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  * Copyright (c) 2016        Intel Deutschland GmbH
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License version 2 as
  13  * published by the Free Software Foundation.
  14  */
  15 #include <linux/slab.h>
  16 #include <linux/kernel.h>
  17 #include <linux/if_arp.h>
  18 #include <linux/netdevice.h>
  19 #include <linux/rtnetlink.h>
  20 #include <net/mac80211.h>
  21 #include <net/ieee80211_radiotap.h>
  22 #include "ieee80211_i.h"
  23 #include "sta_info.h"
  24 #include "debugfs_netdev.h"
  25 #include "mesh.h"
  26 #include "led.h"
  27 #include "driver-ops.h"
  28 #include "wme.h"
  29 #include "rate.h"
  30
  31 /**
  32  * DOC: Interface list locking
  33  *
  34  * The interface list in each struct ieee80211_local is protected
  35  * three-fold:
  36  *
  37  * (1) modifications may only be done under the RTNL
  38  * (2) modifications and readers are protected against each other by
  39  *     the iflist_mtx.
  40  * (3) modifications are done in an RCU manner so atomic readers
  41  *     can traverse the list in RCU-safe blocks.
  42  *
  43  * As a consequence, reads (traversals) of the list can be protected
  44  * by either the RTNL, the iflist_mtx or RCU.
  45  */
  46
  47 static void ieee80211_iface_work(struct work_struct *work);
  48
  49 bool __ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
  50 {
  51         struct ieee80211_chanctx_conf *chanctx_conf;
  52         int power;
  53
  54         rcu_read_lock();
  55         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
  56         if (!chanctx_conf) {
  57                 rcu_read_unlock();
  58                 return false;
  59         }
  60
  61         power = ieee80211_chandef_max_power(&chanctx_conf->def);
  62         rcu_read_unlock();
  63
  64         if (sdata->user_power_level != IEEE80211_UNSET_POWER_LEVEL)
  65                 power = min(power, sdata->user_power_level);
  66
  67         if (sdata->ap_power_level != IEEE80211_UNSET_POWER_LEVEL)
  68                 power = min(power, sdata->ap_power_level);
  69
  70         if (power != sdata->vif.bss_conf.txpower) {
  71                 sdata->vif.bss_conf.txpower = power;
  72                 ieee80211_hw_config(sdata->local, 0);
  73                 return true;
  74         }
  75
  76         return false;
  77 }
  78
  79 void ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata,
  80                               bool update_bss)
  81 {
  82         if (__ieee80211_recalc_txpower(sdata) ||
  83             (update_bss && ieee80211_sdata_running(sdata)))
  84                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_TXPOWER);
  85 }
  86
  87 static u32 __ieee80211_idle_off(struct ieee80211_local *local)
  88 {
  89         if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
  90                 return 0;
  91
  92         local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
  93         return IEEE80211_CONF_CHANGE_IDLE;
  94 }
  95
  96 static u32 __ieee80211_idle_on(struct ieee80211_local *local)
  97 {
  98         if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
  99                 return 0;
 100
 101         ieee80211_flush_queues(local, NULL, false);
 102
 103         local->hw.conf.flags |= IEEE80211_CONF_IDLE;
 104         return IEEE80211_CONF_CHANGE_IDLE;
 105 }
 106
 107 static u32 __ieee80211_recalc_idle(struct ieee80211_local *local,
 108                                    bool force_active)
 109 {
 110         bool working, scanning, active;
 111         unsigned int led_trig_start = 0, led_trig_stop = 0;
 112
 113         lockdep_assert_held(&local->mtx);
 114
 115         active = force_active ||
 116                  !list_empty(&local->chanctx_list) ||
 117                  local->monitors;
 118
 119         working = !local->ops->remain_on_channel &&
 120                   !list_empty(&local->roc_list);
 121
 122         scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) ||
 123                    test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning);
 124
 125         if (working || scanning)
 126                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
 127         else
 128                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
 129
 130         if (active)
 131                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
 132         else
 133                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
 134
 135         ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
 136
 137         if (working || scanning || active)
 138                 return __ieee80211_idle_off(local);
 139         return __ieee80211_idle_on(local);
 140 }
 141
 142 u32 ieee80211_idle_off(struct ieee80211_local *local)
 143 {
 144         return __ieee80211_recalc_idle(local, true);
 145 }
 146
 147 void ieee80211_recalc_idle(struct ieee80211_local *local)
 148 {
 149         u32 change = __ieee80211_recalc_idle(local, false);
 150         if (change)
 151                 ieee80211_hw_config(local, change);
 152 }
 153
 154 static int ieee80211_verify_mac(struct ieee80211_sub_if_data *sdata, u8 *addr,
 155                                 bool check_dup)
 156 {
 157         struct ieee80211_local *local = sdata->local;
 158         struct ieee80211_sub_if_data *iter;
 159         u64 new, mask, tmp;
 160         u8 *m;
 161         int ret = 0;
 162
 163         if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
 164                 return 0;
 165
 166         m = addr;
 167         new =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 168                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 169                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 170
 171         m = local->hw.wiphy->addr_mask;
 172         mask =  ((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         if (!check_dup)
 177                 return ret;
 178
 179         mutex_lock(&local->iflist_mtx);
 180         list_for_each_entry(iter, &local->interfaces, list) {
 181                 if (iter == sdata)
 182                         continue;
 183
 184                 if (iter->vif.type == NL80211_IFTYPE_MONITOR &&
 185                     !(iter->u.mntr.flags & MONITOR_FLAG_ACTIVE))
 186                         continue;
 187
 188                 m = iter->vif.addr;
 189                 tmp =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 190                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 191                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 192
 193                 if ((new & ~mask) != (tmp & ~mask)) {
 194                         ret = -EINVAL;
 195                         break;
 196                 }
 197         }
 198         mutex_unlock(&local->iflist_mtx);
 199
 200         return ret;
 201 }
 202
 203 static int ieee80211_change_mac(struct net_device *dev, void *addr)
 204 {
 205         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 206         struct sockaddr *sa = addr;
 207         bool check_dup = true;
 208         int ret;
 209
 210         if (ieee80211_sdata_running(sdata))
 211                 return -EBUSY;
 212
 213         if (sdata->vif.type == NL80211_IFTYPE_MONITOR &&
 214             !(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
 215                 check_dup = false;
 216
 217         ret = ieee80211_verify_mac(sdata, sa->sa_data, check_dup);
 218         if (ret)
 219                 return ret;
 220
 221         ret = eth_mac_addr(dev, sa);
 222
 223         if (ret == 0)
 224                 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
 225
 226         return ret;
 227 }
 228
 229 static inline int identical_mac_addr_allowed(int type1, int type2)
 230 {
 231         return type1 == NL80211_IFTYPE_MONITOR ||
 232                 type2 == NL80211_IFTYPE_MONITOR ||
 233                 type1 == NL80211_IFTYPE_P2P_DEVICE ||
 234                 type2 == NL80211_IFTYPE_P2P_DEVICE ||
 235                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
 236                 (type1 == NL80211_IFTYPE_WDS &&
 237                         (type2 == NL80211_IFTYPE_WDS ||
 238                          type2 == NL80211_IFTYPE_AP)) ||
 239                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
 240                 (type1 == NL80211_IFTYPE_AP_VLAN &&
 241                         (type2 == NL80211_IFTYPE_AP ||
 242                          type2 == NL80211_IFTYPE_AP_VLAN));
 243 }
 244
 245 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
 246                                             enum nl80211_iftype iftype)
 247 {
 248         struct ieee80211_local *local = sdata->local;
 249         struct ieee80211_sub_if_data *nsdata;
 250         int ret;
 251
 252         ASSERT_RTNL();
 253
 254         /* we hold the RTNL here so can safely walk the list */
 255         list_for_each_entry(nsdata, &local->interfaces, list) {
 256                 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
 257                         /*
 258                          * Only OCB and monitor mode may coexist
 259                          */
 260                         if ((sdata->vif.type == NL80211_IFTYPE_OCB &&
 261                              nsdata->vif.type != NL80211_IFTYPE_MONITOR) ||
 262                             (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
 263                              nsdata->vif.type == NL80211_IFTYPE_OCB))
 264                                 return -EBUSY;
 265
 266                         /*
 267                          * Allow only a single IBSS interface to be up at any
 268                          * time. This is restricted because beacon distribution
 269                          * cannot work properly if both are in the same IBSS.
 270                          *
 271                          * To remove this restriction we'd have to disallow them
 272                          * from setting the same SSID on different IBSS interfaces
 273                          * belonging to the same hardware. Then, however, we're
 274                          * faced with having to adopt two different TSF timers...
 275                          */
 276                         if (iftype == NL80211_IFTYPE_ADHOC &&
 277                             nsdata->vif.type == NL80211_IFTYPE_ADHOC)
 278                                 return -EBUSY;
 279                         /*
 280                          * will not add another interface while any channel
 281                          * switch is active.
 282                          */
 283                         if (nsdata->vif.csa_active)
 284                                 return -EBUSY;
 285
 286                         /*
 287                          * The remaining checks are only performed for interfaces
 288                          * with the same MAC address.
 289                          */
 290                         if (!ether_addr_equal(sdata->vif.addr,
 291                                               nsdata->vif.addr))
 292                                 continue;
 293
 294                         /*
 295                          * check whether it may have the same address
 296                          */
 297                         if (!identical_mac_addr_allowed(iftype,
 298                                                         nsdata->vif.type))
 299                                 return -ENOTUNIQ;
 300
 301                         /*
 302                          * can only add VLANs to enabled APs
 303                          */
 304                         if (iftype == NL80211_IFTYPE_AP_VLAN &&
 305                             nsdata->vif.type == NL80211_IFTYPE_AP)
 306                                 sdata->bss = &nsdata->u.ap;
 307                 }
 308         }
 309
 310         mutex_lock(&local->chanctx_mtx);
 311         ret = ieee80211_check_combinations(sdata, NULL, 0, 0);
 312         mutex_unlock(&local->chanctx_mtx);
 313         return ret;
 314 }
 315
 316 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata,
 317                                   enum nl80211_iftype iftype)
 318 {
 319         int n_queues = sdata->local->hw.queues;
 320         int i;
 321
 322         if (iftype == NL80211_IFTYPE_NAN)
 323                 return 0;
 324
 325         if (iftype != NL80211_IFTYPE_P2P_DEVICE) {
 326                 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 327                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
 328                                          IEEE80211_INVAL_HW_QUEUE))
 329                                 return -EINVAL;
 330                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
 331                                          n_queues))
 332                                 return -EINVAL;
 333                 }
 334         }
 335
 336         if ((iftype != NL80211_IFTYPE_AP &&
 337              iftype != NL80211_IFTYPE_P2P_GO &&
 338              iftype != NL80211_IFTYPE_MESH_POINT) ||
 339             !ieee80211_hw_check(&sdata->local->hw, QUEUE_CONTROL)) {
 340                 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
 341                 return 0;
 342         }
 343
 344         if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
 345                 return -EINVAL;
 346
 347         if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
 348                 return -EINVAL;
 349
 350         return 0;
 351 }
 352
 353 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
 354                                     const int offset)
 355 {
 356         struct ieee80211_local *local = sdata->local;
 357         u32 flags = sdata->u.mntr.flags;
 358
 359 #define ADJUST(_f, _s)  do {                                    \
 360         if (flags & MONITOR_FLAG_##_f)                          \
 361                 local->fif_##_s += offset;                      \
 362         } while (0)
 363
 364         ADJUST(FCSFAIL, fcsfail);
 365         ADJUST(PLCPFAIL, plcpfail);
 366         ADJUST(CONTROL, control);
 367         ADJUST(CONTROL, pspoll);
 368         ADJUST(OTHER_BSS, other_bss);
 369
 370 #undef ADJUST
 371 }
 372
 373 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
 374 {
 375         struct ieee80211_local *local = sdata->local;
 376         int i;
 377
 378         for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 379                 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
 380                         sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
 381                 else if (local->hw.queues >= IEEE80211_NUM_ACS)
 382                         sdata->vif.hw_queue[i] = i;
 383                 else
 384                         sdata->vif.hw_queue[i] = 0;
 385         }
 386         sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
 387 }
 388
 389 int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
 390 {
 391         struct ieee80211_sub_if_data *sdata;
 392         int ret;
 393
 394         if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
 395                 return 0;
 396
 397         ASSERT_RTNL();
 398
 399         if (local->monitor_sdata)
 400                 return 0;
 401
 402         sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
 403         if (!sdata)
 404                 return -ENOMEM;
 405
 406         /* set up data */
 407         sdata->local = local;
 408         sdata->vif.type = NL80211_IFTYPE_MONITOR;
 409         snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
 410                  wiphy_name(local->hw.wiphy));
 411         sdata->wdev.iftype = NL80211_IFTYPE_MONITOR;
 412
 413         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
 414
 415         ieee80211_set_default_queues(sdata);
 416
 417         ret = drv_add_interface(local, sdata);
 418         if (WARN_ON(ret)) {
 419                 /* ok .. stupid driver, it asked for this! */
 420                 kfree(sdata);
 421                 return ret;
 422         }
 423
 424         ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR);
 425         if (ret) {
 426                 kfree(sdata);
 427                 return ret;
 428         }
 429
 430         mutex_lock(&local->iflist_mtx);
 431         rcu_assign_pointer(local->monitor_sdata, sdata);
 432         mutex_unlock(&local->iflist_mtx);
 433
 434         mutex_lock(&local->mtx);
 435         ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef,
 436                                         IEEE80211_CHANCTX_EXCLUSIVE);
 437         mutex_unlock(&local->mtx);
 438         if (ret) {
 439                 mutex_lock(&local->iflist_mtx);
 440                 RCU_INIT_POINTER(local->monitor_sdata, NULL);
 441                 mutex_unlock(&local->iflist_mtx);
 442                 synchronize_net();
 443                 drv_remove_interface(local, sdata);
 444                 kfree(sdata);
 445                 return ret;
 446         }
 447
 448         skb_queue_head_init(&sdata->skb_queue);
 449         INIT_WORK(&sdata->work, ieee80211_iface_work);
 450
 451         return 0;
 452 }
 453
 454 void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
 455 {
 456         struct ieee80211_sub_if_data *sdata;
 457
 458         if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
 459                 return;
 460
 461         ASSERT_RTNL();
 462
 463         mutex_lock(&local->iflist_mtx);
 464
 465         sdata = rcu_dereference_protected(local->monitor_sdata,
 466                                           lockdep_is_held(&local->iflist_mtx));
 467         if (!sdata) {
 468                 mutex_unlock(&local->iflist_mtx);
 469                 return;
 470         }
 471
 472         RCU_INIT_POINTER(local->monitor_sdata, NULL);
 473         mutex_unlock(&local->iflist_mtx);
 474
 475         synchronize_net();
 476
 477         mutex_lock(&local->mtx);
 478         ieee80211_vif_release_channel(sdata);
 479         mutex_unlock(&local->mtx);
 480
 481         drv_remove_interface(local, sdata);
 482
 483         kfree(sdata);
 484 }
 485
 486 /*
 487  * NOTE: Be very careful when changing this function, it must NOT return
 488  * an error on interface type changes that have been pre-checked, so most
 489  * checks should be in ieee80211_check_concurrent_iface.
 490  */
 491 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
 492 {
 493         struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
 494         struct net_device *dev = wdev->netdev;
 495         struct ieee80211_local *local = sdata->local;
 496         struct sta_info *sta;
 497         u32 changed = 0;
 498         int res;
 499         u32 hw_reconf_flags = 0;
 500
 501         switch (sdata->vif.type) {
 502         case NL80211_IFTYPE_WDS:
 503                 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
 504                         return -ENOLINK;
 505                 break;
 506         case NL80211_IFTYPE_AP_VLAN: {
 507                 struct ieee80211_sub_if_data *master;
 508
 509                 if (!sdata->bss)
 510                         return -ENOLINK;
 511
 512                 mutex_lock(&local->mtx);
 513                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
 514                 mutex_unlock(&local->mtx);
 515
 516                 master = container_of(sdata->bss,
 517                                       struct ieee80211_sub_if_data, u.ap);
 518                 sdata->control_port_protocol =
 519                         master->control_port_protocol;
 520                 sdata->control_port_no_encrypt =
 521                         master->control_port_no_encrypt;
 522                 sdata->vif.cab_queue = master->vif.cab_queue;
 523                 memcpy(sdata->vif.hw_queue, master->vif.hw_queue,
 524                        sizeof(sdata->vif.hw_queue));
 525                 sdata->vif.bss_conf.chandef = master->vif.bss_conf.chandef;
 526
 527                 mutex_lock(&local->key_mtx);
 528                 sdata->crypto_tx_tailroom_needed_cnt +=
 529                         master->crypto_tx_tailroom_needed_cnt;
 530                 mutex_unlock(&local->key_mtx);
 531
 532                 break;
 533                 }
 534         case NL80211_IFTYPE_AP:
 535                 sdata->bss = &sdata->u.ap;
 536                 break;
 537         case NL80211_IFTYPE_MESH_POINT:
 538         case NL80211_IFTYPE_STATION:
 539         case NL80211_IFTYPE_MONITOR:
 540         case NL80211_IFTYPE_ADHOC:
 541         case NL80211_IFTYPE_P2P_DEVICE:
 542         case NL80211_IFTYPE_OCB:
 543         case NL80211_IFTYPE_NAN:
 544                 /* no special treatment */
 545                 break;
 546         case NL80211_IFTYPE_UNSPECIFIED:
 547         case NUM_NL80211_IFTYPES:
 548         case NL80211_IFTYPE_P2P_CLIENT:
 549         case NL80211_IFTYPE_P2P_GO:
 550                 /* cannot happen */
 551                 WARN_ON(1);
 552                 break;
 553         }
 554
 555         if (local->open_count == 0) {
 556                 res = drv_start(local);
 557                 if (res)
 558                         goto err_del_bss;
 559                 /* we're brought up, everything changes */
 560                 hw_reconf_flags = ~0;
 561                 ieee80211_led_radio(local, true);
 562                 ieee80211_mod_tpt_led_trig(local,
 563                                            IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
 564         }
 565
 566         /*
 567          * Copy the hopefully now-present MAC address to
 568          * this interface, if it has the special null one.
 569          */
 570         if (dev && is_zero_ether_addr(dev->dev_addr)) {
 571                 memcpy(dev->dev_addr,
 572                        local->hw.wiphy->perm_addr,
 573                        ETH_ALEN);
 574                 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
 575
 576                 if (!is_valid_ether_addr(dev->dev_addr)) {
 577                         res = -EADDRNOTAVAIL;
 578                         goto err_stop;
 579                 }
 580         }
 581
 582         switch (sdata->vif.type) {
 583         case NL80211_IFTYPE_AP_VLAN:
 584                 /* no need to tell driver, but set carrier and chanctx */
 585                 if (rtnl_dereference(sdata->bss->beacon)) {
 586                         ieee80211_vif_vlan_copy_chanctx(sdata);
 587                         netif_carrier_on(dev);
 588                 } else {
 589                         netif_carrier_off(dev);
 590                 }
 591                 break;
 592         case NL80211_IFTYPE_MONITOR:
 593                 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
 594                         local->cooked_mntrs++;
 595                         break;
 596                 }
 597
 598                 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) {
 599                         res = drv_add_interface(local, sdata);
 600                         if (res)
 601                                 goto err_stop;
 602                 } else if (local->monitors == 0 && local->open_count == 0) {
 603                         res = ieee80211_add_virtual_monitor(local);
 604                         if (res)
 605                                 goto err_stop;
 606                 }
 607
 608                 /* must be before the call to ieee80211_configure_filter */
 609                 local->monitors++;
 610                 if (local->monitors == 1) {
 611                         local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
 612                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 613                 }
 614
 615                 ieee80211_adjust_monitor_flags(sdata, 1);
 616                 ieee80211_configure_filter(local);
 617                 mutex_lock(&local->mtx);
 618                 ieee80211_recalc_idle(local);
 619                 mutex_unlock(&local->mtx);
 620
 621                 netif_carrier_on(dev);
 622                 break;
 623         default:
 624                 if (coming_up) {
 625                         ieee80211_del_virtual_monitor(local);
 626
 627                         res = drv_add_interface(local, sdata);
 628                         if (res)
 629                                 goto err_stop;
 630                         res = ieee80211_check_queues(sdata,
 631                                 ieee80211_vif_type_p2p(&sdata->vif));
 632                         if (res)
 633                                 goto err_del_interface;
 634                 }
 635
 636                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
 637                         local->fif_pspoll++;
 638                         local->fif_probe_req++;
 639
 640                         ieee80211_configure_filter(local);
 641                 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 642                         local->fif_probe_req++;
 643                 }
 644
 645                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE &&
 646                     sdata->vif.type != NL80211_IFTYPE_NAN)
 647                         changed |= ieee80211_reset_erp_info(sdata);
 648                 ieee80211_bss_info_change_notify(sdata, changed);
 649
 650                 switch (sdata->vif.type) {
 651                 case NL80211_IFTYPE_STATION:
 652                 case NL80211_IFTYPE_ADHOC:
 653                 case NL80211_IFTYPE_AP:
 654                 case NL80211_IFTYPE_MESH_POINT:
 655                 case NL80211_IFTYPE_OCB:
 656                         netif_carrier_off(dev);
 657                         break;
 658                 case NL80211_IFTYPE_WDS:
 659                 case NL80211_IFTYPE_P2P_DEVICE:
 660                 case NL80211_IFTYPE_NAN:
 661                         break;
 662                 default:
 663                         /* not reached */
 664                         WARN_ON(1);
 665                 }
 666
 667                 /*
 668                  * Set default queue parameters so drivers don't
 669                  * need to initialise the hardware if the hardware
 670                  * doesn't start up with sane defaults.
 671                  * Enable QoS for anything but station interfaces.
 672                  */
 673                 ieee80211_set_wmm_default(sdata, true,
 674                         sdata->vif.type != NL80211_IFTYPE_STATION);
 675         }
 676
 677         set_bit(SDATA_STATE_RUNNING, &sdata->state);
 678
 679         switch (sdata->vif.type) {
 680         case NL80211_IFTYPE_WDS:
 681                 /* Create STA entry for the WDS peer */
 682                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
 683                                      GFP_KERNEL);
 684                 if (!sta) {
 685                         res = -ENOMEM;
 686                         goto err_del_interface;
 687                 }
 688
 689                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
 690                 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
 691                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
 692
 693                 res = sta_info_insert(sta);
 694                 if (res) {
 695                         /* STA has been freed */
 696                         goto err_del_interface;
 697                 }
 698
 699                 rate_control_rate_init(sta);
 700                 netif_carrier_on(dev);
 701                 break;
 702         case NL80211_IFTYPE_P2P_DEVICE:
 703                 rcu_assign_pointer(local->p2p_sdata, sdata);
 704                 break;
 705         case NL80211_IFTYPE_MONITOR:
 706                 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES)
 707                         break;
 708                 list_add_tail_rcu(&sdata->u.mntr.list, &local->mon_list);
 709                 break;
 710         default:
 711                 break;
 712         }
 713
 714         /*
 715          * set_multicast_list will be invoked by the networking core
 716          * which will check whether any increments here were done in
 717          * error and sync them down to the hardware as filter flags.
 718          */
 719         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 720                 atomic_inc(&local->iff_allmultis);
 721
 722         if (coming_up)
 723                 local->open_count++;
 724
 725         if (hw_reconf_flags)
 726                 ieee80211_hw_config(local, hw_reconf_flags);
 727
 728         ieee80211_recalc_ps(local);
 729
 730         if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
 731             sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
 732             local->ops->wake_tx_queue) {
 733                 /* XXX: for AP_VLAN, actually track AP queues */
 734                 if (dev)
 735                         netif_tx_start_all_queues(dev);
 736         } else if (dev) {
 737                 unsigned long flags;
 738                 int n_acs = IEEE80211_NUM_ACS;
 739                 int ac;
 740
 741                 if (local->hw.queues < IEEE80211_NUM_ACS)
 742                         n_acs = 1;
 743
 744                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 745                 if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE ||
 746                     (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 &&
 747                      skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) {
 748                         for (ac = 0; ac < n_acs; ac++) {
 749                                 int ac_queue = sdata->vif.hw_queue[ac];
 750
 751                                 if (local->queue_stop_reasons[ac_queue] == 0 &&
 752                                     skb_queue_empty(&local->pending[ac_queue]))
 753                                         netif_start_subqueue(dev, ac);
 754                         }
 755                 }
 756                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 757         }
 758
 759         return 0;
 760  err_del_interface:
 761         drv_remove_interface(local, sdata);
 762  err_stop:
 763         if (!local->open_count)
 764                 drv_stop(local);
 765  err_del_bss:
 766         sdata->bss = NULL;
 767         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 768                 mutex_lock(&local->mtx);
 769                 list_del(&sdata->u.vlan.list);
 770                 mutex_unlock(&local->mtx);
 771         }
 772         /* might already be clear but that doesn't matter */
 773         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 774         return res;
 775 }
 776
 777 static int ieee80211_open(struct net_device *dev)
 778 {
 779         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 780         int err;
 781
 782         /* fail early if user set an invalid address */
 783         if (!is_valid_ether_addr(dev->dev_addr))
 784                 return -EADDRNOTAVAIL;
 785
 786         err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
 787         if (err)
 788                 return err;
 789
 790         return ieee80211_do_open(&sdata->wdev, true);
 791 }
 792
 793 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
 794                               bool going_down)
 795 {
 796         struct ieee80211_sub_if_data *txq_sdata = sdata;
 797         struct ieee80211_local *local = sdata->local;
 798         struct fq *fq = &local->fq;
 799         unsigned long flags;
 800         struct sk_buff *skb, *tmp;
 801         u32 hw_reconf_flags = 0;
 802         int i, flushed;
 803         struct ps_data *ps;
 804         struct cfg80211_chan_def chandef;
 805         bool cancel_scan;
 806         struct cfg80211_nan_func *func;
 807
 808         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 809
 810         cancel_scan = rcu_access_pointer(local->scan_sdata) == sdata;
 811         if (cancel_scan)
 812                 ieee80211_scan_cancel(local);
 813
 814         /*
 815          * Stop TX on this interface first.
 816          */
 817         if (sdata->dev)
 818                 netif_tx_stop_all_queues(sdata->dev);
 819
 820         ieee80211_roc_purge(local, sdata);
 821
 822         switch (sdata->vif.type) {
 823         case NL80211_IFTYPE_STATION:
 824                 ieee80211_mgd_stop(sdata);
 825                 break;
 826         case NL80211_IFTYPE_ADHOC:
 827                 ieee80211_ibss_stop(sdata);
 828                 break;
 829         case NL80211_IFTYPE_AP:
 830                 cancel_work_sync(&sdata->u.ap.request_smps_work);
 831                 break;
 832         case NL80211_IFTYPE_MONITOR:
 833                 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES)
 834                         break;
 835                 list_del_rcu(&sdata->u.mntr.list);
 836                 break;
 837         default:
 838                 break;
 839         }
 840
 841         /*
 842          * Remove all stations associated with this interface.
 843          *
 844          * This must be done before calling ops->remove_interface()
 845          * because otherwise we can later invoke ops->sta_notify()
 846          * whenever the STAs are removed, and that invalidates driver
 847          * assumptions about always getting a vif pointer that is valid
 848          * (because if we remove a STA after ops->remove_interface()
 849          * the driver will have removed the vif info already!)
 850          *
 851          * In WDS mode a station must exist here and be flushed, for
 852          * AP_VLANs stations may exist since there's nothing else that
 853          * would have removed them, but in other modes there shouldn't
 854          * be any stations.
 855          */
 856         flushed = sta_info_flush(sdata);
 857         WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
 858                      ((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) ||
 859                       (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1)));
 860
 861         /* don't count this interface for allmulti while it is down */
 862         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 863                 atomic_dec(&local->iff_allmultis);
 864
 865         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 866                 local->fif_pspoll--;
 867                 local->fif_probe_req--;
 868         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 869                 local->fif_probe_req--;
 870         }
 871
 872         if (sdata->dev) {
 873                 netif_addr_lock_bh(sdata->dev);
 874                 spin_lock_bh(&local->filter_lock);
 875                 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
 876                                  sdata->dev->addr_len);
 877                 spin_unlock_bh(&local->filter_lock);
 878                 netif_addr_unlock_bh(sdata->dev);
 879         }
 880
 881         del_timer_sync(&local->dynamic_ps_timer);
 882         cancel_work_sync(&local->dynamic_ps_enable_work);
 883
 884         cancel_work_sync(&sdata->recalc_smps);
 885         sdata_lock(sdata);
 886         mutex_lock(&local->mtx);
 887         sdata->vif.csa_active = false;
 888         if (sdata->vif.type == NL80211_IFTYPE_STATION)
 889                 sdata->u.mgd.csa_waiting_bcn = false;
 890         if (sdata->csa_block_tx) {
 891                 ieee80211_wake_vif_queues(local, sdata,
 892                                           IEEE80211_QUEUE_STOP_REASON_CSA);
 893                 sdata->csa_block_tx = false;
 894         }
 895         mutex_unlock(&local->mtx);
 896         sdata_unlock(sdata);
 897
 898         cancel_work_sync(&sdata->csa_finalize_work);
 899
 900         cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
 901
 902         if (sdata->wdev.cac_started) {
 903                 chandef = sdata->vif.bss_conf.chandef;
 904                 WARN_ON(local->suspended);
 905                 mutex_lock(&local->mtx);
 906                 ieee80211_vif_release_channel(sdata);
 907                 mutex_unlock(&local->mtx);
 908                 cfg80211_cac_event(sdata->dev, &chandef,
 909                                    NL80211_RADAR_CAC_ABORTED,
 910                                    GFP_KERNEL);
 911         }
 912
 913         /* APs need special treatment */
 914         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 915                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
 916
 917                 /* down all dependent devices, that is VLANs */
 918                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
 919                                          u.vlan.list)
 920                         dev_close(vlan->dev);
 921                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
 922         } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 923                 /* remove all packets in parent bc_buf pointing to this dev */
 924                 ps = &sdata->bss->ps;
 925
 926                 spin_lock_irqsave(&ps->bc_buf.lock, flags);
 927                 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
 928                         if (skb->dev == sdata->dev) {
 929                                 __skb_unlink(skb, &ps->bc_buf);
 930                                 local->total_ps_buffered--;
 931                                 ieee80211_free_txskb(&local->hw, skb);
 932                         }
 933                 }
 934                 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
 935         }
 936
 937         if (going_down)
 938                 local->open_count--;
 939
 940         switch (sdata->vif.type) {
 941         case NL80211_IFTYPE_AP_VLAN:
 942                 txq_sdata = container_of(sdata->bss,
 943                                          struct ieee80211_sub_if_data, u.ap);
 944
 945                 mutex_lock(&local->mtx);
 946                 list_del(&sdata->u.vlan.list);
 947                 mutex_unlock(&local->mtx);
 948                 RCU_INIT_POINTER(sdata->vif.chanctx_conf, NULL);
 949                 /* see comment in the default case below */
 950                 ieee80211_free_keys(sdata, true);
 951                 /* no need to tell driver */
 952                 break;
 953         case NL80211_IFTYPE_MONITOR:
 954                 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
 955                         local->cooked_mntrs--;
 956                         break;
 957                 }
 958
 959                 local->monitors--;
 960                 if (local->monitors == 0) {
 961                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
 962                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 963                 }
 964
 965                 ieee80211_adjust_monitor_flags(sdata, -1);
 966                 break;
 967         case NL80211_IFTYPE_NAN:
 968                 /* clean all the functions */
 969                 spin_lock_bh(&sdata->u.nan.func_lock);
 970
 971                 idr_for_each_entry(&sdata->u.nan.function_inst_ids, func, i) {
 972                         idr_remove(&sdata->u.nan.function_inst_ids, i);
 973                         cfg80211_free_nan_func(func);
 974                 }
 975                 idr_destroy(&sdata->u.nan.function_inst_ids);
 976
 977                 spin_unlock_bh(&sdata->u.nan.func_lock);
 978                 break;
 979         case NL80211_IFTYPE_P2P_DEVICE:
 980                 /* relies on synchronize_rcu() below */
 981                 RCU_INIT_POINTER(local->p2p_sdata, NULL);
 982                 /* fall through */
 983         default:
 984                 cancel_work_sync(&sdata->work);
 985                 /*
 986                  * When we get here, the interface is marked down.
 987                  * Free the remaining keys, if there are any
 988                  * (which can happen in AP mode if userspace sets
 989                  * keys before the interface is operating, and maybe
 990                  * also in WDS mode)
 991                  *
 992                  * Force the key freeing to always synchronize_net()
 993                  * to wait for the RX path in case it is using this
 994                  * interface enqueuing frames at this very time on
 995                  * another CPU.
 996                  */
 997                 ieee80211_free_keys(sdata, true);
 998                 skb_queue_purge(&sdata->skb_queue);
 999         }
1000
1001         sdata->bss = NULL;
1002
1003         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1004         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
1005                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
1006                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1007                         if (info->control.vif == &sdata->vif) {
1008                                 __skb_unlink(skb, &local->pending[i]);
1009                                 ieee80211_free_txskb(&local->hw, skb);
1010                         }
1011                 }
1012         }
1013         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1014
1015         if (txq_sdata->vif.txq) {
1016                 struct txq_info *txqi = to_txq_info(txq_sdata->vif.txq);
1017
1018                 /*
1019                  * FIXME FIXME
1020                  *
1021                  * We really shouldn't purge the *entire* txqi since that
1022                  * contains frames for the other AP_VLANs (and possibly
1023                  * the AP itself) as well, but there's no API in FQ now
1024                  * to be able to filter.
1025                  */
1026
1027                 spin_lock_bh(&fq->lock);
1028                 ieee80211_txq_purge(local, txqi);
1029                 spin_unlock_bh(&fq->lock);
1030         }
1031
1032         if (local->open_count == 0)
1033                 ieee80211_clear_tx_pending(local);
1034
1035         sdata->vif.bss_conf.beacon_int = 0;
1036
1037         /*
1038          * If the interface goes down while suspended, presumably because
1039          * the device was unplugged and that happens before our resume,
1040          * then the driver is already unconfigured and the remainder of
1041          * this function isn't needed.
1042          * XXX: what about WoWLAN? If the device has software state, e.g.
1043          *      memory allocated, it might expect teardown commands from
1044          *      mac80211 here?
1045          */
1046         if (local->suspended) {
1047                 WARN_ON(local->wowlan);
1048                 WARN_ON(rtnl_dereference(local->monitor_sdata));
1049                 return;
1050         }
1051
1052         switch (sdata->vif.type) {
1053         case NL80211_IFTYPE_AP_VLAN:
1054                 break;
1055         case NL80211_IFTYPE_MONITOR:
1056                 if (local->monitors == 0)
1057                         ieee80211_del_virtual_monitor(local);
1058
1059                 mutex_lock(&local->mtx);
1060                 ieee80211_recalc_idle(local);
1061                 mutex_unlock(&local->mtx);
1062
1063                 if (!(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
1064                         break;
1065
1066                 /* fall through */
1067         default:
1068                 if (going_down)
1069                         drv_remove_interface(local, sdata);
1070         }
1071
1072         ieee80211_recalc_ps(local);
1073
1074         if (cancel_scan)
1075                 flush_delayed_work(&local->scan_work);
1076
1077         if (local->open_count == 0) {
1078                 ieee80211_stop_device(local);
1079
1080                 /* no reconfiguring after stop! */
1081                 return;
1082         }
1083
1084         /* do after stop to avoid reconfiguring when we stop anyway */
1085         ieee80211_configure_filter(local);
1086         ieee80211_hw_config(local, hw_reconf_flags);
1087
1088         if (local->monitors == local->open_count)
1089                 ieee80211_add_virtual_monitor(local);
1090 }
1091
1092 static int ieee80211_stop(struct net_device *dev)
1093 {
1094         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1095
1096         ieee80211_do_stop(sdata, true);
1097
1098         return 0;
1099 }
1100
1101 static void ieee80211_set_multicast_list(struct net_device *dev)
1102 {
1103         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1104         struct ieee80211_local *local = sdata->local;
1105         int allmulti, sdata_allmulti;
1106
1107         allmulti = !!(dev->flags & IFF_ALLMULTI);
1108         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
1109
1110         if (allmulti != sdata_allmulti) {
1111                 if (dev->flags & IFF_ALLMULTI)
1112                         atomic_inc(&local->iff_allmultis);
1113                 else
1114                         atomic_dec(&local->iff_allmultis);
1115                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
1116         }
1117
1118         spin_lock_bh(&local->filter_lock);
1119         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
1120         spin_unlock_bh(&local->filter_lock);
1121         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
1122 }
1123
1124 /*
1125  * Called when the netdev is removed or, by the code below, before
1126  * the interface type changes.
1127  */
1128 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
1129 {
1130         /* free extra data */
1131         ieee80211_free_keys(sdata, false);
1132
1133         ieee80211_debugfs_remove_netdev(sdata);
1134
1135         ieee80211_destroy_frag_cache(&sdata->frags);
1136
1137         if (ieee80211_vif_is_mesh(&sdata->vif))
1138                 ieee80211_mesh_teardown_sdata(sdata);
1139 }
1140
1141 static void ieee80211_uninit(struct net_device *dev)
1142 {
1143         ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
1144 }
1145
1146 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
1147                                          struct sk_buff *skb,
1148                                          void *accel_priv,
1149                                          select_queue_fallback_t fallback)
1150 {
1151         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
1152 }
1153
1154 static void
1155 ieee80211_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
1156 {
1157         int i;
1158
1159         for_each_possible_cpu(i) {
1160                 const struct pcpu_sw_netstats *tstats;
1161                 u64 rx_packets, rx_bytes, tx_packets, tx_bytes;
1162                 unsigned int start;
1163
1164                 tstats = per_cpu_ptr(dev->tstats, i);
1165
1166                 do {
1167                         start = u64_stats_fetch_begin_irq(&tstats->syncp);
1168                         rx_packets = tstats->rx_packets;
1169                         tx_packets = tstats->tx_packets;
1170                         rx_bytes = tstats->rx_bytes;
1171                         tx_bytes = tstats->tx_bytes;
1172                 } while (u64_stats_fetch_retry_irq(&tstats->syncp, start));
1173
1174                 stats->rx_packets += rx_packets;
1175                 stats->tx_packets += tx_packets;
1176                 stats->rx_bytes   += rx_bytes;
1177                 stats->tx_bytes   += tx_bytes;
1178         }
1179 }
1180
1181 static const struct net_device_ops ieee80211_dataif_ops = {
1182         .ndo_open               = ieee80211_open,
1183         .ndo_stop               = ieee80211_stop,
1184         .ndo_uninit             = ieee80211_uninit,
1185         .ndo_start_xmit         = ieee80211_subif_start_xmit,
1186         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1187         .ndo_set_mac_address    = ieee80211_change_mac,
1188         .ndo_select_queue       = ieee80211_netdev_select_queue,
1189         .ndo_get_stats64        = ieee80211_get_stats64,
1190 };
1191
1192 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
1193                                           struct sk_buff *skb,
1194                                           void *accel_priv,
1195                                           select_queue_fallback_t fallback)
1196 {
1197         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1198         struct ieee80211_local *local = sdata->local;
1199         struct ieee80211_hdr *hdr;
1200         struct ieee80211_radiotap_header *rtap = (void *)skb->data;
1201
1202         if (local->hw.queues < IEEE80211_NUM_ACS)
1203                 return 0;
1204
1205         if (skb->len < 4 ||
1206             skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
1207                 return 0; /* doesn't matter, frame will be dropped */
1208
1209         hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
1210
1211         return ieee80211_select_queue_80211(sdata, skb, hdr);
1212 }
1213
1214 static const struct net_device_ops ieee80211_monitorif_ops = {
1215         .ndo_open               = ieee80211_open,
1216         .ndo_stop               = ieee80211_stop,
1217         .ndo_uninit             = ieee80211_uninit,
1218         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
1219         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1220         .ndo_set_mac_address    = ieee80211_change_mac,
1221         .ndo_select_queue       = ieee80211_monitor_select_queue,
1222         .ndo_get_stats64        = ieee80211_get_stats64,
1223 };
1224
1225 static void ieee80211_if_free(struct net_device *dev)
1226 {
1227         free_percpu(dev->tstats);
1228 }
1229
1230 static void ieee80211_if_setup(struct net_device *dev)
1231 {
1232         ether_setup(dev);
1233         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1234         dev->netdev_ops = &ieee80211_dataif_ops;
1235         dev->needs_free_netdev = true;
1236         dev->priv_destructor = ieee80211_if_free;
1237 }
1238
1239 static void ieee80211_if_setup_no_queue(struct net_device *dev)
1240 {
1241         ieee80211_if_setup(dev);
1242         dev->priv_flags |= IFF_NO_QUEUE;
1243 }
1244
1245 static void ieee80211_iface_work(struct work_struct *work)
1246 {
1247         struct ieee80211_sub_if_data *sdata =
1248                 container_of(work, struct ieee80211_sub_if_data, work);
1249         struct ieee80211_local *local = sdata->local;
1250         struct sk_buff *skb;
1251         struct sta_info *sta;
1252
1253         if (!ieee80211_sdata_running(sdata))
1254                 return;
1255
1256         if (test_bit(SCAN_SW_SCANNING, &local->scanning))
1257                 return;
1258
1259         if (!ieee80211_can_run_worker(local))
1260                 return;
1261
1262         /* first process frames */
1263         while ((skb = skb_dequeue(&sdata->skb_queue))) {
1264                 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1265
1266                 if (ieee80211_is_action(mgmt->frame_control) &&
1267                     mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1268                         int len = skb->len;
1269
1270                         mutex_lock(&local->sta_mtx);
1271                         sta = sta_info_get_bss(sdata, mgmt->sa);
1272                         if (sta) {
1273                                 switch (mgmt->u.action.u.addba_req.action_code) {
1274                                 case WLAN_ACTION_ADDBA_REQ:
1275                                         ieee80211_process_addba_request(
1276                                                         local, sta, mgmt, len);
1277                                         break;
1278                                 case WLAN_ACTION_ADDBA_RESP:
1279                                         ieee80211_process_addba_resp(local, sta,
1280                                                                      mgmt, len);
1281                                         break;
1282                                 case WLAN_ACTION_DELBA:
1283                                         ieee80211_process_delba(sdata, sta,
1284                                                                 mgmt, len);
1285                                         break;
1286                                 default:
1287                                         WARN_ON(1);
1288                                         break;
1289                                 }
1290                         }
1291                         mutex_unlock(&local->sta_mtx);
1292                 } else if (ieee80211_is_action(mgmt->frame_control) &&
1293                            mgmt->u.action.category == WLAN_CATEGORY_VHT) {
1294                         switch (mgmt->u.action.u.vht_group_notif.action_code) {
1295                         case WLAN_VHT_ACTION_OPMODE_NOTIF: {
1296                                 struct ieee80211_rx_status *status;
1297                                 enum nl80211_band band;
1298                                 u8 opmode;
1299
1300                                 status = IEEE80211_SKB_RXCB(skb);
1301                                 band = status->band;
1302                                 opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
1303
1304                                 mutex_lock(&local->sta_mtx);
1305                                 sta = sta_info_get_bss(sdata, mgmt->sa);
1306
1307                                 if (sta)
1308                                         ieee80211_vht_handle_opmode(sdata, sta,
1309                                                                     opmode,
1310                                                                     band);
1311
1312                                 mutex_unlock(&local->sta_mtx);
1313                                 break;
1314                         }
1315                         case WLAN_VHT_ACTION_GROUPID_MGMT:
1316                                 ieee80211_process_mu_groups(sdata, mgmt);
1317                                 break;
1318                         default:
1319                                 WARN_ON(1);
1320                                 break;
1321                         }
1322                 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1323                         struct ieee80211_hdr *hdr = (void *)mgmt;
1324                         /*
1325                          * So the frame isn't mgmt, but frame_control
1326                          * is at the right place anyway, of course, so
1327                          * the if statement is correct.
1328                          *
1329                          * Warn if we have other data frame types here,
1330                          * they must not get here.
1331                          */
1332                         WARN_ON(hdr->frame_control &
1333                                         cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1334                         WARN_ON(!(hdr->seq_ctrl &
1335                                         cpu_to_le16(IEEE80211_SCTL_FRAG)));
1336                         /*
1337                          * This was a fragment of a frame, received while
1338                          * a block-ack session was active. That cannot be
1339                          * right, so terminate the session.
1340                          */
1341                         mutex_lock(&local->sta_mtx);
1342                         sta = sta_info_get_bss(sdata, mgmt->sa);
1343                         if (sta) {
1344                                 u16 tid = *ieee80211_get_qos_ctl(hdr) &
1345                                                 IEEE80211_QOS_CTL_TID_MASK;
1346
1347                                 __ieee80211_stop_rx_ba_session(
1348                                         sta, tid, WLAN_BACK_RECIPIENT,
1349                                         WLAN_REASON_QSTA_REQUIRE_SETUP,
1350                                         true);
1351                         }
1352                         mutex_unlock(&local->sta_mtx);
1353                 } else switch (sdata->vif.type) {
1354                 case NL80211_IFTYPE_STATION:
1355                         ieee80211_sta_rx_queued_mgmt(sdata, skb);
1356                         break;
1357                 case NL80211_IFTYPE_ADHOC:
1358                         ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1359                         break;
1360                 case NL80211_IFTYPE_MESH_POINT:
1361                         if (!ieee80211_vif_is_mesh(&sdata->vif))
1362                                 break;
1363                         ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1364                         break;
1365                 default:
1366                         WARN(1, "frame for unexpected interface type");
1367                         break;
1368                 }
1369
1370                 kfree_skb(skb);
1371         }
1372
1373         /* then other type-dependent work */
1374         switch (sdata->vif.type) {
1375         case NL80211_IFTYPE_STATION:
1376                 ieee80211_sta_work(sdata);
1377                 break;
1378         case NL80211_IFTYPE_ADHOC:
1379                 ieee80211_ibss_work(sdata);
1380                 break;
1381         case NL80211_IFTYPE_MESH_POINT:
1382                 if (!ieee80211_vif_is_mesh(&sdata->vif))
1383                         break;
1384                 ieee80211_mesh_work(sdata);
1385                 break;
1386         case NL80211_IFTYPE_OCB:
1387                 ieee80211_ocb_work(sdata);
1388                 break;
1389         default:
1390                 break;
1391         }
1392 }
1393
1394 static void ieee80211_recalc_smps_work(struct work_struct *work)
1395 {
1396         struct ieee80211_sub_if_data *sdata =
1397                 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1398
1399         ieee80211_recalc_smps(sdata);
1400 }
1401
1402 /*
1403  * Helper function to initialise an interface to a specific type.
1404  */
1405 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1406                                   enum nl80211_iftype type)
1407 {
1408         static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff,
1409                                                     0xff, 0xff, 0xff};
1410
1411         /* clear type-dependent union */
1412         memset(&sdata->u, 0, sizeof(sdata->u));
1413
1414         /* and set some type-dependent values */
1415         sdata->vif.type = type;
1416         sdata->vif.p2p = false;
1417         sdata->wdev.iftype = type;
1418
1419         sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1420         sdata->control_port_no_encrypt = false;
1421         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1422         sdata->vif.bss_conf.idle = true;
1423
1424         sdata->noack_map = 0;
1425
1426         /* only monitor/p2p-device differ */
1427         if (sdata->dev) {
1428                 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1429                 sdata->dev->type = ARPHRD_ETHER;
1430         }
1431
1432         skb_queue_head_init(&sdata->skb_queue);
1433         INIT_WORK(&sdata->work, ieee80211_iface_work);
1434         INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1435         INIT_WORK(&sdata->csa_finalize_work, ieee80211_csa_finalize_work);
1436         INIT_LIST_HEAD(&sdata->assigned_chanctx_list);
1437         INIT_LIST_HEAD(&sdata->reserved_chanctx_list);
1438
1439         switch (type) {
1440         case NL80211_IFTYPE_P2P_GO:
1441                 type = NL80211_IFTYPE_AP;
1442                 sdata->vif.type = type;
1443                 sdata->vif.p2p = true;
1444                 /* fall through */
1445         case NL80211_IFTYPE_AP:
1446                 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1447                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1448                 INIT_WORK(&sdata->u.ap.request_smps_work,
1449                           ieee80211_request_smps_ap_work);
1450                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1451                 sdata->u.ap.req_smps = IEEE80211_SMPS_OFF;
1452                 break;
1453         case NL80211_IFTYPE_P2P_CLIENT:
1454                 type = NL80211_IFTYPE_STATION;
1455                 sdata->vif.type = type;
1456                 sdata->vif.p2p = true;
1457                 /* fall through */
1458         case NL80211_IFTYPE_STATION:
1459                 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1460                 ieee80211_sta_setup_sdata(sdata);
1461                 break;
1462         case NL80211_IFTYPE_OCB:
1463                 sdata->vif.bss_conf.bssid = bssid_wildcard;
1464                 ieee80211_ocb_setup_sdata(sdata);
1465                 break;
1466         case NL80211_IFTYPE_ADHOC:
1467                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1468                 ieee80211_ibss_setup_sdata(sdata);
1469                 break;
1470         case NL80211_IFTYPE_MESH_POINT:
1471                 if (ieee80211_vif_is_mesh(&sdata->vif))
1472                         ieee80211_mesh_init_sdata(sdata);
1473                 break;
1474         case NL80211_IFTYPE_MONITOR:
1475                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1476                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1477                 sdata->u.mntr.flags = MONITOR_FLAG_CONTROL |
1478                                       MONITOR_FLAG_OTHER_BSS;
1479                 break;
1480         case NL80211_IFTYPE_WDS:
1481                 sdata->vif.bss_conf.bssid = NULL;
1482                 break;
1483         case NL80211_IFTYPE_NAN:
1484                 idr_init(&sdata->u.nan.function_inst_ids);
1485                 spin_lock_init(&sdata->u.nan.func_lock);
1486                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1487                 break;
1488         case NL80211_IFTYPE_AP_VLAN:
1489         case NL80211_IFTYPE_P2P_DEVICE:
1490                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1491                 break;
1492         case NL80211_IFTYPE_UNSPECIFIED:
1493         case NUM_NL80211_IFTYPES:
1494                 WARN_ON(1);
1495                 break;
1496         }
1497
1498         ieee80211_debugfs_add_netdev(sdata);
1499 }
1500
1501 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1502                                            enum nl80211_iftype type)
1503 {
1504         struct ieee80211_local *local = sdata->local;
1505         int ret, err;
1506         enum nl80211_iftype internal_type = type;
1507         bool p2p = false;
1508
1509         ASSERT_RTNL();
1510
1511         if (!local->ops->change_interface)
1512                 return -EBUSY;
1513
1514         switch (sdata->vif.type) {
1515         case NL80211_IFTYPE_AP:
1516         case NL80211_IFTYPE_STATION:
1517         case NL80211_IFTYPE_ADHOC:
1518         case NL80211_IFTYPE_OCB:
1519                 /*
1520                  * Could maybe also all others here?
1521                  * Just not sure how that interacts
1522                  * with the RX/config path e.g. for
1523                  * mesh.
1524                  */
1525                 break;
1526         default:
1527                 return -EBUSY;
1528         }
1529
1530         switch (type) {
1531         case NL80211_IFTYPE_AP:
1532         case NL80211_IFTYPE_STATION:
1533         case NL80211_IFTYPE_ADHOC:
1534         case NL80211_IFTYPE_OCB:
1535                 /*
1536                  * Could probably support everything
1537                  * but WDS here (WDS do_open can fail
1538                  * under memory pressure, which this
1539                  * code isn't prepared to handle).
1540                  */
1541                 break;
1542         case NL80211_IFTYPE_P2P_CLIENT:
1543                 p2p = true;
1544                 internal_type = NL80211_IFTYPE_STATION;
1545                 break;
1546         case NL80211_IFTYPE_P2P_GO:
1547                 p2p = true;
1548                 internal_type = NL80211_IFTYPE_AP;
1549                 break;
1550         default:
1551                 return -EBUSY;
1552         }
1553
1554         ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1555         if (ret)
1556                 return ret;
1557
1558         ieee80211_stop_vif_queues(local, sdata,
1559                                   IEEE80211_QUEUE_STOP_REASON_IFTYPE_CHANGE);
1560         synchronize_net();
1561
1562         ieee80211_do_stop(sdata, false);
1563
1564         ieee80211_teardown_sdata(sdata);
1565
1566         ret = drv_change_interface(local, sdata, internal_type, p2p);
1567         if (ret)
1568                 type = ieee80211_vif_type_p2p(&sdata->vif);
1569
1570         /*
1571          * Ignore return value here, there's not much we can do since
1572          * the driver changed the interface type internally already.
1573          * The warnings will hopefully make driver authors fix it :-)
1574          */
1575         ieee80211_check_queues(sdata, type);
1576
1577         ieee80211_setup_sdata(sdata, type);
1578
1579         err = ieee80211_do_open(&sdata->wdev, false);
1580         WARN(err, "type change: do_open returned %d", err);
1581
1582         ieee80211_wake_vif_queues(local, sdata,
1583                                   IEEE80211_QUEUE_STOP_REASON_IFTYPE_CHANGE);
1584         return ret;
1585 }
1586
1587 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1588                              enum nl80211_iftype type)
1589 {
1590         int ret;
1591
1592         ASSERT_RTNL();
1593
1594         if (type == ieee80211_vif_type_p2p(&sdata->vif))
1595                 return 0;
1596
1597         if (ieee80211_sdata_running(sdata)) {
1598                 ret = ieee80211_runtime_change_iftype(sdata, type);
1599                 if (ret)
1600                         return ret;
1601         } else {
1602                 /* Purge and reset type-dependent state. */
1603                 ieee80211_teardown_sdata(sdata);
1604                 ieee80211_setup_sdata(sdata, type);
1605         }
1606
1607         /* reset some values that shouldn't be kept across type changes */
1608         if (type == NL80211_IFTYPE_STATION)
1609                 sdata->u.mgd.use_4addr = false;
1610
1611         return 0;
1612 }
1613
1614 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1615                                        u8 *perm_addr, enum nl80211_iftype type)
1616 {
1617         struct ieee80211_sub_if_data *sdata;
1618         u64 mask, start, addr, val, inc;
1619         u8 *m;
1620         u8 tmp_addr[ETH_ALEN];
1621         int i;
1622
1623         /* default ... something at least */
1624         memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1625
1626         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1627             local->hw.wiphy->n_addresses <= 1)
1628                 return;
1629
1630         mutex_lock(&local->iflist_mtx);
1631
1632         switch (type) {
1633         case NL80211_IFTYPE_MONITOR:
1634                 /* doesn't matter */
1635                 break;
1636         case NL80211_IFTYPE_WDS:
1637         case NL80211_IFTYPE_AP_VLAN:
1638                 /* match up with an AP interface */
1639                 list_for_each_entry(sdata, &local->interfaces, list) {
1640                         if (sdata->vif.type != NL80211_IFTYPE_AP)
1641                                 continue;
1642                         memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1643                         break;
1644                 }
1645                 /* keep default if no AP interface present */
1646                 break;
1647         case NL80211_IFTYPE_P2P_CLIENT:
1648         case NL80211_IFTYPE_P2P_GO:
1649                 if (ieee80211_hw_check(&local->hw, P2P_DEV_ADDR_FOR_INTF)) {
1650                         list_for_each_entry(sdata, &local->interfaces, list) {
1651                                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1652                                         continue;
1653                                 if (!ieee80211_sdata_running(sdata))
1654                                         continue;
1655                                 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1656                                 goto out_unlock;
1657                         }
1658                 }
1659                 /* otherwise fall through */
1660         default:
1661                 /* assign a new address if possible -- try n_addresses first */
1662                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1663                         bool used = false;
1664
1665                         list_for_each_entry(sdata, &local->interfaces, list) {
1666                                 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr,
1667                                                      sdata->vif.addr)) {
1668                                         used = true;
1669                                         break;
1670                                 }
1671                         }
1672
1673                         if (!used) {
1674                                 memcpy(perm_addr,
1675                                        local->hw.wiphy->addresses[i].addr,
1676                                        ETH_ALEN);
1677                                 break;
1678                         }
1679                 }
1680
1681                 /* try mask if available */
1682                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1683                         break;
1684
1685                 m = local->hw.wiphy->addr_mask;
1686                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1687                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1688                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1689
1690                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1691                         /* not a contiguous mask ... not handled now! */
1692                         pr_info("not contiguous\n");
1693                         break;
1694                 }
1695
1696                 /*
1697                  * Pick address of existing interface in case user changed
1698                  * MAC address manually, default to perm_addr.
1699                  */
1700                 m = local->hw.wiphy->perm_addr;
1701                 list_for_each_entry(sdata, &local->interfaces, list) {
1702                         if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
1703                                 continue;
1704                         m = sdata->vif.addr;
1705                         break;
1706                 }
1707                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1708                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1709                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1710
1711                 inc = 1ULL<<__ffs64(mask);
1712                 val = (start & mask);
1713                 addr = (start & ~mask) | (val & mask);
1714                 do {
1715                         bool used = false;
1716
1717                         tmp_addr[5] = addr >> 0*8;
1718                         tmp_addr[4] = addr >> 1*8;
1719                         tmp_addr[3] = addr >> 2*8;
1720                         tmp_addr[2] = addr >> 3*8;
1721                         tmp_addr[1] = addr >> 4*8;
1722                         tmp_addr[0] = addr >> 5*8;
1723
1724                         val += inc;
1725
1726                         list_for_each_entry(sdata, &local->interfaces, list) {
1727                                 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) {
1728                                         used = true;
1729                                         break;
1730                                 }
1731                         }
1732
1733                         if (!used) {
1734                                 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1735                                 break;
1736                         }
1737                         addr = (start & ~mask) | (val & mask);
1738                 } while (addr != start);
1739
1740                 break;
1741         }
1742
1743  out_unlock:
1744         mutex_unlock(&local->iflist_mtx);
1745 }
1746
1747 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1748                      unsigned char name_assign_type,
1749                      struct wireless_dev **new_wdev, enum nl80211_iftype type,
1750                      struct vif_params *params)
1751 {
1752         struct net_device *ndev = NULL;
1753         struct ieee80211_sub_if_data *sdata = NULL;
1754         struct txq_info *txqi;
1755         void (*if_setup)(struct net_device *dev);
1756         int ret, i;
1757         int txqs = 1;
1758
1759         ASSERT_RTNL();
1760
1761         if (type == NL80211_IFTYPE_P2P_DEVICE || type == NL80211_IFTYPE_NAN) {
1762                 struct wireless_dev *wdev;
1763
1764                 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1765                                 GFP_KERNEL);
1766                 if (!sdata)
1767                         return -ENOMEM;
1768                 wdev = &sdata->wdev;
1769
1770                 sdata->dev = NULL;
1771                 strlcpy(sdata->name, name, IFNAMSIZ);
1772                 ieee80211_assign_perm_addr(local, wdev->address, type);
1773                 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1774         } else {
1775                 int size = ALIGN(sizeof(*sdata) + local->hw.vif_data_size,
1776                                  sizeof(void *));
1777                 int txq_size = 0;
1778
1779                 if (local->ops->wake_tx_queue)
1780                         txq_size += sizeof(struct txq_info) +
1781                                     local->hw.txq_data_size;
1782
1783                 if (local->ops->wake_tx_queue)
1784                         if_setup = ieee80211_if_setup_no_queue;
1785                 else
1786                         if_setup = ieee80211_if_setup;
1787
1788                 if (local->hw.queues >= IEEE80211_NUM_ACS)
1789                         txqs = IEEE80211_NUM_ACS;
1790
1791                 ndev = alloc_netdev_mqs(size + txq_size,
1792                                         name, name_assign_type,
1793                                         if_setup, txqs, 1);
1794                 if (!ndev)
1795                         return -ENOMEM;
1796                 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1797
1798                 ndev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1799                 if (!ndev->tstats) {
1800                         free_netdev(ndev);
1801                         return -ENOMEM;
1802                 }
1803
1804                 ndev->needed_headroom = local->tx_headroom +
1805                                         4*6 /* four MAC addresses */
1806                                         + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1807                                         + 6 /* mesh */
1808                                         + 8 /* rfc1042/bridge tunnel */
1809                                         - ETH_HLEN /* ethernet hard_header_len */
1810                                         + IEEE80211_ENCRYPT_HEADROOM;
1811                 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1812
1813                 ret = dev_alloc_name(ndev, ndev->name);
1814                 if (ret < 0) {
1815                         ieee80211_if_free(ndev);
1816                         free_netdev(ndev);
1817                         return ret;
1818                 }
1819
1820                 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1821                 if (params && is_valid_ether_addr(params->macaddr))
1822                         memcpy(ndev->dev_addr, params->macaddr, ETH_ALEN);
1823                 else
1824                         memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1825                 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1826
1827                 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1828                 sdata = netdev_priv(ndev);
1829                 ndev->ieee80211_ptr = &sdata->wdev;
1830                 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1831                 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1832
1833                 if (txq_size) {
1834                         txqi = netdev_priv(ndev) + size;
1835                         ieee80211_txq_init(sdata, NULL, txqi, 0);
1836                 }
1837
1838                 sdata->dev = ndev;
1839         }
1840
1841         /* initialise type-independent data */
1842         sdata->wdev.wiphy = local->hw.wiphy;
1843         sdata->local = local;
1844
1845         ieee80211_init_frag_cache(&sdata->frags);
1846
1847         INIT_LIST_HEAD(&sdata->key_list);
1848
1849         INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
1850                           ieee80211_dfs_cac_timer_work);
1851         INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
1852                           ieee80211_delayed_tailroom_dec);
1853
1854         for (i = 0; i < NUM_NL80211_BANDS; i++) {
1855                 struct ieee80211_supported_band *sband;
1856                 sband = local->hw.wiphy->bands[i];
1857                 sdata->rc_rateidx_mask[i] =
1858                         sband ? (1 << sband->n_bitrates) - 1 : 0;
1859                 if (sband) {
1860                         __le16 cap;
1861                         u16 *vht_rate_mask;
1862
1863                         memcpy(sdata->rc_rateidx_mcs_mask[i],
1864                                sband->ht_cap.mcs.rx_mask,
1865                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1866
1867                         cap = sband->vht_cap.vht_mcs.rx_mcs_map;
1868                         vht_rate_mask = sdata->rc_rateidx_vht_mcs_mask[i];
1869                         ieee80211_get_vht_mask_from_cap(cap, vht_rate_mask);
1870                 } else {
1871                         memset(sdata->rc_rateidx_mcs_mask[i], 0,
1872                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1873                         memset(sdata->rc_rateidx_vht_mcs_mask[i], 0,
1874                                sizeof(sdata->rc_rateidx_vht_mcs_mask[i]));
1875                 }
1876         }
1877
1878         ieee80211_set_default_queues(sdata);
1879
1880         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1881         sdata->user_power_level = local->user_power_level;
1882
1883         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1884
1885         /* setup type-dependent data */
1886         ieee80211_setup_sdata(sdata, type);
1887
1888         if (ndev) {
1889                 if (params) {
1890                         ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1891                         if (type == NL80211_IFTYPE_STATION)
1892                                 sdata->u.mgd.use_4addr = params->use_4addr;
1893                 }
1894
1895                 ndev->features |= local->hw.netdev_features;
1896
1897                 netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops);
1898
1899                 /* MTU range: 256 - 2304 */
1900                 ndev->min_mtu = 256;
1901                 ndev->max_mtu = IEEE80211_MAX_DATA_LEN;
1902
1903                 ret = register_netdevice(ndev);
1904                 if (ret) {
1905                         free_netdev(ndev);
1906                         return ret;
1907                 }
1908         }
1909
1910         mutex_lock(&local->iflist_mtx);
1911         list_add_tail_rcu(&sdata->list, &local->interfaces);
1912         mutex_unlock(&local->iflist_mtx);
1913
1914         if (new_wdev)
1915                 *new_wdev = &sdata->wdev;
1916
1917         return 0;
1918 }
1919
1920 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1921 {
1922         ASSERT_RTNL();
1923
1924         mutex_lock(&sdata->local->iflist_mtx);
1925         list_del_rcu(&sdata->list);
1926         mutex_unlock(&sdata->local->iflist_mtx);
1927
1928         if (sdata->vif.txq)
1929                 ieee80211_txq_purge(sdata->local, to_txq_info(sdata->vif.txq));
1930
1931         synchronize_rcu();
1932
1933         if (sdata->dev) {
1934                 unregister_netdevice(sdata->dev);
1935         } else {
1936                 cfg80211_unregister_wdev(&sdata->wdev);
1937                 ieee80211_teardown_sdata(sdata);
1938                 kfree(sdata);
1939         }
1940 }
1941
1942 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
1943 {
1944         if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
1945                 return;
1946         ieee80211_do_stop(sdata, true);
1947 }
1948
1949 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1950 {
1951         struct ieee80211_sub_if_data *sdata, *tmp;
1952         LIST_HEAD(unreg_list);
1953         LIST_HEAD(wdev_list);
1954
1955         ASSERT_RTNL();
1956
1957         /* Before destroying the interfaces, make sure they're all stopped so
1958          * that the hardware is stopped. Otherwise, the driver might still be
1959          * iterating the interfaces during the shutdown, e.g. from a worker
1960          * or from RX processing or similar, and if it does so (using atomic
1961          * iteration) while we're manipulating the list, the iteration will
1962          * crash.
1963          *
1964          * After this, the hardware should be stopped and the driver should
1965          * have stopped all of its activities, so that we can do RCU-unaware
1966          * manipulations of the interface list below.
1967          */
1968         cfg80211_shutdown_all_interfaces(local->hw.wiphy);
1969
1970         WARN(local->open_count, "%s: open count remains %d\n",
1971              wiphy_name(local->hw.wiphy), local->open_count);
1972
1973         mutex_lock(&local->iflist_mtx);
1974         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1975                 list_del(&sdata->list);
1976
1977                 if (sdata->dev)
1978                         unregister_netdevice_queue(sdata->dev, &unreg_list);
1979                 else
1980                         list_add(&sdata->list, &wdev_list);
1981         }
1982         mutex_unlock(&local->iflist_mtx);
1983         unregister_netdevice_many(&unreg_list);
1984
1985         list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
1986                 list_del(&sdata->list);
1987                 cfg80211_unregister_wdev(&sdata->wdev);
1988                 kfree(sdata);
1989         }
1990 }
1991
1992 static int netdev_notify(struct notifier_block *nb,
1993                          unsigned long state, void *ptr)
1994 {
1995         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1996         struct ieee80211_sub_if_data *sdata;
1997
1998         if (state != NETDEV_CHANGENAME)
1999                 return NOTIFY_DONE;
2000
2001         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
2002                 return NOTIFY_DONE;
2003
2004         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
2005                 return NOTIFY_DONE;
2006
2007         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2008         memcpy(sdata->name, dev->name, IFNAMSIZ);
2009         ieee80211_debugfs_rename_netdev(sdata);
2010
2011         return NOTIFY_OK;
2012 }
2013
2014 static struct notifier_block mac80211_netdev_notifier = {
2015         .notifier_call = netdev_notify,
2016 };
2017
2018 int ieee80211_iface_init(void)
2019 {
2020         return register_netdevice_notifier(&mac80211_netdev_notifier);
2021 }
2022
2023 void ieee80211_iface_exit(void)
2024 {
2025         unregister_netdevice_notifier(&mac80211_netdev_notifier);
2026 }
2027
2028 void ieee80211_vif_inc_num_mcast(struct ieee80211_sub_if_data *sdata)
2029 {
2030         if (sdata->vif.type == NL80211_IFTYPE_AP)
2031                 atomic_inc(&sdata->u.ap.num_mcast_sta);
2032         else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2033                 atomic_inc(&sdata->u.vlan.num_mcast_sta);
2034 }
2035
2036 void ieee80211_vif_dec_num_mcast(struct ieee80211_sub_if_data *sdata)
2037 {
2038         if (sdata->vif.type == NL80211_IFTYPE_AP)
2039                 atomic_dec(&sdata->u.ap.num_mcast_sta);
2040         else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2041                 atomic_dec(&sdata->u.vlan.num_mcast_sta);
2042 }