net/mac80211/iface.c

   1 /*
   2  * Interface handling (except master interface)
   3  *
   4  * Copyright 2002-2005, Instant802 Networks, Inc.
   5  * Copyright 2005-2006, Devicescape Software, Inc.
   6  * Copyright (c) 2006 Jiri Benc <jbenc@suse.cz>
   7  * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13 #include <linux/slab.h>
  14 #include <linux/kernel.h>
  15 #include <linux/if_arp.h>
  16 #include <linux/netdevice.h>
  17 #include <linux/rtnetlink.h>
  18 #include <net/mac80211.h>
  19 #include <net/ieee80211_radiotap.h>
  20 #include "ieee80211_i.h"
  21 #include "sta_info.h"
  22 #include "debugfs_netdev.h"
  23 #include "mesh.h"
  24 #include "led.h"
  25 #include "driver-ops.h"
  26 #include "wme.h"
  27
  28 /**
  29  * DOC: Interface list locking
  30  *
  31  * The interface list in each struct ieee80211_local is protected
  32  * three-fold:
  33  *
  34  * (1) modifications may only be done under the RTNL
  35  * (2) modifications and readers are protected against each other by
  36  *     the iflist_mtx.
  37  * (3) modifications are done in an RCU manner so atomic readers
  38  *     can traverse the list in RCU-safe blocks.
  39  *
  40  * As a consequence, reads (traversals) of the list can be protected
  41  * by either the RTNL, the iflist_mtx or RCU.
  42  */
  43
  44
  45 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
  46 {
  47         int meshhdrlen;
  48         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
  49
  50         meshhdrlen = (sdata->vif.type == NL80211_IFTYPE_MESH_POINT) ? 5 : 0;
  51
  52         /* FIX: what would be proper limits for MTU?
  53          * This interface uses 802.3 frames. */
  54         if (new_mtu < 256 ||
  55             new_mtu > IEEE80211_MAX_DATA_LEN - 24 - 6 - meshhdrlen) {
  56                 return -EINVAL;
  57         }
  58
  59 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
  60         printk(KERN_DEBUG "%s: setting MTU %d\n", dev->name, new_mtu);
  61 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
  62         dev->mtu = new_mtu;
  63         return 0;
  64 }
  65
  66 static int ieee80211_change_mac(struct net_device *dev, void *addr)
  67 {
  68         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
  69         struct sockaddr *sa = addr;
  70         int ret;
  71
  72         if (ieee80211_sdata_running(sdata))
  73                 return -EBUSY;
  74
  75         ret = eth_mac_addr(dev, sa);
  76
  77         if (ret == 0)
  78                 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
  79
  80         return ret;
  81 }
  82
  83 static inline int identical_mac_addr_allowed(int type1, int type2)
  84 {
  85         return type1 == NL80211_IFTYPE_MONITOR ||
  86                 type2 == NL80211_IFTYPE_MONITOR ||
  87                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
  88                 (type1 == NL80211_IFTYPE_WDS &&
  89                         (type2 == NL80211_IFTYPE_WDS ||
  90                          type2 == NL80211_IFTYPE_AP)) ||
  91                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
  92                 (type1 == NL80211_IFTYPE_AP_VLAN &&
  93                         (type2 == NL80211_IFTYPE_AP ||
  94                          type2 == NL80211_IFTYPE_AP_VLAN));
  95 }
  96
  97 static int ieee80211_open(struct net_device *dev)
  98 {
  99         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 100         struct ieee80211_sub_if_data *nsdata;
 101         struct ieee80211_local *local = sdata->local;
 102         struct sta_info *sta;
 103         u32 changed = 0;
 104         int res;
 105         u32 hw_reconf_flags = 0;
 106         u8 null_addr[ETH_ALEN] = {0};
 107
 108         /* fail early if user set an invalid address */
 109         if (compare_ether_addr(dev->dev_addr, null_addr) &&
 110             !is_valid_ether_addr(dev->dev_addr))
 111                 return -EADDRNOTAVAIL;
 112
 113         /* we hold the RTNL here so can safely walk the list */
 114         list_for_each_entry(nsdata, &local->interfaces, list) {
 115                 struct net_device *ndev = nsdata->dev;
 116
 117                 if (ndev != dev && ieee80211_sdata_running(nsdata)) {
 118                         /*
 119                          * Allow only a single IBSS interface to be up at any
 120                          * time. This is restricted because beacon distribution
 121                          * cannot work properly if both are in the same IBSS.
 122                          *
 123                          * To remove this restriction we'd have to disallow them
 124                          * from setting the same SSID on different IBSS interfaces
 125                          * belonging to the same hardware. Then, however, we're
 126                          * faced with having to adopt two different TSF timers...
 127                          */
 128                         if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
 129                             nsdata->vif.type == NL80211_IFTYPE_ADHOC)
 130                                 return -EBUSY;
 131
 132                         /*
 133                          * The remaining checks are only performed for interfaces
 134                          * with the same MAC address.
 135                          */
 136                         if (compare_ether_addr(dev->dev_addr, ndev->dev_addr))
 137                                 continue;
 138
 139                         /*
 140                          * check whether it may have the same address
 141                          */
 142                         if (!identical_mac_addr_allowed(sdata->vif.type,
 143                                                         nsdata->vif.type))
 144                                 return -ENOTUNIQ;
 145
 146                         /*
 147                          * can only add VLANs to enabled APs
 148                          */
 149                         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
 150                             nsdata->vif.type == NL80211_IFTYPE_AP)
 151                                 sdata->bss = &nsdata->u.ap;
 152                 }
 153         }
 154
 155         switch (sdata->vif.type) {
 156         case NL80211_IFTYPE_WDS:
 157                 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
 158                         return -ENOLINK;
 159                 break;
 160         case NL80211_IFTYPE_AP_VLAN:
 161                 if (!sdata->bss)
 162                         return -ENOLINK;
 163                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
 164                 break;
 165         case NL80211_IFTYPE_AP:
 166                 sdata->bss = &sdata->u.ap;
 167                 break;
 168         case NL80211_IFTYPE_MESH_POINT:
 169                 if (!ieee80211_vif_is_mesh(&sdata->vif))
 170                         break;
 171                 /* mesh ifaces must set allmulti to forward mcast traffic */
 172                 atomic_inc(&local->iff_allmultis);
 173                 break;
 174         case NL80211_IFTYPE_STATION:
 175         case NL80211_IFTYPE_MONITOR:
 176         case NL80211_IFTYPE_ADHOC:
 177                 /* no special treatment */
 178                 break;
 179         case NL80211_IFTYPE_UNSPECIFIED:
 180         case __NL80211_IFTYPE_AFTER_LAST:
 181                 /* cannot happen */
 182                 WARN_ON(1);
 183                 break;
 184         }
 185
 186         if (local->open_count == 0) {
 187                 res = drv_start(local);
 188                 if (res)
 189                         goto err_del_bss;
 190                 /* we're brought up, everything changes */
 191                 hw_reconf_flags = ~0;
 192                 ieee80211_led_radio(local, true);
 193         }
 194
 195         /*
 196          * Check all interfaces and copy the hopefully now-present
 197          * MAC address to those that have the special null one.
 198          */
 199         list_for_each_entry(nsdata, &local->interfaces, list) {
 200                 struct net_device *ndev = nsdata->dev;
 201
 202                 /*
 203                  * No need to check running since we do not allow
 204                  * it to start up with this invalid address.
 205                  */
 206                 if (compare_ether_addr(null_addr, ndev->dev_addr) == 0) {
 207                         memcpy(ndev->dev_addr,
 208                                local->hw.wiphy->perm_addr,
 209                                ETH_ALEN);
 210                         memcpy(ndev->perm_addr, ndev->dev_addr, ETH_ALEN);
 211                 }
 212         }
 213
 214         /*
 215          * Validate the MAC address for this device.
 216          */
 217         if (!is_valid_ether_addr(dev->dev_addr)) {
 218                 if (!local->open_count)
 219                         drv_stop(local);
 220                 return -EADDRNOTAVAIL;
 221         }
 222
 223         switch (sdata->vif.type) {
 224         case NL80211_IFTYPE_AP_VLAN:
 225                 /* no need to tell driver */
 226                 break;
 227         case NL80211_IFTYPE_MONITOR:
 228                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 229                         local->cooked_mntrs++;
 230                         break;
 231                 }
 232
 233                 /* must be before the call to ieee80211_configure_filter */
 234                 local->monitors++;
 235                 if (local->monitors == 1) {
 236                         local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
 237                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 238                 }
 239
 240                 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
 241                         local->fif_fcsfail++;
 242                 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
 243                         local->fif_plcpfail++;
 244                 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL) {
 245                         local->fif_control++;
 246                         local->fif_pspoll++;
 247                 }
 248                 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
 249                         local->fif_other_bss++;
 250
 251                 ieee80211_configure_filter(local);
 252                 break;
 253         default:
 254                 res = drv_add_interface(local, &sdata->vif);
 255                 if (res)
 256                         goto err_stop;
 257
 258                 if (ieee80211_vif_is_mesh(&sdata->vif)) {
 259                         local->fif_other_bss++;
 260                         ieee80211_configure_filter(local);
 261
 262                         ieee80211_start_mesh(sdata);
 263                 } else if (sdata->vif.type == NL80211_IFTYPE_AP) {
 264                         local->fif_pspoll++;
 265
 266                         ieee80211_configure_filter(local);
 267                 }
 268
 269                 changed |= ieee80211_reset_erp_info(sdata);
 270                 ieee80211_bss_info_change_notify(sdata, changed);
 271
 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         netif_tx_start_all_queues(dev);
 324
 325         return 0;
 326  err_del_interface:
 327         drv_remove_interface(local, &sdata->vif);
 328  err_stop:
 329         if (!local->open_count)
 330                 drv_stop(local);
 331  err_del_bss:
 332         sdata->bss = NULL;
 333         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
 334                 list_del(&sdata->u.vlan.list);
 335         return res;
 336 }
 337
 338 static int ieee80211_stop(struct net_device *dev)
 339 {
 340         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 341         struct ieee80211_local *local = sdata->local;
 342         struct sta_info *sta;
 343         unsigned long flags;
 344         struct sk_buff *skb, *tmp;
 345         u32 hw_reconf_flags = 0;
 346         int i;
 347
 348         /*
 349          * Stop TX on this interface first.
 350          */
 351         netif_tx_stop_all_queues(dev);
 352
 353         /*
 354          * Purge work for this interface.
 355          */
 356         ieee80211_work_purge(sdata);
 357
 358         /*
 359          * Now delete all active aggregation sessions.
 360          */
 361         rcu_read_lock();
 362
 363         list_for_each_entry_rcu(sta, &local->sta_list, list) {
 364                 if (sta->sdata == sdata)
 365                         ieee80211_sta_tear_down_BA_sessions(sta);
 366         }
 367
 368         rcu_read_unlock();
 369
 370         /*
 371          * Remove all stations associated with this interface.
 372          *
 373          * This must be done before calling ops->remove_interface()
 374          * because otherwise we can later invoke ops->sta_notify()
 375          * whenever the STAs are removed, and that invalidates driver
 376          * assumptions about always getting a vif pointer that is valid
 377          * (because if we remove a STA after ops->remove_interface()
 378          * the driver will have removed the vif info already!)
 379          *
 380          * We could relax this and only unlink the stations from the
 381          * hash table and list but keep them on a per-sdata list that
 382          * will be inserted back again when the interface is brought
 383          * up again, but I don't currently see a use case for that,
 384          * except with WDS which gets a STA entry created when it is
 385          * brought up.
 386          */
 387         sta_info_flush(local, sdata);
 388
 389         /*
 390          * Don't count this interface for promisc/allmulti while it
 391          * is down. dev_mc_unsync() will invoke set_multicast_list
 392          * on the master interface which will sync these down to the
 393          * hardware as filter flags.
 394          */
 395         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 396                 atomic_dec(&local->iff_allmultis);
 397
 398         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 399                 atomic_dec(&local->iff_promiscs);
 400
 401         if (sdata->vif.type == NL80211_IFTYPE_AP)
 402                 local->fif_pspoll--;
 403
 404         netif_addr_lock_bh(dev);
 405         spin_lock_bh(&local->filter_lock);
 406         __hw_addr_unsync(&local->mc_list, &dev->mc, dev->addr_len);
 407         spin_unlock_bh(&local->filter_lock);
 408         netif_addr_unlock_bh(dev);
 409
 410         ieee80211_configure_filter(local);
 411
 412         del_timer_sync(&local->dynamic_ps_timer);
 413         cancel_work_sync(&local->dynamic_ps_enable_work);
 414
 415         /* APs need special treatment */
 416         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 417                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
 418                 struct beacon_data *old_beacon = sdata->u.ap.beacon;
 419
 420                 /* remove beacon */
 421                 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
 422                 synchronize_rcu();
 423                 kfree(old_beacon);
 424
 425                 /* down all dependent devices, that is VLANs */
 426                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
 427                                          u.vlan.list)
 428                         dev_close(vlan->dev);
 429                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
 430         }
 431
 432         local->open_count--;
 433
 434         switch (sdata->vif.type) {
 435         case NL80211_IFTYPE_AP_VLAN:
 436                 list_del(&sdata->u.vlan.list);
 437                 /* no need to tell driver */
 438                 break;
 439         case NL80211_IFTYPE_MONITOR:
 440                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 441                         local->cooked_mntrs--;
 442                         break;
 443                 }
 444
 445                 local->monitors--;
 446                 if (local->monitors == 0) {
 447                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
 448                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 449                 }
 450
 451                 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
 452                         local->fif_fcsfail--;
 453                 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
 454                         local->fif_plcpfail--;
 455                 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL) {
 456                         local->fif_pspoll--;
 457                         local->fif_control--;
 458                 }
 459                 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
 460                         local->fif_other_bss--;
 461
 462                 ieee80211_configure_filter(local);
 463                 break;
 464         case NL80211_IFTYPE_STATION:
 465                 del_timer_sync(&sdata->u.mgd.chswitch_timer);
 466                 del_timer_sync(&sdata->u.mgd.timer);
 467                 del_timer_sync(&sdata->u.mgd.conn_mon_timer);
 468                 del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
 469                 /*
 470                  * If any of the timers fired while we waited for it, it will
 471                  * have queued its work. Now the work will be running again
 472                  * but will not rearm the timer again because it checks
 473                  * whether the interface is running, which, at this point,
 474                  * it no longer is.
 475                  */
 476                 cancel_work_sync(&sdata->u.mgd.work);
 477                 cancel_work_sync(&sdata->u.mgd.chswitch_work);
 478                 cancel_work_sync(&sdata->u.mgd.monitor_work);
 479                 cancel_work_sync(&sdata->u.mgd.beacon_connection_loss_work);
 480
 481                 /*
 482                  * When we get here, the interface is marked down.
 483                  * Call synchronize_rcu() to wait for the RX path
 484                  * should it be using the interface and enqueuing
 485                  * frames at this very time on another CPU.
 486                  */
 487                 synchronize_rcu();
 488                 skb_queue_purge(&sdata->u.mgd.skb_queue);
 489                 /* fall through */
 490         case NL80211_IFTYPE_ADHOC:
 491                 if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 492                         del_timer_sync(&sdata->u.ibss.timer);
 493                         cancel_work_sync(&sdata->u.ibss.work);
 494                         synchronize_rcu();
 495                         skb_queue_purge(&sdata->u.ibss.skb_queue);
 496                 }
 497                 /* fall through */
 498         case NL80211_IFTYPE_MESH_POINT:
 499                 if (ieee80211_vif_is_mesh(&sdata->vif)) {
 500                         /* other_bss and allmulti are always set on mesh
 501                          * ifaces */
 502                         local->fif_other_bss--;
 503                         atomic_dec(&local->iff_allmultis);
 504
 505                         ieee80211_configure_filter(local);
 506
 507                         ieee80211_stop_mesh(sdata);
 508                 }
 509                 /* fall through */
 510         default:
 511                 if (local->scan_sdata == sdata)
 512                         ieee80211_scan_cancel(local);
 513
 514                 /*
 515                  * Disable beaconing for AP and mesh, IBSS can't
 516                  * still be joined to a network at this point.
 517                  */
 518                 if (sdata->vif.type == NL80211_IFTYPE_AP ||
 519                     sdata->vif.type == NL80211_IFTYPE_MESH_POINT) {
 520                         ieee80211_bss_info_change_notify(sdata,
 521                                 BSS_CHANGED_BEACON_ENABLED);
 522                 }
 523
 524                 /* free all remaining keys, there shouldn't be any */
 525                 ieee80211_free_keys(sdata);
 526                 drv_remove_interface(local, &sdata->vif);
 527         }
 528
 529         sdata->bss = NULL;
 530
 531         hw_reconf_flags |= __ieee80211_recalc_idle(local);
 532
 533         ieee80211_recalc_ps(local, -1);
 534
 535         if (local->open_count == 0) {
 536                 ieee80211_clear_tx_pending(local);
 537                 ieee80211_stop_device(local);
 538
 539                 /* no reconfiguring after stop! */
 540                 hw_reconf_flags = 0;
 541         }
 542
 543         /* do after stop to avoid reconfiguring when we stop anyway */
 544         if (hw_reconf_flags)
 545                 ieee80211_hw_config(local, hw_reconf_flags);
 546
 547         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 548         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 549                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
 550                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 551                         if (info->control.vif == &sdata->vif) {
 552                                 __skb_unlink(skb, &local->pending[i]);
 553                                 dev_kfree_skb_irq(skb);
 554                         }
 555                 }
 556         }
 557         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 558
 559         return 0;
 560 }
 561
 562 static void ieee80211_set_multicast_list(struct net_device *dev)
 563 {
 564         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 565         struct ieee80211_local *local = sdata->local;
 566         int allmulti, promisc, sdata_allmulti, sdata_promisc;
 567
 568         allmulti = !!(dev->flags & IFF_ALLMULTI);
 569         promisc = !!(dev->flags & IFF_PROMISC);
 570         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
 571         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
 572
 573         if (allmulti != sdata_allmulti) {
 574                 if (dev->flags & IFF_ALLMULTI)
 575                         atomic_inc(&local->iff_allmultis);
 576                 else
 577                         atomic_dec(&local->iff_allmultis);
 578                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
 579         }
 580
 581         if (promisc != sdata_promisc) {
 582                 if (dev->flags & IFF_PROMISC)
 583                         atomic_inc(&local->iff_promiscs);
 584                 else
 585                         atomic_dec(&local->iff_promiscs);
 586                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
 587         }
 588         spin_lock_bh(&local->filter_lock);
 589         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
 590         spin_unlock_bh(&local->filter_lock);
 591         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
 592 }
 593
 594 /*
 595  * Called when the netdev is removed or, by the code below, before
 596  * the interface type changes.
 597  */
 598 static void ieee80211_teardown_sdata(struct net_device *dev)
 599 {
 600         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 601         struct ieee80211_local *local = sdata->local;
 602         struct beacon_data *beacon;
 603         struct sk_buff *skb;
 604         int flushed;
 605         int i;
 606
 607         /* free extra data */
 608         ieee80211_free_keys(sdata);
 609
 610         ieee80211_debugfs_remove_netdev(sdata);
 611
 612         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
 613                 __skb_queue_purge(&sdata->fragments[i].skb_list);
 614         sdata->fragment_next = 0;
 615
 616         switch (sdata->vif.type) {
 617         case NL80211_IFTYPE_AP:
 618                 beacon = sdata->u.ap.beacon;
 619                 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
 620                 synchronize_rcu();
 621                 kfree(beacon);
 622
 623                 while ((skb = skb_dequeue(&sdata->u.ap.ps_bc_buf))) {
 624                         local->total_ps_buffered--;
 625                         dev_kfree_skb(skb);
 626                 }
 627
 628                 break;
 629         case NL80211_IFTYPE_MESH_POINT:
 630                 if (ieee80211_vif_is_mesh(&sdata->vif))
 631                         mesh_rmc_free(sdata);
 632                 break;
 633         case NL80211_IFTYPE_ADHOC:
 634                 if (WARN_ON(sdata->u.ibss.presp))
 635                         kfree_skb(sdata->u.ibss.presp);
 636                 break;
 637         case NL80211_IFTYPE_STATION:
 638         case NL80211_IFTYPE_WDS:
 639         case NL80211_IFTYPE_AP_VLAN:
 640         case NL80211_IFTYPE_MONITOR:
 641                 break;
 642         case NL80211_IFTYPE_UNSPECIFIED:
 643         case __NL80211_IFTYPE_AFTER_LAST:
 644                 BUG();
 645                 break;
 646         }
 647
 648         flushed = sta_info_flush(local, sdata);
 649         WARN_ON(flushed);
 650 }
 651
 652 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
 653                                          struct sk_buff *skb)
 654 {
 655         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
 656 }
 657
 658 static const struct net_device_ops ieee80211_dataif_ops = {
 659         .ndo_open               = ieee80211_open,
 660         .ndo_stop               = ieee80211_stop,
 661         .ndo_uninit             = ieee80211_teardown_sdata,
 662         .ndo_start_xmit         = ieee80211_subif_start_xmit,
 663         .ndo_set_multicast_list = ieee80211_set_multicast_list,
 664         .ndo_change_mtu         = ieee80211_change_mtu,
 665         .ndo_set_mac_address    = ieee80211_change_mac,
 666         .ndo_select_queue       = ieee80211_netdev_select_queue,
 667 };
 668
 669 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
 670                                           struct sk_buff *skb)
 671 {
 672         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 673         struct ieee80211_local *local = sdata->local;
 674         struct ieee80211_hdr *hdr;
 675         struct ieee80211_radiotap_header *rtap = (void *)skb->data;
 676         u8 *p;
 677
 678         if (local->hw.queues < 4)
 679                 return 0;
 680
 681         if (skb->len < 4 ||
 682             skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
 683                 return 0; /* doesn't matter, frame will be dropped */
 684
 685         hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
 686
 687         if (!ieee80211_is_data(hdr->frame_control)) {
 688                 skb->priority = 7;
 689                 return ieee802_1d_to_ac[skb->priority];
 690         }
 691         if (!ieee80211_is_data_qos(hdr->frame_control)) {
 692                 skb->priority = 0;
 693                 return ieee802_1d_to_ac[skb->priority];
 694         }
 695
 696         p = ieee80211_get_qos_ctl(hdr);
 697         skb->priority = *p & IEEE80211_QOS_CTL_TAG1D_MASK;
 698
 699         return ieee80211_downgrade_queue(local, skb);
 700 }
 701
 702 static const struct net_device_ops ieee80211_monitorif_ops = {
 703         .ndo_open               = ieee80211_open,
 704         .ndo_stop               = ieee80211_stop,
 705         .ndo_uninit             = ieee80211_teardown_sdata,
 706         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
 707         .ndo_set_multicast_list = ieee80211_set_multicast_list,
 708         .ndo_change_mtu         = ieee80211_change_mtu,
 709         .ndo_set_mac_address    = eth_mac_addr,
 710         .ndo_select_queue       = ieee80211_monitor_select_queue,
 711 };
 712
 713 static void ieee80211_if_setup(struct net_device *dev)
 714 {
 715         ether_setup(dev);
 716         dev->netdev_ops = &ieee80211_dataif_ops;
 717         dev->destructor = free_netdev;
 718 }
 719
 720 /*
 721  * Helper function to initialise an interface to a specific type.
 722  */
 723 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
 724                                   enum nl80211_iftype type)
 725 {
 726         /* clear type-dependent union */
 727         memset(&sdata->u, 0, sizeof(sdata->u));
 728
 729         /* and set some type-dependent values */
 730         sdata->vif.type = type;
 731         sdata->dev->netdev_ops = &ieee80211_dataif_ops;
 732         sdata->wdev.iftype = type;
 733
 734         /* only monitor differs */
 735         sdata->dev->type = ARPHRD_ETHER;
 736
 737         switch (type) {
 738         case NL80211_IFTYPE_AP:
 739                 skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
 740                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
 741                 break;
 742         case NL80211_IFTYPE_STATION:
 743                 ieee80211_sta_setup_sdata(sdata);
 744                 break;
 745         case NL80211_IFTYPE_ADHOC:
 746                 ieee80211_ibss_setup_sdata(sdata);
 747                 break;
 748         case NL80211_IFTYPE_MESH_POINT:
 749                 if (ieee80211_vif_is_mesh(&sdata->vif))
 750                         ieee80211_mesh_init_sdata(sdata);
 751                 break;
 752         case NL80211_IFTYPE_MONITOR:
 753                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
 754                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
 755                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
 756                                       MONITOR_FLAG_OTHER_BSS;
 757                 break;
 758         case NL80211_IFTYPE_WDS:
 759         case NL80211_IFTYPE_AP_VLAN:
 760                 break;
 761         case NL80211_IFTYPE_UNSPECIFIED:
 762         case __NL80211_IFTYPE_AFTER_LAST:
 763                 BUG();
 764                 break;
 765         }
 766
 767         ieee80211_debugfs_add_netdev(sdata);
 768 }
 769
 770 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
 771                              enum nl80211_iftype type)
 772 {
 773         ASSERT_RTNL();
 774
 775         if (type == sdata->vif.type)
 776                 return 0;
 777
 778         /* Setting ad-hoc mode on non-IBSS channel is not supported. */
 779         if (sdata->local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS &&
 780             type == NL80211_IFTYPE_ADHOC)
 781                 return -EOPNOTSUPP;
 782
 783         /*
 784          * We could, here, on changes between IBSS/STA/MESH modes,
 785          * invoke an MLME function instead that disassociates etc.
 786          * and goes into the requested mode.
 787          */
 788
 789         if (ieee80211_sdata_running(sdata))
 790                 return -EBUSY;
 791
 792         /* Purge and reset type-dependent state. */
 793         ieee80211_teardown_sdata(sdata->dev);
 794         ieee80211_setup_sdata(sdata, type);
 795
 796         /* reset some values that shouldn't be kept across type changes */
 797         sdata->vif.bss_conf.basic_rates =
 798                 ieee80211_mandatory_rates(sdata->local,
 799                         sdata->local->hw.conf.channel->band);
 800         sdata->drop_unencrypted = 0;
 801         if (type == NL80211_IFTYPE_STATION)
 802                 sdata->u.mgd.use_4addr = false;
 803
 804         return 0;
 805 }
 806
 807 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
 808                                        struct net_device *dev,
 809                                        enum nl80211_iftype type)
 810 {
 811         struct ieee80211_sub_if_data *sdata;
 812         u64 mask, start, addr, val, inc;
 813         u8 *m;
 814         u8 tmp_addr[ETH_ALEN];
 815         int i;
 816
 817         /* default ... something at least */
 818         memcpy(dev->perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
 819
 820         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
 821             local->hw.wiphy->n_addresses <= 1)
 822                 return;
 823
 824
 825         mutex_lock(&local->iflist_mtx);
 826
 827         switch (type) {
 828         case NL80211_IFTYPE_MONITOR:
 829                 /* doesn't matter */
 830                 break;
 831         case NL80211_IFTYPE_WDS:
 832         case NL80211_IFTYPE_AP_VLAN:
 833                 /* match up with an AP interface */
 834                 list_for_each_entry(sdata, &local->interfaces, list) {
 835                         if (sdata->vif.type != NL80211_IFTYPE_AP)
 836                                 continue;
 837                         memcpy(dev->perm_addr, sdata->vif.addr, ETH_ALEN);
 838                         break;
 839                 }
 840                 /* keep default if no AP interface present */
 841                 break;
 842         default:
 843                 /* assign a new address if possible -- try n_addresses first */
 844                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
 845                         bool used = false;
 846
 847                         list_for_each_entry(sdata, &local->interfaces, list) {
 848                                 if (memcmp(local->hw.wiphy->addresses[i].addr,
 849                                            sdata->vif.addr, ETH_ALEN) == 0) {
 850                                         used = true;
 851                                         break;
 852                                 }
 853                         }
 854
 855                         if (!used) {
 856                                 memcpy(dev->perm_addr,
 857                                        local->hw.wiphy->addresses[i].addr,
 858                                        ETH_ALEN);
 859                                 break;
 860                         }
 861                 }
 862
 863                 /* try mask if available */
 864                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
 865                         break;
 866
 867                 m = local->hw.wiphy->addr_mask;
 868                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 869                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 870                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 871
 872                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
 873                         /* not a contiguous mask ... not handled now! */
 874                         printk(KERN_DEBUG "not contiguous\n");
 875                         break;
 876                 }
 877
 878                 m = local->hw.wiphy->perm_addr;
 879                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 880                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 881                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 882
 883                 inc = 1ULL<<__ffs64(mask);
 884                 val = (start & mask);
 885                 addr = (start & ~mask) | (val & mask);
 886                 do {
 887                         bool used = false;
 888
 889                         tmp_addr[5] = addr >> 0*8;
 890                         tmp_addr[4] = addr >> 1*8;
 891                         tmp_addr[3] = addr >> 2*8;
 892                         tmp_addr[2] = addr >> 3*8;
 893                         tmp_addr[1] = addr >> 4*8;
 894                         tmp_addr[0] = addr >> 5*8;
 895
 896                         val += inc;
 897
 898                         list_for_each_entry(sdata, &local->interfaces, list) {
 899                                 if (memcmp(tmp_addr, sdata->vif.addr,
 900                                                         ETH_ALEN) == 0) {
 901                                         used = true;
 902                                         break;
 903                                 }
 904                         }
 905
 906                         if (!used) {
 907                                 memcpy(dev->perm_addr, tmp_addr, ETH_ALEN);
 908                                 break;
 909                         }
 910                         addr = (start & ~mask) | (val & mask);
 911                 } while (addr != start);
 912
 913                 break;
 914         }
 915
 916         mutex_unlock(&local->iflist_mtx);
 917 }
 918
 919 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
 920                      struct net_device **new_dev, enum nl80211_iftype type,
 921                      struct vif_params *params)
 922 {
 923         struct net_device *ndev;
 924         struct ieee80211_sub_if_data *sdata = NULL;
 925         int ret, i;
 926
 927         ASSERT_RTNL();
 928
 929         ndev = alloc_netdev_mq(sizeof(*sdata) + local->hw.vif_data_size,
 930                                name, ieee80211_if_setup, local->hw.queues);
 931         if (!ndev)
 932                 return -ENOMEM;
 933         dev_net_set(ndev, wiphy_net(local->hw.wiphy));
 934
 935         ndev->needed_headroom = local->tx_headroom +
 936                                 4*6 /* four MAC addresses */
 937                                 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
 938                                 + 6 /* mesh */
 939                                 + 8 /* rfc1042/bridge tunnel */
 940                                 - ETH_HLEN /* ethernet hard_header_len */
 941                                 + IEEE80211_ENCRYPT_HEADROOM;
 942         ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
 943
 944         ret = dev_alloc_name(ndev, ndev->name);
 945         if (ret < 0)
 946                 goto fail;
 947
 948         ieee80211_assign_perm_addr(local, ndev, type);
 949         memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
 950         SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
 951
 952         /* don't use IEEE80211_DEV_TO_SUB_IF because it checks too much */
 953         sdata = netdev_priv(ndev);
 954         ndev->ieee80211_ptr = &sdata->wdev;
 955         memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
 956         memcpy(sdata->name, ndev->name, IFNAMSIZ);
 957
 958         /* initialise type-independent data */
 959         sdata->wdev.wiphy = local->hw.wiphy;
 960         sdata->local = local;
 961         sdata->dev = ndev;
 962
 963         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
 964                 skb_queue_head_init(&sdata->fragments[i].skb_list);
 965
 966         INIT_LIST_HEAD(&sdata->key_list);
 967
 968         for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
 969                 struct ieee80211_supported_band *sband;
 970                 sband = local->hw.wiphy->bands[i];
 971                 sdata->rc_rateidx_mask[i] =
 972                         sband ? (1 << sband->n_bitrates) - 1 : 0;
 973         }
 974
 975         /* setup type-dependent data */
 976         ieee80211_setup_sdata(sdata, type);
 977
 978         if (params) {
 979                 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
 980                 if (type == NL80211_IFTYPE_STATION)
 981                         sdata->u.mgd.use_4addr = params->use_4addr;
 982         }
 983
 984         ret = register_netdevice(ndev);
 985         if (ret)
 986                 goto fail;
 987
 988         if (ieee80211_vif_is_mesh(&sdata->vif) &&
 989             params && params->mesh_id_len)
 990                 ieee80211_sdata_set_mesh_id(sdata,
 991                                             params->mesh_id_len,
 992                                             params->mesh_id);
 993
 994         mutex_lock(&local->iflist_mtx);
 995         list_add_tail_rcu(&sdata->list, &local->interfaces);
 996         mutex_unlock(&local->iflist_mtx);
 997
 998         if (new_dev)
 999                 *new_dev = ndev;
1000
1001         return 0;
1002
1003  fail:
1004         free_netdev(ndev);
1005         return ret;
1006 }
1007
1008 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1009 {
1010         ASSERT_RTNL();
1011
1012         mutex_lock(&sdata->local->iflist_mtx);
1013         list_del_rcu(&sdata->list);
1014         mutex_unlock(&sdata->local->iflist_mtx);
1015
1016         synchronize_rcu();
1017         unregister_netdevice(sdata->dev);
1018 }
1019
1020 /*
1021  * Remove all interfaces, may only be called at hardware unregistration
1022  * time because it doesn't do RCU-safe list removals.
1023  */
1024 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1025 {
1026         struct ieee80211_sub_if_data *sdata, *tmp;
1027         LIST_HEAD(unreg_list);
1028
1029         ASSERT_RTNL();
1030
1031         mutex_lock(&local->iflist_mtx);
1032         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1033                 list_del(&sdata->list);
1034
1035                 unregister_netdevice_queue(sdata->dev, &unreg_list);
1036         }
1037         mutex_unlock(&local->iflist_mtx);
1038         unregister_netdevice_many(&unreg_list);
1039 }
1040
1041 static u32 ieee80211_idle_off(struct ieee80211_local *local,
1042                               const char *reason)
1043 {
1044         if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
1045                 return 0;
1046
1047 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1048         printk(KERN_DEBUG "%s: device no longer idle - %s\n",
1049                wiphy_name(local->hw.wiphy), reason);
1050 #endif
1051
1052         local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
1053         return IEEE80211_CONF_CHANGE_IDLE;
1054 }
1055
1056 static u32 ieee80211_idle_on(struct ieee80211_local *local)
1057 {
1058         if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
1059                 return 0;
1060
1061 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1062         printk(KERN_DEBUG "%s: device now idle\n",
1063                wiphy_name(local->hw.wiphy));
1064 #endif
1065
1066         drv_flush(local, false);
1067
1068         local->hw.conf.flags |= IEEE80211_CONF_IDLE;
1069         return IEEE80211_CONF_CHANGE_IDLE;
1070 }
1071
1072 u32 __ieee80211_recalc_idle(struct ieee80211_local *local)
1073 {
1074         struct ieee80211_sub_if_data *sdata;
1075         int count = 0;
1076
1077         if (!list_empty(&local->work_list))
1078                 return ieee80211_idle_off(local, "working");
1079
1080         if (local->scanning)
1081                 return ieee80211_idle_off(local, "scanning");
1082
1083         list_for_each_entry(sdata, &local->interfaces, list) {
1084                 if (!ieee80211_sdata_running(sdata))
1085                         continue;
1086                 /* do not count disabled managed interfaces */
1087                 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1088                     !sdata->u.mgd.associated)
1089                         continue;
1090                 /* do not count unused IBSS interfaces */
1091                 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
1092                     !sdata->u.ibss.ssid_len)
1093                         continue;
1094                 /* count everything else */
1095                 count++;
1096         }
1097
1098         if (!count)
1099                 return ieee80211_idle_on(local);
1100         else
1101                 return ieee80211_idle_off(local, "in use");
1102
1103         return 0;
1104 }
1105
1106 void ieee80211_recalc_idle(struct ieee80211_local *local)
1107 {
1108         u32 chg;
1109
1110         mutex_lock(&local->iflist_mtx);
1111         chg = __ieee80211_recalc_idle(local);
1112         mutex_unlock(&local->iflist_mtx);
1113         if (chg)
1114                 ieee80211_hw_config(local, chg);
1115 }
1116
1117 static int netdev_notify(struct notifier_block *nb,
1118                          unsigned long state,
1119                          void *ndev)
1120 {
1121         struct net_device *dev = ndev;
1122         struct ieee80211_sub_if_data *sdata;
1123
1124         if (state != NETDEV_CHANGENAME)
1125                 return 0;
1126
1127         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1128                 return 0;
1129
1130         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1131                 return 0;
1132
1133         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1134
1135         memcpy(sdata->name, dev->name, IFNAMSIZ);
1136
1137         ieee80211_debugfs_rename_netdev(sdata);
1138         return 0;
1139 }
1140
1141 static struct notifier_block mac80211_netdev_notifier = {
1142         .notifier_call = netdev_notify,
1143 };
1144
1145 int ieee80211_iface_init(void)
1146 {
1147         return register_netdevice_notifier(&mac80211_netdev_notifier);
1148 }
1149
1150 void ieee80211_iface_exit(void)
1151 {
1152         unregister_netdevice_notifier(&mac80211_netdev_notifier);
1153 }