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   1 /*
   2  * Interface handling (except master interface)
   3  *
   4  * Copyright 2002-2005, Instant802 Networks, Inc.
   5  * Copyright 2005-2006, Devicescape Software, Inc.
   6  * Copyright (c) 2006 Jiri Benc <jbenc@suse.cz>
   7  * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13 #include <linux/kernel.h>
  14 #include <linux/if_arp.h>
  15 #include <linux/netdevice.h>
  16 #include <linux/rtnetlink.h>
  17 #include <net/mac80211.h>
  18 #include "ieee80211_i.h"
  19 #include "sta_info.h"
  20 #include "debugfs_netdev.h"
  21 #include "mesh.h"
  22 #include "led.h"
  23 #include "driver-ops.h"
  24
  25 /**
  26  * DOC: Interface list locking
  27  *
  28  * The interface list in each struct ieee80211_local is protected
  29  * three-fold:
  30  *
  31  * (1) modifications may only be done under the RTNL
  32  * (2) modifications and readers are protected against each other by
  33  *     the iflist_mtx.
  34  * (3) modifications are done in an RCU manner so atomic readers
  35  *     can traverse the list in RCU-safe blocks.
  36  *
  37  * As a consequence, reads (traversals) of the list can be protected
  38  * by either the RTNL, the iflist_mtx or RCU.
  39  */
  40
  41
  42 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
  43 {
  44         int meshhdrlen;
  45         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
  46
  47         meshhdrlen = (sdata->vif.type == NL80211_IFTYPE_MESH_POINT) ? 5 : 0;
  48
  49         /* FIX: what would be proper limits for MTU?
  50          * This interface uses 802.3 frames. */
  51         if (new_mtu < 256 ||
  52             new_mtu > IEEE80211_MAX_DATA_LEN - 24 - 6 - meshhdrlen) {
  53                 return -EINVAL;
  54         }
  55
  56 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
  57         printk(KERN_DEBUG "%s: setting MTU %d\n", dev->name, new_mtu);
  58 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
  59         dev->mtu = new_mtu;
  60         return 0;
  61 }
  62
  63 static inline int identical_mac_addr_allowed(int type1, int type2)
  64 {
  65         return type1 == NL80211_IFTYPE_MONITOR ||
  66                 type2 == NL80211_IFTYPE_MONITOR ||
  67                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
  68                 (type1 == NL80211_IFTYPE_WDS &&
  69                         (type2 == NL80211_IFTYPE_WDS ||
  70                          type2 == NL80211_IFTYPE_AP)) ||
  71                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
  72                 (type1 == NL80211_IFTYPE_AP_VLAN &&
  73                         (type2 == NL80211_IFTYPE_AP ||
  74                          type2 == NL80211_IFTYPE_AP_VLAN));
  75 }
  76
  77 static int ieee80211_open(struct net_device *dev)
  78 {
  79         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
  80         struct ieee80211_sub_if_data *nsdata;
  81         struct ieee80211_local *local = sdata->local;
  82         struct sta_info *sta;
  83         struct ieee80211_if_init_conf conf;
  84         u32 changed = 0;
  85         int res;
  86         u32 hw_reconf_flags = 0;
  87         u8 null_addr[ETH_ALEN] = {0};
  88
  89         /* fail early if user set an invalid address */
  90         if (compare_ether_addr(dev->dev_addr, null_addr) &&
  91             !is_valid_ether_addr(dev->dev_addr))
  92                 return -EADDRNOTAVAIL;
  93
  94         /* we hold the RTNL here so can safely walk the list */
  95         list_for_each_entry(nsdata, &local->interfaces, list) {
  96                 struct net_device *ndev = nsdata->dev;
  97
  98                 if (ndev != dev && netif_running(ndev)) {
  99                         /*
 100                          * Allow only a single IBSS interface to be up at any
 101                          * time. This is restricted because beacon distribution
 102                          * cannot work properly if both are in the same IBSS.
 103                          *
 104                          * To remove this restriction we'd have to disallow them
 105                          * from setting the same SSID on different IBSS interfaces
 106                          * belonging to the same hardware. Then, however, we're
 107                          * faced with having to adopt two different TSF timers...
 108                          */
 109                         if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
 110                             nsdata->vif.type == NL80211_IFTYPE_ADHOC)
 111                                 return -EBUSY;
 112
 113                         /*
 114                          * The remaining checks are only performed for interfaces
 115                          * with the same MAC address.
 116                          */
 117                         if (compare_ether_addr(dev->dev_addr, ndev->dev_addr))
 118                                 continue;
 119
 120                         /*
 121                          * check whether it may have the same address
 122                          */
 123                         if (!identical_mac_addr_allowed(sdata->vif.type,
 124                                                         nsdata->vif.type))
 125                                 return -ENOTUNIQ;
 126
 127                         /*
 128                          * can only add VLANs to enabled APs
 129                          */
 130                         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
 131                             nsdata->vif.type == NL80211_IFTYPE_AP)
 132                                 sdata->bss = &nsdata->u.ap;
 133                 }
 134         }
 135
 136         switch (sdata->vif.type) {
 137         case NL80211_IFTYPE_WDS:
 138                 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
 139                         return -ENOLINK;
 140                 break;
 141         case NL80211_IFTYPE_AP_VLAN:
 142                 if (!sdata->bss)
 143                         return -ENOLINK;
 144                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
 145                 break;
 146         case NL80211_IFTYPE_AP:
 147                 sdata->bss = &sdata->u.ap;
 148                 break;
 149         case NL80211_IFTYPE_MESH_POINT:
 150                 if (!ieee80211_vif_is_mesh(&sdata->vif))
 151                         break;
 152                 /* mesh ifaces must set allmulti to forward mcast traffic */
 153                 atomic_inc(&local->iff_allmultis);
 154                 break;
 155         case NL80211_IFTYPE_STATION:
 156         case NL80211_IFTYPE_MONITOR:
 157         case NL80211_IFTYPE_ADHOC:
 158                 /* no special treatment */
 159                 break;
 160         case NL80211_IFTYPE_UNSPECIFIED:
 161         case __NL80211_IFTYPE_AFTER_LAST:
 162                 /* cannot happen */
 163                 WARN_ON(1);
 164                 break;
 165         }
 166
 167         if (local->open_count == 0) {
 168                 res = drv_start(local);
 169                 if (res)
 170                         goto err_del_bss;
 171                 /* we're brought up, everything changes */
 172                 hw_reconf_flags = ~0;
 173                 ieee80211_led_radio(local, true);
 174         }
 175
 176         /*
 177          * Check all interfaces and copy the hopefully now-present
 178          * MAC address to those that have the special null one.
 179          */
 180         list_for_each_entry(nsdata, &local->interfaces, list) {
 181                 struct net_device *ndev = nsdata->dev;
 182
 183                 /*
 184                  * No need to check netif_running since we do not allow
 185                  * it to start up with this invalid address.
 186                  */
 187                 if (compare_ether_addr(null_addr, ndev->dev_addr) == 0)
 188                         memcpy(ndev->dev_addr,
 189                                local->hw.wiphy->perm_addr,
 190                                ETH_ALEN);
 191         }
 192
 193         /*
 194          * Validate the MAC address for this device.
 195          */
 196         if (!is_valid_ether_addr(dev->dev_addr)) {
 197                 if (!local->open_count)
 198                         drv_stop(local);
 199                 return -EADDRNOTAVAIL;
 200         }
 201
 202         switch (sdata->vif.type) {
 203         case NL80211_IFTYPE_AP_VLAN:
 204                 /* no need to tell driver */
 205                 break;
 206         case NL80211_IFTYPE_MONITOR:
 207                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 208                         local->cooked_mntrs++;
 209                         break;
 210                 }
 211
 212                 /* must be before the call to ieee80211_configure_filter */
 213                 local->monitors++;
 214                 if (local->monitors == 1) {
 215                         local->hw.conf.flags |= IEEE80211_CONF_RADIOTAP;
 216                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_RADIOTAP;
 217                 }
 218
 219                 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
 220                         local->fif_fcsfail++;
 221                 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
 222                         local->fif_plcpfail++;
 223                 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL)
 224                         local->fif_control++;
 225                 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
 226                         local->fif_other_bss++;
 227
 228                 spin_lock_bh(&local->filter_lock);
 229                 ieee80211_configure_filter(local);
 230                 spin_unlock_bh(&local->filter_lock);
 231                 break;
 232         default:
 233                 conf.vif = &sdata->vif;
 234                 conf.type = sdata->vif.type;
 235                 conf.mac_addr = dev->dev_addr;
 236                 res = drv_add_interface(local, &conf);
 237                 if (res)
 238                         goto err_stop;
 239
 240                 if (ieee80211_vif_is_mesh(&sdata->vif)) {
 241                         local->fif_other_bss++;
 242                         spin_lock_bh(&local->filter_lock);
 243                         ieee80211_configure_filter(local);
 244                         spin_unlock_bh(&local->filter_lock);
 245
 246                         ieee80211_start_mesh(sdata);
 247                 }
 248                 changed |= ieee80211_reset_erp_info(sdata);
 249                 ieee80211_bss_info_change_notify(sdata, changed);
 250                 ieee80211_enable_keys(sdata);
 251
 252                 if (sdata->vif.type == NL80211_IFTYPE_STATION)
 253                         netif_carrier_off(dev);
 254                 else
 255                         netif_carrier_on(dev);
 256         }
 257
 258         if (sdata->vif.type == NL80211_IFTYPE_WDS) {
 259                 /* Create STA entry for the WDS peer */
 260                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
 261                                      GFP_KERNEL);
 262                 if (!sta) {
 263                         res = -ENOMEM;
 264                         goto err_del_interface;
 265                 }
 266
 267                 /* no locking required since STA is not live yet */
 268                 sta->flags |= WLAN_STA_AUTHORIZED;
 269
 270                 res = sta_info_insert(sta);
 271                 if (res) {
 272                         /* STA has been freed */
 273                         goto err_del_interface;
 274                 }
 275         }
 276
 277         if (local->open_count == 0) {
 278                 tasklet_enable(&local->tx_pending_tasklet);
 279                 tasklet_enable(&local->tasklet);
 280         }
 281
 282         /*
 283          * set_multicast_list will be invoked by the networking core
 284          * which will check whether any increments here were done in
 285          * error and sync them down to the hardware as filter flags.
 286          */
 287         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 288                 atomic_inc(&local->iff_allmultis);
 289
 290         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 291                 atomic_inc(&local->iff_promiscs);
 292
 293         hw_reconf_flags |= __ieee80211_recalc_idle(local);
 294
 295         local->open_count++;
 296         if (hw_reconf_flags) {
 297                 ieee80211_hw_config(local, hw_reconf_flags);
 298                 /*
 299                  * set default queue parameters so drivers don't
 300                  * need to initialise the hardware if the hardware
 301                  * doesn't start up with sane defaults
 302                  */
 303                 ieee80211_set_wmm_default(sdata);
 304         }
 305
 306         ieee80211_recalc_ps(local, -1);
 307
 308         /*
 309          * ieee80211_sta_work is disabled while network interface
 310          * is down. Therefore, some configuration changes may not
 311          * yet be effective. Trigger execution of ieee80211_sta_work
 312          * to fix this.
 313          */
 314         if (sdata->vif.type == NL80211_IFTYPE_STATION)
 315                 queue_work(local->hw.workqueue, &sdata->u.mgd.work);
 316
 317         netif_tx_start_all_queues(dev);
 318
 319         return 0;
 320  err_del_interface:
 321         drv_remove_interface(local, &conf);
 322  err_stop:
 323         if (!local->open_count)
 324                 drv_stop(local);
 325  err_del_bss:
 326         sdata->bss = NULL;
 327         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
 328                 list_del(&sdata->u.vlan.list);
 329         return res;
 330 }
 331
 332 static int ieee80211_stop(struct net_device *dev)
 333 {
 334         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 335         struct ieee80211_local *local = sdata->local;
 336         struct ieee80211_if_init_conf conf;
 337         struct sta_info *sta;
 338         unsigned long flags;
 339         struct sk_buff *skb, *tmp;
 340         u32 hw_reconf_flags = 0;
 341         int i;
 342
 343         /*
 344          * Stop TX on this interface first.
 345          */
 346         netif_tx_stop_all_queues(dev);
 347
 348         /*
 349          * Now delete all active aggregation sessions.
 350          */
 351         rcu_read_lock();
 352
 353         list_for_each_entry_rcu(sta, &local->sta_list, list) {
 354                 if (sta->sdata == sdata)
 355                         ieee80211_sta_tear_down_BA_sessions(sta);
 356         }
 357
 358         rcu_read_unlock();
 359
 360         /*
 361          * Remove all stations associated with this interface.
 362          *
 363          * This must be done before calling ops->remove_interface()
 364          * because otherwise we can later invoke ops->sta_notify()
 365          * whenever the STAs are removed, and that invalidates driver
 366          * assumptions about always getting a vif pointer that is valid
 367          * (because if we remove a STA after ops->remove_interface()
 368          * the driver will have removed the vif info already!)
 369          *
 370          * We could relax this and only unlink the stations from the
 371          * hash table and list but keep them on a per-sdata list that
 372          * will be inserted back again when the interface is brought
 373          * up again, but I don't currently see a use case for that,
 374          * except with WDS which gets a STA entry created when it is
 375          * brought up.
 376          */
 377         sta_info_flush(local, sdata);
 378
 379         /*
 380          * Don't count this interface for promisc/allmulti while it
 381          * is down. dev_mc_unsync() will invoke set_multicast_list
 382          * on the master interface which will sync these down to the
 383          * hardware as filter flags.
 384          */
 385         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 386                 atomic_dec(&local->iff_allmultis);
 387
 388         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 389                 atomic_dec(&local->iff_promiscs);
 390
 391         netif_addr_lock_bh(dev);
 392         spin_lock_bh(&local->filter_lock);
 393         __dev_addr_unsync(&local->mc_list, &local->mc_count,
 394                           &dev->mc_list, &dev->mc_count);
 395         ieee80211_configure_filter(local);
 396         spin_unlock_bh(&local->filter_lock);
 397         netif_addr_unlock_bh(dev);
 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, *tmp;
 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, tmp, &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_RADIOTAP;
 435                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_RADIOTAP;
 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_control--;
 444                 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
 445                         local->fif_other_bss--;
 446
 447                 spin_lock_bh(&local->filter_lock);
 448                 ieee80211_configure_filter(local);
 449                 spin_unlock_bh(&local->filter_lock);
 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_loss_work);
 467
 468                 /*
 469                  * When we get here, the interface is marked down.
 470                  * Call synchronize_rcu() to wait for the RX path
 471                  * should it be using the interface and enqueuing
 472                  * frames at this very time on another CPU.
 473                  */
 474                 synchronize_rcu();
 475                 skb_queue_purge(&sdata->u.mgd.skb_queue);
 476                 /* fall through */
 477         case NL80211_IFTYPE_ADHOC:
 478                 if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 479                         del_timer_sync(&sdata->u.ibss.timer);
 480                         cancel_work_sync(&sdata->u.ibss.work);
 481                         synchronize_rcu();
 482                         skb_queue_purge(&sdata->u.ibss.skb_queue);
 483                 }
 484                 /* fall through */
 485         case NL80211_IFTYPE_MESH_POINT:
 486                 if (ieee80211_vif_is_mesh(&sdata->vif)) {
 487                         /* other_bss and allmulti are always set on mesh
 488                          * ifaces */
 489                         local->fif_other_bss--;
 490                         atomic_dec(&local->iff_allmultis);
 491
 492                         spin_lock_bh(&local->filter_lock);
 493                         ieee80211_configure_filter(local);
 494                         spin_unlock_bh(&local->filter_lock);
 495
 496                         ieee80211_stop_mesh(sdata);
 497                 }
 498                 /* fall through */
 499         default:
 500                 if (local->scan_sdata == sdata) {
 501                         if (!local->ops->hw_scan)
 502                                 cancel_delayed_work_sync(&local->scan_work);
 503                         /*
 504                          * The software scan can no longer run now, so we can
 505                          * clear out the scan_sdata reference. However, the
 506                          * hardware scan may still be running. The complete
 507                          * function must be prepared to handle a NULL value.
 508                          */
 509                         local->scan_sdata = NULL;
 510                         /*
 511                          * The memory barrier guarantees that another CPU
 512                          * that is hardware-scanning will now see the fact
 513                          * that this interface is gone.
 514                          */
 515                         smp_mb();
 516                         /*
 517                          * If software scanning, complete the scan but since
 518                          * the scan_sdata is NULL already don't send out a
 519                          * scan event to userspace -- the scan is incomplete.
 520                          */
 521                         if (local->sw_scanning)
 522                                 ieee80211_scan_completed(&local->hw, true);
 523                 }
 524
 525                 conf.vif = &sdata->vif;
 526                 conf.type = sdata->vif.type;
 527                 conf.mac_addr = dev->dev_addr;
 528                 /* disable all keys for as long as this netdev is down */
 529                 ieee80211_disable_keys(sdata);
 530                 drv_remove_interface(local, &conf);
 531         }
 532
 533         sdata->bss = NULL;
 534
 535         hw_reconf_flags |= __ieee80211_recalc_idle(local);
 536
 537         ieee80211_recalc_ps(local, -1);
 538
 539         if (local->open_count == 0) {
 540                 drv_stop(local);
 541
 542                 ieee80211_led_radio(local, false);
 543
 544                 flush_workqueue(local->hw.workqueue);
 545
 546                 tasklet_disable(&local->tx_pending_tasklet);
 547                 tasklet_disable(&local->tasklet);
 548
 549                 /* no reconfiguring after stop! */
 550                 hw_reconf_flags = 0;
 551         }
 552
 553         /* do after stop to avoid reconfiguring when we stop anyway */
 554         if (hw_reconf_flags)
 555                 ieee80211_hw_config(local, hw_reconf_flags);
 556
 557         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 558         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 559                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
 560                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 561                         if (info->control.vif == &sdata->vif) {
 562                                 __skb_unlink(skb, &local->pending[i]);
 563                                 dev_kfree_skb_irq(skb);
 564                         }
 565                 }
 566         }
 567         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 568
 569         return 0;
 570 }
 571
 572 static void ieee80211_set_multicast_list(struct net_device *dev)
 573 {
 574         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 575         struct ieee80211_local *local = sdata->local;
 576         int allmulti, promisc, sdata_allmulti, sdata_promisc;
 577
 578         allmulti = !!(dev->flags & IFF_ALLMULTI);
 579         promisc = !!(dev->flags & IFF_PROMISC);
 580         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
 581         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
 582
 583         if (allmulti != sdata_allmulti) {
 584                 if (dev->flags & IFF_ALLMULTI)
 585                         atomic_inc(&local->iff_allmultis);
 586                 else
 587                         atomic_dec(&local->iff_allmultis);
 588                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
 589         }
 590
 591         if (promisc != sdata_promisc) {
 592                 if (dev->flags & IFF_PROMISC)
 593                         atomic_inc(&local->iff_promiscs);
 594                 else
 595                         atomic_dec(&local->iff_promiscs);
 596                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
 597         }
 598         spin_lock_bh(&local->filter_lock);
 599         __dev_addr_sync(&local->mc_list, &local->mc_count,
 600                         &dev->mc_list, &dev->mc_count);
 601         ieee80211_configure_filter(local);
 602         spin_unlock_bh(&local->filter_lock);
 603 }
 604
 605 /*
 606  * Called when the netdev is removed or, by the code below, before
 607  * the interface type changes.
 608  */
 609 static void ieee80211_teardown_sdata(struct net_device *dev)
 610 {
 611         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 612         struct ieee80211_local *local = sdata->local;
 613         struct beacon_data *beacon;
 614         struct sk_buff *skb;
 615         int flushed;
 616         int i;
 617
 618         /* free extra data */
 619         ieee80211_free_keys(sdata);
 620
 621         ieee80211_debugfs_remove_netdev(sdata);
 622
 623         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
 624                 __skb_queue_purge(&sdata->fragments[i].skb_list);
 625         sdata->fragment_next = 0;
 626
 627         switch (sdata->vif.type) {
 628         case NL80211_IFTYPE_AP:
 629                 beacon = sdata->u.ap.beacon;
 630                 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
 631                 synchronize_rcu();
 632                 kfree(beacon);
 633
 634                 while ((skb = skb_dequeue(&sdata->u.ap.ps_bc_buf))) {
 635                         local->total_ps_buffered--;
 636                         dev_kfree_skb(skb);
 637                 }
 638
 639                 break;
 640         case NL80211_IFTYPE_MESH_POINT:
 641                 if (ieee80211_vif_is_mesh(&sdata->vif))
 642                         mesh_rmc_free(sdata);
 643                 break;
 644         case NL80211_IFTYPE_ADHOC:
 645                 if (WARN_ON(sdata->u.ibss.presp))
 646                         kfree_skb(sdata->u.ibss.presp);
 647                 break;
 648         case NL80211_IFTYPE_STATION:
 649         case NL80211_IFTYPE_WDS:
 650         case NL80211_IFTYPE_AP_VLAN:
 651         case NL80211_IFTYPE_MONITOR:
 652                 break;
 653         case NL80211_IFTYPE_UNSPECIFIED:
 654         case __NL80211_IFTYPE_AFTER_LAST:
 655                 BUG();
 656                 break;
 657         }
 658
 659         flushed = sta_info_flush(local, sdata);
 660         WARN_ON(flushed);
 661 }
 662
 663 static const struct net_device_ops ieee80211_dataif_ops = {
 664         .ndo_open               = ieee80211_open,
 665         .ndo_stop               = ieee80211_stop,
 666         .ndo_uninit             = ieee80211_teardown_sdata,
 667         .ndo_start_xmit         = ieee80211_subif_start_xmit,
 668         .ndo_set_multicast_list = ieee80211_set_multicast_list,
 669         .ndo_change_mtu         = ieee80211_change_mtu,
 670         .ndo_set_mac_address    = eth_mac_addr,
 671 };
 672
 673 static const struct net_device_ops ieee80211_monitorif_ops = {
 674         .ndo_open               = ieee80211_open,
 675         .ndo_stop               = ieee80211_stop,
 676         .ndo_uninit             = ieee80211_teardown_sdata,
 677         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
 678         .ndo_set_multicast_list = ieee80211_set_multicast_list,
 679         .ndo_change_mtu         = ieee80211_change_mtu,
 680         .ndo_set_mac_address    = eth_mac_addr,
 681 };
 682
 683 static void ieee80211_if_setup(struct net_device *dev)
 684 {
 685         ether_setup(dev);
 686         dev->netdev_ops = &ieee80211_dataif_ops;
 687         dev->wireless_handlers = &ieee80211_iw_handler_def;
 688         dev->destructor = free_netdev;
 689 }
 690
 691 /*
 692  * Helper function to initialise an interface to a specific type.
 693  */
 694 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
 695                                   enum nl80211_iftype type)
 696 {
 697         /* clear type-dependent union */
 698         memset(&sdata->u, 0, sizeof(sdata->u));
 699
 700         /* and set some type-dependent values */
 701         sdata->vif.type = type;
 702         sdata->dev->netdev_ops = &ieee80211_dataif_ops;
 703         sdata->wdev.iftype = type;
 704
 705         /* only monitor differs */
 706         sdata->dev->type = ARPHRD_ETHER;
 707
 708         switch (type) {
 709         case NL80211_IFTYPE_AP:
 710                 skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
 711                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
 712                 break;
 713         case NL80211_IFTYPE_STATION:
 714                 ieee80211_sta_setup_sdata(sdata);
 715                 break;
 716         case NL80211_IFTYPE_ADHOC:
 717                 ieee80211_ibss_setup_sdata(sdata);
 718                 break;
 719         case NL80211_IFTYPE_MESH_POINT:
 720                 if (ieee80211_vif_is_mesh(&sdata->vif))
 721                         ieee80211_mesh_init_sdata(sdata);
 722                 break;
 723         case NL80211_IFTYPE_MONITOR:
 724                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
 725                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
 726                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
 727                                       MONITOR_FLAG_OTHER_BSS;
 728                 break;
 729         case NL80211_IFTYPE_WDS:
 730         case NL80211_IFTYPE_AP_VLAN:
 731                 break;
 732         case NL80211_IFTYPE_UNSPECIFIED:
 733         case __NL80211_IFTYPE_AFTER_LAST:
 734                 BUG();
 735                 break;
 736         }
 737
 738         ieee80211_debugfs_add_netdev(sdata);
 739 }
 740
 741 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
 742                              enum nl80211_iftype type)
 743 {
 744         ASSERT_RTNL();
 745
 746         if (type == sdata->vif.type)
 747                 return 0;
 748
 749         /* Setting ad-hoc mode on non-IBSS channel is not supported. */
 750         if (sdata->local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS &&
 751             type == NL80211_IFTYPE_ADHOC)
 752                 return -EOPNOTSUPP;
 753
 754         /*
 755          * We could, here, on changes between IBSS/STA/MESH modes,
 756          * invoke an MLME function instead that disassociates etc.
 757          * and goes into the requested mode.
 758          */
 759
 760         if (netif_running(sdata->dev))
 761                 return -EBUSY;
 762
 763         /* Purge and reset type-dependent state. */
 764         ieee80211_teardown_sdata(sdata->dev);
 765         ieee80211_setup_sdata(sdata, type);
 766
 767         /* reset some values that shouldn't be kept across type changes */
 768         sdata->vif.bss_conf.basic_rates =
 769                 ieee80211_mandatory_rates(sdata->local,
 770                         sdata->local->hw.conf.channel->band);
 771         sdata->drop_unencrypted = 0;
 772
 773         return 0;
 774 }
 775
 776 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
 777                      struct net_device **new_dev, enum nl80211_iftype type,
 778                      struct vif_params *params)
 779 {
 780         struct net_device *ndev;
 781         struct ieee80211_sub_if_data *sdata = NULL;
 782         int ret, i;
 783
 784         ASSERT_RTNL();
 785
 786         ndev = alloc_netdev(sizeof(*sdata) + local->hw.vif_data_size,
 787                             name, ieee80211_if_setup);
 788         if (!ndev)
 789                 return -ENOMEM;
 790         dev_net_set(ndev, wiphy_net(local->hw.wiphy));
 791
 792         ndev->needed_headroom = local->tx_headroom +
 793                                 4*6 /* four MAC addresses */
 794                                 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
 795                                 + 6 /* mesh */
 796                                 + 8 /* rfc1042/bridge tunnel */
 797                                 - ETH_HLEN /* ethernet hard_header_len */
 798                                 + IEEE80211_ENCRYPT_HEADROOM;
 799         ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
 800
 801         ret = dev_alloc_name(ndev, ndev->name);
 802         if (ret < 0)
 803                 goto fail;
 804
 805         memcpy(ndev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
 806         SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
 807
 808         /* don't use IEEE80211_DEV_TO_SUB_IF because it checks too much */
 809         sdata = netdev_priv(ndev);
 810         ndev->ieee80211_ptr = &sdata->wdev;
 811
 812         /* initialise type-independent data */
 813         sdata->wdev.wiphy = local->hw.wiphy;
 814         sdata->local = local;
 815         sdata->dev = ndev;
 816
 817         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
 818                 skb_queue_head_init(&sdata->fragments[i].skb_list);
 819
 820         INIT_LIST_HEAD(&sdata->key_list);
 821
 822         sdata->force_unicast_rateidx = -1;
 823         sdata->max_ratectrl_rateidx = -1;
 824
 825         /* setup type-dependent data */
 826         ieee80211_setup_sdata(sdata, type);
 827
 828         ret = register_netdevice(ndev);
 829         if (ret)
 830                 goto fail;
 831
 832         if (ieee80211_vif_is_mesh(&sdata->vif) &&
 833             params && params->mesh_id_len)
 834                 ieee80211_sdata_set_mesh_id(sdata,
 835                                             params->mesh_id_len,
 836                                             params->mesh_id);
 837
 838         mutex_lock(&local->iflist_mtx);
 839         list_add_tail_rcu(&sdata->list, &local->interfaces);
 840         mutex_unlock(&local->iflist_mtx);
 841
 842         if (new_dev)
 843                 *new_dev = ndev;
 844
 845         return 0;
 846
 847  fail:
 848         free_netdev(ndev);
 849         return ret;
 850 }
 851
 852 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
 853 {
 854         ASSERT_RTNL();
 855
 856         mutex_lock(&sdata->local->iflist_mtx);
 857         list_del_rcu(&sdata->list);
 858         mutex_unlock(&sdata->local->iflist_mtx);
 859
 860         synchronize_rcu();
 861         unregister_netdevice(sdata->dev);
 862 }
 863
 864 /*
 865  * Remove all interfaces, may only be called at hardware unregistration
 866  * time because it doesn't do RCU-safe list removals.
 867  */
 868 void ieee80211_remove_interfaces(struct ieee80211_local *local)
 869 {
 870         struct ieee80211_sub_if_data *sdata, *tmp;
 871
 872         ASSERT_RTNL();
 873
 874         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
 875                 /*
 876                  * we cannot hold the iflist_mtx across unregister_netdevice,
 877                  * but we only need to hold it for list modifications to lock
 878                  * out readers since we're under the RTNL here as all other
 879                  * writers.
 880                  */
 881                 mutex_lock(&local->iflist_mtx);
 882                 list_del(&sdata->list);
 883                 mutex_unlock(&local->iflist_mtx);
 884
 885                 unregister_netdevice(sdata->dev);
 886         }
 887 }
 888
 889 static u32 ieee80211_idle_off(struct ieee80211_local *local,
 890                               const char *reason)
 891 {
 892         if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
 893                 return 0;
 894
 895 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 896         printk(KERN_DEBUG "%s: device no longer idle - %s\n",
 897                wiphy_name(local->hw.wiphy), reason);
 898 #endif
 899
 900         local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
 901         return IEEE80211_CONF_CHANGE_IDLE;
 902 }
 903
 904 static u32 ieee80211_idle_on(struct ieee80211_local *local)
 905 {
 906         if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
 907                 return 0;
 908
 909 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 910         printk(KERN_DEBUG "%s: device now idle\n",
 911                wiphy_name(local->hw.wiphy));
 912 #endif
 913
 914         local->hw.conf.flags |= IEEE80211_CONF_IDLE;
 915         return IEEE80211_CONF_CHANGE_IDLE;
 916 }
 917
 918 u32 __ieee80211_recalc_idle(struct ieee80211_local *local)
 919 {
 920         struct ieee80211_sub_if_data *sdata;
 921         int count = 0;
 922
 923         if (local->hw_scanning || local->sw_scanning)
 924                 return ieee80211_idle_off(local, "scanning");
 925
 926         list_for_each_entry(sdata, &local->interfaces, list) {
 927                 if (!netif_running(sdata->dev))
 928                         continue;
 929                 /* do not count disabled managed interfaces */
 930                 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
 931                     !sdata->u.mgd.associated &&
 932                     list_empty(&sdata->u.mgd.work_list))
 933                         continue;
 934                 /* do not count unused IBSS interfaces */
 935                 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
 936                     !sdata->u.ibss.ssid_len)
 937                         continue;
 938                 /* count everything else */
 939                 count++;
 940         }
 941
 942         if (!count)
 943                 return ieee80211_idle_on(local);
 944         else
 945                 return ieee80211_idle_off(local, "in use");
 946
 947         return 0;
 948 }
 949
 950 void ieee80211_recalc_idle(struct ieee80211_local *local)
 951 {
 952         u32 chg;
 953
 954         mutex_lock(&local->iflist_mtx);
 955         chg = __ieee80211_recalc_idle(local);
 956         mutex_unlock(&local->iflist_mtx);
 957         if (chg)
 958                 ieee80211_hw_config(local, chg);
 959 }