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                         memcpy(ndev->perm_addr, ndev->dev_addr, ETH_ALEN);
 192                 }
 193         }
 194
 195         /*
 196          * Validate the MAC address for this device.
 197          */
 198         if (!is_valid_ether_addr(dev->dev_addr)) {
 199                 if (!local->open_count)
 200                         drv_stop(local);
 201                 return -EADDRNOTAVAIL;
 202         }
 203
 204         switch (sdata->vif.type) {
 205         case NL80211_IFTYPE_AP_VLAN:
 206                 /* no need to tell driver */
 207                 break;
 208         case NL80211_IFTYPE_MONITOR:
 209                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 210                         local->cooked_mntrs++;
 211                         break;
 212                 }
 213
 214                 /* must be before the call to ieee80211_configure_filter */
 215                 local->monitors++;
 216                 if (local->monitors == 1) {
 217                         local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
 218                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 219                 }
 220
 221                 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
 222                         local->fif_fcsfail++;
 223                 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
 224                         local->fif_plcpfail++;
 225                 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL) {
 226                         local->fif_control++;
 227                         local->fif_pspoll++;
 228                 }
 229                 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
 230                         local->fif_other_bss++;
 231
 232                 ieee80211_configure_filter(local);
 233                 break;
 234         default:
 235                 conf.vif = &sdata->vif;
 236                 conf.type = sdata->vif.type;
 237                 conf.mac_addr = dev->dev_addr;
 238                 res = drv_add_interface(local, &conf);
 239                 if (res)
 240                         goto err_stop;
 241
 242                 if (ieee80211_vif_is_mesh(&sdata->vif)) {
 243                         local->fif_other_bss++;
 244                         ieee80211_configure_filter(local);
 245
 246                         ieee80211_start_mesh(sdata);
 247                 } else if (sdata->vif.type == NL80211_IFTYPE_AP) {
 248                         local->fif_pspoll++;
 249
 250                         ieee80211_configure_filter(local);
 251                 }
 252
 253                 changed |= ieee80211_reset_erp_info(sdata);
 254                 ieee80211_bss_info_change_notify(sdata, changed);
 255                 ieee80211_enable_keys(sdata);
 256
 257                 if (sdata->vif.type == NL80211_IFTYPE_STATION)
 258                         netif_carrier_off(dev);
 259                 else
 260                         netif_carrier_on(dev);
 261         }
 262
 263         if (sdata->vif.type == NL80211_IFTYPE_WDS) {
 264                 /* Create STA entry for the WDS peer */
 265                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
 266                                      GFP_KERNEL);
 267                 if (!sta) {
 268                         res = -ENOMEM;
 269                         goto err_del_interface;
 270                 }
 271
 272                 /* no locking required since STA is not live yet */
 273                 sta->flags |= WLAN_STA_AUTHORIZED;
 274
 275                 res = sta_info_insert(sta);
 276                 if (res) {
 277                         /* STA has been freed */
 278                         goto err_del_interface;
 279                 }
 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                 ieee80211_queue_work(&local->hw, &sdata->u.mgd.work);
 316
 317         netif_start_queue(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         unsigned long flags;
 339         struct sk_buff *skb, *tmp;
 340         u32 hw_reconf_flags = 0;
 341         int i;
 342
 343         /*
 344          * Stop TX on this interface first.
 345          */
 346         netif_stop_queue(dev);
 347
 348         /*
 349          * Now delete all active aggregation sessions.
 350          */
 351         rcu_read_lock();
 352
 353         list_for_each_entry_rcu(sta, &local->sta_list, list) {
 354                 if (sta->sdata == sdata)
 355                         ieee80211_sta_tear_down_BA_sessions(sta);
 356         }
 357
 358         rcu_read_unlock();
 359
 360         /*
 361          * Remove all stations associated with this interface.
 362          *
 363          * This must be done before calling ops->remove_interface()
 364          * because otherwise we can later invoke ops->sta_notify()
 365          * whenever the STAs are removed, and that invalidates driver
 366          * assumptions about always getting a vif pointer that is valid
 367          * (because if we remove a STA after ops->remove_interface()
 368          * the driver will have removed the vif info already!)
 369          *
 370          * We could relax this and only unlink the stations from the
 371          * hash table and list but keep them on a per-sdata list that
 372          * will be inserted back again when the interface is brought
 373          * up again, but I don't currently see a use case for that,
 374          * except with WDS which gets a STA entry created when it is
 375          * brought up.
 376          */
 377         sta_info_flush(local, sdata);
 378
 379         /*
 380          * Don't count this interface for promisc/allmulti while it
 381          * is down. dev_mc_unsync() will invoke set_multicast_list
 382          * on the master interface which will sync these down to the
 383          * hardware as filter flags.
 384          */
 385         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 386                 atomic_dec(&local->iff_allmultis);
 387
 388         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 389                 atomic_dec(&local->iff_promiscs);
 390
 391         if (sdata->vif.type == NL80211_IFTYPE_AP)
 392                 local->fif_pspoll--;
 393
 394         netif_addr_lock_bh(dev);
 395         spin_lock_bh(&local->filter_lock);
 396         __dev_addr_unsync(&local->mc_list, &local->mc_count,
 397                           &dev->mc_list, &dev->mc_count);
 398         spin_unlock_bh(&local->filter_lock);
 399         netif_addr_unlock_bh(dev);
 400
 401         ieee80211_configure_filter(local);
 402
 403         del_timer_sync(&local->dynamic_ps_timer);
 404         cancel_work_sync(&local->dynamic_ps_enable_work);
 405
 406         /* APs need special treatment */
 407         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 408                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
 409                 struct beacon_data *old_beacon = sdata->u.ap.beacon;
 410
 411                 /* remove beacon */
 412                 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
 413                 synchronize_rcu();
 414                 kfree(old_beacon);
 415
 416                 /* down all dependent devices, that is VLANs */
 417                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
 418                                          u.vlan.list)
 419                         dev_close(vlan->dev);
 420                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
 421         }
 422
 423         local->open_count--;
 424
 425         switch (sdata->vif.type) {
 426         case NL80211_IFTYPE_AP_VLAN:
 427                 list_del(&sdata->u.vlan.list);
 428                 /* no need to tell driver */
 429                 break;
 430         case NL80211_IFTYPE_MONITOR:
 431                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 432                         local->cooked_mntrs--;
 433                         break;
 434                 }
 435
 436                 local->monitors--;
 437                 if (local->monitors == 0) {
 438                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
 439                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 440                 }
 441
 442                 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
 443                         local->fif_fcsfail--;
 444                 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
 445                         local->fif_plcpfail--;
 446                 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL) {
 447                         local->fif_pspoll--;
 448                         local->fif_control--;
 449                 }
 450                 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
 451                         local->fif_other_bss--;
 452
 453                 ieee80211_configure_filter(local);
 454                 break;
 455         case NL80211_IFTYPE_STATION:
 456                 del_timer_sync(&sdata->u.mgd.chswitch_timer);
 457                 del_timer_sync(&sdata->u.mgd.timer);
 458                 del_timer_sync(&sdata->u.mgd.conn_mon_timer);
 459                 del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
 460                 /*
 461                  * If any of the timers fired while we waited for it, it will
 462                  * have queued its work. Now the work will be running again
 463                  * but will not rearm the timer again because it checks
 464                  * whether the interface is running, which, at this point,
 465                  * it no longer is.
 466                  */
 467                 cancel_work_sync(&sdata->u.mgd.work);
 468                 cancel_work_sync(&sdata->u.mgd.chswitch_work);
 469                 cancel_work_sync(&sdata->u.mgd.monitor_work);
 470                 cancel_work_sync(&sdata->u.mgd.beacon_loss_work);
 471
 472                 /*
 473                  * When we get here, the interface is marked down.
 474                  * Call synchronize_rcu() to wait for the RX path
 475                  * should it be using the interface and enqueuing
 476                  * frames at this very time on another CPU.
 477                  */
 478                 synchronize_rcu();
 479                 skb_queue_purge(&sdata->u.mgd.skb_queue);
 480                 /* fall through */
 481         case NL80211_IFTYPE_ADHOC:
 482                 if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 483                         del_timer_sync(&sdata->u.ibss.timer);
 484                         cancel_work_sync(&sdata->u.ibss.work);
 485                         synchronize_rcu();
 486                         skb_queue_purge(&sdata->u.ibss.skb_queue);
 487                 }
 488                 /* fall through */
 489         case NL80211_IFTYPE_MESH_POINT:
 490                 if (ieee80211_vif_is_mesh(&sdata->vif)) {
 491                         /* other_bss and allmulti are always set on mesh
 492                          * ifaces */
 493                         local->fif_other_bss--;
 494                         atomic_dec(&local->iff_allmultis);
 495
 496                         ieee80211_configure_filter(local);
 497
 498                         ieee80211_stop_mesh(sdata);
 499                 }
 500                 /* fall through */
 501         default:
 502                 if (local->scan_sdata == sdata)
 503                         ieee80211_scan_cancel(local);
 504
 505                 /*
 506                  * Disable beaconing for AP and mesh, IBSS can't
 507                  * still be joined to a network at this point.
 508                  */
 509                 if (sdata->vif.type == NL80211_IFTYPE_AP ||
 510                     sdata->vif.type == NL80211_IFTYPE_MESH_POINT) {
 511                         ieee80211_bss_info_change_notify(sdata,
 512                                 BSS_CHANGED_BEACON_ENABLED);
 513                 }
 514
 515                 conf.vif = &sdata->vif;
 516                 conf.type = sdata->vif.type;
 517                 conf.mac_addr = dev->dev_addr;
 518                 /* disable all keys for as long as this netdev is down */
 519                 ieee80211_disable_keys(sdata);
 520                 drv_remove_interface(local, &conf);
 521         }
 522
 523         sdata->bss = NULL;
 524
 525         hw_reconf_flags |= __ieee80211_recalc_idle(local);
 526
 527         ieee80211_recalc_ps(local, -1);
 528
 529         if (local->open_count == 0) {
 530                 ieee80211_clear_tx_pending(local);
 531                 ieee80211_stop_device(local);
 532
 533                 /* no reconfiguring after stop! */
 534                 hw_reconf_flags = 0;
 535         }
 536
 537         /* do after stop to avoid reconfiguring when we stop anyway */
 538         if (hw_reconf_flags)
 539                 ieee80211_hw_config(local, hw_reconf_flags);
 540
 541         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 542         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 543                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
 544                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 545                         if (info->control.vif == &sdata->vif) {
 546                                 __skb_unlink(skb, &local->pending[i]);
 547                                 dev_kfree_skb_irq(skb);
 548                         }
 549                 }
 550         }
 551         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 552
 553         return 0;
 554 }
 555
 556 static void ieee80211_set_multicast_list(struct net_device *dev)
 557 {
 558         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 559         struct ieee80211_local *local = sdata->local;
 560         int allmulti, promisc, sdata_allmulti, sdata_promisc;
 561
 562         allmulti = !!(dev->flags & IFF_ALLMULTI);
 563         promisc = !!(dev->flags & IFF_PROMISC);
 564         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
 565         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
 566
 567         if (allmulti != sdata_allmulti) {
 568                 if (dev->flags & IFF_ALLMULTI)
 569                         atomic_inc(&local->iff_allmultis);
 570                 else
 571                         atomic_dec(&local->iff_allmultis);
 572                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
 573         }
 574
 575         if (promisc != sdata_promisc) {
 576                 if (dev->flags & IFF_PROMISC)
 577                         atomic_inc(&local->iff_promiscs);
 578                 else
 579                         atomic_dec(&local->iff_promiscs);
 580                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
 581         }
 582         spin_lock_bh(&local->filter_lock);
 583         __dev_addr_sync(&local->mc_list, &local->mc_count,
 584                         &dev->mc_list, &dev->mc_count);
 585         spin_unlock_bh(&local->filter_lock);
 586         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
 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->destructor = free_netdev;
 672 }
 673
 674 /*
 675  * Helper function to initialise an interface to a specific type.
 676  */
 677 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
 678                                   enum nl80211_iftype type)
 679 {
 680         /* clear type-dependent union */
 681         memset(&sdata->u, 0, sizeof(sdata->u));
 682
 683         /* and set some type-dependent values */
 684         sdata->vif.type = type;
 685         sdata->dev->netdev_ops = &ieee80211_dataif_ops;
 686         sdata->wdev.iftype = type;
 687
 688         /* only monitor differs */
 689         sdata->dev->type = ARPHRD_ETHER;
 690
 691         switch (type) {
 692         case NL80211_IFTYPE_AP:
 693                 skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
 694                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
 695                 break;
 696         case NL80211_IFTYPE_STATION:
 697                 ieee80211_sta_setup_sdata(sdata);
 698                 break;
 699         case NL80211_IFTYPE_ADHOC:
 700                 ieee80211_ibss_setup_sdata(sdata);
 701                 break;
 702         case NL80211_IFTYPE_MESH_POINT:
 703                 if (ieee80211_vif_is_mesh(&sdata->vif))
 704                         ieee80211_mesh_init_sdata(sdata);
 705                 break;
 706         case NL80211_IFTYPE_MONITOR:
 707                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
 708                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
 709                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
 710                                       MONITOR_FLAG_OTHER_BSS;
 711                 break;
 712         case NL80211_IFTYPE_WDS:
 713         case NL80211_IFTYPE_AP_VLAN:
 714                 break;
 715         case NL80211_IFTYPE_UNSPECIFIED:
 716         case __NL80211_IFTYPE_AFTER_LAST:
 717                 BUG();
 718                 break;
 719         }
 720
 721         ieee80211_debugfs_add_netdev(sdata);
 722 }
 723
 724 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
 725                              enum nl80211_iftype type)
 726 {
 727         ASSERT_RTNL();
 728
 729         if (type == sdata->vif.type)
 730                 return 0;
 731
 732         /* Setting ad-hoc mode on non-IBSS channel is not supported. */
 733         if (sdata->local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS &&
 734             type == NL80211_IFTYPE_ADHOC)
 735                 return -EOPNOTSUPP;
 736
 737         /*
 738          * We could, here, on changes between IBSS/STA/MESH modes,
 739          * invoke an MLME function instead that disassociates etc.
 740          * and goes into the requested mode.
 741          */
 742
 743         if (netif_running(sdata->dev))
 744                 return -EBUSY;
 745
 746         /* Purge and reset type-dependent state. */
 747         ieee80211_teardown_sdata(sdata->dev);
 748         ieee80211_setup_sdata(sdata, type);
 749
 750         /* reset some values that shouldn't be kept across type changes */
 751         sdata->vif.bss_conf.basic_rates =
 752                 ieee80211_mandatory_rates(sdata->local,
 753                         sdata->local->hw.conf.channel->band);
 754         sdata->drop_unencrypted = 0;
 755         if (type == NL80211_IFTYPE_STATION)
 756                 sdata->u.mgd.use_4addr = false;
 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         dev_net_set(ndev, wiphy_net(local->hw.wiphy));
 776
 777         ndev->needed_headroom = local->tx_headroom +
 778                                 4*6 /* four MAC addresses */
 779                                 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
 780                                 + 6 /* mesh */
 781                                 + 8 /* rfc1042/bridge tunnel */
 782                                 - ETH_HLEN /* ethernet hard_header_len */
 783                                 + IEEE80211_ENCRYPT_HEADROOM;
 784         ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
 785
 786         ret = dev_alloc_name(ndev, ndev->name);
 787         if (ret < 0)
 788                 goto fail;
 789
 790         memcpy(ndev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
 791         memcpy(ndev->perm_addr, ndev->dev_addr, ETH_ALEN);
 792         SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
 793
 794         /* don't use IEEE80211_DEV_TO_SUB_IF because it checks too much */
 795         sdata = netdev_priv(ndev);
 796         ndev->ieee80211_ptr = &sdata->wdev;
 797
 798         /* initialise type-independent data */
 799         sdata->wdev.wiphy = local->hw.wiphy;
 800         sdata->local = local;
 801         sdata->dev = ndev;
 802
 803         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
 804                 skb_queue_head_init(&sdata->fragments[i].skb_list);
 805
 806         INIT_LIST_HEAD(&sdata->key_list);
 807
 808         sdata->force_unicast_rateidx = -1;
 809         sdata->max_ratectrl_rateidx = -1;
 810
 811         /* setup type-dependent data */
 812         ieee80211_setup_sdata(sdata, type);
 813
 814         if (params) {
 815                 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
 816                 if (type == NL80211_IFTYPE_STATION)
 817                         sdata->u.mgd.use_4addr = params->use_4addr;
 818         }
 819
 820         ret = register_netdevice(ndev);
 821         if (ret)
 822                 goto fail;
 823
 824         if (ieee80211_vif_is_mesh(&sdata->vif) &&
 825             params && params->mesh_id_len)
 826                 ieee80211_sdata_set_mesh_id(sdata,
 827                                             params->mesh_id_len,
 828                                             params->mesh_id);
 829
 830         mutex_lock(&local->iflist_mtx);
 831         list_add_tail_rcu(&sdata->list, &local->interfaces);
 832         mutex_unlock(&local->iflist_mtx);
 833
 834         if (new_dev)
 835                 *new_dev = ndev;
 836
 837         return 0;
 838
 839  fail:
 840         free_netdev(ndev);
 841         return ret;
 842 }
 843
 844 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
 845 {
 846         ASSERT_RTNL();
 847
 848         mutex_lock(&sdata->local->iflist_mtx);
 849         list_del_rcu(&sdata->list);
 850         mutex_unlock(&sdata->local->iflist_mtx);
 851
 852         synchronize_rcu();
 853         unregister_netdevice(sdata->dev);
 854 }
 855
 856 /*
 857  * Remove all interfaces, may only be called at hardware unregistration
 858  * time because it doesn't do RCU-safe list removals.
 859  */
 860 void ieee80211_remove_interfaces(struct ieee80211_local *local)
 861 {
 862         struct ieee80211_sub_if_data *sdata, *tmp;
 863
 864         ASSERT_RTNL();
 865
 866         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
 867                 /*
 868                  * we cannot hold the iflist_mtx across unregister_netdevice,
 869                  * but we only need to hold it for list modifications to lock
 870                  * out readers since we're under the RTNL here as all other
 871                  * writers.
 872                  */
 873                 mutex_lock(&local->iflist_mtx);
 874                 list_del(&sdata->list);
 875                 mutex_unlock(&local->iflist_mtx);
 876
 877                 unregister_netdevice(sdata->dev);
 878         }
 879 }
 880
 881 static u32 ieee80211_idle_off(struct ieee80211_local *local,
 882                               const char *reason)
 883 {
 884         if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
 885                 return 0;
 886
 887 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 888         printk(KERN_DEBUG "%s: device no longer idle - %s\n",
 889                wiphy_name(local->hw.wiphy), reason);
 890 #endif
 891
 892         local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
 893         return IEEE80211_CONF_CHANGE_IDLE;
 894 }
 895
 896 static u32 ieee80211_idle_on(struct ieee80211_local *local)
 897 {
 898         if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
 899                 return 0;
 900
 901 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 902         printk(KERN_DEBUG "%s: device now idle\n",
 903                wiphy_name(local->hw.wiphy));
 904 #endif
 905
 906         local->hw.conf.flags |= IEEE80211_CONF_IDLE;
 907         return IEEE80211_CONF_CHANGE_IDLE;
 908 }
 909
 910 u32 __ieee80211_recalc_idle(struct ieee80211_local *local)
 911 {
 912         struct ieee80211_sub_if_data *sdata;
 913         int count = 0;
 914
 915         if (local->scanning)
 916                 return ieee80211_idle_off(local, "scanning");
 917
 918         list_for_each_entry(sdata, &local->interfaces, list) {
 919                 if (!netif_running(sdata->dev))
 920                         continue;
 921                 /* do not count disabled managed interfaces */
 922                 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
 923                     !sdata->u.mgd.associated &&
 924                     list_empty(&sdata->u.mgd.work_list))
 925                         continue;
 926                 /* do not count unused IBSS interfaces */
 927                 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
 928                     !sdata->u.ibss.ssid_len)
 929                         continue;
 930                 /* count everything else */
 931                 count++;
 932         }
 933
 934         if (!count)
 935                 return ieee80211_idle_on(local);
 936         else
 937                 return ieee80211_idle_off(local, "in use");
 938
 939         return 0;
 940 }
 941
 942 void ieee80211_recalc_idle(struct ieee80211_local *local)
 943 {
 944         u32 chg;
 945
 946         mutex_lock(&local->iflist_mtx);
 947         chg = __ieee80211_recalc_idle(local);
 948         mutex_unlock(&local->iflist_mtx);
 949         if (chg)
 950                 ieee80211_hw_config(local, chg);
 951 }