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.work);
 464                 cancel_work_sync(&sdata->u.mgd.chswitch_work);
 465                 cancel_work_sync(&sdata->u.mgd.monitor_work);
 466                 cancel_work_sync(&sdata->u.mgd.beacon_connection_loss_work);
 467
 468                 /* fall through */
 469         case NL80211_IFTYPE_ADHOC:
 470                 if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 471                         del_timer_sync(&sdata->u.ibss.timer);
 472                         cancel_work_sync(&sdata->u.ibss.work);
 473                 }
 474                 /* fall through */
 475         case NL80211_IFTYPE_MESH_POINT:
 476                 if (ieee80211_vif_is_mesh(&sdata->vif)) {
 477                         /* other_bss and allmulti are always set on mesh
 478                          * ifaces */
 479                         local->fif_other_bss--;
 480                         atomic_dec(&local->iff_allmultis);
 481
 482                         ieee80211_configure_filter(local);
 483
 484                         ieee80211_stop_mesh(sdata);
 485                 }
 486                 /* fall through */
 487         default:
 488                 /*
 489                  * When we get here, the interface is marked down.
 490                  * Call synchronize_rcu() to wait for the RX path
 491                  * should it be using the interface and enqueuing
 492                  * frames at this very time on another CPU.
 493                  */
 494                 synchronize_rcu();
 495                 skb_queue_purge(&sdata->skb_queue);
 496
 497                 if (local->scan_sdata == sdata)
 498                         ieee80211_scan_cancel(local);
 499
 500                 /*
 501                  * Disable beaconing for AP and mesh, IBSS can't
 502                  * still be joined to a network at this point.
 503                  */
 504                 if (sdata->vif.type == NL80211_IFTYPE_AP ||
 505                     sdata->vif.type == NL80211_IFTYPE_MESH_POINT) {
 506                         ieee80211_bss_info_change_notify(sdata,
 507                                 BSS_CHANGED_BEACON_ENABLED);
 508                 }
 509
 510                 /* free all remaining keys, there shouldn't be any */
 511                 ieee80211_free_keys(sdata);
 512                 drv_remove_interface(local, &sdata->vif);
 513         }
 514
 515         sdata->bss = NULL;
 516
 517         hw_reconf_flags |= __ieee80211_recalc_idle(local);
 518
 519         ieee80211_recalc_ps(local, -1);
 520
 521         if (local->open_count == 0) {
 522                 ieee80211_clear_tx_pending(local);
 523                 ieee80211_stop_device(local);
 524
 525                 /* no reconfiguring after stop! */
 526                 hw_reconf_flags = 0;
 527         }
 528
 529         /* do after stop to avoid reconfiguring when we stop anyway */
 530         if (hw_reconf_flags)
 531                 ieee80211_hw_config(local, hw_reconf_flags);
 532
 533         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 534         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 535                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
 536                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 537                         if (info->control.vif == &sdata->vif) {
 538                                 __skb_unlink(skb, &local->pending[i]);
 539                                 dev_kfree_skb_irq(skb);
 540                         }
 541                 }
 542         }
 543         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 544
 545         return 0;
 546 }
 547
 548 static void ieee80211_set_multicast_list(struct net_device *dev)
 549 {
 550         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 551         struct ieee80211_local *local = sdata->local;
 552         int allmulti, promisc, sdata_allmulti, sdata_promisc;
 553
 554         allmulti = !!(dev->flags & IFF_ALLMULTI);
 555         promisc = !!(dev->flags & IFF_PROMISC);
 556         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
 557         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
 558
 559         if (allmulti != sdata_allmulti) {
 560                 if (dev->flags & IFF_ALLMULTI)
 561                         atomic_inc(&local->iff_allmultis);
 562                 else
 563                         atomic_dec(&local->iff_allmultis);
 564                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
 565         }
 566
 567         if (promisc != sdata_promisc) {
 568                 if (dev->flags & IFF_PROMISC)
 569                         atomic_inc(&local->iff_promiscs);
 570                 else
 571                         atomic_dec(&local->iff_promiscs);
 572                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
 573         }
 574         spin_lock_bh(&local->filter_lock);
 575         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
 576         spin_unlock_bh(&local->filter_lock);
 577         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
 578 }
 579
 580 /*
 581  * Called when the netdev is removed or, by the code below, before
 582  * the interface type changes.
 583  */
 584 static void ieee80211_teardown_sdata(struct net_device *dev)
 585 {
 586         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 587         struct ieee80211_local *local = sdata->local;
 588         struct beacon_data *beacon;
 589         struct sk_buff *skb;
 590         int flushed;
 591         int i;
 592
 593         /* free extra data */
 594         ieee80211_free_keys(sdata);
 595
 596         ieee80211_debugfs_remove_netdev(sdata);
 597
 598         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
 599                 __skb_queue_purge(&sdata->fragments[i].skb_list);
 600         sdata->fragment_next = 0;
 601
 602         switch (sdata->vif.type) {
 603         case NL80211_IFTYPE_AP:
 604                 beacon = sdata->u.ap.beacon;
 605                 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
 606                 synchronize_rcu();
 607                 kfree(beacon);
 608
 609                 while ((skb = skb_dequeue(&sdata->u.ap.ps_bc_buf))) {
 610                         local->total_ps_buffered--;
 611                         dev_kfree_skb(skb);
 612                 }
 613
 614                 break;
 615         case NL80211_IFTYPE_MESH_POINT:
 616                 if (ieee80211_vif_is_mesh(&sdata->vif))
 617                         mesh_rmc_free(sdata);
 618                 break;
 619         case NL80211_IFTYPE_ADHOC:
 620                 if (WARN_ON(sdata->u.ibss.presp))
 621                         kfree_skb(sdata->u.ibss.presp);
 622                 break;
 623         case NL80211_IFTYPE_STATION:
 624         case NL80211_IFTYPE_WDS:
 625         case NL80211_IFTYPE_AP_VLAN:
 626         case NL80211_IFTYPE_MONITOR:
 627                 break;
 628         case NL80211_IFTYPE_UNSPECIFIED:
 629         case __NL80211_IFTYPE_AFTER_LAST:
 630                 BUG();
 631                 break;
 632         }
 633
 634         flushed = sta_info_flush(local, sdata);
 635         WARN_ON(flushed);
 636 }
 637
 638 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
 639                                          struct sk_buff *skb)
 640 {
 641         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
 642 }
 643
 644 static const struct net_device_ops ieee80211_dataif_ops = {
 645         .ndo_open               = ieee80211_open,
 646         .ndo_stop               = ieee80211_stop,
 647         .ndo_uninit             = ieee80211_teardown_sdata,
 648         .ndo_start_xmit         = ieee80211_subif_start_xmit,
 649         .ndo_set_multicast_list = ieee80211_set_multicast_list,
 650         .ndo_change_mtu         = ieee80211_change_mtu,
 651         .ndo_set_mac_address    = ieee80211_change_mac,
 652         .ndo_select_queue       = ieee80211_netdev_select_queue,
 653 };
 654
 655 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
 656                                           struct sk_buff *skb)
 657 {
 658         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 659         struct ieee80211_local *local = sdata->local;
 660         struct ieee80211_hdr *hdr;
 661         struct ieee80211_radiotap_header *rtap = (void *)skb->data;
 662         u8 *p;
 663
 664         if (local->hw.queues < 4)
 665                 return 0;
 666
 667         if (skb->len < 4 ||
 668             skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
 669                 return 0; /* doesn't matter, frame will be dropped */
 670
 671         hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
 672
 673         if (!ieee80211_is_data(hdr->frame_control)) {
 674                 skb->priority = 7;
 675                 return ieee802_1d_to_ac[skb->priority];
 676         }
 677         if (!ieee80211_is_data_qos(hdr->frame_control)) {
 678                 skb->priority = 0;
 679                 return ieee802_1d_to_ac[skb->priority];
 680         }
 681
 682         p = ieee80211_get_qos_ctl(hdr);
 683         skb->priority = *p & IEEE80211_QOS_CTL_TAG1D_MASK;
 684
 685         return ieee80211_downgrade_queue(local, skb);
 686 }
 687
 688 static const struct net_device_ops ieee80211_monitorif_ops = {
 689         .ndo_open               = ieee80211_open,
 690         .ndo_stop               = ieee80211_stop,
 691         .ndo_uninit             = ieee80211_teardown_sdata,
 692         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
 693         .ndo_set_multicast_list = ieee80211_set_multicast_list,
 694         .ndo_change_mtu         = ieee80211_change_mtu,
 695         .ndo_set_mac_address    = eth_mac_addr,
 696         .ndo_select_queue       = ieee80211_monitor_select_queue,
 697 };
 698
 699 static void ieee80211_if_setup(struct net_device *dev)
 700 {
 701         ether_setup(dev);
 702         dev->netdev_ops = &ieee80211_dataif_ops;
 703         dev->destructor = free_netdev;
 704 }
 705
 706 /*
 707  * Helper function to initialise an interface to a specific type.
 708  */
 709 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
 710                                   enum nl80211_iftype type)
 711 {
 712         /* clear type-dependent union */
 713         memset(&sdata->u, 0, sizeof(sdata->u));
 714
 715         /* and set some type-dependent values */
 716         sdata->vif.type = type;
 717         sdata->dev->netdev_ops = &ieee80211_dataif_ops;
 718         sdata->wdev.iftype = type;
 719
 720         /* only monitor differs */
 721         sdata->dev->type = ARPHRD_ETHER;
 722
 723         skb_queue_head_init(&sdata->skb_queue);
 724
 725         switch (type) {
 726         case NL80211_IFTYPE_AP:
 727                 skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
 728                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
 729                 break;
 730         case NL80211_IFTYPE_STATION:
 731                 ieee80211_sta_setup_sdata(sdata);
 732                 break;
 733         case NL80211_IFTYPE_ADHOC:
 734                 ieee80211_ibss_setup_sdata(sdata);
 735                 break;
 736         case NL80211_IFTYPE_MESH_POINT:
 737                 if (ieee80211_vif_is_mesh(&sdata->vif))
 738                         ieee80211_mesh_init_sdata(sdata);
 739                 break;
 740         case NL80211_IFTYPE_MONITOR:
 741                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
 742                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
 743                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
 744                                       MONITOR_FLAG_OTHER_BSS;
 745                 break;
 746         case NL80211_IFTYPE_WDS:
 747         case NL80211_IFTYPE_AP_VLAN:
 748                 break;
 749         case NL80211_IFTYPE_UNSPECIFIED:
 750         case __NL80211_IFTYPE_AFTER_LAST:
 751                 BUG();
 752                 break;
 753         }
 754
 755         ieee80211_debugfs_add_netdev(sdata);
 756 }
 757
 758 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
 759                              enum nl80211_iftype type)
 760 {
 761         ASSERT_RTNL();
 762
 763         if (type == sdata->vif.type)
 764                 return 0;
 765
 766         /* Setting ad-hoc mode on non-IBSS channel is not supported. */
 767         if (sdata->local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS &&
 768             type == NL80211_IFTYPE_ADHOC)
 769                 return -EOPNOTSUPP;
 770
 771         /*
 772          * We could, here, on changes between IBSS/STA/MESH modes,
 773          * invoke an MLME function instead that disassociates etc.
 774          * and goes into the requested mode.
 775          */
 776
 777         if (ieee80211_sdata_running(sdata))
 778                 return -EBUSY;
 779
 780         /* Purge and reset type-dependent state. */
 781         ieee80211_teardown_sdata(sdata->dev);
 782         ieee80211_setup_sdata(sdata, type);
 783
 784         /* reset some values that shouldn't be kept across type changes */
 785         sdata->vif.bss_conf.basic_rates =
 786                 ieee80211_mandatory_rates(sdata->local,
 787                         sdata->local->hw.conf.channel->band);
 788         sdata->drop_unencrypted = 0;
 789         if (type == NL80211_IFTYPE_STATION)
 790                 sdata->u.mgd.use_4addr = false;
 791
 792         return 0;
 793 }
 794
 795 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
 796                                        struct net_device *dev,
 797                                        enum nl80211_iftype type)
 798 {
 799         struct ieee80211_sub_if_data *sdata;
 800         u64 mask, start, addr, val, inc;
 801         u8 *m;
 802         u8 tmp_addr[ETH_ALEN];
 803         int i;
 804
 805         /* default ... something at least */
 806         memcpy(dev->perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
 807
 808         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
 809             local->hw.wiphy->n_addresses <= 1)
 810                 return;
 811
 812
 813         mutex_lock(&local->iflist_mtx);
 814
 815         switch (type) {
 816         case NL80211_IFTYPE_MONITOR:
 817                 /* doesn't matter */
 818                 break;
 819         case NL80211_IFTYPE_WDS:
 820         case NL80211_IFTYPE_AP_VLAN:
 821                 /* match up with an AP interface */
 822                 list_for_each_entry(sdata, &local->interfaces, list) {
 823                         if (sdata->vif.type != NL80211_IFTYPE_AP)
 824                                 continue;
 825                         memcpy(dev->perm_addr, sdata->vif.addr, ETH_ALEN);
 826                         break;
 827                 }
 828                 /* keep default if no AP interface present */
 829                 break;
 830         default:
 831                 /* assign a new address if possible -- try n_addresses first */
 832                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
 833                         bool used = false;
 834
 835                         list_for_each_entry(sdata, &local->interfaces, list) {
 836                                 if (memcmp(local->hw.wiphy->addresses[i].addr,
 837                                            sdata->vif.addr, ETH_ALEN) == 0) {
 838                                         used = true;
 839                                         break;
 840                                 }
 841                         }
 842
 843                         if (!used) {
 844                                 memcpy(dev->perm_addr,
 845                                        local->hw.wiphy->addresses[i].addr,
 846                                        ETH_ALEN);
 847                                 break;
 848                         }
 849                 }
 850
 851                 /* try mask if available */
 852                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
 853                         break;
 854
 855                 m = local->hw.wiphy->addr_mask;
 856                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 857                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 858                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 859
 860                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
 861                         /* not a contiguous mask ... not handled now! */
 862                         printk(KERN_DEBUG "not contiguous\n");
 863                         break;
 864                 }
 865
 866                 m = local->hw.wiphy->perm_addr;
 867                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 868                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 869                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 870
 871                 inc = 1ULL<<__ffs64(mask);
 872                 val = (start & mask);
 873                 addr = (start & ~mask) | (val & mask);
 874                 do {
 875                         bool used = false;
 876
 877                         tmp_addr[5] = addr >> 0*8;
 878                         tmp_addr[4] = addr >> 1*8;
 879                         tmp_addr[3] = addr >> 2*8;
 880                         tmp_addr[2] = addr >> 3*8;
 881                         tmp_addr[1] = addr >> 4*8;
 882                         tmp_addr[0] = addr >> 5*8;
 883
 884                         val += inc;
 885
 886                         list_for_each_entry(sdata, &local->interfaces, list) {
 887                                 if (memcmp(tmp_addr, sdata->vif.addr,
 888                                                         ETH_ALEN) == 0) {
 889                                         used = true;
 890                                         break;
 891                                 }
 892                         }
 893
 894                         if (!used) {
 895                                 memcpy(dev->perm_addr, tmp_addr, ETH_ALEN);
 896                                 break;
 897                         }
 898                         addr = (start & ~mask) | (val & mask);
 899                 } while (addr != start);
 900
 901                 break;
 902         }
 903
 904         mutex_unlock(&local->iflist_mtx);
 905 }
 906
 907 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
 908                      struct net_device **new_dev, enum nl80211_iftype type,
 909                      struct vif_params *params)
 910 {
 911         struct net_device *ndev;
 912         struct ieee80211_sub_if_data *sdata = NULL;
 913         int ret, i;
 914
 915         ASSERT_RTNL();
 916
 917         ndev = alloc_netdev_mq(sizeof(*sdata) + local->hw.vif_data_size,
 918                                name, ieee80211_if_setup, local->hw.queues);
 919         if (!ndev)
 920                 return -ENOMEM;
 921         dev_net_set(ndev, wiphy_net(local->hw.wiphy));
 922
 923         ndev->needed_headroom = local->tx_headroom +
 924                                 4*6 /* four MAC addresses */
 925                                 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
 926                                 + 6 /* mesh */
 927                                 + 8 /* rfc1042/bridge tunnel */
 928                                 - ETH_HLEN /* ethernet hard_header_len */
 929                                 + IEEE80211_ENCRYPT_HEADROOM;
 930         ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
 931
 932         ret = dev_alloc_name(ndev, ndev->name);
 933         if (ret < 0)
 934                 goto fail;
 935
 936         ieee80211_assign_perm_addr(local, ndev, type);
 937         memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
 938         SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
 939
 940         /* don't use IEEE80211_DEV_TO_SUB_IF because it checks too much */
 941         sdata = netdev_priv(ndev);
 942         ndev->ieee80211_ptr = &sdata->wdev;
 943         memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
 944         memcpy(sdata->name, ndev->name, IFNAMSIZ);
 945
 946         /* initialise type-independent data */
 947         sdata->wdev.wiphy = local->hw.wiphy;
 948         sdata->local = local;
 949         sdata->dev = ndev;
 950
 951         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
 952                 skb_queue_head_init(&sdata->fragments[i].skb_list);
 953
 954         INIT_LIST_HEAD(&sdata->key_list);
 955
 956         for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
 957                 struct ieee80211_supported_band *sband;
 958                 sband = local->hw.wiphy->bands[i];
 959                 sdata->rc_rateidx_mask[i] =
 960                         sband ? (1 << sband->n_bitrates) - 1 : 0;
 961         }
 962
 963         /* setup type-dependent data */
 964         ieee80211_setup_sdata(sdata, type);
 965
 966         if (params) {
 967                 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
 968                 if (type == NL80211_IFTYPE_STATION)
 969                         sdata->u.mgd.use_4addr = params->use_4addr;
 970         }
 971
 972         ret = register_netdevice(ndev);
 973         if (ret)
 974                 goto fail;
 975
 976         if (ieee80211_vif_is_mesh(&sdata->vif) &&
 977             params && params->mesh_id_len)
 978                 ieee80211_sdata_set_mesh_id(sdata,
 979                                             params->mesh_id_len,
 980                                             params->mesh_id);
 981
 982         mutex_lock(&local->iflist_mtx);
 983         list_add_tail_rcu(&sdata->list, &local->interfaces);
 984         mutex_unlock(&local->iflist_mtx);
 985
 986         if (new_dev)
 987                 *new_dev = ndev;
 988
 989         return 0;
 990
 991  fail:
 992         free_netdev(ndev);
 993         return ret;
 994 }
 995
 996 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
 997 {
 998         ASSERT_RTNL();
 999
1000         mutex_lock(&sdata->local->iflist_mtx);
1001         list_del_rcu(&sdata->list);
1002         mutex_unlock(&sdata->local->iflist_mtx);
1003
1004         synchronize_rcu();
1005         unregister_netdevice(sdata->dev);
1006 }
1007
1008 /*
1009  * Remove all interfaces, may only be called at hardware unregistration
1010  * time because it doesn't do RCU-safe list removals.
1011  */
1012 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1013 {
1014         struct ieee80211_sub_if_data *sdata, *tmp;
1015         LIST_HEAD(unreg_list);
1016
1017         ASSERT_RTNL();
1018
1019         mutex_lock(&local->iflist_mtx);
1020         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1021                 list_del(&sdata->list);
1022
1023                 unregister_netdevice_queue(sdata->dev, &unreg_list);
1024         }
1025         mutex_unlock(&local->iflist_mtx);
1026         unregister_netdevice_many(&unreg_list);
1027 }
1028
1029 static u32 ieee80211_idle_off(struct ieee80211_local *local,
1030                               const char *reason)
1031 {
1032         if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
1033                 return 0;
1034
1035 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1036         printk(KERN_DEBUG "%s: device no longer idle - %s\n",
1037                wiphy_name(local->hw.wiphy), reason);
1038 #endif
1039
1040         local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
1041         return IEEE80211_CONF_CHANGE_IDLE;
1042 }
1043
1044 static u32 ieee80211_idle_on(struct ieee80211_local *local)
1045 {
1046         if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
1047                 return 0;
1048
1049 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1050         printk(KERN_DEBUG "%s: device now idle\n",
1051                wiphy_name(local->hw.wiphy));
1052 #endif
1053
1054         drv_flush(local, false);
1055
1056         local->hw.conf.flags |= IEEE80211_CONF_IDLE;
1057         return IEEE80211_CONF_CHANGE_IDLE;
1058 }
1059
1060 u32 __ieee80211_recalc_idle(struct ieee80211_local *local)
1061 {
1062         struct ieee80211_sub_if_data *sdata;
1063         int count = 0;
1064
1065         if (!list_empty(&local->work_list))
1066                 return ieee80211_idle_off(local, "working");
1067
1068         if (local->scanning)
1069                 return ieee80211_idle_off(local, "scanning");
1070
1071         list_for_each_entry(sdata, &local->interfaces, list) {
1072                 if (!ieee80211_sdata_running(sdata))
1073                         continue;
1074                 /* do not count disabled managed interfaces */
1075                 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1076                     !sdata->u.mgd.associated)
1077                         continue;
1078                 /* do not count unused IBSS interfaces */
1079                 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
1080                     !sdata->u.ibss.ssid_len)
1081                         continue;
1082                 /* count everything else */
1083                 count++;
1084         }
1085
1086         if (!count)
1087                 return ieee80211_idle_on(local);
1088         else
1089                 return ieee80211_idle_off(local, "in use");
1090
1091         return 0;
1092 }
1093
1094 void ieee80211_recalc_idle(struct ieee80211_local *local)
1095 {
1096         u32 chg;
1097
1098         mutex_lock(&local->iflist_mtx);
1099         chg = __ieee80211_recalc_idle(local);
1100         mutex_unlock(&local->iflist_mtx);
1101         if (chg)
1102                 ieee80211_hw_config(local, chg);
1103 }
1104
1105 static int netdev_notify(struct notifier_block *nb,
1106                          unsigned long state,
1107                          void *ndev)
1108 {
1109         struct net_device *dev = ndev;
1110         struct ieee80211_sub_if_data *sdata;
1111
1112         if (state != NETDEV_CHANGENAME)
1113                 return 0;
1114
1115         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1116                 return 0;
1117
1118         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1119                 return 0;
1120
1121         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1122
1123         memcpy(sdata->name, dev->name, IFNAMSIZ);
1124
1125         ieee80211_debugfs_rename_netdev(sdata);
1126         return 0;
1127 }
1128
1129 static struct notifier_block mac80211_netdev_notifier = {
1130         .notifier_call = netdev_notify,
1131 };
1132
1133 int ieee80211_iface_init(void)
1134 {
1135         return register_netdevice_notifier(&mac80211_netdev_notifier);
1136 }
1137
1138 void ieee80211_iface_exit(void)
1139 {
1140         unregister_netdevice_notifier(&mac80211_netdev_notifier);
1141 }