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         __dev_addr_unsync(&local->mc_list, &local->mc_count,
 416                           &dev->mc_list, &dev->mc_count);
 417         spin_unlock_bh(&local->filter_lock);
 418         netif_addr_unlock_bh(dev);
 419
 420         ieee80211_configure_filter(local);
 421
 422         del_timer_sync(&local->dynamic_ps_timer);
 423         cancel_work_sync(&local->dynamic_ps_enable_work);
 424
 425         /* APs need special treatment */
 426         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 427                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
 428                 struct beacon_data *old_beacon = sdata->u.ap.beacon;
 429
 430                 /* remove beacon */
 431                 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
 432                 synchronize_rcu();
 433                 kfree(old_beacon);
 434
 435                 /* down all dependent devices, that is VLANs */
 436                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
 437                                          u.vlan.list)
 438                         dev_close(vlan->dev);
 439                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
 440         }
 441
 442         local->open_count--;
 443
 444         switch (sdata->vif.type) {
 445         case NL80211_IFTYPE_AP_VLAN:
 446                 list_del(&sdata->u.vlan.list);
 447                 /* no need to tell driver */
 448                 break;
 449         case NL80211_IFTYPE_MONITOR:
 450                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 451                         local->cooked_mntrs--;
 452                         break;
 453                 }
 454
 455                 local->monitors--;
 456                 if (local->monitors == 0) {
 457                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
 458                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 459                 }
 460
 461                 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
 462                         local->fif_fcsfail--;
 463                 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
 464                         local->fif_plcpfail--;
 465                 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL) {
 466                         local->fif_pspoll--;
 467                         local->fif_control--;
 468                 }
 469                 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
 470                         local->fif_other_bss--;
 471
 472                 ieee80211_configure_filter(local);
 473                 break;
 474         case NL80211_IFTYPE_STATION:
 475                 del_timer_sync(&sdata->u.mgd.chswitch_timer);
 476                 del_timer_sync(&sdata->u.mgd.timer);
 477                 del_timer_sync(&sdata->u.mgd.conn_mon_timer);
 478                 del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
 479                 /*
 480                  * If any of the timers fired while we waited for it, it will
 481                  * have queued its work. Now the work will be running again
 482                  * but will not rearm the timer again because it checks
 483                  * whether the interface is running, which, at this point,
 484                  * it no longer is.
 485                  */
 486                 cancel_work_sync(&sdata->u.mgd.work);
 487                 cancel_work_sync(&sdata->u.mgd.chswitch_work);
 488                 cancel_work_sync(&sdata->u.mgd.monitor_work);
 489                 cancel_work_sync(&sdata->u.mgd.beacon_loss_work);
 490
 491                 /*
 492                  * When we get here, the interface is marked down.
 493                  * Call synchronize_rcu() to wait for the RX path
 494                  * should it be using the interface and enqueuing
 495                  * frames at this very time on another CPU.
 496                  */
 497                 synchronize_rcu();
 498                 skb_queue_purge(&sdata->u.mgd.skb_queue);
 499                 /* fall through */
 500         case NL80211_IFTYPE_ADHOC:
 501                 if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 502                         del_timer_sync(&sdata->u.ibss.timer);
 503                         cancel_work_sync(&sdata->u.ibss.work);
 504                         synchronize_rcu();
 505                         skb_queue_purge(&sdata->u.ibss.skb_queue);
 506                 }
 507                 /* fall through */
 508         case NL80211_IFTYPE_MESH_POINT:
 509                 if (ieee80211_vif_is_mesh(&sdata->vif)) {
 510                         /* other_bss and allmulti are always set on mesh
 511                          * ifaces */
 512                         local->fif_other_bss--;
 513                         atomic_dec(&local->iff_allmultis);
 514
 515                         ieee80211_configure_filter(local);
 516
 517                         ieee80211_stop_mesh(sdata);
 518                 }
 519                 /* fall through */
 520         default:
 521                 if (local->scan_sdata == sdata)
 522                         ieee80211_scan_cancel(local);
 523
 524                 /*
 525                  * Disable beaconing for AP and mesh, IBSS can't
 526                  * still be joined to a network at this point.
 527                  */
 528                 if (sdata->vif.type == NL80211_IFTYPE_AP ||
 529                     sdata->vif.type == NL80211_IFTYPE_MESH_POINT) {
 530                         ieee80211_bss_info_change_notify(sdata,
 531                                 BSS_CHANGED_BEACON_ENABLED);
 532                 }
 533
 534                 /* disable all keys for as long as this netdev is down */
 535                 ieee80211_disable_keys(sdata);
 536                 drv_remove_interface(local, &sdata->vif);
 537         }
 538
 539         sdata->bss = NULL;
 540
 541         hw_reconf_flags |= __ieee80211_recalc_idle(local);
 542
 543         ieee80211_recalc_ps(local, -1);
 544
 545         if (local->open_count == 0) {
 546                 ieee80211_clear_tx_pending(local);
 547                 ieee80211_stop_device(local);
 548
 549                 /* no reconfiguring after stop! */
 550                 hw_reconf_flags = 0;
 551         }
 552
 553         /* do after stop to avoid reconfiguring when we stop anyway */
 554         if (hw_reconf_flags)
 555                 ieee80211_hw_config(local, hw_reconf_flags);
 556
 557         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 558         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 559                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
 560                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 561                         if (info->control.vif == &sdata->vif) {
 562                                 __skb_unlink(skb, &local->pending[i]);
 563                                 dev_kfree_skb_irq(skb);
 564                         }
 565                 }
 566         }
 567         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 568
 569         return 0;
 570 }
 571
 572 static void ieee80211_set_multicast_list(struct net_device *dev)
 573 {
 574         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 575         struct ieee80211_local *local = sdata->local;
 576         int allmulti, promisc, sdata_allmulti, sdata_promisc;
 577
 578         allmulti = !!(dev->flags & IFF_ALLMULTI);
 579         promisc = !!(dev->flags & IFF_PROMISC);
 580         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
 581         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
 582
 583         if (allmulti != sdata_allmulti) {
 584                 if (dev->flags & IFF_ALLMULTI)
 585                         atomic_inc(&local->iff_allmultis);
 586                 else
 587                         atomic_dec(&local->iff_allmultis);
 588                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
 589         }
 590
 591         if (promisc != sdata_promisc) {
 592                 if (dev->flags & IFF_PROMISC)
 593                         atomic_inc(&local->iff_promiscs);
 594                 else
 595                         atomic_dec(&local->iff_promiscs);
 596                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
 597         }
 598         spin_lock_bh(&local->filter_lock);
 599         __dev_addr_sync(&local->mc_list, &local->mc_count,
 600                         &dev->mc_list, &dev->mc_count);
 601         spin_unlock_bh(&local->filter_lock);
 602         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
 603 }
 604
 605 /*
 606  * Called when the netdev is removed or, by the code below, before
 607  * the interface type changes.
 608  */
 609 static void ieee80211_teardown_sdata(struct net_device *dev)
 610 {
 611         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 612         struct ieee80211_local *local = sdata->local;
 613         struct beacon_data *beacon;
 614         struct sk_buff *skb;
 615         int flushed;
 616         int i;
 617
 618         /* free extra data */
 619         ieee80211_free_keys(sdata);
 620
 621         ieee80211_debugfs_remove_netdev(sdata);
 622
 623         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
 624                 __skb_queue_purge(&sdata->fragments[i].skb_list);
 625         sdata->fragment_next = 0;
 626
 627         switch (sdata->vif.type) {
 628         case NL80211_IFTYPE_AP:
 629                 beacon = sdata->u.ap.beacon;
 630                 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
 631                 synchronize_rcu();
 632                 kfree(beacon);
 633
 634                 while ((skb = skb_dequeue(&sdata->u.ap.ps_bc_buf))) {
 635                         local->total_ps_buffered--;
 636                         dev_kfree_skb(skb);
 637                 }
 638
 639                 break;
 640         case NL80211_IFTYPE_MESH_POINT:
 641                 if (ieee80211_vif_is_mesh(&sdata->vif))
 642                         mesh_rmc_free(sdata);
 643                 break;
 644         case NL80211_IFTYPE_ADHOC:
 645                 if (WARN_ON(sdata->u.ibss.presp))
 646                         kfree_skb(sdata->u.ibss.presp);
 647                 break;
 648         case NL80211_IFTYPE_STATION:
 649         case NL80211_IFTYPE_WDS:
 650         case NL80211_IFTYPE_AP_VLAN:
 651         case NL80211_IFTYPE_MONITOR:
 652                 break;
 653         case NL80211_IFTYPE_UNSPECIFIED:
 654         case __NL80211_IFTYPE_AFTER_LAST:
 655                 BUG();
 656                 break;
 657         }
 658
 659         flushed = sta_info_flush(local, sdata);
 660         WARN_ON(flushed);
 661 }
 662
 663 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
 664                                          struct sk_buff *skb)
 665 {
 666         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
 667 }
 668
 669 static const struct net_device_ops ieee80211_dataif_ops = {
 670         .ndo_open               = ieee80211_open,
 671         .ndo_stop               = ieee80211_stop,
 672         .ndo_uninit             = ieee80211_teardown_sdata,
 673         .ndo_start_xmit         = ieee80211_subif_start_xmit,
 674         .ndo_set_multicast_list = ieee80211_set_multicast_list,
 675         .ndo_change_mtu         = ieee80211_change_mtu,
 676         .ndo_set_mac_address    = ieee80211_change_mac,
 677         .ndo_select_queue       = ieee80211_netdev_select_queue,
 678 };
 679
 680 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
 681                                           struct sk_buff *skb)
 682 {
 683         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 684         struct ieee80211_local *local = sdata->local;
 685         struct ieee80211_hdr *hdr;
 686         struct ieee80211_radiotap_header *rtap = (void *)skb->data;
 687
 688         if (local->hw.queues < 4)
 689                 return 0;
 690
 691         if (skb->len < 4 ||
 692             skb->len < rtap->it_len + 2 /* frame control */)
 693                 return 0; /* doesn't matter, frame will be dropped */
 694
 695         hdr = (void *)((u8 *)skb->data + rtap->it_len);
 696
 697         if (!ieee80211_is_data(hdr->frame_control)) {
 698                 skb->priority = 7;
 699                 return ieee802_1d_to_ac[skb->priority];
 700         }
 701
 702         return ieee80211_downgrade_queue(local, skb);
 703 }
 704
 705 static const struct net_device_ops ieee80211_monitorif_ops = {
 706         .ndo_open               = ieee80211_open,
 707         .ndo_stop               = ieee80211_stop,
 708         .ndo_uninit             = ieee80211_teardown_sdata,
 709         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
 710         .ndo_set_multicast_list = ieee80211_set_multicast_list,
 711         .ndo_change_mtu         = ieee80211_change_mtu,
 712         .ndo_set_mac_address    = eth_mac_addr,
 713         .ndo_select_queue       = ieee80211_monitor_select_queue,
 714 };
 715
 716 static void ieee80211_if_setup(struct net_device *dev)
 717 {
 718         ether_setup(dev);
 719         dev->netdev_ops = &ieee80211_dataif_ops;
 720         dev->destructor = free_netdev;
 721 }
 722
 723 /*
 724  * Helper function to initialise an interface to a specific type.
 725  */
 726 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
 727                                   enum nl80211_iftype type)
 728 {
 729         /* clear type-dependent union */
 730         memset(&sdata->u, 0, sizeof(sdata->u));
 731
 732         /* and set some type-dependent values */
 733         sdata->vif.type = type;
 734         sdata->dev->netdev_ops = &ieee80211_dataif_ops;
 735         sdata->wdev.iftype = type;
 736
 737         /* only monitor differs */
 738         sdata->dev->type = ARPHRD_ETHER;
 739
 740         switch (type) {
 741         case NL80211_IFTYPE_AP:
 742                 skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
 743                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
 744                 break;
 745         case NL80211_IFTYPE_STATION:
 746                 ieee80211_sta_setup_sdata(sdata);
 747                 break;
 748         case NL80211_IFTYPE_ADHOC:
 749                 ieee80211_ibss_setup_sdata(sdata);
 750                 break;
 751         case NL80211_IFTYPE_MESH_POINT:
 752                 if (ieee80211_vif_is_mesh(&sdata->vif))
 753                         ieee80211_mesh_init_sdata(sdata);
 754                 break;
 755         case NL80211_IFTYPE_MONITOR:
 756                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
 757                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
 758                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
 759                                       MONITOR_FLAG_OTHER_BSS;
 760                 break;
 761         case NL80211_IFTYPE_WDS:
 762         case NL80211_IFTYPE_AP_VLAN:
 763                 break;
 764         case NL80211_IFTYPE_UNSPECIFIED:
 765         case __NL80211_IFTYPE_AFTER_LAST:
 766                 BUG();
 767                 break;
 768         }
 769
 770         ieee80211_debugfs_add_netdev(sdata);
 771 }
 772
 773 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
 774                              enum nl80211_iftype type)
 775 {
 776         ASSERT_RTNL();
 777
 778         if (type == sdata->vif.type)
 779                 return 0;
 780
 781         /* Setting ad-hoc mode on non-IBSS channel is not supported. */
 782         if (sdata->local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS &&
 783             type == NL80211_IFTYPE_ADHOC)
 784                 return -EOPNOTSUPP;
 785
 786         /*
 787          * We could, here, on changes between IBSS/STA/MESH modes,
 788          * invoke an MLME function instead that disassociates etc.
 789          * and goes into the requested mode.
 790          */
 791
 792         if (ieee80211_sdata_running(sdata))
 793                 return -EBUSY;
 794
 795         /* Purge and reset type-dependent state. */
 796         ieee80211_teardown_sdata(sdata->dev);
 797         ieee80211_setup_sdata(sdata, type);
 798
 799         /* reset some values that shouldn't be kept across type changes */
 800         sdata->vif.bss_conf.basic_rates =
 801                 ieee80211_mandatory_rates(sdata->local,
 802                         sdata->local->hw.conf.channel->band);
 803         sdata->drop_unencrypted = 0;
 804         if (type == NL80211_IFTYPE_STATION)
 805                 sdata->u.mgd.use_4addr = false;
 806
 807         return 0;
 808 }
 809
 810 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
 811                      struct net_device **new_dev, enum nl80211_iftype type,
 812                      struct vif_params *params)
 813 {
 814         struct net_device *ndev;
 815         struct ieee80211_sub_if_data *sdata = NULL;
 816         int ret, i;
 817
 818         ASSERT_RTNL();
 819
 820         ndev = alloc_netdev_mq(sizeof(*sdata) + local->hw.vif_data_size,
 821                                name, ieee80211_if_setup, local->hw.queues);
 822         if (!ndev)
 823                 return -ENOMEM;
 824         dev_net_set(ndev, wiphy_net(local->hw.wiphy));
 825
 826         ndev->needed_headroom = local->tx_headroom +
 827                                 4*6 /* four MAC addresses */
 828                                 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
 829                                 + 6 /* mesh */
 830                                 + 8 /* rfc1042/bridge tunnel */
 831                                 - ETH_HLEN /* ethernet hard_header_len */
 832                                 + IEEE80211_ENCRYPT_HEADROOM;
 833         ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
 834
 835         ret = dev_alloc_name(ndev, ndev->name);
 836         if (ret < 0)
 837                 goto fail;
 838
 839         memcpy(ndev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
 840         memcpy(ndev->perm_addr, ndev->dev_addr, ETH_ALEN);
 841         SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
 842
 843         /* don't use IEEE80211_DEV_TO_SUB_IF because it checks too much */
 844         sdata = netdev_priv(ndev);
 845         ndev->ieee80211_ptr = &sdata->wdev;
 846         memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
 847         memcpy(sdata->name, ndev->name, IFNAMSIZ);
 848
 849         /* initialise type-independent data */
 850         sdata->wdev.wiphy = local->hw.wiphy;
 851         sdata->local = local;
 852         sdata->dev = ndev;
 853
 854         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
 855                 skb_queue_head_init(&sdata->fragments[i].skb_list);
 856
 857         INIT_LIST_HEAD(&sdata->key_list);
 858
 859         sdata->force_unicast_rateidx = -1;
 860         sdata->max_ratectrl_rateidx = -1;
 861
 862         /* setup type-dependent data */
 863         ieee80211_setup_sdata(sdata, type);
 864
 865         if (params) {
 866                 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
 867                 if (type == NL80211_IFTYPE_STATION)
 868                         sdata->u.mgd.use_4addr = params->use_4addr;
 869         }
 870
 871         ret = register_netdevice(ndev);
 872         if (ret)
 873                 goto fail;
 874
 875         if (ieee80211_vif_is_mesh(&sdata->vif) &&
 876             params && params->mesh_id_len)
 877                 ieee80211_sdata_set_mesh_id(sdata,
 878                                             params->mesh_id_len,
 879                                             params->mesh_id);
 880
 881         mutex_lock(&local->iflist_mtx);
 882         list_add_tail_rcu(&sdata->list, &local->interfaces);
 883         mutex_unlock(&local->iflist_mtx);
 884
 885         if (new_dev)
 886                 *new_dev = ndev;
 887
 888         return 0;
 889
 890  fail:
 891         free_netdev(ndev);
 892         return ret;
 893 }
 894
 895 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
 896 {
 897         ASSERT_RTNL();
 898
 899         mutex_lock(&sdata->local->iflist_mtx);
 900         list_del_rcu(&sdata->list);
 901         mutex_unlock(&sdata->local->iflist_mtx);
 902
 903         synchronize_rcu();
 904         unregister_netdevice(sdata->dev);
 905 }
 906
 907 /*
 908  * Remove all interfaces, may only be called at hardware unregistration
 909  * time because it doesn't do RCU-safe list removals.
 910  */
 911 void ieee80211_remove_interfaces(struct ieee80211_local *local)
 912 {
 913         struct ieee80211_sub_if_data *sdata, *tmp;
 914         LIST_HEAD(unreg_list);
 915
 916         ASSERT_RTNL();
 917
 918         mutex_lock(&local->iflist_mtx);
 919         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
 920                 list_del(&sdata->list);
 921
 922                 unregister_netdevice_queue(sdata->dev, &unreg_list);
 923         }
 924         mutex_unlock(&local->iflist_mtx);
 925         unregister_netdevice_many(&unreg_list);
 926 }
 927
 928 static u32 ieee80211_idle_off(struct ieee80211_local *local,
 929                               const char *reason)
 930 {
 931         if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
 932                 return 0;
 933
 934 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 935         printk(KERN_DEBUG "%s: device no longer idle - %s\n",
 936                wiphy_name(local->hw.wiphy), reason);
 937 #endif
 938
 939         local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
 940         return IEEE80211_CONF_CHANGE_IDLE;
 941 }
 942
 943 static u32 ieee80211_idle_on(struct ieee80211_local *local)
 944 {
 945         if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
 946                 return 0;
 947
 948 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 949         printk(KERN_DEBUG "%s: device now idle\n",
 950                wiphy_name(local->hw.wiphy));
 951 #endif
 952
 953         drv_flush(local, false);
 954
 955         local->hw.conf.flags |= IEEE80211_CONF_IDLE;
 956         return IEEE80211_CONF_CHANGE_IDLE;
 957 }
 958
 959 u32 __ieee80211_recalc_idle(struct ieee80211_local *local)
 960 {
 961         struct ieee80211_sub_if_data *sdata;
 962         int count = 0;
 963
 964         if (!list_empty(&local->work_list))
 965                 return ieee80211_idle_off(local, "working");
 966
 967         if (local->scanning)
 968                 return ieee80211_idle_off(local, "scanning");
 969
 970         list_for_each_entry(sdata, &local->interfaces, list) {
 971                 if (!ieee80211_sdata_running(sdata))
 972                         continue;
 973                 /* do not count disabled managed interfaces */
 974                 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
 975                     !sdata->u.mgd.associated)
 976                         continue;
 977                 /* do not count unused IBSS interfaces */
 978                 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
 979                     !sdata->u.ibss.ssid_len)
 980                         continue;
 981                 /* count everything else */
 982                 count++;
 983         }
 984
 985         if (!count)
 986                 return ieee80211_idle_on(local);
 987         else
 988                 return ieee80211_idle_off(local, "in use");
 989
 990         return 0;
 991 }
 992
 993 void ieee80211_recalc_idle(struct ieee80211_local *local)
 994 {
 995         u32 chg;
 996
 997         mutex_lock(&local->iflist_mtx);
 998         chg = __ieee80211_recalc_idle(local);
 999         mutex_unlock(&local->iflist_mtx);
1000         if (chg)
1001                 ieee80211_hw_config(local, chg);
1002 }
1003
1004 static int netdev_notify(struct notifier_block *nb,
1005                          unsigned long state,
1006                          void *ndev)
1007 {
1008         struct net_device *dev = ndev;
1009         struct ieee80211_sub_if_data *sdata;
1010
1011         if (state != NETDEV_CHANGENAME)
1012                 return 0;
1013
1014         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1015                 return 0;
1016
1017         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1018                 return 0;
1019
1020         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1021
1022         memcpy(sdata->name, sdata->name, IFNAMSIZ);
1023
1024         ieee80211_debugfs_rename_netdev(sdata);
1025         return 0;
1026 }
1027
1028 static struct notifier_block mac80211_netdev_notifier = {
1029         .notifier_call = netdev_notify,
1030 };
1031
1032 int ieee80211_iface_init(void)
1033 {
1034         return register_netdevice_notifier(&mac80211_netdev_notifier);
1035 }
1036
1037 void ieee80211_iface_exit(void)
1038 {
1039         unregister_netdevice_notifier(&mac80211_netdev_notifier);
1040 }