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/kernel.h>
  14 #include <linux/if_arp.h>
  15 #include <linux/netdevice.h>
  16 #include <linux/rtnetlink.h>
  17 #include <net/mac80211.h>
  18 #include "ieee80211_i.h"
  19 #include "sta_info.h"
  20 #include "debugfs_netdev.h"
  21 #include "mesh.h"
  22 #include "led.h"
  23 #include "driver-ops.h"
  24
  25 /**
  26  * DOC: Interface list locking
  27  *
  28  * The interface list in each struct ieee80211_local is protected
  29  * three-fold:
  30  *
  31  * (1) modifications may only be done under the RTNL
  32  * (2) modifications and readers are protected against each other by
  33  *     the iflist_mtx.
  34  * (3) modifications are done in an RCU manner so atomic readers
  35  *     can traverse the list in RCU-safe blocks.
  36  *
  37  * As a consequence, reads (traversals) of the list can be protected
  38  * by either the RTNL, the iflist_mtx or RCU.
  39  */
  40
  41
  42 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
  43 {
  44         int meshhdrlen;
  45         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
  46
  47         meshhdrlen = (sdata->vif.type == NL80211_IFTYPE_MESH_POINT) ? 5 : 0;
  48
  49         /* FIX: what would be proper limits for MTU?
  50          * This interface uses 802.3 frames. */
  51         if (new_mtu < 256 ||
  52             new_mtu > IEEE80211_MAX_DATA_LEN - 24 - 6 - meshhdrlen) {
  53                 return -EINVAL;
  54         }
  55
  56 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
  57         printk(KERN_DEBUG "%s: setting MTU %d\n", dev->name, new_mtu);
  58 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
  59         dev->mtu = new_mtu;
  60         return 0;
  61 }
  62
  63 static inline int identical_mac_addr_allowed(int type1, int type2)
  64 {
  65         return type1 == NL80211_IFTYPE_MONITOR ||
  66                 type2 == NL80211_IFTYPE_MONITOR ||
  67                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
  68                 (type1 == NL80211_IFTYPE_WDS &&
  69                         (type2 == NL80211_IFTYPE_WDS ||
  70                          type2 == NL80211_IFTYPE_AP)) ||
  71                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
  72                 (type1 == NL80211_IFTYPE_AP_VLAN &&
  73                         (type2 == NL80211_IFTYPE_AP ||
  74                          type2 == NL80211_IFTYPE_AP_VLAN));
  75 }
  76
  77 static int ieee80211_open(struct net_device *dev)
  78 {
  79         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
  80         struct ieee80211_sub_if_data *nsdata;
  81         struct ieee80211_local *local = sdata->local;
  82         struct sta_info *sta;
  83         struct ieee80211_if_init_conf conf;
  84         u32 changed = 0;
  85         int res;
  86         u32 hw_reconf_flags = 0;
  87         u8 null_addr[ETH_ALEN] = {0};
  88
  89         /* fail early if user set an invalid address */
  90         if (compare_ether_addr(dev->dev_addr, null_addr) &&
  91             !is_valid_ether_addr(dev->dev_addr))
  92                 return -EADDRNOTAVAIL;
  93
  94         /* we hold the RTNL here so can safely walk the list */
  95         list_for_each_entry(nsdata, &local->interfaces, list) {
  96                 struct net_device *ndev = nsdata->dev;
  97
  98                 if (ndev != dev && netif_running(ndev)) {
  99                         /*
 100                          * Allow only a single IBSS interface to be up at any
 101                          * time. This is restricted because beacon distribution
 102                          * cannot work properly if both are in the same IBSS.
 103                          *
 104                          * To remove this restriction we'd have to disallow them
 105                          * from setting the same SSID on different IBSS interfaces
 106                          * belonging to the same hardware. Then, however, we're
 107                          * faced with having to adopt two different TSF timers...
 108                          */
 109                         if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
 110                             nsdata->vif.type == NL80211_IFTYPE_ADHOC)
 111                                 return -EBUSY;
 112
 113                         /*
 114                          * The remaining checks are only performed for interfaces
 115                          * with the same MAC address.
 116                          */
 117                         if (compare_ether_addr(dev->dev_addr, ndev->dev_addr))
 118                                 continue;
 119
 120                         /*
 121                          * check whether it may have the same address
 122                          */
 123                         if (!identical_mac_addr_allowed(sdata->vif.type,
 124                                                         nsdata->vif.type))
 125                                 return -ENOTUNIQ;
 126
 127                         /*
 128                          * can only add VLANs to enabled APs
 129                          */
 130                         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
 131                             nsdata->vif.type == NL80211_IFTYPE_AP)
 132                                 sdata->bss = &nsdata->u.ap;
 133                 }
 134         }
 135
 136         switch (sdata->vif.type) {
 137         case NL80211_IFTYPE_WDS:
 138                 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
 139                         return -ENOLINK;
 140                 break;
 141         case NL80211_IFTYPE_AP_VLAN:
 142                 if (!sdata->bss)
 143                         return -ENOLINK;
 144                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
 145                 break;
 146         case NL80211_IFTYPE_AP:
 147                 sdata->bss = &sdata->u.ap;
 148                 break;
 149         case NL80211_IFTYPE_MESH_POINT:
 150                 if (!ieee80211_vif_is_mesh(&sdata->vif))
 151                         break;
 152                 /* mesh ifaces must set allmulti to forward mcast traffic */
 153                 atomic_inc(&local->iff_allmultis);
 154                 break;
 155         case NL80211_IFTYPE_STATION:
 156         case NL80211_IFTYPE_MONITOR:
 157         case NL80211_IFTYPE_ADHOC:
 158                 /* no special treatment */
 159                 break;
 160         case NL80211_IFTYPE_UNSPECIFIED:
 161         case __NL80211_IFTYPE_AFTER_LAST:
 162                 /* cannot happen */
 163                 WARN_ON(1);
 164                 break;
 165         }
 166
 167         if (local->open_count == 0) {
 168                 res = drv_start(local);
 169                 if (res)
 170                         goto err_del_bss;
 171                 /* we're brought up, everything changes */
 172                 hw_reconf_flags = ~0;
 173                 ieee80211_led_radio(local, true);
 174         }
 175
 176         /*
 177          * Check all interfaces and copy the hopefully now-present
 178          * MAC address to those that have the special null one.
 179          */
 180         list_for_each_entry(nsdata, &local->interfaces, list) {
 181                 struct net_device *ndev = nsdata->dev;
 182
 183                 /*
 184                  * No need to check netif_running since we do not allow
 185                  * it to start up with this invalid address.
 186                  */
 187                 if (compare_ether_addr(null_addr, ndev->dev_addr) == 0)
 188                         memcpy(ndev->dev_addr,
 189                                local->hw.wiphy->perm_addr,
 190                                ETH_ALEN);
 191         }
 192
 193         /*
 194          * Validate the MAC address for this device.
 195          */
 196         if (!is_valid_ether_addr(dev->dev_addr)) {
 197                 if (!local->open_count)
 198                         drv_stop(local);
 199                 return -EADDRNOTAVAIL;
 200         }
 201
 202         switch (sdata->vif.type) {
 203         case NL80211_IFTYPE_AP_VLAN:
 204                 /* no need to tell driver */
 205                 break;
 206         case NL80211_IFTYPE_MONITOR:
 207                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 208                         local->cooked_mntrs++;
 209                         break;
 210                 }
 211
 212                 /* must be before the call to ieee80211_configure_filter */
 213                 local->monitors++;
 214                 if (local->monitors == 1) {
 215                         local->hw.conf.flags |= IEEE80211_CONF_RADIOTAP;
 216                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_RADIOTAP;
 217                 }
 218
 219                 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
 220                         local->fif_fcsfail++;
 221                 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
 222                         local->fif_plcpfail++;
 223                 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL)
 224                         local->fif_control++;
 225                 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
 226                         local->fif_other_bss++;
 227
 228                 spin_lock_bh(&local->filter_lock);
 229                 ieee80211_configure_filter(local);
 230                 spin_unlock_bh(&local->filter_lock);
 231                 break;
 232         default:
 233                 conf.vif = &sdata->vif;
 234                 conf.type = sdata->vif.type;
 235                 conf.mac_addr = dev->dev_addr;
 236                 res = drv_add_interface(local, &conf);
 237                 if (res)
 238                         goto err_stop;
 239
 240                 if (ieee80211_vif_is_mesh(&sdata->vif)) {
 241                         local->fif_other_bss++;
 242                         spin_lock_bh(&local->filter_lock);
 243                         ieee80211_configure_filter(local);
 244                         spin_unlock_bh(&local->filter_lock);
 245
 246                         ieee80211_start_mesh(sdata);
 247                 }
 248                 changed |= ieee80211_reset_erp_info(sdata);
 249                 ieee80211_bss_info_change_notify(sdata, changed);
 250                 ieee80211_enable_keys(sdata);
 251
 252                 if (sdata->vif.type == NL80211_IFTYPE_STATION)
 253                         netif_carrier_off(dev);
 254                 else
 255                         netif_carrier_on(dev);
 256         }
 257
 258         if (sdata->vif.type == NL80211_IFTYPE_WDS) {
 259                 /* Create STA entry for the WDS peer */
 260                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
 261                                      GFP_KERNEL);
 262                 if (!sta) {
 263                         res = -ENOMEM;
 264                         goto err_del_interface;
 265                 }
 266
 267                 /* no locking required since STA is not live yet */
 268                 sta->flags |= WLAN_STA_AUTHORIZED;
 269
 270                 res = sta_info_insert(sta);
 271                 if (res) {
 272                         /* STA has been freed */
 273                         goto err_del_interface;
 274                 }
 275         }
 276
 277         if (local->open_count == 0) {
 278                 tasklet_enable(&local->tx_pending_tasklet);
 279                 tasklet_enable(&local->tasklet);
 280         }
 281
 282         /*
 283          * set_multicast_list will be invoked by the networking core
 284          * which will check whether any increments here were done in
 285          * error and sync them down to the hardware as filter flags.
 286          */
 287         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 288                 atomic_inc(&local->iff_allmultis);
 289
 290         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 291                 atomic_inc(&local->iff_promiscs);
 292
 293         hw_reconf_flags |= __ieee80211_recalc_idle(local);
 294
 295         local->open_count++;
 296         if (hw_reconf_flags) {
 297                 ieee80211_hw_config(local, hw_reconf_flags);
 298                 /*
 299                  * set default queue parameters so drivers don't
 300                  * need to initialise the hardware if the hardware
 301                  * doesn't start up with sane defaults
 302                  */
 303                 ieee80211_set_wmm_default(sdata);
 304         }
 305
 306         ieee80211_recalc_ps(local, -1);
 307
 308         /*
 309          * ieee80211_sta_work is disabled while network interface
 310          * is down. Therefore, some configuration changes may not
 311          * yet be effective. Trigger execution of ieee80211_sta_work
 312          * to fix this.
 313          */
 314         if (sdata->vif.type == NL80211_IFTYPE_STATION)
 315                 queue_work(local->hw.workqueue, &sdata->u.mgd.work);
 316
 317         netif_tx_start_all_queues(dev);
 318
 319         return 0;
 320  err_del_interface:
 321         drv_remove_interface(local, &conf);
 322  err_stop:
 323         if (!local->open_count)
 324                 drv_stop(local);
 325  err_del_bss:
 326         sdata->bss = NULL;
 327         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
 328                 list_del(&sdata->u.vlan.list);
 329         return res;
 330 }
 331
 332 static int ieee80211_stop(struct net_device *dev)
 333 {
 334         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 335         struct ieee80211_local *local = sdata->local;
 336         struct ieee80211_if_init_conf conf;
 337         struct sta_info *sta;
 338         unsigned long flags;
 339         struct sk_buff *skb, *tmp;
 340         u32 hw_reconf_flags = 0;
 341         int i;
 342
 343         /*
 344          * Stop TX on this interface first.
 345          */
 346         netif_tx_stop_all_queues(dev);
 347
 348         /*
 349          * Now delete all active aggregation sessions.
 350          */
 351         rcu_read_lock();
 352
 353         list_for_each_entry_rcu(sta, &local->sta_list, list) {
 354                 if (sta->sdata == sdata)
 355                         ieee80211_sta_tear_down_BA_sessions(sta);
 356         }
 357
 358         rcu_read_unlock();
 359
 360         /*
 361          * Remove all stations associated with this interface.
 362          *
 363          * This must be done before calling ops->remove_interface()
 364          * because otherwise we can later invoke ops->sta_notify()
 365          * whenever the STAs are removed, and that invalidates driver
 366          * assumptions about always getting a vif pointer that is valid
 367          * (because if we remove a STA after ops->remove_interface()
 368          * the driver will have removed the vif info already!)
 369          *
 370          * We could relax this and only unlink the stations from the
 371          * hash table and list but keep them on a per-sdata list that
 372          * will be inserted back again when the interface is brought
 373          * up again, but I don't currently see a use case for that,
 374          * except with WDS which gets a STA entry created when it is
 375          * brought up.
 376          */
 377         sta_info_flush(local, sdata);
 378
 379         /*
 380          * Don't count this interface for promisc/allmulti while it
 381          * is down. dev_mc_unsync() will invoke set_multicast_list
 382          * on the master interface which will sync these down to the
 383          * hardware as filter flags.
 384          */
 385         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 386                 atomic_dec(&local->iff_allmultis);
 387
 388         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 389                 atomic_dec(&local->iff_promiscs);
 390
 391         netif_addr_lock_bh(dev);
 392         spin_lock_bh(&local->filter_lock);
 393         __dev_addr_unsync(&local->mc_list, &local->mc_count,
 394                           &dev->mc_list, &dev->mc_count);
 395         ieee80211_configure_filter(local);
 396         spin_unlock_bh(&local->filter_lock);
 397         netif_addr_unlock_bh(dev);
 398
 399         del_timer_sync(&local->dynamic_ps_timer);
 400         cancel_work_sync(&local->dynamic_ps_enable_work);
 401
 402         /* APs need special treatment */
 403         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 404                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
 405                 struct beacon_data *old_beacon = sdata->u.ap.beacon;
 406
 407                 /* remove beacon */
 408                 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
 409                 synchronize_rcu();
 410                 kfree(old_beacon);
 411
 412                 /* down all dependent devices, that is VLANs */
 413                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
 414                                          u.vlan.list)
 415                         dev_close(vlan->dev);
 416                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
 417         }
 418
 419         local->open_count--;
 420
 421         switch (sdata->vif.type) {
 422         case NL80211_IFTYPE_AP_VLAN:
 423                 list_del(&sdata->u.vlan.list);
 424                 /* no need to tell driver */
 425                 break;
 426         case NL80211_IFTYPE_MONITOR:
 427                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 428                         local->cooked_mntrs--;
 429                         break;
 430                 }
 431
 432                 local->monitors--;
 433                 if (local->monitors == 0) {
 434                         local->hw.conf.flags &= ~IEEE80211_CONF_RADIOTAP;
 435                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_RADIOTAP;
 436                 }
 437
 438                 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
 439                         local->fif_fcsfail--;
 440                 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
 441                         local->fif_plcpfail--;
 442                 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL)
 443                         local->fif_control--;
 444                 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
 445                         local->fif_other_bss--;
 446
 447                 spin_lock_bh(&local->filter_lock);
 448                 ieee80211_configure_filter(local);
 449                 spin_unlock_bh(&local->filter_lock);
 450                 break;
 451         case NL80211_IFTYPE_STATION:
 452                 del_timer_sync(&sdata->u.mgd.chswitch_timer);
 453                 del_timer_sync(&sdata->u.mgd.timer);
 454                 del_timer_sync(&sdata->u.mgd.conn_mon_timer);
 455                 del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
 456                 /*
 457                  * If any of the timers fired while we waited for it, it will
 458                  * have queued its work. Now the work will be running again
 459                  * but will not rearm the timer again because it checks
 460                  * whether the interface is running, which, at this point,
 461                  * it no longer is.
 462                  */
 463                 cancel_work_sync(&sdata->u.mgd.work);
 464                 cancel_work_sync(&sdata->u.mgd.chswitch_work);
 465                 cancel_work_sync(&sdata->u.mgd.monitor_work);
 466                 cancel_work_sync(&sdata->u.mgd.beacon_loss_work);
 467
 468                 /*
 469                  * When we get here, the interface is marked down.
 470                  * Call synchronize_rcu() to wait for the RX path
 471                  * should it be using the interface and enqueuing
 472                  * frames at this very time on another CPU.
 473                  */
 474                 synchronize_rcu();
 475                 skb_queue_purge(&sdata->u.mgd.skb_queue);
 476                 /* fall through */
 477         case NL80211_IFTYPE_ADHOC:
 478                 if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 479                         del_timer_sync(&sdata->u.ibss.timer);
 480                         cancel_work_sync(&sdata->u.ibss.work);
 481                         synchronize_rcu();
 482                         skb_queue_purge(&sdata->u.ibss.skb_queue);
 483                 }
 484                 /* fall through */
 485         case NL80211_IFTYPE_MESH_POINT:
 486                 if (ieee80211_vif_is_mesh(&sdata->vif)) {
 487                         /* other_bss and allmulti are always set on mesh
 488                          * ifaces */
 489                         local->fif_other_bss--;
 490                         atomic_dec(&local->iff_allmultis);
 491
 492                         spin_lock_bh(&local->filter_lock);
 493                         ieee80211_configure_filter(local);
 494                         spin_unlock_bh(&local->filter_lock);
 495
 496                         ieee80211_stop_mesh(sdata);
 497                 }
 498                 /* fall through */
 499         default:
 500                 if (local->scan_sdata == sdata) {
 501                         if (!local->ops->hw_scan)
 502                                 cancel_delayed_work_sync(&local->scan_work);
 503                         /*
 504                          * The software scan can no longer run now, so we can
 505                          * clear out the scan_sdata reference. However, the
 506                          * hardware scan may still be running. The complete
 507                          * function must be prepared to handle a NULL value.
 508                          */
 509                         local->scan_sdata = NULL;
 510                         /*
 511                          * The memory barrier guarantees that another CPU
 512                          * that is hardware-scanning will now see the fact
 513                          * that this interface is gone.
 514                          */
 515                         smp_mb();
 516                         /*
 517                          * If software scanning, complete the scan but since
 518                          * the scan_sdata is NULL already don't send out a
 519                          * scan event to userspace -- the scan is incomplete.
 520                          */
 521                         if (test_bit(SCAN_SW_SCANNING, &local->scanning))
 522                                 ieee80211_scan_completed(&local->hw, true);
 523                 }
 524
 525                 /*
 526                  * Disable beaconing for AP and mesh, IBSS can't
 527                  * still be joined to a network at this point.
 528                  */
 529                 if (sdata->vif.type == NL80211_IFTYPE_AP ||
 530                     sdata->vif.type == NL80211_IFTYPE_MESH_POINT) {
 531                         ieee80211_bss_info_change_notify(sdata,
 532                                 BSS_CHANGED_BEACON_ENABLED);
 533                 }
 534
 535                 conf.vif = &sdata->vif;
 536                 conf.type = sdata->vif.type;
 537                 conf.mac_addr = dev->dev_addr;
 538                 /* disable all keys for as long as this netdev is down */
 539                 ieee80211_disable_keys(sdata);
 540                 drv_remove_interface(local, &conf);
 541         }
 542
 543         sdata->bss = NULL;
 544
 545         hw_reconf_flags |= __ieee80211_recalc_idle(local);
 546
 547         ieee80211_recalc_ps(local, -1);
 548
 549         if (local->open_count == 0) {
 550                 drv_stop(local);
 551
 552                 ieee80211_led_radio(local, false);
 553
 554                 flush_workqueue(local->hw.workqueue);
 555
 556                 tasklet_disable(&local->tx_pending_tasklet);
 557                 tasklet_disable(&local->tasklet);
 558
 559                 /* no reconfiguring after stop! */
 560                 hw_reconf_flags = 0;
 561         }
 562
 563         /* do after stop to avoid reconfiguring when we stop anyway */
 564         if (hw_reconf_flags)
 565                 ieee80211_hw_config(local, hw_reconf_flags);
 566
 567         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 568         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 569                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
 570                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 571                         if (info->control.vif == &sdata->vif) {
 572                                 __skb_unlink(skb, &local->pending[i]);
 573                                 dev_kfree_skb_irq(skb);
 574                         }
 575                 }
 576         }
 577         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 578
 579         return 0;
 580 }
 581
 582 static void ieee80211_set_multicast_list(struct net_device *dev)
 583 {
 584         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 585         struct ieee80211_local *local = sdata->local;
 586         int allmulti, promisc, sdata_allmulti, sdata_promisc;
 587
 588         allmulti = !!(dev->flags & IFF_ALLMULTI);
 589         promisc = !!(dev->flags & IFF_PROMISC);
 590         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
 591         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
 592
 593         if (allmulti != sdata_allmulti) {
 594                 if (dev->flags & IFF_ALLMULTI)
 595                         atomic_inc(&local->iff_allmultis);
 596                 else
 597                         atomic_dec(&local->iff_allmultis);
 598                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
 599         }
 600
 601         if (promisc != sdata_promisc) {
 602                 if (dev->flags & IFF_PROMISC)
 603                         atomic_inc(&local->iff_promiscs);
 604                 else
 605                         atomic_dec(&local->iff_promiscs);
 606                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
 607         }
 608         spin_lock_bh(&local->filter_lock);
 609         __dev_addr_sync(&local->mc_list, &local->mc_count,
 610                         &dev->mc_list, &dev->mc_count);
 611         ieee80211_configure_filter(local);
 612         spin_unlock_bh(&local->filter_lock);
 613 }
 614
 615 /*
 616  * Called when the netdev is removed or, by the code below, before
 617  * the interface type changes.
 618  */
 619 static void ieee80211_teardown_sdata(struct net_device *dev)
 620 {
 621         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 622         struct ieee80211_local *local = sdata->local;
 623         struct beacon_data *beacon;
 624         struct sk_buff *skb;
 625         int flushed;
 626         int i;
 627
 628         /* free extra data */
 629         ieee80211_free_keys(sdata);
 630
 631         ieee80211_debugfs_remove_netdev(sdata);
 632
 633         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
 634                 __skb_queue_purge(&sdata->fragments[i].skb_list);
 635         sdata->fragment_next = 0;
 636
 637         switch (sdata->vif.type) {
 638         case NL80211_IFTYPE_AP:
 639                 beacon = sdata->u.ap.beacon;
 640                 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
 641                 synchronize_rcu();
 642                 kfree(beacon);
 643
 644                 while ((skb = skb_dequeue(&sdata->u.ap.ps_bc_buf))) {
 645                         local->total_ps_buffered--;
 646                         dev_kfree_skb(skb);
 647                 }
 648
 649                 break;
 650         case NL80211_IFTYPE_MESH_POINT:
 651                 if (ieee80211_vif_is_mesh(&sdata->vif))
 652                         mesh_rmc_free(sdata);
 653                 break;
 654         case NL80211_IFTYPE_ADHOC:
 655                 if (WARN_ON(sdata->u.ibss.presp))
 656                         kfree_skb(sdata->u.ibss.presp);
 657                 break;
 658         case NL80211_IFTYPE_STATION:
 659         case NL80211_IFTYPE_WDS:
 660         case NL80211_IFTYPE_AP_VLAN:
 661         case NL80211_IFTYPE_MONITOR:
 662                 break;
 663         case NL80211_IFTYPE_UNSPECIFIED:
 664         case __NL80211_IFTYPE_AFTER_LAST:
 665                 BUG();
 666                 break;
 667         }
 668
 669         flushed = sta_info_flush(local, sdata);
 670         WARN_ON(flushed);
 671 }
 672
 673 static const struct net_device_ops ieee80211_dataif_ops = {
 674         .ndo_open               = ieee80211_open,
 675         .ndo_stop               = ieee80211_stop,
 676         .ndo_uninit             = ieee80211_teardown_sdata,
 677         .ndo_start_xmit         = ieee80211_subif_start_xmit,
 678         .ndo_set_multicast_list = ieee80211_set_multicast_list,
 679         .ndo_change_mtu         = ieee80211_change_mtu,
 680         .ndo_set_mac_address    = eth_mac_addr,
 681 };
 682
 683 static const struct net_device_ops ieee80211_monitorif_ops = {
 684         .ndo_open               = ieee80211_open,
 685         .ndo_stop               = ieee80211_stop,
 686         .ndo_uninit             = ieee80211_teardown_sdata,
 687         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
 688         .ndo_set_multicast_list = ieee80211_set_multicast_list,
 689         .ndo_change_mtu         = ieee80211_change_mtu,
 690         .ndo_set_mac_address    = eth_mac_addr,
 691 };
 692
 693 static void ieee80211_if_setup(struct net_device *dev)
 694 {
 695         ether_setup(dev);
 696         dev->netdev_ops = &ieee80211_dataif_ops;
 697         dev->destructor = free_netdev;
 698 }
 699
 700 /*
 701  * Helper function to initialise an interface to a specific type.
 702  */
 703 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
 704                                   enum nl80211_iftype type)
 705 {
 706         /* clear type-dependent union */
 707         memset(&sdata->u, 0, sizeof(sdata->u));
 708
 709         /* and set some type-dependent values */
 710         sdata->vif.type = type;
 711         sdata->dev->netdev_ops = &ieee80211_dataif_ops;
 712         sdata->wdev.iftype = type;
 713
 714         /* only monitor differs */
 715         sdata->dev->type = ARPHRD_ETHER;
 716
 717         switch (type) {
 718         case NL80211_IFTYPE_AP:
 719                 skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
 720                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
 721                 break;
 722         case NL80211_IFTYPE_STATION:
 723                 ieee80211_sta_setup_sdata(sdata);
 724                 break;
 725         case NL80211_IFTYPE_ADHOC:
 726                 ieee80211_ibss_setup_sdata(sdata);
 727                 break;
 728         case NL80211_IFTYPE_MESH_POINT:
 729                 if (ieee80211_vif_is_mesh(&sdata->vif))
 730                         ieee80211_mesh_init_sdata(sdata);
 731                 break;
 732         case NL80211_IFTYPE_MONITOR:
 733                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
 734                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
 735                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
 736                                       MONITOR_FLAG_OTHER_BSS;
 737                 break;
 738         case NL80211_IFTYPE_WDS:
 739         case NL80211_IFTYPE_AP_VLAN:
 740                 break;
 741         case NL80211_IFTYPE_UNSPECIFIED:
 742         case __NL80211_IFTYPE_AFTER_LAST:
 743                 BUG();
 744                 break;
 745         }
 746
 747         ieee80211_debugfs_add_netdev(sdata);
 748 }
 749
 750 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
 751                              enum nl80211_iftype type)
 752 {
 753         ASSERT_RTNL();
 754
 755         if (type == sdata->vif.type)
 756                 return 0;
 757
 758         /* Setting ad-hoc mode on non-IBSS channel is not supported. */
 759         if (sdata->local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS &&
 760             type == NL80211_IFTYPE_ADHOC)
 761                 return -EOPNOTSUPP;
 762
 763         /*
 764          * We could, here, on changes between IBSS/STA/MESH modes,
 765          * invoke an MLME function instead that disassociates etc.
 766          * and goes into the requested mode.
 767          */
 768
 769         if (netif_running(sdata->dev))
 770                 return -EBUSY;
 771
 772         /* Purge and reset type-dependent state. */
 773         ieee80211_teardown_sdata(sdata->dev);
 774         ieee80211_setup_sdata(sdata, type);
 775
 776         /* reset some values that shouldn't be kept across type changes */
 777         sdata->vif.bss_conf.basic_rates =
 778                 ieee80211_mandatory_rates(sdata->local,
 779                         sdata->local->hw.conf.channel->band);
 780         sdata->drop_unencrypted = 0;
 781
 782         return 0;
 783 }
 784
 785 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
 786                      struct net_device **new_dev, enum nl80211_iftype type,
 787                      struct vif_params *params)
 788 {
 789         struct net_device *ndev;
 790         struct ieee80211_sub_if_data *sdata = NULL;
 791         int ret, i;
 792
 793         ASSERT_RTNL();
 794
 795         ndev = alloc_netdev(sizeof(*sdata) + local->hw.vif_data_size,
 796                             name, ieee80211_if_setup);
 797         if (!ndev)
 798                 return -ENOMEM;
 799         dev_net_set(ndev, wiphy_net(local->hw.wiphy));
 800
 801         ndev->needed_headroom = local->tx_headroom +
 802                                 4*6 /* four MAC addresses */
 803                                 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
 804                                 + 6 /* mesh */
 805                                 + 8 /* rfc1042/bridge tunnel */
 806                                 - ETH_HLEN /* ethernet hard_header_len */
 807                                 + IEEE80211_ENCRYPT_HEADROOM;
 808         ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
 809
 810         ret = dev_alloc_name(ndev, ndev->name);
 811         if (ret < 0)
 812                 goto fail;
 813
 814         memcpy(ndev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
 815         SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
 816
 817         /* don't use IEEE80211_DEV_TO_SUB_IF because it checks too much */
 818         sdata = netdev_priv(ndev);
 819         ndev->ieee80211_ptr = &sdata->wdev;
 820
 821         /* initialise type-independent data */
 822         sdata->wdev.wiphy = local->hw.wiphy;
 823         sdata->local = local;
 824         sdata->dev = ndev;
 825
 826         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
 827                 skb_queue_head_init(&sdata->fragments[i].skb_list);
 828
 829         INIT_LIST_HEAD(&sdata->key_list);
 830
 831         sdata->force_unicast_rateidx = -1;
 832         sdata->max_ratectrl_rateidx = -1;
 833
 834         /* setup type-dependent data */
 835         ieee80211_setup_sdata(sdata, type);
 836
 837         ret = register_netdevice(ndev);
 838         if (ret)
 839                 goto fail;
 840
 841         if (ieee80211_vif_is_mesh(&sdata->vif) &&
 842             params && params->mesh_id_len)
 843                 ieee80211_sdata_set_mesh_id(sdata,
 844                                             params->mesh_id_len,
 845                                             params->mesh_id);
 846
 847         mutex_lock(&local->iflist_mtx);
 848         list_add_tail_rcu(&sdata->list, &local->interfaces);
 849         mutex_unlock(&local->iflist_mtx);
 850
 851         if (new_dev)
 852                 *new_dev = ndev;
 853
 854         return 0;
 855
 856  fail:
 857         free_netdev(ndev);
 858         return ret;
 859 }
 860
 861 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
 862 {
 863         ASSERT_RTNL();
 864
 865         mutex_lock(&sdata->local->iflist_mtx);
 866         list_del_rcu(&sdata->list);
 867         mutex_unlock(&sdata->local->iflist_mtx);
 868
 869         synchronize_rcu();
 870         unregister_netdevice(sdata->dev);
 871 }
 872
 873 /*
 874  * Remove all interfaces, may only be called at hardware unregistration
 875  * time because it doesn't do RCU-safe list removals.
 876  */
 877 void ieee80211_remove_interfaces(struct ieee80211_local *local)
 878 {
 879         struct ieee80211_sub_if_data *sdata, *tmp;
 880
 881         ASSERT_RTNL();
 882
 883         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
 884                 /*
 885                  * we cannot hold the iflist_mtx across unregister_netdevice,
 886                  * but we only need to hold it for list modifications to lock
 887                  * out readers since we're under the RTNL here as all other
 888                  * writers.
 889                  */
 890                 mutex_lock(&local->iflist_mtx);
 891                 list_del(&sdata->list);
 892                 mutex_unlock(&local->iflist_mtx);
 893
 894                 unregister_netdevice(sdata->dev);
 895         }
 896 }
 897
 898 static u32 ieee80211_idle_off(struct ieee80211_local *local,
 899                               const char *reason)
 900 {
 901         if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
 902                 return 0;
 903
 904 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 905         printk(KERN_DEBUG "%s: device no longer idle - %s\n",
 906                wiphy_name(local->hw.wiphy), reason);
 907 #endif
 908
 909         local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
 910         return IEEE80211_CONF_CHANGE_IDLE;
 911 }
 912
 913 static u32 ieee80211_idle_on(struct ieee80211_local *local)
 914 {
 915         if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
 916                 return 0;
 917
 918 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 919         printk(KERN_DEBUG "%s: device now idle\n",
 920                wiphy_name(local->hw.wiphy));
 921 #endif
 922
 923         local->hw.conf.flags |= IEEE80211_CONF_IDLE;
 924         return IEEE80211_CONF_CHANGE_IDLE;
 925 }
 926
 927 u32 __ieee80211_recalc_idle(struct ieee80211_local *local)
 928 {
 929         struct ieee80211_sub_if_data *sdata;
 930         int count = 0;
 931
 932         if (local->scanning)
 933                 return ieee80211_idle_off(local, "scanning");
 934
 935         list_for_each_entry(sdata, &local->interfaces, list) {
 936                 if (!netif_running(sdata->dev))
 937                         continue;
 938                 /* do not count disabled managed interfaces */
 939                 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
 940                     !sdata->u.mgd.associated &&
 941                     list_empty(&sdata->u.mgd.work_list))
 942                         continue;
 943                 /* do not count unused IBSS interfaces */
 944                 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
 945                     !sdata->u.ibss.ssid_len)
 946                         continue;
 947                 /* count everything else */
 948                 count++;
 949         }
 950
 951         if (!count)
 952                 return ieee80211_idle_on(local);
 953         else
 954                 return ieee80211_idle_off(local, "in use");
 955
 956         return 0;
 957 }
 958
 959 void ieee80211_recalc_idle(struct ieee80211_local *local)
 960 {
 961         u32 chg;
 962
 963         mutex_lock(&local->iflist_mtx);
 964         chg = __ieee80211_recalc_idle(local);
 965         mutex_unlock(&local->iflist_mtx);
 966         if (chg)
 967                 ieee80211_hw_config(local, chg);
 968 }