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 int ieee80211_change_mac(struct net_device *dev, void *addr)
  64 {
  65         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
  66         int ret;
  67
  68         if (ieee80211_sdata_running(sdata))
  69                 return -EBUSY;
  70
  71         ret = eth_mac_addr(dev, addr);
  72
  73         if (ret == 0)
  74                 memcpy(sdata->vif.addr, addr, ETH_ALEN);
  75
  76         return ret;
  77 }
  78
  79 static inline int identical_mac_addr_allowed(int type1, int type2)
  80 {
  81         return type1 == NL80211_IFTYPE_MONITOR ||
  82                 type2 == NL80211_IFTYPE_MONITOR ||
  83                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
  84                 (type1 == NL80211_IFTYPE_WDS &&
  85                         (type2 == NL80211_IFTYPE_WDS ||
  86                          type2 == NL80211_IFTYPE_AP)) ||
  87                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
  88                 (type1 == NL80211_IFTYPE_AP_VLAN &&
  89                         (type2 == NL80211_IFTYPE_AP ||
  90                          type2 == NL80211_IFTYPE_AP_VLAN));
  91 }
  92
  93 static int ieee80211_open(struct net_device *dev)
  94 {
  95         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
  96         struct ieee80211_sub_if_data *nsdata;
  97         struct ieee80211_local *local = sdata->local;
  98         struct sta_info *sta;
  99         u32 changed = 0;
 100         int res;
 101         u32 hw_reconf_flags = 0;
 102         u8 null_addr[ETH_ALEN] = {0};
 103
 104         /* fail early if user set an invalid address */
 105         if (compare_ether_addr(dev->dev_addr, null_addr) &&
 106             !is_valid_ether_addr(dev->dev_addr))
 107                 return -EADDRNOTAVAIL;
 108
 109         /* we hold the RTNL here so can safely walk the list */
 110         list_for_each_entry(nsdata, &local->interfaces, list) {
 111                 struct net_device *ndev = nsdata->dev;
 112
 113                 if (ndev != dev && ieee80211_sdata_running(nsdata)) {
 114                         /*
 115                          * Allow only a single IBSS interface to be up at any
 116                          * time. This is restricted because beacon distribution
 117                          * cannot work properly if both are in the same IBSS.
 118                          *
 119                          * To remove this restriction we'd have to disallow them
 120                          * from setting the same SSID on different IBSS interfaces
 121                          * belonging to the same hardware. Then, however, we're
 122                          * faced with having to adopt two different TSF timers...
 123                          */
 124                         if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
 125                             nsdata->vif.type == NL80211_IFTYPE_ADHOC)
 126                                 return -EBUSY;
 127
 128                         /*
 129                          * The remaining checks are only performed for interfaces
 130                          * with the same MAC address.
 131                          */
 132                         if (compare_ether_addr(dev->dev_addr, ndev->dev_addr))
 133                                 continue;
 134
 135                         /*
 136                          * check whether it may have the same address
 137                          */
 138                         if (!identical_mac_addr_allowed(sdata->vif.type,
 139                                                         nsdata->vif.type))
 140                                 return -ENOTUNIQ;
 141
 142                         /*
 143                          * can only add VLANs to enabled APs
 144                          */
 145                         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
 146                             nsdata->vif.type == NL80211_IFTYPE_AP)
 147                                 sdata->bss = &nsdata->u.ap;
 148                 }
 149         }
 150
 151         switch (sdata->vif.type) {
 152         case NL80211_IFTYPE_WDS:
 153                 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
 154                         return -ENOLINK;
 155                 break;
 156         case NL80211_IFTYPE_AP_VLAN:
 157                 if (!sdata->bss)
 158                         return -ENOLINK;
 159                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
 160                 break;
 161         case NL80211_IFTYPE_AP:
 162                 sdata->bss = &sdata->u.ap;
 163                 break;
 164         case NL80211_IFTYPE_MESH_POINT:
 165                 if (!ieee80211_vif_is_mesh(&sdata->vif))
 166                         break;
 167                 /* mesh ifaces must set allmulti to forward mcast traffic */
 168                 atomic_inc(&local->iff_allmultis);
 169                 break;
 170         case NL80211_IFTYPE_STATION:
 171         case NL80211_IFTYPE_MONITOR:
 172         case NL80211_IFTYPE_ADHOC:
 173                 /* no special treatment */
 174                 break;
 175         case NL80211_IFTYPE_UNSPECIFIED:
 176         case __NL80211_IFTYPE_AFTER_LAST:
 177                 /* cannot happen */
 178                 WARN_ON(1);
 179                 break;
 180         }
 181
 182         if (local->open_count == 0) {
 183                 res = drv_start(local);
 184                 if (res)
 185                         goto err_del_bss;
 186                 /* we're brought up, everything changes */
 187                 hw_reconf_flags = ~0;
 188                 ieee80211_led_radio(local, true);
 189         }
 190
 191         /*
 192          * Check all interfaces and copy the hopefully now-present
 193          * MAC address to those that have the special null one.
 194          */
 195         list_for_each_entry(nsdata, &local->interfaces, list) {
 196                 struct net_device *ndev = nsdata->dev;
 197
 198                 /*
 199                  * No need to check running since we do not allow
 200                  * it to start up with this invalid address.
 201                  */
 202                 if (compare_ether_addr(null_addr, ndev->dev_addr) == 0) {
 203                         memcpy(ndev->dev_addr,
 204                                local->hw.wiphy->perm_addr,
 205                                ETH_ALEN);
 206                         memcpy(ndev->perm_addr, ndev->dev_addr, ETH_ALEN);
 207                 }
 208         }
 209
 210         /*
 211          * Validate the MAC address for this device.
 212          */
 213         if (!is_valid_ether_addr(dev->dev_addr)) {
 214                 if (!local->open_count)
 215                         drv_stop(local);
 216                 return -EADDRNOTAVAIL;
 217         }
 218
 219         switch (sdata->vif.type) {
 220         case NL80211_IFTYPE_AP_VLAN:
 221                 /* no need to tell driver */
 222                 break;
 223         case NL80211_IFTYPE_MONITOR:
 224                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 225                         local->cooked_mntrs++;
 226                         break;
 227                 }
 228
 229                 /* must be before the call to ieee80211_configure_filter */
 230                 local->monitors++;
 231                 if (local->monitors == 1) {
 232                         local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
 233                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 234                 }
 235
 236                 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
 237                         local->fif_fcsfail++;
 238                 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
 239                         local->fif_plcpfail++;
 240                 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL) {
 241                         local->fif_control++;
 242                         local->fif_pspoll++;
 243                 }
 244                 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
 245                         local->fif_other_bss++;
 246
 247                 ieee80211_configure_filter(local);
 248                 break;
 249         default:
 250                 res = drv_add_interface(local, &sdata->vif);
 251                 if (res)
 252                         goto err_stop;
 253
 254                 if (ieee80211_vif_is_mesh(&sdata->vif)) {
 255                         local->fif_other_bss++;
 256                         ieee80211_configure_filter(local);
 257
 258                         ieee80211_start_mesh(sdata);
 259                 } else if (sdata->vif.type == NL80211_IFTYPE_AP) {
 260                         local->fif_pspoll++;
 261
 262                         ieee80211_configure_filter(local);
 263                 }
 264
 265                 changed |= ieee80211_reset_erp_info(sdata);
 266                 ieee80211_bss_info_change_notify(sdata, changed);
 267                 ieee80211_enable_keys(sdata);
 268
 269                 if (sdata->vif.type == NL80211_IFTYPE_STATION)
 270                         netif_carrier_off(dev);
 271                 else
 272                         netif_carrier_on(dev);
 273         }
 274
 275         if (sdata->vif.type == NL80211_IFTYPE_WDS) {
 276                 /* Create STA entry for the WDS peer */
 277                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
 278                                      GFP_KERNEL);
 279                 if (!sta) {
 280                         res = -ENOMEM;
 281                         goto err_del_interface;
 282                 }
 283
 284                 /* no locking required since STA is not live yet */
 285                 sta->flags |= WLAN_STA_AUTHORIZED;
 286
 287                 res = sta_info_insert(sta);
 288                 if (res) {
 289                         /* STA has been freed */
 290                         goto err_del_interface;
 291                 }
 292         }
 293
 294         /*
 295          * set_multicast_list will be invoked by the networking core
 296          * which will check whether any increments here were done in
 297          * error and sync them down to the hardware as filter flags.
 298          */
 299         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 300                 atomic_inc(&local->iff_allmultis);
 301
 302         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 303                 atomic_inc(&local->iff_promiscs);
 304
 305         hw_reconf_flags |= __ieee80211_recalc_idle(local);
 306
 307         local->open_count++;
 308         if (hw_reconf_flags) {
 309                 ieee80211_hw_config(local, hw_reconf_flags);
 310                 /*
 311                  * set default queue parameters so drivers don't
 312                  * need to initialise the hardware if the hardware
 313                  * doesn't start up with sane defaults
 314                  */
 315                 ieee80211_set_wmm_default(sdata);
 316         }
 317
 318         ieee80211_recalc_ps(local, -1);
 319
 320         /*
 321          * ieee80211_sta_work is disabled while network interface
 322          * is down. Therefore, some configuration changes may not
 323          * yet be effective. Trigger execution of ieee80211_sta_work
 324          * to fix this.
 325          */
 326         if (sdata->vif.type == NL80211_IFTYPE_STATION)
 327                 ieee80211_queue_work(&local->hw, &sdata->u.mgd.work);
 328
 329         netif_start_queue(dev);
 330
 331         return 0;
 332  err_del_interface:
 333         drv_remove_interface(local, &sdata->vif);
 334  err_stop:
 335         if (!local->open_count)
 336                 drv_stop(local);
 337  err_del_bss:
 338         sdata->bss = NULL;
 339         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
 340                 list_del(&sdata->u.vlan.list);
 341         return res;
 342 }
 343
 344 static int ieee80211_stop(struct net_device *dev)
 345 {
 346         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 347         struct ieee80211_local *local = sdata->local;
 348         struct sta_info *sta;
 349         unsigned long flags;
 350         struct sk_buff *skb, *tmp;
 351         u32 hw_reconf_flags = 0;
 352         int i;
 353
 354         /*
 355          * Stop TX on this interface first.
 356          */
 357         netif_stop_queue(dev);
 358
 359         /*
 360          * Purge work for this interface.
 361          */
 362         ieee80211_work_purge(sdata);
 363
 364         /*
 365          * Now delete all active aggregation sessions.
 366          */
 367         rcu_read_lock();
 368
 369         list_for_each_entry_rcu(sta, &local->sta_list, list) {
 370                 if (sta->sdata == sdata)
 371                         ieee80211_sta_tear_down_BA_sessions(sta);
 372         }
 373
 374         rcu_read_unlock();
 375
 376         /*
 377          * Remove all stations associated with this interface.
 378          *
 379          * This must be done before calling ops->remove_interface()
 380          * because otherwise we can later invoke ops->sta_notify()
 381          * whenever the STAs are removed, and that invalidates driver
 382          * assumptions about always getting a vif pointer that is valid
 383          * (because if we remove a STA after ops->remove_interface()
 384          * the driver will have removed the vif info already!)
 385          *
 386          * We could relax this and only unlink the stations from the
 387          * hash table and list but keep them on a per-sdata list that
 388          * will be inserted back again when the interface is brought
 389          * up again, but I don't currently see a use case for that,
 390          * except with WDS which gets a STA entry created when it is
 391          * brought up.
 392          */
 393         sta_info_flush(local, sdata);
 394
 395         /*
 396          * Don't count this interface for promisc/allmulti while it
 397          * is down. dev_mc_unsync() will invoke set_multicast_list
 398          * on the master interface which will sync these down to the
 399          * hardware as filter flags.
 400          */
 401         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 402                 atomic_dec(&local->iff_allmultis);
 403
 404         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 405                 atomic_dec(&local->iff_promiscs);
 406
 407         if (sdata->vif.type == NL80211_IFTYPE_AP)
 408                 local->fif_pspoll--;
 409
 410         netif_addr_lock_bh(dev);
 411         spin_lock_bh(&local->filter_lock);
 412         __dev_addr_unsync(&local->mc_list, &local->mc_count,
 413                           &dev->mc_list, &dev->mc_count);
 414         spin_unlock_bh(&local->filter_lock);
 415         netif_addr_unlock_bh(dev);
 416
 417         ieee80211_configure_filter(local);
 418
 419         del_timer_sync(&local->dynamic_ps_timer);
 420         cancel_work_sync(&local->dynamic_ps_enable_work);
 421
 422         /* APs need special treatment */
 423         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 424                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
 425                 struct beacon_data *old_beacon = sdata->u.ap.beacon;
 426
 427                 /* remove beacon */
 428                 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
 429                 synchronize_rcu();
 430                 kfree(old_beacon);
 431
 432                 /* down all dependent devices, that is VLANs */
 433                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
 434                                          u.vlan.list)
 435                         dev_close(vlan->dev);
 436                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
 437         }
 438
 439         local->open_count--;
 440
 441         switch (sdata->vif.type) {
 442         case NL80211_IFTYPE_AP_VLAN:
 443                 list_del(&sdata->u.vlan.list);
 444                 /* no need to tell driver */
 445                 break;
 446         case NL80211_IFTYPE_MONITOR:
 447                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 448                         local->cooked_mntrs--;
 449                         break;
 450                 }
 451
 452                 local->monitors--;
 453                 if (local->monitors == 0) {
 454                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
 455                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 456                 }
 457
 458                 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
 459                         local->fif_fcsfail--;
 460                 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
 461                         local->fif_plcpfail--;
 462                 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL) {
 463                         local->fif_pspoll--;
 464                         local->fif_control--;
 465                 }
 466                 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
 467                         local->fif_other_bss--;
 468
 469                 ieee80211_configure_filter(local);
 470                 break;
 471         case NL80211_IFTYPE_STATION:
 472                 del_timer_sync(&sdata->u.mgd.chswitch_timer);
 473                 del_timer_sync(&sdata->u.mgd.timer);
 474                 del_timer_sync(&sdata->u.mgd.conn_mon_timer);
 475                 del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
 476                 /*
 477                  * If any of the timers fired while we waited for it, it will
 478                  * have queued its work. Now the work will be running again
 479                  * but will not rearm the timer again because it checks
 480                  * whether the interface is running, which, at this point,
 481                  * it no longer is.
 482                  */
 483                 cancel_work_sync(&sdata->u.mgd.work);
 484                 cancel_work_sync(&sdata->u.mgd.chswitch_work);
 485                 cancel_work_sync(&sdata->u.mgd.monitor_work);
 486                 cancel_work_sync(&sdata->u.mgd.beacon_loss_work);
 487
 488                 /*
 489                  * When we get here, the interface is marked down.
 490                  * Call synchronize_rcu() to wait for the RX path
 491                  * should it be using the interface and enqueuing
 492                  * frames at this very time on another CPU.
 493                  */
 494                 synchronize_rcu();
 495                 skb_queue_purge(&sdata->u.mgd.skb_queue);
 496                 /* fall through */
 497         case NL80211_IFTYPE_ADHOC:
 498                 if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 499                         del_timer_sync(&sdata->u.ibss.timer);
 500                         cancel_work_sync(&sdata->u.ibss.work);
 501                         synchronize_rcu();
 502                         skb_queue_purge(&sdata->u.ibss.skb_queue);
 503                 }
 504                 /* fall through */
 505         case NL80211_IFTYPE_MESH_POINT:
 506                 if (ieee80211_vif_is_mesh(&sdata->vif)) {
 507                         /* other_bss and allmulti are always set on mesh
 508                          * ifaces */
 509                         local->fif_other_bss--;
 510                         atomic_dec(&local->iff_allmultis);
 511
 512                         ieee80211_configure_filter(local);
 513
 514                         ieee80211_stop_mesh(sdata);
 515                 }
 516                 /* fall through */
 517         default:
 518                 if (local->scan_sdata == sdata)
 519                         ieee80211_scan_cancel(local);
 520
 521                 /*
 522                  * Disable beaconing for AP and mesh, IBSS can't
 523                  * still be joined to a network at this point.
 524                  */
 525                 if (sdata->vif.type == NL80211_IFTYPE_AP ||
 526                     sdata->vif.type == NL80211_IFTYPE_MESH_POINT) {
 527                         ieee80211_bss_info_change_notify(sdata,
 528                                 BSS_CHANGED_BEACON_ENABLED);
 529                 }
 530
 531                 /* disable all keys for as long as this netdev is down */
 532                 ieee80211_disable_keys(sdata);
 533                 drv_remove_interface(local, &sdata->vif);
 534         }
 535
 536         sdata->bss = NULL;
 537
 538         hw_reconf_flags |= __ieee80211_recalc_idle(local);
 539
 540         ieee80211_recalc_ps(local, -1);
 541
 542         if (local->open_count == 0) {
 543                 ieee80211_clear_tx_pending(local);
 544                 ieee80211_stop_device(local);
 545
 546                 /* no reconfiguring after stop! */
 547                 hw_reconf_flags = 0;
 548         }
 549
 550         /* do after stop to avoid reconfiguring when we stop anyway */
 551         if (hw_reconf_flags)
 552                 ieee80211_hw_config(local, hw_reconf_flags);
 553
 554         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 555         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 556                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
 557                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 558                         if (info->control.vif == &sdata->vif) {
 559                                 __skb_unlink(skb, &local->pending[i]);
 560                                 dev_kfree_skb_irq(skb);
 561                         }
 562                 }
 563         }
 564         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 565
 566         return 0;
 567 }
 568
 569 static void ieee80211_set_multicast_list(struct net_device *dev)
 570 {
 571         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 572         struct ieee80211_local *local = sdata->local;
 573         int allmulti, promisc, sdata_allmulti, sdata_promisc;
 574
 575         allmulti = !!(dev->flags & IFF_ALLMULTI);
 576         promisc = !!(dev->flags & IFF_PROMISC);
 577         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
 578         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
 579
 580         if (allmulti != sdata_allmulti) {
 581                 if (dev->flags & IFF_ALLMULTI)
 582                         atomic_inc(&local->iff_allmultis);
 583                 else
 584                         atomic_dec(&local->iff_allmultis);
 585                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
 586         }
 587
 588         if (promisc != sdata_promisc) {
 589                 if (dev->flags & IFF_PROMISC)
 590                         atomic_inc(&local->iff_promiscs);
 591                 else
 592                         atomic_dec(&local->iff_promiscs);
 593                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
 594         }
 595         spin_lock_bh(&local->filter_lock);
 596         __dev_addr_sync(&local->mc_list, &local->mc_count,
 597                         &dev->mc_list, &dev->mc_count);
 598         spin_unlock_bh(&local->filter_lock);
 599         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
 600 }
 601
 602 /*
 603  * Called when the netdev is removed or, by the code below, before
 604  * the interface type changes.
 605  */
 606 static void ieee80211_teardown_sdata(struct net_device *dev)
 607 {
 608         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 609         struct ieee80211_local *local = sdata->local;
 610         struct beacon_data *beacon;
 611         struct sk_buff *skb;
 612         int flushed;
 613         int i;
 614
 615         /* free extra data */
 616         ieee80211_free_keys(sdata);
 617
 618         ieee80211_debugfs_remove_netdev(sdata);
 619
 620         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
 621                 __skb_queue_purge(&sdata->fragments[i].skb_list);
 622         sdata->fragment_next = 0;
 623
 624         switch (sdata->vif.type) {
 625         case NL80211_IFTYPE_AP:
 626                 beacon = sdata->u.ap.beacon;
 627                 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
 628                 synchronize_rcu();
 629                 kfree(beacon);
 630
 631                 while ((skb = skb_dequeue(&sdata->u.ap.ps_bc_buf))) {
 632                         local->total_ps_buffered--;
 633                         dev_kfree_skb(skb);
 634                 }
 635
 636                 break;
 637         case NL80211_IFTYPE_MESH_POINT:
 638                 if (ieee80211_vif_is_mesh(&sdata->vif))
 639                         mesh_rmc_free(sdata);
 640                 break;
 641         case NL80211_IFTYPE_ADHOC:
 642                 if (WARN_ON(sdata->u.ibss.presp))
 643                         kfree_skb(sdata->u.ibss.presp);
 644                 break;
 645         case NL80211_IFTYPE_STATION:
 646         case NL80211_IFTYPE_WDS:
 647         case NL80211_IFTYPE_AP_VLAN:
 648         case NL80211_IFTYPE_MONITOR:
 649                 break;
 650         case NL80211_IFTYPE_UNSPECIFIED:
 651         case __NL80211_IFTYPE_AFTER_LAST:
 652                 BUG();
 653                 break;
 654         }
 655
 656         flushed = sta_info_flush(local, sdata);
 657         WARN_ON(flushed);
 658 }
 659
 660 static const struct net_device_ops ieee80211_dataif_ops = {
 661         .ndo_open               = ieee80211_open,
 662         .ndo_stop               = ieee80211_stop,
 663         .ndo_uninit             = ieee80211_teardown_sdata,
 664         .ndo_start_xmit         = ieee80211_subif_start_xmit,
 665         .ndo_set_multicast_list = ieee80211_set_multicast_list,
 666         .ndo_change_mtu         = ieee80211_change_mtu,
 667         .ndo_set_mac_address    = ieee80211_change_mac,
 668 };
 669
 670 static const struct net_device_ops ieee80211_monitorif_ops = {
 671         .ndo_open               = ieee80211_open,
 672         .ndo_stop               = ieee80211_stop,
 673         .ndo_uninit             = ieee80211_teardown_sdata,
 674         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
 675         .ndo_set_multicast_list = ieee80211_set_multicast_list,
 676         .ndo_change_mtu         = ieee80211_change_mtu,
 677         .ndo_set_mac_address    = eth_mac_addr,
 678 };
 679
 680 static void ieee80211_if_setup(struct net_device *dev)
 681 {
 682         ether_setup(dev);
 683         dev->netdev_ops = &ieee80211_dataif_ops;
 684         dev->destructor = free_netdev;
 685 }
 686
 687 /*
 688  * Helper function to initialise an interface to a specific type.
 689  */
 690 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
 691                                   enum nl80211_iftype type)
 692 {
 693         /* clear type-dependent union */
 694         memset(&sdata->u, 0, sizeof(sdata->u));
 695
 696         /* and set some type-dependent values */
 697         sdata->vif.type = type;
 698         sdata->dev->netdev_ops = &ieee80211_dataif_ops;
 699         sdata->wdev.iftype = type;
 700
 701         /* only monitor differs */
 702         sdata->dev->type = ARPHRD_ETHER;
 703
 704         switch (type) {
 705         case NL80211_IFTYPE_AP:
 706                 skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
 707                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
 708                 break;
 709         case NL80211_IFTYPE_STATION:
 710                 ieee80211_sta_setup_sdata(sdata);
 711                 break;
 712         case NL80211_IFTYPE_ADHOC:
 713                 ieee80211_ibss_setup_sdata(sdata);
 714                 break;
 715         case NL80211_IFTYPE_MESH_POINT:
 716                 if (ieee80211_vif_is_mesh(&sdata->vif))
 717                         ieee80211_mesh_init_sdata(sdata);
 718                 break;
 719         case NL80211_IFTYPE_MONITOR:
 720                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
 721                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
 722                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
 723                                       MONITOR_FLAG_OTHER_BSS;
 724                 break;
 725         case NL80211_IFTYPE_WDS:
 726         case NL80211_IFTYPE_AP_VLAN:
 727                 break;
 728         case NL80211_IFTYPE_UNSPECIFIED:
 729         case __NL80211_IFTYPE_AFTER_LAST:
 730                 BUG();
 731                 break;
 732         }
 733
 734         ieee80211_debugfs_add_netdev(sdata);
 735 }
 736
 737 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
 738                              enum nl80211_iftype type)
 739 {
 740         ASSERT_RTNL();
 741
 742         if (type == sdata->vif.type)
 743                 return 0;
 744
 745         /* Setting ad-hoc mode on non-IBSS channel is not supported. */
 746         if (sdata->local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS &&
 747             type == NL80211_IFTYPE_ADHOC)
 748                 return -EOPNOTSUPP;
 749
 750         /*
 751          * We could, here, on changes between IBSS/STA/MESH modes,
 752          * invoke an MLME function instead that disassociates etc.
 753          * and goes into the requested mode.
 754          */
 755
 756         if (ieee80211_sdata_running(sdata))
 757                 return -EBUSY;
 758
 759         /* Purge and reset type-dependent state. */
 760         ieee80211_teardown_sdata(sdata->dev);
 761         ieee80211_setup_sdata(sdata, type);
 762
 763         /* reset some values that shouldn't be kept across type changes */
 764         sdata->vif.bss_conf.basic_rates =
 765                 ieee80211_mandatory_rates(sdata->local,
 766                         sdata->local->hw.conf.channel->band);
 767         sdata->drop_unencrypted = 0;
 768         if (type == NL80211_IFTYPE_STATION)
 769                 sdata->u.mgd.use_4addr = false;
 770
 771         return 0;
 772 }
 773
 774 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
 775                      struct net_device **new_dev, enum nl80211_iftype type,
 776                      struct vif_params *params)
 777 {
 778         struct net_device *ndev;
 779         struct ieee80211_sub_if_data *sdata = NULL;
 780         int ret, i;
 781
 782         ASSERT_RTNL();
 783
 784         ndev = alloc_netdev(sizeof(*sdata) + local->hw.vif_data_size,
 785                             name, ieee80211_if_setup);
 786         if (!ndev)
 787                 return -ENOMEM;
 788         dev_net_set(ndev, wiphy_net(local->hw.wiphy));
 789
 790         ndev->needed_headroom = local->tx_headroom +
 791                                 4*6 /* four MAC addresses */
 792                                 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
 793                                 + 6 /* mesh */
 794                                 + 8 /* rfc1042/bridge tunnel */
 795                                 - ETH_HLEN /* ethernet hard_header_len */
 796                                 + IEEE80211_ENCRYPT_HEADROOM;
 797         ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
 798
 799         ret = dev_alloc_name(ndev, ndev->name);
 800         if (ret < 0)
 801                 goto fail;
 802
 803         memcpy(ndev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
 804         memcpy(ndev->perm_addr, ndev->dev_addr, ETH_ALEN);
 805         SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
 806
 807         /* don't use IEEE80211_DEV_TO_SUB_IF because it checks too much */
 808         sdata = netdev_priv(ndev);
 809         ndev->ieee80211_ptr = &sdata->wdev;
 810         memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
 811         memcpy(sdata->name, ndev->name, IFNAMSIZ);
 812
 813         /* initialise type-independent data */
 814         sdata->wdev.wiphy = local->hw.wiphy;
 815         sdata->local = local;
 816         sdata->dev = ndev;
 817
 818         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
 819                 skb_queue_head_init(&sdata->fragments[i].skb_list);
 820
 821         INIT_LIST_HEAD(&sdata->key_list);
 822
 823         sdata->force_unicast_rateidx = -1;
 824         sdata->max_ratectrl_rateidx = -1;
 825
 826         /* setup type-dependent data */
 827         ieee80211_setup_sdata(sdata, type);
 828
 829         if (params) {
 830                 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
 831                 if (type == NL80211_IFTYPE_STATION)
 832                         sdata->u.mgd.use_4addr = params->use_4addr;
 833         }
 834
 835         ret = register_netdevice(ndev);
 836         if (ret)
 837                 goto fail;
 838
 839         if (ieee80211_vif_is_mesh(&sdata->vif) &&
 840             params && params->mesh_id_len)
 841                 ieee80211_sdata_set_mesh_id(sdata,
 842                                             params->mesh_id_len,
 843                                             params->mesh_id);
 844
 845         mutex_lock(&local->iflist_mtx);
 846         list_add_tail_rcu(&sdata->list, &local->interfaces);
 847         mutex_unlock(&local->iflist_mtx);
 848
 849         if (new_dev)
 850                 *new_dev = ndev;
 851
 852         return 0;
 853
 854  fail:
 855         free_netdev(ndev);
 856         return ret;
 857 }
 858
 859 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
 860 {
 861         ASSERT_RTNL();
 862
 863         mutex_lock(&sdata->local->iflist_mtx);
 864         list_del_rcu(&sdata->list);
 865         mutex_unlock(&sdata->local->iflist_mtx);
 866
 867         synchronize_rcu();
 868         unregister_netdevice(sdata->dev);
 869 }
 870
 871 /*
 872  * Remove all interfaces, may only be called at hardware unregistration
 873  * time because it doesn't do RCU-safe list removals.
 874  */
 875 void ieee80211_remove_interfaces(struct ieee80211_local *local)
 876 {
 877         struct ieee80211_sub_if_data *sdata, *tmp;
 878         LIST_HEAD(unreg_list);
 879
 880         ASSERT_RTNL();
 881
 882         mutex_lock(&local->iflist_mtx);
 883         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
 884                 list_del(&sdata->list);
 885
 886                 unregister_netdevice_queue(sdata->dev, &unreg_list);
 887         }
 888         mutex_unlock(&local->iflist_mtx);
 889         unregister_netdevice_many(&unreg_list);
 890 }
 891
 892 static u32 ieee80211_idle_off(struct ieee80211_local *local,
 893                               const char *reason)
 894 {
 895         if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
 896                 return 0;
 897
 898 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 899         printk(KERN_DEBUG "%s: device no longer idle - %s\n",
 900                wiphy_name(local->hw.wiphy), reason);
 901 #endif
 902
 903         local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
 904         return IEEE80211_CONF_CHANGE_IDLE;
 905 }
 906
 907 static u32 ieee80211_idle_on(struct ieee80211_local *local)
 908 {
 909         if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
 910                 return 0;
 911
 912 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 913         printk(KERN_DEBUG "%s: device now idle\n",
 914                wiphy_name(local->hw.wiphy));
 915 #endif
 916
 917         drv_flush(local, false);
 918
 919         local->hw.conf.flags |= IEEE80211_CONF_IDLE;
 920         return IEEE80211_CONF_CHANGE_IDLE;
 921 }
 922
 923 u32 __ieee80211_recalc_idle(struct ieee80211_local *local)
 924 {
 925         struct ieee80211_sub_if_data *sdata;
 926         int count = 0;
 927
 928         if (!list_empty(&local->work_list))
 929                 return ieee80211_idle_off(local, "working");
 930
 931         if (local->scanning)
 932                 return ieee80211_idle_off(local, "scanning");
 933
 934         list_for_each_entry(sdata, &local->interfaces, list) {
 935                 if (!ieee80211_sdata_running(sdata))
 936                         continue;
 937                 /* do not count disabled managed interfaces */
 938                 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
 939                     !sdata->u.mgd.associated)
 940                         continue;
 941                 /* do not count unused IBSS interfaces */
 942                 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
 943                     !sdata->u.ibss.ssid_len)
 944                         continue;
 945                 /* count everything else */
 946                 count++;
 947         }
 948
 949         if (!count)
 950                 return ieee80211_idle_on(local);
 951         else
 952                 return ieee80211_idle_off(local, "in use");
 953
 954         return 0;
 955 }
 956
 957 void ieee80211_recalc_idle(struct ieee80211_local *local)
 958 {
 959         u32 chg;
 960
 961         mutex_lock(&local->iflist_mtx);
 962         chg = __ieee80211_recalc_idle(local);
 963         mutex_unlock(&local->iflist_mtx);
 964         if (chg)
 965                 ieee80211_hw_config(local, chg);
 966 }
 967
 968 static int netdev_notify(struct notifier_block *nb,
 969                          unsigned long state,
 970                          void *ndev)
 971 {
 972         struct net_device *dev = ndev;
 973         struct ieee80211_sub_if_data *sdata;
 974
 975         if (state != NETDEV_CHANGENAME)
 976                 return 0;
 977
 978         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
 979                 return 0;
 980
 981         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
 982                 return 0;
 983
 984         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 985
 986         memcpy(sdata->name, sdata->name, IFNAMSIZ);
 987
 988         ieee80211_debugfs_rename_netdev(sdata);
 989         return 0;
 990 }
 991
 992 static struct notifier_block mac80211_netdev_notifier = {
 993         .notifier_call = netdev_notify,
 994 };
 995
 996 int ieee80211_iface_init(void)
 997 {
 998         return register_netdevice_notifier(&mac80211_netdev_notifier);
 999 }
1000
1001 void ieee80211_iface_exit(void)
1002 {
1003         unregister_netdevice_notifier(&mac80211_netdev_notifier);
1004 }