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                         local->fif_pspoll++;
 226                 }
 227                 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
 228                         local->fif_other_bss++;
 229
 230                 ieee80211_configure_filter(local);
 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                         ieee80211_configure_filter(local);
 243
 244                         ieee80211_start_mesh(sdata);
 245                 } else if (sdata->vif.type == NL80211_IFTYPE_AP) {
 246                         local->fif_pspoll++;
 247
 248                         ieee80211_configure_filter(local);
 249                 }
 250
 251                 changed |= ieee80211_reset_erp_info(sdata);
 252                 ieee80211_bss_info_change_notify(sdata, changed);
 253                 ieee80211_enable_keys(sdata);
 254
 255                 if (sdata->vif.type == NL80211_IFTYPE_STATION)
 256                         netif_carrier_off(dev);
 257                 else
 258                         netif_carrier_on(dev);
 259         }
 260
 261         if (sdata->vif.type == NL80211_IFTYPE_WDS) {
 262                 /* Create STA entry for the WDS peer */
 263                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
 264                                      GFP_KERNEL);
 265                 if (!sta) {
 266                         res = -ENOMEM;
 267                         goto err_del_interface;
 268                 }
 269
 270                 /* no locking required since STA is not live yet */
 271                 sta->flags |= WLAN_STA_AUTHORIZED;
 272
 273                 res = sta_info_insert(sta);
 274                 if (res) {
 275                         /* STA has been freed */
 276                         goto err_del_interface;
 277                 }
 278         }
 279
 280         /*
 281          * set_multicast_list will be invoked by the networking core
 282          * which will check whether any increments here were done in
 283          * error and sync them down to the hardware as filter flags.
 284          */
 285         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 286                 atomic_inc(&local->iff_allmultis);
 287
 288         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 289                 atomic_inc(&local->iff_promiscs);
 290
 291         hw_reconf_flags |= __ieee80211_recalc_idle(local);
 292
 293         local->open_count++;
 294         if (hw_reconf_flags) {
 295                 ieee80211_hw_config(local, hw_reconf_flags);
 296                 /*
 297                  * set default queue parameters so drivers don't
 298                  * need to initialise the hardware if the hardware
 299                  * doesn't start up with sane defaults
 300                  */
 301                 ieee80211_set_wmm_default(sdata);
 302         }
 303
 304         ieee80211_recalc_ps(local, -1);
 305
 306         /*
 307          * ieee80211_sta_work is disabled while network interface
 308          * is down. Therefore, some configuration changes may not
 309          * yet be effective. Trigger execution of ieee80211_sta_work
 310          * to fix this.
 311          */
 312         if (sdata->vif.type == NL80211_IFTYPE_STATION)
 313                 ieee80211_queue_work(&local->hw, &sdata->u.mgd.work);
 314
 315         netif_tx_start_all_queues(dev);
 316
 317         return 0;
 318  err_del_interface:
 319         drv_remove_interface(local, &conf);
 320  err_stop:
 321         if (!local->open_count)
 322                 drv_stop(local);
 323  err_del_bss:
 324         sdata->bss = NULL;
 325         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
 326                 list_del(&sdata->u.vlan.list);
 327         return res;
 328 }
 329
 330 static int ieee80211_stop(struct net_device *dev)
 331 {
 332         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 333         struct ieee80211_local *local = sdata->local;
 334         struct ieee80211_if_init_conf conf;
 335         struct sta_info *sta;
 336         unsigned long flags;
 337         struct sk_buff *skb, *tmp;
 338         u32 hw_reconf_flags = 0;
 339         int i;
 340
 341         /*
 342          * Stop TX on this interface first.
 343          */
 344         netif_tx_stop_all_queues(dev);
 345
 346         /*
 347          * Now delete all active aggregation sessions.
 348          */
 349         rcu_read_lock();
 350
 351         list_for_each_entry_rcu(sta, &local->sta_list, list) {
 352                 if (sta->sdata == sdata)
 353                         ieee80211_sta_tear_down_BA_sessions(sta);
 354         }
 355
 356         rcu_read_unlock();
 357
 358         /*
 359          * Remove all stations associated with this interface.
 360          *
 361          * This must be done before calling ops->remove_interface()
 362          * because otherwise we can later invoke ops->sta_notify()
 363          * whenever the STAs are removed, and that invalidates driver
 364          * assumptions about always getting a vif pointer that is valid
 365          * (because if we remove a STA after ops->remove_interface()
 366          * the driver will have removed the vif info already!)
 367          *
 368          * We could relax this and only unlink the stations from the
 369          * hash table and list but keep them on a per-sdata list that
 370          * will be inserted back again when the interface is brought
 371          * up again, but I don't currently see a use case for that,
 372          * except with WDS which gets a STA entry created when it is
 373          * brought up.
 374          */
 375         sta_info_flush(local, sdata);
 376
 377         /*
 378          * Don't count this interface for promisc/allmulti while it
 379          * is down. dev_mc_unsync() will invoke set_multicast_list
 380          * on the master interface which will sync these down to the
 381          * hardware as filter flags.
 382          */
 383         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 384                 atomic_dec(&local->iff_allmultis);
 385
 386         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 387                 atomic_dec(&local->iff_promiscs);
 388
 389         if (sdata->vif.type == NL80211_IFTYPE_AP)
 390                 local->fif_pspoll--;
 391
 392         netif_addr_lock_bh(dev);
 393         spin_lock_bh(&local->filter_lock);
 394         __dev_addr_unsync(&local->mc_list, &local->mc_count,
 395                           &dev->mc_list, &dev->mc_count);
 396         spin_unlock_bh(&local->filter_lock);
 397         netif_addr_unlock_bh(dev);
 398
 399         ieee80211_configure_filter(local);
 400
 401         del_timer_sync(&local->dynamic_ps_timer);
 402         cancel_work_sync(&local->dynamic_ps_enable_work);
 403
 404         /* APs need special treatment */
 405         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 406                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
 407                 struct beacon_data *old_beacon = sdata->u.ap.beacon;
 408
 409                 /* remove beacon */
 410                 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
 411                 synchronize_rcu();
 412                 kfree(old_beacon);
 413
 414                 /* down all dependent devices, that is VLANs */
 415                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
 416                                          u.vlan.list)
 417                         dev_close(vlan->dev);
 418                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
 419         }
 420
 421         local->open_count--;
 422
 423         switch (sdata->vif.type) {
 424         case NL80211_IFTYPE_AP_VLAN:
 425                 list_del(&sdata->u.vlan.list);
 426                 /* no need to tell driver */
 427                 break;
 428         case NL80211_IFTYPE_MONITOR:
 429                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 430                         local->cooked_mntrs--;
 431                         break;
 432                 }
 433
 434                 local->monitors--;
 435                 if (local->monitors == 0) {
 436                         local->hw.conf.flags &= ~IEEE80211_CONF_RADIOTAP;
 437                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_RADIOTAP;
 438                 }
 439
 440                 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
 441                         local->fif_fcsfail--;
 442                 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
 443                         local->fif_plcpfail--;
 444                 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL) {
 445                         local->fif_pspoll--;
 446                         local->fif_control--;
 447                 }
 448                 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
 449                         local->fif_other_bss--;
 450
 451                 ieee80211_configure_filter(local);
 452                 break;
 453         case NL80211_IFTYPE_STATION:
 454                 del_timer_sync(&sdata->u.mgd.chswitch_timer);
 455                 del_timer_sync(&sdata->u.mgd.timer);
 456                 del_timer_sync(&sdata->u.mgd.conn_mon_timer);
 457                 del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
 458                 /*
 459                  * If any of the timers fired while we waited for it, it will
 460                  * have queued its work. Now the work will be running again
 461                  * but will not rearm the timer again because it checks
 462                  * whether the interface is running, which, at this point,
 463                  * it no longer is.
 464                  */
 465                 cancel_work_sync(&sdata->u.mgd.work);
 466                 cancel_work_sync(&sdata->u.mgd.chswitch_work);
 467                 cancel_work_sync(&sdata->u.mgd.monitor_work);
 468                 cancel_work_sync(&sdata->u.mgd.beacon_loss_work);
 469
 470                 /*
 471                  * When we get here, the interface is marked down.
 472                  * Call synchronize_rcu() to wait for the RX path
 473                  * should it be using the interface and enqueuing
 474                  * frames at this very time on another CPU.
 475                  */
 476                 synchronize_rcu();
 477                 skb_queue_purge(&sdata->u.mgd.skb_queue);
 478                 /* fall through */
 479         case NL80211_IFTYPE_ADHOC:
 480                 if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 481                         del_timer_sync(&sdata->u.ibss.timer);
 482                         cancel_work_sync(&sdata->u.ibss.work);
 483                         synchronize_rcu();
 484                         skb_queue_purge(&sdata->u.ibss.skb_queue);
 485                 }
 486                 /* fall through */
 487         case NL80211_IFTYPE_MESH_POINT:
 488                 if (ieee80211_vif_is_mesh(&sdata->vif)) {
 489                         /* other_bss and allmulti are always set on mesh
 490                          * ifaces */
 491                         local->fif_other_bss--;
 492                         atomic_dec(&local->iff_allmultis);
 493
 494                         ieee80211_configure_filter(local);
 495
 496                         ieee80211_stop_mesh(sdata);
 497                 }
 498                 /* fall through */
 499         default:
 500                 if (local->scan_sdata == sdata)
 501                         ieee80211_scan_cancel(local);
 502
 503                 /*
 504                  * Disable beaconing for AP and mesh, IBSS can't
 505                  * still be joined to a network at this point.
 506                  */
 507                 if (sdata->vif.type == NL80211_IFTYPE_AP ||
 508                     sdata->vif.type == NL80211_IFTYPE_MESH_POINT) {
 509                         ieee80211_bss_info_change_notify(sdata,
 510                                 BSS_CHANGED_BEACON_ENABLED);
 511                 }
 512
 513                 conf.vif = &sdata->vif;
 514                 conf.type = sdata->vif.type;
 515                 conf.mac_addr = dev->dev_addr;
 516                 /* disable all keys for as long as this netdev is down */
 517                 ieee80211_disable_keys(sdata);
 518                 drv_remove_interface(local, &conf);
 519         }
 520
 521         sdata->bss = NULL;
 522
 523         hw_reconf_flags |= __ieee80211_recalc_idle(local);
 524
 525         ieee80211_recalc_ps(local, -1);
 526
 527         if (local->open_count == 0) {
 528                 ieee80211_clear_tx_pending(local);
 529                 ieee80211_stop_device(local);
 530
 531                 /* no reconfiguring after stop! */
 532                 hw_reconf_flags = 0;
 533         }
 534
 535         /* do after stop to avoid reconfiguring when we stop anyway */
 536         if (hw_reconf_flags)
 537                 ieee80211_hw_config(local, hw_reconf_flags);
 538
 539         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 540         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 541                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
 542                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 543                         if (info->control.vif == &sdata->vif) {
 544                                 __skb_unlink(skb, &local->pending[i]);
 545                                 dev_kfree_skb_irq(skb);
 546                         }
 547                 }
 548         }
 549         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 550
 551         return 0;
 552 }
 553
 554 static void ieee80211_set_multicast_list(struct net_device *dev)
 555 {
 556         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 557         struct ieee80211_local *local = sdata->local;
 558         int allmulti, promisc, sdata_allmulti, sdata_promisc;
 559
 560         allmulti = !!(dev->flags & IFF_ALLMULTI);
 561         promisc = !!(dev->flags & IFF_PROMISC);
 562         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
 563         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
 564
 565         if (allmulti != sdata_allmulti) {
 566                 if (dev->flags & IFF_ALLMULTI)
 567                         atomic_inc(&local->iff_allmultis);
 568                 else
 569                         atomic_dec(&local->iff_allmultis);
 570                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
 571         }
 572
 573         if (promisc != sdata_promisc) {
 574                 if (dev->flags & IFF_PROMISC)
 575                         atomic_inc(&local->iff_promiscs);
 576                 else
 577                         atomic_dec(&local->iff_promiscs);
 578                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
 579         }
 580         spin_lock_bh(&local->filter_lock);
 581         __dev_addr_sync(&local->mc_list, &local->mc_count,
 582                         &dev->mc_list, &dev->mc_count);
 583         spin_unlock_bh(&local->filter_lock);
 584         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
 585 }
 586
 587 /*
 588  * Called when the netdev is removed or, by the code below, before
 589  * the interface type changes.
 590  */
 591 static void ieee80211_teardown_sdata(struct net_device *dev)
 592 {
 593         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 594         struct ieee80211_local *local = sdata->local;
 595         struct beacon_data *beacon;
 596         struct sk_buff *skb;
 597         int flushed;
 598         int i;
 599
 600         /* free extra data */
 601         ieee80211_free_keys(sdata);
 602
 603         ieee80211_debugfs_remove_netdev(sdata);
 604
 605         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
 606                 __skb_queue_purge(&sdata->fragments[i].skb_list);
 607         sdata->fragment_next = 0;
 608
 609         switch (sdata->vif.type) {
 610         case NL80211_IFTYPE_AP:
 611                 beacon = sdata->u.ap.beacon;
 612                 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
 613                 synchronize_rcu();
 614                 kfree(beacon);
 615
 616                 while ((skb = skb_dequeue(&sdata->u.ap.ps_bc_buf))) {
 617                         local->total_ps_buffered--;
 618                         dev_kfree_skb(skb);
 619                 }
 620
 621                 break;
 622         case NL80211_IFTYPE_MESH_POINT:
 623                 if (ieee80211_vif_is_mesh(&sdata->vif))
 624                         mesh_rmc_free(sdata);
 625                 break;
 626         case NL80211_IFTYPE_ADHOC:
 627                 if (WARN_ON(sdata->u.ibss.presp))
 628                         kfree_skb(sdata->u.ibss.presp);
 629                 break;
 630         case NL80211_IFTYPE_STATION:
 631         case NL80211_IFTYPE_WDS:
 632         case NL80211_IFTYPE_AP_VLAN:
 633         case NL80211_IFTYPE_MONITOR:
 634                 break;
 635         case NL80211_IFTYPE_UNSPECIFIED:
 636         case __NL80211_IFTYPE_AFTER_LAST:
 637                 BUG();
 638                 break;
 639         }
 640
 641         flushed = sta_info_flush(local, sdata);
 642         WARN_ON(flushed);
 643 }
 644
 645 static const struct net_device_ops ieee80211_dataif_ops = {
 646         .ndo_open               = ieee80211_open,
 647         .ndo_stop               = ieee80211_stop,
 648         .ndo_uninit             = ieee80211_teardown_sdata,
 649         .ndo_start_xmit         = ieee80211_subif_start_xmit,
 650         .ndo_set_multicast_list = ieee80211_set_multicast_list,
 651         .ndo_change_mtu         = ieee80211_change_mtu,
 652         .ndo_set_mac_address    = eth_mac_addr,
 653 };
 654
 655 static const struct net_device_ops ieee80211_monitorif_ops = {
 656         .ndo_open               = ieee80211_open,
 657         .ndo_stop               = ieee80211_stop,
 658         .ndo_uninit             = ieee80211_teardown_sdata,
 659         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
 660         .ndo_set_multicast_list = ieee80211_set_multicast_list,
 661         .ndo_change_mtu         = ieee80211_change_mtu,
 662         .ndo_set_mac_address    = eth_mac_addr,
 663 };
 664
 665 static void ieee80211_if_setup(struct net_device *dev)
 666 {
 667         ether_setup(dev);
 668         dev->netdev_ops = &ieee80211_dataif_ops;
 669         dev->destructor = free_netdev;
 670 }
 671
 672 /*
 673  * Helper function to initialise an interface to a specific type.
 674  */
 675 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
 676                                   enum nl80211_iftype type)
 677 {
 678         /* clear type-dependent union */
 679         memset(&sdata->u, 0, sizeof(sdata->u));
 680
 681         /* and set some type-dependent values */
 682         sdata->vif.type = type;
 683         sdata->dev->netdev_ops = &ieee80211_dataif_ops;
 684         sdata->wdev.iftype = type;
 685
 686         /* only monitor differs */
 687         sdata->dev->type = ARPHRD_ETHER;
 688
 689         switch (type) {
 690         case NL80211_IFTYPE_AP:
 691                 skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
 692                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
 693                 break;
 694         case NL80211_IFTYPE_STATION:
 695                 ieee80211_sta_setup_sdata(sdata);
 696                 break;
 697         case NL80211_IFTYPE_ADHOC:
 698                 ieee80211_ibss_setup_sdata(sdata);
 699                 break;
 700         case NL80211_IFTYPE_MESH_POINT:
 701                 if (ieee80211_vif_is_mesh(&sdata->vif))
 702                         ieee80211_mesh_init_sdata(sdata);
 703                 break;
 704         case NL80211_IFTYPE_MONITOR:
 705                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
 706                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
 707                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
 708                                       MONITOR_FLAG_OTHER_BSS;
 709                 break;
 710         case NL80211_IFTYPE_WDS:
 711         case NL80211_IFTYPE_AP_VLAN:
 712                 break;
 713         case NL80211_IFTYPE_UNSPECIFIED:
 714         case __NL80211_IFTYPE_AFTER_LAST:
 715                 BUG();
 716                 break;
 717         }
 718
 719         ieee80211_debugfs_add_netdev(sdata);
 720 }
 721
 722 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
 723                              enum nl80211_iftype type)
 724 {
 725         ASSERT_RTNL();
 726
 727         if (type == sdata->vif.type)
 728                 return 0;
 729
 730         /* Setting ad-hoc mode on non-IBSS channel is not supported. */
 731         if (sdata->local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS &&
 732             type == NL80211_IFTYPE_ADHOC)
 733                 return -EOPNOTSUPP;
 734
 735         /*
 736          * We could, here, on changes between IBSS/STA/MESH modes,
 737          * invoke an MLME function instead that disassociates etc.
 738          * and goes into the requested mode.
 739          */
 740
 741         if (netif_running(sdata->dev))
 742                 return -EBUSY;
 743
 744         /* Purge and reset type-dependent state. */
 745         ieee80211_teardown_sdata(sdata->dev);
 746         ieee80211_setup_sdata(sdata, type);
 747
 748         /* reset some values that shouldn't be kept across type changes */
 749         sdata->vif.bss_conf.basic_rates =
 750                 ieee80211_mandatory_rates(sdata->local,
 751                         sdata->local->hw.conf.channel->band);
 752         sdata->drop_unencrypted = 0;
 753
 754         return 0;
 755 }
 756
 757 static struct device_type wiphy_type = {
 758         .name   = "wlan",
 759 };
 760
 761 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
 762                      struct net_device **new_dev, enum nl80211_iftype type,
 763                      struct vif_params *params)
 764 {
 765         struct net_device *ndev;
 766         struct ieee80211_sub_if_data *sdata = NULL;
 767         int ret, i;
 768
 769         ASSERT_RTNL();
 770
 771         ndev = alloc_netdev(sizeof(*sdata) + local->hw.vif_data_size,
 772                             name, ieee80211_if_setup);
 773         if (!ndev)
 774                 return -ENOMEM;
 775         dev_net_set(ndev, wiphy_net(local->hw.wiphy));
 776
 777         ndev->needed_headroom = local->tx_headroom +
 778                                 4*6 /* four MAC addresses */
 779                                 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
 780                                 + 6 /* mesh */
 781                                 + 8 /* rfc1042/bridge tunnel */
 782                                 - ETH_HLEN /* ethernet hard_header_len */
 783                                 + IEEE80211_ENCRYPT_HEADROOM;
 784         ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
 785
 786         ret = dev_alloc_name(ndev, ndev->name);
 787         if (ret < 0)
 788                 goto fail;
 789
 790         memcpy(ndev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
 791         SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
 792         SET_NETDEV_DEVTYPE(ndev, &wiphy_type);
 793
 794         /* don't use IEEE80211_DEV_TO_SUB_IF because it checks too much */
 795         sdata = netdev_priv(ndev);
 796         ndev->ieee80211_ptr = &sdata->wdev;
 797
 798         /* initialise type-independent data */
 799         sdata->wdev.wiphy = local->hw.wiphy;
 800         sdata->local = local;
 801         sdata->dev = ndev;
 802
 803         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
 804                 skb_queue_head_init(&sdata->fragments[i].skb_list);
 805
 806         INIT_LIST_HEAD(&sdata->key_list);
 807
 808         sdata->force_unicast_rateidx = -1;
 809         sdata->max_ratectrl_rateidx = -1;
 810
 811         /* setup type-dependent data */
 812         ieee80211_setup_sdata(sdata, type);
 813
 814         ret = register_netdevice(ndev);
 815         if (ret)
 816                 goto fail;
 817
 818         if (ieee80211_vif_is_mesh(&sdata->vif) &&
 819             params && params->mesh_id_len)
 820                 ieee80211_sdata_set_mesh_id(sdata,
 821                                             params->mesh_id_len,
 822                                             params->mesh_id);
 823
 824         mutex_lock(&local->iflist_mtx);
 825         list_add_tail_rcu(&sdata->list, &local->interfaces);
 826         mutex_unlock(&local->iflist_mtx);
 827
 828         if (new_dev)
 829                 *new_dev = ndev;
 830
 831         return 0;
 832
 833  fail:
 834         free_netdev(ndev);
 835         return ret;
 836 }
 837
 838 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
 839 {
 840         ASSERT_RTNL();
 841
 842         mutex_lock(&sdata->local->iflist_mtx);
 843         list_del_rcu(&sdata->list);
 844         mutex_unlock(&sdata->local->iflist_mtx);
 845
 846         synchronize_rcu();
 847         unregister_netdevice(sdata->dev);
 848 }
 849
 850 /*
 851  * Remove all interfaces, may only be called at hardware unregistration
 852  * time because it doesn't do RCU-safe list removals.
 853  */
 854 void ieee80211_remove_interfaces(struct ieee80211_local *local)
 855 {
 856         struct ieee80211_sub_if_data *sdata, *tmp;
 857
 858         ASSERT_RTNL();
 859
 860         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
 861                 /*
 862                  * we cannot hold the iflist_mtx across unregister_netdevice,
 863                  * but we only need to hold it for list modifications to lock
 864                  * out readers since we're under the RTNL here as all other
 865                  * writers.
 866                  */
 867                 mutex_lock(&local->iflist_mtx);
 868                 list_del(&sdata->list);
 869                 mutex_unlock(&local->iflist_mtx);
 870
 871                 unregister_netdevice(sdata->dev);
 872         }
 873 }
 874
 875 static u32 ieee80211_idle_off(struct ieee80211_local *local,
 876                               const char *reason)
 877 {
 878         if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
 879                 return 0;
 880
 881 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 882         printk(KERN_DEBUG "%s: device no longer idle - %s\n",
 883                wiphy_name(local->hw.wiphy), reason);
 884 #endif
 885
 886         local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
 887         return IEEE80211_CONF_CHANGE_IDLE;
 888 }
 889
 890 static u32 ieee80211_idle_on(struct ieee80211_local *local)
 891 {
 892         if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
 893                 return 0;
 894
 895 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 896         printk(KERN_DEBUG "%s: device now idle\n",
 897                wiphy_name(local->hw.wiphy));
 898 #endif
 899
 900         local->hw.conf.flags |= IEEE80211_CONF_IDLE;
 901         return IEEE80211_CONF_CHANGE_IDLE;
 902 }
 903
 904 u32 __ieee80211_recalc_idle(struct ieee80211_local *local)
 905 {
 906         struct ieee80211_sub_if_data *sdata;
 907         int count = 0;
 908
 909         if (local->scanning)
 910                 return ieee80211_idle_off(local, "scanning");
 911
 912         list_for_each_entry(sdata, &local->interfaces, list) {
 913                 if (!netif_running(sdata->dev))
 914                         continue;
 915                 /* do not count disabled managed interfaces */
 916                 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
 917                     !sdata->u.mgd.associated &&
 918                     list_empty(&sdata->u.mgd.work_list))
 919                         continue;
 920                 /* do not count unused IBSS interfaces */
 921                 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
 922                     !sdata->u.ibss.ssid_len)
 923                         continue;
 924                 /* count everything else */
 925                 count++;
 926         }
 927
 928         if (!count)
 929                 return ieee80211_idle_on(local);
 930         else
 931                 return ieee80211_idle_off(local, "in use");
 932
 933         return 0;
 934 }
 935
 936 void ieee80211_recalc_idle(struct ieee80211_local *local)
 937 {
 938         u32 chg;
 939
 940         mutex_lock(&local->iflist_mtx);
 941         chg = __ieee80211_recalc_idle(local);
 942         mutex_unlock(&local->iflist_mtx);
 943         if (chg)
 944                 ieee80211_hw_config(local, chg);
 945 }