SAFE public projects git trees. - safe/jmp/linux-2.6/blob - 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
  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, *nsdata;
  62         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
  63         struct sta_info *sta;
  64         struct ieee80211_if_init_conf conf;
  65         u32 changed = 0;
  66         int res;
  67         bool need_hw_reconfig = 0;
  68         u8 null_addr[ETH_ALEN] = {0};
  69
  70         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
  71
  72         /* fail early if user set an invalid address */
  73         if (compare_ether_addr(dev->dev_addr, null_addr) &&
  74             !is_valid_ether_addr(dev->dev_addr))
  75                 return -EADDRNOTAVAIL;
  76
  77         /* we hold the RTNL here so can safely walk the list */
  78         list_for_each_entry(nsdata, &local->interfaces, list) {
  79                 struct net_device *ndev = nsdata->dev;
  80
  81                 if (ndev != dev && netif_running(ndev)) {
  82                         /*
  83                          * Allow only a single IBSS interface to be up at any
  84                          * time. This is restricted because beacon distribution
  85                          * cannot work properly if both are in the same IBSS.
  86                          *
  87                          * To remove this restriction we'd have to disallow them
  88                          * from setting the same SSID on different IBSS interfaces
  89                          * belonging to the same hardware. Then, however, we're
  90                          * faced with having to adopt two different TSF timers...
  91                          */
  92                         if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
  93                             nsdata->vif.type == NL80211_IFTYPE_ADHOC)
  94                                 return -EBUSY;
  95
  96                         /*
  97                          * The remaining checks are only performed for interfaces
  98                          * with the same MAC address.
  99                          */
 100                         if (compare_ether_addr(dev->dev_addr, ndev->dev_addr))
 101                                 continue;
 102
 103                         /*
 104                          * check whether it may have the same address
 105                          */
 106                         if (!identical_mac_addr_allowed(sdata->vif.type,
 107                                                         nsdata->vif.type))
 108                                 return -ENOTUNIQ;
 109
 110                         /*
 111                          * can only add VLANs to enabled APs
 112                          */
 113                         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
 114                             nsdata->vif.type == NL80211_IFTYPE_AP)
 115                                 sdata->bss = &nsdata->u.ap;
 116                 }
 117         }
 118
 119         switch (sdata->vif.type) {
 120         case NL80211_IFTYPE_WDS:
 121                 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
 122                         return -ENOLINK;
 123                 break;
 124         case NL80211_IFTYPE_AP_VLAN:
 125                 if (!sdata->bss)
 126                         return -ENOLINK;
 127                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
 128                 break;
 129         case NL80211_IFTYPE_AP:
 130                 sdata->bss = &sdata->u.ap;
 131                 break;
 132         case NL80211_IFTYPE_MESH_POINT:
 133                 if (!ieee80211_vif_is_mesh(&sdata->vif))
 134                         break;
 135                 /* mesh ifaces must set allmulti to forward mcast traffic */
 136                 atomic_inc(&local->iff_allmultis);
 137                 break;
 138         case NL80211_IFTYPE_STATION:
 139         case NL80211_IFTYPE_MONITOR:
 140         case NL80211_IFTYPE_ADHOC:
 141                 /* no special treatment */
 142                 break;
 143         case NL80211_IFTYPE_UNSPECIFIED:
 144         case __NL80211_IFTYPE_AFTER_LAST:
 145                 /* cannot happen */
 146                 WARN_ON(1);
 147                 break;
 148         }
 149
 150         if (local->open_count == 0) {
 151                 res = 0;
 152                 if (local->ops->start)
 153                         res = local->ops->start(local_to_hw(local));
 154                 if (res)
 155                         goto err_del_bss;
 156                 need_hw_reconfig = 1;
 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
 205                 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
 206                         local->fif_fcsfail++;
 207                 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
 208                         local->fif_plcpfail++;
 209                 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL)
 210                         local->fif_control++;
 211                 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
 212                         local->fif_other_bss++;
 213
 214                 netif_addr_lock_bh(local->mdev);
 215                 ieee80211_configure_filter(local);
 216                 netif_addr_unlock_bh(local->mdev);
 217                 break;
 218         case NL80211_IFTYPE_STATION:
 219         case NL80211_IFTYPE_ADHOC:
 220                 sdata->u.sta.flags &= ~IEEE80211_STA_PREV_BSSID_SET;
 221                 /* fall through */
 222         default:
 223                 conf.vif = &sdata->vif;
 224                 conf.type = sdata->vif.type;
 225                 conf.mac_addr = dev->dev_addr;
 226                 res = local->ops->add_interface(local_to_hw(local), &conf);
 227                 if (res)
 228                         goto err_stop;
 229
 230                 if (ieee80211_vif_is_mesh(&sdata->vif))
 231                         ieee80211_start_mesh(sdata);
 232                 changed |= ieee80211_reset_erp_info(sdata);
 233                 ieee80211_bss_info_change_notify(sdata, changed);
 234                 ieee80211_enable_keys(sdata);
 235
 236                 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
 237                     !(sdata->flags & IEEE80211_SDATA_USERSPACE_MLME))
 238                         netif_carrier_off(dev);
 239                 else
 240                         netif_carrier_on(dev);
 241         }
 242
 243         if (sdata->vif.type == NL80211_IFTYPE_WDS) {
 244                 /* Create STA entry for the WDS peer */
 245                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
 246                                      GFP_KERNEL);
 247                 if (!sta) {
 248                         res = -ENOMEM;
 249                         goto err_del_interface;
 250                 }
 251
 252                 /* no locking required since STA is not live yet */
 253                 sta->flags |= WLAN_STA_AUTHORIZED;
 254
 255                 res = sta_info_insert(sta);
 256                 if (res) {
 257                         /* STA has been freed */
 258                         goto err_del_interface;
 259                 }
 260         }
 261
 262         if (local->open_count == 0) {
 263                 res = dev_open(local->mdev);
 264                 WARN_ON(res);
 265                 if (res)
 266                         goto err_del_interface;
 267                 tasklet_enable(&local->tx_pending_tasklet);
 268                 tasklet_enable(&local->tasklet);
 269         }
 270
 271         /*
 272          * set_multicast_list will be invoked by the networking core
 273          * which will check whether any increments here were done in
 274          * error and sync them down to the hardware as filter flags.
 275          */
 276         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 277                 atomic_inc(&local->iff_allmultis);
 278
 279         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 280                 atomic_inc(&local->iff_promiscs);
 281
 282         local->open_count++;
 283         if (need_hw_reconfig) {
 284                 ieee80211_hw_config(local);
 285                 /*
 286                  * set default queue parameters so drivers don't
 287                  * need to initialise the hardware if the hardware
 288                  * doesn't start up with sane defaults
 289                  */
 290                 ieee80211_set_wmm_default(sdata);
 291         }
 292
 293         /*
 294          * ieee80211_sta_work is disabled while network interface
 295          * is down. Therefore, some configuration changes may not
 296          * yet be effective. Trigger execution of ieee80211_sta_work
 297          * to fix this.
 298          */
 299         if (sdata->vif.type == NL80211_IFTYPE_STATION ||
 300             sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 301                 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
 302                 queue_work(local->hw.workqueue, &ifsta->work);
 303         }
 304
 305         netif_tx_start_all_queues(dev);
 306
 307         return 0;
 308  err_del_interface:
 309         local->ops->remove_interface(local_to_hw(local), &conf);
 310  err_stop:
 311         if (!local->open_count && local->ops->stop)
 312                 local->ops->stop(local_to_hw(local));
 313  err_del_bss:
 314         sdata->bss = NULL;
 315         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
 316                 list_del(&sdata->u.vlan.list);
 317         return res;
 318 }
 319
 320 static int ieee80211_stop(struct net_device *dev)
 321 {
 322         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 323         struct ieee80211_local *local = sdata->local;
 324         struct ieee80211_if_init_conf conf;
 325         struct sta_info *sta;
 326
 327         /*
 328          * Stop TX on this interface first.
 329          */
 330         netif_tx_stop_all_queues(dev);
 331
 332         /*
 333          * Now delete all active aggregation sessions.
 334          */
 335         rcu_read_lock();
 336
 337         list_for_each_entry_rcu(sta, &local->sta_list, list) {
 338                 if (sta->sdata == sdata)
 339                         ieee80211_sta_tear_down_BA_sessions(sdata,
 340                                                             sta->sta.addr);
 341         }
 342
 343         rcu_read_unlock();
 344
 345         /*
 346          * Remove all stations associated with this interface.
 347          *
 348          * This must be done before calling ops->remove_interface()
 349          * because otherwise we can later invoke ops->sta_notify()
 350          * whenever the STAs are removed, and that invalidates driver
 351          * assumptions about always getting a vif pointer that is valid
 352          * (because if we remove a STA after ops->remove_interface()
 353          * the driver will have removed the vif info already!)
 354          *
 355          * We could relax this and only unlink the stations from the
 356          * hash table and list but keep them on a per-sdata list that
 357          * will be inserted back again when the interface is brought
 358          * up again, but I don't currently see a use case for that,
 359          * except with WDS which gets a STA entry created when it is
 360          * brought up.
 361          */
 362         sta_info_flush(local, sdata);
 363
 364         /*
 365          * Don't count this interface for promisc/allmulti while it
 366          * is down. dev_mc_unsync() will invoke set_multicast_list
 367          * on the master interface which will sync these down to the
 368          * hardware as filter flags.
 369          */
 370         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 371                 atomic_dec(&local->iff_allmultis);
 372
 373         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 374                 atomic_dec(&local->iff_promiscs);
 375
 376         dev_mc_unsync(local->mdev, dev);
 377
 378         /* APs need special treatment */
 379         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 380                 struct ieee80211_sub_if_data *vlan, *tmp;
 381                 struct beacon_data *old_beacon = sdata->u.ap.beacon;
 382
 383                 /* remove beacon */
 384                 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
 385                 synchronize_rcu();
 386                 kfree(old_beacon);
 387
 388                 /* down all dependent devices, that is VLANs */
 389                 list_for_each_entry_safe(vlan, tmp, &sdata->u.ap.vlans,
 390                                          u.vlan.list)
 391                         dev_close(vlan->dev);
 392                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
 393         }
 394
 395         local->open_count--;
 396
 397         switch (sdata->vif.type) {
 398         case NL80211_IFTYPE_AP_VLAN:
 399                 list_del(&sdata->u.vlan.list);
 400                 /* no need to tell driver */
 401                 break;
 402         case NL80211_IFTYPE_MONITOR:
 403                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 404                         local->cooked_mntrs--;
 405                         break;
 406                 }
 407
 408                 local->monitors--;
 409                 if (local->monitors == 0)
 410                         local->hw.conf.flags &= ~IEEE80211_CONF_RADIOTAP;
 411
 412                 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
 413                         local->fif_fcsfail--;
 414                 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
 415                         local->fif_plcpfail--;
 416                 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL)
 417                         local->fif_control--;
 418                 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
 419                         local->fif_other_bss--;
 420
 421                 netif_addr_lock_bh(local->mdev);
 422                 ieee80211_configure_filter(local);
 423                 netif_addr_unlock_bh(local->mdev);
 424                 break;
 425         case NL80211_IFTYPE_STATION:
 426         case NL80211_IFTYPE_ADHOC:
 427                 sdata->u.sta.state = IEEE80211_STA_MLME_DISABLED;
 428                 memset(sdata->u.sta.bssid, 0, ETH_ALEN);
 429                 del_timer_sync(&sdata->u.sta.timer);
 430                 /*
 431                  * If the timer fired while we waited for it, it will have
 432                  * requeued the work. Now the work will be running again
 433                  * but will not rearm the timer again because it checks
 434                  * whether the interface is running, which, at this point,
 435                  * it no longer is.
 436                  */
 437                 cancel_work_sync(&sdata->u.sta.work);
 438                 /*
 439                  * When we get here, the interface is marked down.
 440                  * Call synchronize_rcu() to wait for the RX path
 441                  * should it be using the interface and enqueuing
 442                  * frames at this very time on another CPU.
 443                  */
 444                 synchronize_rcu();
 445                 skb_queue_purge(&sdata->u.sta.skb_queue);
 446
 447                 sdata->u.sta.flags &= ~IEEE80211_STA_PRIVACY_INVOKED;
 448                 kfree(sdata->u.sta.extra_ie);
 449                 sdata->u.sta.extra_ie = NULL;
 450                 sdata->u.sta.extra_ie_len = 0;
 451                 /* fall through */
 452         case NL80211_IFTYPE_MESH_POINT:
 453                 if (ieee80211_vif_is_mesh(&sdata->vif)) {
 454                         /* allmulti is always set on mesh ifaces */
 455                         atomic_dec(&local->iff_allmultis);
 456                         ieee80211_stop_mesh(sdata);
 457                 }
 458                 /* fall through */
 459         default:
 460                 if (local->scan_sdata == sdata) {
 461                         if (!local->ops->hw_scan)
 462                                 cancel_delayed_work_sync(&local->scan_work);
 463                         /*
 464                          * The software scan can no longer run now, so we can
 465                          * clear out the scan_sdata reference. However, the
 466                          * hardware scan may still be running. The complete
 467                          * function must be prepared to handle a NULL value.
 468                          */
 469                         local->scan_sdata = NULL;
 470                         /*
 471                          * The memory barrier guarantees that another CPU
 472                          * that is hardware-scanning will now see the fact
 473                          * that this interface is gone.
 474                          */
 475                         smp_mb();
 476                         /*
 477                          * If software scanning, complete the scan but since
 478                          * the scan_sdata is NULL already don't send out a
 479                          * scan event to userspace -- the scan is incomplete.
 480                          */
 481                         if (local->sw_scanning)
 482                                 ieee80211_scan_completed(&local->hw);
 483                 }
 484
 485                 conf.vif = &sdata->vif;
 486                 conf.type = sdata->vif.type;
 487                 conf.mac_addr = dev->dev_addr;
 488                 /* disable all keys for as long as this netdev is down */
 489                 ieee80211_disable_keys(sdata);
 490                 local->ops->remove_interface(local_to_hw(local), &conf);
 491         }
 492
 493         sdata->bss = NULL;
 494
 495         if (local->open_count == 0) {
 496                 if (netif_running(local->mdev))
 497                         dev_close(local->mdev);
 498
 499                 if (local->ops->stop)
 500                         local->ops->stop(local_to_hw(local));
 501
 502                 ieee80211_led_radio(local, 0);
 503
 504                 flush_workqueue(local->hw.workqueue);
 505
 506                 tasklet_disable(&local->tx_pending_tasklet);
 507                 tasklet_disable(&local->tasklet);
 508         }
 509
 510         return 0;
 511 }
 512
 513 static void ieee80211_set_multicast_list(struct net_device *dev)
 514 {
 515         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 516         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 517         int allmulti, promisc, sdata_allmulti, sdata_promisc;
 518
 519         allmulti = !!(dev->flags & IFF_ALLMULTI);
 520         promisc = !!(dev->flags & IFF_PROMISC);
 521         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
 522         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
 523
 524         if (allmulti != sdata_allmulti) {
 525                 if (dev->flags & IFF_ALLMULTI)
 526                         atomic_inc(&local->iff_allmultis);
 527                 else
 528                         atomic_dec(&local->iff_allmultis);
 529                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
 530         }
 531
 532         if (promisc != sdata_promisc) {
 533                 if (dev->flags & IFF_PROMISC)
 534                         atomic_inc(&local->iff_promiscs);
 535                 else
 536                         atomic_dec(&local->iff_promiscs);
 537                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
 538         }
 539
 540         dev_mc_sync(local->mdev, dev);
 541 }
 542
 543 static void ieee80211_if_setup(struct net_device *dev)
 544 {
 545         ether_setup(dev);
 546         dev->hard_start_xmit = ieee80211_subif_start_xmit;
 547         dev->wireless_handlers = &ieee80211_iw_handler_def;
 548         dev->set_multicast_list = ieee80211_set_multicast_list;
 549         dev->change_mtu = ieee80211_change_mtu;
 550         dev->open = ieee80211_open;
 551         dev->stop = ieee80211_stop;
 552         dev->destructor = free_netdev;
 553         /* we will validate the address ourselves in ->open */
 554         dev->validate_addr = NULL;
 555 }
 556 /*
 557  * Called when the netdev is removed or, by the code below, before
 558  * the interface type changes.
 559  */
 560 static void ieee80211_teardown_sdata(struct net_device *dev)
 561 {
 562         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 563         struct ieee80211_local *local = sdata->local;
 564         struct beacon_data *beacon;
 565         struct sk_buff *skb;
 566         int flushed;
 567         int i;
 568
 569         /* free extra data */
 570         ieee80211_free_keys(sdata);
 571
 572         ieee80211_debugfs_remove_netdev(sdata);
 573
 574         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
 575                 __skb_queue_purge(&sdata->fragments[i].skb_list);
 576         sdata->fragment_next = 0;
 577
 578         switch (sdata->vif.type) {
 579         case NL80211_IFTYPE_AP:
 580                 beacon = sdata->u.ap.beacon;
 581                 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
 582                 synchronize_rcu();
 583                 kfree(beacon);
 584
 585                 while ((skb = skb_dequeue(&sdata->u.ap.ps_bc_buf))) {
 586                         local->total_ps_buffered--;
 587                         dev_kfree_skb(skb);
 588                 }
 589
 590                 break;
 591         case NL80211_IFTYPE_MESH_POINT:
 592                 if (ieee80211_vif_is_mesh(&sdata->vif))
 593                         mesh_rmc_free(sdata);
 594                 break;
 595         case NL80211_IFTYPE_STATION:
 596         case NL80211_IFTYPE_ADHOC:
 597                 kfree(sdata->u.sta.extra_ie);
 598                 kfree(sdata->u.sta.assocreq_ies);
 599                 kfree(sdata->u.sta.assocresp_ies);
 600                 kfree_skb(sdata->u.sta.probe_resp);
 601                 break;
 602         case NL80211_IFTYPE_WDS:
 603         case NL80211_IFTYPE_AP_VLAN:
 604         case NL80211_IFTYPE_MONITOR:
 605                 break;
 606         case NL80211_IFTYPE_UNSPECIFIED:
 607         case __NL80211_IFTYPE_AFTER_LAST:
 608                 BUG();
 609                 break;
 610         }
 611
 612         flushed = sta_info_flush(local, sdata);
 613         WARN_ON(flushed);
 614 }
 615
 616 /*
 617  * Helper function to initialise an interface to a specific type.
 618  */
 619 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
 620                                   enum nl80211_iftype type)
 621 {
 622         /* clear type-dependent union */
 623         memset(&sdata->u, 0, sizeof(sdata->u));
 624
 625         /* and set some type-dependent values */
 626         sdata->vif.type = type;
 627         sdata->dev->hard_start_xmit = ieee80211_subif_start_xmit;
 628
 629         /* only monitor differs */
 630         sdata->dev->type = ARPHRD_ETHER;
 631
 632         switch (type) {
 633         case NL80211_IFTYPE_AP:
 634                 skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
 635                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
 636                 break;
 637         case NL80211_IFTYPE_STATION:
 638         case NL80211_IFTYPE_ADHOC:
 639                 ieee80211_sta_setup_sdata(sdata);
 640                 break;
 641         case NL80211_IFTYPE_MESH_POINT:
 642                 if (ieee80211_vif_is_mesh(&sdata->vif))
 643                         ieee80211_mesh_init_sdata(sdata);
 644                 break;
 645         case NL80211_IFTYPE_MONITOR:
 646                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
 647                 sdata->dev->hard_start_xmit = ieee80211_monitor_start_xmit;
 648                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
 649                                       MONITOR_FLAG_OTHER_BSS;
 650                 break;
 651         case NL80211_IFTYPE_WDS:
 652         case NL80211_IFTYPE_AP_VLAN:
 653                 break;
 654         case NL80211_IFTYPE_UNSPECIFIED:
 655         case __NL80211_IFTYPE_AFTER_LAST:
 656                 BUG();
 657                 break;
 658         }
 659
 660         ieee80211_debugfs_add_netdev(sdata);
 661 }
 662
 663 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
 664                              enum nl80211_iftype type)
 665 {
 666         ASSERT_RTNL();
 667
 668         if (type == sdata->vif.type)
 669                 return 0;
 670
 671         /*
 672          * We could, here, on changes between IBSS/STA/MESH modes,
 673          * invoke an MLME function instead that disassociates etc.
 674          * and goes into the requested mode.
 675          */
 676
 677         if (netif_running(sdata->dev))
 678                 return -EBUSY;
 679
 680         /* Purge and reset type-dependent state. */
 681         ieee80211_teardown_sdata(sdata->dev);
 682         ieee80211_setup_sdata(sdata, type);
 683
 684         /* reset some values that shouldn't be kept across type changes */
 685         sdata->bss_conf.basic_rates =
 686                 ieee80211_mandatory_rates(sdata->local,
 687                         sdata->local->hw.conf.channel->band);
 688         sdata->drop_unencrypted = 0;
 689
 690         return 0;
 691 }
 692
 693 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
 694                      struct net_device **new_dev, enum nl80211_iftype type,
 695                      struct vif_params *params)
 696 {
 697         struct net_device *ndev;
 698         struct ieee80211_sub_if_data *sdata = NULL;
 699         int ret, i;
 700
 701         ASSERT_RTNL();
 702
 703         ndev = alloc_netdev(sizeof(*sdata) + local->hw.vif_data_size,
 704                             name, ieee80211_if_setup);
 705         if (!ndev)
 706                 return -ENOMEM;
 707
 708         ndev->needed_headroom = local->tx_headroom +
 709                                 4*6 /* four MAC addresses */
 710                                 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
 711                                 + 6 /* mesh */
 712                                 + 8 /* rfc1042/bridge tunnel */
 713                                 - ETH_HLEN /* ethernet hard_header_len */
 714                                 + IEEE80211_ENCRYPT_HEADROOM;
 715         ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
 716
 717         ret = dev_alloc_name(ndev, ndev->name);
 718         if (ret < 0)
 719                 goto fail;
 720
 721         memcpy(ndev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
 722         SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
 723
 724         /* don't use IEEE80211_DEV_TO_SUB_IF because it checks too much */
 725         sdata = netdev_priv(ndev);
 726         ndev->ieee80211_ptr = &sdata->wdev;
 727
 728         /* initialise type-independent data */
 729         sdata->wdev.wiphy = local->hw.wiphy;
 730         sdata->local = local;
 731         sdata->dev = ndev;
 732
 733         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
 734                 skb_queue_head_init(&sdata->fragments[i].skb_list);
 735
 736         INIT_LIST_HEAD(&sdata->key_list);
 737
 738         sdata->force_unicast_rateidx = -1;
 739         sdata->max_ratectrl_rateidx = -1;
 740
 741         /* setup type-dependent data */
 742         ieee80211_setup_sdata(sdata, type);
 743
 744         ret = register_netdevice(ndev);
 745         if (ret)
 746                 goto fail;
 747
 748         ndev->uninit = ieee80211_teardown_sdata;
 749
 750         if (ieee80211_vif_is_mesh(&sdata->vif) &&
 751             params && params->mesh_id_len)
 752                 ieee80211_sdata_set_mesh_id(sdata,
 753                                             params->mesh_id_len,
 754                                             params->mesh_id);
 755
 756         list_add_tail_rcu(&sdata->list, &local->interfaces);
 757
 758         if (new_dev)
 759                 *new_dev = ndev;
 760
 761         return 0;
 762
 763  fail:
 764         free_netdev(ndev);
 765         return ret;
 766 }
 767
 768 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
 769 {
 770         ASSERT_RTNL();
 771
 772         list_del_rcu(&sdata->list);
 773         synchronize_rcu();
 774         unregister_netdevice(sdata->dev);
 775 }
 776
 777 /*
 778  * Remove all interfaces, may only be called at hardware unregistration
 779  * time because it doesn't do RCU-safe list removals.
 780  */
 781 void ieee80211_remove_interfaces(struct ieee80211_local *local)
 782 {
 783         struct ieee80211_sub_if_data *sdata, *tmp;
 784
 785         ASSERT_RTNL();
 786
 787         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
 788                 list_del(&sdata->list);
 789                 unregister_netdevice(sdata->dev);
 790         }
 791 }