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 = chanctx_conf->def.chan->max_power;
  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 {
 164         struct ieee80211_local *local = sdata->local;
 165         struct ieee80211_sub_if_data *iter;
 166         u64 new, mask, tmp;
 167         u8 *m;
 168         int ret = 0;
 169
 170         if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
 171                 return 0;
 172
 173         m = addr;
 174         new =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 175                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 176                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 177
 178         m = local->hw.wiphy->addr_mask;
 179         mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 180                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 181                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 182
 183
 184         mutex_lock(&local->iflist_mtx);
 185         list_for_each_entry(iter, &local->interfaces, list) {
 186                 if (iter == sdata)
 187                         continue;
 188
 189                 if (iter->vif.type == NL80211_IFTYPE_MONITOR)
 190                         continue;
 191
 192                 m = iter->vif.addr;
 193                 tmp =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 194                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 195                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 196
 197                 if ((new & ~mask) != (tmp & ~mask)) {
 198                         ret = -EINVAL;
 199                         break;
 200                 }
 201         }
 202         mutex_unlock(&local->iflist_mtx);
 203
 204         return ret;
 205 }
 206
 207 static int ieee80211_change_mac(struct net_device *dev, void *addr)
 208 {
 209         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 210         struct sockaddr *sa = addr;
 211         int ret;
 212
 213         if (ieee80211_sdata_running(sdata))
 214                 return -EBUSY;
 215
 216         ret = ieee80211_verify_mac(sdata, sa->sa_data);
 217         if (ret)
 218                 return ret;
 219
 220         ret = eth_mac_addr(dev, sa);
 221
 222         if (ret == 0)
 223                 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
 224
 225         return ret;
 226 }
 227
 228 static inline int identical_mac_addr_allowed(int type1, int type2)
 229 {
 230         return type1 == NL80211_IFTYPE_MONITOR ||
 231                 type2 == NL80211_IFTYPE_MONITOR ||
 232                 type1 == NL80211_IFTYPE_P2P_DEVICE ||
 233                 type2 == NL80211_IFTYPE_P2P_DEVICE ||
 234                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
 235                 (type1 == NL80211_IFTYPE_WDS &&
 236                         (type2 == NL80211_IFTYPE_WDS ||
 237                          type2 == NL80211_IFTYPE_AP)) ||
 238                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
 239                 (type1 == NL80211_IFTYPE_AP_VLAN &&
 240                         (type2 == NL80211_IFTYPE_AP ||
 241                          type2 == NL80211_IFTYPE_AP_VLAN));
 242 }
 243
 244 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
 245                                             enum nl80211_iftype iftype)
 246 {
 247         struct ieee80211_local *local = sdata->local;
 248         struct ieee80211_sub_if_data *nsdata;
 249
 250         ASSERT_RTNL();
 251
 252         /* we hold the RTNL here so can safely walk the list */
 253         list_for_each_entry(nsdata, &local->interfaces, list) {
 254                 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
 255                         /*
 256                          * Allow only a single IBSS interface to be up at any
 257                          * time. This is restricted because beacon distribution
 258                          * cannot work properly if both are in the same IBSS.
 259                          *
 260                          * To remove this restriction we'd have to disallow them
 261                          * from setting the same SSID on different IBSS interfaces
 262                          * belonging to the same hardware. Then, however, we're
 263                          * faced with having to adopt two different TSF timers...
 264                          */
 265                         if (iftype == NL80211_IFTYPE_ADHOC &&
 266                             nsdata->vif.type == NL80211_IFTYPE_ADHOC)
 267                                 return -EBUSY;
 268
 269                         /*
 270                          * The remaining checks are only performed for interfaces
 271                          * with the same MAC address.
 272                          */
 273                         if (!ether_addr_equal(sdata->vif.addr,
 274                                               nsdata->vif.addr))
 275                                 continue;
 276
 277                         /*
 278                          * check whether it may have the same address
 279                          */
 280                         if (!identical_mac_addr_allowed(iftype,
 281                                                         nsdata->vif.type))
 282                                 return -ENOTUNIQ;
 283
 284                         /*
 285                          * can only add VLANs to enabled APs
 286                          */
 287                         if (iftype == NL80211_IFTYPE_AP_VLAN &&
 288                             nsdata->vif.type == NL80211_IFTYPE_AP)
 289                                 sdata->bss = &nsdata->u.ap;
 290                 }
 291         }
 292
 293         return 0;
 294 }
 295
 296 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata)
 297 {
 298         int n_queues = sdata->local->hw.queues;
 299         int i;
 300
 301         if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) {
 302                 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 303                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
 304                                          IEEE80211_INVAL_HW_QUEUE))
 305                                 return -EINVAL;
 306                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
 307                                          n_queues))
 308                                 return -EINVAL;
 309                 }
 310         }
 311
 312         if ((sdata->vif.type != NL80211_IFTYPE_AP &&
 313              sdata->vif.type != NL80211_IFTYPE_MESH_POINT) ||
 314             !(sdata->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)) {
 315                 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
 316                 return 0;
 317         }
 318
 319         if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
 320                 return -EINVAL;
 321
 322         if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
 323                 return -EINVAL;
 324
 325         return 0;
 326 }
 327
 328 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
 329                                     const int offset)
 330 {
 331         struct ieee80211_local *local = sdata->local;
 332         u32 flags = sdata->u.mntr_flags;
 333
 334 #define ADJUST(_f, _s)  do {                                    \
 335         if (flags & MONITOR_FLAG_##_f)                          \
 336                 local->fif_##_s += offset;                      \
 337         } while (0)
 338
 339         ADJUST(FCSFAIL, fcsfail);
 340         ADJUST(PLCPFAIL, plcpfail);
 341         ADJUST(CONTROL, control);
 342         ADJUST(CONTROL, pspoll);
 343         ADJUST(OTHER_BSS, other_bss);
 344
 345 #undef ADJUST
 346 }
 347
 348 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
 349 {
 350         struct ieee80211_local *local = sdata->local;
 351         int i;
 352
 353         for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 354                 if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
 355                         sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
 356                 else if (local->hw.queues >= IEEE80211_NUM_ACS)
 357                         sdata->vif.hw_queue[i] = i;
 358                 else
 359                         sdata->vif.hw_queue[i] = 0;
 360         }
 361         sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
 362 }
 363
 364 int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
 365 {
 366         struct ieee80211_sub_if_data *sdata;
 367         int ret;
 368
 369         if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
 370                 return 0;
 371
 372         ASSERT_RTNL();
 373
 374         if (local->monitor_sdata)
 375                 return 0;
 376
 377         sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
 378         if (!sdata)
 379                 return -ENOMEM;
 380
 381         /* set up data */
 382         sdata->local = local;
 383         sdata->vif.type = NL80211_IFTYPE_MONITOR;
 384         snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
 385                  wiphy_name(local->hw.wiphy));
 386
 387         ieee80211_set_default_queues(sdata);
 388
 389         ret = drv_add_interface(local, sdata);
 390         if (WARN_ON(ret)) {
 391                 /* ok .. stupid driver, it asked for this! */
 392                 kfree(sdata);
 393                 return ret;
 394         }
 395
 396         ret = ieee80211_check_queues(sdata);
 397         if (ret) {
 398                 kfree(sdata);
 399                 return ret;
 400         }
 401
 402         ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef,
 403                                         IEEE80211_CHANCTX_EXCLUSIVE);
 404         if (ret) {
 405                 drv_remove_interface(local, sdata);
 406                 kfree(sdata);
 407                 return ret;
 408         }
 409
 410         mutex_lock(&local->iflist_mtx);
 411         rcu_assign_pointer(local->monitor_sdata, sdata);
 412         mutex_unlock(&local->iflist_mtx);
 413
 414         return 0;
 415 }
 416
 417 void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
 418 {
 419         struct ieee80211_sub_if_data *sdata;
 420
 421         if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
 422                 return;
 423
 424         ASSERT_RTNL();
 425
 426         mutex_lock(&local->iflist_mtx);
 427
 428         sdata = rcu_dereference_protected(local->monitor_sdata,
 429                                           lockdep_is_held(&local->iflist_mtx));
 430         if (!sdata) {
 431                 mutex_unlock(&local->iflist_mtx);
 432                 return;
 433         }
 434
 435         rcu_assign_pointer(local->monitor_sdata, NULL);
 436         mutex_unlock(&local->iflist_mtx);
 437
 438         synchronize_net();
 439
 440         ieee80211_vif_release_channel(sdata);
 441
 442         drv_remove_interface(local, sdata);
 443
 444         kfree(sdata);
 445 }
 446
 447 /*
 448  * NOTE: Be very careful when changing this function, it must NOT return
 449  * an error on interface type changes that have been pre-checked, so most
 450  * checks should be in ieee80211_check_concurrent_iface.
 451  */
 452 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
 453 {
 454         struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
 455         struct net_device *dev = wdev->netdev;
 456         struct ieee80211_local *local = sdata->local;
 457         struct sta_info *sta;
 458         u32 changed = 0;
 459         int res;
 460         u32 hw_reconf_flags = 0;
 461
 462         switch (sdata->vif.type) {
 463         case NL80211_IFTYPE_WDS:
 464                 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
 465                         return -ENOLINK;
 466                 break;
 467         case NL80211_IFTYPE_AP_VLAN: {
 468                 struct ieee80211_sub_if_data *master;
 469
 470                 if (!sdata->bss)
 471                         return -ENOLINK;
 472
 473                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
 474
 475                 master = container_of(sdata->bss,
 476                                       struct ieee80211_sub_if_data, u.ap);
 477                 sdata->control_port_protocol =
 478                         master->control_port_protocol;
 479                 sdata->control_port_no_encrypt =
 480                         master->control_port_no_encrypt;
 481                 sdata->vif.cab_queue = master->vif.cab_queue;
 482                 memcpy(sdata->vif.hw_queue, master->vif.hw_queue,
 483                        sizeof(sdata->vif.hw_queue));
 484                 break;
 485                 }
 486         case NL80211_IFTYPE_AP:
 487                 sdata->bss = &sdata->u.ap;
 488                 break;
 489         case NL80211_IFTYPE_MESH_POINT:
 490         case NL80211_IFTYPE_STATION:
 491         case NL80211_IFTYPE_MONITOR:
 492         case NL80211_IFTYPE_ADHOC:
 493         case NL80211_IFTYPE_P2P_DEVICE:
 494                 /* no special treatment */
 495                 break;
 496         case NL80211_IFTYPE_UNSPECIFIED:
 497         case NUM_NL80211_IFTYPES:
 498         case NL80211_IFTYPE_P2P_CLIENT:
 499         case NL80211_IFTYPE_P2P_GO:
 500                 /* cannot happen */
 501                 WARN_ON(1);
 502                 break;
 503         }
 504
 505         if (local->open_count == 0) {
 506                 res = drv_start(local);
 507                 if (res)
 508                         goto err_del_bss;
 509                 /* we're brought up, everything changes */
 510                 hw_reconf_flags = ~0;
 511                 ieee80211_led_radio(local, true);
 512                 ieee80211_mod_tpt_led_trig(local,
 513                                            IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
 514         }
 515
 516         /*
 517          * Copy the hopefully now-present MAC address to
 518          * this interface, if it has the special null one.
 519          */
 520         if (dev && is_zero_ether_addr(dev->dev_addr)) {
 521                 memcpy(dev->dev_addr,
 522                        local->hw.wiphy->perm_addr,
 523                        ETH_ALEN);
 524                 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
 525
 526                 if (!is_valid_ether_addr(dev->dev_addr)) {
 527                         res = -EADDRNOTAVAIL;
 528                         goto err_stop;
 529                 }
 530         }
 531
 532         switch (sdata->vif.type) {
 533         case NL80211_IFTYPE_AP_VLAN:
 534                 /* no need to tell driver, but set carrier and chanctx */
 535                 if (rtnl_dereference(sdata->bss->beacon)) {
 536                         ieee80211_vif_vlan_copy_chanctx(sdata);
 537                         netif_carrier_on(dev);
 538                 } else {
 539                         netif_carrier_off(dev);
 540                 }
 541                 break;
 542         case NL80211_IFTYPE_MONITOR:
 543                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 544                         local->cooked_mntrs++;
 545                         break;
 546                 }
 547
 548                 if (local->monitors == 0 && local->open_count == 0) {
 549                         res = ieee80211_add_virtual_monitor(local);
 550                         if (res)
 551                                 goto err_stop;
 552                 }
 553
 554                 /* must be before the call to ieee80211_configure_filter */
 555                 local->monitors++;
 556                 if (local->monitors == 1) {
 557                         local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
 558                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 559                 }
 560
 561                 ieee80211_adjust_monitor_flags(sdata, 1);
 562                 ieee80211_configure_filter(local);
 563                 mutex_lock(&local->mtx);
 564                 ieee80211_recalc_idle(local);
 565                 mutex_unlock(&local->mtx);
 566
 567                 netif_carrier_on(dev);
 568                 break;
 569         default:
 570                 if (coming_up) {
 571                         ieee80211_del_virtual_monitor(local);
 572
 573                         res = drv_add_interface(local, sdata);
 574                         if (res)
 575                                 goto err_stop;
 576                         res = ieee80211_check_queues(sdata);
 577                         if (res)
 578                                 goto err_del_interface;
 579                 }
 580
 581                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
 582                         local->fif_pspoll++;
 583                         local->fif_probe_req++;
 584
 585                         ieee80211_configure_filter(local);
 586                 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 587                         local->fif_probe_req++;
 588                 }
 589
 590                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
 591                         changed |= ieee80211_reset_erp_info(sdata);
 592                 ieee80211_bss_info_change_notify(sdata, changed);
 593
 594                 switch (sdata->vif.type) {
 595                 case NL80211_IFTYPE_STATION:
 596                 case NL80211_IFTYPE_ADHOC:
 597                 case NL80211_IFTYPE_AP:
 598                 case NL80211_IFTYPE_MESH_POINT:
 599                         netif_carrier_off(dev);
 600                         break;
 601                 case NL80211_IFTYPE_WDS:
 602                 case NL80211_IFTYPE_P2P_DEVICE:
 603                         break;
 604                 default:
 605                         /* not reached */
 606                         WARN_ON(1);
 607                 }
 608
 609                 /*
 610                  * set default queue parameters so drivers don't
 611                  * need to initialise the hardware if the hardware
 612                  * doesn't start up with sane defaults
 613                  */
 614                 ieee80211_set_wmm_default(sdata, true);
 615         }
 616
 617         set_bit(SDATA_STATE_RUNNING, &sdata->state);
 618
 619         if (sdata->vif.type == NL80211_IFTYPE_WDS) {
 620                 /* Create STA entry for the WDS peer */
 621                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
 622                                      GFP_KERNEL);
 623                 if (!sta) {
 624                         res = -ENOMEM;
 625                         goto err_del_interface;
 626                 }
 627
 628                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
 629                 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
 630                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
 631
 632                 res = sta_info_insert(sta);
 633                 if (res) {
 634                         /* STA has been freed */
 635                         goto err_del_interface;
 636                 }
 637
 638                 rate_control_rate_init(sta);
 639                 netif_carrier_on(dev);
 640         } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
 641                 rcu_assign_pointer(local->p2p_sdata, sdata);
 642         }
 643
 644         /*
 645          * set_multicast_list will be invoked by the networking core
 646          * which will check whether any increments here were done in
 647          * error and sync them down to the hardware as filter flags.
 648          */
 649         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 650                 atomic_inc(&local->iff_allmultis);
 651
 652         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 653                 atomic_inc(&local->iff_promiscs);
 654
 655         if (coming_up)
 656                 local->open_count++;
 657
 658         if (hw_reconf_flags)
 659                 ieee80211_hw_config(local, hw_reconf_flags);
 660
 661         ieee80211_recalc_ps(local, -1);
 662
 663         if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
 664             sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 665                 /* XXX: for AP_VLAN, actually track AP queues */
 666                 netif_tx_start_all_queues(dev);
 667         } else if (dev) {
 668                 unsigned long flags;
 669                 int n_acs = IEEE80211_NUM_ACS;
 670                 int ac;
 671
 672                 if (local->hw.queues < IEEE80211_NUM_ACS)
 673                         n_acs = 1;
 674
 675                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 676                 if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE ||
 677                     (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 &&
 678                      skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) {
 679                         for (ac = 0; ac < n_acs; ac++) {
 680                                 int ac_queue = sdata->vif.hw_queue[ac];
 681
 682                                 if (local->queue_stop_reasons[ac_queue] == 0 &&
 683                                     skb_queue_empty(&local->pending[ac_queue]))
 684                                         netif_start_subqueue(dev, ac);
 685                         }
 686                 }
 687                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 688         }
 689
 690         return 0;
 691  err_del_interface:
 692         drv_remove_interface(local, sdata);
 693  err_stop:
 694         if (!local->open_count)
 695                 drv_stop(local);
 696  err_del_bss:
 697         sdata->bss = NULL;
 698         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
 699                 list_del(&sdata->u.vlan.list);
 700         /* might already be clear but that doesn't matter */
 701         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 702         return res;
 703 }
 704
 705 static int ieee80211_open(struct net_device *dev)
 706 {
 707         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 708         int err;
 709
 710         /* fail early if user set an invalid address */
 711         if (!is_valid_ether_addr(dev->dev_addr))
 712                 return -EADDRNOTAVAIL;
 713
 714         err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
 715         if (err)
 716                 return err;
 717
 718         return ieee80211_do_open(&sdata->wdev, true);
 719 }
 720
 721 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
 722                               bool going_down)
 723 {
 724         struct ieee80211_local *local = sdata->local;
 725         unsigned long flags;
 726         struct sk_buff *skb, *tmp;
 727         u32 hw_reconf_flags = 0;
 728         int i, flushed;
 729         struct ps_data *ps;
 730
 731         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 732
 733         if (rcu_access_pointer(local->scan_sdata) == sdata)
 734                 ieee80211_scan_cancel(local);
 735
 736         /*
 737          * Stop TX on this interface first.
 738          */
 739         if (sdata->dev)
 740                 netif_tx_stop_all_queues(sdata->dev);
 741
 742         ieee80211_roc_purge(local, sdata);
 743
 744         if (sdata->vif.type == NL80211_IFTYPE_STATION)
 745                 ieee80211_mgd_stop(sdata);
 746
 747         /*
 748          * Remove all stations associated with this interface.
 749          *
 750          * This must be done before calling ops->remove_interface()
 751          * because otherwise we can later invoke ops->sta_notify()
 752          * whenever the STAs are removed, and that invalidates driver
 753          * assumptions about always getting a vif pointer that is valid
 754          * (because if we remove a STA after ops->remove_interface()
 755          * the driver will have removed the vif info already!)
 756          *
 757          * This is relevant only in WDS mode, in all other modes we've
 758          * already removed all stations when disconnecting or similar,
 759          * so warn otherwise.
 760          *
 761          * We call sta_info_flush_cleanup() later, to combine RCU waits.
 762          */
 763         flushed = sta_info_flush_defer(sdata);
 764         WARN_ON_ONCE((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) ||
 765                      (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1));
 766
 767         /* don't count this interface for promisc/allmulti while it is down */
 768         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 769                 atomic_dec(&local->iff_allmultis);
 770
 771         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 772                 atomic_dec(&local->iff_promiscs);
 773
 774         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 775                 local->fif_pspoll--;
 776                 local->fif_probe_req--;
 777         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 778                 local->fif_probe_req--;
 779         }
 780
 781         if (sdata->dev) {
 782                 netif_addr_lock_bh(sdata->dev);
 783                 spin_lock_bh(&local->filter_lock);
 784                 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
 785                                  sdata->dev->addr_len);
 786                 spin_unlock_bh(&local->filter_lock);
 787                 netif_addr_unlock_bh(sdata->dev);
 788         }
 789
 790         del_timer_sync(&local->dynamic_ps_timer);
 791         cancel_work_sync(&local->dynamic_ps_enable_work);
 792
 793         cancel_work_sync(&sdata->recalc_smps);
 794
 795         cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
 796
 797         if (sdata->wdev.cac_started) {
 798                 WARN_ON(local->suspended);
 799                 mutex_lock(&local->iflist_mtx);
 800                 ieee80211_vif_release_channel(sdata);
 801                 mutex_unlock(&local->iflist_mtx);
 802                 cfg80211_cac_event(sdata->dev, NL80211_RADAR_CAC_ABORTED,
 803                                    GFP_KERNEL);
 804         }
 805
 806         /* APs need special treatment */
 807         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 808                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
 809
 810                 /* down all dependent devices, that is VLANs */
 811                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
 812                                          u.vlan.list)
 813                         dev_close(vlan->dev);
 814                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
 815         } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 816                 /* remove all packets in parent bc_buf pointing to this dev */
 817                 ps = &sdata->bss->ps;
 818
 819                 spin_lock_irqsave(&ps->bc_buf.lock, flags);
 820                 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
 821                         if (skb->dev == sdata->dev) {
 822                                 __skb_unlink(skb, &ps->bc_buf);
 823                                 local->total_ps_buffered--;
 824                                 ieee80211_free_txskb(&local->hw, skb);
 825                         }
 826                 }
 827                 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
 828         }
 829
 830         if (going_down)
 831                 local->open_count--;
 832
 833         switch (sdata->vif.type) {
 834         case NL80211_IFTYPE_AP_VLAN:
 835                 list_del(&sdata->u.vlan.list);
 836                 rcu_assign_pointer(sdata->vif.chanctx_conf, NULL);
 837                 /* no need to tell driver */
 838                 break;
 839         case NL80211_IFTYPE_MONITOR:
 840                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 841                         local->cooked_mntrs--;
 842                         break;
 843                 }
 844
 845                 local->monitors--;
 846                 if (local->monitors == 0) {
 847                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
 848                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 849                 }
 850
 851                 ieee80211_adjust_monitor_flags(sdata, -1);
 852                 break;
 853         case NL80211_IFTYPE_P2P_DEVICE:
 854                 /* relies on synchronize_rcu() below */
 855                 rcu_assign_pointer(local->p2p_sdata, NULL);
 856                 /* fall through */
 857         default:
 858                 cancel_work_sync(&sdata->work);
 859                 /*
 860                  * When we get here, the interface is marked down.
 861                  *
 862                  * sta_info_flush_cleanup() requires rcu_barrier()
 863                  * first to wait for the station call_rcu() calls
 864                  * to complete, and we also need synchronize_rcu()
 865                  * to wait for the RX path in case it is using the
 866                  * interface and enqueuing frames at this very time on
 867                  * another CPU.
 868                  */
 869                 synchronize_rcu();
 870                 rcu_barrier();
 871                 sta_info_flush_cleanup(sdata);
 872
 873                 /*
 874                  * Free all remaining keys, there shouldn't be any,
 875                  * except maybe in WDS mode?
 876                  */
 877                 ieee80211_free_keys(sdata);
 878
 879                 /* fall through */
 880         case NL80211_IFTYPE_AP:
 881                 skb_queue_purge(&sdata->skb_queue);
 882         }
 883
 884         sdata->bss = NULL;
 885
 886         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 887         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 888                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
 889                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 890                         if (info->control.vif == &sdata->vif) {
 891                                 __skb_unlink(skb, &local->pending[i]);
 892                                 ieee80211_free_txskb(&local->hw, skb);
 893                         }
 894                 }
 895         }
 896         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 897
 898         if (local->open_count == 0)
 899                 ieee80211_clear_tx_pending(local);
 900
 901         /*
 902          * If the interface goes down while suspended, presumably because
 903          * the device was unplugged and that happens before our resume,
 904          * then the driver is already unconfigured and the remainder of
 905          * this function isn't needed.
 906          * XXX: what about WoWLAN? If the device has software state, e.g.
 907          *      memory allocated, it might expect teardown commands from
 908          *      mac80211 here?
 909          */
 910         if (local->suspended) {
 911                 WARN_ON(local->wowlan);
 912                 WARN_ON(rtnl_dereference(local->monitor_sdata));
 913                 return;
 914         }
 915
 916         switch (sdata->vif.type) {
 917         case NL80211_IFTYPE_AP_VLAN:
 918                 break;
 919         case NL80211_IFTYPE_MONITOR:
 920                 if (local->monitors == 0)
 921                         ieee80211_del_virtual_monitor(local);
 922
 923                 mutex_lock(&local->mtx);
 924                 ieee80211_recalc_idle(local);
 925                 mutex_unlock(&local->mtx);
 926                 break;
 927         default:
 928                 if (going_down)
 929                         drv_remove_interface(local, sdata);
 930         }
 931
 932         ieee80211_recalc_ps(local, -1);
 933
 934         if (local->open_count == 0) {
 935                 ieee80211_stop_device(local);
 936
 937                 /* no reconfiguring after stop! */
 938                 return;
 939         }
 940
 941         /* do after stop to avoid reconfiguring when we stop anyway */
 942         ieee80211_configure_filter(local);
 943         ieee80211_hw_config(local, hw_reconf_flags);
 944
 945         if (local->monitors == local->open_count)
 946                 ieee80211_add_virtual_monitor(local);
 947 }
 948
 949 static int ieee80211_stop(struct net_device *dev)
 950 {
 951         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 952
 953         ieee80211_do_stop(sdata, true);
 954
 955         return 0;
 956 }
 957
 958 static void ieee80211_set_multicast_list(struct net_device *dev)
 959 {
 960         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 961         struct ieee80211_local *local = sdata->local;
 962         int allmulti, promisc, sdata_allmulti, sdata_promisc;
 963
 964         allmulti = !!(dev->flags & IFF_ALLMULTI);
 965         promisc = !!(dev->flags & IFF_PROMISC);
 966         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
 967         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
 968
 969         if (allmulti != sdata_allmulti) {
 970                 if (dev->flags & IFF_ALLMULTI)
 971                         atomic_inc(&local->iff_allmultis);
 972                 else
 973                         atomic_dec(&local->iff_allmultis);
 974                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
 975         }
 976
 977         if (promisc != sdata_promisc) {
 978                 if (dev->flags & IFF_PROMISC)
 979                         atomic_inc(&local->iff_promiscs);
 980                 else
 981                         atomic_dec(&local->iff_promiscs);
 982                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
 983         }
 984
 985         /*
 986          * TODO: If somebody needs this on AP interfaces,
 987          *       it can be enabled easily but multicast
 988          *       addresses from VLANs need to be synced.
 989          */
 990         if (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
 991             sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
 992             sdata->vif.type != NL80211_IFTYPE_AP)
 993                 drv_set_multicast_list(local, sdata, &dev->mc);
 994
 995         spin_lock_bh(&local->filter_lock);
 996         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
 997         spin_unlock_bh(&local->filter_lock);
 998         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
 999 }
1000
1001 /*
1002  * Called when the netdev is removed or, by the code below, before
1003  * the interface type changes.
1004  */
1005 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
1006 {
1007         int flushed;
1008         int i;
1009
1010         /* free extra data */
1011         ieee80211_free_keys(sdata);
1012
1013         ieee80211_debugfs_remove_netdev(sdata);
1014
1015         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1016                 __skb_queue_purge(&sdata->fragments[i].skb_list);
1017         sdata->fragment_next = 0;
1018
1019         if (ieee80211_vif_is_mesh(&sdata->vif))
1020                 mesh_rmc_free(sdata);
1021
1022         flushed = sta_info_flush(sdata);
1023         WARN_ON(flushed);
1024 }
1025
1026 static void ieee80211_uninit(struct net_device *dev)
1027 {
1028         ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
1029 }
1030
1031 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
1032                                          struct sk_buff *skb)
1033 {
1034         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
1035 }
1036
1037 static const struct net_device_ops ieee80211_dataif_ops = {
1038         .ndo_open               = ieee80211_open,
1039         .ndo_stop               = ieee80211_stop,
1040         .ndo_uninit             = ieee80211_uninit,
1041         .ndo_start_xmit         = ieee80211_subif_start_xmit,
1042         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1043         .ndo_change_mtu         = ieee80211_change_mtu,
1044         .ndo_set_mac_address    = ieee80211_change_mac,
1045         .ndo_select_queue       = ieee80211_netdev_select_queue,
1046 };
1047
1048 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
1049                                           struct sk_buff *skb)
1050 {
1051         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1052         struct ieee80211_local *local = sdata->local;
1053         struct ieee80211_hdr *hdr;
1054         struct ieee80211_radiotap_header *rtap = (void *)skb->data;
1055
1056         if (local->hw.queues < IEEE80211_NUM_ACS)
1057                 return 0;
1058
1059         if (skb->len < 4 ||
1060             skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
1061                 return 0; /* doesn't matter, frame will be dropped */
1062
1063         hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
1064
1065         return ieee80211_select_queue_80211(sdata, skb, hdr);
1066 }
1067
1068 static const struct net_device_ops ieee80211_monitorif_ops = {
1069         .ndo_open               = ieee80211_open,
1070         .ndo_stop               = ieee80211_stop,
1071         .ndo_uninit             = ieee80211_uninit,
1072         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
1073         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1074         .ndo_change_mtu         = ieee80211_change_mtu,
1075         .ndo_set_mac_address    = eth_mac_addr,
1076         .ndo_select_queue       = ieee80211_monitor_select_queue,
1077 };
1078
1079 static void ieee80211_if_setup(struct net_device *dev)
1080 {
1081         ether_setup(dev);
1082         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1083         dev->netdev_ops = &ieee80211_dataif_ops;
1084         dev->destructor = free_netdev;
1085 }
1086
1087 static void ieee80211_iface_work(struct work_struct *work)
1088 {
1089         struct ieee80211_sub_if_data *sdata =
1090                 container_of(work, struct ieee80211_sub_if_data, work);
1091         struct ieee80211_local *local = sdata->local;
1092         struct sk_buff *skb;
1093         struct sta_info *sta;
1094         struct ieee80211_ra_tid *ra_tid;
1095
1096         if (!ieee80211_sdata_running(sdata))
1097                 return;
1098
1099         if (local->scanning)
1100                 return;
1101
1102         /*
1103          * ieee80211_queue_work() should have picked up most cases,
1104          * here we'll pick the rest.
1105          */
1106         if (WARN(local->suspended,
1107                  "interface work scheduled while going to suspend\n"))
1108                 return;
1109
1110         /* first process frames */
1111         while ((skb = skb_dequeue(&sdata->skb_queue))) {
1112                 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1113
1114                 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
1115                         ra_tid = (void *)&skb->cb;
1116                         ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
1117                                                  ra_tid->tid);
1118                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
1119                         ra_tid = (void *)&skb->cb;
1120                         ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
1121                                                 ra_tid->tid);
1122                 } else if (ieee80211_is_action(mgmt->frame_control) &&
1123                            mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1124                         int len = skb->len;
1125
1126                         mutex_lock(&local->sta_mtx);
1127                         sta = sta_info_get_bss(sdata, mgmt->sa);
1128                         if (sta) {
1129                                 switch (mgmt->u.action.u.addba_req.action_code) {
1130                                 case WLAN_ACTION_ADDBA_REQ:
1131                                         ieee80211_process_addba_request(
1132                                                         local, sta, mgmt, len);
1133                                         break;
1134                                 case WLAN_ACTION_ADDBA_RESP:
1135                                         ieee80211_process_addba_resp(local, sta,
1136                                                                      mgmt, len);
1137                                         break;
1138                                 case WLAN_ACTION_DELBA:
1139                                         ieee80211_process_delba(sdata, sta,
1140                                                                 mgmt, len);
1141                                         break;
1142                                 default:
1143                                         WARN_ON(1);
1144                                         break;
1145                                 }
1146                         }
1147                         mutex_unlock(&local->sta_mtx);
1148                 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1149                         struct ieee80211_hdr *hdr = (void *)mgmt;
1150                         /*
1151                          * So the frame isn't mgmt, but frame_control
1152                          * is at the right place anyway, of course, so
1153                          * the if statement is correct.
1154                          *
1155                          * Warn if we have other data frame types here,
1156                          * they must not get here.
1157                          */
1158                         WARN_ON(hdr->frame_control &
1159                                         cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1160                         WARN_ON(!(hdr->seq_ctrl &
1161                                         cpu_to_le16(IEEE80211_SCTL_FRAG)));
1162                         /*
1163                          * This was a fragment of a frame, received while
1164                          * a block-ack session was active. That cannot be
1165                          * right, so terminate the session.
1166                          */
1167                         mutex_lock(&local->sta_mtx);
1168                         sta = sta_info_get_bss(sdata, mgmt->sa);
1169                         if (sta) {
1170                                 u16 tid = *ieee80211_get_qos_ctl(hdr) &
1171                                                 IEEE80211_QOS_CTL_TID_MASK;
1172
1173                                 __ieee80211_stop_rx_ba_session(
1174                                         sta, tid, WLAN_BACK_RECIPIENT,
1175                                         WLAN_REASON_QSTA_REQUIRE_SETUP,
1176                                         true);
1177                         }
1178                         mutex_unlock(&local->sta_mtx);
1179                 } else switch (sdata->vif.type) {
1180                 case NL80211_IFTYPE_STATION:
1181                         ieee80211_sta_rx_queued_mgmt(sdata, skb);
1182                         break;
1183                 case NL80211_IFTYPE_ADHOC:
1184                         ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1185                         break;
1186                 case NL80211_IFTYPE_MESH_POINT:
1187                         if (!ieee80211_vif_is_mesh(&sdata->vif))
1188                                 break;
1189                         ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1190                         break;
1191                 default:
1192                         WARN(1, "frame for unexpected interface type");
1193                         break;
1194                 }
1195
1196                 kfree_skb(skb);
1197         }
1198
1199         /* then other type-dependent work */
1200         switch (sdata->vif.type) {
1201         case NL80211_IFTYPE_STATION:
1202                 ieee80211_sta_work(sdata);
1203                 break;
1204         case NL80211_IFTYPE_ADHOC:
1205                 ieee80211_ibss_work(sdata);
1206                 break;
1207         case NL80211_IFTYPE_MESH_POINT:
1208                 if (!ieee80211_vif_is_mesh(&sdata->vif))
1209                         break;
1210                 ieee80211_mesh_work(sdata);
1211                 break;
1212         default:
1213                 break;
1214         }
1215 }
1216
1217 static void ieee80211_recalc_smps_work(struct work_struct *work)
1218 {
1219         struct ieee80211_sub_if_data *sdata =
1220                 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1221
1222         ieee80211_recalc_smps(sdata);
1223 }
1224
1225 /*
1226  * Helper function to initialise an interface to a specific type.
1227  */
1228 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1229                                   enum nl80211_iftype type)
1230 {
1231         /* clear type-dependent union */
1232         memset(&sdata->u, 0, sizeof(sdata->u));
1233
1234         /* and set some type-dependent values */
1235         sdata->vif.type = type;
1236         sdata->vif.p2p = false;
1237         sdata->wdev.iftype = type;
1238
1239         sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1240         sdata->control_port_no_encrypt = false;
1241
1242         sdata->noack_map = 0;
1243
1244         /* only monitor/p2p-device differ */
1245         if (sdata->dev) {
1246                 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1247                 sdata->dev->type = ARPHRD_ETHER;
1248         }
1249
1250         skb_queue_head_init(&sdata->skb_queue);
1251         INIT_WORK(&sdata->work, ieee80211_iface_work);
1252         INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1253
1254         switch (type) {
1255         case NL80211_IFTYPE_P2P_GO:
1256                 type = NL80211_IFTYPE_AP;
1257                 sdata->vif.type = type;
1258                 sdata->vif.p2p = true;
1259                 /* fall through */
1260         case NL80211_IFTYPE_AP:
1261                 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1262                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1263                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1264                 break;
1265         case NL80211_IFTYPE_P2P_CLIENT:
1266                 type = NL80211_IFTYPE_STATION;
1267                 sdata->vif.type = type;
1268                 sdata->vif.p2p = true;
1269                 /* fall through */
1270         case NL80211_IFTYPE_STATION:
1271                 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1272                 ieee80211_sta_setup_sdata(sdata);
1273                 break;
1274         case NL80211_IFTYPE_ADHOC:
1275                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1276                 ieee80211_ibss_setup_sdata(sdata);
1277                 break;
1278         case NL80211_IFTYPE_MESH_POINT:
1279                 if (ieee80211_vif_is_mesh(&sdata->vif))
1280                         ieee80211_mesh_init_sdata(sdata);
1281                 break;
1282         case NL80211_IFTYPE_MONITOR:
1283                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1284                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1285                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
1286                                       MONITOR_FLAG_OTHER_BSS;
1287                 break;
1288         case NL80211_IFTYPE_WDS:
1289                 sdata->vif.bss_conf.bssid = NULL;
1290                 break;
1291         case NL80211_IFTYPE_AP_VLAN:
1292                 break;
1293         case NL80211_IFTYPE_P2P_DEVICE:
1294                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1295                 break;
1296         case NL80211_IFTYPE_UNSPECIFIED:
1297         case NUM_NL80211_IFTYPES:
1298                 BUG();
1299                 break;
1300         }
1301
1302         ieee80211_debugfs_add_netdev(sdata);
1303 }
1304
1305 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1306                                            enum nl80211_iftype type)
1307 {
1308         struct ieee80211_local *local = sdata->local;
1309         int ret, err;
1310         enum nl80211_iftype internal_type = type;
1311         bool p2p = false;
1312
1313         ASSERT_RTNL();
1314
1315         if (!local->ops->change_interface)
1316                 return -EBUSY;
1317
1318         switch (sdata->vif.type) {
1319         case NL80211_IFTYPE_AP:
1320         case NL80211_IFTYPE_STATION:
1321         case NL80211_IFTYPE_ADHOC:
1322                 /*
1323                  * Could maybe also all others here?
1324                  * Just not sure how that interacts
1325                  * with the RX/config path e.g. for
1326                  * mesh.
1327                  */
1328                 break;
1329         default:
1330                 return -EBUSY;
1331         }
1332
1333         switch (type) {
1334         case NL80211_IFTYPE_AP:
1335         case NL80211_IFTYPE_STATION:
1336         case NL80211_IFTYPE_ADHOC:
1337                 /*
1338                  * Could probably support everything
1339                  * but WDS here (WDS do_open can fail
1340                  * under memory pressure, which this
1341                  * code isn't prepared to handle).
1342                  */
1343                 break;
1344         case NL80211_IFTYPE_P2P_CLIENT:
1345                 p2p = true;
1346                 internal_type = NL80211_IFTYPE_STATION;
1347                 break;
1348         case NL80211_IFTYPE_P2P_GO:
1349                 p2p = true;
1350                 internal_type = NL80211_IFTYPE_AP;
1351                 break;
1352         default:
1353                 return -EBUSY;
1354         }
1355
1356         ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1357         if (ret)
1358                 return ret;
1359
1360         ieee80211_do_stop(sdata, false);
1361
1362         ieee80211_teardown_sdata(sdata);
1363
1364         ret = drv_change_interface(local, sdata, internal_type, p2p);
1365         if (ret)
1366                 type = sdata->vif.type;
1367
1368         /*
1369          * Ignore return value here, there's not much we can do since
1370          * the driver changed the interface type internally already.
1371          * The warnings will hopefully make driver authors fix it :-)
1372          */
1373         ieee80211_check_queues(sdata);
1374
1375         ieee80211_setup_sdata(sdata, type);
1376
1377         err = ieee80211_do_open(&sdata->wdev, false);
1378         WARN(err, "type change: do_open returned %d", err);
1379
1380         return ret;
1381 }
1382
1383 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1384                              enum nl80211_iftype type)
1385 {
1386         int ret;
1387
1388         ASSERT_RTNL();
1389
1390         if (type == ieee80211_vif_type_p2p(&sdata->vif))
1391                 return 0;
1392
1393         if (ieee80211_sdata_running(sdata)) {
1394                 ret = ieee80211_runtime_change_iftype(sdata, type);
1395                 if (ret)
1396                         return ret;
1397         } else {
1398                 /* Purge and reset type-dependent state. */
1399                 ieee80211_teardown_sdata(sdata);
1400                 ieee80211_setup_sdata(sdata, type);
1401         }
1402
1403         /* reset some values that shouldn't be kept across type changes */
1404         sdata->drop_unencrypted = 0;
1405         if (type == NL80211_IFTYPE_STATION)
1406                 sdata->u.mgd.use_4addr = false;
1407
1408         return 0;
1409 }
1410
1411 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1412                                        u8 *perm_addr, enum nl80211_iftype type)
1413 {
1414         struct ieee80211_sub_if_data *sdata;
1415         u64 mask, start, addr, val, inc;
1416         u8 *m;
1417         u8 tmp_addr[ETH_ALEN];
1418         int i;
1419
1420         /* default ... something at least */
1421         memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1422
1423         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1424             local->hw.wiphy->n_addresses <= 1)
1425                 return;
1426
1427         mutex_lock(&local->iflist_mtx);
1428
1429         switch (type) {
1430         case NL80211_IFTYPE_MONITOR:
1431                 /* doesn't matter */
1432                 break;
1433         case NL80211_IFTYPE_WDS:
1434         case NL80211_IFTYPE_AP_VLAN:
1435                 /* match up with an AP interface */
1436                 list_for_each_entry(sdata, &local->interfaces, list) {
1437                         if (sdata->vif.type != NL80211_IFTYPE_AP)
1438                                 continue;
1439                         memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1440                         break;
1441                 }
1442                 /* keep default if no AP interface present */
1443                 break;
1444         case NL80211_IFTYPE_P2P_CLIENT:
1445         case NL80211_IFTYPE_P2P_GO:
1446                 if (local->hw.flags & IEEE80211_HW_P2P_DEV_ADDR_FOR_INTF) {
1447                         list_for_each_entry(sdata, &local->interfaces, list) {
1448                                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1449                                         continue;
1450                                 if (!ieee80211_sdata_running(sdata))
1451                                         continue;
1452                                 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1453                                 goto out_unlock;
1454                         }
1455                 }
1456                 /* otherwise fall through */
1457         default:
1458                 /* assign a new address if possible -- try n_addresses first */
1459                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1460                         bool used = false;
1461
1462                         list_for_each_entry(sdata, &local->interfaces, list) {
1463                                 if (memcmp(local->hw.wiphy->addresses[i].addr,
1464                                            sdata->vif.addr, ETH_ALEN) == 0) {
1465                                         used = true;
1466                                         break;
1467                                 }
1468                         }
1469
1470                         if (!used) {
1471                                 memcpy(perm_addr,
1472                                        local->hw.wiphy->addresses[i].addr,
1473                                        ETH_ALEN);
1474                                 break;
1475                         }
1476                 }
1477
1478                 /* try mask if available */
1479                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1480                         break;
1481
1482                 m = local->hw.wiphy->addr_mask;
1483                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1484                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1485                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1486
1487                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1488                         /* not a contiguous mask ... not handled now! */
1489                         pr_info("not contiguous\n");
1490                         break;
1491                 }
1492
1493                 /*
1494                  * Pick address of existing interface in case user changed
1495                  * MAC address manually, default to perm_addr.
1496                  */
1497                 m = local->hw.wiphy->perm_addr;
1498                 list_for_each_entry(sdata, &local->interfaces, list) {
1499                         if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
1500                                 continue;
1501                         m = sdata->vif.addr;
1502                         break;
1503                 }
1504                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1505                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1506                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1507
1508                 inc = 1ULL<<__ffs64(mask);
1509                 val = (start & mask);
1510                 addr = (start & ~mask) | (val & mask);
1511                 do {
1512                         bool used = false;
1513
1514                         tmp_addr[5] = addr >> 0*8;
1515                         tmp_addr[4] = addr >> 1*8;
1516                         tmp_addr[3] = addr >> 2*8;
1517                         tmp_addr[2] = addr >> 3*8;
1518                         tmp_addr[1] = addr >> 4*8;
1519                         tmp_addr[0] = addr >> 5*8;
1520
1521                         val += inc;
1522
1523                         list_for_each_entry(sdata, &local->interfaces, list) {
1524                                 if (memcmp(tmp_addr, sdata->vif.addr,
1525                                                         ETH_ALEN) == 0) {
1526                                         used = true;
1527                                         break;
1528                                 }
1529                         }
1530
1531                         if (!used) {
1532                                 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1533                                 break;
1534                         }
1535                         addr = (start & ~mask) | (val & mask);
1536                 } while (addr != start);
1537
1538                 break;
1539         }
1540
1541  out_unlock:
1542         mutex_unlock(&local->iflist_mtx);
1543 }
1544
1545 static void ieee80211_cleanup_sdata_stas_wk(struct work_struct *wk)
1546 {
1547         struct ieee80211_sub_if_data *sdata;
1548
1549         sdata = container_of(wk, struct ieee80211_sub_if_data, cleanup_stations_wk);
1550
1551         ieee80211_cleanup_sdata_stas(sdata);
1552 }
1553
1554 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1555                      struct wireless_dev **new_wdev, enum nl80211_iftype type,
1556                      struct vif_params *params)
1557 {
1558         struct net_device *ndev = NULL;
1559         struct ieee80211_sub_if_data *sdata = NULL;
1560         int ret, i;
1561         int txqs = 1;
1562
1563         ASSERT_RTNL();
1564
1565         if (type == NL80211_IFTYPE_P2P_DEVICE) {
1566                 struct wireless_dev *wdev;
1567
1568                 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1569                                 GFP_KERNEL);
1570                 if (!sdata)
1571                         return -ENOMEM;
1572                 wdev = &sdata->wdev;
1573
1574                 sdata->dev = NULL;
1575                 strlcpy(sdata->name, name, IFNAMSIZ);
1576                 ieee80211_assign_perm_addr(local, wdev->address, type);
1577                 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1578         } else {
1579                 if (local->hw.queues >= IEEE80211_NUM_ACS)
1580                         txqs = IEEE80211_NUM_ACS;
1581
1582                 ndev = alloc_netdev_mqs(sizeof(*sdata) +
1583                                         local->hw.vif_data_size,
1584                                         name, ieee80211_if_setup, txqs, 1);
1585                 if (!ndev)
1586                         return -ENOMEM;
1587                 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1588
1589                 ndev->needed_headroom = local->tx_headroom +
1590                                         4*6 /* four MAC addresses */
1591                                         + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1592                                         + 6 /* mesh */
1593                                         + 8 /* rfc1042/bridge tunnel */
1594                                         - ETH_HLEN /* ethernet hard_header_len */
1595                                         + IEEE80211_ENCRYPT_HEADROOM;
1596                 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1597
1598                 ret = dev_alloc_name(ndev, ndev->name);
1599                 if (ret < 0) {
1600                         free_netdev(ndev);
1601                         return ret;
1602                 }
1603
1604                 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1605                 memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1606                 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1607
1608                 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1609                 sdata = netdev_priv(ndev);
1610                 ndev->ieee80211_ptr = &sdata->wdev;
1611                 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1612                 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1613
1614                 sdata->dev = ndev;
1615         }
1616
1617         /* initialise type-independent data */
1618         sdata->wdev.wiphy = local->hw.wiphy;
1619         sdata->local = local;
1620
1621         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1622                 skb_queue_head_init(&sdata->fragments[i].skb_list);
1623
1624         INIT_LIST_HEAD(&sdata->key_list);
1625
1626         spin_lock_init(&sdata->cleanup_stations_lock);
1627         INIT_LIST_HEAD(&sdata->cleanup_stations);
1628         INIT_WORK(&sdata->cleanup_stations_wk, ieee80211_cleanup_sdata_stas_wk);
1629         INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
1630                           ieee80211_dfs_cac_timer_work);
1631         INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
1632                           ieee80211_delayed_tailroom_dec);
1633
1634         for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1635                 struct ieee80211_supported_band *sband;
1636                 sband = local->hw.wiphy->bands[i];
1637                 sdata->rc_rateidx_mask[i] =
1638                         sband ? (1 << sband->n_bitrates) - 1 : 0;
1639                 if (sband)
1640                         memcpy(sdata->rc_rateidx_mcs_mask[i],
1641                                sband->ht_cap.mcs.rx_mask,
1642                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1643                 else
1644                         memset(sdata->rc_rateidx_mcs_mask[i], 0,
1645                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1646         }
1647
1648         ieee80211_set_default_queues(sdata);
1649
1650         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1651         sdata->user_power_level = local->user_power_level;
1652
1653         /* setup type-dependent data */
1654         ieee80211_setup_sdata(sdata, type);
1655
1656         if (ndev) {
1657                 if (params) {
1658                         ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1659                         if (type == NL80211_IFTYPE_STATION)
1660                                 sdata->u.mgd.use_4addr = params->use_4addr;
1661                 }
1662
1663                 ndev->features |= local->hw.netdev_features;
1664
1665                 ret = register_netdevice(ndev);
1666                 if (ret) {
1667                         free_netdev(ndev);
1668                         return ret;
1669                 }
1670         }
1671
1672         mutex_lock(&local->iflist_mtx);
1673         list_add_tail_rcu(&sdata->list, &local->interfaces);
1674         mutex_unlock(&local->iflist_mtx);
1675
1676         if (new_wdev)
1677                 *new_wdev = &sdata->wdev;
1678
1679         return 0;
1680 }
1681
1682 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1683 {
1684         ASSERT_RTNL();
1685
1686         mutex_lock(&sdata->local->iflist_mtx);
1687         list_del_rcu(&sdata->list);
1688         mutex_unlock(&sdata->local->iflist_mtx);
1689
1690         synchronize_rcu();
1691
1692         if (sdata->dev) {
1693                 unregister_netdevice(sdata->dev);
1694         } else {
1695                 cfg80211_unregister_wdev(&sdata->wdev);
1696                 kfree(sdata);
1697         }
1698 }
1699
1700 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
1701 {
1702         if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
1703                 return;
1704         ieee80211_do_stop(sdata, true);
1705         ieee80211_teardown_sdata(sdata);
1706 }
1707
1708 /*
1709  * Remove all interfaces, may only be called at hardware unregistration
1710  * time because it doesn't do RCU-safe list removals.
1711  */
1712 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1713 {
1714         struct ieee80211_sub_if_data *sdata, *tmp;
1715         LIST_HEAD(unreg_list);
1716         LIST_HEAD(wdev_list);
1717
1718         ASSERT_RTNL();
1719
1720         /*
1721          * Close all AP_VLAN interfaces first, as otherwise they
1722          * might be closed while the AP interface they belong to
1723          * is closed, causing unregister_netdevice_many() to crash.
1724          */
1725         list_for_each_entry(sdata, &local->interfaces, list)
1726                 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1727                         dev_close(sdata->dev);
1728
1729         /*
1730          * Close all AP_VLAN interfaces first, as otherwise they
1731          * might be closed while the AP interface they belong to
1732          * is closed, causing unregister_netdevice_many() to crash.
1733          */
1734         list_for_each_entry(sdata, &local->interfaces, list)
1735                 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1736                         dev_close(sdata->dev);
1737
1738         mutex_lock(&local->iflist_mtx);
1739         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1740                 list_del(&sdata->list);
1741
1742                 if (sdata->dev)
1743                         unregister_netdevice_queue(sdata->dev, &unreg_list);
1744                 else
1745                         list_add(&sdata->list, &wdev_list);
1746         }
1747         mutex_unlock(&local->iflist_mtx);
1748         unregister_netdevice_many(&unreg_list);
1749
1750         list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
1751                 list_del(&sdata->list);
1752                 cfg80211_unregister_wdev(&sdata->wdev);
1753                 kfree(sdata);
1754         }
1755 }
1756
1757 static int netdev_notify(struct notifier_block *nb,
1758                          unsigned long state,
1759                          void *ndev)
1760 {
1761         struct net_device *dev = ndev;
1762         struct ieee80211_sub_if_data *sdata;
1763
1764         if (state != NETDEV_CHANGENAME)
1765                 return 0;
1766
1767         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1768                 return 0;
1769
1770         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1771                 return 0;
1772
1773         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1774
1775         memcpy(sdata->name, dev->name, IFNAMSIZ);
1776
1777         ieee80211_debugfs_rename_netdev(sdata);
1778         return 0;
1779 }
1780
1781 static struct notifier_block mac80211_netdev_notifier = {
1782         .notifier_call = netdev_notify,
1783 };
1784
1785 int ieee80211_iface_init(void)
1786 {
1787         return register_netdevice_notifier(&mac80211_netdev_notifier);
1788 }
1789
1790 void ieee80211_iface_exit(void)
1791 {
1792         unregister_netdevice_notifier(&mac80211_netdev_notifier);
1793 }