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  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  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 bool __ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
  46 {
  47         struct ieee80211_chanctx_conf *chanctx_conf;
  48         int power;
  49
  50         rcu_read_lock();
  51         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
  52         if (!chanctx_conf) {
  53                 rcu_read_unlock();
  54                 return false;
  55         }
  56
  57         power = ieee80211_chandef_max_power(&chanctx_conf->def);
  58         rcu_read_unlock();
  59
  60         if (sdata->user_power_level != IEEE80211_UNSET_POWER_LEVEL)
  61                 power = min(power, sdata->user_power_level);
  62
  63         if (sdata->ap_power_level != IEEE80211_UNSET_POWER_LEVEL)
  64                 power = min(power, sdata->ap_power_level);
  65
  66         if (power != sdata->vif.bss_conf.txpower) {
  67                 sdata->vif.bss_conf.txpower = power;
  68                 ieee80211_hw_config(sdata->local, 0);
  69                 return true;
  70         }
  71
  72         return false;
  73 }
  74
  75 void ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
  76 {
  77         if (__ieee80211_recalc_txpower(sdata))
  78                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_TXPOWER);
  79 }
  80
  81 static u32 __ieee80211_idle_off(struct ieee80211_local *local)
  82 {
  83         if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
  84                 return 0;
  85
  86         local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
  87         return IEEE80211_CONF_CHANGE_IDLE;
  88 }
  89
  90 static u32 __ieee80211_idle_on(struct ieee80211_local *local)
  91 {
  92         if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
  93                 return 0;
  94
  95         ieee80211_flush_queues(local, NULL);
  96
  97         local->hw.conf.flags |= IEEE80211_CONF_IDLE;
  98         return IEEE80211_CONF_CHANGE_IDLE;
  99 }
 100
 101 static u32 __ieee80211_recalc_idle(struct ieee80211_local *local,
 102                                    bool force_active)
 103 {
 104         bool working = false, scanning, active;
 105         unsigned int led_trig_start = 0, led_trig_stop = 0;
 106         struct ieee80211_roc_work *roc;
 107
 108         lockdep_assert_held(&local->mtx);
 109
 110         active = force_active ||
 111                  !list_empty(&local->chanctx_list) ||
 112                  local->monitors;
 113
 114         if (!local->ops->remain_on_channel) {
 115                 list_for_each_entry(roc, &local->roc_list, list) {
 116                         working = true;
 117                         break;
 118                 }
 119         }
 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_change_mtu(struct net_device *dev, int new_mtu)
 154 {
 155         if (new_mtu < 256 || new_mtu > IEEE80211_MAX_DATA_LEN)
 156                 return -EINVAL;
 157
 158         dev->mtu = new_mtu;
 159         return 0;
 160 }
 161
 162 static int ieee80211_verify_mac(struct ieee80211_sub_if_data *sdata, u8 *addr,
 163                                 bool check_dup)
 164 {
 165         struct ieee80211_local *local = sdata->local;
 166         struct ieee80211_sub_if_data *iter;
 167         u64 new, mask, tmp;
 168         u8 *m;
 169         int ret = 0;
 170
 171         if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
 172                 return 0;
 173
 174         m = addr;
 175         new =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 176                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 177                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 178
 179         m = local->hw.wiphy->addr_mask;
 180         mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 181                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 182                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 183
 184         if (!check_dup)
 185                 return ret;
 186
 187         mutex_lock(&local->iflist_mtx);
 188         list_for_each_entry(iter, &local->interfaces, list) {
 189                 if (iter == sdata)
 190                         continue;
 191
 192                 if (iter->vif.type == NL80211_IFTYPE_MONITOR &&
 193                     !(iter->u.mntr_flags & MONITOR_FLAG_ACTIVE))
 194                         continue;
 195
 196                 m = iter->vif.addr;
 197                 tmp =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 198                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 199                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 200
 201                 if ((new & ~mask) != (tmp & ~mask)) {
 202                         ret = -EINVAL;
 203                         break;
 204                 }
 205         }
 206         mutex_unlock(&local->iflist_mtx);
 207
 208         return ret;
 209 }
 210
 211 static int ieee80211_change_mac(struct net_device *dev, void *addr)
 212 {
 213         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 214         struct sockaddr *sa = addr;
 215         bool check_dup = true;
 216         int ret;
 217
 218         if (ieee80211_sdata_running(sdata))
 219                 return -EBUSY;
 220
 221         if (sdata->vif.type == NL80211_IFTYPE_MONITOR &&
 222             !(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE))
 223                 check_dup = false;
 224
 225         ret = ieee80211_verify_mac(sdata, sa->sa_data, check_dup);
 226         if (ret)
 227                 return ret;
 228
 229         ret = eth_mac_addr(dev, sa);
 230
 231         if (ret == 0)
 232                 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
 233
 234         return ret;
 235 }
 236
 237 static inline int identical_mac_addr_allowed(int type1, int type2)
 238 {
 239         return type1 == NL80211_IFTYPE_MONITOR ||
 240                 type2 == NL80211_IFTYPE_MONITOR ||
 241                 type1 == NL80211_IFTYPE_P2P_DEVICE ||
 242                 type2 == NL80211_IFTYPE_P2P_DEVICE ||
 243                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
 244                 (type1 == NL80211_IFTYPE_WDS &&
 245                         (type2 == NL80211_IFTYPE_WDS ||
 246                          type2 == NL80211_IFTYPE_AP)) ||
 247                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
 248                 (type1 == NL80211_IFTYPE_AP_VLAN &&
 249                         (type2 == NL80211_IFTYPE_AP ||
 250                          type2 == NL80211_IFTYPE_AP_VLAN));
 251 }
 252
 253 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
 254                                             enum nl80211_iftype iftype)
 255 {
 256         struct ieee80211_local *local = sdata->local;
 257         struct ieee80211_sub_if_data *nsdata;
 258
 259         ASSERT_RTNL();
 260
 261         /* we hold the RTNL here so can safely walk the list */
 262         list_for_each_entry(nsdata, &local->interfaces, list) {
 263                 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
 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         return 0;
 309 }
 310
 311 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata,
 312                                   enum nl80211_iftype iftype)
 313 {
 314         int n_queues = sdata->local->hw.queues;
 315         int i;
 316
 317         if (iftype != NL80211_IFTYPE_P2P_DEVICE) {
 318                 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 319                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
 320                                          IEEE80211_INVAL_HW_QUEUE))
 321                                 return -EINVAL;
 322                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
 323                                          n_queues))
 324                                 return -EINVAL;
 325                 }
 326         }
 327
 328         if ((iftype != NL80211_IFTYPE_AP &&
 329              iftype != NL80211_IFTYPE_P2P_GO &&
 330              iftype != NL80211_IFTYPE_MESH_POINT) ||
 331             !(sdata->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)) {
 332                 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
 333                 return 0;
 334         }
 335
 336         if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
 337                 return -EINVAL;
 338
 339         if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
 340                 return -EINVAL;
 341
 342         return 0;
 343 }
 344
 345 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
 346                                     const int offset)
 347 {
 348         struct ieee80211_local *local = sdata->local;
 349         u32 flags = sdata->u.mntr_flags;
 350
 351 #define ADJUST(_f, _s)  do {                                    \
 352         if (flags & MONITOR_FLAG_##_f)                          \
 353                 local->fif_##_s += offset;                      \
 354         } while (0)
 355
 356         ADJUST(FCSFAIL, fcsfail);
 357         ADJUST(PLCPFAIL, plcpfail);
 358         ADJUST(CONTROL, control);
 359         ADJUST(CONTROL, pspoll);
 360         ADJUST(OTHER_BSS, other_bss);
 361
 362 #undef ADJUST
 363 }
 364
 365 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
 366 {
 367         struct ieee80211_local *local = sdata->local;
 368         int i;
 369
 370         for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 371                 if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
 372                         sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
 373                 else if (local->hw.queues >= IEEE80211_NUM_ACS)
 374                         sdata->vif.hw_queue[i] = i;
 375                 else
 376                         sdata->vif.hw_queue[i] = 0;
 377         }
 378         sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
 379 }
 380
 381 int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
 382 {
 383         struct ieee80211_sub_if_data *sdata;
 384         int ret;
 385
 386         if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
 387                 return 0;
 388
 389         ASSERT_RTNL();
 390
 391         if (local->monitor_sdata)
 392                 return 0;
 393
 394         sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
 395         if (!sdata)
 396                 return -ENOMEM;
 397
 398         /* set up data */
 399         sdata->local = local;
 400         sdata->vif.type = NL80211_IFTYPE_MONITOR;
 401         snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
 402                  wiphy_name(local->hw.wiphy));
 403
 404         ieee80211_set_default_queues(sdata);
 405
 406         ret = drv_add_interface(local, sdata);
 407         if (WARN_ON(ret)) {
 408                 /* ok .. stupid driver, it asked for this! */
 409                 kfree(sdata);
 410                 return ret;
 411         }
 412
 413         ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR);
 414         if (ret) {
 415                 kfree(sdata);
 416                 return ret;
 417         }
 418
 419         ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef,
 420                                         IEEE80211_CHANCTX_EXCLUSIVE);
 421         if (ret) {
 422                 drv_remove_interface(local, sdata);
 423                 kfree(sdata);
 424                 return ret;
 425         }
 426
 427         mutex_lock(&local->iflist_mtx);
 428         rcu_assign_pointer(local->monitor_sdata, sdata);
 429         mutex_unlock(&local->iflist_mtx);
 430
 431         return 0;
 432 }
 433
 434 void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
 435 {
 436         struct ieee80211_sub_if_data *sdata;
 437
 438         if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
 439                 return;
 440
 441         ASSERT_RTNL();
 442
 443         mutex_lock(&local->iflist_mtx);
 444
 445         sdata = rcu_dereference_protected(local->monitor_sdata,
 446                                           lockdep_is_held(&local->iflist_mtx));
 447         if (!sdata) {
 448                 mutex_unlock(&local->iflist_mtx);
 449                 return;
 450         }
 451
 452         rcu_assign_pointer(local->monitor_sdata, NULL);
 453         mutex_unlock(&local->iflist_mtx);
 454
 455         synchronize_net();
 456
 457         ieee80211_vif_release_channel(sdata);
 458
 459         drv_remove_interface(local, sdata);
 460
 461         kfree(sdata);
 462 }
 463
 464 /*
 465  * NOTE: Be very careful when changing this function, it must NOT return
 466  * an error on interface type changes that have been pre-checked, so most
 467  * checks should be in ieee80211_check_concurrent_iface.
 468  */
 469 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
 470 {
 471         struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
 472         struct net_device *dev = wdev->netdev;
 473         struct ieee80211_local *local = sdata->local;
 474         struct sta_info *sta;
 475         u32 changed = 0;
 476         int res;
 477         u32 hw_reconf_flags = 0;
 478
 479         switch (sdata->vif.type) {
 480         case NL80211_IFTYPE_WDS:
 481                 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
 482                         return -ENOLINK;
 483                 break;
 484         case NL80211_IFTYPE_AP_VLAN: {
 485                 struct ieee80211_sub_if_data *master;
 486
 487                 if (!sdata->bss)
 488                         return -ENOLINK;
 489
 490                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
 491
 492                 master = container_of(sdata->bss,
 493                                       struct ieee80211_sub_if_data, u.ap);
 494                 sdata->control_port_protocol =
 495                         master->control_port_protocol;
 496                 sdata->control_port_no_encrypt =
 497                         master->control_port_no_encrypt;
 498                 sdata->vif.cab_queue = master->vif.cab_queue;
 499                 memcpy(sdata->vif.hw_queue, master->vif.hw_queue,
 500                        sizeof(sdata->vif.hw_queue));
 501                 break;
 502                 }
 503         case NL80211_IFTYPE_AP:
 504                 sdata->bss = &sdata->u.ap;
 505                 break;
 506         case NL80211_IFTYPE_MESH_POINT:
 507         case NL80211_IFTYPE_STATION:
 508         case NL80211_IFTYPE_MONITOR:
 509         case NL80211_IFTYPE_ADHOC:
 510         case NL80211_IFTYPE_P2P_DEVICE:
 511                 /* no special treatment */
 512                 break;
 513         case NL80211_IFTYPE_UNSPECIFIED:
 514         case NUM_NL80211_IFTYPES:
 515         case NL80211_IFTYPE_P2P_CLIENT:
 516         case NL80211_IFTYPE_P2P_GO:
 517                 /* cannot happen */
 518                 WARN_ON(1);
 519                 break;
 520         }
 521
 522         if (local->open_count == 0) {
 523                 res = drv_start(local);
 524                 if (res)
 525                         goto err_del_bss;
 526                 /* we're brought up, everything changes */
 527                 hw_reconf_flags = ~0;
 528                 ieee80211_led_radio(local, true);
 529                 ieee80211_mod_tpt_led_trig(local,
 530                                            IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
 531         }
 532
 533         /*
 534          * Copy the hopefully now-present MAC address to
 535          * this interface, if it has the special null one.
 536          */
 537         if (dev && is_zero_ether_addr(dev->dev_addr)) {
 538                 memcpy(dev->dev_addr,
 539                        local->hw.wiphy->perm_addr,
 540                        ETH_ALEN);
 541                 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
 542
 543                 if (!is_valid_ether_addr(dev->dev_addr)) {
 544                         res = -EADDRNOTAVAIL;
 545                         goto err_stop;
 546                 }
 547         }
 548
 549         switch (sdata->vif.type) {
 550         case NL80211_IFTYPE_AP_VLAN:
 551                 /* no need to tell driver, but set carrier and chanctx */
 552                 if (rtnl_dereference(sdata->bss->beacon)) {
 553                         ieee80211_vif_vlan_copy_chanctx(sdata);
 554                         netif_carrier_on(dev);
 555                 } else {
 556                         netif_carrier_off(dev);
 557                 }
 558                 break;
 559         case NL80211_IFTYPE_MONITOR:
 560                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 561                         local->cooked_mntrs++;
 562                         break;
 563                 }
 564
 565                 if (sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE) {
 566                         res = drv_add_interface(local, sdata);
 567                         if (res)
 568                                 goto err_stop;
 569                 } else if (local->monitors == 0 && local->open_count == 0) {
 570                         res = ieee80211_add_virtual_monitor(local);
 571                         if (res)
 572                                 goto err_stop;
 573                 }
 574
 575                 /* must be before the call to ieee80211_configure_filter */
 576                 local->monitors++;
 577                 if (local->monitors == 1) {
 578                         local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
 579                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 580                 }
 581
 582                 ieee80211_adjust_monitor_flags(sdata, 1);
 583                 ieee80211_configure_filter(local);
 584                 mutex_lock(&local->mtx);
 585                 ieee80211_recalc_idle(local);
 586                 mutex_unlock(&local->mtx);
 587
 588                 netif_carrier_on(dev);
 589                 break;
 590         default:
 591                 if (coming_up) {
 592                         ieee80211_del_virtual_monitor(local);
 593
 594                         res = drv_add_interface(local, sdata);
 595                         if (res)
 596                                 goto err_stop;
 597                         res = ieee80211_check_queues(sdata,
 598                                 ieee80211_vif_type_p2p(&sdata->vif));
 599                         if (res)
 600                                 goto err_del_interface;
 601                 }
 602
 603                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
 604                         local->fif_pspoll++;
 605                         local->fif_probe_req++;
 606
 607                         ieee80211_configure_filter(local);
 608                 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 609                         local->fif_probe_req++;
 610                 }
 611
 612                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
 613                         changed |= ieee80211_reset_erp_info(sdata);
 614                 ieee80211_bss_info_change_notify(sdata, changed);
 615
 616                 switch (sdata->vif.type) {
 617                 case NL80211_IFTYPE_STATION:
 618                 case NL80211_IFTYPE_ADHOC:
 619                 case NL80211_IFTYPE_AP:
 620                 case NL80211_IFTYPE_MESH_POINT:
 621                         netif_carrier_off(dev);
 622                         break;
 623                 case NL80211_IFTYPE_WDS:
 624                 case NL80211_IFTYPE_P2P_DEVICE:
 625                         break;
 626                 default:
 627                         /* not reached */
 628                         WARN_ON(1);
 629                 }
 630
 631                 /*
 632                  * set default queue parameters so drivers don't
 633                  * need to initialise the hardware if the hardware
 634                  * doesn't start up with sane defaults
 635                  */
 636                 ieee80211_set_wmm_default(sdata, true);
 637         }
 638
 639         set_bit(SDATA_STATE_RUNNING, &sdata->state);
 640
 641         if (sdata->vif.type == NL80211_IFTYPE_WDS) {
 642                 /* Create STA entry for the WDS peer */
 643                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
 644                                      GFP_KERNEL);
 645                 if (!sta) {
 646                         res = -ENOMEM;
 647                         goto err_del_interface;
 648                 }
 649
 650                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
 651                 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
 652                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
 653
 654                 res = sta_info_insert(sta);
 655                 if (res) {
 656                         /* STA has been freed */
 657                         goto err_del_interface;
 658                 }
 659
 660                 rate_control_rate_init(sta);
 661                 netif_carrier_on(dev);
 662         } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
 663                 rcu_assign_pointer(local->p2p_sdata, sdata);
 664         }
 665
 666         /*
 667          * set_multicast_list will be invoked by the networking core
 668          * which will check whether any increments here were done in
 669          * error and sync them down to the hardware as filter flags.
 670          */
 671         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 672                 atomic_inc(&local->iff_allmultis);
 673
 674         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 675                 atomic_inc(&local->iff_promiscs);
 676
 677         if (coming_up)
 678                 local->open_count++;
 679
 680         if (hw_reconf_flags)
 681                 ieee80211_hw_config(local, hw_reconf_flags);
 682
 683         ieee80211_recalc_ps(local, -1);
 684
 685         if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
 686             sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 687                 /* XXX: for AP_VLAN, actually track AP queues */
 688                 netif_tx_start_all_queues(dev);
 689         } else if (dev) {
 690                 unsigned long flags;
 691                 int n_acs = IEEE80211_NUM_ACS;
 692                 int ac;
 693
 694                 if (local->hw.queues < IEEE80211_NUM_ACS)
 695                         n_acs = 1;
 696
 697                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 698                 if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE ||
 699                     (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 &&
 700                      skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) {
 701                         for (ac = 0; ac < n_acs; ac++) {
 702                                 int ac_queue = sdata->vif.hw_queue[ac];
 703
 704                                 if (local->queue_stop_reasons[ac_queue] == 0 &&
 705                                     skb_queue_empty(&local->pending[ac_queue]))
 706                                         netif_start_subqueue(dev, ac);
 707                         }
 708                 }
 709                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 710         }
 711
 712         return 0;
 713  err_del_interface:
 714         drv_remove_interface(local, sdata);
 715  err_stop:
 716         if (!local->open_count)
 717                 drv_stop(local);
 718  err_del_bss:
 719         sdata->bss = NULL;
 720         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
 721                 list_del(&sdata->u.vlan.list);
 722         /* might already be clear but that doesn't matter */
 723         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 724         return res;
 725 }
 726
 727 static int ieee80211_open(struct net_device *dev)
 728 {
 729         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 730         int err;
 731
 732         /* fail early if user set an invalid address */
 733         if (!is_valid_ether_addr(dev->dev_addr))
 734                 return -EADDRNOTAVAIL;
 735
 736         err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
 737         if (err)
 738                 return err;
 739
 740         return ieee80211_do_open(&sdata->wdev, true);
 741 }
 742
 743 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
 744                               bool going_down)
 745 {
 746         struct ieee80211_local *local = sdata->local;
 747         unsigned long flags;
 748         struct sk_buff *skb, *tmp;
 749         u32 hw_reconf_flags = 0;
 750         int i, flushed;
 751         struct ps_data *ps;
 752
 753         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 754
 755         if (rcu_access_pointer(local->scan_sdata) == sdata)
 756                 ieee80211_scan_cancel(local);
 757
 758         /*
 759          * Stop TX on this interface first.
 760          */
 761         if (sdata->dev)
 762                 netif_tx_stop_all_queues(sdata->dev);
 763
 764         ieee80211_roc_purge(local, sdata);
 765
 766         if (sdata->vif.type == NL80211_IFTYPE_STATION)
 767                 ieee80211_mgd_stop(sdata);
 768
 769         /*
 770          * Remove all stations associated with this interface.
 771          *
 772          * This must be done before calling ops->remove_interface()
 773          * because otherwise we can later invoke ops->sta_notify()
 774          * whenever the STAs are removed, and that invalidates driver
 775          * assumptions about always getting a vif pointer that is valid
 776          * (because if we remove a STA after ops->remove_interface()
 777          * the driver will have removed the vif info already!)
 778          *
 779          * This is relevant only in WDS mode, in all other modes we've
 780          * already removed all stations when disconnecting or similar,
 781          * so warn otherwise.
 782          *
 783          * We call sta_info_flush_cleanup() later, to combine RCU waits.
 784          */
 785         flushed = sta_info_flush_defer(sdata);
 786         WARN_ON_ONCE((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) ||
 787                      (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1));
 788
 789         /* don't count this interface for promisc/allmulti while it is down */
 790         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 791                 atomic_dec(&local->iff_allmultis);
 792
 793         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 794                 atomic_dec(&local->iff_promiscs);
 795
 796         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 797                 local->fif_pspoll--;
 798                 local->fif_probe_req--;
 799         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 800                 local->fif_probe_req--;
 801         }
 802
 803         if (sdata->dev) {
 804                 netif_addr_lock_bh(sdata->dev);
 805                 spin_lock_bh(&local->filter_lock);
 806                 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
 807                                  sdata->dev->addr_len);
 808                 spin_unlock_bh(&local->filter_lock);
 809                 netif_addr_unlock_bh(sdata->dev);
 810         }
 811
 812         del_timer_sync(&local->dynamic_ps_timer);
 813         cancel_work_sync(&local->dynamic_ps_enable_work);
 814
 815         cancel_work_sync(&sdata->recalc_smps);
 816         sdata->vif.csa_active = false;
 817         cancel_work_sync(&sdata->csa_finalize_work);
 818
 819         cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
 820
 821         if (sdata->wdev.cac_started) {
 822                 WARN_ON(local->suspended);
 823                 mutex_lock(&local->iflist_mtx);
 824                 ieee80211_vif_release_channel(sdata);
 825                 mutex_unlock(&local->iflist_mtx);
 826                 cfg80211_cac_event(sdata->dev, NL80211_RADAR_CAC_ABORTED,
 827                                    GFP_KERNEL);
 828         }
 829
 830         /* APs need special treatment */
 831         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 832                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
 833
 834                 /* down all dependent devices, that is VLANs */
 835                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
 836                                          u.vlan.list)
 837                         dev_close(vlan->dev);
 838                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
 839         } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 840                 /* remove all packets in parent bc_buf pointing to this dev */
 841                 ps = &sdata->bss->ps;
 842
 843                 spin_lock_irqsave(&ps->bc_buf.lock, flags);
 844                 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
 845                         if (skb->dev == sdata->dev) {
 846                                 __skb_unlink(skb, &ps->bc_buf);
 847                                 local->total_ps_buffered--;
 848                                 ieee80211_free_txskb(&local->hw, skb);
 849                         }
 850                 }
 851                 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
 852         }
 853
 854         if (going_down)
 855                 local->open_count--;
 856
 857         switch (sdata->vif.type) {
 858         case NL80211_IFTYPE_AP_VLAN:
 859                 list_del(&sdata->u.vlan.list);
 860                 rcu_assign_pointer(sdata->vif.chanctx_conf, NULL);
 861                 /* no need to tell driver */
 862                 break;
 863         case NL80211_IFTYPE_MONITOR:
 864                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 865                         local->cooked_mntrs--;
 866                         break;
 867                 }
 868
 869                 local->monitors--;
 870                 if (local->monitors == 0) {
 871                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
 872                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 873                 }
 874
 875                 ieee80211_adjust_monitor_flags(sdata, -1);
 876                 break;
 877         case NL80211_IFTYPE_P2P_DEVICE:
 878                 /* relies on synchronize_rcu() below */
 879                 rcu_assign_pointer(local->p2p_sdata, NULL);
 880                 /* fall through */
 881         default:
 882                 cancel_work_sync(&sdata->work);
 883                 /*
 884                  * When we get here, the interface is marked down.
 885                  *
 886                  * sta_info_flush_cleanup() requires rcu_barrier()
 887                  * first to wait for the station call_rcu() calls
 888                  * to complete, and we also need synchronize_rcu()
 889                  * to wait for the RX path in case it is using the
 890                  * interface and enqueuing frames at this very time on
 891                  * another CPU.
 892                  */
 893                 synchronize_rcu();
 894                 rcu_barrier();
 895                 sta_info_flush_cleanup(sdata);
 896
 897                 /*
 898                  * Free all remaining keys, there shouldn't be any,
 899                  * except maybe in WDS mode?
 900                  */
 901                 ieee80211_free_keys(sdata);
 902
 903                 /* fall through */
 904         case NL80211_IFTYPE_AP:
 905                 skb_queue_purge(&sdata->skb_queue);
 906         }
 907
 908         sdata->bss = NULL;
 909
 910         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 911         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 912                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
 913                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 914                         if (info->control.vif == &sdata->vif) {
 915                                 __skb_unlink(skb, &local->pending[i]);
 916                                 ieee80211_free_txskb(&local->hw, skb);
 917                         }
 918                 }
 919         }
 920         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 921
 922         if (local->open_count == 0)
 923                 ieee80211_clear_tx_pending(local);
 924
 925         /*
 926          * If the interface goes down while suspended, presumably because
 927          * the device was unplugged and that happens before our resume,
 928          * then the driver is already unconfigured and the remainder of
 929          * this function isn't needed.
 930          * XXX: what about WoWLAN? If the device has software state, e.g.
 931          *      memory allocated, it might expect teardown commands from
 932          *      mac80211 here?
 933          */
 934         if (local->suspended) {
 935                 WARN_ON(local->wowlan);
 936                 WARN_ON(rtnl_dereference(local->monitor_sdata));
 937                 return;
 938         }
 939
 940         switch (sdata->vif.type) {
 941         case NL80211_IFTYPE_AP_VLAN:
 942                 break;
 943         case NL80211_IFTYPE_MONITOR:
 944                 if (local->monitors == 0)
 945                         ieee80211_del_virtual_monitor(local);
 946
 947                 mutex_lock(&local->mtx);
 948                 ieee80211_recalc_idle(local);
 949                 mutex_unlock(&local->mtx);
 950
 951                 if (!(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE))
 952                         break;
 953
 954                 /* fall through */
 955         default:
 956                 if (going_down)
 957                         drv_remove_interface(local, sdata);
 958         }
 959
 960         ieee80211_recalc_ps(local, -1);
 961
 962         if (local->open_count == 0) {
 963                 ieee80211_stop_device(local);
 964
 965                 /* no reconfiguring after stop! */
 966                 return;
 967         }
 968
 969         /* do after stop to avoid reconfiguring when we stop anyway */
 970         ieee80211_configure_filter(local);
 971         ieee80211_hw_config(local, hw_reconf_flags);
 972
 973         if (local->monitors == local->open_count)
 974                 ieee80211_add_virtual_monitor(local);
 975 }
 976
 977 static int ieee80211_stop(struct net_device *dev)
 978 {
 979         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 980
 981         ieee80211_do_stop(sdata, true);
 982
 983         return 0;
 984 }
 985
 986 static void ieee80211_set_multicast_list(struct net_device *dev)
 987 {
 988         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 989         struct ieee80211_local *local = sdata->local;
 990         int allmulti, promisc, sdata_allmulti, sdata_promisc;
 991
 992         allmulti = !!(dev->flags & IFF_ALLMULTI);
 993         promisc = !!(dev->flags & IFF_PROMISC);
 994         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
 995         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
 996
 997         if (allmulti != sdata_allmulti) {
 998                 if (dev->flags & IFF_ALLMULTI)
 999                         atomic_inc(&local->iff_allmultis);
1000                 else
1001                         atomic_dec(&local->iff_allmultis);
1002                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
1003         }
1004
1005         if (promisc != sdata_promisc) {
1006                 if (dev->flags & IFF_PROMISC)
1007                         atomic_inc(&local->iff_promiscs);
1008                 else
1009                         atomic_dec(&local->iff_promiscs);
1010                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
1011         }
1012
1013         /*
1014          * TODO: If somebody needs this on AP interfaces,
1015          *       it can be enabled easily but multicast
1016          *       addresses from VLANs need to be synced.
1017          */
1018         if (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1019             sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1020             sdata->vif.type != NL80211_IFTYPE_AP)
1021                 drv_set_multicast_list(local, sdata, &dev->mc);
1022
1023         spin_lock_bh(&local->filter_lock);
1024         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
1025         spin_unlock_bh(&local->filter_lock);
1026         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
1027 }
1028
1029 /*
1030  * Called when the netdev is removed or, by the code below, before
1031  * the interface type changes.
1032  */
1033 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
1034 {
1035         int flushed;
1036         int i;
1037
1038         /* free extra data */
1039         ieee80211_free_keys(sdata);
1040
1041         ieee80211_debugfs_remove_netdev(sdata);
1042
1043         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1044                 __skb_queue_purge(&sdata->fragments[i].skb_list);
1045         sdata->fragment_next = 0;
1046
1047         if (ieee80211_vif_is_mesh(&sdata->vif))
1048                 mesh_rmc_free(sdata);
1049
1050         flushed = sta_info_flush(sdata);
1051         WARN_ON(flushed);
1052 }
1053
1054 static void ieee80211_uninit(struct net_device *dev)
1055 {
1056         ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
1057 }
1058
1059 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
1060                                          struct sk_buff *skb)
1061 {
1062         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
1063 }
1064
1065 static const struct net_device_ops ieee80211_dataif_ops = {
1066         .ndo_open               = ieee80211_open,
1067         .ndo_stop               = ieee80211_stop,
1068         .ndo_uninit             = ieee80211_uninit,
1069         .ndo_start_xmit         = ieee80211_subif_start_xmit,
1070         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1071         .ndo_change_mtu         = ieee80211_change_mtu,
1072         .ndo_set_mac_address    = ieee80211_change_mac,
1073         .ndo_select_queue       = ieee80211_netdev_select_queue,
1074 };
1075
1076 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
1077                                           struct sk_buff *skb)
1078 {
1079         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1080         struct ieee80211_local *local = sdata->local;
1081         struct ieee80211_hdr *hdr;
1082         struct ieee80211_radiotap_header *rtap = (void *)skb->data;
1083
1084         if (local->hw.queues < IEEE80211_NUM_ACS)
1085                 return 0;
1086
1087         if (skb->len < 4 ||
1088             skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
1089                 return 0; /* doesn't matter, frame will be dropped */
1090
1091         hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
1092
1093         return ieee80211_select_queue_80211(sdata, skb, hdr);
1094 }
1095
1096 static const struct net_device_ops ieee80211_monitorif_ops = {
1097         .ndo_open               = ieee80211_open,
1098         .ndo_stop               = ieee80211_stop,
1099         .ndo_uninit             = ieee80211_uninit,
1100         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
1101         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1102         .ndo_change_mtu         = ieee80211_change_mtu,
1103         .ndo_set_mac_address    = ieee80211_change_mac,
1104         .ndo_select_queue       = ieee80211_monitor_select_queue,
1105 };
1106
1107 static void ieee80211_if_setup(struct net_device *dev)
1108 {
1109         ether_setup(dev);
1110         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1111         dev->netdev_ops = &ieee80211_dataif_ops;
1112         dev->destructor = free_netdev;
1113 }
1114
1115 static void ieee80211_iface_work(struct work_struct *work)
1116 {
1117         struct ieee80211_sub_if_data *sdata =
1118                 container_of(work, struct ieee80211_sub_if_data, work);
1119         struct ieee80211_local *local = sdata->local;
1120         struct sk_buff *skb;
1121         struct sta_info *sta;
1122         struct ieee80211_ra_tid *ra_tid;
1123
1124         if (!ieee80211_sdata_running(sdata))
1125                 return;
1126
1127         if (local->scanning)
1128                 return;
1129
1130         /*
1131          * ieee80211_queue_work() should have picked up most cases,
1132          * here we'll pick the rest.
1133          */
1134         if (WARN(local->suspended,
1135                  "interface work scheduled while going to suspend\n"))
1136                 return;
1137
1138         /* first process frames */
1139         while ((skb = skb_dequeue(&sdata->skb_queue))) {
1140                 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1141
1142                 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
1143                         ra_tid = (void *)&skb->cb;
1144                         ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
1145                                                  ra_tid->tid);
1146                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
1147                         ra_tid = (void *)&skb->cb;
1148                         ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
1149                                                 ra_tid->tid);
1150                 } else if (ieee80211_is_action(mgmt->frame_control) &&
1151                            mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1152                         int len = skb->len;
1153
1154                         mutex_lock(&local->sta_mtx);
1155                         sta = sta_info_get_bss(sdata, mgmt->sa);
1156                         if (sta) {
1157                                 switch (mgmt->u.action.u.addba_req.action_code) {
1158                                 case WLAN_ACTION_ADDBA_REQ:
1159                                         ieee80211_process_addba_request(
1160                                                         local, sta, mgmt, len);
1161                                         break;
1162                                 case WLAN_ACTION_ADDBA_RESP:
1163                                         ieee80211_process_addba_resp(local, sta,
1164                                                                      mgmt, len);
1165                                         break;
1166                                 case WLAN_ACTION_DELBA:
1167                                         ieee80211_process_delba(sdata, sta,
1168                                                                 mgmt, len);
1169                                         break;
1170                                 default:
1171                                         WARN_ON(1);
1172                                         break;
1173                                 }
1174                         }
1175                         mutex_unlock(&local->sta_mtx);
1176                 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1177                         struct ieee80211_hdr *hdr = (void *)mgmt;
1178                         /*
1179                          * So the frame isn't mgmt, but frame_control
1180                          * is at the right place anyway, of course, so
1181                          * the if statement is correct.
1182                          *
1183                          * Warn if we have other data frame types here,
1184                          * they must not get here.
1185                          */
1186                         WARN_ON(hdr->frame_control &
1187                                         cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1188                         WARN_ON(!(hdr->seq_ctrl &
1189                                         cpu_to_le16(IEEE80211_SCTL_FRAG)));
1190                         /*
1191                          * This was a fragment of a frame, received while
1192                          * a block-ack session was active. That cannot be
1193                          * right, so terminate the session.
1194                          */
1195                         mutex_lock(&local->sta_mtx);
1196                         sta = sta_info_get_bss(sdata, mgmt->sa);
1197                         if (sta) {
1198                                 u16 tid = *ieee80211_get_qos_ctl(hdr) &
1199                                                 IEEE80211_QOS_CTL_TID_MASK;
1200
1201                                 __ieee80211_stop_rx_ba_session(
1202                                         sta, tid, WLAN_BACK_RECIPIENT,
1203                                         WLAN_REASON_QSTA_REQUIRE_SETUP,
1204                                         true);
1205                         }
1206                         mutex_unlock(&local->sta_mtx);
1207                 } else switch (sdata->vif.type) {
1208                 case NL80211_IFTYPE_STATION:
1209                         ieee80211_sta_rx_queued_mgmt(sdata, skb);
1210                         break;
1211                 case NL80211_IFTYPE_ADHOC:
1212                         ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1213                         break;
1214                 case NL80211_IFTYPE_MESH_POINT:
1215                         if (!ieee80211_vif_is_mesh(&sdata->vif))
1216                                 break;
1217                         ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1218                         break;
1219                 default:
1220                         WARN(1, "frame for unexpected interface type");
1221                         break;
1222                 }
1223
1224                 kfree_skb(skb);
1225         }
1226
1227         /* then other type-dependent work */
1228         switch (sdata->vif.type) {
1229         case NL80211_IFTYPE_STATION:
1230                 ieee80211_sta_work(sdata);
1231                 break;
1232         case NL80211_IFTYPE_ADHOC:
1233                 ieee80211_ibss_work(sdata);
1234                 break;
1235         case NL80211_IFTYPE_MESH_POINT:
1236                 if (!ieee80211_vif_is_mesh(&sdata->vif))
1237                         break;
1238                 ieee80211_mesh_work(sdata);
1239                 break;
1240         default:
1241                 break;
1242         }
1243 }
1244
1245 static void ieee80211_recalc_smps_work(struct work_struct *work)
1246 {
1247         struct ieee80211_sub_if_data *sdata =
1248                 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1249
1250         ieee80211_recalc_smps(sdata);
1251 }
1252
1253 /*
1254  * Helper function to initialise an interface to a specific type.
1255  */
1256 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1257                                   enum nl80211_iftype type)
1258 {
1259         /* clear type-dependent union */
1260         memset(&sdata->u, 0, sizeof(sdata->u));
1261
1262         /* and set some type-dependent values */
1263         sdata->vif.type = type;
1264         sdata->vif.p2p = false;
1265         sdata->wdev.iftype = type;
1266
1267         sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1268         sdata->control_port_no_encrypt = false;
1269
1270         sdata->noack_map = 0;
1271
1272         /* only monitor/p2p-device differ */
1273         if (sdata->dev) {
1274                 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1275                 sdata->dev->type = ARPHRD_ETHER;
1276         }
1277
1278         skb_queue_head_init(&sdata->skb_queue);
1279         INIT_WORK(&sdata->work, ieee80211_iface_work);
1280         INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1281         INIT_WORK(&sdata->csa_finalize_work, ieee80211_csa_finalize_work);
1282
1283         switch (type) {
1284         case NL80211_IFTYPE_P2P_GO:
1285                 type = NL80211_IFTYPE_AP;
1286                 sdata->vif.type = type;
1287                 sdata->vif.p2p = true;
1288                 /* fall through */
1289         case NL80211_IFTYPE_AP:
1290                 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1291                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1292                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1293                 break;
1294         case NL80211_IFTYPE_P2P_CLIENT:
1295                 type = NL80211_IFTYPE_STATION;
1296                 sdata->vif.type = type;
1297                 sdata->vif.p2p = true;
1298                 /* fall through */
1299         case NL80211_IFTYPE_STATION:
1300                 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1301                 ieee80211_sta_setup_sdata(sdata);
1302                 break;
1303         case NL80211_IFTYPE_ADHOC:
1304                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1305                 ieee80211_ibss_setup_sdata(sdata);
1306                 break;
1307         case NL80211_IFTYPE_MESH_POINT:
1308                 if (ieee80211_vif_is_mesh(&sdata->vif))
1309                         ieee80211_mesh_init_sdata(sdata);
1310                 break;
1311         case NL80211_IFTYPE_MONITOR:
1312                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1313                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1314                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
1315                                       MONITOR_FLAG_OTHER_BSS;
1316                 break;
1317         case NL80211_IFTYPE_WDS:
1318                 sdata->vif.bss_conf.bssid = NULL;
1319                 break;
1320         case NL80211_IFTYPE_AP_VLAN:
1321                 break;
1322         case NL80211_IFTYPE_P2P_DEVICE:
1323                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1324                 break;
1325         case NL80211_IFTYPE_UNSPECIFIED:
1326         case NUM_NL80211_IFTYPES:
1327                 BUG();
1328                 break;
1329         }
1330
1331         ieee80211_debugfs_add_netdev(sdata);
1332 }
1333
1334 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1335                                            enum nl80211_iftype type)
1336 {
1337         struct ieee80211_local *local = sdata->local;
1338         int ret, err;
1339         enum nl80211_iftype internal_type = type;
1340         bool p2p = false;
1341
1342         ASSERT_RTNL();
1343
1344         if (!local->ops->change_interface)
1345                 return -EBUSY;
1346
1347         switch (sdata->vif.type) {
1348         case NL80211_IFTYPE_AP:
1349         case NL80211_IFTYPE_STATION:
1350         case NL80211_IFTYPE_ADHOC:
1351                 /*
1352                  * Could maybe also all others here?
1353                  * Just not sure how that interacts
1354                  * with the RX/config path e.g. for
1355                  * mesh.
1356                  */
1357                 break;
1358         default:
1359                 return -EBUSY;
1360         }
1361
1362         switch (type) {
1363         case NL80211_IFTYPE_AP:
1364         case NL80211_IFTYPE_STATION:
1365         case NL80211_IFTYPE_ADHOC:
1366                 /*
1367                  * Could probably support everything
1368                  * but WDS here (WDS do_open can fail
1369                  * under memory pressure, which this
1370                  * code isn't prepared to handle).
1371                  */
1372                 break;
1373         case NL80211_IFTYPE_P2P_CLIENT:
1374                 p2p = true;
1375                 internal_type = NL80211_IFTYPE_STATION;
1376                 break;
1377         case NL80211_IFTYPE_P2P_GO:
1378                 p2p = true;
1379                 internal_type = NL80211_IFTYPE_AP;
1380                 break;
1381         default:
1382                 return -EBUSY;
1383         }
1384
1385         ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1386         if (ret)
1387                 return ret;
1388
1389         ieee80211_do_stop(sdata, false);
1390
1391         ieee80211_teardown_sdata(sdata);
1392
1393         ret = drv_change_interface(local, sdata, internal_type, p2p);
1394         if (ret)
1395                 type = ieee80211_vif_type_p2p(&sdata->vif);
1396
1397         /*
1398          * Ignore return value here, there's not much we can do since
1399          * the driver changed the interface type internally already.
1400          * The warnings will hopefully make driver authors fix it :-)
1401          */
1402         ieee80211_check_queues(sdata, type);
1403
1404         ieee80211_setup_sdata(sdata, type);
1405
1406         err = ieee80211_do_open(&sdata->wdev, false);
1407         WARN(err, "type change: do_open returned %d", err);
1408
1409         return ret;
1410 }
1411
1412 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1413                              enum nl80211_iftype type)
1414 {
1415         int ret;
1416
1417         ASSERT_RTNL();
1418
1419         if (type == ieee80211_vif_type_p2p(&sdata->vif))
1420                 return 0;
1421
1422         if (ieee80211_sdata_running(sdata)) {
1423                 ret = ieee80211_runtime_change_iftype(sdata, type);
1424                 if (ret)
1425                         return ret;
1426         } else {
1427                 /* Purge and reset type-dependent state. */
1428                 ieee80211_teardown_sdata(sdata);
1429                 ieee80211_setup_sdata(sdata, type);
1430         }
1431
1432         /* reset some values that shouldn't be kept across type changes */
1433         sdata->drop_unencrypted = 0;
1434         if (type == NL80211_IFTYPE_STATION)
1435                 sdata->u.mgd.use_4addr = false;
1436
1437         return 0;
1438 }
1439
1440 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1441                                        u8 *perm_addr, enum nl80211_iftype type)
1442 {
1443         struct ieee80211_sub_if_data *sdata;
1444         u64 mask, start, addr, val, inc;
1445         u8 *m;
1446         u8 tmp_addr[ETH_ALEN];
1447         int i;
1448
1449         /* default ... something at least */
1450         memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1451
1452         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1453             local->hw.wiphy->n_addresses <= 1)
1454                 return;
1455
1456         mutex_lock(&local->iflist_mtx);
1457
1458         switch (type) {
1459         case NL80211_IFTYPE_MONITOR:
1460                 /* doesn't matter */
1461                 break;
1462         case NL80211_IFTYPE_WDS:
1463         case NL80211_IFTYPE_AP_VLAN:
1464                 /* match up with an AP interface */
1465                 list_for_each_entry(sdata, &local->interfaces, list) {
1466                         if (sdata->vif.type != NL80211_IFTYPE_AP)
1467                                 continue;
1468                         memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1469                         break;
1470                 }
1471                 /* keep default if no AP interface present */
1472                 break;
1473         case NL80211_IFTYPE_P2P_CLIENT:
1474         case NL80211_IFTYPE_P2P_GO:
1475                 if (local->hw.flags & IEEE80211_HW_P2P_DEV_ADDR_FOR_INTF) {
1476                         list_for_each_entry(sdata, &local->interfaces, list) {
1477                                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1478                                         continue;
1479                                 if (!ieee80211_sdata_running(sdata))
1480                                         continue;
1481                                 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1482                                 goto out_unlock;
1483                         }
1484                 }
1485                 /* otherwise fall through */
1486         default:
1487                 /* assign a new address if possible -- try n_addresses first */
1488                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1489                         bool used = false;
1490
1491                         list_for_each_entry(sdata, &local->interfaces, list) {
1492                                 if (memcmp(local->hw.wiphy->addresses[i].addr,
1493                                            sdata->vif.addr, ETH_ALEN) == 0) {
1494                                         used = true;
1495                                         break;
1496                                 }
1497                         }
1498
1499                         if (!used) {
1500                                 memcpy(perm_addr,
1501                                        local->hw.wiphy->addresses[i].addr,
1502                                        ETH_ALEN);
1503                                 break;
1504                         }
1505                 }
1506
1507                 /* try mask if available */
1508                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1509                         break;
1510
1511                 m = local->hw.wiphy->addr_mask;
1512                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1513                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1514                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1515
1516                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1517                         /* not a contiguous mask ... not handled now! */
1518                         pr_info("not contiguous\n");
1519                         break;
1520                 }
1521
1522                 /*
1523                  * Pick address of existing interface in case user changed
1524                  * MAC address manually, default to perm_addr.
1525                  */
1526                 m = local->hw.wiphy->perm_addr;
1527                 list_for_each_entry(sdata, &local->interfaces, list) {
1528                         if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
1529                                 continue;
1530                         m = sdata->vif.addr;
1531                         break;
1532                 }
1533                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1534                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1535                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1536
1537                 inc = 1ULL<<__ffs64(mask);
1538                 val = (start & mask);
1539                 addr = (start & ~mask) | (val & mask);
1540                 do {
1541                         bool used = false;
1542
1543                         tmp_addr[5] = addr >> 0*8;
1544                         tmp_addr[4] = addr >> 1*8;
1545                         tmp_addr[3] = addr >> 2*8;
1546                         tmp_addr[2] = addr >> 3*8;
1547                         tmp_addr[1] = addr >> 4*8;
1548                         tmp_addr[0] = addr >> 5*8;
1549
1550                         val += inc;
1551
1552                         list_for_each_entry(sdata, &local->interfaces, list) {
1553                                 if (memcmp(tmp_addr, sdata->vif.addr,
1554                                                         ETH_ALEN) == 0) {
1555                                         used = true;
1556                                         break;
1557                                 }
1558                         }
1559
1560                         if (!used) {
1561                                 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1562                                 break;
1563                         }
1564                         addr = (start & ~mask) | (val & mask);
1565                 } while (addr != start);
1566
1567                 break;
1568         }
1569
1570  out_unlock:
1571         mutex_unlock(&local->iflist_mtx);
1572 }
1573
1574 static void ieee80211_cleanup_sdata_stas_wk(struct work_struct *wk)
1575 {
1576         struct ieee80211_sub_if_data *sdata;
1577
1578         sdata = container_of(wk, struct ieee80211_sub_if_data, cleanup_stations_wk);
1579
1580         ieee80211_cleanup_sdata_stas(sdata);
1581 }
1582
1583 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1584                      struct wireless_dev **new_wdev, enum nl80211_iftype type,
1585                      struct vif_params *params)
1586 {
1587         struct net_device *ndev = NULL;
1588         struct ieee80211_sub_if_data *sdata = NULL;
1589         int ret, i;
1590         int txqs = 1;
1591
1592         ASSERT_RTNL();
1593
1594         if (type == NL80211_IFTYPE_P2P_DEVICE) {
1595                 struct wireless_dev *wdev;
1596
1597                 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1598                                 GFP_KERNEL);
1599                 if (!sdata)
1600                         return -ENOMEM;
1601                 wdev = &sdata->wdev;
1602
1603                 sdata->dev = NULL;
1604                 strlcpy(sdata->name, name, IFNAMSIZ);
1605                 ieee80211_assign_perm_addr(local, wdev->address, type);
1606                 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1607         } else {
1608                 if (local->hw.queues >= IEEE80211_NUM_ACS)
1609                         txqs = IEEE80211_NUM_ACS;
1610
1611                 ndev = alloc_netdev_mqs(sizeof(*sdata) +
1612                                         local->hw.vif_data_size,
1613                                         name, ieee80211_if_setup, txqs, 1);
1614                 if (!ndev)
1615                         return -ENOMEM;
1616                 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1617
1618                 ndev->needed_headroom = local->tx_headroom +
1619                                         4*6 /* four MAC addresses */
1620                                         + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1621                                         + 6 /* mesh */
1622                                         + 8 /* rfc1042/bridge tunnel */
1623                                         - ETH_HLEN /* ethernet hard_header_len */
1624                                         + IEEE80211_ENCRYPT_HEADROOM;
1625                 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1626
1627                 ret = dev_alloc_name(ndev, ndev->name);
1628                 if (ret < 0) {
1629                         free_netdev(ndev);
1630                         return ret;
1631                 }
1632
1633                 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1634                 memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1635                 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1636
1637                 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1638                 sdata = netdev_priv(ndev);
1639                 ndev->ieee80211_ptr = &sdata->wdev;
1640                 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1641                 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1642
1643                 sdata->dev = ndev;
1644         }
1645
1646         /* initialise type-independent data */
1647         sdata->wdev.wiphy = local->hw.wiphy;
1648         sdata->local = local;
1649
1650         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1651                 skb_queue_head_init(&sdata->fragments[i].skb_list);
1652
1653         INIT_LIST_HEAD(&sdata->key_list);
1654
1655         spin_lock_init(&sdata->cleanup_stations_lock);
1656         INIT_LIST_HEAD(&sdata->cleanup_stations);
1657         INIT_WORK(&sdata->cleanup_stations_wk, ieee80211_cleanup_sdata_stas_wk);
1658         INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
1659                           ieee80211_dfs_cac_timer_work);
1660         INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
1661                           ieee80211_delayed_tailroom_dec);
1662
1663         for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1664                 struct ieee80211_supported_band *sband;
1665                 sband = local->hw.wiphy->bands[i];
1666                 sdata->rc_rateidx_mask[i] =
1667                         sband ? (1 << sband->n_bitrates) - 1 : 0;
1668                 if (sband)
1669                         memcpy(sdata->rc_rateidx_mcs_mask[i],
1670                                sband->ht_cap.mcs.rx_mask,
1671                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1672                 else
1673                         memset(sdata->rc_rateidx_mcs_mask[i], 0,
1674                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1675         }
1676
1677         ieee80211_set_default_queues(sdata);
1678
1679         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1680         sdata->user_power_level = local->user_power_level;
1681
1682         /* setup type-dependent data */
1683         ieee80211_setup_sdata(sdata, type);
1684
1685         if (ndev) {
1686                 if (params) {
1687                         ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1688                         if (type == NL80211_IFTYPE_STATION)
1689                                 sdata->u.mgd.use_4addr = params->use_4addr;
1690                 }
1691
1692                 ndev->features |= local->hw.netdev_features;
1693
1694                 ret = register_netdevice(ndev);
1695                 if (ret) {
1696                         free_netdev(ndev);
1697                         return ret;
1698                 }
1699         }
1700
1701         mutex_lock(&local->iflist_mtx);
1702         list_add_tail_rcu(&sdata->list, &local->interfaces);
1703         mutex_unlock(&local->iflist_mtx);
1704
1705         if (new_wdev)
1706                 *new_wdev = &sdata->wdev;
1707
1708         return 0;
1709 }
1710
1711 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1712 {
1713         ASSERT_RTNL();
1714
1715         mutex_lock(&sdata->local->iflist_mtx);
1716         list_del_rcu(&sdata->list);
1717         mutex_unlock(&sdata->local->iflist_mtx);
1718
1719         synchronize_rcu();
1720
1721         if (sdata->dev) {
1722                 unregister_netdevice(sdata->dev);
1723         } else {
1724                 cfg80211_unregister_wdev(&sdata->wdev);
1725                 kfree(sdata);
1726         }
1727 }
1728
1729 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
1730 {
1731         if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
1732                 return;
1733         ieee80211_do_stop(sdata, true);
1734         ieee80211_teardown_sdata(sdata);
1735 }
1736
1737 /*
1738  * Remove all interfaces, may only be called at hardware unregistration
1739  * time because it doesn't do RCU-safe list removals.
1740  */
1741 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1742 {
1743         struct ieee80211_sub_if_data *sdata, *tmp;
1744         LIST_HEAD(unreg_list);
1745         LIST_HEAD(wdev_list);
1746
1747         ASSERT_RTNL();
1748
1749         /*
1750          * Close all AP_VLAN interfaces first, as otherwise they
1751          * might be closed while the AP interface they belong to
1752          * is closed, causing unregister_netdevice_many() to crash.
1753          */
1754         list_for_each_entry(sdata, &local->interfaces, list)
1755                 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1756                         dev_close(sdata->dev);
1757
1758         mutex_lock(&local->iflist_mtx);
1759         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1760                 list_del(&sdata->list);
1761
1762                 if (sdata->dev)
1763                         unregister_netdevice_queue(sdata->dev, &unreg_list);
1764                 else
1765                         list_add(&sdata->list, &wdev_list);
1766         }
1767         mutex_unlock(&local->iflist_mtx);
1768         unregister_netdevice_many(&unreg_list);
1769         list_del(&unreg_list);
1770
1771         list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
1772                 list_del(&sdata->list);
1773                 cfg80211_unregister_wdev(&sdata->wdev);
1774                 kfree(sdata);
1775         }
1776 }
1777
1778 static int netdev_notify(struct notifier_block *nb,
1779                          unsigned long state, void *ptr)
1780 {
1781         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1782         struct ieee80211_sub_if_data *sdata;
1783
1784         if (state != NETDEV_CHANGENAME)
1785                 return 0;
1786
1787         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1788                 return 0;
1789
1790         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1791                 return 0;
1792
1793         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1794
1795         memcpy(sdata->name, dev->name, IFNAMSIZ);
1796
1797         ieee80211_debugfs_rename_netdev(sdata);
1798         return 0;
1799 }
1800
1801 static struct notifier_block mac80211_netdev_notifier = {
1802         .notifier_call = netdev_notify,
1803 };
1804
1805 int ieee80211_iface_init(void)
1806 {
1807         return register_netdevice_notifier(&mac80211_netdev_notifier);
1808 }
1809
1810 void ieee80211_iface_exit(void)
1811 {
1812         unregister_netdevice_notifier(&mac80211_netdev_notifier);
1813 }