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_change_mtu(struct net_device *dev, int new_mtu)
 155 {
 156         if (new_mtu < 256 || new_mtu > IEEE80211_MAX_DATA_LEN)
 157                 return -EINVAL;
 158
 159         dev->mtu = new_mtu;
 160         return 0;
 161 }
 162
 163 static int ieee80211_verify_mac(struct ieee80211_sub_if_data *sdata, u8 *addr,
 164                                 bool check_dup)
 165 {
 166         struct ieee80211_local *local = sdata->local;
 167         struct ieee80211_sub_if_data *iter;
 168         u64 new, mask, tmp;
 169         u8 *m;
 170         int ret = 0;
 171
 172         if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
 173                 return 0;
 174
 175         m = addr;
 176         new =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 177                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 178                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 179
 180         m = local->hw.wiphy->addr_mask;
 181         mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 182                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 183                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 184
 185         if (!check_dup)
 186                 return ret;
 187
 188         mutex_lock(&local->iflist_mtx);
 189         list_for_each_entry(iter, &local->interfaces, list) {
 190                 if (iter == sdata)
 191                         continue;
 192
 193                 if (iter->vif.type == NL80211_IFTYPE_MONITOR &&
 194                     !(iter->u.mntr.flags & MONITOR_FLAG_ACTIVE))
 195                         continue;
 196
 197                 m = iter->vif.addr;
 198                 tmp =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 199                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 200                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 201
 202                 if ((new & ~mask) != (tmp & ~mask)) {
 203                         ret = -EINVAL;
 204                         break;
 205                 }
 206         }
 207         mutex_unlock(&local->iflist_mtx);
 208
 209         return ret;
 210 }
 211
 212 static int ieee80211_change_mac(struct net_device *dev, void *addr)
 213 {
 214         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 215         struct sockaddr *sa = addr;
 216         bool check_dup = true;
 217         int ret;
 218
 219         if (ieee80211_sdata_running(sdata))
 220                 return -EBUSY;
 221
 222         if (sdata->vif.type == NL80211_IFTYPE_MONITOR &&
 223             !(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
 224                 check_dup = false;
 225
 226         ret = ieee80211_verify_mac(sdata, sa->sa_data, check_dup);
 227         if (ret)
 228                 return ret;
 229
 230         ret = eth_mac_addr(dev, sa);
 231
 232         if (ret == 0)
 233                 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
 234
 235         return ret;
 236 }
 237
 238 static inline int identical_mac_addr_allowed(int type1, int type2)
 239 {
 240         return type1 == NL80211_IFTYPE_MONITOR ||
 241                 type2 == NL80211_IFTYPE_MONITOR ||
 242                 type1 == NL80211_IFTYPE_P2P_DEVICE ||
 243                 type2 == NL80211_IFTYPE_P2P_DEVICE ||
 244                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
 245                 (type1 == NL80211_IFTYPE_WDS &&
 246                         (type2 == NL80211_IFTYPE_WDS ||
 247                          type2 == NL80211_IFTYPE_AP)) ||
 248                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
 249                 (type1 == NL80211_IFTYPE_AP_VLAN &&
 250                         (type2 == NL80211_IFTYPE_AP ||
 251                          type2 == NL80211_IFTYPE_AP_VLAN));
 252 }
 253
 254 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
 255                                             enum nl80211_iftype iftype)
 256 {
 257         struct ieee80211_local *local = sdata->local;
 258         struct ieee80211_sub_if_data *nsdata;
 259         int ret;
 260
 261         ASSERT_RTNL();
 262
 263         /* we hold the RTNL here so can safely walk the list */
 264         list_for_each_entry(nsdata, &local->interfaces, list) {
 265                 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
 266                         /*
 267                          * Only OCB and monitor mode may coexist
 268                          */
 269                         if ((sdata->vif.type == NL80211_IFTYPE_OCB &&
 270                              nsdata->vif.type != NL80211_IFTYPE_MONITOR) ||
 271                             (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
 272                              nsdata->vif.type == NL80211_IFTYPE_OCB))
 273                                 return -EBUSY;
 274
 275                         /*
 276                          * Allow only a single IBSS interface to be up at any
 277                          * time. This is restricted because beacon distribution
 278                          * cannot work properly if both are in the same IBSS.
 279                          *
 280                          * To remove this restriction we'd have to disallow them
 281                          * from setting the same SSID on different IBSS interfaces
 282                          * belonging to the same hardware. Then, however, we're
 283                          * faced with having to adopt two different TSF timers...
 284                          */
 285                         if (iftype == NL80211_IFTYPE_ADHOC &&
 286                             nsdata->vif.type == NL80211_IFTYPE_ADHOC)
 287                                 return -EBUSY;
 288                         /*
 289                          * will not add another interface while any channel
 290                          * switch is active.
 291                          */
 292                         if (nsdata->vif.csa_active)
 293                                 return -EBUSY;
 294
 295                         /*
 296                          * The remaining checks are only performed for interfaces
 297                          * with the same MAC address.
 298                          */
 299                         if (!ether_addr_equal(sdata->vif.addr,
 300                                               nsdata->vif.addr))
 301                                 continue;
 302
 303                         /*
 304                          * check whether it may have the same address
 305                          */
 306                         if (!identical_mac_addr_allowed(iftype,
 307                                                         nsdata->vif.type))
 308                                 return -ENOTUNIQ;
 309
 310                         /*
 311                          * can only add VLANs to enabled APs
 312                          */
 313                         if (iftype == NL80211_IFTYPE_AP_VLAN &&
 314                             nsdata->vif.type == NL80211_IFTYPE_AP)
 315                                 sdata->bss = &nsdata->u.ap;
 316                 }
 317         }
 318
 319         mutex_lock(&local->chanctx_mtx);
 320         ret = ieee80211_check_combinations(sdata, NULL, 0, 0);
 321         mutex_unlock(&local->chanctx_mtx);
 322         return ret;
 323 }
 324
 325 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata,
 326                                   enum nl80211_iftype iftype)
 327 {
 328         int n_queues = sdata->local->hw.queues;
 329         int i;
 330
 331         if (iftype == NL80211_IFTYPE_NAN)
 332                 return 0;
 333
 334         if (iftype != NL80211_IFTYPE_P2P_DEVICE) {
 335                 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 336                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
 337                                          IEEE80211_INVAL_HW_QUEUE))
 338                                 return -EINVAL;
 339                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
 340                                          n_queues))
 341                                 return -EINVAL;
 342                 }
 343         }
 344
 345         if ((iftype != NL80211_IFTYPE_AP &&
 346              iftype != NL80211_IFTYPE_P2P_GO &&
 347              iftype != NL80211_IFTYPE_MESH_POINT) ||
 348             !ieee80211_hw_check(&sdata->local->hw, QUEUE_CONTROL)) {
 349                 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
 350                 return 0;
 351         }
 352
 353         if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
 354                 return -EINVAL;
 355
 356         if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
 357                 return -EINVAL;
 358
 359         return 0;
 360 }
 361
 362 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
 363                                     const int offset)
 364 {
 365         struct ieee80211_local *local = sdata->local;
 366         u32 flags = sdata->u.mntr.flags;
 367
 368 #define ADJUST(_f, _s)  do {                                    \
 369         if (flags & MONITOR_FLAG_##_f)                          \
 370                 local->fif_##_s += offset;                      \
 371         } while (0)
 372
 373         ADJUST(FCSFAIL, fcsfail);
 374         ADJUST(PLCPFAIL, plcpfail);
 375         ADJUST(CONTROL, control);
 376         ADJUST(CONTROL, pspoll);
 377         ADJUST(OTHER_BSS, other_bss);
 378
 379 #undef ADJUST
 380 }
 381
 382 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
 383 {
 384         struct ieee80211_local *local = sdata->local;
 385         int i;
 386
 387         for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 388                 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
 389                         sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
 390                 else if (local->hw.queues >= IEEE80211_NUM_ACS)
 391                         sdata->vif.hw_queue[i] = i;
 392                 else
 393                         sdata->vif.hw_queue[i] = 0;
 394         }
 395         sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
 396 }
 397
 398 int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
 399 {
 400         struct ieee80211_sub_if_data *sdata;
 401         int ret;
 402
 403         if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
 404                 return 0;
 405
 406         ASSERT_RTNL();
 407
 408         if (local->monitor_sdata)
 409                 return 0;
 410
 411         sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
 412         if (!sdata)
 413                 return -ENOMEM;
 414
 415         /* set up data */
 416         sdata->local = local;
 417         sdata->vif.type = NL80211_IFTYPE_MONITOR;
 418         snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
 419                  wiphy_name(local->hw.wiphy));
 420         sdata->wdev.iftype = NL80211_IFTYPE_MONITOR;
 421
 422         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
 423
 424         ieee80211_set_default_queues(sdata);
 425
 426         ret = drv_add_interface(local, sdata);
 427         if (WARN_ON(ret)) {
 428                 /* ok .. stupid driver, it asked for this! */
 429                 kfree(sdata);
 430                 return ret;
 431         }
 432
 433         ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR);
 434         if (ret) {
 435                 kfree(sdata);
 436                 return ret;
 437         }
 438
 439         mutex_lock(&local->iflist_mtx);
 440         rcu_assign_pointer(local->monitor_sdata, sdata);
 441         mutex_unlock(&local->iflist_mtx);
 442
 443         mutex_lock(&local->mtx);
 444         ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef,
 445                                         IEEE80211_CHANCTX_EXCLUSIVE);
 446         mutex_unlock(&local->mtx);
 447         if (ret) {
 448                 mutex_lock(&local->iflist_mtx);
 449                 RCU_INIT_POINTER(local->monitor_sdata, NULL);
 450                 mutex_unlock(&local->iflist_mtx);
 451                 synchronize_net();
 452                 drv_remove_interface(local, sdata);
 453                 kfree(sdata);
 454                 return ret;
 455         }
 456
 457         skb_queue_head_init(&sdata->skb_queue);
 458         INIT_WORK(&sdata->work, ieee80211_iface_work);
 459
 460         return 0;
 461 }
 462
 463 void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
 464 {
 465         struct ieee80211_sub_if_data *sdata;
 466
 467         if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
 468                 return;
 469
 470         ASSERT_RTNL();
 471
 472         mutex_lock(&local->iflist_mtx);
 473
 474         sdata = rcu_dereference_protected(local->monitor_sdata,
 475                                           lockdep_is_held(&local->iflist_mtx));
 476         if (!sdata) {
 477                 mutex_unlock(&local->iflist_mtx);
 478                 return;
 479         }
 480
 481         RCU_INIT_POINTER(local->monitor_sdata, NULL);
 482         mutex_unlock(&local->iflist_mtx);
 483
 484         synchronize_net();
 485
 486         mutex_lock(&local->mtx);
 487         ieee80211_vif_release_channel(sdata);
 488         mutex_unlock(&local->mtx);
 489
 490         drv_remove_interface(local, sdata);
 491
 492         kfree(sdata);
 493 }
 494
 495 /*
 496  * NOTE: Be very careful when changing this function, it must NOT return
 497  * an error on interface type changes that have been pre-checked, so most
 498  * checks should be in ieee80211_check_concurrent_iface.
 499  */
 500 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
 501 {
 502         struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
 503         struct net_device *dev = wdev->netdev;
 504         struct ieee80211_local *local = sdata->local;
 505         struct sta_info *sta;
 506         u32 changed = 0;
 507         int res;
 508         u32 hw_reconf_flags = 0;
 509
 510         switch (sdata->vif.type) {
 511         case NL80211_IFTYPE_WDS:
 512                 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
 513                         return -ENOLINK;
 514                 break;
 515         case NL80211_IFTYPE_AP_VLAN: {
 516                 struct ieee80211_sub_if_data *master;
 517
 518                 if (!sdata->bss)
 519                         return -ENOLINK;
 520
 521                 mutex_lock(&local->mtx);
 522                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
 523                 mutex_unlock(&local->mtx);
 524
 525                 master = container_of(sdata->bss,
 526                                       struct ieee80211_sub_if_data, u.ap);
 527                 sdata->control_port_protocol =
 528                         master->control_port_protocol;
 529                 sdata->control_port_no_encrypt =
 530                         master->control_port_no_encrypt;
 531                 sdata->vif.cab_queue = master->vif.cab_queue;
 532                 memcpy(sdata->vif.hw_queue, master->vif.hw_queue,
 533                        sizeof(sdata->vif.hw_queue));
 534                 sdata->vif.bss_conf.chandef = master->vif.bss_conf.chandef;
 535
 536                 mutex_lock(&local->key_mtx);
 537                 sdata->crypto_tx_tailroom_needed_cnt +=
 538                         master->crypto_tx_tailroom_needed_cnt;
 539                 mutex_unlock(&local->key_mtx);
 540
 541                 break;
 542                 }
 543         case NL80211_IFTYPE_AP:
 544                 sdata->bss = &sdata->u.ap;
 545                 break;
 546         case NL80211_IFTYPE_MESH_POINT:
 547         case NL80211_IFTYPE_STATION:
 548         case NL80211_IFTYPE_MONITOR:
 549         case NL80211_IFTYPE_ADHOC:
 550         case NL80211_IFTYPE_P2P_DEVICE:
 551         case NL80211_IFTYPE_OCB:
 552         case NL80211_IFTYPE_NAN:
 553                 /* no special treatment */
 554                 break;
 555         case NL80211_IFTYPE_UNSPECIFIED:
 556         case NUM_NL80211_IFTYPES:
 557         case NL80211_IFTYPE_P2P_CLIENT:
 558         case NL80211_IFTYPE_P2P_GO:
 559                 /* cannot happen */
 560                 WARN_ON(1);
 561                 break;
 562         }
 563
 564         if (local->open_count == 0) {
 565                 res = drv_start(local);
 566                 if (res)
 567                         goto err_del_bss;
 568                 /* we're brought up, everything changes */
 569                 hw_reconf_flags = ~0;
 570                 ieee80211_led_radio(local, true);
 571                 ieee80211_mod_tpt_led_trig(local,
 572                                            IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
 573         }
 574
 575         /*
 576          * Copy the hopefully now-present MAC address to
 577          * this interface, if it has the special null one.
 578          */
 579         if (dev && is_zero_ether_addr(dev->dev_addr)) {
 580                 memcpy(dev->dev_addr,
 581                        local->hw.wiphy->perm_addr,
 582                        ETH_ALEN);
 583                 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
 584
 585                 if (!is_valid_ether_addr(dev->dev_addr)) {
 586                         res = -EADDRNOTAVAIL;
 587                         goto err_stop;
 588                 }
 589         }
 590
 591         switch (sdata->vif.type) {
 592         case NL80211_IFTYPE_AP_VLAN:
 593                 /* no need to tell driver, but set carrier and chanctx */
 594                 if (rtnl_dereference(sdata->bss->beacon)) {
 595                         ieee80211_vif_vlan_copy_chanctx(sdata);
 596                         netif_carrier_on(dev);
 597                 } else {
 598                         netif_carrier_off(dev);
 599                 }
 600                 break;
 601         case NL80211_IFTYPE_MONITOR:
 602                 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
 603                         local->cooked_mntrs++;
 604                         break;
 605                 }
 606
 607                 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) {
 608                         res = drv_add_interface(local, sdata);
 609                         if (res)
 610                                 goto err_stop;
 611                 } else if (local->monitors == 0 && local->open_count == 0) {
 612                         res = ieee80211_add_virtual_monitor(local);
 613                         if (res)
 614                                 goto err_stop;
 615                 }
 616
 617                 /* must be before the call to ieee80211_configure_filter */
 618                 local->monitors++;
 619                 if (local->monitors == 1) {
 620                         local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
 621                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 622                 }
 623
 624                 ieee80211_adjust_monitor_flags(sdata, 1);
 625                 ieee80211_configure_filter(local);
 626                 mutex_lock(&local->mtx);
 627                 ieee80211_recalc_idle(local);
 628                 mutex_unlock(&local->mtx);
 629
 630                 netif_carrier_on(dev);
 631                 break;
 632         default:
 633                 if (coming_up) {
 634                         ieee80211_del_virtual_monitor(local);
 635
 636                         res = drv_add_interface(local, sdata);
 637                         if (res)
 638                                 goto err_stop;
 639                         res = ieee80211_check_queues(sdata,
 640                                 ieee80211_vif_type_p2p(&sdata->vif));
 641                         if (res)
 642                                 goto err_del_interface;
 643                 }
 644
 645                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
 646                         local->fif_pspoll++;
 647                         local->fif_probe_req++;
 648
 649                         ieee80211_configure_filter(local);
 650                 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 651                         local->fif_probe_req++;
 652                 }
 653
 654                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE &&
 655                     sdata->vif.type != NL80211_IFTYPE_NAN)
 656                         changed |= ieee80211_reset_erp_info(sdata);
 657                 ieee80211_bss_info_change_notify(sdata, changed);
 658
 659                 switch (sdata->vif.type) {
 660                 case NL80211_IFTYPE_STATION:
 661                 case NL80211_IFTYPE_ADHOC:
 662                 case NL80211_IFTYPE_AP:
 663                 case NL80211_IFTYPE_MESH_POINT:
 664                 case NL80211_IFTYPE_OCB:
 665                         netif_carrier_off(dev);
 666                         break;
 667                 case NL80211_IFTYPE_WDS:
 668                 case NL80211_IFTYPE_P2P_DEVICE:
 669                 case NL80211_IFTYPE_NAN:
 670                         break;
 671                 default:
 672                         /* not reached */
 673                         WARN_ON(1);
 674                 }
 675
 676                 /*
 677                  * Set default queue parameters so drivers don't
 678                  * need to initialise the hardware if the hardware
 679                  * doesn't start up with sane defaults.
 680                  * Enable QoS for anything but station interfaces.
 681                  */
 682                 ieee80211_set_wmm_default(sdata, true,
 683                         sdata->vif.type != NL80211_IFTYPE_STATION);
 684         }
 685
 686         set_bit(SDATA_STATE_RUNNING, &sdata->state);
 687
 688         if (sdata->vif.type == NL80211_IFTYPE_WDS) {
 689                 /* Create STA entry for the WDS peer */
 690                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
 691                                      GFP_KERNEL);
 692                 if (!sta) {
 693                         res = -ENOMEM;
 694                         goto err_del_interface;
 695                 }
 696
 697                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
 698                 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
 699                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
 700
 701                 res = sta_info_insert(sta);
 702                 if (res) {
 703                         /* STA has been freed */
 704                         goto err_del_interface;
 705                 }
 706
 707                 rate_control_rate_init(sta);
 708                 netif_carrier_on(dev);
 709         } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
 710                 rcu_assign_pointer(local->p2p_sdata, sdata);
 711         }
 712
 713         /*
 714          * set_multicast_list will be invoked by the networking core
 715          * which will check whether any increments here were done in
 716          * error and sync them down to the hardware as filter flags.
 717          */
 718         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 719                 atomic_inc(&local->iff_allmultis);
 720
 721         if (coming_up)
 722                 local->open_count++;
 723
 724         if (hw_reconf_flags)
 725                 ieee80211_hw_config(local, hw_reconf_flags);
 726
 727         ieee80211_recalc_ps(local);
 728
 729         if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
 730             sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
 731             local->ops->wake_tx_queue) {
 732                 /* XXX: for AP_VLAN, actually track AP queues */
 733                 netif_tx_start_all_queues(dev);
 734         } else if (dev) {
 735                 unsigned long flags;
 736                 int n_acs = IEEE80211_NUM_ACS;
 737                 int ac;
 738
 739                 if (local->hw.queues < IEEE80211_NUM_ACS)
 740                         n_acs = 1;
 741
 742                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 743                 if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE ||
 744                     (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 &&
 745                      skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) {
 746                         for (ac = 0; ac < n_acs; ac++) {
 747                                 int ac_queue = sdata->vif.hw_queue[ac];
 748
 749                                 if (local->queue_stop_reasons[ac_queue] == 0 &&
 750                                     skb_queue_empty(&local->pending[ac_queue]))
 751                                         netif_start_subqueue(dev, ac);
 752                         }
 753                 }
 754                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 755         }
 756
 757         return 0;
 758  err_del_interface:
 759         drv_remove_interface(local, sdata);
 760  err_stop:
 761         if (!local->open_count)
 762                 drv_stop(local);
 763  err_del_bss:
 764         sdata->bss = NULL;
 765         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 766                 mutex_lock(&local->mtx);
 767                 list_del(&sdata->u.vlan.list);
 768                 mutex_unlock(&local->mtx);
 769         }
 770         /* might already be clear but that doesn't matter */
 771         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 772         return res;
 773 }
 774
 775 static int ieee80211_open(struct net_device *dev)
 776 {
 777         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 778         int err;
 779
 780         /* fail early if user set an invalid address */
 781         if (!is_valid_ether_addr(dev->dev_addr))
 782                 return -EADDRNOTAVAIL;
 783
 784         err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
 785         if (err)
 786                 return err;
 787
 788         return ieee80211_do_open(&sdata->wdev, true);
 789 }
 790
 791 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
 792                               bool going_down)
 793 {
 794         struct ieee80211_sub_if_data *txq_sdata = sdata;
 795         struct ieee80211_local *local = sdata->local;
 796         struct fq *fq = &local->fq;
 797         unsigned long flags;
 798         struct sk_buff *skb, *tmp;
 799         u32 hw_reconf_flags = 0;
 800         int i, flushed;
 801         struct ps_data *ps;
 802         struct cfg80211_chan_def chandef;
 803         bool cancel_scan;
 804         struct cfg80211_nan_func *func;
 805
 806         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 807
 808         cancel_scan = rcu_access_pointer(local->scan_sdata) == sdata;
 809         if (cancel_scan)
 810                 ieee80211_scan_cancel(local);
 811
 812         /*
 813          * Stop TX on this interface first.
 814          */
 815         if (sdata->dev)
 816                 netif_tx_stop_all_queues(sdata->dev);
 817
 818         ieee80211_roc_purge(local, sdata);
 819
 820         switch (sdata->vif.type) {
 821         case NL80211_IFTYPE_STATION:
 822                 ieee80211_mgd_stop(sdata);
 823                 break;
 824         case NL80211_IFTYPE_ADHOC:
 825                 ieee80211_ibss_stop(sdata);
 826                 break;
 827         case NL80211_IFTYPE_AP:
 828                 cancel_work_sync(&sdata->u.ap.request_smps_work);
 829                 break;
 830         default:
 831                 break;
 832         }
 833
 834         /*
 835          * Remove all stations associated with this interface.
 836          *
 837          * This must be done before calling ops->remove_interface()
 838          * because otherwise we can later invoke ops->sta_notify()
 839          * whenever the STAs are removed, and that invalidates driver
 840          * assumptions about always getting a vif pointer that is valid
 841          * (because if we remove a STA after ops->remove_interface()
 842          * the driver will have removed the vif info already!)
 843          *
 844          * In WDS mode a station must exist here and be flushed, for
 845          * AP_VLANs stations may exist since there's nothing else that
 846          * would have removed them, but in other modes there shouldn't
 847          * be any stations.
 848          */
 849         flushed = sta_info_flush(sdata);
 850         WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
 851                      ((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) ||
 852                       (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1)));
 853
 854         /* don't count this interface for allmulti while it is down */
 855         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 856                 atomic_dec(&local->iff_allmultis);
 857
 858         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 859                 local->fif_pspoll--;
 860                 local->fif_probe_req--;
 861         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 862                 local->fif_probe_req--;
 863         }
 864
 865         if (sdata->dev) {
 866                 netif_addr_lock_bh(sdata->dev);
 867                 spin_lock_bh(&local->filter_lock);
 868                 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
 869                                  sdata->dev->addr_len);
 870                 spin_unlock_bh(&local->filter_lock);
 871                 netif_addr_unlock_bh(sdata->dev);
 872         }
 873
 874         del_timer_sync(&local->dynamic_ps_timer);
 875         cancel_work_sync(&local->dynamic_ps_enable_work);
 876
 877         cancel_work_sync(&sdata->recalc_smps);
 878         sdata_lock(sdata);
 879         mutex_lock(&local->mtx);
 880         sdata->vif.csa_active = false;
 881         if (sdata->vif.type == NL80211_IFTYPE_STATION)
 882                 sdata->u.mgd.csa_waiting_bcn = false;
 883         if (sdata->csa_block_tx) {
 884                 ieee80211_wake_vif_queues(local, sdata,
 885                                           IEEE80211_QUEUE_STOP_REASON_CSA);
 886                 sdata->csa_block_tx = false;
 887         }
 888         mutex_unlock(&local->mtx);
 889         sdata_unlock(sdata);
 890
 891         cancel_work_sync(&sdata->csa_finalize_work);
 892
 893         cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
 894
 895         if (sdata->wdev.cac_started) {
 896                 chandef = sdata->vif.bss_conf.chandef;
 897                 WARN_ON(local->suspended);
 898                 mutex_lock(&local->mtx);
 899                 ieee80211_vif_release_channel(sdata);
 900                 mutex_unlock(&local->mtx);
 901                 cfg80211_cac_event(sdata->dev, &chandef,
 902                                    NL80211_RADAR_CAC_ABORTED,
 903                                    GFP_KERNEL);
 904         }
 905
 906         /* APs need special treatment */
 907         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 908                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
 909
 910                 /* down all dependent devices, that is VLANs */
 911                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
 912                                          u.vlan.list)
 913                         dev_close(vlan->dev);
 914                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
 915         } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 916                 /* remove all packets in parent bc_buf pointing to this dev */
 917                 ps = &sdata->bss->ps;
 918
 919                 spin_lock_irqsave(&ps->bc_buf.lock, flags);
 920                 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
 921                         if (skb->dev == sdata->dev) {
 922                                 __skb_unlink(skb, &ps->bc_buf);
 923                                 local->total_ps_buffered--;
 924                                 ieee80211_free_txskb(&local->hw, skb);
 925                         }
 926                 }
 927                 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
 928         }
 929
 930         if (going_down)
 931                 local->open_count--;
 932
 933         switch (sdata->vif.type) {
 934         case NL80211_IFTYPE_AP_VLAN:
 935                 txq_sdata = container_of(sdata->bss,
 936                                          struct ieee80211_sub_if_data, u.ap);
 937
 938                 mutex_lock(&local->mtx);
 939                 list_del(&sdata->u.vlan.list);
 940                 mutex_unlock(&local->mtx);
 941                 RCU_INIT_POINTER(sdata->vif.chanctx_conf, NULL);
 942                 /* see comment in the default case below */
 943                 ieee80211_free_keys(sdata, true);
 944                 /* no need to tell driver */
 945                 break;
 946         case NL80211_IFTYPE_MONITOR:
 947                 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
 948                         local->cooked_mntrs--;
 949                         break;
 950                 }
 951
 952                 local->monitors--;
 953                 if (local->monitors == 0) {
 954                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
 955                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 956                 }
 957
 958                 ieee80211_adjust_monitor_flags(sdata, -1);
 959                 break;
 960         case NL80211_IFTYPE_NAN:
 961                 /* clean all the functions */
 962                 spin_lock_bh(&sdata->u.nan.func_lock);
 963
 964                 idr_for_each_entry(&sdata->u.nan.function_inst_ids, func, i) {
 965                         idr_remove(&sdata->u.nan.function_inst_ids, i);
 966                         cfg80211_free_nan_func(func);
 967                 }
 968                 idr_destroy(&sdata->u.nan.function_inst_ids);
 969
 970                 spin_unlock_bh(&sdata->u.nan.func_lock);
 971                 break;
 972         case NL80211_IFTYPE_P2P_DEVICE:
 973                 /* relies on synchronize_rcu() below */
 974                 RCU_INIT_POINTER(local->p2p_sdata, NULL);
 975                 /* fall through */
 976         default:
 977                 cancel_work_sync(&sdata->work);
 978                 /*
 979                  * When we get here, the interface is marked down.
 980                  * Free the remaining keys, if there are any
 981                  * (which can happen in AP mode if userspace sets
 982                  * keys before the interface is operating, and maybe
 983                  * also in WDS mode)
 984                  *
 985                  * Force the key freeing to always synchronize_net()
 986                  * to wait for the RX path in case it is using this
 987                  * interface enqueuing frames at this very time on
 988                  * another CPU.
 989                  */
 990                 ieee80211_free_keys(sdata, true);
 991                 skb_queue_purge(&sdata->skb_queue);
 992         }
 993
 994         sdata->bss = NULL;
 995
 996         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 997         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 998                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
 999                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1000                         if (info->control.vif == &sdata->vif) {
1001                                 __skb_unlink(skb, &local->pending[i]);
1002                                 ieee80211_free_txskb(&local->hw, skb);
1003                         }
1004                 }
1005         }
1006         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1007
1008         if (txq_sdata->vif.txq) {
1009                 struct txq_info *txqi = to_txq_info(txq_sdata->vif.txq);
1010
1011                 /*
1012                  * FIXME FIXME
1013                  *
1014                  * We really shouldn't purge the *entire* txqi since that
1015                  * contains frames for the other AP_VLANs (and possibly
1016                  * the AP itself) as well, but there's no API in FQ now
1017                  * to be able to filter.
1018                  */
1019
1020                 spin_lock_bh(&fq->lock);
1021                 ieee80211_txq_purge(local, txqi);
1022                 spin_unlock_bh(&fq->lock);
1023         }
1024
1025         if (local->open_count == 0)
1026                 ieee80211_clear_tx_pending(local);
1027
1028         /*
1029          * If the interface goes down while suspended, presumably because
1030          * the device was unplugged and that happens before our resume,
1031          * then the driver is already unconfigured and the remainder of
1032          * this function isn't needed.
1033          * XXX: what about WoWLAN? If the device has software state, e.g.
1034          *      memory allocated, it might expect teardown commands from
1035          *      mac80211 here?
1036          */
1037         if (local->suspended) {
1038                 WARN_ON(local->wowlan);
1039                 WARN_ON(rtnl_dereference(local->monitor_sdata));
1040                 return;
1041         }
1042
1043         switch (sdata->vif.type) {
1044         case NL80211_IFTYPE_AP_VLAN:
1045                 break;
1046         case NL80211_IFTYPE_MONITOR:
1047                 if (local->monitors == 0)
1048                         ieee80211_del_virtual_monitor(local);
1049
1050                 mutex_lock(&local->mtx);
1051                 ieee80211_recalc_idle(local);
1052                 mutex_unlock(&local->mtx);
1053
1054                 if (!(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
1055                         break;
1056
1057                 /* fall through */
1058         default:
1059                 if (going_down)
1060                         drv_remove_interface(local, sdata);
1061         }
1062
1063         ieee80211_recalc_ps(local);
1064
1065         if (cancel_scan)
1066                 flush_delayed_work(&local->scan_work);
1067
1068         if (local->open_count == 0) {
1069                 ieee80211_stop_device(local);
1070
1071                 /* no reconfiguring after stop! */
1072                 return;
1073         }
1074
1075         /* do after stop to avoid reconfiguring when we stop anyway */
1076         ieee80211_configure_filter(local);
1077         ieee80211_hw_config(local, hw_reconf_flags);
1078
1079         if (local->monitors == local->open_count)
1080                 ieee80211_add_virtual_monitor(local);
1081 }
1082
1083 static int ieee80211_stop(struct net_device *dev)
1084 {
1085         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1086
1087         ieee80211_do_stop(sdata, true);
1088
1089         return 0;
1090 }
1091
1092 static void ieee80211_set_multicast_list(struct net_device *dev)
1093 {
1094         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1095         struct ieee80211_local *local = sdata->local;
1096         int allmulti, sdata_allmulti;
1097
1098         allmulti = !!(dev->flags & IFF_ALLMULTI);
1099         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
1100
1101         if (allmulti != sdata_allmulti) {
1102                 if (dev->flags & IFF_ALLMULTI)
1103                         atomic_inc(&local->iff_allmultis);
1104                 else
1105                         atomic_dec(&local->iff_allmultis);
1106                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
1107         }
1108
1109         spin_lock_bh(&local->filter_lock);
1110         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
1111         spin_unlock_bh(&local->filter_lock);
1112         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
1113 }
1114
1115 /*
1116  * Called when the netdev is removed or, by the code below, before
1117  * the interface type changes.
1118  */
1119 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
1120 {
1121         int i;
1122
1123         /* free extra data */
1124         ieee80211_free_keys(sdata, false);
1125
1126         ieee80211_debugfs_remove_netdev(sdata);
1127
1128         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1129                 __skb_queue_purge(&sdata->fragments[i].skb_list);
1130         sdata->fragment_next = 0;
1131
1132         if (ieee80211_vif_is_mesh(&sdata->vif))
1133                 ieee80211_mesh_teardown_sdata(sdata);
1134 }
1135
1136 static void ieee80211_uninit(struct net_device *dev)
1137 {
1138         ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
1139 }
1140
1141 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
1142                                          struct sk_buff *skb,
1143                                          void *accel_priv,
1144                                          select_queue_fallback_t fallback)
1145 {
1146         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
1147 }
1148
1149 static struct rtnl_link_stats64 *
1150 ieee80211_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
1151 {
1152         int i;
1153
1154         for_each_possible_cpu(i) {
1155                 const struct pcpu_sw_netstats *tstats;
1156                 u64 rx_packets, rx_bytes, tx_packets, tx_bytes;
1157                 unsigned int start;
1158
1159                 tstats = per_cpu_ptr(dev->tstats, i);
1160
1161                 do {
1162                         start = u64_stats_fetch_begin_irq(&tstats->syncp);
1163                         rx_packets = tstats->rx_packets;
1164                         tx_packets = tstats->tx_packets;
1165                         rx_bytes = tstats->rx_bytes;
1166                         tx_bytes = tstats->tx_bytes;
1167                 } while (u64_stats_fetch_retry_irq(&tstats->syncp, start));
1168
1169                 stats->rx_packets += rx_packets;
1170                 stats->tx_packets += tx_packets;
1171                 stats->rx_bytes   += rx_bytes;
1172                 stats->tx_bytes   += tx_bytes;
1173         }
1174
1175         return stats;
1176 }
1177
1178 static const struct net_device_ops ieee80211_dataif_ops = {
1179         .ndo_open               = ieee80211_open,
1180         .ndo_stop               = ieee80211_stop,
1181         .ndo_uninit             = ieee80211_uninit,
1182         .ndo_start_xmit         = ieee80211_subif_start_xmit,
1183         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1184         .ndo_change_mtu         = ieee80211_change_mtu,
1185         .ndo_set_mac_address    = ieee80211_change_mac,
1186         .ndo_select_queue       = ieee80211_netdev_select_queue,
1187         .ndo_get_stats64        = ieee80211_get_stats64,
1188 };
1189
1190 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
1191                                           struct sk_buff *skb,
1192                                           void *accel_priv,
1193                                           select_queue_fallback_t fallback)
1194 {
1195         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1196         struct ieee80211_local *local = sdata->local;
1197         struct ieee80211_hdr *hdr;
1198         struct ieee80211_radiotap_header *rtap = (void *)skb->data;
1199
1200         if (local->hw.queues < IEEE80211_NUM_ACS)
1201                 return 0;
1202
1203         if (skb->len < 4 ||
1204             skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
1205                 return 0; /* doesn't matter, frame will be dropped */
1206
1207         hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
1208
1209         return ieee80211_select_queue_80211(sdata, skb, hdr);
1210 }
1211
1212 static const struct net_device_ops ieee80211_monitorif_ops = {
1213         .ndo_open               = ieee80211_open,
1214         .ndo_stop               = ieee80211_stop,
1215         .ndo_uninit             = ieee80211_uninit,
1216         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
1217         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1218         .ndo_change_mtu         = ieee80211_change_mtu,
1219         .ndo_set_mac_address    = ieee80211_change_mac,
1220         .ndo_select_queue       = ieee80211_monitor_select_queue,
1221         .ndo_get_stats64        = ieee80211_get_stats64,
1222 };
1223
1224 static void ieee80211_if_free(struct net_device *dev)
1225 {
1226         free_percpu(dev->tstats);
1227         free_netdev(dev);
1228 }
1229
1230 static void ieee80211_if_setup(struct net_device *dev)
1231 {
1232         ether_setup(dev);
1233         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1234         dev->netdev_ops = &ieee80211_dataif_ops;
1235         dev->destructor = ieee80211_if_free;
1236 }
1237
1238 static void ieee80211_if_setup_no_queue(struct net_device *dev)
1239 {
1240         ieee80211_if_setup(dev);
1241         dev->priv_flags |= IFF_NO_QUEUE;
1242 }
1243
1244 static void ieee80211_iface_work(struct work_struct *work)
1245 {
1246         struct ieee80211_sub_if_data *sdata =
1247                 container_of(work, struct ieee80211_sub_if_data, work);
1248         struct ieee80211_local *local = sdata->local;
1249         struct sk_buff *skb;
1250         struct sta_info *sta;
1251         struct ieee80211_ra_tid *ra_tid;
1252         struct ieee80211_rx_agg *rx_agg;
1253
1254         if (!ieee80211_sdata_running(sdata))
1255                 return;
1256
1257         if (test_bit(SCAN_SW_SCANNING, &local->scanning))
1258                 return;
1259
1260         if (!ieee80211_can_run_worker(local))
1261                 return;
1262
1263         /* first process frames */
1264         while ((skb = skb_dequeue(&sdata->skb_queue))) {
1265                 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1266
1267                 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
1268                         ra_tid = (void *)&skb->cb;
1269                         ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
1270                                                  ra_tid->tid);
1271                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
1272                         ra_tid = (void *)&skb->cb;
1273                         ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
1274                                                 ra_tid->tid);
1275                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_RX_AGG_START) {
1276                         rx_agg = (void *)&skb->cb;
1277                         mutex_lock(&local->sta_mtx);
1278                         sta = sta_info_get_bss(sdata, rx_agg->addr);
1279                         if (sta)
1280                                 __ieee80211_start_rx_ba_session(sta,
1281                                                 0, 0, 0, 1, rx_agg->tid,
1282                                                 IEEE80211_MAX_AMPDU_BUF,
1283                                                 false, true);
1284                         mutex_unlock(&local->sta_mtx);
1285                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_RX_AGG_STOP) {
1286                         rx_agg = (void *)&skb->cb;
1287                         mutex_lock(&local->sta_mtx);
1288                         sta = sta_info_get_bss(sdata, rx_agg->addr);
1289                         if (sta)
1290                                 __ieee80211_stop_rx_ba_session(sta,
1291                                                         rx_agg->tid,
1292                                                         WLAN_BACK_RECIPIENT, 0,
1293                                                         false);
1294                         mutex_unlock(&local->sta_mtx);
1295                 } else if (ieee80211_is_action(mgmt->frame_control) &&
1296                            mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1297                         int len = skb->len;
1298
1299                         mutex_lock(&local->sta_mtx);
1300                         sta = sta_info_get_bss(sdata, mgmt->sa);
1301                         if (sta) {
1302                                 switch (mgmt->u.action.u.addba_req.action_code) {
1303                                 case WLAN_ACTION_ADDBA_REQ:
1304                                         ieee80211_process_addba_request(
1305                                                         local, sta, mgmt, len);
1306                                         break;
1307                                 case WLAN_ACTION_ADDBA_RESP:
1308                                         ieee80211_process_addba_resp(local, sta,
1309                                                                      mgmt, len);
1310                                         break;
1311                                 case WLAN_ACTION_DELBA:
1312                                         ieee80211_process_delba(sdata, sta,
1313                                                                 mgmt, len);
1314                                         break;
1315                                 default:
1316                                         WARN_ON(1);
1317                                         break;
1318                                 }
1319                         }
1320                         mutex_unlock(&local->sta_mtx);
1321                 } else if (ieee80211_is_action(mgmt->frame_control) &&
1322                            mgmt->u.action.category == WLAN_CATEGORY_VHT) {
1323                         switch (mgmt->u.action.u.vht_group_notif.action_code) {
1324                         case WLAN_VHT_ACTION_OPMODE_NOTIF: {
1325                                 struct ieee80211_rx_status *status;
1326                                 enum nl80211_band band;
1327                                 u8 opmode;
1328
1329                                 status = IEEE80211_SKB_RXCB(skb);
1330                                 band = status->band;
1331                                 opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
1332
1333                                 mutex_lock(&local->sta_mtx);
1334                                 sta = sta_info_get_bss(sdata, mgmt->sa);
1335
1336                                 if (sta)
1337                                         ieee80211_vht_handle_opmode(sdata, sta,
1338                                                                     opmode,
1339                                                                     band);
1340
1341                                 mutex_unlock(&local->sta_mtx);
1342                                 break;
1343                         }
1344                         case WLAN_VHT_ACTION_GROUPID_MGMT:
1345                                 ieee80211_process_mu_groups(sdata, mgmt);
1346                                 break;
1347                         default:
1348                                 WARN_ON(1);
1349                                 break;
1350                         }
1351                 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1352                         struct ieee80211_hdr *hdr = (void *)mgmt;
1353                         /*
1354                          * So the frame isn't mgmt, but frame_control
1355                          * is at the right place anyway, of course, so
1356                          * the if statement is correct.
1357                          *
1358                          * Warn if we have other data frame types here,
1359                          * they must not get here.
1360                          */
1361                         WARN_ON(hdr->frame_control &
1362                                         cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1363                         WARN_ON(!(hdr->seq_ctrl &
1364                                         cpu_to_le16(IEEE80211_SCTL_FRAG)));
1365                         /*
1366                          * This was a fragment of a frame, received while
1367                          * a block-ack session was active. That cannot be
1368                          * right, so terminate the session.
1369                          */
1370                         mutex_lock(&local->sta_mtx);
1371                         sta = sta_info_get_bss(sdata, mgmt->sa);
1372                         if (sta) {
1373                                 u16 tid = *ieee80211_get_qos_ctl(hdr) &
1374                                                 IEEE80211_QOS_CTL_TID_MASK;
1375
1376                                 __ieee80211_stop_rx_ba_session(
1377                                         sta, tid, WLAN_BACK_RECIPIENT,
1378                                         WLAN_REASON_QSTA_REQUIRE_SETUP,
1379                                         true);
1380                         }
1381                         mutex_unlock(&local->sta_mtx);
1382                 } else switch (sdata->vif.type) {
1383                 case NL80211_IFTYPE_STATION:
1384                         ieee80211_sta_rx_queued_mgmt(sdata, skb);
1385                         break;
1386                 case NL80211_IFTYPE_ADHOC:
1387                         ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1388                         break;
1389                 case NL80211_IFTYPE_MESH_POINT:
1390                         if (!ieee80211_vif_is_mesh(&sdata->vif))
1391                                 break;
1392                         ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1393                         break;
1394                 default:
1395                         WARN(1, "frame for unexpected interface type");
1396                         break;
1397                 }
1398
1399                 kfree_skb(skb);
1400         }
1401
1402         /* then other type-dependent work */
1403         switch (sdata->vif.type) {
1404         case NL80211_IFTYPE_STATION:
1405                 ieee80211_sta_work(sdata);
1406                 break;
1407         case NL80211_IFTYPE_ADHOC:
1408                 ieee80211_ibss_work(sdata);
1409                 break;
1410         case NL80211_IFTYPE_MESH_POINT:
1411                 if (!ieee80211_vif_is_mesh(&sdata->vif))
1412                         break;
1413                 ieee80211_mesh_work(sdata);
1414                 break;
1415         case NL80211_IFTYPE_OCB:
1416                 ieee80211_ocb_work(sdata);
1417                 break;
1418         default:
1419                 break;
1420         }
1421 }
1422
1423 static void ieee80211_recalc_smps_work(struct work_struct *work)
1424 {
1425         struct ieee80211_sub_if_data *sdata =
1426                 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1427
1428         ieee80211_recalc_smps(sdata);
1429 }
1430
1431 /*
1432  * Helper function to initialise an interface to a specific type.
1433  */
1434 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1435                                   enum nl80211_iftype type)
1436 {
1437         static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff,
1438                                                     0xff, 0xff, 0xff};
1439
1440         /* clear type-dependent union */
1441         memset(&sdata->u, 0, sizeof(sdata->u));
1442
1443         /* and set some type-dependent values */
1444         sdata->vif.type = type;
1445         sdata->vif.p2p = false;
1446         sdata->wdev.iftype = type;
1447
1448         sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1449         sdata->control_port_no_encrypt = false;
1450         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1451         sdata->vif.bss_conf.idle = true;
1452
1453         sdata->noack_map = 0;
1454
1455         /* only monitor/p2p-device differ */
1456         if (sdata->dev) {
1457                 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1458                 sdata->dev->type = ARPHRD_ETHER;
1459         }
1460
1461         skb_queue_head_init(&sdata->skb_queue);
1462         INIT_WORK(&sdata->work, ieee80211_iface_work);
1463         INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1464         INIT_WORK(&sdata->csa_finalize_work, ieee80211_csa_finalize_work);
1465         INIT_LIST_HEAD(&sdata->assigned_chanctx_list);
1466         INIT_LIST_HEAD(&sdata->reserved_chanctx_list);
1467
1468         switch (type) {
1469         case NL80211_IFTYPE_P2P_GO:
1470                 type = NL80211_IFTYPE_AP;
1471                 sdata->vif.type = type;
1472                 sdata->vif.p2p = true;
1473                 /* fall through */
1474         case NL80211_IFTYPE_AP:
1475                 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1476                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1477                 INIT_WORK(&sdata->u.ap.request_smps_work,
1478                           ieee80211_request_smps_ap_work);
1479                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1480                 sdata->u.ap.req_smps = IEEE80211_SMPS_OFF;
1481                 break;
1482         case NL80211_IFTYPE_P2P_CLIENT:
1483                 type = NL80211_IFTYPE_STATION;
1484                 sdata->vif.type = type;
1485                 sdata->vif.p2p = true;
1486                 /* fall through */
1487         case NL80211_IFTYPE_STATION:
1488                 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1489                 ieee80211_sta_setup_sdata(sdata);
1490                 break;
1491         case NL80211_IFTYPE_OCB:
1492                 sdata->vif.bss_conf.bssid = bssid_wildcard;
1493                 ieee80211_ocb_setup_sdata(sdata);
1494                 break;
1495         case NL80211_IFTYPE_ADHOC:
1496                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1497                 ieee80211_ibss_setup_sdata(sdata);
1498                 break;
1499         case NL80211_IFTYPE_MESH_POINT:
1500                 if (ieee80211_vif_is_mesh(&sdata->vif))
1501                         ieee80211_mesh_init_sdata(sdata);
1502                 break;
1503         case NL80211_IFTYPE_MONITOR:
1504                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1505                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1506                 sdata->u.mntr.flags = MONITOR_FLAG_CONTROL |
1507                                       MONITOR_FLAG_OTHER_BSS;
1508                 break;
1509         case NL80211_IFTYPE_WDS:
1510                 sdata->vif.bss_conf.bssid = NULL;
1511                 break;
1512         case NL80211_IFTYPE_NAN:
1513                 idr_init(&sdata->u.nan.function_inst_ids);
1514                 spin_lock_init(&sdata->u.nan.func_lock);
1515                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1516                 break;
1517         case NL80211_IFTYPE_AP_VLAN:
1518         case NL80211_IFTYPE_P2P_DEVICE:
1519                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1520                 break;
1521         case NL80211_IFTYPE_UNSPECIFIED:
1522         case NUM_NL80211_IFTYPES:
1523                 BUG();
1524                 break;
1525         }
1526
1527         ieee80211_debugfs_add_netdev(sdata);
1528 }
1529
1530 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1531                                            enum nl80211_iftype type)
1532 {
1533         struct ieee80211_local *local = sdata->local;
1534         int ret, err;
1535         enum nl80211_iftype internal_type = type;
1536         bool p2p = false;
1537
1538         ASSERT_RTNL();
1539
1540         if (!local->ops->change_interface)
1541                 return -EBUSY;
1542
1543         switch (sdata->vif.type) {
1544         case NL80211_IFTYPE_AP:
1545         case NL80211_IFTYPE_STATION:
1546         case NL80211_IFTYPE_ADHOC:
1547         case NL80211_IFTYPE_OCB:
1548                 /*
1549                  * Could maybe also all others here?
1550                  * Just not sure how that interacts
1551                  * with the RX/config path e.g. for
1552                  * mesh.
1553                  */
1554                 break;
1555         default:
1556                 return -EBUSY;
1557         }
1558
1559         switch (type) {
1560         case NL80211_IFTYPE_AP:
1561         case NL80211_IFTYPE_STATION:
1562         case NL80211_IFTYPE_ADHOC:
1563         case NL80211_IFTYPE_OCB:
1564                 /*
1565                  * Could probably support everything
1566                  * but WDS here (WDS do_open can fail
1567                  * under memory pressure, which this
1568                  * code isn't prepared to handle).
1569                  */
1570                 break;
1571         case NL80211_IFTYPE_P2P_CLIENT:
1572                 p2p = true;
1573                 internal_type = NL80211_IFTYPE_STATION;
1574                 break;
1575         case NL80211_IFTYPE_P2P_GO:
1576                 p2p = true;
1577                 internal_type = NL80211_IFTYPE_AP;
1578                 break;
1579         default:
1580                 return -EBUSY;
1581         }
1582
1583         ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1584         if (ret)
1585                 return ret;
1586
1587         ieee80211_do_stop(sdata, false);
1588
1589         ieee80211_teardown_sdata(sdata);
1590
1591         ret = drv_change_interface(local, sdata, internal_type, p2p);
1592         if (ret)
1593                 type = ieee80211_vif_type_p2p(&sdata->vif);
1594
1595         /*
1596          * Ignore return value here, there's not much we can do since
1597          * the driver changed the interface type internally already.
1598          * The warnings will hopefully make driver authors fix it :-)
1599          */
1600         ieee80211_check_queues(sdata, type);
1601
1602         ieee80211_setup_sdata(sdata, type);
1603
1604         err = ieee80211_do_open(&sdata->wdev, false);
1605         WARN(err, "type change: do_open returned %d", err);
1606
1607         return ret;
1608 }
1609
1610 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1611                              enum nl80211_iftype type)
1612 {
1613         int ret;
1614
1615         ASSERT_RTNL();
1616
1617         if (type == ieee80211_vif_type_p2p(&sdata->vif))
1618                 return 0;
1619
1620         if (ieee80211_sdata_running(sdata)) {
1621                 ret = ieee80211_runtime_change_iftype(sdata, type);
1622                 if (ret)
1623                         return ret;
1624         } else {
1625                 /* Purge and reset type-dependent state. */
1626                 ieee80211_teardown_sdata(sdata);
1627                 ieee80211_setup_sdata(sdata, type);
1628         }
1629
1630         /* reset some values that shouldn't be kept across type changes */
1631         if (type == NL80211_IFTYPE_STATION)
1632                 sdata->u.mgd.use_4addr = false;
1633
1634         return 0;
1635 }
1636
1637 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1638                                        u8 *perm_addr, enum nl80211_iftype type)
1639 {
1640         struct ieee80211_sub_if_data *sdata;
1641         u64 mask, start, addr, val, inc;
1642         u8 *m;
1643         u8 tmp_addr[ETH_ALEN];
1644         int i;
1645
1646         /* default ... something at least */
1647         memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1648
1649         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1650             local->hw.wiphy->n_addresses <= 1)
1651                 return;
1652
1653         mutex_lock(&local->iflist_mtx);
1654
1655         switch (type) {
1656         case NL80211_IFTYPE_MONITOR:
1657                 /* doesn't matter */
1658                 break;
1659         case NL80211_IFTYPE_WDS:
1660         case NL80211_IFTYPE_AP_VLAN:
1661                 /* match up with an AP interface */
1662                 list_for_each_entry(sdata, &local->interfaces, list) {
1663                         if (sdata->vif.type != NL80211_IFTYPE_AP)
1664                                 continue;
1665                         memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1666                         break;
1667                 }
1668                 /* keep default if no AP interface present */
1669                 break;
1670         case NL80211_IFTYPE_P2P_CLIENT:
1671         case NL80211_IFTYPE_P2P_GO:
1672                 if (ieee80211_hw_check(&local->hw, P2P_DEV_ADDR_FOR_INTF)) {
1673                         list_for_each_entry(sdata, &local->interfaces, list) {
1674                                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1675                                         continue;
1676                                 if (!ieee80211_sdata_running(sdata))
1677                                         continue;
1678                                 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1679                                 goto out_unlock;
1680                         }
1681                 }
1682                 /* otherwise fall through */
1683         default:
1684                 /* assign a new address if possible -- try n_addresses first */
1685                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1686                         bool used = false;
1687
1688                         list_for_each_entry(sdata, &local->interfaces, list) {
1689                                 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr,
1690                                                      sdata->vif.addr)) {
1691                                         used = true;
1692                                         break;
1693                                 }
1694                         }
1695
1696                         if (!used) {
1697                                 memcpy(perm_addr,
1698                                        local->hw.wiphy->addresses[i].addr,
1699                                        ETH_ALEN);
1700                                 break;
1701                         }
1702                 }
1703
1704                 /* try mask if available */
1705                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1706                         break;
1707
1708                 m = local->hw.wiphy->addr_mask;
1709                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1710                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1711                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1712
1713                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1714                         /* not a contiguous mask ... not handled now! */
1715                         pr_info("not contiguous\n");
1716                         break;
1717                 }
1718
1719                 /*
1720                  * Pick address of existing interface in case user changed
1721                  * MAC address manually, default to perm_addr.
1722                  */
1723                 m = local->hw.wiphy->perm_addr;
1724                 list_for_each_entry(sdata, &local->interfaces, list) {
1725                         if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
1726                                 continue;
1727                         m = sdata->vif.addr;
1728                         break;
1729                 }
1730                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1731                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1732                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1733
1734                 inc = 1ULL<<__ffs64(mask);
1735                 val = (start & mask);
1736                 addr = (start & ~mask) | (val & mask);
1737                 do {
1738                         bool used = false;
1739
1740                         tmp_addr[5] = addr >> 0*8;
1741                         tmp_addr[4] = addr >> 1*8;
1742                         tmp_addr[3] = addr >> 2*8;
1743                         tmp_addr[2] = addr >> 3*8;
1744                         tmp_addr[1] = addr >> 4*8;
1745                         tmp_addr[0] = addr >> 5*8;
1746
1747                         val += inc;
1748
1749                         list_for_each_entry(sdata, &local->interfaces, list) {
1750                                 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) {
1751                                         used = true;
1752                                         break;
1753                                 }
1754                         }
1755
1756                         if (!used) {
1757                                 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1758                                 break;
1759                         }
1760                         addr = (start & ~mask) | (val & mask);
1761                 } while (addr != start);
1762
1763                 break;
1764         }
1765
1766  out_unlock:
1767         mutex_unlock(&local->iflist_mtx);
1768 }
1769
1770 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1771                      unsigned char name_assign_type,
1772                      struct wireless_dev **new_wdev, enum nl80211_iftype type,
1773                      struct vif_params *params)
1774 {
1775         struct net_device *ndev = NULL;
1776         struct ieee80211_sub_if_data *sdata = NULL;
1777         struct txq_info *txqi;
1778         void (*if_setup)(struct net_device *dev);
1779         int ret, i;
1780         int txqs = 1;
1781
1782         ASSERT_RTNL();
1783
1784         if (type == NL80211_IFTYPE_P2P_DEVICE || type == NL80211_IFTYPE_NAN) {
1785                 struct wireless_dev *wdev;
1786
1787                 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1788                                 GFP_KERNEL);
1789                 if (!sdata)
1790                         return -ENOMEM;
1791                 wdev = &sdata->wdev;
1792
1793                 sdata->dev = NULL;
1794                 strlcpy(sdata->name, name, IFNAMSIZ);
1795                 ieee80211_assign_perm_addr(local, wdev->address, type);
1796                 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1797         } else {
1798                 int size = ALIGN(sizeof(*sdata) + local->hw.vif_data_size,
1799                                  sizeof(void *));
1800                 int txq_size = 0;
1801
1802                 if (local->ops->wake_tx_queue)
1803                         txq_size += sizeof(struct txq_info) +
1804                                     local->hw.txq_data_size;
1805
1806                 if (local->ops->wake_tx_queue)
1807                         if_setup = ieee80211_if_setup_no_queue;
1808                 else
1809                         if_setup = ieee80211_if_setup;
1810
1811                 if (local->hw.queues >= IEEE80211_NUM_ACS)
1812                         txqs = IEEE80211_NUM_ACS;
1813
1814                 ndev = alloc_netdev_mqs(size + txq_size,
1815                                         name, name_assign_type,
1816                                         if_setup, txqs, 1);
1817                 if (!ndev)
1818                         return -ENOMEM;
1819                 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1820
1821                 ndev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1822                 if (!ndev->tstats) {
1823                         free_netdev(ndev);
1824                         return -ENOMEM;
1825                 }
1826
1827                 ndev->needed_headroom = local->tx_headroom +
1828                                         4*6 /* four MAC addresses */
1829                                         + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1830                                         + 6 /* mesh */
1831                                         + 8 /* rfc1042/bridge tunnel */
1832                                         - ETH_HLEN /* ethernet hard_header_len */
1833                                         + IEEE80211_ENCRYPT_HEADROOM;
1834                 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1835
1836                 ret = dev_alloc_name(ndev, ndev->name);
1837                 if (ret < 0) {
1838                         ieee80211_if_free(ndev);
1839                         return ret;
1840                 }
1841
1842                 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1843                 if (params && is_valid_ether_addr(params->macaddr))
1844                         memcpy(ndev->dev_addr, params->macaddr, ETH_ALEN);
1845                 else
1846                         memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1847                 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1848
1849                 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1850                 sdata = netdev_priv(ndev);
1851                 ndev->ieee80211_ptr = &sdata->wdev;
1852                 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1853                 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1854
1855                 if (txq_size) {
1856                         txqi = netdev_priv(ndev) + size;
1857                         ieee80211_txq_init(sdata, NULL, txqi, 0);
1858                 }
1859
1860                 sdata->dev = ndev;
1861         }
1862
1863         /* initialise type-independent data */
1864         sdata->wdev.wiphy = local->hw.wiphy;
1865         sdata->local = local;
1866
1867         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1868                 skb_queue_head_init(&sdata->fragments[i].skb_list);
1869
1870         INIT_LIST_HEAD(&sdata->key_list);
1871
1872         INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
1873                           ieee80211_dfs_cac_timer_work);
1874         INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
1875                           ieee80211_delayed_tailroom_dec);
1876
1877         for (i = 0; i < NUM_NL80211_BANDS; i++) {
1878                 struct ieee80211_supported_band *sband;
1879                 sband = local->hw.wiphy->bands[i];
1880                 sdata->rc_rateidx_mask[i] =
1881                         sband ? (1 << sband->n_bitrates) - 1 : 0;
1882                 if (sband) {
1883                         __le16 cap;
1884                         u16 *vht_rate_mask;
1885
1886                         memcpy(sdata->rc_rateidx_mcs_mask[i],
1887                                sband->ht_cap.mcs.rx_mask,
1888                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1889
1890                         cap = sband->vht_cap.vht_mcs.rx_mcs_map;
1891                         vht_rate_mask = sdata->rc_rateidx_vht_mcs_mask[i];
1892                         ieee80211_get_vht_mask_from_cap(cap, vht_rate_mask);
1893                 } else {
1894                         memset(sdata->rc_rateidx_mcs_mask[i], 0,
1895                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1896                         memset(sdata->rc_rateidx_vht_mcs_mask[i], 0,
1897                                sizeof(sdata->rc_rateidx_vht_mcs_mask[i]));
1898                 }
1899         }
1900
1901         ieee80211_set_default_queues(sdata);
1902
1903         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1904         sdata->user_power_level = local->user_power_level;
1905
1906         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1907
1908         /* setup type-dependent data */
1909         ieee80211_setup_sdata(sdata, type);
1910
1911         if (ndev) {
1912                 if (params) {
1913                         ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1914                         if (type == NL80211_IFTYPE_STATION)
1915                                 sdata->u.mgd.use_4addr = params->use_4addr;
1916                 }
1917
1918                 ndev->features |= local->hw.netdev_features;
1919
1920                 netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops);
1921
1922                 ret = register_netdevice(ndev);
1923                 if (ret) {
1924                         ieee80211_if_free(ndev);
1925                         return ret;
1926                 }
1927         }
1928
1929         mutex_lock(&local->iflist_mtx);
1930         list_add_tail_rcu(&sdata->list, &local->interfaces);
1931         mutex_unlock(&local->iflist_mtx);
1932
1933         if (new_wdev)
1934                 *new_wdev = &sdata->wdev;
1935
1936         return 0;
1937 }
1938
1939 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1940 {
1941         ASSERT_RTNL();
1942
1943         mutex_lock(&sdata->local->iflist_mtx);
1944         list_del_rcu(&sdata->list);
1945         mutex_unlock(&sdata->local->iflist_mtx);
1946
1947         synchronize_rcu();
1948
1949         if (sdata->dev) {
1950                 unregister_netdevice(sdata->dev);
1951         } else {
1952                 cfg80211_unregister_wdev(&sdata->wdev);
1953                 ieee80211_teardown_sdata(sdata);
1954                 kfree(sdata);
1955         }
1956 }
1957
1958 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
1959 {
1960         if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
1961                 return;
1962         ieee80211_do_stop(sdata, true);
1963 }
1964
1965 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1966 {
1967         struct ieee80211_sub_if_data *sdata, *tmp;
1968         LIST_HEAD(unreg_list);
1969         LIST_HEAD(wdev_list);
1970
1971         ASSERT_RTNL();
1972
1973         /* Before destroying the interfaces, make sure they're all stopped so
1974          * that the hardware is stopped. Otherwise, the driver might still be
1975          * iterating the interfaces during the shutdown, e.g. from a worker
1976          * or from RX processing or similar, and if it does so (using atomic
1977          * iteration) while we're manipulating the list, the iteration will
1978          * crash.
1979          *
1980          * After this, the hardware should be stopped and the driver should
1981          * have stopped all of its activities, so that we can do RCU-unaware
1982          * manipulations of the interface list below.
1983          */
1984         cfg80211_shutdown_all_interfaces(local->hw.wiphy);
1985
1986         WARN(local->open_count, "%s: open count remains %d\n",
1987              wiphy_name(local->hw.wiphy), local->open_count);
1988
1989         mutex_lock(&local->iflist_mtx);
1990         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1991                 list_del(&sdata->list);
1992
1993                 if (sdata->dev)
1994                         unregister_netdevice_queue(sdata->dev, &unreg_list);
1995                 else
1996                         list_add(&sdata->list, &wdev_list);
1997         }
1998         mutex_unlock(&local->iflist_mtx);
1999         unregister_netdevice_many(&unreg_list);
2000
2001         list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
2002                 list_del(&sdata->list);
2003                 cfg80211_unregister_wdev(&sdata->wdev);
2004                 kfree(sdata);
2005         }
2006 }
2007
2008 static int netdev_notify(struct notifier_block *nb,
2009                          unsigned long state, void *ptr)
2010 {
2011         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2012         struct ieee80211_sub_if_data *sdata;
2013
2014         if (state != NETDEV_CHANGENAME)
2015                 return NOTIFY_DONE;
2016
2017         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
2018                 return NOTIFY_DONE;
2019
2020         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
2021                 return NOTIFY_DONE;
2022
2023         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2024         memcpy(sdata->name, dev->name, IFNAMSIZ);
2025         ieee80211_debugfs_rename_netdev(sdata);
2026
2027         return NOTIFY_OK;
2028 }
2029
2030 static struct notifier_block mac80211_netdev_notifier = {
2031         .notifier_call = netdev_notify,
2032 };
2033
2034 int ieee80211_iface_init(void)
2035 {
2036         return register_netdevice_notifier(&mac80211_netdev_notifier);
2037 }
2038
2039 void ieee80211_iface_exit(void)
2040 {
2041         unregister_netdevice_notifier(&mac80211_netdev_notifier);
2042 }