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