net/mac80211/iface.c

   1 /*
   2  * Interface handling
   3  *
   4  * Copyright 2002-2005, Instant802 Networks, Inc.
   5  * Copyright 2005-2006, Devicescape Software, Inc.
   6  * Copyright (c) 2006 Jiri Benc <jbenc@suse.cz>
   7  * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
   8  * Copyright 2013-2014  Intel Mobile Communications GmbH
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2 as
  12  * published by the Free Software Foundation.
  13  */
  14 #include <linux/slab.h>
  15 #include <linux/kernel.h>
  16 #include <linux/if_arp.h>
  17 #include <linux/netdevice.h>
  18 #include <linux/rtnetlink.h>
  19 #include <net/mac80211.h>
  20 #include <net/ieee80211_radiotap.h>
  21 #include "ieee80211_i.h"
  22 #include "sta_info.h"
  23 #include "debugfs_netdev.h"
  24 #include "mesh.h"
  25 #include "led.h"
  26 #include "driver-ops.h"
  27 #include "wme.h"
  28 #include "rate.h"
  29
  30 /**
  31  * DOC: Interface list locking
  32  *
  33  * The interface list in each struct ieee80211_local is protected
  34  * three-fold:
  35  *
  36  * (1) modifications may only be done under the RTNL
  37  * (2) modifications and readers are protected against each other by
  38  *     the iflist_mtx.
  39  * (3) modifications are done in an RCU manner so atomic readers
  40  *     can traverse the list in RCU-safe blocks.
  41  *
  42  * As a consequence, reads (traversals) of the list can be protected
  43  * by either the RTNL, the iflist_mtx or RCU.
  44  */
  45
  46 bool __ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
  47 {
  48         struct ieee80211_chanctx_conf *chanctx_conf;
  49         int power;
  50
  51         rcu_read_lock();
  52         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
  53         if (!chanctx_conf) {
  54                 rcu_read_unlock();
  55                 return false;
  56         }
  57
  58         power = ieee80211_chandef_max_power(&chanctx_conf->def);
  59         rcu_read_unlock();
  60
  61         if (sdata->user_power_level != IEEE80211_UNSET_POWER_LEVEL)
  62                 power = min(power, sdata->user_power_level);
  63
  64         if (sdata->ap_power_level != IEEE80211_UNSET_POWER_LEVEL)
  65                 power = min(power, sdata->ap_power_level);
  66
  67         if (power != sdata->vif.bss_conf.txpower) {
  68                 sdata->vif.bss_conf.txpower = power;
  69                 ieee80211_hw_config(sdata->local, 0);
  70                 return true;
  71         }
  72
  73         return false;
  74 }
  75
  76 void ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata,
  77                               bool update_bss)
  78 {
  79         if (__ieee80211_recalc_txpower(sdata) || update_bss)
  80                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_TXPOWER);
  81 }
  82
  83 static u32 __ieee80211_idle_off(struct ieee80211_local *local)
  84 {
  85         if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
  86                 return 0;
  87
  88         local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
  89         return IEEE80211_CONF_CHANGE_IDLE;
  90 }
  91
  92 static u32 __ieee80211_idle_on(struct ieee80211_local *local)
  93 {
  94         if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
  95                 return 0;
  96
  97         ieee80211_flush_queues(local, NULL, false);
  98
  99         local->hw.conf.flags |= IEEE80211_CONF_IDLE;
 100         return IEEE80211_CONF_CHANGE_IDLE;
 101 }
 102
 103 static u32 __ieee80211_recalc_idle(struct ieee80211_local *local,
 104                                    bool force_active)
 105 {
 106         bool working, scanning, active;
 107         unsigned int led_trig_start = 0, led_trig_stop = 0;
 108
 109         lockdep_assert_held(&local->mtx);
 110
 111         active = force_active ||
 112                  !list_empty(&local->chanctx_list) ||
 113                  local->monitors;
 114
 115         working = !local->ops->remain_on_channel &&
 116                   !list_empty(&local->roc_list);
 117
 118         scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) ||
 119                    test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning);
 120
 121         if (working || scanning)
 122                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
 123         else
 124                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
 125
 126         if (active)
 127                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
 128         else
 129                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
 130
 131         ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
 132
 133         if (working || scanning || active)
 134                 return __ieee80211_idle_off(local);
 135         return __ieee80211_idle_on(local);
 136 }
 137
 138 u32 ieee80211_idle_off(struct ieee80211_local *local)
 139 {
 140         return __ieee80211_recalc_idle(local, true);
 141 }
 142
 143 void ieee80211_recalc_idle(struct ieee80211_local *local)
 144 {
 145         u32 change = __ieee80211_recalc_idle(local, false);
 146         if (change)
 147                 ieee80211_hw_config(local, change);
 148 }
 149
 150 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
 151 {
 152         if (new_mtu < 256 || new_mtu > IEEE80211_MAX_DATA_LEN)
 153                 return -EINVAL;
 154
 155         dev->mtu = new_mtu;
 156         return 0;
 157 }
 158
 159 static int ieee80211_verify_mac(struct ieee80211_sub_if_data *sdata, u8 *addr,
 160                                 bool check_dup)
 161 {
 162         struct ieee80211_local *local = sdata->local;
 163         struct ieee80211_sub_if_data *iter;
 164         u64 new, mask, tmp;
 165         u8 *m;
 166         int ret = 0;
 167
 168         if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
 169                 return 0;
 170
 171         m = addr;
 172         new =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 173                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 174                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 175
 176         m = local->hw.wiphy->addr_mask;
 177         mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 178                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 179                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 180
 181         if (!check_dup)
 182                 return ret;
 183
 184         mutex_lock(&local->iflist_mtx);
 185         list_for_each_entry(iter, &local->interfaces, list) {
 186                 if (iter == sdata)
 187                         continue;
 188
 189                 if (iter->vif.type == NL80211_IFTYPE_MONITOR &&
 190                     !(iter->u.mntr_flags & MONITOR_FLAG_ACTIVE))
 191                         continue;
 192
 193                 m = iter->vif.addr;
 194                 tmp =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 195                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 196                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 197
 198                 if ((new & ~mask) != (tmp & ~mask)) {
 199                         ret = -EINVAL;
 200                         break;
 201                 }
 202         }
 203         mutex_unlock(&local->iflist_mtx);
 204
 205         return ret;
 206 }
 207
 208 static int ieee80211_change_mac(struct net_device *dev, void *addr)
 209 {
 210         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 211         struct sockaddr *sa = addr;
 212         bool check_dup = true;
 213         int ret;
 214
 215         if (ieee80211_sdata_running(sdata))
 216                 return -EBUSY;
 217
 218         if (sdata->vif.type == NL80211_IFTYPE_MONITOR &&
 219             !(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE))
 220                 check_dup = false;
 221
 222         ret = ieee80211_verify_mac(sdata, sa->sa_data, check_dup);
 223         if (ret)
 224                 return ret;
 225
 226         ret = eth_mac_addr(dev, sa);
 227
 228         if (ret == 0)
 229                 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
 230
 231         return ret;
 232 }
 233
 234 static inline int identical_mac_addr_allowed(int type1, int type2)
 235 {
 236         return type1 == NL80211_IFTYPE_MONITOR ||
 237                 type2 == NL80211_IFTYPE_MONITOR ||
 238                 type1 == NL80211_IFTYPE_P2P_DEVICE ||
 239                 type2 == NL80211_IFTYPE_P2P_DEVICE ||
 240                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
 241                 (type1 == NL80211_IFTYPE_WDS &&
 242                         (type2 == NL80211_IFTYPE_WDS ||
 243                          type2 == NL80211_IFTYPE_AP)) ||
 244                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
 245                 (type1 == NL80211_IFTYPE_AP_VLAN &&
 246                         (type2 == NL80211_IFTYPE_AP ||
 247                          type2 == NL80211_IFTYPE_AP_VLAN));
 248 }
 249
 250 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
 251                                             enum nl80211_iftype iftype)
 252 {
 253         struct ieee80211_local *local = sdata->local;
 254         struct ieee80211_sub_if_data *nsdata;
 255         int ret;
 256
 257         ASSERT_RTNL();
 258
 259         /* we hold the RTNL here so can safely walk the list */
 260         list_for_each_entry(nsdata, &local->interfaces, list) {
 261                 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
 262                         /*
 263                          * Only OCB and monitor mode may coexist
 264                          */
 265                         if ((sdata->vif.type == NL80211_IFTYPE_OCB &&
 266                              nsdata->vif.type != NL80211_IFTYPE_MONITOR) ||
 267                             (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
 268                              nsdata->vif.type == NL80211_IFTYPE_OCB))
 269                                 return -EBUSY;
 270
 271                         /*
 272                          * Allow only a single IBSS interface to be up at any
 273                          * time. This is restricted because beacon distribution
 274                          * cannot work properly if both are in the same IBSS.
 275                          *
 276                          * To remove this restriction we'd have to disallow them
 277                          * from setting the same SSID on different IBSS interfaces
 278                          * belonging to the same hardware. Then, however, we're
 279                          * faced with having to adopt two different TSF timers...
 280                          */
 281                         if (iftype == NL80211_IFTYPE_ADHOC &&
 282                             nsdata->vif.type == NL80211_IFTYPE_ADHOC)
 283                                 return -EBUSY;
 284                         /*
 285                          * will not add another interface while any channel
 286                          * switch is active.
 287                          */
 288                         if (nsdata->vif.csa_active)
 289                                 return -EBUSY;
 290
 291                         /*
 292                          * The remaining checks are only performed for interfaces
 293                          * with the same MAC address.
 294                          */
 295                         if (!ether_addr_equal(sdata->vif.addr,
 296                                               nsdata->vif.addr))
 297                                 continue;
 298
 299                         /*
 300                          * check whether it may have the same address
 301                          */
 302                         if (!identical_mac_addr_allowed(iftype,
 303                                                         nsdata->vif.type))
 304                                 return -ENOTUNIQ;
 305
 306                         /*
 307                          * can only add VLANs to enabled APs
 308                          */
 309                         if (iftype == NL80211_IFTYPE_AP_VLAN &&
 310                             nsdata->vif.type == NL80211_IFTYPE_AP)
 311                                 sdata->bss = &nsdata->u.ap;
 312                 }
 313         }
 314
 315         mutex_lock(&local->chanctx_mtx);
 316         ret = ieee80211_check_combinations(sdata, NULL, 0, 0);
 317         mutex_unlock(&local->chanctx_mtx);
 318         return ret;
 319 }
 320
 321 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata,
 322                                   enum nl80211_iftype iftype)
 323 {
 324         int n_queues = sdata->local->hw.queues;
 325         int i;
 326
 327         if (iftype != NL80211_IFTYPE_P2P_DEVICE) {
 328                 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 329                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
 330                                          IEEE80211_INVAL_HW_QUEUE))
 331                                 return -EINVAL;
 332                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
 333                                          n_queues))
 334                                 return -EINVAL;
 335                 }
 336         }
 337
 338         if ((iftype != NL80211_IFTYPE_AP &&
 339              iftype != NL80211_IFTYPE_P2P_GO &&
 340              iftype != NL80211_IFTYPE_MESH_POINT) ||
 341             !(sdata->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)) {
 342                 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
 343                 return 0;
 344         }
 345
 346         if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
 347                 return -EINVAL;
 348
 349         if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
 350                 return -EINVAL;
 351
 352         return 0;
 353 }
 354
 355 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
 356                                     const int offset)
 357 {
 358         struct ieee80211_local *local = sdata->local;
 359         u32 flags = sdata->u.mntr_flags;
 360
 361 #define ADJUST(_f, _s)  do {                                    \
 362         if (flags & MONITOR_FLAG_##_f)                          \
 363                 local->fif_##_s += offset;                      \
 364         } while (0)
 365
 366         ADJUST(FCSFAIL, fcsfail);
 367         ADJUST(PLCPFAIL, plcpfail);
 368         ADJUST(CONTROL, control);
 369         ADJUST(CONTROL, pspoll);
 370         ADJUST(OTHER_BSS, other_bss);
 371
 372 #undef ADJUST
 373 }
 374
 375 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
 376 {
 377         struct ieee80211_local *local = sdata->local;
 378         int i;
 379
 380         for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 381                 if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
 382                         sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
 383                 else if (local->hw.queues >= IEEE80211_NUM_ACS)
 384                         sdata->vif.hw_queue[i] = i;
 385                 else
 386                         sdata->vif.hw_queue[i] = 0;
 387         }
 388         sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
 389 }
 390
 391 int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
 392 {
 393         struct ieee80211_sub_if_data *sdata;
 394         int ret;
 395
 396         if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
 397                 return 0;
 398
 399         ASSERT_RTNL();
 400
 401         if (local->monitor_sdata)
 402                 return 0;
 403
 404         sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
 405         if (!sdata)
 406                 return -ENOMEM;
 407
 408         /* set up data */
 409         sdata->local = local;
 410         sdata->vif.type = NL80211_IFTYPE_MONITOR;
 411         snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
 412                  wiphy_name(local->hw.wiphy));
 413         sdata->wdev.iftype = NL80211_IFTYPE_MONITOR;
 414
 415         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
 416
 417         ieee80211_set_default_queues(sdata);
 418
 419         ret = drv_add_interface(local, sdata);
 420         if (WARN_ON(ret)) {
 421                 /* ok .. stupid driver, it asked for this! */
 422                 kfree(sdata);
 423                 return ret;
 424         }
 425
 426         ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR);
 427         if (ret) {
 428                 kfree(sdata);
 429                 return ret;
 430         }
 431
 432         mutex_lock(&local->iflist_mtx);
 433         rcu_assign_pointer(local->monitor_sdata, sdata);
 434         mutex_unlock(&local->iflist_mtx);
 435
 436         mutex_lock(&local->mtx);
 437         ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef,
 438                                         IEEE80211_CHANCTX_EXCLUSIVE);
 439         mutex_unlock(&local->mtx);
 440         if (ret) {
 441                 mutex_lock(&local->iflist_mtx);
 442                 RCU_INIT_POINTER(local->monitor_sdata, NULL);
 443                 mutex_unlock(&local->iflist_mtx);
 444                 synchronize_net();
 445                 drv_remove_interface(local, sdata);
 446                 kfree(sdata);
 447                 return ret;
 448         }
 449
 450         return 0;
 451 }
 452
 453 void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
 454 {
 455         struct ieee80211_sub_if_data *sdata;
 456
 457         if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
 458                 return;
 459
 460         ASSERT_RTNL();
 461
 462         mutex_lock(&local->iflist_mtx);
 463
 464         sdata = rcu_dereference_protected(local->monitor_sdata,
 465                                           lockdep_is_held(&local->iflist_mtx));
 466         if (!sdata) {
 467                 mutex_unlock(&local->iflist_mtx);
 468                 return;
 469         }
 470
 471         RCU_INIT_POINTER(local->monitor_sdata, NULL);
 472         mutex_unlock(&local->iflist_mtx);
 473
 474         synchronize_net();
 475
 476         mutex_lock(&local->mtx);
 477         ieee80211_vif_release_channel(sdata);
 478         mutex_unlock(&local->mtx);
 479
 480         drv_remove_interface(local, sdata);
 481
 482         kfree(sdata);
 483 }
 484
 485 /*
 486  * NOTE: Be very careful when changing this function, it must NOT return
 487  * an error on interface type changes that have been pre-checked, so most
 488  * checks should be in ieee80211_check_concurrent_iface.
 489  */
 490 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
 491 {
 492         struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
 493         struct net_device *dev = wdev->netdev;
 494         struct ieee80211_local *local = sdata->local;
 495         struct sta_info *sta;
 496         u32 changed = 0;
 497         int res;
 498         u32 hw_reconf_flags = 0;
 499
 500         switch (sdata->vif.type) {
 501         case NL80211_IFTYPE_WDS:
 502                 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
 503                         return -ENOLINK;
 504                 break;
 505         case NL80211_IFTYPE_AP_VLAN: {
 506                 struct ieee80211_sub_if_data *master;
 507
 508                 if (!sdata->bss)
 509                         return -ENOLINK;
 510
 511                 mutex_lock(&local->mtx);
 512                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
 513                 mutex_unlock(&local->mtx);
 514
 515                 master = container_of(sdata->bss,
 516                                       struct ieee80211_sub_if_data, u.ap);
 517                 sdata->control_port_protocol =
 518                         master->control_port_protocol;
 519                 sdata->control_port_no_encrypt =
 520                         master->control_port_no_encrypt;
 521                 sdata->vif.cab_queue = master->vif.cab_queue;
 522                 memcpy(sdata->vif.hw_queue, master->vif.hw_queue,
 523                        sizeof(sdata->vif.hw_queue));
 524                 sdata->vif.bss_conf.chandef = master->vif.bss_conf.chandef;
 525                 break;
 526                 }
 527         case NL80211_IFTYPE_AP:
 528                 sdata->bss = &sdata->u.ap;
 529                 break;
 530         case NL80211_IFTYPE_MESH_POINT:
 531         case NL80211_IFTYPE_STATION:
 532         case NL80211_IFTYPE_MONITOR:
 533         case NL80211_IFTYPE_ADHOC:
 534         case NL80211_IFTYPE_P2P_DEVICE:
 535         case NL80211_IFTYPE_OCB:
 536                 /* no special treatment */
 537                 break;
 538         case NL80211_IFTYPE_UNSPECIFIED:
 539         case NUM_NL80211_IFTYPES:
 540         case NL80211_IFTYPE_P2P_CLIENT:
 541         case NL80211_IFTYPE_P2P_GO:
 542                 /* cannot happen */
 543                 WARN_ON(1);
 544                 break;
 545         }
 546
 547         if (local->open_count == 0) {
 548                 res = drv_start(local);
 549                 if (res)
 550                         goto err_del_bss;
 551                 /* we're brought up, everything changes */
 552                 hw_reconf_flags = ~0;
 553                 ieee80211_led_radio(local, true);
 554                 ieee80211_mod_tpt_led_trig(local,
 555                                            IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
 556         }
 557
 558         /*
 559          * Copy the hopefully now-present MAC address to
 560          * this interface, if it has the special null one.
 561          */
 562         if (dev && is_zero_ether_addr(dev->dev_addr)) {
 563                 memcpy(dev->dev_addr,
 564                        local->hw.wiphy->perm_addr,
 565                        ETH_ALEN);
 566                 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
 567
 568                 if (!is_valid_ether_addr(dev->dev_addr)) {
 569                         res = -EADDRNOTAVAIL;
 570                         goto err_stop;
 571                 }
 572         }
 573
 574         switch (sdata->vif.type) {
 575         case NL80211_IFTYPE_AP_VLAN:
 576                 /* no need to tell driver, but set carrier and chanctx */
 577                 if (rtnl_dereference(sdata->bss->beacon)) {
 578                         ieee80211_vif_vlan_copy_chanctx(sdata);
 579                         netif_carrier_on(dev);
 580                 } else {
 581                         netif_carrier_off(dev);
 582                 }
 583                 break;
 584         case NL80211_IFTYPE_MONITOR:
 585                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 586                         local->cooked_mntrs++;
 587                         break;
 588                 }
 589
 590                 if (sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE) {
 591                         res = drv_add_interface(local, sdata);
 592                         if (res)
 593                                 goto err_stop;
 594                 } else if (local->monitors == 0 && local->open_count == 0) {
 595                         res = ieee80211_add_virtual_monitor(local);
 596                         if (res)
 597                                 goto err_stop;
 598                 }
 599
 600                 /* must be before the call to ieee80211_configure_filter */
 601                 local->monitors++;
 602                 if (local->monitors == 1) {
 603                         local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
 604                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 605                 }
 606
 607                 ieee80211_adjust_monitor_flags(sdata, 1);
 608                 ieee80211_configure_filter(local);
 609                 mutex_lock(&local->mtx);
 610                 ieee80211_recalc_idle(local);
 611                 mutex_unlock(&local->mtx);
 612
 613                 netif_carrier_on(dev);
 614                 break;
 615         default:
 616                 if (coming_up) {
 617                         ieee80211_del_virtual_monitor(local);
 618
 619                         res = drv_add_interface(local, sdata);
 620                         if (res)
 621                                 goto err_stop;
 622                         res = ieee80211_check_queues(sdata,
 623                                 ieee80211_vif_type_p2p(&sdata->vif));
 624                         if (res)
 625                                 goto err_del_interface;
 626                 }
 627
 628                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
 629                         local->fif_pspoll++;
 630                         local->fif_probe_req++;
 631
 632                         ieee80211_configure_filter(local);
 633                 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 634                         local->fif_probe_req++;
 635                 }
 636
 637                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
 638                         changed |= ieee80211_reset_erp_info(sdata);
 639                 ieee80211_bss_info_change_notify(sdata, changed);
 640
 641                 switch (sdata->vif.type) {
 642                 case NL80211_IFTYPE_STATION:
 643                 case NL80211_IFTYPE_ADHOC:
 644                 case NL80211_IFTYPE_AP:
 645                 case NL80211_IFTYPE_MESH_POINT:
 646                 case NL80211_IFTYPE_OCB:
 647                         netif_carrier_off(dev);
 648                         break;
 649                 case NL80211_IFTYPE_WDS:
 650                 case NL80211_IFTYPE_P2P_DEVICE:
 651                         break;
 652                 default:
 653                         /* not reached */
 654                         WARN_ON(1);
 655                 }
 656
 657                 /*
 658                  * set default queue parameters so drivers don't
 659                  * need to initialise the hardware if the hardware
 660                  * doesn't start up with sane defaults
 661                  */
 662                 ieee80211_set_wmm_default(sdata, true);
 663         }
 664
 665         set_bit(SDATA_STATE_RUNNING, &sdata->state);
 666
 667         if (sdata->vif.type == NL80211_IFTYPE_WDS) {
 668                 /* Create STA entry for the WDS peer */
 669                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
 670                                      GFP_KERNEL);
 671                 if (!sta) {
 672                         res = -ENOMEM;
 673                         goto err_del_interface;
 674                 }
 675
 676                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
 677                 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
 678                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
 679
 680                 res = sta_info_insert(sta);
 681                 if (res) {
 682                         /* STA has been freed */
 683                         goto err_del_interface;
 684                 }
 685
 686                 rate_control_rate_init(sta);
 687                 netif_carrier_on(dev);
 688         } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
 689                 rcu_assign_pointer(local->p2p_sdata, sdata);
 690         }
 691
 692         /*
 693          * set_multicast_list will be invoked by the networking core
 694          * which will check whether any increments here were done in
 695          * error and sync them down to the hardware as filter flags.
 696          */
 697         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 698                 atomic_inc(&local->iff_allmultis);
 699
 700         if (coming_up)
 701                 local->open_count++;
 702
 703         if (hw_reconf_flags)
 704                 ieee80211_hw_config(local, hw_reconf_flags);
 705
 706         ieee80211_recalc_ps(local, -1);
 707
 708         if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
 709             sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 710                 /* XXX: for AP_VLAN, actually track AP queues */
 711                 netif_tx_start_all_queues(dev);
 712         } else if (dev) {
 713                 unsigned long flags;
 714                 int n_acs = IEEE80211_NUM_ACS;
 715                 int ac;
 716
 717                 if (local->hw.queues < IEEE80211_NUM_ACS)
 718                         n_acs = 1;
 719
 720                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 721                 if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE ||
 722                     (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 &&
 723                      skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) {
 724                         for (ac = 0; ac < n_acs; ac++) {
 725                                 int ac_queue = sdata->vif.hw_queue[ac];
 726
 727                                 if (local->queue_stop_reasons[ac_queue] == 0 &&
 728                                     skb_queue_empty(&local->pending[ac_queue]))
 729                                         netif_start_subqueue(dev, ac);
 730                         }
 731                 }
 732                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 733         }
 734
 735         return 0;
 736  err_del_interface:
 737         drv_remove_interface(local, sdata);
 738  err_stop:
 739         if (!local->open_count)
 740                 drv_stop(local);
 741  err_del_bss:
 742         sdata->bss = NULL;
 743         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 744                 mutex_lock(&local->mtx);
 745                 list_del(&sdata->u.vlan.list);
 746                 mutex_unlock(&local->mtx);
 747         }
 748         /* might already be clear but that doesn't matter */
 749         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 750         return res;
 751 }
 752
 753 static int ieee80211_open(struct net_device *dev)
 754 {
 755         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 756         int err;
 757
 758         /* fail early if user set an invalid address */
 759         if (!is_valid_ether_addr(dev->dev_addr))
 760                 return -EADDRNOTAVAIL;
 761
 762         err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
 763         if (err)
 764                 return err;
 765
 766         return ieee80211_do_open(&sdata->wdev, true);
 767 }
 768
 769 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
 770                               bool going_down)
 771 {
 772         struct ieee80211_local *local = sdata->local;
 773         unsigned long flags;
 774         struct sk_buff *skb, *tmp;
 775         u32 hw_reconf_flags = 0;
 776         int i, flushed;
 777         struct ps_data *ps;
 778         struct cfg80211_chan_def chandef;
 779         bool cancel_scan;
 780
 781         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 782
 783         cancel_scan = rcu_access_pointer(local->scan_sdata) == sdata;
 784         if (cancel_scan)
 785                 ieee80211_scan_cancel(local);
 786
 787         /*
 788          * Stop TX on this interface first.
 789          */
 790         if (sdata->dev)
 791                 netif_tx_stop_all_queues(sdata->dev);
 792
 793         ieee80211_roc_purge(local, sdata);
 794
 795         switch (sdata->vif.type) {
 796         case NL80211_IFTYPE_STATION:
 797                 ieee80211_mgd_stop(sdata);
 798                 break;
 799         case NL80211_IFTYPE_ADHOC:
 800                 ieee80211_ibss_stop(sdata);
 801                 break;
 802         case NL80211_IFTYPE_AP:
 803                 cancel_work_sync(&sdata->u.ap.request_smps_work);
 804                 break;
 805         default:
 806                 break;
 807         }
 808
 809         /*
 810          * Remove all stations associated with this interface.
 811          *
 812          * This must be done before calling ops->remove_interface()
 813          * because otherwise we can later invoke ops->sta_notify()
 814          * whenever the STAs are removed, and that invalidates driver
 815          * assumptions about always getting a vif pointer that is valid
 816          * (because if we remove a STA after ops->remove_interface()
 817          * the driver will have removed the vif info already!)
 818          *
 819          * This is relevant only in WDS mode, in all other modes we've
 820          * already removed all stations when disconnecting or similar,
 821          * so warn otherwise.
 822          */
 823         flushed = sta_info_flush(sdata);
 824         WARN_ON_ONCE((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) ||
 825                      (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1));
 826
 827         /* don't count this interface for allmulti while it is down */
 828         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 829                 atomic_dec(&local->iff_allmultis);
 830
 831         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 832                 local->fif_pspoll--;
 833                 local->fif_probe_req--;
 834         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 835                 local->fif_probe_req--;
 836         }
 837
 838         if (sdata->dev) {
 839                 netif_addr_lock_bh(sdata->dev);
 840                 spin_lock_bh(&local->filter_lock);
 841                 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
 842                                  sdata->dev->addr_len);
 843                 spin_unlock_bh(&local->filter_lock);
 844                 netif_addr_unlock_bh(sdata->dev);
 845         }
 846
 847         del_timer_sync(&local->dynamic_ps_timer);
 848         cancel_work_sync(&local->dynamic_ps_enable_work);
 849
 850         cancel_work_sync(&sdata->recalc_smps);
 851         sdata_lock(sdata);
 852         mutex_lock(&local->mtx);
 853         sdata->vif.csa_active = false;
 854         if (sdata->vif.type == NL80211_IFTYPE_STATION)
 855                 sdata->u.mgd.csa_waiting_bcn = false;
 856         if (sdata->csa_block_tx) {
 857                 ieee80211_wake_vif_queues(local, sdata,
 858                                           IEEE80211_QUEUE_STOP_REASON_CSA);
 859                 sdata->csa_block_tx = false;
 860         }
 861         mutex_unlock(&local->mtx);
 862         sdata_unlock(sdata);
 863
 864         cancel_work_sync(&sdata->csa_finalize_work);
 865
 866         cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
 867
 868         if (sdata->wdev.cac_started) {
 869                 chandef = sdata->vif.bss_conf.chandef;
 870                 WARN_ON(local->suspended);
 871                 mutex_lock(&local->mtx);
 872                 ieee80211_vif_release_channel(sdata);
 873                 mutex_unlock(&local->mtx);
 874                 cfg80211_cac_event(sdata->dev, &chandef,
 875                                    NL80211_RADAR_CAC_ABORTED,
 876                                    GFP_KERNEL);
 877         }
 878
 879         /* APs need special treatment */
 880         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 881                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
 882
 883                 /* down all dependent devices, that is VLANs */
 884                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
 885                                          u.vlan.list)
 886                         dev_close(vlan->dev);
 887                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
 888         } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 889                 /* remove all packets in parent bc_buf pointing to this dev */
 890                 ps = &sdata->bss->ps;
 891
 892                 spin_lock_irqsave(&ps->bc_buf.lock, flags);
 893                 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
 894                         if (skb->dev == sdata->dev) {
 895                                 __skb_unlink(skb, &ps->bc_buf);
 896                                 local->total_ps_buffered--;
 897                                 ieee80211_free_txskb(&local->hw, skb);
 898                         }
 899                 }
 900                 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
 901         }
 902
 903         if (going_down)
 904                 local->open_count--;
 905
 906         switch (sdata->vif.type) {
 907         case NL80211_IFTYPE_AP_VLAN:
 908                 mutex_lock(&local->mtx);
 909                 list_del(&sdata->u.vlan.list);
 910                 mutex_unlock(&local->mtx);
 911                 RCU_INIT_POINTER(sdata->vif.chanctx_conf, NULL);
 912                 /* see comment in the default case below */
 913                 ieee80211_free_keys(sdata, true);
 914                 /* no need to tell driver */
 915                 break;
 916         case NL80211_IFTYPE_MONITOR:
 917                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 918                         local->cooked_mntrs--;
 919                         break;
 920                 }
 921
 922                 local->monitors--;
 923                 if (local->monitors == 0) {
 924                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
 925                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 926                 }
 927
 928                 ieee80211_adjust_monitor_flags(sdata, -1);
 929                 break;
 930         case NL80211_IFTYPE_P2P_DEVICE:
 931                 /* relies on synchronize_rcu() below */
 932                 RCU_INIT_POINTER(local->p2p_sdata, NULL);
 933                 /* fall through */
 934         default:
 935                 cancel_work_sync(&sdata->work);
 936                 /*
 937                  * When we get here, the interface is marked down.
 938                  * Free the remaining keys, if there are any
 939                  * (which can happen in AP mode if userspace sets
 940                  * keys before the interface is operating, and maybe
 941                  * also in WDS mode)
 942                  *
 943                  * Force the key freeing to always synchronize_net()
 944                  * to wait for the RX path in case it is using this
 945                  * interface enqueuing frames at this very time on
 946                  * another CPU.
 947                  */
 948                 ieee80211_free_keys(sdata, true);
 949                 skb_queue_purge(&sdata->skb_queue);
 950         }
 951
 952         sdata->bss = NULL;
 953
 954         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 955         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 956                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
 957                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 958                         if (info->control.vif == &sdata->vif) {
 959                                 __skb_unlink(skb, &local->pending[i]);
 960                                 ieee80211_free_txskb(&local->hw, skb);
 961                         }
 962                 }
 963         }
 964         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 965
 966         if (sdata->vif.txq) {
 967                 struct txq_info *txqi = to_txq_info(sdata->vif.txq);
 968
 969                 ieee80211_purge_tx_queue(&local->hw, &txqi->queue);
 970                 atomic_set(&sdata->txqs_len[txqi->txq.ac], 0);
 971         }
 972
 973         if (local->open_count == 0)
 974                 ieee80211_clear_tx_pending(local);
 975
 976         /*
 977          * If the interface goes down while suspended, presumably because
 978          * the device was unplugged and that happens before our resume,
 979          * then the driver is already unconfigured and the remainder of
 980          * this function isn't needed.
 981          * XXX: what about WoWLAN? If the device has software state, e.g.
 982          *      memory allocated, it might expect teardown commands from
 983          *      mac80211 here?
 984          */
 985         if (local->suspended) {
 986                 WARN_ON(local->wowlan);
 987                 WARN_ON(rtnl_dereference(local->monitor_sdata));
 988                 return;
 989         }
 990
 991         switch (sdata->vif.type) {
 992         case NL80211_IFTYPE_AP_VLAN:
 993                 break;
 994         case NL80211_IFTYPE_MONITOR:
 995                 if (local->monitors == 0)
 996                         ieee80211_del_virtual_monitor(local);
 997
 998                 mutex_lock(&local->mtx);
 999                 ieee80211_recalc_idle(local);
1000                 mutex_unlock(&local->mtx);
1001
1002                 if (!(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE))
1003                         break;
1004
1005                 /* fall through */
1006         default:
1007                 if (going_down)
1008                         drv_remove_interface(local, sdata);
1009         }
1010
1011         ieee80211_recalc_ps(local, -1);
1012
1013         if (cancel_scan)
1014                 flush_delayed_work(&local->scan_work);
1015
1016         if (local->open_count == 0) {
1017                 ieee80211_stop_device(local);
1018
1019                 /* no reconfiguring after stop! */
1020                 return;
1021         }
1022
1023         /* do after stop to avoid reconfiguring when we stop anyway */
1024         ieee80211_configure_filter(local);
1025         ieee80211_hw_config(local, hw_reconf_flags);
1026
1027         if (local->monitors == local->open_count)
1028                 ieee80211_add_virtual_monitor(local);
1029 }
1030
1031 static int ieee80211_stop(struct net_device *dev)
1032 {
1033         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1034
1035         ieee80211_do_stop(sdata, true);
1036
1037         return 0;
1038 }
1039
1040 static void ieee80211_set_multicast_list(struct net_device *dev)
1041 {
1042         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1043         struct ieee80211_local *local = sdata->local;
1044         int allmulti, sdata_allmulti;
1045
1046         allmulti = !!(dev->flags & IFF_ALLMULTI);
1047         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
1048
1049         if (allmulti != sdata_allmulti) {
1050                 if (dev->flags & IFF_ALLMULTI)
1051                         atomic_inc(&local->iff_allmultis);
1052                 else
1053                         atomic_dec(&local->iff_allmultis);
1054                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
1055         }
1056
1057         spin_lock_bh(&local->filter_lock);
1058         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
1059         spin_unlock_bh(&local->filter_lock);
1060         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
1061 }
1062
1063 /*
1064  * Called when the netdev is removed or, by the code below, before
1065  * the interface type changes.
1066  */
1067 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
1068 {
1069         int i;
1070
1071         /* free extra data */
1072         ieee80211_free_keys(sdata, false);
1073
1074         ieee80211_debugfs_remove_netdev(sdata);
1075
1076         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1077                 __skb_queue_purge(&sdata->fragments[i].skb_list);
1078         sdata->fragment_next = 0;
1079
1080         if (ieee80211_vif_is_mesh(&sdata->vif))
1081                 mesh_rmc_free(sdata);
1082 }
1083
1084 static void ieee80211_uninit(struct net_device *dev)
1085 {
1086         ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
1087 }
1088
1089 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
1090                                          struct sk_buff *skb,
1091                                          void *accel_priv,
1092                                          select_queue_fallback_t fallback)
1093 {
1094         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
1095 }
1096
1097 static struct rtnl_link_stats64 *
1098 ieee80211_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
1099 {
1100         int i;
1101
1102         for_each_possible_cpu(i) {
1103                 const struct pcpu_sw_netstats *tstats;
1104                 u64 rx_packets, rx_bytes, tx_packets, tx_bytes;
1105                 unsigned int start;
1106
1107                 tstats = per_cpu_ptr(dev->tstats, i);
1108
1109                 do {
1110                         start = u64_stats_fetch_begin_irq(&tstats->syncp);
1111                         rx_packets = tstats->rx_packets;
1112                         tx_packets = tstats->tx_packets;
1113                         rx_bytes = tstats->rx_bytes;
1114                         tx_bytes = tstats->tx_bytes;
1115                 } while (u64_stats_fetch_retry_irq(&tstats->syncp, start));
1116
1117                 stats->rx_packets += rx_packets;
1118                 stats->tx_packets += tx_packets;
1119                 stats->rx_bytes   += rx_bytes;
1120                 stats->tx_bytes   += tx_bytes;
1121         }
1122
1123         return stats;
1124 }
1125
1126 static const struct net_device_ops ieee80211_dataif_ops = {
1127         .ndo_open               = ieee80211_open,
1128         .ndo_stop               = ieee80211_stop,
1129         .ndo_uninit             = ieee80211_uninit,
1130         .ndo_start_xmit         = ieee80211_subif_start_xmit,
1131         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1132         .ndo_change_mtu         = ieee80211_change_mtu,
1133         .ndo_set_mac_address    = ieee80211_change_mac,
1134         .ndo_select_queue       = ieee80211_netdev_select_queue,
1135         .ndo_get_stats64        = ieee80211_get_stats64,
1136 };
1137
1138 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
1139                                           struct sk_buff *skb,
1140                                           void *accel_priv,
1141                                           select_queue_fallback_t fallback)
1142 {
1143         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1144         struct ieee80211_local *local = sdata->local;
1145         struct ieee80211_hdr *hdr;
1146         struct ieee80211_radiotap_header *rtap = (void *)skb->data;
1147
1148         if (local->hw.queues < IEEE80211_NUM_ACS)
1149                 return 0;
1150
1151         if (skb->len < 4 ||
1152             skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
1153                 return 0; /* doesn't matter, frame will be dropped */
1154
1155         hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
1156
1157         return ieee80211_select_queue_80211(sdata, skb, hdr);
1158 }
1159
1160 static const struct net_device_ops ieee80211_monitorif_ops = {
1161         .ndo_open               = ieee80211_open,
1162         .ndo_stop               = ieee80211_stop,
1163         .ndo_uninit             = ieee80211_uninit,
1164         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
1165         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1166         .ndo_change_mtu         = ieee80211_change_mtu,
1167         .ndo_set_mac_address    = ieee80211_change_mac,
1168         .ndo_select_queue       = ieee80211_monitor_select_queue,
1169         .ndo_get_stats64        = ieee80211_get_stats64,
1170 };
1171
1172 static void ieee80211_if_free(struct net_device *dev)
1173 {
1174         free_percpu(dev->tstats);
1175         free_netdev(dev);
1176 }
1177
1178 static void ieee80211_if_setup(struct net_device *dev)
1179 {
1180         ether_setup(dev);
1181         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1182         dev->netdev_ops = &ieee80211_dataif_ops;
1183         dev->destructor = ieee80211_if_free;
1184 }
1185
1186 static void ieee80211_iface_work(struct work_struct *work)
1187 {
1188         struct ieee80211_sub_if_data *sdata =
1189                 container_of(work, struct ieee80211_sub_if_data, work);
1190         struct ieee80211_local *local = sdata->local;
1191         struct sk_buff *skb;
1192         struct sta_info *sta;
1193         struct ieee80211_ra_tid *ra_tid;
1194         struct ieee80211_rx_agg *rx_agg;
1195
1196         if (!ieee80211_sdata_running(sdata))
1197                 return;
1198
1199         if (local->scanning)
1200                 return;
1201
1202         if (!ieee80211_can_run_worker(local))
1203                 return;
1204
1205         /* first process frames */
1206         while ((skb = skb_dequeue(&sdata->skb_queue))) {
1207                 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1208
1209                 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
1210                         ra_tid = (void *)&skb->cb;
1211                         ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
1212                                                  ra_tid->tid);
1213                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
1214                         ra_tid = (void *)&skb->cb;
1215                         ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
1216                                                 ra_tid->tid);
1217                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_RX_AGG_START) {
1218                         rx_agg = (void *)&skb->cb;
1219                         mutex_lock(&local->sta_mtx);
1220                         sta = sta_info_get_bss(sdata, rx_agg->addr);
1221                         if (sta)
1222                                 __ieee80211_start_rx_ba_session(sta,
1223                                                 0, 0, 0, 1, rx_agg->tid,
1224                                                 IEEE80211_MAX_AMPDU_BUF,
1225                                                 false, true);
1226                         mutex_unlock(&local->sta_mtx);
1227                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_RX_AGG_STOP) {
1228                         rx_agg = (void *)&skb->cb;
1229                         mutex_lock(&local->sta_mtx);
1230                         sta = sta_info_get_bss(sdata, rx_agg->addr);
1231                         if (sta)
1232                                 __ieee80211_stop_rx_ba_session(sta,
1233                                                         rx_agg->tid,
1234                                                         WLAN_BACK_RECIPIENT, 0,
1235                                                         false);
1236                         mutex_unlock(&local->sta_mtx);
1237                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_TDLS_CHSW) {
1238                         ieee80211_process_tdls_channel_switch(sdata, skb);
1239                 } else if (ieee80211_is_action(mgmt->frame_control) &&
1240                            mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1241                         int len = skb->len;
1242
1243                         mutex_lock(&local->sta_mtx);
1244                         sta = sta_info_get_bss(sdata, mgmt->sa);
1245                         if (sta) {
1246                                 switch (mgmt->u.action.u.addba_req.action_code) {
1247                                 case WLAN_ACTION_ADDBA_REQ:
1248                                         ieee80211_process_addba_request(
1249                                                         local, sta, mgmt, len);
1250                                         break;
1251                                 case WLAN_ACTION_ADDBA_RESP:
1252                                         ieee80211_process_addba_resp(local, sta,
1253                                                                      mgmt, len);
1254                                         break;
1255                                 case WLAN_ACTION_DELBA:
1256                                         ieee80211_process_delba(sdata, sta,
1257                                                                 mgmt, len);
1258                                         break;
1259                                 default:
1260                                         WARN_ON(1);
1261                                         break;
1262                                 }
1263                         }
1264                         mutex_unlock(&local->sta_mtx);
1265                 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1266                         struct ieee80211_hdr *hdr = (void *)mgmt;
1267                         /*
1268                          * So the frame isn't mgmt, but frame_control
1269                          * is at the right place anyway, of course, so
1270                          * the if statement is correct.
1271                          *
1272                          * Warn if we have other data frame types here,
1273                          * they must not get here.
1274                          */
1275                         WARN_ON(hdr->frame_control &
1276                                         cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1277                         WARN_ON(!(hdr->seq_ctrl &
1278                                         cpu_to_le16(IEEE80211_SCTL_FRAG)));
1279                         /*
1280                          * This was a fragment of a frame, received while
1281                          * a block-ack session was active. That cannot be
1282                          * right, so terminate the session.
1283                          */
1284                         mutex_lock(&local->sta_mtx);
1285                         sta = sta_info_get_bss(sdata, mgmt->sa);
1286                         if (sta) {
1287                                 u16 tid = *ieee80211_get_qos_ctl(hdr) &
1288                                                 IEEE80211_QOS_CTL_TID_MASK;
1289
1290                                 __ieee80211_stop_rx_ba_session(
1291                                         sta, tid, WLAN_BACK_RECIPIENT,
1292                                         WLAN_REASON_QSTA_REQUIRE_SETUP,
1293                                         true);
1294                         }
1295                         mutex_unlock(&local->sta_mtx);
1296                 } else switch (sdata->vif.type) {
1297                 case NL80211_IFTYPE_STATION:
1298                         ieee80211_sta_rx_queued_mgmt(sdata, skb);
1299                         break;
1300                 case NL80211_IFTYPE_ADHOC:
1301                         ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1302                         break;
1303                 case NL80211_IFTYPE_MESH_POINT:
1304                         if (!ieee80211_vif_is_mesh(&sdata->vif))
1305                                 break;
1306                         ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1307                         break;
1308                 default:
1309                         WARN(1, "frame for unexpected interface type");
1310                         break;
1311                 }
1312
1313                 kfree_skb(skb);
1314         }
1315
1316         /* then other type-dependent work */
1317         switch (sdata->vif.type) {
1318         case NL80211_IFTYPE_STATION:
1319                 ieee80211_sta_work(sdata);
1320                 break;
1321         case NL80211_IFTYPE_ADHOC:
1322                 ieee80211_ibss_work(sdata);
1323                 break;
1324         case NL80211_IFTYPE_MESH_POINT:
1325                 if (!ieee80211_vif_is_mesh(&sdata->vif))
1326                         break;
1327                 ieee80211_mesh_work(sdata);
1328                 break;
1329         case NL80211_IFTYPE_OCB:
1330                 ieee80211_ocb_work(sdata);
1331                 break;
1332         default:
1333                 break;
1334         }
1335 }
1336
1337 static void ieee80211_recalc_smps_work(struct work_struct *work)
1338 {
1339         struct ieee80211_sub_if_data *sdata =
1340                 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1341
1342         ieee80211_recalc_smps(sdata);
1343 }
1344
1345 /*
1346  * Helper function to initialise an interface to a specific type.
1347  */
1348 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1349                                   enum nl80211_iftype type)
1350 {
1351         static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff,
1352                                                     0xff, 0xff, 0xff};
1353
1354         /* clear type-dependent union */
1355         memset(&sdata->u, 0, sizeof(sdata->u));
1356
1357         /* and set some type-dependent values */
1358         sdata->vif.type = type;
1359         sdata->vif.p2p = false;
1360         sdata->wdev.iftype = type;
1361
1362         sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1363         sdata->control_port_no_encrypt = false;
1364         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1365         sdata->vif.bss_conf.idle = true;
1366
1367         sdata->noack_map = 0;
1368
1369         /* only monitor/p2p-device differ */
1370         if (sdata->dev) {
1371                 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1372                 sdata->dev->type = ARPHRD_ETHER;
1373         }
1374
1375         skb_queue_head_init(&sdata->skb_queue);
1376         INIT_WORK(&sdata->work, ieee80211_iface_work);
1377         INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1378         INIT_WORK(&sdata->csa_finalize_work, ieee80211_csa_finalize_work);
1379         INIT_LIST_HEAD(&sdata->assigned_chanctx_list);
1380         INIT_LIST_HEAD(&sdata->reserved_chanctx_list);
1381
1382         switch (type) {
1383         case NL80211_IFTYPE_P2P_GO:
1384                 type = NL80211_IFTYPE_AP;
1385                 sdata->vif.type = type;
1386                 sdata->vif.p2p = true;
1387                 /* fall through */
1388         case NL80211_IFTYPE_AP:
1389                 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1390                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1391                 INIT_WORK(&sdata->u.ap.request_smps_work,
1392                           ieee80211_request_smps_ap_work);
1393                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1394                 sdata->u.ap.req_smps = IEEE80211_SMPS_OFF;
1395                 break;
1396         case NL80211_IFTYPE_P2P_CLIENT:
1397                 type = NL80211_IFTYPE_STATION;
1398                 sdata->vif.type = type;
1399                 sdata->vif.p2p = true;
1400                 /* fall through */
1401         case NL80211_IFTYPE_STATION:
1402                 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1403                 ieee80211_sta_setup_sdata(sdata);
1404                 break;
1405         case NL80211_IFTYPE_OCB:
1406                 sdata->vif.bss_conf.bssid = bssid_wildcard;
1407                 ieee80211_ocb_setup_sdata(sdata);
1408                 break;
1409         case NL80211_IFTYPE_ADHOC:
1410                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1411                 ieee80211_ibss_setup_sdata(sdata);
1412                 break;
1413         case NL80211_IFTYPE_MESH_POINT:
1414                 if (ieee80211_vif_is_mesh(&sdata->vif))
1415                         ieee80211_mesh_init_sdata(sdata);
1416                 break;
1417         case NL80211_IFTYPE_MONITOR:
1418                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1419                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1420                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
1421                                       MONITOR_FLAG_OTHER_BSS;
1422                 break;
1423         case NL80211_IFTYPE_WDS:
1424                 sdata->vif.bss_conf.bssid = NULL;
1425                 break;
1426         case NL80211_IFTYPE_AP_VLAN:
1427         case NL80211_IFTYPE_P2P_DEVICE:
1428                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1429                 break;
1430         case NL80211_IFTYPE_UNSPECIFIED:
1431         case NUM_NL80211_IFTYPES:
1432                 BUG();
1433                 break;
1434         }
1435
1436         ieee80211_debugfs_add_netdev(sdata);
1437 }
1438
1439 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1440                                            enum nl80211_iftype type)
1441 {
1442         struct ieee80211_local *local = sdata->local;
1443         int ret, err;
1444         enum nl80211_iftype internal_type = type;
1445         bool p2p = false;
1446
1447         ASSERT_RTNL();
1448
1449         if (!local->ops->change_interface)
1450                 return -EBUSY;
1451
1452         switch (sdata->vif.type) {
1453         case NL80211_IFTYPE_AP:
1454         case NL80211_IFTYPE_STATION:
1455         case NL80211_IFTYPE_ADHOC:
1456         case NL80211_IFTYPE_OCB:
1457                 /*
1458                  * Could maybe also all others here?
1459                  * Just not sure how that interacts
1460                  * with the RX/config path e.g. for
1461                  * mesh.
1462                  */
1463                 break;
1464         default:
1465                 return -EBUSY;
1466         }
1467
1468         switch (type) {
1469         case NL80211_IFTYPE_AP:
1470         case NL80211_IFTYPE_STATION:
1471         case NL80211_IFTYPE_ADHOC:
1472         case NL80211_IFTYPE_OCB:
1473                 /*
1474                  * Could probably support everything
1475                  * but WDS here (WDS do_open can fail
1476                  * under memory pressure, which this
1477                  * code isn't prepared to handle).
1478                  */
1479                 break;
1480         case NL80211_IFTYPE_P2P_CLIENT:
1481                 p2p = true;
1482                 internal_type = NL80211_IFTYPE_STATION;
1483                 break;
1484         case NL80211_IFTYPE_P2P_GO:
1485                 p2p = true;
1486                 internal_type = NL80211_IFTYPE_AP;
1487                 break;
1488         default:
1489                 return -EBUSY;
1490         }
1491
1492         ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1493         if (ret)
1494                 return ret;
1495
1496         ieee80211_do_stop(sdata, false);
1497
1498         ieee80211_teardown_sdata(sdata);
1499
1500         ret = drv_change_interface(local, sdata, internal_type, p2p);
1501         if (ret)
1502                 type = ieee80211_vif_type_p2p(&sdata->vif);
1503
1504         /*
1505          * Ignore return value here, there's not much we can do since
1506          * the driver changed the interface type internally already.
1507          * The warnings will hopefully make driver authors fix it :-)
1508          */
1509         ieee80211_check_queues(sdata, type);
1510
1511         ieee80211_setup_sdata(sdata, type);
1512
1513         err = ieee80211_do_open(&sdata->wdev, false);
1514         WARN(err, "type change: do_open returned %d", err);
1515
1516         return ret;
1517 }
1518
1519 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1520                              enum nl80211_iftype type)
1521 {
1522         int ret;
1523
1524         ASSERT_RTNL();
1525
1526         if (type == ieee80211_vif_type_p2p(&sdata->vif))
1527                 return 0;
1528
1529         if (ieee80211_sdata_running(sdata)) {
1530                 ret = ieee80211_runtime_change_iftype(sdata, type);
1531                 if (ret)
1532                         return ret;
1533         } else {
1534                 /* Purge and reset type-dependent state. */
1535                 ieee80211_teardown_sdata(sdata);
1536                 ieee80211_setup_sdata(sdata, type);
1537         }
1538
1539         /* reset some values that shouldn't be kept across type changes */
1540         if (type == NL80211_IFTYPE_STATION)
1541                 sdata->u.mgd.use_4addr = false;
1542
1543         return 0;
1544 }
1545
1546 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1547                                        u8 *perm_addr, enum nl80211_iftype type)
1548 {
1549         struct ieee80211_sub_if_data *sdata;
1550         u64 mask, start, addr, val, inc;
1551         u8 *m;
1552         u8 tmp_addr[ETH_ALEN];
1553         int i;
1554
1555         /* default ... something at least */
1556         memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1557
1558         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1559             local->hw.wiphy->n_addresses <= 1)
1560                 return;
1561
1562         mutex_lock(&local->iflist_mtx);
1563
1564         switch (type) {
1565         case NL80211_IFTYPE_MONITOR:
1566                 /* doesn't matter */
1567                 break;
1568         case NL80211_IFTYPE_WDS:
1569         case NL80211_IFTYPE_AP_VLAN:
1570                 /* match up with an AP interface */
1571                 list_for_each_entry(sdata, &local->interfaces, list) {
1572                         if (sdata->vif.type != NL80211_IFTYPE_AP)
1573                                 continue;
1574                         memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1575                         break;
1576                 }
1577                 /* keep default if no AP interface present */
1578                 break;
1579         case NL80211_IFTYPE_P2P_CLIENT:
1580         case NL80211_IFTYPE_P2P_GO:
1581                 if (local->hw.flags & IEEE80211_HW_P2P_DEV_ADDR_FOR_INTF) {
1582                         list_for_each_entry(sdata, &local->interfaces, list) {
1583                                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1584                                         continue;
1585                                 if (!ieee80211_sdata_running(sdata))
1586                                         continue;
1587                                 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1588                                 goto out_unlock;
1589                         }
1590                 }
1591                 /* otherwise fall through */
1592         default:
1593                 /* assign a new address if possible -- try n_addresses first */
1594                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1595                         bool used = false;
1596
1597                         list_for_each_entry(sdata, &local->interfaces, list) {
1598                                 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr,
1599                                                      sdata->vif.addr)) {
1600                                         used = true;
1601                                         break;
1602                                 }
1603                         }
1604
1605                         if (!used) {
1606                                 memcpy(perm_addr,
1607                                        local->hw.wiphy->addresses[i].addr,
1608                                        ETH_ALEN);
1609                                 break;
1610                         }
1611                 }
1612
1613                 /* try mask if available */
1614                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1615                         break;
1616
1617                 m = local->hw.wiphy->addr_mask;
1618                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1619                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1620                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1621
1622                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1623                         /* not a contiguous mask ... not handled now! */
1624                         pr_info("not contiguous\n");
1625                         break;
1626                 }
1627
1628                 /*
1629                  * Pick address of existing interface in case user changed
1630                  * MAC address manually, default to perm_addr.
1631                  */
1632                 m = local->hw.wiphy->perm_addr;
1633                 list_for_each_entry(sdata, &local->interfaces, list) {
1634                         if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
1635                                 continue;
1636                         m = sdata->vif.addr;
1637                         break;
1638                 }
1639                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1640                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1641                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1642
1643                 inc = 1ULL<<__ffs64(mask);
1644                 val = (start & mask);
1645                 addr = (start & ~mask) | (val & mask);
1646                 do {
1647                         bool used = false;
1648
1649                         tmp_addr[5] = addr >> 0*8;
1650                         tmp_addr[4] = addr >> 1*8;
1651                         tmp_addr[3] = addr >> 2*8;
1652                         tmp_addr[2] = addr >> 3*8;
1653                         tmp_addr[1] = addr >> 4*8;
1654                         tmp_addr[0] = addr >> 5*8;
1655
1656                         val += inc;
1657
1658                         list_for_each_entry(sdata, &local->interfaces, list) {
1659                                 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) {
1660                                         used = true;
1661                                         break;
1662                                 }
1663                         }
1664
1665                         if (!used) {
1666                                 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1667                                 break;
1668                         }
1669                         addr = (start & ~mask) | (val & mask);
1670                 } while (addr != start);
1671
1672                 break;
1673         }
1674
1675  out_unlock:
1676         mutex_unlock(&local->iflist_mtx);
1677 }
1678
1679 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1680                      unsigned char name_assign_type,
1681                      struct wireless_dev **new_wdev, enum nl80211_iftype type,
1682                      struct vif_params *params)
1683 {
1684         struct net_device *ndev = NULL;
1685         struct ieee80211_sub_if_data *sdata = NULL;
1686         struct txq_info *txqi;
1687         int ret, i;
1688         int txqs = 1;
1689
1690         ASSERT_RTNL();
1691
1692         if (type == NL80211_IFTYPE_P2P_DEVICE) {
1693                 struct wireless_dev *wdev;
1694
1695                 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1696                                 GFP_KERNEL);
1697                 if (!sdata)
1698                         return -ENOMEM;
1699                 wdev = &sdata->wdev;
1700
1701                 sdata->dev = NULL;
1702                 strlcpy(sdata->name, name, IFNAMSIZ);
1703                 ieee80211_assign_perm_addr(local, wdev->address, type);
1704                 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1705         } else {
1706                 int size = ALIGN(sizeof(*sdata) + local->hw.vif_data_size,
1707                                  sizeof(void *));
1708                 int txq_size = 0;
1709
1710                 if (local->ops->wake_tx_queue)
1711                         txq_size += sizeof(struct txq_info) +
1712                                     local->hw.txq_data_size;
1713
1714                 if (local->hw.queues >= IEEE80211_NUM_ACS)
1715                         txqs = IEEE80211_NUM_ACS;
1716
1717                 ndev = alloc_netdev_mqs(size + txq_size,
1718                                         name, name_assign_type,
1719                                         ieee80211_if_setup, txqs, 1);
1720                 if (!ndev)
1721                         return -ENOMEM;
1722                 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1723
1724                 ndev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1725                 if (!ndev->tstats) {
1726                         free_netdev(ndev);
1727                         return -ENOMEM;
1728                 }
1729
1730                 ndev->needed_headroom = local->tx_headroom +
1731                                         4*6 /* four MAC addresses */
1732                                         + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1733                                         + 6 /* mesh */
1734                                         + 8 /* rfc1042/bridge tunnel */
1735                                         - ETH_HLEN /* ethernet hard_header_len */
1736                                         + IEEE80211_ENCRYPT_HEADROOM;
1737                 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1738
1739                 ret = dev_alloc_name(ndev, ndev->name);
1740                 if (ret < 0) {
1741                         free_netdev(ndev);
1742                         return ret;
1743                 }
1744
1745                 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1746                 if (params && is_valid_ether_addr(params->macaddr))
1747                         memcpy(ndev->dev_addr, params->macaddr, ETH_ALEN);
1748                 else
1749                         memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1750                 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1751
1752                 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1753                 sdata = netdev_priv(ndev);
1754                 ndev->ieee80211_ptr = &sdata->wdev;
1755                 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1756                 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1757
1758                 if (txq_size) {
1759                         txqi = netdev_priv(ndev) + size;
1760                         ieee80211_init_tx_queue(sdata, NULL, txqi, 0);
1761                 }
1762
1763                 sdata->dev = ndev;
1764         }
1765
1766         /* initialise type-independent data */
1767         sdata->wdev.wiphy = local->hw.wiphy;
1768         sdata->local = local;
1769
1770         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1771                 skb_queue_head_init(&sdata->fragments[i].skb_list);
1772
1773         INIT_LIST_HEAD(&sdata->key_list);
1774
1775         INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
1776                           ieee80211_dfs_cac_timer_work);
1777         INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
1778                           ieee80211_delayed_tailroom_dec);
1779
1780         for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1781                 struct ieee80211_supported_band *sband;
1782                 sband = local->hw.wiphy->bands[i];
1783                 sdata->rc_rateidx_mask[i] =
1784                         sband ? (1 << sband->n_bitrates) - 1 : 0;
1785                 if (sband)
1786                         memcpy(sdata->rc_rateidx_mcs_mask[i],
1787                                sband->ht_cap.mcs.rx_mask,
1788                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1789                 else
1790                         memset(sdata->rc_rateidx_mcs_mask[i], 0,
1791                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1792         }
1793
1794         ieee80211_set_default_queues(sdata);
1795
1796         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1797         sdata->user_power_level = local->user_power_level;
1798
1799         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1800
1801         /* setup type-dependent data */
1802         ieee80211_setup_sdata(sdata, type);
1803
1804         if (ndev) {
1805                 if (params) {
1806                         ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1807                         if (type == NL80211_IFTYPE_STATION)
1808                                 sdata->u.mgd.use_4addr = params->use_4addr;
1809                 }
1810
1811                 ndev->features |= local->hw.netdev_features;
1812
1813                 netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops);
1814
1815                 ret = register_netdevice(ndev);
1816                 if (ret) {
1817                         free_netdev(ndev);
1818                         return ret;
1819                 }
1820         }
1821
1822         mutex_lock(&local->iflist_mtx);
1823         list_add_tail_rcu(&sdata->list, &local->interfaces);
1824         mutex_unlock(&local->iflist_mtx);
1825
1826         if (new_wdev)
1827                 *new_wdev = &sdata->wdev;
1828
1829         return 0;
1830 }
1831
1832 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1833 {
1834         ASSERT_RTNL();
1835
1836         mutex_lock(&sdata->local->iflist_mtx);
1837         list_del_rcu(&sdata->list);
1838         mutex_unlock(&sdata->local->iflist_mtx);
1839
1840         synchronize_rcu();
1841
1842         if (sdata->dev) {
1843                 unregister_netdevice(sdata->dev);
1844         } else {
1845                 cfg80211_unregister_wdev(&sdata->wdev);
1846                 kfree(sdata);
1847         }
1848 }
1849
1850 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
1851 {
1852         if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
1853                 return;
1854         ieee80211_do_stop(sdata, true);
1855         ieee80211_teardown_sdata(sdata);
1856 }
1857
1858 /*
1859  * Remove all interfaces, may only be called at hardware unregistration
1860  * time because it doesn't do RCU-safe list removals.
1861  */
1862 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1863 {
1864         struct ieee80211_sub_if_data *sdata, *tmp;
1865         LIST_HEAD(unreg_list);
1866         LIST_HEAD(wdev_list);
1867
1868         ASSERT_RTNL();
1869
1870         /*
1871          * Close all AP_VLAN interfaces first, as otherwise they
1872          * might be closed while the AP interface they belong to
1873          * is closed, causing unregister_netdevice_many() to crash.
1874          */
1875         list_for_each_entry(sdata, &local->interfaces, list)
1876                 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1877                         dev_close(sdata->dev);
1878
1879         mutex_lock(&local->iflist_mtx);
1880         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1881                 list_del(&sdata->list);
1882
1883                 if (sdata->dev)
1884                         unregister_netdevice_queue(sdata->dev, &unreg_list);
1885                 else
1886                         list_add(&sdata->list, &wdev_list);
1887         }
1888         mutex_unlock(&local->iflist_mtx);
1889         unregister_netdevice_many(&unreg_list);
1890
1891         list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
1892                 list_del(&sdata->list);
1893                 cfg80211_unregister_wdev(&sdata->wdev);
1894                 kfree(sdata);
1895         }
1896 }
1897
1898 static int netdev_notify(struct notifier_block *nb,
1899                          unsigned long state, void *ptr)
1900 {
1901         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1902         struct ieee80211_sub_if_data *sdata;
1903
1904         if (state != NETDEV_CHANGENAME)
1905                 return NOTIFY_DONE;
1906
1907         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1908                 return NOTIFY_DONE;
1909
1910         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1911                 return NOTIFY_DONE;
1912
1913         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1914         memcpy(sdata->name, dev->name, IFNAMSIZ);
1915         ieee80211_debugfs_rename_netdev(sdata);
1916
1917         return NOTIFY_OK;
1918 }
1919
1920 static struct notifier_block mac80211_netdev_notifier = {
1921         .notifier_call = netdev_notify,
1922 };
1923
1924 int ieee80211_iface_init(void)
1925 {
1926         return register_netdevice_notifier(&mac80211_netdev_notifier);
1927 }
1928
1929 void ieee80211_iface_exit(void)
1930 {
1931         unregister_netdevice_notifier(&mac80211_netdev_notifier);
1932 }