net/mac80211/iface.c

   1 /*
   2  * Interface handling (except master interface)
   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
  28 /**
  29  * DOC: Interface list locking
  30  *
  31  * The interface list in each struct ieee80211_local is protected
  32  * three-fold:
  33  *
  34  * (1) modifications may only be done under the RTNL
  35  * (2) modifications and readers are protected against each other by
  36  *     the iflist_mtx.
  37  * (3) modifications are done in an RCU manner so atomic readers
  38  *     can traverse the list in RCU-safe blocks.
  39  *
  40  * As a consequence, reads (traversals) of the list can be protected
  41  * by either the RTNL, the iflist_mtx or RCU.
  42  */
  43
  44
  45 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
  46 {
  47         int meshhdrlen;
  48         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
  49
  50         meshhdrlen = (sdata->vif.type == NL80211_IFTYPE_MESH_POINT) ? 5 : 0;
  51
  52         /* FIX: what would be proper limits for MTU?
  53          * This interface uses 802.3 frames. */
  54         if (new_mtu < 256 ||
  55             new_mtu > IEEE80211_MAX_DATA_LEN - 24 - 6 - meshhdrlen) {
  56                 return -EINVAL;
  57         }
  58
  59 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
  60         printk(KERN_DEBUG "%s: setting MTU %d\n", dev->name, new_mtu);
  61 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
  62         dev->mtu = new_mtu;
  63         return 0;
  64 }
  65
  66 static int ieee80211_change_mac(struct net_device *dev, void *addr)
  67 {
  68         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
  69         struct sockaddr *sa = addr;
  70         int ret;
  71
  72         if (ieee80211_sdata_running(sdata))
  73                 return -EBUSY;
  74
  75         ret = eth_mac_addr(dev, sa);
  76
  77         if (ret == 0)
  78                 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
  79
  80         return ret;
  81 }
  82
  83 static inline int identical_mac_addr_allowed(int type1, int type2)
  84 {
  85         return type1 == NL80211_IFTYPE_MONITOR ||
  86                 type2 == NL80211_IFTYPE_MONITOR ||
  87                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
  88                 (type1 == NL80211_IFTYPE_WDS &&
  89                         (type2 == NL80211_IFTYPE_WDS ||
  90                          type2 == NL80211_IFTYPE_AP)) ||
  91                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
  92                 (type1 == NL80211_IFTYPE_AP_VLAN &&
  93                         (type2 == NL80211_IFTYPE_AP ||
  94                          type2 == NL80211_IFTYPE_AP_VLAN));
  95 }
  96
  97 static int ieee80211_open(struct net_device *dev)
  98 {
  99         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 100         struct ieee80211_sub_if_data *nsdata;
 101         struct ieee80211_local *local = sdata->local;
 102         struct sta_info *sta;
 103         u32 changed = 0;
 104         int res;
 105         u32 hw_reconf_flags = 0;
 106         u8 null_addr[ETH_ALEN] = {0};
 107
 108         /* fail early if user set an invalid address */
 109         if (compare_ether_addr(dev->dev_addr, null_addr) &&
 110             !is_valid_ether_addr(dev->dev_addr))
 111                 return -EADDRNOTAVAIL;
 112
 113         /* we hold the RTNL here so can safely walk the list */
 114         list_for_each_entry(nsdata, &local->interfaces, list) {
 115                 struct net_device *ndev = nsdata->dev;
 116
 117                 if (ndev != dev && ieee80211_sdata_running(nsdata)) {
 118                         /*
 119                          * Allow only a single IBSS interface to be up at any
 120                          * time. This is restricted because beacon distribution
 121                          * cannot work properly if both are in the same IBSS.
 122                          *
 123                          * To remove this restriction we'd have to disallow them
 124                          * from setting the same SSID on different IBSS interfaces
 125                          * belonging to the same hardware. Then, however, we're
 126                          * faced with having to adopt two different TSF timers...
 127                          */
 128                         if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
 129                             nsdata->vif.type == NL80211_IFTYPE_ADHOC)
 130                                 return -EBUSY;
 131
 132                         /*
 133                          * The remaining checks are only performed for interfaces
 134                          * with the same MAC address.
 135                          */
 136                         if (compare_ether_addr(dev->dev_addr, ndev->dev_addr))
 137                                 continue;
 138
 139                         /*
 140                          * check whether it may have the same address
 141                          */
 142                         if (!identical_mac_addr_allowed(sdata->vif.type,
 143                                                         nsdata->vif.type))
 144                                 return -ENOTUNIQ;
 145
 146                         /*
 147                          * can only add VLANs to enabled APs
 148                          */
 149                         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
 150                             nsdata->vif.type == NL80211_IFTYPE_AP)
 151                                 sdata->bss = &nsdata->u.ap;
 152                 }
 153         }
 154
 155         switch (sdata->vif.type) {
 156         case NL80211_IFTYPE_WDS:
 157                 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
 158                         return -ENOLINK;
 159                 break;
 160         case NL80211_IFTYPE_AP_VLAN:
 161                 if (!sdata->bss)
 162                         return -ENOLINK;
 163                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
 164                 break;
 165         case NL80211_IFTYPE_AP:
 166                 sdata->bss = &sdata->u.ap;
 167                 break;
 168         case NL80211_IFTYPE_MESH_POINT:
 169                 if (!ieee80211_vif_is_mesh(&sdata->vif))
 170                         break;
 171                 /* mesh ifaces must set allmulti to forward mcast traffic */
 172                 atomic_inc(&local->iff_allmultis);
 173                 break;
 174         case NL80211_IFTYPE_STATION:
 175         case NL80211_IFTYPE_MONITOR:
 176         case NL80211_IFTYPE_ADHOC:
 177                 /* no special treatment */
 178                 break;
 179         case NL80211_IFTYPE_UNSPECIFIED:
 180         case __NL80211_IFTYPE_AFTER_LAST:
 181                 /* cannot happen */
 182                 WARN_ON(1);
 183                 break;
 184         }
 185
 186         if (local->open_count == 0) {
 187                 res = drv_start(local);
 188                 if (res)
 189                         goto err_del_bss;
 190                 /* we're brought up, everything changes */
 191                 hw_reconf_flags = ~0;
 192                 ieee80211_led_radio(local, true);
 193         }
 194
 195         /*
 196          * Check all interfaces and copy the hopefully now-present
 197          * MAC address to those that have the special null one.
 198          */
 199         list_for_each_entry(nsdata, &local->interfaces, list) {
 200                 struct net_device *ndev = nsdata->dev;
 201
 202                 /*
 203                  * No need to check running since we do not allow
 204                  * it to start up with this invalid address.
 205                  */
 206                 if (compare_ether_addr(null_addr, ndev->dev_addr) == 0) {
 207                         memcpy(ndev->dev_addr,
 208                                local->hw.wiphy->perm_addr,
 209                                ETH_ALEN);
 210                         memcpy(ndev->perm_addr, ndev->dev_addr, ETH_ALEN);
 211                 }
 212         }
 213
 214         /*
 215          * Validate the MAC address for this device.
 216          */
 217         if (!is_valid_ether_addr(dev->dev_addr)) {
 218                 if (!local->open_count)
 219                         drv_stop(local);
 220                 return -EADDRNOTAVAIL;
 221         }
 222
 223         switch (sdata->vif.type) {
 224         case NL80211_IFTYPE_AP_VLAN:
 225                 /* no need to tell driver */
 226                 break;
 227         case NL80211_IFTYPE_MONITOR:
 228                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 229                         local->cooked_mntrs++;
 230                         break;
 231                 }
 232
 233                 /* must be before the call to ieee80211_configure_filter */
 234                 local->monitors++;
 235                 if (local->monitors == 1) {
 236                         local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
 237                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 238                 }
 239
 240                 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
 241                         local->fif_fcsfail++;
 242                 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
 243                         local->fif_plcpfail++;
 244                 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL) {
 245                         local->fif_control++;
 246                         local->fif_pspoll++;
 247                 }
 248                 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
 249                         local->fif_other_bss++;
 250
 251                 ieee80211_configure_filter(local);
 252
 253                 netif_carrier_on(dev);
 254                 break;
 255         default:
 256                 res = drv_add_interface(local, &sdata->vif);
 257                 if (res)
 258                         goto err_stop;
 259
 260                 if (ieee80211_vif_is_mesh(&sdata->vif)) {
 261                         local->fif_other_bss++;
 262                         ieee80211_configure_filter(local);
 263
 264                         ieee80211_start_mesh(sdata);
 265                 } else if (sdata->vif.type == NL80211_IFTYPE_AP) {
 266                         local->fif_pspoll++;
 267
 268                         ieee80211_configure_filter(local);
 269                 }
 270
 271                 changed |= ieee80211_reset_erp_info(sdata);
 272                 ieee80211_bss_info_change_notify(sdata, changed);
 273
 274                 if (sdata->vif.type == NL80211_IFTYPE_STATION)
 275                         netif_carrier_off(dev);
 276                 else
 277                         netif_carrier_on(dev);
 278         }
 279
 280         if (sdata->vif.type == NL80211_IFTYPE_WDS) {
 281                 /* Create STA entry for the WDS peer */
 282                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
 283                                      GFP_KERNEL);
 284                 if (!sta) {
 285                         res = -ENOMEM;
 286                         goto err_del_interface;
 287                 }
 288
 289                 /* no locking required since STA is not live yet */
 290                 sta->flags |= WLAN_STA_AUTHORIZED;
 291
 292                 res = sta_info_insert(sta);
 293                 if (res) {
 294                         /* STA has been freed */
 295                         goto err_del_interface;
 296                 }
 297         }
 298
 299         /*
 300          * set_multicast_list will be invoked by the networking core
 301          * which will check whether any increments here were done in
 302          * error and sync them down to the hardware as filter flags.
 303          */
 304         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 305                 atomic_inc(&local->iff_allmultis);
 306
 307         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 308                 atomic_inc(&local->iff_promiscs);
 309
 310         hw_reconf_flags |= __ieee80211_recalc_idle(local);
 311
 312         local->open_count++;
 313         if (hw_reconf_flags) {
 314                 ieee80211_hw_config(local, hw_reconf_flags);
 315                 /*
 316                  * set default queue parameters so drivers don't
 317                  * need to initialise the hardware if the hardware
 318                  * doesn't start up with sane defaults
 319                  */
 320                 ieee80211_set_wmm_default(sdata);
 321         }
 322
 323         ieee80211_recalc_ps(local, -1);
 324
 325         netif_tx_start_all_queues(dev);
 326
 327         return 0;
 328  err_del_interface:
 329         drv_remove_interface(local, &sdata->vif);
 330  err_stop:
 331         if (!local->open_count)
 332                 drv_stop(local);
 333  err_del_bss:
 334         sdata->bss = NULL;
 335         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
 336                 list_del(&sdata->u.vlan.list);
 337         return res;
 338 }
 339
 340 static int ieee80211_stop(struct net_device *dev)
 341 {
 342         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 343         struct ieee80211_local *local = sdata->local;
 344         unsigned long flags;
 345         struct sk_buff *skb, *tmp;
 346         u32 hw_reconf_flags = 0;
 347         int i;
 348
 349         /*
 350          * Stop TX on this interface first.
 351          */
 352         netif_tx_stop_all_queues(dev);
 353
 354         /*
 355          * Purge work for this interface.
 356          */
 357         ieee80211_work_purge(sdata);
 358
 359         /*
 360          * Remove all stations associated with this interface.
 361          *
 362          * This must be done before calling ops->remove_interface()
 363          * because otherwise we can later invoke ops->sta_notify()
 364          * whenever the STAs are removed, and that invalidates driver
 365          * assumptions about always getting a vif pointer that is valid
 366          * (because if we remove a STA after ops->remove_interface()
 367          * the driver will have removed the vif info already!)
 368          *
 369          * We could relax this and only unlink the stations from the
 370          * hash table and list but keep them on a per-sdata list that
 371          * will be inserted back again when the interface is brought
 372          * up again, but I don't currently see a use case for that,
 373          * except with WDS which gets a STA entry created when it is
 374          * brought up.
 375          */
 376         sta_info_flush(local, sdata);
 377
 378         /*
 379          * Don't count this interface for promisc/allmulti while it
 380          * is down. dev_mc_unsync() will invoke set_multicast_list
 381          * on the master interface which will sync these down to the
 382          * hardware as filter flags.
 383          */
 384         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 385                 atomic_dec(&local->iff_allmultis);
 386
 387         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 388                 atomic_dec(&local->iff_promiscs);
 389
 390         if (sdata->vif.type == NL80211_IFTYPE_AP)
 391                 local->fif_pspoll--;
 392
 393         netif_addr_lock_bh(dev);
 394         spin_lock_bh(&local->filter_lock);
 395         __hw_addr_unsync(&local->mc_list, &dev->mc, dev->addr_len);
 396         spin_unlock_bh(&local->filter_lock);
 397         netif_addr_unlock_bh(dev);
 398
 399         ieee80211_configure_filter(local);
 400
 401         del_timer_sync(&local->dynamic_ps_timer);
 402         cancel_work_sync(&local->dynamic_ps_enable_work);
 403
 404         /* APs need special treatment */
 405         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 406                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
 407                 struct beacon_data *old_beacon = sdata->u.ap.beacon;
 408
 409                 /* remove beacon */
 410                 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
 411                 synchronize_rcu();
 412                 kfree(old_beacon);
 413
 414                 /* down all dependent devices, that is VLANs */
 415                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
 416                                          u.vlan.list)
 417                         dev_close(vlan->dev);
 418                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
 419         }
 420
 421         local->open_count--;
 422
 423         switch (sdata->vif.type) {
 424         case NL80211_IFTYPE_AP_VLAN:
 425                 list_del(&sdata->u.vlan.list);
 426                 /* no need to tell driver */
 427                 break;
 428         case NL80211_IFTYPE_MONITOR:
 429                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 430                         local->cooked_mntrs--;
 431                         break;
 432                 }
 433
 434                 local->monitors--;
 435                 if (local->monitors == 0) {
 436                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
 437                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 438                 }
 439
 440                 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
 441                         local->fif_fcsfail--;
 442                 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
 443                         local->fif_plcpfail--;
 444                 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL) {
 445                         local->fif_pspoll--;
 446                         local->fif_control--;
 447                 }
 448                 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
 449                         local->fif_other_bss--;
 450
 451                 ieee80211_configure_filter(local);
 452                 break;
 453         case NL80211_IFTYPE_STATION:
 454                 del_timer_sync(&sdata->u.mgd.chswitch_timer);
 455                 del_timer_sync(&sdata->u.mgd.timer);
 456                 del_timer_sync(&sdata->u.mgd.conn_mon_timer);
 457                 del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
 458                 /*
 459                  * If any of the timers fired while we waited for it, it will
 460                  * have queued its work. Now the work will be running again
 461                  * but will not rearm the timer again because it checks
 462                  * whether the interface is running, which, at this point,
 463                  * it no longer is.
 464                  */
 465                 cancel_work_sync(&sdata->u.mgd.chswitch_work);
 466                 cancel_work_sync(&sdata->u.mgd.monitor_work);
 467                 cancel_work_sync(&sdata->u.mgd.beacon_connection_loss_work);
 468
 469                 /* fall through */
 470         case NL80211_IFTYPE_ADHOC:
 471                 if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
 472                         del_timer_sync(&sdata->u.ibss.timer);
 473                 /* fall through */
 474         case NL80211_IFTYPE_MESH_POINT:
 475                 if (ieee80211_vif_is_mesh(&sdata->vif)) {
 476                         /* other_bss and allmulti are always set on mesh
 477                          * ifaces */
 478                         local->fif_other_bss--;
 479                         atomic_dec(&local->iff_allmultis);
 480
 481                         ieee80211_configure_filter(local);
 482
 483                         ieee80211_stop_mesh(sdata);
 484                 }
 485                 /* fall through */
 486         default:
 487                 flush_work(&sdata->work);
 488                 /*
 489                  * When we get here, the interface is marked down.
 490                  * Call synchronize_rcu() to wait for the RX path
 491                  * should it be using the interface and enqueuing
 492                  * frames at this very time on another CPU.
 493                  */
 494                 synchronize_rcu();
 495                 skb_queue_purge(&sdata->skb_queue);
 496
 497                 if (local->scan_sdata == sdata)
 498                         ieee80211_scan_cancel(local);
 499
 500                 /*
 501                  * Disable beaconing for AP and mesh, IBSS can't
 502                  * still be joined to a network at this point.
 503                  */
 504                 if (sdata->vif.type == NL80211_IFTYPE_AP ||
 505                     sdata->vif.type == NL80211_IFTYPE_MESH_POINT) {
 506                         ieee80211_bss_info_change_notify(sdata,
 507                                 BSS_CHANGED_BEACON_ENABLED);
 508                 }
 509
 510                 /* free all remaining keys, there shouldn't be any */
 511                 ieee80211_free_keys(sdata);
 512                 drv_remove_interface(local, &sdata->vif);
 513         }
 514
 515         sdata->bss = NULL;
 516
 517         hw_reconf_flags |= __ieee80211_recalc_idle(local);
 518
 519         ieee80211_recalc_ps(local, -1);
 520
 521         if (local->open_count == 0) {
 522                 ieee80211_clear_tx_pending(local);
 523                 ieee80211_stop_device(local);
 524
 525                 /* no reconfiguring after stop! */
 526                 hw_reconf_flags = 0;
 527         }
 528
 529         /* do after stop to avoid reconfiguring when we stop anyway */
 530         if (hw_reconf_flags)
 531                 ieee80211_hw_config(local, hw_reconf_flags);
 532
 533         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 534         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 535                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
 536                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 537                         if (info->control.vif == &sdata->vif) {
 538                                 __skb_unlink(skb, &local->pending[i]);
 539                                 dev_kfree_skb_irq(skb);
 540                         }
 541                 }
 542         }
 543         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 544
 545         return 0;
 546 }
 547
 548 static void ieee80211_set_multicast_list(struct net_device *dev)
 549 {
 550         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 551         struct ieee80211_local *local = sdata->local;
 552         int allmulti, promisc, sdata_allmulti, sdata_promisc;
 553
 554         allmulti = !!(dev->flags & IFF_ALLMULTI);
 555         promisc = !!(dev->flags & IFF_PROMISC);
 556         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
 557         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
 558
 559         if (allmulti != sdata_allmulti) {
 560                 if (dev->flags & IFF_ALLMULTI)
 561                         atomic_inc(&local->iff_allmultis);
 562                 else
 563                         atomic_dec(&local->iff_allmultis);
 564                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
 565         }
 566
 567         if (promisc != sdata_promisc) {
 568                 if (dev->flags & IFF_PROMISC)
 569                         atomic_inc(&local->iff_promiscs);
 570                 else
 571                         atomic_dec(&local->iff_promiscs);
 572                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
 573         }
 574         spin_lock_bh(&local->filter_lock);
 575         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
 576         spin_unlock_bh(&local->filter_lock);
 577         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
 578 }
 579
 580 /*
 581  * Called when the netdev is removed or, by the code below, before
 582  * the interface type changes.
 583  */
 584 static void ieee80211_teardown_sdata(struct net_device *dev)
 585 {
 586         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 587         struct ieee80211_local *local = sdata->local;
 588         struct beacon_data *beacon;
 589         struct sk_buff *skb;
 590         int flushed;
 591         int i;
 592
 593         /* free extra data */
 594         ieee80211_free_keys(sdata);
 595
 596         ieee80211_debugfs_remove_netdev(sdata);
 597
 598         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
 599                 __skb_queue_purge(&sdata->fragments[i].skb_list);
 600         sdata->fragment_next = 0;
 601
 602         switch (sdata->vif.type) {
 603         case NL80211_IFTYPE_AP:
 604                 beacon = sdata->u.ap.beacon;
 605                 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
 606                 synchronize_rcu();
 607                 kfree(beacon);
 608
 609                 while ((skb = skb_dequeue(&sdata->u.ap.ps_bc_buf))) {
 610                         local->total_ps_buffered--;
 611                         dev_kfree_skb(skb);
 612                 }
 613
 614                 break;
 615         case NL80211_IFTYPE_MESH_POINT:
 616                 if (ieee80211_vif_is_mesh(&sdata->vif))
 617                         mesh_rmc_free(sdata);
 618                 break;
 619         case NL80211_IFTYPE_ADHOC:
 620                 if (WARN_ON(sdata->u.ibss.presp))
 621                         kfree_skb(sdata->u.ibss.presp);
 622                 break;
 623         case NL80211_IFTYPE_STATION:
 624         case NL80211_IFTYPE_WDS:
 625         case NL80211_IFTYPE_AP_VLAN:
 626         case NL80211_IFTYPE_MONITOR:
 627                 break;
 628         case NL80211_IFTYPE_UNSPECIFIED:
 629         case __NL80211_IFTYPE_AFTER_LAST:
 630                 BUG();
 631                 break;
 632         }
 633
 634         flushed = sta_info_flush(local, sdata);
 635         WARN_ON(flushed);
 636 }
 637
 638 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
 639                                          struct sk_buff *skb)
 640 {
 641         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
 642 }
 643
 644 static const struct net_device_ops ieee80211_dataif_ops = {
 645         .ndo_open               = ieee80211_open,
 646         .ndo_stop               = ieee80211_stop,
 647         .ndo_uninit             = ieee80211_teardown_sdata,
 648         .ndo_start_xmit         = ieee80211_subif_start_xmit,
 649         .ndo_set_multicast_list = ieee80211_set_multicast_list,
 650         .ndo_change_mtu         = ieee80211_change_mtu,
 651         .ndo_set_mac_address    = ieee80211_change_mac,
 652         .ndo_select_queue       = ieee80211_netdev_select_queue,
 653 };
 654
 655 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
 656                                           struct sk_buff *skb)
 657 {
 658         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 659         struct ieee80211_local *local = sdata->local;
 660         struct ieee80211_hdr *hdr;
 661         struct ieee80211_radiotap_header *rtap = (void *)skb->data;
 662         u8 *p;
 663
 664         if (local->hw.queues < 4)
 665                 return 0;
 666
 667         if (skb->len < 4 ||
 668             skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
 669                 return 0; /* doesn't matter, frame will be dropped */
 670
 671         hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
 672
 673         if (!ieee80211_is_data(hdr->frame_control)) {
 674                 skb->priority = 7;
 675                 return ieee802_1d_to_ac[skb->priority];
 676         }
 677         if (!ieee80211_is_data_qos(hdr->frame_control)) {
 678                 skb->priority = 0;
 679                 return ieee802_1d_to_ac[skb->priority];
 680         }
 681
 682         p = ieee80211_get_qos_ctl(hdr);
 683         skb->priority = *p & IEEE80211_QOS_CTL_TAG1D_MASK;
 684
 685         return ieee80211_downgrade_queue(local, skb);
 686 }
 687
 688 static const struct net_device_ops ieee80211_monitorif_ops = {
 689         .ndo_open               = ieee80211_open,
 690         .ndo_stop               = ieee80211_stop,
 691         .ndo_uninit             = ieee80211_teardown_sdata,
 692         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
 693         .ndo_set_multicast_list = ieee80211_set_multicast_list,
 694         .ndo_change_mtu         = ieee80211_change_mtu,
 695         .ndo_set_mac_address    = eth_mac_addr,
 696         .ndo_select_queue       = ieee80211_monitor_select_queue,
 697 };
 698
 699 static void ieee80211_if_setup(struct net_device *dev)
 700 {
 701         ether_setup(dev);
 702         dev->netdev_ops = &ieee80211_dataif_ops;
 703         dev->destructor = free_netdev;
 704 }
 705
 706 static void ieee80211_iface_work(struct work_struct *work)
 707 {
 708         struct ieee80211_sub_if_data *sdata =
 709                 container_of(work, struct ieee80211_sub_if_data, work);
 710         struct ieee80211_local *local = sdata->local;
 711         struct sk_buff *skb;
 712         struct sta_info *sta;
 713         struct ieee80211_ra_tid *ra_tid;
 714
 715         if (!ieee80211_sdata_running(sdata))
 716                 return;
 717
 718         if (local->scanning)
 719                 return;
 720
 721         /*
 722          * ieee80211_queue_work() should have picked up most cases,
 723          * here we'll pick the rest.
 724          */
 725         if (WARN(local->suspended,
 726                  "interface work scheduled while going to suspend\n"))
 727                 return;
 728
 729         /* first process frames */
 730         while ((skb = skb_dequeue(&sdata->skb_queue))) {
 731                 struct ieee80211_mgmt *mgmt = (void *)skb->data;
 732
 733                 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
 734                         ra_tid = (void *)&skb->cb;
 735                         ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
 736                                                  ra_tid->tid);
 737                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
 738                         ra_tid = (void *)&skb->cb;
 739                         ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
 740                                                 ra_tid->tid);
 741                 } else if (ieee80211_is_action(mgmt->frame_control) &&
 742                            mgmt->u.action.category == WLAN_CATEGORY_BACK) {
 743                         int len = skb->len;
 744
 745                         mutex_lock(&local->sta_mtx);
 746                         sta = sta_info_get_bss(sdata, mgmt->sa);
 747                         if (sta) {
 748                                 switch (mgmt->u.action.u.addba_req.action_code) {
 749                                 case WLAN_ACTION_ADDBA_REQ:
 750                                         ieee80211_process_addba_request(
 751                                                         local, sta, mgmt, len);
 752                                         break;
 753                                 case WLAN_ACTION_ADDBA_RESP:
 754                                         ieee80211_process_addba_resp(local, sta,
 755                                                                      mgmt, len);
 756                                         break;
 757                                 case WLAN_ACTION_DELBA:
 758                                         ieee80211_process_delba(sdata, sta,
 759                                                                 mgmt, len);
 760                                         break;
 761                                 default:
 762                                         WARN_ON(1);
 763                                         break;
 764                                 }
 765                         }
 766                         mutex_unlock(&local->sta_mtx);
 767                 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
 768                         struct ieee80211_hdr *hdr = (void *)mgmt;
 769                         /*
 770                          * So the frame isn't mgmt, but frame_control
 771                          * is at the right place anyway, of course, so
 772                          * the if statement is correct.
 773                          *
 774                          * Warn if we have other data frame types here,
 775                          * they must not get here.
 776                          */
 777                         WARN_ON(hdr->frame_control &
 778                                         cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
 779                         WARN_ON(!(hdr->seq_ctrl &
 780                                         cpu_to_le16(IEEE80211_SCTL_FRAG)));
 781                         /*
 782                          * This was a fragment of a frame, received while
 783                          * a block-ack session was active. That cannot be
 784                          * right, so terminate the session.
 785                          */
 786                         mutex_lock(&local->sta_mtx);
 787                         sta = sta_info_get_bss(sdata, mgmt->sa);
 788                         if (sta) {
 789                                 u16 tid = *ieee80211_get_qos_ctl(hdr) &
 790                                                 IEEE80211_QOS_CTL_TID_MASK;
 791
 792                                 __ieee80211_stop_rx_ba_session(
 793                                         sta, tid, WLAN_BACK_RECIPIENT,
 794                                         WLAN_REASON_QSTA_REQUIRE_SETUP);
 795                         }
 796                         mutex_unlock(&local->sta_mtx);
 797                 } else switch (sdata->vif.type) {
 798                 case NL80211_IFTYPE_STATION:
 799                         ieee80211_sta_rx_queued_mgmt(sdata, skb);
 800                         break;
 801                 case NL80211_IFTYPE_ADHOC:
 802                         ieee80211_ibss_rx_queued_mgmt(sdata, skb);
 803                         break;
 804                 case NL80211_IFTYPE_MESH_POINT:
 805                         if (!ieee80211_vif_is_mesh(&sdata->vif))
 806                                 break;
 807                         ieee80211_mesh_rx_queued_mgmt(sdata, skb);
 808                         break;
 809                 default:
 810                         WARN(1, "frame for unexpected interface type");
 811                         break;
 812                 }
 813
 814                 kfree_skb(skb);
 815         }
 816
 817         /* then other type-dependent work */
 818         switch (sdata->vif.type) {
 819         case NL80211_IFTYPE_STATION:
 820                 ieee80211_sta_work(sdata);
 821                 break;
 822         case NL80211_IFTYPE_ADHOC:
 823                 ieee80211_ibss_work(sdata);
 824                 break;
 825         case NL80211_IFTYPE_MESH_POINT:
 826                 if (!ieee80211_vif_is_mesh(&sdata->vif))
 827                         break;
 828                 ieee80211_mesh_work(sdata);
 829                 break;
 830         default:
 831                 break;
 832         }
 833 }
 834
 835
 836 /*
 837  * Helper function to initialise an interface to a specific type.
 838  */
 839 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
 840                                   enum nl80211_iftype type)
 841 {
 842         /* clear type-dependent union */
 843         memset(&sdata->u, 0, sizeof(sdata->u));
 844
 845         /* and set some type-dependent values */
 846         sdata->vif.type = type;
 847         sdata->dev->netdev_ops = &ieee80211_dataif_ops;
 848         sdata->wdev.iftype = type;
 849
 850         /* only monitor differs */
 851         sdata->dev->type = ARPHRD_ETHER;
 852
 853         skb_queue_head_init(&sdata->skb_queue);
 854         INIT_WORK(&sdata->work, ieee80211_iface_work);
 855
 856         switch (type) {
 857         case NL80211_IFTYPE_AP:
 858                 skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
 859                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
 860                 break;
 861         case NL80211_IFTYPE_STATION:
 862                 ieee80211_sta_setup_sdata(sdata);
 863                 break;
 864         case NL80211_IFTYPE_ADHOC:
 865                 ieee80211_ibss_setup_sdata(sdata);
 866                 break;
 867         case NL80211_IFTYPE_MESH_POINT:
 868                 if (ieee80211_vif_is_mesh(&sdata->vif))
 869                         ieee80211_mesh_init_sdata(sdata);
 870                 break;
 871         case NL80211_IFTYPE_MONITOR:
 872                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
 873                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
 874                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
 875                                       MONITOR_FLAG_OTHER_BSS;
 876                 break;
 877         case NL80211_IFTYPE_WDS:
 878         case NL80211_IFTYPE_AP_VLAN:
 879                 break;
 880         case NL80211_IFTYPE_UNSPECIFIED:
 881         case __NL80211_IFTYPE_AFTER_LAST:
 882                 BUG();
 883                 break;
 884         }
 885
 886         ieee80211_debugfs_add_netdev(sdata);
 887 }
 888
 889 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
 890                              enum nl80211_iftype type)
 891 {
 892         ASSERT_RTNL();
 893
 894         if (type == sdata->vif.type)
 895                 return 0;
 896
 897         /* Setting ad-hoc mode on non-IBSS channel is not supported. */
 898         if (sdata->local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS &&
 899             type == NL80211_IFTYPE_ADHOC)
 900                 return -EOPNOTSUPP;
 901
 902         /*
 903          * We could, here, on changes between IBSS/STA/MESH modes,
 904          * invoke an MLME function instead that disassociates etc.
 905          * and goes into the requested mode.
 906          */
 907
 908         if (ieee80211_sdata_running(sdata))
 909                 return -EBUSY;
 910
 911         /* Purge and reset type-dependent state. */
 912         ieee80211_teardown_sdata(sdata->dev);
 913         ieee80211_setup_sdata(sdata, type);
 914
 915         /* reset some values that shouldn't be kept across type changes */
 916         sdata->vif.bss_conf.basic_rates =
 917                 ieee80211_mandatory_rates(sdata->local,
 918                         sdata->local->hw.conf.channel->band);
 919         sdata->drop_unencrypted = 0;
 920         if (type == NL80211_IFTYPE_STATION)
 921                 sdata->u.mgd.use_4addr = false;
 922
 923         return 0;
 924 }
 925
 926 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
 927                                        struct net_device *dev,
 928                                        enum nl80211_iftype type)
 929 {
 930         struct ieee80211_sub_if_data *sdata;
 931         u64 mask, start, addr, val, inc;
 932         u8 *m;
 933         u8 tmp_addr[ETH_ALEN];
 934         int i;
 935
 936         /* default ... something at least */
 937         memcpy(dev->perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
 938
 939         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
 940             local->hw.wiphy->n_addresses <= 1)
 941                 return;
 942
 943
 944         mutex_lock(&local->iflist_mtx);
 945
 946         switch (type) {
 947         case NL80211_IFTYPE_MONITOR:
 948                 /* doesn't matter */
 949                 break;
 950         case NL80211_IFTYPE_WDS:
 951         case NL80211_IFTYPE_AP_VLAN:
 952                 /* match up with an AP interface */
 953                 list_for_each_entry(sdata, &local->interfaces, list) {
 954                         if (sdata->vif.type != NL80211_IFTYPE_AP)
 955                                 continue;
 956                         memcpy(dev->perm_addr, sdata->vif.addr, ETH_ALEN);
 957                         break;
 958                 }
 959                 /* keep default if no AP interface present */
 960                 break;
 961         default:
 962                 /* assign a new address if possible -- try n_addresses first */
 963                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
 964                         bool used = false;
 965
 966                         list_for_each_entry(sdata, &local->interfaces, list) {
 967                                 if (memcmp(local->hw.wiphy->addresses[i].addr,
 968                                            sdata->vif.addr, ETH_ALEN) == 0) {
 969                                         used = true;
 970                                         break;
 971                                 }
 972                         }
 973
 974                         if (!used) {
 975                                 memcpy(dev->perm_addr,
 976                                        local->hw.wiphy->addresses[i].addr,
 977                                        ETH_ALEN);
 978                                 break;
 979                         }
 980                 }
 981
 982                 /* try mask if available */
 983                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
 984                         break;
 985
 986                 m = local->hw.wiphy->addr_mask;
 987                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 988                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 989                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 990
 991                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
 992                         /* not a contiguous mask ... not handled now! */
 993                         printk(KERN_DEBUG "not contiguous\n");
 994                         break;
 995                 }
 996
 997                 m = local->hw.wiphy->perm_addr;
 998                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 999                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1000                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1001
1002                 inc = 1ULL<<__ffs64(mask);
1003                 val = (start & mask);
1004                 addr = (start & ~mask) | (val & mask);
1005                 do {
1006                         bool used = false;
1007
1008                         tmp_addr[5] = addr >> 0*8;
1009                         tmp_addr[4] = addr >> 1*8;
1010                         tmp_addr[3] = addr >> 2*8;
1011                         tmp_addr[2] = addr >> 3*8;
1012                         tmp_addr[1] = addr >> 4*8;
1013                         tmp_addr[0] = addr >> 5*8;
1014
1015                         val += inc;
1016
1017                         list_for_each_entry(sdata, &local->interfaces, list) {
1018                                 if (memcmp(tmp_addr, sdata->vif.addr,
1019                                                         ETH_ALEN) == 0) {
1020                                         used = true;
1021                                         break;
1022                                 }
1023                         }
1024
1025                         if (!used) {
1026                                 memcpy(dev->perm_addr, tmp_addr, ETH_ALEN);
1027                                 break;
1028                         }
1029                         addr = (start & ~mask) | (val & mask);
1030                 } while (addr != start);
1031
1032                 break;
1033         }
1034
1035         mutex_unlock(&local->iflist_mtx);
1036 }
1037
1038 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1039                      struct net_device **new_dev, enum nl80211_iftype type,
1040                      struct vif_params *params)
1041 {
1042         struct net_device *ndev;
1043         struct ieee80211_sub_if_data *sdata = NULL;
1044         int ret, i;
1045
1046         ASSERT_RTNL();
1047
1048         ndev = alloc_netdev_mq(sizeof(*sdata) + local->hw.vif_data_size,
1049                                name, ieee80211_if_setup, local->hw.queues);
1050         if (!ndev)
1051                 return -ENOMEM;
1052         dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1053
1054         ndev->needed_headroom = local->tx_headroom +
1055                                 4*6 /* four MAC addresses */
1056                                 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1057                                 + 6 /* mesh */
1058                                 + 8 /* rfc1042/bridge tunnel */
1059                                 - ETH_HLEN /* ethernet hard_header_len */
1060                                 + IEEE80211_ENCRYPT_HEADROOM;
1061         ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1062
1063         ret = dev_alloc_name(ndev, ndev->name);
1064         if (ret < 0)
1065                 goto fail;
1066
1067         ieee80211_assign_perm_addr(local, ndev, type);
1068         memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1069         SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1070
1071         /* don't use IEEE80211_DEV_TO_SUB_IF because it checks too much */
1072         sdata = netdev_priv(ndev);
1073         ndev->ieee80211_ptr = &sdata->wdev;
1074         memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1075         memcpy(sdata->name, ndev->name, IFNAMSIZ);
1076
1077         /* initialise type-independent data */
1078         sdata->wdev.wiphy = local->hw.wiphy;
1079         sdata->local = local;
1080         sdata->dev = ndev;
1081 #ifdef CONFIG_INET
1082         sdata->arp_filter_state = true;
1083 #endif
1084
1085         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1086                 skb_queue_head_init(&sdata->fragments[i].skb_list);
1087
1088         INIT_LIST_HEAD(&sdata->key_list);
1089
1090         for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1091                 struct ieee80211_supported_band *sband;
1092                 sband = local->hw.wiphy->bands[i];
1093                 sdata->rc_rateidx_mask[i] =
1094                         sband ? (1 << sband->n_bitrates) - 1 : 0;
1095         }
1096
1097         /* setup type-dependent data */
1098         ieee80211_setup_sdata(sdata, type);
1099
1100         if (params) {
1101                 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1102                 if (type == NL80211_IFTYPE_STATION)
1103                         sdata->u.mgd.use_4addr = params->use_4addr;
1104         }
1105
1106         ret = register_netdevice(ndev);
1107         if (ret)
1108                 goto fail;
1109
1110         if (ieee80211_vif_is_mesh(&sdata->vif) &&
1111             params && params->mesh_id_len)
1112                 ieee80211_sdata_set_mesh_id(sdata,
1113                                             params->mesh_id_len,
1114                                             params->mesh_id);
1115
1116         mutex_lock(&local->iflist_mtx);
1117         list_add_tail_rcu(&sdata->list, &local->interfaces);
1118         mutex_unlock(&local->iflist_mtx);
1119
1120         if (new_dev)
1121                 *new_dev = ndev;
1122
1123         return 0;
1124
1125  fail:
1126         free_netdev(ndev);
1127         return ret;
1128 }
1129
1130 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1131 {
1132         ASSERT_RTNL();
1133
1134         mutex_lock(&sdata->local->iflist_mtx);
1135         list_del_rcu(&sdata->list);
1136         mutex_unlock(&sdata->local->iflist_mtx);
1137
1138         synchronize_rcu();
1139         unregister_netdevice(sdata->dev);
1140 }
1141
1142 /*
1143  * Remove all interfaces, may only be called at hardware unregistration
1144  * time because it doesn't do RCU-safe list removals.
1145  */
1146 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1147 {
1148         struct ieee80211_sub_if_data *sdata, *tmp;
1149         LIST_HEAD(unreg_list);
1150
1151         ASSERT_RTNL();
1152
1153         mutex_lock(&local->iflist_mtx);
1154         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1155                 list_del(&sdata->list);
1156
1157                 unregister_netdevice_queue(sdata->dev, &unreg_list);
1158         }
1159         mutex_unlock(&local->iflist_mtx);
1160         unregister_netdevice_many(&unreg_list);
1161 }
1162
1163 static u32 ieee80211_idle_off(struct ieee80211_local *local,
1164                               const char *reason)
1165 {
1166         if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
1167                 return 0;
1168
1169 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1170         printk(KERN_DEBUG "%s: device no longer idle - %s\n",
1171                wiphy_name(local->hw.wiphy), reason);
1172 #endif
1173
1174         local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
1175         return IEEE80211_CONF_CHANGE_IDLE;
1176 }
1177
1178 static u32 ieee80211_idle_on(struct ieee80211_local *local)
1179 {
1180         if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
1181                 return 0;
1182
1183 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1184         printk(KERN_DEBUG "%s: device now idle\n",
1185                wiphy_name(local->hw.wiphy));
1186 #endif
1187
1188         drv_flush(local, false);
1189
1190         local->hw.conf.flags |= IEEE80211_CONF_IDLE;
1191         return IEEE80211_CONF_CHANGE_IDLE;
1192 }
1193
1194 u32 __ieee80211_recalc_idle(struct ieee80211_local *local)
1195 {
1196         struct ieee80211_sub_if_data *sdata;
1197         int count = 0;
1198
1199         if (!list_empty(&local->work_list))
1200                 return ieee80211_idle_off(local, "working");
1201
1202         if (local->scanning)
1203                 return ieee80211_idle_off(local, "scanning");
1204
1205         list_for_each_entry(sdata, &local->interfaces, list) {
1206                 if (!ieee80211_sdata_running(sdata))
1207                         continue;
1208                 /* do not count disabled managed interfaces */
1209                 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1210                     !sdata->u.mgd.associated)
1211                         continue;
1212                 /* do not count unused IBSS interfaces */
1213                 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
1214                     !sdata->u.ibss.ssid_len)
1215                         continue;
1216                 /* count everything else */
1217                 count++;
1218         }
1219
1220         if (!count)
1221                 return ieee80211_idle_on(local);
1222         else
1223                 return ieee80211_idle_off(local, "in use");
1224
1225         return 0;
1226 }
1227
1228 void ieee80211_recalc_idle(struct ieee80211_local *local)
1229 {
1230         u32 chg;
1231
1232         mutex_lock(&local->iflist_mtx);
1233         chg = __ieee80211_recalc_idle(local);
1234         mutex_unlock(&local->iflist_mtx);
1235         if (chg)
1236                 ieee80211_hw_config(local, chg);
1237 }
1238
1239 static int netdev_notify(struct notifier_block *nb,
1240                          unsigned long state,
1241                          void *ndev)
1242 {
1243         struct net_device *dev = ndev;
1244         struct ieee80211_sub_if_data *sdata;
1245
1246         if (state != NETDEV_CHANGENAME)
1247                 return 0;
1248
1249         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1250                 return 0;
1251
1252         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1253                 return 0;
1254
1255         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1256
1257         memcpy(sdata->name, dev->name, IFNAMSIZ);
1258
1259         ieee80211_debugfs_rename_netdev(sdata);
1260         return 0;
1261 }
1262
1263 static struct notifier_block mac80211_netdev_notifier = {
1264         .notifier_call = netdev_notify,
1265 };
1266
1267 int ieee80211_iface_init(void)
1268 {
1269         return register_netdevice_notifier(&mac80211_netdev_notifier);
1270 }
1271
1272 void ieee80211_iface_exit(void)
1273 {
1274         unregister_netdevice_notifier(&mac80211_netdev_notifier);
1275 }