net/mac80211/iface.c

   1 /*
   2  * Interface handling (except master interface)
   3  *
   4  * Copyright 2002-2005, Instant802 Networks, Inc.
   5  * Copyright 2005-2006, Devicescape Software, Inc.
   6  * Copyright (c) 2006 Jiri Benc <jbenc@suse.cz>
   7  * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13 #include <linux/kernel.h>
  14 #include <linux/if_arp.h>
  15 #include <linux/netdevice.h>
  16 #include <linux/rtnetlink.h>
  17 #include <net/mac80211.h>
  18 #include "ieee80211_i.h"
  19 #include "sta_info.h"
  20 #include "debugfs_netdev.h"
  21 #include "mesh.h"
  22 #include "led.h"
  23 #include "driver-ops.h"
  24
  25 /**
  26  * DOC: Interface list locking
  27  *
  28  * The interface list in each struct ieee80211_local is protected
  29  * three-fold:
  30  *
  31  * (1) modifications may only be done under the RTNL
  32  * (2) modifications and readers are protected against each other by
  33  *     the iflist_mtx.
  34  * (3) modifications are done in an RCU manner so atomic readers
  35  *     can traverse the list in RCU-safe blocks.
  36  *
  37  * As a consequence, reads (traversals) of the list can be protected
  38  * by either the RTNL, the iflist_mtx or RCU.
  39  */
  40
  41
  42 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
  43 {
  44         int meshhdrlen;
  45         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
  46
  47         meshhdrlen = (sdata->vif.type == NL80211_IFTYPE_MESH_POINT) ? 5 : 0;
  48
  49         /* FIX: what would be proper limits for MTU?
  50          * This interface uses 802.3 frames. */
  51         if (new_mtu < 256 ||
  52             new_mtu > IEEE80211_MAX_DATA_LEN - 24 - 6 - meshhdrlen) {
  53                 return -EINVAL;
  54         }
  55
  56 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
  57         printk(KERN_DEBUG "%s: setting MTU %d\n", dev->name, new_mtu);
  58 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
  59         dev->mtu = new_mtu;
  60         return 0;
  61 }
  62
  63 static inline int identical_mac_addr_allowed(int type1, int type2)
  64 {
  65         return type1 == NL80211_IFTYPE_MONITOR ||
  66                 type2 == NL80211_IFTYPE_MONITOR ||
  67                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
  68                 (type1 == NL80211_IFTYPE_WDS &&
  69                         (type2 == NL80211_IFTYPE_WDS ||
  70                          type2 == NL80211_IFTYPE_AP)) ||
  71                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
  72                 (type1 == NL80211_IFTYPE_AP_VLAN &&
  73                         (type2 == NL80211_IFTYPE_AP ||
  74                          type2 == NL80211_IFTYPE_AP_VLAN));
  75 }
  76
  77 static int ieee80211_open(struct net_device *dev)
  78 {
  79         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
  80         struct ieee80211_sub_if_data *nsdata;
  81         struct ieee80211_local *local = sdata->local;
  82         struct sta_info *sta;
  83         struct ieee80211_if_init_conf conf;
  84         u32 changed = 0;
  85         int res;
  86         u32 hw_reconf_flags = 0;
  87         u8 null_addr[ETH_ALEN] = {0};
  88
  89         /* fail early if user set an invalid address */
  90         if (compare_ether_addr(dev->dev_addr, null_addr) &&
  91             !is_valid_ether_addr(dev->dev_addr))
  92                 return -EADDRNOTAVAIL;
  93
  94         /* we hold the RTNL here so can safely walk the list */
  95         list_for_each_entry(nsdata, &local->interfaces, list) {
  96                 struct net_device *ndev = nsdata->dev;
  97
  98                 if (ndev != dev && netif_running(ndev)) {
  99                         /*
 100                          * Allow only a single IBSS interface to be up at any
 101                          * time. This is restricted because beacon distribution
 102                          * cannot work properly if both are in the same IBSS.
 103                          *
 104                          * To remove this restriction we'd have to disallow them
 105                          * from setting the same SSID on different IBSS interfaces
 106                          * belonging to the same hardware. Then, however, we're
 107                          * faced with having to adopt two different TSF timers...
 108                          */
 109                         if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
 110                             nsdata->vif.type == NL80211_IFTYPE_ADHOC)
 111                                 return -EBUSY;
 112
 113                         /*
 114                          * The remaining checks are only performed for interfaces
 115                          * with the same MAC address.
 116                          */
 117                         if (compare_ether_addr(dev->dev_addr, ndev->dev_addr))
 118                                 continue;
 119
 120                         /*
 121                          * check whether it may have the same address
 122                          */
 123                         if (!identical_mac_addr_allowed(sdata->vif.type,
 124                                                         nsdata->vif.type))
 125                                 return -ENOTUNIQ;
 126
 127                         /*
 128                          * can only add VLANs to enabled APs
 129                          */
 130                         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
 131                             nsdata->vif.type == NL80211_IFTYPE_AP)
 132                                 sdata->bss = &nsdata->u.ap;
 133                 }
 134         }
 135
 136         switch (sdata->vif.type) {
 137         case NL80211_IFTYPE_WDS:
 138                 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
 139                         return -ENOLINK;
 140                 break;
 141         case NL80211_IFTYPE_AP_VLAN:
 142                 if (!sdata->bss)
 143                         return -ENOLINK;
 144                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
 145                 break;
 146         case NL80211_IFTYPE_AP:
 147                 sdata->bss = &sdata->u.ap;
 148                 break;
 149         case NL80211_IFTYPE_MESH_POINT:
 150                 if (!ieee80211_vif_is_mesh(&sdata->vif))
 151                         break;
 152                 /* mesh ifaces must set allmulti to forward mcast traffic */
 153                 atomic_inc(&local->iff_allmultis);
 154                 break;
 155         case NL80211_IFTYPE_STATION:
 156         case NL80211_IFTYPE_MONITOR:
 157         case NL80211_IFTYPE_ADHOC:
 158                 /* no special treatment */
 159                 break;
 160         case NL80211_IFTYPE_UNSPECIFIED:
 161         case __NL80211_IFTYPE_AFTER_LAST:
 162                 /* cannot happen */
 163                 WARN_ON(1);
 164                 break;
 165         }
 166
 167         if (local->open_count == 0) {
 168                 res = drv_start(local);
 169                 if (res)
 170                         goto err_del_bss;
 171                 /* we're brought up, everything changes */
 172                 hw_reconf_flags = ~0;
 173                 ieee80211_led_radio(local, true);
 174         }
 175
 176         /*
 177          * Check all interfaces and copy the hopefully now-present
 178          * MAC address to those that have the special null one.
 179          */
 180         list_for_each_entry(nsdata, &local->interfaces, list) {
 181                 struct net_device *ndev = nsdata->dev;
 182
 183                 /*
 184                  * No need to check netif_running since we do not allow
 185                  * it to start up with this invalid address.
 186                  */
 187                 if (compare_ether_addr(null_addr, ndev->dev_addr) == 0)
 188                         memcpy(ndev->dev_addr,
 189                                local->hw.wiphy->perm_addr,
 190                                ETH_ALEN);
 191         }
 192
 193         /*
 194          * Validate the MAC address for this device.
 195          */
 196         if (!is_valid_ether_addr(dev->dev_addr)) {
 197                 if (!local->open_count)
 198                         drv_stop(local);
 199                 return -EADDRNOTAVAIL;
 200         }
 201
 202         switch (sdata->vif.type) {
 203         case NL80211_IFTYPE_AP_VLAN:
 204                 /* no need to tell driver */
 205                 break;
 206         case NL80211_IFTYPE_MONITOR:
 207                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 208                         local->cooked_mntrs++;
 209                         break;
 210                 }
 211
 212                 /* must be before the call to ieee80211_configure_filter */
 213                 local->monitors++;
 214                 if (local->monitors == 1) {
 215                         local->hw.conf.flags |= IEEE80211_CONF_RADIOTAP;
 216                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_RADIOTAP;
 217                 }
 218
 219                 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
 220                         local->fif_fcsfail++;
 221                 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
 222                         local->fif_plcpfail++;
 223                 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL)
 224                         local->fif_control++;
 225                 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
 226                         local->fif_other_bss++;
 227
 228                 spin_lock_bh(&local->filter_lock);
 229                 ieee80211_configure_filter(local);
 230                 spin_unlock_bh(&local->filter_lock);
 231                 break;
 232         default:
 233                 conf.vif = &sdata->vif;
 234                 conf.type = sdata->vif.type;
 235                 conf.mac_addr = dev->dev_addr;
 236                 res = drv_add_interface(local, &conf);
 237                 if (res)
 238                         goto err_stop;
 239
 240                 if (ieee80211_vif_is_mesh(&sdata->vif)) {
 241                         local->fif_other_bss++;
 242                         spin_lock_bh(&local->filter_lock);
 243                         ieee80211_configure_filter(local);
 244                         spin_unlock_bh(&local->filter_lock);
 245
 246                         ieee80211_start_mesh(sdata);
 247                 }
 248                 changed |= ieee80211_reset_erp_info(sdata);
 249                 ieee80211_bss_info_change_notify(sdata, changed);
 250                 ieee80211_enable_keys(sdata);
 251
 252                 if (sdata->vif.type == NL80211_IFTYPE_STATION)
 253                         netif_carrier_off(dev);
 254                 else
 255                         netif_carrier_on(dev);
 256         }
 257
 258         if (sdata->vif.type == NL80211_IFTYPE_WDS) {
 259                 /* Create STA entry for the WDS peer */
 260                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
 261                                      GFP_KERNEL);
 262                 if (!sta) {
 263                         res = -ENOMEM;
 264                         goto err_del_interface;
 265                 }
 266
 267                 /* no locking required since STA is not live yet */
 268                 sta->flags |= WLAN_STA_AUTHORIZED;
 269
 270                 res = sta_info_insert(sta);
 271                 if (res) {
 272                         /* STA has been freed */
 273                         goto err_del_interface;
 274                 }
 275         }
 276
 277         if (local->open_count == 0) {
 278                 tasklet_enable(&local->tx_pending_tasklet);
 279                 tasklet_enable(&local->tasklet);
 280         }
 281
 282         /*
 283          * set_multicast_list will be invoked by the networking core
 284          * which will check whether any increments here were done in
 285          * error and sync them down to the hardware as filter flags.
 286          */
 287         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 288                 atomic_inc(&local->iff_allmultis);
 289
 290         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 291                 atomic_inc(&local->iff_promiscs);
 292
 293         hw_reconf_flags |= __ieee80211_recalc_idle(local);
 294
 295         local->open_count++;
 296         if (hw_reconf_flags) {
 297                 ieee80211_hw_config(local, hw_reconf_flags);
 298                 /*
 299                  * set default queue parameters so drivers don't
 300                  * need to initialise the hardware if the hardware
 301                  * doesn't start up with sane defaults
 302                  */
 303                 ieee80211_set_wmm_default(sdata);
 304         }
 305
 306         ieee80211_recalc_ps(local, -1);
 307
 308         /*
 309          * ieee80211_sta_work is disabled while network interface
 310          * is down. Therefore, some configuration changes may not
 311          * yet be effective. Trigger execution of ieee80211_sta_work
 312          * to fix this.
 313          */
 314         if (sdata->vif.type == NL80211_IFTYPE_STATION)
 315                 queue_work(local->hw.workqueue, &sdata->u.mgd.work);
 316
 317         netif_tx_start_all_queues(dev);
 318
 319         return 0;
 320  err_del_interface:
 321         drv_remove_interface(local, &conf);
 322  err_stop:
 323         if (!local->open_count)
 324                 drv_stop(local);
 325  err_del_bss:
 326         sdata->bss = NULL;
 327         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
 328                 list_del(&sdata->u.vlan.list);
 329         return res;
 330 }
 331
 332 static int ieee80211_stop(struct net_device *dev)
 333 {
 334         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 335         struct ieee80211_local *local = sdata->local;
 336         struct ieee80211_if_init_conf conf;
 337         struct sta_info *sta;
 338         u32 hw_reconf_flags = 0;
 339
 340         /*
 341          * Stop TX on this interface first.
 342          */
 343         netif_tx_stop_all_queues(dev);
 344
 345         /*
 346          * Now delete all active aggregation sessions.
 347          */
 348         rcu_read_lock();
 349
 350         list_for_each_entry_rcu(sta, &local->sta_list, list) {
 351                 if (sta->sdata == sdata)
 352                         ieee80211_sta_tear_down_BA_sessions(sta);
 353         }
 354
 355         rcu_read_unlock();
 356
 357         /*
 358          * Remove all stations associated with this interface.
 359          *
 360          * This must be done before calling ops->remove_interface()
 361          * because otherwise we can later invoke ops->sta_notify()
 362          * whenever the STAs are removed, and that invalidates driver
 363          * assumptions about always getting a vif pointer that is valid
 364          * (because if we remove a STA after ops->remove_interface()
 365          * the driver will have removed the vif info already!)
 366          *
 367          * We could relax this and only unlink the stations from the
 368          * hash table and list but keep them on a per-sdata list that
 369          * will be inserted back again when the interface is brought
 370          * up again, but I don't currently see a use case for that,
 371          * except with WDS which gets a STA entry created when it is
 372          * brought up.
 373          */
 374         sta_info_flush(local, sdata);
 375
 376         /*
 377          * Don't count this interface for promisc/allmulti while it
 378          * is down. dev_mc_unsync() will invoke set_multicast_list
 379          * on the master interface which will sync these down to the
 380          * hardware as filter flags.
 381          */
 382         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 383                 atomic_dec(&local->iff_allmultis);
 384
 385         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 386                 atomic_dec(&local->iff_promiscs);
 387
 388         netif_addr_lock_bh(dev);
 389         spin_lock_bh(&local->filter_lock);
 390         __dev_addr_unsync(&local->mc_list, &local->mc_count,
 391                           &dev->mc_list, &dev->mc_count);
 392         ieee80211_configure_filter(local);
 393         spin_unlock_bh(&local->filter_lock);
 394         netif_addr_unlock_bh(dev);
 395
 396         del_timer_sync(&local->dynamic_ps_timer);
 397         cancel_work_sync(&local->dynamic_ps_enable_work);
 398
 399         /* APs need special treatment */
 400         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 401                 struct ieee80211_sub_if_data *vlan, *tmp;
 402                 struct beacon_data *old_beacon = sdata->u.ap.beacon;
 403
 404                 /* remove beacon */
 405                 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
 406                 synchronize_rcu();
 407                 kfree(old_beacon);
 408
 409                 /* down all dependent devices, that is VLANs */
 410                 list_for_each_entry_safe(vlan, tmp, &sdata->u.ap.vlans,
 411                                          u.vlan.list)
 412                         dev_close(vlan->dev);
 413                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
 414         }
 415
 416         local->open_count--;
 417
 418         switch (sdata->vif.type) {
 419         case NL80211_IFTYPE_AP_VLAN:
 420                 list_del(&sdata->u.vlan.list);
 421                 /* no need to tell driver */
 422                 break;
 423         case NL80211_IFTYPE_MONITOR:
 424                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 425                         local->cooked_mntrs--;
 426                         break;
 427                 }
 428
 429                 local->monitors--;
 430                 if (local->monitors == 0) {
 431                         local->hw.conf.flags &= ~IEEE80211_CONF_RADIOTAP;
 432                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_RADIOTAP;
 433                 }
 434
 435                 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
 436                         local->fif_fcsfail--;
 437                 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
 438                         local->fif_plcpfail--;
 439                 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL)
 440                         local->fif_control--;
 441                 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
 442                         local->fif_other_bss--;
 443
 444                 spin_lock_bh(&local->filter_lock);
 445                 ieee80211_configure_filter(local);
 446                 spin_unlock_bh(&local->filter_lock);
 447                 break;
 448         case NL80211_IFTYPE_STATION:
 449                 del_timer_sync(&sdata->u.mgd.chswitch_timer);
 450                 del_timer_sync(&sdata->u.mgd.timer);
 451                 del_timer_sync(&sdata->u.mgd.conn_mon_timer);
 452                 del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
 453                 /*
 454                  * If any of the timers fired while we waited for it, it will
 455                  * have queued its work. Now the work will be running again
 456                  * but will not rearm the timer again because it checks
 457                  * whether the interface is running, which, at this point,
 458                  * it no longer is.
 459                  */
 460                 cancel_work_sync(&sdata->u.mgd.work);
 461                 cancel_work_sync(&sdata->u.mgd.chswitch_work);
 462                 cancel_work_sync(&sdata->u.mgd.monitor_work);
 463                 cancel_work_sync(&sdata->u.mgd.beacon_loss_work);
 464
 465                 /*
 466                  * When we get here, the interface is marked down.
 467                  * Call synchronize_rcu() to wait for the RX path
 468                  * should it be using the interface and enqueuing
 469                  * frames at this very time on another CPU.
 470                  */
 471                 synchronize_rcu();
 472                 skb_queue_purge(&sdata->u.mgd.skb_queue);
 473                 /* fall through */
 474         case NL80211_IFTYPE_ADHOC:
 475                 if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 476                         del_timer_sync(&sdata->u.ibss.timer);
 477                         cancel_work_sync(&sdata->u.ibss.work);
 478                         synchronize_rcu();
 479                         skb_queue_purge(&sdata->u.ibss.skb_queue);
 480                 }
 481                 /* fall through */
 482         case NL80211_IFTYPE_MESH_POINT:
 483                 if (ieee80211_vif_is_mesh(&sdata->vif)) {
 484                         /* other_bss and allmulti are always set on mesh
 485                          * ifaces */
 486                         local->fif_other_bss--;
 487                         atomic_dec(&local->iff_allmultis);
 488
 489                         spin_lock_bh(&local->filter_lock);
 490                         ieee80211_configure_filter(local);
 491                         spin_unlock_bh(&local->filter_lock);
 492
 493                         ieee80211_stop_mesh(sdata);
 494                 }
 495                 /* fall through */
 496         default:
 497                 if (local->scan_sdata == sdata) {
 498                         if (!local->ops->hw_scan)
 499                                 cancel_delayed_work_sync(&local->scan_work);
 500                         /*
 501                          * The software scan can no longer run now, so we can
 502                          * clear out the scan_sdata reference. However, the
 503                          * hardware scan may still be running. The complete
 504                          * function must be prepared to handle a NULL value.
 505                          */
 506                         local->scan_sdata = NULL;
 507                         /*
 508                          * The memory barrier guarantees that another CPU
 509                          * that is hardware-scanning will now see the fact
 510                          * that this interface is gone.
 511                          */
 512                         smp_mb();
 513                         /*
 514                          * If software scanning, complete the scan but since
 515                          * the scan_sdata is NULL already don't send out a
 516                          * scan event to userspace -- the scan is incomplete.
 517                          */
 518                         if (local->sw_scanning)
 519                                 ieee80211_scan_completed(&local->hw, true);
 520                 }
 521
 522                 conf.vif = &sdata->vif;
 523                 conf.type = sdata->vif.type;
 524                 conf.mac_addr = dev->dev_addr;
 525                 /* disable all keys for as long as this netdev is down */
 526                 ieee80211_disable_keys(sdata);
 527                 drv_remove_interface(local, &conf);
 528         }
 529
 530         sdata->bss = NULL;
 531
 532         hw_reconf_flags |= __ieee80211_recalc_idle(local);
 533
 534         ieee80211_recalc_ps(local, -1);
 535
 536         if (local->open_count == 0) {
 537                 drv_stop(local);
 538
 539                 ieee80211_led_radio(local, false);
 540
 541                 flush_workqueue(local->hw.workqueue);
 542
 543                 tasklet_disable(&local->tx_pending_tasklet);
 544                 tasklet_disable(&local->tasklet);
 545
 546                 /* no reconfiguring after stop! */
 547                 hw_reconf_flags = 0;
 548         }
 549
 550         /* do after stop to avoid reconfiguring when we stop anyway */
 551         if (hw_reconf_flags)
 552                 ieee80211_hw_config(local, hw_reconf_flags);
 553
 554         return 0;
 555 }
 556
 557 static void ieee80211_set_multicast_list(struct net_device *dev)
 558 {
 559         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 560         struct ieee80211_local *local = sdata->local;
 561         int allmulti, promisc, sdata_allmulti, sdata_promisc;
 562
 563         allmulti = !!(dev->flags & IFF_ALLMULTI);
 564         promisc = !!(dev->flags & IFF_PROMISC);
 565         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
 566         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
 567
 568         if (allmulti != sdata_allmulti) {
 569                 if (dev->flags & IFF_ALLMULTI)
 570                         atomic_inc(&local->iff_allmultis);
 571                 else
 572                         atomic_dec(&local->iff_allmultis);
 573                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
 574         }
 575
 576         if (promisc != sdata_promisc) {
 577                 if (dev->flags & IFF_PROMISC)
 578                         atomic_inc(&local->iff_promiscs);
 579                 else
 580                         atomic_dec(&local->iff_promiscs);
 581                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
 582         }
 583         spin_lock_bh(&local->filter_lock);
 584         __dev_addr_sync(&local->mc_list, &local->mc_count,
 585                         &dev->mc_list, &dev->mc_count);
 586         ieee80211_configure_filter(local);
 587         spin_unlock_bh(&local->filter_lock);
 588 }
 589
 590 /*
 591  * Called when the netdev is removed or, by the code below, before
 592  * the interface type changes.
 593  */
 594 static void ieee80211_teardown_sdata(struct net_device *dev)
 595 {
 596         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 597         struct ieee80211_local *local = sdata->local;
 598         struct beacon_data *beacon;
 599         struct sk_buff *skb;
 600         int flushed;
 601         int i;
 602
 603         /* free extra data */
 604         ieee80211_free_keys(sdata);
 605
 606         ieee80211_debugfs_remove_netdev(sdata);
 607
 608         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
 609                 __skb_queue_purge(&sdata->fragments[i].skb_list);
 610         sdata->fragment_next = 0;
 611
 612         switch (sdata->vif.type) {
 613         case NL80211_IFTYPE_AP:
 614                 beacon = sdata->u.ap.beacon;
 615                 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
 616                 synchronize_rcu();
 617                 kfree(beacon);
 618
 619                 while ((skb = skb_dequeue(&sdata->u.ap.ps_bc_buf))) {
 620                         local->total_ps_buffered--;
 621                         dev_kfree_skb(skb);
 622                 }
 623
 624                 break;
 625         case NL80211_IFTYPE_MESH_POINT:
 626                 if (ieee80211_vif_is_mesh(&sdata->vif))
 627                         mesh_rmc_free(sdata);
 628                 break;
 629         case NL80211_IFTYPE_ADHOC:
 630                 if (WARN_ON(sdata->u.ibss.presp))
 631                         kfree_skb(sdata->u.ibss.presp);
 632                 break;
 633         case NL80211_IFTYPE_STATION:
 634         case NL80211_IFTYPE_WDS:
 635         case NL80211_IFTYPE_AP_VLAN:
 636         case NL80211_IFTYPE_MONITOR:
 637                 break;
 638         case NL80211_IFTYPE_UNSPECIFIED:
 639         case __NL80211_IFTYPE_AFTER_LAST:
 640                 BUG();
 641                 break;
 642         }
 643
 644         flushed = sta_info_flush(local, sdata);
 645         WARN_ON(flushed);
 646 }
 647
 648 static const struct net_device_ops ieee80211_dataif_ops = {
 649         .ndo_open               = ieee80211_open,
 650         .ndo_stop               = ieee80211_stop,
 651         .ndo_uninit             = ieee80211_teardown_sdata,
 652         .ndo_start_xmit         = ieee80211_subif_start_xmit,
 653         .ndo_set_multicast_list = ieee80211_set_multicast_list,
 654         .ndo_change_mtu         = ieee80211_change_mtu,
 655         .ndo_set_mac_address    = eth_mac_addr,
 656 };
 657
 658 static const struct net_device_ops ieee80211_monitorif_ops = {
 659         .ndo_open               = ieee80211_open,
 660         .ndo_stop               = ieee80211_stop,
 661         .ndo_uninit             = ieee80211_teardown_sdata,
 662         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
 663         .ndo_set_multicast_list = ieee80211_set_multicast_list,
 664         .ndo_change_mtu         = ieee80211_change_mtu,
 665         .ndo_set_mac_address    = eth_mac_addr,
 666 };
 667
 668 static void ieee80211_if_setup(struct net_device *dev)
 669 {
 670         ether_setup(dev);
 671         dev->netdev_ops = &ieee80211_dataif_ops;
 672         dev->wireless_handlers = &ieee80211_iw_handler_def;
 673         dev->destructor = free_netdev;
 674 }
 675
 676 /*
 677  * Helper function to initialise an interface to a specific type.
 678  */
 679 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
 680                                   enum nl80211_iftype type)
 681 {
 682         /* clear type-dependent union */
 683         memset(&sdata->u, 0, sizeof(sdata->u));
 684
 685         /* and set some type-dependent values */
 686         sdata->vif.type = type;
 687         sdata->dev->netdev_ops = &ieee80211_dataif_ops;
 688         sdata->wdev.iftype = type;
 689
 690         /* only monitor differs */
 691         sdata->dev->type = ARPHRD_ETHER;
 692
 693         switch (type) {
 694         case NL80211_IFTYPE_AP:
 695                 skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
 696                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
 697                 break;
 698         case NL80211_IFTYPE_STATION:
 699                 ieee80211_sta_setup_sdata(sdata);
 700                 break;
 701         case NL80211_IFTYPE_ADHOC:
 702                 ieee80211_ibss_setup_sdata(sdata);
 703                 break;
 704         case NL80211_IFTYPE_MESH_POINT:
 705                 if (ieee80211_vif_is_mesh(&sdata->vif))
 706                         ieee80211_mesh_init_sdata(sdata);
 707                 break;
 708         case NL80211_IFTYPE_MONITOR:
 709                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
 710                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
 711                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
 712                                       MONITOR_FLAG_OTHER_BSS;
 713                 break;
 714         case NL80211_IFTYPE_WDS:
 715         case NL80211_IFTYPE_AP_VLAN:
 716                 break;
 717         case NL80211_IFTYPE_UNSPECIFIED:
 718         case __NL80211_IFTYPE_AFTER_LAST:
 719                 BUG();
 720                 break;
 721         }
 722
 723         ieee80211_debugfs_add_netdev(sdata);
 724 }
 725
 726 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
 727                              enum nl80211_iftype type)
 728 {
 729         ASSERT_RTNL();
 730
 731         if (type == sdata->vif.type)
 732                 return 0;
 733
 734         /* Setting ad-hoc mode on non-IBSS channel is not supported. */
 735         if (sdata->local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS &&
 736             type == NL80211_IFTYPE_ADHOC)
 737                 return -EOPNOTSUPP;
 738
 739         /*
 740          * We could, here, on changes between IBSS/STA/MESH modes,
 741          * invoke an MLME function instead that disassociates etc.
 742          * and goes into the requested mode.
 743          */
 744
 745         if (netif_running(sdata->dev))
 746                 return -EBUSY;
 747
 748         /* Purge and reset type-dependent state. */
 749         ieee80211_teardown_sdata(sdata->dev);
 750         ieee80211_setup_sdata(sdata, type);
 751
 752         /* reset some values that shouldn't be kept across type changes */
 753         sdata->vif.bss_conf.basic_rates =
 754                 ieee80211_mandatory_rates(sdata->local,
 755                         sdata->local->hw.conf.channel->band);
 756         sdata->drop_unencrypted = 0;
 757
 758         return 0;
 759 }
 760
 761 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
 762                      struct net_device **new_dev, enum nl80211_iftype type,
 763                      struct vif_params *params)
 764 {
 765         struct net_device *ndev;
 766         struct ieee80211_sub_if_data *sdata = NULL;
 767         int ret, i;
 768
 769         ASSERT_RTNL();
 770
 771         ndev = alloc_netdev(sizeof(*sdata) + local->hw.vif_data_size,
 772                             name, ieee80211_if_setup);
 773         if (!ndev)
 774                 return -ENOMEM;
 775
 776         ndev->needed_headroom = local->tx_headroom +
 777                                 4*6 /* four MAC addresses */
 778                                 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
 779                                 + 6 /* mesh */
 780                                 + 8 /* rfc1042/bridge tunnel */
 781                                 - ETH_HLEN /* ethernet hard_header_len */
 782                                 + IEEE80211_ENCRYPT_HEADROOM;
 783         ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
 784
 785         ret = dev_alloc_name(ndev, ndev->name);
 786         if (ret < 0)
 787                 goto fail;
 788
 789         memcpy(ndev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
 790         SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
 791         ndev->features |= NETIF_F_NETNS_LOCAL;
 792
 793         /* don't use IEEE80211_DEV_TO_SUB_IF because it checks too much */
 794         sdata = netdev_priv(ndev);
 795         ndev->ieee80211_ptr = &sdata->wdev;
 796
 797         /* initialise type-independent data */
 798         sdata->wdev.wiphy = local->hw.wiphy;
 799         sdata->local = local;
 800         sdata->dev = ndev;
 801
 802         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
 803                 skb_queue_head_init(&sdata->fragments[i].skb_list);
 804
 805         INIT_LIST_HEAD(&sdata->key_list);
 806
 807         sdata->force_unicast_rateidx = -1;
 808         sdata->max_ratectrl_rateidx = -1;
 809
 810         /* setup type-dependent data */
 811         ieee80211_setup_sdata(sdata, type);
 812
 813         ret = register_netdevice(ndev);
 814         if (ret)
 815                 goto fail;
 816
 817         if (ieee80211_vif_is_mesh(&sdata->vif) &&
 818             params && params->mesh_id_len)
 819                 ieee80211_sdata_set_mesh_id(sdata,
 820                                             params->mesh_id_len,
 821                                             params->mesh_id);
 822
 823         mutex_lock(&local->iflist_mtx);
 824         list_add_tail_rcu(&sdata->list, &local->interfaces);
 825         mutex_unlock(&local->iflist_mtx);
 826
 827         if (new_dev)
 828                 *new_dev = ndev;
 829
 830         return 0;
 831
 832  fail:
 833         free_netdev(ndev);
 834         return ret;
 835 }
 836
 837 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
 838 {
 839         ASSERT_RTNL();
 840
 841         mutex_lock(&sdata->local->iflist_mtx);
 842         list_del_rcu(&sdata->list);
 843         mutex_unlock(&sdata->local->iflist_mtx);
 844
 845         synchronize_rcu();
 846         unregister_netdevice(sdata->dev);
 847 }
 848
 849 /*
 850  * Remove all interfaces, may only be called at hardware unregistration
 851  * time because it doesn't do RCU-safe list removals.
 852  */
 853 void ieee80211_remove_interfaces(struct ieee80211_local *local)
 854 {
 855         struct ieee80211_sub_if_data *sdata, *tmp;
 856
 857         ASSERT_RTNL();
 858
 859         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
 860                 /*
 861                  * we cannot hold the iflist_mtx across unregister_netdevice,
 862                  * but we only need to hold it for list modifications to lock
 863                  * out readers since we're under the RTNL here as all other
 864                  * writers.
 865                  */
 866                 mutex_lock(&local->iflist_mtx);
 867                 list_del(&sdata->list);
 868                 mutex_unlock(&local->iflist_mtx);
 869
 870                 unregister_netdevice(sdata->dev);
 871         }
 872 }
 873
 874 static u32 ieee80211_idle_off(struct ieee80211_local *local,
 875                               const char *reason)
 876 {
 877         if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
 878                 return 0;
 879
 880 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 881         printk(KERN_DEBUG "%s: device no longer idle - %s\n",
 882                wiphy_name(local->hw.wiphy), reason);
 883 #endif
 884
 885         local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
 886         return IEEE80211_CONF_CHANGE_IDLE;
 887 }
 888
 889 static u32 ieee80211_idle_on(struct ieee80211_local *local)
 890 {
 891         if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
 892                 return 0;
 893
 894 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 895         printk(KERN_DEBUG "%s: device now idle\n",
 896                wiphy_name(local->hw.wiphy));
 897 #endif
 898
 899         local->hw.conf.flags |= IEEE80211_CONF_IDLE;
 900         return IEEE80211_CONF_CHANGE_IDLE;
 901 }
 902
 903 u32 __ieee80211_recalc_idle(struct ieee80211_local *local)
 904 {
 905         struct ieee80211_sub_if_data *sdata;
 906         int count = 0;
 907
 908         if (local->hw_scanning || local->sw_scanning)
 909                 return ieee80211_idle_off(local, "scanning");
 910
 911         list_for_each_entry(sdata, &local->interfaces, list) {
 912                 if (!netif_running(sdata->dev))
 913                         continue;
 914                 /* do not count disabled managed interfaces */
 915                 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
 916                     !sdata->u.mgd.associated &&
 917                     list_empty(&sdata->u.mgd.work_list))
 918                         continue;
 919                 /* do not count unused IBSS interfaces */
 920                 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
 921                     !sdata->u.ibss.ssid_len)
 922                         continue;
 923                 /* count everything else */
 924                 count++;
 925         }
 926
 927         if (!count)
 928                 return ieee80211_idle_on(local);
 929         else
 930                 return ieee80211_idle_off(local, "in use");
 931
 932         return 0;
 933 }
 934
 935 void ieee80211_recalc_idle(struct ieee80211_local *local)
 936 {
 937         u32 chg;
 938
 939         mutex_lock(&local->iflist_mtx);
 940         chg = __ieee80211_recalc_idle(local);
 941         mutex_unlock(&local->iflist_mtx);
 942         if (chg)
 943                 ieee80211_hw_config(local, chg);
 944 }