net/mac80211/iface.c

   1 /*
   2  * Interface handling (except master interface)
   3  *
   4  * Copyright 2002-2005, Instant802 Networks, Inc.
   5  * Copyright 2005-2006, Devicescape Software, Inc.
   6  * Copyright (c) 2006 Jiri Benc <jbenc@suse.cz>
   7  * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13 #include <linux/kernel.h>
  14 #include <linux/if_arp.h>
  15 #include <linux/netdevice.h>
  16 #include <linux/rtnetlink.h>
  17 #include <net/mac80211.h>
  18 #include "ieee80211_i.h"
  19 #include "sta_info.h"
  20 #include "debugfs_netdev.h"
  21 #include "mesh.h"
  22 #include "led.h"
  23 #include "driver-ops.h"
  24
  25 /**
  26  * DOC: Interface list locking
  27  *
  28  * The interface list in each struct ieee80211_local is protected
  29  * three-fold:
  30  *
  31  * (1) modifications may only be done under the RTNL
  32  * (2) modifications and readers are protected against each other by
  33  *     the iflist_mtx.
  34  * (3) modifications are done in an RCU manner so atomic readers
  35  *     can traverse the list in RCU-safe blocks.
  36  *
  37  * As a consequence, reads (traversals) of the list can be protected
  38  * by either the RTNL, the iflist_mtx or RCU.
  39  */
  40
  41
  42 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
  43 {
  44         int meshhdrlen;
  45         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
  46
  47         meshhdrlen = (sdata->vif.type == NL80211_IFTYPE_MESH_POINT) ? 5 : 0;
  48
  49         /* FIX: what would be proper limits for MTU?
  50          * This interface uses 802.3 frames. */
  51         if (new_mtu < 256 ||
  52             new_mtu > IEEE80211_MAX_DATA_LEN - 24 - 6 - meshhdrlen) {
  53                 return -EINVAL;
  54         }
  55
  56 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
  57         printk(KERN_DEBUG "%s: setting MTU %d\n", dev->name, new_mtu);
  58 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
  59         dev->mtu = new_mtu;
  60         return 0;
  61 }
  62
  63 static inline int identical_mac_addr_allowed(int type1, int type2)
  64 {
  65         return type1 == NL80211_IFTYPE_MONITOR ||
  66                 type2 == NL80211_IFTYPE_MONITOR ||
  67                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
  68                 (type1 == NL80211_IFTYPE_WDS &&
  69                         (type2 == NL80211_IFTYPE_WDS ||
  70                          type2 == NL80211_IFTYPE_AP)) ||
  71                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
  72                 (type1 == NL80211_IFTYPE_AP_VLAN &&
  73                         (type2 == NL80211_IFTYPE_AP ||
  74                          type2 == NL80211_IFTYPE_AP_VLAN));
  75 }
  76
  77 static int ieee80211_open(struct net_device *dev)
  78 {
  79         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
  80         struct ieee80211_sub_if_data *nsdata;
  81         struct ieee80211_local *local = sdata->local;
  82         struct sta_info *sta;
  83         struct ieee80211_if_init_conf conf;
  84         u32 changed = 0;
  85         int res;
  86         u32 hw_reconf_flags = 0;
  87         u8 null_addr[ETH_ALEN] = {0};
  88
  89         /* fail early if user set an invalid address */
  90         if (compare_ether_addr(dev->dev_addr, null_addr) &&
  91             !is_valid_ether_addr(dev->dev_addr))
  92                 return -EADDRNOTAVAIL;
  93
  94         /* we hold the RTNL here so can safely walk the list */
  95         list_for_each_entry(nsdata, &local->interfaces, list) {
  96                 struct net_device *ndev = nsdata->dev;
  97
  98                 if (ndev != dev && netif_running(ndev)) {
  99                         /*
 100                          * Allow only a single IBSS interface to be up at any
 101                          * time. This is restricted because beacon distribution
 102                          * cannot work properly if both are in the same IBSS.
 103                          *
 104                          * To remove this restriction we'd have to disallow them
 105                          * from setting the same SSID on different IBSS interfaces
 106                          * belonging to the same hardware. Then, however, we're
 107                          * faced with having to adopt two different TSF timers...
 108                          */
 109                         if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
 110                             nsdata->vif.type == NL80211_IFTYPE_ADHOC)
 111                                 return -EBUSY;
 112
 113                         /*
 114                          * The remaining checks are only performed for interfaces
 115                          * with the same MAC address.
 116                          */
 117                         if (compare_ether_addr(dev->dev_addr, ndev->dev_addr))
 118                                 continue;
 119
 120                         /*
 121                          * check whether it may have the same address
 122                          */
 123                         if (!identical_mac_addr_allowed(sdata->vif.type,
 124                                                         nsdata->vif.type))
 125                                 return -ENOTUNIQ;
 126
 127                         /*
 128                          * can only add VLANs to enabled APs
 129                          */
 130                         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
 131                             nsdata->vif.type == NL80211_IFTYPE_AP)
 132                                 sdata->bss = &nsdata->u.ap;
 133                 }
 134         }
 135
 136         switch (sdata->vif.type) {
 137         case NL80211_IFTYPE_WDS:
 138                 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
 139                         return -ENOLINK;
 140                 break;
 141         case NL80211_IFTYPE_AP_VLAN:
 142                 if (!sdata->bss)
 143                         return -ENOLINK;
 144                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
 145                 break;
 146         case NL80211_IFTYPE_AP:
 147                 sdata->bss = &sdata->u.ap;
 148                 break;
 149         case NL80211_IFTYPE_MESH_POINT:
 150                 if (!ieee80211_vif_is_mesh(&sdata->vif))
 151                         break;
 152                 /* mesh ifaces must set allmulti to forward mcast traffic */
 153                 atomic_inc(&local->iff_allmultis);
 154                 break;
 155         case NL80211_IFTYPE_STATION:
 156         case NL80211_IFTYPE_MONITOR:
 157         case NL80211_IFTYPE_ADHOC:
 158                 /* no special treatment */
 159                 break;
 160         case NL80211_IFTYPE_UNSPECIFIED:
 161         case __NL80211_IFTYPE_AFTER_LAST:
 162                 /* cannot happen */
 163                 WARN_ON(1);
 164                 break;
 165         }
 166
 167         if (local->open_count == 0) {
 168                 res = drv_start(local);
 169                 if (res)
 170                         goto err_del_bss;
 171                 /* we're brought up, everything changes */
 172                 hw_reconf_flags = ~0;
 173                 ieee80211_led_radio(local, true);
 174         }
 175
 176         /*
 177          * Check all interfaces and copy the hopefully now-present
 178          * MAC address to those that have the special null one.
 179          */
 180         list_for_each_entry(nsdata, &local->interfaces, list) {
 181                 struct net_device *ndev = nsdata->dev;
 182
 183                 /*
 184                  * No need to check netif_running since we do not allow
 185                  * it to start up with this invalid address.
 186                  */
 187                 if (compare_ether_addr(null_addr, ndev->dev_addr) == 0)
 188                         memcpy(ndev->dev_addr,
 189                                local->hw.wiphy->perm_addr,
 190                                ETH_ALEN);
 191         }
 192
 193         if (compare_ether_addr(null_addr, local->mdev->dev_addr) == 0)
 194                 memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr,
 195                        ETH_ALEN);
 196
 197         /*
 198          * Validate the MAC address for this device.
 199          */
 200         if (!is_valid_ether_addr(dev->dev_addr)) {
 201                 if (!local->open_count)
 202                         drv_stop(local);
 203                 return -EADDRNOTAVAIL;
 204         }
 205
 206         switch (sdata->vif.type) {
 207         case NL80211_IFTYPE_AP_VLAN:
 208                 /* no need to tell driver */
 209                 break;
 210         case NL80211_IFTYPE_MONITOR:
 211                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 212                         local->cooked_mntrs++;
 213                         break;
 214                 }
 215
 216                 /* must be before the call to ieee80211_configure_filter */
 217                 local->monitors++;
 218                 if (local->monitors == 1) {
 219                         local->hw.conf.flags |= IEEE80211_CONF_RADIOTAP;
 220                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_RADIOTAP;
 221                 }
 222
 223                 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
 224                         local->fif_fcsfail++;
 225                 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
 226                         local->fif_plcpfail++;
 227                 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL)
 228                         local->fif_control++;
 229                 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
 230                         local->fif_other_bss++;
 231
 232                 netif_addr_lock_bh(local->mdev);
 233                 ieee80211_configure_filter(local);
 234                 netif_addr_unlock_bh(local->mdev);
 235                 break;
 236         case NL80211_IFTYPE_STATION:
 237                 sdata->u.mgd.flags &= ~IEEE80211_STA_PREV_BSSID_SET;
 238                 /* fall through */
 239         default:
 240                 conf.vif = &sdata->vif;
 241                 conf.type = sdata->vif.type;
 242                 conf.mac_addr = dev->dev_addr;
 243                 res = drv_add_interface(local, &conf);
 244                 if (res)
 245                         goto err_stop;
 246
 247                 if (ieee80211_vif_is_mesh(&sdata->vif)) {
 248                         local->fif_other_bss++;
 249                         netif_addr_lock_bh(local->mdev);
 250                         ieee80211_configure_filter(local);
 251                         netif_addr_unlock_bh(local->mdev);
 252
 253                         ieee80211_start_mesh(sdata);
 254                 }
 255                 changed |= ieee80211_reset_erp_info(sdata);
 256                 ieee80211_bss_info_change_notify(sdata, changed);
 257                 ieee80211_enable_keys(sdata);
 258
 259                 if (sdata->vif.type == NL80211_IFTYPE_STATION)
 260                         netif_carrier_off(dev);
 261                 else
 262                         netif_carrier_on(dev);
 263         }
 264
 265         if (sdata->vif.type == NL80211_IFTYPE_WDS) {
 266                 /* Create STA entry for the WDS peer */
 267                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
 268                                      GFP_KERNEL);
 269                 if (!sta) {
 270                         res = -ENOMEM;
 271                         goto err_del_interface;
 272                 }
 273
 274                 /* no locking required since STA is not live yet */
 275                 sta->flags |= WLAN_STA_AUTHORIZED;
 276
 277                 res = sta_info_insert(sta);
 278                 if (res) {
 279                         /* STA has been freed */
 280                         goto err_del_interface;
 281                 }
 282         }
 283
 284         if (local->open_count == 0) {
 285                 res = dev_open(local->mdev);
 286                 WARN_ON(res);
 287                 if (res)
 288                         goto err_del_interface;
 289                 tasklet_enable(&local->tx_pending_tasklet);
 290                 tasklet_enable(&local->tasklet);
 291         }
 292
 293         /*
 294          * set_multicast_list will be invoked by the networking core
 295          * which will check whether any increments here were done in
 296          * error and sync them down to the hardware as filter flags.
 297          */
 298         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 299                 atomic_inc(&local->iff_allmultis);
 300
 301         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 302                 atomic_inc(&local->iff_promiscs);
 303
 304         hw_reconf_flags |= __ieee80211_recalc_idle(local);
 305
 306         local->open_count++;
 307         if (hw_reconf_flags) {
 308                 ieee80211_hw_config(local, hw_reconf_flags);
 309                 /*
 310                  * set default queue parameters so drivers don't
 311                  * need to initialise the hardware if the hardware
 312                  * doesn't start up with sane defaults
 313                  */
 314                 ieee80211_set_wmm_default(sdata);
 315         }
 316
 317         ieee80211_recalc_ps(local, -1);
 318
 319         /*
 320          * ieee80211_sta_work is disabled while network interface
 321          * is down. Therefore, some configuration changes may not
 322          * yet be effective. Trigger execution of ieee80211_sta_work
 323          * to fix this.
 324          */
 325         if (sdata->vif.type == NL80211_IFTYPE_STATION)
 326                 queue_work(local->hw.workqueue, &sdata->u.mgd.work);
 327
 328         netif_tx_start_all_queues(dev);
 329
 330         return 0;
 331  err_del_interface:
 332         drv_remove_interface(local, &conf);
 333  err_stop:
 334         if (!local->open_count)
 335                 drv_stop(local);
 336  err_del_bss:
 337         sdata->bss = NULL;
 338         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
 339                 list_del(&sdata->u.vlan.list);
 340         return res;
 341 }
 342
 343 static int ieee80211_stop(struct net_device *dev)
 344 {
 345         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 346         struct ieee80211_local *local = sdata->local;
 347         struct ieee80211_if_init_conf conf;
 348         struct sta_info *sta;
 349         u32 hw_reconf_flags = 0;
 350
 351         /*
 352          * Stop TX on this interface first.
 353          */
 354         netif_tx_stop_all_queues(dev);
 355
 356         /*
 357          * Now delete all active aggregation sessions.
 358          */
 359         rcu_read_lock();
 360
 361         list_for_each_entry_rcu(sta, &local->sta_list, list) {
 362                 if (sta->sdata == sdata)
 363                         ieee80211_sta_tear_down_BA_sessions(sta);
 364         }
 365
 366         rcu_read_unlock();
 367
 368         /*
 369          * Announce that we are leaving the network, in case we are a
 370          * station interface type. This must be done before removing
 371          * all stations associated with sta_info_flush, otherwise STA
 372          * information will be gone and no announce being done.
 373          */
 374         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
 375                 if (sdata->u.mgd.state != IEEE80211_STA_MLME_DISABLED)
 376                         ieee80211_sta_deauthenticate(sdata,
 377                                 WLAN_REASON_DEAUTH_LEAVING);
 378         }
 379
 380         /*
 381          * Remove all stations associated with this interface.
 382          *
 383          * This must be done before calling ops->remove_interface()
 384          * because otherwise we can later invoke ops->sta_notify()
 385          * whenever the STAs are removed, and that invalidates driver
 386          * assumptions about always getting a vif pointer that is valid
 387          * (because if we remove a STA after ops->remove_interface()
 388          * the driver will have removed the vif info already!)
 389          *
 390          * We could relax this and only unlink the stations from the
 391          * hash table and list but keep them on a per-sdata list that
 392          * will be inserted back again when the interface is brought
 393          * up again, but I don't currently see a use case for that,
 394          * except with WDS which gets a STA entry created when it is
 395          * brought up.
 396          */
 397         sta_info_flush(local, sdata);
 398
 399         /*
 400          * Don't count this interface for promisc/allmulti while it
 401          * is down. dev_mc_unsync() will invoke set_multicast_list
 402          * on the master interface which will sync these down to the
 403          * hardware as filter flags.
 404          */
 405         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 406                 atomic_dec(&local->iff_allmultis);
 407
 408         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 409                 atomic_dec(&local->iff_promiscs);
 410
 411         dev_mc_unsync(local->mdev, dev);
 412         del_timer_sync(&local->dynamic_ps_timer);
 413         cancel_work_sync(&local->dynamic_ps_enable_work);
 414
 415         /* APs need special treatment */
 416         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 417                 struct ieee80211_sub_if_data *vlan, *tmp;
 418                 struct beacon_data *old_beacon = sdata->u.ap.beacon;
 419
 420                 /* remove beacon */
 421                 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
 422                 synchronize_rcu();
 423                 kfree(old_beacon);
 424
 425                 /* down all dependent devices, that is VLANs */
 426                 list_for_each_entry_safe(vlan, tmp, &sdata->u.ap.vlans,
 427                                          u.vlan.list)
 428                         dev_close(vlan->dev);
 429                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
 430         }
 431
 432         local->open_count--;
 433
 434         switch (sdata->vif.type) {
 435         case NL80211_IFTYPE_AP_VLAN:
 436                 list_del(&sdata->u.vlan.list);
 437                 /* no need to tell driver */
 438                 break;
 439         case NL80211_IFTYPE_MONITOR:
 440                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 441                         local->cooked_mntrs--;
 442                         break;
 443                 }
 444
 445                 local->monitors--;
 446                 if (local->monitors == 0) {
 447                         local->hw.conf.flags &= ~IEEE80211_CONF_RADIOTAP;
 448                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_RADIOTAP;
 449                 }
 450
 451                 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
 452                         local->fif_fcsfail--;
 453                 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
 454                         local->fif_plcpfail--;
 455                 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL)
 456                         local->fif_control--;
 457                 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
 458                         local->fif_other_bss--;
 459
 460                 netif_addr_lock_bh(local->mdev);
 461                 ieee80211_configure_filter(local);
 462                 netif_addr_unlock_bh(local->mdev);
 463                 break;
 464         case NL80211_IFTYPE_STATION:
 465                 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
 466                 del_timer_sync(&sdata->u.mgd.chswitch_timer);
 467                 del_timer_sync(&sdata->u.mgd.timer);
 468                 /*
 469                  * If the timer fired while we waited for it, it will have
 470                  * requeued the work. Now the work will be running again
 471                  * but will not rearm the timer again because it checks
 472                  * whether the interface is running, which, at this point,
 473                  * it no longer is.
 474                  */
 475                 cancel_work_sync(&sdata->u.mgd.work);
 476                 cancel_work_sync(&sdata->u.mgd.chswitch_work);
 477
 478                 cancel_work_sync(&sdata->u.mgd.beacon_loss_work);
 479
 480                 /*
 481                  * When we get here, the interface is marked down.
 482                  * Call synchronize_rcu() to wait for the RX path
 483                  * should it be using the interface and enqueuing
 484                  * frames at this very time on another CPU.
 485                  */
 486                 synchronize_rcu();
 487                 skb_queue_purge(&sdata->u.mgd.skb_queue);
 488
 489                 sdata->u.mgd.flags &= ~(IEEE80211_STA_PRIVACY_INVOKED |
 490                                         IEEE80211_STA_TKIP_WEP_USED);
 491                 kfree(sdata->u.mgd.extra_ie);
 492                 sdata->u.mgd.extra_ie = NULL;
 493                 sdata->u.mgd.extra_ie_len = 0;
 494                 /* fall through */
 495         case NL80211_IFTYPE_ADHOC:
 496                 if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 497                         del_timer_sync(&sdata->u.ibss.timer);
 498                         cancel_work_sync(&sdata->u.ibss.work);
 499                         synchronize_rcu();
 500                         skb_queue_purge(&sdata->u.ibss.skb_queue);
 501                 }
 502                 /* fall through */
 503         case NL80211_IFTYPE_MESH_POINT:
 504                 if (ieee80211_vif_is_mesh(&sdata->vif)) {
 505                         /* other_bss and allmulti are always set on mesh
 506                          * ifaces */
 507                         local->fif_other_bss--;
 508                         atomic_dec(&local->iff_allmultis);
 509
 510                         netif_addr_lock_bh(local->mdev);
 511                         ieee80211_configure_filter(local);
 512                         netif_addr_unlock_bh(local->mdev);
 513
 514                         ieee80211_stop_mesh(sdata);
 515                 }
 516                 /* fall through */
 517         default:
 518                 if (local->scan_sdata == sdata) {
 519                         if (!local->ops->hw_scan)
 520                                 cancel_delayed_work_sync(&local->scan_work);
 521                         /*
 522                          * The software scan can no longer run now, so we can
 523                          * clear out the scan_sdata reference. However, the
 524                          * hardware scan may still be running. The complete
 525                          * function must be prepared to handle a NULL value.
 526                          */
 527                         local->scan_sdata = NULL;
 528                         /*
 529                          * The memory barrier guarantees that another CPU
 530                          * that is hardware-scanning will now see the fact
 531                          * that this interface is gone.
 532                          */
 533                         smp_mb();
 534                         /*
 535                          * If software scanning, complete the scan but since
 536                          * the scan_sdata is NULL already don't send out a
 537                          * scan event to userspace -- the scan is incomplete.
 538                          */
 539                         if (local->sw_scanning)
 540                                 ieee80211_scan_completed(&local->hw, true);
 541                 }
 542
 543                 conf.vif = &sdata->vif;
 544                 conf.type = sdata->vif.type;
 545                 conf.mac_addr = dev->dev_addr;
 546                 /* disable all keys for as long as this netdev is down */
 547                 ieee80211_disable_keys(sdata);
 548                 drv_remove_interface(local, &conf);
 549         }
 550
 551         sdata->bss = NULL;
 552
 553         hw_reconf_flags |= __ieee80211_recalc_idle(local);
 554
 555         ieee80211_recalc_ps(local, -1);
 556
 557         if (local->open_count == 0) {
 558                 if (netif_running(local->mdev))
 559                         dev_close(local->mdev);
 560
 561                 drv_stop(local);
 562
 563                 ieee80211_led_radio(local, false);
 564
 565                 flush_workqueue(local->hw.workqueue);
 566
 567                 tasklet_disable(&local->tx_pending_tasklet);
 568                 tasklet_disable(&local->tasklet);
 569
 570                 /* no reconfiguring after stop! */
 571                 hw_reconf_flags = 0;
 572         }
 573
 574         /* do after stop to avoid reconfiguring when we stop anyway */
 575         if (hw_reconf_flags)
 576                 ieee80211_hw_config(local, hw_reconf_flags);
 577
 578         return 0;
 579 }
 580
 581 static void ieee80211_set_multicast_list(struct net_device *dev)
 582 {
 583         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 584         struct ieee80211_local *local = sdata->local;
 585         int allmulti, promisc, sdata_allmulti, sdata_promisc;
 586
 587         allmulti = !!(dev->flags & IFF_ALLMULTI);
 588         promisc = !!(dev->flags & IFF_PROMISC);
 589         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
 590         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
 591
 592         if (allmulti != sdata_allmulti) {
 593                 if (dev->flags & IFF_ALLMULTI)
 594                         atomic_inc(&local->iff_allmultis);
 595                 else
 596                         atomic_dec(&local->iff_allmultis);
 597                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
 598         }
 599
 600         if (promisc != sdata_promisc) {
 601                 if (dev->flags & IFF_PROMISC)
 602                         atomic_inc(&local->iff_promiscs);
 603                 else
 604                         atomic_dec(&local->iff_promiscs);
 605                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
 606         }
 607
 608         dev_mc_sync(local->mdev, dev);
 609 }
 610
 611 /*
 612  * Called when the netdev is removed or, by the code below, before
 613  * the interface type changes.
 614  */
 615 static void ieee80211_teardown_sdata(struct net_device *dev)
 616 {
 617         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 618         struct ieee80211_local *local = sdata->local;
 619         struct beacon_data *beacon;
 620         struct sk_buff *skb;
 621         int flushed;
 622         int i;
 623
 624         /* free extra data */
 625         ieee80211_free_keys(sdata);
 626
 627         ieee80211_debugfs_remove_netdev(sdata);
 628
 629         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
 630                 __skb_queue_purge(&sdata->fragments[i].skb_list);
 631         sdata->fragment_next = 0;
 632
 633         switch (sdata->vif.type) {
 634         case NL80211_IFTYPE_AP:
 635                 beacon = sdata->u.ap.beacon;
 636                 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
 637                 synchronize_rcu();
 638                 kfree(beacon);
 639
 640                 while ((skb = skb_dequeue(&sdata->u.ap.ps_bc_buf))) {
 641                         local->total_ps_buffered--;
 642                         dev_kfree_skb(skb);
 643                 }
 644
 645                 break;
 646         case NL80211_IFTYPE_MESH_POINT:
 647                 if (ieee80211_vif_is_mesh(&sdata->vif))
 648                         mesh_rmc_free(sdata);
 649                 break;
 650         case NL80211_IFTYPE_ADHOC:
 651                 if (WARN_ON(sdata->u.ibss.presp))
 652                         kfree_skb(sdata->u.ibss.presp);
 653                 break;
 654         case NL80211_IFTYPE_STATION:
 655                 kfree(sdata->u.mgd.extra_ie);
 656                 kfree(sdata->u.mgd.assocreq_ies);
 657                 kfree(sdata->u.mgd.assocresp_ies);
 658                 kfree(sdata->u.mgd.sme_auth_ie);
 659                 break;
 660         case NL80211_IFTYPE_WDS:
 661         case NL80211_IFTYPE_AP_VLAN:
 662         case NL80211_IFTYPE_MONITOR:
 663                 break;
 664         case NL80211_IFTYPE_UNSPECIFIED:
 665         case __NL80211_IFTYPE_AFTER_LAST:
 666                 BUG();
 667                 break;
 668         }
 669
 670         flushed = sta_info_flush(local, sdata);
 671         WARN_ON(flushed);
 672 }
 673
 674 static const struct net_device_ops ieee80211_dataif_ops = {
 675         .ndo_open               = ieee80211_open,
 676         .ndo_stop               = ieee80211_stop,
 677         .ndo_uninit             = ieee80211_teardown_sdata,
 678         .ndo_start_xmit         = ieee80211_subif_start_xmit,
 679         .ndo_set_multicast_list = ieee80211_set_multicast_list,
 680         .ndo_change_mtu         = ieee80211_change_mtu,
 681         .ndo_set_mac_address    = eth_mac_addr,
 682 };
 683
 684 static const struct net_device_ops ieee80211_monitorif_ops = {
 685         .ndo_open               = ieee80211_open,
 686         .ndo_stop               = ieee80211_stop,
 687         .ndo_uninit             = ieee80211_teardown_sdata,
 688         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
 689         .ndo_set_multicast_list = ieee80211_set_multicast_list,
 690         .ndo_change_mtu         = ieee80211_change_mtu,
 691         .ndo_set_mac_address    = eth_mac_addr,
 692 };
 693
 694 static void ieee80211_if_setup(struct net_device *dev)
 695 {
 696         ether_setup(dev);
 697         dev->netdev_ops = &ieee80211_dataif_ops;
 698         dev->wireless_handlers = &ieee80211_iw_handler_def;
 699         dev->destructor = free_netdev;
 700 }
 701
 702 /*
 703  * Helper function to initialise an interface to a specific type.
 704  */
 705 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
 706                                   enum nl80211_iftype type)
 707 {
 708         /* clear type-dependent union */
 709         memset(&sdata->u, 0, sizeof(sdata->u));
 710
 711         /* and set some type-dependent values */
 712         sdata->vif.type = type;
 713         sdata->dev->netdev_ops = &ieee80211_dataif_ops;
 714         sdata->wdev.iftype = type;
 715
 716         /* only monitor differs */
 717         sdata->dev->type = ARPHRD_ETHER;
 718
 719         switch (type) {
 720         case NL80211_IFTYPE_AP:
 721                 skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
 722                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
 723                 break;
 724         case NL80211_IFTYPE_STATION:
 725                 ieee80211_sta_setup_sdata(sdata);
 726                 break;
 727         case NL80211_IFTYPE_ADHOC:
 728                 ieee80211_ibss_setup_sdata(sdata);
 729                 break;
 730         case NL80211_IFTYPE_MESH_POINT:
 731                 if (ieee80211_vif_is_mesh(&sdata->vif))
 732                         ieee80211_mesh_init_sdata(sdata);
 733                 break;
 734         case NL80211_IFTYPE_MONITOR:
 735                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
 736                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
 737                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
 738                                       MONITOR_FLAG_OTHER_BSS;
 739                 break;
 740         case NL80211_IFTYPE_WDS:
 741         case NL80211_IFTYPE_AP_VLAN:
 742                 break;
 743         case NL80211_IFTYPE_UNSPECIFIED:
 744         case __NL80211_IFTYPE_AFTER_LAST:
 745                 BUG();
 746                 break;
 747         }
 748
 749         ieee80211_debugfs_add_netdev(sdata);
 750 }
 751
 752 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
 753                              enum nl80211_iftype type)
 754 {
 755         ASSERT_RTNL();
 756
 757         if (type == sdata->vif.type)
 758                 return 0;
 759
 760         /* Setting ad-hoc mode on non-IBSS channel is not supported. */
 761         if (sdata->local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS &&
 762             type == NL80211_IFTYPE_ADHOC)
 763                 return -EOPNOTSUPP;
 764
 765         /*
 766          * We could, here, on changes between IBSS/STA/MESH modes,
 767          * invoke an MLME function instead that disassociates etc.
 768          * and goes into the requested mode.
 769          */
 770
 771         if (netif_running(sdata->dev))
 772                 return -EBUSY;
 773
 774         /* Purge and reset type-dependent state. */
 775         ieee80211_teardown_sdata(sdata->dev);
 776         ieee80211_setup_sdata(sdata, type);
 777
 778         /* reset some values that shouldn't be kept across type changes */
 779         sdata->vif.bss_conf.basic_rates =
 780                 ieee80211_mandatory_rates(sdata->local,
 781                         sdata->local->hw.conf.channel->band);
 782         sdata->drop_unencrypted = 0;
 783
 784         return 0;
 785 }
 786
 787 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
 788                      struct net_device **new_dev, enum nl80211_iftype type,
 789                      struct vif_params *params)
 790 {
 791         struct net_device *ndev;
 792         struct ieee80211_sub_if_data *sdata = NULL;
 793         int ret, i;
 794
 795         ASSERT_RTNL();
 796
 797         ndev = alloc_netdev(sizeof(*sdata) + local->hw.vif_data_size,
 798                             name, ieee80211_if_setup);
 799         if (!ndev)
 800                 return -ENOMEM;
 801
 802         ndev->needed_headroom = local->tx_headroom +
 803                                 4*6 /* four MAC addresses */
 804                                 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
 805                                 + 6 /* mesh */
 806                                 + 8 /* rfc1042/bridge tunnel */
 807                                 - ETH_HLEN /* ethernet hard_header_len */
 808                                 + IEEE80211_ENCRYPT_HEADROOM;
 809         ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
 810
 811         ret = dev_alloc_name(ndev, ndev->name);
 812         if (ret < 0)
 813                 goto fail;
 814
 815         memcpy(ndev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
 816         SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
 817         ndev->features |= NETIF_F_NETNS_LOCAL;
 818
 819         /* don't use IEEE80211_DEV_TO_SUB_IF because it checks too much */
 820         sdata = netdev_priv(ndev);
 821         ndev->ieee80211_ptr = &sdata->wdev;
 822
 823         /* initialise type-independent data */
 824         sdata->wdev.wiphy = local->hw.wiphy;
 825         sdata->local = local;
 826         sdata->dev = ndev;
 827
 828         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
 829                 skb_queue_head_init(&sdata->fragments[i].skb_list);
 830
 831         INIT_LIST_HEAD(&sdata->key_list);
 832
 833         sdata->force_unicast_rateidx = -1;
 834         sdata->max_ratectrl_rateidx = -1;
 835
 836         /* setup type-dependent data */
 837         ieee80211_setup_sdata(sdata, type);
 838
 839         ret = register_netdevice(ndev);
 840         if (ret)
 841                 goto fail;
 842
 843         if (ieee80211_vif_is_mesh(&sdata->vif) &&
 844             params && params->mesh_id_len)
 845                 ieee80211_sdata_set_mesh_id(sdata,
 846                                             params->mesh_id_len,
 847                                             params->mesh_id);
 848
 849         mutex_lock(&local->iflist_mtx);
 850         list_add_tail_rcu(&sdata->list, &local->interfaces);
 851         mutex_unlock(&local->iflist_mtx);
 852
 853         if (new_dev)
 854                 *new_dev = ndev;
 855
 856         return 0;
 857
 858  fail:
 859         free_netdev(ndev);
 860         return ret;
 861 }
 862
 863 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
 864 {
 865         ASSERT_RTNL();
 866
 867         mutex_lock(&sdata->local->iflist_mtx);
 868         list_del_rcu(&sdata->list);
 869         mutex_unlock(&sdata->local->iflist_mtx);
 870
 871         synchronize_rcu();
 872         unregister_netdevice(sdata->dev);
 873 }
 874
 875 /*
 876  * Remove all interfaces, may only be called at hardware unregistration
 877  * time because it doesn't do RCU-safe list removals.
 878  */
 879 void ieee80211_remove_interfaces(struct ieee80211_local *local)
 880 {
 881         struct ieee80211_sub_if_data *sdata, *tmp;
 882
 883         ASSERT_RTNL();
 884
 885         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
 886                 /*
 887                  * we cannot hold the iflist_mtx across unregister_netdevice,
 888                  * but we only need to hold it for list modifications to lock
 889                  * out readers since we're under the RTNL here as all other
 890                  * writers.
 891                  */
 892                 mutex_lock(&local->iflist_mtx);
 893                 list_del(&sdata->list);
 894                 mutex_unlock(&local->iflist_mtx);
 895
 896                 unregister_netdevice(sdata->dev);
 897         }
 898 }
 899
 900 static u32 ieee80211_idle_off(struct ieee80211_local *local,
 901                               const char *reason)
 902 {
 903         if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
 904                 return 0;
 905
 906 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 907         printk(KERN_DEBUG "%s: device no longer idle - %s\n",
 908                wiphy_name(local->hw.wiphy), reason);
 909 #endif
 910
 911         local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
 912         return IEEE80211_CONF_CHANGE_IDLE;
 913 }
 914
 915 static u32 ieee80211_idle_on(struct ieee80211_local *local)
 916 {
 917         if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
 918                 return 0;
 919
 920 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 921         printk(KERN_DEBUG "%s: device now idle\n",
 922                wiphy_name(local->hw.wiphy));
 923 #endif
 924
 925         local->hw.conf.flags |= IEEE80211_CONF_IDLE;
 926         return IEEE80211_CONF_CHANGE_IDLE;
 927 }
 928
 929 u32 __ieee80211_recalc_idle(struct ieee80211_local *local)
 930 {
 931         struct ieee80211_sub_if_data *sdata;
 932         int count = 0;
 933
 934         if (local->hw_scanning || local->sw_scanning)
 935                 return ieee80211_idle_off(local, "scanning");
 936
 937         list_for_each_entry(sdata, &local->interfaces, list) {
 938                 if (!netif_running(sdata->dev))
 939                         continue;
 940                 /* do not count disabled managed interfaces */
 941                 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
 942                     sdata->u.mgd.state == IEEE80211_STA_MLME_DISABLED)
 943                         continue;
 944                 /* do not count unused IBSS interfaces */
 945                 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
 946                     !sdata->u.ibss.ssid_len)
 947                         continue;
 948                 /* count everything else */
 949                 count++;
 950         }
 951
 952         if (!count)
 953                 return ieee80211_idle_on(local);
 954         else
 955                 return ieee80211_idle_off(local, "in use");
 956
 957         return 0;
 958 }
 959
 960 void ieee80211_recalc_idle(struct ieee80211_local *local)
 961 {
 962         u32 chg;
 963
 964         mutex_lock(&local->iflist_mtx);
 965         chg = __ieee80211_recalc_idle(local);
 966         mutex_unlock(&local->iflist_mtx);
 967         if (chg)
 968                 ieee80211_hw_config(local, chg);
 969 }