net/mac80211/iface.c

   1 /*
   2  * Interface handling (except master interface)
   3  *
   4  * Copyright 2002-2005, Instant802 Networks, Inc.
   5  * Copyright 2005-2006, Devicescape Software, Inc.
   6  * Copyright (c) 2006 Jiri Benc <jbenc@suse.cz>
   7  * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13 #include <linux/slab.h>
  14 #include <linux/kernel.h>
  15 #include <linux/if_arp.h>
  16 #include <linux/netdevice.h>
  17 #include <linux/rtnetlink.h>
  18 #include <net/mac80211.h>
  19 #include <net/ieee80211_radiotap.h>
  20 #include "ieee80211_i.h"
  21 #include "sta_info.h"
  22 #include "debugfs_netdev.h"
  23 #include "mesh.h"
  24 #include "led.h"
  25 #include "driver-ops.h"
  26 #include "wme.h"
  27
  28 /**
  29  * DOC: Interface list locking
  30  *
  31  * The interface list in each struct ieee80211_local is protected
  32  * three-fold:
  33  *
  34  * (1) modifications may only be done under the RTNL
  35  * (2) modifications and readers are protected against each other by
  36  *     the iflist_mtx.
  37  * (3) modifications are done in an RCU manner so atomic readers
  38  *     can traverse the list in RCU-safe blocks.
  39  *
  40  * As a consequence, reads (traversals) of the list can be protected
  41  * by either the RTNL, the iflist_mtx or RCU.
  42  */
  43
  44
  45 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
  46 {
  47         int meshhdrlen;
  48         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
  49
  50         meshhdrlen = (sdata->vif.type == NL80211_IFTYPE_MESH_POINT) ? 5 : 0;
  51
  52         /* FIX: what would be proper limits for MTU?
  53          * This interface uses 802.3 frames. */
  54         if (new_mtu < 256 ||
  55             new_mtu > IEEE80211_MAX_DATA_LEN - 24 - 6 - meshhdrlen) {
  56                 return -EINVAL;
  57         }
  58
  59 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
  60         printk(KERN_DEBUG "%s: setting MTU %d\n", dev->name, new_mtu);
  61 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
  62         dev->mtu = new_mtu;
  63         return 0;
  64 }
  65
  66 static int ieee80211_change_mac(struct net_device *dev, void *addr)
  67 {
  68         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
  69         struct sockaddr *sa = addr;
  70         int ret;
  71
  72         if (ieee80211_sdata_running(sdata))
  73                 return -EBUSY;
  74
  75         ret = eth_mac_addr(dev, sa);
  76
  77         if (ret == 0)
  78                 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
  79
  80         return ret;
  81 }
  82
  83 static inline int identical_mac_addr_allowed(int type1, int type2)
  84 {
  85         return type1 == NL80211_IFTYPE_MONITOR ||
  86                 type2 == NL80211_IFTYPE_MONITOR ||
  87                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
  88                 (type1 == NL80211_IFTYPE_WDS &&
  89                         (type2 == NL80211_IFTYPE_WDS ||
  90                          type2 == NL80211_IFTYPE_AP)) ||
  91                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
  92                 (type1 == NL80211_IFTYPE_AP_VLAN &&
  93                         (type2 == NL80211_IFTYPE_AP ||
  94                          type2 == NL80211_IFTYPE_AP_VLAN));
  95 }
  96
  97 static int ieee80211_open(struct net_device *dev)
  98 {
  99         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 100         struct ieee80211_sub_if_data *nsdata;
 101         struct ieee80211_local *local = sdata->local;
 102         struct sta_info *sta;
 103         u32 changed = 0;
 104         int res;
 105         u32 hw_reconf_flags = 0;
 106         u8 null_addr[ETH_ALEN] = {0};
 107
 108         /* fail early if user set an invalid address */
 109         if (compare_ether_addr(dev->dev_addr, null_addr) &&
 110             !is_valid_ether_addr(dev->dev_addr))
 111                 return -EADDRNOTAVAIL;
 112
 113         /* we hold the RTNL here so can safely walk the list */
 114         list_for_each_entry(nsdata, &local->interfaces, list) {
 115                 struct net_device *ndev = nsdata->dev;
 116
 117                 if (ndev != dev && ieee80211_sdata_running(nsdata)) {
 118                         /*
 119                          * Allow only a single IBSS interface to be up at any
 120                          * time. This is restricted because beacon distribution
 121                          * cannot work properly if both are in the same IBSS.
 122                          *
 123                          * To remove this restriction we'd have to disallow them
 124                          * from setting the same SSID on different IBSS interfaces
 125                          * belonging to the same hardware. Then, however, we're
 126                          * faced with having to adopt two different TSF timers...
 127                          */
 128                         if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
 129                             nsdata->vif.type == NL80211_IFTYPE_ADHOC)
 130                                 return -EBUSY;
 131
 132                         /*
 133                          * The remaining checks are only performed for interfaces
 134                          * with the same MAC address.
 135                          */
 136                         if (compare_ether_addr(dev->dev_addr, ndev->dev_addr))
 137                                 continue;
 138
 139                         /*
 140                          * check whether it may have the same address
 141                          */
 142                         if (!identical_mac_addr_allowed(sdata->vif.type,
 143                                                         nsdata->vif.type))
 144                                 return -ENOTUNIQ;
 145
 146                         /*
 147                          * can only add VLANs to enabled APs
 148                          */
 149                         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
 150                             nsdata->vif.type == NL80211_IFTYPE_AP)
 151                                 sdata->bss = &nsdata->u.ap;
 152                 }
 153         }
 154
 155         switch (sdata->vif.type) {
 156         case NL80211_IFTYPE_WDS:
 157                 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
 158                         return -ENOLINK;
 159                 break;
 160         case NL80211_IFTYPE_AP_VLAN:
 161                 if (!sdata->bss)
 162                         return -ENOLINK;
 163                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
 164                 break;
 165         case NL80211_IFTYPE_AP:
 166                 sdata->bss = &sdata->u.ap;
 167                 break;
 168         case NL80211_IFTYPE_MESH_POINT:
 169                 if (!ieee80211_vif_is_mesh(&sdata->vif))
 170                         break;
 171                 /* mesh ifaces must set allmulti to forward mcast traffic */
 172                 atomic_inc(&local->iff_allmultis);
 173                 break;
 174         case NL80211_IFTYPE_STATION:
 175         case NL80211_IFTYPE_MONITOR:
 176         case NL80211_IFTYPE_ADHOC:
 177                 /* no special treatment */
 178                 break;
 179         case NL80211_IFTYPE_UNSPECIFIED:
 180         case __NL80211_IFTYPE_AFTER_LAST:
 181                 /* cannot happen */
 182                 WARN_ON(1);
 183                 break;
 184         }
 185
 186         if (local->open_count == 0) {
 187                 res = drv_start(local);
 188                 if (res)
 189                         goto err_del_bss;
 190                 /* we're brought up, everything changes */
 191                 hw_reconf_flags = ~0;
 192                 ieee80211_led_radio(local, true);
 193         }
 194
 195         /*
 196          * Check all interfaces and copy the hopefully now-present
 197          * MAC address to those that have the special null one.
 198          */
 199         list_for_each_entry(nsdata, &local->interfaces, list) {
 200                 struct net_device *ndev = nsdata->dev;
 201
 202                 /*
 203                  * No need to check running since we do not allow
 204                  * it to start up with this invalid address.
 205                  */
 206                 if (compare_ether_addr(null_addr, ndev->dev_addr) == 0) {
 207                         memcpy(ndev->dev_addr,
 208                                local->hw.wiphy->perm_addr,
 209                                ETH_ALEN);
 210                         memcpy(ndev->perm_addr, ndev->dev_addr, ETH_ALEN);
 211                 }
 212         }
 213
 214         /*
 215          * Validate the MAC address for this device.
 216          */
 217         if (!is_valid_ether_addr(dev->dev_addr)) {
 218                 if (!local->open_count)
 219                         drv_stop(local);
 220                 return -EADDRNOTAVAIL;
 221         }
 222
 223         switch (sdata->vif.type) {
 224         case NL80211_IFTYPE_AP_VLAN:
 225                 /* no need to tell driver */
 226                 break;
 227         case NL80211_IFTYPE_MONITOR:
 228                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 229                         local->cooked_mntrs++;
 230                         break;
 231                 }
 232
 233                 /* must be before the call to ieee80211_configure_filter */
 234                 local->monitors++;
 235                 if (local->monitors == 1) {
 236                         local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
 237                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 238                 }
 239
 240                 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
 241                         local->fif_fcsfail++;
 242                 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
 243                         local->fif_plcpfail++;
 244                 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL) {
 245                         local->fif_control++;
 246                         local->fif_pspoll++;
 247                 }
 248                 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
 249                         local->fif_other_bss++;
 250
 251                 ieee80211_configure_filter(local);
 252                 break;
 253         default:
 254                 res = drv_add_interface(local, &sdata->vif);
 255                 if (res)
 256                         goto err_stop;
 257
 258                 if (ieee80211_vif_is_mesh(&sdata->vif)) {
 259                         local->fif_other_bss++;
 260                         ieee80211_configure_filter(local);
 261
 262                         ieee80211_start_mesh(sdata);
 263                 } else if (sdata->vif.type == NL80211_IFTYPE_AP) {
 264                         local->fif_pspoll++;
 265
 266                         ieee80211_configure_filter(local);
 267                 }
 268
 269                 changed |= ieee80211_reset_erp_info(sdata);
 270                 ieee80211_bss_info_change_notify(sdata, changed);
 271                 ieee80211_enable_keys(sdata);
 272
 273                 if (sdata->vif.type == NL80211_IFTYPE_STATION)
 274                         netif_carrier_off(dev);
 275                 else
 276                         netif_carrier_on(dev);
 277         }
 278
 279         if (sdata->vif.type == NL80211_IFTYPE_WDS) {
 280                 /* Create STA entry for the WDS peer */
 281                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
 282                                      GFP_KERNEL);
 283                 if (!sta) {
 284                         res = -ENOMEM;
 285                         goto err_del_interface;
 286                 }
 287
 288                 /* no locking required since STA is not live yet */
 289                 sta->flags |= WLAN_STA_AUTHORIZED;
 290
 291                 res = sta_info_insert(sta);
 292                 if (res) {
 293                         /* STA has been freed */
 294                         goto err_del_interface;
 295                 }
 296         }
 297
 298         /*
 299          * set_multicast_list will be invoked by the networking core
 300          * which will check whether any increments here were done in
 301          * error and sync them down to the hardware as filter flags.
 302          */
 303         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 304                 atomic_inc(&local->iff_allmultis);
 305
 306         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 307                 atomic_inc(&local->iff_promiscs);
 308
 309         hw_reconf_flags |= __ieee80211_recalc_idle(local);
 310
 311         local->open_count++;
 312         if (hw_reconf_flags) {
 313                 ieee80211_hw_config(local, hw_reconf_flags);
 314                 /*
 315                  * set default queue parameters so drivers don't
 316                  * need to initialise the hardware if the hardware
 317                  * doesn't start up with sane defaults
 318                  */
 319                 ieee80211_set_wmm_default(sdata);
 320         }
 321
 322         ieee80211_recalc_ps(local, -1);
 323
 324         /*
 325          * ieee80211_sta_work is disabled while network interface
 326          * is down. Therefore, some configuration changes may not
 327          * yet be effective. Trigger execution of ieee80211_sta_work
 328          * to fix this.
 329          */
 330         if (sdata->vif.type == NL80211_IFTYPE_STATION)
 331                 ieee80211_queue_work(&local->hw, &sdata->u.mgd.work);
 332
 333         netif_tx_start_all_queues(dev);
 334
 335         return 0;
 336  err_del_interface:
 337         drv_remove_interface(local, &sdata->vif);
 338  err_stop:
 339         if (!local->open_count)
 340                 drv_stop(local);
 341  err_del_bss:
 342         sdata->bss = NULL;
 343         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
 344                 list_del(&sdata->u.vlan.list);
 345         return res;
 346 }
 347
 348 static int ieee80211_stop(struct net_device *dev)
 349 {
 350         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 351         struct ieee80211_local *local = sdata->local;
 352         struct sta_info *sta;
 353         unsigned long flags;
 354         struct sk_buff *skb, *tmp;
 355         u32 hw_reconf_flags = 0;
 356         int i;
 357
 358         /*
 359          * Stop TX on this interface first.
 360          */
 361         netif_tx_stop_all_queues(dev);
 362
 363         /*
 364          * Purge work for this interface.
 365          */
 366         ieee80211_work_purge(sdata);
 367
 368         /*
 369          * Now delete all active aggregation sessions.
 370          */
 371         rcu_read_lock();
 372
 373         list_for_each_entry_rcu(sta, &local->sta_list, list) {
 374                 if (sta->sdata == sdata)
 375                         ieee80211_sta_tear_down_BA_sessions(sta);
 376         }
 377
 378         rcu_read_unlock();
 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         if (sdata->vif.type == NL80211_IFTYPE_AP)
 412                 local->fif_pspoll--;
 413
 414         netif_addr_lock_bh(dev);
 415         spin_lock_bh(&local->filter_lock);
 416         __dev_addr_unsync(&local->mc_list, &local->mc_count,
 417                           &dev->mc_list, &dev->mc_count);
 418         spin_unlock_bh(&local->filter_lock);
 419         netif_addr_unlock_bh(dev);
 420
 421         ieee80211_configure_filter(local);
 422
 423         del_timer_sync(&local->dynamic_ps_timer);
 424         cancel_work_sync(&local->dynamic_ps_enable_work);
 425
 426         /* APs need special treatment */
 427         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 428                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
 429                 struct beacon_data *old_beacon = sdata->u.ap.beacon;
 430
 431                 /* remove beacon */
 432                 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
 433                 synchronize_rcu();
 434                 kfree(old_beacon);
 435
 436                 /* down all dependent devices, that is VLANs */
 437                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
 438                                          u.vlan.list)
 439                         dev_close(vlan->dev);
 440                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
 441         }
 442
 443         local->open_count--;
 444
 445         switch (sdata->vif.type) {
 446         case NL80211_IFTYPE_AP_VLAN:
 447                 list_del(&sdata->u.vlan.list);
 448                 /* no need to tell driver */
 449                 break;
 450         case NL80211_IFTYPE_MONITOR:
 451                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 452                         local->cooked_mntrs--;
 453                         break;
 454                 }
 455
 456                 local->monitors--;
 457                 if (local->monitors == 0) {
 458                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
 459                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 460                 }
 461
 462                 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
 463                         local->fif_fcsfail--;
 464                 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
 465                         local->fif_plcpfail--;
 466                 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL) {
 467                         local->fif_pspoll--;
 468                         local->fif_control--;
 469                 }
 470                 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
 471                         local->fif_other_bss--;
 472
 473                 ieee80211_configure_filter(local);
 474                 break;
 475         case NL80211_IFTYPE_STATION:
 476                 del_timer_sync(&sdata->u.mgd.chswitch_timer);
 477                 del_timer_sync(&sdata->u.mgd.timer);
 478                 del_timer_sync(&sdata->u.mgd.conn_mon_timer);
 479                 del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
 480                 /*
 481                  * If any of the timers fired while we waited for it, it will
 482                  * have queued its work. Now the work will be running again
 483                  * but will not rearm the timer again because it checks
 484                  * whether the interface is running, which, at this point,
 485                  * it no longer is.
 486                  */
 487                 cancel_work_sync(&sdata->u.mgd.work);
 488                 cancel_work_sync(&sdata->u.mgd.chswitch_work);
 489                 cancel_work_sync(&sdata->u.mgd.monitor_work);
 490                 cancel_work_sync(&sdata->u.mgd.beacon_loss_work);
 491
 492                 /*
 493                  * When we get here, the interface is marked down.
 494                  * Call synchronize_rcu() to wait for the RX path
 495                  * should it be using the interface and enqueuing
 496                  * frames at this very time on another CPU.
 497                  */
 498                 synchronize_rcu();
 499                 skb_queue_purge(&sdata->u.mgd.skb_queue);
 500                 /* fall through */
 501         case NL80211_IFTYPE_ADHOC:
 502                 if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 503                         del_timer_sync(&sdata->u.ibss.timer);
 504                         cancel_work_sync(&sdata->u.ibss.work);
 505                         synchronize_rcu();
 506                         skb_queue_purge(&sdata->u.ibss.skb_queue);
 507                 }
 508                 /* fall through */
 509         case NL80211_IFTYPE_MESH_POINT:
 510                 if (ieee80211_vif_is_mesh(&sdata->vif)) {
 511                         /* other_bss and allmulti are always set on mesh
 512                          * ifaces */
 513                         local->fif_other_bss--;
 514                         atomic_dec(&local->iff_allmultis);
 515
 516                         ieee80211_configure_filter(local);
 517
 518                         ieee80211_stop_mesh(sdata);
 519                 }
 520                 /* fall through */
 521         default:
 522                 if (local->scan_sdata == sdata)
 523                         ieee80211_scan_cancel(local);
 524
 525                 /*
 526                  * Disable beaconing for AP and mesh, IBSS can't
 527                  * still be joined to a network at this point.
 528                  */
 529                 if (sdata->vif.type == NL80211_IFTYPE_AP ||
 530                     sdata->vif.type == NL80211_IFTYPE_MESH_POINT) {
 531                         ieee80211_bss_info_change_notify(sdata,
 532                                 BSS_CHANGED_BEACON_ENABLED);
 533                 }
 534
 535                 /* disable all keys for as long as this netdev is down */
 536                 ieee80211_disable_keys(sdata);
 537                 drv_remove_interface(local, &sdata->vif);
 538         }
 539
 540         sdata->bss = NULL;
 541
 542         hw_reconf_flags |= __ieee80211_recalc_idle(local);
 543
 544         ieee80211_recalc_ps(local, -1);
 545
 546         if (local->open_count == 0) {
 547                 ieee80211_clear_tx_pending(local);
 548                 ieee80211_stop_device(local);
 549
 550                 /* no reconfiguring after stop! */
 551                 hw_reconf_flags = 0;
 552         }
 553
 554         /* do after stop to avoid reconfiguring when we stop anyway */
 555         if (hw_reconf_flags)
 556                 ieee80211_hw_config(local, hw_reconf_flags);
 557
 558         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 559         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 560                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
 561                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 562                         if (info->control.vif == &sdata->vif) {
 563                                 __skb_unlink(skb, &local->pending[i]);
 564                                 dev_kfree_skb_irq(skb);
 565                         }
 566                 }
 567         }
 568         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 569
 570         return 0;
 571 }
 572
 573 static void ieee80211_set_multicast_list(struct net_device *dev)
 574 {
 575         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 576         struct ieee80211_local *local = sdata->local;
 577         int allmulti, promisc, sdata_allmulti, sdata_promisc;
 578
 579         allmulti = !!(dev->flags & IFF_ALLMULTI);
 580         promisc = !!(dev->flags & IFF_PROMISC);
 581         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
 582         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
 583
 584         if (allmulti != sdata_allmulti) {
 585                 if (dev->flags & IFF_ALLMULTI)
 586                         atomic_inc(&local->iff_allmultis);
 587                 else
 588                         atomic_dec(&local->iff_allmultis);
 589                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
 590         }
 591
 592         if (promisc != sdata_promisc) {
 593                 if (dev->flags & IFF_PROMISC)
 594                         atomic_inc(&local->iff_promiscs);
 595                 else
 596                         atomic_dec(&local->iff_promiscs);
 597                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
 598         }
 599         spin_lock_bh(&local->filter_lock);
 600         __dev_addr_sync(&local->mc_list, &local->mc_count,
 601                         &dev->mc_list, &dev->mc_count);
 602         spin_unlock_bh(&local->filter_lock);
 603         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
 604 }
 605
 606 /*
 607  * Called when the netdev is removed or, by the code below, before
 608  * the interface type changes.
 609  */
 610 static void ieee80211_teardown_sdata(struct net_device *dev)
 611 {
 612         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 613         struct ieee80211_local *local = sdata->local;
 614         struct beacon_data *beacon;
 615         struct sk_buff *skb;
 616         int flushed;
 617         int i;
 618
 619         /* free extra data */
 620         ieee80211_free_keys(sdata);
 621
 622         ieee80211_debugfs_remove_netdev(sdata);
 623
 624         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
 625                 __skb_queue_purge(&sdata->fragments[i].skb_list);
 626         sdata->fragment_next = 0;
 627
 628         switch (sdata->vif.type) {
 629         case NL80211_IFTYPE_AP:
 630                 beacon = sdata->u.ap.beacon;
 631                 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
 632                 synchronize_rcu();
 633                 kfree(beacon);
 634
 635                 while ((skb = skb_dequeue(&sdata->u.ap.ps_bc_buf))) {
 636                         local->total_ps_buffered--;
 637                         dev_kfree_skb(skb);
 638                 }
 639
 640                 break;
 641         case NL80211_IFTYPE_MESH_POINT:
 642                 if (ieee80211_vif_is_mesh(&sdata->vif))
 643                         mesh_rmc_free(sdata);
 644                 break;
 645         case NL80211_IFTYPE_ADHOC:
 646                 if (WARN_ON(sdata->u.ibss.presp))
 647                         kfree_skb(sdata->u.ibss.presp);
 648                 break;
 649         case NL80211_IFTYPE_STATION:
 650         case NL80211_IFTYPE_WDS:
 651         case NL80211_IFTYPE_AP_VLAN:
 652         case NL80211_IFTYPE_MONITOR:
 653                 break;
 654         case NL80211_IFTYPE_UNSPECIFIED:
 655         case __NL80211_IFTYPE_AFTER_LAST:
 656                 BUG();
 657                 break;
 658         }
 659
 660         flushed = sta_info_flush(local, sdata);
 661         WARN_ON(flushed);
 662 }
 663
 664 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
 665                                          struct sk_buff *skb)
 666 {
 667         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
 668 }
 669
 670 static const struct net_device_ops ieee80211_dataif_ops = {
 671         .ndo_open               = ieee80211_open,
 672         .ndo_stop               = ieee80211_stop,
 673         .ndo_uninit             = ieee80211_teardown_sdata,
 674         .ndo_start_xmit         = ieee80211_subif_start_xmit,
 675         .ndo_set_multicast_list = ieee80211_set_multicast_list,
 676         .ndo_change_mtu         = ieee80211_change_mtu,
 677         .ndo_set_mac_address    = ieee80211_change_mac,
 678         .ndo_select_queue       = ieee80211_netdev_select_queue,
 679 };
 680
 681 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
 682                                           struct sk_buff *skb)
 683 {
 684         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 685         struct ieee80211_local *local = sdata->local;
 686         struct ieee80211_hdr *hdr;
 687         struct ieee80211_radiotap_header *rtap = (void *)skb->data;
 688         u8 *p;
 689
 690         if (local->hw.queues < 4)
 691                 return 0;
 692
 693         if (skb->len < 4 ||
 694             skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
 695                 return 0; /* doesn't matter, frame will be dropped */
 696
 697         hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
 698
 699         if (!ieee80211_is_data(hdr->frame_control)) {
 700                 skb->priority = 7;
 701                 return ieee802_1d_to_ac[skb->priority];
 702         }
 703         if (!ieee80211_is_data_qos(hdr->frame_control)) {
 704                 skb->priority = 0;
 705                 return ieee802_1d_to_ac[skb->priority];
 706         }
 707
 708         p = ieee80211_get_qos_ctl(hdr);
 709         skb->priority = *p & IEEE80211_QOS_CTL_TAG1D_MASK;
 710
 711         return ieee80211_downgrade_queue(local, skb);
 712 }
 713
 714 static const struct net_device_ops ieee80211_monitorif_ops = {
 715         .ndo_open               = ieee80211_open,
 716         .ndo_stop               = ieee80211_stop,
 717         .ndo_uninit             = ieee80211_teardown_sdata,
 718         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
 719         .ndo_set_multicast_list = ieee80211_set_multicast_list,
 720         .ndo_change_mtu         = ieee80211_change_mtu,
 721         .ndo_set_mac_address    = eth_mac_addr,
 722         .ndo_select_queue       = ieee80211_monitor_select_queue,
 723 };
 724
 725 static void ieee80211_if_setup(struct net_device *dev)
 726 {
 727         ether_setup(dev);
 728         dev->netdev_ops = &ieee80211_dataif_ops;
 729         dev->destructor = free_netdev;
 730 }
 731
 732 /*
 733  * Helper function to initialise an interface to a specific type.
 734  */
 735 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
 736                                   enum nl80211_iftype type)
 737 {
 738         /* clear type-dependent union */
 739         memset(&sdata->u, 0, sizeof(sdata->u));
 740
 741         /* and set some type-dependent values */
 742         sdata->vif.type = type;
 743         sdata->dev->netdev_ops = &ieee80211_dataif_ops;
 744         sdata->wdev.iftype = type;
 745
 746         /* only monitor differs */
 747         sdata->dev->type = ARPHRD_ETHER;
 748
 749         switch (type) {
 750         case NL80211_IFTYPE_AP:
 751                 skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
 752                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
 753                 break;
 754         case NL80211_IFTYPE_STATION:
 755                 ieee80211_sta_setup_sdata(sdata);
 756                 break;
 757         case NL80211_IFTYPE_ADHOC:
 758                 ieee80211_ibss_setup_sdata(sdata);
 759                 break;
 760         case NL80211_IFTYPE_MESH_POINT:
 761                 if (ieee80211_vif_is_mesh(&sdata->vif))
 762                         ieee80211_mesh_init_sdata(sdata);
 763                 break;
 764         case NL80211_IFTYPE_MONITOR:
 765                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
 766                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
 767                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
 768                                       MONITOR_FLAG_OTHER_BSS;
 769                 break;
 770         case NL80211_IFTYPE_WDS:
 771         case NL80211_IFTYPE_AP_VLAN:
 772                 break;
 773         case NL80211_IFTYPE_UNSPECIFIED:
 774         case __NL80211_IFTYPE_AFTER_LAST:
 775                 BUG();
 776                 break;
 777         }
 778
 779         ieee80211_debugfs_add_netdev(sdata);
 780 }
 781
 782 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
 783                              enum nl80211_iftype type)
 784 {
 785         ASSERT_RTNL();
 786
 787         if (type == sdata->vif.type)
 788                 return 0;
 789
 790         /* Setting ad-hoc mode on non-IBSS channel is not supported. */
 791         if (sdata->local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS &&
 792             type == NL80211_IFTYPE_ADHOC)
 793                 return -EOPNOTSUPP;
 794
 795         /*
 796          * We could, here, on changes between IBSS/STA/MESH modes,
 797          * invoke an MLME function instead that disassociates etc.
 798          * and goes into the requested mode.
 799          */
 800
 801         if (ieee80211_sdata_running(sdata))
 802                 return -EBUSY;
 803
 804         /* Purge and reset type-dependent state. */
 805         ieee80211_teardown_sdata(sdata->dev);
 806         ieee80211_setup_sdata(sdata, type);
 807
 808         /* reset some values that shouldn't be kept across type changes */
 809         sdata->vif.bss_conf.basic_rates =
 810                 ieee80211_mandatory_rates(sdata->local,
 811                         sdata->local->hw.conf.channel->band);
 812         sdata->drop_unencrypted = 0;
 813         if (type == NL80211_IFTYPE_STATION)
 814                 sdata->u.mgd.use_4addr = false;
 815
 816         return 0;
 817 }
 818
 819 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
 820                      struct net_device **new_dev, enum nl80211_iftype type,
 821                      struct vif_params *params)
 822 {
 823         struct net_device *ndev;
 824         struct ieee80211_sub_if_data *sdata = NULL;
 825         int ret, i;
 826
 827         ASSERT_RTNL();
 828
 829         ndev = alloc_netdev_mq(sizeof(*sdata) + local->hw.vif_data_size,
 830                                name, ieee80211_if_setup, local->hw.queues);
 831         if (!ndev)
 832                 return -ENOMEM;
 833         dev_net_set(ndev, wiphy_net(local->hw.wiphy));
 834
 835         ndev->needed_headroom = local->tx_headroom +
 836                                 4*6 /* four MAC addresses */
 837                                 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
 838                                 + 6 /* mesh */
 839                                 + 8 /* rfc1042/bridge tunnel */
 840                                 - ETH_HLEN /* ethernet hard_header_len */
 841                                 + IEEE80211_ENCRYPT_HEADROOM;
 842         ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
 843
 844         ret = dev_alloc_name(ndev, ndev->name);
 845         if (ret < 0)
 846                 goto fail;
 847
 848         memcpy(ndev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
 849         memcpy(ndev->perm_addr, ndev->dev_addr, ETH_ALEN);
 850         SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
 851
 852         /* don't use IEEE80211_DEV_TO_SUB_IF because it checks too much */
 853         sdata = netdev_priv(ndev);
 854         ndev->ieee80211_ptr = &sdata->wdev;
 855         memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
 856         memcpy(sdata->name, ndev->name, IFNAMSIZ);
 857
 858         /* initialise type-independent data */
 859         sdata->wdev.wiphy = local->hw.wiphy;
 860         sdata->local = local;
 861         sdata->dev = ndev;
 862
 863         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
 864                 skb_queue_head_init(&sdata->fragments[i].skb_list);
 865
 866         INIT_LIST_HEAD(&sdata->key_list);
 867
 868         for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
 869                 struct ieee80211_supported_band *sband;
 870                 sband = local->hw.wiphy->bands[i];
 871                 sdata->rc_rateidx_mask[i] =
 872                         sband ? (1 << sband->n_bitrates) - 1 : 0;
 873         }
 874
 875         /* setup type-dependent data */
 876         ieee80211_setup_sdata(sdata, type);
 877
 878         if (params) {
 879                 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
 880                 if (type == NL80211_IFTYPE_STATION)
 881                         sdata->u.mgd.use_4addr = params->use_4addr;
 882         }
 883
 884         ret = register_netdevice(ndev);
 885         if (ret)
 886                 goto fail;
 887
 888         if (ieee80211_vif_is_mesh(&sdata->vif) &&
 889             params && params->mesh_id_len)
 890                 ieee80211_sdata_set_mesh_id(sdata,
 891                                             params->mesh_id_len,
 892                                             params->mesh_id);
 893
 894         mutex_lock(&local->iflist_mtx);
 895         list_add_tail_rcu(&sdata->list, &local->interfaces);
 896         mutex_unlock(&local->iflist_mtx);
 897
 898         if (new_dev)
 899                 *new_dev = ndev;
 900
 901         return 0;
 902
 903  fail:
 904         free_netdev(ndev);
 905         return ret;
 906 }
 907
 908 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
 909 {
 910         ASSERT_RTNL();
 911
 912         mutex_lock(&sdata->local->iflist_mtx);
 913         list_del_rcu(&sdata->list);
 914         mutex_unlock(&sdata->local->iflist_mtx);
 915
 916         synchronize_rcu();
 917         unregister_netdevice(sdata->dev);
 918 }
 919
 920 /*
 921  * Remove all interfaces, may only be called at hardware unregistration
 922  * time because it doesn't do RCU-safe list removals.
 923  */
 924 void ieee80211_remove_interfaces(struct ieee80211_local *local)
 925 {
 926         struct ieee80211_sub_if_data *sdata, *tmp;
 927         LIST_HEAD(unreg_list);
 928
 929         ASSERT_RTNL();
 930
 931         mutex_lock(&local->iflist_mtx);
 932         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
 933                 list_del(&sdata->list);
 934
 935                 unregister_netdevice_queue(sdata->dev, &unreg_list);
 936         }
 937         mutex_unlock(&local->iflist_mtx);
 938         unregister_netdevice_many(&unreg_list);
 939 }
 940
 941 static u32 ieee80211_idle_off(struct ieee80211_local *local,
 942                               const char *reason)
 943 {
 944         if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
 945                 return 0;
 946
 947 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 948         printk(KERN_DEBUG "%s: device no longer idle - %s\n",
 949                wiphy_name(local->hw.wiphy), reason);
 950 #endif
 951
 952         local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
 953         return IEEE80211_CONF_CHANGE_IDLE;
 954 }
 955
 956 static u32 ieee80211_idle_on(struct ieee80211_local *local)
 957 {
 958         if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
 959                 return 0;
 960
 961 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 962         printk(KERN_DEBUG "%s: device now idle\n",
 963                wiphy_name(local->hw.wiphy));
 964 #endif
 965
 966         drv_flush(local, false);
 967
 968         local->hw.conf.flags |= IEEE80211_CONF_IDLE;
 969         return IEEE80211_CONF_CHANGE_IDLE;
 970 }
 971
 972 u32 __ieee80211_recalc_idle(struct ieee80211_local *local)
 973 {
 974         struct ieee80211_sub_if_data *sdata;
 975         int count = 0;
 976
 977         if (!list_empty(&local->work_list))
 978                 return ieee80211_idle_off(local, "working");
 979
 980         if (local->scanning)
 981                 return ieee80211_idle_off(local, "scanning");
 982
 983         list_for_each_entry(sdata, &local->interfaces, list) {
 984                 if (!ieee80211_sdata_running(sdata))
 985                         continue;
 986                 /* do not count disabled managed interfaces */
 987                 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
 988                     !sdata->u.mgd.associated)
 989                         continue;
 990                 /* do not count unused IBSS interfaces */
 991                 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
 992                     !sdata->u.ibss.ssid_len)
 993                         continue;
 994                 /* count everything else */
 995                 count++;
 996         }
 997
 998         if (!count)
 999                 return ieee80211_idle_on(local);
1000         else
1001                 return ieee80211_idle_off(local, "in use");
1002
1003         return 0;
1004 }
1005
1006 void ieee80211_recalc_idle(struct ieee80211_local *local)
1007 {
1008         u32 chg;
1009
1010         mutex_lock(&local->iflist_mtx);
1011         chg = __ieee80211_recalc_idle(local);
1012         mutex_unlock(&local->iflist_mtx);
1013         if (chg)
1014                 ieee80211_hw_config(local, chg);
1015 }
1016
1017 static int netdev_notify(struct notifier_block *nb,
1018                          unsigned long state,
1019                          void *ndev)
1020 {
1021         struct net_device *dev = ndev;
1022         struct ieee80211_sub_if_data *sdata;
1023
1024         if (state != NETDEV_CHANGENAME)
1025                 return 0;
1026
1027         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1028                 return 0;
1029
1030         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1031                 return 0;
1032
1033         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1034
1035         memcpy(sdata->name, dev->name, IFNAMSIZ);
1036
1037         ieee80211_debugfs_rename_netdev(sdata);
1038         return 0;
1039 }
1040
1041 static struct notifier_block mac80211_netdev_notifier = {
1042         .notifier_call = netdev_notify,
1043 };
1044
1045 int ieee80211_iface_init(void)
1046 {
1047         return register_netdevice_notifier(&mac80211_netdev_notifier);
1048 }
1049
1050 void ieee80211_iface_exit(void)
1051 {
1052         unregister_netdevice_notifier(&mac80211_netdev_notifier);
1053 }