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 #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         if (compare_ether_addr(null_addr, local->mdev->dev_addr) == 0)
 194                 memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr,
 195                        ETH_ALEN);
 196
 197         /*
 198          * Validate the MAC address for this device.
 199          */
 200         if (!is_valid_ether_addr(dev->dev_addr)) {
 201                 if (!local->open_count)
 202                         drv_stop(local);
 203                 return -EADDRNOTAVAIL;
 204         }
 205
 206         switch (sdata->vif.type) {
 207         case NL80211_IFTYPE_AP_VLAN:
 208                 /* no need to tell driver */
 209                 break;
 210         case NL80211_IFTYPE_MONITOR:
 211                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 212                         local->cooked_mntrs++;
 213                         break;
 214                 }
 215
 216                 /* must be before the call to ieee80211_configure_filter */
 217                 local->monitors++;
 218                 if (local->monitors == 1) {
 219                         local->hw.conf.flags |= IEEE80211_CONF_RADIOTAP;
 220                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_RADIOTAP;
 221                 }
 222
 223                 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
 224                         local->fif_fcsfail++;
 225                 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
 226                         local->fif_plcpfail++;
 227                 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL)
 228                         local->fif_control++;
 229                 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
 230                         local->fif_other_bss++;
 231
 232                 netif_addr_lock_bh(local->mdev);
 233                 ieee80211_configure_filter(local);
 234                 netif_addr_unlock_bh(local->mdev);
 235                 break;
 236         default:
 237                 conf.vif = &sdata->vif;
 238                 conf.type = sdata->vif.type;
 239                 conf.mac_addr = dev->dev_addr;
 240                 res = drv_add_interface(local, &conf);
 241                 if (res)
 242                         goto err_stop;
 243
 244                 if (ieee80211_vif_is_mesh(&sdata->vif)) {
 245                         local->fif_other_bss++;
 246                         netif_addr_lock_bh(local->mdev);
 247                         ieee80211_configure_filter(local);
 248                         netif_addr_unlock_bh(local->mdev);
 249
 250                         ieee80211_start_mesh(sdata);
 251                 }
 252                 changed |= ieee80211_reset_erp_info(sdata);
 253                 ieee80211_bss_info_change_notify(sdata, changed);
 254                 ieee80211_enable_keys(sdata);
 255
 256                 if (sdata->vif.type == NL80211_IFTYPE_STATION)
 257                         netif_carrier_off(dev);
 258                 else
 259                         netif_carrier_on(dev);
 260         }
 261
 262         if (sdata->vif.type == NL80211_IFTYPE_WDS) {
 263                 /* Create STA entry for the WDS peer */
 264                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
 265                                      GFP_KERNEL);
 266                 if (!sta) {
 267                         res = -ENOMEM;
 268                         goto err_del_interface;
 269                 }
 270
 271                 /* no locking required since STA is not live yet */
 272                 sta->flags |= WLAN_STA_AUTHORIZED;
 273
 274                 res = sta_info_insert(sta);
 275                 if (res) {
 276                         /* STA has been freed */
 277                         goto err_del_interface;
 278                 }
 279         }
 280
 281         if (local->open_count == 0) {
 282                 res = dev_open(local->mdev);
 283                 WARN_ON(res);
 284                 if (res)
 285                         goto err_del_interface;
 286                 tasklet_enable(&local->tx_pending_tasklet);
 287                 tasklet_enable(&local->tasklet);
 288         }
 289
 290         /*
 291          * set_multicast_list will be invoked by the networking core
 292          * which will check whether any increments here were done in
 293          * error and sync them down to the hardware as filter flags.
 294          */
 295         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 296                 atomic_inc(&local->iff_allmultis);
 297
 298         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 299                 atomic_inc(&local->iff_promiscs);
 300
 301         hw_reconf_flags |= __ieee80211_recalc_idle(local);
 302
 303         local->open_count++;
 304         if (hw_reconf_flags) {
 305                 ieee80211_hw_config(local, hw_reconf_flags);
 306                 /*
 307                  * set default queue parameters so drivers don't
 308                  * need to initialise the hardware if the hardware
 309                  * doesn't start up with sane defaults
 310                  */
 311                 ieee80211_set_wmm_default(sdata);
 312         }
 313
 314         ieee80211_recalc_ps(local, -1);
 315
 316         /*
 317          * ieee80211_sta_work is disabled while network interface
 318          * is down. Therefore, some configuration changes may not
 319          * yet be effective. Trigger execution of ieee80211_sta_work
 320          * to fix this.
 321          */
 322         if (sdata->vif.type == NL80211_IFTYPE_STATION)
 323                 queue_work(local->hw.workqueue, &sdata->u.mgd.work);
 324
 325         netif_tx_start_all_queues(dev);
 326
 327         return 0;
 328  err_del_interface:
 329         drv_remove_interface(local, &conf);
 330  err_stop:
 331         if (!local->open_count)
 332                 drv_stop(local);
 333  err_del_bss:
 334         sdata->bss = NULL;
 335         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
 336                 list_del(&sdata->u.vlan.list);
 337         return res;
 338 }
 339
 340 static int ieee80211_stop(struct net_device *dev)
 341 {
 342         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 343         struct ieee80211_local *local = sdata->local;
 344         struct ieee80211_if_init_conf conf;
 345         struct sta_info *sta;
 346         u32 hw_reconf_flags = 0;
 347
 348         /*
 349          * Stop TX on this interface first.
 350          */
 351         netif_tx_stop_all_queues(dev);
 352
 353         /*
 354          * Now delete all active aggregation sessions.
 355          */
 356         rcu_read_lock();
 357
 358         list_for_each_entry_rcu(sta, &local->sta_list, list) {
 359                 if (sta->sdata == sdata)
 360                         ieee80211_sta_tear_down_BA_sessions(sta);
 361         }
 362
 363         rcu_read_unlock();
 364
 365         /*
 366          * Remove all stations associated with this interface.
 367          *
 368          * This must be done before calling ops->remove_interface()
 369          * because otherwise we can later invoke ops->sta_notify()
 370          * whenever the STAs are removed, and that invalidates driver
 371          * assumptions about always getting a vif pointer that is valid
 372          * (because if we remove a STA after ops->remove_interface()
 373          * the driver will have removed the vif info already!)
 374          *
 375          * We could relax this and only unlink the stations from the
 376          * hash table and list but keep them on a per-sdata list that
 377          * will be inserted back again when the interface is brought
 378          * up again, but I don't currently see a use case for that,
 379          * except with WDS which gets a STA entry created when it is
 380          * brought up.
 381          */
 382         sta_info_flush(local, sdata);
 383
 384         /*
 385          * Don't count this interface for promisc/allmulti while it
 386          * is down. dev_mc_unsync() will invoke set_multicast_list
 387          * on the master interface which will sync these down to the
 388          * hardware as filter flags.
 389          */
 390         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 391                 atomic_dec(&local->iff_allmultis);
 392
 393         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 394                 atomic_dec(&local->iff_promiscs);
 395
 396         dev_mc_unsync(local->mdev, dev);
 397         del_timer_sync(&local->dynamic_ps_timer);
 398         cancel_work_sync(&local->dynamic_ps_enable_work);
 399
 400         /* APs need special treatment */
 401         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 402                 struct ieee80211_sub_if_data *vlan, *tmp;
 403                 struct beacon_data *old_beacon = sdata->u.ap.beacon;
 404
 405                 /* remove beacon */
 406                 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
 407                 synchronize_rcu();
 408                 kfree(old_beacon);
 409
 410                 /* down all dependent devices, that is VLANs */
 411                 list_for_each_entry_safe(vlan, tmp, &sdata->u.ap.vlans,
 412                                          u.vlan.list)
 413                         dev_close(vlan->dev);
 414                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
 415         }
 416
 417         local->open_count--;
 418
 419         switch (sdata->vif.type) {
 420         case NL80211_IFTYPE_AP_VLAN:
 421                 list_del(&sdata->u.vlan.list);
 422                 /* no need to tell driver */
 423                 break;
 424         case NL80211_IFTYPE_MONITOR:
 425                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 426                         local->cooked_mntrs--;
 427                         break;
 428                 }
 429
 430                 local->monitors--;
 431                 if (local->monitors == 0) {
 432                         local->hw.conf.flags &= ~IEEE80211_CONF_RADIOTAP;
 433                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_RADIOTAP;
 434                 }
 435
 436                 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
 437                         local->fif_fcsfail--;
 438                 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
 439                         local->fif_plcpfail--;
 440                 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL)
 441                         local->fif_control--;
 442                 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
 443                         local->fif_other_bss--;
 444
 445                 netif_addr_lock_bh(local->mdev);
 446                 ieee80211_configure_filter(local);
 447                 netif_addr_unlock_bh(local->mdev);
 448                 break;
 449         case NL80211_IFTYPE_STATION:
 450                 del_timer_sync(&sdata->u.mgd.chswitch_timer);
 451                 del_timer_sync(&sdata->u.mgd.timer);
 452                 /*
 453                  * If the timer fired while we waited for it, it will have
 454                  * requeued the work. Now the work will be running again
 455                  * but will not rearm the timer again because it checks
 456                  * whether the interface is running, which, at this point,
 457                  * it no longer is.
 458                  */
 459                 cancel_work_sync(&sdata->u.mgd.work);
 460                 cancel_work_sync(&sdata->u.mgd.chswitch_work);
 461
 462                 cancel_work_sync(&sdata->u.mgd.beacon_loss_work);
 463
 464                 /*
 465                  * When we get here, the interface is marked down.
 466                  * Call synchronize_rcu() to wait for the RX path
 467                  * should it be using the interface and enqueuing
 468                  * frames at this very time on another CPU.
 469                  */
 470                 synchronize_rcu();
 471                 skb_queue_purge(&sdata->u.mgd.skb_queue);
 472                 /* fall through */
 473         case NL80211_IFTYPE_ADHOC:
 474                 if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 475                         del_timer_sync(&sdata->u.ibss.timer);
 476                         cancel_work_sync(&sdata->u.ibss.work);
 477                         synchronize_rcu();
 478                         skb_queue_purge(&sdata->u.ibss.skb_queue);
 479                 }
 480                 /* fall through */
 481         case NL80211_IFTYPE_MESH_POINT:
 482                 if (ieee80211_vif_is_mesh(&sdata->vif)) {
 483                         /* other_bss and allmulti are always set on mesh
 484                          * ifaces */
 485                         local->fif_other_bss--;
 486                         atomic_dec(&local->iff_allmultis);
 487
 488                         netif_addr_lock_bh(local->mdev);
 489                         ieee80211_configure_filter(local);
 490                         netif_addr_unlock_bh(local->mdev);
 491
 492                         ieee80211_stop_mesh(sdata);
 493                 }
 494                 /* fall through */
 495         default:
 496                 if (local->scan_sdata == sdata) {
 497                         if (!local->ops->hw_scan)
 498                                 cancel_delayed_work_sync(&local->scan_work);
 499                         /*
 500                          * The software scan can no longer run now, so we can
 501                          * clear out the scan_sdata reference. However, the
 502                          * hardware scan may still be running. The complete
 503                          * function must be prepared to handle a NULL value.
 504                          */
 505                         local->scan_sdata = NULL;
 506                         /*
 507                          * The memory barrier guarantees that another CPU
 508                          * that is hardware-scanning will now see the fact
 509                          * that this interface is gone.
 510                          */
 511                         smp_mb();
 512                         /*
 513                          * If software scanning, complete the scan but since
 514                          * the scan_sdata is NULL already don't send out a
 515                          * scan event to userspace -- the scan is incomplete.
 516                          */
 517                         if (local->sw_scanning)
 518                                 ieee80211_scan_completed(&local->hw, true);
 519                 }
 520
 521                 conf.vif = &sdata->vif;
 522                 conf.type = sdata->vif.type;
 523                 conf.mac_addr = dev->dev_addr;
 524                 /* disable all keys for as long as this netdev is down */
 525                 ieee80211_disable_keys(sdata);
 526                 drv_remove_interface(local, &conf);
 527         }
 528
 529         sdata->bss = NULL;
 530
 531         hw_reconf_flags |= __ieee80211_recalc_idle(local);
 532
 533         ieee80211_recalc_ps(local, -1);
 534
 535         if (local->open_count == 0) {
 536                 if (netif_running(local->mdev))
 537                         dev_close(local->mdev);
 538
 539                 drv_stop(local);
 540
 541                 ieee80211_led_radio(local, false);
 542
 543                 flush_workqueue(local->hw.workqueue);
 544
 545                 tasklet_disable(&local->tx_pending_tasklet);
 546                 tasklet_disable(&local->tasklet);
 547
 548                 /* no reconfiguring after stop! */
 549                 hw_reconf_flags = 0;
 550         }
 551
 552         /* do after stop to avoid reconfiguring when we stop anyway */
 553         if (hw_reconf_flags)
 554                 ieee80211_hw_config(local, hw_reconf_flags);
 555
 556         return 0;
 557 }
 558
 559 static void ieee80211_set_multicast_list(struct net_device *dev)
 560 {
 561         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 562         struct ieee80211_local *local = sdata->local;
 563         int allmulti, promisc, sdata_allmulti, sdata_promisc;
 564
 565         allmulti = !!(dev->flags & IFF_ALLMULTI);
 566         promisc = !!(dev->flags & IFF_PROMISC);
 567         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
 568         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
 569
 570         if (allmulti != sdata_allmulti) {
 571                 if (dev->flags & IFF_ALLMULTI)
 572                         atomic_inc(&local->iff_allmultis);
 573                 else
 574                         atomic_dec(&local->iff_allmultis);
 575                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
 576         }
 577
 578         if (promisc != sdata_promisc) {
 579                 if (dev->flags & IFF_PROMISC)
 580                         atomic_inc(&local->iff_promiscs);
 581                 else
 582                         atomic_dec(&local->iff_promiscs);
 583                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
 584         }
 585
 586         dev_mc_sync(local->mdev, dev);
 587 }
 588
 589 /*
 590  * Called when the netdev is removed or, by the code below, before
 591  * the interface type changes.
 592  */
 593 static void ieee80211_teardown_sdata(struct net_device *dev)
 594 {
 595         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 596         struct ieee80211_local *local = sdata->local;
 597         struct beacon_data *beacon;
 598         struct sk_buff *skb;
 599         int flushed;
 600         int i;
 601
 602         /* free extra data */
 603         ieee80211_free_keys(sdata);
 604
 605         ieee80211_debugfs_remove_netdev(sdata);
 606
 607         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
 608                 __skb_queue_purge(&sdata->fragments[i].skb_list);
 609         sdata->fragment_next = 0;
 610
 611         switch (sdata->vif.type) {
 612         case NL80211_IFTYPE_AP:
 613                 beacon = sdata->u.ap.beacon;
 614                 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
 615                 synchronize_rcu();
 616                 kfree(beacon);
 617
 618                 while ((skb = skb_dequeue(&sdata->u.ap.ps_bc_buf))) {
 619                         local->total_ps_buffered--;
 620                         dev_kfree_skb(skb);
 621                 }
 622
 623                 break;
 624         case NL80211_IFTYPE_MESH_POINT:
 625                 if (ieee80211_vif_is_mesh(&sdata->vif))
 626                         mesh_rmc_free(sdata);
 627                 break;
 628         case NL80211_IFTYPE_ADHOC:
 629                 if (WARN_ON(sdata->u.ibss.presp))
 630                         kfree_skb(sdata->u.ibss.presp);
 631                 break;
 632         case NL80211_IFTYPE_STATION:
 633         case NL80211_IFTYPE_WDS:
 634         case NL80211_IFTYPE_AP_VLAN:
 635         case NL80211_IFTYPE_MONITOR:
 636                 break;
 637         case NL80211_IFTYPE_UNSPECIFIED:
 638         case __NL80211_IFTYPE_AFTER_LAST:
 639                 BUG();
 640                 break;
 641         }
 642
 643         flushed = sta_info_flush(local, sdata);
 644         WARN_ON(flushed);
 645 }
 646
 647 static const struct net_device_ops ieee80211_dataif_ops = {
 648         .ndo_open               = ieee80211_open,
 649         .ndo_stop               = ieee80211_stop,
 650         .ndo_uninit             = ieee80211_teardown_sdata,
 651         .ndo_start_xmit         = ieee80211_subif_start_xmit,
 652         .ndo_set_multicast_list = ieee80211_set_multicast_list,
 653         .ndo_change_mtu         = ieee80211_change_mtu,
 654         .ndo_set_mac_address    = eth_mac_addr,
 655 };
 656
 657 static const struct net_device_ops ieee80211_monitorif_ops = {
 658         .ndo_open               = ieee80211_open,
 659         .ndo_stop               = ieee80211_stop,
 660         .ndo_uninit             = ieee80211_teardown_sdata,
 661         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
 662         .ndo_set_multicast_list = ieee80211_set_multicast_list,
 663         .ndo_change_mtu         = ieee80211_change_mtu,
 664         .ndo_set_mac_address    = eth_mac_addr,
 665 };
 666
 667 static void ieee80211_if_setup(struct net_device *dev)
 668 {
 669         ether_setup(dev);
 670         dev->netdev_ops = &ieee80211_dataif_ops;
 671         dev->wireless_handlers = &ieee80211_iw_handler_def;
 672         dev->destructor = free_netdev;
 673 }
 674
 675 /*
 676  * Helper function to initialise an interface to a specific type.
 677  */
 678 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
 679                                   enum nl80211_iftype type)
 680 {
 681         /* clear type-dependent union */
 682         memset(&sdata->u, 0, sizeof(sdata->u));
 683
 684         /* and set some type-dependent values */
 685         sdata->vif.type = type;
 686         sdata->dev->netdev_ops = &ieee80211_dataif_ops;
 687         sdata->wdev.iftype = type;
 688
 689         /* only monitor differs */
 690         sdata->dev->type = ARPHRD_ETHER;
 691
 692         switch (type) {
 693         case NL80211_IFTYPE_AP:
 694                 skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
 695                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
 696                 break;
 697         case NL80211_IFTYPE_STATION:
 698                 ieee80211_sta_setup_sdata(sdata);
 699                 break;
 700         case NL80211_IFTYPE_ADHOC:
 701                 ieee80211_ibss_setup_sdata(sdata);
 702                 break;
 703         case NL80211_IFTYPE_MESH_POINT:
 704                 if (ieee80211_vif_is_mesh(&sdata->vif))
 705                         ieee80211_mesh_init_sdata(sdata);
 706                 break;
 707         case NL80211_IFTYPE_MONITOR:
 708                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
 709                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
 710                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
 711                                       MONITOR_FLAG_OTHER_BSS;
 712                 break;
 713         case NL80211_IFTYPE_WDS:
 714         case NL80211_IFTYPE_AP_VLAN:
 715                 break;
 716         case NL80211_IFTYPE_UNSPECIFIED:
 717         case __NL80211_IFTYPE_AFTER_LAST:
 718                 BUG();
 719                 break;
 720         }
 721
 722         ieee80211_debugfs_add_netdev(sdata);
 723 }
 724
 725 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
 726                              enum nl80211_iftype type)
 727 {
 728         ASSERT_RTNL();
 729
 730         if (type == sdata->vif.type)
 731                 return 0;
 732
 733         /* Setting ad-hoc mode on non-IBSS channel is not supported. */
 734         if (sdata->local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS &&
 735             type == NL80211_IFTYPE_ADHOC)
 736                 return -EOPNOTSUPP;
 737
 738         /*
 739          * We could, here, on changes between IBSS/STA/MESH modes,
 740          * invoke an MLME function instead that disassociates etc.
 741          * and goes into the requested mode.
 742          */
 743
 744         if (netif_running(sdata->dev))
 745                 return -EBUSY;
 746
 747         /* Purge and reset type-dependent state. */
 748         ieee80211_teardown_sdata(sdata->dev);
 749         ieee80211_setup_sdata(sdata, type);
 750
 751         /* reset some values that shouldn't be kept across type changes */
 752         sdata->vif.bss_conf.basic_rates =
 753                 ieee80211_mandatory_rates(sdata->local,
 754                         sdata->local->hw.conf.channel->band);
 755         sdata->drop_unencrypted = 0;
 756
 757         return 0;
 758 }
 759
 760 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
 761                      struct net_device **new_dev, enum nl80211_iftype type,
 762                      struct vif_params *params)
 763 {
 764         struct net_device *ndev;
 765         struct ieee80211_sub_if_data *sdata = NULL;
 766         int ret, i;
 767
 768         ASSERT_RTNL();
 769
 770         ndev = alloc_netdev(sizeof(*sdata) + local->hw.vif_data_size,
 771                             name, ieee80211_if_setup);
 772         if (!ndev)
 773                 return -ENOMEM;
 774
 775         ndev->needed_headroom = local->tx_headroom +
 776                                 4*6 /* four MAC addresses */
 777                                 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
 778                                 + 6 /* mesh */
 779                                 + 8 /* rfc1042/bridge tunnel */
 780                                 - ETH_HLEN /* ethernet hard_header_len */
 781                                 + IEEE80211_ENCRYPT_HEADROOM;
 782         ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
 783
 784         ret = dev_alloc_name(ndev, ndev->name);
 785         if (ret < 0)
 786                 goto fail;
 787
 788         memcpy(ndev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
 789         SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
 790         ndev->features |= NETIF_F_NETNS_LOCAL;
 791
 792         /* don't use IEEE80211_DEV_TO_SUB_IF because it checks too much */
 793         sdata = netdev_priv(ndev);
 794         ndev->ieee80211_ptr = &sdata->wdev;
 795
 796         /* initialise type-independent data */
 797         sdata->wdev.wiphy = local->hw.wiphy;
 798         sdata->local = local;
 799         sdata->dev = ndev;
 800
 801         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
 802                 skb_queue_head_init(&sdata->fragments[i].skb_list);
 803
 804         INIT_LIST_HEAD(&sdata->key_list);
 805
 806         sdata->force_unicast_rateidx = -1;
 807         sdata->max_ratectrl_rateidx = -1;
 808
 809         /* setup type-dependent data */
 810         ieee80211_setup_sdata(sdata, type);
 811
 812         ret = register_netdevice(ndev);
 813         if (ret)
 814                 goto fail;
 815
 816         if (ieee80211_vif_is_mesh(&sdata->vif) &&
 817             params && params->mesh_id_len)
 818                 ieee80211_sdata_set_mesh_id(sdata,
 819                                             params->mesh_id_len,
 820                                             params->mesh_id);
 821
 822         mutex_lock(&local->iflist_mtx);
 823         list_add_tail_rcu(&sdata->list, &local->interfaces);
 824         mutex_unlock(&local->iflist_mtx);
 825
 826         if (new_dev)
 827                 *new_dev = ndev;
 828
 829         return 0;
 830
 831  fail:
 832         free_netdev(ndev);
 833         return ret;
 834 }
 835
 836 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
 837 {
 838         ASSERT_RTNL();
 839
 840         mutex_lock(&sdata->local->iflist_mtx);
 841         list_del_rcu(&sdata->list);
 842         mutex_unlock(&sdata->local->iflist_mtx);
 843
 844         synchronize_rcu();
 845         unregister_netdevice(sdata->dev);
 846 }
 847
 848 /*
 849  * Remove all interfaces, may only be called at hardware unregistration
 850  * time because it doesn't do RCU-safe list removals.
 851  */
 852 void ieee80211_remove_interfaces(struct ieee80211_local *local)
 853 {
 854         struct ieee80211_sub_if_data *sdata, *tmp;
 855
 856         ASSERT_RTNL();
 857
 858         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
 859                 /*
 860                  * we cannot hold the iflist_mtx across unregister_netdevice,
 861                  * but we only need to hold it for list modifications to lock
 862                  * out readers since we're under the RTNL here as all other
 863                  * writers.
 864                  */
 865                 mutex_lock(&local->iflist_mtx);
 866                 list_del(&sdata->list);
 867                 mutex_unlock(&local->iflist_mtx);
 868
 869                 unregister_netdevice(sdata->dev);
 870         }
 871 }
 872
 873 static u32 ieee80211_idle_off(struct ieee80211_local *local,
 874                               const char *reason)
 875 {
 876         if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
 877                 return 0;
 878
 879 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 880         printk(KERN_DEBUG "%s: device no longer idle - %s\n",
 881                wiphy_name(local->hw.wiphy), reason);
 882 #endif
 883
 884         local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
 885         return IEEE80211_CONF_CHANGE_IDLE;
 886 }
 887
 888 static u32 ieee80211_idle_on(struct ieee80211_local *local)
 889 {
 890         if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
 891                 return 0;
 892
 893 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 894         printk(KERN_DEBUG "%s: device now idle\n",
 895                wiphy_name(local->hw.wiphy));
 896 #endif
 897
 898         local->hw.conf.flags |= IEEE80211_CONF_IDLE;
 899         return IEEE80211_CONF_CHANGE_IDLE;
 900 }
 901
 902 u32 __ieee80211_recalc_idle(struct ieee80211_local *local)
 903 {
 904         struct ieee80211_sub_if_data *sdata;
 905         int count = 0;
 906
 907         if (local->hw_scanning || local->sw_scanning)
 908                 return ieee80211_idle_off(local, "scanning");
 909
 910         list_for_each_entry(sdata, &local->interfaces, list) {
 911                 if (!netif_running(sdata->dev))
 912                         continue;
 913                 /* do not count disabled managed interfaces */
 914                 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
 915                     !sdata->u.mgd.associated &&
 916                     list_empty(&sdata->u.mgd.work_list))
 917                         continue;
 918                 /* do not count unused IBSS interfaces */
 919                 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
 920                     !sdata->u.ibss.ssid_len)
 921                         continue;
 922                 /* count everything else */
 923                 count++;
 924         }
 925
 926         if (!count)
 927                 return ieee80211_idle_on(local);
 928         else
 929                 return ieee80211_idle_off(local, "in use");
 930
 931         return 0;
 932 }
 933
 934 void ieee80211_recalc_idle(struct ieee80211_local *local)
 935 {
 936         u32 chg;
 937
 938         mutex_lock(&local->iflist_mtx);
 939         chg = __ieee80211_recalc_idle(local);
 940         mutex_unlock(&local->iflist_mtx);
 941         if (chg)
 942                 ieee80211_hw_config(local, chg);
 943 }