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 <net/ieee80211_radiotap.h>
  19 #include "ieee80211_i.h"
  20 #include "sta_info.h"
  21 #include "debugfs_netdev.h"
  22 #include "mesh.h"
  23 #include "led.h"
  24 #include "driver-ops.h"
  25 #include "wme.h"
  26
  27 /**
  28  * DOC: Interface list locking
  29  *
  30  * The interface list in each struct ieee80211_local is protected
  31  * three-fold:
  32  *
  33  * (1) modifications may only be done under the RTNL
  34  * (2) modifications and readers are protected against each other by
  35  *     the iflist_mtx.
  36  * (3) modifications are done in an RCU manner so atomic readers
  37  *     can traverse the list in RCU-safe blocks.
  38  *
  39  * As a consequence, reads (traversals) of the list can be protected
  40  * by either the RTNL, the iflist_mtx or RCU.
  41  */
  42
  43
  44 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
  45 {
  46         int meshhdrlen;
  47         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
  48
  49         meshhdrlen = (sdata->vif.type == NL80211_IFTYPE_MESH_POINT) ? 5 : 0;
  50
  51         /* FIX: what would be proper limits for MTU?
  52          * This interface uses 802.3 frames. */
  53         if (new_mtu < 256 ||
  54             new_mtu > IEEE80211_MAX_DATA_LEN - 24 - 6 - meshhdrlen) {
  55                 return -EINVAL;
  56         }
  57
  58 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
  59         printk(KERN_DEBUG "%s: setting MTU %d\n", dev->name, new_mtu);
  60 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
  61         dev->mtu = new_mtu;
  62         return 0;
  63 }
  64
  65 static int ieee80211_change_mac(struct net_device *dev, void *addr)
  66 {
  67         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
  68         struct sockaddr *sa = addr;
  69         int ret;
  70
  71         if (ieee80211_sdata_running(sdata))
  72                 return -EBUSY;
  73
  74         ret = eth_mac_addr(dev, sa);
  75
  76         if (ret == 0)
  77                 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
  78
  79         return ret;
  80 }
  81
  82 static inline int identical_mac_addr_allowed(int type1, int type2)
  83 {
  84         return type1 == NL80211_IFTYPE_MONITOR ||
  85                 type2 == NL80211_IFTYPE_MONITOR ||
  86                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
  87                 (type1 == NL80211_IFTYPE_WDS &&
  88                         (type2 == NL80211_IFTYPE_WDS ||
  89                          type2 == NL80211_IFTYPE_AP)) ||
  90                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
  91                 (type1 == NL80211_IFTYPE_AP_VLAN &&
  92                         (type2 == NL80211_IFTYPE_AP ||
  93                          type2 == NL80211_IFTYPE_AP_VLAN));
  94 }
  95
  96 static int ieee80211_open(struct net_device *dev)
  97 {
  98         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
  99         struct ieee80211_sub_if_data *nsdata;
 100         struct ieee80211_local *local = sdata->local;
 101         struct sta_info *sta;
 102         u32 changed = 0;
 103         int res;
 104         u32 hw_reconf_flags = 0;
 105         u8 null_addr[ETH_ALEN] = {0};
 106
 107         /* fail early if user set an invalid address */
 108         if (compare_ether_addr(dev->dev_addr, null_addr) &&
 109             !is_valid_ether_addr(dev->dev_addr))
 110                 return -EADDRNOTAVAIL;
 111
 112         /* we hold the RTNL here so can safely walk the list */
 113         list_for_each_entry(nsdata, &local->interfaces, list) {
 114                 struct net_device *ndev = nsdata->dev;
 115
 116                 if (ndev != dev && ieee80211_sdata_running(nsdata)) {
 117                         /*
 118                          * Allow only a single IBSS interface to be up at any
 119                          * time. This is restricted because beacon distribution
 120                          * cannot work properly if both are in the same IBSS.
 121                          *
 122                          * To remove this restriction we'd have to disallow them
 123                          * from setting the same SSID on different IBSS interfaces
 124                          * belonging to the same hardware. Then, however, we're
 125                          * faced with having to adopt two different TSF timers...
 126                          */
 127                         if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
 128                             nsdata->vif.type == NL80211_IFTYPE_ADHOC)
 129                                 return -EBUSY;
 130
 131                         /*
 132                          * The remaining checks are only performed for interfaces
 133                          * with the same MAC address.
 134                          */
 135                         if (compare_ether_addr(dev->dev_addr, ndev->dev_addr))
 136                                 continue;
 137
 138                         /*
 139                          * check whether it may have the same address
 140                          */
 141                         if (!identical_mac_addr_allowed(sdata->vif.type,
 142                                                         nsdata->vif.type))
 143                                 return -ENOTUNIQ;
 144
 145                         /*
 146                          * can only add VLANs to enabled APs
 147                          */
 148                         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
 149                             nsdata->vif.type == NL80211_IFTYPE_AP)
 150                                 sdata->bss = &nsdata->u.ap;
 151                 }
 152         }
 153
 154         switch (sdata->vif.type) {
 155         case NL80211_IFTYPE_WDS:
 156                 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
 157                         return -ENOLINK;
 158                 break;
 159         case NL80211_IFTYPE_AP_VLAN:
 160                 if (!sdata->bss)
 161                         return -ENOLINK;
 162                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
 163                 break;
 164         case NL80211_IFTYPE_AP:
 165                 sdata->bss = &sdata->u.ap;
 166                 break;
 167         case NL80211_IFTYPE_MESH_POINT:
 168                 if (!ieee80211_vif_is_mesh(&sdata->vif))
 169                         break;
 170                 /* mesh ifaces must set allmulti to forward mcast traffic */
 171                 atomic_inc(&local->iff_allmultis);
 172                 break;
 173         case NL80211_IFTYPE_STATION:
 174         case NL80211_IFTYPE_MONITOR:
 175         case NL80211_IFTYPE_ADHOC:
 176                 /* no special treatment */
 177                 break;
 178         case NL80211_IFTYPE_UNSPECIFIED:
 179         case __NL80211_IFTYPE_AFTER_LAST:
 180                 /* cannot happen */
 181                 WARN_ON(1);
 182                 break;
 183         }
 184
 185         if (local->open_count == 0) {
 186                 res = drv_start(local);
 187                 if (res)
 188                         goto err_del_bss;
 189                 /* we're brought up, everything changes */
 190                 hw_reconf_flags = ~0;
 191                 ieee80211_led_radio(local, true);
 192         }
 193
 194         /*
 195          * Check all interfaces and copy the hopefully now-present
 196          * MAC address to those that have the special null one.
 197          */
 198         list_for_each_entry(nsdata, &local->interfaces, list) {
 199                 struct net_device *ndev = nsdata->dev;
 200
 201                 /*
 202                  * No need to check running since we do not allow
 203                  * it to start up with this invalid address.
 204                  */
 205                 if (compare_ether_addr(null_addr, ndev->dev_addr) == 0) {
 206                         memcpy(ndev->dev_addr,
 207                                local->hw.wiphy->perm_addr,
 208                                ETH_ALEN);
 209                         memcpy(ndev->perm_addr, ndev->dev_addr, ETH_ALEN);
 210                 }
 211         }
 212
 213         /*
 214          * Validate the MAC address for this device.
 215          */
 216         if (!is_valid_ether_addr(dev->dev_addr)) {
 217                 if (!local->open_count)
 218                         drv_stop(local);
 219                 return -EADDRNOTAVAIL;
 220         }
 221
 222         switch (sdata->vif.type) {
 223         case NL80211_IFTYPE_AP_VLAN:
 224                 /* no need to tell driver */
 225                 break;
 226         case NL80211_IFTYPE_MONITOR:
 227                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 228                         local->cooked_mntrs++;
 229                         break;
 230                 }
 231
 232                 /* must be before the call to ieee80211_configure_filter */
 233                 local->monitors++;
 234                 if (local->monitors == 1) {
 235                         local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
 236                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 237                 }
 238
 239                 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
 240                         local->fif_fcsfail++;
 241                 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
 242                         local->fif_plcpfail++;
 243                 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL) {
 244                         local->fif_control++;
 245                         local->fif_pspoll++;
 246                 }
 247                 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
 248                         local->fif_other_bss++;
 249
 250                 ieee80211_configure_filter(local);
 251                 break;
 252         default:
 253                 res = drv_add_interface(local, &sdata->vif);
 254                 if (res)
 255                         goto err_stop;
 256
 257                 if (ieee80211_vif_is_mesh(&sdata->vif)) {
 258                         local->fif_other_bss++;
 259                         ieee80211_configure_filter(local);
 260
 261                         ieee80211_start_mesh(sdata);
 262                 } else if (sdata->vif.type == NL80211_IFTYPE_AP) {
 263                         local->fif_pspoll++;
 264
 265                         ieee80211_configure_filter(local);
 266                 }
 267
 268                 changed |= ieee80211_reset_erp_info(sdata);
 269                 ieee80211_bss_info_change_notify(sdata, changed);
 270                 ieee80211_enable_keys(sdata);
 271
 272                 if (sdata->vif.type == NL80211_IFTYPE_STATION)
 273                         netif_carrier_off(dev);
 274                 else
 275                         netif_carrier_on(dev);
 276         }
 277
 278         if (sdata->vif.type == NL80211_IFTYPE_WDS) {
 279                 /* Create STA entry for the WDS peer */
 280                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
 281                                      GFP_KERNEL);
 282                 if (!sta) {
 283                         res = -ENOMEM;
 284                         goto err_del_interface;
 285                 }
 286
 287                 /* no locking required since STA is not live yet */
 288                 sta->flags |= WLAN_STA_AUTHORIZED;
 289
 290                 res = sta_info_insert(sta);
 291                 if (res) {
 292                         /* STA has been freed */
 293                         goto err_del_interface;
 294                 }
 295         }
 296
 297         /*
 298          * set_multicast_list will be invoked by the networking core
 299          * which will check whether any increments here were done in
 300          * error and sync them down to the hardware as filter flags.
 301          */
 302         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 303                 atomic_inc(&local->iff_allmultis);
 304
 305         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 306                 atomic_inc(&local->iff_promiscs);
 307
 308         hw_reconf_flags |= __ieee80211_recalc_idle(local);
 309
 310         local->open_count++;
 311         if (hw_reconf_flags) {
 312                 ieee80211_hw_config(local, hw_reconf_flags);
 313                 /*
 314                  * set default queue parameters so drivers don't
 315                  * need to initialise the hardware if the hardware
 316                  * doesn't start up with sane defaults
 317                  */
 318                 ieee80211_set_wmm_default(sdata);
 319         }
 320
 321         ieee80211_recalc_ps(local, -1);
 322
 323         /*
 324          * ieee80211_sta_work is disabled while network interface
 325          * is down. Therefore, some configuration changes may not
 326          * yet be effective. Trigger execution of ieee80211_sta_work
 327          * to fix this.
 328          */
 329         if (sdata->vif.type == NL80211_IFTYPE_STATION)
 330                 ieee80211_queue_work(&local->hw, &sdata->u.mgd.work);
 331
 332         netif_tx_start_all_queues(dev);
 333
 334         return 0;
 335  err_del_interface:
 336         drv_remove_interface(local, &sdata->vif);
 337  err_stop:
 338         if (!local->open_count)
 339                 drv_stop(local);
 340  err_del_bss:
 341         sdata->bss = NULL;
 342         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
 343                 list_del(&sdata->u.vlan.list);
 344         return res;
 345 }
 346
 347 static int ieee80211_stop(struct net_device *dev)
 348 {
 349         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 350         struct ieee80211_local *local = sdata->local;
 351         struct sta_info *sta;
 352         unsigned long flags;
 353         struct sk_buff *skb, *tmp;
 354         u32 hw_reconf_flags = 0;
 355         int i;
 356
 357         /*
 358          * Stop TX on this interface first.
 359          */
 360         netif_tx_stop_all_queues(dev);
 361
 362         /*
 363          * Purge work for this interface.
 364          */
 365         ieee80211_work_purge(sdata);
 366
 367         /*
 368          * Now delete all active aggregation sessions.
 369          */
 370         rcu_read_lock();
 371
 372         list_for_each_entry_rcu(sta, &local->sta_list, list) {
 373                 if (sta->sdata == sdata)
 374                         ieee80211_sta_tear_down_BA_sessions(sta);
 375         }
 376
 377         rcu_read_unlock();
 378
 379         /*
 380          * Remove all stations associated with this interface.
 381          *
 382          * This must be done before calling ops->remove_interface()
 383          * because otherwise we can later invoke ops->sta_notify()
 384          * whenever the STAs are removed, and that invalidates driver
 385          * assumptions about always getting a vif pointer that is valid
 386          * (because if we remove a STA after ops->remove_interface()
 387          * the driver will have removed the vif info already!)
 388          *
 389          * We could relax this and only unlink the stations from the
 390          * hash table and list but keep them on a per-sdata list that
 391          * will be inserted back again when the interface is brought
 392          * up again, but I don't currently see a use case for that,
 393          * except with WDS which gets a STA entry created when it is
 394          * brought up.
 395          */
 396         sta_info_flush(local, sdata);
 397
 398         /*
 399          * Don't count this interface for promisc/allmulti while it
 400          * is down. dev_mc_unsync() will invoke set_multicast_list
 401          * on the master interface which will sync these down to the
 402          * hardware as filter flags.
 403          */
 404         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 405                 atomic_dec(&local->iff_allmultis);
 406
 407         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 408                 atomic_dec(&local->iff_promiscs);
 409
 410         if (sdata->vif.type == NL80211_IFTYPE_AP)
 411                 local->fif_pspoll--;
 412
 413         netif_addr_lock_bh(dev);
 414         spin_lock_bh(&local->filter_lock);
 415         __hw_addr_unsync(&local->mc_list, &dev->mc, dev->addr_len);
 416         spin_unlock_bh(&local->filter_lock);
 417         netif_addr_unlock_bh(dev);
 418
 419         ieee80211_configure_filter(local);
 420
 421         del_timer_sync(&local->dynamic_ps_timer);
 422         cancel_work_sync(&local->dynamic_ps_enable_work);
 423
 424         /* APs need special treatment */
 425         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 426                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
 427                 struct beacon_data *old_beacon = sdata->u.ap.beacon;
 428
 429                 /* remove beacon */
 430                 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
 431                 synchronize_rcu();
 432                 kfree(old_beacon);
 433
 434                 /* down all dependent devices, that is VLANs */
 435                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
 436                                          u.vlan.list)
 437                         dev_close(vlan->dev);
 438                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
 439         }
 440
 441         local->open_count--;
 442
 443         switch (sdata->vif.type) {
 444         case NL80211_IFTYPE_AP_VLAN:
 445                 list_del(&sdata->u.vlan.list);
 446                 /* no need to tell driver */
 447                 break;
 448         case NL80211_IFTYPE_MONITOR:
 449                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 450                         local->cooked_mntrs--;
 451                         break;
 452                 }
 453
 454                 local->monitors--;
 455                 if (local->monitors == 0) {
 456                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
 457                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 458                 }
 459
 460                 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
 461                         local->fif_fcsfail--;
 462                 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
 463                         local->fif_plcpfail--;
 464                 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL) {
 465                         local->fif_pspoll--;
 466                         local->fif_control--;
 467                 }
 468                 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
 469                         local->fif_other_bss--;
 470
 471                 ieee80211_configure_filter(local);
 472                 break;
 473         case NL80211_IFTYPE_STATION:
 474                 del_timer_sync(&sdata->u.mgd.chswitch_timer);
 475                 del_timer_sync(&sdata->u.mgd.timer);
 476                 del_timer_sync(&sdata->u.mgd.conn_mon_timer);
 477                 del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
 478                 /*
 479                  * If any of the timers fired while we waited for it, it will
 480                  * have queued its work. Now the work will be running again
 481                  * but will not rearm the timer again because it checks
 482                  * whether the interface is running, which, at this point,
 483                  * it no longer is.
 484                  */
 485                 cancel_work_sync(&sdata->u.mgd.work);
 486                 cancel_work_sync(&sdata->u.mgd.chswitch_work);
 487                 cancel_work_sync(&sdata->u.mgd.monitor_work);
 488                 cancel_work_sync(&sdata->u.mgd.beacon_connection_loss_work);
 489
 490                 /*
 491                  * When we get here, the interface is marked down.
 492                  * Call synchronize_rcu() to wait for the RX path
 493                  * should it be using the interface and enqueuing
 494                  * frames at this very time on another CPU.
 495                  */
 496                 synchronize_rcu();
 497                 skb_queue_purge(&sdata->u.mgd.skb_queue);
 498                 /* fall through */
 499         case NL80211_IFTYPE_ADHOC:
 500                 if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 501                         del_timer_sync(&sdata->u.ibss.timer);
 502                         cancel_work_sync(&sdata->u.ibss.work);
 503                         synchronize_rcu();
 504                         skb_queue_purge(&sdata->u.ibss.skb_queue);
 505                 }
 506                 /* fall through */
 507         case NL80211_IFTYPE_MESH_POINT:
 508                 if (ieee80211_vif_is_mesh(&sdata->vif)) {
 509                         /* other_bss and allmulti are always set on mesh
 510                          * ifaces */
 511                         local->fif_other_bss--;
 512                         atomic_dec(&local->iff_allmultis);
 513
 514                         ieee80211_configure_filter(local);
 515
 516                         ieee80211_stop_mesh(sdata);
 517                 }
 518                 /* fall through */
 519         default:
 520                 if (local->scan_sdata == sdata)
 521                         ieee80211_scan_cancel(local);
 522
 523                 /*
 524                  * Disable beaconing for AP and mesh, IBSS can't
 525                  * still be joined to a network at this point.
 526                  */
 527                 if (sdata->vif.type == NL80211_IFTYPE_AP ||
 528                     sdata->vif.type == NL80211_IFTYPE_MESH_POINT) {
 529                         ieee80211_bss_info_change_notify(sdata,
 530                                 BSS_CHANGED_BEACON_ENABLED);
 531                 }
 532
 533                 /* disable all keys for as long as this netdev is down */
 534                 ieee80211_disable_keys(sdata);
 535                 drv_remove_interface(local, &sdata->vif);
 536         }
 537
 538         sdata->bss = NULL;
 539
 540         hw_reconf_flags |= __ieee80211_recalc_idle(local);
 541
 542         ieee80211_recalc_ps(local, -1);
 543
 544         if (local->open_count == 0) {
 545                 ieee80211_clear_tx_pending(local);
 546                 ieee80211_stop_device(local);
 547
 548                 /* no reconfiguring after stop! */
 549                 hw_reconf_flags = 0;
 550         }
 551
 552         /* do after stop to avoid reconfiguring when we stop anyway */
 553         if (hw_reconf_flags)
 554                 ieee80211_hw_config(local, hw_reconf_flags);
 555
 556         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 557         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 558                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
 559                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 560                         if (info->control.vif == &sdata->vif) {
 561                                 __skb_unlink(skb, &local->pending[i]);
 562                                 dev_kfree_skb_irq(skb);
 563                         }
 564                 }
 565         }
 566         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 567
 568         return 0;
 569 }
 570
 571 static void ieee80211_set_multicast_list(struct net_device *dev)
 572 {
 573         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 574         struct ieee80211_local *local = sdata->local;
 575         int allmulti, promisc, sdata_allmulti, sdata_promisc;
 576
 577         allmulti = !!(dev->flags & IFF_ALLMULTI);
 578         promisc = !!(dev->flags & IFF_PROMISC);
 579         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
 580         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
 581
 582         if (allmulti != sdata_allmulti) {
 583                 if (dev->flags & IFF_ALLMULTI)
 584                         atomic_inc(&local->iff_allmultis);
 585                 else
 586                         atomic_dec(&local->iff_allmultis);
 587                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
 588         }
 589
 590         if (promisc != sdata_promisc) {
 591                 if (dev->flags & IFF_PROMISC)
 592                         atomic_inc(&local->iff_promiscs);
 593                 else
 594                         atomic_dec(&local->iff_promiscs);
 595                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
 596         }
 597         spin_lock_bh(&local->filter_lock);
 598         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
 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 u16 ieee80211_netdev_select_queue(struct net_device *dev,
 662                                          struct sk_buff *skb)
 663 {
 664         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
 665 }
 666
 667 static const struct net_device_ops ieee80211_dataif_ops = {
 668         .ndo_open               = ieee80211_open,
 669         .ndo_stop               = ieee80211_stop,
 670         .ndo_uninit             = ieee80211_teardown_sdata,
 671         .ndo_start_xmit         = ieee80211_subif_start_xmit,
 672         .ndo_set_multicast_list = ieee80211_set_multicast_list,
 673         .ndo_change_mtu         = ieee80211_change_mtu,
 674         .ndo_set_mac_address    = ieee80211_change_mac,
 675         .ndo_select_queue       = ieee80211_netdev_select_queue,
 676 };
 677
 678 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
 679                                           struct sk_buff *skb)
 680 {
 681         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 682         struct ieee80211_local *local = sdata->local;
 683         struct ieee80211_hdr *hdr;
 684         struct ieee80211_radiotap_header *rtap = (void *)skb->data;
 685         u8 *p;
 686
 687         if (local->hw.queues < 4)
 688                 return 0;
 689
 690         if (skb->len < 4 ||
 691             skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
 692                 return 0; /* doesn't matter, frame will be dropped */
 693
 694         hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
 695
 696         if (!ieee80211_is_data(hdr->frame_control)) {
 697                 skb->priority = 7;
 698                 return ieee802_1d_to_ac[skb->priority];
 699         }
 700         if (!ieee80211_is_data_qos(hdr->frame_control)) {
 701                 skb->priority = 0;
 702                 return ieee802_1d_to_ac[skb->priority];
 703         }
 704
 705         p = ieee80211_get_qos_ctl(hdr);
 706         skb->priority = *p & IEEE80211_QOS_CTL_TAG1D_MASK;
 707
 708         return ieee80211_downgrade_queue(local, skb);
 709 }
 710
 711 static const struct net_device_ops ieee80211_monitorif_ops = {
 712         .ndo_open               = ieee80211_open,
 713         .ndo_stop               = ieee80211_stop,
 714         .ndo_uninit             = ieee80211_teardown_sdata,
 715         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
 716         .ndo_set_multicast_list = ieee80211_set_multicast_list,
 717         .ndo_change_mtu         = ieee80211_change_mtu,
 718         .ndo_set_mac_address    = eth_mac_addr,
 719         .ndo_select_queue       = ieee80211_monitor_select_queue,
 720 };
 721
 722 static void ieee80211_if_setup(struct net_device *dev)
 723 {
 724         ether_setup(dev);
 725         dev->netdev_ops = &ieee80211_dataif_ops;
 726         dev->destructor = free_netdev;
 727 }
 728
 729 /*
 730  * Helper function to initialise an interface to a specific type.
 731  */
 732 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
 733                                   enum nl80211_iftype type)
 734 {
 735         /* clear type-dependent union */
 736         memset(&sdata->u, 0, sizeof(sdata->u));
 737
 738         /* and set some type-dependent values */
 739         sdata->vif.type = type;
 740         sdata->dev->netdev_ops = &ieee80211_dataif_ops;
 741         sdata->wdev.iftype = type;
 742
 743         /* only monitor differs */
 744         sdata->dev->type = ARPHRD_ETHER;
 745
 746         switch (type) {
 747         case NL80211_IFTYPE_AP:
 748                 skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
 749                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
 750                 break;
 751         case NL80211_IFTYPE_STATION:
 752                 ieee80211_sta_setup_sdata(sdata);
 753                 break;
 754         case NL80211_IFTYPE_ADHOC:
 755                 ieee80211_ibss_setup_sdata(sdata);
 756                 break;
 757         case NL80211_IFTYPE_MESH_POINT:
 758                 if (ieee80211_vif_is_mesh(&sdata->vif))
 759                         ieee80211_mesh_init_sdata(sdata);
 760                 break;
 761         case NL80211_IFTYPE_MONITOR:
 762                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
 763                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
 764                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
 765                                       MONITOR_FLAG_OTHER_BSS;
 766                 break;
 767         case NL80211_IFTYPE_WDS:
 768         case NL80211_IFTYPE_AP_VLAN:
 769                 break;
 770         case NL80211_IFTYPE_UNSPECIFIED:
 771         case __NL80211_IFTYPE_AFTER_LAST:
 772                 BUG();
 773                 break;
 774         }
 775
 776         ieee80211_debugfs_add_netdev(sdata);
 777 }
 778
 779 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
 780                              enum nl80211_iftype type)
 781 {
 782         ASSERT_RTNL();
 783
 784         if (type == sdata->vif.type)
 785                 return 0;
 786
 787         /* Setting ad-hoc mode on non-IBSS channel is not supported. */
 788         if (sdata->local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS &&
 789             type == NL80211_IFTYPE_ADHOC)
 790                 return -EOPNOTSUPP;
 791
 792         /*
 793          * We could, here, on changes between IBSS/STA/MESH modes,
 794          * invoke an MLME function instead that disassociates etc.
 795          * and goes into the requested mode.
 796          */
 797
 798         if (ieee80211_sdata_running(sdata))
 799                 return -EBUSY;
 800
 801         /* Purge and reset type-dependent state. */
 802         ieee80211_teardown_sdata(sdata->dev);
 803         ieee80211_setup_sdata(sdata, type);
 804
 805         /* reset some values that shouldn't be kept across type changes */
 806         sdata->vif.bss_conf.basic_rates =
 807                 ieee80211_mandatory_rates(sdata->local,
 808                         sdata->local->hw.conf.channel->band);
 809         sdata->drop_unencrypted = 0;
 810         if (type == NL80211_IFTYPE_STATION)
 811                 sdata->u.mgd.use_4addr = false;
 812
 813         return 0;
 814 }
 815
 816 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
 817                                        struct net_device *dev,
 818                                        enum nl80211_iftype type)
 819 {
 820         struct ieee80211_sub_if_data *sdata;
 821         u64 mask, start, addr, val, inc;
 822         u8 *m;
 823         u8 tmp_addr[ETH_ALEN];
 824         int i;
 825
 826         /* default ... something at least */
 827         memcpy(dev->perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
 828
 829         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
 830             local->hw.wiphy->n_addresses <= 1)
 831                 return;
 832
 833
 834         mutex_lock(&local->iflist_mtx);
 835
 836         switch (type) {
 837         case NL80211_IFTYPE_MONITOR:
 838                 /* doesn't matter */
 839                 break;
 840         case NL80211_IFTYPE_WDS:
 841         case NL80211_IFTYPE_AP_VLAN:
 842                 /* match up with an AP interface */
 843                 list_for_each_entry(sdata, &local->interfaces, list) {
 844                         if (sdata->vif.type != NL80211_IFTYPE_AP)
 845                                 continue;
 846                         memcpy(dev->perm_addr, sdata->vif.addr, ETH_ALEN);
 847                         break;
 848                 }
 849                 /* keep default if no AP interface present */
 850                 break;
 851         default:
 852                 /* assign a new address if possible -- try n_addresses first */
 853                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
 854                         bool used = false;
 855
 856                         list_for_each_entry(sdata, &local->interfaces, list) {
 857                                 if (memcmp(local->hw.wiphy->addresses[i].addr,
 858                                            sdata->vif.addr, ETH_ALEN) == 0) {
 859                                         used = true;
 860                                         break;
 861                                 }
 862                         }
 863
 864                         if (!used) {
 865                                 memcpy(dev->perm_addr,
 866                                        local->hw.wiphy->addresses[i].addr,
 867                                        ETH_ALEN);
 868                                 break;
 869                         }
 870                 }
 871
 872                 /* try mask if available */
 873                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
 874                         break;
 875
 876                 m = local->hw.wiphy->addr_mask;
 877                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 878                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 879                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 880
 881                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
 882                         /* not a contiguous mask ... not handled now! */
 883                         printk(KERN_DEBUG "not contiguous\n");
 884                         break;
 885                 }
 886
 887                 m = local->hw.wiphy->perm_addr;
 888                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 889                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 890                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 891
 892                 inc = 1ULL<<__ffs64(mask);
 893                 val = (start & mask);
 894                 addr = (start & ~mask) | (val & mask);
 895                 do {
 896                         bool used = false;
 897
 898                         tmp_addr[5] = addr >> 0*8;
 899                         tmp_addr[4] = addr >> 1*8;
 900                         tmp_addr[3] = addr >> 2*8;
 901                         tmp_addr[2] = addr >> 3*8;
 902                         tmp_addr[1] = addr >> 4*8;
 903                         tmp_addr[0] = addr >> 5*8;
 904
 905                         val += inc;
 906
 907                         list_for_each_entry(sdata, &local->interfaces, list) {
 908                                 if (memcmp(tmp_addr, sdata->vif.addr,
 909                                                         ETH_ALEN) == 0) {
 910                                         used = true;
 911                                         break;
 912                                 }
 913                         }
 914
 915                         if (!used) {
 916                                 memcpy(dev->perm_addr, tmp_addr, ETH_ALEN);
 917                                 break;
 918                         }
 919                         addr = (start & ~mask) | (val & mask);
 920                 } while (addr != start);
 921
 922                 break;
 923         }
 924
 925         mutex_unlock(&local->iflist_mtx);
 926 }
 927
 928 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
 929                      struct net_device **new_dev, enum nl80211_iftype type,
 930                      struct vif_params *params)
 931 {
 932         struct net_device *ndev;
 933         struct ieee80211_sub_if_data *sdata = NULL;
 934         int ret, i;
 935
 936         ASSERT_RTNL();
 937
 938         ndev = alloc_netdev_mq(sizeof(*sdata) + local->hw.vif_data_size,
 939                                name, ieee80211_if_setup, local->hw.queues);
 940         if (!ndev)
 941                 return -ENOMEM;
 942         dev_net_set(ndev, wiphy_net(local->hw.wiphy));
 943
 944         ndev->needed_headroom = local->tx_headroom +
 945                                 4*6 /* four MAC addresses */
 946                                 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
 947                                 + 6 /* mesh */
 948                                 + 8 /* rfc1042/bridge tunnel */
 949                                 - ETH_HLEN /* ethernet hard_header_len */
 950                                 + IEEE80211_ENCRYPT_HEADROOM;
 951         ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
 952
 953         ret = dev_alloc_name(ndev, ndev->name);
 954         if (ret < 0)
 955                 goto fail;
 956
 957         ieee80211_assign_perm_addr(local, ndev, type);
 958         memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
 959         SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
 960
 961         /* don't use IEEE80211_DEV_TO_SUB_IF because it checks too much */
 962         sdata = netdev_priv(ndev);
 963         ndev->ieee80211_ptr = &sdata->wdev;
 964         memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
 965         memcpy(sdata->name, ndev->name, IFNAMSIZ);
 966
 967         /* initialise type-independent data */
 968         sdata->wdev.wiphy = local->hw.wiphy;
 969         sdata->local = local;
 970         sdata->dev = ndev;
 971
 972         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
 973                 skb_queue_head_init(&sdata->fragments[i].skb_list);
 974
 975         INIT_LIST_HEAD(&sdata->key_list);
 976
 977         for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
 978                 struct ieee80211_supported_band *sband;
 979                 sband = local->hw.wiphy->bands[i];
 980                 sdata->rc_rateidx_mask[i] =
 981                         sband ? (1 << sband->n_bitrates) - 1 : 0;
 982         }
 983
 984         /* setup type-dependent data */
 985         ieee80211_setup_sdata(sdata, type);
 986
 987         if (params) {
 988                 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
 989                 if (type == NL80211_IFTYPE_STATION)
 990                         sdata->u.mgd.use_4addr = params->use_4addr;
 991         }
 992
 993         ret = register_netdevice(ndev);
 994         if (ret)
 995                 goto fail;
 996
 997         if (ieee80211_vif_is_mesh(&sdata->vif) &&
 998             params && params->mesh_id_len)
 999                 ieee80211_sdata_set_mesh_id(sdata,
1000                                             params->mesh_id_len,
1001                                             params->mesh_id);
1002
1003         mutex_lock(&local->iflist_mtx);
1004         list_add_tail_rcu(&sdata->list, &local->interfaces);
1005         mutex_unlock(&local->iflist_mtx);
1006
1007         if (new_dev)
1008                 *new_dev = ndev;
1009
1010         return 0;
1011
1012  fail:
1013         free_netdev(ndev);
1014         return ret;
1015 }
1016
1017 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1018 {
1019         ASSERT_RTNL();
1020
1021         mutex_lock(&sdata->local->iflist_mtx);
1022         list_del_rcu(&sdata->list);
1023         mutex_unlock(&sdata->local->iflist_mtx);
1024
1025         synchronize_rcu();
1026         unregister_netdevice(sdata->dev);
1027 }
1028
1029 /*
1030  * Remove all interfaces, may only be called at hardware unregistration
1031  * time because it doesn't do RCU-safe list removals.
1032  */
1033 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1034 {
1035         struct ieee80211_sub_if_data *sdata, *tmp;
1036         LIST_HEAD(unreg_list);
1037
1038         ASSERT_RTNL();
1039
1040         mutex_lock(&local->iflist_mtx);
1041         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1042                 list_del(&sdata->list);
1043
1044                 unregister_netdevice_queue(sdata->dev, &unreg_list);
1045         }
1046         mutex_unlock(&local->iflist_mtx);
1047         unregister_netdevice_many(&unreg_list);
1048 }
1049
1050 static u32 ieee80211_idle_off(struct ieee80211_local *local,
1051                               const char *reason)
1052 {
1053         if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
1054                 return 0;
1055
1056 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1057         printk(KERN_DEBUG "%s: device no longer idle - %s\n",
1058                wiphy_name(local->hw.wiphy), reason);
1059 #endif
1060
1061         local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
1062         return IEEE80211_CONF_CHANGE_IDLE;
1063 }
1064
1065 static u32 ieee80211_idle_on(struct ieee80211_local *local)
1066 {
1067         if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
1068                 return 0;
1069
1070 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1071         printk(KERN_DEBUG "%s: device now idle\n",
1072                wiphy_name(local->hw.wiphy));
1073 #endif
1074
1075         drv_flush(local, false);
1076
1077         local->hw.conf.flags |= IEEE80211_CONF_IDLE;
1078         return IEEE80211_CONF_CHANGE_IDLE;
1079 }
1080
1081 u32 __ieee80211_recalc_idle(struct ieee80211_local *local)
1082 {
1083         struct ieee80211_sub_if_data *sdata;
1084         int count = 0;
1085
1086         if (!list_empty(&local->work_list))
1087                 return ieee80211_idle_off(local, "working");
1088
1089         if (local->scanning)
1090                 return ieee80211_idle_off(local, "scanning");
1091
1092         list_for_each_entry(sdata, &local->interfaces, list) {
1093                 if (!ieee80211_sdata_running(sdata))
1094                         continue;
1095                 /* do not count disabled managed interfaces */
1096                 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1097                     !sdata->u.mgd.associated)
1098                         continue;
1099                 /* do not count unused IBSS interfaces */
1100                 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
1101                     !sdata->u.ibss.ssid_len)
1102                         continue;
1103                 /* count everything else */
1104                 count++;
1105         }
1106
1107         if (!count)
1108                 return ieee80211_idle_on(local);
1109         else
1110                 return ieee80211_idle_off(local, "in use");
1111
1112         return 0;
1113 }
1114
1115 void ieee80211_recalc_idle(struct ieee80211_local *local)
1116 {
1117         u32 chg;
1118
1119         mutex_lock(&local->iflist_mtx);
1120         chg = __ieee80211_recalc_idle(local);
1121         mutex_unlock(&local->iflist_mtx);
1122         if (chg)
1123                 ieee80211_hw_config(local, chg);
1124 }
1125
1126 static int netdev_notify(struct notifier_block *nb,
1127                          unsigned long state,
1128                          void *ndev)
1129 {
1130         struct net_device *dev = ndev;
1131         struct ieee80211_sub_if_data *sdata;
1132
1133         if (state != NETDEV_CHANGENAME)
1134                 return 0;
1135
1136         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1137                 return 0;
1138
1139         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1140                 return 0;
1141
1142         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1143
1144         memcpy(sdata->name, dev->name, IFNAMSIZ);
1145
1146         ieee80211_debugfs_rename_netdev(sdata);
1147         return 0;
1148 }
1149
1150 static struct notifier_block mac80211_netdev_notifier = {
1151         .notifier_call = netdev_notify,
1152 };
1153
1154 int ieee80211_iface_init(void)
1155 {
1156         return register_netdevice_notifier(&mac80211_netdev_notifier);
1157 }
1158
1159 void ieee80211_iface_exit(void)
1160 {
1161         unregister_netdevice_notifier(&mac80211_netdev_notifier);
1162 }