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   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
  24 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
  25 {
  26         int meshhdrlen;
  27         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
  28
  29         meshhdrlen = (sdata->vif.type == NL80211_IFTYPE_MESH_POINT) ? 5 : 0;
  30
  31         /* FIX: what would be proper limits for MTU?
  32          * This interface uses 802.3 frames. */
  33         if (new_mtu < 256 ||
  34             new_mtu > IEEE80211_MAX_DATA_LEN - 24 - 6 - meshhdrlen) {
  35                 return -EINVAL;
  36         }
  37
  38 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
  39         printk(KERN_DEBUG "%s: setting MTU %d\n", dev->name, new_mtu);
  40 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
  41         dev->mtu = new_mtu;
  42         return 0;
  43 }
  44
  45 static inline int identical_mac_addr_allowed(int type1, int type2)
  46 {
  47         return type1 == NL80211_IFTYPE_MONITOR ||
  48                 type2 == NL80211_IFTYPE_MONITOR ||
  49                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
  50                 (type1 == NL80211_IFTYPE_WDS &&
  51                         (type2 == NL80211_IFTYPE_WDS ||
  52                          type2 == NL80211_IFTYPE_AP)) ||
  53                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
  54                 (type1 == NL80211_IFTYPE_AP_VLAN &&
  55                         (type2 == NL80211_IFTYPE_AP ||
  56                          type2 == NL80211_IFTYPE_AP_VLAN));
  57 }
  58
  59 static int ieee80211_open(struct net_device *dev)
  60 {
  61         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
  62         struct ieee80211_sub_if_data *nsdata;
  63         struct ieee80211_local *local = sdata->local;
  64         struct sta_info *sta;
  65         struct ieee80211_if_init_conf conf;
  66         u32 changed = 0;
  67         int res;
  68         u32 hw_reconf_flags = 0;
  69         u8 null_addr[ETH_ALEN] = {0};
  70
  71         /* fail early if user set an invalid address */
  72         if (compare_ether_addr(dev->dev_addr, null_addr) &&
  73             !is_valid_ether_addr(dev->dev_addr))
  74                 return -EADDRNOTAVAIL;
  75
  76         /* we hold the RTNL here so can safely walk the list */
  77         list_for_each_entry(nsdata, &local->interfaces, list) {
  78                 struct net_device *ndev = nsdata->dev;
  79
  80                 if (ndev != dev && netif_running(ndev)) {
  81                         /*
  82                          * Allow only a single IBSS interface to be up at any
  83                          * time. This is restricted because beacon distribution
  84                          * cannot work properly if both are in the same IBSS.
  85                          *
  86                          * To remove this restriction we'd have to disallow them
  87                          * from setting the same SSID on different IBSS interfaces
  88                          * belonging to the same hardware. Then, however, we're
  89                          * faced with having to adopt two different TSF timers...
  90                          */
  91                         if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
  92                             nsdata->vif.type == NL80211_IFTYPE_ADHOC)
  93                                 return -EBUSY;
  94
  95                         /*
  96                          * The remaining checks are only performed for interfaces
  97                          * with the same MAC address.
  98                          */
  99                         if (compare_ether_addr(dev->dev_addr, ndev->dev_addr))
 100                                 continue;
 101
 102                         /*
 103                          * check whether it may have the same address
 104                          */
 105                         if (!identical_mac_addr_allowed(sdata->vif.type,
 106                                                         nsdata->vif.type))
 107                                 return -ENOTUNIQ;
 108
 109                         /*
 110                          * can only add VLANs to enabled APs
 111                          */
 112                         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
 113                             nsdata->vif.type == NL80211_IFTYPE_AP)
 114                                 sdata->bss = &nsdata->u.ap;
 115                 }
 116         }
 117
 118         switch (sdata->vif.type) {
 119         case NL80211_IFTYPE_WDS:
 120                 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
 121                         return -ENOLINK;
 122                 break;
 123         case NL80211_IFTYPE_AP_VLAN:
 124                 if (!sdata->bss)
 125                         return -ENOLINK;
 126                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
 127                 break;
 128         case NL80211_IFTYPE_AP:
 129                 sdata->bss = &sdata->u.ap;
 130                 break;
 131         case NL80211_IFTYPE_MESH_POINT:
 132                 if (!ieee80211_vif_is_mesh(&sdata->vif))
 133                         break;
 134                 /* mesh ifaces must set allmulti to forward mcast traffic */
 135                 atomic_inc(&local->iff_allmultis);
 136                 break;
 137         case NL80211_IFTYPE_STATION:
 138         case NL80211_IFTYPE_MONITOR:
 139         case NL80211_IFTYPE_ADHOC:
 140                 /* no special treatment */
 141                 break;
 142         case NL80211_IFTYPE_UNSPECIFIED:
 143         case __NL80211_IFTYPE_AFTER_LAST:
 144                 /* cannot happen */
 145                 WARN_ON(1);
 146                 break;
 147         }
 148
 149         if (local->open_count == 0) {
 150                 res = 0;
 151                 if (local->ops->start)
 152                         res = local->ops->start(local_to_hw(local));
 153                 if (res)
 154                         goto err_del_bss;
 155                 /* we're brought up, everything changes */
 156                 hw_reconf_flags = ~0;
 157                 ieee80211_led_radio(local, local->hw.conf.radio_enabled);
 158         }
 159
 160         /*
 161          * Check all interfaces and copy the hopefully now-present
 162          * MAC address to those that have the special null one.
 163          */
 164         list_for_each_entry(nsdata, &local->interfaces, list) {
 165                 struct net_device *ndev = nsdata->dev;
 166
 167                 /*
 168                  * No need to check netif_running since we do not allow
 169                  * it to start up with this invalid address.
 170                  */
 171                 if (compare_ether_addr(null_addr, ndev->dev_addr) == 0)
 172                         memcpy(ndev->dev_addr,
 173                                local->hw.wiphy->perm_addr,
 174                                ETH_ALEN);
 175         }
 176
 177         if (compare_ether_addr(null_addr, local->mdev->dev_addr) == 0)
 178                 memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr,
 179                        ETH_ALEN);
 180
 181         /*
 182          * Validate the MAC address for this device.
 183          */
 184         if (!is_valid_ether_addr(dev->dev_addr)) {
 185                 if (!local->open_count && local->ops->stop)
 186                         local->ops->stop(local_to_hw(local));
 187                 return -EADDRNOTAVAIL;
 188         }
 189
 190         switch (sdata->vif.type) {
 191         case NL80211_IFTYPE_AP_VLAN:
 192                 /* no need to tell driver */
 193                 break;
 194         case NL80211_IFTYPE_MONITOR:
 195                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 196                         local->cooked_mntrs++;
 197                         break;
 198                 }
 199
 200                 /* must be before the call to ieee80211_configure_filter */
 201                 local->monitors++;
 202                 if (local->monitors == 1) {
 203                         local->hw.conf.flags |= IEEE80211_CONF_RADIOTAP;
 204                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_RADIOTAP;
 205                 }
 206
 207                 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
 208                         local->fif_fcsfail++;
 209                 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
 210                         local->fif_plcpfail++;
 211                 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL)
 212                         local->fif_control++;
 213                 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
 214                         local->fif_other_bss++;
 215
 216                 netif_addr_lock_bh(local->mdev);
 217                 ieee80211_configure_filter(local);
 218                 netif_addr_unlock_bh(local->mdev);
 219                 break;
 220         case NL80211_IFTYPE_STATION:
 221         case NL80211_IFTYPE_ADHOC:
 222                 sdata->u.sta.flags &= ~IEEE80211_STA_PREV_BSSID_SET;
 223                 /* fall through */
 224         default:
 225                 conf.vif = &sdata->vif;
 226                 conf.type = sdata->vif.type;
 227                 conf.mac_addr = dev->dev_addr;
 228                 res = local->ops->add_interface(local_to_hw(local), &conf);
 229                 if (res)
 230                         goto err_stop;
 231
 232                 if (ieee80211_vif_is_mesh(&sdata->vif))
 233                         ieee80211_start_mesh(sdata);
 234                 changed |= ieee80211_reset_erp_info(sdata);
 235                 ieee80211_bss_info_change_notify(sdata, changed);
 236                 ieee80211_enable_keys(sdata);
 237
 238                 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
 239                     !(sdata->flags & IEEE80211_SDATA_USERSPACE_MLME))
 240                         netif_carrier_off(dev);
 241                 else
 242                         netif_carrier_on(dev);
 243         }
 244
 245         if (sdata->vif.type == NL80211_IFTYPE_WDS) {
 246                 /* Create STA entry for the WDS peer */
 247                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
 248                                      GFP_KERNEL);
 249                 if (!sta) {
 250                         res = -ENOMEM;
 251                         goto err_del_interface;
 252                 }
 253
 254                 /* no locking required since STA is not live yet */
 255                 sta->flags |= WLAN_STA_AUTHORIZED;
 256
 257                 res = sta_info_insert(sta);
 258                 if (res) {
 259                         /* STA has been freed */
 260                         goto err_del_interface;
 261                 }
 262         }
 263
 264         if (local->open_count == 0) {
 265                 res = dev_open(local->mdev);
 266                 WARN_ON(res);
 267                 if (res)
 268                         goto err_del_interface;
 269                 tasklet_enable(&local->tx_pending_tasklet);
 270                 tasklet_enable(&local->tasklet);
 271         }
 272
 273         /*
 274          * set_multicast_list will be invoked by the networking core
 275          * which will check whether any increments here were done in
 276          * error and sync them down to the hardware as filter flags.
 277          */
 278         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 279                 atomic_inc(&local->iff_allmultis);
 280
 281         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 282                 atomic_inc(&local->iff_promiscs);
 283
 284         local->open_count++;
 285         if (hw_reconf_flags) {
 286                 ieee80211_hw_config(local, hw_reconf_flags);
 287                 /*
 288                  * set default queue parameters so drivers don't
 289                  * need to initialise the hardware if the hardware
 290                  * doesn't start up with sane defaults
 291                  */
 292                 ieee80211_set_wmm_default(sdata);
 293         }
 294
 295         /*
 296          * ieee80211_sta_work is disabled while network interface
 297          * is down. Therefore, some configuration changes may not
 298          * yet be effective. Trigger execution of ieee80211_sta_work
 299          * to fix this.
 300          */
 301         if (sdata->vif.type == NL80211_IFTYPE_STATION ||
 302             sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 303                 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
 304                 queue_work(local->hw.workqueue, &ifsta->work);
 305         }
 306
 307         netif_tx_start_all_queues(dev);
 308
 309         return 0;
 310  err_del_interface:
 311         local->ops->remove_interface(local_to_hw(local), &conf);
 312  err_stop:
 313         if (!local->open_count && local->ops->stop)
 314                 local->ops->stop(local_to_hw(local));
 315  err_del_bss:
 316         sdata->bss = NULL;
 317         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
 318                 list_del(&sdata->u.vlan.list);
 319         return res;
 320 }
 321
 322 static int ieee80211_stop(struct net_device *dev)
 323 {
 324         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 325         struct ieee80211_local *local = sdata->local;
 326         struct ieee80211_if_init_conf conf;
 327         struct sta_info *sta;
 328         u32 hw_reconf_flags = 0;
 329
 330         /*
 331          * Stop TX on this interface first.
 332          */
 333         netif_tx_stop_all_queues(dev);
 334
 335         /*
 336          * Now delete all active aggregation sessions.
 337          */
 338         rcu_read_lock();
 339
 340         list_for_each_entry_rcu(sta, &local->sta_list, list) {
 341                 if (sta->sdata == sdata)
 342                         ieee80211_sta_tear_down_BA_sessions(sdata,
 343                                                             sta->sta.addr);
 344         }
 345
 346         rcu_read_unlock();
 347
 348         /*
 349          * Remove all stations associated with this interface.
 350          *
 351          * This must be done before calling ops->remove_interface()
 352          * because otherwise we can later invoke ops->sta_notify()
 353          * whenever the STAs are removed, and that invalidates driver
 354          * assumptions about always getting a vif pointer that is valid
 355          * (because if we remove a STA after ops->remove_interface()
 356          * the driver will have removed the vif info already!)
 357          *
 358          * We could relax this and only unlink the stations from the
 359          * hash table and list but keep them on a per-sdata list that
 360          * will be inserted back again when the interface is brought
 361          * up again, but I don't currently see a use case for that,
 362          * except with WDS which gets a STA entry created when it is
 363          * brought up.
 364          */
 365         sta_info_flush(local, sdata);
 366
 367         /*
 368          * Don't count this interface for promisc/allmulti while it
 369          * is down. dev_mc_unsync() will invoke set_multicast_list
 370          * on the master interface which will sync these down to the
 371          * hardware as filter flags.
 372          */
 373         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 374                 atomic_dec(&local->iff_allmultis);
 375
 376         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 377                 atomic_dec(&local->iff_promiscs);
 378
 379         dev_mc_unsync(local->mdev, dev);
 380
 381         /* APs need special treatment */
 382         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 383                 struct ieee80211_sub_if_data *vlan, *tmp;
 384                 struct beacon_data *old_beacon = sdata->u.ap.beacon;
 385
 386                 /* remove beacon */
 387                 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
 388                 synchronize_rcu();
 389                 kfree(old_beacon);
 390
 391                 /* down all dependent devices, that is VLANs */
 392                 list_for_each_entry_safe(vlan, tmp, &sdata->u.ap.vlans,
 393                                          u.vlan.list)
 394                         dev_close(vlan->dev);
 395                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
 396         }
 397
 398         local->open_count--;
 399
 400         switch (sdata->vif.type) {
 401         case NL80211_IFTYPE_AP_VLAN:
 402                 list_del(&sdata->u.vlan.list);
 403                 /* no need to tell driver */
 404                 break;
 405         case NL80211_IFTYPE_MONITOR:
 406                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 407                         local->cooked_mntrs--;
 408                         break;
 409                 }
 410
 411                 local->monitors--;
 412                 if (local->monitors == 0) {
 413                         local->hw.conf.flags &= ~IEEE80211_CONF_RADIOTAP;
 414                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_RADIOTAP;
 415                 }
 416
 417                 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
 418                         local->fif_fcsfail--;
 419                 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
 420                         local->fif_plcpfail--;
 421                 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL)
 422                         local->fif_control--;
 423                 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
 424                         local->fif_other_bss--;
 425
 426                 netif_addr_lock_bh(local->mdev);
 427                 ieee80211_configure_filter(local);
 428                 netif_addr_unlock_bh(local->mdev);
 429                 break;
 430         case NL80211_IFTYPE_STATION:
 431         case NL80211_IFTYPE_ADHOC:
 432                 sdata->u.sta.state = IEEE80211_STA_MLME_DISABLED;
 433                 memset(sdata->u.sta.bssid, 0, ETH_ALEN);
 434                 del_timer_sync(&sdata->u.sta.timer);
 435                 /*
 436                  * If the timer fired while we waited for it, it will have
 437                  * requeued the work. Now the work will be running again
 438                  * but will not rearm the timer again because it checks
 439                  * whether the interface is running, which, at this point,
 440                  * it no longer is.
 441                  */
 442                 cancel_work_sync(&sdata->u.sta.work);
 443                 /*
 444                  * When we get here, the interface is marked down.
 445                  * Call synchronize_rcu() to wait for the RX path
 446                  * should it be using the interface and enqueuing
 447                  * frames at this very time on another CPU.
 448                  */
 449                 synchronize_rcu();
 450                 skb_queue_purge(&sdata->u.sta.skb_queue);
 451
 452                 sdata->u.sta.flags &= ~IEEE80211_STA_PRIVACY_INVOKED;
 453                 kfree(sdata->u.sta.extra_ie);
 454                 sdata->u.sta.extra_ie = NULL;
 455                 sdata->u.sta.extra_ie_len = 0;
 456                 /* fall through */
 457         case NL80211_IFTYPE_MESH_POINT:
 458                 if (ieee80211_vif_is_mesh(&sdata->vif)) {
 459                         /* allmulti is always set on mesh ifaces */
 460                         atomic_dec(&local->iff_allmultis);
 461                         ieee80211_stop_mesh(sdata);
 462                 }
 463                 /* fall through */
 464         default:
 465                 if (local->scan_sdata == sdata) {
 466                         if (!local->ops->hw_scan)
 467                                 cancel_delayed_work_sync(&local->scan_work);
 468                         /*
 469                          * The software scan can no longer run now, so we can
 470                          * clear out the scan_sdata reference. However, the
 471                          * hardware scan may still be running. The complete
 472                          * function must be prepared to handle a NULL value.
 473                          */
 474                         local->scan_sdata = NULL;
 475                         /*
 476                          * The memory barrier guarantees that another CPU
 477                          * that is hardware-scanning will now see the fact
 478                          * that this interface is gone.
 479                          */
 480                         smp_mb();
 481                         /*
 482                          * If software scanning, complete the scan but since
 483                          * the scan_sdata is NULL already don't send out a
 484                          * scan event to userspace -- the scan is incomplete.
 485                          */
 486                         if (local->sw_scanning)
 487                                 ieee80211_scan_completed(&local->hw);
 488                 }
 489
 490                 conf.vif = &sdata->vif;
 491                 conf.type = sdata->vif.type;
 492                 conf.mac_addr = dev->dev_addr;
 493                 /* disable all keys for as long as this netdev is down */
 494                 ieee80211_disable_keys(sdata);
 495                 local->ops->remove_interface(local_to_hw(local), &conf);
 496         }
 497
 498         sdata->bss = NULL;
 499
 500         if (local->open_count == 0) {
 501                 if (netif_running(local->mdev))
 502                         dev_close(local->mdev);
 503
 504                 if (local->ops->stop)
 505                         local->ops->stop(local_to_hw(local));
 506
 507                 ieee80211_led_radio(local, 0);
 508
 509                 flush_workqueue(local->hw.workqueue);
 510
 511                 tasklet_disable(&local->tx_pending_tasklet);
 512                 tasklet_disable(&local->tasklet);
 513
 514                 /* no reconfiguring after stop! */
 515                 hw_reconf_flags = 0;
 516         }
 517
 518         /* do after stop to avoid reconfiguring when we stop anyway */
 519         if (hw_reconf_flags)
 520                 ieee80211_hw_config(local, hw_reconf_flags);
 521
 522         return 0;
 523 }
 524
 525 static void ieee80211_set_multicast_list(struct net_device *dev)
 526 {
 527         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 528         struct ieee80211_local *local = sdata->local;
 529         int allmulti, promisc, sdata_allmulti, sdata_promisc;
 530
 531         allmulti = !!(dev->flags & IFF_ALLMULTI);
 532         promisc = !!(dev->flags & IFF_PROMISC);
 533         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
 534         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
 535
 536         if (allmulti != sdata_allmulti) {
 537                 if (dev->flags & IFF_ALLMULTI)
 538                         atomic_inc(&local->iff_allmultis);
 539                 else
 540                         atomic_dec(&local->iff_allmultis);
 541                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
 542         }
 543
 544         if (promisc != sdata_promisc) {
 545                 if (dev->flags & IFF_PROMISC)
 546                         atomic_inc(&local->iff_promiscs);
 547                 else
 548                         atomic_dec(&local->iff_promiscs);
 549                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
 550         }
 551
 552         dev_mc_sync(local->mdev, dev);
 553 }
 554
 555 static void ieee80211_if_setup(struct net_device *dev)
 556 {
 557         ether_setup(dev);
 558         dev->hard_start_xmit = ieee80211_subif_start_xmit;
 559         dev->wireless_handlers = &ieee80211_iw_handler_def;
 560         dev->set_multicast_list = ieee80211_set_multicast_list;
 561         dev->change_mtu = ieee80211_change_mtu;
 562         dev->open = ieee80211_open;
 563         dev->stop = ieee80211_stop;
 564         dev->destructor = free_netdev;
 565         /* we will validate the address ourselves in ->open */
 566         dev->validate_addr = NULL;
 567 }
 568 /*
 569  * Called when the netdev is removed or, by the code below, before
 570  * the interface type changes.
 571  */
 572 static void ieee80211_teardown_sdata(struct net_device *dev)
 573 {
 574         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 575         struct ieee80211_local *local = sdata->local;
 576         struct beacon_data *beacon;
 577         struct sk_buff *skb;
 578         int flushed;
 579         int i;
 580
 581         /* free extra data */
 582         ieee80211_free_keys(sdata);
 583
 584         ieee80211_debugfs_remove_netdev(sdata);
 585
 586         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
 587                 __skb_queue_purge(&sdata->fragments[i].skb_list);
 588         sdata->fragment_next = 0;
 589
 590         switch (sdata->vif.type) {
 591         case NL80211_IFTYPE_AP:
 592                 beacon = sdata->u.ap.beacon;
 593                 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
 594                 synchronize_rcu();
 595                 kfree(beacon);
 596
 597                 while ((skb = skb_dequeue(&sdata->u.ap.ps_bc_buf))) {
 598                         local->total_ps_buffered--;
 599                         dev_kfree_skb(skb);
 600                 }
 601
 602                 break;
 603         case NL80211_IFTYPE_MESH_POINT:
 604                 if (ieee80211_vif_is_mesh(&sdata->vif))
 605                         mesh_rmc_free(sdata);
 606                 break;
 607         case NL80211_IFTYPE_STATION:
 608         case NL80211_IFTYPE_ADHOC:
 609                 kfree(sdata->u.sta.extra_ie);
 610                 kfree(sdata->u.sta.assocreq_ies);
 611                 kfree(sdata->u.sta.assocresp_ies);
 612                 kfree_skb(sdata->u.sta.probe_resp);
 613                 break;
 614         case NL80211_IFTYPE_WDS:
 615         case NL80211_IFTYPE_AP_VLAN:
 616         case NL80211_IFTYPE_MONITOR:
 617                 break;
 618         case NL80211_IFTYPE_UNSPECIFIED:
 619         case __NL80211_IFTYPE_AFTER_LAST:
 620                 BUG();
 621                 break;
 622         }
 623
 624         flushed = sta_info_flush(local, sdata);
 625         WARN_ON(flushed);
 626 }
 627
 628 /*
 629  * Helper function to initialise an interface to a specific type.
 630  */
 631 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
 632                                   enum nl80211_iftype type)
 633 {
 634         /* clear type-dependent union */
 635         memset(&sdata->u, 0, sizeof(sdata->u));
 636
 637         /* and set some type-dependent values */
 638         sdata->vif.type = type;
 639         sdata->dev->hard_start_xmit = ieee80211_subif_start_xmit;
 640         sdata->wdev.iftype = type;
 641
 642         /* only monitor differs */
 643         sdata->dev->type = ARPHRD_ETHER;
 644
 645         switch (type) {
 646         case NL80211_IFTYPE_AP:
 647                 skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
 648                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
 649                 break;
 650         case NL80211_IFTYPE_STATION:
 651         case NL80211_IFTYPE_ADHOC:
 652                 ieee80211_sta_setup_sdata(sdata);
 653                 break;
 654         case NL80211_IFTYPE_MESH_POINT:
 655                 if (ieee80211_vif_is_mesh(&sdata->vif))
 656                         ieee80211_mesh_init_sdata(sdata);
 657                 break;
 658         case NL80211_IFTYPE_MONITOR:
 659                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
 660                 sdata->dev->hard_start_xmit = ieee80211_monitor_start_xmit;
 661                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
 662                                       MONITOR_FLAG_OTHER_BSS;
 663                 break;
 664         case NL80211_IFTYPE_WDS:
 665         case NL80211_IFTYPE_AP_VLAN:
 666                 break;
 667         case NL80211_IFTYPE_UNSPECIFIED:
 668         case __NL80211_IFTYPE_AFTER_LAST:
 669                 BUG();
 670                 break;
 671         }
 672
 673         ieee80211_debugfs_add_netdev(sdata);
 674 }
 675
 676 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
 677                              enum nl80211_iftype type)
 678 {
 679         ASSERT_RTNL();
 680
 681         if (type == sdata->vif.type)
 682                 return 0;
 683
 684         /*
 685          * We could, here, on changes between IBSS/STA/MESH modes,
 686          * invoke an MLME function instead that disassociates etc.
 687          * and goes into the requested mode.
 688          */
 689
 690         if (netif_running(sdata->dev))
 691                 return -EBUSY;
 692
 693         /* Purge and reset type-dependent state. */
 694         ieee80211_teardown_sdata(sdata->dev);
 695         ieee80211_setup_sdata(sdata, type);
 696
 697         /* reset some values that shouldn't be kept across type changes */
 698         sdata->vif.bss_conf.basic_rates =
 699                 ieee80211_mandatory_rates(sdata->local,
 700                         sdata->local->hw.conf.channel->band);
 701         sdata->drop_unencrypted = 0;
 702
 703         return 0;
 704 }
 705
 706 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
 707                      struct net_device **new_dev, enum nl80211_iftype type,
 708                      struct vif_params *params)
 709 {
 710         struct net_device *ndev;
 711         struct ieee80211_sub_if_data *sdata = NULL;
 712         int ret, i;
 713
 714         ASSERT_RTNL();
 715
 716         ndev = alloc_netdev(sizeof(*sdata) + local->hw.vif_data_size,
 717                             name, ieee80211_if_setup);
 718         if (!ndev)
 719                 return -ENOMEM;
 720
 721         ndev->needed_headroom = local->tx_headroom +
 722                                 4*6 /* four MAC addresses */
 723                                 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
 724                                 + 6 /* mesh */
 725                                 + 8 /* rfc1042/bridge tunnel */
 726                                 - ETH_HLEN /* ethernet hard_header_len */
 727                                 + IEEE80211_ENCRYPT_HEADROOM;
 728         ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
 729
 730         ret = dev_alloc_name(ndev, ndev->name);
 731         if (ret < 0)
 732                 goto fail;
 733
 734         memcpy(ndev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
 735         SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
 736
 737         /* don't use IEEE80211_DEV_TO_SUB_IF because it checks too much */
 738         sdata = netdev_priv(ndev);
 739         ndev->ieee80211_ptr = &sdata->wdev;
 740
 741         /* initialise type-independent data */
 742         sdata->wdev.wiphy = local->hw.wiphy;
 743         sdata->local = local;
 744         sdata->dev = ndev;
 745
 746         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
 747                 skb_queue_head_init(&sdata->fragments[i].skb_list);
 748
 749         INIT_LIST_HEAD(&sdata->key_list);
 750
 751         sdata->force_unicast_rateidx = -1;
 752         sdata->max_ratectrl_rateidx = -1;
 753
 754         /* setup type-dependent data */
 755         ieee80211_setup_sdata(sdata, type);
 756
 757         ret = register_netdevice(ndev);
 758         if (ret)
 759                 goto fail;
 760
 761         ndev->uninit = ieee80211_teardown_sdata;
 762
 763         if (ieee80211_vif_is_mesh(&sdata->vif) &&
 764             params && params->mesh_id_len)
 765                 ieee80211_sdata_set_mesh_id(sdata,
 766                                             params->mesh_id_len,
 767                                             params->mesh_id);
 768
 769         list_add_tail_rcu(&sdata->list, &local->interfaces);
 770
 771         if (new_dev)
 772                 *new_dev = ndev;
 773
 774         return 0;
 775
 776  fail:
 777         free_netdev(ndev);
 778         return ret;
 779 }
 780
 781 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
 782 {
 783         ASSERT_RTNL();
 784
 785         list_del_rcu(&sdata->list);
 786         synchronize_rcu();
 787         unregister_netdevice(sdata->dev);
 788 }
 789
 790 /*
 791  * Remove all interfaces, may only be called at hardware unregistration
 792  * time because it doesn't do RCU-safe list removals.
 793  */
 794 void ieee80211_remove_interfaces(struct ieee80211_local *local)
 795 {
 796         struct ieee80211_sub_if_data *sdata, *tmp;
 797
 798         ASSERT_RTNL();
 799
 800         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
 801                 list_del(&sdata->list);
 802                 unregister_netdevice(sdata->dev);
 803         }
 804 }