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          * Purge work for this interface.
 366          */
 367         ieee80211_work_purge(sdata);
 368
 369         /*
 370          * Now delete all active aggregation sessions.
 371          */
 372         rcu_read_lock();
 373
 374         list_for_each_entry_rcu(sta, &local->sta_list, list) {
 375                 if (sta->sdata == sdata)
 376                         ieee80211_sta_tear_down_BA_sessions(sta);
 377         }
 378
 379         rcu_read_unlock();
 380
 381         /*
 382          * Remove all stations associated with this interface.
 383          *
 384          * This must be done before calling ops->remove_interface()
 385          * because otherwise we can later invoke ops->sta_notify()
 386          * whenever the STAs are removed, and that invalidates driver
 387          * assumptions about always getting a vif pointer that is valid
 388          * (because if we remove a STA after ops->remove_interface()
 389          * the driver will have removed the vif info already!)
 390          *
 391          * We could relax this and only unlink the stations from the
 392          * hash table and list but keep them on a per-sdata list that
 393          * will be inserted back again when the interface is brought
 394          * up again, but I don't currently see a use case for that,
 395          * except with WDS which gets a STA entry created when it is
 396          * brought up.
 397          */
 398         sta_info_flush(local, sdata);
 399
 400         /*
 401          * Don't count this interface for promisc/allmulti while it
 402          * is down. dev_mc_unsync() will invoke set_multicast_list
 403          * on the master interface which will sync these down to the
 404          * hardware as filter flags.
 405          */
 406         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 407                 atomic_dec(&local->iff_allmultis);
 408
 409         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 410                 atomic_dec(&local->iff_promiscs);
 411
 412         if (sdata->vif.type == NL80211_IFTYPE_AP)
 413                 local->fif_pspoll--;
 414
 415         netif_addr_lock_bh(dev);
 416         spin_lock_bh(&local->filter_lock);
 417         __dev_addr_unsync(&local->mc_list, &local->mc_count,
 418                           &dev->mc_list, &dev->mc_count);
 419         spin_unlock_bh(&local->filter_lock);
 420         netif_addr_unlock_bh(dev);
 421
 422         ieee80211_configure_filter(local);
 423
 424         del_timer_sync(&local->dynamic_ps_timer);
 425         cancel_work_sync(&local->dynamic_ps_enable_work);
 426
 427         /* APs need special treatment */
 428         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 429                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
 430                 struct beacon_data *old_beacon = sdata->u.ap.beacon;
 431
 432                 /* remove beacon */
 433                 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
 434                 synchronize_rcu();
 435                 kfree(old_beacon);
 436
 437                 /* down all dependent devices, that is VLANs */
 438                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
 439                                          u.vlan.list)
 440                         dev_close(vlan->dev);
 441                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
 442         }
 443
 444         local->open_count--;
 445
 446         switch (sdata->vif.type) {
 447         case NL80211_IFTYPE_AP_VLAN:
 448                 list_del(&sdata->u.vlan.list);
 449                 /* no need to tell driver */
 450                 break;
 451         case NL80211_IFTYPE_MONITOR:
 452                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 453                         local->cooked_mntrs--;
 454                         break;
 455                 }
 456
 457                 local->monitors--;
 458                 if (local->monitors == 0) {
 459                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
 460                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 461                 }
 462
 463                 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
 464                         local->fif_fcsfail--;
 465                 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
 466                         local->fif_plcpfail--;
 467                 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL) {
 468                         local->fif_pspoll--;
 469                         local->fif_control--;
 470                 }
 471                 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
 472                         local->fif_other_bss--;
 473
 474                 ieee80211_configure_filter(local);
 475                 break;
 476         case NL80211_IFTYPE_STATION:
 477                 del_timer_sync(&sdata->u.mgd.chswitch_timer);
 478                 del_timer_sync(&sdata->u.mgd.timer);
 479                 del_timer_sync(&sdata->u.mgd.conn_mon_timer);
 480                 del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
 481                 /*
 482                  * If any of the timers fired while we waited for it, it will
 483                  * have queued its work. Now the work will be running again
 484                  * but will not rearm the timer again because it checks
 485                  * whether the interface is running, which, at this point,
 486                  * it no longer is.
 487                  */
 488                 cancel_work_sync(&sdata->u.mgd.work);
 489                 cancel_work_sync(&sdata->u.mgd.chswitch_work);
 490                 cancel_work_sync(&sdata->u.mgd.monitor_work);
 491                 cancel_work_sync(&sdata->u.mgd.beacon_loss_work);
 492
 493                 /*
 494                  * When we get here, the interface is marked down.
 495                  * Call synchronize_rcu() to wait for the RX path
 496                  * should it be using the interface and enqueuing
 497                  * frames at this very time on another CPU.
 498                  */
 499                 synchronize_rcu();
 500                 skb_queue_purge(&sdata->u.mgd.skb_queue);
 501                 /* fall through */
 502         case NL80211_IFTYPE_ADHOC:
 503                 if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 504                         del_timer_sync(&sdata->u.ibss.timer);
 505                         cancel_work_sync(&sdata->u.ibss.work);
 506                         synchronize_rcu();
 507                         skb_queue_purge(&sdata->u.ibss.skb_queue);
 508                 }
 509                 /* fall through */
 510         case NL80211_IFTYPE_MESH_POINT:
 511                 if (ieee80211_vif_is_mesh(&sdata->vif)) {
 512                         /* other_bss and allmulti are always set on mesh
 513                          * ifaces */
 514                         local->fif_other_bss--;
 515                         atomic_dec(&local->iff_allmultis);
 516
 517                         ieee80211_configure_filter(local);
 518
 519                         ieee80211_stop_mesh(sdata);
 520                 }
 521                 /* fall through */
 522         default:
 523                 if (local->scan_sdata == sdata)
 524                         ieee80211_scan_cancel(local);
 525
 526                 /*
 527                  * Disable beaconing for AP and mesh, IBSS can't
 528                  * still be joined to a network at this point.
 529                  */
 530                 if (sdata->vif.type == NL80211_IFTYPE_AP ||
 531                     sdata->vif.type == NL80211_IFTYPE_MESH_POINT) {
 532                         ieee80211_bss_info_change_notify(sdata,
 533                                 BSS_CHANGED_BEACON_ENABLED);
 534                 }
 535
 536                 conf.vif = &sdata->vif;
 537                 conf.type = sdata->vif.type;
 538                 conf.mac_addr = sdata->vif.addr;
 539                 /* disable all keys for as long as this netdev is down */
 540                 ieee80211_disable_keys(sdata);
 541                 drv_remove_interface(local, &conf);
 542         }
 543
 544         sdata->bss = NULL;
 545
 546         hw_reconf_flags |= __ieee80211_recalc_idle(local);
 547
 548         ieee80211_recalc_ps(local, -1);
 549
 550         if (local->open_count == 0) {
 551                 ieee80211_clear_tx_pending(local);
 552                 ieee80211_stop_device(local);
 553
 554                 /* no reconfiguring after stop! */
 555                 hw_reconf_flags = 0;
 556         }
 557
 558         /* do after stop to avoid reconfiguring when we stop anyway */
 559         if (hw_reconf_flags)
 560                 ieee80211_hw_config(local, hw_reconf_flags);
 561
 562         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 563         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 564                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
 565                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 566                         if (info->control.vif == &sdata->vif) {
 567                                 __skb_unlink(skb, &local->pending[i]);
 568                                 dev_kfree_skb_irq(skb);
 569                         }
 570                 }
 571         }
 572         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 573
 574         return 0;
 575 }
 576
 577 static void ieee80211_set_multicast_list(struct net_device *dev)
 578 {
 579         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 580         struct ieee80211_local *local = sdata->local;
 581         int allmulti, promisc, sdata_allmulti, sdata_promisc;
 582
 583         allmulti = !!(dev->flags & IFF_ALLMULTI);
 584         promisc = !!(dev->flags & IFF_PROMISC);
 585         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
 586         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
 587
 588         if (allmulti != sdata_allmulti) {
 589                 if (dev->flags & IFF_ALLMULTI)
 590                         atomic_inc(&local->iff_allmultis);
 591                 else
 592                         atomic_dec(&local->iff_allmultis);
 593                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
 594         }
 595
 596         if (promisc != sdata_promisc) {
 597                 if (dev->flags & IFF_PROMISC)
 598                         atomic_inc(&local->iff_promiscs);
 599                 else
 600                         atomic_dec(&local->iff_promiscs);
 601                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
 602         }
 603         spin_lock_bh(&local->filter_lock);
 604         __dev_addr_sync(&local->mc_list, &local->mc_count,
 605                         &dev->mc_list, &dev->mc_count);
 606         spin_unlock_bh(&local->filter_lock);
 607         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
 608 }
 609
 610 /*
 611  * Called when the netdev is removed or, by the code below, before
 612  * the interface type changes.
 613  */
 614 static void ieee80211_teardown_sdata(struct net_device *dev)
 615 {
 616         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 617         struct ieee80211_local *local = sdata->local;
 618         struct beacon_data *beacon;
 619         struct sk_buff *skb;
 620         int flushed;
 621         int i;
 622
 623         /* free extra data */
 624         ieee80211_free_keys(sdata);
 625
 626         ieee80211_debugfs_remove_netdev(sdata);
 627
 628         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
 629                 __skb_queue_purge(&sdata->fragments[i].skb_list);
 630         sdata->fragment_next = 0;
 631
 632         switch (sdata->vif.type) {
 633         case NL80211_IFTYPE_AP:
 634                 beacon = sdata->u.ap.beacon;
 635                 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
 636                 synchronize_rcu();
 637                 kfree(beacon);
 638
 639                 while ((skb = skb_dequeue(&sdata->u.ap.ps_bc_buf))) {
 640                         local->total_ps_buffered--;
 641                         dev_kfree_skb(skb);
 642                 }
 643
 644                 break;
 645         case NL80211_IFTYPE_MESH_POINT:
 646                 if (ieee80211_vif_is_mesh(&sdata->vif))
 647                         mesh_rmc_free(sdata);
 648                 break;
 649         case NL80211_IFTYPE_ADHOC:
 650                 if (WARN_ON(sdata->u.ibss.presp))
 651                         kfree_skb(sdata->u.ibss.presp);
 652                 break;
 653         case NL80211_IFTYPE_STATION:
 654         case NL80211_IFTYPE_WDS:
 655         case NL80211_IFTYPE_AP_VLAN:
 656         case NL80211_IFTYPE_MONITOR:
 657                 break;
 658         case NL80211_IFTYPE_UNSPECIFIED:
 659         case __NL80211_IFTYPE_AFTER_LAST:
 660                 BUG();
 661                 break;
 662         }
 663
 664         flushed = sta_info_flush(local, sdata);
 665         WARN_ON(flushed);
 666 }
 667
 668 static const struct net_device_ops ieee80211_dataif_ops = {
 669         .ndo_open               = ieee80211_open,
 670         .ndo_stop               = ieee80211_stop,
 671         .ndo_uninit             = ieee80211_teardown_sdata,
 672         .ndo_start_xmit         = ieee80211_subif_start_xmit,
 673         .ndo_set_multicast_list = ieee80211_set_multicast_list,
 674         .ndo_change_mtu         = ieee80211_change_mtu,
 675         .ndo_set_mac_address    = ieee80211_change_mac,
 676 };
 677
 678 static const struct net_device_ops ieee80211_monitorif_ops = {
 679         .ndo_open               = ieee80211_open,
 680         .ndo_stop               = ieee80211_stop,
 681         .ndo_uninit             = ieee80211_teardown_sdata,
 682         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
 683         .ndo_set_multicast_list = ieee80211_set_multicast_list,
 684         .ndo_change_mtu         = ieee80211_change_mtu,
 685         .ndo_set_mac_address    = eth_mac_addr,
 686 };
 687
 688 static void ieee80211_if_setup(struct net_device *dev)
 689 {
 690         ether_setup(dev);
 691         dev->netdev_ops = &ieee80211_dataif_ops;
 692         dev->destructor = free_netdev;
 693 }
 694
 695 /*
 696  * Helper function to initialise an interface to a specific type.
 697  */
 698 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
 699                                   enum nl80211_iftype type)
 700 {
 701         /* clear type-dependent union */
 702         memset(&sdata->u, 0, sizeof(sdata->u));
 703
 704         /* and set some type-dependent values */
 705         sdata->vif.type = type;
 706         sdata->dev->netdev_ops = &ieee80211_dataif_ops;
 707         sdata->wdev.iftype = type;
 708
 709         /* only monitor differs */
 710         sdata->dev->type = ARPHRD_ETHER;
 711
 712         switch (type) {
 713         case NL80211_IFTYPE_AP:
 714                 skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
 715                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
 716                 break;
 717         case NL80211_IFTYPE_STATION:
 718                 ieee80211_sta_setup_sdata(sdata);
 719                 break;
 720         case NL80211_IFTYPE_ADHOC:
 721                 ieee80211_ibss_setup_sdata(sdata);
 722                 break;
 723         case NL80211_IFTYPE_MESH_POINT:
 724                 if (ieee80211_vif_is_mesh(&sdata->vif))
 725                         ieee80211_mesh_init_sdata(sdata);
 726                 break;
 727         case NL80211_IFTYPE_MONITOR:
 728                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
 729                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
 730                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
 731                                       MONITOR_FLAG_OTHER_BSS;
 732                 break;
 733         case NL80211_IFTYPE_WDS:
 734         case NL80211_IFTYPE_AP_VLAN:
 735                 break;
 736         case NL80211_IFTYPE_UNSPECIFIED:
 737         case __NL80211_IFTYPE_AFTER_LAST:
 738                 BUG();
 739                 break;
 740         }
 741
 742         ieee80211_debugfs_add_netdev(sdata);
 743 }
 744
 745 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
 746                              enum nl80211_iftype type)
 747 {
 748         ASSERT_RTNL();
 749
 750         if (type == sdata->vif.type)
 751                 return 0;
 752
 753         /* Setting ad-hoc mode on non-IBSS channel is not supported. */
 754         if (sdata->local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS &&
 755             type == NL80211_IFTYPE_ADHOC)
 756                 return -EOPNOTSUPP;
 757
 758         /*
 759          * We could, here, on changes between IBSS/STA/MESH modes,
 760          * invoke an MLME function instead that disassociates etc.
 761          * and goes into the requested mode.
 762          */
 763
 764         if (ieee80211_sdata_running(sdata))
 765                 return -EBUSY;
 766
 767         /* Purge and reset type-dependent state. */
 768         ieee80211_teardown_sdata(sdata->dev);
 769         ieee80211_setup_sdata(sdata, type);
 770
 771         /* reset some values that shouldn't be kept across type changes */
 772         sdata->vif.bss_conf.basic_rates =
 773                 ieee80211_mandatory_rates(sdata->local,
 774                         sdata->local->hw.conf.channel->band);
 775         sdata->drop_unencrypted = 0;
 776         if (type == NL80211_IFTYPE_STATION)
 777                 sdata->u.mgd.use_4addr = false;
 778
 779         return 0;
 780 }
 781
 782 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
 783                      struct net_device **new_dev, enum nl80211_iftype type,
 784                      struct vif_params *params)
 785 {
 786         struct net_device *ndev;
 787         struct ieee80211_sub_if_data *sdata = NULL;
 788         int ret, i;
 789
 790         ASSERT_RTNL();
 791
 792         ndev = alloc_netdev(sizeof(*sdata) + local->hw.vif_data_size,
 793                             name, ieee80211_if_setup);
 794         if (!ndev)
 795                 return -ENOMEM;
 796         dev_net_set(ndev, wiphy_net(local->hw.wiphy));
 797
 798         ndev->needed_headroom = local->tx_headroom +
 799                                 4*6 /* four MAC addresses */
 800                                 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
 801                                 + 6 /* mesh */
 802                                 + 8 /* rfc1042/bridge tunnel */
 803                                 - ETH_HLEN /* ethernet hard_header_len */
 804                                 + IEEE80211_ENCRYPT_HEADROOM;
 805         ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
 806
 807         ret = dev_alloc_name(ndev, ndev->name);
 808         if (ret < 0)
 809                 goto fail;
 810
 811         memcpy(ndev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
 812         memcpy(ndev->perm_addr, ndev->dev_addr, ETH_ALEN);
 813         SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
 814
 815         /* don't use IEEE80211_DEV_TO_SUB_IF because it checks too much */
 816         sdata = netdev_priv(ndev);
 817         ndev->ieee80211_ptr = &sdata->wdev;
 818         memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
 819         memcpy(sdata->name, ndev->name, IFNAMSIZ);
 820
 821         /* initialise type-independent data */
 822         sdata->wdev.wiphy = local->hw.wiphy;
 823         sdata->local = local;
 824         sdata->dev = ndev;
 825
 826         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
 827                 skb_queue_head_init(&sdata->fragments[i].skb_list);
 828
 829         INIT_LIST_HEAD(&sdata->key_list);
 830
 831         sdata->force_unicast_rateidx = -1;
 832         sdata->max_ratectrl_rateidx = -1;
 833
 834         /* setup type-dependent data */
 835         ieee80211_setup_sdata(sdata, type);
 836
 837         if (params) {
 838                 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
 839                 if (type == NL80211_IFTYPE_STATION)
 840                         sdata->u.mgd.use_4addr = params->use_4addr;
 841         }
 842
 843         ret = register_netdevice(ndev);
 844         if (ret)
 845                 goto fail;
 846
 847         if (ieee80211_vif_is_mesh(&sdata->vif) &&
 848             params && params->mesh_id_len)
 849                 ieee80211_sdata_set_mesh_id(sdata,
 850                                             params->mesh_id_len,
 851                                             params->mesh_id);
 852
 853         mutex_lock(&local->iflist_mtx);
 854         list_add_tail_rcu(&sdata->list, &local->interfaces);
 855         mutex_unlock(&local->iflist_mtx);
 856
 857         if (new_dev)
 858                 *new_dev = ndev;
 859
 860         return 0;
 861
 862  fail:
 863         free_netdev(ndev);
 864         return ret;
 865 }
 866
 867 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
 868 {
 869         ASSERT_RTNL();
 870
 871         mutex_lock(&sdata->local->iflist_mtx);
 872         list_del_rcu(&sdata->list);
 873         mutex_unlock(&sdata->local->iflist_mtx);
 874
 875         synchronize_rcu();
 876         unregister_netdevice(sdata->dev);
 877 }
 878
 879 /*
 880  * Remove all interfaces, may only be called at hardware unregistration
 881  * time because it doesn't do RCU-safe list removals.
 882  */
 883 void ieee80211_remove_interfaces(struct ieee80211_local *local)
 884 {
 885         struct ieee80211_sub_if_data *sdata, *tmp;
 886         LIST_HEAD(unreg_list);
 887
 888         ASSERT_RTNL();
 889
 890         mutex_lock(&local->iflist_mtx);
 891         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
 892                 list_del(&sdata->list);
 893
 894                 unregister_netdevice_queue(sdata->dev, &unreg_list);
 895         }
 896         mutex_unlock(&local->iflist_mtx);
 897         unregister_netdevice_many(&unreg_list);
 898 }
 899
 900 static u32 ieee80211_idle_off(struct ieee80211_local *local,
 901                               const char *reason)
 902 {
 903         if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
 904                 return 0;
 905
 906 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 907         printk(KERN_DEBUG "%s: device no longer idle - %s\n",
 908                wiphy_name(local->hw.wiphy), reason);
 909 #endif
 910
 911         local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
 912         return IEEE80211_CONF_CHANGE_IDLE;
 913 }
 914
 915 static u32 ieee80211_idle_on(struct ieee80211_local *local)
 916 {
 917         if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
 918                 return 0;
 919
 920 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 921         printk(KERN_DEBUG "%s: device now idle\n",
 922                wiphy_name(local->hw.wiphy));
 923 #endif
 924
 925         drv_flush(local, false);
 926
 927         local->hw.conf.flags |= IEEE80211_CONF_IDLE;
 928         return IEEE80211_CONF_CHANGE_IDLE;
 929 }
 930
 931 u32 __ieee80211_recalc_idle(struct ieee80211_local *local)
 932 {
 933         struct ieee80211_sub_if_data *sdata;
 934         int count = 0;
 935
 936         if (!list_empty(&local->work_list))
 937                 return ieee80211_idle_off(local, "working");
 938
 939         if (local->scanning)
 940                 return ieee80211_idle_off(local, "scanning");
 941
 942         list_for_each_entry(sdata, &local->interfaces, list) {
 943                 if (!ieee80211_sdata_running(sdata))
 944                         continue;
 945                 /* do not count disabled managed interfaces */
 946                 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
 947                     !sdata->u.mgd.associated)
 948                         continue;
 949                 /* do not count unused IBSS interfaces */
 950                 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
 951                     !sdata->u.ibss.ssid_len)
 952                         continue;
 953                 /* count everything else */
 954                 count++;
 955         }
 956
 957         if (!count)
 958                 return ieee80211_idle_on(local);
 959         else
 960                 return ieee80211_idle_off(local, "in use");
 961
 962         return 0;
 963 }
 964
 965 void ieee80211_recalc_idle(struct ieee80211_local *local)
 966 {
 967         u32 chg;
 968
 969         mutex_lock(&local->iflist_mtx);
 970         chg = __ieee80211_recalc_idle(local);
 971         mutex_unlock(&local->iflist_mtx);
 972         if (chg)
 973                 ieee80211_hw_config(local, chg);
 974 }
 975
 976 static int netdev_notify(struct notifier_block *nb,
 977                          unsigned long state,
 978                          void *ndev)
 979 {
 980         struct net_device *dev = ndev;
 981         struct ieee80211_sub_if_data *sdata;
 982
 983         if (state != NETDEV_CHANGENAME)
 984                 return 0;
 985
 986         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
 987                 return 0;
 988
 989         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
 990                 return 0;
 991
 992         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 993
 994         memcpy(sdata->name, sdata->name, IFNAMSIZ);
 995
 996         ieee80211_debugfs_rename_netdev(sdata);
 997         return 0;
 998 }
 999
1000 static struct notifier_block mac80211_netdev_notifier = {
1001         .notifier_call = netdev_notify,
1002 };
1003
1004 int ieee80211_iface_init(void)
1005 {
1006         return register_netdevice_notifier(&mac80211_netdev_notifier);
1007 }
1008
1009 void ieee80211_iface_exit(void)
1010 {
1011         unregister_netdevice_notifier(&mac80211_netdev_notifier);
1012 }