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                               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                 break;
 526                 }
 527         case NL80211_IFTYPE_AP:
 528                 sdata->bss = &sdata->u.ap;
 529                 break;
 530         case NL80211_IFTYPE_MESH_POINT:
 531         case NL80211_IFTYPE_STATION:
 532         case NL80211_IFTYPE_MONITOR:
 533         case NL80211_IFTYPE_ADHOC:
 534         case NL80211_IFTYPE_P2P_DEVICE:
 535         case NL80211_IFTYPE_OCB:
 536                 /* no special treatment */
 537                 break;
 538         case NL80211_IFTYPE_UNSPECIFIED:
 539         case NUM_NL80211_IFTYPES:
 540         case NL80211_IFTYPE_P2P_CLIENT:
 541         case NL80211_IFTYPE_P2P_GO:
 542                 /* cannot happen */
 543                 WARN_ON(1);
 544                 break;
 545         }
 546
 547         if (local->open_count == 0) {
 548                 res = drv_start(local);
 549                 if (res)
 550                         goto err_del_bss;
 551                 /* we're brought up, everything changes */
 552                 hw_reconf_flags = ~0;
 553                 ieee80211_led_radio(local, true);
 554                 ieee80211_mod_tpt_led_trig(local,
 555                                            IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
 556         }
 557
 558         /*
 559          * Copy the hopefully now-present MAC address to
 560          * this interface, if it has the special null one.
 561          */
 562         if (dev && is_zero_ether_addr(dev->dev_addr)) {
 563                 memcpy(dev->dev_addr,
 564                        local->hw.wiphy->perm_addr,
 565                        ETH_ALEN);
 566                 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
 567
 568                 if (!is_valid_ether_addr(dev->dev_addr)) {
 569                         res = -EADDRNOTAVAIL;
 570                         goto err_stop;
 571                 }
 572         }
 573
 574         switch (sdata->vif.type) {
 575         case NL80211_IFTYPE_AP_VLAN:
 576                 /* no need to tell driver, but set carrier and chanctx */
 577                 if (rtnl_dereference(sdata->bss->beacon)) {
 578                         ieee80211_vif_vlan_copy_chanctx(sdata);
 579                         netif_carrier_on(dev);
 580                 } else {
 581                         netif_carrier_off(dev);
 582                 }
 583                 break;
 584         case NL80211_IFTYPE_MONITOR:
 585                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 586                         local->cooked_mntrs++;
 587                         break;
 588                 }
 589
 590                 if (sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE) {
 591                         res = drv_add_interface(local, sdata);
 592                         if (res)
 593                                 goto err_stop;
 594                 } else if (local->monitors == 0 && local->open_count == 0) {
 595                         res = ieee80211_add_virtual_monitor(local);
 596                         if (res)
 597                                 goto err_stop;
 598                 }
 599
 600                 /* must be before the call to ieee80211_configure_filter */
 601                 local->monitors++;
 602                 if (local->monitors == 1) {
 603                         local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
 604                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 605                 }
 606
 607                 ieee80211_adjust_monitor_flags(sdata, 1);
 608                 ieee80211_configure_filter(local);
 609                 mutex_lock(&local->mtx);
 610                 ieee80211_recalc_idle(local);
 611                 mutex_unlock(&local->mtx);
 612
 613                 netif_carrier_on(dev);
 614                 break;
 615         default:
 616                 if (coming_up) {
 617                         ieee80211_del_virtual_monitor(local);
 618
 619                         res = drv_add_interface(local, sdata);
 620                         if (res)
 621                                 goto err_stop;
 622                         res = ieee80211_check_queues(sdata,
 623                                 ieee80211_vif_type_p2p(&sdata->vif));
 624                         if (res)
 625                                 goto err_del_interface;
 626                 }
 627
 628                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
 629                         local->fif_pspoll++;
 630                         local->fif_probe_req++;
 631
 632                         ieee80211_configure_filter(local);
 633                 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 634                         local->fif_probe_req++;
 635                 }
 636
 637                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
 638                         changed |= ieee80211_reset_erp_info(sdata);
 639                 ieee80211_bss_info_change_notify(sdata, changed);
 640
 641                 switch (sdata->vif.type) {
 642                 case NL80211_IFTYPE_STATION:
 643                 case NL80211_IFTYPE_ADHOC:
 644                 case NL80211_IFTYPE_AP:
 645                 case NL80211_IFTYPE_MESH_POINT:
 646                 case NL80211_IFTYPE_OCB:
 647                         netif_carrier_off(dev);
 648                         break;
 649                 case NL80211_IFTYPE_WDS:
 650                 case NL80211_IFTYPE_P2P_DEVICE:
 651                         break;
 652                 default:
 653                         /* not reached */
 654                         WARN_ON(1);
 655                 }
 656
 657                 /*
 658                  * set default queue parameters so drivers don't
 659                  * need to initialise the hardware if the hardware
 660                  * doesn't start up with sane defaults
 661                  */
 662                 ieee80211_set_wmm_default(sdata, true);
 663         }
 664
 665         set_bit(SDATA_STATE_RUNNING, &sdata->state);
 666
 667         if (sdata->vif.type == NL80211_IFTYPE_WDS) {
 668                 /* Create STA entry for the WDS peer */
 669                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
 670                                      GFP_KERNEL);
 671                 if (!sta) {
 672                         res = -ENOMEM;
 673                         goto err_del_interface;
 674                 }
 675
 676                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
 677                 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
 678                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
 679
 680                 res = sta_info_insert(sta);
 681                 if (res) {
 682                         /* STA has been freed */
 683                         goto err_del_interface;
 684                 }
 685
 686                 rate_control_rate_init(sta);
 687                 netif_carrier_on(dev);
 688         } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
 689                 rcu_assign_pointer(local->p2p_sdata, sdata);
 690         }
 691
 692         /*
 693          * set_multicast_list will be invoked by the networking core
 694          * which will check whether any increments here were done in
 695          * error and sync them down to the hardware as filter flags.
 696          */
 697         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 698                 atomic_inc(&local->iff_allmultis);
 699
 700         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 701                 atomic_inc(&local->iff_promiscs);
 702
 703         if (coming_up)
 704                 local->open_count++;
 705
 706         if (hw_reconf_flags)
 707                 ieee80211_hw_config(local, hw_reconf_flags);
 708
 709         ieee80211_recalc_ps(local, -1);
 710
 711         if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
 712             sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 713                 /* XXX: for AP_VLAN, actually track AP queues */
 714                 netif_tx_start_all_queues(dev);
 715         } else if (dev) {
 716                 unsigned long flags;
 717                 int n_acs = IEEE80211_NUM_ACS;
 718                 int ac;
 719
 720                 if (local->hw.queues < IEEE80211_NUM_ACS)
 721                         n_acs = 1;
 722
 723                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 724                 if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE ||
 725                     (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 &&
 726                      skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) {
 727                         for (ac = 0; ac < n_acs; ac++) {
 728                                 int ac_queue = sdata->vif.hw_queue[ac];
 729
 730                                 if (local->queue_stop_reasons[ac_queue] == 0 &&
 731                                     skb_queue_empty(&local->pending[ac_queue]))
 732                                         netif_start_subqueue(dev, ac);
 733                         }
 734                 }
 735                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 736         }
 737
 738         return 0;
 739  err_del_interface:
 740         drv_remove_interface(local, sdata);
 741  err_stop:
 742         if (!local->open_count)
 743                 drv_stop(local);
 744  err_del_bss:
 745         sdata->bss = NULL;
 746         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 747                 mutex_lock(&local->mtx);
 748                 list_del(&sdata->u.vlan.list);
 749                 mutex_unlock(&local->mtx);
 750         }
 751         /* might already be clear but that doesn't matter */
 752         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 753         return res;
 754 }
 755
 756 static int ieee80211_open(struct net_device *dev)
 757 {
 758         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 759         int err;
 760
 761         /* fail early if user set an invalid address */
 762         if (!is_valid_ether_addr(dev->dev_addr))
 763                 return -EADDRNOTAVAIL;
 764
 765         err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
 766         if (err)
 767                 return err;
 768
 769         return ieee80211_do_open(&sdata->wdev, true);
 770 }
 771
 772 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
 773                               bool going_down)
 774 {
 775         struct ieee80211_local *local = sdata->local;
 776         unsigned long flags;
 777         struct sk_buff *skb, *tmp;
 778         u32 hw_reconf_flags = 0;
 779         int i, flushed;
 780         struct ps_data *ps;
 781         struct cfg80211_chan_def chandef;
 782         bool cancel_scan;
 783
 784         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 785
 786         cancel_scan = rcu_access_pointer(local->scan_sdata) == sdata;
 787         if (cancel_scan)
 788                 ieee80211_scan_cancel(local);
 789
 790         /*
 791          * Stop TX on this interface first.
 792          */
 793         if (sdata->dev)
 794                 netif_tx_stop_all_queues(sdata->dev);
 795
 796         ieee80211_roc_purge(local, sdata);
 797
 798         switch (sdata->vif.type) {
 799         case NL80211_IFTYPE_STATION:
 800                 ieee80211_mgd_stop(sdata);
 801                 break;
 802         case NL80211_IFTYPE_ADHOC:
 803                 ieee80211_ibss_stop(sdata);
 804                 break;
 805         case NL80211_IFTYPE_AP:
 806                 cancel_work_sync(&sdata->u.ap.request_smps_work);
 807                 break;
 808         default:
 809                 break;
 810         }
 811
 812         /*
 813          * Remove all stations associated with this interface.
 814          *
 815          * This must be done before calling ops->remove_interface()
 816          * because otherwise we can later invoke ops->sta_notify()
 817          * whenever the STAs are removed, and that invalidates driver
 818          * assumptions about always getting a vif pointer that is valid
 819          * (because if we remove a STA after ops->remove_interface()
 820          * the driver will have removed the vif info already!)
 821          *
 822          * This is relevant only in WDS mode, in all other modes we've
 823          * already removed all stations when disconnecting or similar,
 824          * so warn otherwise.
 825          */
 826         flushed = sta_info_flush(sdata);
 827         WARN_ON_ONCE((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) ||
 828                      (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1));
 829
 830         /* don't count this interface for promisc/allmulti while it is down */
 831         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 832                 atomic_dec(&local->iff_allmultis);
 833
 834         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 835                 atomic_dec(&local->iff_promiscs);
 836
 837         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 838                 local->fif_pspoll--;
 839                 local->fif_probe_req--;
 840         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 841                 local->fif_probe_req--;
 842         }
 843
 844         if (sdata->dev) {
 845                 netif_addr_lock_bh(sdata->dev);
 846                 spin_lock_bh(&local->filter_lock);
 847                 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
 848                                  sdata->dev->addr_len);
 849                 spin_unlock_bh(&local->filter_lock);
 850                 netif_addr_unlock_bh(sdata->dev);
 851         }
 852
 853         del_timer_sync(&local->dynamic_ps_timer);
 854         cancel_work_sync(&local->dynamic_ps_enable_work);
 855
 856         cancel_work_sync(&sdata->recalc_smps);
 857         sdata_lock(sdata);
 858         mutex_lock(&local->mtx);
 859         sdata->vif.csa_active = false;
 860         if (sdata->vif.type == NL80211_IFTYPE_STATION)
 861                 sdata->u.mgd.csa_waiting_bcn = false;
 862         if (sdata->csa_block_tx) {
 863                 ieee80211_wake_vif_queues(local, sdata,
 864                                           IEEE80211_QUEUE_STOP_REASON_CSA);
 865                 sdata->csa_block_tx = false;
 866         }
 867         mutex_unlock(&local->mtx);
 868         sdata_unlock(sdata);
 869
 870         cancel_work_sync(&sdata->csa_finalize_work);
 871
 872         cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
 873
 874         if (sdata->wdev.cac_started) {
 875                 chandef = sdata->vif.bss_conf.chandef;
 876                 WARN_ON(local->suspended);
 877                 mutex_lock(&local->mtx);
 878                 ieee80211_vif_release_channel(sdata);
 879                 mutex_unlock(&local->mtx);
 880                 cfg80211_cac_event(sdata->dev, &chandef,
 881                                    NL80211_RADAR_CAC_ABORTED,
 882                                    GFP_KERNEL);
 883         }
 884
 885         /* APs need special treatment */
 886         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 887                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
 888
 889                 /* down all dependent devices, that is VLANs */
 890                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
 891                                          u.vlan.list)
 892                         dev_close(vlan->dev);
 893                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
 894         } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 895                 /* remove all packets in parent bc_buf pointing to this dev */
 896                 ps = &sdata->bss->ps;
 897
 898                 spin_lock_irqsave(&ps->bc_buf.lock, flags);
 899                 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
 900                         if (skb->dev == sdata->dev) {
 901                                 __skb_unlink(skb, &ps->bc_buf);
 902                                 local->total_ps_buffered--;
 903                                 ieee80211_free_txskb(&local->hw, skb);
 904                         }
 905                 }
 906                 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
 907         }
 908
 909         if (going_down)
 910                 local->open_count--;
 911
 912         switch (sdata->vif.type) {
 913         case NL80211_IFTYPE_AP_VLAN:
 914                 mutex_lock(&local->mtx);
 915                 list_del(&sdata->u.vlan.list);
 916                 mutex_unlock(&local->mtx);
 917                 RCU_INIT_POINTER(sdata->vif.chanctx_conf, NULL);
 918                 /* see comment in the default case below */
 919                 ieee80211_free_keys(sdata, true);
 920                 /* no need to tell driver */
 921                 break;
 922         case NL80211_IFTYPE_MONITOR:
 923                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 924                         local->cooked_mntrs--;
 925                         break;
 926                 }
 927
 928                 local->monitors--;
 929                 if (local->monitors == 0) {
 930                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
 931                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 932                 }
 933
 934                 ieee80211_adjust_monitor_flags(sdata, -1);
 935                 break;
 936         case NL80211_IFTYPE_P2P_DEVICE:
 937                 /* relies on synchronize_rcu() below */
 938                 RCU_INIT_POINTER(local->p2p_sdata, NULL);
 939                 /* fall through */
 940         default:
 941                 cancel_work_sync(&sdata->work);
 942                 /*
 943                  * When we get here, the interface is marked down.
 944                  * Free the remaining keys, if there are any
 945                  * (which can happen in AP mode if userspace sets
 946                  * keys before the interface is operating, and maybe
 947                  * also in WDS mode)
 948                  *
 949                  * Force the key freeing to always synchronize_net()
 950                  * to wait for the RX path in case it is using this
 951                  * interface enqueuing frames at this very time on
 952                  * another CPU.
 953                  */
 954                 ieee80211_free_keys(sdata, true);
 955                 skb_queue_purge(&sdata->skb_queue);
 956         }
 957
 958         sdata->bss = NULL;
 959
 960         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 961         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 962                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
 963                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 964                         if (info->control.vif == &sdata->vif) {
 965                                 __skb_unlink(skb, &local->pending[i]);
 966                                 ieee80211_free_txskb(&local->hw, skb);
 967                         }
 968                 }
 969         }
 970         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 971
 972         if (local->open_count == 0)
 973                 ieee80211_clear_tx_pending(local);
 974
 975         /*
 976          * If the interface goes down while suspended, presumably because
 977          * the device was unplugged and that happens before our resume,
 978          * then the driver is already unconfigured and the remainder of
 979          * this function isn't needed.
 980          * XXX: what about WoWLAN? If the device has software state, e.g.
 981          *      memory allocated, it might expect teardown commands from
 982          *      mac80211 here?
 983          */
 984         if (local->suspended) {
 985                 WARN_ON(local->wowlan);
 986                 WARN_ON(rtnl_dereference(local->monitor_sdata));
 987                 return;
 988         }
 989
 990         switch (sdata->vif.type) {
 991         case NL80211_IFTYPE_AP_VLAN:
 992                 break;
 993         case NL80211_IFTYPE_MONITOR:
 994                 if (local->monitors == 0)
 995                         ieee80211_del_virtual_monitor(local);
 996
 997                 mutex_lock(&local->mtx);
 998                 ieee80211_recalc_idle(local);
 999                 mutex_unlock(&local->mtx);
1000
1001                 if (!(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE))
1002                         break;
1003
1004                 /* fall through */
1005         default:
1006                 if (going_down)
1007                         drv_remove_interface(local, sdata);
1008         }
1009
1010         ieee80211_recalc_ps(local, -1);
1011
1012         if (cancel_scan)
1013                 flush_delayed_work(&local->scan_work);
1014
1015         if (local->open_count == 0) {
1016                 ieee80211_stop_device(local);
1017
1018                 /* no reconfiguring after stop! */
1019                 return;
1020         }
1021
1022         /* do after stop to avoid reconfiguring when we stop anyway */
1023         ieee80211_configure_filter(local);
1024         ieee80211_hw_config(local, hw_reconf_flags);
1025
1026         if (local->monitors == local->open_count)
1027                 ieee80211_add_virtual_monitor(local);
1028 }
1029
1030 static int ieee80211_stop(struct net_device *dev)
1031 {
1032         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1033
1034         ieee80211_do_stop(sdata, true);
1035
1036         return 0;
1037 }
1038
1039 static void ieee80211_set_multicast_list(struct net_device *dev)
1040 {
1041         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1042         struct ieee80211_local *local = sdata->local;
1043         int allmulti, promisc, sdata_allmulti, sdata_promisc;
1044
1045         allmulti = !!(dev->flags & IFF_ALLMULTI);
1046         promisc = !!(dev->flags & IFF_PROMISC);
1047         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
1048         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
1049
1050         if (allmulti != sdata_allmulti) {
1051                 if (dev->flags & IFF_ALLMULTI)
1052                         atomic_inc(&local->iff_allmultis);
1053                 else
1054                         atomic_dec(&local->iff_allmultis);
1055                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
1056         }
1057
1058         if (promisc != sdata_promisc) {
1059                 if (dev->flags & IFF_PROMISC)
1060                         atomic_inc(&local->iff_promiscs);
1061                 else
1062                         atomic_dec(&local->iff_promiscs);
1063                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
1064         }
1065         spin_lock_bh(&local->filter_lock);
1066         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
1067         spin_unlock_bh(&local->filter_lock);
1068         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
1069 }
1070
1071 /*
1072  * Called when the netdev is removed or, by the code below, before
1073  * the interface type changes.
1074  */
1075 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
1076 {
1077         int i;
1078
1079         /* free extra data */
1080         ieee80211_free_keys(sdata, false);
1081
1082         ieee80211_debugfs_remove_netdev(sdata);
1083
1084         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1085                 __skb_queue_purge(&sdata->fragments[i].skb_list);
1086         sdata->fragment_next = 0;
1087
1088         if (ieee80211_vif_is_mesh(&sdata->vif))
1089                 mesh_rmc_free(sdata);
1090 }
1091
1092 static void ieee80211_uninit(struct net_device *dev)
1093 {
1094         ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
1095 }
1096
1097 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
1098                                          struct sk_buff *skb,
1099                                          void *accel_priv,
1100                                          select_queue_fallback_t fallback)
1101 {
1102         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
1103 }
1104
1105 static const struct net_device_ops ieee80211_dataif_ops = {
1106         .ndo_open               = ieee80211_open,
1107         .ndo_stop               = ieee80211_stop,
1108         .ndo_uninit             = ieee80211_uninit,
1109         .ndo_start_xmit         = ieee80211_subif_start_xmit,
1110         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1111         .ndo_change_mtu         = ieee80211_change_mtu,
1112         .ndo_set_mac_address    = ieee80211_change_mac,
1113         .ndo_select_queue       = ieee80211_netdev_select_queue,
1114 };
1115
1116 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
1117                                           struct sk_buff *skb,
1118                                           void *accel_priv,
1119                                           select_queue_fallback_t fallback)
1120 {
1121         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1122         struct ieee80211_local *local = sdata->local;
1123         struct ieee80211_hdr *hdr;
1124         struct ieee80211_radiotap_header *rtap = (void *)skb->data;
1125
1126         if (local->hw.queues < IEEE80211_NUM_ACS)
1127                 return 0;
1128
1129         if (skb->len < 4 ||
1130             skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
1131                 return 0; /* doesn't matter, frame will be dropped */
1132
1133         hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
1134
1135         return ieee80211_select_queue_80211(sdata, skb, hdr);
1136 }
1137
1138 static const struct net_device_ops ieee80211_monitorif_ops = {
1139         .ndo_open               = ieee80211_open,
1140         .ndo_stop               = ieee80211_stop,
1141         .ndo_uninit             = ieee80211_uninit,
1142         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
1143         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1144         .ndo_change_mtu         = ieee80211_change_mtu,
1145         .ndo_set_mac_address    = ieee80211_change_mac,
1146         .ndo_select_queue       = ieee80211_monitor_select_queue,
1147 };
1148
1149 static void ieee80211_if_setup(struct net_device *dev)
1150 {
1151         ether_setup(dev);
1152         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1153         dev->netdev_ops = &ieee80211_dataif_ops;
1154         dev->destructor = free_netdev;
1155 }
1156
1157 static void ieee80211_iface_work(struct work_struct *work)
1158 {
1159         struct ieee80211_sub_if_data *sdata =
1160                 container_of(work, struct ieee80211_sub_if_data, work);
1161         struct ieee80211_local *local = sdata->local;
1162         struct sk_buff *skb;
1163         struct sta_info *sta;
1164         struct ieee80211_ra_tid *ra_tid;
1165         struct ieee80211_rx_agg *rx_agg;
1166
1167         if (!ieee80211_sdata_running(sdata))
1168                 return;
1169
1170         if (local->scanning)
1171                 return;
1172
1173         if (!ieee80211_can_run_worker(local))
1174                 return;
1175
1176         /* first process frames */
1177         while ((skb = skb_dequeue(&sdata->skb_queue))) {
1178                 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1179
1180                 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
1181                         ra_tid = (void *)&skb->cb;
1182                         ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
1183                                                  ra_tid->tid);
1184                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
1185                         ra_tid = (void *)&skb->cb;
1186                         ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
1187                                                 ra_tid->tid);
1188                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_RX_AGG_START) {
1189                         rx_agg = (void *)&skb->cb;
1190                         mutex_lock(&local->sta_mtx);
1191                         sta = sta_info_get_bss(sdata, rx_agg->addr);
1192                         if (sta)
1193                                 __ieee80211_start_rx_ba_session(sta,
1194                                                 0, 0, 0, 1, rx_agg->tid,
1195                                                 IEEE80211_MAX_AMPDU_BUF,
1196                                                 false, true);
1197                         mutex_unlock(&local->sta_mtx);
1198                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_RX_AGG_STOP) {
1199                         rx_agg = (void *)&skb->cb;
1200                         mutex_lock(&local->sta_mtx);
1201                         sta = sta_info_get_bss(sdata, rx_agg->addr);
1202                         if (sta)
1203                                 __ieee80211_stop_rx_ba_session(sta,
1204                                                         rx_agg->tid,
1205                                                         WLAN_BACK_RECIPIENT, 0,
1206                                                         false);
1207                         mutex_unlock(&local->sta_mtx);
1208                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_TDLS_CHSW) {
1209                         ieee80211_process_tdls_channel_switch(sdata, skb);
1210                 } else if (ieee80211_is_action(mgmt->frame_control) &&
1211                            mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1212                         int len = skb->len;
1213
1214                         mutex_lock(&local->sta_mtx);
1215                         sta = sta_info_get_bss(sdata, mgmt->sa);
1216                         if (sta) {
1217                                 switch (mgmt->u.action.u.addba_req.action_code) {
1218                                 case WLAN_ACTION_ADDBA_REQ:
1219                                         ieee80211_process_addba_request(
1220                                                         local, sta, mgmt, len);
1221                                         break;
1222                                 case WLAN_ACTION_ADDBA_RESP:
1223                                         ieee80211_process_addba_resp(local, sta,
1224                                                                      mgmt, len);
1225                                         break;
1226                                 case WLAN_ACTION_DELBA:
1227                                         ieee80211_process_delba(sdata, sta,
1228                                                                 mgmt, len);
1229                                         break;
1230                                 default:
1231                                         WARN_ON(1);
1232                                         break;
1233                                 }
1234                         }
1235                         mutex_unlock(&local->sta_mtx);
1236                 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1237                         struct ieee80211_hdr *hdr = (void *)mgmt;
1238                         /*
1239                          * So the frame isn't mgmt, but frame_control
1240                          * is at the right place anyway, of course, so
1241                          * the if statement is correct.
1242                          *
1243                          * Warn if we have other data frame types here,
1244                          * they must not get here.
1245                          */
1246                         WARN_ON(hdr->frame_control &
1247                                         cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1248                         WARN_ON(!(hdr->seq_ctrl &
1249                                         cpu_to_le16(IEEE80211_SCTL_FRAG)));
1250                         /*
1251                          * This was a fragment of a frame, received while
1252                          * a block-ack session was active. That cannot be
1253                          * right, so terminate the session.
1254                          */
1255                         mutex_lock(&local->sta_mtx);
1256                         sta = sta_info_get_bss(sdata, mgmt->sa);
1257                         if (sta) {
1258                                 u16 tid = *ieee80211_get_qos_ctl(hdr) &
1259                                                 IEEE80211_QOS_CTL_TID_MASK;
1260
1261                                 __ieee80211_stop_rx_ba_session(
1262                                         sta, tid, WLAN_BACK_RECIPIENT,
1263                                         WLAN_REASON_QSTA_REQUIRE_SETUP,
1264                                         true);
1265                         }
1266                         mutex_unlock(&local->sta_mtx);
1267                 } else switch (sdata->vif.type) {
1268                 case NL80211_IFTYPE_STATION:
1269                         ieee80211_sta_rx_queued_mgmt(sdata, skb);
1270                         break;
1271                 case NL80211_IFTYPE_ADHOC:
1272                         ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1273                         break;
1274                 case NL80211_IFTYPE_MESH_POINT:
1275                         if (!ieee80211_vif_is_mesh(&sdata->vif))
1276                                 break;
1277                         ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1278                         break;
1279                 default:
1280                         WARN(1, "frame for unexpected interface type");
1281                         break;
1282                 }
1283
1284                 kfree_skb(skb);
1285         }
1286
1287         /* then other type-dependent work */
1288         switch (sdata->vif.type) {
1289         case NL80211_IFTYPE_STATION:
1290                 ieee80211_sta_work(sdata);
1291                 break;
1292         case NL80211_IFTYPE_ADHOC:
1293                 ieee80211_ibss_work(sdata);
1294                 break;
1295         case NL80211_IFTYPE_MESH_POINT:
1296                 if (!ieee80211_vif_is_mesh(&sdata->vif))
1297                         break;
1298                 ieee80211_mesh_work(sdata);
1299                 break;
1300         case NL80211_IFTYPE_OCB:
1301                 ieee80211_ocb_work(sdata);
1302                 break;
1303         default:
1304                 break;
1305         }
1306 }
1307
1308 static void ieee80211_recalc_smps_work(struct work_struct *work)
1309 {
1310         struct ieee80211_sub_if_data *sdata =
1311                 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1312
1313         ieee80211_recalc_smps(sdata);
1314 }
1315
1316 /*
1317  * Helper function to initialise an interface to a specific type.
1318  */
1319 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1320                                   enum nl80211_iftype type)
1321 {
1322         static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff,
1323                                                     0xff, 0xff, 0xff};
1324
1325         /* clear type-dependent union */
1326         memset(&sdata->u, 0, sizeof(sdata->u));
1327
1328         /* and set some type-dependent values */
1329         sdata->vif.type = type;
1330         sdata->vif.p2p = false;
1331         sdata->wdev.iftype = type;
1332
1333         sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1334         sdata->control_port_no_encrypt = false;
1335         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1336         sdata->vif.bss_conf.idle = true;
1337
1338         sdata->noack_map = 0;
1339
1340         /* only monitor/p2p-device differ */
1341         if (sdata->dev) {
1342                 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1343                 sdata->dev->type = ARPHRD_ETHER;
1344         }
1345
1346         skb_queue_head_init(&sdata->skb_queue);
1347         INIT_WORK(&sdata->work, ieee80211_iface_work);
1348         INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1349         INIT_WORK(&sdata->csa_finalize_work, ieee80211_csa_finalize_work);
1350         INIT_LIST_HEAD(&sdata->assigned_chanctx_list);
1351         INIT_LIST_HEAD(&sdata->reserved_chanctx_list);
1352
1353         switch (type) {
1354         case NL80211_IFTYPE_P2P_GO:
1355                 type = NL80211_IFTYPE_AP;
1356                 sdata->vif.type = type;
1357                 sdata->vif.p2p = true;
1358                 /* fall through */
1359         case NL80211_IFTYPE_AP:
1360                 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1361                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1362                 INIT_WORK(&sdata->u.ap.request_smps_work,
1363                           ieee80211_request_smps_ap_work);
1364                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1365                 sdata->u.ap.req_smps = IEEE80211_SMPS_OFF;
1366                 break;
1367         case NL80211_IFTYPE_P2P_CLIENT:
1368                 type = NL80211_IFTYPE_STATION;
1369                 sdata->vif.type = type;
1370                 sdata->vif.p2p = true;
1371                 /* fall through */
1372         case NL80211_IFTYPE_STATION:
1373                 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1374                 ieee80211_sta_setup_sdata(sdata);
1375                 break;
1376         case NL80211_IFTYPE_OCB:
1377                 sdata->vif.bss_conf.bssid = bssid_wildcard;
1378                 ieee80211_ocb_setup_sdata(sdata);
1379                 break;
1380         case NL80211_IFTYPE_ADHOC:
1381                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1382                 ieee80211_ibss_setup_sdata(sdata);
1383                 break;
1384         case NL80211_IFTYPE_MESH_POINT:
1385                 if (ieee80211_vif_is_mesh(&sdata->vif))
1386                         ieee80211_mesh_init_sdata(sdata);
1387                 break;
1388         case NL80211_IFTYPE_MONITOR:
1389                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1390                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1391                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
1392                                       MONITOR_FLAG_OTHER_BSS;
1393                 break;
1394         case NL80211_IFTYPE_WDS:
1395                 sdata->vif.bss_conf.bssid = NULL;
1396                 break;
1397         case NL80211_IFTYPE_AP_VLAN:
1398         case NL80211_IFTYPE_P2P_DEVICE:
1399                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1400                 break;
1401         case NL80211_IFTYPE_UNSPECIFIED:
1402         case NUM_NL80211_IFTYPES:
1403                 BUG();
1404                 break;
1405         }
1406
1407         ieee80211_debugfs_add_netdev(sdata);
1408 }
1409
1410 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1411                                            enum nl80211_iftype type)
1412 {
1413         struct ieee80211_local *local = sdata->local;
1414         int ret, err;
1415         enum nl80211_iftype internal_type = type;
1416         bool p2p = false;
1417
1418         ASSERT_RTNL();
1419
1420         if (!local->ops->change_interface)
1421                 return -EBUSY;
1422
1423         switch (sdata->vif.type) {
1424         case NL80211_IFTYPE_AP:
1425         case NL80211_IFTYPE_STATION:
1426         case NL80211_IFTYPE_ADHOC:
1427         case NL80211_IFTYPE_OCB:
1428                 /*
1429                  * Could maybe also all others here?
1430                  * Just not sure how that interacts
1431                  * with the RX/config path e.g. for
1432                  * mesh.
1433                  */
1434                 break;
1435         default:
1436                 return -EBUSY;
1437         }
1438
1439         switch (type) {
1440         case NL80211_IFTYPE_AP:
1441         case NL80211_IFTYPE_STATION:
1442         case NL80211_IFTYPE_ADHOC:
1443         case NL80211_IFTYPE_OCB:
1444                 /*
1445                  * Could probably support everything
1446                  * but WDS here (WDS do_open can fail
1447                  * under memory pressure, which this
1448                  * code isn't prepared to handle).
1449                  */
1450                 break;
1451         case NL80211_IFTYPE_P2P_CLIENT:
1452                 p2p = true;
1453                 internal_type = NL80211_IFTYPE_STATION;
1454                 break;
1455         case NL80211_IFTYPE_P2P_GO:
1456                 p2p = true;
1457                 internal_type = NL80211_IFTYPE_AP;
1458                 break;
1459         default:
1460                 return -EBUSY;
1461         }
1462
1463         ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1464         if (ret)
1465                 return ret;
1466
1467         ieee80211_do_stop(sdata, false);
1468
1469         ieee80211_teardown_sdata(sdata);
1470
1471         ret = drv_change_interface(local, sdata, internal_type, p2p);
1472         if (ret)
1473                 type = ieee80211_vif_type_p2p(&sdata->vif);
1474
1475         /*
1476          * Ignore return value here, there's not much we can do since
1477          * the driver changed the interface type internally already.
1478          * The warnings will hopefully make driver authors fix it :-)
1479          */
1480         ieee80211_check_queues(sdata, type);
1481
1482         ieee80211_setup_sdata(sdata, type);
1483
1484         err = ieee80211_do_open(&sdata->wdev, false);
1485         WARN(err, "type change: do_open returned %d", err);
1486
1487         return ret;
1488 }
1489
1490 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1491                              enum nl80211_iftype type)
1492 {
1493         int ret;
1494
1495         ASSERT_RTNL();
1496
1497         if (type == ieee80211_vif_type_p2p(&sdata->vif))
1498                 return 0;
1499
1500         if (ieee80211_sdata_running(sdata)) {
1501                 ret = ieee80211_runtime_change_iftype(sdata, type);
1502                 if (ret)
1503                         return ret;
1504         } else {
1505                 /* Purge and reset type-dependent state. */
1506                 ieee80211_teardown_sdata(sdata);
1507                 ieee80211_setup_sdata(sdata, type);
1508         }
1509
1510         /* reset some values that shouldn't be kept across type changes */
1511         sdata->drop_unencrypted = 0;
1512         if (type == NL80211_IFTYPE_STATION)
1513                 sdata->u.mgd.use_4addr = false;
1514
1515         return 0;
1516 }
1517
1518 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1519                                        u8 *perm_addr, enum nl80211_iftype type)
1520 {
1521         struct ieee80211_sub_if_data *sdata;
1522         u64 mask, start, addr, val, inc;
1523         u8 *m;
1524         u8 tmp_addr[ETH_ALEN];
1525         int i;
1526
1527         /* default ... something at least */
1528         memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1529
1530         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1531             local->hw.wiphy->n_addresses <= 1)
1532                 return;
1533
1534         mutex_lock(&local->iflist_mtx);
1535
1536         switch (type) {
1537         case NL80211_IFTYPE_MONITOR:
1538                 /* doesn't matter */
1539                 break;
1540         case NL80211_IFTYPE_WDS:
1541         case NL80211_IFTYPE_AP_VLAN:
1542                 /* match up with an AP interface */
1543                 list_for_each_entry(sdata, &local->interfaces, list) {
1544                         if (sdata->vif.type != NL80211_IFTYPE_AP)
1545                                 continue;
1546                         memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1547                         break;
1548                 }
1549                 /* keep default if no AP interface present */
1550                 break;
1551         case NL80211_IFTYPE_P2P_CLIENT:
1552         case NL80211_IFTYPE_P2P_GO:
1553                 if (local->hw.flags & IEEE80211_HW_P2P_DEV_ADDR_FOR_INTF) {
1554                         list_for_each_entry(sdata, &local->interfaces, list) {
1555                                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1556                                         continue;
1557                                 if (!ieee80211_sdata_running(sdata))
1558                                         continue;
1559                                 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1560                                 goto out_unlock;
1561                         }
1562                 }
1563                 /* otherwise fall through */
1564         default:
1565                 /* assign a new address if possible -- try n_addresses first */
1566                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1567                         bool used = false;
1568
1569                         list_for_each_entry(sdata, &local->interfaces, list) {
1570                                 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr,
1571                                                      sdata->vif.addr)) {
1572                                         used = true;
1573                                         break;
1574                                 }
1575                         }
1576
1577                         if (!used) {
1578                                 memcpy(perm_addr,
1579                                        local->hw.wiphy->addresses[i].addr,
1580                                        ETH_ALEN);
1581                                 break;
1582                         }
1583                 }
1584
1585                 /* try mask if available */
1586                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1587                         break;
1588
1589                 m = local->hw.wiphy->addr_mask;
1590                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1591                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1592                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1593
1594                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1595                         /* not a contiguous mask ... not handled now! */
1596                         pr_info("not contiguous\n");
1597                         break;
1598                 }
1599
1600                 /*
1601                  * Pick address of existing interface in case user changed
1602                  * MAC address manually, default to perm_addr.
1603                  */
1604                 m = local->hw.wiphy->perm_addr;
1605                 list_for_each_entry(sdata, &local->interfaces, list) {
1606                         if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
1607                                 continue;
1608                         m = sdata->vif.addr;
1609                         break;
1610                 }
1611                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1612                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1613                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1614
1615                 inc = 1ULL<<__ffs64(mask);
1616                 val = (start & mask);
1617                 addr = (start & ~mask) | (val & mask);
1618                 do {
1619                         bool used = false;
1620
1621                         tmp_addr[5] = addr >> 0*8;
1622                         tmp_addr[4] = addr >> 1*8;
1623                         tmp_addr[3] = addr >> 2*8;
1624                         tmp_addr[2] = addr >> 3*8;
1625                         tmp_addr[1] = addr >> 4*8;
1626                         tmp_addr[0] = addr >> 5*8;
1627
1628                         val += inc;
1629
1630                         list_for_each_entry(sdata, &local->interfaces, list) {
1631                                 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) {
1632                                         used = true;
1633                                         break;
1634                                 }
1635                         }
1636
1637                         if (!used) {
1638                                 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1639                                 break;
1640                         }
1641                         addr = (start & ~mask) | (val & mask);
1642                 } while (addr != start);
1643
1644                 break;
1645         }
1646
1647  out_unlock:
1648         mutex_unlock(&local->iflist_mtx);
1649 }
1650
1651 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1652                      struct wireless_dev **new_wdev, enum nl80211_iftype type,
1653                      struct vif_params *params)
1654 {
1655         struct net_device *ndev = NULL;
1656         struct ieee80211_sub_if_data *sdata = NULL;
1657         int ret, i;
1658         int txqs = 1;
1659
1660         ASSERT_RTNL();
1661
1662         if (type == NL80211_IFTYPE_P2P_DEVICE) {
1663                 struct wireless_dev *wdev;
1664
1665                 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1666                                 GFP_KERNEL);
1667                 if (!sdata)
1668                         return -ENOMEM;
1669                 wdev = &sdata->wdev;
1670
1671                 sdata->dev = NULL;
1672                 strlcpy(sdata->name, name, IFNAMSIZ);
1673                 ieee80211_assign_perm_addr(local, wdev->address, type);
1674                 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1675         } else {
1676                 if (local->hw.queues >= IEEE80211_NUM_ACS)
1677                         txqs = IEEE80211_NUM_ACS;
1678
1679                 ndev = alloc_netdev_mqs(sizeof(*sdata) + local->hw.vif_data_size,
1680                                         name, NET_NAME_UNKNOWN,
1681                                         ieee80211_if_setup, txqs, 1);
1682                 if (!ndev)
1683                         return -ENOMEM;
1684                 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1685
1686                 ndev->needed_headroom = local->tx_headroom +
1687                                         4*6 /* four MAC addresses */
1688                                         + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1689                                         + 6 /* mesh */
1690                                         + 8 /* rfc1042/bridge tunnel */
1691                                         - ETH_HLEN /* ethernet hard_header_len */
1692                                         + IEEE80211_ENCRYPT_HEADROOM;
1693                 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1694
1695                 ret = dev_alloc_name(ndev, ndev->name);
1696                 if (ret < 0) {
1697                         free_netdev(ndev);
1698                         return ret;
1699                 }
1700
1701                 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1702                 if (params && is_valid_ether_addr(params->macaddr))
1703                         memcpy(ndev->dev_addr, params->macaddr, ETH_ALEN);
1704                 else
1705                         memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1706                 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1707
1708                 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1709                 sdata = netdev_priv(ndev);
1710                 ndev->ieee80211_ptr = &sdata->wdev;
1711                 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1712                 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1713
1714                 sdata->dev = ndev;
1715         }
1716
1717         /* initialise type-independent data */
1718         sdata->wdev.wiphy = local->hw.wiphy;
1719         sdata->local = local;
1720
1721         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1722                 skb_queue_head_init(&sdata->fragments[i].skb_list);
1723
1724         INIT_LIST_HEAD(&sdata->key_list);
1725
1726         INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
1727                           ieee80211_dfs_cac_timer_work);
1728         INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
1729                           ieee80211_delayed_tailroom_dec);
1730
1731         for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1732                 struct ieee80211_supported_band *sband;
1733                 sband = local->hw.wiphy->bands[i];
1734                 sdata->rc_rateidx_mask[i] =
1735                         sband ? (1 << sband->n_bitrates) - 1 : 0;
1736                 if (sband)
1737                         memcpy(sdata->rc_rateidx_mcs_mask[i],
1738                                sband->ht_cap.mcs.rx_mask,
1739                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1740                 else
1741                         memset(sdata->rc_rateidx_mcs_mask[i], 0,
1742                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1743         }
1744
1745         ieee80211_set_default_queues(sdata);
1746
1747         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1748         sdata->user_power_level = local->user_power_level;
1749
1750         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1751
1752         /* setup type-dependent data */
1753         ieee80211_setup_sdata(sdata, type);
1754
1755         if (ndev) {
1756                 if (params) {
1757                         ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1758                         if (type == NL80211_IFTYPE_STATION)
1759                                 sdata->u.mgd.use_4addr = params->use_4addr;
1760                 }
1761
1762                 ndev->features |= local->hw.netdev_features;
1763
1764                 netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops);
1765
1766                 ret = register_netdevice(ndev);
1767                 if (ret) {
1768                         free_netdev(ndev);
1769                         return ret;
1770                 }
1771         }
1772
1773         mutex_lock(&local->iflist_mtx);
1774         list_add_tail_rcu(&sdata->list, &local->interfaces);
1775         mutex_unlock(&local->iflist_mtx);
1776
1777         if (new_wdev)
1778                 *new_wdev = &sdata->wdev;
1779
1780         return 0;
1781 }
1782
1783 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1784 {
1785         ASSERT_RTNL();
1786
1787         mutex_lock(&sdata->local->iflist_mtx);
1788         list_del_rcu(&sdata->list);
1789         mutex_unlock(&sdata->local->iflist_mtx);
1790
1791         synchronize_rcu();
1792
1793         if (sdata->dev) {
1794                 unregister_netdevice(sdata->dev);
1795         } else {
1796                 cfg80211_unregister_wdev(&sdata->wdev);
1797                 kfree(sdata);
1798         }
1799 }
1800
1801 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
1802 {
1803         if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
1804                 return;
1805         ieee80211_do_stop(sdata, true);
1806         ieee80211_teardown_sdata(sdata);
1807 }
1808
1809 /*
1810  * Remove all interfaces, may only be called at hardware unregistration
1811  * time because it doesn't do RCU-safe list removals.
1812  */
1813 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1814 {
1815         struct ieee80211_sub_if_data *sdata, *tmp;
1816         LIST_HEAD(unreg_list);
1817         LIST_HEAD(wdev_list);
1818
1819         ASSERT_RTNL();
1820
1821         /*
1822          * Close all AP_VLAN interfaces first, as otherwise they
1823          * might be closed while the AP interface they belong to
1824          * is closed, causing unregister_netdevice_many() to crash.
1825          */
1826         list_for_each_entry(sdata, &local->interfaces, list)
1827                 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1828                         dev_close(sdata->dev);
1829
1830         mutex_lock(&local->iflist_mtx);
1831         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1832                 list_del(&sdata->list);
1833
1834                 if (sdata->dev)
1835                         unregister_netdevice_queue(sdata->dev, &unreg_list);
1836                 else
1837                         list_add(&sdata->list, &wdev_list);
1838         }
1839         mutex_unlock(&local->iflist_mtx);
1840         unregister_netdevice_many(&unreg_list);
1841
1842         list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
1843                 list_del(&sdata->list);
1844                 cfg80211_unregister_wdev(&sdata->wdev);
1845                 kfree(sdata);
1846         }
1847 }
1848
1849 static int netdev_notify(struct notifier_block *nb,
1850                          unsigned long state, void *ptr)
1851 {
1852         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1853         struct ieee80211_sub_if_data *sdata;
1854
1855         if (state != NETDEV_CHANGENAME)
1856                 return NOTIFY_DONE;
1857
1858         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1859                 return NOTIFY_DONE;
1860
1861         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1862                 return NOTIFY_DONE;
1863
1864         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1865         memcpy(sdata->name, dev->name, IFNAMSIZ);
1866         ieee80211_debugfs_rename_netdev(sdata);
1867
1868         return NOTIFY_OK;
1869 }
1870
1871 static struct notifier_block mac80211_netdev_notifier = {
1872         .notifier_call = netdev_notify,
1873 };
1874
1875 int ieee80211_iface_init(void)
1876 {
1877         return register_netdevice_notifier(&mac80211_netdev_notifier);
1878 }
1879
1880 void ieee80211_iface_exit(void)
1881 {
1882         unregister_netdevice_notifier(&mac80211_netdev_notifier);
1883 }