot be
1257                          * right, so terminate the session.
1258                          */
1259                         mutex_lock(&local->sta_mtx);
1260                         sta = sta_info_get_bss(sdata, mgmt->sa);
1261                         if (sta) {
1262                                 u16 tid = *ieee80211_get_qos_ctl(hdr) &
1263                                                 IEEE80211_QOS_CTL_TID_MASK;
1264
1265                                 __ieee80211_stop_rx_ba_session(
1266                                         sta, tid, WLAN_BACK_RECIPIENT,
1267                                         WLAN_REASON_QSTA_REQUIRE_SETUP,
1268                                         true);
1269                         }
1270                         mutex_unlock(&local->sta_mtx);
1271                 } else switch (sdata->vif.type) {
1272                 case NL80211_IFTYPE_STATION:
1273                         ieee80211_sta_rx_queued_mgmt(sdata, skb);
1274                         break;
1275                 case NL80211_IFTYPE_ADHOC:
1276                         ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1277                         break;
1278                 case NL80211_IFTYPE_MESH_POINT:
1279                         if (!ieee80211_vif_is_mesh(&sdata->vif))
1280                                 break;
1281                         ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1282                         break;
1283                 default:
1284                         WARN(1, "frame for unexpected interface type");
1285                         break;
1286                 }
1287
1288                 kfree_skb(skb);
1289         }
1290
1291         /* then other type-dependent work */
1292         switch (sdata->vif.type) {
1293         case NL80211_IFTYPE_STATION:
1294                 ieee80211_sta_work(sdata);
1295                 break;
1296         case NL80211_IFTYPE_ADHOC:
1297                 ieee80211_ibss_work(sdata);
1298                 break;
1299         case NL80211_IFTYPE_MESH_POINT:
1300                 if (!ieee80211_vif_is_mesh(&sdata->vif))
1301                         break;
1302                 ieee80211_mesh_work(sdata);
1303                 break;
1304         case NL80211_IFTYPE_OCB:
1305                 ieee80211_ocb_work(sdata);
1306                 break;
1307         default:
1308                 break;
1309         }
1310 }
1311
1312 static void ieee80211_recalc_smps_work(struct work_struct *work)
1313 {
1314         struct ieee80211_sub_if_data *sdata =
1315                 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1316
1317         ieee80211_recalc_smps(sdata);
1318 }
1319
1320 /*
1321  * Helper function to initialise an interface to a specific type.
1322  */
1323 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1324                                   enum nl80211_iftype type)
1325 {
1326         static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff,
1327                                                     0xff, 0xff, 0xff};
1328
1329         /* clear type-dependent union */
1330         memset(&sdata->u, 0, sizeof(sdata->u));
1331
1332         /* and set some type-dependent values */
1333         sdata->vif.type = type;
1334         sdata->vif.p2p = false;
1335         sdata->wdev.iftype = type;
1336
1337         sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1338         sdata->control_port_no_encrypt = false;
1339         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1340         sdata->vif.bss_conf.idle = true;
1341
1342         sdata->noack_map = 0;
1343
1344         /* only monitor/p2p-device differ */
1345         if (sdata->dev) {
1346                 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1347                 sdata->dev->type = ARPHRD_ETHER;
1348         }
1349
1350         skb_queue_head_init(&sdata->skb_queue);
1351         INIT_WORK(&sdata->work, ieee80211_iface_work);
1352         INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1353         INIT_WORK(&sdata->csa_finalize_work, ieee80211_csa_finalize_work);
1354         INIT_LIST_HEAD(&sdata->assigned_chanctx_list);
1355         INIT_LIST_HEAD(&sdata->reserved_chanctx_list);
1356
1357         switch (type) {
1358         case NL80211_IFTYPE_P2P_GO:
1359                 type = NL80211_IFTYPE_AP;
1360                 sdata->vif.type = type;
1361                 sdata->vif.p2p = true;
1362                 /* fall through */
1363         case NL80211_IFTYPE_AP:
1364                 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1365                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1366                 INIT_WORK(&sdata->u.ap.request_smps_work,
1367                           ieee80211_request_smps_ap_work);
1368                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1369                 sdata->u.ap.req_smps = IEEE80211_SMPS_OFF;
1370                 break;
1371         case NL80211_IFTYPE_P2P_CLIENT:
1372                 type = NL80211_IFTYPE_STATION;
1373                 sdata->vif.type = type;
1374                 sdata->vif.p2p = true;
1375                 /* fall through */
1376         case NL80211_IFTYPE_STATION:
1377                 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1378                 ieee80211_sta_setup_sdata(sdata);
1379                 break;
1380         case NL80211_IFTYPE_OCB:
1381                 sdata->vif.bss_conf.bssid = bssid_wildcard;
1382                 ieee80211_ocb_setup_sdata(sdata);
1383                 break;
1384         case NL80211_IFTYPE_ADHOC:
1385                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1386                 ieee80211_ibss_setup_sdata(sdata);
1387                 break;
1388         case NL80211_IFTYPE_MESH_POINT:
1389                 if (ieee80211_vif_is_mesh(&sdata->vif))
1390                         ieee80211_mesh_init_sdata(sdata);
1391                 break;
1392         case NL80211_IFTYPE_MONITOR:
1393                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1394                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1395                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
1396                                       MONITOR_FLAG_OTHER_BSS;
1397                 break;
1398         case NL80211_IFTYPE_WDS:
1399                 sdata->vif.bss_conf.bssid = NULL;
1400                 break;
1401         case NL80211_IFTYPE_AP_VLAN:
1402         case NL80211_IFTYPE_P2P_DEVICE:
1403                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1404                 break;
1405         case NL80211_IFTYPE_UNSPECIFIED:
1406         case NUM_NL80211_IFTYPES:
1407                 BUG();
1408                 break;
1409         }
1410
1411         ieee80211_debugfs_add_netdev(sdata);
1412 }
1413
1414 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1415                                            enum nl80211_iftype type)
1416 {
1417         struct ieee80211_local *local = sdata->local;
1418         int ret, err;
1419         enum nl80211_iftype internal_type = type;
1420         bool p2p = false;
1421
1422         ASSERT_RTNL();
1423
1424         if (!local->ops->change_interface)
1425                 return -EBUSY;
1426
1427         switch (sdata->vif.type) {
1428         case NL80211_IFTYPE_AP:
1429         case NL80211_IFTYPE_STATION:
1430         case NL80211_IFTYPE_ADHOC:
1431         case NL80211_IFTYPE_OCB:
1432                 /*
1433                  * Could maybe also all others here?
1434                  * Just not sure how that interacts
1435                  * with the RX/config path e.g. for
1436                  * mesh.
1437                  */
1438                 break;
1439         default:
1440                 return -EBUSY;
1441         }
1442
1443         switch (type) {
1444         case NL80211_IFTYPE_AP:
1445         case NL80211_IFTYPE_STATION:
1446         case NL80211_IFTYPE_ADHOC:
1447         case NL80211_IFTYPE_OCB:
1448                 /*
1449                  * Could probably support everything
1450                  * but WDS here (WDS do_open can fail
1451                  * under memory pressure, which this
1452                  * code isn't prepared to handle).
1453                  */
1454                 break;
1455         case NL80211_IFTYPE_P2P_CLIENT:
1456                 p2p = true;
1457                 internal_type = NL80211_IFTYPE_STATION;
1458                 break;
1459         case NL80211_IFTYPE_P2P_GO:
1460                 p2p = true;
1461                 internal_type = NL80211_IFTYPE_AP;
1462                 break;
1463         default:
1464                 return -EBUSY;
1465         }
1466
1467         ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1468         if (ret)
1469                 return ret;
1470
1471         ieee80211_do_stop(sdata, false);
1472
1473         ieee80211_teardown_sdata(sdata);
1474
1475         ret = drv_change_interface(local, sdata, internal_type, p2p);
1476         if (ret)
1477                 type = ieee80211_vif_type_p2p(&sdata->vif);
1478
1479         /*
1480          * Ignore return value here, there's not much we can do since
1481          * the driver changed the interface type internally already.
1482          * The warnings will hopefully make driver authors fix it :-)
1483          */
1484         ieee80211_check_queues(sdata, type);
1485
1486         ieee80211_setup_sdata(sdata, type);
1487
1488         err = ieee80211_do_open(&sdata->wdev, false);
1489         WARN(err, "type change: do_open returned %d", err);
1490
1491         return ret;
1492 }
1493
1494 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1495                              enum nl80211_iftype type)
1496 {
1497         int ret;
1498
1499         ASSERT_RTNL();
1500
1501         if (type == ieee80211_vif_type_p2p(&sdata->vif))
1502                 return 0;
1503
1504         if (ieee80211_sdata_running(sdata)) {
1505                 ret = ieee80211_runtime_change_iftype(sdata, type);
1506                 if (ret)
1507                         return ret;
1508         } else {
1509                 /* Purge and reset type-dependent state. */
1510                 ieee80211_teardown_sdata(sdata);
1511                 ieee80211_setup_sdata(sdata, type);
1512         }
1513
1514         /* reset some values that shouldn't be kept across type changes */
1515         sdata->drop_unencrypted = 0;
1516         if (type == NL80211_IFTYPE_STATION)
1517                 sdata->u.mgd.use_4addr = false;
1518
1519         return 0;
1520 }
1521
1522 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1523                                        u8 *perm_addr, enum nl80211_iftype type)
1524 {
1525         struct ieee80211_sub_if_data *sdata;
1526         u64 mask, start, addr, val, inc;
1527         u8 *m;
1528         u8 tmp_addr[ETH_ALEN];
1529         int i;
1530
1531         /* default ... something at least */
1532         memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1533
1534         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1535             local->hw.wiphy->n_addresses <= 1)
1536                 return;
1537
1538         mutex_lock(&local->iflist_mtx);
1539
1540         switch (type) {
1541         case NL80211_IFTYPE_MONITOR:
1542                 /* doesn't matter */
1543                 break;
1544         case NL80211_IFTYPE_WDS:
1545         case NL80211_IFTYPE_AP_VLAN:
1546                 /* match up with an AP interface */
1547                 list_for_each_entry(sdata, &local->interfaces, list) {
1548                         if (sdata->vif.type != NL80211_IFTYPE_AP)
1549                                 continue;
1550                         memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1551                         break;
1552                 }
1553                 /* keep default if no AP interface present */
1554                 break;
1555         case NL80211_IFTYPE_P2P_CLIENT:
1556         case NL80211_IFTYPE_P2P_GO:
1557                 if (local->hw.flags & IEEE80211_HW_P2P_DEV_ADDR_FOR_INTF) {
1558                         list_for_each_entry(sdata, &local->interfaces, list) {
1559                                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1560                                         continue;
1561                                 if (!ieee80211_sdata_running(sdata))
1562                                         continue;
1563                                 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1564                                 goto out_unlock;
1565                         }
1566                 }
1567                 /* otherwise fall through */
1568         default:
1569                 /* assign a new address if possible -- try n_addresses first */
1570                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1571                         bool used = false;
1572
1573                         list_for_each_entry(sdata, &local->interfaces, list) {
1574                                 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr,
1575                                                      sdata->vif.addr)) {
1576                                         used = true;
1577                                         break;
1578                                 }
1579                         }
1580
1581                         if (!used) {
1582                                 memcpy(perm_addr,
1583                                        local->hw.wiphy->addresses[i].addr,
1584                                        ETH_ALEN);
1585                                 break;
1586                         }
1587                 }
1588
1589                 /* try mask if available */
1590                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1591                         break;
1592
1593                 m = local->hw.wiphy->addr_mask;
1594                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1595                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1596                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1597
1598                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1599                         /* not a contiguous mask ... not handled now! */
1600                         pr_info("not contiguous\n");
1601                         break;
1602                 }
1603
1604                 /*
1605                  * Pick address of existing interface in case user changed
1606                  * MAC address manually, default to perm_addr.
1607                  */
1608                 m = local->hw.wiphy->perm_addr;
1609                 list_for_each_entry(sdata, &local->interfaces, list) {
1610                         if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
1611                                 continue;
1612                         m = sdata->vif.addr;
1613                         break;
1614                 }
1615                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1616                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1617                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1618
1619                 inc = 1ULL<<__ffs64(mask);
1620                 val = (start & mask);
1621                 addr = (start & ~mask) | (val & mask);
1622                 do {
1623                         bool used = false;
1624
1625                         tmp_addr[5] = addr >> 0*8;
1626                         tmp_addr[4] = addr >> 1*8;
1627                         tmp_addr[3] = addr >> 2*8;
1628                         tmp_addr[2] = addr >> 3*8;
1629                         tmp_addr[1] = addr >> 4*8;
1630                         tmp_addr[0] = addr >> 5*8;
1631
1632                         val += inc;
1633
1634                         list_for_each_entry(sdata, &local->interfaces, list) {
1635                                 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) {
1636                                         used = true;
1637                                         break;
1638                                 }
1639                         }
1640
1641                         if (!used) {
1642                                 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1643                                 break;
1644                         }
1645                         addr = (start & ~mask) | (val & mask);
1646                 } while (addr != start);
1647
1648                 break;
1649         }
1650
1651  out_unlock:
1652         mutex_unlock(&local->iflist_mtx);
1653 }
1654
1655 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1656                      struct wireless_dev **new_wdev, enum nl80211_iftype type,
1657                      struct vif_params *params)
1658 {
1659         struct net_device *ndev = NULL;
1660         struct ieee80211_sub_if_data *sdata = NULL;
1661         int ret, i;
1662         int txqs = 1;
1663
1664         ASSERT_RTNL();
1665
1666         if (type == NL80211_IFTYPE_P2P_DEVICE) {
1667                 struct wireless_dev *wdev;
1668
1669                 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1670                                 GFP_KERNEL);
1671                 if (!sdata)
1672                         return -ENOMEM;
1673                 wdev = &sdata->wdev;
1674
1675                 sdata->dev = NULL;
1676                 strlcpy(sdata->name, name, IFNAMSIZ);
1677                 ieee80211_assign_perm_addr(local, wdev->address, type);
1678                 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1679         } else {
1680                 if (local->hw.queues >= IEEE80211_NUM_ACS)
1681                         txqs = IEEE80211_NUM_ACS;
1682
1683                 ndev = alloc_netdev_mqs(sizeof(*sdata) + local->hw.vif_data_size,
1684                                         name, NET_NAME_UNKNOWN,
1685                                         ieee80211_if_setup, txqs, 1);
1686                 if (!ndev)
1687                         return -ENOMEM;
1688                 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1689
1690                 ndev->needed_headroom = local->tx_headroom +
1691                                         4*6 /* four MAC addresses */
1692                                         + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1693                                         + 6 /* mesh */
1694                                         + 8 /* rfc1042/bridge tunnel */
1695                                         - ETH_HLEN /* ethernet hard_header_len */
1696                                         + IEEE80211_ENCRYPT_HEADROOM;
1697                 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1698
1699                 ret = dev_alloc_name(ndev, ndev->name);
1700                 if (ret < 0) {
1701                         free_netdev(ndev);
1702                         return ret;
1703                 }
1704
1705                 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1706                 if (params && is_valid_ether_addr(params->macaddr))
1707                         memcpy(ndev->dev_addr, params->macaddr, ETH_ALEN);
1708                 else
1709                         memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1710                 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1711
1712                 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1713                 sdata = netdev_priv(ndev);
1714                 ndev->ieee80211_ptr = &sdata->wdev;
1715                 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1716                 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1717
1718                 sdata->dev = ndev;
1719         }
1720
1721         /* initialise type-independent data */
1722         sdata->wdev.wiphy = local->hw.wiphy;
1723         sdata->local = local;
1724
1725         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1726                 skb_queue_head_init(&sdata->fragments[i].skb_list);
1727
1728         INIT_LIST_HEAD(&sdata->key_list);
1729
1730         INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
1731                           ieee80211_dfs_cac_timer_work);
1732         INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
1733                           ieee80211_delayed_tailroom_dec);
1734
1735         for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1736                 struct ieee80211_supported_band *sband;
1737                 sband = local->hw.wiphy->bands[i];
1738                 sdata->rc_rateidx_mask[i] =
1739                         sband ? (1 << sband->n_bitrates) - 1 : 0;
1740                 if (sband)
1741                         memcpy(sdata->rc_rateidx_mcs_mask[i],
1742                                sband->ht_cap.mcs.rx_mask,
1743                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1744                 else
1745                         memset(sdata->rc_rateidx_mcs_mask[i], 0,
1746                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1747         }
1748
1749         ieee80211_set_default_queues(sdata);
1750
1751         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1752         sdata->user_power_level = local->user_power_level;
1753
1754         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1755
1756         /* setup type-dependent data */
1757         ieee80211_setup_sdata(sdata, type);
1758
1759         if (ndev) {
1760                 if (params) {
1761                         ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1762                         if (type == NL80211_IFTYPE_STATION)
1763                                 sdata->u.mgd.use_4addr = params->use_4addr;
1764                 }
1765
1766                 ndev->features |= local->hw.netdev_features;
1767
1768                 netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops);
1769
1770                 ret = register_netdevice(ndev);
1771                 if (ret) {
1772                         free_netdev(ndev);
1773                         return ret;
1774                 }
1775         }
1776
1777         mutex_lock(&local->iflist_mtx);
1778         list_add_tail_rcu(&sdata->list, &local->interfaces);
1779         mutex_unlock(&local->iflist_mtx);
1780
1781         if (new_wdev)
1782                 *new_wdev = &sdata->wdev;
1783
1784         return 0;
1785 }
1786
1787 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1788 {
1789         ASSERT_RTNL();
1790
1791         mutex_lock(&sdata->local->iflist_mtx);
1792         list_del_rcu(&sdata->list);
1793         mutex_unlock(&sdata->local->iflist_mtx);
1794
1795         synchronize_rcu();
1796
1797         if (sdata->dev) {
1798                 unregister_netdevice(sdata->dev);
1799         } else {
1800                 cfg80211_unregister_wdev(&sdata->wdev);
1801                 kfree(sdata);
1802         }
1803 }
1804
1805 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
1806 {
1807         if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
1808                 return;
1809         ieee80211_do_stop(sdata, true);
1810         ieee80211_teardown_sdata(sdata);
1811 }
1812
1813 /*
1814  * Remove all interfaces, may only be called at hardware unregistration
1815  * time because it doesn't do RCU-safe list removals.
1816  */
1817 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1818 {
1819         struct ieee80211_sub_if_data *sdata, *tmp;
1820         LIST_HEAD(unreg_list);
1821         LIST_HEAD(wdev_list);
1822
1823         ASSERT_RTNL();
1824
1825         /*
1826          * Close all AP_VLAN interfaces first, as otherwise they
1827          * might be closed while the AP interface they belong to
1828          * is closed, causing unregister_netdevice_many() to crash.
1829          */
1830         list_for_each_entry(sdata, &local->interfaces, list)
1831                 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1832                         dev_close(sdata->dev);
1833
1834         mutex_lock(&local->iflist_mtx);
1835         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1836                 list_del(&sdata->list);
1837
1838                 if (sdata->dev)
1839                         unregister_netdevice_queue(sdata->dev, &unreg_list);
1840                 else
1841                         list_add(&sdata->list, &wdev_list);
1842         }
1843         mutex_unlock(&local->iflist_mtx);
1844         unregister_netdevice_many(&unreg_list);
1845
1846         list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
1847                 list_del(&sdata->list);
1848                 cfg80211_unregister_wdev(&sdata->wdev);
1849                 kfree(sdata);
1850         }
1851 }
1852
1853 static int netdev_notify(struct notifier_block *nb,
1854                          unsigned long state, void *ptr)
1855 {
1856         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1857         struct ieee80211_sub_if_data *sdata;
1858
1859         if (state != NETDEV_CHANGENAME)
1860                 return NOTIFY_DONE;
1861
1862         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1863                 return NOTIFY_DONE;
1864
1865         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1866                 return NOTIFY_DONE;
1867
1868         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1869         memcpy(sdata->name, dev->name, IFNAMSIZ);
1870         ieee80211_debugfs_rename_netdev(sdata);
1871
1872         return NOTIFY_OK;
1873 }
1874
1875 static struct notifier_block mac80211_netdev_notifier = {
1876         .notifier_call = netdev_notify,
1877 };
1878
1879 int ieee80211_iface_init(void)
1880 {
1881         return register_netdevice_notifier(&mac80211_netdev_notifier);
1882 }
1883
1884 void ieee80211_iface_exit(void)
1885 {
1886         unregister_netdevice_notifier(&mac80211_netdev_notifier);
1887 }