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         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
 405
 406         ieee80211_set_default_queues(sdata);
 407
 408         ret = drv_add_interface(local, sdata);
 409         if (WARN_ON(ret)) {
 410                 /* ok .. stupid driver, it asked for this! */
 411                 kfree(sdata);
 412                 return ret;
 413         }
 414
 415         ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR);
 416         if (ret) {
 417                 kfree(sdata);
 418                 return ret;
 419         }
 420
 421         mutex_lock(&local->iflist_mtx);
 422         rcu_assign_pointer(local->monitor_sdata, sdata);
 423         mutex_unlock(&local->iflist_mtx);
 424
 425         mutex_lock(&local->mtx);
 426         ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef,
 427                                         IEEE80211_CHANCTX_EXCLUSIVE);
 428         mutex_unlock(&local->mtx);
 429         if (ret) {
 430                 mutex_lock(&local->iflist_mtx);
 431                 rcu_assign_pointer(local->monitor_sdata, NULL);
 432                 mutex_unlock(&local->iflist_mtx);
 433                 synchronize_net();
 434                 drv_remove_interface(local, sdata);
 435                 kfree(sdata);
 436                 return ret;
 437         }
 438
 439         return 0;
 440 }
 441
 442 void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
 443 {
 444         struct ieee80211_sub_if_data *sdata;
 445
 446         if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
 447                 return;
 448
 449         ASSERT_RTNL();
 450
 451         mutex_lock(&local->iflist_mtx);
 452
 453         sdata = rcu_dereference_protected(local->monitor_sdata,
 454                                           lockdep_is_held(&local->iflist_mtx));
 455         if (!sdata) {
 456                 mutex_unlock(&local->iflist_mtx);
 457                 return;
 458         }
 459
 460         rcu_assign_pointer(local->monitor_sdata, NULL);
 461         mutex_unlock(&local->iflist_mtx);
 462
 463         synchronize_net();
 464
 465         mutex_lock(&local->mtx);
 466         ieee80211_vif_release_channel(sdata);
 467         mutex_unlock(&local->mtx);
 468
 469         drv_remove_interface(local, sdata);
 470
 471         kfree(sdata);
 472 }
 473
 474 /*
 475  * NOTE: Be very careful when changing this function, it must NOT return
 476  * an error on interface type changes that have been pre-checked, so most
 477  * checks should be in ieee80211_check_concurrent_iface.
 478  */
 479 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
 480 {
 481         struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
 482         struct net_device *dev = wdev->netdev;
 483         struct ieee80211_local *local = sdata->local;
 484         struct sta_info *sta;
 485         u32 changed = 0;
 486         int res;
 487         u32 hw_reconf_flags = 0;
 488
 489         switch (sdata->vif.type) {
 490         case NL80211_IFTYPE_WDS:
 491                 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
 492                         return -ENOLINK;
 493                 break;
 494         case NL80211_IFTYPE_AP_VLAN: {
 495                 struct ieee80211_sub_if_data *master;
 496
 497                 if (!sdata->bss)
 498                         return -ENOLINK;
 499
 500                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
 501
 502                 master = container_of(sdata->bss,
 503                                       struct ieee80211_sub_if_data, u.ap);
 504                 sdata->control_port_protocol =
 505                         master->control_port_protocol;
 506                 sdata->control_port_no_encrypt =
 507                         master->control_port_no_encrypt;
 508                 sdata->vif.cab_queue = master->vif.cab_queue;
 509                 memcpy(sdata->vif.hw_queue, master->vif.hw_queue,
 510                        sizeof(sdata->vif.hw_queue));
 511                 break;
 512                 }
 513         case NL80211_IFTYPE_AP:
 514                 sdata->bss = &sdata->u.ap;
 515                 break;
 516         case NL80211_IFTYPE_MESH_POINT:
 517         case NL80211_IFTYPE_STATION:
 518         case NL80211_IFTYPE_MONITOR:
 519         case NL80211_IFTYPE_ADHOC:
 520         case NL80211_IFTYPE_P2P_DEVICE:
 521                 /* no special treatment */
 522                 break;
 523         case NL80211_IFTYPE_UNSPECIFIED:
 524         case NUM_NL80211_IFTYPES:
 525         case NL80211_IFTYPE_P2P_CLIENT:
 526         case NL80211_IFTYPE_P2P_GO:
 527                 /* cannot happen */
 528                 WARN_ON(1);
 529                 break;
 530         }
 531
 532         if (local->open_count == 0) {
 533                 res = drv_start(local);
 534                 if (res)
 535                         goto err_del_bss;
 536                 /* we're brought up, everything changes */
 537                 hw_reconf_flags = ~0;
 538                 ieee80211_led_radio(local, true);
 539                 ieee80211_mod_tpt_led_trig(local,
 540                                            IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
 541         }
 542
 543         /*
 544          * Copy the hopefully now-present MAC address to
 545          * this interface, if it has the special null one.
 546          */
 547         if (dev && is_zero_ether_addr(dev->dev_addr)) {
 548                 memcpy(dev->dev_addr,
 549                        local->hw.wiphy->perm_addr,
 550                        ETH_ALEN);
 551                 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
 552
 553                 if (!is_valid_ether_addr(dev->dev_addr)) {
 554                         res = -EADDRNOTAVAIL;
 555                         goto err_stop;
 556                 }
 557         }
 558
 559         switch (sdata->vif.type) {
 560         case NL80211_IFTYPE_AP_VLAN:
 561                 /* no need to tell driver, but set carrier and chanctx */
 562                 if (rtnl_dereference(sdata->bss->beacon)) {
 563                         ieee80211_vif_vlan_copy_chanctx(sdata);
 564                         netif_carrier_on(dev);
 565                 } else {
 566                         netif_carrier_off(dev);
 567                 }
 568                 break;
 569         case NL80211_IFTYPE_MONITOR:
 570                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 571                         local->cooked_mntrs++;
 572                         break;
 573                 }
 574
 575                 if (sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE) {
 576                         res = drv_add_interface(local, sdata);
 577                         if (res)
 578                                 goto err_stop;
 579                 } else if (local->monitors == 0 && local->open_count == 0) {
 580                         res = ieee80211_add_virtual_monitor(local);
 581                         if (res)
 582                                 goto err_stop;
 583                 }
 584
 585                 /* must be before the call to ieee80211_configure_filter */
 586                 local->monitors++;
 587                 if (local->monitors == 1) {
 588                         local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
 589                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 590                 }
 591
 592                 ieee80211_adjust_monitor_flags(sdata, 1);
 593                 ieee80211_configure_filter(local);
 594                 mutex_lock(&local->mtx);
 595                 ieee80211_recalc_idle(local);
 596                 mutex_unlock(&local->mtx);
 597
 598                 netif_carrier_on(dev);
 599                 break;
 600         default:
 601                 if (coming_up) {
 602                         ieee80211_del_virtual_monitor(local);
 603
 604                         res = drv_add_interface(local, sdata);
 605                         if (res)
 606                                 goto err_stop;
 607                         res = ieee80211_check_queues(sdata,
 608                                 ieee80211_vif_type_p2p(&sdata->vif));
 609                         if (res)
 610                                 goto err_del_interface;
 611                 }
 612
 613                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
 614                         local->fif_pspoll++;
 615                         local->fif_probe_req++;
 616
 617                         ieee80211_configure_filter(local);
 618                 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 619                         local->fif_probe_req++;
 620                 }
 621
 622                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
 623                         changed |= ieee80211_reset_erp_info(sdata);
 624                 ieee80211_bss_info_change_notify(sdata, changed);
 625
 626                 switch (sdata->vif.type) {
 627                 case NL80211_IFTYPE_STATION:
 628                 case NL80211_IFTYPE_ADHOC:
 629                 case NL80211_IFTYPE_AP:
 630                 case NL80211_IFTYPE_MESH_POINT:
 631                         netif_carrier_off(dev);
 632                         break;
 633                 case NL80211_IFTYPE_WDS:
 634                 case NL80211_IFTYPE_P2P_DEVICE:
 635                         break;
 636                 default:
 637                         /* not reached */
 638                         WARN_ON(1);
 639                 }
 640
 641                 /*
 642                  * set default queue parameters so drivers don't
 643                  * need to initialise the hardware if the hardware
 644                  * doesn't start up with sane defaults
 645                  */
 646                 ieee80211_set_wmm_default(sdata, true);
 647         }
 648
 649         set_bit(SDATA_STATE_RUNNING, &sdata->state);
 650
 651         if (sdata->vif.type == NL80211_IFTYPE_WDS) {
 652                 /* Create STA entry for the WDS peer */
 653                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
 654                                      GFP_KERNEL);
 655                 if (!sta) {
 656                         res = -ENOMEM;
 657                         goto err_del_interface;
 658                 }
 659
 660                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
 661                 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
 662                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
 663
 664                 res = sta_info_insert(sta);
 665                 if (res) {
 666                         /* STA has been freed */
 667                         goto err_del_interface;
 668                 }
 669
 670                 rate_control_rate_init(sta);
 671                 netif_carrier_on(dev);
 672         } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
 673                 rcu_assign_pointer(local->p2p_sdata, sdata);
 674         }
 675
 676         /*
 677          * set_multicast_list will be invoked by the networking core
 678          * which will check whether any increments here were done in
 679          * error and sync them down to the hardware as filter flags.
 680          */
 681         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 682                 atomic_inc(&local->iff_allmultis);
 683
 684         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 685                 atomic_inc(&local->iff_promiscs);
 686
 687         if (coming_up)
 688                 local->open_count++;
 689
 690         if (hw_reconf_flags)
 691                 ieee80211_hw_config(local, hw_reconf_flags);
 692
 693         ieee80211_recalc_ps(local, -1);
 694
 695         if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
 696             sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 697                 /* XXX: for AP_VLAN, actually track AP queues */
 698                 netif_tx_start_all_queues(dev);
 699         } else if (dev) {
 700                 unsigned long flags;
 701                 int n_acs = IEEE80211_NUM_ACS;
 702                 int ac;
 703
 704                 if (local->hw.queues < IEEE80211_NUM_ACS)
 705                         n_acs = 1;
 706
 707                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 708                 if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE ||
 709                     (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 &&
 710                      skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) {
 711                         for (ac = 0; ac < n_acs; ac++) {
 712                                 int ac_queue = sdata->vif.hw_queue[ac];
 713
 714                                 if (local->queue_stop_reasons[ac_queue] == 0 &&
 715                                     skb_queue_empty(&local->pending[ac_queue]))
 716                                         netif_start_subqueue(dev, ac);
 717                         }
 718                 }
 719                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 720         }
 721
 722         return 0;
 723  err_del_interface:
 724         drv_remove_interface(local, sdata);
 725  err_stop:
 726         if (!local->open_count)
 727                 drv_stop(local);
 728  err_del_bss:
 729         sdata->bss = NULL;
 730         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
 731                 list_del(&sdata->u.vlan.list);
 732         /* might already be clear but that doesn't matter */
 733         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 734         return res;
 735 }
 736
 737 static int ieee80211_open(struct net_device *dev)
 738 {
 739         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 740         int err;
 741
 742         /* fail early if user set an invalid address */
 743         if (!is_valid_ether_addr(dev->dev_addr))
 744                 return -EADDRNOTAVAIL;
 745
 746         err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
 747         if (err)
 748                 return err;
 749
 750         return ieee80211_do_open(&sdata->wdev, true);
 751 }
 752
 753 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
 754                               bool going_down)
 755 {
 756         struct ieee80211_local *local = sdata->local;
 757         unsigned long flags;
 758         struct sk_buff *skb, *tmp;
 759         u32 hw_reconf_flags = 0;
 760         int i, flushed;
 761         struct ps_data *ps;
 762         struct cfg80211_chan_def chandef;
 763
 764         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 765
 766         if (rcu_access_pointer(local->scan_sdata) == sdata)
 767                 ieee80211_scan_cancel(local);
 768
 769         /*
 770          * Stop TX on this interface first.
 771          */
 772         if (sdata->dev)
 773                 netif_tx_stop_all_queues(sdata->dev);
 774
 775         ieee80211_roc_purge(local, sdata);
 776
 777         switch (sdata->vif.type) {
 778         case NL80211_IFTYPE_STATION:
 779                 ieee80211_mgd_stop(sdata);
 780                 break;
 781         case NL80211_IFTYPE_ADHOC:
 782                 ieee80211_ibss_stop(sdata);
 783                 break;
 784         case NL80211_IFTYPE_AP:
 785                 cancel_work_sync(&sdata->u.ap.request_smps_work);
 786                 break;
 787         default:
 788                 break;
 789         }
 790
 791         /*
 792          * Remove all stations associated with this interface.
 793          *
 794          * This must be done before calling ops->remove_interface()
 795          * because otherwise we can later invoke ops->sta_notify()
 796          * whenever the STAs are removed, and that invalidates driver
 797          * assumptions about always getting a vif pointer that is valid
 798          * (because if we remove a STA after ops->remove_interface()
 799          * the driver will have removed the vif info already!)
 800          *
 801          * This is relevant only in WDS mode, in all other modes we've
 802          * already removed all stations when disconnecting or similar,
 803          * so warn otherwise.
 804          */
 805         flushed = sta_info_flush(sdata);
 806         WARN_ON_ONCE((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) ||
 807                      (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1));
 808
 809         /* don't count this interface for promisc/allmulti while it is down */
 810         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 811                 atomic_dec(&local->iff_allmultis);
 812
 813         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 814                 atomic_dec(&local->iff_promiscs);
 815
 816         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 817                 local->fif_pspoll--;
 818                 local->fif_probe_req--;
 819         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 820                 local->fif_probe_req--;
 821         }
 822
 823         if (sdata->dev) {
 824                 netif_addr_lock_bh(sdata->dev);
 825                 spin_lock_bh(&local->filter_lock);
 826                 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
 827                                  sdata->dev->addr_len);
 828                 spin_unlock_bh(&local->filter_lock);
 829                 netif_addr_unlock_bh(sdata->dev);
 830         }
 831
 832         del_timer_sync(&local->dynamic_ps_timer);
 833         cancel_work_sync(&local->dynamic_ps_enable_work);
 834
 835         cancel_work_sync(&sdata->recalc_smps);
 836         sdata->vif.csa_active = false;
 837         cancel_work_sync(&sdata->csa_finalize_work);
 838
 839         cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
 840
 841         if (sdata->wdev.cac_started) {
 842                 chandef = sdata->vif.bss_conf.chandef;
 843                 WARN_ON(local->suspended);
 844                 mutex_lock(&local->mtx);
 845                 ieee80211_vif_release_channel(sdata);
 846                 mutex_unlock(&local->mtx);
 847                 cfg80211_cac_event(sdata->dev, &chandef,
 848                                    NL80211_RADAR_CAC_ABORTED,
 849                                    GFP_KERNEL);
 850         }
 851
 852         /* APs need special treatment */
 853         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 854                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
 855
 856                 /* down all dependent devices, that is VLANs */
 857                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
 858                                          u.vlan.list)
 859                         dev_close(vlan->dev);
 860                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
 861         } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 862                 /* remove all packets in parent bc_buf pointing to this dev */
 863                 ps = &sdata->bss->ps;
 864
 865                 spin_lock_irqsave(&ps->bc_buf.lock, flags);
 866                 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
 867                         if (skb->dev == sdata->dev) {
 868                                 __skb_unlink(skb, &ps->bc_buf);
 869                                 local->total_ps_buffered--;
 870                                 ieee80211_free_txskb(&local->hw, skb);
 871                         }
 872                 }
 873                 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
 874         }
 875
 876         if (going_down)
 877                 local->open_count--;
 878
 879         switch (sdata->vif.type) {
 880         case NL80211_IFTYPE_AP_VLAN:
 881                 list_del(&sdata->u.vlan.list);
 882                 rcu_assign_pointer(sdata->vif.chanctx_conf, NULL);
 883                 /* no need to tell driver */
 884                 break;
 885         case NL80211_IFTYPE_MONITOR:
 886                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 887                         local->cooked_mntrs--;
 888                         break;
 889                 }
 890
 891                 local->monitors--;
 892                 if (local->monitors == 0) {
 893                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
 894                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 895                 }
 896
 897                 ieee80211_adjust_monitor_flags(sdata, -1);
 898                 break;
 899         case NL80211_IFTYPE_P2P_DEVICE:
 900                 /* relies on synchronize_rcu() below */
 901                 rcu_assign_pointer(local->p2p_sdata, NULL);
 902                 /* fall through */
 903         default:
 904                 cancel_work_sync(&sdata->work);
 905                 /*
 906                  * When we get here, the interface is marked down.
 907                  * Free the remaining keys, if there are any
 908                  * (shouldn't be, except maybe in WDS mode?)
 909                  *
 910                  * Force the key freeing to always synchronize_net()
 911                  * to wait for the RX path in case it is using this
 912                  * interface enqueuing frames * at this very time on
 913                  * another CPU.
 914                  */
 915                 ieee80211_free_keys(sdata, true);
 916
 917                 /* fall through */
 918         case NL80211_IFTYPE_AP:
 919                 skb_queue_purge(&sdata->skb_queue);
 920         }
 921
 922         sdata->bss = NULL;
 923
 924         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 925         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 926                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
 927                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 928                         if (info->control.vif == &sdata->vif) {
 929                                 __skb_unlink(skb, &local->pending[i]);
 930                                 ieee80211_free_txskb(&local->hw, skb);
 931                         }
 932                 }
 933         }
 934         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 935
 936         if (local->open_count == 0)
 937                 ieee80211_clear_tx_pending(local);
 938
 939         /*
 940          * If the interface goes down while suspended, presumably because
 941          * the device was unplugged and that happens before our resume,
 942          * then the driver is already unconfigured and the remainder of
 943          * this function isn't needed.
 944          * XXX: what about WoWLAN? If the device has software state, e.g.
 945          *      memory allocated, it might expect teardown commands from
 946          *      mac80211 here?
 947          */
 948         if (local->suspended) {
 949                 WARN_ON(local->wowlan);
 950                 WARN_ON(rtnl_dereference(local->monitor_sdata));
 951                 return;
 952         }
 953
 954         switch (sdata->vif.type) {
 955         case NL80211_IFTYPE_AP_VLAN:
 956                 break;
 957         case NL80211_IFTYPE_MONITOR:
 958                 if (local->monitors == 0)
 959                         ieee80211_del_virtual_monitor(local);
 960
 961                 mutex_lock(&local->mtx);
 962                 ieee80211_recalc_idle(local);
 963                 mutex_unlock(&local->mtx);
 964
 965                 if (!(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE))
 966                         break;
 967
 968                 /* fall through */
 969         default:
 970                 if (going_down)
 971                         drv_remove_interface(local, sdata);
 972         }
 973
 974         ieee80211_recalc_ps(local, -1);
 975
 976         if (local->open_count == 0) {
 977                 ieee80211_stop_device(local);
 978
 979                 /* no reconfiguring after stop! */
 980                 return;
 981         }
 982
 983         /* do after stop to avoid reconfiguring when we stop anyway */
 984         ieee80211_configure_filter(local);
 985         ieee80211_hw_config(local, hw_reconf_flags);
 986
 987         if (local->monitors == local->open_count)
 988                 ieee80211_add_virtual_monitor(local);
 989 }
 990
 991 static int ieee80211_stop(struct net_device *dev)
 992 {
 993         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 994
 995         ieee80211_do_stop(sdata, true);
 996
 997         return 0;
 998 }
 999
1000 static void ieee80211_set_multicast_list(struct net_device *dev)
1001 {
1002         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1003         struct ieee80211_local *local = sdata->local;
1004         int allmulti, promisc, sdata_allmulti, sdata_promisc;
1005
1006         allmulti = !!(dev->flags & IFF_ALLMULTI);
1007         promisc = !!(dev->flags & IFF_PROMISC);
1008         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
1009         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
1010
1011         if (allmulti != sdata_allmulti) {
1012                 if (dev->flags & IFF_ALLMULTI)
1013                         atomic_inc(&local->iff_allmultis);
1014                 else
1015                         atomic_dec(&local->iff_allmultis);
1016                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
1017         }
1018
1019         if (promisc != sdata_promisc) {
1020                 if (dev->flags & IFF_PROMISC)
1021                         atomic_inc(&local->iff_promiscs);
1022                 else
1023                         atomic_dec(&local->iff_promiscs);
1024                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
1025         }
1026         spin_lock_bh(&local->filter_lock);
1027         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
1028         spin_unlock_bh(&local->filter_lock);
1029         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
1030 }
1031
1032 /*
1033  * Called when the netdev is removed or, by the code below, before
1034  * the interface type changes.
1035  */
1036 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
1037 {
1038         int i;
1039
1040         /* free extra data */
1041         ieee80211_free_keys(sdata, false);
1042
1043         ieee80211_debugfs_remove_netdev(sdata);
1044
1045         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1046                 __skb_queue_purge(&sdata->fragments[i].skb_list);
1047         sdata->fragment_next = 0;
1048
1049         if (ieee80211_vif_is_mesh(&sdata->vif))
1050                 mesh_rmc_free(sdata);
1051 }
1052
1053 static void ieee80211_uninit(struct net_device *dev)
1054 {
1055         ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
1056 }
1057
1058 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
1059                                          struct sk_buff *skb,
1060                                          void *accel_priv,
1061                                          select_queue_fallback_t fallback)
1062 {
1063         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
1064 }
1065
1066 static const struct net_device_ops ieee80211_dataif_ops = {
1067         .ndo_open               = ieee80211_open,
1068         .ndo_stop               = ieee80211_stop,
1069         .ndo_uninit             = ieee80211_uninit,
1070         .ndo_start_xmit         = ieee80211_subif_start_xmit,
1071         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1072         .ndo_change_mtu         = ieee80211_change_mtu,
1073         .ndo_set_mac_address    = ieee80211_change_mac,
1074         .ndo_select_queue       = ieee80211_netdev_select_queue,
1075 };
1076
1077 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
1078                                           struct sk_buff *skb,
1079                                           void *accel_priv,
1080                                           select_queue_fallback_t fallback)
1081 {
1082         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1083         struct ieee80211_local *local = sdata->local;
1084         struct ieee80211_hdr *hdr;
1085         struct ieee80211_radiotap_header *rtap = (void *)skb->data;
1086
1087         if (local->hw.queues < IEEE80211_NUM_ACS)
1088                 return 0;
1089
1090         if (skb->len < 4 ||
1091             skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
1092                 return 0; /* doesn't matter, frame will be dropped */
1093
1094         hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
1095
1096         return ieee80211_select_queue_80211(sdata, skb, hdr);
1097 }
1098
1099 static const struct net_device_ops ieee80211_monitorif_ops = {
1100         .ndo_open               = ieee80211_open,
1101         .ndo_stop               = ieee80211_stop,
1102         .ndo_uninit             = ieee80211_uninit,
1103         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
1104         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1105         .ndo_change_mtu         = ieee80211_change_mtu,
1106         .ndo_set_mac_address    = ieee80211_change_mac,
1107         .ndo_select_queue       = ieee80211_monitor_select_queue,
1108 };
1109
1110 static void ieee80211_if_setup(struct net_device *dev)
1111 {
1112         ether_setup(dev);
1113         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1114         dev->netdev_ops = &ieee80211_dataif_ops;
1115         dev->destructor = free_netdev;
1116 }
1117
1118 static void ieee80211_iface_work(struct work_struct *work)
1119 {
1120         struct ieee80211_sub_if_data *sdata =
1121                 container_of(work, struct ieee80211_sub_if_data, work);
1122         struct ieee80211_local *local = sdata->local;
1123         struct sk_buff *skb;
1124         struct sta_info *sta;
1125         struct ieee80211_ra_tid *ra_tid;
1126
1127         if (!ieee80211_sdata_running(sdata))
1128                 return;
1129
1130         if (local->scanning)
1131                 return;
1132
1133         /*
1134          * ieee80211_queue_work() should have picked up most cases,
1135          * here we'll pick the rest.
1136          */
1137         if (WARN(local->suspended,
1138                  "interface work scheduled while going to suspend\n"))
1139                 return;
1140
1141         /* first process frames */
1142         while ((skb = skb_dequeue(&sdata->skb_queue))) {
1143                 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1144
1145                 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
1146                         ra_tid = (void *)&skb->cb;
1147                         ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
1148                                                  ra_tid->tid);
1149                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
1150                         ra_tid = (void *)&skb->cb;
1151                         ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
1152                                                 ra_tid->tid);
1153                 } else if (ieee80211_is_action(mgmt->frame_control) &&
1154                            mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1155                         int len = skb->len;
1156
1157                         mutex_lock(&local->sta_mtx);
1158                         sta = sta_info_get_bss(sdata, mgmt->sa);
1159                         if (sta) {
1160                                 switch (mgmt->u.action.u.addba_req.action_code) {
1161                                 case WLAN_ACTION_ADDBA_REQ:
1162                                         ieee80211_process_addba_request(
1163                                                         local, sta, mgmt, len);
1164                                         break;
1165                                 case WLAN_ACTION_ADDBA_RESP:
1166                                         ieee80211_process_addba_resp(local, sta,
1167                                                                      mgmt, len);
1168                                         break;
1169                                 case WLAN_ACTION_DELBA:
1170                                         ieee80211_process_delba(sdata, sta,
1171                                                                 mgmt, len);
1172                                         break;
1173                                 default:
1174                                         WARN_ON(1);
1175                                         break;
1176                                 }
1177                         }
1178                         mutex_unlock(&local->sta_mtx);
1179                 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1180                         struct ieee80211_hdr *hdr = (void *)mgmt;
1181                         /*
1182                          * So the frame isn't mgmt, but frame_control
1183                          * is at the right place anyway, of course, so
1184                          * the if statement is correct.
1185                          *
1186                          * Warn if we have other data frame types here,
1187                          * they must not get here.
1188                          */
1189                         WARN_ON(hdr->frame_control &
1190                                         cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1191                         WARN_ON(!(hdr->seq_ctrl &
1192                                         cpu_to_le16(IEEE80211_SCTL_FRAG)));
1193                         /*
1194                          * This was a fragment of a frame, received while
1195                          * a block-ack session was active. That cannot be
1196                          * right, so terminate the session.
1197                          */
1198                         mutex_lock(&local->sta_mtx);
1199                         sta = sta_info_get_bss(sdata, mgmt->sa);
1200                         if (sta) {
1201                                 u16 tid = *ieee80211_get_qos_ctl(hdr) &
1202                                                 IEEE80211_QOS_CTL_TID_MASK;
1203
1204                                 __ieee80211_stop_rx_ba_session(
1205                                         sta, tid, WLAN_BACK_RECIPIENT,
1206                                         WLAN_REASON_QSTA_REQUIRE_SETUP,
1207                                         true);
1208                         }
1209                         mutex_unlock(&local->sta_mtx);
1210                 } else switch (sdata->vif.type) {
1211                 case NL80211_IFTYPE_STATION:
1212                         ieee80211_sta_rx_queued_mgmt(sdata, skb);
1213                         break;
1214                 case NL80211_IFTYPE_ADHOC:
1215                         ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1216                         break;
1217                 case NL80211_IFTYPE_MESH_POINT:
1218                         if (!ieee80211_vif_is_mesh(&sdata->vif))
1219                                 break;
1220                         ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1221                         break;
1222                 default:
1223                         WARN(1, "frame for unexpected interface type");
1224                         break;
1225                 }
1226
1227                 kfree_skb(skb);
1228         }
1229
1230         /* then other type-dependent work */
1231         switch (sdata->vif.type) {
1232         case NL80211_IFTYPE_STATION:
1233                 ieee80211_sta_work(sdata);
1234                 break;
1235         case NL80211_IFTYPE_ADHOC:
1236                 ieee80211_ibss_work(sdata);
1237                 break;
1238         case NL80211_IFTYPE_MESH_POINT:
1239                 if (!ieee80211_vif_is_mesh(&sdata->vif))
1240                         break;
1241                 ieee80211_mesh_work(sdata);
1242                 break;
1243         default:
1244                 break;
1245         }
1246 }
1247
1248 static void ieee80211_recalc_smps_work(struct work_struct *work)
1249 {
1250         struct ieee80211_sub_if_data *sdata =
1251                 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1252
1253         ieee80211_recalc_smps(sdata);
1254 }
1255
1256 /*
1257  * Helper function to initialise an interface to a specific type.
1258  */
1259 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1260                                   enum nl80211_iftype type)
1261 {
1262         /* clear type-dependent union */
1263         memset(&sdata->u, 0, sizeof(sdata->u));
1264
1265         /* and set some type-dependent values */
1266         sdata->vif.type = type;
1267         sdata->vif.p2p = false;
1268         sdata->wdev.iftype = type;
1269
1270         sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1271         sdata->control_port_no_encrypt = false;
1272         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1273
1274         sdata->noack_map = 0;
1275
1276         /* only monitor/p2p-device differ */
1277         if (sdata->dev) {
1278                 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1279                 sdata->dev->type = ARPHRD_ETHER;
1280         }
1281
1282         skb_queue_head_init(&sdata->skb_queue);
1283         INIT_WORK(&sdata->work, ieee80211_iface_work);
1284         INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1285         INIT_WORK(&sdata->csa_finalize_work, ieee80211_csa_finalize_work);
1286
1287         switch (type) {
1288         case NL80211_IFTYPE_P2P_GO:
1289                 type = NL80211_IFTYPE_AP;
1290                 sdata->vif.type = type;
1291                 sdata->vif.p2p = true;
1292                 /* fall through */
1293         case NL80211_IFTYPE_AP:
1294                 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1295                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1296                 INIT_WORK(&sdata->u.ap.request_smps_work,
1297                           ieee80211_request_smps_ap_work);
1298                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1299                 sdata->u.ap.req_smps = IEEE80211_SMPS_OFF;
1300                 break;
1301         case NL80211_IFTYPE_P2P_CLIENT:
1302                 type = NL80211_IFTYPE_STATION;
1303                 sdata->vif.type = type;
1304                 sdata->vif.p2p = true;
1305                 /* fall through */
1306         case NL80211_IFTYPE_STATION:
1307                 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1308                 ieee80211_sta_setup_sdata(sdata);
1309                 break;
1310         case NL80211_IFTYPE_ADHOC:
1311                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1312                 ieee80211_ibss_setup_sdata(sdata);
1313                 break;
1314         case NL80211_IFTYPE_MESH_POINT:
1315                 if (ieee80211_vif_is_mesh(&sdata->vif))
1316                         ieee80211_mesh_init_sdata(sdata);
1317                 break;
1318         case NL80211_IFTYPE_MONITOR:
1319                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1320                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1321                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
1322                                       MONITOR_FLAG_OTHER_BSS;
1323                 break;
1324         case NL80211_IFTYPE_WDS:
1325                 sdata->vif.bss_conf.bssid = NULL;
1326                 break;
1327         case NL80211_IFTYPE_AP_VLAN:
1328         case NL80211_IFTYPE_P2P_DEVICE:
1329                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1330                 break;
1331         case NL80211_IFTYPE_UNSPECIFIED:
1332         case NUM_NL80211_IFTYPES:
1333                 BUG();
1334                 break;
1335         }
1336
1337         ieee80211_debugfs_add_netdev(sdata);
1338 }
1339
1340 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1341                                            enum nl80211_iftype type)
1342 {
1343         struct ieee80211_local *local = sdata->local;
1344         int ret, err;
1345         enum nl80211_iftype internal_type = type;
1346         bool p2p = false;
1347
1348         ASSERT_RTNL();
1349
1350         if (!local->ops->change_interface)
1351                 return -EBUSY;
1352
1353         switch (sdata->vif.type) {
1354         case NL80211_IFTYPE_AP:
1355         case NL80211_IFTYPE_STATION:
1356         case NL80211_IFTYPE_ADHOC:
1357                 /*
1358                  * Could maybe also all others here?
1359                  * Just not sure how that interacts
1360                  * with the RX/config path e.g. for
1361                  * mesh.
1362                  */
1363                 break;
1364         default:
1365                 return -EBUSY;
1366         }
1367
1368         switch (type) {
1369         case NL80211_IFTYPE_AP:
1370         case NL80211_IFTYPE_STATION:
1371         case NL80211_IFTYPE_ADHOC:
1372                 /*
1373                  * Could probably support everything
1374                  * but WDS here (WDS do_open can fail
1375                  * under memory pressure, which this
1376                  * code isn't prepared to handle).
1377                  */
1378                 break;
1379         case NL80211_IFTYPE_P2P_CLIENT:
1380                 p2p = true;
1381                 internal_type = NL80211_IFTYPE_STATION;
1382                 break;
1383         case NL80211_IFTYPE_P2P_GO:
1384                 p2p = true;
1385                 internal_type = NL80211_IFTYPE_AP;
1386                 break;
1387         default:
1388                 return -EBUSY;
1389         }
1390
1391         ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1392         if (ret)
1393                 return ret;
1394
1395         ieee80211_do_stop(sdata, false);
1396
1397         ieee80211_teardown_sdata(sdata);
1398
1399         ret = drv_change_interface(local, sdata, internal_type, p2p);
1400         if (ret)
1401                 type = ieee80211_vif_type_p2p(&sdata->vif);
1402
1403         /*
1404          * Ignore return value here, there's not much we can do since
1405          * the driver changed the interface type internally already.
1406          * The warnings will hopefully make driver authors fix it :-)
1407          */
1408         ieee80211_check_queues(sdata, type);
1409
1410         ieee80211_setup_sdata(sdata, type);
1411
1412         err = ieee80211_do_open(&sdata->wdev, false);
1413         WARN(err, "type change: do_open returned %d", err);
1414
1415         return ret;
1416 }
1417
1418 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1419                              enum nl80211_iftype type)
1420 {
1421         int ret;
1422
1423         ASSERT_RTNL();
1424
1425         if (type == ieee80211_vif_type_p2p(&sdata->vif))
1426                 return 0;
1427
1428         if (ieee80211_sdata_running(sdata)) {
1429                 ret = ieee80211_runtime_change_iftype(sdata, type);
1430                 if (ret)
1431                         return ret;
1432         } else {
1433                 /* Purge and reset type-dependent state. */
1434                 ieee80211_teardown_sdata(sdata);
1435                 ieee80211_setup_sdata(sdata, type);
1436         }
1437
1438         /* reset some values that shouldn't be kept across type changes */
1439         sdata->drop_unencrypted = 0;
1440         if (type == NL80211_IFTYPE_STATION)
1441                 sdata->u.mgd.use_4addr = false;
1442
1443         return 0;
1444 }
1445
1446 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1447                                        u8 *perm_addr, enum nl80211_iftype type)
1448 {
1449         struct ieee80211_sub_if_data *sdata;
1450         u64 mask, start, addr, val, inc;
1451         u8 *m;
1452         u8 tmp_addr[ETH_ALEN];
1453         int i;
1454
1455         /* default ... something at least */
1456         memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1457
1458         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1459             local->hw.wiphy->n_addresses <= 1)
1460                 return;
1461
1462         mutex_lock(&local->iflist_mtx);
1463
1464         switch (type) {
1465         case NL80211_IFTYPE_MONITOR:
1466                 /* doesn't matter */
1467                 break;
1468         case NL80211_IFTYPE_WDS:
1469         case NL80211_IFTYPE_AP_VLAN:
1470                 /* match up with an AP interface */
1471                 list_for_each_entry(sdata, &local->interfaces, list) {
1472                         if (sdata->vif.type != NL80211_IFTYPE_AP)
1473                                 continue;
1474                         memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1475                         break;
1476                 }
1477                 /* keep default if no AP interface present */
1478                 break;
1479         case NL80211_IFTYPE_P2P_CLIENT:
1480         case NL80211_IFTYPE_P2P_GO:
1481                 if (local->hw.flags & IEEE80211_HW_P2P_DEV_ADDR_FOR_INTF) {
1482                         list_for_each_entry(sdata, &local->interfaces, list) {
1483                                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1484                                         continue;
1485                                 if (!ieee80211_sdata_running(sdata))
1486                                         continue;
1487                                 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1488                                 goto out_unlock;
1489                         }
1490                 }
1491                 /* otherwise fall through */
1492         default:
1493                 /* assign a new address if possible -- try n_addresses first */
1494                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1495                         bool used = false;
1496
1497                         list_for_each_entry(sdata, &local->interfaces, list) {
1498                                 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr,
1499                                                      sdata->vif.addr)) {
1500                                         used = true;
1501                                         break;
1502                                 }
1503                         }
1504
1505                         if (!used) {
1506                                 memcpy(perm_addr,
1507                                        local->hw.wiphy->addresses[i].addr,
1508                                        ETH_ALEN);
1509                                 break;
1510                         }
1511                 }
1512
1513                 /* try mask if available */
1514                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1515                         break;
1516
1517                 m = local->hw.wiphy->addr_mask;
1518                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1519                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1520                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1521
1522                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1523                         /* not a contiguous mask ... not handled now! */
1524                         pr_info("not contiguous\n");
1525                         break;
1526                 }
1527
1528                 /*
1529                  * Pick address of existing interface in case user changed
1530                  * MAC address manually, default to perm_addr.
1531                  */
1532                 m = local->hw.wiphy->perm_addr;
1533                 list_for_each_entry(sdata, &local->interfaces, list) {
1534                         if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
1535                                 continue;
1536                         m = sdata->vif.addr;
1537                         break;
1538                 }
1539                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1540                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1541                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1542
1543                 inc = 1ULL<<__ffs64(mask);
1544                 val = (start & mask);
1545                 addr = (start & ~mask) | (val & mask);
1546                 do {
1547                         bool used = false;
1548
1549                         tmp_addr[5] = addr >> 0*8;
1550                         tmp_addr[4] = addr >> 1*8;
1551                         tmp_addr[3] = addr >> 2*8;
1552                         tmp_addr[2] = addr >> 3*8;
1553                         tmp_addr[1] = addr >> 4*8;
1554                         tmp_addr[0] = addr >> 5*8;
1555
1556                         val += inc;
1557
1558                         list_for_each_entry(sdata, &local->interfaces, list) {
1559                                 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) {
1560                                         used = true;
1561                                         break;
1562                                 }
1563                         }
1564
1565                         if (!used) {
1566                                 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1567                                 break;
1568                         }
1569                         addr = (start & ~mask) | (val & mask);
1570                 } while (addr != start);
1571
1572                 break;
1573         }
1574
1575  out_unlock:
1576         mutex_unlock(&local->iflist_mtx);
1577 }
1578
1579 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1580                      struct wireless_dev **new_wdev, enum nl80211_iftype type,
1581                      struct vif_params *params)
1582 {
1583         struct net_device *ndev = NULL;
1584         struct ieee80211_sub_if_data *sdata = NULL;
1585         int ret, i;
1586         int txqs = 1;
1587
1588         ASSERT_RTNL();
1589
1590         if (type == NL80211_IFTYPE_P2P_DEVICE) {
1591                 struct wireless_dev *wdev;
1592
1593                 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1594                                 GFP_KERNEL);
1595                 if (!sdata)
1596                         return -ENOMEM;
1597                 wdev = &sdata->wdev;
1598
1599                 sdata->dev = NULL;
1600                 strlcpy(sdata->name, name, IFNAMSIZ);
1601                 ieee80211_assign_perm_addr(local, wdev->address, type);
1602                 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1603         } else {
1604                 if (local->hw.queues >= IEEE80211_NUM_ACS)
1605                         txqs = IEEE80211_NUM_ACS;
1606
1607                 ndev = alloc_netdev_mqs(sizeof(*sdata) +
1608                                         local->hw.vif_data_size,
1609                                         name, ieee80211_if_setup, txqs, 1);
1610                 if (!ndev)
1611                         return -ENOMEM;
1612                 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1613
1614                 ndev->needed_headroom = local->tx_headroom +
1615                                         4*6 /* four MAC addresses */
1616                                         + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1617                                         + 6 /* mesh */
1618                                         + 8 /* rfc1042/bridge tunnel */
1619                                         - ETH_HLEN /* ethernet hard_header_len */
1620                                         + IEEE80211_ENCRYPT_HEADROOM;
1621                 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1622
1623                 ret = dev_alloc_name(ndev, ndev->name);
1624                 if (ret < 0) {
1625                         free_netdev(ndev);
1626                         return ret;
1627                 }
1628
1629                 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1630                 memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1631                 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1632
1633                 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1634                 sdata = netdev_priv(ndev);
1635                 ndev->ieee80211_ptr = &sdata->wdev;
1636                 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1637                 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1638
1639                 sdata->dev = ndev;
1640         }
1641
1642         /* initialise type-independent data */
1643         sdata->wdev.wiphy = local->hw.wiphy;
1644         sdata->local = local;
1645
1646         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1647                 skb_queue_head_init(&sdata->fragments[i].skb_list);
1648
1649         INIT_LIST_HEAD(&sdata->key_list);
1650
1651         INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
1652                           ieee80211_dfs_cac_timer_work);
1653         INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
1654                           ieee80211_delayed_tailroom_dec);
1655
1656         for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1657                 struct ieee80211_supported_band *sband;
1658                 sband = local->hw.wiphy->bands[i];
1659                 sdata->rc_rateidx_mask[i] =
1660                         sband ? (1 << sband->n_bitrates) - 1 : 0;
1661                 if (sband)
1662                         memcpy(sdata->rc_rateidx_mcs_mask[i],
1663                                sband->ht_cap.mcs.rx_mask,
1664                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1665                 else
1666                         memset(sdata->rc_rateidx_mcs_mask[i], 0,
1667                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1668         }
1669
1670         ieee80211_set_default_queues(sdata);
1671
1672         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1673         sdata->user_power_level = local->user_power_level;
1674
1675         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1676
1677         /* setup type-dependent data */
1678         ieee80211_setup_sdata(sdata, type);
1679
1680         if (ndev) {
1681                 if (params) {
1682                         ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1683                         if (type == NL80211_IFTYPE_STATION)
1684                                 sdata->u.mgd.use_4addr = params->use_4addr;
1685                 }
1686
1687                 ndev->features |= local->hw.netdev_features;
1688
1689                 ret = register_netdevice(ndev);
1690                 if (ret) {
1691                         free_netdev(ndev);
1692                         return ret;
1693                 }
1694         }
1695
1696         mutex_lock(&local->iflist_mtx);
1697         list_add_tail_rcu(&sdata->list, &local->interfaces);
1698         mutex_unlock(&local->iflist_mtx);
1699
1700         if (new_wdev)
1701                 *new_wdev = &sdata->wdev;
1702
1703         return 0;
1704 }
1705
1706 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1707 {
1708         ASSERT_RTNL();
1709
1710         mutex_lock(&sdata->local->iflist_mtx);
1711         list_del_rcu(&sdata->list);
1712         mutex_unlock(&sdata->local->iflist_mtx);
1713
1714         synchronize_rcu();
1715
1716         if (sdata->dev) {
1717                 unregister_netdevice(sdata->dev);
1718         } else {
1719                 cfg80211_unregister_wdev(&sdata->wdev);
1720                 kfree(sdata);
1721         }
1722 }
1723
1724 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
1725 {
1726         if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
1727                 return;
1728         ieee80211_do_stop(sdata, true);
1729         ieee80211_teardown_sdata(sdata);
1730 }
1731
1732 /*
1733  * Remove all interfaces, may only be called at hardware unregistration
1734  * time because it doesn't do RCU-safe list removals.
1735  */
1736 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1737 {
1738         struct ieee80211_sub_if_data *sdata, *tmp;
1739         LIST_HEAD(unreg_list);
1740         LIST_HEAD(wdev_list);
1741
1742         ASSERT_RTNL();
1743
1744         /*
1745          * Close all AP_VLAN interfaces first, as otherwise they
1746          * might be closed while the AP interface they belong to
1747          * is closed, causing unregister_netdevice_many() to crash.
1748          */
1749         list_for_each_entry(sdata, &local->interfaces, list)
1750                 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1751                         dev_close(sdata->dev);
1752
1753         mutex_lock(&local->iflist_mtx);
1754         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1755                 list_del(&sdata->list);
1756
1757                 if (sdata->dev)
1758                         unregister_netdevice_queue(sdata->dev, &unreg_list);
1759                 else
1760                         list_add(&sdata->list, &wdev_list);
1761         }
1762         mutex_unlock(&local->iflist_mtx);
1763         unregister_netdevice_many(&unreg_list);
1764         list_del(&unreg_list);
1765
1766         list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
1767                 list_del(&sdata->list);
1768                 cfg80211_unregister_wdev(&sdata->wdev);
1769                 kfree(sdata);
1770         }
1771 }
1772
1773 static int netdev_notify(struct notifier_block *nb,
1774                          unsigned long state, void *ptr)
1775 {
1776         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1777         struct ieee80211_sub_if_data *sdata;
1778
1779         if (state != NETDEV_CHANGENAME)
1780                 return 0;
1781
1782         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1783                 return 0;
1784
1785         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1786                 return 0;
1787
1788         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1789
1790         memcpy(sdata->name, dev->name, IFNAMSIZ);
1791
1792         ieee80211_debugfs_rename_netdev(sdata);
1793         return 0;
1794 }
1795
1796 static struct notifier_block mac80211_netdev_notifier = {
1797         .notifier_call = netdev_notify,
1798 };
1799
1800 int ieee80211_iface_init(void)
1801 {
1802         return register_netdevice_notifier(&mac80211_netdev_notifier);
1803 }
1804
1805 void ieee80211_iface_exit(void)
1806 {
1807         unregister_netdevice_notifier(&mac80211_netdev_notifier);
1808 }