net/mac80211/iface.c

   1 /*
   2  * Interface handling (except master interface)
   3  *
   4  * Copyright 2002-2005, Instant802 Networks, Inc.
   5  * Copyright 2005-2006, Devicescape Software, Inc.
   6  * Copyright (c) 2006 Jiri Benc <jbenc@suse.cz>
   7  * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13 #include <linux/kernel.h>
  14 #include <linux/if_arp.h>
  15 #include <linux/netdevice.h>
  16 #include <linux/rtnetlink.h>
  17 #include <net/mac80211.h>
  18 #include "ieee80211_i.h"
  19 #include "sta_info.h"
  20 #include "debugfs_netdev.h"
  21 #include "mesh.h"
  22 #include "led.h"
  23 #include "driver-ops.h"
  24
  25 /**
  26  * DOC: Interface list locking
  27  *
  28  * The interface list in each struct ieee80211_local is protected
  29  * three-fold:
  30  *
  31  * (1) modifications may only be done under the RTNL
  32  * (2) modifications and readers are protected against each other by
  33  *     the iflist_mtx.
  34  * (3) modifications are done in an RCU manner so atomic readers
  35  *     can traverse the list in RCU-safe blocks.
  36  *
  37  * As a consequence, reads (traversals) of the list can be protected
  38  * by either the RTNL, the iflist_mtx or RCU.
  39  */
  40
  41
  42 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
  43 {
  44         int meshhdrlen;
  45         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
  46
  47         meshhdrlen = (sdata->vif.type == NL80211_IFTYPE_MESH_POINT) ? 5 : 0;
  48
  49         /* FIX: what would be proper limits for MTU?
  50          * This interface uses 802.3 frames. */
  51         if (new_mtu < 256 ||
  52             new_mtu > IEEE80211_MAX_DATA_LEN - 24 - 6 - meshhdrlen) {
  53                 return -EINVAL;
  54         }
  55
  56 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
  57         printk(KERN_DEBUG "%s: setting MTU %d\n", dev->name, new_mtu);
  58 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
  59         dev->mtu = new_mtu;
  60         return 0;
  61 }
  62
  63 static int ieee80211_change_mac(struct net_device *dev, void *addr)
  64 {
  65         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
  66         int ret;
  67
  68         if (ieee80211_sdata_running(sdata))
  69                 return -EBUSY;
  70
  71         ret = eth_mac_addr(dev, addr);
  72
  73         if (ret == 0)
  74                 memcpy(sdata->vif.addr, addr, ETH_ALEN);
  75
  76         return ret;
  77 }
  78
  79 static inline int identical_mac_addr_allowed(int type1, int type2)
  80 {
  81         return type1 == NL80211_IFTYPE_MONITOR ||
  82                 type2 == NL80211_IFTYPE_MONITOR ||
  83                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
  84                 (type1 == NL80211_IFTYPE_WDS &&
  85                         (type2 == NL80211_IFTYPE_WDS ||
  86                          type2 == NL80211_IFTYPE_AP)) ||
  87                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
  88                 (type1 == NL80211_IFTYPE_AP_VLAN &&
  89                         (type2 == NL80211_IFTYPE_AP ||
  90                          type2 == NL80211_IFTYPE_AP_VLAN));
  91 }
  92
  93 static int ieee80211_open(struct net_device *dev)
  94 {
  95         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
  96         struct ieee80211_sub_if_data *nsdata;
  97         struct ieee80211_local *local = sdata->local;
  98         struct sta_info *sta;
  99         struct ieee80211_if_init_conf conf;
 100         u32 changed = 0;
 101         int res;
 102         u32 hw_reconf_flags = 0;
 103         u8 null_addr[ETH_ALEN] = {0};
 104
 105         /* fail early if user set an invalid address */
 106         if (compare_ether_addr(dev->dev_addr, null_addr) &&
 107             !is_valid_ether_addr(dev->dev_addr))
 108                 return -EADDRNOTAVAIL;
 109
 110         /* we hold the RTNL here so can safely walk the list */
 111         list_for_each_entry(nsdata, &local->interfaces, list) {
 112                 struct net_device *ndev = nsdata->dev;
 113
 114                 if (ndev != dev && ieee80211_sdata_running(nsdata)) {
 115                         /*
 116                          * Allow only a single IBSS interface to be up at any
 117                          * time. This is restricted because beacon distribution
 118                          * cannot work properly if both are in the same IBSS.
 119                          *
 120                          * To remove this restriction we'd have to disallow them
 121                          * from setting the same SSID on different IBSS interfaces
 122                          * belonging to the same hardware. Then, however, we're
 123                          * faced with having to adopt two different TSF timers...
 124                          */
 125                         if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
 126                             nsdata->vif.type == NL80211_IFTYPE_ADHOC)
 127                                 return -EBUSY;
 128
 129                         /*
 130                          * The remaining checks are only performed for interfaces
 131                          * with the same MAC address.
 132                          */
 133                         if (compare_ether_addr(dev->dev_addr, ndev->dev_addr))
 134                                 continue;
 135
 136                         /*
 137                          * check whether it may have the same address
 138                          */
 139                         if (!identical_mac_addr_allowed(sdata->vif.type,
 140                                                         nsdata->vif.type))
 141                                 return -ENOTUNIQ;
 142
 143                         /*
 144                          * can only add VLANs to enabled APs
 145                          */
 146                         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
 147                             nsdata->vif.type == NL80211_IFTYPE_AP)
 148                                 sdata->bss = &nsdata->u.ap;
 149                 }
 150         }
 151
 152         switch (sdata->vif.type) {
 153         case NL80211_IFTYPE_WDS:
 154                 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
 155                         return -ENOLINK;
 156                 break;
 157         case NL80211_IFTYPE_AP_VLAN:
 158                 if (!sdata->bss)
 159                         return -ENOLINK;
 160                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
 161                 break;
 162         case NL80211_IFTYPE_AP:
 163                 sdata->bss = &sdata->u.ap;
 164                 break;
 165         case NL80211_IFTYPE_MESH_POINT:
 166                 if (!ieee80211_vif_is_mesh(&sdata->vif))
 167                         break;
 168                 /* mesh ifaces must set allmulti to forward mcast traffic */
 169                 atomic_inc(&local->iff_allmultis);
 170                 break;
 171         case NL80211_IFTYPE_STATION:
 172         case NL80211_IFTYPE_MONITOR:
 173         case NL80211_IFTYPE_ADHOC:
 174                 /* no special treatment */
 175                 break;
 176         case NL80211_IFTYPE_UNSPECIFIED:
 177         case __NL80211_IFTYPE_AFTER_LAST:
 178                 /* cannot happen */
 179                 WARN_ON(1);
 180                 break;
 181         }
 182
 183         if (local->open_count == 0) {
 184                 res = drv_start(local);
 185                 if (res)
 186                         goto err_del_bss;
 187                 /* we're brought up, everything changes */
 188                 hw_reconf_flags = ~0;
 189                 ieee80211_led_radio(local, true);
 190         }
 191
 192         /*
 193          * Check all interfaces and copy the hopefully now-present
 194          * MAC address to those that have the special null one.
 195          */
 196         list_for_each_entry(nsdata, &local->interfaces, list) {
 197                 struct net_device *ndev = nsdata->dev;
 198
 199                 /*
 200                  * No need to check running since we do not allow
 201                  * it to start up with this invalid address.
 202                  */
 203                 if (compare_ether_addr(null_addr, ndev->dev_addr) == 0) {
 204                         memcpy(ndev->dev_addr,
 205                                local->hw.wiphy->perm_addr,
 206                                ETH_ALEN);
 207                         memcpy(ndev->perm_addr, ndev->dev_addr, ETH_ALEN);
 208                 }
 209         }
 210
 211         /*
 212          * Validate the MAC address for this device.
 213          */
 214         if (!is_valid_ether_addr(dev->dev_addr)) {
 215                 if (!local->open_count)
 216                         drv_stop(local);
 217                 return -EADDRNOTAVAIL;
 218         }
 219
 220         switch (sdata->vif.type) {
 221         case NL80211_IFTYPE_AP_VLAN:
 222                 /* no need to tell driver */
 223                 break;
 224         case NL80211_IFTYPE_MONITOR:
 225                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 226                         local->cooked_mntrs++;
 227                         break;
 228                 }
 229
 230                 /* must be before the call to ieee80211_configure_filter */
 231                 local->monitors++;
 232                 if (local->monitors == 1) {
 233                         local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
 234                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 235                 }
 236
 237                 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
 238                         local->fif_fcsfail++;
 239                 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
 240                         local->fif_plcpfail++;
 241                 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL) {
 242                         local->fif_control++;
 243                         local->fif_pspoll++;
 244                 }
 245                 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
 246                         local->fif_other_bss++;
 247
 248                 ieee80211_configure_filter(local);
 249                 break;
 250         default:
 251                 conf.vif = &sdata->vif;
 252                 conf.type = sdata->vif.type;
 253                 conf.mac_addr = sdata->vif.addr;
 254                 res = drv_add_interface(local, &conf);
 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                 ieee80211_enable_keys(sdata);
 272
 273                 if (sdata->vif.type == NL80211_IFTYPE_STATION)
 274                         netif_carrier_off(dev);
 275                 else
 276                         netif_carrier_on(dev);
 277         }
 278
 279         if (sdata->vif.type == NL80211_IFTYPE_WDS) {
 280                 /* Create STA entry for the WDS peer */
 281                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
 282                                      GFP_KERNEL);
 283                 if (!sta) {
 284                         res = -ENOMEM;
 285                         goto err_del_interface;
 286                 }
 287
 288                 /* no locking required since STA is not live yet */
 289                 sta->flags |= WLAN_STA_AUTHORIZED;
 290
 291                 res = sta_info_insert(sta);
 292                 if (res) {
 293                         /* STA has been freed */
 294                         goto err_del_interface;
 295                 }
 296         }
 297
 298         /*
 299          * set_multicast_list will be invoked by the networking core
 300          * which will check whether any increments here were done in
 301          * error and sync them down to the hardware as filter flags.
 302          */
 303         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 304                 atomic_inc(&local->iff_allmultis);
 305
 306         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 307                 atomic_inc(&local->iff_promiscs);
 308
 309         hw_reconf_flags |= __ieee80211_recalc_idle(local);
 310
 311         local->open_count++;
 312         if (hw_reconf_flags) {
 313                 ieee80211_hw_config(local, hw_reconf_flags);
 314                 /*
 315                  * set default queue parameters so drivers don't
 316                  * need to initialise the hardware if the hardware
 317                  * doesn't start up with sane defaults
 318                  */
 319                 ieee80211_set_wmm_default(sdata);
 320         }
 321
 322         ieee80211_recalc_ps(local, -1);
 323
 324         /*
 325          * ieee80211_sta_work is disabled while network interface
 326          * is down. Therefore, some configuration changes may not
 327          * yet be effective. Trigger execution of ieee80211_sta_work
 328          * to fix this.
 329          */
 330         if (sdata->vif.type == NL80211_IFTYPE_STATION)
 331                 ieee80211_queue_work(&local->hw, &sdata->u.mgd.work);
 332
 333         netif_start_queue(dev);
 334
 335         return 0;
 336  err_del_interface:
 337         drv_remove_interface(local, &conf);
 338  err_stop:
 339         if (!local->open_count)
 340                 drv_stop(local);
 341  err_del_bss:
 342         sdata->bss = NULL;
 343         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
 344                 list_del(&sdata->u.vlan.list);
 345         return res;
 346 }
 347
 348 static int ieee80211_stop(struct net_device *dev)
 349 {
 350         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 351         struct ieee80211_local *local = sdata->local;
 352         struct ieee80211_if_init_conf conf;
 353         struct sta_info *sta;
 354         unsigned long flags;
 355         struct sk_buff *skb, *tmp;
 356         u32 hw_reconf_flags = 0;
 357         int i;
 358
 359         /*
 360          * Stop TX on this interface first.
 361          */
 362         netif_stop_queue(dev);
 363
 364         /*
 365          * Now delete all active aggregation sessions.
 366          */
 367         rcu_read_lock();
 368
 369         list_for_each_entry_rcu(sta, &local->sta_list, list) {
 370                 if (sta->sdata == sdata)
 371                         ieee80211_sta_tear_down_BA_sessions(sta);
 372         }
 373
 374         rcu_read_unlock();
 375
 376         /*
 377          * Remove all stations associated with this interface.
 378          *
 379          * This must be done before calling ops->remove_interface()
 380          * because otherwise we can later invoke ops->sta_notify()
 381          * whenever the STAs are removed, and that invalidates driver
 382          * assumptions about always getting a vif pointer that is valid
 383          * (because if we remove a STA after ops->remove_interface()
 384          * the driver will have removed the vif info already!)
 385          *
 386          * We could relax this and only unlink the stations from the
 387          * hash table and list but keep them on a per-sdata list that
 388          * will be inserted back again when the interface is brought
 389          * up again, but I don't currently see a use case for that,
 390          * except with WDS which gets a STA entry created when it is
 391          * brought up.
 392          */
 393         sta_info_flush(local, sdata);
 394
 395         /*
 396          * Don't count this interface for promisc/allmulti while it
 397          * is down. dev_mc_unsync() will invoke set_multicast_list
 398          * on the master interface which will sync these down to the
 399          * hardware as filter flags.
 400          */
 401         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 402                 atomic_dec(&local->iff_allmultis);
 403
 404         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 405                 atomic_dec(&local->iff_promiscs);
 406
 407         if (sdata->vif.type == NL80211_IFTYPE_AP)
 408                 local->fif_pspoll--;
 409
 410         netif_addr_lock_bh(dev);
 411         spin_lock_bh(&local->filter_lock);
 412         __dev_addr_unsync(&local->mc_list, &local->mc_count,
 413                           &dev->mc_list, &dev->mc_count);
 414         spin_unlock_bh(&local->filter_lock);
 415         netif_addr_unlock_bh(dev);
 416
 417         ieee80211_configure_filter(local);
 418
 419         del_timer_sync(&local->dynamic_ps_timer);
 420         cancel_work_sync(&local->dynamic_ps_enable_work);
 421
 422         /* APs need special treatment */
 423         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 424                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
 425                 struct beacon_data *old_beacon = sdata->u.ap.beacon;
 426
 427                 /* remove beacon */
 428                 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
 429                 synchronize_rcu();
 430                 kfree(old_beacon);
 431
 432                 /* down all dependent devices, that is VLANs */
 433                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
 434                                          u.vlan.list)
 435                         dev_close(vlan->dev);
 436                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
 437         }
 438
 439         local->open_count--;
 440
 441         switch (sdata->vif.type) {
 442         case NL80211_IFTYPE_AP_VLAN:
 443                 list_del(&sdata->u.vlan.list);
 444                 /* no need to tell driver */
 445                 break;
 446         case NL80211_IFTYPE_MONITOR:
 447                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 448                         local->cooked_mntrs--;
 449                         break;
 450                 }
 451
 452                 local->monitors--;
 453                 if (local->monitors == 0) {
 454                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
 455                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 456                 }
 457
 458                 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
 459                         local->fif_fcsfail--;
 460                 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
 461                         local->fif_plcpfail--;
 462                 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL) {
 463                         local->fif_pspoll--;
 464                         local->fif_control--;
 465                 }
 466                 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
 467                         local->fif_other_bss--;
 468
 469                 ieee80211_configure_filter(local);
 470                 break;
 471         case NL80211_IFTYPE_STATION:
 472                 del_timer_sync(&sdata->u.mgd.chswitch_timer);
 473                 del_timer_sync(&sdata->u.mgd.timer);
 474                 del_timer_sync(&sdata->u.mgd.conn_mon_timer);
 475                 del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
 476                 /*
 477                  * If any of the timers fired while we waited for it, it will
 478                  * have queued its work. Now the work will be running again
 479                  * but will not rearm the timer again because it checks
 480                  * whether the interface is running, which, at this point,
 481                  * it no longer is.
 482                  */
 483                 cancel_work_sync(&sdata->u.mgd.work);
 484                 cancel_work_sync(&sdata->u.mgd.chswitch_work);
 485                 cancel_work_sync(&sdata->u.mgd.monitor_work);
 486                 cancel_work_sync(&sdata->u.mgd.beacon_loss_work);
 487
 488                 /*
 489                  * When we get here, the interface is marked down.
 490                  * Call synchronize_rcu() to wait for the RX path
 491                  * should it be using the interface and enqueuing
 492                  * frames at this very time on another CPU.
 493                  */
 494                 synchronize_rcu();
 495                 skb_queue_purge(&sdata->u.mgd.skb_queue);
 496                 /* fall through */
 497         case NL80211_IFTYPE_ADHOC:
 498                 if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 499                         del_timer_sync(&sdata->u.ibss.timer);
 500                         cancel_work_sync(&sdata->u.ibss.work);
 501                         synchronize_rcu();
 502                         skb_queue_purge(&sdata->u.ibss.skb_queue);
 503                 }
 504                 /* fall through */
 505         case NL80211_IFTYPE_MESH_POINT:
 506                 if (ieee80211_vif_is_mesh(&sdata->vif)) {
 507                         /* other_bss and allmulti are always set on mesh
 508                          * ifaces */
 509                         local->fif_other_bss--;
 510                         atomic_dec(&local->iff_allmultis);
 511
 512                         ieee80211_configure_filter(local);
 513
 514                         ieee80211_stop_mesh(sdata);
 515                 }
 516                 /* fall through */
 517         default:
 518                 if (local->scan_sdata == sdata)
 519                         ieee80211_scan_cancel(local);
 520
 521                 /*
 522                  * Disable beaconing for AP and mesh, IBSS can't
 523                  * still be joined to a network at this point.
 524                  */
 525                 if (sdata->vif.type == NL80211_IFTYPE_AP ||
 526                     sdata->vif.type == NL80211_IFTYPE_MESH_POINT) {
 527                         ieee80211_bss_info_change_notify(sdata,
 528                                 BSS_CHANGED_BEACON_ENABLED);
 529                 }
 530
 531                 conf.vif = &sdata->vif;
 532                 conf.type = sdata->vif.type;
 533                 conf.mac_addr = sdata->vif.addr;
 534                 /* disable all keys for as long as this netdev is down */
 535                 ieee80211_disable_keys(sdata);
 536                 drv_remove_interface(local, &conf);
 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 const struct net_device_ops ieee80211_dataif_ops = {
 664         .ndo_open               = ieee80211_open,
 665         .ndo_stop               = ieee80211_stop,
 666         .ndo_uninit             = ieee80211_teardown_sdata,
 667         .ndo_start_xmit         = ieee80211_subif_start_xmit,
 668         .ndo_set_multicast_list = ieee80211_set_multicast_list,
 669         .ndo_change_mtu         = ieee80211_change_mtu,
 670         .ndo_set_mac_address    = ieee80211_change_mac,
 671 };
 672
 673 static const struct net_device_ops ieee80211_monitorif_ops = {
 674         .ndo_open               = ieee80211_open,
 675         .ndo_stop               = ieee80211_stop,
 676         .ndo_uninit             = ieee80211_teardown_sdata,
 677         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
 678         .ndo_set_multicast_list = ieee80211_set_multicast_list,
 679         .ndo_change_mtu         = ieee80211_change_mtu,
 680         .ndo_set_mac_address    = eth_mac_addr,
 681 };
 682
 683 static void ieee80211_if_setup(struct net_device *dev)
 684 {
 685         ether_setup(dev);
 686         dev->netdev_ops = &ieee80211_dataif_ops;
 687         dev->destructor = free_netdev;
 688 }
 689
 690 /*
 691  * Helper function to initialise an interface to a specific type.
 692  */
 693 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
 694                                   enum nl80211_iftype type)
 695 {
 696         /* clear type-dependent union */
 697         memset(&sdata->u, 0, sizeof(sdata->u));
 698
 699         /* and set some type-dependent values */
 700         sdata->vif.type = type;
 701         sdata->dev->netdev_ops = &ieee80211_dataif_ops;
 702         sdata->wdev.iftype = type;
 703
 704         /* only monitor differs */
 705         sdata->dev->type = ARPHRD_ETHER;
 706
 707         switch (type) {
 708         case NL80211_IFTYPE_AP:
 709                 skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
 710                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
 711                 break;
 712         case NL80211_IFTYPE_STATION:
 713                 ieee80211_sta_setup_sdata(sdata);
 714                 break;
 715         case NL80211_IFTYPE_ADHOC:
 716                 ieee80211_ibss_setup_sdata(sdata);
 717                 break;
 718         case NL80211_IFTYPE_MESH_POINT:
 719                 if (ieee80211_vif_is_mesh(&sdata->vif))
 720                         ieee80211_mesh_init_sdata(sdata);
 721                 break;
 722         case NL80211_IFTYPE_MONITOR:
 723                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
 724                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
 725                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
 726                                       MONITOR_FLAG_OTHER_BSS;
 727                 break;
 728         case NL80211_IFTYPE_WDS:
 729         case NL80211_IFTYPE_AP_VLAN:
 730                 break;
 731         case NL80211_IFTYPE_UNSPECIFIED:
 732         case __NL80211_IFTYPE_AFTER_LAST:
 733                 BUG();
 734                 break;
 735         }
 736
 737         ieee80211_debugfs_add_netdev(sdata);
 738 }
 739
 740 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
 741                              enum nl80211_iftype type)
 742 {
 743         ASSERT_RTNL();
 744
 745         if (type == sdata->vif.type)
 746                 return 0;
 747
 748         /* Setting ad-hoc mode on non-IBSS channel is not supported. */
 749         if (sdata->local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS &&
 750             type == NL80211_IFTYPE_ADHOC)
 751                 return -EOPNOTSUPP;
 752
 753         /*
 754          * We could, here, on changes between IBSS/STA/MESH modes,
 755          * invoke an MLME function instead that disassociates etc.
 756          * and goes into the requested mode.
 757          */
 758
 759         if (ieee80211_sdata_running(sdata))
 760                 return -EBUSY;
 761
 762         /* Purge and reset type-dependent state. */
 763         ieee80211_teardown_sdata(sdata->dev);
 764         ieee80211_setup_sdata(sdata, type);
 765
 766         /* reset some values that shouldn't be kept across type changes */
 767         sdata->vif.bss_conf.basic_rates =
 768                 ieee80211_mandatory_rates(sdata->local,
 769                         sdata->local->hw.conf.channel->band);
 770         sdata->drop_unencrypted = 0;
 771         if (type == NL80211_IFTYPE_STATION)
 772                 sdata->u.mgd.use_4addr = false;
 773
 774         return 0;
 775 }
 776
 777 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
 778                      struct net_device **new_dev, enum nl80211_iftype type,
 779                      struct vif_params *params)
 780 {
 781         struct net_device *ndev;
 782         struct ieee80211_sub_if_data *sdata = NULL;
 783         int ret, i;
 784
 785         ASSERT_RTNL();
 786
 787         ndev = alloc_netdev(sizeof(*sdata) + local->hw.vif_data_size,
 788                             name, ieee80211_if_setup);
 789         if (!ndev)
 790                 return -ENOMEM;
 791         dev_net_set(ndev, wiphy_net(local->hw.wiphy));
 792
 793         ndev->needed_headroom = local->tx_headroom +
 794                                 4*6 /* four MAC addresses */
 795                                 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
 796                                 + 6 /* mesh */
 797                                 + 8 /* rfc1042/bridge tunnel */
 798                                 - ETH_HLEN /* ethernet hard_header_len */
 799                                 + IEEE80211_ENCRYPT_HEADROOM;
 800         ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
 801
 802         ret = dev_alloc_name(ndev, ndev->name);
 803         if (ret < 0)
 804                 goto fail;
 805
 806         memcpy(ndev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
 807         memcpy(ndev->perm_addr, ndev->dev_addr, ETH_ALEN);
 808         SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
 809
 810         /* don't use IEEE80211_DEV_TO_SUB_IF because it checks too much */
 811         sdata = netdev_priv(ndev);
 812         ndev->ieee80211_ptr = &sdata->wdev;
 813         memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
 814         memcpy(sdata->name, ndev->name, IFNAMSIZ);
 815
 816         /* initialise type-independent data */
 817         sdata->wdev.wiphy = local->hw.wiphy;
 818         sdata->local = local;
 819         sdata->dev = ndev;
 820
 821         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
 822                 skb_queue_head_init(&sdata->fragments[i].skb_list);
 823
 824         INIT_LIST_HEAD(&sdata->key_list);
 825
 826         sdata->force_unicast_rateidx = -1;
 827         sdata->max_ratectrl_rateidx = -1;
 828
 829         /* setup type-dependent data */
 830         ieee80211_setup_sdata(sdata, type);
 831
 832         if (params) {
 833                 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
 834                 if (type == NL80211_IFTYPE_STATION)
 835                         sdata->u.mgd.use_4addr = params->use_4addr;
 836         }
 837
 838         ret = register_netdevice(ndev);
 839         if (ret)
 840                 goto fail;
 841
 842         if (ieee80211_vif_is_mesh(&sdata->vif) &&
 843             params && params->mesh_id_len)
 844                 ieee80211_sdata_set_mesh_id(sdata,
 845                                             params->mesh_id_len,
 846                                             params->mesh_id);
 847
 848         mutex_lock(&local->iflist_mtx);
 849         list_add_tail_rcu(&sdata->list, &local->interfaces);
 850         mutex_unlock(&local->iflist_mtx);
 851
 852         if (new_dev)
 853                 *new_dev = ndev;
 854
 855         return 0;
 856
 857  fail:
 858         free_netdev(ndev);
 859         return ret;
 860 }
 861
 862 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
 863 {
 864         ASSERT_RTNL();
 865
 866         mutex_lock(&sdata->local->iflist_mtx);
 867         list_del_rcu(&sdata->list);
 868         mutex_unlock(&sdata->local->iflist_mtx);
 869
 870         synchronize_rcu();
 871         unregister_netdevice(sdata->dev);
 872 }
 873
 874 /*
 875  * Remove all interfaces, may only be called at hardware unregistration
 876  * time because it doesn't do RCU-safe list removals.
 877  */
 878 void ieee80211_remove_interfaces(struct ieee80211_local *local)
 879 {
 880         struct ieee80211_sub_if_data *sdata, *tmp;
 881         LIST_HEAD(unreg_list);
 882
 883         ASSERT_RTNL();
 884
 885         mutex_lock(&local->iflist_mtx);
 886         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
 887                 list_del(&sdata->list);
 888
 889                 unregister_netdevice_queue(sdata->dev, &unreg_list);
 890         }
 891         mutex_unlock(&local->iflist_mtx);
 892         unregister_netdevice_many(&unreg_list);
 893 }
 894
 895 static u32 ieee80211_idle_off(struct ieee80211_local *local,
 896                               const char *reason)
 897 {
 898         if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
 899                 return 0;
 900
 901 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 902         printk(KERN_DEBUG "%s: device no longer idle - %s\n",
 903                wiphy_name(local->hw.wiphy), reason);
 904 #endif
 905
 906         local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
 907         return IEEE80211_CONF_CHANGE_IDLE;
 908 }
 909
 910 static u32 ieee80211_idle_on(struct ieee80211_local *local)
 911 {
 912         if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
 913                 return 0;
 914
 915 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 916         printk(KERN_DEBUG "%s: device now idle\n",
 917                wiphy_name(local->hw.wiphy));
 918 #endif
 919
 920         local->hw.conf.flags |= IEEE80211_CONF_IDLE;
 921         return IEEE80211_CONF_CHANGE_IDLE;
 922 }
 923
 924 u32 __ieee80211_recalc_idle(struct ieee80211_local *local)
 925 {
 926         struct ieee80211_sub_if_data *sdata;
 927         int count = 0;
 928
 929         if (local->scanning)
 930                 return ieee80211_idle_off(local, "scanning");
 931
 932         list_for_each_entry(sdata, &local->interfaces, list) {
 933                 if (!ieee80211_sdata_running(sdata))
 934                         continue;
 935                 /* do not count disabled managed interfaces */
 936                 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
 937                     !sdata->u.mgd.associated &&
 938                     list_empty(&sdata->u.mgd.work_list))
 939                         continue;
 940                 /* do not count unused IBSS interfaces */
 941                 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
 942                     !sdata->u.ibss.ssid_len)
 943                         continue;
 944                 /* count everything else */
 945                 count++;
 946         }
 947
 948         if (!count)
 949                 return ieee80211_idle_on(local);
 950         else
 951                 return ieee80211_idle_off(local, "in use");
 952
 953         return 0;
 954 }
 955
 956 void ieee80211_recalc_idle(struct ieee80211_local *local)
 957 {
 958         u32 chg;
 959
 960         mutex_lock(&local->iflist_mtx);
 961         chg = __ieee80211_recalc_idle(local);
 962         mutex_unlock(&local->iflist_mtx);
 963         if (chg)
 964                 ieee80211_hw_config(local, chg);
 965 }
 966
 967 static int netdev_notify(struct notifier_block *nb,
 968                          unsigned long state,
 969                          void *ndev)
 970 {
 971         struct net_device *dev = ndev;
 972         struct ieee80211_sub_if_data *sdata;
 973
 974         if (state != NETDEV_CHANGENAME)
 975                 return 0;
 976
 977         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
 978                 return 0;
 979
 980         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
 981                 return 0;
 982
 983         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 984
 985         memcpy(sdata->name, sdata->name, IFNAMSIZ);
 986
 987         ieee80211_debugfs_rename_netdev(sdata);
 988         return 0;
 989 }
 990
 991 static struct notifier_block mac80211_netdev_notifier = {
 992         .notifier_call = netdev_notify,
 993 };
 994
 995 int ieee80211_iface_init(void)
 996 {
 997         return register_netdevice_notifier(&mac80211_netdev_notifier);
 998 }
 999
1000 void ieee80211_iface_exit(void)
1001 {
1002         unregister_netdevice_notifier(&mac80211_netdev_notifier);
1003 }