net/mac80211/iface.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Interface handling
   4  *
   5  * Copyright 2002-2005, Instant802 Networks, Inc.
   6  * Copyright 2005-2006, Devicescape Software, Inc.
   7  * Copyright (c) 2006 Jiri Benc <jbenc@suse.cz>
   8  * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
   9  * Copyright 2013-2014  Intel Mobile Communications GmbH
  10  * Copyright (c) 2016        Intel Deutschland GmbH
  11  * Copyright (C) 2018 Intel Corporation
  12  */
  13 #include <linux/slab.h>
  14 #include <linux/kernel.h>
  15 #include <linux/if_arp.h>
  16 #include <linux/netdevice.h>
  17 #include <linux/rtnetlink.h>
  18 #include <net/mac80211.h>
  19 #include <net/ieee80211_radiotap.h>
  20 #include "ieee80211_i.h"
  21 #include "sta_info.h"
  22 #include "debugfs_netdev.h"
  23 #include "mesh.h"
  24 #include "led.h"
  25 #include "driver-ops.h"
  26 #include "wme.h"
  27 #include "rate.h"
  28
  29 /**
  30  * DOC: Interface list locking
  31  *
  32  * The interface list in each struct ieee80211_local is protected
  33  * three-fold:
  34  *
  35  * (1) modifications may only be done under the RTNL
  36  * (2) modifications and readers are protected against each other by
  37  *     the iflist_mtx.
  38  * (3) modifications are done in an RCU manner so atomic readers
  39  *     can traverse the list in RCU-safe blocks.
  40  *
  41  * As a consequence, reads (traversals) of the list can be protected
  42  * by either the RTNL, the iflist_mtx or RCU.
  43  */
  44
  45 static void ieee80211_iface_work(struct work_struct *work);
  46
  47 bool __ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
  48 {
  49         struct ieee80211_chanctx_conf *chanctx_conf;
  50         int power;
  51
  52         rcu_read_lock();
  53         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
  54         if (!chanctx_conf) {
  55                 rcu_read_unlock();
  56                 return false;
  57         }
  58
  59         power = ieee80211_chandef_max_power(&chanctx_conf->def);
  60         rcu_read_unlock();
  61
  62         if (sdata->user_power_level != IEEE80211_UNSET_POWER_LEVEL)
  63                 power = min(power, sdata->user_power_level);
  64
  65         if (sdata->ap_power_level != IEEE80211_UNSET_POWER_LEVEL)
  66                 power = min(power, sdata->ap_power_level);
  67
  68         if (power != sdata->vif.bss_conf.txpower) {
  69                 sdata->vif.bss_conf.txpower = power;
  70                 ieee80211_hw_config(sdata->local, 0);
  71                 return true;
  72         }
  73
  74         return false;
  75 }
  76
  77 void ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata,
  78                               bool update_bss)
  79 {
  80         if (__ieee80211_recalc_txpower(sdata) ||
  81             (update_bss && ieee80211_sdata_running(sdata)))
  82                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_TXPOWER);
  83 }
  84
  85 static u32 __ieee80211_idle_off(struct ieee80211_local *local)
  86 {
  87         if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
  88                 return 0;
  89
  90         local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
  91         return IEEE80211_CONF_CHANGE_IDLE;
  92 }
  93
  94 static u32 __ieee80211_idle_on(struct ieee80211_local *local)
  95 {
  96         if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
  97                 return 0;
  98
  99         ieee80211_flush_queues(local, NULL, false);
 100
 101         local->hw.conf.flags |= IEEE80211_CONF_IDLE;
 102         return IEEE80211_CONF_CHANGE_IDLE;
 103 }
 104
 105 static u32 __ieee80211_recalc_idle(struct ieee80211_local *local,
 106                                    bool force_active)
 107 {
 108         bool working, scanning, active;
 109         unsigned int led_trig_start = 0, led_trig_stop = 0;
 110
 111         lockdep_assert_held(&local->mtx);
 112
 113         active = force_active ||
 114                  !list_empty(&local->chanctx_list) ||
 115                  local->monitors;
 116
 117         working = !local->ops->remain_on_channel &&
 118                   !list_empty(&local->roc_list);
 119
 120         scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) ||
 121                    test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning);
 122
 123         if (working || scanning)
 124                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
 125         else
 126                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
 127
 128         if (active)
 129                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
 130         else
 131                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
 132
 133         ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
 134
 135         if (working || scanning || active)
 136                 return __ieee80211_idle_off(local);
 137         return __ieee80211_idle_on(local);
 138 }
 139
 140 u32 ieee80211_idle_off(struct ieee80211_local *local)
 141 {
 142         return __ieee80211_recalc_idle(local, true);
 143 }
 144
 145 void ieee80211_recalc_idle(struct ieee80211_local *local)
 146 {
 147         u32 change = __ieee80211_recalc_idle(local, false);
 148         if (change)
 149                 ieee80211_hw_config(local, change);
 150 }
 151
 152 static int ieee80211_verify_mac(struct ieee80211_sub_if_data *sdata, u8 *addr,
 153                                 bool check_dup)
 154 {
 155         struct ieee80211_local *local = sdata->local;
 156         struct ieee80211_sub_if_data *iter;
 157         u64 new, mask, tmp;
 158         u8 *m;
 159         int ret = 0;
 160
 161         if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
 162                 return 0;
 163
 164         m = addr;
 165         new =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 166                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 167                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 168
 169         m = local->hw.wiphy->addr_mask;
 170         mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 171                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 172                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 173
 174         if (!check_dup)
 175                 return ret;
 176
 177         mutex_lock(&local->iflist_mtx);
 178         list_for_each_entry(iter, &local->interfaces, list) {
 179                 if (iter == sdata)
 180                         continue;
 181
 182                 if (iter->vif.type == NL80211_IFTYPE_MONITOR &&
 183                     !(iter->u.mntr.flags & MONITOR_FLAG_ACTIVE))
 184                         continue;
 185
 186                 m = iter->vif.addr;
 187                 tmp =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 188                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 189                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 190
 191                 if ((new & ~mask) != (tmp & ~mask)) {
 192                         ret = -EINVAL;
 193                         break;
 194                 }
 195         }
 196         mutex_unlock(&local->iflist_mtx);
 197
 198         return ret;
 199 }
 200
 201 static int ieee80211_change_mac(struct net_device *dev, void *addr)
 202 {
 203         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 204         struct sockaddr *sa = addr;
 205         bool check_dup = true;
 206         int ret;
 207
 208         if (ieee80211_sdata_running(sdata))
 209                 return -EBUSY;
 210
 211         if (sdata->vif.type == NL80211_IFTYPE_MONITOR &&
 212             !(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
 213                 check_dup = false;
 214
 215         ret = ieee80211_verify_mac(sdata, sa->sa_data, check_dup);
 216         if (ret)
 217                 return ret;
 218
 219         ret = eth_mac_addr(dev, sa);
 220
 221         if (ret == 0)
 222                 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
 223
 224         return ret;
 225 }
 226
 227 static inline int identical_mac_addr_allowed(int type1, int type2)
 228 {
 229         return type1 == NL80211_IFTYPE_MONITOR ||
 230                 type2 == NL80211_IFTYPE_MONITOR ||
 231                 type1 == NL80211_IFTYPE_P2P_DEVICE ||
 232                 type2 == NL80211_IFTYPE_P2P_DEVICE ||
 233                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
 234                 (type1 == NL80211_IFTYPE_WDS &&
 235                         (type2 == NL80211_IFTYPE_WDS ||
 236                          type2 == NL80211_IFTYPE_AP)) ||
 237                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
 238                 (type1 == NL80211_IFTYPE_AP_VLAN &&
 239                         (type2 == NL80211_IFTYPE_AP ||
 240                          type2 == NL80211_IFTYPE_AP_VLAN));
 241 }
 242
 243 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
 244                                             enum nl80211_iftype iftype)
 245 {
 246         struct ieee80211_local *local = sdata->local;
 247         struct ieee80211_sub_if_data *nsdata;
 248         int ret;
 249
 250         ASSERT_RTNL();
 251
 252         /* we hold the RTNL here so can safely walk the list */
 253         list_for_each_entry(nsdata, &local->interfaces, list) {
 254                 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
 255                         /*
 256                          * Only OCB and monitor mode may coexist
 257                          */
 258                         if ((sdata->vif.type == NL80211_IFTYPE_OCB &&
 259                              nsdata->vif.type != NL80211_IFTYPE_MONITOR) ||
 260                             (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
 261                              nsdata->vif.type == NL80211_IFTYPE_OCB))
 262                                 return -EBUSY;
 263
 264                         /*
 265                          * Allow only a single IBSS interface to be up at any
 266                          * time. This is restricted because beacon distribution
 267                          * cannot work properly if both are in the same IBSS.
 268                          *
 269                          * To remove this restriction we'd have to disallow them
 270                          * from setting the same SSID on different IBSS interfaces
 271                          * belonging to the same hardware. Then, however, we're
 272                          * faced with having to adopt two different TSF timers...
 273                          */
 274                         if (iftype == NL80211_IFTYPE_ADHOC &&
 275                             nsdata->vif.type == NL80211_IFTYPE_ADHOC)
 276                                 return -EBUSY;
 277                         /*
 278                          * will not add another interface while any channel
 279                          * switch is active.
 280                          */
 281                         if (nsdata->vif.csa_active)
 282                                 return -EBUSY;
 283
 284                         /*
 285                          * The remaining checks are only performed for interfaces
 286                          * with the same MAC address.
 287                          */
 288                         if (!ether_addr_equal(sdata->vif.addr,
 289                                               nsdata->vif.addr))
 290                                 continue;
 291
 292                         /*
 293                          * check whether it may have the same address
 294                          */
 295                         if (!identical_mac_addr_allowed(iftype,
 296                                                         nsdata->vif.type))
 297                                 return -ENOTUNIQ;
 298
 299                         /*
 300                          * can only add VLANs to enabled APs
 301                          */
 302                         if (iftype == NL80211_IFTYPE_AP_VLAN &&
 303                             nsdata->vif.type == NL80211_IFTYPE_AP)
 304                                 sdata->bss = &nsdata->u.ap;
 305                 }
 306         }
 307
 308         mutex_lock(&local->chanctx_mtx);
 309         ret = ieee80211_check_combinations(sdata, NULL, 0, 0);
 310         mutex_unlock(&local->chanctx_mtx);
 311         return ret;
 312 }
 313
 314 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata,
 315                                   enum nl80211_iftype iftype)
 316 {
 317         int n_queues = sdata->local->hw.queues;
 318         int i;
 319
 320         if (iftype == NL80211_IFTYPE_NAN)
 321                 return 0;
 322
 323         if (iftype != NL80211_IFTYPE_P2P_DEVICE) {
 324                 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 325                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
 326                                          IEEE80211_INVAL_HW_QUEUE))
 327                                 return -EINVAL;
 328                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
 329                                          n_queues))
 330                                 return -EINVAL;
 331                 }
 332         }
 333
 334         if ((iftype != NL80211_IFTYPE_AP &&
 335              iftype != NL80211_IFTYPE_P2P_GO &&
 336              iftype != NL80211_IFTYPE_MESH_POINT) ||
 337             !ieee80211_hw_check(&sdata->local->hw, QUEUE_CONTROL)) {
 338                 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
 339                 return 0;
 340         }
 341
 342         if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
 343                 return -EINVAL;
 344
 345         if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
 346                 return -EINVAL;
 347
 348         return 0;
 349 }
 350
 351 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
 352                                     const int offset)
 353 {
 354         struct ieee80211_local *local = sdata->local;
 355         u32 flags = sdata->u.mntr.flags;
 356
 357 #define ADJUST(_f, _s)  do {                                    \
 358         if (flags & MONITOR_FLAG_##_f)                          \
 359                 local->fif_##_s += offset;                      \
 360         } while (0)
 361
 362         ADJUST(FCSFAIL, fcsfail);
 363         ADJUST(PLCPFAIL, plcpfail);
 364         ADJUST(CONTROL, control);
 365         ADJUST(CONTROL, pspoll);
 366         ADJUST(OTHER_BSS, other_bss);
 367
 368 #undef ADJUST
 369 }
 370
 371 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
 372 {
 373         struct ieee80211_local *local = sdata->local;
 374         int i;
 375
 376         for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 377                 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
 378                         sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
 379                 else if (local->hw.queues >= IEEE80211_NUM_ACS)
 380                         sdata->vif.hw_queue[i] = i;
 381                 else
 382                         sdata->vif.hw_queue[i] = 0;
 383         }
 384         sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
 385 }
 386
 387 int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
 388 {
 389         struct ieee80211_sub_if_data *sdata;
 390         int ret;
 391
 392         if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
 393                 return 0;
 394
 395         ASSERT_RTNL();
 396
 397         if (local->monitor_sdata)
 398                 return 0;
 399
 400         sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
 401         if (!sdata)
 402                 return -ENOMEM;
 403
 404         /* set up data */
 405         sdata->local = local;
 406         sdata->vif.type = NL80211_IFTYPE_MONITOR;
 407         snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
 408                  wiphy_name(local->hw.wiphy));
 409         sdata->wdev.iftype = NL80211_IFTYPE_MONITOR;
 410
 411         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
 412
 413         ieee80211_set_default_queues(sdata);
 414
 415         ret = drv_add_interface(local, sdata);
 416         if (WARN_ON(ret)) {
 417                 /* ok .. stupid driver, it asked for this! */
 418                 kfree(sdata);
 419                 return ret;
 420         }
 421
 422         ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR);
 423         if (ret) {
 424                 kfree(sdata);
 425                 return ret;
 426         }
 427
 428         mutex_lock(&local->iflist_mtx);
 429         rcu_assign_pointer(local->monitor_sdata, sdata);
 430         mutex_unlock(&local->iflist_mtx);
 431
 432         mutex_lock(&local->mtx);
 433         ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef,
 434                                         IEEE80211_CHANCTX_EXCLUSIVE);
 435         mutex_unlock(&local->mtx);
 436         if (ret) {
 437                 mutex_lock(&local->iflist_mtx);
 438                 RCU_INIT_POINTER(local->monitor_sdata, NULL);
 439                 mutex_unlock(&local->iflist_mtx);
 440                 synchronize_net();
 441                 drv_remove_interface(local, sdata);
 442                 kfree(sdata);
 443                 return ret;
 444         }
 445
 446         skb_queue_head_init(&sdata->skb_queue);
 447         INIT_WORK(&sdata->work, ieee80211_iface_work);
 448
 449         return 0;
 450 }
 451
 452 void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
 453 {
 454         struct ieee80211_sub_if_data *sdata;
 455
 456         if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
 457                 return;
 458
 459         ASSERT_RTNL();
 460
 461         mutex_lock(&local->iflist_mtx);
 462
 463         sdata = rcu_dereference_protected(local->monitor_sdata,
 464                                           lockdep_is_held(&local->iflist_mtx));
 465         if (!sdata) {
 466                 mutex_unlock(&local->iflist_mtx);
 467                 return;
 468         }
 469
 470         RCU_INIT_POINTER(local->monitor_sdata, NULL);
 471         mutex_unlock(&local->iflist_mtx);
 472
 473         synchronize_net();
 474
 475         mutex_lock(&local->mtx);
 476         ieee80211_vif_release_channel(sdata);
 477         mutex_unlock(&local->mtx);
 478
 479         drv_remove_interface(local, sdata);
 480
 481         kfree(sdata);
 482 }
 483
 484 /*
 485  * NOTE: Be very careful when changing this function, it must NOT return
 486  * an error on interface type changes that have been pre-checked, so most
 487  * checks should be in ieee80211_check_concurrent_iface.
 488  */
 489 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
 490 {
 491         struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
 492         struct net_device *dev = wdev->netdev;
 493         struct ieee80211_local *local = sdata->local;
 494         struct sta_info *sta;
 495         u32 changed = 0;
 496         int res;
 497         u32 hw_reconf_flags = 0;
 498
 499         switch (sdata->vif.type) {
 500         case NL80211_IFTYPE_WDS:
 501                 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
 502                         return -ENOLINK;
 503                 break;
 504         case NL80211_IFTYPE_AP_VLAN: {
 505                 struct ieee80211_sub_if_data *master;
 506
 507                 if (!sdata->bss)
 508                         return -ENOLINK;
 509
 510                 mutex_lock(&local->mtx);
 511                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
 512                 mutex_unlock(&local->mtx);
 513
 514                 master = container_of(sdata->bss,
 515                                       struct ieee80211_sub_if_data, u.ap);
 516                 sdata->control_port_protocol =
 517                         master->control_port_protocol;
 518                 sdata->control_port_no_encrypt =
 519                         master->control_port_no_encrypt;
 520                 sdata->control_port_over_nl80211 =
 521                         master->control_port_over_nl80211;
 522                 sdata->vif.cab_queue = master->vif.cab_queue;
 523                 memcpy(sdata->vif.hw_queue, master->vif.hw_queue,
 524                        sizeof(sdata->vif.hw_queue));
 525                 sdata->vif.bss_conf.chandef = master->vif.bss_conf.chandef;
 526
 527                 mutex_lock(&local->key_mtx);
 528                 sdata->crypto_tx_tailroom_needed_cnt +=
 529                         master->crypto_tx_tailroom_needed_cnt;
 530                 mutex_unlock(&local->key_mtx);
 531
 532                 break;
 533                 }
 534         case NL80211_IFTYPE_AP:
 535                 sdata->bss = &sdata->u.ap;
 536                 break;
 537         case NL80211_IFTYPE_MESH_POINT:
 538         case NL80211_IFTYPE_STATION:
 539         case NL80211_IFTYPE_MONITOR:
 540         case NL80211_IFTYPE_ADHOC:
 541         case NL80211_IFTYPE_P2P_DEVICE:
 542         case NL80211_IFTYPE_OCB:
 543         case NL80211_IFTYPE_NAN:
 544                 /* no special treatment */
 545                 break;
 546         case NL80211_IFTYPE_UNSPECIFIED:
 547         case NUM_NL80211_IFTYPES:
 548         case NL80211_IFTYPE_P2P_CLIENT:
 549         case NL80211_IFTYPE_P2P_GO:
 550                 /* cannot happen */
 551                 WARN_ON(1);
 552                 break;
 553         }
 554
 555         if (local->open_count == 0) {
 556                 res = drv_start(local);
 557                 if (res)
 558                         goto err_del_bss;
 559                 /* we're brought up, everything changes */
 560                 hw_reconf_flags = ~0;
 561                 ieee80211_led_radio(local, true);
 562                 ieee80211_mod_tpt_led_trig(local,
 563                                            IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
 564         }
 565
 566         /*
 567          * Copy the hopefully now-present MAC address to
 568          * this interface, if it has the special null one.
 569          */
 570         if (dev && is_zero_ether_addr(dev->dev_addr)) {
 571                 memcpy(dev->dev_addr,
 572                        local->hw.wiphy->perm_addr,
 573                        ETH_ALEN);
 574                 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
 575
 576                 if (!is_valid_ether_addr(dev->dev_addr)) {
 577                         res = -EADDRNOTAVAIL;
 578                         goto err_stop;
 579                 }
 580         }
 581
 582         switch (sdata->vif.type) {
 583         case NL80211_IFTYPE_AP_VLAN:
 584                 /* no need to tell driver, but set carrier and chanctx */
 585                 if (rtnl_dereference(sdata->bss->beacon)) {
 586                         ieee80211_vif_vlan_copy_chanctx(sdata);
 587                         netif_carrier_on(dev);
 588                 } else {
 589                         netif_carrier_off(dev);
 590                 }
 591                 break;
 592         case NL80211_IFTYPE_MONITOR:
 593                 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
 594                         local->cooked_mntrs++;
 595                         break;
 596                 }
 597
 598                 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) {
 599                         res = drv_add_interface(local, sdata);
 600                         if (res)
 601                                 goto err_stop;
 602                 } else if (local->monitors == 0 && local->open_count == 0) {
 603                         res = ieee80211_add_virtual_monitor(local);
 604                         if (res)
 605                                 goto err_stop;
 606                 }
 607
 608                 /* must be before the call to ieee80211_configure_filter */
 609                 local->monitors++;
 610                 if (local->monitors == 1) {
 611                         local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
 612                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 613                 }
 614
 615                 ieee80211_adjust_monitor_flags(sdata, 1);
 616                 ieee80211_configure_filter(local);
 617                 mutex_lock(&local->mtx);
 618                 ieee80211_recalc_idle(local);
 619                 mutex_unlock(&local->mtx);
 620
 621                 netif_carrier_on(dev);
 622                 break;
 623         default:
 624                 if (coming_up) {
 625                         ieee80211_del_virtual_monitor(local);
 626
 627                         res = drv_add_interface(local, sdata);
 628                         if (res)
 629                                 goto err_stop;
 630                         res = ieee80211_check_queues(sdata,
 631                                 ieee80211_vif_type_p2p(&sdata->vif));
 632                         if (res)
 633                                 goto err_del_interface;
 634                 }
 635
 636                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
 637                         local->fif_pspoll++;
 638                         local->fif_probe_req++;
 639
 640                         ieee80211_configure_filter(local);
 641                 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 642                         local->fif_probe_req++;
 643                 }
 644
 645                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE &&
 646                     sdata->vif.type != NL80211_IFTYPE_NAN)
 647                         changed |= ieee80211_reset_erp_info(sdata);
 648                 ieee80211_bss_info_change_notify(sdata, changed);
 649
 650                 switch (sdata->vif.type) {
 651                 case NL80211_IFTYPE_STATION:
 652                 case NL80211_IFTYPE_ADHOC:
 653                 case NL80211_IFTYPE_AP:
 654                 case NL80211_IFTYPE_MESH_POINT:
 655                 case NL80211_IFTYPE_OCB:
 656                         netif_carrier_off(dev);
 657                         break;
 658                 case NL80211_IFTYPE_WDS:
 659                 case NL80211_IFTYPE_P2P_DEVICE:
 660                 case NL80211_IFTYPE_NAN:
 661                         break;
 662                 default:
 663                         /* not reached */
 664                         WARN_ON(1);
 665                 }
 666
 667                 /*
 668                  * Set default queue parameters so drivers don't
 669                  * need to initialise the hardware if the hardware
 670                  * doesn't start up with sane defaults.
 671                  * Enable QoS for anything but station interfaces.
 672                  */
 673                 ieee80211_set_wmm_default(sdata, true,
 674                         sdata->vif.type != NL80211_IFTYPE_STATION);
 675         }
 676
 677         set_bit(SDATA_STATE_RUNNING, &sdata->state);
 678
 679         switch (sdata->vif.type) {
 680         case NL80211_IFTYPE_WDS:
 681                 /* Create STA entry for the WDS peer */
 682                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
 683                                      GFP_KERNEL);
 684                 if (!sta) {
 685                         res = -ENOMEM;
 686                         goto err_del_interface;
 687                 }
 688
 689                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
 690                 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
 691                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
 692
 693                 res = sta_info_insert(sta);
 694                 if (res) {
 695                         /* STA has been freed */
 696                         goto err_del_interface;
 697                 }
 698
 699                 rate_control_rate_init(sta);
 700                 netif_carrier_on(dev);
 701                 break;
 702         case NL80211_IFTYPE_P2P_DEVICE:
 703                 rcu_assign_pointer(local->p2p_sdata, sdata);
 704                 break;
 705         case NL80211_IFTYPE_MONITOR:
 706                 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES)
 707                         break;
 708                 list_add_tail_rcu(&sdata->u.mntr.list, &local->mon_list);
 709                 break;
 710         default:
 711                 break;
 712         }
 713
 714         /*
 715          * set_multicast_list will be invoked by the networking core
 716          * which will check whether any increments here were done in
 717          * error and sync them down to the hardware as filter flags.
 718          */
 719         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 720                 atomic_inc(&local->iff_allmultis);
 721
 722         if (coming_up)
 723                 local->open_count++;
 724
 725         if (hw_reconf_flags)
 726                 ieee80211_hw_config(local, hw_reconf_flags);
 727
 728         ieee80211_recalc_ps(local);
 729
 730         if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
 731             sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
 732             local->ops->wake_tx_queue) {
 733                 /* XXX: for AP_VLAN, actually track AP queues */
 734                 if (dev)
 735                         netif_tx_start_all_queues(dev);
 736         } else if (dev) {
 737                 unsigned long flags;
 738                 int n_acs = IEEE80211_NUM_ACS;
 739                 int ac;
 740
 741                 if (local->hw.queues < IEEE80211_NUM_ACS)
 742                         n_acs = 1;
 743
 744                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 745                 if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE ||
 746                     (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 &&
 747                      skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) {
 748                         for (ac = 0; ac < n_acs; ac++) {
 749                                 int ac_queue = sdata->vif.hw_queue[ac];
 750
 751                                 if (local->queue_stop_reasons[ac_queue] == 0 &&
 752                                     skb_queue_empty(&local->pending[ac_queue]))
 753                                         netif_start_subqueue(dev, ac);
 754                         }
 755                 }
 756                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 757         }
 758
 759         return 0;
 760  err_del_interface:
 761         drv_remove_interface(local, sdata);
 762  err_stop:
 763         if (!local->open_count)
 764                 drv_stop(local);
 765  err_del_bss:
 766         sdata->bss = NULL;
 767         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 768                 mutex_lock(&local->mtx);
 769                 list_del(&sdata->u.vlan.list);
 770                 mutex_unlock(&local->mtx);
 771         }
 772         /* might already be clear but that doesn't matter */
 773         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 774         return res;
 775 }
 776
 777 static int ieee80211_open(struct net_device *dev)
 778 {
 779         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 780         int err;
 781
 782         /* fail early if user set an invalid address */
 783         if (!is_valid_ether_addr(dev->dev_addr))
 784                 return -EADDRNOTAVAIL;
 785
 786         err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
 787         if (err)
 788                 return err;
 789
 790         return ieee80211_do_open(&sdata->wdev, true);
 791 }
 792
 793 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
 794                               bool going_down)
 795 {
 796         struct ieee80211_local *local = sdata->local;
 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         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 (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1009                 ieee80211_txq_remove_vlan(local, sdata);
1010
1011         sdata->bss = NULL;
1012
1013         if (local->open_count == 0)
1014                 ieee80211_clear_tx_pending(local);
1015
1016         sdata->vif.bss_conf.beacon_int = 0;
1017
1018         /*
1019          * If the interface goes down while suspended, presumably because
1020          * the device was unplugged and that happens before our resume,
1021          * then the driver is already unconfigured and the remainder of
1022          * this function isn't needed.
1023          * XXX: what about WoWLAN? If the device has software state, e.g.
1024          *      memory allocated, it might expect teardown commands from
1025          *      mac80211 here?
1026          */
1027         if (local->suspended) {
1028                 WARN_ON(local->wowlan);
1029                 WARN_ON(rtnl_dereference(local->monitor_sdata));
1030                 return;
1031         }
1032
1033         switch (sdata->vif.type) {
1034         case NL80211_IFTYPE_AP_VLAN:
1035                 break;
1036         case NL80211_IFTYPE_MONITOR:
1037                 if (local->monitors == 0)
1038                         ieee80211_del_virtual_monitor(local);
1039
1040                 mutex_lock(&local->mtx);
1041                 ieee80211_recalc_idle(local);
1042                 mutex_unlock(&local->mtx);
1043
1044                 if (!(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
1045                         break;
1046
1047                 /* fall through */
1048         default:
1049                 if (going_down)
1050                         drv_remove_interface(local, sdata);
1051         }
1052
1053         ieee80211_recalc_ps(local);
1054
1055         if (cancel_scan)
1056                 flush_delayed_work(&local->scan_work);
1057
1058         if (local->open_count == 0) {
1059                 ieee80211_stop_device(local);
1060
1061                 /* no reconfiguring after stop! */
1062                 return;
1063         }
1064
1065         /* do after stop to avoid reconfiguring when we stop anyway */
1066         ieee80211_configure_filter(local);
1067         ieee80211_hw_config(local, hw_reconf_flags);
1068
1069         if (local->monitors == local->open_count)
1070                 ieee80211_add_virtual_monitor(local);
1071 }
1072
1073 static int ieee80211_stop(struct net_device *dev)
1074 {
1075         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1076
1077         ieee80211_do_stop(sdata, true);
1078
1079         return 0;
1080 }
1081
1082 static void ieee80211_set_multicast_list(struct net_device *dev)
1083 {
1084         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1085         struct ieee80211_local *local = sdata->local;
1086         int allmulti, sdata_allmulti;
1087
1088         allmulti = !!(dev->flags & IFF_ALLMULTI);
1089         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
1090
1091         if (allmulti != sdata_allmulti) {
1092                 if (dev->flags & IFF_ALLMULTI)
1093                         atomic_inc(&local->iff_allmultis);
1094                 else
1095                         atomic_dec(&local->iff_allmultis);
1096                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
1097         }
1098
1099         spin_lock_bh(&local->filter_lock);
1100         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
1101         spin_unlock_bh(&local->filter_lock);
1102         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
1103 }
1104
1105 /*
1106  * Called when the netdev is removed or, by the code below, before
1107  * the interface type changes.
1108  */
1109 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
1110 {
1111         int i;
1112
1113         /* free extra data */
1114         ieee80211_free_keys(sdata, false);
1115
1116         ieee80211_debugfs_remove_netdev(sdata);
1117
1118         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1119                 __skb_queue_purge(&sdata->fragments[i].skb_list);
1120         sdata->fragment_next = 0;
1121
1122         if (ieee80211_vif_is_mesh(&sdata->vif))
1123                 ieee80211_mesh_teardown_sdata(sdata);
1124 }
1125
1126 static void ieee80211_uninit(struct net_device *dev)
1127 {
1128         ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
1129 }
1130
1131 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
1132                                          struct sk_buff *skb,
1133                                          struct net_device *sb_dev)
1134 {
1135         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
1136 }
1137
1138 static void
1139 ieee80211_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
1140 {
1141         int i;
1142
1143         for_each_possible_cpu(i) {
1144                 const struct pcpu_sw_netstats *tstats;
1145                 u64 rx_packets, rx_bytes, tx_packets, tx_bytes;
1146                 unsigned int start;
1147
1148                 tstats = per_cpu_ptr(dev->tstats, i);
1149
1150                 do {
1151                         start = u64_stats_fetch_begin_irq(&tstats->syncp);
1152                         rx_packets = tstats->rx_packets;
1153                         tx_packets = tstats->tx_packets;
1154                         rx_bytes = tstats->rx_bytes;
1155                         tx_bytes = tstats->tx_bytes;
1156                 } while (u64_stats_fetch_retry_irq(&tstats->syncp, start));
1157
1158                 stats->rx_packets += rx_packets;
1159                 stats->tx_packets += tx_packets;
1160                 stats->rx_bytes   += rx_bytes;
1161                 stats->tx_bytes   += tx_bytes;
1162         }
1163 }
1164
1165 static const struct net_device_ops ieee80211_dataif_ops = {
1166         .ndo_open               = ieee80211_open,
1167         .ndo_stop               = ieee80211_stop,
1168         .ndo_uninit             = ieee80211_uninit,
1169         .ndo_start_xmit         = ieee80211_subif_start_xmit,
1170         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1171         .ndo_set_mac_address    = ieee80211_change_mac,
1172         .ndo_select_queue       = ieee80211_netdev_select_queue,
1173         .ndo_get_stats64        = ieee80211_get_stats64,
1174 };
1175
1176 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
1177                                           struct sk_buff *skb,
1178                                           struct net_device *sb_dev)
1179 {
1180         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1181         struct ieee80211_local *local = sdata->local;
1182         struct ieee80211_hdr *hdr;
1183         struct ieee80211_radiotap_header *rtap = (void *)skb->data;
1184
1185         if (local->hw.queues < IEEE80211_NUM_ACS)
1186                 return 0;
1187
1188         if (skb->len < 4 ||
1189             skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
1190                 return 0; /* doesn't matter, frame will be dropped */
1191
1192         hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
1193
1194         return ieee80211_select_queue_80211(sdata, skb, hdr);
1195 }
1196
1197 static const struct net_device_ops ieee80211_monitorif_ops = {
1198         .ndo_open               = ieee80211_open,
1199         .ndo_stop               = ieee80211_stop,
1200         .ndo_uninit             = ieee80211_uninit,
1201         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
1202         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1203         .ndo_set_mac_address    = ieee80211_change_mac,
1204         .ndo_select_queue       = ieee80211_monitor_select_queue,
1205         .ndo_get_stats64        = ieee80211_get_stats64,
1206 };
1207
1208 static void ieee80211_if_free(struct net_device *dev)
1209 {
1210         free_percpu(dev->tstats);
1211 }
1212
1213 static void ieee80211_if_setup(struct net_device *dev)
1214 {
1215         ether_setup(dev);
1216         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1217         dev->netdev_ops = &ieee80211_dataif_ops;
1218         dev->needs_free_netdev = true;
1219         dev->priv_destructor = ieee80211_if_free;
1220 }
1221
1222 static void ieee80211_if_setup_no_queue(struct net_device *dev)
1223 {
1224         ieee80211_if_setup(dev);
1225         dev->features |= NETIF_F_LLTX;
1226         dev->priv_flags |= IFF_NO_QUEUE;
1227 }
1228
1229 static void ieee80211_iface_work(struct work_struct *work)
1230 {
1231         struct ieee80211_sub_if_data *sdata =
1232                 container_of(work, struct ieee80211_sub_if_data, work);
1233         struct ieee80211_local *local = sdata->local;
1234         struct sk_buff *skb;
1235         struct sta_info *sta;
1236
1237         if (!ieee80211_sdata_running(sdata))
1238                 return;
1239
1240         if (test_bit(SCAN_SW_SCANNING, &local->scanning))
1241                 return;
1242
1243         if (!ieee80211_can_run_worker(local))
1244                 return;
1245
1246         /* first process frames */
1247         while ((skb = skb_dequeue(&sdata->skb_queue))) {
1248                 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1249
1250                 if (ieee80211_is_action(mgmt->frame_control) &&
1251                     mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1252                         int len = skb->len;
1253
1254                         mutex_lock(&local->sta_mtx);
1255                         sta = sta_info_get_bss(sdata, mgmt->sa);
1256                         if (sta) {
1257                                 switch (mgmt->u.action.u.addba_req.action_code) {
1258                                 case WLAN_ACTION_ADDBA_REQ:
1259                                         ieee80211_process_addba_request(
1260                                                         local, sta, mgmt, len);
1261                                         break;
1262                                 case WLAN_ACTION_ADDBA_RESP:
1263                                         ieee80211_process_addba_resp(local, sta,
1264                                                                      mgmt, len);
1265                                         break;
1266                                 case WLAN_ACTION_DELBA:
1267                                         ieee80211_process_delba(sdata, sta,
1268                                                                 mgmt, len);
1269                                         break;
1270                                 default:
1271                                         WARN_ON(1);
1272                                         break;
1273                                 }
1274                         }
1275                         mutex_unlock(&local->sta_mtx);
1276                 } else if (ieee80211_is_action(mgmt->frame_control) &&
1277                            mgmt->u.action.category == WLAN_CATEGORY_VHT) {
1278                         switch (mgmt->u.action.u.vht_group_notif.action_code) {
1279                         case WLAN_VHT_ACTION_OPMODE_NOTIF: {
1280                                 struct ieee80211_rx_status *status;
1281                                 enum nl80211_band band;
1282                                 u8 opmode;
1283
1284                                 status = IEEE80211_SKB_RXCB(skb);
1285                                 band = status->band;
1286                                 opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
1287
1288                                 mutex_lock(&local->sta_mtx);
1289                                 sta = sta_info_get_bss(sdata, mgmt->sa);
1290
1291                                 if (sta)
1292                                         ieee80211_vht_handle_opmode(sdata, sta,
1293                                                                     opmode,
1294                                                                     band);
1295
1296                                 mutex_unlock(&local->sta_mtx);
1297                                 break;
1298                         }
1299                         case WLAN_VHT_ACTION_GROUPID_MGMT:
1300                                 ieee80211_process_mu_groups(sdata, mgmt);
1301                                 break;
1302                         default:
1303                                 WARN_ON(1);
1304                                 break;
1305                         }
1306                 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1307                         struct ieee80211_hdr *hdr = (void *)mgmt;
1308                         /*
1309                          * So the frame isn't mgmt, but frame_control
1310                          * is at the right place anyway, of course, so
1311                          * the if statement is correct.
1312                          *
1313                          * Warn if we have other data frame types here,
1314                          * they must not get here.
1315                          */
1316                         WARN_ON(hdr->frame_control &
1317                                         cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1318                         WARN_ON(!(hdr->seq_ctrl &
1319                                         cpu_to_le16(IEEE80211_SCTL_FRAG)));
1320                         /*
1321                          * This was a fragment of a frame, received while
1322                          * a block-ack session was active. That cannot be
1323                          * right, so terminate the session.
1324                          */
1325                         mutex_lock(&local->sta_mtx);
1326                         sta = sta_info_get_bss(sdata, mgmt->sa);
1327                         if (sta) {
1328                                 u16 tid = ieee80211_get_tid(hdr);
1329
1330                                 __ieee80211_stop_rx_ba_session(
1331                                         sta, tid, WLAN_BACK_RECIPIENT,
1332                                         WLAN_REASON_QSTA_REQUIRE_SETUP,
1333                                         true);
1334                         }
1335                         mutex_unlock(&local->sta_mtx);
1336                 } else switch (sdata->vif.type) {
1337                 case NL80211_IFTYPE_STATION:
1338                         ieee80211_sta_rx_queued_mgmt(sdata, skb);
1339                         break;
1340                 case NL80211_IFTYPE_ADHOC:
1341                         ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1342                         break;
1343                 case NL80211_IFTYPE_MESH_POINT:
1344                         if (!ieee80211_vif_is_mesh(&sdata->vif))
1345                                 break;
1346                         ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1347                         break;
1348                 default:
1349                         WARN(1, "frame for unexpected interface type");
1350                         break;
1351                 }
1352
1353                 kfree_skb(skb);
1354         }
1355
1356         /* then other type-dependent work */
1357         switch (sdata->vif.type) {
1358         case NL80211_IFTYPE_STATION:
1359                 ieee80211_sta_work(sdata);
1360                 break;
1361         case NL80211_IFTYPE_ADHOC:
1362                 ieee80211_ibss_work(sdata);
1363                 break;
1364         case NL80211_IFTYPE_MESH_POINT:
1365                 if (!ieee80211_vif_is_mesh(&sdata->vif))
1366                         break;
1367                 ieee80211_mesh_work(sdata);
1368                 break;
1369         case NL80211_IFTYPE_OCB:
1370                 ieee80211_ocb_work(sdata);
1371                 break;
1372         default:
1373                 break;
1374         }
1375 }
1376
1377 static void ieee80211_recalc_smps_work(struct work_struct *work)
1378 {
1379         struct ieee80211_sub_if_data *sdata =
1380                 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1381
1382         ieee80211_recalc_smps(sdata);
1383 }
1384
1385 /*
1386  * Helper function to initialise an interface to a specific type.
1387  */
1388 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1389                                   enum nl80211_iftype type)
1390 {
1391         static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff,
1392                                                     0xff, 0xff, 0xff};
1393
1394         /* clear type-dependent union */
1395         memset(&sdata->u, 0, sizeof(sdata->u));
1396
1397         /* and set some type-dependent values */
1398         sdata->vif.type = type;
1399         sdata->vif.p2p = false;
1400         sdata->wdev.iftype = type;
1401
1402         sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1403         sdata->control_port_no_encrypt = false;
1404         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1405         sdata->vif.bss_conf.idle = true;
1406
1407         sdata->noack_map = 0;
1408
1409         /* only monitor/p2p-device differ */
1410         if (sdata->dev) {
1411                 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1412                 sdata->dev->type = ARPHRD_ETHER;
1413         }
1414
1415         skb_queue_head_init(&sdata->skb_queue);
1416         INIT_WORK(&sdata->work, ieee80211_iface_work);
1417         INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1418         INIT_WORK(&sdata->csa_finalize_work, ieee80211_csa_finalize_work);
1419         INIT_LIST_HEAD(&sdata->assigned_chanctx_list);
1420         INIT_LIST_HEAD(&sdata->reserved_chanctx_list);
1421
1422         switch (type) {
1423         case NL80211_IFTYPE_P2P_GO:
1424                 type = NL80211_IFTYPE_AP;
1425                 sdata->vif.type = type;
1426                 sdata->vif.p2p = true;
1427                 /* fall through */
1428         case NL80211_IFTYPE_AP:
1429                 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1430                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1431                 INIT_WORK(&sdata->u.ap.request_smps_work,
1432                           ieee80211_request_smps_ap_work);
1433                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1434                 sdata->u.ap.req_smps = IEEE80211_SMPS_OFF;
1435                 break;
1436         case NL80211_IFTYPE_P2P_CLIENT:
1437                 type = NL80211_IFTYPE_STATION;
1438                 sdata->vif.type = type;
1439                 sdata->vif.p2p = true;
1440                 /* fall through */
1441         case NL80211_IFTYPE_STATION:
1442                 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1443                 ieee80211_sta_setup_sdata(sdata);
1444                 break;
1445         case NL80211_IFTYPE_OCB:
1446                 sdata->vif.bss_conf.bssid = bssid_wildcard;
1447                 ieee80211_ocb_setup_sdata(sdata);
1448                 break;
1449         case NL80211_IFTYPE_ADHOC:
1450                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1451                 ieee80211_ibss_setup_sdata(sdata);
1452                 break;
1453         case NL80211_IFTYPE_MESH_POINT:
1454                 if (ieee80211_vif_is_mesh(&sdata->vif))
1455                         ieee80211_mesh_init_sdata(sdata);
1456                 break;
1457         case NL80211_IFTYPE_MONITOR:
1458                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1459                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1460                 sdata->u.mntr.flags = MONITOR_FLAG_CONTROL |
1461                                       MONITOR_FLAG_OTHER_BSS;
1462                 break;
1463         case NL80211_IFTYPE_WDS:
1464                 sdata->vif.bss_conf.bssid = NULL;
1465                 break;
1466         case NL80211_IFTYPE_NAN:
1467                 idr_init(&sdata->u.nan.function_inst_ids);
1468                 spin_lock_init(&sdata->u.nan.func_lock);
1469                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1470                 break;
1471         case NL80211_IFTYPE_AP_VLAN:
1472         case NL80211_IFTYPE_P2P_DEVICE:
1473                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1474                 break;
1475         case NL80211_IFTYPE_UNSPECIFIED:
1476         case NUM_NL80211_IFTYPES:
1477                 WARN_ON(1);
1478                 break;
1479         }
1480
1481         ieee80211_debugfs_add_netdev(sdata);
1482 }
1483
1484 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1485                                            enum nl80211_iftype type)
1486 {
1487         struct ieee80211_local *local = sdata->local;
1488         int ret, err;
1489         enum nl80211_iftype internal_type = type;
1490         bool p2p = false;
1491
1492         ASSERT_RTNL();
1493
1494         if (!local->ops->change_interface)
1495                 return -EBUSY;
1496
1497         switch (sdata->vif.type) {
1498         case NL80211_IFTYPE_AP:
1499         case NL80211_IFTYPE_STATION:
1500         case NL80211_IFTYPE_ADHOC:
1501         case NL80211_IFTYPE_OCB:
1502                 /*
1503                  * Could maybe also all others here?
1504                  * Just not sure how that interacts
1505                  * with the RX/config path e.g. for
1506                  * mesh.
1507                  */
1508                 break;
1509         default:
1510                 return -EBUSY;
1511         }
1512
1513         switch (type) {
1514         case NL80211_IFTYPE_AP:
1515         case NL80211_IFTYPE_STATION:
1516         case NL80211_IFTYPE_ADHOC:
1517         case NL80211_IFTYPE_OCB:
1518                 /*
1519                  * Could probably support everything
1520                  * but WDS here (WDS do_open can fail
1521                  * under memory pressure, which this
1522                  * code isn't prepared to handle).
1523                  */
1524                 break;
1525         case NL80211_IFTYPE_P2P_CLIENT:
1526                 p2p = true;
1527                 internal_type = NL80211_IFTYPE_STATION;
1528                 break;
1529         case NL80211_IFTYPE_P2P_GO:
1530                 p2p = true;
1531                 internal_type = NL80211_IFTYPE_AP;
1532                 break;
1533         default:
1534                 return -EBUSY;
1535         }
1536
1537         ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1538         if (ret)
1539                 return ret;
1540
1541         ieee80211_do_stop(sdata, false);
1542
1543         ieee80211_teardown_sdata(sdata);
1544
1545         ret = drv_change_interface(local, sdata, internal_type, p2p);
1546         if (ret)
1547                 type = ieee80211_vif_type_p2p(&sdata->vif);
1548
1549         /*
1550          * Ignore return value here, there's not much we can do since
1551          * the driver changed the interface type internally already.
1552          * The warnings will hopefully make driver authors fix it :-)
1553          */
1554         ieee80211_check_queues(sdata, type);
1555
1556         ieee80211_setup_sdata(sdata, type);
1557
1558         err = ieee80211_do_open(&sdata->wdev, false);
1559         WARN(err, "type change: do_open returned %d", err);
1560
1561         return ret;
1562 }
1563
1564 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1565                              enum nl80211_iftype type)
1566 {
1567         int ret;
1568
1569         ASSERT_RTNL();
1570
1571         if (type == ieee80211_vif_type_p2p(&sdata->vif))
1572                 return 0;
1573
1574         if (ieee80211_sdata_running(sdata)) {
1575                 ret = ieee80211_runtime_change_iftype(sdata, type);
1576                 if (ret)
1577                         return ret;
1578         } else {
1579                 /* Purge and reset type-dependent state. */
1580                 ieee80211_teardown_sdata(sdata);
1581                 ieee80211_setup_sdata(sdata, type);
1582         }
1583
1584         /* reset some values that shouldn't be kept across type changes */
1585         if (type == NL80211_IFTYPE_STATION)
1586                 sdata->u.mgd.use_4addr = false;
1587
1588         return 0;
1589 }
1590
1591 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1592                                        u8 *perm_addr, enum nl80211_iftype type)
1593 {
1594         struct ieee80211_sub_if_data *sdata;
1595         u64 mask, start, addr, val, inc;
1596         u8 *m;
1597         u8 tmp_addr[ETH_ALEN];
1598         int i;
1599
1600         /* default ... something at least */
1601         memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1602
1603         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1604             local->hw.wiphy->n_addresses <= 1)
1605                 return;
1606
1607         mutex_lock(&local->iflist_mtx);
1608
1609         switch (type) {
1610         case NL80211_IFTYPE_MONITOR:
1611                 /* doesn't matter */
1612                 break;
1613         case NL80211_IFTYPE_WDS:
1614         case NL80211_IFTYPE_AP_VLAN:
1615                 /* match up with an AP interface */
1616                 list_for_each_entry(sdata, &local->interfaces, list) {
1617                         if (sdata->vif.type != NL80211_IFTYPE_AP)
1618                                 continue;
1619                         memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1620                         break;
1621                 }
1622                 /* keep default if no AP interface present */
1623                 break;
1624         case NL80211_IFTYPE_P2P_CLIENT:
1625         case NL80211_IFTYPE_P2P_GO:
1626                 if (ieee80211_hw_check(&local->hw, P2P_DEV_ADDR_FOR_INTF)) {
1627                         list_for_each_entry(sdata, &local->interfaces, list) {
1628                                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1629                                         continue;
1630                                 if (!ieee80211_sdata_running(sdata))
1631                                         continue;
1632                                 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1633                                 goto out_unlock;
1634                         }
1635                 }
1636                 /* fall through */
1637         default:
1638                 /* assign a new address if possible -- try n_addresses first */
1639                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1640                         bool used = false;
1641
1642                         list_for_each_entry(sdata, &local->interfaces, list) {
1643                                 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr,
1644                                                      sdata->vif.addr)) {
1645                                         used = true;
1646                                         break;
1647                                 }
1648                         }
1649
1650                         if (!used) {
1651                                 memcpy(perm_addr,
1652                                        local->hw.wiphy->addresses[i].addr,
1653                                        ETH_ALEN);
1654                                 break;
1655                         }
1656                 }
1657
1658                 /* try mask if available */
1659                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1660                         break;
1661
1662                 m = local->hw.wiphy->addr_mask;
1663                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1664                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1665                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1666
1667                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1668                         /* not a contiguous mask ... not handled now! */
1669                         pr_info("not contiguous\n");
1670                         break;
1671                 }
1672
1673                 /*
1674                  * Pick address of existing interface in case user changed
1675                  * MAC address manually, default to perm_addr.
1676                  */
1677                 m = local->hw.wiphy->perm_addr;
1678                 list_for_each_entry(sdata, &local->interfaces, list) {
1679                         if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
1680                                 continue;
1681                         m = sdata->vif.addr;
1682                         break;
1683                 }
1684                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1685                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1686                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1687
1688                 inc = 1ULL<<__ffs64(mask);
1689                 val = (start & mask);
1690                 addr = (start & ~mask) | (val & mask);
1691                 do {
1692                         bool used = false;
1693
1694                         tmp_addr[5] = addr >> 0*8;
1695                         tmp_addr[4] = addr >> 1*8;
1696                         tmp_addr[3] = addr >> 2*8;
1697                         tmp_addr[2] = addr >> 3*8;
1698                         tmp_addr[1] = addr >> 4*8;
1699                         tmp_addr[0] = addr >> 5*8;
1700
1701                         val += inc;
1702
1703                         list_for_each_entry(sdata, &local->interfaces, list) {
1704                                 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) {
1705                                         used = true;
1706                                         break;
1707                                 }
1708                         }
1709
1710                         if (!used) {
1711                                 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1712                                 break;
1713                         }
1714                         addr = (start & ~mask) | (val & mask);
1715                 } while (addr != start);
1716
1717                 break;
1718         }
1719
1720  out_unlock:
1721         mutex_unlock(&local->iflist_mtx);
1722 }
1723
1724 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1725                      unsigned char name_assign_type,
1726                      struct wireless_dev **new_wdev, enum nl80211_iftype type,
1727                      struct vif_params *params)
1728 {
1729         struct net_device *ndev = NULL;
1730         struct ieee80211_sub_if_data *sdata = NULL;
1731         struct txq_info *txqi;
1732         void (*if_setup)(struct net_device *dev);
1733         int ret, i;
1734         int txqs = 1;
1735
1736         ASSERT_RTNL();
1737
1738         if (type == NL80211_IFTYPE_P2P_DEVICE || type == NL80211_IFTYPE_NAN) {
1739                 struct wireless_dev *wdev;
1740
1741                 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1742                                 GFP_KERNEL);
1743                 if (!sdata)
1744                         return -ENOMEM;
1745                 wdev = &sdata->wdev;
1746
1747                 sdata->dev = NULL;
1748                 strlcpy(sdata->name, name, IFNAMSIZ);
1749                 ieee80211_assign_perm_addr(local, wdev->address, type);
1750                 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1751         } else {
1752                 int size = ALIGN(sizeof(*sdata) + local->hw.vif_data_size,
1753                                  sizeof(void *));
1754                 int txq_size = 0;
1755
1756                 if (local->ops->wake_tx_queue &&
1757                     type != NL80211_IFTYPE_AP_VLAN &&
1758                     (type != NL80211_IFTYPE_MONITOR ||
1759                      (params->flags & MONITOR_FLAG_ACTIVE)))
1760                         txq_size += sizeof(struct txq_info) +
1761                                     local->hw.txq_data_size;
1762
1763                 if (local->ops->wake_tx_queue) {
1764                         if_setup = ieee80211_if_setup_no_queue;
1765                 } else {
1766                         if_setup = ieee80211_if_setup;
1767                         if (local->hw.queues >= IEEE80211_NUM_ACS)
1768                                 txqs = IEEE80211_NUM_ACS;
1769                 }
1770
1771                 ndev = alloc_netdev_mqs(size + txq_size,
1772                                         name, name_assign_type,
1773                                         if_setup, txqs, 1);
1774                 if (!ndev)
1775                         return -ENOMEM;
1776                 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1777
1778                 ndev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1779                 if (!ndev->tstats) {
1780                         free_netdev(ndev);
1781                         return -ENOMEM;
1782                 }
1783
1784                 ndev->needed_headroom = local->tx_headroom +
1785                                         4*6 /* four MAC addresses */
1786                                         + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1787                                         + 6 /* mesh */
1788                                         + 8 /* rfc1042/bridge tunnel */
1789                                         - ETH_HLEN /* ethernet hard_header_len */
1790                                         + IEEE80211_ENCRYPT_HEADROOM;
1791                 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1792
1793                 ret = dev_alloc_name(ndev, ndev->name);
1794                 if (ret < 0) {
1795                         ieee80211_if_free(ndev);
1796                         free_netdev(ndev);
1797                         return ret;
1798                 }
1799
1800                 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1801                 if (is_valid_ether_addr(params->macaddr))
1802                         memcpy(ndev->dev_addr, params->macaddr, ETH_ALEN);
1803                 else
1804                         memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1805                 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1806
1807                 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1808                 sdata = netdev_priv(ndev);
1809                 ndev->ieee80211_ptr = &sdata->wdev;
1810                 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1811                 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1812
1813                 if (txq_size) {
1814                         txqi = netdev_priv(ndev) + size;
1815                         ieee80211_txq_init(sdata, NULL, txqi, 0);
1816                 }
1817
1818                 sdata->dev = ndev;
1819         }
1820
1821         /* initialise type-independent data */
1822         sdata->wdev.wiphy = local->hw.wiphy;
1823         sdata->local = local;
1824
1825         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1826                 skb_queue_head_init(&sdata->fragments[i].skb_list);
1827
1828         INIT_LIST_HEAD(&sdata->key_list);
1829
1830         INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
1831                           ieee80211_dfs_cac_timer_work);
1832         INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
1833                           ieee80211_delayed_tailroom_dec);
1834
1835         for (i = 0; i < NUM_NL80211_BANDS; i++) {
1836                 struct ieee80211_supported_band *sband;
1837                 sband = local->hw.wiphy->bands[i];
1838                 sdata->rc_rateidx_mask[i] =
1839                         sband ? (1 << sband->n_bitrates) - 1 : 0;
1840                 if (sband) {
1841                         __le16 cap;
1842                         u16 *vht_rate_mask;
1843
1844                         memcpy(sdata->rc_rateidx_mcs_mask[i],
1845                                sband->ht_cap.mcs.rx_mask,
1846                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1847
1848                         cap = sband->vht_cap.vht_mcs.rx_mcs_map;
1849                         vht_rate_mask = sdata->rc_rateidx_vht_mcs_mask[i];
1850                         ieee80211_get_vht_mask_from_cap(cap, vht_rate_mask);
1851                 } else {
1852                         memset(sdata->rc_rateidx_mcs_mask[i], 0,
1853                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1854                         memset(sdata->rc_rateidx_vht_mcs_mask[i], 0,
1855                                sizeof(sdata->rc_rateidx_vht_mcs_mask[i]));
1856                 }
1857         }
1858
1859         ieee80211_set_default_queues(sdata);
1860
1861         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1862         sdata->user_power_level = local->user_power_level;
1863
1864         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1865
1866         /* setup type-dependent data */
1867         ieee80211_setup_sdata(sdata, type);
1868
1869         if (ndev) {
1870                 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1871                 if (type == NL80211_IFTYPE_STATION)
1872                         sdata->u.mgd.use_4addr = params->use_4addr;
1873
1874                 ndev->features |= local->hw.netdev_features;
1875
1876                 netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops);
1877
1878                 /* MTU range: 256 - 2304 */
1879                 ndev->min_mtu = 256;
1880                 ndev->max_mtu = IEEE80211_MAX_DATA_LEN;
1881
1882                 ret = register_netdevice(ndev);
1883                 if (ret) {
1884                         free_netdev(ndev);
1885                         return ret;
1886                 }
1887         }
1888
1889         mutex_lock(&local->iflist_mtx);
1890         list_add_tail_rcu(&sdata->list, &local->interfaces);
1891         mutex_unlock(&local->iflist_mtx);
1892
1893         if (new_wdev)
1894                 *new_wdev = &sdata->wdev;
1895
1896         return 0;
1897 }
1898
1899 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1900 {
1901         ASSERT_RTNL();
1902
1903         mutex_lock(&sdata->local->iflist_mtx);
1904         list_del_rcu(&sdata->list);
1905         mutex_unlock(&sdata->local->iflist_mtx);
1906
1907         if (sdata->vif.txq)
1908                 ieee80211_txq_purge(sdata->local, to_txq_info(sdata->vif.txq));
1909
1910         synchronize_rcu();
1911
1912         if (sdata->dev) {
1913                 unregister_netdevice(sdata->dev);
1914         } else {
1915                 cfg80211_unregister_wdev(&sdata->wdev);
1916                 ieee80211_teardown_sdata(sdata);
1917                 kfree(sdata);
1918         }
1919 }
1920
1921 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
1922 {
1923         if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
1924                 return;
1925         ieee80211_do_stop(sdata, true);
1926 }
1927
1928 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1929 {
1930         struct ieee80211_sub_if_data *sdata, *tmp;
1931         LIST_HEAD(unreg_list);
1932         LIST_HEAD(wdev_list);
1933
1934         ASSERT_RTNL();
1935
1936         /* Before destroying the interfaces, make sure they're all stopped so
1937          * that the hardware is stopped. Otherwise, the driver might still be
1938          * iterating the interfaces during the shutdown, e.g. from a worker
1939          * or from RX processing or similar, and if it does so (using atomic
1940          * iteration) while we're manipulating the list, the iteration will
1941          * crash.
1942          *
1943          * After this, the hardware should be stopped and the driver should
1944          * have stopped all of its activities, so that we can do RCU-unaware
1945          * manipulations of the interface list below.
1946          */
1947         cfg80211_shutdown_all_interfaces(local->hw.wiphy);
1948
1949         WARN(local->open_count, "%s: open count remains %d\n",
1950              wiphy_name(local->hw.wiphy), local->open_count);
1951
1952         ieee80211_txq_teardown_flows(local);
1953
1954         mutex_lock(&local->iflist_mtx);
1955         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1956                 list_del(&sdata->list);
1957
1958                 if (sdata->dev)
1959                         unregister_netdevice_queue(sdata->dev, &unreg_list);
1960                 else
1961                         list_add(&sdata->list, &wdev_list);
1962         }
1963         mutex_unlock(&local->iflist_mtx);
1964         unregister_netdevice_many(&unreg_list);
1965
1966         list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
1967                 list_del(&sdata->list);
1968                 cfg80211_unregister_wdev(&sdata->wdev);
1969                 kfree(sdata);
1970         }
1971 }
1972
1973 static int netdev_notify(struct notifier_block *nb,
1974                          unsigned long state, void *ptr)
1975 {
1976         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1977         struct ieee80211_sub_if_data *sdata;
1978
1979         if (state != NETDEV_CHANGENAME)
1980                 return NOTIFY_DONE;
1981
1982         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1983                 return NOTIFY_DONE;
1984
1985         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1986                 return NOTIFY_DONE;
1987
1988         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1989         memcpy(sdata->name, dev->name, IFNAMSIZ);
1990         ieee80211_debugfs_rename_netdev(sdata);
1991
1992         return NOTIFY_OK;
1993 }
1994
1995 static struct notifier_block mac80211_netdev_notifier = {
1996         .notifier_call = netdev_notify,
1997 };
1998
1999 int ieee80211_iface_init(void)
2000 {
2001         return register_netdevice_notifier(&mac80211_netdev_notifier);
2002 }
2003
2004 void ieee80211_iface_exit(void)
2005 {
2006         unregister_netdevice_notifier(&mac80211_netdev_notifier);
2007 }
2008
2009 void ieee80211_vif_inc_num_mcast(struct ieee80211_sub_if_data *sdata)
2010 {
2011         if (sdata->vif.type == NL80211_IFTYPE_AP)
2012                 atomic_inc(&sdata->u.ap.num_mcast_sta);
2013         else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2014                 atomic_inc(&sdata->u.vlan.num_mcast_sta);
2015 }
2016
2017 void ieee80211_vif_dec_num_mcast(struct ieee80211_sub_if_data *sdata)
2018 {
2019         if (sdata->vif.type == NL80211_IFTYPE_AP)
2020                 atomic_dec(&sdata->u.ap.num_mcast_sta);
2021         else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2022                 atomic_dec(&sdata->u.vlan.num_mcast_sta);
2023 }