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  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13 #include <linux/slab.h>
  14 #include <linux/kernel.h>
  15 #include <linux/if_arp.h>
  16 #include <linux/netdevice.h>
  17 #include <linux/rtnetlink.h>
  18 #include <net/mac80211.h>
  19 #include <net/ieee80211_radiotap.h>
  20 #include "ieee80211_i.h"
  21 #include "sta_info.h"
  22 #include "debugfs_netdev.h"
  23 #include "mesh.h"
  24 #include "led.h"
  25 #include "driver-ops.h"
  26 #include "wme.h"
  27 #include "rate.h"
  28
  29 /**
  30  * DOC: Interface list locking
  31  *
  32  * The interface list in each struct ieee80211_local is protected
  33  * three-fold:
  34  *
  35  * (1) modifications may only be done under the RTNL
  36  * (2) modifications and readers are protected against each other by
  37  *     the iflist_mtx.
  38  * (3) modifications are done in an RCU manner so atomic readers
  39  *     can traverse the list in RCU-safe blocks.
  40  *
  41  * As a consequence, reads (traversals) of the list can be protected
  42  * by either the RTNL, the iflist_mtx or RCU.
  43  */
  44
  45 bool __ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
  46 {
  47         struct ieee80211_chanctx_conf *chanctx_conf;
  48         int power;
  49
  50         rcu_read_lock();
  51         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
  52         if (!chanctx_conf) {
  53                 rcu_read_unlock();
  54                 return false;
  55         }
  56
  57         power = ieee80211_chandef_max_power(&chanctx_conf->def);
  58         rcu_read_unlock();
  59
  60         if (sdata->user_power_level != IEEE80211_UNSET_POWER_LEVEL)
  61                 power = min(power, sdata->user_power_level);
  62
  63         if (sdata->ap_power_level != IEEE80211_UNSET_POWER_LEVEL)
  64                 power = min(power, sdata->ap_power_level);
  65
  66         if (power != sdata->vif.bss_conf.txpower) {
  67                 sdata->vif.bss_conf.txpower = power;
  68                 ieee80211_hw_config(sdata->local, 0);
  69                 return true;
  70         }
  71
  72         return false;
  73 }
  74
  75 void ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
  76 {
  77         if (__ieee80211_recalc_txpower(sdata))
  78                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_TXPOWER);
  79 }
  80
  81 static u32 __ieee80211_idle_off(struct ieee80211_local *local)
  82 {
  83         if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
  84                 return 0;
  85
  86         local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
  87         return IEEE80211_CONF_CHANGE_IDLE;
  88 }
  89
  90 static u32 __ieee80211_idle_on(struct ieee80211_local *local)
  91 {
  92         if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
  93                 return 0;
  94
  95         ieee80211_flush_queues(local, NULL);
  96
  97         local->hw.conf.flags |= IEEE80211_CONF_IDLE;
  98         return IEEE80211_CONF_CHANGE_IDLE;
  99 }
 100
 101 static u32 __ieee80211_recalc_idle(struct ieee80211_local *local,
 102                                    bool force_active)
 103 {
 104         bool working, scanning, active;
 105         unsigned int led_trig_start = 0, led_trig_stop = 0;
 106
 107         lockdep_assert_held(&local->mtx);
 108
 109         active = force_active ||
 110                  !list_empty(&local->chanctx_list) ||
 111                  local->monitors;
 112
 113         working = !local->ops->remain_on_channel &&
 114                   !list_empty(&local->roc_list);
 115
 116         scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) ||
 117                    test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning);
 118
 119         if (working || scanning)
 120                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
 121         else
 122                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
 123
 124         if (active)
 125                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
 126         else
 127                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
 128
 129         ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
 130
 131         if (working || scanning || active)
 132                 return __ieee80211_idle_off(local);
 133         return __ieee80211_idle_on(local);
 134 }
 135
 136 u32 ieee80211_idle_off(struct ieee80211_local *local)
 137 {
 138         return __ieee80211_recalc_idle(local, true);
 139 }
 140
 141 void ieee80211_recalc_idle(struct ieee80211_local *local)
 142 {
 143         u32 change = __ieee80211_recalc_idle(local, false);
 144         if (change)
 145                 ieee80211_hw_config(local, change);
 146 }
 147
 148 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
 149 {
 150         if (new_mtu < 256 || new_mtu > IEEE80211_MAX_DATA_LEN)
 151                 return -EINVAL;
 152
 153         dev->mtu = new_mtu;
 154         return 0;
 155 }
 156
 157 static int ieee80211_verify_mac(struct ieee80211_sub_if_data *sdata, u8 *addr,
 158                                 bool check_dup)
 159 {
 160         struct ieee80211_local *local = sdata->local;
 161         struct ieee80211_sub_if_data *iter;
 162         u64 new, mask, tmp;
 163         u8 *m;
 164         int ret = 0;
 165
 166         if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
 167                 return 0;
 168
 169         m = addr;
 170         new =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 171                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 172                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 173
 174         m = local->hw.wiphy->addr_mask;
 175         mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 176                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 177                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 178
 179         if (!check_dup)
 180                 return ret;
 181
 182         mutex_lock(&local->iflist_mtx);
 183         list_for_each_entry(iter, &local->interfaces, list) {
 184                 if (iter == sdata)
 185                         continue;
 186
 187                 if (iter->vif.type == NL80211_IFTYPE_MONITOR &&
 188                     !(iter->u.mntr_flags & MONITOR_FLAG_ACTIVE))
 189                         continue;
 190
 191                 m = iter->vif.addr;
 192                 tmp =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 193                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 194                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 195
 196                 if ((new & ~mask) != (tmp & ~mask)) {
 197                         ret = -EINVAL;
 198                         break;
 199                 }
 200         }
 201         mutex_unlock(&local->iflist_mtx);
 202
 203         return ret;
 204 }
 205
 206 static int ieee80211_change_mac(struct net_device *dev, void *addr)
 207 {
 208         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 209         struct sockaddr *sa = addr;
 210         bool check_dup = true;
 211         int ret;
 212
 213         if (ieee80211_sdata_running(sdata))
 214                 return -EBUSY;
 215
 216         if (sdata->vif.type == NL80211_IFTYPE_MONITOR &&
 217             !(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE))
 218                 check_dup = false;
 219
 220         ret = ieee80211_verify_mac(sdata, sa->sa_data, check_dup);
 221         if (ret)
 222                 return ret;
 223
 224         ret = eth_mac_addr(dev, sa);
 225
 226         if (ret == 0)
 227                 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
 228
 229         return ret;
 230 }
 231
 232 static inline int identical_mac_addr_allowed(int type1, int type2)
 233 {
 234         return type1 == NL80211_IFTYPE_MONITOR ||
 235                 type2 == NL80211_IFTYPE_MONITOR ||
 236                 type1 == NL80211_IFTYPE_P2P_DEVICE ||
 237                 type2 == NL80211_IFTYPE_P2P_DEVICE ||
 238                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
 239                 (type1 == NL80211_IFTYPE_WDS &&
 240                         (type2 == NL80211_IFTYPE_WDS ||
 241                          type2 == NL80211_IFTYPE_AP)) ||
 242                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
 243                 (type1 == NL80211_IFTYPE_AP_VLAN &&
 244                         (type2 == NL80211_IFTYPE_AP ||
 245                          type2 == NL80211_IFTYPE_AP_VLAN));
 246 }
 247
 248 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
 249                                             enum nl80211_iftype iftype)
 250 {
 251         struct ieee80211_local *local = sdata->local;
 252         struct ieee80211_sub_if_data *nsdata;
 253         int ret;
 254
 255         ASSERT_RTNL();
 256
 257         /* we hold the RTNL here so can safely walk the list */
 258         list_for_each_entry(nsdata, &local->interfaces, list) {
 259                 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
 260                         /*
 261                          * Allow only a single IBSS interface to be up at any
 262                          * time. This is restricted because beacon distribution
 263                          * cannot work properly if both are in the same IBSS.
 264                          *
 265                          * To remove this restriction we'd have to disallow them
 266                          * from setting the same SSID on different IBSS interfaces
 267                          * belonging to the same hardware. Then, however, we're
 268                          * faced with having to adopt two different TSF timers...
 269                          */
 270                         if (iftype == NL80211_IFTYPE_ADHOC &&
 271                             nsdata->vif.type == NL80211_IFTYPE_ADHOC)
 272                                 return -EBUSY;
 273                         /*
 274                          * will not add another interface while any channel
 275                          * switch is active.
 276                          */
 277                         if (nsdata->vif.csa_active)
 278                                 return -EBUSY;
 279
 280                         /*
 281                          * The remaining checks are only performed for interfaces
 282                          * with the same MAC address.
 283                          */
 284                         if (!ether_addr_equal(sdata->vif.addr,
 285                                               nsdata->vif.addr))
 286                                 continue;
 287
 288                         /*
 289                          * check whether it may have the same address
 290                          */
 291                         if (!identical_mac_addr_allowed(iftype,
 292                                                         nsdata->vif.type))
 293                                 return -ENOTUNIQ;
 294
 295                         /*
 296                          * can only add VLANs to enabled APs
 297                          */
 298                         if (iftype == NL80211_IFTYPE_AP_VLAN &&
 299                             nsdata->vif.type == NL80211_IFTYPE_AP)
 300                                 sdata->bss = &nsdata->u.ap;
 301                 }
 302         }
 303
 304         mutex_lock(&local->chanctx_mtx);
 305         ret = ieee80211_check_combinations(sdata, NULL, 0, 0);
 306         mutex_unlock(&local->chanctx_mtx);
 307         return ret;
 308 }
 309
 310 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata,
 311                                   enum nl80211_iftype iftype)
 312 {
 313         int n_queues = sdata->local->hw.queues;
 314         int i;
 315
 316         if (iftype != NL80211_IFTYPE_P2P_DEVICE) {
 317                 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 318                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
 319                                          IEEE80211_INVAL_HW_QUEUE))
 320                                 return -EINVAL;
 321                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
 322                                          n_queues))
 323                                 return -EINVAL;
 324                 }
 325         }
 326
 327         if ((iftype != NL80211_IFTYPE_AP &&
 328              iftype != NL80211_IFTYPE_P2P_GO &&
 329              iftype != NL80211_IFTYPE_MESH_POINT) ||
 330             !(sdata->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)) {
 331                 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
 332                 return 0;
 333         }
 334
 335         if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
 336                 return -EINVAL;
 337
 338         if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
 339                 return -EINVAL;
 340
 341         return 0;
 342 }
 343
 344 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
 345                                     const int offset)
 346 {
 347         struct ieee80211_local *local = sdata->local;
 348         u32 flags = sdata->u.mntr_flags;
 349
 350 #define ADJUST(_f, _s)  do {                                    \
 351         if (flags & MONITOR_FLAG_##_f)                          \
 352                 local->fif_##_s += offset;                      \
 353         } while (0)
 354
 355         ADJUST(FCSFAIL, fcsfail);
 356         ADJUST(PLCPFAIL, plcpfail);
 357         ADJUST(CONTROL, control);
 358         ADJUST(CONTROL, pspoll);
 359         ADJUST(OTHER_BSS, other_bss);
 360
 361 #undef ADJUST
 362 }
 363
 364 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
 365 {
 366         struct ieee80211_local *local = sdata->local;
 367         int i;
 368
 369         for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 370                 if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
 371                         sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
 372                 else if (local->hw.queues >= IEEE80211_NUM_ACS)
 373                         sdata->vif.hw_queue[i] = i;
 374                 else
 375                         sdata->vif.hw_queue[i] = 0;
 376         }
 377         sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
 378 }
 379
 380 int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
 381 {
 382         struct ieee80211_sub_if_data *sdata;
 383         int ret;
 384
 385         if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
 386                 return 0;
 387
 388         ASSERT_RTNL();
 389
 390         if (local->monitor_sdata)
 391                 return 0;
 392
 393         sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
 394         if (!sdata)
 395                 return -ENOMEM;
 396
 397         /* set up data */
 398         sdata->local = local;
 399         sdata->vif.type = NL80211_IFTYPE_MONITOR;
 400         snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
 401                  wiphy_name(local->hw.wiphy));
 402
 403         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
 404
 405         ieee80211_set_default_queues(sdata);
 406
 407         ret = drv_add_interface(local, sdata);
 408         if (WARN_ON(ret)) {
 409                 /* ok .. stupid driver, it asked for this! */
 410                 kfree(sdata);
 411                 return ret;
 412         }
 413
 414         ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR);
 415         if (ret) {
 416                 kfree(sdata);
 417                 return ret;
 418         }
 419
 420         mutex_lock(&local->iflist_mtx);
 421         rcu_assign_pointer(local->monitor_sdata, sdata);
 422         mutex_unlock(&local->iflist_mtx);
 423
 424         mutex_lock(&local->mtx);
 425         ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef,
 426                                         IEEE80211_CHANCTX_EXCLUSIVE);
 427         mutex_unlock(&local->mtx);
 428         if (ret) {
 429                 mutex_lock(&local->iflist_mtx);
 430                 RCU_INIT_POINTER(local->monitor_sdata, NULL);
 431                 mutex_unlock(&local->iflist_mtx);
 432                 synchronize_net();
 433                 drv_remove_interface(local, sdata);
 434                 kfree(sdata);
 435                 return ret;
 436         }
 437
 438         return 0;
 439 }
 440
 441 void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
 442 {
 443         struct ieee80211_sub_if_data *sdata;
 444
 445         if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
 446                 return;
 447
 448         ASSERT_RTNL();
 449
 450         mutex_lock(&local->iflist_mtx);
 451
 452         sdata = rcu_dereference_protected(local->monitor_sdata,
 453                                           lockdep_is_held(&local->iflist_mtx));
 454         if (!sdata) {
 455                 mutex_unlock(&local->iflist_mtx);
 456                 return;
 457         }
 458
 459         RCU_INIT_POINTER(local->monitor_sdata, NULL);
 460         mutex_unlock(&local->iflist_mtx);
 461
 462         synchronize_net();
 463
 464         mutex_lock(&local->mtx);
 465         ieee80211_vif_release_channel(sdata);
 466         mutex_unlock(&local->mtx);
 467
 468         drv_remove_interface(local, sdata);
 469
 470         kfree(sdata);
 471 }
 472
 473 /*
 474  * NOTE: Be very careful when changing this function, it must NOT return
 475  * an error on interface type changes that have been pre-checked, so most
 476  * checks should be in ieee80211_check_concurrent_iface.
 477  */
 478 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
 479 {
 480         struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
 481         struct net_device *dev = wdev->netdev;
 482         struct ieee80211_local *local = sdata->local;
 483         struct sta_info *sta;
 484         u32 changed = 0;
 485         int res;
 486         u32 hw_reconf_flags = 0;
 487
 488         switch (sdata->vif.type) {
 489         case NL80211_IFTYPE_WDS:
 490                 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
 491                         return -ENOLINK;
 492                 break;
 493         case NL80211_IFTYPE_AP_VLAN: {
 494                 struct ieee80211_sub_if_data *master;
 495
 496                 if (!sdata->bss)
 497                         return -ENOLINK;
 498
 499                 mutex_lock(&local->mtx);
 500                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
 501                 mutex_unlock(&local->mtx);
 502
 503                 master = container_of(sdata->bss,
 504                                       struct ieee80211_sub_if_data, u.ap);
 505                 sdata->control_port_protocol =
 506                         master->control_port_protocol;
 507                 sdata->control_port_no_encrypt =
 508                         master->control_port_no_encrypt;
 509                 sdata->vif.cab_queue = master->vif.cab_queue;
 510                 memcpy(sdata->vif.hw_queue, master->vif.hw_queue,
 511                        sizeof(sdata->vif.hw_queue));
 512                 break;
 513                 }
 514         case NL80211_IFTYPE_AP:
 515                 sdata->bss = &sdata->u.ap;
 516                 break;
 517         case NL80211_IFTYPE_MESH_POINT:
 518         case NL80211_IFTYPE_STATION:
 519         case NL80211_IFTYPE_MONITOR:
 520         case NL80211_IFTYPE_ADHOC:
 521         case NL80211_IFTYPE_P2P_DEVICE:
 522                 /* no special treatment */
 523                 break;
 524         case NL80211_IFTYPE_UNSPECIFIED:
 525         case NUM_NL80211_IFTYPES:
 526         case NL80211_IFTYPE_P2P_CLIENT:
 527         case NL80211_IFTYPE_P2P_GO:
 528                 /* cannot happen */
 529                 WARN_ON(1);
 530                 break;
 531         }
 532
 533         if (local->open_count == 0) {
 534                 res = drv_start(local);
 535                 if (res)
 536                         goto err_del_bss;
 537                 /* we're brought up, everything changes */
 538                 hw_reconf_flags = ~0;
 539                 ieee80211_led_radio(local, true);
 540                 ieee80211_mod_tpt_led_trig(local,
 541                                            IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
 542         }
 543
 544         /*
 545          * Copy the hopefully now-present MAC address to
 546          * this interface, if it has the special null one.
 547          */
 548         if (dev && is_zero_ether_addr(dev->dev_addr)) {
 549                 memcpy(dev->dev_addr,
 550                        local->hw.wiphy->perm_addr,
 551                        ETH_ALEN);
 552                 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
 553
 554                 if (!is_valid_ether_addr(dev->dev_addr)) {
 555                         res = -EADDRNOTAVAIL;
 556                         goto err_stop;
 557                 }
 558         }
 559
 560         switch (sdata->vif.type) {
 561         case NL80211_IFTYPE_AP_VLAN:
 562                 /* no need to tell driver, but set carrier and chanctx */
 563                 if (rtnl_dereference(sdata->bss->beacon)) {
 564                         ieee80211_vif_vlan_copy_chanctx(sdata);
 565                         netif_carrier_on(dev);
 566                 } else {
 567                         netif_carrier_off(dev);
 568                 }
 569                 break;
 570         case NL80211_IFTYPE_MONITOR:
 571                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 572                         local->cooked_mntrs++;
 573                         break;
 574                 }
 575
 576                 if (sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE) {
 577                         res = drv_add_interface(local, sdata);
 578                         if (res)
 579                                 goto err_stop;
 580                 } else if (local->monitors == 0 && local->open_count == 0) {
 581                         res = ieee80211_add_virtual_monitor(local);
 582                         if (res)
 583                                 goto err_stop;
 584                 }
 585
 586                 /* must be before the call to ieee80211_configure_filter */
 587                 local->monitors++;
 588                 if (local->monitors == 1) {
 589                         local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
 590                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 591                 }
 592
 593                 ieee80211_adjust_monitor_flags(sdata, 1);
 594                 ieee80211_configure_filter(local);
 595                 mutex_lock(&local->mtx);
 596                 ieee80211_recalc_idle(local);
 597                 mutex_unlock(&local->mtx);
 598
 599                 netif_carrier_on(dev);
 600                 break;
 601         default:
 602                 if (coming_up) {
 603                         ieee80211_del_virtual_monitor(local);
 604
 605                         res = drv_add_interface(local, sdata);
 606                         if (res)
 607                                 goto err_stop;
 608                         res = ieee80211_check_queues(sdata,
 609                                 ieee80211_vif_type_p2p(&sdata->vif));
 610                         if (res)
 611                                 goto err_del_interface;
 612                 }
 613
 614                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
 615                         local->fif_pspoll++;
 616                         local->fif_probe_req++;
 617
 618                         ieee80211_configure_filter(local);
 619                 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 620                         local->fif_probe_req++;
 621                 }
 622
 623                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
 624                         changed |= ieee80211_reset_erp_info(sdata);
 625                 ieee80211_bss_info_change_notify(sdata, changed);
 626
 627                 switch (sdata->vif.type) {
 628                 case NL80211_IFTYPE_STATION:
 629                 case NL80211_IFTYPE_ADHOC:
 630                 case NL80211_IFTYPE_AP:
 631                 case NL80211_IFTYPE_MESH_POINT:
 632                         netif_carrier_off(dev);
 633                         break;
 634                 case NL80211_IFTYPE_WDS:
 635                 case NL80211_IFTYPE_P2P_DEVICE:
 636                         break;
 637                 default:
 638                         /* not reached */
 639                         WARN_ON(1);
 640                 }
 641
 642                 /*
 643                  * set default queue parameters so drivers don't
 644                  * need to initialise the hardware if the hardware
 645                  * doesn't start up with sane defaults
 646                  */
 647                 ieee80211_set_wmm_default(sdata, true);
 648         }
 649
 650         set_bit(SDATA_STATE_RUNNING, &sdata->state);
 651
 652         if (sdata->vif.type == NL80211_IFTYPE_WDS) {
 653                 /* Create STA entry for the WDS peer */
 654                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
 655                                      GFP_KERNEL);
 656                 if (!sta) {
 657                         res = -ENOMEM;
 658                         goto err_del_interface;
 659                 }
 660
 661                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
 662                 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
 663                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
 664
 665                 res = sta_info_insert(sta);
 666                 if (res) {
 667                         /* STA has been freed */
 668                         goto err_del_interface;
 669                 }
 670
 671                 rate_control_rate_init(sta);
 672                 netif_carrier_on(dev);
 673         } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
 674                 rcu_assign_pointer(local->p2p_sdata, sdata);
 675         }
 676
 677         /*
 678          * set_multicast_list will be invoked by the networking core
 679          * which will check whether any increments here were done in
 680          * error and sync them down to the hardware as filter flags.
 681          */
 682         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 683                 atomic_inc(&local->iff_allmultis);
 684
 685         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 686                 atomic_inc(&local->iff_promiscs);
 687
 688         if (coming_up)
 689                 local->open_count++;
 690
 691         if (hw_reconf_flags)
 692                 ieee80211_hw_config(local, hw_reconf_flags);
 693
 694         ieee80211_recalc_ps(local, -1);
 695
 696         if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
 697             sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 698                 /* XXX: for AP_VLAN, actually track AP queues */
 699                 netif_tx_start_all_queues(dev);
 700         } else if (dev) {
 701                 unsigned long flags;
 702                 int n_acs = IEEE80211_NUM_ACS;
 703                 int ac;
 704
 705                 if (local->hw.queues < IEEE80211_NUM_ACS)
 706                         n_acs = 1;
 707
 708                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 709                 if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE ||
 710                     (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 &&
 711                      skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) {
 712                         for (ac = 0; ac < n_acs; ac++) {
 713                                 int ac_queue = sdata->vif.hw_queue[ac];
 714
 715                                 if (local->queue_stop_reasons[ac_queue] == 0 &&
 716                                     skb_queue_empty(&local->pending[ac_queue]))
 717                                         netif_start_subqueue(dev, ac);
 718                         }
 719                 }
 720                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 721         }
 722
 723         return 0;
 724  err_del_interface:
 725         drv_remove_interface(local, sdata);
 726  err_stop:
 727         if (!local->open_count)
 728                 drv_stop(local);
 729  err_del_bss:
 730         sdata->bss = NULL;
 731         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 732                 mutex_lock(&local->mtx);
 733                 list_del(&sdata->u.vlan.list);
 734                 mutex_unlock(&local->mtx);
 735         }
 736         /* might already be clear but that doesn't matter */
 737         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 738         return res;
 739 }
 740
 741 static int ieee80211_open(struct net_device *dev)
 742 {
 743         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 744         int err;
 745
 746         /* fail early if user set an invalid address */
 747         if (!is_valid_ether_addr(dev->dev_addr))
 748                 return -EADDRNOTAVAIL;
 749
 750         err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
 751         if (err)
 752                 return err;
 753
 754         return ieee80211_do_open(&sdata->wdev, true);
 755 }
 756
 757 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
 758                               bool going_down)
 759 {
 760         struct ieee80211_local *local = sdata->local;
 761         unsigned long flags;
 762         struct sk_buff *skb, *tmp;
 763         u32 hw_reconf_flags = 0;
 764         int i, flushed;
 765         struct ps_data *ps;
 766         struct cfg80211_chan_def chandef;
 767
 768         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 769
 770         if (rcu_access_pointer(local->scan_sdata) == sdata)
 771                 ieee80211_scan_cancel(local);
 772
 773         /*
 774          * Stop TX on this interface first.
 775          */
 776         if (sdata->dev)
 777                 netif_tx_stop_all_queues(sdata->dev);
 778
 779         ieee80211_roc_purge(local, sdata);
 780
 781         switch (sdata->vif.type) {
 782         case NL80211_IFTYPE_STATION:
 783                 ieee80211_mgd_stop(sdata);
 784                 break;
 785         case NL80211_IFTYPE_ADHOC:
 786                 ieee80211_ibss_stop(sdata);
 787                 break;
 788         case NL80211_IFTYPE_AP:
 789                 cancel_work_sync(&sdata->u.ap.request_smps_work);
 790                 break;
 791         default:
 792                 break;
 793         }
 794
 795         /*
 796          * Remove all stations associated with this interface.
 797          *
 798          * This must be done before calling ops->remove_interface()
 799          * because otherwise we can later invoke ops->sta_notify()
 800          * whenever the STAs are removed, and that invalidates driver
 801          * assumptions about always getting a vif pointer that is valid
 802          * (because if we remove a STA after ops->remove_interface()
 803          * the driver will have removed the vif info already!)
 804          *
 805          * This is relevant only in WDS mode, in all other modes we've
 806          * already removed all stations when disconnecting or similar,
 807          * so warn otherwise.
 808          */
 809         flushed = sta_info_flush(sdata);
 810         WARN_ON_ONCE((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) ||
 811                      (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1));
 812
 813         /* don't count this interface for promisc/allmulti while it is down */
 814         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 815                 atomic_dec(&local->iff_allmultis);
 816
 817         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 818                 atomic_dec(&local->iff_promiscs);
 819
 820         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 821                 local->fif_pspoll--;
 822                 local->fif_probe_req--;
 823         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 824                 local->fif_probe_req--;
 825         }
 826
 827         if (sdata->dev) {
 828                 netif_addr_lock_bh(sdata->dev);
 829                 spin_lock_bh(&local->filter_lock);
 830                 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
 831                                  sdata->dev->addr_len);
 832                 spin_unlock_bh(&local->filter_lock);
 833                 netif_addr_unlock_bh(sdata->dev);
 834         }
 835
 836         del_timer_sync(&local->dynamic_ps_timer);
 837         cancel_work_sync(&local->dynamic_ps_enable_work);
 838
 839         cancel_work_sync(&sdata->recalc_smps);
 840         sdata_lock(sdata);
 841         sdata->vif.csa_active = false;
 842         sdata_unlock(sdata);
 843         cancel_work_sync(&sdata->csa_finalize_work);
 844
 845         cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
 846
 847         if (sdata->wdev.cac_started) {
 848                 chandef = sdata->vif.bss_conf.chandef;
 849                 WARN_ON(local->suspended);
 850                 mutex_lock(&local->mtx);
 851                 ieee80211_vif_release_channel(sdata);
 852                 mutex_unlock(&local->mtx);
 853                 cfg80211_cac_event(sdata->dev, &chandef,
 854                                    NL80211_RADAR_CAC_ABORTED,
 855                                    GFP_KERNEL);
 856         }
 857
 858         /* APs need special treatment */
 859         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 860                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
 861
 862                 /* down all dependent devices, that is VLANs */
 863                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
 864                                          u.vlan.list)
 865                         dev_close(vlan->dev);
 866                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
 867         } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 868                 /* remove all packets in parent bc_buf pointing to this dev */
 869                 ps = &sdata->bss->ps;
 870
 871                 spin_lock_irqsave(&ps->bc_buf.lock, flags);
 872                 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
 873                         if (skb->dev == sdata->dev) {
 874                                 __skb_unlink(skb, &ps->bc_buf);
 875                                 local->total_ps_buffered--;
 876                                 ieee80211_free_txskb(&local->hw, skb);
 877                         }
 878                 }
 879                 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
 880         }
 881
 882         if (going_down)
 883                 local->open_count--;
 884
 885         switch (sdata->vif.type) {
 886         case NL80211_IFTYPE_AP_VLAN:
 887                 mutex_lock(&local->mtx);
 888                 list_del(&sdata->u.vlan.list);
 889                 mutex_unlock(&local->mtx);
 890                 RCU_INIT_POINTER(sdata->vif.chanctx_conf, NULL);
 891                 /* no need to tell driver */
 892                 break;
 893         case NL80211_IFTYPE_MONITOR:
 894                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 895                         local->cooked_mntrs--;
 896                         break;
 897                 }
 898
 899                 local->monitors--;
 900                 if (local->monitors == 0) {
 901                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
 902                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 903                 }
 904
 905                 ieee80211_adjust_monitor_flags(sdata, -1);
 906                 break;
 907         case NL80211_IFTYPE_P2P_DEVICE:
 908                 /* relies on synchronize_rcu() below */
 909                 RCU_INIT_POINTER(local->p2p_sdata, NULL);
 910                 /* fall through */
 911         default:
 912                 cancel_work_sync(&sdata->work);
 913                 /*
 914                  * When we get here, the interface is marked down.
 915                  * Free the remaining keys, if there are any
 916                  * (shouldn't be, except maybe in WDS mode?)
 917                  *
 918                  * Force the key freeing to always synchronize_net()
 919                  * to wait for the RX path in case it is using this
 920                  * interface enqueuing frames * at this very time on
 921                  * another CPU.
 922                  */
 923                 ieee80211_free_keys(sdata, true);
 924
 925                 /* fall through */
 926         case NL80211_IFTYPE_AP:
 927                 skb_queue_purge(&sdata->skb_queue);
 928         }
 929
 930         sdata->bss = NULL;
 931
 932         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 933         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 934                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
 935                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 936                         if (info->control.vif == &sdata->vif) {
 937                                 __skb_unlink(skb, &local->pending[i]);
 938                                 ieee80211_free_txskb(&local->hw, skb);
 939                         }
 940                 }
 941         }
 942         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 943
 944         if (local->open_count == 0)
 945                 ieee80211_clear_tx_pending(local);
 946
 947         /*
 948          * If the interface goes down while suspended, presumably because
 949          * the device was unplugged and that happens before our resume,
 950          * then the driver is already unconfigured and the remainder of
 951          * this function isn't needed.
 952          * XXX: what about WoWLAN? If the device has software state, e.g.
 953          *      memory allocated, it might expect teardown commands from
 954          *      mac80211 here?
 955          */
 956         if (local->suspended) {
 957                 WARN_ON(local->wowlan);
 958                 WARN_ON(rtnl_dereference(local->monitor_sdata));
 959                 return;
 960         }
 961
 962         switch (sdata->vif.type) {
 963         case NL80211_IFTYPE_AP_VLAN:
 964                 break;
 965         case NL80211_IFTYPE_MONITOR:
 966                 if (local->monitors == 0)
 967                         ieee80211_del_virtual_monitor(local);
 968
 969                 mutex_lock(&local->mtx);
 970                 ieee80211_recalc_idle(local);
 971                 mutex_unlock(&local->mtx);
 972
 973                 if (!(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE))
 974                         break;
 975
 976                 /* fall through */
 977         default:
 978                 if (going_down)
 979                         drv_remove_interface(local, sdata);
 980         }
 981
 982         ieee80211_recalc_ps(local, -1);
 983
 984         if (local->open_count == 0) {
 985                 ieee80211_stop_device(local);
 986
 987                 /* no reconfiguring after stop! */
 988                 return;
 989         }
 990
 991         /* do after stop to avoid reconfiguring when we stop anyway */
 992         ieee80211_configure_filter(local);
 993         ieee80211_hw_config(local, hw_reconf_flags);
 994
 995         if (local->monitors == local->open_count)
 996                 ieee80211_add_virtual_monitor(local);
 997 }
 998
 999 static int ieee80211_stop(struct net_device *dev)
1000 {
1001         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1002
1003         ieee80211_do_stop(sdata, true);
1004
1005         return 0;
1006 }
1007
1008 static void ieee80211_set_multicast_list(struct net_device *dev)
1009 {
1010         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1011         struct ieee80211_local *local = sdata->local;
1012         int allmulti, promisc, sdata_allmulti, sdata_promisc;
1013
1014         allmulti = !!(dev->flags & IFF_ALLMULTI);
1015         promisc = !!(dev->flags & IFF_PROMISC);
1016         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
1017         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
1018
1019         if (allmulti != sdata_allmulti) {
1020                 if (dev->flags & IFF_ALLMULTI)
1021                         atomic_inc(&local->iff_allmultis);
1022                 else
1023                         atomic_dec(&local->iff_allmultis);
1024                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
1025         }
1026
1027         if (promisc != sdata_promisc) {
1028                 if (dev->flags & IFF_PROMISC)
1029                         atomic_inc(&local->iff_promiscs);
1030                 else
1031                         atomic_dec(&local->iff_promiscs);
1032                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
1033         }
1034         spin_lock_bh(&local->filter_lock);
1035         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
1036         spin_unlock_bh(&local->filter_lock);
1037         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
1038 }
1039
1040 /*
1041  * Called when the netdev is removed or, by the code below, before
1042  * the interface type changes.
1043  */
1044 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
1045 {
1046         int i;
1047
1048         /* free extra data */
1049         ieee80211_free_keys(sdata, false);
1050
1051         ieee80211_debugfs_remove_netdev(sdata);
1052
1053         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1054                 __skb_queue_purge(&sdata->fragments[i].skb_list);
1055         sdata->fragment_next = 0;
1056
1057         if (ieee80211_vif_is_mesh(&sdata->vif))
1058                 mesh_rmc_free(sdata);
1059 }
1060
1061 static void ieee80211_uninit(struct net_device *dev)
1062 {
1063         ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
1064 }
1065
1066 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
1067                                          struct sk_buff *skb,
1068                                          void *accel_priv,
1069                                          select_queue_fallback_t fallback)
1070 {
1071         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
1072 }
1073
1074 static const struct net_device_ops ieee80211_dataif_ops = {
1075         .ndo_open               = ieee80211_open,
1076         .ndo_stop               = ieee80211_stop,
1077         .ndo_uninit             = ieee80211_uninit,
1078         .ndo_start_xmit         = ieee80211_subif_start_xmit,
1079         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1080         .ndo_change_mtu         = ieee80211_change_mtu,
1081         .ndo_set_mac_address    = ieee80211_change_mac,
1082         .ndo_select_queue       = ieee80211_netdev_select_queue,
1083 };
1084
1085 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
1086                                           struct sk_buff *skb,
1087                                           void *accel_priv,
1088                                           select_queue_fallback_t fallback)
1089 {
1090         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1091         struct ieee80211_local *local = sdata->local;
1092         struct ieee80211_hdr *hdr;
1093         struct ieee80211_radiotap_header *rtap = (void *)skb->data;
1094
1095         if (local->hw.queues < IEEE80211_NUM_ACS)
1096                 return 0;
1097
1098         if (skb->len < 4 ||
1099             skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
1100                 return 0; /* doesn't matter, frame will be dropped */
1101
1102         hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
1103
1104         return ieee80211_select_queue_80211(sdata, skb, hdr);
1105 }
1106
1107 static const struct net_device_ops ieee80211_monitorif_ops = {
1108         .ndo_open               = ieee80211_open,
1109         .ndo_stop               = ieee80211_stop,
1110         .ndo_uninit             = ieee80211_uninit,
1111         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
1112         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1113         .ndo_change_mtu         = ieee80211_change_mtu,
1114         .ndo_set_mac_address    = ieee80211_change_mac,
1115         .ndo_select_queue       = ieee80211_monitor_select_queue,
1116 };
1117
1118 static void ieee80211_if_setup(struct net_device *dev)
1119 {
1120         ether_setup(dev);
1121         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1122         dev->netdev_ops = &ieee80211_dataif_ops;
1123         dev->destructor = free_netdev;
1124 }
1125
1126 static void ieee80211_iface_work(struct work_struct *work)
1127 {
1128         struct ieee80211_sub_if_data *sdata =
1129                 container_of(work, struct ieee80211_sub_if_data, work);
1130         struct ieee80211_local *local = sdata->local;
1131         struct sk_buff *skb;
1132         struct sta_info *sta;
1133         struct ieee80211_ra_tid *ra_tid;
1134
1135         if (!ieee80211_sdata_running(sdata))
1136                 return;
1137
1138         if (local->scanning)
1139                 return;
1140
1141         /*
1142          * ieee80211_queue_work() should have picked up most cases,
1143          * here we'll pick the rest.
1144          */
1145         if (WARN(local->suspended,
1146                  "interface work scheduled while going to suspend\n"))
1147                 return;
1148
1149         /* first process frames */
1150         while ((skb = skb_dequeue(&sdata->skb_queue))) {
1151                 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1152
1153                 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
1154                         ra_tid = (void *)&skb->cb;
1155                         ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
1156                                                  ra_tid->tid);
1157                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
1158                         ra_tid = (void *)&skb->cb;
1159                         ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
1160                                                 ra_tid->tid);
1161                 } else if (ieee80211_is_action(mgmt->frame_control) &&
1162                            mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1163                         int len = skb->len;
1164
1165                         mutex_lock(&local->sta_mtx);
1166                         sta = sta_info_get_bss(sdata, mgmt->sa);
1167                         if (sta) {
1168                                 switch (mgmt->u.action.u.addba_req.action_code) {
1169                                 case WLAN_ACTION_ADDBA_REQ:
1170                                         ieee80211_process_addba_request(
1171                                                         local, sta, mgmt, len);
1172                                         break;
1173                                 case WLAN_ACTION_ADDBA_RESP:
1174                                         ieee80211_process_addba_resp(local, sta,
1175                                                                      mgmt, len);
1176                                         break;
1177                                 case WLAN_ACTION_DELBA:
1178                                         ieee80211_process_delba(sdata, sta,
1179                                                                 mgmt, len);
1180                                         break;
1181                                 default:
1182                                         WARN_ON(1);
1183                                         break;
1184                                 }
1185                         }
1186                         mutex_unlock(&local->sta_mtx);
1187                 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1188                         struct ieee80211_hdr *hdr = (void *)mgmt;
1189                         /*
1190                          * So the frame isn't mgmt, but frame_control
1191                          * is at the right place anyway, of course, so
1192                          * the if statement is correct.
1193                          *
1194                          * Warn if we have other data frame types here,
1195                          * they must not get here.
1196                          */
1197                         WARN_ON(hdr->frame_control &
1198                                         cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1199                         WARN_ON(!(hdr->seq_ctrl &
1200                                         cpu_to_le16(IEEE80211_SCTL_FRAG)));
1201                         /*
1202                          * This was a fragment of a frame, received while
1203                          * a block-ack session was active. That cannot be
1204                          * right, so terminate the session.
1205                          */
1206                         mutex_lock(&local->sta_mtx);
1207                         sta = sta_info_get_bss(sdata, mgmt->sa);
1208                         if (sta) {
1209                                 u16 tid = *ieee80211_get_qos_ctl(hdr) &
1210                                                 IEEE80211_QOS_CTL_TID_MASK;
1211
1212                                 __ieee80211_stop_rx_ba_session(
1213                                         sta, tid, WLAN_BACK_RECIPIENT,
1214                                         WLAN_REASON_QSTA_REQUIRE_SETUP,
1215                                         true);
1216                         }
1217                         mutex_unlock(&local->sta_mtx);
1218                 } else switch (sdata->vif.type) {
1219                 case NL80211_IFTYPE_STATION:
1220                         ieee80211_sta_rx_queued_mgmt(sdata, skb);
1221                         break;
1222                 case NL80211_IFTYPE_ADHOC:
1223                         ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1224                         break;
1225                 case NL80211_IFTYPE_MESH_POINT:
1226                         if (!ieee80211_vif_is_mesh(&sdata->vif))
1227                                 break;
1228                         ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1229                         break;
1230                 default:
1231                         WARN(1, "frame for unexpected interface type");
1232                         break;
1233                 }
1234
1235                 kfree_skb(skb);
1236         }
1237
1238         /* then other type-dependent work */
1239         switch (sdata->vif.type) {
1240         case NL80211_IFTYPE_STATION:
1241                 ieee80211_sta_work(sdata);
1242                 break;
1243         case NL80211_IFTYPE_ADHOC:
1244                 ieee80211_ibss_work(sdata);
1245                 break;
1246         case NL80211_IFTYPE_MESH_POINT:
1247                 if (!ieee80211_vif_is_mesh(&sdata->vif))
1248                         break;
1249                 ieee80211_mesh_work(sdata);
1250                 break;
1251         default:
1252                 break;
1253         }
1254 }
1255
1256 static void ieee80211_recalc_smps_work(struct work_struct *work)
1257 {
1258         struct ieee80211_sub_if_data *sdata =
1259                 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1260
1261         ieee80211_recalc_smps(sdata);
1262 }
1263
1264 /*
1265  * Helper function to initialise an interface to a specific type.
1266  */
1267 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1268                                   enum nl80211_iftype type)
1269 {
1270         /* clear type-dependent union */
1271         memset(&sdata->u, 0, sizeof(sdata->u));
1272
1273         /* and set some type-dependent values */
1274         sdata->vif.type = type;
1275         sdata->vif.p2p = false;
1276         sdata->wdev.iftype = type;
1277
1278         sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1279         sdata->control_port_no_encrypt = false;
1280         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1281
1282         sdata->noack_map = 0;
1283
1284         /* only monitor/p2p-device differ */
1285         if (sdata->dev) {
1286                 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1287                 sdata->dev->type = ARPHRD_ETHER;
1288         }
1289
1290         skb_queue_head_init(&sdata->skb_queue);
1291         INIT_WORK(&sdata->work, ieee80211_iface_work);
1292         INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1293         INIT_WORK(&sdata->csa_finalize_work, ieee80211_csa_finalize_work);
1294         INIT_LIST_HEAD(&sdata->assigned_chanctx_list);
1295         INIT_LIST_HEAD(&sdata->reserved_chanctx_list);
1296
1297         switch (type) {
1298         case NL80211_IFTYPE_P2P_GO:
1299                 type = NL80211_IFTYPE_AP;
1300                 sdata->vif.type = type;
1301                 sdata->vif.p2p = true;
1302                 /* fall through */
1303         case NL80211_IFTYPE_AP:
1304                 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1305                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1306                 INIT_WORK(&sdata->u.ap.request_smps_work,
1307                           ieee80211_request_smps_ap_work);
1308                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1309                 sdata->u.ap.req_smps = IEEE80211_SMPS_OFF;
1310                 break;
1311         case NL80211_IFTYPE_P2P_CLIENT:
1312                 type = NL80211_IFTYPE_STATION;
1313                 sdata->vif.type = type;
1314                 sdata->vif.p2p = true;
1315                 /* fall through */
1316         case NL80211_IFTYPE_STATION:
1317                 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1318                 ieee80211_sta_setup_sdata(sdata);
1319                 break;
1320         case NL80211_IFTYPE_ADHOC:
1321                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1322                 ieee80211_ibss_setup_sdata(sdata);
1323                 break;
1324         case NL80211_IFTYPE_MESH_POINT:
1325                 if (ieee80211_vif_is_mesh(&sdata->vif))
1326                         ieee80211_mesh_init_sdata(sdata);
1327                 break;
1328         case NL80211_IFTYPE_MONITOR:
1329                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1330                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1331                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
1332                                       MONITOR_FLAG_OTHER_BSS;
1333                 break;
1334         case NL80211_IFTYPE_WDS:
1335                 sdata->vif.bss_conf.bssid = NULL;
1336                 break;
1337         case NL80211_IFTYPE_AP_VLAN:
1338         case NL80211_IFTYPE_P2P_DEVICE:
1339                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1340                 break;
1341         case NL80211_IFTYPE_UNSPECIFIED:
1342         case NUM_NL80211_IFTYPES:
1343                 BUG();
1344                 break;
1345         }
1346
1347         ieee80211_debugfs_add_netdev(sdata);
1348 }
1349
1350 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1351                                            enum nl80211_iftype type)
1352 {
1353         struct ieee80211_local *local = sdata->local;
1354         int ret, err;
1355         enum nl80211_iftype internal_type = type;
1356         bool p2p = false;
1357
1358         ASSERT_RTNL();
1359
1360         if (!local->ops->change_interface)
1361                 return -EBUSY;
1362
1363         switch (sdata->vif.type) {
1364         case NL80211_IFTYPE_AP:
1365         case NL80211_IFTYPE_STATION:
1366         case NL80211_IFTYPE_ADHOC:
1367                 /*
1368                  * Could maybe also all others here?
1369                  * Just not sure how that interacts
1370                  * with the RX/config path e.g. for
1371                  * mesh.
1372                  */
1373                 break;
1374         default:
1375                 return -EBUSY;
1376         }
1377
1378         switch (type) {
1379         case NL80211_IFTYPE_AP:
1380         case NL80211_IFTYPE_STATION:
1381         case NL80211_IFTYPE_ADHOC:
1382                 /*
1383                  * Could probably support everything
1384                  * but WDS here (WDS do_open can fail
1385                  * under memory pressure, which this
1386                  * code isn't prepared to handle).
1387                  */
1388                 break;
1389         case NL80211_IFTYPE_P2P_CLIENT:
1390                 p2p = true;
1391                 internal_type = NL80211_IFTYPE_STATION;
1392                 break;
1393         case NL80211_IFTYPE_P2P_GO:
1394                 p2p = true;
1395                 internal_type = NL80211_IFTYPE_AP;
1396                 break;
1397         default:
1398                 return -EBUSY;
1399         }
1400
1401         ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1402         if (ret)
1403                 return ret;
1404
1405         ieee80211_do_stop(sdata, false);
1406
1407         ieee80211_teardown_sdata(sdata);
1408
1409         ret = drv_change_interface(local, sdata, internal_type, p2p);
1410         if (ret)
1411                 type = ieee80211_vif_type_p2p(&sdata->vif);
1412
1413         /*
1414          * Ignore return value here, there's not much we can do since
1415          * the driver changed the interface type internally already.
1416          * The warnings will hopefully make driver authors fix it :-)
1417          */
1418         ieee80211_check_queues(sdata, type);
1419
1420         ieee80211_setup_sdata(sdata, type);
1421
1422         err = ieee80211_do_open(&sdata->wdev, false);
1423         WARN(err, "type change: do_open returned %d", err);
1424
1425         return ret;
1426 }
1427
1428 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1429                              enum nl80211_iftype type)
1430 {
1431         int ret;
1432
1433         ASSERT_RTNL();
1434
1435         if (type == ieee80211_vif_type_p2p(&sdata->vif))
1436                 return 0;
1437
1438         if (ieee80211_sdata_running(sdata)) {
1439                 ret = ieee80211_runtime_change_iftype(sdata, type);
1440                 if (ret)
1441                         return ret;
1442         } else {
1443                 /* Purge and reset type-dependent state. */
1444                 ieee80211_teardown_sdata(sdata);
1445                 ieee80211_setup_sdata(sdata, type);
1446         }
1447
1448         /* reset some values that shouldn't be kept across type changes */
1449         sdata->drop_unencrypted = 0;
1450         if (type == NL80211_IFTYPE_STATION)
1451                 sdata->u.mgd.use_4addr = false;
1452
1453         return 0;
1454 }
1455
1456 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1457                                        u8 *perm_addr, enum nl80211_iftype type)
1458 {
1459         struct ieee80211_sub_if_data *sdata;
1460         u64 mask, start, addr, val, inc;
1461         u8 *m;
1462         u8 tmp_addr[ETH_ALEN];
1463         int i;
1464
1465         /* default ... something at least */
1466         memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1467
1468         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1469             local->hw.wiphy->n_addresses <= 1)
1470                 return;
1471
1472         mutex_lock(&local->iflist_mtx);
1473
1474         switch (type) {
1475         case NL80211_IFTYPE_MONITOR:
1476                 /* doesn't matter */
1477                 break;
1478         case NL80211_IFTYPE_WDS:
1479         case NL80211_IFTYPE_AP_VLAN:
1480                 /* match up with an AP interface */
1481                 list_for_each_entry(sdata, &local->interfaces, list) {
1482                         if (sdata->vif.type != NL80211_IFTYPE_AP)
1483                                 continue;
1484                         memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1485                         break;
1486                 }
1487                 /* keep default if no AP interface present */
1488                 break;
1489         case NL80211_IFTYPE_P2P_CLIENT:
1490         case NL80211_IFTYPE_P2P_GO:
1491                 if (local->hw.flags & IEEE80211_HW_P2P_DEV_ADDR_FOR_INTF) {
1492                         list_for_each_entry(sdata, &local->interfaces, list) {
1493                                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1494                                         continue;
1495                                 if (!ieee80211_sdata_running(sdata))
1496                                         continue;
1497                                 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1498                                 goto out_unlock;
1499                         }
1500                 }
1501                 /* otherwise fall through */
1502         default:
1503                 /* assign a new address if possible -- try n_addresses first */
1504                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1505                         bool used = false;
1506
1507                         list_for_each_entry(sdata, &local->interfaces, list) {
1508                                 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr,
1509                                                      sdata->vif.addr)) {
1510                                         used = true;
1511                                         break;
1512                                 }
1513                         }
1514
1515                         if (!used) {
1516                                 memcpy(perm_addr,
1517                                        local->hw.wiphy->addresses[i].addr,
1518                                        ETH_ALEN);
1519                                 break;
1520                         }
1521                 }
1522
1523                 /* try mask if available */
1524                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1525                         break;
1526
1527                 m = local->hw.wiphy->addr_mask;
1528                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1529                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1530                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1531
1532                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1533                         /* not a contiguous mask ... not handled now! */
1534                         pr_info("not contiguous\n");
1535                         break;
1536                 }
1537
1538                 /*
1539                  * Pick address of existing interface in case user changed
1540                  * MAC address manually, default to perm_addr.
1541                  */
1542                 m = local->hw.wiphy->perm_addr;
1543                 list_for_each_entry(sdata, &local->interfaces, list) {
1544                         if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
1545                                 continue;
1546                         m = sdata->vif.addr;
1547                         break;
1548                 }
1549                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1550                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1551                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1552
1553                 inc = 1ULL<<__ffs64(mask);
1554                 val = (start & mask);
1555                 addr = (start & ~mask) | (val & mask);
1556                 do {
1557                         bool used = false;
1558
1559                         tmp_addr[5] = addr >> 0*8;
1560                         tmp_addr[4] = addr >> 1*8;
1561                         tmp_addr[3] = addr >> 2*8;
1562                         tmp_addr[2] = addr >> 3*8;
1563                         tmp_addr[1] = addr >> 4*8;
1564                         tmp_addr[0] = addr >> 5*8;
1565
1566                         val += inc;
1567
1568                         list_for_each_entry(sdata, &local->interfaces, list) {
1569                                 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) {
1570                                         used = true;
1571                                         break;
1572                                 }
1573                         }
1574
1575                         if (!used) {
1576                                 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1577                                 break;
1578                         }
1579                         addr = (start & ~mask) | (val & mask);
1580                 } while (addr != start);
1581
1582                 break;
1583         }
1584
1585  out_unlock:
1586         mutex_unlock(&local->iflist_mtx);
1587 }
1588
1589 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1590                      struct wireless_dev **new_wdev, enum nl80211_iftype type,
1591                      struct vif_params *params)
1592 {
1593         struct net_device *ndev = NULL;
1594         struct ieee80211_sub_if_data *sdata = NULL;
1595         int ret, i;
1596         int txqs = 1;
1597
1598         ASSERT_RTNL();
1599
1600         if (type == NL80211_IFTYPE_P2P_DEVICE) {
1601                 struct wireless_dev *wdev;
1602
1603                 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1604                                 GFP_KERNEL);
1605                 if (!sdata)
1606                         return -ENOMEM;
1607                 wdev = &sdata->wdev;
1608
1609                 sdata->dev = NULL;
1610                 strlcpy(sdata->name, name, IFNAMSIZ);
1611                 ieee80211_assign_perm_addr(local, wdev->address, type);
1612                 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1613         } else {
1614                 if (local->hw.queues >= IEEE80211_NUM_ACS)
1615                         txqs = IEEE80211_NUM_ACS;
1616
1617                 ndev = alloc_netdev_mqs(sizeof(*sdata) +
1618                                         local->hw.vif_data_size,
1619                                         name, ieee80211_if_setup, txqs, 1);
1620                 if (!ndev)
1621                         return -ENOMEM;
1622                 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1623
1624                 ndev->needed_headroom = local->tx_headroom +
1625                                         4*6 /* four MAC addresses */
1626                                         + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1627                                         + 6 /* mesh */
1628                                         + 8 /* rfc1042/bridge tunnel */
1629                                         - ETH_HLEN /* ethernet hard_header_len */
1630                                         + IEEE80211_ENCRYPT_HEADROOM;
1631                 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1632
1633                 ret = dev_alloc_name(ndev, ndev->name);
1634                 if (ret < 0) {
1635                         free_netdev(ndev);
1636                         return ret;
1637                 }
1638
1639                 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1640                 memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1641                 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1642
1643                 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1644                 sdata = netdev_priv(ndev);
1645                 ndev->ieee80211_ptr = &sdata->wdev;
1646                 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1647                 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1648
1649                 sdata->dev = ndev;
1650         }
1651
1652         /* initialise type-independent data */
1653         sdata->wdev.wiphy = local->hw.wiphy;
1654         sdata->local = local;
1655
1656         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1657                 skb_queue_head_init(&sdata->fragments[i].skb_list);
1658
1659         INIT_LIST_HEAD(&sdata->key_list);
1660
1661         INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
1662                           ieee80211_dfs_cac_timer_work);
1663         INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
1664                           ieee80211_delayed_tailroom_dec);
1665
1666         for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1667                 struct ieee80211_supported_band *sband;
1668                 sband = local->hw.wiphy->bands[i];
1669                 sdata->rc_rateidx_mask[i] =
1670                         sband ? (1 << sband->n_bitrates) - 1 : 0;
1671                 if (sband)
1672                         memcpy(sdata->rc_rateidx_mcs_mask[i],
1673                                sband->ht_cap.mcs.rx_mask,
1674                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1675                 else
1676                         memset(sdata->rc_rateidx_mcs_mask[i], 0,
1677                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1678         }
1679
1680         ieee80211_set_default_queues(sdata);
1681
1682         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1683         sdata->user_power_level = local->user_power_level;
1684
1685         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1686
1687         /* setup type-dependent data */
1688         ieee80211_setup_sdata(sdata, type);
1689
1690         if (ndev) {
1691                 if (params) {
1692                         ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1693                         if (type == NL80211_IFTYPE_STATION)
1694                                 sdata->u.mgd.use_4addr = params->use_4addr;
1695                 }
1696
1697                 ndev->features |= local->hw.netdev_features;
1698
1699                 ret = register_netdevice(ndev);
1700                 if (ret) {
1701                         free_netdev(ndev);
1702                         return ret;
1703                 }
1704         }
1705
1706         mutex_lock(&local->iflist_mtx);
1707         list_add_tail_rcu(&sdata->list, &local->interfaces);
1708         mutex_unlock(&local->iflist_mtx);
1709
1710         if (new_wdev)
1711                 *new_wdev = &sdata->wdev;
1712
1713         return 0;
1714 }
1715
1716 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1717 {
1718         ASSERT_RTNL();
1719
1720         mutex_lock(&sdata->local->iflist_mtx);
1721         list_del_rcu(&sdata->list);
1722         mutex_unlock(&sdata->local->iflist_mtx);
1723
1724         synchronize_rcu();
1725
1726         if (sdata->dev) {
1727                 unregister_netdevice(sdata->dev);
1728         } else {
1729                 cfg80211_unregister_wdev(&sdata->wdev);
1730                 kfree(sdata);
1731         }
1732 }
1733
1734 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
1735 {
1736         if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
1737                 return;
1738         ieee80211_do_stop(sdata, true);
1739         ieee80211_teardown_sdata(sdata);
1740 }
1741
1742 /*
1743  * Remove all interfaces, may only be called at hardware unregistration
1744  * time because it doesn't do RCU-safe list removals.
1745  */
1746 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1747 {
1748         struct ieee80211_sub_if_data *sdata, *tmp;
1749         LIST_HEAD(unreg_list);
1750         LIST_HEAD(wdev_list);
1751
1752         ASSERT_RTNL();
1753
1754         /*
1755          * Close all AP_VLAN interfaces first, as otherwise they
1756          * might be closed while the AP interface they belong to
1757          * is closed, causing unregister_netdevice_many() to crash.
1758          */
1759         list_for_each_entry(sdata, &local->interfaces, list)
1760                 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1761                         dev_close(sdata->dev);
1762
1763         mutex_lock(&local->iflist_mtx);
1764         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1765                 list_del(&sdata->list);
1766
1767                 if (sdata->dev)
1768                         unregister_netdevice_queue(sdata->dev, &unreg_list);
1769                 else
1770                         list_add(&sdata->list, &wdev_list);
1771         }
1772         mutex_unlock(&local->iflist_mtx);
1773         unregister_netdevice_many(&unreg_list);
1774         list_del(&unreg_list);
1775
1776         list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
1777                 list_del(&sdata->list);
1778                 cfg80211_unregister_wdev(&sdata->wdev);
1779                 kfree(sdata);
1780         }
1781 }
1782
1783 static int netdev_notify(struct notifier_block *nb,
1784                          unsigned long state, void *ptr)
1785 {
1786         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1787         struct ieee80211_sub_if_data *sdata;
1788
1789         if (state != NETDEV_CHANGENAME)
1790                 return NOTIFY_DONE;
1791
1792         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1793                 return NOTIFY_DONE;
1794
1795         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1796                 return NOTIFY_DONE;
1797
1798         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1799         memcpy(sdata->name, dev->name, IFNAMSIZ);
1800         ieee80211_debugfs_rename_netdev(sdata);
1801
1802         return NOTIFY_OK;
1803 }
1804
1805 static struct notifier_block mac80211_netdev_notifier = {
1806         .notifier_call = netdev_notify,
1807 };
1808
1809 int ieee80211_iface_init(void)
1810 {
1811         return register_netdevice_notifier(&mac80211_netdev_notifier);
1812 }
1813
1814 void ieee80211_iface_exit(void)
1815 {
1816         unregister_netdevice_notifier(&mac80211_netdev_notifier);
1817 }