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         /*
1036          * If the interface goes down while suspended, presumably because
1037          * the device was unplugged and that happens before our resume,
1038          * then the driver is already unconfigured and the remainder of
1039          * this function isn't needed.
1040          * XXX: what about WoWLAN? If the device has software state, e.g.
1041          *      memory allocated, it might expect teardown commands from
1042          *      mac80211 here?
1043          */
1044         if (local->suspended) {
1045                 WARN_ON(local->wowlan);
1046                 WARN_ON(rtnl_dereference(local->monitor_sdata));
1047                 return;
1048         }
1049
1050         switch (sdata->vif.type) {
1051         case NL80211_IFTYPE_AP_VLAN:
1052                 break;
1053         case NL80211_IFTYPE_MONITOR:
1054                 if (local->monitors == 0)
1055                         ieee80211_del_virtual_monitor(local);
1056
1057                 mutex_lock(&local->mtx);
1058                 ieee80211_recalc_idle(local);
1059                 mutex_unlock(&local->mtx);
1060
1061                 if (!(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
1062                         break;
1063
1064                 /* fall through */
1065         default:
1066                 if (going_down)
1067                         drv_remove_interface(local, sdata);
1068         }
1069
1070         ieee80211_recalc_ps(local);
1071
1072         if (cancel_scan)
1073                 flush_delayed_work(&local->scan_work);
1074
1075         if (local->open_count == 0) {
1076                 ieee80211_stop_device(local);
1077
1078                 /* no reconfiguring after stop! */
1079                 return;
1080         }
1081
1082         /* do after stop to avoid reconfiguring when we stop anyway */
1083         ieee80211_configure_filter(local);
1084         ieee80211_hw_config(local, hw_reconf_flags);
1085
1086         if (local->monitors == local->open_count)
1087                 ieee80211_add_virtual_monitor(local);
1088 }
1089
1090 static int ieee80211_stop(struct net_device *dev)
1091 {
1092         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1093
1094         ieee80211_do_stop(sdata, true);
1095
1096         return 0;
1097 }
1098
1099 static void ieee80211_set_multicast_list(struct net_device *dev)
1100 {
1101         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1102         struct ieee80211_local *local = sdata->local;
1103         int allmulti, sdata_allmulti;
1104
1105         allmulti = !!(dev->flags & IFF_ALLMULTI);
1106         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
1107
1108         if (allmulti != sdata_allmulti) {
1109                 if (dev->flags & IFF_ALLMULTI)
1110                         atomic_inc(&local->iff_allmultis);
1111                 else
1112                         atomic_dec(&local->iff_allmultis);
1113                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
1114         }
1115
1116         spin_lock_bh(&local->filter_lock);
1117         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
1118         spin_unlock_bh(&local->filter_lock);
1119         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
1120 }
1121
1122 /*
1123  * Called when the netdev is removed or, by the code below, before
1124  * the interface type changes.
1125  */
1126 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
1127 {
1128         int i;
1129
1130         /* free extra data */
1131         ieee80211_free_keys(sdata, false);
1132
1133         ieee80211_debugfs_remove_netdev(sdata);
1134
1135         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1136                 __skb_queue_purge(&sdata->fragments[i].skb_list);
1137         sdata->fragment_next = 0;
1138
1139         if (ieee80211_vif_is_mesh(&sdata->vif))
1140                 ieee80211_mesh_teardown_sdata(sdata);
1141 }
1142
1143 static void ieee80211_uninit(struct net_device *dev)
1144 {
1145         ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
1146 }
1147
1148 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
1149                                          struct sk_buff *skb,
1150                                          void *accel_priv,
1151                                          select_queue_fallback_t fallback)
1152 {
1153         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
1154 }
1155
1156 static void
1157 ieee80211_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
1158 {
1159         int i;
1160
1161         for_each_possible_cpu(i) {
1162                 const struct pcpu_sw_netstats *tstats;
1163                 u64 rx_packets, rx_bytes, tx_packets, tx_bytes;
1164                 unsigned int start;
1165
1166                 tstats = per_cpu_ptr(dev->tstats, i);
1167
1168                 do {
1169                         start = u64_stats_fetch_begin_irq(&tstats->syncp);
1170                         rx_packets = tstats->rx_packets;
1171                         tx_packets = tstats->tx_packets;
1172                         rx_bytes = tstats->rx_bytes;
1173                         tx_bytes = tstats->tx_bytes;
1174                 } while (u64_stats_fetch_retry_irq(&tstats->syncp, start));
1175
1176                 stats->rx_packets += rx_packets;
1177                 stats->tx_packets += tx_packets;
1178                 stats->rx_bytes   += rx_bytes;
1179                 stats->tx_bytes   += tx_bytes;
1180         }
1181 }
1182
1183 static const struct net_device_ops ieee80211_dataif_ops = {
1184         .ndo_open               = ieee80211_open,
1185         .ndo_stop               = ieee80211_stop,
1186         .ndo_uninit             = ieee80211_uninit,
1187         .ndo_start_xmit         = ieee80211_subif_start_xmit,
1188         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1189         .ndo_set_mac_address    = ieee80211_change_mac,
1190         .ndo_select_queue       = ieee80211_netdev_select_queue,
1191         .ndo_get_stats64        = ieee80211_get_stats64,
1192 };
1193
1194 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
1195                                           struct sk_buff *skb,
1196                                           void *accel_priv,
1197                                           select_queue_fallback_t fallback)
1198 {
1199         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1200         struct ieee80211_local *local = sdata->local;
1201         struct ieee80211_hdr *hdr;
1202         struct ieee80211_radiotap_header *rtap = (void *)skb->data;
1203
1204         if (local->hw.queues < IEEE80211_NUM_ACS)
1205                 return 0;
1206
1207         if (skb->len < 4 ||
1208             skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
1209                 return 0; /* doesn't matter, frame will be dropped */
1210
1211         hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
1212
1213         return ieee80211_select_queue_80211(sdata, skb, hdr);
1214 }
1215
1216 static const struct net_device_ops ieee80211_monitorif_ops = {
1217         .ndo_open               = ieee80211_open,
1218         .ndo_stop               = ieee80211_stop,
1219         .ndo_uninit             = ieee80211_uninit,
1220         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
1221         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1222         .ndo_set_mac_address    = ieee80211_change_mac,
1223         .ndo_select_queue       = ieee80211_monitor_select_queue,
1224         .ndo_get_stats64        = ieee80211_get_stats64,
1225 };
1226
1227 static void ieee80211_if_free(struct net_device *dev)
1228 {
1229         free_percpu(dev->tstats);
1230 }
1231
1232 static void ieee80211_if_setup(struct net_device *dev)
1233 {
1234         ether_setup(dev);
1235         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1236         dev->netdev_ops = &ieee80211_dataif_ops;
1237         dev->needs_free_netdev = true;
1238         dev->priv_destructor = ieee80211_if_free;
1239 }
1240
1241 static void ieee80211_if_setup_no_queue(struct net_device *dev)
1242 {
1243         ieee80211_if_setup(dev);
1244         dev->priv_flags |= IFF_NO_QUEUE;
1245 }
1246
1247 static void ieee80211_iface_work(struct work_struct *work)
1248 {
1249         struct ieee80211_sub_if_data *sdata =
1250                 container_of(work, struct ieee80211_sub_if_data, work);
1251         struct ieee80211_local *local = sdata->local;
1252         struct sk_buff *skb;
1253         struct sta_info *sta;
1254
1255         if (!ieee80211_sdata_running(sdata))
1256                 return;
1257
1258         if (test_bit(SCAN_SW_SCANNING, &local->scanning))
1259                 return;
1260
1261         if (!ieee80211_can_run_worker(local))
1262                 return;
1263
1264         /* first process frames */
1265         while ((skb = skb_dequeue(&sdata->skb_queue))) {
1266                 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1267
1268                 if (ieee80211_is_action(mgmt->frame_control) &&
1269                     mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1270                         int len = skb->len;
1271
1272                         mutex_lock(&local->sta_mtx);
1273                         sta = sta_info_get_bss(sdata, mgmt->sa);
1274                         if (sta) {
1275                                 switch (mgmt->u.action.u.addba_req.action_code) {
1276                                 case WLAN_ACTION_ADDBA_REQ:
1277                                         ieee80211_process_addba_request(
1278                                                         local, sta, mgmt, len);
1279                                         break;
1280                                 case WLAN_ACTION_ADDBA_RESP:
1281                                         ieee80211_process_addba_resp(local, sta,
1282                                                                      mgmt, len);
1283                                         break;
1284                                 case WLAN_ACTION_DELBA:
1285                                         ieee80211_process_delba(sdata, sta,
1286                                                                 mgmt, len);
1287                                         break;
1288                                 default:
1289                                         WARN_ON(1);
1290                                         break;
1291                                 }
1292                         }
1293                         mutex_unlock(&local->sta_mtx);
1294                 } else if (ieee80211_is_action(mgmt->frame_control) &&
1295                            mgmt->u.action.category == WLAN_CATEGORY_VHT) {
1296                         switch (mgmt->u.action.u.vht_group_notif.action_code) {
1297                         case WLAN_VHT_ACTION_OPMODE_NOTIF: {
1298                                 struct ieee80211_rx_status *status;
1299                                 enum nl80211_band band;
1300                                 u8 opmode;
1301
1302                                 status = IEEE80211_SKB_RXCB(skb);
1303                                 band = status->band;
1304                                 opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
1305
1306                                 mutex_lock(&local->sta_mtx);
1307                                 sta = sta_info_get_bss(sdata, mgmt->sa);
1308
1309                                 if (sta)
1310                                         ieee80211_vht_handle_opmode(sdata, sta,
1311                                                                     opmode,
1312                                                                     band);
1313
1314                                 mutex_unlock(&local->sta_mtx);
1315                                 break;
1316                         }
1317                         case WLAN_VHT_ACTION_GROUPID_MGMT:
1318                                 ieee80211_process_mu_groups(sdata, mgmt);
1319                                 break;
1320                         default:
1321                                 WARN_ON(1);
1322                                 break;
1323                         }
1324                 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1325                         struct ieee80211_hdr *hdr = (void *)mgmt;
1326                         /*
1327                          * So the frame isn't mgmt, but frame_control
1328                          * is at the right place anyway, of course, so
1329                          * the if statement is correct.
1330                          *
1331                          * Warn if we have other data frame types here,
1332                          * they must not get here.
1333                          */
1334                         WARN_ON(hdr->frame_control &
1335                                         cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1336                         WARN_ON(!(hdr->seq_ctrl &
1337                                         cpu_to_le16(IEEE80211_SCTL_FRAG)));
1338                         /*
1339                          * This was a fragment of a frame, received while
1340                          * a block-ack session was active. That cannot be
1341                          * right, so terminate the session.
1342                          */
1343                         mutex_lock(&local->sta_mtx);
1344                         sta = sta_info_get_bss(sdata, mgmt->sa);
1345                         if (sta) {
1346                                 u16 tid = *ieee80211_get_qos_ctl(hdr) &
1347                                                 IEEE80211_QOS_CTL_TID_MASK;
1348
1349                                 __ieee80211_stop_rx_ba_session(
1350                                         sta, tid, WLAN_BACK_RECIPIENT,
1351                                         WLAN_REASON_QSTA_REQUIRE_SETUP,
1352                                         true);
1353                         }
1354                         mutex_unlock(&local->sta_mtx);
1355                 } else switch (sdata->vif.type) {
1356                 case NL80211_IFTYPE_STATION:
1357                         ieee80211_sta_rx_queued_mgmt(sdata, skb);
1358                         break;
1359                 case NL80211_IFTYPE_ADHOC:
1360                         ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1361                         break;
1362                 case NL80211_IFTYPE_MESH_POINT:
1363                         if (!ieee80211_vif_is_mesh(&sdata->vif))
1364                                 break;
1365                         ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1366                         break;
1367                 default:
1368                         WARN(1, "frame for unexpected interface type");
1369                         break;
1370                 }
1371
1372                 kfree_skb(skb);
1373         }
1374
1375         /* then other type-dependent work */
1376         switch (sdata->vif.type) {
1377         case NL80211_IFTYPE_STATION:
1378                 ieee80211_sta_work(sdata);
1379                 break;
1380         case NL80211_IFTYPE_ADHOC:
1381                 ieee80211_ibss_work(sdata);
1382                 break;
1383         case NL80211_IFTYPE_MESH_POINT:
1384                 if (!ieee80211_vif_is_mesh(&sdata->vif))
1385                         break;
1386                 ieee80211_mesh_work(sdata);
1387                 break;
1388         case NL80211_IFTYPE_OCB:
1389                 ieee80211_ocb_work(sdata);
1390                 break;
1391         default:
1392                 break;
1393         }
1394 }
1395
1396 static void ieee80211_recalc_smps_work(struct work_struct *work)
1397 {
1398         struct ieee80211_sub_if_data *sdata =
1399                 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1400
1401         ieee80211_recalc_smps(sdata);
1402 }
1403
1404 /*
1405  * Helper function to initialise an interface to a specific type.
1406  */
1407 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1408                                   enum nl80211_iftype type)
1409 {
1410         static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff,
1411                                                     0xff, 0xff, 0xff};
1412
1413         /* clear type-dependent union */
1414         memset(&sdata->u, 0, sizeof(sdata->u));
1415
1416         /* and set some type-dependent values */
1417         sdata->vif.type = type;
1418         sdata->vif.p2p = false;
1419         sdata->wdev.iftype = type;
1420
1421         sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1422         sdata->control_port_no_encrypt = false;
1423         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1424         sdata->vif.bss_conf.idle = true;
1425
1426         sdata->noack_map = 0;
1427
1428         /* only monitor/p2p-device differ */
1429         if (sdata->dev) {
1430                 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1431                 sdata->dev->type = ARPHRD_ETHER;
1432         }
1433
1434         skb_queue_head_init(&sdata->skb_queue);
1435         INIT_WORK(&sdata->work, ieee80211_iface_work);
1436         INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1437         INIT_WORK(&sdata->csa_finalize_work, ieee80211_csa_finalize_work);
1438         INIT_LIST_HEAD(&sdata->assigned_chanctx_list);
1439         INIT_LIST_HEAD(&sdata->reserved_chanctx_list);
1440
1441         switch (type) {
1442         case NL80211_IFTYPE_P2P_GO:
1443                 type = NL80211_IFTYPE_AP;
1444                 sdata->vif.type = type;
1445                 sdata->vif.p2p = true;
1446                 /* fall through */
1447         case NL80211_IFTYPE_AP:
1448                 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1449                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1450                 INIT_WORK(&sdata->u.ap.request_smps_work,
1451                           ieee80211_request_smps_ap_work);
1452                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1453                 sdata->u.ap.req_smps = IEEE80211_SMPS_OFF;
1454                 break;
1455         case NL80211_IFTYPE_P2P_CLIENT:
1456                 type = NL80211_IFTYPE_STATION;
1457                 sdata->vif.type = type;
1458                 sdata->vif.p2p = true;
1459                 /* fall through */
1460         case NL80211_IFTYPE_STATION:
1461                 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1462                 ieee80211_sta_setup_sdata(sdata);
1463                 break;
1464         case NL80211_IFTYPE_OCB:
1465                 sdata->vif.bss_conf.bssid = bssid_wildcard;
1466                 ieee80211_ocb_setup_sdata(sdata);
1467                 break;
1468         case NL80211_IFTYPE_ADHOC:
1469                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1470                 ieee80211_ibss_setup_sdata(sdata);
1471                 break;
1472         case NL80211_IFTYPE_MESH_POINT:
1473                 if (ieee80211_vif_is_mesh(&sdata->vif))
1474                         ieee80211_mesh_init_sdata(sdata);
1475                 break;
1476         case NL80211_IFTYPE_MONITOR:
1477                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1478                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1479                 sdata->u.mntr.flags = MONITOR_FLAG_CONTROL |
1480                                       MONITOR_FLAG_OTHER_BSS;
1481                 break;
1482         case NL80211_IFTYPE_WDS:
1483                 sdata->vif.bss_conf.bssid = NULL;
1484                 break;
1485         case NL80211_IFTYPE_NAN:
1486                 idr_init(&sdata->u.nan.function_inst_ids);
1487                 spin_lock_init(&sdata->u.nan.func_lock);
1488                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1489                 break;
1490         case NL80211_IFTYPE_AP_VLAN:
1491         case NL80211_IFTYPE_P2P_DEVICE:
1492                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1493                 break;
1494         case NL80211_IFTYPE_UNSPECIFIED:
1495         case NUM_NL80211_IFTYPES:
1496                 BUG();
1497                 break;
1498         }
1499
1500         ieee80211_debugfs_add_netdev(sdata);
1501 }
1502
1503 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1504                                            enum nl80211_iftype type)
1505 {
1506         struct ieee80211_local *local = sdata->local;
1507         int ret, err;
1508         enum nl80211_iftype internal_type = type;
1509         bool p2p = false;
1510
1511         ASSERT_RTNL();
1512
1513         if (!local->ops->change_interface)
1514                 return -EBUSY;
1515
1516         switch (sdata->vif.type) {
1517         case NL80211_IFTYPE_AP:
1518         case NL80211_IFTYPE_STATION:
1519         case NL80211_IFTYPE_ADHOC:
1520         case NL80211_IFTYPE_OCB:
1521                 /*
1522                  * Could maybe also all others here?
1523                  * Just not sure how that interacts
1524                  * with the RX/config path e.g. for
1525                  * mesh.
1526                  */
1527                 break;
1528         default:
1529                 return -EBUSY;
1530         }
1531
1532         switch (type) {
1533         case NL80211_IFTYPE_AP:
1534         case NL80211_IFTYPE_STATION:
1535         case NL80211_IFTYPE_ADHOC:
1536         case NL80211_IFTYPE_OCB:
1537                 /*
1538                  * Could probably support everything
1539                  * but WDS here (WDS do_open can fail
1540                  * under memory pressure, which this
1541                  * code isn't prepared to handle).
1542                  */
1543                 break;
1544         case NL80211_IFTYPE_P2P_CLIENT:
1545                 p2p = true;
1546                 internal_type = NL80211_IFTYPE_STATION;
1547                 break;
1548         case NL80211_IFTYPE_P2P_GO:
1549                 p2p = true;
1550                 internal_type = NL80211_IFTYPE_AP;
1551                 break;
1552         default:
1553                 return -EBUSY;
1554         }
1555
1556         ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1557         if (ret)
1558                 return ret;
1559
1560         ieee80211_do_stop(sdata, false);
1561
1562         ieee80211_teardown_sdata(sdata);
1563
1564         ret = drv_change_interface(local, sdata, internal_type, p2p);
1565         if (ret)
1566                 type = ieee80211_vif_type_p2p(&sdata->vif);
1567
1568         /*
1569          * Ignore return value here, there's not much we can do since
1570          * the driver changed the interface type internally already.
1571          * The warnings will hopefully make driver authors fix it :-)
1572          */
1573         ieee80211_check_queues(sdata, type);
1574
1575         ieee80211_setup_sdata(sdata, type);
1576
1577         err = ieee80211_do_open(&sdata->wdev, false);
1578         WARN(err, "type change: do_open returned %d", err);
1579
1580         return ret;
1581 }
1582
1583 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1584                              enum nl80211_iftype type)
1585 {
1586         int ret;
1587
1588         ASSERT_RTNL();
1589
1590         if (type == ieee80211_vif_type_p2p(&sdata->vif))
1591                 return 0;
1592
1593         if (ieee80211_sdata_running(sdata)) {
1594                 ret = ieee80211_runtime_change_iftype(sdata, type);
1595                 if (ret)
1596                         return ret;
1597         } else {
1598                 /* Purge and reset type-dependent state. */
1599                 ieee80211_teardown_sdata(sdata);
1600                 ieee80211_setup_sdata(sdata, type);
1601         }
1602
1603         /* reset some values that shouldn't be kept across type changes */
1604         if (type == NL80211_IFTYPE_STATION)
1605                 sdata->u.mgd.use_4addr = false;
1606
1607         return 0;
1608 }
1609
1610 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1611                                        u8 *perm_addr, enum nl80211_iftype type)
1612 {
1613         struct ieee80211_sub_if_data *sdata;
1614         u64 mask, start, addr, val, inc;
1615         u8 *m;
1616         u8 tmp_addr[ETH_ALEN];
1617         int i;
1618
1619         /* default ... something at least */
1620         memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1621
1622         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1623             local->hw.wiphy->n_addresses <= 1)
1624                 return;
1625
1626         mutex_lock(&local->iflist_mtx);
1627
1628         switch (type) {
1629         case NL80211_IFTYPE_MONITOR:
1630                 /* doesn't matter */
1631                 break;
1632         case NL80211_IFTYPE_WDS:
1633         case NL80211_IFTYPE_AP_VLAN:
1634                 /* match up with an AP interface */
1635                 list_for_each_entry(sdata, &local->interfaces, list) {
1636                         if (sdata->vif.type != NL80211_IFTYPE_AP)
1637                                 continue;
1638                         memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1639                         break;
1640                 }
1641                 /* keep default if no AP interface present */
1642                 break;
1643         case NL80211_IFTYPE_P2P_CLIENT:
1644         case NL80211_IFTYPE_P2P_GO:
1645                 if (ieee80211_hw_check(&local->hw, P2P_DEV_ADDR_FOR_INTF)) {
1646                         list_for_each_entry(sdata, &local->interfaces, list) {
1647                                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1648                                         continue;
1649                                 if (!ieee80211_sdata_running(sdata))
1650                                         continue;
1651                                 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1652                                 goto out_unlock;
1653                         }
1654                 }
1655                 /* otherwise fall through */
1656         default:
1657                 /* assign a new address if possible -- try n_addresses first */
1658                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1659                         bool used = false;
1660
1661                         list_for_each_entry(sdata, &local->interfaces, list) {
1662                                 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr,
1663                                                      sdata->vif.addr)) {
1664                                         used = true;
1665                                         break;
1666                                 }
1667                         }
1668
1669                         if (!used) {
1670                                 memcpy(perm_addr,
1671                                        local->hw.wiphy->addresses[i].addr,
1672                                        ETH_ALEN);
1673                                 break;
1674                         }
1675                 }
1676
1677                 /* try mask if available */
1678                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1679                         break;
1680
1681                 m = local->hw.wiphy->addr_mask;
1682                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1683                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1684                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1685
1686                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1687                         /* not a contiguous mask ... not handled now! */
1688                         pr_info("not contiguous\n");
1689                         break;
1690                 }
1691
1692                 /*
1693                  * Pick address of existing interface in case user changed
1694                  * MAC address manually, default to perm_addr.
1695                  */
1696                 m = local->hw.wiphy->perm_addr;
1697                 list_for_each_entry(sdata, &local->interfaces, list) {
1698                         if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
1699                                 continue;
1700                         m = sdata->vif.addr;
1701                         break;
1702                 }
1703                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1704                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1705                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1706
1707                 inc = 1ULL<<__ffs64(mask);
1708                 val = (start & mask);
1709                 addr = (start & ~mask) | (val & mask);
1710                 do {
1711                         bool used = false;
1712
1713                         tmp_addr[5] = addr >> 0*8;
1714                         tmp_addr[4] = addr >> 1*8;
1715                         tmp_addr[3] = addr >> 2*8;
1716                         tmp_addr[2] = addr >> 3*8;
1717                         tmp_addr[1] = addr >> 4*8;
1718                         tmp_addr[0] = addr >> 5*8;
1719
1720                         val += inc;
1721
1722                         list_for_each_entry(sdata, &local->interfaces, list) {
1723                                 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) {
1724                                         used = true;
1725                                         break;
1726                                 }
1727                         }
1728
1729                         if (!used) {
1730                                 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1731                                 break;
1732                         }
1733                         addr = (start & ~mask) | (val & mask);
1734                 } while (addr != start);
1735
1736                 break;
1737         }
1738
1739  out_unlock:
1740         mutex_unlock(&local->iflist_mtx);
1741 }
1742
1743 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1744                      unsigned char name_assign_type,
1745                      struct wireless_dev **new_wdev, enum nl80211_iftype type,
1746                      struct vif_params *params)
1747 {
1748         struct net_device *ndev = NULL;
1749         struct ieee80211_sub_if_data *sdata = NULL;
1750         struct txq_info *txqi;
1751         void (*if_setup)(struct net_device *dev);
1752         int ret, i;
1753         int txqs = 1;
1754
1755         ASSERT_RTNL();
1756
1757         if (type == NL80211_IFTYPE_P2P_DEVICE || type == NL80211_IFTYPE_NAN) {
1758                 struct wireless_dev *wdev;
1759
1760                 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1761                                 GFP_KERNEL);
1762                 if (!sdata)
1763                         return -ENOMEM;
1764                 wdev = &sdata->wdev;
1765
1766                 sdata->dev = NULL;
1767                 strlcpy(sdata->name, name, IFNAMSIZ);
1768                 ieee80211_assign_perm_addr(local, wdev->address, type);
1769                 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1770         } else {
1771                 int size = ALIGN(sizeof(*sdata) + local->hw.vif_data_size,
1772                                  sizeof(void *));
1773                 int txq_size = 0;
1774
1775                 if (local->ops->wake_tx_queue)
1776                         txq_size += sizeof(struct txq_info) +
1777                                     local->hw.txq_data_size;
1778
1779                 if (local->ops->wake_tx_queue)
1780                         if_setup = ieee80211_if_setup_no_queue;
1781                 else
1782                         if_setup = ieee80211_if_setup;
1783
1784                 if (local->hw.queues >= IEEE80211_NUM_ACS)
1785                         txqs = IEEE80211_NUM_ACS;
1786
1787                 ndev = alloc_netdev_mqs(size + txq_size,
1788                                         name, name_assign_type,
1789                                         if_setup, txqs, 1);
1790                 if (!ndev)
1791                         return -ENOMEM;
1792                 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1793
1794                 ndev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1795                 if (!ndev->tstats) {
1796                         free_netdev(ndev);
1797                         return -ENOMEM;
1798                 }
1799
1800                 ndev->needed_headroom = local->tx_headroom +
1801                                         4*6 /* four MAC addresses */
1802                                         + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1803                                         + 6 /* mesh */
1804                                         + 8 /* rfc1042/bridge tunnel */
1805                                         - ETH_HLEN /* ethernet hard_header_len */
1806                                         + IEEE80211_ENCRYPT_HEADROOM;
1807                 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1808
1809                 ret = dev_alloc_name(ndev, ndev->name);
1810                 if (ret < 0) {
1811                         ieee80211_if_free(ndev);
1812                         free_netdev(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                         free_netdev(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 }