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         mutex_lock(&local->mtx);
 842         sdata->vif.csa_active = false;
 843         if (!ieee80211_csa_needs_block_tx(local))
 844                 ieee80211_wake_queues_by_reason(&local->hw,
 845                                         IEEE80211_MAX_QUEUE_MAP,
 846                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 847         mutex_unlock(&local->mtx);
 848         sdata_unlock(sdata);
 849
 850         cancel_work_sync(&sdata->csa_finalize_work);
 851
 852         cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
 853
 854         if (sdata->wdev.cac_started) {
 855                 chandef = sdata->vif.bss_conf.chandef;
 856                 WARN_ON(local->suspended);
 857                 mutex_lock(&local->mtx);
 858                 ieee80211_vif_release_channel(sdata);
 859                 mutex_unlock(&local->mtx);
 860                 cfg80211_cac_event(sdata->dev, &chandef,
 861                                    NL80211_RADAR_CAC_ABORTED,
 862                                    GFP_KERNEL);
 863         }
 864
 865         /* APs need special treatment */
 866         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 867                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
 868
 869                 /* down all dependent devices, that is VLANs */
 870                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
 871                                          u.vlan.list)
 872                         dev_close(vlan->dev);
 873                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
 874         } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 875                 /* remove all packets in parent bc_buf pointing to this dev */
 876                 ps = &sdata->bss->ps;
 877
 878                 spin_lock_irqsave(&ps->bc_buf.lock, flags);
 879                 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
 880                         if (skb->dev == sdata->dev) {
 881                                 __skb_unlink(skb, &ps->bc_buf);
 882                                 local->total_ps_buffered--;
 883                                 ieee80211_free_txskb(&local->hw, skb);
 884                         }
 885                 }
 886                 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
 887         }
 888
 889         if (going_down)
 890                 local->open_count--;
 891
 892         switch (sdata->vif.type) {
 893         case NL80211_IFTYPE_AP_VLAN:
 894                 mutex_lock(&local->mtx);
 895                 list_del(&sdata->u.vlan.list);
 896                 mutex_unlock(&local->mtx);
 897                 RCU_INIT_POINTER(sdata->vif.chanctx_conf, NULL);
 898                 /* no need to tell driver */
 899                 break;
 900         case NL80211_IFTYPE_MONITOR:
 901                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 902                         local->cooked_mntrs--;
 903                         break;
 904                 }
 905
 906                 local->monitors--;
 907                 if (local->monitors == 0) {
 908                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
 909                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 910                 }
 911
 912                 ieee80211_adjust_monitor_flags(sdata, -1);
 913                 break;
 914         case NL80211_IFTYPE_P2P_DEVICE:
 915                 /* relies on synchronize_rcu() below */
 916                 RCU_INIT_POINTER(local->p2p_sdata, NULL);
 917                 /* fall through */
 918         default:
 919                 cancel_work_sync(&sdata->work);
 920                 /*
 921                  * When we get here, the interface is marked down.
 922                  * Free the remaining keys, if there are any
 923                  * (shouldn't be, except maybe in WDS mode?)
 924                  *
 925                  * Force the key freeing to always synchronize_net()
 926                  * to wait for the RX path in case it is using this
 927                  * interface enqueuing frames * at this very time on
 928                  * another CPU.
 929                  */
 930                 ieee80211_free_keys(sdata, true);
 931
 932                 /* fall through */
 933         case NL80211_IFTYPE_AP:
 934                 skb_queue_purge(&sdata->skb_queue);
 935         }
 936
 937         sdata->bss = NULL;
 938
 939         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 940         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 941                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
 942                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 943                         if (info->control.vif == &sdata->vif) {
 944                                 __skb_unlink(skb, &local->pending[i]);
 945                                 ieee80211_free_txskb(&local->hw, skb);
 946                         }
 947                 }
 948         }
 949         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 950
 951         if (local->open_count == 0)
 952                 ieee80211_clear_tx_pending(local);
 953
 954         /*
 955          * If the interface goes down while suspended, presumably because
 956          * the device was unplugged and that happens before our resume,
 957          * then the driver is already unconfigured and the remainder of
 958          * this function isn't needed.
 959          * XXX: what about WoWLAN? If the device has software state, e.g.
 960          *      memory allocated, it might expect teardown commands from
 961          *      mac80211 here?
 962          */
 963         if (local->suspended) {
 964                 WARN_ON(local->wowlan);
 965                 WARN_ON(rtnl_dereference(local->monitor_sdata));
 966                 return;
 967         }
 968
 969         switch (sdata->vif.type) {
 970         case NL80211_IFTYPE_AP_VLAN:
 971                 break;
 972         case NL80211_IFTYPE_MONITOR:
 973                 if (local->monitors == 0)
 974                         ieee80211_del_virtual_monitor(local);
 975
 976                 mutex_lock(&local->mtx);
 977                 ieee80211_recalc_idle(local);
 978                 mutex_unlock(&local->mtx);
 979
 980                 if (!(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE))
 981                         break;
 982
 983                 /* fall through */
 984         default:
 985                 if (going_down)
 986                         drv_remove_interface(local, sdata);
 987         }
 988
 989         ieee80211_recalc_ps(local, -1);
 990
 991         if (local->open_count == 0) {
 992                 ieee80211_stop_device(local);
 993
 994                 /* no reconfiguring after stop! */
 995                 return;
 996         }
 997
 998         /* do after stop to avoid reconfiguring when we stop anyway */
 999         ieee80211_configure_filter(local);
1000         ieee80211_hw_config(local, hw_reconf_flags);
1001
1002         if (local->monitors == local->open_count)
1003                 ieee80211_add_virtual_monitor(local);
1004 }
1005
1006 static int ieee80211_stop(struct net_device *dev)
1007 {
1008         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1009
1010         ieee80211_do_stop(sdata, true);
1011
1012         return 0;
1013 }
1014
1015 static void ieee80211_set_multicast_list(struct net_device *dev)
1016 {
1017         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1018         struct ieee80211_local *local = sdata->local;
1019         int allmulti, promisc, sdata_allmulti, sdata_promisc;
1020
1021         allmulti = !!(dev->flags & IFF_ALLMULTI);
1022         promisc = !!(dev->flags & IFF_PROMISC);
1023         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
1024         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
1025
1026         if (allmulti != sdata_allmulti) {
1027                 if (dev->flags & IFF_ALLMULTI)
1028                         atomic_inc(&local->iff_allmultis);
1029                 else
1030                         atomic_dec(&local->iff_allmultis);
1031                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
1032         }
1033
1034         if (promisc != sdata_promisc) {
1035                 if (dev->flags & IFF_PROMISC)
1036                         atomic_inc(&local->iff_promiscs);
1037                 else
1038                         atomic_dec(&local->iff_promiscs);
1039                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
1040         }
1041         spin_lock_bh(&local->filter_lock);
1042         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
1043         spin_unlock_bh(&local->filter_lock);
1044         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
1045 }
1046
1047 /*
1048  * Called when the netdev is removed or, by the code below, before
1049  * the interface type changes.
1050  */
1051 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
1052 {
1053         int i;
1054
1055         /* free extra data */
1056         ieee80211_free_keys(sdata, false);
1057
1058         ieee80211_debugfs_remove_netdev(sdata);
1059
1060         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1061                 __skb_queue_purge(&sdata->fragments[i].skb_list);
1062         sdata->fragment_next = 0;
1063
1064         if (ieee80211_vif_is_mesh(&sdata->vif))
1065                 mesh_rmc_free(sdata);
1066 }
1067
1068 static void ieee80211_uninit(struct net_device *dev)
1069 {
1070         ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
1071 }
1072
1073 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
1074                                          struct sk_buff *skb,
1075                                          void *accel_priv,
1076                                          select_queue_fallback_t fallback)
1077 {
1078         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
1079 }
1080
1081 static const struct net_device_ops ieee80211_dataif_ops = {
1082         .ndo_open               = ieee80211_open,
1083         .ndo_stop               = ieee80211_stop,
1084         .ndo_uninit             = ieee80211_uninit,
1085         .ndo_start_xmit         = ieee80211_subif_start_xmit,
1086         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1087         .ndo_change_mtu         = ieee80211_change_mtu,
1088         .ndo_set_mac_address    = ieee80211_change_mac,
1089         .ndo_select_queue       = ieee80211_netdev_select_queue,
1090 };
1091
1092 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
1093                                           struct sk_buff *skb,
1094                                           void *accel_priv,
1095                                           select_queue_fallback_t fallback)
1096 {
1097         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1098         struct ieee80211_local *local = sdata->local;
1099         struct ieee80211_hdr *hdr;
1100         struct ieee80211_radiotap_header *rtap = (void *)skb->data;
1101
1102         if (local->hw.queues < IEEE80211_NUM_ACS)
1103                 return 0;
1104
1105         if (skb->len < 4 ||
1106             skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
1107                 return 0; /* doesn't matter, frame will be dropped */
1108
1109         hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
1110
1111         return ieee80211_select_queue_80211(sdata, skb, hdr);
1112 }
1113
1114 static const struct net_device_ops ieee80211_monitorif_ops = {
1115         .ndo_open               = ieee80211_open,
1116         .ndo_stop               = ieee80211_stop,
1117         .ndo_uninit             = ieee80211_uninit,
1118         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
1119         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1120         .ndo_change_mtu         = ieee80211_change_mtu,
1121         .ndo_set_mac_address    = ieee80211_change_mac,
1122         .ndo_select_queue       = ieee80211_monitor_select_queue,
1123 };
1124
1125 static void ieee80211_if_setup(struct net_device *dev)
1126 {
1127         ether_setup(dev);
1128         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1129         dev->netdev_ops = &ieee80211_dataif_ops;
1130         dev->destructor = free_netdev;
1131 }
1132
1133 static void ieee80211_iface_work(struct work_struct *work)
1134 {
1135         struct ieee80211_sub_if_data *sdata =
1136                 container_of(work, struct ieee80211_sub_if_data, work);
1137         struct ieee80211_local *local = sdata->local;
1138         struct sk_buff *skb;
1139         struct sta_info *sta;
1140         struct ieee80211_ra_tid *ra_tid;
1141
1142         if (!ieee80211_sdata_running(sdata))
1143                 return;
1144
1145         if (local->scanning)
1146                 return;
1147
1148         /*
1149          * ieee80211_queue_work() should have picked up most cases,
1150          * here we'll pick the rest.
1151          */
1152         if (WARN(local->suspended,
1153                  "interface work scheduled while going to suspend\n"))
1154                 return;
1155
1156         /* first process frames */
1157         while ((skb = skb_dequeue(&sdata->skb_queue))) {
1158                 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1159
1160                 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
1161                         ra_tid = (void *)&skb->cb;
1162                         ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
1163                                                  ra_tid->tid);
1164                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
1165                         ra_tid = (void *)&skb->cb;
1166                         ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
1167                                                 ra_tid->tid);
1168                 } else if (ieee80211_is_action(mgmt->frame_control) &&
1169                            mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1170                         int len = skb->len;
1171
1172                         mutex_lock(&local->sta_mtx);
1173                         sta = sta_info_get_bss(sdata, mgmt->sa);
1174                         if (sta) {
1175                                 switch (mgmt->u.action.u.addba_req.action_code) {
1176                                 case WLAN_ACTION_ADDBA_REQ:
1177                                         ieee80211_process_addba_request(
1178                                                         local, sta, mgmt, len);
1179                                         break;
1180                                 case WLAN_ACTION_ADDBA_RESP:
1181                                         ieee80211_process_addba_resp(local, sta,
1182                                                                      mgmt, len);
1183                                         break;
1184                                 case WLAN_ACTION_DELBA:
1185                                         ieee80211_process_delba(sdata, sta,
1186                                                                 mgmt, len);
1187                                         break;
1188                                 default:
1189                                         WARN_ON(1);
1190                                         break;
1191                                 }
1192                         }
1193                         mutex_unlock(&local->sta_mtx);
1194                 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1195                         struct ieee80211_hdr *hdr = (void *)mgmt;
1196                         /*
1197                          * So the frame isn't mgmt, but frame_control
1198                          * is at the right place anyway, of course, so
1199                          * the if statement is correct.
1200                          *
1201                          * Warn if we have other data frame types here,
1202                          * they must not get here.
1203                          */
1204                         WARN_ON(hdr->frame_control &
1205                                         cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1206                         WARN_ON(!(hdr->seq_ctrl &
1207                                         cpu_to_le16(IEEE80211_SCTL_FRAG)));
1208                         /*
1209                          * This was a fragment of a frame, received while
1210                          * a block-ack session was active. That cannot be
1211                          * right, so terminate the session.
1212                          */
1213                         mutex_lock(&local->sta_mtx);
1214                         sta = sta_info_get_bss(sdata, mgmt->sa);
1215                         if (sta) {
1216                                 u16 tid = *ieee80211_get_qos_ctl(hdr) &
1217                                                 IEEE80211_QOS_CTL_TID_MASK;
1218
1219                                 __ieee80211_stop_rx_ba_session(
1220                                         sta, tid, WLAN_BACK_RECIPIENT,
1221                                         WLAN_REASON_QSTA_REQUIRE_SETUP,
1222                                         true);
1223                         }
1224                         mutex_unlock(&local->sta_mtx);
1225                 } else switch (sdata->vif.type) {
1226                 case NL80211_IFTYPE_STATION:
1227                         ieee80211_sta_rx_queued_mgmt(sdata, skb);
1228                         break;
1229                 case NL80211_IFTYPE_ADHOC:
1230                         ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1231                         break;
1232                 case NL80211_IFTYPE_MESH_POINT:
1233                         if (!ieee80211_vif_is_mesh(&sdata->vif))
1234                                 break;
1235                         ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1236                         break;
1237                 default:
1238                         WARN(1, "frame for unexpected interface type");
1239                         break;
1240                 }
1241
1242                 kfree_skb(skb);
1243         }
1244
1245         /* then other type-dependent work */
1246         switch (sdata->vif.type) {
1247         case NL80211_IFTYPE_STATION:
1248                 ieee80211_sta_work(sdata);
1249                 break;
1250         case NL80211_IFTYPE_ADHOC:
1251                 ieee80211_ibss_work(sdata);
1252                 break;
1253         case NL80211_IFTYPE_MESH_POINT:
1254                 if (!ieee80211_vif_is_mesh(&sdata->vif))
1255                         break;
1256                 ieee80211_mesh_work(sdata);
1257                 break;
1258         default:
1259                 break;
1260         }
1261 }
1262
1263 static void ieee80211_recalc_smps_work(struct work_struct *work)
1264 {
1265         struct ieee80211_sub_if_data *sdata =
1266                 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1267
1268         ieee80211_recalc_smps(sdata);
1269 }
1270
1271 /*
1272  * Helper function to initialise an interface to a specific type.
1273  */
1274 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1275                                   enum nl80211_iftype type)
1276 {
1277         /* clear type-dependent union */
1278         memset(&sdata->u, 0, sizeof(sdata->u));
1279
1280         /* and set some type-dependent values */
1281         sdata->vif.type = type;
1282         sdata->vif.p2p = false;
1283         sdata->wdev.iftype = type;
1284
1285         sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1286         sdata->control_port_no_encrypt = false;
1287         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1288
1289         sdata->noack_map = 0;
1290
1291         /* only monitor/p2p-device differ */
1292         if (sdata->dev) {
1293                 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1294                 sdata->dev->type = ARPHRD_ETHER;
1295         }
1296
1297         skb_queue_head_init(&sdata->skb_queue);
1298         INIT_WORK(&sdata->work, ieee80211_iface_work);
1299         INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1300         INIT_WORK(&sdata->csa_finalize_work, ieee80211_csa_finalize_work);
1301         INIT_LIST_HEAD(&sdata->assigned_chanctx_list);
1302         INIT_LIST_HEAD(&sdata->reserved_chanctx_list);
1303
1304         switch (type) {
1305         case NL80211_IFTYPE_P2P_GO:
1306                 type = NL80211_IFTYPE_AP;
1307                 sdata->vif.type = type;
1308                 sdata->vif.p2p = true;
1309                 /* fall through */
1310         case NL80211_IFTYPE_AP:
1311                 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1312                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1313                 INIT_WORK(&sdata->u.ap.request_smps_work,
1314                           ieee80211_request_smps_ap_work);
1315                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1316                 sdata->u.ap.req_smps = IEEE80211_SMPS_OFF;
1317                 break;
1318         case NL80211_IFTYPE_P2P_CLIENT:
1319                 type = NL80211_IFTYPE_STATION;
1320                 sdata->vif.type = type;
1321                 sdata->vif.p2p = true;
1322                 /* fall through */
1323         case NL80211_IFTYPE_STATION:
1324                 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1325                 ieee80211_sta_setup_sdata(sdata);
1326                 break;
1327         case NL80211_IFTYPE_ADHOC:
1328                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1329                 ieee80211_ibss_setup_sdata(sdata);
1330                 break;
1331         case NL80211_IFTYPE_MESH_POINT:
1332                 if (ieee80211_vif_is_mesh(&sdata->vif))
1333                         ieee80211_mesh_init_sdata(sdata);
1334                 break;
1335         case NL80211_IFTYPE_MONITOR:
1336                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1337                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1338                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
1339                                       MONITOR_FLAG_OTHER_BSS;
1340                 break;
1341         case NL80211_IFTYPE_WDS:
1342                 sdata->vif.bss_conf.bssid = NULL;
1343                 break;
1344         case NL80211_IFTYPE_AP_VLAN:
1345         case NL80211_IFTYPE_P2P_DEVICE:
1346                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1347                 break;
1348         case NL80211_IFTYPE_UNSPECIFIED:
1349         case NUM_NL80211_IFTYPES:
1350                 BUG();
1351                 break;
1352         }
1353
1354         ieee80211_debugfs_add_netdev(sdata);
1355 }
1356
1357 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1358                                            enum nl80211_iftype type)
1359 {
1360         struct ieee80211_local *local = sdata->local;
1361         int ret, err;
1362         enum nl80211_iftype internal_type = type;
1363         bool p2p = false;
1364
1365         ASSERT_RTNL();
1366
1367         if (!local->ops->change_interface)
1368                 return -EBUSY;
1369
1370         switch (sdata->vif.type) {
1371         case NL80211_IFTYPE_AP:
1372         case NL80211_IFTYPE_STATION:
1373         case NL80211_IFTYPE_ADHOC:
1374                 /*
1375                  * Could maybe also all others here?
1376                  * Just not sure how that interacts
1377                  * with the RX/config path e.g. for
1378                  * mesh.
1379                  */
1380                 break;
1381         default:
1382                 return -EBUSY;
1383         }
1384
1385         switch (type) {
1386         case NL80211_IFTYPE_AP:
1387         case NL80211_IFTYPE_STATION:
1388         case NL80211_IFTYPE_ADHOC:
1389                 /*
1390                  * Could probably support everything
1391                  * but WDS here (WDS do_open can fail
1392                  * under memory pressure, which this
1393                  * code isn't prepared to handle).
1394                  */
1395                 break;
1396         case NL80211_IFTYPE_P2P_CLIENT:
1397                 p2p = true;
1398                 internal_type = NL80211_IFTYPE_STATION;
1399                 break;
1400         case NL80211_IFTYPE_P2P_GO:
1401                 p2p = true;
1402                 internal_type = NL80211_IFTYPE_AP;
1403                 break;
1404         default:
1405                 return -EBUSY;
1406         }
1407
1408         ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1409         if (ret)
1410                 return ret;
1411
1412         ieee80211_do_stop(sdata, false);
1413
1414         ieee80211_teardown_sdata(sdata);
1415
1416         ret = drv_change_interface(local, sdata, internal_type, p2p);
1417         if (ret)
1418                 type = ieee80211_vif_type_p2p(&sdata->vif);
1419
1420         /*
1421          * Ignore return value here, there's not much we can do since
1422          * the driver changed the interface type internally already.
1423          * The warnings will hopefully make driver authors fix it :-)
1424          */
1425         ieee80211_check_queues(sdata, type);
1426
1427         ieee80211_setup_sdata(sdata, type);
1428
1429         err = ieee80211_do_open(&sdata->wdev, false);
1430         WARN(err, "type change: do_open returned %d", err);
1431
1432         return ret;
1433 }
1434
1435 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1436                              enum nl80211_iftype type)
1437 {
1438         int ret;
1439
1440         ASSERT_RTNL();
1441
1442         if (type == ieee80211_vif_type_p2p(&sdata->vif))
1443                 return 0;
1444
1445         if (ieee80211_sdata_running(sdata)) {
1446                 ret = ieee80211_runtime_change_iftype(sdata, type);
1447                 if (ret)
1448                         return ret;
1449         } else {
1450                 /* Purge and reset type-dependent state. */
1451                 ieee80211_teardown_sdata(sdata);
1452                 ieee80211_setup_sdata(sdata, type);
1453         }
1454
1455         /* reset some values that shouldn't be kept across type changes */
1456         sdata->drop_unencrypted = 0;
1457         if (type == NL80211_IFTYPE_STATION)
1458                 sdata->u.mgd.use_4addr = false;
1459
1460         return 0;
1461 }
1462
1463 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1464                                        u8 *perm_addr, enum nl80211_iftype type)
1465 {
1466         struct ieee80211_sub_if_data *sdata;
1467         u64 mask, start, addr, val, inc;
1468         u8 *m;
1469         u8 tmp_addr[ETH_ALEN];
1470         int i;
1471
1472         /* default ... something at least */
1473         memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1474
1475         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1476             local->hw.wiphy->n_addresses <= 1)
1477                 return;
1478
1479         mutex_lock(&local->iflist_mtx);
1480
1481         switch (type) {
1482         case NL80211_IFTYPE_MONITOR:
1483                 /* doesn't matter */
1484                 break;
1485         case NL80211_IFTYPE_WDS:
1486         case NL80211_IFTYPE_AP_VLAN:
1487                 /* match up with an AP interface */
1488                 list_for_each_entry(sdata, &local->interfaces, list) {
1489                         if (sdata->vif.type != NL80211_IFTYPE_AP)
1490                                 continue;
1491                         memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1492                         break;
1493                 }
1494                 /* keep default if no AP interface present */
1495                 break;
1496         case NL80211_IFTYPE_P2P_CLIENT:
1497         case NL80211_IFTYPE_P2P_GO:
1498                 if (local->hw.flags & IEEE80211_HW_P2P_DEV_ADDR_FOR_INTF) {
1499                         list_for_each_entry(sdata, &local->interfaces, list) {
1500                                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1501                                         continue;
1502                                 if (!ieee80211_sdata_running(sdata))
1503                                         continue;
1504                                 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1505                                 goto out_unlock;
1506                         }
1507                 }
1508                 /* otherwise fall through */
1509         default:
1510                 /* assign a new address if possible -- try n_addresses first */
1511                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1512                         bool used = false;
1513
1514                         list_for_each_entry(sdata, &local->interfaces, list) {
1515                                 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr,
1516                                                      sdata->vif.addr)) {
1517                                         used = true;
1518                                         break;
1519                                 }
1520                         }
1521
1522                         if (!used) {
1523                                 memcpy(perm_addr,
1524                                        local->hw.wiphy->addresses[i].addr,
1525                                        ETH_ALEN);
1526                                 break;
1527                         }
1528                 }
1529
1530                 /* try mask if available */
1531                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1532                         break;
1533
1534                 m = local->hw.wiphy->addr_mask;
1535                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1536                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1537                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1538
1539                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1540                         /* not a contiguous mask ... not handled now! */
1541                         pr_info("not contiguous\n");
1542                         break;
1543                 }
1544
1545                 /*
1546                  * Pick address of existing interface in case user changed
1547                  * MAC address manually, default to perm_addr.
1548                  */
1549                 m = local->hw.wiphy->perm_addr;
1550                 list_for_each_entry(sdata, &local->interfaces, list) {
1551                         if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
1552                                 continue;
1553                         m = sdata->vif.addr;
1554                         break;
1555                 }
1556                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1557                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1558                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1559
1560                 inc = 1ULL<<__ffs64(mask);
1561                 val = (start & mask);
1562                 addr = (start & ~mask) | (val & mask);
1563                 do {
1564                         bool used = false;
1565
1566                         tmp_addr[5] = addr >> 0*8;
1567                         tmp_addr[4] = addr >> 1*8;
1568                         tmp_addr[3] = addr >> 2*8;
1569                         tmp_addr[2] = addr >> 3*8;
1570                         tmp_addr[1] = addr >> 4*8;
1571                         tmp_addr[0] = addr >> 5*8;
1572
1573                         val += inc;
1574
1575                         list_for_each_entry(sdata, &local->interfaces, list) {
1576                                 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) {
1577                                         used = true;
1578                                         break;
1579                                 }
1580                         }
1581
1582                         if (!used) {
1583                                 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1584                                 break;
1585                         }
1586                         addr = (start & ~mask) | (val & mask);
1587                 } while (addr != start);
1588
1589                 break;
1590         }
1591
1592  out_unlock:
1593         mutex_unlock(&local->iflist_mtx);
1594 }
1595
1596 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1597                      struct wireless_dev **new_wdev, enum nl80211_iftype type,
1598                      struct vif_params *params)
1599 {
1600         struct net_device *ndev = NULL;
1601         struct ieee80211_sub_if_data *sdata = NULL;
1602         int ret, i;
1603         int txqs = 1;
1604
1605         ASSERT_RTNL();
1606
1607         if (type == NL80211_IFTYPE_P2P_DEVICE) {
1608                 struct wireless_dev *wdev;
1609
1610                 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1611                                 GFP_KERNEL);
1612                 if (!sdata)
1613                         return -ENOMEM;
1614                 wdev = &sdata->wdev;
1615
1616                 sdata->dev = NULL;
1617                 strlcpy(sdata->name, name, IFNAMSIZ);
1618                 ieee80211_assign_perm_addr(local, wdev->address, type);
1619                 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1620         } else {
1621                 if (local->hw.queues >= IEEE80211_NUM_ACS)
1622                         txqs = IEEE80211_NUM_ACS;
1623
1624                 ndev = alloc_netdev_mqs(sizeof(*sdata) +
1625                                         local->hw.vif_data_size,
1626                                         name, ieee80211_if_setup, txqs, 1);
1627                 if (!ndev)
1628                         return -ENOMEM;
1629                 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1630
1631                 ndev->needed_headroom = local->tx_headroom +
1632                                         4*6 /* four MAC addresses */
1633                                         + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1634                                         + 6 /* mesh */
1635                                         + 8 /* rfc1042/bridge tunnel */
1636                                         - ETH_HLEN /* ethernet hard_header_len */
1637                                         + IEEE80211_ENCRYPT_HEADROOM;
1638                 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1639
1640                 ret = dev_alloc_name(ndev, ndev->name);
1641                 if (ret < 0) {
1642                         free_netdev(ndev);
1643                         return ret;
1644                 }
1645
1646                 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1647                 memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1648                 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1649
1650                 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1651                 sdata = netdev_priv(ndev);
1652                 ndev->ieee80211_ptr = &sdata->wdev;
1653                 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1654                 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1655
1656                 sdata->dev = ndev;
1657         }
1658
1659         /* initialise type-independent data */
1660         sdata->wdev.wiphy = local->hw.wiphy;
1661         sdata->local = local;
1662
1663         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1664                 skb_queue_head_init(&sdata->fragments[i].skb_list);
1665
1666         INIT_LIST_HEAD(&sdata->key_list);
1667
1668         INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
1669                           ieee80211_dfs_cac_timer_work);
1670         INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
1671                           ieee80211_delayed_tailroom_dec);
1672
1673         for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1674                 struct ieee80211_supported_band *sband;
1675                 sband = local->hw.wiphy->bands[i];
1676                 sdata->rc_rateidx_mask[i] =
1677                         sband ? (1 << sband->n_bitrates) - 1 : 0;
1678                 if (sband)
1679                         memcpy(sdata->rc_rateidx_mcs_mask[i],
1680                                sband->ht_cap.mcs.rx_mask,
1681                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1682                 else
1683                         memset(sdata->rc_rateidx_mcs_mask[i], 0,
1684                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1685         }
1686
1687         ieee80211_set_default_queues(sdata);
1688
1689         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1690         sdata->user_power_level = local->user_power_level;
1691
1692         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1693
1694         /* setup type-dependent data */
1695         ieee80211_setup_sdata(sdata, type);
1696
1697         if (ndev) {
1698                 if (params) {
1699                         ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1700                         if (type == NL80211_IFTYPE_STATION)
1701                                 sdata->u.mgd.use_4addr = params->use_4addr;
1702                 }
1703
1704                 ndev->features |= local->hw.netdev_features;
1705
1706                 ret = register_netdevice(ndev);
1707                 if (ret) {
1708                         free_netdev(ndev);
1709                         return ret;
1710                 }
1711         }
1712
1713         mutex_lock(&local->iflist_mtx);
1714         list_add_tail_rcu(&sdata->list, &local->interfaces);
1715         mutex_unlock(&local->iflist_mtx);
1716
1717         if (new_wdev)
1718                 *new_wdev = &sdata->wdev;
1719
1720         return 0;
1721 }
1722
1723 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1724 {
1725         ASSERT_RTNL();
1726
1727         mutex_lock(&sdata->local->iflist_mtx);
1728         list_del_rcu(&sdata->list);
1729         mutex_unlock(&sdata->local->iflist_mtx);
1730
1731         synchronize_rcu();
1732
1733         if (sdata->dev) {
1734                 unregister_netdevice(sdata->dev);
1735         } else {
1736                 cfg80211_unregister_wdev(&sdata->wdev);
1737                 kfree(sdata);
1738         }
1739 }
1740
1741 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
1742 {
1743         if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
1744                 return;
1745         ieee80211_do_stop(sdata, true);
1746         ieee80211_teardown_sdata(sdata);
1747 }
1748
1749 /*
1750  * Remove all interfaces, may only be called at hardware unregistration
1751  * time because it doesn't do RCU-safe list removals.
1752  */
1753 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1754 {
1755         struct ieee80211_sub_if_data *sdata, *tmp;
1756         LIST_HEAD(unreg_list);
1757         LIST_HEAD(wdev_list);
1758
1759         ASSERT_RTNL();
1760
1761         /*
1762          * Close all AP_VLAN interfaces first, as otherwise they
1763          * might be closed while the AP interface they belong to
1764          * is closed, causing unregister_netdevice_many() to crash.
1765          */
1766         list_for_each_entry(sdata, &local->interfaces, list)
1767                 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1768                         dev_close(sdata->dev);
1769
1770         mutex_lock(&local->iflist_mtx);
1771         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1772                 list_del(&sdata->list);
1773
1774                 if (sdata->dev)
1775                         unregister_netdevice_queue(sdata->dev, &unreg_list);
1776                 else
1777                         list_add(&sdata->list, &wdev_list);
1778         }
1779         mutex_unlock(&local->iflist_mtx);
1780         unregister_netdevice_many(&unreg_list);
1781         list_del(&unreg_list);
1782
1783         list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
1784                 list_del(&sdata->list);
1785                 cfg80211_unregister_wdev(&sdata->wdev);
1786                 kfree(sdata);
1787         }
1788 }
1789
1790 static int netdev_notify(struct notifier_block *nb,
1791                          unsigned long state, void *ptr)
1792 {
1793         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1794         struct ieee80211_sub_if_data *sdata;
1795
1796         if (state != NETDEV_CHANGENAME)
1797                 return NOTIFY_DONE;
1798
1799         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1800                 return NOTIFY_DONE;
1801
1802         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1803                 return NOTIFY_DONE;
1804
1805         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1806         memcpy(sdata->name, dev->name, IFNAMSIZ);
1807         ieee80211_debugfs_rename_netdev(sdata);
1808
1809         return NOTIFY_OK;
1810 }
1811
1812 static struct notifier_block mac80211_netdev_notifier = {
1813         .notifier_call = netdev_notify,
1814 };
1815
1816 int ieee80211_iface_init(void)
1817 {
1818         return register_netdevice_notifier(&mac80211_netdev_notifier);
1819 }
1820
1821 void ieee80211_iface_exit(void)
1822 {
1823         unregister_netdevice_notifier(&mac80211_netdev_notifier);
1824 }