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                 netif_tx_start_all_queues(dev);
 735         } else if (dev) {
 736                 unsigned long flags;
 737                 int n_acs = IEEE80211_NUM_ACS;
 738                 int ac;
 739
 740                 if (local->hw.queues < IEEE80211_NUM_ACS)
 741                         n_acs = 1;
 742
 743                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 744                 if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE ||
 745                     (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 &&
 746                      skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) {
 747                         for (ac = 0; ac < n_acs; ac++) {
 748                                 int ac_queue = sdata->vif.hw_queue[ac];
 749
 750                                 if (local->queue_stop_reasons[ac_queue] == 0 &&
 751                                     skb_queue_empty(&local->pending[ac_queue]))
 752                                         netif_start_subqueue(dev, ac);
 753                         }
 754                 }
 755                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 756         }
 757
 758         return 0;
 759  err_del_interface:
 760         drv_remove_interface(local, sdata);
 761  err_stop:
 762         if (!local->open_count)
 763                 drv_stop(local);
 764  err_del_bss:
 765         sdata->bss = NULL;
 766         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 767                 mutex_lock(&local->mtx);
 768                 list_del(&sdata->u.vlan.list);
 769                 mutex_unlock(&local->mtx);
 770         }
 771         /* might already be clear but that doesn't matter */
 772         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 773         return res;
 774 }
 775
 776 static int ieee80211_open(struct net_device *dev)
 777 {
 778         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 779         int err;
 780
 781         /* fail early if user set an invalid address */
 782         if (!is_valid_ether_addr(dev->dev_addr))
 783                 return -EADDRNOTAVAIL;
 784
 785         err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
 786         if (err)
 787                 return err;
 788
 789         return ieee80211_do_open(&sdata->wdev, true);
 790 }
 791
 792 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
 793                               bool going_down)
 794 {
 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         case NL80211_IFTYPE_MONITOR:
 831                 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES)
 832                         break;
 833                 list_del_rcu(&sdata->u.mntr.list);
 834                 break;
 835         default:
 836                 break;
 837         }
 838
 839         /*
 840          * Remove all stations associated with this interface.
 841          *
 842          * This must be done before calling ops->remove_interface()
 843          * because otherwise we can later invoke ops->sta_notify()
 844          * whenever the STAs are removed, and that invalidates driver
 845          * assumptions about always getting a vif pointer that is valid
 846          * (because if we remove a STA after ops->remove_interface()
 847          * the driver will have removed the vif info already!)
 848          *
 849          * In WDS mode a station must exist here and be flushed, for
 850          * AP_VLANs stations may exist since there's nothing else that
 851          * would have removed them, but in other modes there shouldn't
 852          * be any stations.
 853          */
 854         flushed = sta_info_flush(sdata);
 855         WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
 856                      ((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) ||
 857                       (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1)));
 858
 859         /* don't count this interface for allmulti while it is down */
 860         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 861                 atomic_dec(&local->iff_allmultis);
 862
 863         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 864                 local->fif_pspoll--;
 865                 local->fif_probe_req--;
 866         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 867                 local->fif_probe_req--;
 868         }
 869
 870         if (sdata->dev) {
 871                 netif_addr_lock_bh(sdata->dev);
 872                 spin_lock_bh(&local->filter_lock);
 873                 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
 874                                  sdata->dev->addr_len);
 875                 spin_unlock_bh(&local->filter_lock);
 876                 netif_addr_unlock_bh(sdata->dev);
 877         }
 878
 879         del_timer_sync(&local->dynamic_ps_timer);
 880         cancel_work_sync(&local->dynamic_ps_enable_work);
 881
 882         cancel_work_sync(&sdata->recalc_smps);
 883         sdata_lock(sdata);
 884         mutex_lock(&local->mtx);
 885         sdata->vif.csa_active = false;
 886         if (sdata->vif.type == NL80211_IFTYPE_STATION)
 887                 sdata->u.mgd.csa_waiting_bcn = false;
 888         if (sdata->csa_block_tx) {
 889                 ieee80211_wake_vif_queues(local, sdata,
 890                                           IEEE80211_QUEUE_STOP_REASON_CSA);
 891                 sdata->csa_block_tx = false;
 892         }
 893         mutex_unlock(&local->mtx);
 894         sdata_unlock(sdata);
 895
 896         cancel_work_sync(&sdata->csa_finalize_work);
 897
 898         cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
 899
 900         if (sdata->wdev.cac_started) {
 901                 chandef = sdata->vif.bss_conf.chandef;
 902                 WARN_ON(local->suspended);
 903                 mutex_lock(&local->mtx);
 904                 ieee80211_vif_release_channel(sdata);
 905                 mutex_unlock(&local->mtx);
 906                 cfg80211_cac_event(sdata->dev, &chandef,
 907                                    NL80211_RADAR_CAC_ABORTED,
 908                                    GFP_KERNEL);
 909         }
 910
 911         /* APs need special treatment */
 912         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 913                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
 914
 915                 /* down all dependent devices, that is VLANs */
 916                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
 917                                          u.vlan.list)
 918                         dev_close(vlan->dev);
 919                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
 920         } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 921                 /* remove all packets in parent bc_buf pointing to this dev */
 922                 ps = &sdata->bss->ps;
 923
 924                 spin_lock_irqsave(&ps->bc_buf.lock, flags);
 925                 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
 926                         if (skb->dev == sdata->dev) {
 927                                 __skb_unlink(skb, &ps->bc_buf);
 928                                 local->total_ps_buffered--;
 929                                 ieee80211_free_txskb(&local->hw, skb);
 930                         }
 931                 }
 932                 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
 933         }
 934
 935         if (going_down)
 936                 local->open_count--;
 937
 938         switch (sdata->vif.type) {
 939         case NL80211_IFTYPE_AP_VLAN:
 940                 mutex_lock(&local->mtx);
 941                 list_del(&sdata->u.vlan.list);
 942                 mutex_unlock(&local->mtx);
 943                 RCU_INIT_POINTER(sdata->vif.chanctx_conf, NULL);
 944                 /* see comment in the default case below */
 945                 ieee80211_free_keys(sdata, true);
 946                 /* no need to tell driver */
 947                 break;
 948         case NL80211_IFTYPE_MONITOR:
 949                 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
 950                         local->cooked_mntrs--;
 951                         break;
 952                 }
 953
 954                 local->monitors--;
 955                 if (local->monitors == 0) {
 956                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
 957                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 958                 }
 959
 960                 ieee80211_adjust_monitor_flags(sdata, -1);
 961                 break;
 962         case NL80211_IFTYPE_NAN:
 963                 /* clean all the functions */
 964                 spin_lock_bh(&sdata->u.nan.func_lock);
 965
 966                 idr_for_each_entry(&sdata->u.nan.function_inst_ids, func, i) {
 967                         idr_remove(&sdata->u.nan.function_inst_ids, i);
 968                         cfg80211_free_nan_func(func);
 969                 }
 970                 idr_destroy(&sdata->u.nan.function_inst_ids);
 971
 972                 spin_unlock_bh(&sdata->u.nan.func_lock);
 973                 break;
 974         case NL80211_IFTYPE_P2P_DEVICE:
 975                 /* relies on synchronize_rcu() below */
 976                 RCU_INIT_POINTER(local->p2p_sdata, NULL);
 977                 /* fall through */
 978         default:
 979                 cancel_work_sync(&sdata->work);
 980                 /*
 981                  * When we get here, the interface is marked down.
 982                  * Free the remaining keys, if there are any
 983                  * (which can happen in AP mode if userspace sets
 984                  * keys before the interface is operating, and maybe
 985                  * also in WDS mode)
 986                  *
 987                  * Force the key freeing to always synchronize_net()
 988                  * to wait for the RX path in case it is using this
 989                  * interface enqueuing frames at this very time on
 990                  * another CPU.
 991                  */
 992                 ieee80211_free_keys(sdata, true);
 993                 skb_queue_purge(&sdata->skb_queue);
 994         }
 995
 996         sdata->bss = NULL;
 997
 998         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 999         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
1000                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
1001                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1002                         if (info->control.vif == &sdata->vif) {
1003                                 __skb_unlink(skb, &local->pending[i]);
1004                                 ieee80211_free_txskb(&local->hw, skb);
1005                         }
1006                 }
1007         }
1008         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1009
1010         if (sdata->vif.txq) {
1011                 struct txq_info *txqi = to_txq_info(sdata->vif.txq);
1012
1013                 spin_lock_bh(&fq->lock);
1014                 ieee80211_txq_purge(local, txqi);
1015                 spin_unlock_bh(&fq->lock);
1016         }
1017
1018         if (local->open_count == 0)
1019                 ieee80211_clear_tx_pending(local);
1020
1021         /*
1022          * If the interface goes down while suspended, presumably because
1023          * the device was unplugged and that happens before our resume,
1024          * then the driver is already unconfigured and the remainder of
1025          * this function isn't needed.
1026          * XXX: what about WoWLAN? If the device has software state, e.g.
1027          *      memory allocated, it might expect teardown commands from
1028          *      mac80211 here?
1029          */
1030         if (local->suspended) {
1031                 WARN_ON(local->wowlan);
1032                 WARN_ON(rtnl_dereference(local->monitor_sdata));
1033                 return;
1034         }
1035
1036         switch (sdata->vif.type) {
1037         case NL80211_IFTYPE_AP_VLAN:
1038                 break;
1039         case NL80211_IFTYPE_MONITOR:
1040                 if (local->monitors == 0)
1041                         ieee80211_del_virtual_monitor(local);
1042
1043                 mutex_lock(&local->mtx);
1044                 ieee80211_recalc_idle(local);
1045                 mutex_unlock(&local->mtx);
1046
1047                 if (!(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
1048                         break;
1049
1050                 /* fall through */
1051         default:
1052                 if (going_down)
1053                         drv_remove_interface(local, sdata);
1054         }
1055
1056         ieee80211_recalc_ps(local);
1057
1058         if (cancel_scan)
1059                 flush_delayed_work(&local->scan_work);
1060
1061         if (local->open_count == 0) {
1062                 ieee80211_stop_device(local);
1063
1064                 /* no reconfiguring after stop! */
1065                 return;
1066         }
1067
1068         /* do after stop to avoid reconfiguring when we stop anyway */
1069         ieee80211_configure_filter(local);
1070         ieee80211_hw_config(local, hw_reconf_flags);
1071
1072         if (local->monitors == local->open_count)
1073                 ieee80211_add_virtual_monitor(local);
1074 }
1075
1076 static int ieee80211_stop(struct net_device *dev)
1077 {
1078         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1079
1080         ieee80211_do_stop(sdata, true);
1081
1082         return 0;
1083 }
1084
1085 static void ieee80211_set_multicast_list(struct net_device *dev)
1086 {
1087         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1088         struct ieee80211_local *local = sdata->local;
1089         int allmulti, sdata_allmulti;
1090
1091         allmulti = !!(dev->flags & IFF_ALLMULTI);
1092         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
1093
1094         if (allmulti != sdata_allmulti) {
1095                 if (dev->flags & IFF_ALLMULTI)
1096                         atomic_inc(&local->iff_allmultis);
1097                 else
1098                         atomic_dec(&local->iff_allmultis);
1099                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
1100         }
1101
1102         spin_lock_bh(&local->filter_lock);
1103         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
1104         spin_unlock_bh(&local->filter_lock);
1105         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
1106 }
1107
1108 /*
1109  * Called when the netdev is removed or, by the code below, before
1110  * the interface type changes.
1111  */
1112 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
1113 {
1114         int i;
1115
1116         /* free extra data */
1117         ieee80211_free_keys(sdata, false);
1118
1119         ieee80211_debugfs_remove_netdev(sdata);
1120
1121         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1122                 __skb_queue_purge(&sdata->fragments[i].skb_list);
1123         sdata->fragment_next = 0;
1124
1125         if (ieee80211_vif_is_mesh(&sdata->vif))
1126                 ieee80211_mesh_teardown_sdata(sdata);
1127 }
1128
1129 static void ieee80211_uninit(struct net_device *dev)
1130 {
1131         ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
1132 }
1133
1134 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
1135                                          struct sk_buff *skb,
1136                                          void *accel_priv,
1137                                          select_queue_fallback_t fallback)
1138 {
1139         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
1140 }
1141
1142 static void
1143 ieee80211_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
1144 {
1145         int i;
1146
1147         for_each_possible_cpu(i) {
1148                 const struct pcpu_sw_netstats *tstats;
1149                 u64 rx_packets, rx_bytes, tx_packets, tx_bytes;
1150                 unsigned int start;
1151
1152                 tstats = per_cpu_ptr(dev->tstats, i);
1153
1154                 do {
1155                         start = u64_stats_fetch_begin_irq(&tstats->syncp);
1156                         rx_packets = tstats->rx_packets;
1157                         tx_packets = tstats->tx_packets;
1158                         rx_bytes = tstats->rx_bytes;
1159                         tx_bytes = tstats->tx_bytes;
1160                 } while (u64_stats_fetch_retry_irq(&tstats->syncp, start));
1161
1162                 stats->rx_packets += rx_packets;
1163                 stats->tx_packets += tx_packets;
1164                 stats->rx_bytes   += rx_bytes;
1165                 stats->tx_bytes   += tx_bytes;
1166         }
1167 }
1168
1169 static const struct net_device_ops ieee80211_dataif_ops = {
1170         .ndo_open               = ieee80211_open,
1171         .ndo_stop               = ieee80211_stop,
1172         .ndo_uninit             = ieee80211_uninit,
1173         .ndo_start_xmit         = ieee80211_subif_start_xmit,
1174         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1175         .ndo_set_mac_address    = ieee80211_change_mac,
1176         .ndo_select_queue       = ieee80211_netdev_select_queue,
1177         .ndo_get_stats64        = ieee80211_get_stats64,
1178 };
1179
1180 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
1181                                           struct sk_buff *skb,
1182                                           void *accel_priv,
1183                                           select_queue_fallback_t fallback)
1184 {
1185         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1186         struct ieee80211_local *local = sdata->local;
1187         struct ieee80211_hdr *hdr;
1188         struct ieee80211_radiotap_header *rtap = (void *)skb->data;
1189
1190         if (local->hw.queues < IEEE80211_NUM_ACS)
1191                 return 0;
1192
1193         if (skb->len < 4 ||
1194             skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
1195                 return 0; /* doesn't matter, frame will be dropped */
1196
1197         hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
1198
1199         return ieee80211_select_queue_80211(sdata, skb, hdr);
1200 }
1201
1202 static const struct net_device_ops ieee80211_monitorif_ops = {
1203         .ndo_open               = ieee80211_open,
1204         .ndo_stop               = ieee80211_stop,
1205         .ndo_uninit             = ieee80211_uninit,
1206         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
1207         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1208         .ndo_set_mac_address    = ieee80211_change_mac,
1209         .ndo_select_queue       = ieee80211_monitor_select_queue,
1210         .ndo_get_stats64        = ieee80211_get_stats64,
1211 };
1212
1213 static void ieee80211_if_free(struct net_device *dev)
1214 {
1215         free_percpu(dev->tstats);
1216         free_netdev(dev);
1217 }
1218
1219 static void ieee80211_if_setup(struct net_device *dev)
1220 {
1221         ether_setup(dev);
1222         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1223         dev->netdev_ops = &ieee80211_dataif_ops;
1224         dev->destructor = ieee80211_if_free;
1225 }
1226
1227 static void ieee80211_if_setup_no_queue(struct net_device *dev)
1228 {
1229         ieee80211_if_setup(dev);
1230         dev->priv_flags |= IFF_NO_QUEUE;
1231 }
1232
1233 static void ieee80211_iface_work(struct work_struct *work)
1234 {
1235         struct ieee80211_sub_if_data *sdata =
1236                 container_of(work, struct ieee80211_sub_if_data, work);
1237         struct ieee80211_local *local = sdata->local;
1238         struct sk_buff *skb;
1239         struct sta_info *sta;
1240         struct ieee80211_ra_tid *ra_tid;
1241         struct ieee80211_rx_agg *rx_agg;
1242
1243         if (!ieee80211_sdata_running(sdata))
1244                 return;
1245
1246         if (test_bit(SCAN_SW_SCANNING, &local->scanning))
1247                 return;
1248
1249         if (!ieee80211_can_run_worker(local))
1250                 return;
1251
1252         /* first process frames */
1253         while ((skb = skb_dequeue(&sdata->skb_queue))) {
1254                 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1255
1256                 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
1257                         ra_tid = (void *)&skb->cb;
1258                         ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
1259                                                  ra_tid->tid);
1260                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
1261                         ra_tid = (void *)&skb->cb;
1262                         ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
1263                                                 ra_tid->tid);
1264                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_RX_AGG_START) {
1265                         rx_agg = (void *)&skb->cb;
1266                         mutex_lock(&local->sta_mtx);
1267                         sta = sta_info_get_bss(sdata, rx_agg->addr);
1268                         if (sta)
1269                                 __ieee80211_start_rx_ba_session(sta,
1270                                                 0, 0, 0, 1, rx_agg->tid,
1271                                                 IEEE80211_MAX_AMPDU_BUF,
1272                                                 false, true);
1273                         mutex_unlock(&local->sta_mtx);
1274                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_RX_AGG_STOP) {
1275                         rx_agg = (void *)&skb->cb;
1276                         mutex_lock(&local->sta_mtx);
1277                         sta = sta_info_get_bss(sdata, rx_agg->addr);
1278                         if (sta)
1279                                 __ieee80211_stop_rx_ba_session(sta,
1280                                                         rx_agg->tid,
1281                                                         WLAN_BACK_RECIPIENT, 0,
1282                                                         false);
1283                         mutex_unlock(&local->sta_mtx);
1284                 } else if (ieee80211_is_action(mgmt->frame_control) &&
1285                            mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1286                         int len = skb->len;
1287
1288                         mutex_lock(&local->sta_mtx);
1289                         sta = sta_info_get_bss(sdata, mgmt->sa);
1290                         if (sta) {
1291                                 switch (mgmt->u.action.u.addba_req.action_code) {
1292                                 case WLAN_ACTION_ADDBA_REQ:
1293                                         ieee80211_process_addba_request(
1294                                                         local, sta, mgmt, len);
1295                                         break;
1296                                 case WLAN_ACTION_ADDBA_RESP:
1297                                         ieee80211_process_addba_resp(local, sta,
1298                                                                      mgmt, len);
1299                                         break;
1300                                 case WLAN_ACTION_DELBA:
1301                                         ieee80211_process_delba(sdata, sta,
1302                                                                 mgmt, len);
1303                                         break;
1304                                 default:
1305                                         WARN_ON(1);
1306                                         break;
1307                                 }
1308                         }
1309                         mutex_unlock(&local->sta_mtx);
1310                 } else if (ieee80211_is_action(mgmt->frame_control) &&
1311                            mgmt->u.action.category == WLAN_CATEGORY_VHT) {
1312                         switch (mgmt->u.action.u.vht_group_notif.action_code) {
1313                         case WLAN_VHT_ACTION_OPMODE_NOTIF: {
1314                                 struct ieee80211_rx_status *status;
1315                                 enum nl80211_band band;
1316                                 u8 opmode;
1317
1318                                 status = IEEE80211_SKB_RXCB(skb);
1319                                 band = status->band;
1320                                 opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
1321
1322                                 mutex_lock(&local->sta_mtx);
1323                                 sta = sta_info_get_bss(sdata, mgmt->sa);
1324
1325                                 if (sta)
1326                                         ieee80211_vht_handle_opmode(sdata, sta,
1327                                                                     opmode,
1328                                                                     band);
1329
1330                                 mutex_unlock(&local->sta_mtx);
1331                                 break;
1332                         }
1333                         case WLAN_VHT_ACTION_GROUPID_MGMT:
1334                                 ieee80211_process_mu_groups(sdata, mgmt);
1335                                 break;
1336                         default:
1337                                 WARN_ON(1);
1338                                 break;
1339                         }
1340                 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1341                         struct ieee80211_hdr *hdr = (void *)mgmt;
1342                         /*
1343                          * So the frame isn't mgmt, but frame_control
1344                          * is at the right place anyway, of course, so
1345                          * the if statement is correct.
1346                          *
1347                          * Warn if we have other data frame types here,
1348                          * they must not get here.
1349                          */
1350                         WARN_ON(hdr->frame_control &
1351                                         cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1352                         WARN_ON(!(hdr->seq_ctrl &
1353                                         cpu_to_le16(IEEE80211_SCTL_FRAG)));
1354                         /*
1355                          * This was a fragment of a frame, received while
1356                          * a block-ack session was active. That cannot be
1357                          * right, so terminate the session.
1358                          */
1359                         mutex_lock(&local->sta_mtx);
1360                         sta = sta_info_get_bss(sdata, mgmt->sa);
1361                         if (sta) {
1362                                 u16 tid = *ieee80211_get_qos_ctl(hdr) &
1363                                                 IEEE80211_QOS_CTL_TID_MASK;
1364
1365                                 __ieee80211_stop_rx_ba_session(
1366                                         sta, tid, WLAN_BACK_RECIPIENT,
1367                                         WLAN_REASON_QSTA_REQUIRE_SETUP,
1368                                         true);
1369                         }
1370                         mutex_unlock(&local->sta_mtx);
1371                 } else switch (sdata->vif.type) {
1372                 case NL80211_IFTYPE_STATION:
1373                         ieee80211_sta_rx_queued_mgmt(sdata, skb);
1374                         break;
1375                 case NL80211_IFTYPE_ADHOC:
1376                         ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1377                         break;
1378                 case NL80211_IFTYPE_MESH_POINT:
1379                         if (!ieee80211_vif_is_mesh(&sdata->vif))
1380                                 break;
1381                         ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1382                         break;
1383                 default:
1384                         WARN(1, "frame for unexpected interface type");
1385                         break;
1386                 }
1387
1388                 kfree_skb(skb);
1389         }
1390
1391         /* then other type-dependent work */
1392         switch (sdata->vif.type) {
1393         case NL80211_IFTYPE_STATION:
1394                 ieee80211_sta_work(sdata);
1395                 break;
1396         case NL80211_IFTYPE_ADHOC:
1397                 ieee80211_ibss_work(sdata);
1398                 break;
1399         case NL80211_IFTYPE_MESH_POINT:
1400                 if (!ieee80211_vif_is_mesh(&sdata->vif))
1401                         break;
1402                 ieee80211_mesh_work(sdata);
1403                 break;
1404         case NL80211_IFTYPE_OCB:
1405                 ieee80211_ocb_work(sdata);
1406                 break;
1407         default:
1408                 break;
1409         }
1410 }
1411
1412 static void ieee80211_recalc_smps_work(struct work_struct *work)
1413 {
1414         struct ieee80211_sub_if_data *sdata =
1415                 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1416
1417         ieee80211_recalc_smps(sdata);
1418 }
1419
1420 /*
1421  * Helper function to initialise an interface to a specific type.
1422  */
1423 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1424                                   enum nl80211_iftype type)
1425 {
1426         static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff,
1427                                                     0xff, 0xff, 0xff};
1428
1429         /* clear type-dependent union */
1430         memset(&sdata->u, 0, sizeof(sdata->u));
1431
1432         /* and set some type-dependent values */
1433         sdata->vif.type = type;
1434         sdata->vif.p2p = false;
1435         sdata->wdev.iftype = type;
1436
1437         sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1438         sdata->control_port_no_encrypt = false;
1439         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1440         sdata->vif.bss_conf.idle = true;
1441
1442         sdata->noack_map = 0;
1443
1444         /* only monitor/p2p-device differ */
1445         if (sdata->dev) {
1446                 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1447                 sdata->dev->type = ARPHRD_ETHER;
1448         }
1449
1450         skb_queue_head_init(&sdata->skb_queue);
1451         INIT_WORK(&sdata->work, ieee80211_iface_work);
1452         INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1453         INIT_WORK(&sdata->csa_finalize_work, ieee80211_csa_finalize_work);
1454         INIT_LIST_HEAD(&sdata->assigned_chanctx_list);
1455         INIT_LIST_HEAD(&sdata->reserved_chanctx_list);
1456
1457         switch (type) {
1458         case NL80211_IFTYPE_P2P_GO:
1459                 type = NL80211_IFTYPE_AP;
1460                 sdata->vif.type = type;
1461                 sdata->vif.p2p = true;
1462                 /* fall through */
1463         case NL80211_IFTYPE_AP:
1464                 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1465                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1466                 INIT_WORK(&sdata->u.ap.request_smps_work,
1467                           ieee80211_request_smps_ap_work);
1468                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1469                 sdata->u.ap.req_smps = IEEE80211_SMPS_OFF;
1470                 break;
1471         case NL80211_IFTYPE_P2P_CLIENT:
1472                 type = NL80211_IFTYPE_STATION;
1473                 sdata->vif.type = type;
1474                 sdata->vif.p2p = true;
1475                 /* fall through */
1476         case NL80211_IFTYPE_STATION:
1477                 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1478                 ieee80211_sta_setup_sdata(sdata);
1479                 break;
1480         case NL80211_IFTYPE_OCB:
1481                 sdata->vif.bss_conf.bssid = bssid_wildcard;
1482                 ieee80211_ocb_setup_sdata(sdata);
1483                 break;
1484         case NL80211_IFTYPE_ADHOC:
1485                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1486                 ieee80211_ibss_setup_sdata(sdata);
1487                 break;
1488         case NL80211_IFTYPE_MESH_POINT:
1489                 if (ieee80211_vif_is_mesh(&sdata->vif))
1490                         ieee80211_mesh_init_sdata(sdata);
1491                 break;
1492         case NL80211_IFTYPE_MONITOR:
1493                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1494                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1495                 sdata->u.mntr.flags = MONITOR_FLAG_CONTROL |
1496                                       MONITOR_FLAG_OTHER_BSS;
1497                 break;
1498         case NL80211_IFTYPE_WDS:
1499                 sdata->vif.bss_conf.bssid = NULL;
1500                 break;
1501         case NL80211_IFTYPE_NAN:
1502                 idr_init(&sdata->u.nan.function_inst_ids);
1503                 spin_lock_init(&sdata->u.nan.func_lock);
1504                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1505                 break;
1506         case NL80211_IFTYPE_AP_VLAN:
1507         case NL80211_IFTYPE_P2P_DEVICE:
1508                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1509                 break;
1510         case NL80211_IFTYPE_UNSPECIFIED:
1511         case NUM_NL80211_IFTYPES:
1512                 BUG();
1513                 break;
1514         }
1515
1516         ieee80211_debugfs_add_netdev(sdata);
1517 }
1518
1519 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1520                                            enum nl80211_iftype type)
1521 {
1522         struct ieee80211_local *local = sdata->local;
1523         int ret, err;
1524         enum nl80211_iftype internal_type = type;
1525         bool p2p = false;
1526
1527         ASSERT_RTNL();
1528
1529         if (!local->ops->change_interface)
1530                 return -EBUSY;
1531
1532         switch (sdata->vif.type) {
1533         case NL80211_IFTYPE_AP:
1534         case NL80211_IFTYPE_STATION:
1535         case NL80211_IFTYPE_ADHOC:
1536         case NL80211_IFTYPE_OCB:
1537                 /*
1538                  * Could maybe also all others here?
1539                  * Just not sure how that interacts
1540                  * with the RX/config path e.g. for
1541                  * mesh.
1542                  */
1543                 break;
1544         default:
1545                 return -EBUSY;
1546         }
1547
1548         switch (type) {
1549         case NL80211_IFTYPE_AP:
1550         case NL80211_IFTYPE_STATION:
1551         case NL80211_IFTYPE_ADHOC:
1552         case NL80211_IFTYPE_OCB:
1553                 /*
1554                  * Could probably support everything
1555                  * but WDS here (WDS do_open can fail
1556                  * under memory pressure, which this
1557                  * code isn't prepared to handle).
1558                  */
1559                 break;
1560         case NL80211_IFTYPE_P2P_CLIENT:
1561                 p2p = true;
1562                 internal_type = NL80211_IFTYPE_STATION;
1563                 break;
1564         case NL80211_IFTYPE_P2P_GO:
1565                 p2p = true;
1566                 internal_type = NL80211_IFTYPE_AP;
1567                 break;
1568         default:
1569                 return -EBUSY;
1570         }
1571
1572         ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1573         if (ret)
1574                 return ret;
1575
1576         ieee80211_do_stop(sdata, false);
1577
1578         ieee80211_teardown_sdata(sdata);
1579
1580         ret = drv_change_interface(local, sdata, internal_type, p2p);
1581         if (ret)
1582                 type = ieee80211_vif_type_p2p(&sdata->vif);
1583
1584         /*
1585          * Ignore return value here, there's not much we can do since
1586          * the driver changed the interface type internally already.
1587          * The warnings will hopefully make driver authors fix it :-)
1588          */
1589         ieee80211_check_queues(sdata, type);
1590
1591         ieee80211_setup_sdata(sdata, type);
1592
1593         err = ieee80211_do_open(&sdata->wdev, false);
1594         WARN(err, "type change: do_open returned %d", err);
1595
1596         return ret;
1597 }
1598
1599 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1600                              enum nl80211_iftype type)
1601 {
1602         int ret;
1603
1604         ASSERT_RTNL();
1605
1606         if (type == ieee80211_vif_type_p2p(&sdata->vif))
1607                 return 0;
1608
1609         if (ieee80211_sdata_running(sdata)) {
1610                 ret = ieee80211_runtime_change_iftype(sdata, type);
1611                 if (ret)
1612                         return ret;
1613         } else {
1614                 /* Purge and reset type-dependent state. */
1615                 ieee80211_teardown_sdata(sdata);
1616                 ieee80211_setup_sdata(sdata, type);
1617         }
1618
1619         /* reset some values that shouldn't be kept across type changes */
1620         if (type == NL80211_IFTYPE_STATION)
1621                 sdata->u.mgd.use_4addr = false;
1622
1623         return 0;
1624 }
1625
1626 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1627                                        u8 *perm_addr, enum nl80211_iftype type)
1628 {
1629         struct ieee80211_sub_if_data *sdata;
1630         u64 mask, start, addr, val, inc;
1631         u8 *m;
1632         u8 tmp_addr[ETH_ALEN];
1633         int i;
1634
1635         /* default ... something at least */
1636         memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1637
1638         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1639             local->hw.wiphy->n_addresses <= 1)
1640                 return;
1641
1642         mutex_lock(&local->iflist_mtx);
1643
1644         switch (type) {
1645         case NL80211_IFTYPE_MONITOR:
1646                 /* doesn't matter */
1647                 break;
1648         case NL80211_IFTYPE_WDS:
1649         case NL80211_IFTYPE_AP_VLAN:
1650                 /* match up with an AP interface */
1651                 list_for_each_entry(sdata, &local->interfaces, list) {
1652                         if (sdata->vif.type != NL80211_IFTYPE_AP)
1653                                 continue;
1654                         memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1655                         break;
1656                 }
1657                 /* keep default if no AP interface present */
1658                 break;
1659         case NL80211_IFTYPE_P2P_CLIENT:
1660         case NL80211_IFTYPE_P2P_GO:
1661                 if (ieee80211_hw_check(&local->hw, P2P_DEV_ADDR_FOR_INTF)) {
1662                         list_for_each_entry(sdata, &local->interfaces, list) {
1663                                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1664                                         continue;
1665                                 if (!ieee80211_sdata_running(sdata))
1666                                         continue;
1667                                 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1668                                 goto out_unlock;
1669                         }
1670                 }
1671                 /* otherwise fall through */
1672         default:
1673                 /* assign a new address if possible -- try n_addresses first */
1674                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1675                         bool used = false;
1676
1677                         list_for_each_entry(sdata, &local->interfaces, list) {
1678                                 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr,
1679                                                      sdata->vif.addr)) {
1680                                         used = true;
1681                                         break;
1682                                 }
1683                         }
1684
1685                         if (!used) {
1686                                 memcpy(perm_addr,
1687                                        local->hw.wiphy->addresses[i].addr,
1688                                        ETH_ALEN);
1689                                 break;
1690                         }
1691                 }
1692
1693                 /* try mask if available */
1694                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1695                         break;
1696
1697                 m = local->hw.wiphy->addr_mask;
1698                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1699                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1700                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1701
1702                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1703                         /* not a contiguous mask ... not handled now! */
1704                         pr_info("not contiguous\n");
1705                         break;
1706                 }
1707
1708                 /*
1709                  * Pick address of existing interface in case user changed
1710                  * MAC address manually, default to perm_addr.
1711                  */
1712                 m = local->hw.wiphy->perm_addr;
1713                 list_for_each_entry(sdata, &local->interfaces, list) {
1714                         if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
1715                                 continue;
1716                         m = sdata->vif.addr;
1717                         break;
1718                 }
1719                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1720                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1721                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1722
1723                 inc = 1ULL<<__ffs64(mask);
1724                 val = (start & mask);
1725                 addr = (start & ~mask) | (val & mask);
1726                 do {
1727                         bool used = false;
1728
1729                         tmp_addr[5] = addr >> 0*8;
1730                         tmp_addr[4] = addr >> 1*8;
1731                         tmp_addr[3] = addr >> 2*8;
1732                         tmp_addr[2] = addr >> 3*8;
1733                         tmp_addr[1] = addr >> 4*8;
1734                         tmp_addr[0] = addr >> 5*8;
1735
1736                         val += inc;
1737
1738                         list_for_each_entry(sdata, &local->interfaces, list) {
1739                                 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) {
1740                                         used = true;
1741                                         break;
1742                                 }
1743                         }
1744
1745                         if (!used) {
1746                                 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1747                                 break;
1748                         }
1749                         addr = (start & ~mask) | (val & mask);
1750                 } while (addr != start);
1751
1752                 break;
1753         }
1754
1755  out_unlock:
1756         mutex_unlock(&local->iflist_mtx);
1757 }
1758
1759 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1760                      unsigned char name_assign_type,
1761                      struct wireless_dev **new_wdev, enum nl80211_iftype type,
1762                      struct vif_params *params)
1763 {
1764         struct net_device *ndev = NULL;
1765         struct ieee80211_sub_if_data *sdata = NULL;
1766         struct txq_info *txqi;
1767         void (*if_setup)(struct net_device *dev);
1768         int ret, i;
1769         int txqs = 1;
1770
1771         ASSERT_RTNL();
1772
1773         if (type == NL80211_IFTYPE_P2P_DEVICE || type == NL80211_IFTYPE_NAN) {
1774                 struct wireless_dev *wdev;
1775
1776                 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1777                                 GFP_KERNEL);
1778                 if (!sdata)
1779                         return -ENOMEM;
1780                 wdev = &sdata->wdev;
1781
1782                 sdata->dev = NULL;
1783                 strlcpy(sdata->name, name, IFNAMSIZ);
1784                 ieee80211_assign_perm_addr(local, wdev->address, type);
1785                 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1786         } else {
1787                 int size = ALIGN(sizeof(*sdata) + local->hw.vif_data_size,
1788                                  sizeof(void *));
1789                 int txq_size = 0;
1790
1791                 if (local->ops->wake_tx_queue)
1792                         txq_size += sizeof(struct txq_info) +
1793                                     local->hw.txq_data_size;
1794
1795                 if (local->ops->wake_tx_queue)
1796                         if_setup = ieee80211_if_setup_no_queue;
1797                 else
1798                         if_setup = ieee80211_if_setup;
1799
1800                 if (local->hw.queues >= IEEE80211_NUM_ACS)
1801                         txqs = IEEE80211_NUM_ACS;
1802
1803                 ndev = alloc_netdev_mqs(size + txq_size,
1804                                         name, name_assign_type,
1805                                         if_setup, txqs, 1);
1806                 if (!ndev)
1807                         return -ENOMEM;
1808                 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1809
1810                 ndev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1811                 if (!ndev->tstats) {
1812                         free_netdev(ndev);
1813                         return -ENOMEM;
1814                 }
1815
1816                 ndev->needed_headroom = local->tx_headroom +
1817                                         4*6 /* four MAC addresses */
1818                                         + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1819                                         + 6 /* mesh */
1820                                         + 8 /* rfc1042/bridge tunnel */
1821                                         - ETH_HLEN /* ethernet hard_header_len */
1822                                         + IEEE80211_ENCRYPT_HEADROOM;
1823                 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1824
1825                 ret = dev_alloc_name(ndev, ndev->name);
1826                 if (ret < 0) {
1827                         ieee80211_if_free(ndev);
1828                         return ret;
1829                 }
1830
1831                 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1832                 if (params && is_valid_ether_addr(params->macaddr))
1833                         memcpy(ndev->dev_addr, params->macaddr, ETH_ALEN);
1834                 else
1835                         memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1836                 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1837
1838                 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1839                 sdata = netdev_priv(ndev);
1840                 ndev->ieee80211_ptr = &sdata->wdev;
1841                 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1842                 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1843
1844                 if (txq_size) {
1845                         txqi = netdev_priv(ndev) + size;
1846                         ieee80211_txq_init(sdata, NULL, txqi, 0);
1847                 }
1848
1849                 sdata->dev = ndev;
1850         }
1851
1852         /* initialise type-independent data */
1853         sdata->wdev.wiphy = local->hw.wiphy;
1854         sdata->local = local;
1855
1856         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1857                 skb_queue_head_init(&sdata->fragments[i].skb_list);
1858
1859         INIT_LIST_HEAD(&sdata->key_list);
1860
1861         INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
1862                           ieee80211_dfs_cac_timer_work);
1863         INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
1864                           ieee80211_delayed_tailroom_dec);
1865
1866         for (i = 0; i < NUM_NL80211_BANDS; i++) {
1867                 struct ieee80211_supported_band *sband;
1868                 sband = local->hw.wiphy->bands[i];
1869                 sdata->rc_rateidx_mask[i] =
1870                         sband ? (1 << sband->n_bitrates) - 1 : 0;
1871                 if (sband) {
1872                         __le16 cap;
1873                         u16 *vht_rate_mask;
1874
1875                         memcpy(sdata->rc_rateidx_mcs_mask[i],
1876                                sband->ht_cap.mcs.rx_mask,
1877                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1878
1879                         cap = sband->vht_cap.vht_mcs.rx_mcs_map;
1880                         vht_rate_mask = sdata->rc_rateidx_vht_mcs_mask[i];
1881                         ieee80211_get_vht_mask_from_cap(cap, vht_rate_mask);
1882                 } else {
1883                         memset(sdata->rc_rateidx_mcs_mask[i], 0,
1884                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1885                         memset(sdata->rc_rateidx_vht_mcs_mask[i], 0,
1886                                sizeof(sdata->rc_rateidx_vht_mcs_mask[i]));
1887                 }
1888         }
1889
1890         ieee80211_set_default_queues(sdata);
1891
1892         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1893         sdata->user_power_level = local->user_power_level;
1894
1895         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1896
1897         /* setup type-dependent data */
1898         ieee80211_setup_sdata(sdata, type);
1899
1900         if (ndev) {
1901                 if (params) {
1902                         ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1903                         if (type == NL80211_IFTYPE_STATION)
1904                                 sdata->u.mgd.use_4addr = params->use_4addr;
1905                 }
1906
1907                 ndev->features |= local->hw.netdev_features;
1908
1909                 netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops);
1910
1911                 /* MTU range: 256 - 2304 */
1912                 ndev->min_mtu = 256;
1913                 ndev->max_mtu = IEEE80211_MAX_DATA_LEN;
1914
1915                 ret = register_netdevice(ndev);
1916                 if (ret) {
1917                         ieee80211_if_free(ndev);
1918                         return ret;
1919                 }
1920         }
1921
1922         mutex_lock(&local->iflist_mtx);
1923         list_add_tail_rcu(&sdata->list, &local->interfaces);
1924         mutex_unlock(&local->iflist_mtx);
1925
1926         if (new_wdev)
1927                 *new_wdev = &sdata->wdev;
1928
1929         return 0;
1930 }
1931
1932 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1933 {
1934         ASSERT_RTNL();
1935
1936         mutex_lock(&sdata->local->iflist_mtx);
1937         list_del_rcu(&sdata->list);
1938         mutex_unlock(&sdata->local->iflist_mtx);
1939
1940         synchronize_rcu();
1941
1942         if (sdata->dev) {
1943                 unregister_netdevice(sdata->dev);
1944         } else {
1945                 cfg80211_unregister_wdev(&sdata->wdev);
1946                 ieee80211_teardown_sdata(sdata);
1947                 kfree(sdata);
1948         }
1949 }
1950
1951 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
1952 {
1953         if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
1954                 return;
1955         ieee80211_do_stop(sdata, true);
1956 }
1957
1958 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1959 {
1960         struct ieee80211_sub_if_data *sdata, *tmp;
1961         LIST_HEAD(unreg_list);
1962         LIST_HEAD(wdev_list);
1963
1964         ASSERT_RTNL();
1965
1966         /* Before destroying the interfaces, make sure they're all stopped so
1967          * that the hardware is stopped. Otherwise, the driver might still be
1968          * iterating the interfaces during the shutdown, e.g. from a worker
1969          * or from RX processing or similar, and if it does so (using atomic
1970          * iteration) while we're manipulating the list, the iteration will
1971          * crash.
1972          *
1973          * After this, the hardware should be stopped and the driver should
1974          * have stopped all of its activities, so that we can do RCU-unaware
1975          * manipulations of the interface list below.
1976          */
1977         cfg80211_shutdown_all_interfaces(local->hw.wiphy);
1978
1979         WARN(local->open_count, "%s: open count remains %d\n",
1980              wiphy_name(local->hw.wiphy), local->open_count);
1981
1982         mutex_lock(&local->iflist_mtx);
1983         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1984                 list_del(&sdata->list);
1985
1986                 if (sdata->dev)
1987                         unregister_netdevice_queue(sdata->dev, &unreg_list);
1988                 else
1989                         list_add(&sdata->list, &wdev_list);
1990         }
1991         mutex_unlock(&local->iflist_mtx);
1992         unregister_netdevice_many(&unreg_list);
1993
1994         list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
1995                 list_del(&sdata->list);
1996                 cfg80211_unregister_wdev(&sdata->wdev);
1997                 kfree(sdata);
1998         }
1999 }
2000
2001 static int netdev_notify(struct notifier_block *nb,
2002                          unsigned long state, void *ptr)
2003 {
2004         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2005         struct ieee80211_sub_if_data *sdata;
2006
2007         if (state != NETDEV_CHANGENAME)
2008                 return NOTIFY_DONE;
2009
2010         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
2011                 return NOTIFY_DONE;
2012
2013         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
2014                 return NOTIFY_DONE;
2015
2016         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2017         memcpy(sdata->name, dev->name, IFNAMSIZ);
2018         ieee80211_debugfs_rename_netdev(sdata);
2019
2020         return NOTIFY_OK;
2021 }
2022
2023 static struct notifier_block mac80211_netdev_notifier = {
2024         .notifier_call = netdev_notify,
2025 };
2026
2027 int ieee80211_iface_init(void)
2028 {
2029         return register_netdevice_notifier(&mac80211_netdev_notifier);
2030 }
2031
2032 void ieee80211_iface_exit(void)
2033 {
2034         unregister_netdevice_notifier(&mac80211_netdev_notifier);
2035 }
2036
2037 void ieee80211_vif_inc_num_mcast(struct ieee80211_sub_if_data *sdata)
2038 {
2039         if (sdata->vif.type == NL80211_IFTYPE_AP)
2040                 atomic_inc(&sdata->u.ap.num_mcast_sta);
2041         else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2042                 atomic_inc(&sdata->u.vlan.num_mcast_sta);
2043 }
2044
2045 void ieee80211_vif_dec_num_mcast(struct ieee80211_sub_if_data *sdata)
2046 {
2047         if (sdata->vif.type == NL80211_IFTYPE_AP)
2048                 atomic_dec(&sdata->u.ap.num_mcast_sta);
2049         else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2050                 atomic_dec(&sdata->u.vlan.num_mcast_sta);
2051 }