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         /*
 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                         local->fif_pspoll++;
 226                 }
 227                 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
 228                         local->fif_other_bss++;
 229
 230                 spin_lock_bh(&local->filter_lock);
 231                 ieee80211_configure_filter(local);
 232                 spin_unlock_bh(&local->filter_lock);
 233                 break;
 234         default:
 235                 conf.vif = &sdata->vif;
 236                 conf.type = sdata->vif.type;
 237                 conf.mac_addr = dev->dev_addr;
 238                 res = drv_add_interface(local, &conf);
 239                 if (res)
 240                         goto err_stop;
 241
 242                 if (ieee80211_vif_is_mesh(&sdata->vif)) {
 243                         local->fif_other_bss++;
 244                         spin_lock_bh(&local->filter_lock);
 245                         ieee80211_configure_filter(local);
 246                         spin_unlock_bh(&local->filter_lock);
 247
 248                         ieee80211_start_mesh(sdata);
 249                 } else if (sdata->vif.type == NL80211_IFTYPE_AP) {
 250                         local->fif_pspoll++;
 251
 252                         spin_lock_bh(&local->filter_lock);
 253                         ieee80211_configure_filter(local);
 254                         spin_unlock_bh(&local->filter_lock);
 255                 }
 256
 257                 changed |= ieee80211_reset_erp_info(sdata);
 258                 ieee80211_bss_info_change_notify(sdata, changed);
 259                 ieee80211_enable_keys(sdata);
 260
 261                 if (sdata->vif.type == NL80211_IFTYPE_STATION)
 262                         netif_carrier_off(dev);
 263                 else
 264                         netif_carrier_on(dev);
 265         }
 266
 267         if (sdata->vif.type == NL80211_IFTYPE_WDS) {
 268                 /* Create STA entry for the WDS peer */
 269                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
 270                                      GFP_KERNEL);
 271                 if (!sta) {
 272                         res = -ENOMEM;
 273                         goto err_del_interface;
 274                 }
 275
 276                 /* no locking required since STA is not live yet */
 277                 sta->flags |= WLAN_STA_AUTHORIZED;
 278
 279                 res = sta_info_insert(sta);
 280                 if (res) {
 281                         /* STA has been freed */
 282                         goto err_del_interface;
 283                 }
 284         }
 285
 286         if (local->open_count == 0) {
 287                 tasklet_enable(&local->tx_pending_tasklet);
 288                 tasklet_enable(&local->tasklet);
 289         }
 290
 291         /*
 292          * set_multicast_list will be invoked by the networking core
 293          * which will check whether any increments here were done in
 294          * error and sync them down to the hardware as filter flags.
 295          */
 296         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 297                 atomic_inc(&local->iff_allmultis);
 298
 299         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 300                 atomic_inc(&local->iff_promiscs);
 301
 302         hw_reconf_flags |= __ieee80211_recalc_idle(local);
 303
 304         local->open_count++;
 305         if (hw_reconf_flags) {
 306                 ieee80211_hw_config(local, hw_reconf_flags);
 307                 /*
 308                  * set default queue parameters so drivers don't
 309                  * need to initialise the hardware if the hardware
 310                  * doesn't start up with sane defaults
 311                  */
 312                 ieee80211_set_wmm_default(sdata);
 313         }
 314
 315         ieee80211_recalc_ps(local, -1);
 316
 317         /*
 318          * ieee80211_sta_work is disabled while network interface
 319          * is down. Therefore, some configuration changes may not
 320          * yet be effective. Trigger execution of ieee80211_sta_work
 321          * to fix this.
 322          */
 323         if (sdata->vif.type == NL80211_IFTYPE_STATION)
 324                 ieee80211_queue_work(&local->hw, &sdata->u.mgd.work);
 325
 326         netif_tx_start_all_queues(dev);
 327
 328         return 0;
 329  err_del_interface:
 330         drv_remove_interface(local, &conf);
 331  err_stop:
 332         if (!local->open_count)
 333                 drv_stop(local);
 334  err_del_bss:
 335         sdata->bss = NULL;
 336         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
 337                 list_del(&sdata->u.vlan.list);
 338         return res;
 339 }
 340
 341 static int ieee80211_stop(struct net_device *dev)
 342 {
 343         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 344         struct ieee80211_local *local = sdata->local;
 345         struct ieee80211_if_init_conf conf;
 346         struct sta_info *sta;
 347         unsigned long flags;
 348         struct sk_buff *skb, *tmp;
 349         u32 hw_reconf_flags = 0;
 350         int i;
 351
 352         /*
 353          * Stop TX on this interface first.
 354          */
 355         netif_tx_stop_all_queues(dev);
 356
 357         /*
 358          * Now delete all active aggregation sessions.
 359          */
 360         rcu_read_lock();
 361
 362         list_for_each_entry_rcu(sta, &local->sta_list, list) {
 363                 if (sta->sdata == sdata)
 364                         ieee80211_sta_tear_down_BA_sessions(sta);
 365         }
 366
 367         rcu_read_unlock();
 368
 369         /*
 370          * Remove all stations associated with this interface.
 371          *
 372          * This must be done before calling ops->remove_interface()
 373          * because otherwise we can later invoke ops->sta_notify()
 374          * whenever the STAs are removed, and that invalidates driver
 375          * assumptions about always getting a vif pointer that is valid
 376          * (because if we remove a STA after ops->remove_interface()
 377          * the driver will have removed the vif info already!)
 378          *
 379          * We could relax this and only unlink the stations from the
 380          * hash table and list but keep them on a per-sdata list that
 381          * will be inserted back again when the interface is brought
 382          * up again, but I don't currently see a use case for that,
 383          * except with WDS which gets a STA entry created when it is
 384          * brought up.
 385          */
 386         sta_info_flush(local, sdata);
 387
 388         /*
 389          * Don't count this interface for promisc/allmulti while it
 390          * is down. dev_mc_unsync() will invoke set_multicast_list
 391          * on the master interface which will sync these down to the
 392          * hardware as filter flags.
 393          */
 394         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 395                 atomic_dec(&local->iff_allmultis);
 396
 397         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 398                 atomic_dec(&local->iff_promiscs);
 399
 400         if (sdata->vif.type == NL80211_IFTYPE_AP)
 401                 local->fif_pspoll--;
 402
 403         netif_addr_lock_bh(dev);
 404         spin_lock_bh(&local->filter_lock);
 405         __dev_addr_unsync(&local->mc_list, &local->mc_count,
 406                           &dev->mc_list, &dev->mc_count);
 407         ieee80211_configure_filter(local);
 408         spin_unlock_bh(&local->filter_lock);
 409         netif_addr_unlock_bh(dev);
 410
 411         del_timer_sync(&local->dynamic_ps_timer);
 412         cancel_work_sync(&local->dynamic_ps_enable_work);
 413
 414         /* APs need special treatment */
 415         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 416                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
 417                 struct beacon_data *old_beacon = sdata->u.ap.beacon;
 418
 419                 /* remove beacon */
 420                 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
 421                 synchronize_rcu();
 422                 kfree(old_beacon);
 423
 424                 /* down all dependent devices, that is VLANs */
 425                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
 426                                          u.vlan.list)
 427                         dev_close(vlan->dev);
 428                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
 429         }
 430
 431         local->open_count--;
 432
 433         switch (sdata->vif.type) {
 434         case NL80211_IFTYPE_AP_VLAN:
 435                 list_del(&sdata->u.vlan.list);
 436                 /* no need to tell driver */
 437                 break;
 438         case NL80211_IFTYPE_MONITOR:
 439                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 440                         local->cooked_mntrs--;
 441                         break;
 442                 }
 443
 444                 local->monitors--;
 445                 if (local->monitors == 0) {
 446                         local->hw.conf.flags &= ~IEEE80211_CONF_RADIOTAP;
 447                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_RADIOTAP;
 448                 }
 449
 450                 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
 451                         local->fif_fcsfail--;
 452                 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
 453                         local->fif_plcpfail--;
 454                 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL) {
 455                         local->fif_pspoll--;
 456                         local->fif_control--;
 457                 }
 458                 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
 459                         local->fif_other_bss--;
 460
 461                 spin_lock_bh(&local->filter_lock);
 462                 ieee80211_configure_filter(local);
 463                 spin_unlock_bh(&local->filter_lock);
 464                 break;
 465         case NL80211_IFTYPE_STATION:
 466                 del_timer_sync(&sdata->u.mgd.chswitch_timer);
 467                 del_timer_sync(&sdata->u.mgd.timer);
 468                 del_timer_sync(&sdata->u.mgd.conn_mon_timer);
 469                 del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
 470                 /*
 471                  * If any of the timers fired while we waited for it, it will
 472                  * have queued its work. Now the work will be running again
 473                  * but will not rearm the timer again because it checks
 474                  * whether the interface is running, which, at this point,
 475                  * it no longer is.
 476                  */
 477                 cancel_work_sync(&sdata->u.mgd.work);
 478                 cancel_work_sync(&sdata->u.mgd.chswitch_work);
 479                 cancel_work_sync(&sdata->u.mgd.monitor_work);
 480                 cancel_work_sync(&sdata->u.mgd.beacon_loss_work);
 481
 482                 /*
 483                  * When we get here, the interface is marked down.
 484                  * Call synchronize_rcu() to wait for the RX path
 485                  * should it be using the interface and enqueuing
 486                  * frames at this very time on another CPU.
 487                  */
 488                 synchronize_rcu();
 489                 skb_queue_purge(&sdata->u.mgd.skb_queue);
 490                 /* fall through */
 491         case NL80211_IFTYPE_ADHOC:
 492                 if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 493                         del_timer_sync(&sdata->u.ibss.timer);
 494                         cancel_work_sync(&sdata->u.ibss.work);
 495                         synchronize_rcu();
 496                         skb_queue_purge(&sdata->u.ibss.skb_queue);
 497                 }
 498                 /* fall through */
 499         case NL80211_IFTYPE_MESH_POINT:
 500                 if (ieee80211_vif_is_mesh(&sdata->vif)) {
 501                         /* other_bss and allmulti are always set on mesh
 502                          * ifaces */
 503                         local->fif_other_bss--;
 504                         atomic_dec(&local->iff_allmultis);
 505
 506                         spin_lock_bh(&local->filter_lock);
 507                         ieee80211_configure_filter(local);
 508                         spin_unlock_bh(&local->filter_lock);
 509
 510                         ieee80211_stop_mesh(sdata);
 511                 }
 512                 /* fall through */
 513         default:
 514                 if (local->scan_sdata == sdata) {
 515                         if (!local->ops->hw_scan)
 516                                 cancel_delayed_work_sync(&local->scan_work);
 517                         /*
 518                          * The software scan can no longer run now, so we can
 519                          * clear out the scan_sdata reference. However, the
 520                          * hardware scan may still be running. The complete
 521                          * function must be prepared to handle a NULL value.
 522                          */
 523                         local->scan_sdata = NULL;
 524                         /*
 525                          * The memory barrier guarantees that another CPU
 526                          * that is hardware-scanning will now see the fact
 527                          * that this interface is gone.
 528                          */
 529                         smp_mb();
 530                         /*
 531                          * If software scanning, complete the scan but since
 532                          * the scan_sdata is NULL already don't send out a
 533                          * scan event to userspace -- the scan is incomplete.
 534                          */
 535                         if (test_bit(SCAN_SW_SCANNING, &local->scanning))
 536                                 ieee80211_scan_completed(&local->hw, true);
 537                 }
 538
 539                 /*
 540                  * Disable beaconing for AP and mesh, IBSS can't
 541                  * still be joined to a network at this point.
 542                  */
 543                 if (sdata->vif.type == NL80211_IFTYPE_AP ||
 544                     sdata->vif.type == NL80211_IFTYPE_MESH_POINT) {
 545                         ieee80211_bss_info_change_notify(sdata,
 546                                 BSS_CHANGED_BEACON_ENABLED);
 547                 }
 548
 549                 conf.vif = &sdata->vif;
 550                 conf.type = sdata->vif.type;
 551                 conf.mac_addr = dev->dev_addr;
 552                 /* disable all keys for as long as this netdev is down */
 553                 ieee80211_disable_keys(sdata);
 554                 drv_remove_interface(local, &conf);
 555         }
 556
 557         sdata->bss = NULL;
 558
 559         hw_reconf_flags |= __ieee80211_recalc_idle(local);
 560
 561         ieee80211_recalc_ps(local, -1);
 562
 563         if (local->open_count == 0) {
 564                 drv_stop(local);
 565
 566                 ieee80211_led_radio(local, false);
 567
 568                 flush_workqueue(local->workqueue);
 569
 570                 tasklet_disable(&local->tx_pending_tasklet);
 571                 tasklet_disable(&local->tasklet);
 572
 573                 /* no reconfiguring after stop! */
 574                 hw_reconf_flags = 0;
 575         }
 576
 577         /* do after stop to avoid reconfiguring when we stop anyway */
 578         if (hw_reconf_flags)
 579                 ieee80211_hw_config(local, hw_reconf_flags);
 580
 581         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 582         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 583                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
 584                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 585                         if (info->control.vif == &sdata->vif) {
 586                                 __skb_unlink(skb, &local->pending[i]);
 587                                 dev_kfree_skb_irq(skb);
 588                         }
 589                 }
 590         }
 591         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 592
 593         return 0;
 594 }
 595
 596 static void ieee80211_set_multicast_list(struct net_device *dev)
 597 {
 598         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 599         struct ieee80211_local *local = sdata->local;
 600         int allmulti, promisc, sdata_allmulti, sdata_promisc;
 601
 602         allmulti = !!(dev->flags & IFF_ALLMULTI);
 603         promisc = !!(dev->flags & IFF_PROMISC);
 604         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
 605         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
 606
 607         if (allmulti != sdata_allmulti) {
 608                 if (dev->flags & IFF_ALLMULTI)
 609                         atomic_inc(&local->iff_allmultis);
 610                 else
 611                         atomic_dec(&local->iff_allmultis);
 612                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
 613         }
 614
 615         if (promisc != sdata_promisc) {
 616                 if (dev->flags & IFF_PROMISC)
 617                         atomic_inc(&local->iff_promiscs);
 618                 else
 619                         atomic_dec(&local->iff_promiscs);
 620                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
 621         }
 622         spin_lock_bh(&local->filter_lock);
 623         __dev_addr_sync(&local->mc_list, &local->mc_count,
 624                         &dev->mc_list, &dev->mc_count);
 625         ieee80211_configure_filter(local);
 626         spin_unlock_bh(&local->filter_lock);
 627 }
 628
 629 /*
 630  * Called when the netdev is removed or, by the code below, before
 631  * the interface type changes.
 632  */
 633 static void ieee80211_teardown_sdata(struct net_device *dev)
 634 {
 635         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 636         struct ieee80211_local *local = sdata->local;
 637         struct beacon_data *beacon;
 638         struct sk_buff *skb;
 639         int flushed;
 640         int i;
 641
 642         /* free extra data */
 643         ieee80211_free_keys(sdata);
 644
 645         ieee80211_debugfs_remove_netdev(sdata);
 646
 647         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
 648                 __skb_queue_purge(&sdata->fragments[i].skb_list);
 649         sdata->fragment_next = 0;
 650
 651         switch (sdata->vif.type) {
 652         case NL80211_IFTYPE_AP:
 653                 beacon = sdata->u.ap.beacon;
 654                 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
 655                 synchronize_rcu();
 656                 kfree(beacon);
 657
 658                 while ((skb = skb_dequeue(&sdata->u.ap.ps_bc_buf))) {
 659                         local->total_ps_buffered--;
 660                         dev_kfree_skb(skb);
 661                 }
 662
 663                 break;
 664         case NL80211_IFTYPE_MESH_POINT:
 665                 if (ieee80211_vif_is_mesh(&sdata->vif))
 666                         mesh_rmc_free(sdata);
 667                 break;
 668         case NL80211_IFTYPE_ADHOC:
 669                 if (WARN_ON(sdata->u.ibss.presp))
 670                         kfree_skb(sdata->u.ibss.presp);
 671                 break;
 672         case NL80211_IFTYPE_STATION:
 673         case NL80211_IFTYPE_WDS:
 674         case NL80211_IFTYPE_AP_VLAN:
 675         case NL80211_IFTYPE_MONITOR:
 676                 break;
 677         case NL80211_IFTYPE_UNSPECIFIED:
 678         case __NL80211_IFTYPE_AFTER_LAST:
 679                 BUG();
 680                 break;
 681         }
 682
 683         flushed = sta_info_flush(local, sdata);
 684         WARN_ON(flushed);
 685 }
 686
 687 static const struct net_device_ops ieee80211_dataif_ops = {
 688         .ndo_open               = ieee80211_open,
 689         .ndo_stop               = ieee80211_stop,
 690         .ndo_uninit             = ieee80211_teardown_sdata,
 691         .ndo_start_xmit         = ieee80211_subif_start_xmit,
 692         .ndo_set_multicast_list = ieee80211_set_multicast_list,
 693         .ndo_change_mtu         = ieee80211_change_mtu,
 694         .ndo_set_mac_address    = eth_mac_addr,
 695 };
 696
 697 static const struct net_device_ops ieee80211_monitorif_ops = {
 698         .ndo_open               = ieee80211_open,
 699         .ndo_stop               = ieee80211_stop,
 700         .ndo_uninit             = ieee80211_teardown_sdata,
 701         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
 702         .ndo_set_multicast_list = ieee80211_set_multicast_list,
 703         .ndo_change_mtu         = ieee80211_change_mtu,
 704         .ndo_set_mac_address    = eth_mac_addr,
 705 };
 706
 707 static void ieee80211_if_setup(struct net_device *dev)
 708 {
 709         ether_setup(dev);
 710         dev->netdev_ops = &ieee80211_dataif_ops;
 711         dev->destructor = free_netdev;
 712 }
 713
 714 /*
 715  * Helper function to initialise an interface to a specific type.
 716  */
 717 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
 718                                   enum nl80211_iftype type)
 719 {
 720         /* clear type-dependent union */
 721         memset(&sdata->u, 0, sizeof(sdata->u));
 722
 723         /* and set some type-dependent values */
 724         sdata->vif.type = type;
 725         sdata->dev->netdev_ops = &ieee80211_dataif_ops;
 726         sdata->wdev.iftype = type;
 727
 728         /* only monitor differs */
 729         sdata->dev->type = ARPHRD_ETHER;
 730
 731         switch (type) {
 732         case NL80211_IFTYPE_AP:
 733                 skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
 734                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
 735                 break;
 736         case NL80211_IFTYPE_STATION:
 737                 ieee80211_sta_setup_sdata(sdata);
 738                 break;
 739         case NL80211_IFTYPE_ADHOC:
 740                 ieee80211_ibss_setup_sdata(sdata);
 741                 break;
 742         case NL80211_IFTYPE_MESH_POINT:
 743                 if (ieee80211_vif_is_mesh(&sdata->vif))
 744                         ieee80211_mesh_init_sdata(sdata);
 745                 break;
 746         case NL80211_IFTYPE_MONITOR:
 747                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
 748                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
 749                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
 750                                       MONITOR_FLAG_OTHER_BSS;
 751                 break;
 752         case NL80211_IFTYPE_WDS:
 753         case NL80211_IFTYPE_AP_VLAN:
 754                 break;
 755         case NL80211_IFTYPE_UNSPECIFIED:
 756         case __NL80211_IFTYPE_AFTER_LAST:
 757                 BUG();
 758                 break;
 759         }
 760
 761         ieee80211_debugfs_add_netdev(sdata);
 762 }
 763
 764 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
 765                              enum nl80211_iftype type)
 766 {
 767         ASSERT_RTNL();
 768
 769         if (type == sdata->vif.type)
 770                 return 0;
 771
 772         /* Setting ad-hoc mode on non-IBSS channel is not supported. */
 773         if (sdata->local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS &&
 774             type == NL80211_IFTYPE_ADHOC)
 775                 return -EOPNOTSUPP;
 776
 777         /*
 778          * We could, here, on changes between IBSS/STA/MESH modes,
 779          * invoke an MLME function instead that disassociates etc.
 780          * and goes into the requested mode.
 781          */
 782
 783         if (netif_running(sdata->dev))
 784                 return -EBUSY;
 785
 786         /* Purge and reset type-dependent state. */
 787         ieee80211_teardown_sdata(sdata->dev);
 788         ieee80211_setup_sdata(sdata, type);
 789
 790         /* reset some values that shouldn't be kept across type changes */
 791         sdata->vif.bss_conf.basic_rates =
 792                 ieee80211_mandatory_rates(sdata->local,
 793                         sdata->local->hw.conf.channel->band);
 794         sdata->drop_unencrypted = 0;
 795
 796         return 0;
 797 }
 798
 799 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
 800                      struct net_device **new_dev, enum nl80211_iftype type,
 801                      struct vif_params *params)
 802 {
 803         struct net_device *ndev;
 804         struct ieee80211_sub_if_data *sdata = NULL;
 805         int ret, i;
 806
 807         ASSERT_RTNL();
 808
 809         ndev = alloc_netdev(sizeof(*sdata) + local->hw.vif_data_size,
 810                             name, ieee80211_if_setup);
 811         if (!ndev)
 812                 return -ENOMEM;
 813         dev_net_set(ndev, wiphy_net(local->hw.wiphy));
 814
 815         ndev->needed_headroom = local->tx_headroom +
 816                                 4*6 /* four MAC addresses */
 817                                 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
 818                                 + 6 /* mesh */
 819                                 + 8 /* rfc1042/bridge tunnel */
 820                                 - ETH_HLEN /* ethernet hard_header_len */
 821                                 + IEEE80211_ENCRYPT_HEADROOM;
 822         ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
 823
 824         ret = dev_alloc_name(ndev, ndev->name);
 825         if (ret < 0)
 826                 goto fail;
 827
 828         memcpy(ndev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
 829         SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
 830
 831         /* don't use IEEE80211_DEV_TO_SUB_IF because it checks too much */
 832         sdata = netdev_priv(ndev);
 833         ndev->ieee80211_ptr = &sdata->wdev;
 834
 835         /* initialise type-independent data */
 836         sdata->wdev.wiphy = local->hw.wiphy;
 837         sdata->local = local;
 838         sdata->dev = ndev;
 839
 840         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
 841                 skb_queue_head_init(&sdata->fragments[i].skb_list);
 842
 843         INIT_LIST_HEAD(&sdata->key_list);
 844
 845         sdata->force_unicast_rateidx = -1;
 846         sdata->max_ratectrl_rateidx = -1;
 847
 848         /* setup type-dependent data */
 849         ieee80211_setup_sdata(sdata, type);
 850
 851         ret = register_netdevice(ndev);
 852         if (ret)
 853                 goto fail;
 854
 855         if (ieee80211_vif_is_mesh(&sdata->vif) &&
 856             params && params->mesh_id_len)
 857                 ieee80211_sdata_set_mesh_id(sdata,
 858                                             params->mesh_id_len,
 859                                             params->mesh_id);
 860
 861         mutex_lock(&local->iflist_mtx);
 862         list_add_tail_rcu(&sdata->list, &local->interfaces);
 863         mutex_unlock(&local->iflist_mtx);
 864
 865         if (new_dev)
 866                 *new_dev = ndev;
 867
 868         return 0;
 869
 870  fail:
 871         free_netdev(ndev);
 872         return ret;
 873 }
 874
 875 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
 876 {
 877         ASSERT_RTNL();
 878
 879         mutex_lock(&sdata->local->iflist_mtx);
 880         list_del_rcu(&sdata->list);
 881         mutex_unlock(&sdata->local->iflist_mtx);
 882
 883         synchronize_rcu();
 884         unregister_netdevice(sdata->dev);
 885 }
 886
 887 /*
 888  * Remove all interfaces, may only be called at hardware unregistration
 889  * time because it doesn't do RCU-safe list removals.
 890  */
 891 void ieee80211_remove_interfaces(struct ieee80211_local *local)
 892 {
 893         struct ieee80211_sub_if_data *sdata, *tmp;
 894
 895         ASSERT_RTNL();
 896
 897         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
 898                 /*
 899                  * we cannot hold the iflist_mtx across unregister_netdevice,
 900                  * but we only need to hold it for list modifications to lock
 901                  * out readers since we're under the RTNL here as all other
 902                  * writers.
 903                  */
 904                 mutex_lock(&local->iflist_mtx);
 905                 list_del(&sdata->list);
 906                 mutex_unlock(&local->iflist_mtx);
 907
 908                 unregister_netdevice(sdata->dev);
 909         }
 910 }
 911
 912 static u32 ieee80211_idle_off(struct ieee80211_local *local,
 913                               const char *reason)
 914 {
 915         if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
 916                 return 0;
 917
 918 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 919         printk(KERN_DEBUG "%s: device no longer idle - %s\n",
 920                wiphy_name(local->hw.wiphy), reason);
 921 #endif
 922
 923         local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
 924         return IEEE80211_CONF_CHANGE_IDLE;
 925 }
 926
 927 static u32 ieee80211_idle_on(struct ieee80211_local *local)
 928 {
 929         if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
 930                 return 0;
 931
 932 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 933         printk(KERN_DEBUG "%s: device now idle\n",
 934                wiphy_name(local->hw.wiphy));
 935 #endif
 936
 937         local->hw.conf.flags |= IEEE80211_CONF_IDLE;
 938         return IEEE80211_CONF_CHANGE_IDLE;
 939 }
 940
 941 u32 __ieee80211_recalc_idle(struct ieee80211_local *local)
 942 {
 943         struct ieee80211_sub_if_data *sdata;
 944         int count = 0;
 945
 946         if (local->scanning)
 947                 return ieee80211_idle_off(local, "scanning");
 948
 949         list_for_each_entry(sdata, &local->interfaces, list) {
 950                 if (!netif_running(sdata->dev))
 951                         continue;
 952                 /* do not count disabled managed interfaces */
 953                 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
 954                     !sdata->u.mgd.associated &&
 955                     list_empty(&sdata->u.mgd.work_list))
 956                         continue;
 957                 /* do not count unused IBSS interfaces */
 958                 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
 959                     !sdata->u.ibss.ssid_len)
 960                         continue;
 961                 /* count everything else */
 962                 count++;
 963         }
 964
 965         if (!count)
 966                 return ieee80211_idle_on(local);
 967         else
 968                 return ieee80211_idle_off(local, "in use");
 969
 970         return 0;
 971 }
 972
 973 void ieee80211_recalc_idle(struct ieee80211_local *local)
 974 {
 975         u32 chg;
 976
 977         mutex_lock(&local->iflist_mtx);
 978         chg = __ieee80211_recalc_idle(local);
 979         mutex_unlock(&local->iflist_mtx);
 980         if (chg)
 981                 ieee80211_hw_config(local, chg);
 982 }