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 <[email protected]>
   7  * Copyright 2008, Johannes Berg <[email protected]>
   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                               bool update_bss)
  78 {
  79         if (__ieee80211_recalc_txpower(sdata) || update_bss)
  80                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_TXPOWER);
  81 }
  82
  83 static u32 __ieee80211_idle_off(struct ieee80211_local *local)
  84 {
  85         if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
  86                 return 0;
  87
  88         local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
  89         return IEEE80211_CONF_CHANGE_IDLE;
  90 }
  91
  92 static u32 __ieee80211_idle_on(struct ieee80211_local *local)
  93 {
  94         if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
  95                 return 0;
  96
  97         ieee80211_flush_queues(local, NULL, false);
  98
  99         local->hw.conf.flags |= IEEE80211_CONF_IDLE;
 100         return IEEE80211_CONF_CHANGE_IDLE;
 101 }
 102
 103 static u32 __ieee80211_recalc_idle(struct ieee80211_local *local,
 104                                    bool force_active)
 105 {
 106         bool working, scanning, active;
 107         unsigned int led_trig_start = 0, led_trig_stop = 0;
 108
 109         lockdep_assert_held(&local->mtx);
 110
 111         active = force_active ||
 112                  !list_empty(&local->chanctx_list) ||
 113                  local->monitors;
 114
 115         working = !local->ops->remain_on_channel &&
 116                   !list_empty(&local->roc_list);
 117
 118         scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) ||
 119                    test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning);
 120
 121         if (working || scanning)
 122                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
 123         else
 124                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
 125
 126         if (active)
 127                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
 128         else
 129                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
 130
 131         ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
 132
 133         if (working || scanning || active)
 134                 return __ieee80211_idle_off(local);
 135         return __ieee80211_idle_on(local);
 136 }
 137
 138 u32 ieee80211_idle_off(struct ieee80211_local *local)
 139 {
 140         return __ieee80211_recalc_idle(local, true);
 141 }
 142
 143 void ieee80211_recalc_idle(struct ieee80211_local *local)
 144 {
 145         u32 change = __ieee80211_recalc_idle(local, false);
 146         if (change)
 147                 ieee80211_hw_config(local, change);
 148 }
 149
 150 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
 151 {
 152         if (new_mtu < 256 || new_mtu > IEEE80211_MAX_DATA_LEN)
 153                 return -EINVAL;
 154
 155         dev->mtu = new_mtu;
 156         return 0;
 157 }
 158
 159 static int ieee80211_verify_mac(struct ieee80211_sub_if_data *sdata, u8 *addr,
 160                                 bool check_dup)
 161 {
 162         struct ieee80211_local *local = sdata->local;
 163         struct ieee80211_sub_if_data *iter;
 164         u64 new, mask, tmp;
 165         u8 *m;
 166         int ret = 0;
 167
 168         if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
 169                 return 0;
 170
 171         m = addr;
 172         new =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 173                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 174                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 175
 176         m = local->hw.wiphy->addr_mask;
 177         mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 178                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 179                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 180
 181         if (!check_dup)
 182                 return ret;
 183
 184         mutex_lock(&local->iflist_mtx);
 185         list_for_each_entry(iter, &local->interfaces, list) {
 186                 if (iter == sdata)
 187                         continue;
 188
 189                 if (iter->vif.type == NL80211_IFTYPE_MONITOR &&
 190                     !(iter->u.mntr_flags & MONITOR_FLAG_ACTIVE))
 191                         continue;
 192
 193                 m = iter->vif.addr;
 194                 tmp =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 195                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 196                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 197
 198                 if ((new & ~mask) != (tmp & ~mask)) {
 199                         ret = -EINVAL;
 200                         break;
 201                 }
 202         }
 203         mutex_unlock(&local->iflist_mtx);
 204
 205         return ret;
 206 }
 207
 208 static int ieee80211_change_mac(struct net_device *dev, void *addr)
 209 {
 210         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 211         struct sockaddr *sa = addr;
 212         bool check_dup = true;
 213         int ret;
 214
 215         if (ieee80211_sdata_running(sdata))
 216                 return -EBUSY;
 217
 218         if (sdata->vif.type == NL80211_IFTYPE_MONITOR &&
 219             !(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE))
 220                 check_dup = false;
 221
 222         ret = ieee80211_verify_mac(sdata, sa->sa_data, check_dup);
 223         if (ret)
 224                 return ret;
 225
 226         ret = eth_mac_addr(dev, sa);
 227
 228         if (ret == 0)
 229                 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
 230
 231         return ret;
 232 }
 233
 234 static inline int identical_mac_addr_allowed(int type1, int type2)
 235 {
 236         return type1 == NL80211_IFTYPE_MONITOR ||
 237                 type2 == NL80211_IFTYPE_MONITOR ||
 238                 type1 == NL80211_IFTYPE_P2P_DEVICE ||
 239                 type2 == NL80211_IFTYPE_P2P_DEVICE ||
 240                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
 241                 (type1 == NL80211_IFTYPE_WDS &&
 242                         (type2 == NL80211_IFTYPE_WDS ||
 243                          type2 == NL80211_IFTYPE_AP)) ||
 244                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
 245                 (type1 == NL80211_IFTYPE_AP_VLAN &&
 246                         (type2 == NL80211_IFTYPE_AP ||
 247                          type2 == NL80211_IFTYPE_AP_VLAN));
 248 }
 249
 250 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
 251                                             enum nl80211_iftype iftype)
 252 {
 253         struct ieee80211_local *local = sdata->local;
 254         struct ieee80211_sub_if_data *nsdata;
 255         int ret;
 256
 257         ASSERT_RTNL();
 258
 259         /* we hold the RTNL here so can safely walk the list */
 260         list_for_each_entry(nsdata, &local->interfaces, list) {
 261                 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
 262                         /*
 263                          * Only OCB and monitor mode may coexist
 264                          */
 265                         if ((sdata->vif.type == NL80211_IFTYPE_OCB &&
 266                              nsdata->vif.type != NL80211_IFTYPE_MONITOR) ||
 267                             (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
 268                              nsdata->vif.type == NL80211_IFTYPE_OCB))
 269                                 return -EBUSY;
 270
 271                         /*
 272                          * Allow only a single IBSS interface to be up at any
 273                          * time. This is restricted because beacon distribution
 274                          * cannot work properly if both are in the same IBSS.
 275                          *
 276                          * To remove this restriction we'd have to disallow them
 277                          * from setting the same SSID on different IBSS interfaces
 278                          * belonging to the same hardware. Then, however, we're
 279                          * faced with having to adopt two different TSF timers...
 280                          */
 281                         if (iftype == NL80211_IFTYPE_ADHOC &&
 282                             nsdata->vif.type == NL80211_IFTYPE_ADHOC)
 283                                 return -EBUSY;
 284                         /*
 285                          * will not add another interface while any channel
 286                          * switch is active.
 287                          */
 288                         if (nsdata->vif.csa_active)
 289                                 return -EBUSY;
 290
 291                         /*
 292                          * The remaining checks are only performed for interfaces
 293                          * with the same MAC address.
 294                          */
 295                         if (!ether_addr_equal(sdata->vif.addr,
 296                                               nsdata->vif.addr))
 297                                 continue;
 298
 299                         /*
 300                          * check whether it may have the same address
 301                          */
 302                         if (!identical_mac_addr_allowed(iftype,
 303                                                         nsdata->vif.type))
 304                                 return -ENOTUNIQ;
 305
 306                         /*
 307                          * can only add VLANs to enabled APs
 308                          */
 309                         if (iftype == NL80211_IFTYPE_AP_VLAN &&
 310                             nsdata->vif.type == NL80211_IFTYPE_AP)
 311                                 sdata->bss = &nsdata->u.ap;
 312                 }
 313         }
 314
 315         mutex_lock(&local->chanctx_mtx);
 316         ret = ieee80211_check_combinations(sdata, NULL, 0, 0);
 317         mutex_unlock(&local->chanctx_mtx);
 318         return ret;
 319 }
 320
 321 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata,
 322                                   enum nl80211_iftype iftype)
 323 {
 324         int n_queues = sdata->local->hw.queues;
 325         int i;
 326
 327         if (iftype != NL80211_IFTYPE_P2P_DEVICE) {
 328                 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 329                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
 330                                          IEEE80211_INVAL_HW_QUEUE))
 331                                 return -EINVAL;
 332                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
 333                                          n_queues))
 334                                 return -EINVAL;
 335                 }
 336         }
 337
 338         if ((iftype != NL80211_IFTYPE_AP &&
 339              iftype != NL80211_IFTYPE_P2P_GO &&
 340              iftype != NL80211_IFTYPE_MESH_POINT) ||
 341             !(sdata->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)) {
 342                 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
 343                 return 0;
 344         }
 345
 346         if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
 347                 return -EINVAL;
 348
 349         if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
 350                 return -EINVAL;
 351
 352         return 0;
 353 }
 354
 355 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
 356                                     const int offset)
 357 {
 358         struct ieee80211_local *local = sdata->local;
 359         u32 flags = sdata->u.mntr_flags;
 360
 361 #define ADJUST(_f, _s)  do {                                    \
 362         if (flags & MONITOR_FLAG_##_f)                          \
 363                 local->fif_##_s += offset;                      \
 364         } while (0)
 365
 366         ADJUST(FCSFAIL, fcsfail);
 367         ADJUST(PLCPFAIL, plcpfail);
 368         ADJUST(CONTROL, control);
 369         ADJUST(CONTROL, pspoll);
 370         ADJUST(OTHER_BSS, other_bss);
 371
 372 #undef ADJUST
 373 }
 374
 375 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
 376 {
 377         struct ieee80211_local *local = sdata->local;
 378         int i;
 379
 380         for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 381                 if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
 382                         sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
 383                 else if (local->hw.queues >= IEEE80211_NUM_ACS)
 384                         sdata->vif.hw_queue[i] = i;
 385                 else
 386                         sdata->vif.hw_queue[i] = 0;
 387         }
 388         sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
 389 }
 390
 391 int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
 392 {
 393         struct ieee80211_sub_if_data *sdata;
 394         int ret;
 395
 396         if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
 397                 return 0;
 398
 399         ASSERT_RTNL();
 400
 401         if (local->monitor_sdata)
 402                 return 0;
 403
 404         sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
 405         if (!sdata)
 406                 return -ENOMEM;
 407
 408         /* set up data */
 409         sdata->local = local;
 410         sdata->vif.type = NL80211_IFTYPE_MONITOR;
 411         snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
 412                  wiphy_name(local->hw.wiphy));
 413         sdata->wdev.iftype = NL80211_IFTYPE_MONITOR;
 414
 415         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
 416
 417         ieee80211_set_default_queues(sdata);
 418
 419         ret = drv_add_interface(local, sdata);
 420         if (WARN_ON(ret)) {
 421                 /* ok .. stupid driver, it asked for this! */
 422                 kfree(sdata);
 423                 return ret;
 424         }
 425
 426         ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR);
 427         if (ret) {
 428                 kfree(sdata);
 429                 return ret;
 430         }
 431
 432         mutex_lock(&local->iflist_mtx);
 433         rcu_assign_pointer(local->monitor_sdata, sdata);
 434         mutex_unlock(&local->iflist_mtx);
 435
 436         mutex_lock(&local->mtx);
 437         ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef,
 438                                         IEEE80211_CHANCTX_EXCLUSIVE);
 439         mutex_unlock(&local->mtx);
 440         if (ret) {
 441                 mutex_lock(&local->iflist_mtx);
 442                 RCU_INIT_POINTER(local->monitor_sdata, NULL);
 443                 mutex_unlock(&local->iflist_mtx);
 444                 synchronize_net();
 445                 drv_remove_interface(local, sdata);
 446                 kfree(sdata);
 447                 return ret;
 448         }
 449
 450         return 0;
 451 }
 452
 453 void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
 454 {
 455         struct ieee80211_sub_if_data *sdata;
 456
 457         if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
 458                 return;
 459
 460         ASSERT_RTNL();
 461
 462         mutex_lock(&local->iflist_mtx);
 463
 464         sdata = rcu_dereference_protected(local->monitor_sdata,
 465                                           lockdep_is_held(&local->iflist_mtx));
 466         if (!sdata) {
 467                 mutex_unlock(&local->iflist_mtx);
 468                 return;
 469         }
 470
 471         RCU_INIT_POINTER(local->monitor_sdata, NULL);
 472         mutex_unlock(&local->iflist_mtx);
 473
 474         synchronize_net();
 475
 476         mutex_lock(&local->mtx);
 477         ieee80211_vif_release_channel(sdata);
 478         mutex_unlock(&local->mtx);
 479
 480         drv_remove_interface(local, sdata);
 481
 482         kfree(sdata);
 483 }
 484
 485 /*
 486  * NOTE: Be very careful when changing this function, it must NOT return
 487  * an error on interface type changes that have been pre-checked, so most
 488  * checks should be in ieee80211_check_concurrent_iface.
 489  */
 490 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
 491 {
 492         struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
 493         struct net_device *dev = wdev->netdev;
 494         struct ieee80211_local *local = sdata->local;
 495         struct sta_info *sta;
 496         u32 changed = 0;
 497         int res;
 498         u32 hw_reconf_flags = 0;
 499
 500         switch (sdata->vif.type) {
 501         case NL80211_IFTYPE_WDS:
 502                 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
 503                         return -ENOLINK;
 504                 break;
 505         case NL80211_IFTYPE_AP_VLAN: {
 506                 struct ieee80211_sub_if_data *master;
 507
 508                 if (!sdata->bss)
 509                         return -ENOLINK;
 510
 511                 mutex_lock(&local->mtx);
 512                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
 513                 mutex_unlock(&local->mtx);
 514
 515                 master = container_of(sdata->bss,
 516                                       struct ieee80211_sub_if_data, u.ap);
 517                 sdata->control_port_protocol =
 518                         master->control_port_protocol;
 519                 sdata->control_port_no_encrypt =
 520                         master->control_port_no_encrypt;
 521                 sdata->vif.cab_queue = master->vif.cab_queue;
 522                 memcpy(sdata->vif.hw_queue, master->vif.hw_queue,
 523                        sizeof(sdata->vif.hw_queue));
 524                 sdata->vif.bss_conf.chandef = master->vif.bss_conf.chandef;
 525
 526                 mutex_lock(&local->key_mtx);
 527                 sdata->crypto_tx_tailroom_needed_cnt +=
 528                         master->crypto_tx_tailroom_needed_cnt;
 529                 mutex_unlock(&local->key_mtx);
 530
 531                 break;
 532                 }
 533         case NL80211_IFTYPE_AP:
 534                 sdata->bss = &sdata->u.ap;
 535                 break;
 536         case NL80211_IFTYPE_MESH_POINT:
 537         case NL80211_IFTYPE_STATION:
 538         case NL80211_IFTYPE_MONITOR:
 539         case NL80211_IFTYPE_ADHOC:
 540         case NL80211_IFTYPE_P2P_DEVICE:
 541         case NL80211_IFTYPE_OCB:
 542                 /* no special treatment */
 543                 break;
 544         case NL80211_IFTYPE_UNSPECIFIED:
 545         case NUM_NL80211_IFTYPES:
 546         case NL80211_IFTYPE_P2P_CLIENT:
 547         case NL80211_IFTYPE_P2P_GO:
 548                 /* cannot happen */
 549                 WARN_ON(1);
 550                 break;
 551         }
 552
 553         if (local->open_count == 0) {
 554                 res = drv_start(local);
 555                 if (res)
 556                         goto err_del_bss;
 557                 /* we're brought up, everything changes */
 558                 hw_reconf_flags = ~0;
 559                 ieee80211_led_radio(local, true);
 560                 ieee80211_mod_tpt_led_trig(local,
 561                                            IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
 562         }
 563
 564         /*
 565          * Copy the hopefully now-present MAC address to
 566          * this interface, if it has the special null one.
 567          */
 568         if (dev && is_zero_ether_addr(dev->dev_addr)) {
 569                 memcpy(dev->dev_addr,
 570                        local->hw.wiphy->perm_addr,
 571                        ETH_ALEN);
 572                 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
 573
 574                 if (!is_valid_ether_addr(dev->dev_addr)) {
 575                         res = -EADDRNOTAVAIL;
 576                         goto err_stop;
 577                 }
 578         }
 579
 580         switch (sdata->vif.type) {
 581         case NL80211_IFTYPE_AP_VLAN:
 582                 /* no need to tell driver, but set carrier and chanctx */
 583                 if (rtnl_dereference(sdata->bss->beacon)) {
 584                         ieee80211_vif_vlan_copy_chanctx(sdata);
 585                         netif_carrier_on(dev);
 586                 } else {
 587                         netif_carrier_off(dev);
 588                 }
 589                 break;
 590         case NL80211_IFTYPE_MONITOR:
 591                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 592                         local->cooked_mntrs++;
 593                         break;
 594                 }
 595
 596                 if (sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE) {
 597                         res = drv_add_interface(local, sdata);
 598                         if (res)
 599                                 goto err_stop;
 600                 } else if (local->monitors == 0 && local->open_count == 0) {
 601                         res = ieee80211_add_virtual_monitor(local);
 602                         if (res)
 603                                 goto err_stop;
 604                 }
 605
 606                 /* must be before the call to ieee80211_configure_filter */
 607                 local->monitors++;
 608                 if (local->monitors == 1) {
 609                         local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
 610                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 611                 }
 612
 613                 ieee80211_adjust_monitor_flags(sdata, 1);
 614                 ieee80211_configure_filter(local);
 615                 mutex_lock(&local->mtx);
 616                 ieee80211_recalc_idle(local);
 617                 mutex_unlock(&local->mtx);
 618
 619                 netif_carrier_on(dev);
 620                 break;
 621         default:
 622                 if (coming_up) {
 623                         ieee80211_del_virtual_monitor(local);
 624
 625                         res = drv_add_interface(local, sdata);
 626                         if (res)
 627                                 goto err_stop;
 628                         res = ieee80211_check_queues(sdata,
 629                                 ieee80211_vif_type_p2p(&sdata->vif));
 630                         if (res)
 631                                 goto err_del_interface;
 632                 }
 633
 634                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
 635                         local->fif_pspoll++;
 636                         local->fif_probe_req++;
 637
 638                         ieee80211_configure_filter(local);
 639                 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 640                         local->fif_probe_req++;
 641                 }
 642
 643                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
 644                         changed |= ieee80211_reset_erp_info(sdata);
 645                 ieee80211_bss_info_change_notify(sdata, changed);
 646
 647                 switch (sdata->vif.type) {
 648                 case NL80211_IFTYPE_STATION:
 649                 case NL80211_IFTYPE_ADHOC:
 650                 case NL80211_IFTYPE_AP:
 651                 case NL80211_IFTYPE_MESH_POINT:
 652                 case NL80211_IFTYPE_OCB:
 653                         netif_carrier_off(dev);
 654                         break;
 655                 case NL80211_IFTYPE_WDS:
 656                 case NL80211_IFTYPE_P2P_DEVICE:
 657                         break;
 658                 default:
 659                         /* not reached */
 660                         WARN_ON(1);
 661                 }
 662
 663                 /*
 664                  * set default queue parameters so drivers don't
 665                  * need to initialise the hardware if the hardware
 666                  * doesn't start up with sane defaults
 667                  */
 668                 ieee80211_set_wmm_default(sdata, true);
 669         }
 670
 671         set_bit(SDATA_STATE_RUNNING, &sdata->state);
 672
 673         if (sdata->vif.type == NL80211_IFTYPE_WDS) {
 674                 /* Create STA entry for the WDS peer */
 675                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
 676                                      GFP_KERNEL);
 677                 if (!sta) {
 678                         res = -ENOMEM;
 679                         goto err_del_interface;
 680                 }
 681
 682                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
 683                 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
 684                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
 685
 686                 res = sta_info_insert(sta);
 687                 if (res) {
 688                         /* STA has been freed */
 689                         goto err_del_interface;
 690                 }
 691
 692                 rate_control_rate_init(sta);
 693                 netif_carrier_on(dev);
 694         } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
 695                 rcu_assign_pointer(local->p2p_sdata, sdata);
 696         }
 697
 698         /*
 699          * set_multicast_list will be invoked by the networking core
 700          * which will check whether any increments here were done in
 701          * error and sync them down to the hardware as filter flags.
 702          */
 703         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 704                 atomic_inc(&local->iff_allmultis);
 705
 706         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 707                 atomic_inc(&local->iff_promiscs);
 708
 709         if (coming_up)
 710                 local->open_count++;
 711
 712         if (hw_reconf_flags)
 713                 ieee80211_hw_config(local, hw_reconf_flags);
 714
 715         ieee80211_recalc_ps(local, -1);
 716
 717         if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
 718             sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 719                 /* XXX: for AP_VLAN, actually track AP queues */
 720                 netif_tx_start_all_queues(dev);
 721         } else if (dev) {
 722                 unsigned long flags;
 723                 int n_acs = IEEE80211_NUM_ACS;
 724                 int ac;
 725
 726                 if (local->hw.queues < IEEE80211_NUM_ACS)
 727                         n_acs = 1;
 728
 729                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 730                 if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE ||
 731                     (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 &&
 732                      skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) {
 733                         for (ac = 0; ac < n_acs; ac++) {
 734                                 int ac_queue = sdata->vif.hw_queue[ac];
 735
 736                                 if (local->queue_stop_reasons[ac_queue] == 0 &&
 737                                     skb_queue_empty(&local->pending[ac_queue]))
 738                                         netif_start_subqueue(dev, ac);
 739                         }
 740                 }
 741                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 742         }
 743
 744         return 0;
 745  err_del_interface:
 746         drv_remove_interface(local, sdata);
 747  err_stop:
 748         if (!local->open_count)
 749                 drv_stop(local);
 750  err_del_bss:
 751         sdata->bss = NULL;
 752         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 753                 mutex_lock(&local->mtx);
 754                 list_del(&sdata->u.vlan.list);
 755                 mutex_unlock(&local->mtx);
 756         }
 757         /* might already be clear but that doesn't matter */
 758         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 759         return res;
 760 }
 761
 762 static int ieee80211_open(struct net_device *dev)
 763 {
 764         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 765         int err;
 766
 767         /* fail early if user set an invalid address */
 768         if (!is_valid_ether_addr(dev->dev_addr))
 769                 return -EADDRNOTAVAIL;
 770
 771         err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
 772         if (err)
 773                 return err;
 774
 775         return ieee80211_do_open(&sdata->wdev, true);
 776 }
 777
 778 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
 779                               bool going_down)
 780 {
 781         struct ieee80211_local *local = sdata->local;
 782         unsigned long flags;
 783         struct sk_buff *skb, *tmp;
 784         u32 hw_reconf_flags = 0;
 785         int i, flushed;
 786         struct ps_data *ps;
 787         struct cfg80211_chan_def chandef;
 788         bool cancel_scan;
 789
 790         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 791
 792         cancel_scan = rcu_access_pointer(local->scan_sdata) == sdata;
 793         if (cancel_scan)
 794                 ieee80211_scan_cancel(local);
 795
 796         /*
 797          * Stop TX on this interface first.
 798          */
 799         if (sdata->dev)
 800                 netif_tx_stop_all_queues(sdata->dev);
 801
 802         ieee80211_roc_purge(local, sdata);
 803
 804         switch (sdata->vif.type) {
 805         case NL80211_IFTYPE_STATION:
 806                 ieee80211_mgd_stop(sdata);
 807                 break;
 808         case NL80211_IFTYPE_ADHOC:
 809                 ieee80211_ibss_stop(sdata);
 810                 break;
 811         case NL80211_IFTYPE_AP:
 812                 cancel_work_sync(&sdata->u.ap.request_smps_work);
 813                 break;
 814         default:
 815                 break;
 816         }
 817
 818         /*
 819          * Remove all stations associated with this interface.
 820          *
 821          * This must be done before calling ops->remove_interface()
 822          * because otherwise we can later invoke ops->sta_notify()
 823          * whenever the STAs are removed, and that invalidates driver
 824          * assumptions about always getting a vif pointer that is valid
 825          * (because if we remove a STA after ops->remove_interface()
 826          * the driver will have removed the vif info already!)
 827          *
 828          * In WDS mode a station must exist here and be flushed, for
 829          * AP_VLANs stations may exist since there's nothing else that
 830          * would have removed them, but in other modes there shouldn't
 831          * be any stations.
 832          */
 833         flushed = sta_info_flush(sdata);
 834         WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
 835                      ((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) ||
 836                       (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1)));
 837
 838         /* don't count this interface for promisc/allmulti while it is down */
 839         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 840                 atomic_dec(&local->iff_allmultis);
 841
 842         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 843                 atomic_dec(&local->iff_promiscs);
 844
 845         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 846                 local->fif_pspoll--;
 847                 local->fif_probe_req--;
 848         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 849                 local->fif_probe_req--;
 850         }
 851
 852         if (sdata->dev) {
 853                 netif_addr_lock_bh(sdata->dev);
 854                 spin_lock_bh(&local->filter_lock);
 855                 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
 856                                  sdata->dev->addr_len);
 857                 spin_unlock_bh(&local->filter_lock);
 858                 netif_addr_unlock_bh(sdata->dev);
 859         }
 860
 861         del_timer_sync(&local->dynamic_ps_timer);
 862         cancel_work_sync(&local->dynamic_ps_enable_work);
 863
 864         cancel_work_sync(&sdata->recalc_smps);
 865         sdata_lock(sdata);
 866         mutex_lock(&local->mtx);
 867         sdata->vif.csa_active = false;
 868         if (sdata->vif.type == NL80211_IFTYPE_STATION)
 869                 sdata->u.mgd.csa_waiting_bcn = false;
 870         if (sdata->csa_block_tx) {
 871                 ieee80211_wake_vif_queues(local, sdata,
 872                                           IEEE80211_QUEUE_STOP_REASON_CSA);
 873                 sdata->csa_block_tx = false;
 874         }
 875         mutex_unlock(&local->mtx);
 876         sdata_unlock(sdata);
 877
 878         cancel_work_sync(&sdata->csa_finalize_work);
 879
 880         cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
 881
 882         if (sdata->wdev.cac_started) {
 883                 chandef = sdata->vif.bss_conf.chandef;
 884                 WARN_ON(local->suspended);
 885                 mutex_lock(&local->mtx);
 886                 ieee80211_vif_release_channel(sdata);
 887                 mutex_unlock(&local->mtx);
 888                 cfg80211_cac_event(sdata->dev, &chandef,
 889                                    NL80211_RADAR_CAC_ABORTED,
 890                                    GFP_KERNEL);
 891         }
 892
 893         /* APs need special treatment */
 894         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 895                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
 896
 897                 /* down all dependent devices, that is VLANs */
 898                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
 899                                          u.vlan.list)
 900                         dev_close(vlan->dev);
 901                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
 902         } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 903                 /* remove all packets in parent bc_buf pointing to this dev */
 904                 ps = &sdata->bss->ps;
 905
 906                 spin_lock_irqsave(&ps->bc_buf.lock, flags);
 907                 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
 908                         if (skb->dev == sdata->dev) {
 909                                 __skb_unlink(skb, &ps->bc_buf);
 910                                 local->total_ps_buffered--;
 911                                 ieee80211_free_txskb(&local->hw, skb);
 912                         }
 913                 }
 914                 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
 915         }
 916
 917         if (going_down)
 918                 local->open_count--;
 919
 920         switch (sdata->vif.type) {
 921         case NL80211_IFTYPE_AP_VLAN:
 922                 mutex_lock(&local->mtx);
 923                 list_del(&sdata->u.vlan.list);
 924                 mutex_unlock(&local->mtx);
 925                 RCU_INIT_POINTER(sdata->vif.chanctx_conf, NULL);
 926                 /* see comment in the default case below */
 927                 ieee80211_free_keys(sdata, true);
 928                 /* no need to tell driver */
 929                 break;
 930         case NL80211_IFTYPE_MONITOR:
 931                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 932                         local->cooked_mntrs--;
 933                         break;
 934                 }
 935
 936                 local->monitors--;
 937                 if (local->monitors == 0) {
 938                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
 939                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 940                 }
 941
 942                 ieee80211_adjust_monitor_flags(sdata, -1);
 943                 break;
 944         case NL80211_IFTYPE_P2P_DEVICE:
 945                 /* relies on synchronize_rcu() below */
 946                 RCU_INIT_POINTER(local->p2p_sdata, NULL);
 947                 /* fall through */
 948         default:
 949                 cancel_work_sync(&sdata->work);
 950                 /*
 951                  * When we get here, the interface is marked down.
 952                  * Free the remaining keys, if there are any
 953                  * (which can happen in AP mode if userspace sets
 954                  * keys before the interface is operating, and maybe
 955                  * also in WDS mode)
 956                  *
 957                  * Force the key freeing to always synchronize_net()
 958                  * to wait for the RX path in case it is using this
 959                  * interface enqueuing frames at this very time on
 960                  * another CPU.
 961                  */
 962                 ieee80211_free_keys(sdata, true);
 963                 skb_queue_purge(&sdata->skb_queue);
 964         }
 965
 966         sdata->bss = NULL;
 967
 968         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 969         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 970                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
 971                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 972                         if (info->control.vif == &sdata->vif) {
 973                                 __skb_unlink(skb, &local->pending[i]);
 974                                 ieee80211_free_txskb(&local->hw, skb);
 975                         }
 976                 }
 977         }
 978         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 979
 980         if (sdata->vif.txq) {
 981                 struct txq_info *txqi = to_txq_info(sdata->vif.txq);
 982
 983                 ieee80211_purge_tx_queue(&local->hw, &txqi->queue);
 984                 atomic_set(&sdata->txqs_len[txqi->txq.ac], 0);
 985         }
 986
 987         if (local->open_count == 0)
 988                 ieee80211_clear_tx_pending(local);
 989
 990         /*
 991          * If the interface goes down while suspended, presumably because
 992          * the device was unplugged and that happens before our resume,
 993          * then the driver is already unconfigured and the remainder of
 994          * this function isn't needed.
 995          * XXX: what about WoWLAN? If the device has software state, e.g.
 996          *      memory allocated, it might expect teardown commands from
 997          *      mac80211 here?
 998          */
 999         if (local->suspended) {
1000                 WARN_ON(local->wowlan);
1001                 WARN_ON(rtnl_dereference(local->monitor_sdata));
1002                 return;
1003         }
1004
1005         switch (sdata->vif.type) {
1006         case NL80211_IFTYPE_AP_VLAN:
1007                 break;
1008         case NL80211_IFTYPE_MONITOR:
1009                 if (local->monitors == 0)
1010                         ieee80211_del_virtual_monitor(local);
1011
1012                 mutex_lock(&local->mtx);
1013                 ieee80211_recalc_idle(local);
1014                 mutex_unlock(&local->mtx);
1015
1016                 if (!(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE))
1017                         break;
1018
1019                 /* fall through */
1020         default:
1021                 if (going_down)
1022                         drv_remove_interface(local, sdata);
1023         }
1024
1025         ieee80211_recalc_ps(local, -1);
1026
1027         if (cancel_scan)
1028                 flush_delayed_work(&local->scan_work);
1029
1030         if (local->open_count == 0) {
1031                 ieee80211_stop_device(local);
1032
1033                 /* no reconfiguring after stop! */
1034                 return;
1035         }
1036
1037         /* do after stop to avoid reconfiguring when we stop anyway */
1038         ieee80211_configure_filter(local);
1039         ieee80211_hw_config(local, hw_reconf_flags);
1040
1041         if (local->monitors == local->open_count)
1042                 ieee80211_add_virtual_monitor(local);
1043 }
1044
1045 static int ieee80211_stop(struct net_device *dev)
1046 {
1047         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1048
1049         ieee80211_do_stop(sdata, true);
1050
1051         return 0;
1052 }
1053
1054 static void ieee80211_set_multicast_list(struct net_device *dev)
1055 {
1056         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1057         struct ieee80211_local *local = sdata->local;
1058         int allmulti, promisc, sdata_allmulti, sdata_promisc;
1059
1060         allmulti = !!(dev->flags & IFF_ALLMULTI);
1061         promisc = !!(dev->flags & IFF_PROMISC);
1062         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
1063         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
1064
1065         if (allmulti != sdata_allmulti) {
1066                 if (dev->flags & IFF_ALLMULTI)
1067                         atomic_inc(&local->iff_allmultis);
1068                 else
1069                         atomic_dec(&local->iff_allmultis);
1070                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
1071         }
1072
1073         if (promisc != sdata_promisc) {
1074                 if (dev->flags & IFF_PROMISC)
1075                         atomic_inc(&local->iff_promiscs);
1076                 else
1077                         atomic_dec(&local->iff_promiscs);
1078                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
1079         }
1080         spin_lock_bh(&local->filter_lock);
1081         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
1082         spin_unlock_bh(&local->filter_lock);
1083         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
1084 }
1085
1086 /*
1087  * Called when the netdev is removed or, by the code below, before
1088  * the interface type changes.
1089  */
1090 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
1091 {
1092         int i;
1093
1094         /* free extra data */
1095         ieee80211_free_keys(sdata, false);
1096
1097         ieee80211_debugfs_remove_netdev(sdata);
1098
1099         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1100                 __skb_queue_purge(&sdata->fragments[i].skb_list);
1101         sdata->fragment_next = 0;
1102
1103         if (ieee80211_vif_is_mesh(&sdata->vif))
1104                 mesh_rmc_free(sdata);
1105 }
1106
1107 static void ieee80211_uninit(struct net_device *dev)
1108 {
1109         ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
1110 }
1111
1112 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
1113                                          struct sk_buff *skb,
1114                                          void *accel_priv,
1115                                          select_queue_fallback_t fallback)
1116 {
1117         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
1118 }
1119
1120 static const struct net_device_ops ieee80211_dataif_ops = {
1121         .ndo_open               = ieee80211_open,
1122         .ndo_stop               = ieee80211_stop,
1123         .ndo_uninit             = ieee80211_uninit,
1124         .ndo_start_xmit         = ieee80211_subif_start_xmit,
1125         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1126         .ndo_change_mtu         = ieee80211_change_mtu,
1127         .ndo_set_mac_address    = ieee80211_change_mac,
1128         .ndo_select_queue       = ieee80211_netdev_select_queue,
1129 };
1130
1131 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
1132                                           struct sk_buff *skb,
1133                                           void *accel_priv,
1134                                           select_queue_fallback_t fallback)
1135 {
1136         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1137         struct ieee80211_local *local = sdata->local;
1138         struct ieee80211_hdr *hdr;
1139         struct ieee80211_radiotap_header *rtap = (void *)skb->data;
1140
1141         if (local->hw.queues < IEEE80211_NUM_ACS)
1142                 return 0;
1143
1144         if (skb->len < 4 ||
1145             skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
1146                 return 0; /* doesn't matter, frame will be dropped */
1147
1148         hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
1149
1150         return ieee80211_select_queue_80211(sdata, skb, hdr);
1151 }
1152
1153 static const struct net_device_ops ieee80211_monitorif_ops = {
1154         .ndo_open               = ieee80211_open,
1155         .ndo_stop               = ieee80211_stop,
1156         .ndo_uninit             = ieee80211_uninit,
1157         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
1158         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1159         .ndo_change_mtu         = ieee80211_change_mtu,
1160         .ndo_set_mac_address    = ieee80211_change_mac,
1161         .ndo_select_queue       = ieee80211_monitor_select_queue,
1162 };
1163
1164 static void ieee80211_if_setup(struct net_device *dev)
1165 {
1166         ether_setup(dev);
1167         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1168         dev->netdev_ops = &ieee80211_dataif_ops;
1169         dev->destructor = free_netdev;
1170 }
1171
1172 static void ieee80211_iface_work(struct work_struct *work)
1173 {
1174         struct ieee80211_sub_if_data *sdata =
1175                 container_of(work, struct ieee80211_sub_if_data, work);
1176         struct ieee80211_local *local = sdata->local;
1177         struct sk_buff *skb;
1178         struct sta_info *sta;
1179         struct ieee80211_ra_tid *ra_tid;
1180         struct ieee80211_rx_agg *rx_agg;
1181
1182         if (!ieee80211_sdata_running(sdata))
1183                 return;
1184
1185         if (local->scanning)
1186                 return;
1187
1188         if (!ieee80211_can_run_worker(local))
1189                 return;
1190
1191         /* first process frames */
1192         while ((skb = skb_dequeue(&sdata->skb_queue))) {
1193                 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1194
1195                 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
1196                         ra_tid = (void *)&skb->cb;
1197                         ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
1198                                                  ra_tid->tid);
1199                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
1200                         ra_tid = (void *)&skb->cb;
1201                         ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
1202                                                 ra_tid->tid);
1203                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_RX_AGG_START) {
1204                         rx_agg = (void *)&skb->cb;
1205                         mutex_lock(&local->sta_mtx);
1206                         sta = sta_info_get_bss(sdata, rx_agg->addr);
1207                         if (sta)
1208                                 __ieee80211_start_rx_ba_session(sta,
1209                                                 0, 0, 0, 1, rx_agg->tid,
1210                                                 IEEE80211_MAX_AMPDU_BUF,
1211                                                 false, true);
1212                         mutex_unlock(&local->sta_mtx);
1213                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_RX_AGG_STOP) {
1214                         rx_agg = (void *)&skb->cb;
1215                         mutex_lock(&local->sta_mtx);
1216                         sta = sta_info_get_bss(sdata, rx_agg->addr);
1217                         if (sta)
1218                                 __ieee80211_stop_rx_ba_session(sta,
1219                                                         rx_agg->tid,
1220                                                         WLAN_BACK_RECIPIENT, 0,
1221                                                         false);
1222                         mutex_unlock(&local->sta_mtx);
1223                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_TDLS_CHSW) {
1224                         ieee80211_process_tdls_channel_switch(sdata, skb);
1225                 } else if (ieee80211_is_action(mgmt->frame_control) &&
1226                            mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1227                         int len = skb->len;
1228
1229                         mutex_lock(&local->sta_mtx);
1230                         sta = sta_info_get_bss(sdata, mgmt->sa);
1231                         if (sta) {
1232                                 switch (mgmt->u.action.u.addba_req.action_code) {
1233                                 case WLAN_ACTION_ADDBA_REQ:
1234                                         ieee80211_process_addba_request(
1235                                                         local, sta, mgmt, len);
1236                                         break;
1237                                 case WLAN_ACTION_ADDBA_RESP:
1238                                         ieee80211_process_addba_resp(local, sta,
1239                                                                      mgmt, len);
1240                                         break;
1241                                 case WLAN_ACTION_DELBA:
1242                                         ieee80211_process_delba(sdata, sta,
1243                                                                 mgmt, len);
1244                                         break;
1245                                 default:
1246                                         WARN_ON(1);
1247                                         break;
1248                                 }
1249                         }
1250                         mutex_unlock(&local->sta_mtx);
1251                 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1252                         struct ieee80211_hdr *hdr = (void *)mgmt;
1253                         /*
1254                          * So the frame isn't mgmt, but frame_control
1255                          * is at the right place anyway, of course, so
1256                          * the if statement is correct.
1257                          *
1258                          * Warn if we have other data frame types here,
1259                          * they must not get here.
1260                          */
1261                         WARN_ON(hdr->frame_control &
1262                                         cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1263                         WARN_ON(!(hdr->seq_ctrl &
1264                                         cpu_to_le16(IEEE80211_SCTL_FRAG)));
1265                         /*
1266                          * This was a fragment of a frame, received while
1267                          * a block-ack session was active. That cannot be
1268                          * right, so terminate the session.
1269                          */
1270                         mutex_lock(&local->sta_mtx);
1271                         sta = sta_info_get_bss(sdata, mgmt->sa);
1272                         if (sta) {
1273                                 u16 tid = *ieee80211_get_qos_ctl(hdr) &
1274                                                 IEEE80211_QOS_CTL_TID_MASK;
1275
1276                                 __ieee80211_stop_rx_ba_session(
1277                                         sta, tid, WLAN_BACK_RECIPIENT,
1278                                         WLAN_REASON_QSTA_REQUIRE_SETUP,
1279                                         true);
1280                         }
1281                         mutex_unlock(&local->sta_mtx);
1282                 } else switch (sdata->vif.type) {
1283                 case NL80211_IFTYPE_STATION:
1284                         ieee80211_sta_rx_queued_mgmt(sdata, skb);
1285                         break;
1286                 case NL80211_IFTYPE_ADHOC:
1287                         ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1288                         break;
1289                 case NL80211_IFTYPE_MESH_POINT:
1290                         if (!ieee80211_vif_is_mesh(&sdata->vif))
1291                                 break;
1292                         ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1293                         break;
1294                 default:
1295                         WARN(1, "frame for unexpected interface type");
1296                         break;
1297                 }
1298
1299                 kfree_skb(skb);
1300         }
1301
1302         /* then other type-dependent work */
1303         switch (sdata->vif.type) {
1304         case NL80211_IFTYPE_STATION:
1305                 ieee80211_sta_work(sdata);
1306                 break;
1307         case NL80211_IFTYPE_ADHOC:
1308                 ieee80211_ibss_work(sdata);
1309                 break;
1310         case NL80211_IFTYPE_MESH_POINT:
1311                 if (!ieee80211_vif_is_mesh(&sdata->vif))
1312                         break;
1313                 ieee80211_mesh_work(sdata);
1314                 break;
1315         case NL80211_IFTYPE_OCB:
1316                 ieee80211_ocb_work(sdata);
1317                 break;
1318         default:
1319                 break;
1320         }
1321 }
1322
1323 static void ieee80211_recalc_smps_work(struct work_struct *work)
1324 {
1325         struct ieee80211_sub_if_data *sdata =
1326                 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1327
1328         ieee80211_recalc_smps(sdata);
1329 }
1330
1331 /*
1332  * Helper function to initialise an interface to a specific type.
1333  */
1334 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1335                                   enum nl80211_iftype type)
1336 {
1337         static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff,
1338                                                     0xff, 0xff, 0xff};
1339
1340         /* clear type-dependent union */
1341         memset(&sdata->u, 0, sizeof(sdata->u));
1342
1343         /* and set some type-dependent values */
1344         sdata->vif.type = type;
1345         sdata->vif.p2p = false;
1346         sdata->wdev.iftype = type;
1347
1348         sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1349         sdata->control_port_no_encrypt = false;
1350         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1351         sdata->vif.bss_conf.idle = true;
1352
1353         sdata->noack_map = 0;
1354
1355         /* only monitor/p2p-device differ */
1356         if (sdata->dev) {
1357                 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1358                 sdata->dev->type = ARPHRD_ETHER;
1359         }
1360
1361         skb_queue_head_init(&sdata->skb_queue);
1362         INIT_WORK(&sdata->work, ieee80211_iface_work);
1363         INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1364         INIT_WORK(&sdata->csa_finalize_work, ieee80211_csa_finalize_work);
1365         INIT_LIST_HEAD(&sdata->assigned_chanctx_list);
1366         INIT_LIST_HEAD(&sdata->reserved_chanctx_list);
1367
1368         switch (type) {
1369         case NL80211_IFTYPE_P2P_GO:
1370                 type = NL80211_IFTYPE_AP;
1371                 sdata->vif.type = type;
1372                 sdata->vif.p2p = true;
1373                 /* fall through */
1374         case NL80211_IFTYPE_AP:
1375                 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1376                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1377                 INIT_WORK(&sdata->u.ap.request_smps_work,
1378                           ieee80211_request_smps_ap_work);
1379                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1380                 sdata->u.ap.req_smps = IEEE80211_SMPS_OFF;
1381                 break;
1382         case NL80211_IFTYPE_P2P_CLIENT:
1383                 type = NL80211_IFTYPE_STATION;
1384                 sdata->vif.type = type;
1385                 sdata->vif.p2p = true;
1386                 /* fall through */
1387         case NL80211_IFTYPE_STATION:
1388                 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1389                 ieee80211_sta_setup_sdata(sdata);
1390                 break;
1391         case NL80211_IFTYPE_OCB:
1392                 sdata->vif.bss_conf.bssid = bssid_wildcard;
1393                 ieee80211_ocb_setup_sdata(sdata);
1394                 break;
1395         case NL80211_IFTYPE_ADHOC:
1396                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1397                 ieee80211_ibss_setup_sdata(sdata);
1398                 break;
1399         case NL80211_IFTYPE_MESH_POINT:
1400                 if (ieee80211_vif_is_mesh(&sdata->vif))
1401                         ieee80211_mesh_init_sdata(sdata);
1402                 break;
1403         case NL80211_IFTYPE_MONITOR:
1404                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1405                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1406                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
1407                                       MONITOR_FLAG_OTHER_BSS;
1408                 break;
1409         case NL80211_IFTYPE_WDS:
1410                 sdata->vif.bss_conf.bssid = NULL;
1411                 break;
1412         case NL80211_IFTYPE_AP_VLAN:
1413         case NL80211_IFTYPE_P2P_DEVICE:
1414                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1415                 break;
1416         case NL80211_IFTYPE_UNSPECIFIED:
1417         case NUM_NL80211_IFTYPES:
1418                 BUG();
1419                 break;
1420         }
1421
1422         ieee80211_debugfs_add_netdev(sdata);
1423 }
1424
1425 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1426                                            enum nl80211_iftype type)
1427 {
1428         struct ieee80211_local *local = sdata->local;
1429         int ret, err;
1430         enum nl80211_iftype internal_type = type;
1431         bool p2p = false;
1432
1433         ASSERT_RTNL();
1434
1435         if (!local->ops->change_interface)
1436                 return -EBUSY;
1437
1438         switch (sdata->vif.type) {
1439         case NL80211_IFTYPE_AP:
1440         case NL80211_IFTYPE_STATION:
1441         case NL80211_IFTYPE_ADHOC:
1442         case NL80211_IFTYPE_OCB:
1443                 /*
1444                  * Could maybe also all others here?
1445                  * Just not sure how that interacts
1446                  * with the RX/config path e.g. for
1447                  * mesh.
1448                  */
1449                 break;
1450         default:
1451                 return -EBUSY;
1452         }
1453
1454         switch (type) {
1455         case NL80211_IFTYPE_AP:
1456         case NL80211_IFTYPE_STATION:
1457         case NL80211_IFTYPE_ADHOC:
1458         case NL80211_IFTYPE_OCB:
1459                 /*
1460                  * Could probably support everything
1461                  * but WDS here (WDS do_open can fail
1462                  * under memory pressure, which this
1463                  * code isn't prepared to handle).
1464                  */
1465                 break;
1466         case NL80211_IFTYPE_P2P_CLIENT:
1467                 p2p = true;
1468                 internal_type = NL80211_IFTYPE_STATION;
1469                 break;
1470         case NL80211_IFTYPE_P2P_GO:
1471                 p2p = true;
1472                 internal_type = NL80211_IFTYPE_AP;
1473                 break;
1474         default:
1475                 return -EBUSY;
1476         }
1477
1478         ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1479         if (ret)
1480                 return ret;
1481
1482         ieee80211_do_stop(sdata, false);
1483
1484         ieee80211_teardown_sdata(sdata);
1485
1486         ret = drv_change_interface(local, sdata, internal_type, p2p);
1487         if (ret)
1488                 type = ieee80211_vif_type_p2p(&sdata->vif);
1489
1490         /*
1491          * Ignore return value here, there's not much we can do since
1492          * the driver changed the interface type internally already.
1493          * The warnings will hopefully make driver authors fix it :-)
1494          */
1495         ieee80211_check_queues(sdata, type);
1496
1497         ieee80211_setup_sdata(sdata, type);
1498
1499         err = ieee80211_do_open(&sdata->wdev, false);
1500         WARN(err, "type change: do_open returned %d", err);
1501
1502         return ret;
1503 }
1504
1505 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1506                              enum nl80211_iftype type)
1507 {
1508         int ret;
1509
1510         ASSERT_RTNL();
1511
1512         if (type == ieee80211_vif_type_p2p(&sdata->vif))
1513                 return 0;
1514
1515         if (ieee80211_sdata_running(sdata)) {
1516                 ret = ieee80211_runtime_change_iftype(sdata, type);
1517                 if (ret)
1518                         return ret;
1519         } else {
1520                 /* Purge and reset type-dependent state. */
1521                 ieee80211_teardown_sdata(sdata);
1522                 ieee80211_setup_sdata(sdata, type);
1523         }
1524
1525         /* reset some values that shouldn't be kept across type changes */
1526         if (type == NL80211_IFTYPE_STATION)
1527                 sdata->u.mgd.use_4addr = false;
1528
1529         return 0;
1530 }
1531
1532 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1533                                        u8 *perm_addr, enum nl80211_iftype type)
1534 {
1535         struct ieee80211_sub_if_data *sdata;
1536         u64 mask, start, addr, val, inc;
1537         u8 *m;
1538         u8 tmp_addr[ETH_ALEN];
1539         int i;
1540
1541         /* default ... something at least */
1542         memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1543
1544         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1545             local->hw.wiphy->n_addresses <= 1)
1546                 return;
1547
1548         mutex_lock(&local->iflist_mtx);
1549
1550         switch (type) {
1551         case NL80211_IFTYPE_MONITOR:
1552                 /* doesn't matter */
1553                 break;
1554         case NL80211_IFTYPE_WDS:
1555         case NL80211_IFTYPE_AP_VLAN:
1556                 /* match up with an AP interface */
1557                 list_for_each_entry(sdata, &local->interfaces, list) {
1558                         if (sdata->vif.type != NL80211_IFTYPE_AP)
1559                                 continue;
1560                         memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1561                         break;
1562                 }
1563                 /* keep default if no AP interface present */
1564                 break;
1565         case NL80211_IFTYPE_P2P_CLIENT:
1566         case NL80211_IFTYPE_P2P_GO:
1567                 if (local->hw.flags & IEEE80211_HW_P2P_DEV_ADDR_FOR_INTF) {
1568                         list_for_each_entry(sdata, &local->interfaces, list) {
1569                                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1570                                         continue;
1571                                 if (!ieee80211_sdata_running(sdata))
1572                                         continue;
1573                                 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1574                                 goto out_unlock;
1575                         }
1576                 }
1577                 /* otherwise fall through */
1578         default:
1579                 /* assign a new address if possible -- try n_addresses first */
1580                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1581                         bool used = false;
1582
1583                         list_for_each_entry(sdata, &local->interfaces, list) {
1584                                 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr,
1585                                                      sdata->vif.addr)) {
1586                                         used = true;
1587                                         break;
1588                                 }
1589                         }
1590
1591                         if (!used) {
1592                                 memcpy(perm_addr,
1593                                        local->hw.wiphy->addresses[i].addr,
1594                                        ETH_ALEN);
1595                                 break;
1596                         }
1597                 }
1598
1599                 /* try mask if available */
1600                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1601                         break;
1602
1603                 m = local->hw.wiphy->addr_mask;
1604                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1605                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1606                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1607
1608                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1609                         /* not a contiguous mask ... not handled now! */
1610                         pr_info("not contiguous\n");
1611                         break;
1612                 }
1613
1614                 /*
1615                  * Pick address of existing interface in case user changed
1616                  * MAC address manually, default to perm_addr.
1617                  */
1618                 m = local->hw.wiphy->perm_addr;
1619                 list_for_each_entry(sdata, &local->interfaces, list) {
1620                         if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
1621                                 continue;
1622                         m = sdata->vif.addr;
1623                         break;
1624                 }
1625                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1626                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1627                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1628
1629                 inc = 1ULL<<__ffs64(mask);
1630                 val = (start & mask);
1631                 addr = (start & ~mask) | (val & mask);
1632                 do {
1633                         bool used = false;
1634
1635                         tmp_addr[5] = addr >> 0*8;
1636                         tmp_addr[4] = addr >> 1*8;
1637                         tmp_addr[3] = addr >> 2*8;
1638                         tmp_addr[2] = addr >> 3*8;
1639                         tmp_addr[1] = addr >> 4*8;
1640                         tmp_addr[0] = addr >> 5*8;
1641
1642                         val += inc;
1643
1644                         list_for_each_entry(sdata, &local->interfaces, list) {
1645                                 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) {
1646                                         used = true;
1647                                         break;
1648                                 }
1649                         }
1650
1651                         if (!used) {
1652                                 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1653                                 break;
1654                         }
1655                         addr = (start & ~mask) | (val & mask);
1656                 } while (addr != start);
1657
1658                 break;
1659         }
1660
1661  out_unlock:
1662         mutex_unlock(&local->iflist_mtx);
1663 }
1664
1665 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1666                      unsigned char name_assign_type,
1667                      struct wireless_dev **new_wdev, enum nl80211_iftype type,
1668                      struct vif_params *params)
1669 {
1670         struct net_device *ndev = NULL;
1671         struct ieee80211_sub_if_data *sdata = NULL;
1672         struct txq_info *txqi;
1673         int ret, i;
1674         int txqs = 1;
1675
1676         ASSERT_RTNL();
1677
1678         if (type == NL80211_IFTYPE_P2P_DEVICE) {
1679                 struct wireless_dev *wdev;
1680
1681                 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1682                                 GFP_KERNEL);
1683                 if (!sdata)
1684                         return -ENOMEM;
1685                 wdev = &sdata->wdev;
1686
1687                 sdata->dev = NULL;
1688                 strlcpy(sdata->name, name, IFNAMSIZ);
1689                 ieee80211_assign_perm_addr(local, wdev->address, type);
1690                 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1691         } else {
1692                 int size = ALIGN(sizeof(*sdata) + local->hw.vif_data_size,
1693                                  sizeof(void *));
1694                 int txq_size = 0;
1695
1696                 if (local->ops->wake_tx_queue)
1697                         txq_size += sizeof(struct txq_info) +
1698                                     local->hw.txq_data_size;
1699
1700                 if (local->hw.queues >= IEEE80211_NUM_ACS)
1701                         txqs = IEEE80211_NUM_ACS;
1702
1703                 ndev = alloc_netdev_mqs(size + txq_size,
1704                                         name, name_assign_type,
1705                                         ieee80211_if_setup, txqs, 1);
1706                 if (!ndev)
1707                         return -ENOMEM;
1708                 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1709
1710                 ndev->needed_headroom = local->tx_headroom +
1711                                         4*6 /* four MAC addresses */
1712                                         + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1713                                         + 6 /* mesh */
1714                                         + 8 /* rfc1042/bridge tunnel */
1715                                         - ETH_HLEN /* ethernet hard_header_len */
1716                                         + IEEE80211_ENCRYPT_HEADROOM;
1717                 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1718
1719                 ret = dev_alloc_name(ndev, ndev->name);
1720                 if (ret < 0) {
1721                         free_netdev(ndev);
1722                         return ret;
1723                 }
1724
1725                 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1726                 if (params && is_valid_ether_addr(params->macaddr))
1727                         memcpy(ndev->dev_addr, params->macaddr, ETH_ALEN);
1728                 else
1729                         memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1730                 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1731
1732                 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1733                 sdata = netdev_priv(ndev);
1734                 ndev->ieee80211_ptr = &sdata->wdev;
1735                 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1736                 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1737
1738                 if (txq_size) {
1739                         txqi = netdev_priv(ndev) + size;
1740                         ieee80211_init_tx_queue(sdata, NULL, txqi, 0);
1741                 }
1742
1743                 sdata->dev = ndev;
1744         }
1745
1746         /* initialise type-independent data */
1747         sdata->wdev.wiphy = local->hw.wiphy;
1748         sdata->local = local;
1749
1750         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1751                 skb_queue_head_init(&sdata->fragments[i].skb_list);
1752
1753         INIT_LIST_HEAD(&sdata->key_list);
1754
1755         INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
1756                           ieee80211_dfs_cac_timer_work);
1757         INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
1758                           ieee80211_delayed_tailroom_dec);
1759
1760         for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1761                 struct ieee80211_supported_band *sband;
1762                 sband = local->hw.wiphy->bands[i];
1763                 sdata->rc_rateidx_mask[i] =
1764                         sband ? (1 << sband->n_bitrates) - 1 : 0;
1765                 if (sband)
1766                         memcpy(sdata->rc_rateidx_mcs_mask[i],
1767                                sband->ht_cap.mcs.rx_mask,
1768                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1769                 else
1770                         memset(sdata->rc_rateidx_mcs_mask[i], 0,
1771                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1772         }
1773
1774         ieee80211_set_default_queues(sdata);
1775
1776         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1777         sdata->user_power_level = local->user_power_level;
1778
1779         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1780
1781         /* setup type-dependent data */
1782         ieee80211_setup_sdata(sdata, type);
1783
1784         if (ndev) {
1785                 if (params) {
1786                         ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1787                         if (type == NL80211_IFTYPE_STATION)
1788                                 sdata->u.mgd.use_4addr = params->use_4addr;
1789                 }
1790
1791                 ndev->features |= local->hw.netdev_features;
1792
1793                 netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops);
1794
1795                 ret = register_netdevice(ndev);
1796                 if (ret) {
1797                         free_netdev(ndev);
1798                         return ret;
1799                 }
1800         }
1801
1802         mutex_lock(&local->iflist_mtx);
1803         list_add_tail_rcu(&sdata->list, &local->interfaces);
1804         mutex_unlock(&local->iflist_mtx);
1805
1806         if (new_wdev)
1807                 *new_wdev = &sdata->wdev;
1808
1809         return 0;
1810 }
1811
1812 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1813 {
1814         ASSERT_RTNL();
1815
1816         mutex_lock(&sdata->local->iflist_mtx);
1817         list_del_rcu(&sdata->list);
1818         mutex_unlock(&sdata->local->iflist_mtx);
1819
1820         synchronize_rcu();
1821
1822         if (sdata->dev) {
1823                 unregister_netdevice(sdata->dev);
1824         } else {
1825                 cfg80211_unregister_wdev(&sdata->wdev);
1826                 kfree(sdata);
1827         }
1828 }
1829
1830 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
1831 {
1832         if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
1833                 return;
1834         ieee80211_do_stop(sdata, true);
1835         ieee80211_teardown_sdata(sdata);
1836 }
1837
1838 /*
1839  * Remove all interfaces, may only be called at hardware unregistration
1840  * time because it doesn't do RCU-safe list removals.
1841  */
1842 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1843 {
1844         struct ieee80211_sub_if_data *sdata, *tmp;
1845         LIST_HEAD(unreg_list);
1846         LIST_HEAD(wdev_list);
1847
1848         ASSERT_RTNL();
1849
1850         /*
1851          * Close all AP_VLAN interfaces first, as otherwise they
1852          * might be closed while the AP interface they belong to
1853          * is closed, causing unregister_netdevice_many() to crash.
1854          */
1855         list_for_each_entry(sdata, &local->interfaces, list)
1856                 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1857                         dev_close(sdata->dev);
1858
1859         mutex_lock(&local->iflist_mtx);
1860         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1861                 list_del(&sdata->list);
1862
1863                 if (sdata->dev)
1864                         unregister_netdevice_queue(sdata->dev, &unreg_list);
1865                 else
1866                         list_add(&sdata->list, &wdev_list);
1867         }
1868         mutex_unlock(&local->iflist_mtx);
1869         unregister_netdevice_many(&unreg_list);
1870
1871         list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
1872                 list_del(&sdata->list);
1873                 cfg80211_unregister_wdev(&sdata->wdev);
1874                 kfree(sdata);
1875         }
1876 }
1877
1878 static int netdev_notify(struct notifier_block *nb,
1879                          unsigned long state, void *ptr)
1880 {
1881         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1882         struct ieee80211_sub_if_data *sdata;
1883
1884         if (state != NETDEV_CHANGENAME)
1885                 return NOTIFY_DONE;
1886
1887         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1888                 return NOTIFY_DONE;
1889
1890         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1891                 return NOTIFY_DONE;
1892
1893         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1894         memcpy(sdata->name, dev->name, IFNAMSIZ);
1895         ieee80211_debugfs_rename_netdev(sdata);
1896
1897         return NOTIFY_OK;
1898 }
1899
1900 static struct notifier_block mac80211_netdev_notifier = {
1901         .notifier_call = netdev_notify,
1902 };
1903
1904 int ieee80211_iface_init(void)
1905 {
1906         return register_netdevice_notifier(&mac80211_netdev_notifier);
1907 }
1908
1909 void ieee80211_iface_exit(void)
1910 {
1911         unregister_netdevice_notifier(&mac80211_netdev_notifier);
1912 }