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/slab.h>
  14 #include <linux/kernel.h>
  15 #include <linux/if_arp.h>
  16 #include <linux/netdevice.h>
  17 #include <linux/rtnetlink.h>
  18 #include <net/mac80211.h>
  19 #include <net/ieee80211_radiotap.h>
  20 #include "ieee80211_i.h"
  21 #include "sta_info.h"
  22 #include "debugfs_netdev.h"
  23 #include "mesh.h"
  24 #include "led.h"
  25 #include "driver-ops.h"
  26 #include "wme.h"
  27
  28 /**
  29  * DOC: Interface list locking
  30  *
  31  * The interface list in each struct ieee80211_local is protected
  32  * three-fold:
  33  *
  34  * (1) modifications may only be done under the RTNL
  35  * (2) modifications and readers are protected against each other by
  36  *     the iflist_mtx.
  37  * (3) modifications are done in an RCU manner so atomic readers
  38  *     can traverse the list in RCU-safe blocks.
  39  *
  40  * As a consequence, reads (traversals) of the list can be protected
  41  * by either the RTNL, the iflist_mtx or RCU.
  42  */
  43
  44
  45 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
  46 {
  47         int meshhdrlen;
  48         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
  49
  50         meshhdrlen = (sdata->vif.type == NL80211_IFTYPE_MESH_POINT) ? 5 : 0;
  51
  52         /* FIX: what would be proper limits for MTU?
  53          * This interface uses 802.3 frames. */
  54         if (new_mtu < 256 ||
  55             new_mtu > IEEE80211_MAX_DATA_LEN - 24 - 6 - meshhdrlen) {
  56                 return -EINVAL;
  57         }
  58
  59 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
  60         printk(KERN_DEBUG "%s: setting MTU %d\n", dev->name, new_mtu);
  61 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
  62         dev->mtu = new_mtu;
  63         return 0;
  64 }
  65
  66 static int ieee80211_change_mac(struct net_device *dev, void *addr)
  67 {
  68         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
  69         struct sockaddr *sa = addr;
  70         int ret;
  71
  72         if (ieee80211_sdata_running(sdata))
  73                 return -EBUSY;
  74
  75         ret = eth_mac_addr(dev, sa);
  76
  77         if (ret == 0)
  78                 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
  79
  80         return ret;
  81 }
  82
  83 static inline int identical_mac_addr_allowed(int type1, int type2)
  84 {
  85         return type1 == NL80211_IFTYPE_MONITOR ||
  86                 type2 == NL80211_IFTYPE_MONITOR ||
  87                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
  88                 (type1 == NL80211_IFTYPE_WDS &&
  89                         (type2 == NL80211_IFTYPE_WDS ||
  90                          type2 == NL80211_IFTYPE_AP)) ||
  91                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
  92                 (type1 == NL80211_IFTYPE_AP_VLAN &&
  93                         (type2 == NL80211_IFTYPE_AP ||
  94                          type2 == NL80211_IFTYPE_AP_VLAN));
  95 }
  96
  97 static int ieee80211_open(struct net_device *dev)
  98 {
  99         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 100         struct ieee80211_sub_if_data *nsdata;
 101         struct ieee80211_local *local = sdata->local;
 102         struct sta_info *sta;
 103         u32 changed = 0;
 104         int res;
 105         u32 hw_reconf_flags = 0;
 106         u8 null_addr[ETH_ALEN] = {0};
 107
 108         /* fail early if user set an invalid address */
 109         if (compare_ether_addr(dev->dev_addr, null_addr) &&
 110             !is_valid_ether_addr(dev->dev_addr))
 111                 return -EADDRNOTAVAIL;
 112
 113         /* we hold the RTNL here so can safely walk the list */
 114         list_for_each_entry(nsdata, &local->interfaces, list) {
 115                 struct net_device *ndev = nsdata->dev;
 116
 117                 if (ndev != dev && ieee80211_sdata_running(nsdata)) {
 118                         /*
 119                          * Allow only a single IBSS interface to be up at any
 120                          * time. This is restricted because beacon distribution
 121                          * cannot work properly if both are in the same IBSS.
 122                          *
 123                          * To remove this restriction we'd have to disallow them
 124                          * from setting the same SSID on different IBSS interfaces
 125                          * belonging to the same hardware. Then, however, we're
 126                          * faced with having to adopt two different TSF timers...
 127                          */
 128                         if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
 129                             nsdata->vif.type == NL80211_IFTYPE_ADHOC)
 130                                 return -EBUSY;
 131
 132                         /*
 133                          * The remaining checks are only performed for interfaces
 134                          * with the same MAC address.
 135                          */
 136                         if (compare_ether_addr(dev->dev_addr, ndev->dev_addr))
 137                                 continue;
 138
 139                         /*
 140                          * check whether it may have the same address
 141                          */
 142                         if (!identical_mac_addr_allowed(sdata->vif.type,
 143                                                         nsdata->vif.type))
 144                                 return -ENOTUNIQ;
 145
 146                         /*
 147                          * can only add VLANs to enabled APs
 148                          */
 149                         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
 150                             nsdata->vif.type == NL80211_IFTYPE_AP)
 151                                 sdata->bss = &nsdata->u.ap;
 152                 }
 153         }
 154
 155         switch (sdata->vif.type) {
 156         case NL80211_IFTYPE_WDS:
 157                 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
 158                         return -ENOLINK;
 159                 break;
 160         case NL80211_IFTYPE_AP_VLAN:
 161                 if (!sdata->bss)
 162                         return -ENOLINK;
 163                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
 164                 break;
 165         case NL80211_IFTYPE_AP:
 166                 sdata->bss = &sdata->u.ap;
 167                 break;
 168         case NL80211_IFTYPE_MESH_POINT:
 169                 if (!ieee80211_vif_is_mesh(&sdata->vif))
 170                         break;
 171                 /* mesh ifaces must set allmulti to forward mcast traffic */
 172                 atomic_inc(&local->iff_allmultis);
 173                 break;
 174         case NL80211_IFTYPE_STATION:
 175         case NL80211_IFTYPE_MONITOR:
 176         case NL80211_IFTYPE_ADHOC:
 177                 /* no special treatment */
 178                 break;
 179         case NL80211_IFTYPE_UNSPECIFIED:
 180         case __NL80211_IFTYPE_AFTER_LAST:
 181                 /* cannot happen */
 182                 WARN_ON(1);
 183                 break;
 184         }
 185
 186         if (local->open_count == 0) {
 187                 res = drv_start(local);
 188                 if (res)
 189                         goto err_del_bss;
 190                 /* we're brought up, everything changes */
 191                 hw_reconf_flags = ~0;
 192                 ieee80211_led_radio(local, true);
 193         }
 194
 195         /*
 196          * Check all interfaces and copy the hopefully now-present
 197          * MAC address to those that have the special null one.
 198          */
 199         list_for_each_entry(nsdata, &local->interfaces, list) {
 200                 struct net_device *ndev = nsdata->dev;
 201
 202                 /*
 203                  * No need to check running since we do not allow
 204                  * it to start up with this invalid address.
 205                  */
 206                 if (compare_ether_addr(null_addr, ndev->dev_addr) == 0) {
 207                         memcpy(ndev->dev_addr,
 208                                local->hw.wiphy->perm_addr,
 209                                ETH_ALEN);
 210                         memcpy(ndev->perm_addr, ndev->dev_addr, ETH_ALEN);
 211                 }
 212         }
 213
 214         /*
 215          * Validate the MAC address for this device.
 216          */
 217         if (!is_valid_ether_addr(dev->dev_addr)) {
 218                 if (!local->open_count)
 219                         drv_stop(local);
 220                 return -EADDRNOTAVAIL;
 221         }
 222
 223         switch (sdata->vif.type) {
 224         case NL80211_IFTYPE_AP_VLAN:
 225                 /* no need to tell driver */
 226                 break;
 227         case NL80211_IFTYPE_MONITOR:
 228                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 229                         local->cooked_mntrs++;
 230                         break;
 231                 }
 232
 233                 /* must be before the call to ieee80211_configure_filter */
 234                 local->monitors++;
 235                 if (local->monitors == 1) {
 236                         local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
 237                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 238                 }
 239
 240                 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
 241                         local->fif_fcsfail++;
 242                 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
 243                         local->fif_plcpfail++;
 244                 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL) {
 245                         local->fif_control++;
 246                         local->fif_pspoll++;
 247                 }
 248                 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
 249                         local->fif_other_bss++;
 250
 251                 ieee80211_configure_filter(local);
 252                 break;
 253         default:
 254                 res = drv_add_interface(local, &sdata->vif);
 255                 if (res)
 256                         goto err_stop;
 257
 258                 if (ieee80211_vif_is_mesh(&sdata->vif)) {
 259                         local->fif_other_bss++;
 260                         ieee80211_configure_filter(local);
 261
 262                         ieee80211_start_mesh(sdata);
 263                 } else if (sdata->vif.type == NL80211_IFTYPE_AP) {
 264                         local->fif_pspoll++;
 265
 266                         ieee80211_configure_filter(local);
 267                 }
 268
 269                 changed |= ieee80211_reset_erp_info(sdata);
 270                 ieee80211_bss_info_change_notify(sdata, changed);
 271
 272                 if (sdata->vif.type == NL80211_IFTYPE_STATION)
 273                         netif_carrier_off(dev);
 274                 else
 275                         netif_carrier_on(dev);
 276         }
 277
 278         if (sdata->vif.type == NL80211_IFTYPE_WDS) {
 279                 /* Create STA entry for the WDS peer */
 280                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
 281                                      GFP_KERNEL);
 282                 if (!sta) {
 283                         res = -ENOMEM;
 284                         goto err_del_interface;
 285                 }
 286
 287                 /* no locking required since STA is not live yet */
 288                 sta->flags |= WLAN_STA_AUTHORIZED;
 289
 290                 res = sta_info_insert(sta);
 291                 if (res) {
 292                         /* STA has been freed */
 293                         goto err_del_interface;
 294                 }
 295         }
 296
 297         /*
 298          * set_multicast_list will be invoked by the networking core
 299          * which will check whether any increments here were done in
 300          * error and sync them down to the hardware as filter flags.
 301          */
 302         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 303                 atomic_inc(&local->iff_allmultis);
 304
 305         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 306                 atomic_inc(&local->iff_promiscs);
 307
 308         hw_reconf_flags |= __ieee80211_recalc_idle(local);
 309
 310         local->open_count++;
 311         if (hw_reconf_flags) {
 312                 ieee80211_hw_config(local, hw_reconf_flags);
 313                 /*
 314                  * set default queue parameters so drivers don't
 315                  * need to initialise the hardware if the hardware
 316                  * doesn't start up with sane defaults
 317                  */
 318                 ieee80211_set_wmm_default(sdata);
 319         }
 320
 321         ieee80211_recalc_ps(local, -1);
 322
 323         netif_tx_start_all_queues(dev);
 324
 325         return 0;
 326  err_del_interface:
 327         drv_remove_interface(local, &sdata->vif);
 328  err_stop:
 329         if (!local->open_count)
 330                 drv_stop(local);
 331  err_del_bss:
 332         sdata->bss = NULL;
 333         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
 334                 list_del(&sdata->u.vlan.list);
 335         return res;
 336 }
 337
 338 static int ieee80211_stop(struct net_device *dev)
 339 {
 340         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 341         struct ieee80211_local *local = sdata->local;
 342         unsigned long flags;
 343         struct sk_buff *skb, *tmp;
 344         u32 hw_reconf_flags = 0;
 345         int i;
 346
 347         /*
 348          * Stop TX on this interface first.
 349          */
 350         netif_tx_stop_all_queues(dev);
 351
 352         /*
 353          * Purge work for this interface.
 354          */
 355         ieee80211_work_purge(sdata);
 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         if (sdata->vif.type == NL80211_IFTYPE_AP)
 389                 local->fif_pspoll--;
 390
 391         netif_addr_lock_bh(dev);
 392         spin_lock_bh(&local->filter_lock);
 393         __hw_addr_unsync(&local->mc_list, &dev->mc, dev->addr_len);
 394         spin_unlock_bh(&local->filter_lock);
 395         netif_addr_unlock_bh(dev);
 396
 397         ieee80211_configure_filter(local);
 398
 399         del_timer_sync(&local->dynamic_ps_timer);
 400         cancel_work_sync(&local->dynamic_ps_enable_work);
 401
 402         /* APs need special treatment */
 403         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 404                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
 405                 struct beacon_data *old_beacon = sdata->u.ap.beacon;
 406
 407                 /* remove beacon */
 408                 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
 409                 synchronize_rcu();
 410                 kfree(old_beacon);
 411
 412                 /* down all dependent devices, that is VLANs */
 413                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
 414                                          u.vlan.list)
 415                         dev_close(vlan->dev);
 416                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
 417         }
 418
 419         local->open_count--;
 420
 421         switch (sdata->vif.type) {
 422         case NL80211_IFTYPE_AP_VLAN:
 423                 list_del(&sdata->u.vlan.list);
 424                 /* no need to tell driver */
 425                 break;
 426         case NL80211_IFTYPE_MONITOR:
 427                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 428                         local->cooked_mntrs--;
 429                         break;
 430                 }
 431
 432                 local->monitors--;
 433                 if (local->monitors == 0) {
 434                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
 435                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 436                 }
 437
 438                 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
 439                         local->fif_fcsfail--;
 440                 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
 441                         local->fif_plcpfail--;
 442                 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL) {
 443                         local->fif_pspoll--;
 444                         local->fif_control--;
 445                 }
 446                 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
 447                         local->fif_other_bss--;
 448
 449                 ieee80211_configure_filter(local);
 450                 break;
 451         case NL80211_IFTYPE_STATION:
 452                 del_timer_sync(&sdata->u.mgd.chswitch_timer);
 453                 del_timer_sync(&sdata->u.mgd.timer);
 454                 del_timer_sync(&sdata->u.mgd.conn_mon_timer);
 455                 del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
 456                 /*
 457                  * If any of the timers fired while we waited for it, it will
 458                  * have queued its work. Now the work will be running again
 459                  * but will not rearm the timer again because it checks
 460                  * whether the interface is running, which, at this point,
 461                  * it no longer is.
 462                  */
 463                 cancel_work_sync(&sdata->u.mgd.chswitch_work);
 464                 cancel_work_sync(&sdata->u.mgd.monitor_work);
 465                 cancel_work_sync(&sdata->u.mgd.beacon_connection_loss_work);
 466
 467                 /* fall through */
 468         case NL80211_IFTYPE_ADHOC:
 469                 if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
 470                         del_timer_sync(&sdata->u.ibss.timer);
 471                 /* fall through */
 472         case NL80211_IFTYPE_MESH_POINT:
 473                 if (ieee80211_vif_is_mesh(&sdata->vif)) {
 474                         /* other_bss and allmulti are always set on mesh
 475                          * ifaces */
 476                         local->fif_other_bss--;
 477                         atomic_dec(&local->iff_allmultis);
 478
 479                         ieee80211_configure_filter(local);
 480
 481                         ieee80211_stop_mesh(sdata);
 482                 }
 483                 /* fall through */
 484         default:
 485                 cancel_work_sync(&sdata->work);
 486                 /*
 487                  * When we get here, the interface is marked down.
 488                  * Call synchronize_rcu() to wait for the RX path
 489                  * should it be using the interface and enqueuing
 490                  * frames at this very time on another CPU.
 491                  */
 492                 synchronize_rcu();
 493                 skb_queue_purge(&sdata->skb_queue);
 494
 495                 if (local->scan_sdata == sdata)
 496                         ieee80211_scan_cancel(local);
 497
 498                 /*
 499                  * Disable beaconing for AP and mesh, IBSS can't
 500                  * still be joined to a network at this point.
 501                  */
 502                 if (sdata->vif.type == NL80211_IFTYPE_AP ||
 503                     sdata->vif.type == NL80211_IFTYPE_MESH_POINT) {
 504                         ieee80211_bss_info_change_notify(sdata,
 505                                 BSS_CHANGED_BEACON_ENABLED);
 506                 }
 507
 508                 /* free all remaining keys, there shouldn't be any */
 509                 ieee80211_free_keys(sdata);
 510                 drv_remove_interface(local, &sdata->vif);
 511         }
 512
 513         sdata->bss = NULL;
 514
 515         hw_reconf_flags |= __ieee80211_recalc_idle(local);
 516
 517         ieee80211_recalc_ps(local, -1);
 518
 519         if (local->open_count == 0) {
 520                 ieee80211_clear_tx_pending(local);
 521                 ieee80211_stop_device(local);
 522
 523                 /* no reconfiguring after stop! */
 524                 hw_reconf_flags = 0;
 525         }
 526
 527         /* do after stop to avoid reconfiguring when we stop anyway */
 528         if (hw_reconf_flags)
 529                 ieee80211_hw_config(local, hw_reconf_flags);
 530
 531         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 532         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 533                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
 534                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 535                         if (info->control.vif == &sdata->vif) {
 536                                 __skb_unlink(skb, &local->pending[i]);
 537                                 dev_kfree_skb_irq(skb);
 538                         }
 539                 }
 540         }
 541         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 542
 543         return 0;
 544 }
 545
 546 static void ieee80211_set_multicast_list(struct net_device *dev)
 547 {
 548         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 549         struct ieee80211_local *local = sdata->local;
 550         int allmulti, promisc, sdata_allmulti, sdata_promisc;
 551
 552         allmulti = !!(dev->flags & IFF_ALLMULTI);
 553         promisc = !!(dev->flags & IFF_PROMISC);
 554         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
 555         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
 556
 557         if (allmulti != sdata_allmulti) {
 558                 if (dev->flags & IFF_ALLMULTI)
 559                         atomic_inc(&local->iff_allmultis);
 560                 else
 561                         atomic_dec(&local->iff_allmultis);
 562                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
 563         }
 564
 565         if (promisc != sdata_promisc) {
 566                 if (dev->flags & IFF_PROMISC)
 567                         atomic_inc(&local->iff_promiscs);
 568                 else
 569                         atomic_dec(&local->iff_promiscs);
 570                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
 571         }
 572         spin_lock_bh(&local->filter_lock);
 573         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
 574         spin_unlock_bh(&local->filter_lock);
 575         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
 576 }
 577
 578 /*
 579  * Called when the netdev is removed or, by the code below, before
 580  * the interface type changes.
 581  */
 582 static void ieee80211_teardown_sdata(struct net_device *dev)
 583 {
 584         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 585         struct ieee80211_local *local = sdata->local;
 586         struct beacon_data *beacon;
 587         struct sk_buff *skb;
 588         int flushed;
 589         int i;
 590
 591         /* free extra data */
 592         ieee80211_free_keys(sdata);
 593
 594         ieee80211_debugfs_remove_netdev(sdata);
 595
 596         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
 597                 __skb_queue_purge(&sdata->fragments[i].skb_list);
 598         sdata->fragment_next = 0;
 599
 600         switch (sdata->vif.type) {
 601         case NL80211_IFTYPE_AP:
 602                 beacon = sdata->u.ap.beacon;
 603                 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
 604                 synchronize_rcu();
 605                 kfree(beacon);
 606
 607                 while ((skb = skb_dequeue(&sdata->u.ap.ps_bc_buf))) {
 608                         local->total_ps_buffered--;
 609                         dev_kfree_skb(skb);
 610                 }
 611
 612                 break;
 613         case NL80211_IFTYPE_MESH_POINT:
 614                 if (ieee80211_vif_is_mesh(&sdata->vif))
 615                         mesh_rmc_free(sdata);
 616                 break;
 617         case NL80211_IFTYPE_ADHOC:
 618                 if (WARN_ON(sdata->u.ibss.presp))
 619                         kfree_skb(sdata->u.ibss.presp);
 620                 break;
 621         case NL80211_IFTYPE_STATION:
 622         case NL80211_IFTYPE_WDS:
 623         case NL80211_IFTYPE_AP_VLAN:
 624         case NL80211_IFTYPE_MONITOR:
 625                 break;
 626         case NL80211_IFTYPE_UNSPECIFIED:
 627         case __NL80211_IFTYPE_AFTER_LAST:
 628                 BUG();
 629                 break;
 630         }
 631
 632         flushed = sta_info_flush(local, sdata);
 633         WARN_ON(flushed);
 634 }
 635
 636 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
 637                                          struct sk_buff *skb)
 638 {
 639         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
 640 }
 641
 642 static const struct net_device_ops ieee80211_dataif_ops = {
 643         .ndo_open               = ieee80211_open,
 644         .ndo_stop               = ieee80211_stop,
 645         .ndo_uninit             = ieee80211_teardown_sdata,
 646         .ndo_start_xmit         = ieee80211_subif_start_xmit,
 647         .ndo_set_multicast_list = ieee80211_set_multicast_list,
 648         .ndo_change_mtu         = ieee80211_change_mtu,
 649         .ndo_set_mac_address    = ieee80211_change_mac,
 650         .ndo_select_queue       = ieee80211_netdev_select_queue,
 651 };
 652
 653 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
 654                                           struct sk_buff *skb)
 655 {
 656         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 657         struct ieee80211_local *local = sdata->local;
 658         struct ieee80211_hdr *hdr;
 659         struct ieee80211_radiotap_header *rtap = (void *)skb->data;
 660         u8 *p;
 661
 662         if (local->hw.queues < 4)
 663                 return 0;
 664
 665         if (skb->len < 4 ||
 666             skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
 667                 return 0; /* doesn't matter, frame will be dropped */
 668
 669         hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
 670
 671         if (!ieee80211_is_data(hdr->frame_control)) {
 672                 skb->priority = 7;
 673                 return ieee802_1d_to_ac[skb->priority];
 674         }
 675         if (!ieee80211_is_data_qos(hdr->frame_control)) {
 676                 skb->priority = 0;
 677                 return ieee802_1d_to_ac[skb->priority];
 678         }
 679
 680         p = ieee80211_get_qos_ctl(hdr);
 681         skb->priority = *p & IEEE80211_QOS_CTL_TAG1D_MASK;
 682
 683         return ieee80211_downgrade_queue(local, skb);
 684 }
 685
 686 static const struct net_device_ops ieee80211_monitorif_ops = {
 687         .ndo_open               = ieee80211_open,
 688         .ndo_stop               = ieee80211_stop,
 689         .ndo_uninit             = ieee80211_teardown_sdata,
 690         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
 691         .ndo_set_multicast_list = ieee80211_set_multicast_list,
 692         .ndo_change_mtu         = ieee80211_change_mtu,
 693         .ndo_set_mac_address    = eth_mac_addr,
 694         .ndo_select_queue       = ieee80211_monitor_select_queue,
 695 };
 696
 697 static void ieee80211_if_setup(struct net_device *dev)
 698 {
 699         ether_setup(dev);
 700         dev->netdev_ops = &ieee80211_dataif_ops;
 701         dev->destructor = free_netdev;
 702 }
 703
 704 /*
 705  * Helper function to initialise an interface to a specific type.
 706  */
 707 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
 708                                   enum nl80211_iftype type)
 709 {
 710         /* clear type-dependent union */
 711         memset(&sdata->u, 0, sizeof(sdata->u));
 712
 713         /* and set some type-dependent values */
 714         sdata->vif.type = type;
 715         sdata->dev->netdev_ops = &ieee80211_dataif_ops;
 716         sdata->wdev.iftype = type;
 717
 718         /* only monitor differs */
 719         sdata->dev->type = ARPHRD_ETHER;
 720
 721         skb_queue_head_init(&sdata->skb_queue);
 722
 723         switch (type) {
 724         case NL80211_IFTYPE_AP:
 725                 skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
 726                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
 727                 break;
 728         case NL80211_IFTYPE_STATION:
 729                 ieee80211_sta_setup_sdata(sdata);
 730                 break;
 731         case NL80211_IFTYPE_ADHOC:
 732                 ieee80211_ibss_setup_sdata(sdata);
 733                 break;
 734         case NL80211_IFTYPE_MESH_POINT:
 735                 if (ieee80211_vif_is_mesh(&sdata->vif))
 736                         ieee80211_mesh_init_sdata(sdata);
 737                 break;
 738         case NL80211_IFTYPE_MONITOR:
 739                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
 740                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
 741                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
 742                                       MONITOR_FLAG_OTHER_BSS;
 743                 break;
 744         case NL80211_IFTYPE_WDS:
 745         case NL80211_IFTYPE_AP_VLAN:
 746                 break;
 747         case NL80211_IFTYPE_UNSPECIFIED:
 748         case __NL80211_IFTYPE_AFTER_LAST:
 749                 BUG();
 750                 break;
 751         }
 752
 753         ieee80211_debugfs_add_netdev(sdata);
 754 }
 755
 756 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
 757                              enum nl80211_iftype type)
 758 {
 759         ASSERT_RTNL();
 760
 761         if (type == sdata->vif.type)
 762                 return 0;
 763
 764         /* Setting ad-hoc mode on non-IBSS channel is not supported. */
 765         if (sdata->local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS &&
 766             type == NL80211_IFTYPE_ADHOC)
 767                 return -EOPNOTSUPP;
 768
 769         /*
 770          * We could, here, on changes between IBSS/STA/MESH modes,
 771          * invoke an MLME function instead that disassociates etc.
 772          * and goes into the requested mode.
 773          */
 774
 775         if (ieee80211_sdata_running(sdata))
 776                 return -EBUSY;
 777
 778         /* Purge and reset type-dependent state. */
 779         ieee80211_teardown_sdata(sdata->dev);
 780         ieee80211_setup_sdata(sdata, type);
 781
 782         /* reset some values that shouldn't be kept across type changes */
 783         sdata->vif.bss_conf.basic_rates =
 784                 ieee80211_mandatory_rates(sdata->local,
 785                         sdata->local->hw.conf.channel->band);
 786         sdata->drop_unencrypted = 0;
 787         if (type == NL80211_IFTYPE_STATION)
 788                 sdata->u.mgd.use_4addr = false;
 789
 790         return 0;
 791 }
 792
 793 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
 794                                        struct net_device *dev,
 795                                        enum nl80211_iftype type)
 796 {
 797         struct ieee80211_sub_if_data *sdata;
 798         u64 mask, start, addr, val, inc;
 799         u8 *m;
 800         u8 tmp_addr[ETH_ALEN];
 801         int i;
 802
 803         /* default ... something at least */
 804         memcpy(dev->perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
 805
 806         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
 807             local->hw.wiphy->n_addresses <= 1)
 808                 return;
 809
 810
 811         mutex_lock(&local->iflist_mtx);
 812
 813         switch (type) {
 814         case NL80211_IFTYPE_MONITOR:
 815                 /* doesn't matter */
 816                 break;
 817         case NL80211_IFTYPE_WDS:
 818         case NL80211_IFTYPE_AP_VLAN:
 819                 /* match up with an AP interface */
 820                 list_for_each_entry(sdata, &local->interfaces, list) {
 821                         if (sdata->vif.type != NL80211_IFTYPE_AP)
 822                                 continue;
 823                         memcpy(dev->perm_addr, sdata->vif.addr, ETH_ALEN);
 824                         break;
 825                 }
 826                 /* keep default if no AP interface present */
 827                 break;
 828         default:
 829                 /* assign a new address if possible -- try n_addresses first */
 830                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
 831                         bool used = false;
 832
 833                         list_for_each_entry(sdata, &local->interfaces, list) {
 834                                 if (memcmp(local->hw.wiphy->addresses[i].addr,
 835                                            sdata->vif.addr, ETH_ALEN) == 0) {
 836                                         used = true;
 837                                         break;
 838                                 }
 839                         }
 840
 841                         if (!used) {
 842                                 memcpy(dev->perm_addr,
 843                                        local->hw.wiphy->addresses[i].addr,
 844                                        ETH_ALEN);
 845                                 break;
 846                         }
 847                 }
 848
 849                 /* try mask if available */
 850                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
 851                         break;
 852
 853                 m = local->hw.wiphy->addr_mask;
 854                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 855                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 856                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 857
 858                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
 859                         /* not a contiguous mask ... not handled now! */
 860                         printk(KERN_DEBUG "not contiguous\n");
 861                         break;
 862                 }
 863
 864                 m = local->hw.wiphy->perm_addr;
 865                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 866                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 867                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 868
 869                 inc = 1ULL<<__ffs64(mask);
 870                 val = (start & mask);
 871                 addr = (start & ~mask) | (val & mask);
 872                 do {
 873                         bool used = false;
 874
 875                         tmp_addr[5] = addr >> 0*8;
 876                         tmp_addr[4] = addr >> 1*8;
 877                         tmp_addr[3] = addr >> 2*8;
 878                         tmp_addr[2] = addr >> 3*8;
 879                         tmp_addr[1] = addr >> 4*8;
 880                         tmp_addr[0] = addr >> 5*8;
 881
 882                         val += inc;
 883
 884                         list_for_each_entry(sdata, &local->interfaces, list) {
 885                                 if (memcmp(tmp_addr, sdata->vif.addr,
 886                                                         ETH_ALEN) == 0) {
 887                                         used = true;
 888                                         break;
 889                                 }
 890                         }
 891
 892                         if (!used) {
 893                                 memcpy(dev->perm_addr, tmp_addr, ETH_ALEN);
 894                                 break;
 895                         }
 896                         addr = (start & ~mask) | (val & mask);
 897                 } while (addr != start);
 898
 899                 break;
 900         }
 901
 902         mutex_unlock(&local->iflist_mtx);
 903 }
 904
 905 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
 906                      struct net_device **new_dev, enum nl80211_iftype type,
 907                      struct vif_params *params)
 908 {
 909         struct net_device *ndev;
 910         struct ieee80211_sub_if_data *sdata = NULL;
 911         int ret, i;
 912
 913         ASSERT_RTNL();
 914
 915         ndev = alloc_netdev_mq(sizeof(*sdata) + local->hw.vif_data_size,
 916                                name, ieee80211_if_setup, local->hw.queues);
 917         if (!ndev)
 918                 return -ENOMEM;
 919         dev_net_set(ndev, wiphy_net(local->hw.wiphy));
 920
 921         ndev->needed_headroom = local->tx_headroom +
 922                                 4*6 /* four MAC addresses */
 923                                 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
 924                                 + 6 /* mesh */
 925                                 + 8 /* rfc1042/bridge tunnel */
 926                                 - ETH_HLEN /* ethernet hard_header_len */
 927                                 + IEEE80211_ENCRYPT_HEADROOM;
 928         ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
 929
 930         ret = dev_alloc_name(ndev, ndev->name);
 931         if (ret < 0)
 932                 goto fail;
 933
 934         ieee80211_assign_perm_addr(local, ndev, type);
 935         memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
 936         SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
 937
 938         /* don't use IEEE80211_DEV_TO_SUB_IF because it checks too much */
 939         sdata = netdev_priv(ndev);
 940         ndev->ieee80211_ptr = &sdata->wdev;
 941         memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
 942         memcpy(sdata->name, ndev->name, IFNAMSIZ);
 943
 944         /* initialise type-independent data */
 945         sdata->wdev.wiphy = local->hw.wiphy;
 946         sdata->local = local;
 947         sdata->dev = ndev;
 948
 949         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
 950                 skb_queue_head_init(&sdata->fragments[i].skb_list);
 951
 952         INIT_LIST_HEAD(&sdata->key_list);
 953
 954         for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
 955                 struct ieee80211_supported_band *sband;
 956                 sband = local->hw.wiphy->bands[i];
 957                 sdata->rc_rateidx_mask[i] =
 958                         sband ? (1 << sband->n_bitrates) - 1 : 0;
 959         }
 960
 961         /* setup type-dependent data */
 962         ieee80211_setup_sdata(sdata, type);
 963
 964         if (params) {
 965                 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
 966                 if (type == NL80211_IFTYPE_STATION)
 967                         sdata->u.mgd.use_4addr = params->use_4addr;
 968         }
 969
 970         ret = register_netdevice(ndev);
 971         if (ret)
 972                 goto fail;
 973
 974         if (ieee80211_vif_is_mesh(&sdata->vif) &&
 975             params && params->mesh_id_len)
 976                 ieee80211_sdata_set_mesh_id(sdata,
 977                                             params->mesh_id_len,
 978                                             params->mesh_id);
 979
 980         mutex_lock(&local->iflist_mtx);
 981         list_add_tail_rcu(&sdata->list, &local->interfaces);
 982         mutex_unlock(&local->iflist_mtx);
 983
 984         if (new_dev)
 985                 *new_dev = ndev;
 986
 987         return 0;
 988
 989  fail:
 990         free_netdev(ndev);
 991         return ret;
 992 }
 993
 994 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
 995 {
 996         ASSERT_RTNL();
 997
 998         mutex_lock(&sdata->local->iflist_mtx);
 999         list_del_rcu(&sdata->list);
1000         mutex_unlock(&sdata->local->iflist_mtx);
1001
1002         synchronize_rcu();
1003         unregister_netdevice(sdata->dev);
1004 }
1005
1006 /*
1007  * Remove all interfaces, may only be called at hardware unregistration
1008  * time because it doesn't do RCU-safe list removals.
1009  */
1010 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1011 {
1012         struct ieee80211_sub_if_data *sdata, *tmp;
1013         LIST_HEAD(unreg_list);
1014
1015         ASSERT_RTNL();
1016
1017         mutex_lock(&local->iflist_mtx);
1018         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1019                 list_del(&sdata->list);
1020
1021                 unregister_netdevice_queue(sdata->dev, &unreg_list);
1022         }
1023         mutex_unlock(&local->iflist_mtx);
1024         unregister_netdevice_many(&unreg_list);
1025 }
1026
1027 static u32 ieee80211_idle_off(struct ieee80211_local *local,
1028                               const char *reason)
1029 {
1030         if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
1031                 return 0;
1032
1033 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1034         printk(KERN_DEBUG "%s: device no longer idle - %s\n",
1035                wiphy_name(local->hw.wiphy), reason);
1036 #endif
1037
1038         local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
1039         return IEEE80211_CONF_CHANGE_IDLE;
1040 }
1041
1042 static u32 ieee80211_idle_on(struct ieee80211_local *local)
1043 {
1044         if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
1045                 return 0;
1046
1047 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1048         printk(KERN_DEBUG "%s: device now idle\n",
1049                wiphy_name(local->hw.wiphy));
1050 #endif
1051
1052         drv_flush(local, false);
1053
1054         local->hw.conf.flags |= IEEE80211_CONF_IDLE;
1055         return IEEE80211_CONF_CHANGE_IDLE;
1056 }
1057
1058 u32 __ieee80211_recalc_idle(struct ieee80211_local *local)
1059 {
1060         struct ieee80211_sub_if_data *sdata;
1061         int count = 0;
1062
1063         if (!list_empty(&local->work_list))
1064                 return ieee80211_idle_off(local, "working");
1065
1066         if (local->scanning)
1067                 return ieee80211_idle_off(local, "scanning");
1068
1069         list_for_each_entry(sdata, &local->interfaces, list) {
1070                 if (!ieee80211_sdata_running(sdata))
1071                         continue;
1072                 /* do not count disabled managed interfaces */
1073                 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1074                     !sdata->u.mgd.associated)
1075                         continue;
1076                 /* do not count unused IBSS interfaces */
1077                 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
1078                     !sdata->u.ibss.ssid_len)
1079                         continue;
1080                 /* count everything else */
1081                 count++;
1082         }
1083
1084         if (!count)
1085                 return ieee80211_idle_on(local);
1086         else
1087                 return ieee80211_idle_off(local, "in use");
1088
1089         return 0;
1090 }
1091
1092 void ieee80211_recalc_idle(struct ieee80211_local *local)
1093 {
1094         u32 chg;
1095
1096         mutex_lock(&local->iflist_mtx);
1097         chg = __ieee80211_recalc_idle(local);
1098         mutex_unlock(&local->iflist_mtx);
1099         if (chg)
1100                 ieee80211_hw_config(local, chg);
1101 }
1102
1103 static int netdev_notify(struct notifier_block *nb,
1104                          unsigned long state,
1105                          void *ndev)
1106 {
1107         struct net_device *dev = ndev;
1108         struct ieee80211_sub_if_data *sdata;
1109
1110         if (state != NETDEV_CHANGENAME)
1111                 return 0;
1112
1113         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1114                 return 0;
1115
1116         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1117                 return 0;
1118
1119         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1120
1121         memcpy(sdata->name, dev->name, IFNAMSIZ);
1122
1123         ieee80211_debugfs_rename_netdev(sdata);
1124         return 0;
1125 }
1126
1127 static struct notifier_block mac80211_netdev_notifier = {
1128         .notifier_call = netdev_notify,
1129 };
1130
1131 int ieee80211_iface_init(void)
1132 {
1133         return register_netdevice_notifier(&mac80211_netdev_notifier);
1134 }
1135
1136 void ieee80211_iface_exit(void)
1137 {
1138         unregister_netdevice_notifier(&mac80211_netdev_notifier);
1139 }