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         bool cancel_scan;
 764
 765         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 766
 767         cancel_scan = rcu_access_pointer(local->scan_sdata) == sdata;
 768         if (cancel_scan)
 769                 ieee80211_scan_cancel(local);
 770
 771         /*
 772          * Stop TX on this interface first.
 773          */
 774         if (sdata->dev)
 775                 netif_tx_stop_all_queues(sdata->dev);
 776
 777         ieee80211_roc_purge(local, sdata);
 778
 779         switch (sdata->vif.type) {
 780         case NL80211_IFTYPE_STATION:
 781                 ieee80211_mgd_stop(sdata);
 782                 break;
 783         case NL80211_IFTYPE_ADHOC:
 784                 ieee80211_ibss_stop(sdata);
 785                 break;
 786         case NL80211_IFTYPE_AP:
 787                 cancel_work_sync(&sdata->u.ap.request_smps_work);
 788                 break;
 789         default:
 790                 break;
 791         }
 792
 793         /*
 794          * Remove all stations associated with this interface.
 795          *
 796          * This must be done before calling ops->remove_interface()
 797          * because otherwise we can later invoke ops->sta_notify()
 798          * whenever the STAs are removed, and that invalidates driver
 799          * assumptions about always getting a vif pointer that is valid
 800          * (because if we remove a STA after ops->remove_interface()
 801          * the driver will have removed the vif info already!)
 802          *
 803          * This is relevant only in WDS mode, in all other modes we've
 804          * already removed all stations when disconnecting or similar,
 805          * so warn otherwise.
 806          */
 807         flushed = sta_info_flush(sdata);
 808         WARN_ON_ONCE((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) ||
 809                      (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1));
 810
 811         /* don't count this interface for promisc/allmulti while it is down */
 812         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 813                 atomic_dec(&local->iff_allmultis);
 814
 815         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 816                 atomic_dec(&local->iff_promiscs);
 817
 818         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 819                 local->fif_pspoll--;
 820                 local->fif_probe_req--;
 821         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 822                 local->fif_probe_req--;
 823         }
 824
 825         if (sdata->dev) {
 826                 netif_addr_lock_bh(sdata->dev);
 827                 spin_lock_bh(&local->filter_lock);
 828                 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
 829                                  sdata->dev->addr_len);
 830                 spin_unlock_bh(&local->filter_lock);
 831                 netif_addr_unlock_bh(sdata->dev);
 832         }
 833
 834         del_timer_sync(&local->dynamic_ps_timer);
 835         cancel_work_sync(&local->dynamic_ps_enable_work);
 836
 837         cancel_work_sync(&sdata->recalc_smps);
 838         sdata->vif.csa_active = false;
 839         cancel_work_sync(&sdata->csa_finalize_work);
 840
 841         cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
 842
 843         if (sdata->wdev.cac_started) {
 844                 chandef = sdata->vif.bss_conf.chandef;
 845                 WARN_ON(local->suspended);
 846                 mutex_lock(&local->mtx);
 847                 ieee80211_vif_release_channel(sdata);
 848                 mutex_unlock(&local->mtx);
 849                 cfg80211_cac_event(sdata->dev, &chandef,
 850                                    NL80211_RADAR_CAC_ABORTED,
 851                                    GFP_KERNEL);
 852         }
 853
 854         /* APs need special treatment */
 855         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 856                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
 857
 858                 /* down all dependent devices, that is VLANs */
 859                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
 860                                          u.vlan.list)
 861                         dev_close(vlan->dev);
 862                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
 863         } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 864                 /* remove all packets in parent bc_buf pointing to this dev */
 865                 ps = &sdata->bss->ps;
 866
 867                 spin_lock_irqsave(&ps->bc_buf.lock, flags);
 868                 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
 869                         if (skb->dev == sdata->dev) {
 870                                 __skb_unlink(skb, &ps->bc_buf);
 871                                 local->total_ps_buffered--;
 872                                 ieee80211_free_txskb(&local->hw, skb);
 873                         }
 874                 }
 875                 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
 876         }
 877
 878         if (going_down)
 879                 local->open_count--;
 880
 881         switch (sdata->vif.type) {
 882         case NL80211_IFTYPE_AP_VLAN:
 883                 list_del(&sdata->u.vlan.list);
 884                 rcu_assign_pointer(sdata->vif.chanctx_conf, NULL);
 885                 /* no need to tell driver */
 886                 break;
 887         case NL80211_IFTYPE_MONITOR:
 888                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 889                         local->cooked_mntrs--;
 890                         break;
 891                 }
 892
 893                 local->monitors--;
 894                 if (local->monitors == 0) {
 895                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
 896                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 897                 }
 898
 899                 ieee80211_adjust_monitor_flags(sdata, -1);
 900                 break;
 901         case NL80211_IFTYPE_P2P_DEVICE:
 902                 /* relies on synchronize_rcu() below */
 903                 rcu_assign_pointer(local->p2p_sdata, NULL);
 904                 /* fall through */
 905         default:
 906                 cancel_work_sync(&sdata->work);
 907                 /*
 908                  * When we get here, the interface is marked down.
 909                  * Free the remaining keys, if there are any
 910                  * (shouldn't be, except maybe in WDS mode?)
 911                  *
 912                  * Force the key freeing to always synchronize_net()
 913                  * to wait for the RX path in case it is using this
 914                  * interface enqueuing frames * at this very time on
 915                  * another CPU.
 916                  */
 917                 ieee80211_free_keys(sdata, true);
 918
 919                 /* fall through */
 920         case NL80211_IFTYPE_AP:
 921                 skb_queue_purge(&sdata->skb_queue);
 922         }
 923
 924         sdata->bss = NULL;
 925
 926         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 927         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 928                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
 929                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 930                         if (info->control.vif == &sdata->vif) {
 931                                 __skb_unlink(skb, &local->pending[i]);
 932                                 ieee80211_free_txskb(&local->hw, skb);
 933                         }
 934                 }
 935         }
 936         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 937
 938         if (local->open_count == 0)
 939                 ieee80211_clear_tx_pending(local);
 940
 941         /*
 942          * If the interface goes down while suspended, presumably because
 943          * the device was unplugged and that happens before our resume,
 944          * then the driver is already unconfigured and the remainder of
 945          * this function isn't needed.
 946          * XXX: what about WoWLAN? If the device has software state, e.g.
 947          *      memory allocated, it might expect teardown commands from
 948          *      mac80211 here?
 949          */
 950         if (local->suspended) {
 951                 WARN_ON(local->wowlan);
 952                 WARN_ON(rtnl_dereference(local->monitor_sdata));
 953                 return;
 954         }
 955
 956         switch (sdata->vif.type) {
 957         case NL80211_IFTYPE_AP_VLAN:
 958                 break;
 959         case NL80211_IFTYPE_MONITOR:
 960                 if (local->monitors == 0)
 961                         ieee80211_del_virtual_monitor(local);
 962
 963                 mutex_lock(&local->mtx);
 964                 ieee80211_recalc_idle(local);
 965                 mutex_unlock(&local->mtx);
 966
 967                 if (!(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE))
 968                         break;
 969
 970                 /* fall through */
 971         default:
 972                 if (going_down)
 973                         drv_remove_interface(local, sdata);
 974         }
 975
 976         ieee80211_recalc_ps(local, -1);
 977
 978         if (cancel_scan)
 979                 flush_delayed_work(&local->scan_work);
 980
 981         if (local->open_count == 0) {
 982                 ieee80211_stop_device(local);
 983
 984                 /* no reconfiguring after stop! */
 985                 return;
 986         }
 987
 988         /* do after stop to avoid reconfiguring when we stop anyway */
 989         ieee80211_configure_filter(local);
 990         ieee80211_hw_config(local, hw_reconf_flags);
 991
 992         if (local->monitors == local->open_count)
 993                 ieee80211_add_virtual_monitor(local);
 994 }
 995
 996 static int ieee80211_stop(struct net_device *dev)
 997 {
 998         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 999
1000         ieee80211_do_stop(sdata, true);
1001
1002         return 0;
1003 }
1004
1005 static void ieee80211_set_multicast_list(struct net_device *dev)
1006 {
1007         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1008         struct ieee80211_local *local = sdata->local;
1009         int allmulti, promisc, sdata_allmulti, sdata_promisc;
1010
1011         allmulti = !!(dev->flags & IFF_ALLMULTI);
1012         promisc = !!(dev->flags & IFF_PROMISC);
1013         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
1014         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
1015
1016         if (allmulti != sdata_allmulti) {
1017                 if (dev->flags & IFF_ALLMULTI)
1018                         atomic_inc(&local->iff_allmultis);
1019                 else
1020                         atomic_dec(&local->iff_allmultis);
1021                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
1022         }
1023
1024         if (promisc != sdata_promisc) {
1025                 if (dev->flags & IFF_PROMISC)
1026                         atomic_inc(&local->iff_promiscs);
1027                 else
1028                         atomic_dec(&local->iff_promiscs);
1029                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
1030         }
1031         spin_lock_bh(&local->filter_lock);
1032         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
1033         spin_unlock_bh(&local->filter_lock);
1034         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
1035 }
1036
1037 /*
1038  * Called when the netdev is removed or, by the code below, before
1039  * the interface type changes.
1040  */
1041 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
1042 {
1043         int i;
1044
1045         /* free extra data */
1046         ieee80211_free_keys(sdata, false);
1047
1048         ieee80211_debugfs_remove_netdev(sdata);
1049
1050         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1051                 __skb_queue_purge(&sdata->fragments[i].skb_list);
1052         sdata->fragment_next = 0;
1053
1054         if (ieee80211_vif_is_mesh(&sdata->vif))
1055                 mesh_rmc_free(sdata);
1056 }
1057
1058 static void ieee80211_uninit(struct net_device *dev)
1059 {
1060         ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
1061 }
1062
1063 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
1064                                          struct sk_buff *skb,
1065                                          void *accel_priv,
1066                                          select_queue_fallback_t fallback)
1067 {
1068         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
1069 }
1070
1071 static const struct net_device_ops ieee80211_dataif_ops = {
1072         .ndo_open               = ieee80211_open,
1073         .ndo_stop               = ieee80211_stop,
1074         .ndo_uninit             = ieee80211_uninit,
1075         .ndo_start_xmit         = ieee80211_subif_start_xmit,
1076         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1077         .ndo_change_mtu         = ieee80211_change_mtu,
1078         .ndo_set_mac_address    = ieee80211_change_mac,
1079         .ndo_select_queue       = ieee80211_netdev_select_queue,
1080 };
1081
1082 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
1083                                           struct sk_buff *skb,
1084                                           void *accel_priv,
1085                                           select_queue_fallback_t fallback)
1086 {
1087         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1088         struct ieee80211_local *local = sdata->local;
1089         struct ieee80211_hdr *hdr;
1090         struct ieee80211_radiotap_header *rtap = (void *)skb->data;
1091
1092         if (local->hw.queues < IEEE80211_NUM_ACS)
1093                 return 0;
1094
1095         if (skb->len < 4 ||
1096             skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
1097                 return 0; /* doesn't matter, frame will be dropped */
1098
1099         hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
1100
1101         return ieee80211_select_queue_80211(sdata, skb, hdr);
1102 }
1103
1104 static const struct net_device_ops ieee80211_monitorif_ops = {
1105         .ndo_open               = ieee80211_open,
1106         .ndo_stop               = ieee80211_stop,
1107         .ndo_uninit             = ieee80211_uninit,
1108         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
1109         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1110         .ndo_change_mtu         = ieee80211_change_mtu,
1111         .ndo_set_mac_address    = ieee80211_change_mac,
1112         .ndo_select_queue       = ieee80211_monitor_select_queue,
1113 };
1114
1115 static void ieee80211_if_setup(struct net_device *dev)
1116 {
1117         ether_setup(dev);
1118         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1119         dev->netdev_ops = &ieee80211_dataif_ops;
1120         dev->destructor = free_netdev;
1121 }
1122
1123 static void ieee80211_iface_work(struct work_struct *work)
1124 {
1125         struct ieee80211_sub_if_data *sdata =
1126                 container_of(work, struct ieee80211_sub_if_data, work);
1127         struct ieee80211_local *local = sdata->local;
1128         struct sk_buff *skb;
1129         struct sta_info *sta;
1130         struct ieee80211_ra_tid *ra_tid;
1131
1132         if (!ieee80211_sdata_running(sdata))
1133                 return;
1134
1135         if (local->scanning)
1136                 return;
1137
1138         /*
1139          * ieee80211_queue_work() should have picked up most cases,
1140          * here we'll pick the rest.
1141          */
1142         if (WARN(local->suspended,
1143                  "interface work scheduled while going to suspend\n"))
1144                 return;
1145
1146         /* first process frames */
1147         while ((skb = skb_dequeue(&sdata->skb_queue))) {
1148                 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1149
1150                 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
1151                         ra_tid = (void *)&skb->cb;
1152                         ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
1153                                                  ra_tid->tid);
1154                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
1155                         ra_tid = (void *)&skb->cb;
1156                         ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
1157                                                 ra_tid->tid);
1158                 } else if (ieee80211_is_action(mgmt->frame_control) &&
1159                            mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1160                         int len = skb->len;
1161
1162                         mutex_lock(&local->sta_mtx);
1163                         sta = sta_info_get_bss(sdata, mgmt->sa);
1164                         if (sta) {
1165                                 switch (mgmt->u.action.u.addba_req.action_code) {
1166                                 case WLAN_ACTION_ADDBA_REQ:
1167                                         ieee80211_process_addba_request(
1168                                                         local, sta, mgmt, len);
1169                                         break;
1170                                 case WLAN_ACTION_ADDBA_RESP:
1171                                         ieee80211_process_addba_resp(local, sta,
1172                                                                      mgmt, len);
1173                                         break;
1174                                 case WLAN_ACTION_DELBA:
1175                                         ieee80211_process_delba(sdata, sta,
1176                                                                 mgmt, len);
1177                                         break;
1178                                 default:
1179                                         WARN_ON(1);
1180                                         break;
1181                                 }
1182                         }
1183                         mutex_unlock(&local->sta_mtx);
1184                 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1185                         struct ieee80211_hdr *hdr = (void *)mgmt;
1186                         /*
1187                          * So the frame isn't mgmt, but frame_control
1188                          * is at the right place anyway, of course, so
1189                          * the if statement is correct.
1190                          *
1191                          * Warn if we have other data frame types here,
1192                          * they must not get here.
1193                          */
1194                         WARN_ON(hdr->frame_control &
1195                                         cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1196                         WARN_ON(!(hdr->seq_ctrl &
1197                                         cpu_to_le16(IEEE80211_SCTL_FRAG)));
1198                         /*
1199                          * This was a fragment of a frame, received while
1200                          * a block-ack session was active. That cannot be
1201                          * right, so terminate the session.
1202                          */
1203                         mutex_lock(&local->sta_mtx);
1204                         sta = sta_info_get_bss(sdata, mgmt->sa);
1205                         if (sta) {
1206                                 u16 tid = *ieee80211_get_qos_ctl(hdr) &
1207                                                 IEEE80211_QOS_CTL_TID_MASK;
1208
1209                                 __ieee80211_stop_rx_ba_session(
1210                                         sta, tid, WLAN_BACK_RECIPIENT,
1211                                         WLAN_REASON_QSTA_REQUIRE_SETUP,
1212                                         true);
1213                         }
1214                         mutex_unlock(&local->sta_mtx);
1215                 } else switch (sdata->vif.type) {
1216                 case NL80211_IFTYPE_STATION:
1217                         ieee80211_sta_rx_queued_mgmt(sdata, skb);
1218                         break;
1219                 case NL80211_IFTYPE_ADHOC:
1220                         ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1221                         break;
1222                 case NL80211_IFTYPE_MESH_POINT:
1223                         if (!ieee80211_vif_is_mesh(&sdata->vif))
1224                                 break;
1225                         ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1226                         break;
1227                 default:
1228                         WARN(1, "frame for unexpected interface type");
1229                         break;
1230                 }
1231
1232                 kfree_skb(skb);
1233         }
1234
1235         /* then other type-dependent work */
1236         switch (sdata->vif.type) {
1237         case NL80211_IFTYPE_STATION:
1238                 ieee80211_sta_work(sdata);
1239                 break;
1240         case NL80211_IFTYPE_ADHOC:
1241                 ieee80211_ibss_work(sdata);
1242                 break;
1243         case NL80211_IFTYPE_MESH_POINT:
1244                 if (!ieee80211_vif_is_mesh(&sdata->vif))
1245                         break;
1246                 ieee80211_mesh_work(sdata);
1247                 break;
1248         default:
1249                 break;
1250         }
1251 }
1252
1253 static void ieee80211_recalc_smps_work(struct work_struct *work)
1254 {
1255         struct ieee80211_sub_if_data *sdata =
1256                 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1257
1258         ieee80211_recalc_smps(sdata);
1259 }
1260
1261 /*
1262  * Helper function to initialise an interface to a specific type.
1263  */
1264 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1265                                   enum nl80211_iftype type)
1266 {
1267         /* clear type-dependent union */
1268         memset(&sdata->u, 0, sizeof(sdata->u));
1269
1270         /* and set some type-dependent values */
1271         sdata->vif.type = type;
1272         sdata->vif.p2p = false;
1273         sdata->wdev.iftype = type;
1274
1275         sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1276         sdata->control_port_no_encrypt = false;
1277         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1278
1279         sdata->noack_map = 0;
1280
1281         /* only monitor/p2p-device differ */
1282         if (sdata->dev) {
1283                 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1284                 sdata->dev->type = ARPHRD_ETHER;
1285         }
1286
1287         skb_queue_head_init(&sdata->skb_queue);
1288         INIT_WORK(&sdata->work, ieee80211_iface_work);
1289         INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1290         INIT_WORK(&sdata->csa_finalize_work, ieee80211_csa_finalize_work);
1291
1292         switch (type) {
1293         case NL80211_IFTYPE_P2P_GO:
1294                 type = NL80211_IFTYPE_AP;
1295                 sdata->vif.type = type;
1296                 sdata->vif.p2p = true;
1297                 /* fall through */
1298         case NL80211_IFTYPE_AP:
1299                 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1300                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1301                 INIT_WORK(&sdata->u.ap.request_smps_work,
1302                           ieee80211_request_smps_ap_work);
1303                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1304                 sdata->u.ap.req_smps = IEEE80211_SMPS_OFF;
1305                 break;
1306         case NL80211_IFTYPE_P2P_CLIENT:
1307                 type = NL80211_IFTYPE_STATION;
1308                 sdata->vif.type = type;
1309                 sdata->vif.p2p = true;
1310                 /* fall through */
1311         case NL80211_IFTYPE_STATION:
1312                 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1313                 ieee80211_sta_setup_sdata(sdata);
1314                 break;
1315         case NL80211_IFTYPE_ADHOC:
1316                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1317                 ieee80211_ibss_setup_sdata(sdata);
1318                 break;
1319         case NL80211_IFTYPE_MESH_POINT:
1320                 if (ieee80211_vif_is_mesh(&sdata->vif))
1321                         ieee80211_mesh_init_sdata(sdata);
1322                 break;
1323         case NL80211_IFTYPE_MONITOR:
1324                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1325                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1326                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
1327                                       MONITOR_FLAG_OTHER_BSS;
1328                 break;
1329         case NL80211_IFTYPE_WDS:
1330                 sdata->vif.bss_conf.bssid = NULL;
1331                 break;
1332         case NL80211_IFTYPE_AP_VLAN:
1333         case NL80211_IFTYPE_P2P_DEVICE:
1334                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1335                 break;
1336         case NL80211_IFTYPE_UNSPECIFIED:
1337         case NUM_NL80211_IFTYPES:
1338                 BUG();
1339                 break;
1340         }
1341
1342         ieee80211_debugfs_add_netdev(sdata);
1343 }
1344
1345 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1346                                            enum nl80211_iftype type)
1347 {
1348         struct ieee80211_local *local = sdata->local;
1349         int ret, err;
1350         enum nl80211_iftype internal_type = type;
1351         bool p2p = false;
1352
1353         ASSERT_RTNL();
1354
1355         if (!local->ops->change_interface)
1356                 return -EBUSY;
1357
1358         switch (sdata->vif.type) {
1359         case NL80211_IFTYPE_AP:
1360         case NL80211_IFTYPE_STATION:
1361         case NL80211_IFTYPE_ADHOC:
1362                 /*
1363                  * Could maybe also all others here?
1364                  * Just not sure how that interacts
1365                  * with the RX/config path e.g. for
1366                  * mesh.
1367                  */
1368                 break;
1369         default:
1370                 return -EBUSY;
1371         }
1372
1373         switch (type) {
1374         case NL80211_IFTYPE_AP:
1375         case NL80211_IFTYPE_STATION:
1376         case NL80211_IFTYPE_ADHOC:
1377                 /*
1378                  * Could probably support everything
1379                  * but WDS here (WDS do_open can fail
1380                  * under memory pressure, which this
1381                  * code isn't prepared to handle).
1382                  */
1383                 break;
1384         case NL80211_IFTYPE_P2P_CLIENT:
1385                 p2p = true;
1386                 internal_type = NL80211_IFTYPE_STATION;
1387                 break;
1388         case NL80211_IFTYPE_P2P_GO:
1389                 p2p = true;
1390                 internal_type = NL80211_IFTYPE_AP;
1391                 break;
1392         default:
1393                 return -EBUSY;
1394         }
1395
1396         ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1397         if (ret)
1398                 return ret;
1399
1400         ieee80211_do_stop(sdata, false);
1401
1402         ieee80211_teardown_sdata(sdata);
1403
1404         ret = drv_change_interface(local, sdata, internal_type, p2p);
1405         if (ret)
1406                 type = ieee80211_vif_type_p2p(&sdata->vif);
1407
1408         /*
1409          * Ignore return value here, there's not much we can do since
1410          * the driver changed the interface type internally already.
1411          * The warnings will hopefully make driver authors fix it :-)
1412          */
1413         ieee80211_check_queues(sdata, type);
1414
1415         ieee80211_setup_sdata(sdata, type);
1416
1417         err = ieee80211_do_open(&sdata->wdev, false);
1418         WARN(err, "type change: do_open returned %d", err);
1419
1420         return ret;
1421 }
1422
1423 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1424                              enum nl80211_iftype type)
1425 {
1426         int ret;
1427
1428         ASSERT_RTNL();
1429
1430         if (type == ieee80211_vif_type_p2p(&sdata->vif))
1431                 return 0;
1432
1433         if (ieee80211_sdata_running(sdata)) {
1434                 ret = ieee80211_runtime_change_iftype(sdata, type);
1435                 if (ret)
1436                         return ret;
1437         } else {
1438                 /* Purge and reset type-dependent state. */
1439                 ieee80211_teardown_sdata(sdata);
1440                 ieee80211_setup_sdata(sdata, type);
1441         }
1442
1443         /* reset some values that shouldn't be kept across type changes */
1444         sdata->drop_unencrypted = 0;
1445         if (type == NL80211_IFTYPE_STATION)
1446                 sdata->u.mgd.use_4addr = false;
1447
1448         return 0;
1449 }
1450
1451 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1452                                        u8 *perm_addr, enum nl80211_iftype type)
1453 {
1454         struct ieee80211_sub_if_data *sdata;
1455         u64 mask, start, addr, val, inc;
1456         u8 *m;
1457         u8 tmp_addr[ETH_ALEN];
1458         int i;
1459
1460         /* default ... something at least */
1461         memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1462
1463         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1464             local->hw.wiphy->n_addresses <= 1)
1465                 return;
1466
1467         mutex_lock(&local->iflist_mtx);
1468
1469         switch (type) {
1470         case NL80211_IFTYPE_MONITOR:
1471                 /* doesn't matter */
1472                 break;
1473         case NL80211_IFTYPE_WDS:
1474         case NL80211_IFTYPE_AP_VLAN:
1475                 /* match up with an AP interface */
1476                 list_for_each_entry(sdata, &local->interfaces, list) {
1477                         if (sdata->vif.type != NL80211_IFTYPE_AP)
1478                                 continue;
1479                         memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1480                         break;
1481                 }
1482                 /* keep default if no AP interface present */
1483                 break;
1484         case NL80211_IFTYPE_P2P_CLIENT:
1485         case NL80211_IFTYPE_P2P_GO:
1486                 if (local->hw.flags & IEEE80211_HW_P2P_DEV_ADDR_FOR_INTF) {
1487                         list_for_each_entry(sdata, &local->interfaces, list) {
1488                                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1489                                         continue;
1490                                 if (!ieee80211_sdata_running(sdata))
1491                                         continue;
1492                                 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1493                                 goto out_unlock;
1494                         }
1495                 }
1496                 /* otherwise fall through */
1497         default:
1498                 /* assign a new address if possible -- try n_addresses first */
1499                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1500                         bool used = false;
1501
1502                         list_for_each_entry(sdata, &local->interfaces, list) {
1503                                 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr,
1504                                                      sdata->vif.addr)) {
1505                                         used = true;
1506                                         break;
1507                                 }
1508                         }
1509
1510                         if (!used) {
1511                                 memcpy(perm_addr,
1512                                        local->hw.wiphy->addresses[i].addr,
1513                                        ETH_ALEN);
1514                                 break;
1515                         }
1516                 }
1517
1518                 /* try mask if available */
1519                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1520                         break;
1521
1522                 m = local->hw.wiphy->addr_mask;
1523                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1524                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1525                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1526
1527                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1528                         /* not a contiguous mask ... not handled now! */
1529                         pr_info("not contiguous\n");
1530                         break;
1531                 }
1532
1533                 /*
1534                  * Pick address of existing interface in case user changed
1535                  * MAC address manually, default to perm_addr.
1536                  */
1537                 m = local->hw.wiphy->perm_addr;
1538                 list_for_each_entry(sdata, &local->interfaces, list) {
1539                         if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
1540                                 continue;
1541                         m = sdata->vif.addr;
1542                         break;
1543                 }
1544                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1545                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1546                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1547
1548                 inc = 1ULL<<__ffs64(mask);
1549                 val = (start & mask);
1550                 addr = (start & ~mask) | (val & mask);
1551                 do {
1552                         bool used = false;
1553
1554                         tmp_addr[5] = addr >> 0*8;
1555                         tmp_addr[4] = addr >> 1*8;
1556                         tmp_addr[3] = addr >> 2*8;
1557                         tmp_addr[2] = addr >> 3*8;
1558                         tmp_addr[1] = addr >> 4*8;
1559                         tmp_addr[0] = addr >> 5*8;
1560
1561                         val += inc;
1562
1563                         list_for_each_entry(sdata, &local->interfaces, list) {
1564                                 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) {
1565                                         used = true;
1566                                         break;
1567                                 }
1568                         }
1569
1570                         if (!used) {
1571                                 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1572                                 break;
1573                         }
1574                         addr = (start & ~mask) | (val & mask);
1575                 } while (addr != start);
1576
1577                 break;
1578         }
1579
1580  out_unlock:
1581         mutex_unlock(&local->iflist_mtx);
1582 }
1583
1584 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1585                      struct wireless_dev **new_wdev, enum nl80211_iftype type,
1586                      struct vif_params *params)
1587 {
1588         struct net_device *ndev = NULL;
1589         struct ieee80211_sub_if_data *sdata = NULL;
1590         int ret, i;
1591         int txqs = 1;
1592
1593         ASSERT_RTNL();
1594
1595         if (type == NL80211_IFTYPE_P2P_DEVICE) {
1596                 struct wireless_dev *wdev;
1597
1598                 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1599                                 GFP_KERNEL);
1600                 if (!sdata)
1601                         return -ENOMEM;
1602                 wdev = &sdata->wdev;
1603
1604                 sdata->dev = NULL;
1605                 strlcpy(sdata->name, name, IFNAMSIZ);
1606                 ieee80211_assign_perm_addr(local, wdev->address, type);
1607                 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1608         } else {
1609                 if (local->hw.queues >= IEEE80211_NUM_ACS)
1610                         txqs = IEEE80211_NUM_ACS;
1611
1612                 ndev = alloc_netdev_mqs(sizeof(*sdata) +
1613                                         local->hw.vif_data_size,
1614                                         name, ieee80211_if_setup, txqs, 1);
1615                 if (!ndev)
1616                         return -ENOMEM;
1617                 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1618
1619                 ndev->needed_headroom = local->tx_headroom +
1620                                         4*6 /* four MAC addresses */
1621                                         + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1622                                         + 6 /* mesh */
1623                                         + 8 /* rfc1042/bridge tunnel */
1624                                         - ETH_HLEN /* ethernet hard_header_len */
1625                                         + IEEE80211_ENCRYPT_HEADROOM;
1626                 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1627
1628                 ret = dev_alloc_name(ndev, ndev->name);
1629                 if (ret < 0) {
1630                         free_netdev(ndev);
1631                         return ret;
1632                 }
1633
1634                 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1635                 memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1636                 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1637
1638                 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1639                 sdata = netdev_priv(ndev);
1640                 ndev->ieee80211_ptr = &sdata->wdev;
1641                 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1642                 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1643
1644                 sdata->dev = ndev;
1645         }
1646
1647         /* initialise type-independent data */
1648         sdata->wdev.wiphy = local->hw.wiphy;
1649         sdata->local = local;
1650
1651         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1652                 skb_queue_head_init(&sdata->fragments[i].skb_list);
1653
1654         INIT_LIST_HEAD(&sdata->key_list);
1655
1656         INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
1657                           ieee80211_dfs_cac_timer_work);
1658         INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
1659                           ieee80211_delayed_tailroom_dec);
1660
1661         for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1662                 struct ieee80211_supported_band *sband;
1663                 sband = local->hw.wiphy->bands[i];
1664                 sdata->rc_rateidx_mask[i] =
1665                         sband ? (1 << sband->n_bitrates) - 1 : 0;
1666                 if (sband)
1667                         memcpy(sdata->rc_rateidx_mcs_mask[i],
1668                                sband->ht_cap.mcs.rx_mask,
1669                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1670                 else
1671                         memset(sdata->rc_rateidx_mcs_mask[i], 0,
1672                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1673         }
1674
1675         ieee80211_set_default_queues(sdata);
1676
1677         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1678         sdata->user_power_level = local->user_power_level;
1679
1680         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
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
1770         list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
1771                 list_del(&sdata->list);
1772                 cfg80211_unregister_wdev(&sdata->wdev);
1773                 kfree(sdata);
1774         }
1775 }
1776
1777 static int netdev_notify(struct notifier_block *nb,
1778                          unsigned long state, void *ptr)
1779 {
1780         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1781         struct ieee80211_sub_if_data *sdata;
1782
1783         if (state != NETDEV_CHANGENAME)
1784                 return 0;
1785
1786         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1787                 return 0;
1788
1789         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1790                 return 0;
1791
1792         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1793
1794         memcpy(sdata->name, dev->name, IFNAMSIZ);
1795
1796         ieee80211_debugfs_rename_netdev(sdata);
1797         return 0;
1798 }
1799
1800 static struct notifier_block mac80211_netdev_notifier = {
1801         .notifier_call = netdev_notify,
1802 };
1803
1804 int ieee80211_iface_init(void)
1805 {
1806         return register_netdevice_notifier(&mac80211_netdev_notifier);
1807 }
1808
1809 void ieee80211_iface_exit(void)
1810 {
1811         unregister_netdevice_notifier(&mac80211_netdev_notifier);
1812 }