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         if (sdata->vif.type == NL80211_IFTYPE_WDS) {
 680                 /* Create STA entry for the WDS peer */
 681                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
 682                                      GFP_KERNEL);
 683                 if (!sta) {
 684                         res = -ENOMEM;
 685                         goto err_del_interface;
 686                 }
 687
 688                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
 689                 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
 690                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
 691
 692                 res = sta_info_insert(sta);
 693                 if (res) {
 694                         /* STA has been freed */
 695                         goto err_del_interface;
 696                 }
 697
 698                 rate_control_rate_init(sta);
 699                 netif_carrier_on(dev);
 700         } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
 701                 rcu_assign_pointer(local->p2p_sdata, sdata);
 702         }
 703
 704         /*
 705          * set_multicast_list will be invoked by the networking core
 706          * which will check whether any increments here were done in
 707          * error and sync them down to the hardware as filter flags.
 708          */
 709         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 710                 atomic_inc(&local->iff_allmultis);
 711
 712         if (coming_up)
 713                 local->open_count++;
 714
 715         if (hw_reconf_flags)
 716                 ieee80211_hw_config(local, hw_reconf_flags);
 717
 718         ieee80211_recalc_ps(local);
 719
 720         if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
 721             sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
 722             local->ops->wake_tx_queue) {
 723                 /* XXX: for AP_VLAN, actually track AP queues */
 724                 netif_tx_start_all_queues(dev);
 725         } else if (dev) {
 726                 unsigned long flags;
 727                 int n_acs = IEEE80211_NUM_ACS;
 728                 int ac;
 729
 730                 if (local->hw.queues < IEEE80211_NUM_ACS)
 731                         n_acs = 1;
 732
 733                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 734                 if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE ||
 735                     (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 &&
 736                      skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) {
 737                         for (ac = 0; ac < n_acs; ac++) {
 738                                 int ac_queue = sdata->vif.hw_queue[ac];
 739
 740                                 if (local->queue_stop_reasons[ac_queue] == 0 &&
 741                                     skb_queue_empty(&local->pending[ac_queue]))
 742                                         netif_start_subqueue(dev, ac);
 743                         }
 744                 }
 745                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 746         }
 747
 748         return 0;
 749  err_del_interface:
 750         drv_remove_interface(local, sdata);
 751  err_stop:
 752         if (!local->open_count)
 753                 drv_stop(local);
 754  err_del_bss:
 755         sdata->bss = NULL;
 756         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 757                 mutex_lock(&local->mtx);
 758                 list_del(&sdata->u.vlan.list);
 759                 mutex_unlock(&local->mtx);
 760         }
 761         /* might already be clear but that doesn't matter */
 762         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 763         return res;
 764 }
 765
 766 static int ieee80211_open(struct net_device *dev)
 767 {
 768         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 769         int err;
 770
 771         /* fail early if user set an invalid address */
 772         if (!is_valid_ether_addr(dev->dev_addr))
 773                 return -EADDRNOTAVAIL;
 774
 775         err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
 776         if (err)
 777                 return err;
 778
 779         return ieee80211_do_open(&sdata->wdev, true);
 780 }
 781
 782 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
 783                               bool going_down)
 784 {
 785         struct ieee80211_local *local = sdata->local;
 786         struct fq *fq = &local->fq;
 787         unsigned long flags;
 788         struct sk_buff *skb, *tmp;
 789         u32 hw_reconf_flags = 0;
 790         int i, flushed;
 791         struct ps_data *ps;
 792         struct cfg80211_chan_def chandef;
 793         bool cancel_scan;
 794         struct cfg80211_nan_func *func;
 795
 796         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 797
 798         cancel_scan = rcu_access_pointer(local->scan_sdata) == sdata;
 799         if (cancel_scan)
 800                 ieee80211_scan_cancel(local);
 801
 802         /*
 803          * Stop TX on this interface first.
 804          */
 805         if (sdata->dev)
 806                 netif_tx_stop_all_queues(sdata->dev);
 807
 808         ieee80211_roc_purge(local, sdata);
 809
 810         switch (sdata->vif.type) {
 811         case NL80211_IFTYPE_STATION:
 812                 ieee80211_mgd_stop(sdata);
 813                 break;
 814         case NL80211_IFTYPE_ADHOC:
 815                 ieee80211_ibss_stop(sdata);
 816                 break;
 817         case NL80211_IFTYPE_AP:
 818                 cancel_work_sync(&sdata->u.ap.request_smps_work);
 819                 break;
 820         default:
 821                 break;
 822         }
 823
 824         /*
 825          * Remove all stations associated with this interface.
 826          *
 827          * This must be done before calling ops->remove_interface()
 828          * because otherwise we can later invoke ops->sta_notify()
 829          * whenever the STAs are removed, and that invalidates driver
 830          * assumptions about always getting a vif pointer that is valid
 831          * (because if we remove a STA after ops->remove_interface()
 832          * the driver will have removed the vif info already!)
 833          *
 834          * In WDS mode a station must exist here and be flushed, for
 835          * AP_VLANs stations may exist since there's nothing else that
 836          * would have removed them, but in other modes there shouldn't
 837          * be any stations.
 838          */
 839         flushed = sta_info_flush(sdata);
 840         WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
 841                      ((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) ||
 842                       (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1)));
 843
 844         /* don't count this interface for allmulti while it is down */
 845         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 846                 atomic_dec(&local->iff_allmultis);
 847
 848         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 849                 local->fif_pspoll--;
 850                 local->fif_probe_req--;
 851         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 852                 local->fif_probe_req--;
 853         }
 854
 855         if (sdata->dev) {
 856                 netif_addr_lock_bh(sdata->dev);
 857                 spin_lock_bh(&local->filter_lock);
 858                 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
 859                                  sdata->dev->addr_len);
 860                 spin_unlock_bh(&local->filter_lock);
 861                 netif_addr_unlock_bh(sdata->dev);
 862         }
 863
 864         del_timer_sync(&local->dynamic_ps_timer);
 865         cancel_work_sync(&local->dynamic_ps_enable_work);
 866
 867         cancel_work_sync(&sdata->recalc_smps);
 868         sdata_lock(sdata);
 869         mutex_lock(&local->mtx);
 870         sdata->vif.csa_active = false;
 871         if (sdata->vif.type == NL80211_IFTYPE_STATION)
 872                 sdata->u.mgd.csa_waiting_bcn = false;
 873         if (sdata->csa_block_tx) {
 874                 ieee80211_wake_vif_queues(local, sdata,
 875                                           IEEE80211_QUEUE_STOP_REASON_CSA);
 876                 sdata->csa_block_tx = false;
 877         }
 878         mutex_unlock(&local->mtx);
 879         sdata_unlock(sdata);
 880
 881         cancel_work_sync(&sdata->csa_finalize_work);
 882
 883         cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
 884
 885         if (sdata->wdev.cac_started) {
 886                 chandef = sdata->vif.bss_conf.chandef;
 887                 WARN_ON(local->suspended);
 888                 mutex_lock(&local->mtx);
 889                 ieee80211_vif_release_channel(sdata);
 890                 mutex_unlock(&local->mtx);
 891                 cfg80211_cac_event(sdata->dev, &chandef,
 892                                    NL80211_RADAR_CAC_ABORTED,
 893                                    GFP_KERNEL);
 894         }
 895
 896         /* APs need special treatment */
 897         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 898                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
 899
 900                 /* down all dependent devices, that is VLANs */
 901                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
 902                                          u.vlan.list)
 903                         dev_close(vlan->dev);
 904                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
 905         } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 906                 /* remove all packets in parent bc_buf pointing to this dev */
 907                 ps = &sdata->bss->ps;
 908
 909                 spin_lock_irqsave(&ps->bc_buf.lock, flags);
 910                 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
 911                         if (skb->dev == sdata->dev) {
 912                                 __skb_unlink(skb, &ps->bc_buf);
 913                                 local->total_ps_buffered--;
 914                                 ieee80211_free_txskb(&local->hw, skb);
 915                         }
 916                 }
 917                 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
 918         }
 919
 920         if (going_down)
 921                 local->open_count--;
 922
 923         switch (sdata->vif.type) {
 924         case NL80211_IFTYPE_AP_VLAN:
 925                 mutex_lock(&local->mtx);
 926                 list_del(&sdata->u.vlan.list);
 927                 mutex_unlock(&local->mtx);
 928                 RCU_INIT_POINTER(sdata->vif.chanctx_conf, NULL);
 929                 /* see comment in the default case below */
 930                 ieee80211_free_keys(sdata, true);
 931                 /* no need to tell driver */
 932                 break;
 933         case NL80211_IFTYPE_MONITOR:
 934                 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
 935                         local->cooked_mntrs--;
 936                         break;
 937                 }
 938
 939                 local->monitors--;
 940                 if (local->monitors == 0) {
 941                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
 942                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 943                 }
 944
 945                 ieee80211_adjust_monitor_flags(sdata, -1);
 946                 break;
 947         case NL80211_IFTYPE_NAN:
 948                 /* clean all the functions */
 949                 spin_lock_bh(&sdata->u.nan.func_lock);
 950
 951                 idr_for_each_entry(&sdata->u.nan.function_inst_ids, func, i) {
 952                         idr_remove(&sdata->u.nan.function_inst_ids, i);
 953                         cfg80211_free_nan_func(func);
 954                 }
 955                 idr_destroy(&sdata->u.nan.function_inst_ids);
 956
 957                 spin_unlock_bh(&sdata->u.nan.func_lock);
 958                 break;
 959         case NL80211_IFTYPE_P2P_DEVICE:
 960                 /* relies on synchronize_rcu() below */
 961                 RCU_INIT_POINTER(local->p2p_sdata, NULL);
 962                 /* fall through */
 963         default:
 964                 cancel_work_sync(&sdata->work);
 965                 /*
 966                  * When we get here, the interface is marked down.
 967                  * Free the remaining keys, if there are any
 968                  * (which can happen in AP mode if userspace sets
 969                  * keys before the interface is operating, and maybe
 970                  * also in WDS mode)
 971                  *
 972                  * Force the key freeing to always synchronize_net()
 973                  * to wait for the RX path in case it is using this
 974                  * interface enqueuing frames at this very time on
 975                  * another CPU.
 976                  */
 977                 ieee80211_free_keys(sdata, true);
 978                 skb_queue_purge(&sdata->skb_queue);
 979         }
 980
 981         sdata->bss = NULL;
 982
 983         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 984         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 985                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
 986                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 987                         if (info->control.vif == &sdata->vif) {
 988                                 __skb_unlink(skb, &local->pending[i]);
 989                                 ieee80211_free_txskb(&local->hw, skb);
 990                         }
 991                 }
 992         }
 993         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 994
 995         if (sdata->vif.txq) {
 996                 struct txq_info *txqi = to_txq_info(sdata->vif.txq);
 997
 998                 spin_lock_bh(&fq->lock);
 999                 ieee80211_txq_purge(local, txqi);
1000                 spin_unlock_bh(&fq->lock);
1001         }
1002
1003         if (local->open_count == 0)
1004                 ieee80211_clear_tx_pending(local);
1005
1006         /*
1007          * If the interface goes down while suspended, presumably because
1008          * the device was unplugged and that happens before our resume,
1009          * then the driver is already unconfigured and the remainder of
1010          * this function isn't needed.
1011          * XXX: what about WoWLAN? If the device has software state, e.g.
1012          *      memory allocated, it might expect teardown commands from
1013          *      mac80211 here?
1014          */
1015         if (local->suspended) {
1016                 WARN_ON(local->wowlan);
1017                 WARN_ON(rtnl_dereference(local->monitor_sdata));
1018                 return;
1019         }
1020
1021         switch (sdata->vif.type) {
1022         case NL80211_IFTYPE_AP_VLAN:
1023                 break;
1024         case NL80211_IFTYPE_MONITOR:
1025                 if (local->monitors == 0)
1026                         ieee80211_del_virtual_monitor(local);
1027
1028                 mutex_lock(&local->mtx);
1029                 ieee80211_recalc_idle(local);
1030                 mutex_unlock(&local->mtx);
1031
1032                 if (!(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
1033                         break;
1034
1035                 /* fall through */
1036         default:
1037                 if (going_down)
1038                         drv_remove_interface(local, sdata);
1039         }
1040
1041         ieee80211_recalc_ps(local);
1042
1043         if (cancel_scan)
1044                 flush_delayed_work(&local->scan_work);
1045
1046         if (local->open_count == 0) {
1047                 ieee80211_stop_device(local);
1048
1049                 /* no reconfiguring after stop! */
1050                 return;
1051         }
1052
1053         /* do after stop to avoid reconfiguring when we stop anyway */
1054         ieee80211_configure_filter(local);
1055         ieee80211_hw_config(local, hw_reconf_flags);
1056
1057         if (local->monitors == local->open_count)
1058                 ieee80211_add_virtual_monitor(local);
1059 }
1060
1061 static int ieee80211_stop(struct net_device *dev)
1062 {
1063         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1064
1065         ieee80211_do_stop(sdata, true);
1066
1067         return 0;
1068 }
1069
1070 static void ieee80211_set_multicast_list(struct net_device *dev)
1071 {
1072         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1073         struct ieee80211_local *local = sdata->local;
1074         int allmulti, sdata_allmulti;
1075
1076         allmulti = !!(dev->flags & IFF_ALLMULTI);
1077         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
1078
1079         if (allmulti != sdata_allmulti) {
1080                 if (dev->flags & IFF_ALLMULTI)
1081                         atomic_inc(&local->iff_allmultis);
1082                 else
1083                         atomic_dec(&local->iff_allmultis);
1084                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
1085         }
1086
1087         spin_lock_bh(&local->filter_lock);
1088         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
1089         spin_unlock_bh(&local->filter_lock);
1090         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
1091 }
1092
1093 /*
1094  * Called when the netdev is removed or, by the code below, before
1095  * the interface type changes.
1096  */
1097 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
1098 {
1099         int i;
1100
1101         /* free extra data */
1102         ieee80211_free_keys(sdata, false);
1103
1104         ieee80211_debugfs_remove_netdev(sdata);
1105
1106         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1107                 __skb_queue_purge(&sdata->fragments[i].skb_list);
1108         sdata->fragment_next = 0;
1109
1110         if (ieee80211_vif_is_mesh(&sdata->vif))
1111                 ieee80211_mesh_teardown_sdata(sdata);
1112 }
1113
1114 static void ieee80211_uninit(struct net_device *dev)
1115 {
1116         ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
1117 }
1118
1119 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
1120                                          struct sk_buff *skb,
1121                                          void *accel_priv,
1122                                          select_queue_fallback_t fallback)
1123 {
1124         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
1125 }
1126
1127 static void
1128 ieee80211_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
1129 {
1130         int i;
1131
1132         for_each_possible_cpu(i) {
1133                 const struct pcpu_sw_netstats *tstats;
1134                 u64 rx_packets, rx_bytes, tx_packets, tx_bytes;
1135                 unsigned int start;
1136
1137                 tstats = per_cpu_ptr(dev->tstats, i);
1138
1139                 do {
1140                         start = u64_stats_fetch_begin_irq(&tstats->syncp);
1141                         rx_packets = tstats->rx_packets;
1142                         tx_packets = tstats->tx_packets;
1143                         rx_bytes = tstats->rx_bytes;
1144                         tx_bytes = tstats->tx_bytes;
1145                 } while (u64_stats_fetch_retry_irq(&tstats->syncp, start));
1146
1147                 stats->rx_packets += rx_packets;
1148                 stats->tx_packets += tx_packets;
1149                 stats->rx_bytes   += rx_bytes;
1150                 stats->tx_bytes   += tx_bytes;
1151         }
1152 }
1153
1154 static const struct net_device_ops ieee80211_dataif_ops = {
1155         .ndo_open               = ieee80211_open,
1156         .ndo_stop               = ieee80211_stop,
1157         .ndo_uninit             = ieee80211_uninit,
1158         .ndo_start_xmit         = ieee80211_subif_start_xmit,
1159         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1160         .ndo_set_mac_address    = ieee80211_change_mac,
1161         .ndo_select_queue       = ieee80211_netdev_select_queue,
1162         .ndo_get_stats64        = ieee80211_get_stats64,
1163 };
1164
1165 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
1166                                           struct sk_buff *skb,
1167                                           void *accel_priv,
1168                                           select_queue_fallback_t fallback)
1169 {
1170         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1171         struct ieee80211_local *local = sdata->local;
1172         struct ieee80211_hdr *hdr;
1173         struct ieee80211_radiotap_header *rtap = (void *)skb->data;
1174
1175         if (local->hw.queues < IEEE80211_NUM_ACS)
1176                 return 0;
1177
1178         if (skb->len < 4 ||
1179             skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
1180                 return 0; /* doesn't matter, frame will be dropped */
1181
1182         hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
1183
1184         return ieee80211_select_queue_80211(sdata, skb, hdr);
1185 }
1186
1187 static const struct net_device_ops ieee80211_monitorif_ops = {
1188         .ndo_open               = ieee80211_open,
1189         .ndo_stop               = ieee80211_stop,
1190         .ndo_uninit             = ieee80211_uninit,
1191         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
1192         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1193         .ndo_set_mac_address    = ieee80211_change_mac,
1194         .ndo_select_queue       = ieee80211_monitor_select_queue,
1195         .ndo_get_stats64        = ieee80211_get_stats64,
1196 };
1197
1198 static void ieee80211_if_free(struct net_device *dev)
1199 {
1200         free_percpu(dev->tstats);
1201         free_netdev(dev);
1202 }
1203
1204 static void ieee80211_if_setup(struct net_device *dev)
1205 {
1206         ether_setup(dev);
1207         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1208         dev->netdev_ops = &ieee80211_dataif_ops;
1209         dev->destructor = ieee80211_if_free;
1210 }
1211
1212 static void ieee80211_if_setup_no_queue(struct net_device *dev)
1213 {
1214         ieee80211_if_setup(dev);
1215         dev->priv_flags |= IFF_NO_QUEUE;
1216 }
1217
1218 static void ieee80211_iface_work(struct work_struct *work)
1219 {
1220         struct ieee80211_sub_if_data *sdata =
1221                 container_of(work, struct ieee80211_sub_if_data, work);
1222         struct ieee80211_local *local = sdata->local;
1223         struct sk_buff *skb;
1224         struct sta_info *sta;
1225         struct ieee80211_ra_tid *ra_tid;
1226         struct ieee80211_rx_agg *rx_agg;
1227
1228         if (!ieee80211_sdata_running(sdata))
1229                 return;
1230
1231         if (test_bit(SCAN_SW_SCANNING, &local->scanning))
1232                 return;
1233
1234         if (!ieee80211_can_run_worker(local))
1235                 return;
1236
1237         /* first process frames */
1238         while ((skb = skb_dequeue(&sdata->skb_queue))) {
1239                 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1240
1241                 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
1242                         ra_tid = (void *)&skb->cb;
1243                         ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
1244                                                  ra_tid->tid);
1245                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
1246                         ra_tid = (void *)&skb->cb;
1247                         ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
1248                                                 ra_tid->tid);
1249                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_RX_AGG_START) {
1250                         rx_agg = (void *)&skb->cb;
1251                         mutex_lock(&local->sta_mtx);
1252                         sta = sta_info_get_bss(sdata, rx_agg->addr);
1253                         if (sta)
1254                                 __ieee80211_start_rx_ba_session(sta,
1255                                                 0, 0, 0, 1, rx_agg->tid,
1256                                                 IEEE80211_MAX_AMPDU_BUF,
1257                                                 false, true);
1258                         mutex_unlock(&local->sta_mtx);
1259                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_RX_AGG_STOP) {
1260                         rx_agg = (void *)&skb->cb;
1261                         mutex_lock(&local->sta_mtx);
1262                         sta = sta_info_get_bss(sdata, rx_agg->addr);
1263                         if (sta)
1264                                 __ieee80211_stop_rx_ba_session(sta,
1265                                                         rx_agg->tid,
1266                                                         WLAN_BACK_RECIPIENT, 0,
1267                                                         false);
1268                         mutex_unlock(&local->sta_mtx);
1269                 } else if (ieee80211_is_action(mgmt->frame_control) &&
1270                            mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1271                         int len = skb->len;
1272
1273                         mutex_lock(&local->sta_mtx);
1274                         sta = sta_info_get_bss(sdata, mgmt->sa);
1275                         if (sta) {
1276                                 switch (mgmt->u.action.u.addba_req.action_code) {
1277                                 case WLAN_ACTION_ADDBA_REQ:
1278                                         ieee80211_process_addba_request(
1279                                                         local, sta, mgmt, len);
1280                                         break;
1281                                 case WLAN_ACTION_ADDBA_RESP:
1282                                         ieee80211_process_addba_resp(local, sta,
1283                                                                      mgmt, len);
1284                                         break;
1285                                 case WLAN_ACTION_DELBA:
1286                                         ieee80211_process_delba(sdata, sta,
1287                                                                 mgmt, len);
1288                                         break;
1289                                 default:
1290                                         WARN_ON(1);
1291                                         break;
1292                                 }
1293                         }
1294                         mutex_unlock(&local->sta_mtx);
1295                 } else if (ieee80211_is_action(mgmt->frame_control) &&
1296                            mgmt->u.action.category == WLAN_CATEGORY_VHT) {
1297                         switch (mgmt->u.action.u.vht_group_notif.action_code) {
1298                         case WLAN_VHT_ACTION_OPMODE_NOTIF: {
1299                                 struct ieee80211_rx_status *status;
1300                                 enum nl80211_band band;
1301                                 u8 opmode;
1302
1303                                 status = IEEE80211_SKB_RXCB(skb);
1304                                 band = status->band;
1305                                 opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
1306
1307                                 mutex_lock(&local->sta_mtx);
1308                                 sta = sta_info_get_bss(sdata, mgmt->sa);
1309
1310                                 if (sta)
1311                                         ieee80211_vht_handle_opmode(sdata, sta,
1312                                                                     opmode,
1313                                                                     band);
1314
1315                                 mutex_unlock(&local->sta_mtx);
1316                                 break;
1317                         }
1318                         case WLAN_VHT_ACTION_GROUPID_MGMT:
1319                                 ieee80211_process_mu_groups(sdata, mgmt);
1320                                 break;
1321                         default:
1322                                 WARN_ON(1);
1323                                 break;
1324                         }
1325                 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1326                         struct ieee80211_hdr *hdr = (void *)mgmt;
1327                         /*
1328                          * So the frame isn't mgmt, but frame_control
1329                          * is at the right place anyway, of course, so
1330                          * the if statement is correct.
1331                          *
1332                          * Warn if we have other data frame types here,
1333                          * they must not get here.
1334                          */
1335                         WARN_ON(hdr->frame_control &
1336                                         cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1337                         WARN_ON(!(hdr->seq_ctrl &
1338                                         cpu_to_le16(IEEE80211_SCTL_FRAG)));
1339                         /*
1340                          * This was a fragment of a frame, received while
1341                          * a block-ack session was active. That cannot be
1342                          * right, so terminate the session.
1343                          */
1344                         mutex_lock(&local->sta_mtx);
1345                         sta = sta_info_get_bss(sdata, mgmt->sa);
1346                         if (sta) {
1347                                 u16 tid = *ieee80211_get_qos_ctl(hdr) &
1348                                                 IEEE80211_QOS_CTL_TID_MASK;
1349
1350                                 __ieee80211_stop_rx_ba_session(
1351                                         sta, tid, WLAN_BACK_RECIPIENT,
1352                                         WLAN_REASON_QSTA_REQUIRE_SETUP,
1353                                         true);
1354                         }
1355                         mutex_unlock(&local->sta_mtx);
1356                 } else switch (sdata->vif.type) {
1357                 case NL80211_IFTYPE_STATION:
1358                         ieee80211_sta_rx_queued_mgmt(sdata, skb);
1359                         break;
1360                 case NL80211_IFTYPE_ADHOC:
1361                         ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1362                         break;
1363                 case NL80211_IFTYPE_MESH_POINT:
1364                         if (!ieee80211_vif_is_mesh(&sdata->vif))
1365                                 break;
1366                         ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1367                         break;
1368                 default:
1369                         WARN(1, "frame for unexpected interface type");
1370                         break;
1371                 }
1372
1373                 kfree_skb(skb);
1374         }
1375
1376         /* then other type-dependent work */
1377         switch (sdata->vif.type) {
1378         case NL80211_IFTYPE_STATION:
1379                 ieee80211_sta_work(sdata);
1380                 break;
1381         case NL80211_IFTYPE_ADHOC:
1382                 ieee80211_ibss_work(sdata);
1383                 break;
1384         case NL80211_IFTYPE_MESH_POINT:
1385                 if (!ieee80211_vif_is_mesh(&sdata->vif))
1386                         break;
1387                 ieee80211_mesh_work(sdata);
1388                 break;
1389         case NL80211_IFTYPE_OCB:
1390                 ieee80211_ocb_work(sdata);
1391                 break;
1392         default:
1393                 break;
1394         }
1395 }
1396
1397 static void ieee80211_recalc_smps_work(struct work_struct *work)
1398 {
1399         struct ieee80211_sub_if_data *sdata =
1400                 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1401
1402         ieee80211_recalc_smps(sdata);
1403 }
1404
1405 /*
1406  * Helper function to initialise an interface to a specific type.
1407  */
1408 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1409                                   enum nl80211_iftype type)
1410 {
1411         static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff,
1412                                                     0xff, 0xff, 0xff};
1413
1414         /* clear type-dependent union */
1415         memset(&sdata->u, 0, sizeof(sdata->u));
1416
1417         /* and set some type-dependent values */
1418         sdata->vif.type = type;
1419         sdata->vif.p2p = false;
1420         sdata->wdev.iftype = type;
1421
1422         sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1423         sdata->control_port_no_encrypt = false;
1424         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1425         sdata->vif.bss_conf.idle = true;
1426
1427         sdata->noack_map = 0;
1428
1429         /* only monitor/p2p-device differ */
1430         if (sdata->dev) {
1431                 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1432                 sdata->dev->type = ARPHRD_ETHER;
1433         }
1434
1435         skb_queue_head_init(&sdata->skb_queue);
1436         INIT_WORK(&sdata->work, ieee80211_iface_work);
1437         INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1438         INIT_WORK(&sdata->csa_finalize_work, ieee80211_csa_finalize_work);
1439         INIT_LIST_HEAD(&sdata->assigned_chanctx_list);
1440         INIT_LIST_HEAD(&sdata->reserved_chanctx_list);
1441
1442         switch (type) {
1443         case NL80211_IFTYPE_P2P_GO:
1444                 type = NL80211_IFTYPE_AP;
1445                 sdata->vif.type = type;
1446                 sdata->vif.p2p = true;
1447                 /* fall through */
1448         case NL80211_IFTYPE_AP:
1449                 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1450                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1451                 INIT_WORK(&sdata->u.ap.request_smps_work,
1452                           ieee80211_request_smps_ap_work);
1453                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1454                 sdata->u.ap.req_smps = IEEE80211_SMPS_OFF;
1455                 break;
1456         case NL80211_IFTYPE_P2P_CLIENT:
1457                 type = NL80211_IFTYPE_STATION;
1458                 sdata->vif.type = type;
1459                 sdata->vif.p2p = true;
1460                 /* fall through */
1461         case NL80211_IFTYPE_STATION:
1462                 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1463                 ieee80211_sta_setup_sdata(sdata);
1464                 break;
1465         case NL80211_IFTYPE_OCB:
1466                 sdata->vif.bss_conf.bssid = bssid_wildcard;
1467                 ieee80211_ocb_setup_sdata(sdata);
1468                 break;
1469         case NL80211_IFTYPE_ADHOC:
1470                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1471                 ieee80211_ibss_setup_sdata(sdata);
1472                 break;
1473         case NL80211_IFTYPE_MESH_POINT:
1474                 if (ieee80211_vif_is_mesh(&sdata->vif))
1475                         ieee80211_mesh_init_sdata(sdata);
1476                 break;
1477         case NL80211_IFTYPE_MONITOR:
1478                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1479                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1480                 sdata->u.mntr.flags = MONITOR_FLAG_CONTROL |
1481                                       MONITOR_FLAG_OTHER_BSS;
1482                 break;
1483         case NL80211_IFTYPE_WDS:
1484                 sdata->vif.bss_conf.bssid = NULL;
1485                 break;
1486         case NL80211_IFTYPE_NAN:
1487                 idr_init(&sdata->u.nan.function_inst_ids);
1488                 spin_lock_init(&sdata->u.nan.func_lock);
1489                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1490                 break;
1491         case NL80211_IFTYPE_AP_VLAN:
1492         case NL80211_IFTYPE_P2P_DEVICE:
1493                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1494                 break;
1495         case NL80211_IFTYPE_UNSPECIFIED:
1496         case NUM_NL80211_IFTYPES:
1497                 BUG();
1498                 break;
1499         }
1500
1501         ieee80211_debugfs_add_netdev(sdata);
1502 }
1503
1504 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1505                                            enum nl80211_iftype type)
1506 {
1507         struct ieee80211_local *local = sdata->local;
1508         int ret, err;
1509         enum nl80211_iftype internal_type = type;
1510         bool p2p = false;
1511
1512         ASSERT_RTNL();
1513
1514         if (!local->ops->change_interface)
1515                 return -EBUSY;
1516
1517         switch (sdata->vif.type) {
1518         case NL80211_IFTYPE_AP:
1519         case NL80211_IFTYPE_STATION:
1520         case NL80211_IFTYPE_ADHOC:
1521         case NL80211_IFTYPE_OCB:
1522                 /*
1523                  * Could maybe also all others here?
1524                  * Just not sure how that interacts
1525                  * with the RX/config path e.g. for
1526                  * mesh.
1527                  */
1528                 break;
1529         default:
1530                 return -EBUSY;
1531         }
1532
1533         switch (type) {
1534         case NL80211_IFTYPE_AP:
1535         case NL80211_IFTYPE_STATION:
1536         case NL80211_IFTYPE_ADHOC:
1537         case NL80211_IFTYPE_OCB:
1538                 /*
1539                  * Could probably support everything
1540                  * but WDS here (WDS do_open can fail
1541                  * under memory pressure, which this
1542                  * code isn't prepared to handle).
1543                  */
1544                 break;
1545         case NL80211_IFTYPE_P2P_CLIENT:
1546                 p2p = true;
1547                 internal_type = NL80211_IFTYPE_STATION;
1548                 break;
1549         case NL80211_IFTYPE_P2P_GO:
1550                 p2p = true;
1551                 internal_type = NL80211_IFTYPE_AP;
1552                 break;
1553         default:
1554                 return -EBUSY;
1555         }
1556
1557         ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1558         if (ret)
1559                 return ret;
1560
1561         ieee80211_do_stop(sdata, false);
1562
1563         ieee80211_teardown_sdata(sdata);
1564
1565         ret = drv_change_interface(local, sdata, internal_type, p2p);
1566         if (ret)
1567                 type = ieee80211_vif_type_p2p(&sdata->vif);
1568
1569         /*
1570          * Ignore return value here, there's not much we can do since
1571          * the driver changed the interface type internally already.
1572          * The warnings will hopefully make driver authors fix it :-)
1573          */
1574         ieee80211_check_queues(sdata, type);
1575
1576         ieee80211_setup_sdata(sdata, type);
1577
1578         err = ieee80211_do_open(&sdata->wdev, false);
1579         WARN(err, "type change: do_open returned %d", err);
1580
1581         return ret;
1582 }
1583
1584 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1585                              enum nl80211_iftype type)
1586 {
1587         int ret;
1588
1589         ASSERT_RTNL();
1590
1591         if (type == ieee80211_vif_type_p2p(&sdata->vif))
1592                 return 0;
1593
1594         if (ieee80211_sdata_running(sdata)) {
1595                 ret = ieee80211_runtime_change_iftype(sdata, type);
1596                 if (ret)
1597                         return ret;
1598         } else {
1599                 /* Purge and reset type-dependent state. */
1600                 ieee80211_teardown_sdata(sdata);
1601                 ieee80211_setup_sdata(sdata, type);
1602         }
1603
1604         /* reset some values that shouldn't be kept across type changes */
1605         if (type == NL80211_IFTYPE_STATION)
1606                 sdata->u.mgd.use_4addr = false;
1607
1608         return 0;
1609 }
1610
1611 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1612                                        u8 *perm_addr, enum nl80211_iftype type)
1613 {
1614         struct ieee80211_sub_if_data *sdata;
1615         u64 mask, start, addr, val, inc;
1616         u8 *m;
1617         u8 tmp_addr[ETH_ALEN];
1618         int i;
1619
1620         /* default ... something at least */
1621         memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1622
1623         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1624             local->hw.wiphy->n_addresses <= 1)
1625                 return;
1626
1627         mutex_lock(&local->iflist_mtx);
1628
1629         switch (type) {
1630         case NL80211_IFTYPE_MONITOR:
1631                 /* doesn't matter */
1632                 break;
1633         case NL80211_IFTYPE_WDS:
1634         case NL80211_IFTYPE_AP_VLAN:
1635                 /* match up with an AP interface */
1636                 list_for_each_entry(sdata, &local->interfaces, list) {
1637                         if (sdata->vif.type != NL80211_IFTYPE_AP)
1638                                 continue;
1639                         memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1640                         break;
1641                 }
1642                 /* keep default if no AP interface present */
1643                 break;
1644         case NL80211_IFTYPE_P2P_CLIENT:
1645         case NL80211_IFTYPE_P2P_GO:
1646                 if (ieee80211_hw_check(&local->hw, P2P_DEV_ADDR_FOR_INTF)) {
1647                         list_for_each_entry(sdata, &local->interfaces, list) {
1648                                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1649                                         continue;
1650                                 if (!ieee80211_sdata_running(sdata))
1651                                         continue;
1652                                 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1653                                 goto out_unlock;
1654                         }
1655                 }
1656                 /* otherwise fall through */
1657         default:
1658                 /* assign a new address if possible -- try n_addresses first */
1659                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1660                         bool used = false;
1661
1662                         list_for_each_entry(sdata, &local->interfaces, list) {
1663                                 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr,
1664                                                      sdata->vif.addr)) {
1665                                         used = true;
1666                                         break;
1667                                 }
1668                         }
1669
1670                         if (!used) {
1671                                 memcpy(perm_addr,
1672                                        local->hw.wiphy->addresses[i].addr,
1673                                        ETH_ALEN);
1674                                 break;
1675                         }
1676                 }
1677
1678                 /* try mask if available */
1679                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1680                         break;
1681
1682                 m = local->hw.wiphy->addr_mask;
1683                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1684                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1685                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1686
1687                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1688                         /* not a contiguous mask ... not handled now! */
1689                         pr_info("not contiguous\n");
1690                         break;
1691                 }
1692
1693                 /*
1694                  * Pick address of existing interface in case user changed
1695                  * MAC address manually, default to perm_addr.
1696                  */
1697                 m = local->hw.wiphy->perm_addr;
1698                 list_for_each_entry(sdata, &local->interfaces, list) {
1699                         if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
1700                                 continue;
1701                         m = sdata->vif.addr;
1702                         break;
1703                 }
1704                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1705                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1706                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1707
1708                 inc = 1ULL<<__ffs64(mask);
1709                 val = (start & mask);
1710                 addr = (start & ~mask) | (val & mask);
1711                 do {
1712                         bool used = false;
1713
1714                         tmp_addr[5] = addr >> 0*8;
1715                         tmp_addr[4] = addr >> 1*8;
1716                         tmp_addr[3] = addr >> 2*8;
1717                         tmp_addr[2] = addr >> 3*8;
1718                         tmp_addr[1] = addr >> 4*8;
1719                         tmp_addr[0] = addr >> 5*8;
1720
1721                         val += inc;
1722
1723                         list_for_each_entry(sdata, &local->interfaces, list) {
1724                                 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) {
1725                                         used = true;
1726                                         break;
1727                                 }
1728                         }
1729
1730                         if (!used) {
1731                                 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1732                                 break;
1733                         }
1734                         addr = (start & ~mask) | (val & mask);
1735                 } while (addr != start);
1736
1737                 break;
1738         }
1739
1740  out_unlock:
1741         mutex_unlock(&local->iflist_mtx);
1742 }
1743
1744 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1745                      unsigned char name_assign_type,
1746                      struct wireless_dev **new_wdev, enum nl80211_iftype type,
1747                      struct vif_params *params)
1748 {
1749         struct net_device *ndev = NULL;
1750         struct ieee80211_sub_if_data *sdata = NULL;
1751         struct txq_info *txqi;
1752         void (*if_setup)(struct net_device *dev);
1753         int ret, i;
1754         int txqs = 1;
1755
1756         ASSERT_RTNL();
1757
1758         if (type == NL80211_IFTYPE_P2P_DEVICE || type == NL80211_IFTYPE_NAN) {
1759                 struct wireless_dev *wdev;
1760
1761                 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1762                                 GFP_KERNEL);
1763                 if (!sdata)
1764                         return -ENOMEM;
1765                 wdev = &sdata->wdev;
1766
1767                 sdata->dev = NULL;
1768                 strlcpy(sdata->name, name, IFNAMSIZ);
1769                 ieee80211_assign_perm_addr(local, wdev->address, type);
1770                 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1771         } else {
1772                 int size = ALIGN(sizeof(*sdata) + local->hw.vif_data_size,
1773                                  sizeof(void *));
1774                 int txq_size = 0;
1775
1776                 if (local->ops->wake_tx_queue)
1777                         txq_size += sizeof(struct txq_info) +
1778                                     local->hw.txq_data_size;
1779
1780                 if (local->ops->wake_tx_queue)
1781                         if_setup = ieee80211_if_setup_no_queue;
1782                 else
1783                         if_setup = ieee80211_if_setup;
1784
1785                 if (local->hw.queues >= IEEE80211_NUM_ACS)
1786                         txqs = IEEE80211_NUM_ACS;
1787
1788                 ndev = alloc_netdev_mqs(size + txq_size,
1789                                         name, name_assign_type,
1790                                         if_setup, txqs, 1);
1791                 if (!ndev)
1792                         return -ENOMEM;
1793                 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1794
1795                 ndev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1796                 if (!ndev->tstats) {
1797                         free_netdev(ndev);
1798                         return -ENOMEM;
1799                 }
1800
1801                 ndev->needed_headroom = local->tx_headroom +
1802                                         4*6 /* four MAC addresses */
1803                                         + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1804                                         + 6 /* mesh */
1805                                         + 8 /* rfc1042/bridge tunnel */
1806                                         - ETH_HLEN /* ethernet hard_header_len */
1807                                         + IEEE80211_ENCRYPT_HEADROOM;
1808                 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1809
1810                 ret = dev_alloc_name(ndev, ndev->name);
1811                 if (ret < 0) {
1812                         ieee80211_if_free(ndev);
1813                         return ret;
1814                 }
1815
1816                 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1817                 if (params && is_valid_ether_addr(params->macaddr))
1818                         memcpy(ndev->dev_addr, params->macaddr, ETH_ALEN);
1819                 else
1820                         memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1821                 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1822
1823                 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1824                 sdata = netdev_priv(ndev);
1825                 ndev->ieee80211_ptr = &sdata->wdev;
1826                 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1827                 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1828
1829                 if (txq_size) {
1830                         txqi = netdev_priv(ndev) + size;
1831                         ieee80211_txq_init(sdata, NULL, txqi, 0);
1832                 }
1833
1834                 sdata->dev = ndev;
1835         }
1836
1837         /* initialise type-independent data */
1838         sdata->wdev.wiphy = local->hw.wiphy;
1839         sdata->local = local;
1840
1841         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1842                 skb_queue_head_init(&sdata->fragments[i].skb_list);
1843
1844         INIT_LIST_HEAD(&sdata->key_list);
1845
1846         INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
1847                           ieee80211_dfs_cac_timer_work);
1848         INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
1849                           ieee80211_delayed_tailroom_dec);
1850
1851         for (i = 0; i < NUM_NL80211_BANDS; i++) {
1852                 struct ieee80211_supported_band *sband;
1853                 sband = local->hw.wiphy->bands[i];
1854                 sdata->rc_rateidx_mask[i] =
1855                         sband ? (1 << sband->n_bitrates) - 1 : 0;
1856                 if (sband) {
1857                         __le16 cap;
1858                         u16 *vht_rate_mask;
1859
1860                         memcpy(sdata->rc_rateidx_mcs_mask[i],
1861                                sband->ht_cap.mcs.rx_mask,
1862                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1863
1864                         cap = sband->vht_cap.vht_mcs.rx_mcs_map;
1865                         vht_rate_mask = sdata->rc_rateidx_vht_mcs_mask[i];
1866                         ieee80211_get_vht_mask_from_cap(cap, vht_rate_mask);
1867                 } else {
1868                         memset(sdata->rc_rateidx_mcs_mask[i], 0,
1869                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1870                         memset(sdata->rc_rateidx_vht_mcs_mask[i], 0,
1871                                sizeof(sdata->rc_rateidx_vht_mcs_mask[i]));
1872                 }
1873         }
1874
1875         ieee80211_set_default_queues(sdata);
1876
1877         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1878         sdata->user_power_level = local->user_power_level;
1879
1880         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1881
1882         /* setup type-dependent data */
1883         ieee80211_setup_sdata(sdata, type);
1884
1885         if (ndev) {
1886                 if (params) {
1887                         ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1888                         if (type == NL80211_IFTYPE_STATION)
1889                                 sdata->u.mgd.use_4addr = params->use_4addr;
1890                 }
1891
1892                 ndev->features |= local->hw.netdev_features;
1893
1894                 netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops);
1895
1896                 /* MTU range: 256 - 2304 */
1897                 ndev->min_mtu = 256;
1898                 ndev->max_mtu = IEEE80211_MAX_DATA_LEN;
1899
1900                 ret = register_netdevice(ndev);
1901                 if (ret) {
1902                         ieee80211_if_free(ndev);
1903                         return ret;
1904                 }
1905         }
1906
1907         mutex_lock(&local->iflist_mtx);
1908         list_add_tail_rcu(&sdata->list, &local->interfaces);
1909         mutex_unlock(&local->iflist_mtx);
1910
1911         if (new_wdev)
1912                 *new_wdev = &sdata->wdev;
1913
1914         return 0;
1915 }
1916
1917 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1918 {
1919         ASSERT_RTNL();
1920
1921         mutex_lock(&sdata->local->iflist_mtx);
1922         list_del_rcu(&sdata->list);
1923         mutex_unlock(&sdata->local->iflist_mtx);
1924
1925         synchronize_rcu();
1926
1927         if (sdata->dev) {
1928                 unregister_netdevice(sdata->dev);
1929         } else {
1930                 cfg80211_unregister_wdev(&sdata->wdev);
1931                 ieee80211_teardown_sdata(sdata);
1932                 kfree(sdata);
1933         }
1934 }
1935
1936 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
1937 {
1938         if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
1939                 return;
1940         ieee80211_do_stop(sdata, true);
1941 }
1942
1943 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1944 {
1945         struct ieee80211_sub_if_data *sdata, *tmp;
1946         LIST_HEAD(unreg_list);
1947         LIST_HEAD(wdev_list);
1948
1949         ASSERT_RTNL();
1950
1951         /* Before destroying the interfaces, make sure they're all stopped so
1952          * that the hardware is stopped. Otherwise, the driver might still be
1953          * iterating the interfaces during the shutdown, e.g. from a worker
1954          * or from RX processing or similar, and if it does so (using atomic
1955          * iteration) while we're manipulating the list, the iteration will
1956          * crash.
1957          *
1958          * After this, the hardware should be stopped and the driver should
1959          * have stopped all of its activities, so that we can do RCU-unaware
1960          * manipulations of the interface list below.
1961          */
1962         cfg80211_shutdown_all_interfaces(local->hw.wiphy);
1963
1964         WARN(local->open_count, "%s: open count remains %d\n",
1965              wiphy_name(local->hw.wiphy), local->open_count);
1966
1967         mutex_lock(&local->iflist_mtx);
1968         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1969                 list_del(&sdata->list);
1970
1971                 if (sdata->dev)
1972                         unregister_netdevice_queue(sdata->dev, &unreg_list);
1973                 else
1974                         list_add(&sdata->list, &wdev_list);
1975         }
1976         mutex_unlock(&local->iflist_mtx);
1977         unregister_netdevice_many(&unreg_list);
1978
1979         list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
1980                 list_del(&sdata->list);
1981                 cfg80211_unregister_wdev(&sdata->wdev);
1982                 kfree(sdata);
1983         }
1984 }
1985
1986 static int netdev_notify(struct notifier_block *nb,
1987                          unsigned long state, void *ptr)
1988 {
1989         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1990         struct ieee80211_sub_if_data *sdata;
1991
1992         if (state != NETDEV_CHANGENAME)
1993                 return NOTIFY_DONE;
1994
1995         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1996                 return NOTIFY_DONE;
1997
1998         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1999                 return NOTIFY_DONE;
2000
2001         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2002         memcpy(sdata->name, dev->name, IFNAMSIZ);
2003         ieee80211_debugfs_rename_netdev(sdata);
2004
2005         return NOTIFY_OK;
2006 }
2007
2008 static struct notifier_block mac80211_netdev_notifier = {
2009         .notifier_call = netdev_notify,
2010 };
2011
2012 int ieee80211_iface_init(void)
2013 {
2014         return register_netdevice_notifier(&mac80211_netdev_notifier);
2015 }
2016
2017 void ieee80211_iface_exit(void)
2018 {
2019         unregister_netdevice_notifier(&mac80211_netdev_notifier);
2020 }
2021
2022 void ieee80211_vif_inc_num_mcast(struct ieee80211_sub_if_data *sdata)
2023 {
2024         if (sdata->vif.type == NL80211_IFTYPE_AP)
2025                 atomic_inc(&sdata->u.ap.num_mcast_sta);
2026         else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2027                 atomic_inc(&sdata->u.vlan.num_mcast_sta);
2028 }
2029
2030 void ieee80211_vif_dec_num_mcast(struct ieee80211_sub_if_data *sdata)
2031 {
2032         if (sdata->vif.type == NL80211_IFTYPE_AP)
2033                 atomic_dec(&sdata->u.ap.num_mcast_sta);
2034         else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2035                 atomic_dec(&sdata->u.vlan.num_mcast_sta);
2036 }