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   1 /*
   2  * Interface handling (except master interface)
   3  *
   4  * Copyright 2002-2005, Instant802 Networks, Inc.
   5  * Copyright 2005-2006, Devicescape Software, Inc.
   6  * Copyright (c) 2006 Jiri Benc <jbenc@suse.cz>
   7  * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13 #include <linux/kernel.h>
  14 #include <linux/if_arp.h>
  15 #include <linux/netdevice.h>
  16 #include <linux/rtnetlink.h>
  17 #include <net/mac80211.h>
  18 #include "ieee80211_i.h"
  19 #include "sta_info.h"
  20 #include "debugfs_netdev.h"
  21 #include "mesh.h"
  22 #include "led.h"
  23 #include "driver-ops.h"
  24
  25 /**
  26  * DOC: Interface list locking
  27  *
  28  * The interface list in each struct ieee80211_local is protected
  29  * three-fold:
  30  *
  31  * (1) modifications may only be done under the RTNL
  32  * (2) modifications and readers are protected against each other by
  33  *     the iflist_mtx.
  34  * (3) modifications are done in an RCU manner so atomic readers
  35  *     can traverse the list in RCU-safe blocks.
  36  *
  37  * As a consequence, reads (traversals) of the list can be protected
  38  * by either the RTNL, the iflist_mtx or RCU.
  39  */
  40
  41
  42 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
  43 {
  44         int meshhdrlen;
  45         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
  46
  47         meshhdrlen = (sdata->vif.type == NL80211_IFTYPE_MESH_POINT) ? 5 : 0;
  48
  49         /* FIX: what would be proper limits for MTU?
  50          * This interface uses 802.3 frames. */
  51         if (new_mtu < 256 ||
  52             new_mtu > IEEE80211_MAX_DATA_LEN - 24 - 6 - meshhdrlen) {
  53                 return -EINVAL;
  54         }
  55
  56 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
  57         printk(KERN_DEBUG "%s: setting MTU %d\n", dev->name, new_mtu);
  58 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
  59         dev->mtu = new_mtu;
  60         return 0;
  61 }
  62
  63 static 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         struct sockaddr *sa = addr;
  67         int ret;
  68
  69         if (ieee80211_sdata_running(sdata))
  70                 return -EBUSY;
  71
  72         ret = eth_mac_addr(dev, sa);
  73
  74         if (ret == 0)
  75                 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
  76
  77         return ret;
  78 }
  79
  80 static inline int identical_mac_addr_allowed(int type1, int type2)
  81 {
  82         return type1 == NL80211_IFTYPE_MONITOR ||
  83                 type2 == NL80211_IFTYPE_MONITOR ||
  84                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
  85                 (type1 == NL80211_IFTYPE_WDS &&
  86                         (type2 == NL80211_IFTYPE_WDS ||
  87                          type2 == NL80211_IFTYPE_AP)) ||
  88                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
  89                 (type1 == NL80211_IFTYPE_AP_VLAN &&
  90                         (type2 == NL80211_IFTYPE_AP ||
  91                          type2 == NL80211_IFTYPE_AP_VLAN));
  92 }
  93
  94 static int ieee80211_open(struct net_device *dev)
  95 {
  96         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
  97         struct ieee80211_sub_if_data *nsdata;
  98         struct ieee80211_local *local = sdata->local;
  99         struct sta_info *sta;
 100         u32 changed = 0;
 101         int res;
 102         u32 hw_reconf_flags = 0;
 103         u8 null_addr[ETH_ALEN] = {0};
 104
 105         /* fail early if user set an invalid address */
 106         if (compare_ether_addr(dev->dev_addr, null_addr) &&
 107             !is_valid_ether_addr(dev->dev_addr))
 108                 return -EADDRNOTAVAIL;
 109
 110         /* we hold the RTNL here so can safely walk the list */
 111         list_for_each_entry(nsdata, &local->interfaces, list) {
 112                 struct net_device *ndev = nsdata->dev;
 113
 114                 if (ndev != dev && ieee80211_sdata_running(nsdata)) {
 115                         /*
 116                          * Allow only a single IBSS interface to be up at any
 117                          * time. This is restricted because beacon distribution
 118                          * cannot work properly if both are in the same IBSS.
 119                          *
 120                          * To remove this restriction we'd have to disallow them
 121                          * from setting the same SSID on different IBSS interfaces
 122                          * belonging to the same hardware. Then, however, we're
 123                          * faced with having to adopt two different TSF timers...
 124                          */
 125                         if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
 126                             nsdata->vif.type == NL80211_IFTYPE_ADHOC)
 127                                 return -EBUSY;
 128
 129                         /*
 130                          * The remaining checks are only performed for interfaces
 131                          * with the same MAC address.
 132                          */
 133                         if (compare_ether_addr(dev->dev_addr, ndev->dev_addr))
 134                                 continue;
 135
 136                         /*
 137                          * check whether it may have the same address
 138                          */
 139                         if (!identical_mac_addr_allowed(sdata->vif.type,
 140                                                         nsdata->vif.type))
 141                                 return -ENOTUNIQ;
 142
 143                         /*
 144                          * can only add VLANs to enabled APs
 145                          */
 146                         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
 147                             nsdata->vif.type == NL80211_IFTYPE_AP)
 148                                 sdata->bss = &nsdata->u.ap;
 149                 }
 150         }
 151
 152         switch (sdata->vif.type) {
 153         case NL80211_IFTYPE_WDS:
 154                 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
 155                         return -ENOLINK;
 156                 break;
 157         case NL80211_IFTYPE_AP_VLAN:
 158                 if (!sdata->bss)
 159                         return -ENOLINK;
 160                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
 161                 break;
 162         case NL80211_IFTYPE_AP:
 163                 sdata->bss = &sdata->u.ap;
 164                 break;
 165         case NL80211_IFTYPE_MESH_POINT:
 166                 if (!ieee80211_vif_is_mesh(&sdata->vif))
 167                         break;
 168                 /* mesh ifaces must set allmulti to forward mcast traffic */
 169                 atomic_inc(&local->iff_allmultis);
 170                 break;
 171         case NL80211_IFTYPE_STATION:
 172         case NL80211_IFTYPE_MONITOR:
 173         case NL80211_IFTYPE_ADHOC:
 174                 /* no special treatment */
 175                 break;
 176         case NL80211_IFTYPE_UNSPECIFIED:
 177         case __NL80211_IFTYPE_AFTER_LAST:
 178                 /* cannot happen */
 179                 WARN_ON(1);
 180                 break;
 181         }
 182
 183         if (local->open_count == 0) {
 184                 res = drv_start(local);
 185                 if (res)
 186                         goto err_del_bss;
 187                 /* we're brought up, everything changes */
 188                 hw_reconf_flags = ~0;
 189                 ieee80211_led_radio(local, true);
 190         }
 191
 192         /*
 193          * Check all interfaces and copy the hopefully now-present
 194          * MAC address to those that have the special null one.
 195          */
 196         list_for_each_entry(nsdata, &local->interfaces, list) {
 197                 struct net_device *ndev = nsdata->dev;
 198
 199                 /*
 200                  * No need to check running since we do not allow
 201                  * it to start up with this invalid address.
 202                  */
 203                 if (compare_ether_addr(null_addr, ndev->dev_addr) == 0) {
 204                         memcpy(ndev->dev_addr,
 205                                local->hw.wiphy->perm_addr,
 206                                ETH_ALEN);
 207                         memcpy(ndev->perm_addr, ndev->dev_addr, ETH_ALEN);
 208                 }
 209         }
 210
 211         /*
 212          * Validate the MAC address for this device.
 213          */
 214         if (!is_valid_ether_addr(dev->dev_addr)) {
 215                 if (!local->open_count)
 216                         drv_stop(local);
 217                 return -EADDRNOTAVAIL;
 218         }
 219
 220         switch (sdata->vif.type) {
 221         case NL80211_IFTYPE_AP_VLAN:
 222                 /* no need to tell driver */
 223                 break;
 224         case NL80211_IFTYPE_MONITOR:
 225                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 226                         local->cooked_mntrs++;
 227                         break;
 228                 }
 229
 230                 /* must be before the call to ieee80211_configure_filter */
 231                 local->monitors++;
 232                 if (local->monitors == 1) {
 233                         local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
 234                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 235                 }
 236
 237                 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
 238                         local->fif_fcsfail++;
 239                 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
 240                         local->fif_plcpfail++;
 241                 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL) {
 242                         local->fif_control++;
 243                         local->fif_pspoll++;
 244                 }
 245                 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
 246                         local->fif_other_bss++;
 247
 248                 ieee80211_configure_filter(local);
 249                 break;
 250         default:
 251                 res = drv_add_interface(local, &sdata->vif);
 252                 if (res)
 253                         goto err_stop;
 254
 255                 if (ieee80211_vif_is_mesh(&sdata->vif)) {
 256                         local->fif_other_bss++;
 257                         ieee80211_configure_filter(local);
 258
 259                         ieee80211_start_mesh(sdata);
 260                 } else if (sdata->vif.type == NL80211_IFTYPE_AP) {
 261                         local->fif_pspoll++;
 262
 263                         ieee80211_configure_filter(local);
 264                 }
 265
 266                 changed |= ieee80211_reset_erp_info(sdata);
 267                 ieee80211_bss_info_change_notify(sdata, changed);
 268                 ieee80211_enable_keys(sdata);
 269
 270                 if (sdata->vif.type == NL80211_IFTYPE_STATION)
 271                         netif_carrier_off(dev);
 272                 else
 273                         netif_carrier_on(dev);
 274         }
 275
 276         if (sdata->vif.type == NL80211_IFTYPE_WDS) {
 277                 /* Create STA entry for the WDS peer */
 278                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
 279                                      GFP_KERNEL);
 280                 if (!sta) {
 281                         res = -ENOMEM;
 282                         goto err_del_interface;
 283                 }
 284
 285                 /* no locking required since STA is not live yet */
 286                 sta->flags |= WLAN_STA_AUTHORIZED;
 287
 288                 res = sta_info_insert(sta);
 289                 if (res) {
 290                         /* STA has been freed */
 291                         goto err_del_interface;
 292                 }
 293         }
 294
 295         /*
 296          * set_multicast_list will be invoked by the networking core
 297          * which will check whether any increments here were done in
 298          * error and sync them down to the hardware as filter flags.
 299          */
 300         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 301                 atomic_inc(&local->iff_allmultis);
 302
 303         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 304                 atomic_inc(&local->iff_promiscs);
 305
 306         hw_reconf_flags |= __ieee80211_recalc_idle(local);
 307
 308         local->open_count++;
 309         if (hw_reconf_flags) {
 310                 ieee80211_hw_config(local, hw_reconf_flags);
 311                 /*
 312                  * set default queue parameters so drivers don't
 313                  * need to initialise the hardware if the hardware
 314                  * doesn't start up with sane defaults
 315                  */
 316                 ieee80211_set_wmm_default(sdata);
 317         }
 318
 319         ieee80211_recalc_ps(local, -1);
 320
 321         /*
 322          * ieee80211_sta_work is disabled while network interface
 323          * is down. Therefore, some configuration changes may not
 324          * yet be effective. Trigger execution of ieee80211_sta_work
 325          * to fix this.
 326          */
 327         if (sdata->vif.type == NL80211_IFTYPE_STATION)
 328                 ieee80211_queue_work(&local->hw, &sdata->u.mgd.work);
 329
 330         netif_start_queue(dev);
 331
 332         return 0;
 333  err_del_interface:
 334         drv_remove_interface(local, &sdata->vif);
 335  err_stop:
 336         if (!local->open_count)
 337                 drv_stop(local);
 338  err_del_bss:
 339         sdata->bss = NULL;
 340         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
 341                 list_del(&sdata->u.vlan.list);
 342         return res;
 343 }
 344
 345 static int ieee80211_stop(struct net_device *dev)
 346 {
 347         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 348         struct ieee80211_local *local = sdata->local;
 349         struct sta_info *sta;
 350         unsigned long flags;
 351         struct sk_buff *skb, *tmp;
 352         u32 hw_reconf_flags = 0;
 353         int i;
 354
 355         /*
 356          * Stop TX on this interface first.
 357          */
 358         netif_stop_queue(dev);
 359
 360         /*
 361          * Purge work for this interface.
 362          */
 363         ieee80211_work_purge(sdata);
 364
 365         /*
 366          * Now delete all active aggregation sessions.
 367          */
 368         rcu_read_lock();
 369
 370         list_for_each_entry_rcu(sta, &local->sta_list, list) {
 371                 if (sta->sdata == sdata)
 372                         ieee80211_sta_tear_down_BA_sessions(sta);
 373         }
 374
 375         rcu_read_unlock();
 376
 377         /*
 378          * Remove all stations associated with this interface.
 379          *
 380          * This must be done before calling ops->remove_interface()
 381          * because otherwise we can later invoke ops->sta_notify()
 382          * whenever the STAs are removed, and that invalidates driver
 383          * assumptions about always getting a vif pointer that is valid
 384          * (because if we remove a STA after ops->remove_interface()
 385          * the driver will have removed the vif info already!)
 386          *
 387          * We could relax this and only unlink the stations from the
 388          * hash table and list but keep them on a per-sdata list that
 389          * will be inserted back again when the interface is brought
 390          * up again, but I don't currently see a use case for that,
 391          * except with WDS which gets a STA entry created when it is
 392          * brought up.
 393          */
 394         sta_info_flush(local, sdata);
 395
 396         /*
 397          * Don't count this interface for promisc/allmulti while it
 398          * is down. dev_mc_unsync() will invoke set_multicast_list
 399          * on the master interface which will sync these down to the
 400          * hardware as filter flags.
 401          */
 402         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 403                 atomic_dec(&local->iff_allmultis);
 404
 405         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 406                 atomic_dec(&local->iff_promiscs);
 407
 408         if (sdata->vif.type == NL80211_IFTYPE_AP)
 409                 local->fif_pspoll--;
 410
 411         netif_addr_lock_bh(dev);
 412         spin_lock_bh(&local->filter_lock);
 413         __dev_addr_unsync(&local->mc_list, &local->mc_count,
 414                           &dev->mc_list, &dev->mc_count);
 415         spin_unlock_bh(&local->filter_lock);
 416         netif_addr_unlock_bh(dev);
 417
 418         ieee80211_configure_filter(local);
 419
 420         del_timer_sync(&local->dynamic_ps_timer);
 421         cancel_work_sync(&local->dynamic_ps_enable_work);
 422
 423         /* APs need special treatment */
 424         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 425                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
 426                 struct beacon_data *old_beacon = sdata->u.ap.beacon;
 427
 428                 /* remove beacon */
 429                 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
 430                 synchronize_rcu();
 431                 kfree(old_beacon);
 432
 433                 /* down all dependent devices, that is VLANs */
 434                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
 435                                          u.vlan.list)
 436                         dev_close(vlan->dev);
 437                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
 438         }
 439
 440         local->open_count--;
 441
 442         switch (sdata->vif.type) {
 443         case NL80211_IFTYPE_AP_VLAN:
 444                 list_del(&sdata->u.vlan.list);
 445                 /* no need to tell driver */
 446                 break;
 447         case NL80211_IFTYPE_MONITOR:
 448                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 449                         local->cooked_mntrs--;
 450                         break;
 451                 }
 452
 453                 local->monitors--;
 454                 if (local->monitors == 0) {
 455                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
 456                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 457                 }
 458
 459                 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
 460                         local->fif_fcsfail--;
 461                 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
 462                         local->fif_plcpfail--;
 463                 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL) {
 464                         local->fif_pspoll--;
 465                         local->fif_control--;
 466                 }
 467                 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
 468                         local->fif_other_bss--;
 469
 470                 ieee80211_configure_filter(local);
 471                 break;
 472         case NL80211_IFTYPE_STATION:
 473                 del_timer_sync(&sdata->u.mgd.chswitch_timer);
 474                 del_timer_sync(&sdata->u.mgd.timer);
 475                 del_timer_sync(&sdata->u.mgd.conn_mon_timer);
 476                 del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
 477                 /*
 478                  * If any of the timers fired while we waited for it, it will
 479                  * have queued its work. Now the work will be running again
 480                  * but will not rearm the timer again because it checks
 481                  * whether the interface is running, which, at this point,
 482                  * it no longer is.
 483                  */
 484                 cancel_work_sync(&sdata->u.mgd.work);
 485                 cancel_work_sync(&sdata->u.mgd.chswitch_work);
 486                 cancel_work_sync(&sdata->u.mgd.monitor_work);
 487                 cancel_work_sync(&sdata->u.mgd.beacon_loss_work);
 488
 489                 /*
 490                  * When we get here, the interface is marked down.
 491                  * Call synchronize_rcu() to wait for the RX path
 492                  * should it be using the interface and enqueuing
 493                  * frames at this very time on another CPU.
 494                  */
 495                 synchronize_rcu();
 496                 skb_queue_purge(&sdata->u.mgd.skb_queue);
 497                 /* fall through */
 498         case NL80211_IFTYPE_ADHOC:
 499                 if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 500                         del_timer_sync(&sdata->u.ibss.timer);
 501                         cancel_work_sync(&sdata->u.ibss.work);
 502                         synchronize_rcu();
 503                         skb_queue_purge(&sdata->u.ibss.skb_queue);
 504                 }
 505                 /* fall through */
 506         case NL80211_IFTYPE_MESH_POINT:
 507                 if (ieee80211_vif_is_mesh(&sdata->vif)) {
 508                         /* other_bss and allmulti are always set on mesh
 509                          * ifaces */
 510                         local->fif_other_bss--;
 511                         atomic_dec(&local->iff_allmultis);
 512
 513                         ieee80211_configure_filter(local);
 514
 515                         ieee80211_stop_mesh(sdata);
 516                 }
 517                 /* fall through */
 518         default:
 519                 if (local->scan_sdata == sdata)
 520                         ieee80211_scan_cancel(local);
 521
 522                 /*
 523                  * Disable beaconing for AP and mesh, IBSS can't
 524                  * still be joined to a network at this point.
 525                  */
 526                 if (sdata->vif.type == NL80211_IFTYPE_AP ||
 527                     sdata->vif.type == NL80211_IFTYPE_MESH_POINT) {
 528                         ieee80211_bss_info_change_notify(sdata,
 529                                 BSS_CHANGED_BEACON_ENABLED);
 530                 }
 531
 532                 /* disable all keys for as long as this netdev is down */
 533                 ieee80211_disable_keys(sdata);
 534                 drv_remove_interface(local, &sdata->vif);
 535         }
 536
 537         sdata->bss = NULL;
 538
 539         hw_reconf_flags |= __ieee80211_recalc_idle(local);
 540
 541         ieee80211_recalc_ps(local, -1);
 542
 543         if (local->open_count == 0) {
 544                 ieee80211_clear_tx_pending(local);
 545                 ieee80211_stop_device(local);
 546
 547                 /* no reconfiguring after stop! */
 548                 hw_reconf_flags = 0;
 549         }
 550
 551         /* do after stop to avoid reconfiguring when we stop anyway */
 552         if (hw_reconf_flags)
 553                 ieee80211_hw_config(local, hw_reconf_flags);
 554
 555         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 556         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 557                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
 558                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 559                         if (info->control.vif == &sdata->vif) {
 560                                 __skb_unlink(skb, &local->pending[i]);
 561                                 dev_kfree_skb_irq(skb);
 562                         }
 563                 }
 564         }
 565         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 566
 567         return 0;
 568 }
 569
 570 static void ieee80211_set_multicast_list(struct net_device *dev)
 571 {
 572         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 573         struct ieee80211_local *local = sdata->local;
 574         int allmulti, promisc, sdata_allmulti, sdata_promisc;
 575
 576         allmulti = !!(dev->flags & IFF_ALLMULTI);
 577         promisc = !!(dev->flags & IFF_PROMISC);
 578         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
 579         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
 580
 581         if (allmulti != sdata_allmulti) {
 582                 if (dev->flags & IFF_ALLMULTI)
 583                         atomic_inc(&local->iff_allmultis);
 584                 else
 585                         atomic_dec(&local->iff_allmultis);
 586                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
 587         }
 588
 589         if (promisc != sdata_promisc) {
 590                 if (dev->flags & IFF_PROMISC)
 591                         atomic_inc(&local->iff_promiscs);
 592                 else
 593                         atomic_dec(&local->iff_promiscs);
 594                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
 595         }
 596         spin_lock_bh(&local->filter_lock);
 597         __dev_addr_sync(&local->mc_list, &local->mc_count,
 598                         &dev->mc_list, &dev->mc_count);
 599         spin_unlock_bh(&local->filter_lock);
 600         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
 601 }
 602
 603 /*
 604  * Called when the netdev is removed or, by the code below, before
 605  * the interface type changes.
 606  */
 607 static void ieee80211_teardown_sdata(struct net_device *dev)
 608 {
 609         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 610         struct ieee80211_local *local = sdata->local;
 611         struct beacon_data *beacon;
 612         struct sk_buff *skb;
 613         int flushed;
 614         int i;
 615
 616         /* free extra data */
 617         ieee80211_free_keys(sdata);
 618
 619         ieee80211_debugfs_remove_netdev(sdata);
 620
 621         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
 622                 __skb_queue_purge(&sdata->fragments[i].skb_list);
 623         sdata->fragment_next = 0;
 624
 625         switch (sdata->vif.type) {
 626         case NL80211_IFTYPE_AP:
 627                 beacon = sdata->u.ap.beacon;
 628                 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
 629                 synchronize_rcu();
 630                 kfree(beacon);
 631
 632                 while ((skb = skb_dequeue(&sdata->u.ap.ps_bc_buf))) {
 633                         local->total_ps_buffered--;
 634                         dev_kfree_skb(skb);
 635                 }
 636
 637                 break;
 638         case NL80211_IFTYPE_MESH_POINT:
 639                 if (ieee80211_vif_is_mesh(&sdata->vif))
 640                         mesh_rmc_free(sdata);
 641                 break;
 642         case NL80211_IFTYPE_ADHOC:
 643                 if (WARN_ON(sdata->u.ibss.presp))
 644                         kfree_skb(sdata->u.ibss.presp);
 645                 break;
 646         case NL80211_IFTYPE_STATION:
 647         case NL80211_IFTYPE_WDS:
 648         case NL80211_IFTYPE_AP_VLAN:
 649         case NL80211_IFTYPE_MONITOR:
 650                 break;
 651         case NL80211_IFTYPE_UNSPECIFIED:
 652         case __NL80211_IFTYPE_AFTER_LAST:
 653                 BUG();
 654                 break;
 655         }
 656
 657         flushed = sta_info_flush(local, sdata);
 658         WARN_ON(flushed);
 659 }
 660
 661 static const struct net_device_ops ieee80211_dataif_ops = {
 662         .ndo_open               = ieee80211_open,
 663         .ndo_stop               = ieee80211_stop,
 664         .ndo_uninit             = ieee80211_teardown_sdata,
 665         .ndo_start_xmit         = ieee80211_subif_start_xmit,
 666         .ndo_set_multicast_list = ieee80211_set_multicast_list,
 667         .ndo_change_mtu         = ieee80211_change_mtu,
 668         .ndo_set_mac_address    = ieee80211_change_mac,
 669 };
 670
 671 static const struct net_device_ops ieee80211_monitorif_ops = {
 672         .ndo_open               = ieee80211_open,
 673         .ndo_stop               = ieee80211_stop,
 674         .ndo_uninit             = ieee80211_teardown_sdata,
 675         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
 676         .ndo_set_multicast_list = ieee80211_set_multicast_list,
 677         .ndo_change_mtu         = ieee80211_change_mtu,
 678         .ndo_set_mac_address    = eth_mac_addr,
 679 };
 680
 681 static void ieee80211_if_setup(struct net_device *dev)
 682 {
 683         ether_setup(dev);
 684         dev->netdev_ops = &ieee80211_dataif_ops;
 685         dev->destructor = free_netdev;
 686 }
 687
 688 /*
 689  * Helper function to initialise an interface to a specific type.
 690  */
 691 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
 692                                   enum nl80211_iftype type)
 693 {
 694         /* clear type-dependent union */
 695         memset(&sdata->u, 0, sizeof(sdata->u));
 696
 697         /* and set some type-dependent values */
 698         sdata->vif.type = type;
 699         sdata->dev->netdev_ops = &ieee80211_dataif_ops;
 700         sdata->wdev.iftype = type;
 701
 702         /* only monitor differs */
 703         sdata->dev->type = ARPHRD_ETHER;
 704
 705         switch (type) {
 706         case NL80211_IFTYPE_AP:
 707                 skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
 708                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
 709                 break;
 710         case NL80211_IFTYPE_STATION:
 711                 ieee80211_sta_setup_sdata(sdata);
 712                 break;
 713         case NL80211_IFTYPE_ADHOC:
 714                 ieee80211_ibss_setup_sdata(sdata);
 715                 break;
 716         case NL80211_IFTYPE_MESH_POINT:
 717                 if (ieee80211_vif_is_mesh(&sdata->vif))
 718                         ieee80211_mesh_init_sdata(sdata);
 719                 break;
 720         case NL80211_IFTYPE_MONITOR:
 721                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
 722                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
 723                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
 724                                       MONITOR_FLAG_OTHER_BSS;
 725                 break;
 726         case NL80211_IFTYPE_WDS:
 727         case NL80211_IFTYPE_AP_VLAN:
 728                 break;
 729         case NL80211_IFTYPE_UNSPECIFIED:
 730         case __NL80211_IFTYPE_AFTER_LAST:
 731                 BUG();
 732                 break;
 733         }
 734
 735         ieee80211_debugfs_add_netdev(sdata);
 736 }
 737
 738 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
 739                              enum nl80211_iftype type)
 740 {
 741         ASSERT_RTNL();
 742
 743         if (type == sdata->vif.type)
 744                 return 0;
 745
 746         /* Setting ad-hoc mode on non-IBSS channel is not supported. */
 747         if (sdata->local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS &&
 748             type == NL80211_IFTYPE_ADHOC)
 749                 return -EOPNOTSUPP;
 750
 751         /*
 752          * We could, here, on changes between IBSS/STA/MESH modes,
 753          * invoke an MLME function instead that disassociates etc.
 754          * and goes into the requested mode.
 755          */
 756
 757         if (ieee80211_sdata_running(sdata))
 758                 return -EBUSY;
 759
 760         /* Purge and reset type-dependent state. */
 761         ieee80211_teardown_sdata(sdata->dev);
 762         ieee80211_setup_sdata(sdata, type);
 763
 764         /* reset some values that shouldn't be kept across type changes */
 765         sdata->vif.bss_conf.basic_rates =
 766                 ieee80211_mandatory_rates(sdata->local,
 767                         sdata->local->hw.conf.channel->band);
 768         sdata->drop_unencrypted = 0;
 769         if (type == NL80211_IFTYPE_STATION)
 770                 sdata->u.mgd.use_4addr = false;
 771
 772         return 0;
 773 }
 774
 775 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
 776                      struct net_device **new_dev, enum nl80211_iftype type,
 777                      struct vif_params *params)
 778 {
 779         struct net_device *ndev;
 780         struct ieee80211_sub_if_data *sdata = NULL;
 781         int ret, i;
 782
 783         ASSERT_RTNL();
 784
 785         ndev = alloc_netdev(sizeof(*sdata) + local->hw.vif_data_size,
 786                             name, ieee80211_if_setup);
 787         if (!ndev)
 788                 return -ENOMEM;
 789         dev_net_set(ndev, wiphy_net(local->hw.wiphy));
 790
 791         ndev->needed_headroom = local->tx_headroom +
 792                                 4*6 /* four MAC addresses */
 793                                 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
 794                                 + 6 /* mesh */
 795                                 + 8 /* rfc1042/bridge tunnel */
 796                                 - ETH_HLEN /* ethernet hard_header_len */
 797                                 + IEEE80211_ENCRYPT_HEADROOM;
 798         ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
 799
 800         ret = dev_alloc_name(ndev, ndev->name);
 801         if (ret < 0)
 802                 goto fail;
 803
 804         memcpy(ndev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
 805         memcpy(ndev->perm_addr, ndev->dev_addr, ETH_ALEN);
 806         SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
 807
 808         /* don't use IEEE80211_DEV_TO_SUB_IF because it checks too much */
 809         sdata = netdev_priv(ndev);
 810         ndev->ieee80211_ptr = &sdata->wdev;
 811         memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
 812         memcpy(sdata->name, ndev->name, IFNAMSIZ);
 813
 814         /* initialise type-independent data */
 815         sdata->wdev.wiphy = local->hw.wiphy;
 816         sdata->local = local;
 817         sdata->dev = ndev;
 818
 819         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
 820                 skb_queue_head_init(&sdata->fragments[i].skb_list);
 821
 822         INIT_LIST_HEAD(&sdata->key_list);
 823
 824         sdata->force_unicast_rateidx = -1;
 825         sdata->max_ratectrl_rateidx = -1;
 826
 827         /* setup type-dependent data */
 828         ieee80211_setup_sdata(sdata, type);
 829
 830         if (params) {
 831                 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
 832                 if (type == NL80211_IFTYPE_STATION)
 833                         sdata->u.mgd.use_4addr = params->use_4addr;
 834         }
 835
 836         ret = register_netdevice(ndev);
 837         if (ret)
 838                 goto fail;
 839
 840         if (ieee80211_vif_is_mesh(&sdata->vif) &&
 841             params && params->mesh_id_len)
 842                 ieee80211_sdata_set_mesh_id(sdata,
 843                                             params->mesh_id_len,
 844                                             params->mesh_id);
 845
 846         mutex_lock(&local->iflist_mtx);
 847         list_add_tail_rcu(&sdata->list, &local->interfaces);
 848         mutex_unlock(&local->iflist_mtx);
 849
 850         if (new_dev)
 851                 *new_dev = ndev;
 852
 853         return 0;
 854
 855  fail:
 856         free_netdev(ndev);
 857         return ret;
 858 }
 859
 860 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
 861 {
 862         ASSERT_RTNL();
 863
 864         mutex_lock(&sdata->local->iflist_mtx);
 865         list_del_rcu(&sdata->list);
 866         mutex_unlock(&sdata->local->iflist_mtx);
 867
 868         synchronize_rcu();
 869         unregister_netdevice(sdata->dev);
 870 }
 871
 872 /*
 873  * Remove all interfaces, may only be called at hardware unregistration
 874  * time because it doesn't do RCU-safe list removals.
 875  */
 876 void ieee80211_remove_interfaces(struct ieee80211_local *local)
 877 {
 878         struct ieee80211_sub_if_data *sdata, *tmp;
 879         LIST_HEAD(unreg_list);
 880
 881         ASSERT_RTNL();
 882
 883         mutex_lock(&local->iflist_mtx);
 884         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
 885                 list_del(&sdata->list);
 886
 887                 unregister_netdevice_queue(sdata->dev, &unreg_list);
 888         }
 889         mutex_unlock(&local->iflist_mtx);
 890         unregister_netdevice_many(&unreg_list);
 891 }
 892
 893 static u32 ieee80211_idle_off(struct ieee80211_local *local,
 894                               const char *reason)
 895 {
 896         if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
 897                 return 0;
 898
 899 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 900         printk(KERN_DEBUG "%s: device no longer idle - %s\n",
 901                wiphy_name(local->hw.wiphy), reason);
 902 #endif
 903
 904         local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
 905         return IEEE80211_CONF_CHANGE_IDLE;
 906 }
 907
 908 static u32 ieee80211_idle_on(struct ieee80211_local *local)
 909 {
 910         if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
 911                 return 0;
 912
 913 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 914         printk(KERN_DEBUG "%s: device now idle\n",
 915                wiphy_name(local->hw.wiphy));
 916 #endif
 917
 918         drv_flush(local, false);
 919
 920         local->hw.conf.flags |= IEEE80211_CONF_IDLE;
 921         return IEEE80211_CONF_CHANGE_IDLE;
 922 }
 923
 924 u32 __ieee80211_recalc_idle(struct ieee80211_local *local)
 925 {
 926         struct ieee80211_sub_if_data *sdata;
 927         int count = 0;
 928
 929         if (!list_empty(&local->work_list))
 930                 return ieee80211_idle_off(local, "working");
 931
 932         if (local->scanning)
 933                 return ieee80211_idle_off(local, "scanning");
 934
 935         list_for_each_entry(sdata, &local->interfaces, list) {
 936                 if (!ieee80211_sdata_running(sdata))
 937                         continue;
 938                 /* do not count disabled managed interfaces */
 939                 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
 940                     !sdata->u.mgd.associated)
 941                         continue;
 942                 /* do not count unused IBSS interfaces */
 943                 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
 944                     !sdata->u.ibss.ssid_len)
 945                         continue;
 946                 /* count everything else */
 947                 count++;
 948         }
 949
 950         if (!count)
 951                 return ieee80211_idle_on(local);
 952         else
 953                 return ieee80211_idle_off(local, "in use");
 954
 955         return 0;
 956 }
 957
 958 void ieee80211_recalc_idle(struct ieee80211_local *local)
 959 {
 960         u32 chg;
 961
 962         mutex_lock(&local->iflist_mtx);
 963         chg = __ieee80211_recalc_idle(local);
 964         mutex_unlock(&local->iflist_mtx);
 965         if (chg)
 966                 ieee80211_hw_config(local, chg);
 967 }
 968
 969 static int netdev_notify(struct notifier_block *nb,
 970                          unsigned long state,
 971                          void *ndev)
 972 {
 973         struct net_device *dev = ndev;
 974         struct ieee80211_sub_if_data *sdata;
 975
 976         if (state != NETDEV_CHANGENAME)
 977                 return 0;
 978
 979         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
 980                 return 0;
 981
 982         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
 983                 return 0;
 984
 985         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 986
 987         memcpy(sdata->name, sdata->name, IFNAMSIZ);
 988
 989         ieee80211_debugfs_rename_netdev(sdata);
 990         return 0;
 991 }
 992
 993 static struct notifier_block mac80211_netdev_notifier = {
 994         .notifier_call = netdev_notify,
 995 };
 996
 997 int ieee80211_iface_init(void)
 998 {
 999         return register_netdevice_notifier(&mac80211_netdev_notifier);
1000 }
1001
1002 void ieee80211_iface_exit(void)
1003 {
1004         unregister_netdevice_notifier(&mac80211_netdev_notifier);
1005 }