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  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2 as
  12  * published by the Free Software Foundation.
  13  */
  14 #include <linux/slab.h>
  15 #include <linux/kernel.h>
  16 #include <linux/if_arp.h>
  17 #include <linux/netdevice.h>
  18 #include <linux/rtnetlink.h>
  19 #include <net/mac80211.h>
  20 #include <net/ieee80211_radiotap.h>
  21 #include "ieee80211_i.h"
  22 #include "sta_info.h"
  23 #include "debugfs_netdev.h"
  24 #include "mesh.h"
  25 #include "led.h"
  26 #include "driver-ops.h"
  27 #include "wme.h"
  28 #include "rate.h"
  29
  30 /**
  31  * DOC: Interface list locking
  32  *
  33  * The interface list in each struct ieee80211_local is protected
  34  * three-fold:
  35  *
  36  * (1) modifications may only be done under the RTNL
  37  * (2) modifications and readers are protected against each other by
  38  *     the iflist_mtx.
  39  * (3) modifications are done in an RCU manner so atomic readers
  40  *     can traverse the list in RCU-safe blocks.
  41  *
  42  * As a consequence, reads (traversals) of the list can be protected
  43  * by either the RTNL, the iflist_mtx or RCU.
  44  */
  45
  46 static void ieee80211_iface_work(struct work_struct *work);
  47
  48 bool __ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
  49 {
  50         struct ieee80211_chanctx_conf *chanctx_conf;
  51         int power;
  52
  53         rcu_read_lock();
  54         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
  55         if (!chanctx_conf) {
  56                 rcu_read_unlock();
  57                 return false;
  58         }
  59
  60         power = ieee80211_chandef_max_power(&chanctx_conf->def);
  61         rcu_read_unlock();
  62
  63         if (sdata->user_power_level != IEEE80211_UNSET_POWER_LEVEL)
  64                 power = min(power, sdata->user_power_level);
  65
  66         if (sdata->ap_power_level != IEEE80211_UNSET_POWER_LEVEL)
  67                 power = min(power, sdata->ap_power_level);
  68
  69         if (power != sdata->vif.bss_conf.txpower) {
  70                 sdata->vif.bss_conf.txpower = power;
  71                 ieee80211_hw_config(sdata->local, 0);
  72                 return true;
  73         }
  74
  75         return false;
  76 }
  77
  78 void ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata,
  79                               bool update_bss)
  80 {
  81         if (__ieee80211_recalc_txpower(sdata) ||
  82             (update_bss && ieee80211_sdata_running(sdata)))
  83                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_TXPOWER);
  84 }
  85
  86 static u32 __ieee80211_idle_off(struct ieee80211_local *local)
  87 {
  88         if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
  89                 return 0;
  90
  91         local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
  92         return IEEE80211_CONF_CHANGE_IDLE;
  93 }
  94
  95 static u32 __ieee80211_idle_on(struct ieee80211_local *local)
  96 {
  97         if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
  98                 return 0;
  99
 100         ieee80211_flush_queues(local, NULL, false);
 101
 102         local->hw.conf.flags |= IEEE80211_CONF_IDLE;
 103         return IEEE80211_CONF_CHANGE_IDLE;
 104 }
 105
 106 static u32 __ieee80211_recalc_idle(struct ieee80211_local *local,
 107                                    bool force_active)
 108 {
 109         bool working, scanning, active;
 110         unsigned int led_trig_start = 0, led_trig_stop = 0;
 111
 112         lockdep_assert_held(&local->mtx);
 113
 114         active = force_active ||
 115                  !list_empty(&local->chanctx_list) ||
 116                  local->monitors;
 117
 118         working = !local->ops->remain_on_channel &&
 119                   !list_empty(&local->roc_list);
 120
 121         scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) ||
 122                    test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning);
 123
 124         if (working || scanning)
 125                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
 126         else
 127                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
 128
 129         if (active)
 130                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
 131         else
 132                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
 133
 134         ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
 135
 136         if (working || scanning || active)
 137                 return __ieee80211_idle_off(local);
 138         return __ieee80211_idle_on(local);
 139 }
 140
 141 u32 ieee80211_idle_off(struct ieee80211_local *local)
 142 {
 143         return __ieee80211_recalc_idle(local, true);
 144 }
 145
 146 void ieee80211_recalc_idle(struct ieee80211_local *local)
 147 {
 148         u32 change = __ieee80211_recalc_idle(local, false);
 149         if (change)
 150                 ieee80211_hw_config(local, change);
 151 }
 152
 153 static int ieee80211_verify_mac(struct ieee80211_sub_if_data *sdata, u8 *addr,
 154                                 bool check_dup)
 155 {
 156         struct ieee80211_local *local = sdata->local;
 157         struct ieee80211_sub_if_data *iter;
 158         u64 new, mask, tmp;
 159         u8 *m;
 160         int ret = 0;
 161
 162         if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
 163                 return 0;
 164
 165         m = addr;
 166         new =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 167                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 168                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 169
 170         m = local->hw.wiphy->addr_mask;
 171         mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 172                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 173                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 174
 175         if (!check_dup)
 176                 return ret;
 177
 178         mutex_lock(&local->iflist_mtx);
 179         list_for_each_entry(iter, &local->interfaces, list) {
 180                 if (iter == sdata)
 181                         continue;
 182
 183                 if (iter->vif.type == NL80211_IFTYPE_MONITOR &&
 184                     !(iter->u.mntr.flags & MONITOR_FLAG_ACTIVE))
 185                         continue;
 186
 187                 m = iter->vif.addr;
 188                 tmp =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 189                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 190                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 191
 192                 if ((new & ~mask) != (tmp & ~mask)) {
 193                         ret = -EINVAL;
 194                         break;
 195                 }
 196         }
 197         mutex_unlock(&local->iflist_mtx);
 198
 199         return ret;
 200 }
 201
 202 static int ieee80211_change_mac(struct net_device *dev, void *addr)
 203 {
 204         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 205         struct sockaddr *sa = addr;
 206         bool check_dup = true;
 207         int ret;
 208
 209         if (ieee80211_sdata_running(sdata))
 210                 return -EBUSY;
 211
 212         if (sdata->vif.type == NL80211_IFTYPE_MONITOR &&
 213             !(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
 214                 check_dup = false;
 215
 216         ret = ieee80211_verify_mac(sdata, sa->sa_data, check_dup);
 217         if (ret)
 218                 return ret;
 219
 220         ret = eth_mac_addr(dev, sa);
 221
 222         if (ret == 0)
 223                 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
 224
 225         return ret;
 226 }
 227
 228 static inline int identical_mac_addr_allowed(int type1, int type2)
 229 {
 230         return type1 == NL80211_IFTYPE_MONITOR ||
 231                 type2 == NL80211_IFTYPE_MONITOR ||
 232                 type1 == NL80211_IFTYPE_P2P_DEVICE ||
 233                 type2 == NL80211_IFTYPE_P2P_DEVICE ||
 234                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
 235                 (type1 == NL80211_IFTYPE_WDS &&
 236                         (type2 == NL80211_IFTYPE_WDS ||
 237                          type2 == NL80211_IFTYPE_AP)) ||
 238                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
 239                 (type1 == NL80211_IFTYPE_AP_VLAN &&
 240                         (type2 == NL80211_IFTYPE_AP ||
 241                          type2 == NL80211_IFTYPE_AP_VLAN));
 242 }
 243
 244 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
 245                                             enum nl80211_iftype iftype)
 246 {
 247         struct ieee80211_local *local = sdata->local;
 248         struct ieee80211_sub_if_data *nsdata;
 249         int ret;
 250
 251         ASSERT_RTNL();
 252
 253         /* we hold the RTNL here so can safely walk the list */
 254         list_for_each_entry(nsdata, &local->interfaces, list) {
 255                 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
 256                         /*
 257                          * Only OCB and monitor mode may coexist
 258                          */
 259                         if ((sdata->vif.type == NL80211_IFTYPE_OCB &&
 260                              nsdata->vif.type != NL80211_IFTYPE_MONITOR) ||
 261                             (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
 262                              nsdata->vif.type == NL80211_IFTYPE_OCB))
 263                                 return -EBUSY;
 264
 265                         /*
 266                          * Allow only a single IBSS interface to be up at any
 267                          * time. This is restricted because beacon distribution
 268                          * cannot work properly if both are in the same IBSS.
 269                          *
 270                          * To remove this restriction we'd have to disallow them
 271                          * from setting the same SSID on different IBSS interfaces
 272                          * belonging to the same hardware. Then, however, we're
 273                          * faced with having to adopt two different TSF timers...
 274                          */
 275                         if (iftype == NL80211_IFTYPE_ADHOC &&
 276                             nsdata->vif.type == NL80211_IFTYPE_ADHOC)
 277                                 return -EBUSY;
 278                         /*
 279                          * will not add another interface while any channel
 280                          * switch is active.
 281                          */
 282                         if (nsdata->vif.csa_active)
 283                                 return -EBUSY;
 284
 285                         /*
 286                          * The remaining checks are only performed for interfaces
 287                          * with the same MAC address.
 288                          */
 289                         if (!ether_addr_equal(sdata->vif.addr,
 290                                               nsdata->vif.addr))
 291                                 continue;
 292
 293                         /*
 294                          * check whether it may have the same address
 295                          */
 296                         if (!identical_mac_addr_allowed(iftype,
 297                                                         nsdata->vif.type))
 298                                 return -ENOTUNIQ;
 299
 300                         /*
 301                          * can only add VLANs to enabled APs
 302                          */
 303                         if (iftype == NL80211_IFTYPE_AP_VLAN &&
 304                             nsdata->vif.type == NL80211_IFTYPE_AP)
 305                                 sdata->bss = &nsdata->u.ap;
 306                 }
 307         }
 308
 309         mutex_lock(&local->chanctx_mtx);
 310         ret = ieee80211_check_combinations(sdata, NULL, 0, 0);
 311         mutex_unlock(&local->chanctx_mtx);
 312         return ret;
 313 }
 314
 315 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata,
 316                                   enum nl80211_iftype iftype)
 317 {
 318         int n_queues = sdata->local->hw.queues;
 319         int i;
 320
 321         if (iftype == NL80211_IFTYPE_NAN)
 322                 return 0;
 323
 324         if (iftype != NL80211_IFTYPE_P2P_DEVICE) {
 325                 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 326                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
 327                                          IEEE80211_INVAL_HW_QUEUE))
 328                                 return -EINVAL;
 329                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
 330                                          n_queues))
 331                                 return -EINVAL;
 332                 }
 333         }
 334
 335         if ((iftype != NL80211_IFTYPE_AP &&
 336              iftype != NL80211_IFTYPE_P2P_GO &&
 337              iftype != NL80211_IFTYPE_MESH_POINT) ||
 338             !ieee80211_hw_check(&sdata->local->hw, QUEUE_CONTROL)) {
 339                 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
 340                 return 0;
 341         }
 342
 343         if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
 344                 return -EINVAL;
 345
 346         if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
 347                 return -EINVAL;
 348
 349         return 0;
 350 }
 351
 352 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
 353                                     const int offset)
 354 {
 355         struct ieee80211_local *local = sdata->local;
 356         u32 flags = sdata->u.mntr.flags;
 357
 358 #define ADJUST(_f, _s)  do {                                    \
 359         if (flags & MONITOR_FLAG_##_f)                          \
 360                 local->fif_##_s += offset;                      \
 361         } while (0)
 362
 363         ADJUST(FCSFAIL, fcsfail);
 364         ADJUST(PLCPFAIL, plcpfail);
 365         ADJUST(CONTROL, control);
 366         ADJUST(CONTROL, pspoll);
 367         ADJUST(OTHER_BSS, other_bss);
 368
 369 #undef ADJUST
 370 }
 371
 372 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
 373 {
 374         struct ieee80211_local *local = sdata->local;
 375         int i;
 376
 377         for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 378                 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
 379                         sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
 380                 else if (local->hw.queues >= IEEE80211_NUM_ACS)
 381                         sdata->vif.hw_queue[i] = i;
 382                 else
 383                         sdata->vif.hw_queue[i] = 0;
 384         }
 385         sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
 386 }
 387
 388 int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
 389 {
 390         struct ieee80211_sub_if_data *sdata;
 391         int ret;
 392
 393         if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
 394                 return 0;
 395
 396         ASSERT_RTNL();
 397
 398         if (local->monitor_sdata)
 399                 return 0;
 400
 401         sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
 402         if (!sdata)
 403                 return -ENOMEM;
 404
 405         /* set up data */
 406         sdata->local = local;
 407         sdata->vif.type = NL80211_IFTYPE_MONITOR;
 408         snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
 409                  wiphy_name(local->hw.wiphy));
 410         sdata->wdev.iftype = NL80211_IFTYPE_MONITOR;
 411
 412         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
 413
 414         ieee80211_set_default_queues(sdata);
 415
 416         ret = drv_add_interface(local, sdata);
 417         if (WARN_ON(ret)) {
 418                 /* ok .. stupid driver, it asked for this! */
 419                 kfree(sdata);
 420                 return ret;
 421         }
 422
 423         ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR);
 424         if (ret) {
 425                 kfree(sdata);
 426                 return ret;
 427         }
 428
 429         mutex_lock(&local->iflist_mtx);
 430         rcu_assign_pointer(local->monitor_sdata, sdata);
 431         mutex_unlock(&local->iflist_mtx);
 432
 433         mutex_lock(&local->mtx);
 434         ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef,
 435                                         IEEE80211_CHANCTX_EXCLUSIVE);
 436         mutex_unlock(&local->mtx);
 437         if (ret) {
 438                 mutex_lock(&local->iflist_mtx);
 439                 RCU_INIT_POINTER(local->monitor_sdata, NULL);
 440                 mutex_unlock(&local->iflist_mtx);
 441                 synchronize_net();
 442                 drv_remove_interface(local, sdata);
 443                 kfree(sdata);
 444                 return ret;
 445         }
 446
 447         skb_queue_head_init(&sdata->skb_queue);
 448         INIT_WORK(&sdata->work, ieee80211_iface_work);
 449
 450         return 0;
 451 }
 452
 453 void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
 454 {
 455         struct ieee80211_sub_if_data *sdata;
 456
 457         if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
 458                 return;
 459
 460         ASSERT_RTNL();
 461
 462         mutex_lock(&local->iflist_mtx);
 463
 464         sdata = rcu_dereference_protected(local->monitor_sdata,
 465                                           lockdep_is_held(&local->iflist_mtx));
 466         if (!sdata) {
 467                 mutex_unlock(&local->iflist_mtx);
 468                 return;
 469         }
 470
 471         RCU_INIT_POINTER(local->monitor_sdata, NULL);
 472         mutex_unlock(&local->iflist_mtx);
 473
 474         synchronize_net();
 475
 476         mutex_lock(&local->mtx);
 477         ieee80211_vif_release_channel(sdata);
 478         mutex_unlock(&local->mtx);
 479
 480         drv_remove_interface(local, sdata);
 481
 482         kfree(sdata);
 483 }
 484
 485 /*
 486  * NOTE: Be very careful when changing this function, it must NOT return
 487  * an error on interface type changes that have been pre-checked, so most
 488  * checks should be in ieee80211_check_concurrent_iface.
 489  */
 490 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
 491 {
 492         struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
 493         struct net_device *dev = wdev->netdev;
 494         struct ieee80211_local *local = sdata->local;
 495         struct sta_info *sta;
 496         u32 changed = 0;
 497         int res;
 498         u32 hw_reconf_flags = 0;
 499
 500         switch (sdata->vif.type) {
 501         case NL80211_IFTYPE_WDS:
 502                 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
 503                         return -ENOLINK;
 504                 break;
 505         case NL80211_IFTYPE_AP_VLAN: {
 506                 struct ieee80211_sub_if_data *master;
 507
 508                 if (!sdata->bss)
 509                         return -ENOLINK;
 510
 511                 mutex_lock(&local->mtx);
 512                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
 513                 mutex_unlock(&local->mtx);
 514
 515                 master = container_of(sdata->bss,
 516                                       struct ieee80211_sub_if_data, u.ap);
 517                 sdata->control_port_protocol =
 518                         master->control_port_protocol;
 519                 sdata->control_port_no_encrypt =
 520                         master->control_port_no_encrypt;
 521                 sdata->vif.cab_queue = master->vif.cab_queue;
 522                 memcpy(sdata->vif.hw_queue, master->vif.hw_queue,
 523                        sizeof(sdata->vif.hw_queue));
 524                 sdata->vif.bss_conf.chandef = master->vif.bss_conf.chandef;
 525
 526                 mutex_lock(&local->key_mtx);
 527                 sdata->crypto_tx_tailroom_needed_cnt +=
 528                         master->crypto_tx_tailroom_needed_cnt;
 529                 mutex_unlock(&local->key_mtx);
 530
 531                 break;
 532                 }
 533         case NL80211_IFTYPE_AP:
 534                 sdata->bss = &sdata->u.ap;
 535                 break;
 536         case NL80211_IFTYPE_MESH_POINT:
 537         case NL80211_IFTYPE_STATION:
 538         case NL80211_IFTYPE_MONITOR:
 539         case NL80211_IFTYPE_ADHOC:
 540         case NL80211_IFTYPE_P2P_DEVICE:
 541         case NL80211_IFTYPE_OCB:
 542         case NL80211_IFTYPE_NAN:
 543                 /* no special treatment */
 544                 break;
 545         case NL80211_IFTYPE_UNSPECIFIED:
 546         case NUM_NL80211_IFTYPES:
 547         case NL80211_IFTYPE_P2P_CLIENT:
 548         case NL80211_IFTYPE_P2P_GO:
 549                 /* cannot happen */
 550                 WARN_ON(1);
 551                 break;
 552         }
 553
 554         if (local->open_count == 0) {
 555                 res = drv_start(local);
 556                 if (res)
 557                         goto err_del_bss;
 558                 /* we're brought up, everything changes */
 559                 hw_reconf_flags = ~0;
 560                 ieee80211_led_radio(local, true);
 561                 ieee80211_mod_tpt_led_trig(local,
 562                                            IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
 563         }
 564
 565         /*
 566          * Copy the hopefully now-present MAC address to
 567          * this interface, if it has the special null one.
 568          */
 569         if (dev && is_zero_ether_addr(dev->dev_addr)) {
 570                 memcpy(dev->dev_addr,
 571                        local->hw.wiphy->perm_addr,
 572                        ETH_ALEN);
 573                 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
 574
 575                 if (!is_valid_ether_addr(dev->dev_addr)) {
 576                         res = -EADDRNOTAVAIL;
 577                         goto err_stop;
 578                 }
 579         }
 580
 581         switch (sdata->vif.type) {
 582         case NL80211_IFTYPE_AP_VLAN:
 583                 /* no need to tell driver, but set carrier and chanctx */
 584                 if (rtnl_dereference(sdata->bss->beacon)) {
 585                         ieee80211_vif_vlan_copy_chanctx(sdata);
 586                         netif_carrier_on(dev);
 587                 } else {
 588                         netif_carrier_off(dev);
 589                 }
 590                 break;
 591         case NL80211_IFTYPE_MONITOR:
 592                 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
 593                         local->cooked_mntrs++;
 594                         break;
 595                 }
 596
 597                 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) {
 598                         res = drv_add_interface(local, sdata);
 599                         if (res)
 600                                 goto err_stop;
 601                 } else if (local->monitors == 0 && local->open_count == 0) {
 602                         res = ieee80211_add_virtual_monitor(local);
 603                         if (res)
 604                                 goto err_stop;
 605                 }
 606
 607                 /* must be before the call to ieee80211_configure_filter */
 608                 local->monitors++;
 609                 if (local->monitors == 1) {
 610                         local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
 611                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 612                 }
 613
 614                 ieee80211_adjust_monitor_flags(sdata, 1);
 615                 ieee80211_configure_filter(local);
 616                 mutex_lock(&local->mtx);
 617                 ieee80211_recalc_idle(local);
 618                 mutex_unlock(&local->mtx);
 619
 620                 netif_carrier_on(dev);
 621                 break;
 622         default:
 623                 if (coming_up) {
 624                         ieee80211_del_virtual_monitor(local);
 625
 626                         res = drv_add_interface(local, sdata);
 627                         if (res)
 628                                 goto err_stop;
 629                         res = ieee80211_check_queues(sdata,
 630                                 ieee80211_vif_type_p2p(&sdata->vif));
 631                         if (res)
 632                                 goto err_del_interface;
 633                 }
 634
 635                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
 636                         local->fif_pspoll++;
 637                         local->fif_probe_req++;
 638
 639                         ieee80211_configure_filter(local);
 640                 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 641                         local->fif_probe_req++;
 642                 }
 643
 644                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE &&
 645                     sdata->vif.type != NL80211_IFTYPE_NAN)
 646                         changed |= ieee80211_reset_erp_info(sdata);
 647                 ieee80211_bss_info_change_notify(sdata, changed);
 648
 649                 switch (sdata->vif.type) {
 650                 case NL80211_IFTYPE_STATION:
 651                 case NL80211_IFTYPE_ADHOC:
 652                 case NL80211_IFTYPE_AP:
 653                 case NL80211_IFTYPE_MESH_POINT:
 654                 case NL80211_IFTYPE_OCB:
 655                         netif_carrier_off(dev);
 656                         break;
 657                 case NL80211_IFTYPE_WDS:
 658                 case NL80211_IFTYPE_P2P_DEVICE:
 659                 case NL80211_IFTYPE_NAN:
 660                         break;
 661                 default:
 662                         /* not reached */
 663                         WARN_ON(1);
 664                 }
 665
 666                 /*
 667                  * Set default queue parameters so drivers don't
 668                  * need to initialise the hardware if the hardware
 669                  * doesn't start up with sane defaults.
 670                  * Enable QoS for anything but station interfaces.
 671                  */
 672                 ieee80211_set_wmm_default(sdata, true,
 673                         sdata->vif.type != NL80211_IFTYPE_STATION);
 674         }
 675
 676         set_bit(SDATA_STATE_RUNNING, &sdata->state);
 677
 678         if (sdata->vif.type == NL80211_IFTYPE_WDS) {
 679                 /* Create STA entry for the WDS peer */
 680                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
 681                                      GFP_KERNEL);
 682                 if (!sta) {
 683                         res = -ENOMEM;
 684                         goto err_del_interface;
 685                 }
 686
 687                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
 688                 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
 689                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
 690
 691                 res = sta_info_insert(sta);
 692                 if (res) {
 693                         /* STA has been freed */
 694                         goto err_del_interface;
 695                 }
 696
 697                 rate_control_rate_init(sta);
 698                 netif_carrier_on(dev);
 699         } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
 700                 rcu_assign_pointer(local->p2p_sdata, sdata);
 701         }
 702
 703         /*
 704          * set_multicast_list will be invoked by the networking core
 705          * which will check whether any increments here were done in
 706          * error and sync them down to the hardware as filter flags.
 707          */
 708         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 709                 atomic_inc(&local->iff_allmultis);
 710
 711         if (coming_up)
 712                 local->open_count++;
 713
 714         if (hw_reconf_flags)
 715                 ieee80211_hw_config(local, hw_reconf_flags);
 716
 717         ieee80211_recalc_ps(local);
 718
 719         if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
 720             sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 721                 /* XXX: for AP_VLAN, actually track AP queues */
 722                 netif_tx_start_all_queues(dev);
 723         } else if (dev) {
 724                 unsigned long flags;
 725                 int n_acs = IEEE80211_NUM_ACS;
 726                 int ac;
 727
 728                 if (local->hw.queues < IEEE80211_NUM_ACS)
 729                         n_acs = 1;
 730
 731                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 732                 if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE ||
 733                     (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 &&
 734                      skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) {
 735                         for (ac = 0; ac < n_acs; ac++) {
 736                                 int ac_queue = sdata->vif.hw_queue[ac];
 737
 738                                 if (local->queue_stop_reasons[ac_queue] == 0 &&
 739                                     skb_queue_empty(&local->pending[ac_queue]))
 740                                         netif_start_subqueue(dev, ac);
 741                         }
 742                 }
 743                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 744         }
 745
 746         return 0;
 747  err_del_interface:
 748         drv_remove_interface(local, sdata);
 749  err_stop:
 750         if (!local->open_count)
 751                 drv_stop(local);
 752  err_del_bss:
 753         sdata->bss = NULL;
 754         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 755                 mutex_lock(&local->mtx);
 756                 list_del(&sdata->u.vlan.list);
 757                 mutex_unlock(&local->mtx);
 758         }
 759         /* might already be clear but that doesn't matter */
 760         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 761         return res;
 762 }
 763
 764 static int ieee80211_open(struct net_device *dev)
 765 {
 766         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 767         int err;
 768
 769         /* fail early if user set an invalid address */
 770         if (!is_valid_ether_addr(dev->dev_addr))
 771                 return -EADDRNOTAVAIL;
 772
 773         err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
 774         if (err)
 775                 return err;
 776
 777         return ieee80211_do_open(&sdata->wdev, true);
 778 }
 779
 780 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
 781                               bool going_down)
 782 {
 783         struct ieee80211_local *local = sdata->local;
 784         struct fq *fq = &local->fq;
 785         unsigned long flags;
 786         struct sk_buff *skb, *tmp;
 787         u32 hw_reconf_flags = 0;
 788         int i, flushed;
 789         struct ps_data *ps;
 790         struct cfg80211_chan_def chandef;
 791         bool cancel_scan;
 792         struct cfg80211_nan_func *func;
 793
 794         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 795
 796         cancel_scan = rcu_access_pointer(local->scan_sdata) == sdata;
 797         if (cancel_scan)
 798                 ieee80211_scan_cancel(local);
 799
 800         /*
 801          * Stop TX on this interface first.
 802          */
 803         if (sdata->dev)
 804                 netif_tx_stop_all_queues(sdata->dev);
 805
 806         ieee80211_roc_purge(local, sdata);
 807
 808         switch (sdata->vif.type) {
 809         case NL80211_IFTYPE_STATION:
 810                 ieee80211_mgd_stop(sdata);
 811                 break;
 812         case NL80211_IFTYPE_ADHOC:
 813                 ieee80211_ibss_stop(sdata);
 814                 break;
 815         case NL80211_IFTYPE_AP:
 816                 cancel_work_sync(&sdata->u.ap.request_smps_work);
 817                 break;
 818         default:
 819                 break;
 820         }
 821
 822         /*
 823          * Remove all stations associated with this interface.
 824          *
 825          * This must be done before calling ops->remove_interface()
 826          * because otherwise we can later invoke ops->sta_notify()
 827          * whenever the STAs are removed, and that invalidates driver
 828          * assumptions about always getting a vif pointer that is valid
 829          * (because if we remove a STA after ops->remove_interface()
 830          * the driver will have removed the vif info already!)
 831          *
 832          * In WDS mode a station must exist here and be flushed, for
 833          * AP_VLANs stations may exist since there's nothing else that
 834          * would have removed them, but in other modes there shouldn't
 835          * be any stations.
 836          */
 837         flushed = sta_info_flush(sdata);
 838         WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
 839                      ((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) ||
 840                       (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1)));
 841
 842         /* don't count this interface for allmulti while it is down */
 843         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 844                 atomic_dec(&local->iff_allmultis);
 845
 846         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 847                 local->fif_pspoll--;
 848                 local->fif_probe_req--;
 849         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 850                 local->fif_probe_req--;
 851         }
 852
 853         if (sdata->dev) {
 854                 netif_addr_lock_bh(sdata->dev);
 855                 spin_lock_bh(&local->filter_lock);
 856                 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
 857                                  sdata->dev->addr_len);
 858                 spin_unlock_bh(&local->filter_lock);
 859                 netif_addr_unlock_bh(sdata->dev);
 860         }
 861
 862         del_timer_sync(&local->dynamic_ps_timer);
 863         cancel_work_sync(&local->dynamic_ps_enable_work);
 864
 865         cancel_work_sync(&sdata->recalc_smps);
 866         sdata_lock(sdata);
 867         mutex_lock(&local->mtx);
 868         sdata->vif.csa_active = false;
 869         if (sdata->vif.type == NL80211_IFTYPE_STATION)
 870                 sdata->u.mgd.csa_waiting_bcn = false;
 871         if (sdata->csa_block_tx) {
 872                 ieee80211_wake_vif_queues(local, sdata,
 873                                           IEEE80211_QUEUE_STOP_REASON_CSA);
 874                 sdata->csa_block_tx = false;
 875         }
 876         mutex_unlock(&local->mtx);
 877         sdata_unlock(sdata);
 878
 879         cancel_work_sync(&sdata->csa_finalize_work);
 880
 881         cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
 882
 883         if (sdata->wdev.cac_started) {
 884                 chandef = sdata->vif.bss_conf.chandef;
 885                 WARN_ON(local->suspended);
 886                 mutex_lock(&local->mtx);
 887                 ieee80211_vif_release_channel(sdata);
 888                 mutex_unlock(&local->mtx);
 889                 cfg80211_cac_event(sdata->dev, &chandef,
 890                                    NL80211_RADAR_CAC_ABORTED,
 891                                    GFP_KERNEL);
 892         }
 893
 894         /* APs need special treatment */
 895         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 896                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
 897
 898                 /* down all dependent devices, that is VLANs */
 899                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
 900                                          u.vlan.list)
 901                         dev_close(vlan->dev);
 902                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
 903         } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 904                 /* remove all packets in parent bc_buf pointing to this dev */
 905                 ps = &sdata->bss->ps;
 906
 907                 spin_lock_irqsave(&ps->bc_buf.lock, flags);
 908                 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
 909                         if (skb->dev == sdata->dev) {
 910                                 __skb_unlink(skb, &ps->bc_buf);
 911                                 local->total_ps_buffered--;
 912                                 ieee80211_free_txskb(&local->hw, skb);
 913                         }
 914                 }
 915                 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
 916         }
 917
 918         if (going_down)
 919                 local->open_count--;
 920
 921         switch (sdata->vif.type) {
 922         case NL80211_IFTYPE_AP_VLAN:
 923                 mutex_lock(&local->mtx);
 924                 list_del(&sdata->u.vlan.list);
 925                 mutex_unlock(&local->mtx);
 926                 RCU_INIT_POINTER(sdata->vif.chanctx_conf, NULL);
 927                 /* see comment in the default case below */
 928                 ieee80211_free_keys(sdata, true);
 929                 /* no need to tell driver */
 930                 break;
 931         case NL80211_IFTYPE_MONITOR:
 932                 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
 933                         local->cooked_mntrs--;
 934                         break;
 935                 }
 936
 937                 local->monitors--;
 938                 if (local->monitors == 0) {
 939                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
 940                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 941                 }
 942
 943                 ieee80211_adjust_monitor_flags(sdata, -1);
 944                 break;
 945         case NL80211_IFTYPE_NAN:
 946                 /* clean all the functions */
 947                 spin_lock_bh(&sdata->u.nan.func_lock);
 948
 949                 idr_for_each_entry(&sdata->u.nan.function_inst_ids, func, i) {
 950                         idr_remove(&sdata->u.nan.function_inst_ids, i);
 951                         cfg80211_free_nan_func(func);
 952                 }
 953                 idr_destroy(&sdata->u.nan.function_inst_ids);
 954
 955                 spin_unlock_bh(&sdata->u.nan.func_lock);
 956                 break;
 957         case NL80211_IFTYPE_P2P_DEVICE:
 958                 /* relies on synchronize_rcu() below */
 959                 RCU_INIT_POINTER(local->p2p_sdata, NULL);
 960                 /* fall through */
 961         default:
 962                 cancel_work_sync(&sdata->work);
 963                 /*
 964                  * When we get here, the interface is marked down.
 965                  * Free the remaining keys, if there are any
 966                  * (which can happen in AP mode if userspace sets
 967                  * keys before the interface is operating, and maybe
 968                  * also in WDS mode)
 969                  *
 970                  * Force the key freeing to always synchronize_net()
 971                  * to wait for the RX path in case it is using this
 972                  * interface enqueuing frames at this very time on
 973                  * another CPU.
 974                  */
 975                 ieee80211_free_keys(sdata, true);
 976                 skb_queue_purge(&sdata->skb_queue);
 977         }
 978
 979         sdata->bss = NULL;
 980
 981         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 982         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 983                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
 984                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 985                         if (info->control.vif == &sdata->vif) {
 986                                 __skb_unlink(skb, &local->pending[i]);
 987                                 ieee80211_free_txskb(&local->hw, skb);
 988                         }
 989                 }
 990         }
 991         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 992
 993         if (sdata->vif.txq) {
 994                 struct txq_info *txqi = to_txq_info(sdata->vif.txq);
 995
 996                 spin_lock_bh(&fq->lock);
 997                 ieee80211_txq_purge(local, txqi);
 998                 spin_unlock_bh(&fq->lock);
 999         }
1000
1001         if (local->open_count == 0)
1002                 ieee80211_clear_tx_pending(local);
1003
1004         /*
1005          * If the interface goes down while suspended, presumably because
1006          * the device was unplugged and that happens before our resume,
1007          * then the driver is already unconfigured and the remainder of
1008          * this function isn't needed.
1009          * XXX: what about WoWLAN? If the device has software state, e.g.
1010          *      memory allocated, it might expect teardown commands from
1011          *      mac80211 here?
1012          */
1013         if (local->suspended) {
1014                 WARN_ON(local->wowlan);
1015                 WARN_ON(rtnl_dereference(local->monitor_sdata));
1016                 return;
1017         }
1018
1019         switch (sdata->vif.type) {
1020         case NL80211_IFTYPE_AP_VLAN:
1021                 break;
1022         case NL80211_IFTYPE_MONITOR:
1023                 if (local->monitors == 0)
1024                         ieee80211_del_virtual_monitor(local);
1025
1026                 mutex_lock(&local->mtx);
1027                 ieee80211_recalc_idle(local);
1028                 mutex_unlock(&local->mtx);
1029
1030                 if (!(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
1031                         break;
1032
1033                 /* fall through */
1034         default:
1035                 if (going_down)
1036                         drv_remove_interface(local, sdata);
1037         }
1038
1039         ieee80211_recalc_ps(local);
1040
1041         if (cancel_scan)
1042                 flush_delayed_work(&local->scan_work);
1043
1044         if (local->open_count == 0) {
1045                 ieee80211_stop_device(local);
1046
1047                 /* no reconfiguring after stop! */
1048                 return;
1049         }
1050
1051         /* do after stop to avoid reconfiguring when we stop anyway */
1052         ieee80211_configure_filter(local);
1053         ieee80211_hw_config(local, hw_reconf_flags);
1054
1055         if (local->monitors == local->open_count)
1056                 ieee80211_add_virtual_monitor(local);
1057 }
1058
1059 static int ieee80211_stop(struct net_device *dev)
1060 {
1061         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1062
1063         ieee80211_do_stop(sdata, true);
1064
1065         return 0;
1066 }
1067
1068 static void ieee80211_set_multicast_list(struct net_device *dev)
1069 {
1070         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1071         struct ieee80211_local *local = sdata->local;
1072         int allmulti, sdata_allmulti;
1073
1074         allmulti = !!(dev->flags & IFF_ALLMULTI);
1075         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
1076
1077         if (allmulti != sdata_allmulti) {
1078                 if (dev->flags & IFF_ALLMULTI)
1079                         atomic_inc(&local->iff_allmultis);
1080                 else
1081                         atomic_dec(&local->iff_allmultis);
1082                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
1083         }
1084
1085         spin_lock_bh(&local->filter_lock);
1086         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
1087         spin_unlock_bh(&local->filter_lock);
1088         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
1089 }
1090
1091 /*
1092  * Called when the netdev is removed or, by the code below, before
1093  * the interface type changes.
1094  */
1095 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
1096 {
1097         int i;
1098
1099         /* free extra data */
1100         ieee80211_free_keys(sdata, false);
1101
1102         ieee80211_debugfs_remove_netdev(sdata);
1103
1104         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1105                 __skb_queue_purge(&sdata->fragments[i].skb_list);
1106         sdata->fragment_next = 0;
1107
1108         if (ieee80211_vif_is_mesh(&sdata->vif))
1109                 ieee80211_mesh_teardown_sdata(sdata);
1110 }
1111
1112 static void ieee80211_uninit(struct net_device *dev)
1113 {
1114         ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
1115 }
1116
1117 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
1118                                          struct sk_buff *skb,
1119                                          void *accel_priv,
1120                                          select_queue_fallback_t fallback)
1121 {
1122         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
1123 }
1124
1125 static struct rtnl_link_stats64 *
1126 ieee80211_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
1127 {
1128         int i;
1129
1130         for_each_possible_cpu(i) {
1131                 const struct pcpu_sw_netstats *tstats;
1132                 u64 rx_packets, rx_bytes, tx_packets, tx_bytes;
1133                 unsigned int start;
1134
1135                 tstats = per_cpu_ptr(dev->tstats, i);
1136
1137                 do {
1138                         start = u64_stats_fetch_begin_irq(&tstats->syncp);
1139                         rx_packets = tstats->rx_packets;
1140                         tx_packets = tstats->tx_packets;
1141                         rx_bytes = tstats->rx_bytes;
1142                         tx_bytes = tstats->tx_bytes;
1143                 } while (u64_stats_fetch_retry_irq(&tstats->syncp, start));
1144
1145                 stats->rx_packets += rx_packets;
1146                 stats->tx_packets += tx_packets;
1147                 stats->rx_bytes   += rx_bytes;
1148                 stats->tx_bytes   += tx_bytes;
1149         }
1150
1151         return stats;
1152 }
1153
1154 static const struct net_device_ops ieee80211_dataif_ops = {
1155         .ndo_open               = ieee80211_open,
1156         .ndo_stop               = ieee80211_stop,
1157         .ndo_uninit             = ieee80211_uninit,
1158         .ndo_start_xmit         = ieee80211_subif_start_xmit,
1159         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1160         .ndo_set_mac_address    = ieee80211_change_mac,
1161         .ndo_select_queue       = ieee80211_netdev_select_queue,
1162         .ndo_get_stats64        = ieee80211_get_stats64,
1163 };
1164
1165 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
1166                                           struct sk_buff *skb,
1167                                           void *accel_priv,
1168                                           select_queue_fallback_t fallback)
1169 {
1170         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1171         struct ieee80211_local *local = sdata->local;
1172         struct ieee80211_hdr *hdr;
1173         struct ieee80211_radiotap_header *rtap = (void *)skb->data;
1174
1175         if (local->hw.queues < IEEE80211_NUM_ACS)
1176                 return 0;
1177
1178         if (skb->len < 4 ||
1179             skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
1180                 return 0; /* doesn't matter, frame will be dropped */
1181
1182         hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
1183
1184         return ieee80211_select_queue_80211(sdata, skb, hdr);
1185 }
1186
1187 static const struct net_device_ops ieee80211_monitorif_ops = {
1188         .ndo_open               = ieee80211_open,
1189         .ndo_stop               = ieee80211_stop,
1190         .ndo_uninit             = ieee80211_uninit,
1191         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
1192         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1193         .ndo_set_mac_address    = ieee80211_change_mac,
1194         .ndo_select_queue       = ieee80211_monitor_select_queue,
1195         .ndo_get_stats64        = ieee80211_get_stats64,
1196 };
1197
1198 static void ieee80211_if_free(struct net_device *dev)
1199 {
1200         free_percpu(dev->tstats);
1201         free_netdev(dev);
1202 }
1203
1204 static void ieee80211_if_setup(struct net_device *dev)
1205 {
1206         ether_setup(dev);
1207         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1208         dev->netdev_ops = &ieee80211_dataif_ops;
1209         dev->destructor = ieee80211_if_free;
1210 }
1211
1212 static void ieee80211_if_setup_no_queue(struct net_device *dev)
1213 {
1214         ieee80211_if_setup(dev);
1215         dev->priv_flags |= IFF_NO_QUEUE;
1216 }
1217
1218 static void ieee80211_iface_work(struct work_struct *work)
1219 {
1220         struct ieee80211_sub_if_data *sdata =
1221                 container_of(work, struct ieee80211_sub_if_data, work);
1222         struct ieee80211_local *local = sdata->local;
1223         struct sk_buff *skb;
1224         struct sta_info *sta;
1225         struct ieee80211_ra_tid *ra_tid;
1226         struct ieee80211_rx_agg *rx_agg;
1227
1228         if (!ieee80211_sdata_running(sdata))
1229                 return;
1230
1231         if (test_bit(SCAN_SW_SCANNING, &local->scanning))
1232                 return;
1233
1234         if (!ieee80211_can_run_worker(local))
1235                 return;
1236
1237         /* first process frames */
1238         while ((skb = skb_dequeue(&sdata->skb_queue))) {
1239                 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1240
1241                 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
1242                         ra_tid = (void *)&skb->cb;
1243                         ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
1244                                                  ra_tid->tid);
1245                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
1246                         ra_tid = (void *)&skb->cb;
1247                         ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
1248                                                 ra_tid->tid);
1249                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_RX_AGG_START) {
1250                         rx_agg = (void *)&skb->cb;
1251                         mutex_lock(&local->sta_mtx);
1252                         sta = sta_info_get_bss(sdata, rx_agg->addr);
1253                         if (sta)
1254                                 __ieee80211_start_rx_ba_session(sta,
1255                                                 0, 0, 0, 1, rx_agg->tid,
1256                                                 IEEE80211_MAX_AMPDU_BUF,
1257                                                 false, true);
1258                         mutex_unlock(&local->sta_mtx);
1259                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_RX_AGG_STOP) {
1260                         rx_agg = (void *)&skb->cb;
1261                         mutex_lock(&local->sta_mtx);
1262                         sta = sta_info_get_bss(sdata, rx_agg->addr);
1263                         if (sta)
1264                                 __ieee80211_stop_rx_ba_session(sta,
1265                                                         rx_agg->tid,
1266                                                         WLAN_BACK_RECIPIENT, 0,
1267                                                         false);
1268                         mutex_unlock(&local->sta_mtx);
1269                 } else if (ieee80211_is_action(mgmt->frame_control) &&
1270                            mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1271                         int len = skb->len;
1272
1273                         mutex_lock(&local->sta_mtx);
1274                         sta = sta_info_get_bss(sdata, mgmt->sa);
1275                         if (sta) {
1276                                 switch (mgmt->u.action.u.addba_req.action_code) {
1277                                 case WLAN_ACTION_ADDBA_REQ:
1278                                         ieee80211_process_addba_request(
1279                                                         local, sta, mgmt, len);
1280                                         break;
1281                                 case WLAN_ACTION_ADDBA_RESP:
1282                                         ieee80211_process_addba_resp(local, sta,
1283                                                                      mgmt, len);
1284                                         break;
1285                                 case WLAN_ACTION_DELBA:
1286                                         ieee80211_process_delba(sdata, sta,
1287                                                                 mgmt, len);
1288                                         break;
1289                                 default:
1290                                         WARN_ON(1);
1291                                         break;
1292                                 }
1293                         }
1294                         mutex_unlock(&local->sta_mtx);
1295                 } else if (ieee80211_is_action(mgmt->frame_control) &&
1296                            mgmt->u.action.category == WLAN_CATEGORY_VHT) {
1297                         switch (mgmt->u.action.u.vht_group_notif.action_code) {
1298                         case WLAN_VHT_ACTION_GROUPID_MGMT:
1299                                 ieee80211_process_mu_groups(sdata, mgmt);
1300                                 break;
1301                         default:
1302                                 WARN_ON(1);
1303                                 break;
1304                         }
1305                 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1306                         struct ieee80211_hdr *hdr = (void *)mgmt;
1307                         /*
1308                          * So the frame isn't mgmt, but frame_control
1309                          * is at the right place anyway, of course, so
1310                          * the if statement is correct.
1311                          *
1312                          * Warn if we have other data frame types here,
1313                          * they must not get here.
1314                          */
1315                         WARN_ON(hdr->frame_control &
1316                                         cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1317                         WARN_ON(!(hdr->seq_ctrl &
1318                                         cpu_to_le16(IEEE80211_SCTL_FRAG)));
1319                         /*
1320                          * This was a fragment of a frame, received while
1321                          * a block-ack session was active. That cannot be
1322                          * right, so terminate the session.
1323                          */
1324                         mutex_lock(&local->sta_mtx);
1325                         sta = sta_info_get_bss(sdata, mgmt->sa);
1326                         if (sta) {
1327                                 u16 tid = *ieee80211_get_qos_ctl(hdr) &
1328                                                 IEEE80211_QOS_CTL_TID_MASK;
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                 BUG();
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                 /* otherwise 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                         txq_size += sizeof(struct txq_info) +
1758                                     local->hw.txq_data_size;
1759
1760                 if (local->ops->wake_tx_queue)
1761                         if_setup = ieee80211_if_setup_no_queue;
1762                 else
1763                         if_setup = ieee80211_if_setup;
1764
1765                 if (local->hw.queues >= IEEE80211_NUM_ACS)
1766                         txqs = IEEE80211_NUM_ACS;
1767
1768                 ndev = alloc_netdev_mqs(size + txq_size,
1769                                         name, name_assign_type,
1770                                         if_setup, txqs, 1);
1771                 if (!ndev)
1772                         return -ENOMEM;
1773                 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1774
1775                 ndev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1776                 if (!ndev->tstats) {
1777                         free_netdev(ndev);
1778                         return -ENOMEM;
1779                 }
1780
1781                 ndev->needed_headroom = local->tx_headroom +
1782                                         4*6 /* four MAC addresses */
1783                                         + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1784                                         + 6 /* mesh */
1785                                         + 8 /* rfc1042/bridge tunnel */
1786                                         - ETH_HLEN /* ethernet hard_header_len */
1787                                         + IEEE80211_ENCRYPT_HEADROOM;
1788                 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1789
1790                 ret = dev_alloc_name(ndev, ndev->name);
1791                 if (ret < 0) {
1792                         ieee80211_if_free(ndev);
1793                         return ret;
1794                 }
1795
1796                 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1797                 if (params && is_valid_ether_addr(params->macaddr))
1798                         memcpy(ndev->dev_addr, params->macaddr, ETH_ALEN);
1799                 else
1800                         memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1801                 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1802
1803                 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1804                 sdata = netdev_priv(ndev);
1805                 ndev->ieee80211_ptr = &sdata->wdev;
1806                 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1807                 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1808
1809                 if (txq_size) {
1810                         txqi = netdev_priv(ndev) + size;
1811                         ieee80211_txq_init(sdata, NULL, txqi, 0);
1812                 }
1813
1814                 sdata->dev = ndev;
1815         }
1816
1817         /* initialise type-independent data */
1818         sdata->wdev.wiphy = local->hw.wiphy;
1819         sdata->local = local;
1820
1821         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1822                 skb_queue_head_init(&sdata->fragments[i].skb_list);
1823
1824         INIT_LIST_HEAD(&sdata->key_list);
1825
1826         INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
1827                           ieee80211_dfs_cac_timer_work);
1828         INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
1829                           ieee80211_delayed_tailroom_dec);
1830
1831         for (i = 0; i < NUM_NL80211_BANDS; i++) {
1832                 struct ieee80211_supported_band *sband;
1833                 sband = local->hw.wiphy->bands[i];
1834                 sdata->rc_rateidx_mask[i] =
1835                         sband ? (1 << sband->n_bitrates) - 1 : 0;
1836                 if (sband) {
1837                         __le16 cap;
1838                         u16 *vht_rate_mask;
1839
1840                         memcpy(sdata->rc_rateidx_mcs_mask[i],
1841                                sband->ht_cap.mcs.rx_mask,
1842                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1843
1844                         cap = sband->vht_cap.vht_mcs.rx_mcs_map;
1845                         vht_rate_mask = sdata->rc_rateidx_vht_mcs_mask[i];
1846                         ieee80211_get_vht_mask_from_cap(cap, vht_rate_mask);
1847                 } else {
1848                         memset(sdata->rc_rateidx_mcs_mask[i], 0,
1849                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1850                         memset(sdata->rc_rateidx_vht_mcs_mask[i], 0,
1851                                sizeof(sdata->rc_rateidx_vht_mcs_mask[i]));
1852                 }
1853         }
1854
1855         ieee80211_set_default_queues(sdata);
1856
1857         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1858         sdata->user_power_level = local->user_power_level;
1859
1860         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1861
1862         /* setup type-dependent data */
1863         ieee80211_setup_sdata(sdata, type);
1864
1865         if (ndev) {
1866                 if (params) {
1867                         ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1868                         if (type == NL80211_IFTYPE_STATION)
1869                                 sdata->u.mgd.use_4addr = params->use_4addr;
1870                 }
1871
1872                 ndev->features |= local->hw.netdev_features;
1873
1874                 netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops);
1875
1876                 /* MTU range: 256 - 2304 */
1877                 ndev->min_mtu = 256;
1878                 ndev->max_mtu = IEEE80211_MAX_DATA_LEN;
1879
1880                 ret = register_netdevice(ndev);
1881                 if (ret) {
1882                         ieee80211_if_free(ndev);
1883                         return ret;
1884                 }
1885         }
1886
1887         mutex_lock(&local->iflist_mtx);
1888         list_add_tail_rcu(&sdata->list, &local->interfaces);
1889         mutex_unlock(&local->iflist_mtx);
1890
1891         if (new_wdev)
1892                 *new_wdev = &sdata->wdev;
1893
1894         return 0;
1895 }
1896
1897 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1898 {
1899         ASSERT_RTNL();
1900
1901         mutex_lock(&sdata->local->iflist_mtx);
1902         list_del_rcu(&sdata->list);
1903         mutex_unlock(&sdata->local->iflist_mtx);
1904
1905         synchronize_rcu();
1906
1907         if (sdata->dev) {
1908                 unregister_netdevice(sdata->dev);
1909         } else {
1910                 cfg80211_unregister_wdev(&sdata->wdev);
1911                 ieee80211_teardown_sdata(sdata);
1912                 kfree(sdata);
1913         }
1914 }
1915
1916 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
1917 {
1918         if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
1919                 return;
1920         ieee80211_do_stop(sdata, true);
1921 }
1922
1923 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1924 {
1925         struct ieee80211_sub_if_data *sdata, *tmp;
1926         LIST_HEAD(unreg_list);
1927         LIST_HEAD(wdev_list);
1928
1929         ASSERT_RTNL();
1930
1931         /* Before destroying the interfaces, make sure they're all stopped so
1932          * that the hardware is stopped. Otherwise, the driver might still be
1933          * iterating the interfaces during the shutdown, e.g. from a worker
1934          * or from RX processing or similar, and if it does so (using atomic
1935          * iteration) while we're manipulating the list, the iteration will
1936          * crash.
1937          *
1938          * After this, the hardware should be stopped and the driver should
1939          * have stopped all of its activities, so that we can do RCU-unaware
1940          * manipulations of the interface list below.
1941          */
1942         cfg80211_shutdown_all_interfaces(local->hw.wiphy);
1943
1944         WARN(local->open_count, "%s: open count remains %d\n",
1945              wiphy_name(local->hw.wiphy), local->open_count);
1946
1947         mutex_lock(&local->iflist_mtx);
1948         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1949                 list_del(&sdata->list);
1950
1951                 if (sdata->dev)
1952                         unregister_netdevice_queue(sdata->dev, &unreg_list);
1953                 else
1954                         list_add(&sdata->list, &wdev_list);
1955         }
1956         mutex_unlock(&local->iflist_mtx);
1957         unregister_netdevice_many(&unreg_list);
1958
1959         list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
1960                 list_del(&sdata->list);
1961                 cfg80211_unregister_wdev(&sdata->wdev);
1962                 kfree(sdata);
1963         }
1964 }
1965
1966 static int netdev_notify(struct notifier_block *nb,
1967                          unsigned long state, void *ptr)
1968 {
1969         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1970         struct ieee80211_sub_if_data *sdata;
1971
1972         if (state != NETDEV_CHANGENAME)
1973                 return NOTIFY_DONE;
1974
1975         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1976                 return NOTIFY_DONE;
1977
1978         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1979                 return NOTIFY_DONE;
1980
1981         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1982         memcpy(sdata->name, dev->name, IFNAMSIZ);
1983         ieee80211_debugfs_rename_netdev(sdata);
1984
1985         return NOTIFY_OK;
1986 }
1987
1988 static struct notifier_block mac80211_netdev_notifier = {
1989         .notifier_call = netdev_notify,
1990 };
1991
1992 int ieee80211_iface_init(void)
1993 {
1994         return register_netdevice_notifier(&mac80211_netdev_notifier);
1995 }
1996
1997 void ieee80211_iface_exit(void)
1998 {
1999         unregister_netdevice_notifier(&mac80211_netdev_notifier);
2000 }
2001
2002 void ieee80211_vif_inc_num_mcast(struct ieee80211_sub_if_data *sdata)
2003 {
2004         if (sdata->vif.type == NL80211_IFTYPE_AP)
2005                 atomic_inc(&sdata->u.ap.num_mcast_sta);
2006         else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2007                 atomic_inc(&sdata->u.vlan.num_mcast_sta);
2008 }
2009
2010 void ieee80211_vif_dec_num_mcast(struct ieee80211_sub_if_data *sdata)
2011 {
2012         if (sdata->vif.type == NL80211_IFTYPE_AP)
2013                 atomic_dec(&sdata->u.ap.num_mcast_sta);
2014         else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2015                 atomic_dec(&sdata->u.vlan.num_mcast_sta);
2016 }