net/mac80211/iface.c

   1 /*
   2  * Interface handling
   3  *
   4  * Copyright 2002-2005, Instant802 Networks, Inc.
   5  * Copyright 2005-2006, Devicescape Software, Inc.
   6  * Copyright (c) 2006 Jiri Benc <jbenc@suse.cz>
   7  * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13 #include <linux/slab.h>
  14 #include <linux/kernel.h>
  15 #include <linux/if_arp.h>
  16 #include <linux/netdevice.h>
  17 #include <linux/rtnetlink.h>
  18 #include <net/mac80211.h>
  19 #include <net/ieee80211_radiotap.h>
  20 #include "ieee80211_i.h"
  21 #include "sta_info.h"
  22 #include "debugfs_netdev.h"
  23 #include "mesh.h"
  24 #include "led.h"
  25 #include "driver-ops.h"
  26 #include "wme.h"
  27 #include "rate.h"
  28
  29 /**
  30  * DOC: Interface list locking
  31  *
  32  * The interface list in each struct ieee80211_local is protected
  33  * three-fold:
  34  *
  35  * (1) modifications may only be done under the RTNL
  36  * (2) modifications and readers are protected against each other by
  37  *     the iflist_mtx.
  38  * (3) modifications are done in an RCU manner so atomic readers
  39  *     can traverse the list in RCU-safe blocks.
  40  *
  41  * As a consequence, reads (traversals) of the list can be protected
  42  * by either the RTNL, the iflist_mtx or RCU.
  43  */
  44
  45 bool __ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
  46 {
  47         struct ieee80211_chanctx_conf *chanctx_conf;
  48         int power;
  49
  50         rcu_read_lock();
  51         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
  52         if (!chanctx_conf) {
  53                 rcu_read_unlock();
  54                 return false;
  55         }
  56
  57         power = ieee80211_chandef_max_power(&chanctx_conf->def);
  58         rcu_read_unlock();
  59
  60         if (sdata->user_power_level != IEEE80211_UNSET_POWER_LEVEL)
  61                 power = min(power, sdata->user_power_level);
  62
  63         if (sdata->ap_power_level != IEEE80211_UNSET_POWER_LEVEL)
  64                 power = min(power, sdata->ap_power_level);
  65
  66         if (power != sdata->vif.bss_conf.txpower) {
  67                 sdata->vif.bss_conf.txpower = power;
  68                 ieee80211_hw_config(sdata->local, 0);
  69                 return true;
  70         }
  71
  72         return false;
  73 }
  74
  75 void ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
  76 {
  77         if (__ieee80211_recalc_txpower(sdata))
  78                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_TXPOWER);
  79 }
  80
  81 static u32 __ieee80211_idle_off(struct ieee80211_local *local)
  82 {
  83         if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
  84                 return 0;
  85
  86         local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
  87         return IEEE80211_CONF_CHANGE_IDLE;
  88 }
  89
  90 static u32 __ieee80211_idle_on(struct ieee80211_local *local)
  91 {
  92         if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
  93                 return 0;
  94
  95         ieee80211_flush_queues(local, NULL);
  96
  97         local->hw.conf.flags |= IEEE80211_CONF_IDLE;
  98         return IEEE80211_CONF_CHANGE_IDLE;
  99 }
 100
 101 static u32 __ieee80211_recalc_idle(struct ieee80211_local *local,
 102                                    bool force_active)
 103 {
 104         bool working = false, scanning, active;
 105         unsigned int led_trig_start = 0, led_trig_stop = 0;
 106         struct ieee80211_roc_work *roc;
 107
 108         lockdep_assert_held(&local->mtx);
 109
 110         active = force_active ||
 111                  !list_empty(&local->chanctx_list) ||
 112                  local->monitors;
 113
 114         if (!local->ops->remain_on_channel) {
 115                 list_for_each_entry(roc, &local->roc_list, list) {
 116                         working = true;
 117                         break;
 118                 }
 119         }
 120
 121         scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) ||
 122                    test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning);
 123
 124         if (working || scanning)
 125                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
 126         else
 127                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
 128
 129         if (active)
 130                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
 131         else
 132                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
 133
 134         ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
 135
 136         if (working || scanning || active)
 137                 return __ieee80211_idle_off(local);
 138         return __ieee80211_idle_on(local);
 139 }
 140
 141 u32 ieee80211_idle_off(struct ieee80211_local *local)
 142 {
 143         return __ieee80211_recalc_idle(local, true);
 144 }
 145
 146 void ieee80211_recalc_idle(struct ieee80211_local *local)
 147 {
 148         u32 change = __ieee80211_recalc_idle(local, false);
 149         if (change)
 150                 ieee80211_hw_config(local, change);
 151 }
 152
 153 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
 154 {
 155         if (new_mtu < 256 || new_mtu > IEEE80211_MAX_DATA_LEN)
 156                 return -EINVAL;
 157
 158         dev->mtu = new_mtu;
 159         return 0;
 160 }
 161
 162 static int ieee80211_verify_mac(struct ieee80211_sub_if_data *sdata, u8 *addr,
 163                                 bool check_dup)
 164 {
 165         struct ieee80211_local *local = sdata->local;
 166         struct ieee80211_sub_if_data *iter;
 167         u64 new, mask, tmp;
 168         u8 *m;
 169         int ret = 0;
 170
 171         if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
 172                 return 0;
 173
 174         m = addr;
 175         new =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 176                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 177                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 178
 179         m = local->hw.wiphy->addr_mask;
 180         mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 181                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 182                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 183
 184         if (!check_dup)
 185                 return ret;
 186
 187         mutex_lock(&local->iflist_mtx);
 188         list_for_each_entry(iter, &local->interfaces, list) {
 189                 if (iter == sdata)
 190                         continue;
 191
 192                 if (iter->vif.type == NL80211_IFTYPE_MONITOR &&
 193                     !(iter->u.mntr_flags & MONITOR_FLAG_ACTIVE))
 194                         continue;
 195
 196                 m = iter->vif.addr;
 197                 tmp =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 198                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 199                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 200
 201                 if ((new & ~mask) != (tmp & ~mask)) {
 202                         ret = -EINVAL;
 203                         break;
 204                 }
 205         }
 206         mutex_unlock(&local->iflist_mtx);
 207
 208         return ret;
 209 }
 210
 211 static int ieee80211_change_mac(struct net_device *dev, void *addr)
 212 {
 213         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 214         struct sockaddr *sa = addr;
 215         bool check_dup = true;
 216         int ret;
 217
 218         if (ieee80211_sdata_running(sdata))
 219                 return -EBUSY;
 220
 221         if (sdata->vif.type == NL80211_IFTYPE_MONITOR &&
 222             !(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE))
 223                 check_dup = false;
 224
 225         ret = ieee80211_verify_mac(sdata, sa->sa_data, check_dup);
 226         if (ret)
 227                 return ret;
 228
 229         ret = eth_mac_addr(dev, sa);
 230
 231         if (ret == 0)
 232                 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
 233
 234         return ret;
 235 }
 236
 237 static inline int identical_mac_addr_allowed(int type1, int type2)
 238 {
 239         return type1 == NL80211_IFTYPE_MONITOR ||
 240                 type2 == NL80211_IFTYPE_MONITOR ||
 241                 type1 == NL80211_IFTYPE_P2P_DEVICE ||
 242                 type2 == NL80211_IFTYPE_P2P_DEVICE ||
 243                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
 244                 (type1 == NL80211_IFTYPE_WDS &&
 245                         (type2 == NL80211_IFTYPE_WDS ||
 246                          type2 == NL80211_IFTYPE_AP)) ||
 247                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
 248                 (type1 == NL80211_IFTYPE_AP_VLAN &&
 249                         (type2 == NL80211_IFTYPE_AP ||
 250                          type2 == NL80211_IFTYPE_AP_VLAN));
 251 }
 252
 253 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
 254                                             enum nl80211_iftype iftype)
 255 {
 256         struct ieee80211_local *local = sdata->local;
 257         struct ieee80211_sub_if_data *nsdata;
 258
 259         ASSERT_RTNL();
 260
 261         /* we hold the RTNL here so can safely walk the list */
 262         list_for_each_entry(nsdata, &local->interfaces, list) {
 263                 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
 264                         /*
 265                          * Allow only a single IBSS interface to be up at any
 266                          * time. This is restricted because beacon distribution
 267                          * cannot work properly if both are in the same IBSS.
 268                          *
 269                          * To remove this restriction we'd have to disallow them
 270                          * from setting the same SSID on different IBSS interfaces
 271                          * belonging to the same hardware. Then, however, we're
 272                          * faced with having to adopt two different TSF timers...
 273                          */
 274                         if (iftype == NL80211_IFTYPE_ADHOC &&
 275                             nsdata->vif.type == NL80211_IFTYPE_ADHOC)
 276                                 return -EBUSY;
 277                         /*
 278                          * will not add another interface while any channel
 279                          * switch is active.
 280                          */
 281                         if (nsdata->vif.csa_active)
 282                                 return -EBUSY;
 283
 284                         /*
 285                          * The remaining checks are only performed for interfaces
 286                          * with the same MAC address.
 287                          */
 288                         if (!ether_addr_equal(sdata->vif.addr,
 289                                               nsdata->vif.addr))
 290                                 continue;
 291
 292                         /*
 293                          * check whether it may have the same address
 294                          */
 295                         if (!identical_mac_addr_allowed(iftype,
 296                                                         nsdata->vif.type))
 297                                 return -ENOTUNIQ;
 298
 299                         /*
 300                          * can only add VLANs to enabled APs
 301                          */
 302                         if (iftype == NL80211_IFTYPE_AP_VLAN &&
 303                             nsdata->vif.type == NL80211_IFTYPE_AP)
 304                                 sdata->bss = &nsdata->u.ap;
 305                 }
 306         }
 307
 308         return 0;
 309 }
 310
 311 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata,
 312                                   enum nl80211_iftype iftype)
 313 {
 314         int n_queues = sdata->local->hw.queues;
 315         int i;
 316
 317         if (iftype != NL80211_IFTYPE_P2P_DEVICE) {
 318                 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 319                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
 320                                          IEEE80211_INVAL_HW_QUEUE))
 321                                 return -EINVAL;
 322                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
 323                                          n_queues))
 324                                 return -EINVAL;
 325                 }
 326         }
 327
 328         if ((iftype != NL80211_IFTYPE_AP &&
 329              iftype != NL80211_IFTYPE_P2P_GO &&
 330              iftype != NL80211_IFTYPE_MESH_POINT) ||
 331             !(sdata->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)) {
 332                 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
 333                 return 0;
 334         }
 335
 336         if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
 337                 return -EINVAL;
 338
 339         if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
 340                 return -EINVAL;
 341
 342         return 0;
 343 }
 344
 345 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
 346                                     const int offset)
 347 {
 348         struct ieee80211_local *local = sdata->local;
 349         u32 flags = sdata->u.mntr_flags;
 350
 351 #define ADJUST(_f, _s)  do {                                    \
 352         if (flags & MONITOR_FLAG_##_f)                          \
 353                 local->fif_##_s += offset;                      \
 354         } while (0)
 355
 356         ADJUST(FCSFAIL, fcsfail);
 357         ADJUST(PLCPFAIL, plcpfail);
 358         ADJUST(CONTROL, control);
 359         ADJUST(CONTROL, pspoll);
 360         ADJUST(OTHER_BSS, other_bss);
 361
 362 #undef ADJUST
 363 }
 364
 365 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
 366 {
 367         struct ieee80211_local *local = sdata->local;
 368         int i;
 369
 370         for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 371                 if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
 372                         sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
 373                 else if (local->hw.queues >= IEEE80211_NUM_ACS)
 374                         sdata->vif.hw_queue[i] = i;
 375                 else
 376                         sdata->vif.hw_queue[i] = 0;
 377         }
 378         sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
 379 }
 380
 381 int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
 382 {
 383         struct ieee80211_sub_if_data *sdata;
 384         int ret;
 385
 386         if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
 387                 return 0;
 388
 389         ASSERT_RTNL();
 390
 391         if (local->monitor_sdata)
 392                 return 0;
 393
 394         sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
 395         if (!sdata)
 396                 return -ENOMEM;
 397
 398         /* set up data */
 399         sdata->local = local;
 400         sdata->vif.type = NL80211_IFTYPE_MONITOR;
 401         snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
 402                  wiphy_name(local->hw.wiphy));
 403
 404         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
 405
 406         ieee80211_set_default_queues(sdata);
 407
 408         ret = drv_add_interface(local, sdata);
 409         if (WARN_ON(ret)) {
 410                 /* ok .. stupid driver, it asked for this! */
 411                 kfree(sdata);
 412                 return ret;
 413         }
 414
 415         ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR);
 416         if (ret) {
 417                 kfree(sdata);
 418                 return ret;
 419         }
 420
 421         ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef,
 422                                         IEEE80211_CHANCTX_EXCLUSIVE);
 423         if (ret) {
 424                 drv_remove_interface(local, sdata);
 425                 kfree(sdata);
 426                 return ret;
 427         }
 428
 429         mutex_lock(&local->iflist_mtx);
 430         rcu_assign_pointer(local->monitor_sdata, sdata);
 431         mutex_unlock(&local->iflist_mtx);
 432
 433         return 0;
 434 }
 435
 436 void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
 437 {
 438         struct ieee80211_sub_if_data *sdata;
 439
 440         if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
 441                 return;
 442
 443         ASSERT_RTNL();
 444
 445         mutex_lock(&local->iflist_mtx);
 446
 447         sdata = rcu_dereference_protected(local->monitor_sdata,
 448                                           lockdep_is_held(&local->iflist_mtx));
 449         if (!sdata) {
 450                 mutex_unlock(&local->iflist_mtx);
 451                 return;
 452         }
 453
 454         rcu_assign_pointer(local->monitor_sdata, NULL);
 455         mutex_unlock(&local->iflist_mtx);
 456
 457         synchronize_net();
 458
 459         ieee80211_vif_release_channel(sdata);
 460
 461         drv_remove_interface(local, sdata);
 462
 463         kfree(sdata);
 464 }
 465
 466 /*
 467  * NOTE: Be very careful when changing this function, it must NOT return
 468  * an error on interface type changes that have been pre-checked, so most
 469  * checks should be in ieee80211_check_concurrent_iface.
 470  */
 471 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
 472 {
 473         struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
 474         struct net_device *dev = wdev->netdev;
 475         struct ieee80211_local *local = sdata->local;
 476         struct sta_info *sta;
 477         u32 changed = 0;
 478         int res;
 479         u32 hw_reconf_flags = 0;
 480
 481         switch (sdata->vif.type) {
 482         case NL80211_IFTYPE_WDS:
 483                 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
 484                         return -ENOLINK;
 485                 break;
 486         case NL80211_IFTYPE_AP_VLAN: {
 487                 struct ieee80211_sub_if_data *master;
 488
 489                 if (!sdata->bss)
 490                         return -ENOLINK;
 491
 492                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
 493
 494                 master = container_of(sdata->bss,
 495                                       struct ieee80211_sub_if_data, u.ap);
 496                 sdata->control_port_protocol =
 497                         master->control_port_protocol;
 498                 sdata->control_port_no_encrypt =
 499                         master->control_port_no_encrypt;
 500                 sdata->vif.cab_queue = master->vif.cab_queue;
 501                 memcpy(sdata->vif.hw_queue, master->vif.hw_queue,
 502                        sizeof(sdata->vif.hw_queue));
 503                 break;
 504                 }
 505         case NL80211_IFTYPE_AP:
 506                 sdata->bss = &sdata->u.ap;
 507                 break;
 508         case NL80211_IFTYPE_MESH_POINT:
 509         case NL80211_IFTYPE_STATION:
 510         case NL80211_IFTYPE_MONITOR:
 511         case NL80211_IFTYPE_ADHOC:
 512         case NL80211_IFTYPE_P2P_DEVICE:
 513                 /* no special treatment */
 514                 break;
 515         case NL80211_IFTYPE_UNSPECIFIED:
 516         case NUM_NL80211_IFTYPES:
 517         case NL80211_IFTYPE_P2P_CLIENT:
 518         case NL80211_IFTYPE_P2P_GO:
 519                 /* cannot happen */
 520                 WARN_ON(1);
 521                 break;
 522         }
 523
 524         if (local->open_count == 0) {
 525                 res = drv_start(local);
 526                 if (res)
 527                         goto err_del_bss;
 528                 /* we're brought up, everything changes */
 529                 hw_reconf_flags = ~0;
 530                 ieee80211_led_radio(local, true);
 531                 ieee80211_mod_tpt_led_trig(local,
 532                                            IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
 533         }
 534
 535         /*
 536          * Copy the hopefully now-present MAC address to
 537          * this interface, if it has the special null one.
 538          */
 539         if (dev && is_zero_ether_addr(dev->dev_addr)) {
 540                 memcpy(dev->dev_addr,
 541                        local->hw.wiphy->perm_addr,
 542                        ETH_ALEN);
 543                 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
 544
 545                 if (!is_valid_ether_addr(dev->dev_addr)) {
 546                         res = -EADDRNOTAVAIL;
 547                         goto err_stop;
 548                 }
 549         }
 550
 551         switch (sdata->vif.type) {
 552         case NL80211_IFTYPE_AP_VLAN:
 553                 /* no need to tell driver, but set carrier and chanctx */
 554                 if (rtnl_dereference(sdata->bss->beacon)) {
 555                         ieee80211_vif_vlan_copy_chanctx(sdata);
 556                         netif_carrier_on(dev);
 557                 } else {
 558                         netif_carrier_off(dev);
 559                 }
 560                 break;
 561         case NL80211_IFTYPE_MONITOR:
 562                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 563                         local->cooked_mntrs++;
 564                         break;
 565                 }
 566
 567                 if (sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE) {
 568                         res = drv_add_interface(local, sdata);
 569                         if (res)
 570                                 goto err_stop;
 571                 } else if (local->monitors == 0 && local->open_count == 0) {
 572                         res = ieee80211_add_virtual_monitor(local);
 573                         if (res)
 574                                 goto err_stop;
 575                 }
 576
 577                 /* must be before the call to ieee80211_configure_filter */
 578                 local->monitors++;
 579                 if (local->monitors == 1) {
 580                         local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
 581                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 582                 }
 583
 584                 ieee80211_adjust_monitor_flags(sdata, 1);
 585                 ieee80211_configure_filter(local);
 586                 mutex_lock(&local->mtx);
 587                 ieee80211_recalc_idle(local);
 588                 mutex_unlock(&local->mtx);
 589
 590                 netif_carrier_on(dev);
 591                 break;
 592         default:
 593                 if (coming_up) {
 594                         ieee80211_del_virtual_monitor(local);
 595
 596                         res = drv_add_interface(local, sdata);
 597                         if (res)
 598                                 goto err_stop;
 599                         res = ieee80211_check_queues(sdata,
 600                                 ieee80211_vif_type_p2p(&sdata->vif));
 601                         if (res)
 602                                 goto err_del_interface;
 603                 }
 604
 605                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
 606                         local->fif_pspoll++;
 607                         local->fif_probe_req++;
 608
 609                         ieee80211_configure_filter(local);
 610                 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 611                         local->fif_probe_req++;
 612                 }
 613
 614                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
 615                         changed |= ieee80211_reset_erp_info(sdata);
 616                 ieee80211_bss_info_change_notify(sdata, changed);
 617
 618                 switch (sdata->vif.type) {
 619                 case NL80211_IFTYPE_STATION:
 620                 case NL80211_IFTYPE_ADHOC:
 621                 case NL80211_IFTYPE_AP:
 622                 case NL80211_IFTYPE_MESH_POINT:
 623                         netif_carrier_off(dev);
 624                         break;
 625                 case NL80211_IFTYPE_WDS:
 626                 case NL80211_IFTYPE_P2P_DEVICE:
 627                         break;
 628                 default:
 629                         /* not reached */
 630                         WARN_ON(1);
 631                 }
 632
 633                 /*
 634                  * set default queue parameters so drivers don't
 635                  * need to initialise the hardware if the hardware
 636                  * doesn't start up with sane defaults
 637                  */
 638                 ieee80211_set_wmm_default(sdata, true);
 639         }
 640
 641         set_bit(SDATA_STATE_RUNNING, &sdata->state);
 642
 643         if (sdata->vif.type == NL80211_IFTYPE_WDS) {
 644                 /* Create STA entry for the WDS peer */
 645                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
 646                                      GFP_KERNEL);
 647                 if (!sta) {
 648                         res = -ENOMEM;
 649                         goto err_del_interface;
 650                 }
 651
 652                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
 653                 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
 654                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
 655
 656                 res = sta_info_insert(sta);
 657                 if (res) {
 658                         /* STA has been freed */
 659                         goto err_del_interface;
 660                 }
 661
 662                 rate_control_rate_init(sta);
 663                 netif_carrier_on(dev);
 664         } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
 665                 rcu_assign_pointer(local->p2p_sdata, sdata);
 666         }
 667
 668         /*
 669          * set_multicast_list will be invoked by the networking core
 670          * which will check whether any increments here were done in
 671          * error and sync them down to the hardware as filter flags.
 672          */
 673         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 674                 atomic_inc(&local->iff_allmultis);
 675
 676         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 677                 atomic_inc(&local->iff_promiscs);
 678
 679         if (coming_up)
 680                 local->open_count++;
 681
 682         if (hw_reconf_flags)
 683                 ieee80211_hw_config(local, hw_reconf_flags);
 684
 685         ieee80211_recalc_ps(local, -1);
 686
 687         if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
 688             sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 689                 /* XXX: for AP_VLAN, actually track AP queues */
 690                 netif_tx_start_all_queues(dev);
 691         } else if (dev) {
 692                 unsigned long flags;
 693                 int n_acs = IEEE80211_NUM_ACS;
 694                 int ac;
 695
 696                 if (local->hw.queues < IEEE80211_NUM_ACS)
 697                         n_acs = 1;
 698
 699                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 700                 if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE ||
 701                     (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 &&
 702                      skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) {
 703                         for (ac = 0; ac < n_acs; ac++) {
 704                                 int ac_queue = sdata->vif.hw_queue[ac];
 705
 706                                 if (local->queue_stop_reasons[ac_queue] == 0 &&
 707                                     skb_queue_empty(&local->pending[ac_queue]))
 708                                         netif_start_subqueue(dev, ac);
 709                         }
 710                 }
 711                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 712         }
 713
 714         return 0;
 715  err_del_interface:
 716         drv_remove_interface(local, sdata);
 717  err_stop:
 718         if (!local->open_count)
 719                 drv_stop(local);
 720  err_del_bss:
 721         sdata->bss = NULL;
 722         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
 723                 list_del(&sdata->u.vlan.list);
 724         /* might already be clear but that doesn't matter */
 725         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 726         return res;
 727 }
 728
 729 static int ieee80211_open(struct net_device *dev)
 730 {
 731         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 732         int err;
 733
 734         /* fail early if user set an invalid address */
 735         if (!is_valid_ether_addr(dev->dev_addr))
 736                 return -EADDRNOTAVAIL;
 737
 738         err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
 739         if (err)
 740                 return err;
 741
 742         return ieee80211_do_open(&sdata->wdev, true);
 743 }
 744
 745 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
 746                               bool going_down)
 747 {
 748         struct ieee80211_local *local = sdata->local;
 749         unsigned long flags;
 750         struct sk_buff *skb, *tmp;
 751         u32 hw_reconf_flags = 0;
 752         int i, flushed;
 753         struct ps_data *ps;
 754         struct cfg80211_chan_def chandef;
 755
 756         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 757
 758         if (rcu_access_pointer(local->scan_sdata) == sdata)
 759                 ieee80211_scan_cancel(local);
 760
 761         /*
 762          * Stop TX on this interface first.
 763          */
 764         if (sdata->dev)
 765                 netif_tx_stop_all_queues(sdata->dev);
 766
 767         ieee80211_roc_purge(local, sdata);
 768
 769         if (sdata->vif.type == NL80211_IFTYPE_STATION)
 770                 ieee80211_mgd_stop(sdata);
 771
 772         if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
 773                 ieee80211_ibss_stop(sdata);
 774
 775
 776         /*
 777          * Remove all stations associated with this interface.
 778          *
 779          * This must be done before calling ops->remove_interface()
 780          * because otherwise we can later invoke ops->sta_notify()
 781          * whenever the STAs are removed, and that invalidates driver
 782          * assumptions about always getting a vif pointer that is valid
 783          * (because if we remove a STA after ops->remove_interface()
 784          * the driver will have removed the vif info already!)
 785          *
 786          * This is relevant only in WDS mode, in all other modes we've
 787          * already removed all stations when disconnecting or similar,
 788          * so warn otherwise.
 789          */
 790         flushed = sta_info_flush(sdata);
 791         WARN_ON_ONCE((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) ||
 792                      (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1));
 793
 794         /* don't count this interface for promisc/allmulti while it is down */
 795         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 796                 atomic_dec(&local->iff_allmultis);
 797
 798         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 799                 atomic_dec(&local->iff_promiscs);
 800
 801         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 802                 local->fif_pspoll--;
 803                 local->fif_probe_req--;
 804         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 805                 local->fif_probe_req--;
 806         }
 807
 808         if (sdata->dev) {
 809                 netif_addr_lock_bh(sdata->dev);
 810                 spin_lock_bh(&local->filter_lock);
 811                 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
 812                                  sdata->dev->addr_len);
 813                 spin_unlock_bh(&local->filter_lock);
 814                 netif_addr_unlock_bh(sdata->dev);
 815         }
 816
 817         del_timer_sync(&local->dynamic_ps_timer);
 818         cancel_work_sync(&local->dynamic_ps_enable_work);
 819
 820         cancel_work_sync(&sdata->recalc_smps);
 821         sdata->vif.csa_active = false;
 822         cancel_work_sync(&sdata->csa_finalize_work);
 823
 824         cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
 825
 826         if (sdata->wdev.cac_started) {
 827                 chandef = sdata->vif.bss_conf.chandef;
 828                 WARN_ON(local->suspended);
 829                 ieee80211_vif_release_channel(sdata);
 830                 cfg80211_cac_event(sdata->dev, &chandef,
 831                                    NL80211_RADAR_CAC_ABORTED,
 832                                    GFP_KERNEL);
 833         }
 834
 835         /* APs need special treatment */
 836         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 837                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
 838
 839                 /* down all dependent devices, that is VLANs */
 840                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
 841                                          u.vlan.list)
 842                         dev_close(vlan->dev);
 843                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
 844         } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 845                 /* remove all packets in parent bc_buf pointing to this dev */
 846                 ps = &sdata->bss->ps;
 847
 848                 spin_lock_irqsave(&ps->bc_buf.lock, flags);
 849                 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
 850                         if (skb->dev == sdata->dev) {
 851                                 __skb_unlink(skb, &ps->bc_buf);
 852                                 local->total_ps_buffered--;
 853                                 ieee80211_free_txskb(&local->hw, skb);
 854                         }
 855                 }
 856                 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
 857         }
 858
 859         if (going_down)
 860                 local->open_count--;
 861
 862         switch (sdata->vif.type) {
 863         case NL80211_IFTYPE_AP_VLAN:
 864                 list_del(&sdata->u.vlan.list);
 865                 rcu_assign_pointer(sdata->vif.chanctx_conf, NULL);
 866                 /* no need to tell driver */
 867                 break;
 868         case NL80211_IFTYPE_MONITOR:
 869                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 870                         local->cooked_mntrs--;
 871                         break;
 872                 }
 873
 874                 local->monitors--;
 875                 if (local->monitors == 0) {
 876                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
 877                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 878                 }
 879
 880                 ieee80211_adjust_monitor_flags(sdata, -1);
 881                 break;
 882         case NL80211_IFTYPE_P2P_DEVICE:
 883                 /* relies on synchronize_rcu() below */
 884                 rcu_assign_pointer(local->p2p_sdata, NULL);
 885                 /* fall through */
 886         default:
 887                 cancel_work_sync(&sdata->work);
 888                 /*
 889                  * When we get here, the interface is marked down.
 890                  * Free the remaining keys, if there are any
 891                  * (shouldn't be, except maybe in WDS mode?)
 892                  *
 893                  * Force the key freeing to always synchronize_net()
 894                  * to wait for the RX path in case it is using this
 895                  * interface enqueuing frames * at this very time on
 896                  * another CPU.
 897                  */
 898                 ieee80211_free_keys(sdata, true);
 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         spin_lock_bh(&local->filter_lock);
1010         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
1011         spin_unlock_bh(&local->filter_lock);
1012         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
1013 }
1014
1015 /*
1016  * Called when the netdev is removed or, by the code below, before
1017  * the interface type changes.
1018  */
1019 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
1020 {
1021         int i;
1022
1023         /* free extra data */
1024         ieee80211_free_keys(sdata, false);
1025
1026         ieee80211_debugfs_remove_netdev(sdata);
1027
1028         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1029                 __skb_queue_purge(&sdata->fragments[i].skb_list);
1030         sdata->fragment_next = 0;
1031
1032         if (ieee80211_vif_is_mesh(&sdata->vif))
1033                 mesh_rmc_free(sdata);
1034 }
1035
1036 static void ieee80211_uninit(struct net_device *dev)
1037 {
1038         ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
1039 }
1040
1041 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
1042                                          struct sk_buff *skb)
1043 {
1044         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
1045 }
1046
1047 static const struct net_device_ops ieee80211_dataif_ops = {
1048         .ndo_open               = ieee80211_open,
1049         .ndo_stop               = ieee80211_stop,
1050         .ndo_uninit             = ieee80211_uninit,
1051         .ndo_start_xmit         = ieee80211_subif_start_xmit,
1052         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1053         .ndo_change_mtu         = ieee80211_change_mtu,
1054         .ndo_set_mac_address    = ieee80211_change_mac,
1055         .ndo_select_queue       = ieee80211_netdev_select_queue,
1056 };
1057
1058 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
1059                                           struct sk_buff *skb)
1060 {
1061         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1062         struct ieee80211_local *local = sdata->local;
1063         struct ieee80211_hdr *hdr;
1064         struct ieee80211_radiotap_header *rtap = (void *)skb->data;
1065
1066         if (local->hw.queues < IEEE80211_NUM_ACS)
1067                 return 0;
1068
1069         if (skb->len < 4 ||
1070             skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
1071                 return 0; /* doesn't matter, frame will be dropped */
1072
1073         hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
1074
1075         return ieee80211_select_queue_80211(sdata, skb, hdr);
1076 }
1077
1078 static const struct net_device_ops ieee80211_monitorif_ops = {
1079         .ndo_open               = ieee80211_open,
1080         .ndo_stop               = ieee80211_stop,
1081         .ndo_uninit             = ieee80211_uninit,
1082         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
1083         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1084         .ndo_change_mtu         = ieee80211_change_mtu,
1085         .ndo_set_mac_address    = ieee80211_change_mac,
1086         .ndo_select_queue       = ieee80211_monitor_select_queue,
1087 };
1088
1089 static void ieee80211_if_setup(struct net_device *dev)
1090 {
1091         ether_setup(dev);
1092         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1093         dev->netdev_ops = &ieee80211_dataif_ops;
1094         dev->destructor = free_netdev;
1095 }
1096
1097 static void ieee80211_iface_work(struct work_struct *work)
1098 {
1099         struct ieee80211_sub_if_data *sdata =
1100                 container_of(work, struct ieee80211_sub_if_data, work);
1101         struct ieee80211_local *local = sdata->local;
1102         struct sk_buff *skb;
1103         struct sta_info *sta;
1104         struct ieee80211_ra_tid *ra_tid;
1105
1106         if (!ieee80211_sdata_running(sdata))
1107                 return;
1108
1109         if (local->scanning)
1110                 return;
1111
1112         /*
1113          * ieee80211_queue_work() should have picked up most cases,
1114          * here we'll pick the rest.
1115          */
1116         if (WARN(local->suspended,
1117                  "interface work scheduled while going to suspend\n"))
1118                 return;
1119
1120         /* first process frames */
1121         while ((skb = skb_dequeue(&sdata->skb_queue))) {
1122                 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1123
1124                 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
1125                         ra_tid = (void *)&skb->cb;
1126                         ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
1127                                                  ra_tid->tid);
1128                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
1129                         ra_tid = (void *)&skb->cb;
1130                         ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
1131                                                 ra_tid->tid);
1132                 } else if (ieee80211_is_action(mgmt->frame_control) &&
1133                            mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1134                         int len = skb->len;
1135
1136                         mutex_lock(&local->sta_mtx);
1137                         sta = sta_info_get_bss(sdata, mgmt->sa);
1138                         if (sta) {
1139                                 switch (mgmt->u.action.u.addba_req.action_code) {
1140                                 case WLAN_ACTION_ADDBA_REQ:
1141                                         ieee80211_process_addba_request(
1142                                                         local, sta, mgmt, len);
1143                                         break;
1144                                 case WLAN_ACTION_ADDBA_RESP:
1145                                         ieee80211_process_addba_resp(local, sta,
1146                                                                      mgmt, len);
1147                                         break;
1148                                 case WLAN_ACTION_DELBA:
1149                                         ieee80211_process_delba(sdata, sta,
1150                                                                 mgmt, len);
1151                                         break;
1152                                 default:
1153                                         WARN_ON(1);
1154                                         break;
1155                                 }
1156                         }
1157                         mutex_unlock(&local->sta_mtx);
1158                 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1159                         struct ieee80211_hdr *hdr = (void *)mgmt;
1160                         /*
1161                          * So the frame isn't mgmt, but frame_control
1162                          * is at the right place anyway, of course, so
1163                          * the if statement is correct.
1164                          *
1165                          * Warn if we have other data frame types here,
1166                          * they must not get here.
1167                          */
1168                         WARN_ON(hdr->frame_control &
1169                                         cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1170                         WARN_ON(!(hdr->seq_ctrl &
1171                                         cpu_to_le16(IEEE80211_SCTL_FRAG)));
1172                         /*
1173                          * This was a fragment of a frame, received while
1174                          * a block-ack session was active. That cannot be
1175                          * right, so terminate the session.
1176                          */
1177                         mutex_lock(&local->sta_mtx);
1178                         sta = sta_info_get_bss(sdata, mgmt->sa);
1179                         if (sta) {
1180                                 u16 tid = *ieee80211_get_qos_ctl(hdr) &
1181                                                 IEEE80211_QOS_CTL_TID_MASK;
1182
1183                                 __ieee80211_stop_rx_ba_session(
1184                                         sta, tid, WLAN_BACK_RECIPIENT,
1185                                         WLAN_REASON_QSTA_REQUIRE_SETUP,
1186                                         true);
1187                         }
1188                         mutex_unlock(&local->sta_mtx);
1189                 } else switch (sdata->vif.type) {
1190                 case NL80211_IFTYPE_STATION:
1191                         ieee80211_sta_rx_queued_mgmt(sdata, skb);
1192                         break;
1193                 case NL80211_IFTYPE_ADHOC:
1194                         ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1195                         break;
1196                 case NL80211_IFTYPE_MESH_POINT:
1197                         if (!ieee80211_vif_is_mesh(&sdata->vif))
1198                                 break;
1199                         ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1200                         break;
1201                 default:
1202                         WARN(1, "frame for unexpected interface type");
1203                         break;
1204                 }
1205
1206                 kfree_skb(skb);
1207         }
1208
1209         /* then other type-dependent work */
1210         switch (sdata->vif.type) {
1211         case NL80211_IFTYPE_STATION:
1212                 ieee80211_sta_work(sdata);
1213                 break;
1214         case NL80211_IFTYPE_ADHOC:
1215                 ieee80211_ibss_work(sdata);
1216                 break;
1217         case NL80211_IFTYPE_MESH_POINT:
1218                 if (!ieee80211_vif_is_mesh(&sdata->vif))
1219                         break;
1220                 ieee80211_mesh_work(sdata);
1221                 break;
1222         default:
1223                 break;
1224         }
1225 }
1226
1227 static void ieee80211_recalc_smps_work(struct work_struct *work)
1228 {
1229         struct ieee80211_sub_if_data *sdata =
1230                 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1231
1232         ieee80211_recalc_smps(sdata);
1233 }
1234
1235 /*
1236  * Helper function to initialise an interface to a specific type.
1237  */
1238 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1239                                   enum nl80211_iftype type)
1240 {
1241         /* clear type-dependent union */
1242         memset(&sdata->u, 0, sizeof(sdata->u));
1243
1244         /* and set some type-dependent values */
1245         sdata->vif.type = type;
1246         sdata->vif.p2p = false;
1247         sdata->wdev.iftype = type;
1248
1249         sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1250         sdata->control_port_no_encrypt = false;
1251         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1252
1253         sdata->noack_map = 0;
1254
1255         /* only monitor/p2p-device differ */
1256         if (sdata->dev) {
1257                 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1258                 sdata->dev->type = ARPHRD_ETHER;
1259         }
1260
1261         skb_queue_head_init(&sdata->skb_queue);
1262         INIT_WORK(&sdata->work, ieee80211_iface_work);
1263         INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1264         INIT_WORK(&sdata->csa_finalize_work, ieee80211_csa_finalize_work);
1265
1266         switch (type) {
1267         case NL80211_IFTYPE_P2P_GO:
1268                 type = NL80211_IFTYPE_AP;
1269                 sdata->vif.type = type;
1270                 sdata->vif.p2p = true;
1271                 /* fall through */
1272         case NL80211_IFTYPE_AP:
1273                 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1274                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1275                 INIT_WORK(&sdata->u.ap.request_smps_work,
1276                           ieee80211_request_smps_ap_work);
1277                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1278                 sdata->u.ap.req_smps = IEEE80211_SMPS_OFF;
1279                 break;
1280         case NL80211_IFTYPE_P2P_CLIENT:
1281                 type = NL80211_IFTYPE_STATION;
1282                 sdata->vif.type = type;
1283                 sdata->vif.p2p = true;
1284                 /* fall through */
1285         case NL80211_IFTYPE_STATION:
1286                 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1287                 ieee80211_sta_setup_sdata(sdata);
1288                 break;
1289         case NL80211_IFTYPE_ADHOC:
1290                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1291                 ieee80211_ibss_setup_sdata(sdata);
1292                 break;
1293         case NL80211_IFTYPE_MESH_POINT:
1294                 if (ieee80211_vif_is_mesh(&sdata->vif))
1295                         ieee80211_mesh_init_sdata(sdata);
1296                 break;
1297         case NL80211_IFTYPE_MONITOR:
1298                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1299                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1300                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
1301                                       MONITOR_FLAG_OTHER_BSS;
1302                 break;
1303         case NL80211_IFTYPE_WDS:
1304                 sdata->vif.bss_conf.bssid = NULL;
1305                 break;
1306         case NL80211_IFTYPE_AP_VLAN:
1307         case NL80211_IFTYPE_P2P_DEVICE:
1308                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1309                 break;
1310         case NL80211_IFTYPE_UNSPECIFIED:
1311         case NUM_NL80211_IFTYPES:
1312                 BUG();
1313                 break;
1314         }
1315
1316         ieee80211_debugfs_add_netdev(sdata);
1317 }
1318
1319 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1320                                            enum nl80211_iftype type)
1321 {
1322         struct ieee80211_local *local = sdata->local;
1323         int ret, err;
1324         enum nl80211_iftype internal_type = type;
1325         bool p2p = false;
1326
1327         ASSERT_RTNL();
1328
1329         if (!local->ops->change_interface)
1330                 return -EBUSY;
1331
1332         switch (sdata->vif.type) {
1333         case NL80211_IFTYPE_AP:
1334         case NL80211_IFTYPE_STATION:
1335         case NL80211_IFTYPE_ADHOC:
1336                 /*
1337                  * Could maybe also all others here?
1338                  * Just not sure how that interacts
1339                  * with the RX/config path e.g. for
1340                  * mesh.
1341                  */
1342                 break;
1343         default:
1344                 return -EBUSY;
1345         }
1346
1347         switch (type) {
1348         case NL80211_IFTYPE_AP:
1349         case NL80211_IFTYPE_STATION:
1350         case NL80211_IFTYPE_ADHOC:
1351                 /*
1352                  * Could probably support everything
1353                  * but WDS here (WDS do_open can fail
1354                  * under memory pressure, which this
1355                  * code isn't prepared to handle).
1356                  */
1357                 break;
1358         case NL80211_IFTYPE_P2P_CLIENT:
1359                 p2p = true;
1360                 internal_type = NL80211_IFTYPE_STATION;
1361                 break;
1362         case NL80211_IFTYPE_P2P_GO:
1363                 p2p = true;
1364                 internal_type = NL80211_IFTYPE_AP;
1365                 break;
1366         default:
1367                 return -EBUSY;
1368         }
1369
1370         ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1371         if (ret)
1372                 return ret;
1373
1374         ieee80211_do_stop(sdata, false);
1375
1376         ieee80211_teardown_sdata(sdata);
1377
1378         ret = drv_change_interface(local, sdata, internal_type, p2p);
1379         if (ret)
1380                 type = ieee80211_vif_type_p2p(&sdata->vif);
1381
1382         /*
1383          * Ignore return value here, there's not much we can do since
1384          * the driver changed the interface type internally already.
1385          * The warnings will hopefully make driver authors fix it :-)
1386          */
1387         ieee80211_check_queues(sdata, type);
1388
1389         ieee80211_setup_sdata(sdata, type);
1390
1391         err = ieee80211_do_open(&sdata->wdev, false);
1392         WARN(err, "type change: do_open returned %d", err);
1393
1394         return ret;
1395 }
1396
1397 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1398                              enum nl80211_iftype type)
1399 {
1400         int ret;
1401
1402         ASSERT_RTNL();
1403
1404         if (type == ieee80211_vif_type_p2p(&sdata->vif))
1405                 return 0;
1406
1407         if (ieee80211_sdata_running(sdata)) {
1408                 ret = ieee80211_runtime_change_iftype(sdata, type);
1409                 if (ret)
1410                         return ret;
1411         } else {
1412                 /* Purge and reset type-dependent state. */
1413                 ieee80211_teardown_sdata(sdata);
1414                 ieee80211_setup_sdata(sdata, type);
1415         }
1416
1417         /* reset some values that shouldn't be kept across type changes */
1418         sdata->drop_unencrypted = 0;
1419         if (type == NL80211_IFTYPE_STATION)
1420                 sdata->u.mgd.use_4addr = false;
1421
1422         return 0;
1423 }
1424
1425 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1426                                        u8 *perm_addr, enum nl80211_iftype type)
1427 {
1428         struct ieee80211_sub_if_data *sdata;
1429         u64 mask, start, addr, val, inc;
1430         u8 *m;
1431         u8 tmp_addr[ETH_ALEN];
1432         int i;
1433
1434         /* default ... something at least */
1435         memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1436
1437         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1438             local->hw.wiphy->n_addresses <= 1)
1439                 return;
1440
1441         mutex_lock(&local->iflist_mtx);
1442
1443         switch (type) {
1444         case NL80211_IFTYPE_MONITOR:
1445                 /* doesn't matter */
1446                 break;
1447         case NL80211_IFTYPE_WDS:
1448         case NL80211_IFTYPE_AP_VLAN:
1449                 /* match up with an AP interface */
1450                 list_for_each_entry(sdata, &local->interfaces, list) {
1451                         if (sdata->vif.type != NL80211_IFTYPE_AP)
1452                                 continue;
1453                         memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1454                         break;
1455                 }
1456                 /* keep default if no AP interface present */
1457                 break;
1458         case NL80211_IFTYPE_P2P_CLIENT:
1459         case NL80211_IFTYPE_P2P_GO:
1460                 if (local->hw.flags & IEEE80211_HW_P2P_DEV_ADDR_FOR_INTF) {
1461                         list_for_each_entry(sdata, &local->interfaces, list) {
1462                                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1463                                         continue;
1464                                 if (!ieee80211_sdata_running(sdata))
1465                                         continue;
1466                                 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1467                                 goto out_unlock;
1468                         }
1469                 }
1470                 /* otherwise fall through */
1471         default:
1472                 /* assign a new address if possible -- try n_addresses first */
1473                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1474                         bool used = false;
1475
1476                         list_for_each_entry(sdata, &local->interfaces, list) {
1477                                 if (memcmp(local->hw.wiphy->addresses[i].addr,
1478                                            sdata->vif.addr, ETH_ALEN) == 0) {
1479                                         used = true;
1480                                         break;
1481                                 }
1482                         }
1483
1484                         if (!used) {
1485                                 memcpy(perm_addr,
1486                                        local->hw.wiphy->addresses[i].addr,
1487                                        ETH_ALEN);
1488                                 break;
1489                         }
1490                 }
1491
1492                 /* try mask if available */
1493                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1494                         break;
1495
1496                 m = local->hw.wiphy->addr_mask;
1497                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1498                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1499                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1500
1501                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1502                         /* not a contiguous mask ... not handled now! */
1503                         pr_info("not contiguous\n");
1504                         break;
1505                 }
1506
1507                 /*
1508                  * Pick address of existing interface in case user changed
1509                  * MAC address manually, default to perm_addr.
1510                  */
1511                 m = local->hw.wiphy->perm_addr;
1512                 list_for_each_entry(sdata, &local->interfaces, list) {
1513                         if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
1514                                 continue;
1515                         m = sdata->vif.addr;
1516                         break;
1517                 }
1518                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1519                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1520                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1521
1522                 inc = 1ULL<<__ffs64(mask);
1523                 val = (start & mask);
1524                 addr = (start & ~mask) | (val & mask);
1525                 do {
1526                         bool used = false;
1527
1528                         tmp_addr[5] = addr >> 0*8;
1529                         tmp_addr[4] = addr >> 1*8;
1530                         tmp_addr[3] = addr >> 2*8;
1531                         tmp_addr[2] = addr >> 3*8;
1532                         tmp_addr[1] = addr >> 4*8;
1533                         tmp_addr[0] = addr >> 5*8;
1534
1535                         val += inc;
1536
1537                         list_for_each_entry(sdata, &local->interfaces, list) {
1538                                 if (memcmp(tmp_addr, sdata->vif.addr,
1539                                                         ETH_ALEN) == 0) {
1540                                         used = true;
1541                                         break;
1542                                 }
1543                         }
1544
1545                         if (!used) {
1546                                 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1547                                 break;
1548                         }
1549                         addr = (start & ~mask) | (val & mask);
1550                 } while (addr != start);
1551
1552                 break;
1553         }
1554
1555  out_unlock:
1556         mutex_unlock(&local->iflist_mtx);
1557 }
1558
1559 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1560                      struct wireless_dev **new_wdev, enum nl80211_iftype type,
1561                      struct vif_params *params)
1562 {
1563         struct net_device *ndev = NULL;
1564         struct ieee80211_sub_if_data *sdata = NULL;
1565         int ret, i;
1566         int txqs = 1;
1567
1568         ASSERT_RTNL();
1569
1570         if (type == NL80211_IFTYPE_P2P_DEVICE) {
1571                 struct wireless_dev *wdev;
1572
1573                 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1574                                 GFP_KERNEL);
1575                 if (!sdata)
1576                         return -ENOMEM;
1577                 wdev = &sdata->wdev;
1578
1579                 sdata->dev = NULL;
1580                 strlcpy(sdata->name, name, IFNAMSIZ);
1581                 ieee80211_assign_perm_addr(local, wdev->address, type);
1582                 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1583         } else {
1584                 if (local->hw.queues >= IEEE80211_NUM_ACS)
1585                         txqs = IEEE80211_NUM_ACS;
1586
1587                 ndev = alloc_netdev_mqs(sizeof(*sdata) +
1588                                         local->hw.vif_data_size,
1589                                         name, ieee80211_if_setup, txqs, 1);
1590                 if (!ndev)
1591                         return -ENOMEM;
1592                 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1593
1594                 ndev->needed_headroom = local->tx_headroom +
1595                                         4*6 /* four MAC addresses */
1596                                         + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1597                                         + 6 /* mesh */
1598                                         + 8 /* rfc1042/bridge tunnel */
1599                                         - ETH_HLEN /* ethernet hard_header_len */
1600                                         + IEEE80211_ENCRYPT_HEADROOM;
1601                 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1602
1603                 ret = dev_alloc_name(ndev, ndev->name);
1604                 if (ret < 0) {
1605                         free_netdev(ndev);
1606                         return ret;
1607                 }
1608
1609                 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1610                 memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1611                 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1612
1613                 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1614                 sdata = netdev_priv(ndev);
1615                 ndev->ieee80211_ptr = &sdata->wdev;
1616                 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1617                 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1618
1619                 sdata->dev = ndev;
1620         }
1621
1622         /* initialise type-independent data */
1623         sdata->wdev.wiphy = local->hw.wiphy;
1624         sdata->local = local;
1625
1626         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1627                 skb_queue_head_init(&sdata->fragments[i].skb_list);
1628
1629         INIT_LIST_HEAD(&sdata->key_list);
1630
1631         INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
1632                           ieee80211_dfs_cac_timer_work);
1633         INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
1634                           ieee80211_delayed_tailroom_dec);
1635
1636         for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1637                 struct ieee80211_supported_band *sband;
1638                 sband = local->hw.wiphy->bands[i];
1639                 sdata->rc_rateidx_mask[i] =
1640                         sband ? (1 << sband->n_bitrates) - 1 : 0;
1641                 if (sband)
1642                         memcpy(sdata->rc_rateidx_mcs_mask[i],
1643                                sband->ht_cap.mcs.rx_mask,
1644                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1645                 else
1646                         memset(sdata->rc_rateidx_mcs_mask[i], 0,
1647                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1648         }
1649
1650         ieee80211_set_default_queues(sdata);
1651
1652         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1653         sdata->user_power_level = local->user_power_level;
1654
1655         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1656
1657         /* setup type-dependent data */
1658         ieee80211_setup_sdata(sdata, type);
1659
1660         if (ndev) {
1661                 if (params) {
1662                         ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1663                         if (type == NL80211_IFTYPE_STATION)
1664                                 sdata->u.mgd.use_4addr = params->use_4addr;
1665                 }
1666
1667                 ndev->features |= local->hw.netdev_features;
1668
1669                 ret = register_netdevice(ndev);
1670                 if (ret) {
1671                         free_netdev(ndev);
1672                         return ret;
1673                 }
1674         }
1675
1676         mutex_lock(&local->iflist_mtx);
1677         list_add_tail_rcu(&sdata->list, &local->interfaces);
1678         mutex_unlock(&local->iflist_mtx);
1679
1680         if (new_wdev)
1681                 *new_wdev = &sdata->wdev;
1682
1683         return 0;
1684 }
1685
1686 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1687 {
1688         ASSERT_RTNL();
1689
1690         mutex_lock(&sdata->local->iflist_mtx);
1691         list_del_rcu(&sdata->list);
1692         mutex_unlock(&sdata->local->iflist_mtx);
1693
1694         synchronize_rcu();
1695
1696         if (sdata->dev) {
1697                 unregister_netdevice(sdata->dev);
1698         } else {
1699                 cfg80211_unregister_wdev(&sdata->wdev);
1700                 kfree(sdata);
1701         }
1702 }
1703
1704 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
1705 {
1706         if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
1707                 return;
1708         ieee80211_do_stop(sdata, true);
1709         ieee80211_teardown_sdata(sdata);
1710 }
1711
1712 /*
1713  * Remove all interfaces, may only be called at hardware unregistration
1714  * time because it doesn't do RCU-safe list removals.
1715  */
1716 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1717 {
1718         struct ieee80211_sub_if_data *sdata, *tmp;
1719         LIST_HEAD(unreg_list);
1720         LIST_HEAD(wdev_list);
1721
1722         ASSERT_RTNL();
1723
1724         /*
1725          * Close all AP_VLAN interfaces first, as otherwise they
1726          * might be closed while the AP interface they belong to
1727          * is closed, causing unregister_netdevice_many() to crash.
1728          */
1729         list_for_each_entry(sdata, &local->interfaces, list)
1730                 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1731                         dev_close(sdata->dev);
1732
1733         mutex_lock(&local->iflist_mtx);
1734         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1735                 list_del(&sdata->list);
1736
1737                 if (sdata->dev)
1738                         unregister_netdevice_queue(sdata->dev, &unreg_list);
1739                 else
1740                         list_add(&sdata->list, &wdev_list);
1741         }
1742         mutex_unlock(&local->iflist_mtx);
1743         unregister_netdevice_many(&unreg_list);
1744         list_del(&unreg_list);
1745
1746         list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
1747                 list_del(&sdata->list);
1748                 cfg80211_unregister_wdev(&sdata->wdev);
1749                 kfree(sdata);
1750         }
1751 }
1752
1753 static int netdev_notify(struct notifier_block *nb,
1754                          unsigned long state, void *ptr)
1755 {
1756         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1757         struct ieee80211_sub_if_data *sdata;
1758
1759         if (state != NETDEV_CHANGENAME)
1760                 return 0;
1761
1762         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1763                 return 0;
1764
1765         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1766                 return 0;
1767
1768         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1769
1770         memcpy(sdata->name, dev->name, IFNAMSIZ);
1771
1772         ieee80211_debugfs_rename_netdev(sdata);
1773         return 0;
1774 }
1775
1776 static struct notifier_block mac80211_netdev_notifier = {
1777         .notifier_call = netdev_notify,
1778 };
1779
1780 int ieee80211_iface_init(void)
1781 {
1782         return register_netdevice_notifier(&mac80211_netdev_notifier);
1783 }
1784
1785 void ieee80211_iface_exit(void)
1786 {
1787         unregister_netdevice_notifier(&mac80211_netdev_notifier);
1788 }