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 NUM_NL80211_IFTYPES:
 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                 if (local->ops->napi_poll)
 191                         napi_enable(&local->napi);
 192                 /* we're brought up, everything changes */
 193                 hw_reconf_flags = ~0;
 194                 ieee80211_led_radio(local, true);
 195         }
 196
 197         /*
 198          * Check all interfaces and copy the hopefully now-present
 199          * MAC address to those that have the special null one.
 200          */
 201         list_for_each_entry(nsdata, &local->interfaces, list) {
 202                 struct net_device *ndev = nsdata->dev;
 203
 204                 /*
 205                  * No need to check running since we do not allow
 206                  * it to start up with this invalid address.
 207                  */
 208                 if (compare_ether_addr(null_addr, ndev->dev_addr) == 0) {
 209                         memcpy(ndev->dev_addr,
 210                                local->hw.wiphy->perm_addr,
 211                                ETH_ALEN);
 212                         memcpy(ndev->perm_addr, ndev->dev_addr, ETH_ALEN);
 213                 }
 214         }
 215
 216         /*
 217          * Validate the MAC address for this device.
 218          */
 219         if (!is_valid_ether_addr(dev->dev_addr)) {
 220                 if (!local->open_count)
 221                         drv_stop(local);
 222                 return -EADDRNOTAVAIL;
 223         }
 224
 225         switch (sdata->vif.type) {
 226         case NL80211_IFTYPE_AP_VLAN:
 227                 /* no need to tell driver */
 228                 break;
 229         case NL80211_IFTYPE_MONITOR:
 230                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 231                         local->cooked_mntrs++;
 232                         break;
 233                 }
 234
 235                 /* must be before the call to ieee80211_configure_filter */
 236                 local->monitors++;
 237                 if (local->monitors == 1) {
 238                         local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
 239                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 240                 }
 241
 242                 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
 243                         local->fif_fcsfail++;
 244                 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
 245                         local->fif_plcpfail++;
 246                 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL) {
 247                         local->fif_control++;
 248                         local->fif_pspoll++;
 249                 }
 250                 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
 251                         local->fif_other_bss++;
 252
 253                 ieee80211_configure_filter(local);
 254
 255                 netif_carrier_on(dev);
 256                 break;
 257         default:
 258                 res = drv_add_interface(local, &sdata->vif);
 259                 if (res)
 260                         goto err_stop;
 261
 262                 if (ieee80211_vif_is_mesh(&sdata->vif)) {
 263                         local->fif_other_bss++;
 264                         ieee80211_configure_filter(local);
 265
 266                         ieee80211_start_mesh(sdata);
 267                 } else if (sdata->vif.type == NL80211_IFTYPE_AP) {
 268                         local->fif_pspoll++;
 269
 270                         ieee80211_configure_filter(local);
 271                 }
 272
 273                 changed |= ieee80211_reset_erp_info(sdata);
 274                 ieee80211_bss_info_change_notify(sdata, changed);
 275
 276                 if (sdata->vif.type == NL80211_IFTYPE_STATION)
 277                         netif_carrier_off(dev);
 278                 else
 279                         netif_carrier_on(dev);
 280         }
 281
 282         if (sdata->vif.type == NL80211_IFTYPE_WDS) {
 283                 /* Create STA entry for the WDS peer */
 284                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
 285                                      GFP_KERNEL);
 286                 if (!sta) {
 287                         res = -ENOMEM;
 288                         goto err_del_interface;
 289                 }
 290
 291                 /* no locking required since STA is not live yet */
 292                 sta->flags |= WLAN_STA_AUTHORIZED;
 293
 294                 res = sta_info_insert(sta);
 295                 if (res) {
 296                         /* STA has been freed */
 297                         goto err_del_interface;
 298                 }
 299         }
 300
 301         /*
 302          * set_multicast_list will be invoked by the networking core
 303          * which will check whether any increments here were done in
 304          * error and sync them down to the hardware as filter flags.
 305          */
 306         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 307                 atomic_inc(&local->iff_allmultis);
 308
 309         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 310                 atomic_inc(&local->iff_promiscs);
 311
 312         mutex_lock(&local->mtx);
 313         hw_reconf_flags |= __ieee80211_recalc_idle(local);
 314         mutex_unlock(&local->mtx);
 315
 316         local->open_count++;
 317         if (hw_reconf_flags) {
 318                 ieee80211_hw_config(local, hw_reconf_flags);
 319                 /*
 320                  * set default queue parameters so drivers don't
 321                  * need to initialise the hardware if the hardware
 322                  * doesn't start up with sane defaults
 323                  */
 324                 ieee80211_set_wmm_default(sdata);
 325         }
 326
 327         ieee80211_recalc_ps(local, -1);
 328
 329         netif_tx_start_all_queues(dev);
 330
 331         return 0;
 332  err_del_interface:
 333         drv_remove_interface(local, &sdata->vif);
 334  err_stop:
 335         if (!local->open_count)
 336                 drv_stop(local);
 337  err_del_bss:
 338         sdata->bss = NULL;
 339         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
 340                 list_del(&sdata->u.vlan.list);
 341         return res;
 342 }
 343
 344 static int ieee80211_stop(struct net_device *dev)
 345 {
 346         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 347         struct ieee80211_local *local = sdata->local;
 348         unsigned long flags;
 349         struct sk_buff *skb, *tmp;
 350         u32 hw_reconf_flags = 0;
 351         int i;
 352
 353         /*
 354          * Stop TX on this interface first.
 355          */
 356         netif_tx_stop_all_queues(dev);
 357
 358         /*
 359          * Purge work for this interface.
 360          */
 361         ieee80211_work_purge(sdata);
 362
 363         /*
 364          * Remove all stations associated with this interface.
 365          *
 366          * This must be done before calling ops->remove_interface()
 367          * because otherwise we can later invoke ops->sta_notify()
 368          * whenever the STAs are removed, and that invalidates driver
 369          * assumptions about always getting a vif pointer that is valid
 370          * (because if we remove a STA after ops->remove_interface()
 371          * the driver will have removed the vif info already!)
 372          *
 373          * We could relax this and only unlink the stations from the
 374          * hash table and list but keep them on a per-sdata list that
 375          * will be inserted back again when the interface is brought
 376          * up again, but I don't currently see a use case for that,
 377          * except with WDS which gets a STA entry created when it is
 378          * brought up.
 379          */
 380         sta_info_flush(local, sdata);
 381
 382         /*
 383          * Don't count this interface for promisc/allmulti while it
 384          * is down. dev_mc_unsync() will invoke set_multicast_list
 385          * on the master interface which will sync these down to the
 386          * hardware as filter flags.
 387          */
 388         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 389                 atomic_dec(&local->iff_allmultis);
 390
 391         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 392                 atomic_dec(&local->iff_promiscs);
 393
 394         if (sdata->vif.type == NL80211_IFTYPE_AP)
 395                 local->fif_pspoll--;
 396
 397         netif_addr_lock_bh(dev);
 398         spin_lock_bh(&local->filter_lock);
 399         __hw_addr_unsync(&local->mc_list, &dev->mc, dev->addr_len);
 400         spin_unlock_bh(&local->filter_lock);
 401         netif_addr_unlock_bh(dev);
 402
 403         ieee80211_configure_filter(local);
 404
 405         del_timer_sync(&local->dynamic_ps_timer);
 406         cancel_work_sync(&local->dynamic_ps_enable_work);
 407
 408         /* APs need special treatment */
 409         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 410                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
 411                 struct beacon_data *old_beacon = sdata->u.ap.beacon;
 412
 413                 /* remove beacon */
 414                 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
 415                 synchronize_rcu();
 416                 kfree(old_beacon);
 417
 418                 /* down all dependent devices, that is VLANs */
 419                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
 420                                          u.vlan.list)
 421                         dev_close(vlan->dev);
 422                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
 423         }
 424
 425         local->open_count--;
 426
 427         switch (sdata->vif.type) {
 428         case NL80211_IFTYPE_AP_VLAN:
 429                 list_del(&sdata->u.vlan.list);
 430                 /* no need to tell driver */
 431                 break;
 432         case NL80211_IFTYPE_MONITOR:
 433                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 434                         local->cooked_mntrs--;
 435                         break;
 436                 }
 437
 438                 local->monitors--;
 439                 if (local->monitors == 0) {
 440                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
 441                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 442                 }
 443
 444                 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
 445                         local->fif_fcsfail--;
 446                 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
 447                         local->fif_plcpfail--;
 448                 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL) {
 449                         local->fif_pspoll--;
 450                         local->fif_control--;
 451                 }
 452                 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
 453                         local->fif_other_bss--;
 454
 455                 ieee80211_configure_filter(local);
 456                 break;
 457         case NL80211_IFTYPE_STATION:
 458                 del_timer_sync(&sdata->u.mgd.chswitch_timer);
 459                 del_timer_sync(&sdata->u.mgd.timer);
 460                 del_timer_sync(&sdata->u.mgd.conn_mon_timer);
 461                 del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
 462                 /*
 463                  * If any of the timers fired while we waited for it, it will
 464                  * have queued its work. Now the work will be running again
 465                  * but will not rearm the timer again because it checks
 466                  * whether the interface is running, which, at this point,
 467                  * it no longer is.
 468                  */
 469                 cancel_work_sync(&sdata->u.mgd.chswitch_work);
 470                 cancel_work_sync(&sdata->u.mgd.monitor_work);
 471                 cancel_work_sync(&sdata->u.mgd.beacon_connection_loss_work);
 472
 473                 /* fall through */
 474         case NL80211_IFTYPE_ADHOC:
 475                 if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
 476                         del_timer_sync(&sdata->u.ibss.timer);
 477                 /* fall through */
 478         case NL80211_IFTYPE_MESH_POINT:
 479                 if (ieee80211_vif_is_mesh(&sdata->vif)) {
 480                         /* other_bss and allmulti are always set on mesh
 481                          * ifaces */
 482                         local->fif_other_bss--;
 483                         atomic_dec(&local->iff_allmultis);
 484
 485                         ieee80211_configure_filter(local);
 486
 487                         ieee80211_stop_mesh(sdata);
 488                 }
 489                 /* fall through */
 490         default:
 491                 flush_work(&sdata->work);
 492                 /*
 493                  * When we get here, the interface is marked down.
 494                  * Call synchronize_rcu() to wait for the RX path
 495                  * should it be using the interface and enqueuing
 496                  * frames at this very time on another CPU.
 497                  */
 498                 synchronize_rcu();
 499                 skb_queue_purge(&sdata->skb_queue);
 500
 501                 if (local->scan_sdata == sdata)
 502                         ieee80211_scan_cancel(local);
 503
 504                 /*
 505                  * Disable beaconing for AP and mesh, IBSS can't
 506                  * still be joined to a network at this point.
 507                  */
 508                 if (sdata->vif.type == NL80211_IFTYPE_AP ||
 509                     sdata->vif.type == NL80211_IFTYPE_MESH_POINT) {
 510                         ieee80211_bss_info_change_notify(sdata,
 511                                 BSS_CHANGED_BEACON_ENABLED);
 512                 }
 513
 514                 /* free all remaining keys, there shouldn't be any */
 515                 ieee80211_free_keys(sdata);
 516                 drv_remove_interface(local, &sdata->vif);
 517         }
 518
 519         sdata->bss = NULL;
 520
 521         mutex_lock(&local->mtx);
 522         hw_reconf_flags |= __ieee80211_recalc_idle(local);
 523         mutex_unlock(&local->mtx);
 524
 525         ieee80211_recalc_ps(local, -1);
 526
 527         if (local->open_count == 0) {
 528                 if (local->ops->napi_poll)
 529                         napi_disable(&local->napi);
 530                 ieee80211_clear_tx_pending(local);
 531                 ieee80211_stop_device(local);
 532
 533                 /* no reconfiguring after stop! */
 534                 hw_reconf_flags = 0;
 535         }
 536
 537         /* do after stop to avoid reconfiguring when we stop anyway */
 538         if (hw_reconf_flags)
 539                 ieee80211_hw_config(local, hw_reconf_flags);
 540
 541         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 542         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 543                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
 544                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 545                         if (info->control.vif == &sdata->vif) {
 546                                 __skb_unlink(skb, &local->pending[i]);
 547                                 dev_kfree_skb_irq(skb);
 548                         }
 549                 }
 550         }
 551         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 552
 553         return 0;
 554 }
 555
 556 static void ieee80211_set_multicast_list(struct net_device *dev)
 557 {
 558         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 559         struct ieee80211_local *local = sdata->local;
 560         int allmulti, promisc, sdata_allmulti, sdata_promisc;
 561
 562         allmulti = !!(dev->flags & IFF_ALLMULTI);
 563         promisc = !!(dev->flags & IFF_PROMISC);
 564         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
 565         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
 566
 567         if (allmulti != sdata_allmulti) {
 568                 if (dev->flags & IFF_ALLMULTI)
 569                         atomic_inc(&local->iff_allmultis);
 570                 else
 571                         atomic_dec(&local->iff_allmultis);
 572                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
 573         }
 574
 575         if (promisc != sdata_promisc) {
 576                 if (dev->flags & IFF_PROMISC)
 577                         atomic_inc(&local->iff_promiscs);
 578                 else
 579                         atomic_dec(&local->iff_promiscs);
 580                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
 581         }
 582         spin_lock_bh(&local->filter_lock);
 583         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
 584         spin_unlock_bh(&local->filter_lock);
 585         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
 586 }
 587
 588 /*
 589  * Called when the netdev is removed or, by the code below, before
 590  * the interface type changes.
 591  */
 592 static void ieee80211_teardown_sdata(struct net_device *dev)
 593 {
 594         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 595         struct ieee80211_local *local = sdata->local;
 596         struct beacon_data *beacon;
 597         struct sk_buff *skb;
 598         int flushed;
 599         int i;
 600
 601         /* free extra data */
 602         ieee80211_free_keys(sdata);
 603
 604         ieee80211_debugfs_remove_netdev(sdata);
 605
 606         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
 607                 __skb_queue_purge(&sdata->fragments[i].skb_list);
 608         sdata->fragment_next = 0;
 609
 610         switch (sdata->vif.type) {
 611         case NL80211_IFTYPE_AP:
 612                 beacon = sdata->u.ap.beacon;
 613                 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
 614                 synchronize_rcu();
 615                 kfree(beacon);
 616
 617                 while ((skb = skb_dequeue(&sdata->u.ap.ps_bc_buf))) {
 618                         local->total_ps_buffered--;
 619                         dev_kfree_skb(skb);
 620                 }
 621
 622                 break;
 623         case NL80211_IFTYPE_MESH_POINT:
 624                 if (ieee80211_vif_is_mesh(&sdata->vif))
 625                         mesh_rmc_free(sdata);
 626                 break;
 627         case NL80211_IFTYPE_ADHOC:
 628                 if (WARN_ON(sdata->u.ibss.presp))
 629                         kfree_skb(sdata->u.ibss.presp);
 630                 break;
 631         case NL80211_IFTYPE_STATION:
 632         case NL80211_IFTYPE_WDS:
 633         case NL80211_IFTYPE_AP_VLAN:
 634         case NL80211_IFTYPE_MONITOR:
 635                 break;
 636         case NL80211_IFTYPE_UNSPECIFIED:
 637         case NUM_NL80211_IFTYPES:
 638                 BUG();
 639                 break;
 640         }
 641
 642         flushed = sta_info_flush(local, sdata);
 643         WARN_ON(flushed);
 644 }
 645
 646 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
 647                                          struct sk_buff *skb)
 648 {
 649         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
 650 }
 651
 652 static const struct net_device_ops ieee80211_dataif_ops = {
 653         .ndo_open               = ieee80211_open,
 654         .ndo_stop               = ieee80211_stop,
 655         .ndo_uninit             = ieee80211_teardown_sdata,
 656         .ndo_start_xmit         = ieee80211_subif_start_xmit,
 657         .ndo_set_multicast_list = ieee80211_set_multicast_list,
 658         .ndo_change_mtu         = ieee80211_change_mtu,
 659         .ndo_set_mac_address    = ieee80211_change_mac,
 660         .ndo_select_queue       = ieee80211_netdev_select_queue,
 661 };
 662
 663 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
 664                                           struct sk_buff *skb)
 665 {
 666         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 667         struct ieee80211_local *local = sdata->local;
 668         struct ieee80211_hdr *hdr;
 669         struct ieee80211_radiotap_header *rtap = (void *)skb->data;
 670         u8 *p;
 671
 672         if (local->hw.queues < 4)
 673                 return 0;
 674
 675         if (skb->len < 4 ||
 676             skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
 677                 return 0; /* doesn't matter, frame will be dropped */
 678
 679         hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
 680
 681         if (!ieee80211_is_data(hdr->frame_control)) {
 682                 skb->priority = 7;
 683                 return ieee802_1d_to_ac[skb->priority];
 684         }
 685         if (!ieee80211_is_data_qos(hdr->frame_control)) {
 686                 skb->priority = 0;
 687                 return ieee802_1d_to_ac[skb->priority];
 688         }
 689
 690         p = ieee80211_get_qos_ctl(hdr);
 691         skb->priority = *p & IEEE80211_QOS_CTL_TAG1D_MASK;
 692
 693         return ieee80211_downgrade_queue(local, skb);
 694 }
 695
 696 static const struct net_device_ops ieee80211_monitorif_ops = {
 697         .ndo_open               = ieee80211_open,
 698         .ndo_stop               = ieee80211_stop,
 699         .ndo_uninit             = ieee80211_teardown_sdata,
 700         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
 701         .ndo_set_multicast_list = ieee80211_set_multicast_list,
 702         .ndo_change_mtu         = ieee80211_change_mtu,
 703         .ndo_set_mac_address    = eth_mac_addr,
 704         .ndo_select_queue       = ieee80211_monitor_select_queue,
 705 };
 706
 707 static void ieee80211_if_setup(struct net_device *dev)
 708 {
 709         ether_setup(dev);
 710         dev->netdev_ops = &ieee80211_dataif_ops;
 711         dev->destructor = free_netdev;
 712 }
 713
 714 static void ieee80211_iface_work(struct work_struct *work)
 715 {
 716         struct ieee80211_sub_if_data *sdata =
 717                 container_of(work, struct ieee80211_sub_if_data, work);
 718         struct ieee80211_local *local = sdata->local;
 719         struct sk_buff *skb;
 720         struct sta_info *sta;
 721         struct ieee80211_ra_tid *ra_tid;
 722
 723         if (!ieee80211_sdata_running(sdata))
 724                 return;
 725
 726         if (local->scanning)
 727                 return;
 728
 729         /*
 730          * ieee80211_queue_work() should have picked up most cases,
 731          * here we'll pick the rest.
 732          */
 733         if (WARN(local->suspended,
 734                  "interface work scheduled while going to suspend\n"))
 735                 return;
 736
 737         /* first process frames */
 738         while ((skb = skb_dequeue(&sdata->skb_queue))) {
 739                 struct ieee80211_mgmt *mgmt = (void *)skb->data;
 740
 741                 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
 742                         ra_tid = (void *)&skb->cb;
 743                         ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
 744                                                  ra_tid->tid);
 745                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
 746                         ra_tid = (void *)&skb->cb;
 747                         ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
 748                                                 ra_tid->tid);
 749                 } else if (ieee80211_is_action(mgmt->frame_control) &&
 750                            mgmt->u.action.category == WLAN_CATEGORY_BACK) {
 751                         int len = skb->len;
 752
 753                         mutex_lock(&local->sta_mtx);
 754                         sta = sta_info_get_bss(sdata, mgmt->sa);
 755                         if (sta) {
 756                                 switch (mgmt->u.action.u.addba_req.action_code) {
 757                                 case WLAN_ACTION_ADDBA_REQ:
 758                                         ieee80211_process_addba_request(
 759                                                         local, sta, mgmt, len);
 760                                         break;
 761                                 case WLAN_ACTION_ADDBA_RESP:
 762                                         ieee80211_process_addba_resp(local, sta,
 763                                                                      mgmt, len);
 764                                         break;
 765                                 case WLAN_ACTION_DELBA:
 766                                         ieee80211_process_delba(sdata, sta,
 767                                                                 mgmt, len);
 768                                         break;
 769                                 default:
 770                                         WARN_ON(1);
 771                                         break;
 772                                 }
 773                         }
 774                         mutex_unlock(&local->sta_mtx);
 775                 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
 776                         struct ieee80211_hdr *hdr = (void *)mgmt;
 777                         /*
 778                          * So the frame isn't mgmt, but frame_control
 779                          * is at the right place anyway, of course, so
 780                          * the if statement is correct.
 781                          *
 782                          * Warn if we have other data frame types here,
 783                          * they must not get here.
 784                          */
 785                         WARN_ON(hdr->frame_control &
 786                                         cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
 787                         WARN_ON(!(hdr->seq_ctrl &
 788                                         cpu_to_le16(IEEE80211_SCTL_FRAG)));
 789                         /*
 790                          * This was a fragment of a frame, received while
 791                          * a block-ack session was active. That cannot be
 792                          * right, so terminate the session.
 793                          */
 794                         mutex_lock(&local->sta_mtx);
 795                         sta = sta_info_get_bss(sdata, mgmt->sa);
 796                         if (sta) {
 797                                 u16 tid = *ieee80211_get_qos_ctl(hdr) &
 798                                                 IEEE80211_QOS_CTL_TID_MASK;
 799
 800                                 __ieee80211_stop_rx_ba_session(
 801                                         sta, tid, WLAN_BACK_RECIPIENT,
 802                                         WLAN_REASON_QSTA_REQUIRE_SETUP);
 803                         }
 804                         mutex_unlock(&local->sta_mtx);
 805                 } else switch (sdata->vif.type) {
 806                 case NL80211_IFTYPE_STATION:
 807                         ieee80211_sta_rx_queued_mgmt(sdata, skb);
 808                         break;
 809                 case NL80211_IFTYPE_ADHOC:
 810                         ieee80211_ibss_rx_queued_mgmt(sdata, skb);
 811                         break;
 812                 case NL80211_IFTYPE_MESH_POINT:
 813                         if (!ieee80211_vif_is_mesh(&sdata->vif))
 814                                 break;
 815                         ieee80211_mesh_rx_queued_mgmt(sdata, skb);
 816                         break;
 817                 default:
 818                         WARN(1, "frame for unexpected interface type");
 819                         break;
 820                 }
 821
 822                 kfree_skb(skb);
 823         }
 824
 825         /* then other type-dependent work */
 826         switch (sdata->vif.type) {
 827         case NL80211_IFTYPE_STATION:
 828                 ieee80211_sta_work(sdata);
 829                 break;
 830         case NL80211_IFTYPE_ADHOC:
 831                 ieee80211_ibss_work(sdata);
 832                 break;
 833         case NL80211_IFTYPE_MESH_POINT:
 834                 if (!ieee80211_vif_is_mesh(&sdata->vif))
 835                         break;
 836                 ieee80211_mesh_work(sdata);
 837                 break;
 838         default:
 839                 break;
 840         }
 841 }
 842
 843
 844 /*
 845  * Helper function to initialise an interface to a specific type.
 846  */
 847 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
 848                                   enum nl80211_iftype type)
 849 {
 850         /* clear type-dependent union */
 851         memset(&sdata->u, 0, sizeof(sdata->u));
 852
 853         /* and set some type-dependent values */
 854         sdata->vif.type = type;
 855         sdata->dev->netdev_ops = &ieee80211_dataif_ops;
 856         sdata->wdev.iftype = type;
 857
 858         /* only monitor differs */
 859         sdata->dev->type = ARPHRD_ETHER;
 860
 861         skb_queue_head_init(&sdata->skb_queue);
 862         INIT_WORK(&sdata->work, ieee80211_iface_work);
 863
 864         switch (type) {
 865         case NL80211_IFTYPE_AP:
 866                 skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
 867                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
 868                 break;
 869         case NL80211_IFTYPE_STATION:
 870                 ieee80211_sta_setup_sdata(sdata);
 871                 break;
 872         case NL80211_IFTYPE_ADHOC:
 873                 ieee80211_ibss_setup_sdata(sdata);
 874                 break;
 875         case NL80211_IFTYPE_MESH_POINT:
 876                 if (ieee80211_vif_is_mesh(&sdata->vif))
 877                         ieee80211_mesh_init_sdata(sdata);
 878                 break;
 879         case NL80211_IFTYPE_MONITOR:
 880                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
 881                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
 882                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
 883                                       MONITOR_FLAG_OTHER_BSS;
 884                 break;
 885         case NL80211_IFTYPE_WDS:
 886         case NL80211_IFTYPE_AP_VLAN:
 887                 break;
 888         case NL80211_IFTYPE_UNSPECIFIED:
 889         case NUM_NL80211_IFTYPES:
 890                 BUG();
 891                 break;
 892         }
 893
 894         ieee80211_debugfs_add_netdev(sdata);
 895 }
 896
 897 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
 898                              enum nl80211_iftype type)
 899 {
 900         ASSERT_RTNL();
 901
 902         if (type == sdata->vif.type)
 903                 return 0;
 904
 905         /* Setting ad-hoc mode on non-IBSS channel is not supported. */
 906         if (sdata->local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS &&
 907             type == NL80211_IFTYPE_ADHOC)
 908                 return -EOPNOTSUPP;
 909
 910         /*
 911          * We could, here, on changes between IBSS/STA/MESH modes,
 912          * invoke an MLME function instead that disassociates etc.
 913          * and goes into the requested mode.
 914          */
 915
 916         if (ieee80211_sdata_running(sdata))
 917                 return -EBUSY;
 918
 919         /* Purge and reset type-dependent state. */
 920         ieee80211_teardown_sdata(sdata->dev);
 921         ieee80211_setup_sdata(sdata, type);
 922
 923         /* reset some values that shouldn't be kept across type changes */
 924         sdata->vif.bss_conf.basic_rates =
 925                 ieee80211_mandatory_rates(sdata->local,
 926                         sdata->local->hw.conf.channel->band);
 927         sdata->drop_unencrypted = 0;
 928         if (type == NL80211_IFTYPE_STATION)
 929                 sdata->u.mgd.use_4addr = false;
 930
 931         return 0;
 932 }
 933
 934 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
 935                                        struct net_device *dev,
 936                                        enum nl80211_iftype type)
 937 {
 938         struct ieee80211_sub_if_data *sdata;
 939         u64 mask, start, addr, val, inc;
 940         u8 *m;
 941         u8 tmp_addr[ETH_ALEN];
 942         int i;
 943
 944         /* default ... something at least */
 945         memcpy(dev->perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
 946
 947         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
 948             local->hw.wiphy->n_addresses <= 1)
 949                 return;
 950
 951
 952         mutex_lock(&local->iflist_mtx);
 953
 954         switch (type) {
 955         case NL80211_IFTYPE_MONITOR:
 956                 /* doesn't matter */
 957                 break;
 958         case NL80211_IFTYPE_WDS:
 959         case NL80211_IFTYPE_AP_VLAN:
 960                 /* match up with an AP interface */
 961                 list_for_each_entry(sdata, &local->interfaces, list) {
 962                         if (sdata->vif.type != NL80211_IFTYPE_AP)
 963                                 continue;
 964                         memcpy(dev->perm_addr, sdata->vif.addr, ETH_ALEN);
 965                         break;
 966                 }
 967                 /* keep default if no AP interface present */
 968                 break;
 969         default:
 970                 /* assign a new address if possible -- try n_addresses first */
 971                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
 972                         bool used = false;
 973
 974                         list_for_each_entry(sdata, &local->interfaces, list) {
 975                                 if (memcmp(local->hw.wiphy->addresses[i].addr,
 976                                            sdata->vif.addr, ETH_ALEN) == 0) {
 977                                         used = true;
 978                                         break;
 979                                 }
 980                         }
 981
 982                         if (!used) {
 983                                 memcpy(dev->perm_addr,
 984                                        local->hw.wiphy->addresses[i].addr,
 985                                        ETH_ALEN);
 986                                 break;
 987                         }
 988                 }
 989
 990                 /* try mask if available */
 991                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
 992                         break;
 993
 994                 m = local->hw.wiphy->addr_mask;
 995                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 996                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 997                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 998
 999                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1000                         /* not a contiguous mask ... not handled now! */
1001                         printk(KERN_DEBUG "not contiguous\n");
1002                         break;
1003                 }
1004
1005                 m = local->hw.wiphy->perm_addr;
1006                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1007                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1008                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1009
1010                 inc = 1ULL<<__ffs64(mask);
1011                 val = (start & mask);
1012                 addr = (start & ~mask) | (val & mask);
1013                 do {
1014                         bool used = false;
1015
1016                         tmp_addr[5] = addr >> 0*8;
1017                         tmp_addr[4] = addr >> 1*8;
1018                         tmp_addr[3] = addr >> 2*8;
1019                         tmp_addr[2] = addr >> 3*8;
1020                         tmp_addr[1] = addr >> 4*8;
1021                         tmp_addr[0] = addr >> 5*8;
1022
1023                         val += inc;
1024
1025                         list_for_each_entry(sdata, &local->interfaces, list) {
1026                                 if (memcmp(tmp_addr, sdata->vif.addr,
1027                                                         ETH_ALEN) == 0) {
1028                                         used = true;
1029                                         break;
1030                                 }
1031                         }
1032
1033                         if (!used) {
1034                                 memcpy(dev->perm_addr, tmp_addr, ETH_ALEN);
1035                                 break;
1036                         }
1037                         addr = (start & ~mask) | (val & mask);
1038                 } while (addr != start);
1039
1040                 break;
1041         }
1042
1043         mutex_unlock(&local->iflist_mtx);
1044 }
1045
1046 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1047                      struct net_device **new_dev, enum nl80211_iftype type,
1048                      struct vif_params *params)
1049 {
1050         struct net_device *ndev;
1051         struct ieee80211_sub_if_data *sdata = NULL;
1052         int ret, i;
1053
1054         ASSERT_RTNL();
1055
1056         ndev = alloc_netdev_mq(sizeof(*sdata) + local->hw.vif_data_size,
1057                                name, ieee80211_if_setup, local->hw.queues);
1058         if (!ndev)
1059                 return -ENOMEM;
1060         dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1061
1062         ndev->needed_headroom = local->tx_headroom +
1063                                 4*6 /* four MAC addresses */
1064                                 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1065                                 + 6 /* mesh */
1066                                 + 8 /* rfc1042/bridge tunnel */
1067                                 - ETH_HLEN /* ethernet hard_header_len */
1068                                 + IEEE80211_ENCRYPT_HEADROOM;
1069         ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1070
1071         ret = dev_alloc_name(ndev, ndev->name);
1072         if (ret < 0)
1073                 goto fail;
1074
1075         ieee80211_assign_perm_addr(local, ndev, type);
1076         memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1077         SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1078
1079         /* don't use IEEE80211_DEV_TO_SUB_IF because it checks too much */
1080         sdata = netdev_priv(ndev);
1081         ndev->ieee80211_ptr = &sdata->wdev;
1082         memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1083         memcpy(sdata->name, ndev->name, IFNAMSIZ);
1084
1085         /* initialise type-independent data */
1086         sdata->wdev.wiphy = local->hw.wiphy;
1087         sdata->local = local;
1088         sdata->dev = ndev;
1089 #ifdef CONFIG_INET
1090         sdata->arp_filter_state = true;
1091 #endif
1092
1093         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1094                 skb_queue_head_init(&sdata->fragments[i].skb_list);
1095
1096         INIT_LIST_HEAD(&sdata->key_list);
1097
1098         for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1099                 struct ieee80211_supported_band *sband;
1100                 sband = local->hw.wiphy->bands[i];
1101                 sdata->rc_rateidx_mask[i] =
1102                         sband ? (1 << sband->n_bitrates) - 1 : 0;
1103         }
1104
1105         /* setup type-dependent data */
1106         ieee80211_setup_sdata(sdata, type);
1107
1108         if (params) {
1109                 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1110                 if (type == NL80211_IFTYPE_STATION)
1111                         sdata->u.mgd.use_4addr = params->use_4addr;
1112         }
1113
1114         ret = register_netdevice(ndev);
1115         if (ret)
1116                 goto fail;
1117
1118         if (ieee80211_vif_is_mesh(&sdata->vif) &&
1119             params && params->mesh_id_len)
1120                 ieee80211_sdata_set_mesh_id(sdata,
1121                                             params->mesh_id_len,
1122                                             params->mesh_id);
1123
1124         mutex_lock(&local->iflist_mtx);
1125         list_add_tail_rcu(&sdata->list, &local->interfaces);
1126         mutex_unlock(&local->iflist_mtx);
1127
1128         if (new_dev)
1129                 *new_dev = ndev;
1130
1131         return 0;
1132
1133  fail:
1134         free_netdev(ndev);
1135         return ret;
1136 }
1137
1138 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1139 {
1140         ASSERT_RTNL();
1141
1142         mutex_lock(&sdata->local->iflist_mtx);
1143         list_del_rcu(&sdata->list);
1144         mutex_unlock(&sdata->local->iflist_mtx);
1145
1146         synchronize_rcu();
1147         unregister_netdevice(sdata->dev);
1148 }
1149
1150 /*
1151  * Remove all interfaces, may only be called at hardware unregistration
1152  * time because it doesn't do RCU-safe list removals.
1153  */
1154 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1155 {
1156         struct ieee80211_sub_if_data *sdata, *tmp;
1157         LIST_HEAD(unreg_list);
1158
1159         ASSERT_RTNL();
1160
1161         mutex_lock(&local->iflist_mtx);
1162         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1163                 list_del(&sdata->list);
1164
1165                 unregister_netdevice_queue(sdata->dev, &unreg_list);
1166         }
1167         mutex_unlock(&local->iflist_mtx);
1168         unregister_netdevice_many(&unreg_list);
1169 }
1170
1171 static u32 ieee80211_idle_off(struct ieee80211_local *local,
1172                               const char *reason)
1173 {
1174         if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
1175                 return 0;
1176
1177 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1178         printk(KERN_DEBUG "%s: device no longer idle - %s\n",
1179                wiphy_name(local->hw.wiphy), reason);
1180 #endif
1181
1182         local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
1183         return IEEE80211_CONF_CHANGE_IDLE;
1184 }
1185
1186 static u32 ieee80211_idle_on(struct ieee80211_local *local)
1187 {
1188         if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
1189                 return 0;
1190
1191 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1192         printk(KERN_DEBUG "%s: device now idle\n",
1193                wiphy_name(local->hw.wiphy));
1194 #endif
1195
1196         drv_flush(local, false);
1197
1198         local->hw.conf.flags |= IEEE80211_CONF_IDLE;
1199         return IEEE80211_CONF_CHANGE_IDLE;
1200 }
1201
1202 u32 __ieee80211_recalc_idle(struct ieee80211_local *local)
1203 {
1204         struct ieee80211_sub_if_data *sdata;
1205         int count = 0;
1206         bool working = false, scanning = false;
1207         struct ieee80211_work *wk;
1208
1209 #ifdef CONFIG_PROVE_LOCKING
1210         WARN_ON(debug_locks && !lockdep_rtnl_is_held() &&
1211                 !lockdep_is_held(&local->iflist_mtx));
1212 #endif
1213         lockdep_assert_held(&local->mtx);
1214
1215         list_for_each_entry(sdata, &local->interfaces, list) {
1216                 if (!ieee80211_sdata_running(sdata)) {
1217                         sdata->vif.bss_conf.idle = true;
1218                         continue;
1219                 }
1220
1221                 sdata->old_idle = sdata->vif.bss_conf.idle;
1222
1223                 /* do not count disabled managed interfaces */
1224                 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1225                     !sdata->u.mgd.associated) {
1226                         sdata->vif.bss_conf.idle = true;
1227                         continue;
1228                 }
1229                 /* do not count unused IBSS interfaces */
1230                 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
1231                     !sdata->u.ibss.ssid_len) {
1232                         sdata->vif.bss_conf.idle = true;
1233                         continue;
1234                 }
1235                 /* count everything else */
1236                 count++;
1237         }
1238
1239         list_for_each_entry(wk, &local->work_list, list) {
1240                 working = true;
1241                 wk->sdata->vif.bss_conf.idle = false;
1242         }
1243
1244         if (local->scan_sdata) {
1245                 scanning = true;
1246                 local->scan_sdata->vif.bss_conf.idle = false;
1247         }
1248
1249         list_for_each_entry(sdata, &local->interfaces, list) {
1250                 if (sdata->old_idle == sdata->vif.bss_conf.idle)
1251                         continue;
1252                 if (!ieee80211_sdata_running(sdata))
1253                         continue;
1254                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_IDLE);
1255         }
1256
1257         if (working)
1258                 return ieee80211_idle_off(local, "working");
1259         if (scanning)
1260                 return ieee80211_idle_off(local, "scanning");
1261         if (!count)
1262                 return ieee80211_idle_on(local);
1263         else
1264                 return ieee80211_idle_off(local, "in use");
1265
1266         return 0;
1267 }
1268
1269 void ieee80211_recalc_idle(struct ieee80211_local *local)
1270 {
1271         u32 chg;
1272
1273         mutex_lock(&local->iflist_mtx);
1274         chg = __ieee80211_recalc_idle(local);
1275         mutex_unlock(&local->iflist_mtx);
1276         if (chg)
1277                 ieee80211_hw_config(local, chg);
1278 }
1279
1280 static int netdev_notify(struct notifier_block *nb,
1281                          unsigned long state,
1282                          void *ndev)
1283 {
1284         struct net_device *dev = ndev;
1285         struct ieee80211_sub_if_data *sdata;
1286
1287         if (state != NETDEV_CHANGENAME)
1288                 return 0;
1289
1290         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1291                 return 0;
1292
1293         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1294                 return 0;
1295
1296         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1297
1298         memcpy(sdata->name, dev->name, IFNAMSIZ);
1299
1300         ieee80211_debugfs_rename_netdev(sdata);
1301         return 0;
1302 }
1303
1304 static struct notifier_block mac80211_netdev_notifier = {
1305         .notifier_call = netdev_notify,
1306 };
1307
1308 int ieee80211_iface_init(void)
1309 {
1310         return register_netdevice_notifier(&mac80211_netdev_notifier);
1311 }
1312
1313 void ieee80211_iface_exit(void)
1314 {
1315         unregister_netdevice_notifier(&mac80211_netdev_notifier);
1316 }