net/mac80211/iface.c

   1 /*
   2  * Interface handling (except master interface)
   3  *
   4  * Copyright 2002-2005, Instant802 Networks, Inc.
   5  * Copyright 2005-2006, Devicescape Software, Inc.
   6  * Copyright (c) 2006 Jiri Benc <jbenc@suse.cz>
   7  * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13 #include <linux/slab.h>
  14 #include <linux/kernel.h>
  15 #include <linux/if_arp.h>
  16 #include <linux/netdevice.h>
  17 #include <linux/rtnetlink.h>
  18 #include <net/mac80211.h>
  19 #include <net/ieee80211_radiotap.h>
  20 #include "ieee80211_i.h"
  21 #include "sta_info.h"
  22 #include "debugfs_netdev.h"
  23 #include "mesh.h"
  24 #include "led.h"
  25 #include "driver-ops.h"
  26 #include "wme.h"
  27 #include "rate.h"
  28
  29 /**
  30  * DOC: Interface list locking
  31  *
  32  * The interface list in each struct ieee80211_local is protected
  33  * three-fold:
  34  *
  35  * (1) modifications may only be done under the RTNL
  36  * (2) modifications and readers are protected against each other by
  37  *     the iflist_mtx.
  38  * (3) modifications are done in an RCU manner so atomic readers
  39  *     can traverse the list in RCU-safe blocks.
  40  *
  41  * As a consequence, reads (traversals) of the list can be protected
  42  * by either the RTNL, the iflist_mtx or RCU.
  43  */
  44
  45
  46 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
  47 {
  48         int meshhdrlen;
  49         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
  50
  51         meshhdrlen = (sdata->vif.type == NL80211_IFTYPE_MESH_POINT) ? 5 : 0;
  52
  53         /* FIX: what would be proper limits for MTU?
  54          * This interface uses 802.3 frames. */
  55         if (new_mtu < 256 ||
  56             new_mtu > IEEE80211_MAX_DATA_LEN - 24 - 6 - meshhdrlen) {
  57                 return -EINVAL;
  58         }
  59
  60 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
  61         printk(KERN_DEBUG "%s: setting MTU %d\n", dev->name, new_mtu);
  62 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
  63         dev->mtu = new_mtu;
  64         return 0;
  65 }
  66
  67 static int ieee80211_change_mac(struct net_device *dev, void *addr)
  68 {
  69         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
  70         struct sockaddr *sa = addr;
  71         int ret;
  72
  73         if (ieee80211_sdata_running(sdata))
  74                 return -EBUSY;
  75
  76         ret = eth_mac_addr(dev, sa);
  77
  78         if (ret == 0)
  79                 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
  80
  81         return ret;
  82 }
  83
  84 static inline int identical_mac_addr_allowed(int type1, int type2)
  85 {
  86         return type1 == NL80211_IFTYPE_MONITOR ||
  87                 type2 == NL80211_IFTYPE_MONITOR ||
  88                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
  89                 (type1 == NL80211_IFTYPE_WDS &&
  90                         (type2 == NL80211_IFTYPE_WDS ||
  91                          type2 == NL80211_IFTYPE_AP)) ||
  92                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
  93                 (type1 == NL80211_IFTYPE_AP_VLAN &&
  94                         (type2 == NL80211_IFTYPE_AP ||
  95                          type2 == NL80211_IFTYPE_AP_VLAN));
  96 }
  97
  98 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
  99                                             enum nl80211_iftype iftype)
 100 {
 101         struct ieee80211_local *local = sdata->local;
 102         struct ieee80211_sub_if_data *nsdata;
 103         struct net_device *dev = sdata->dev;
 104
 105         ASSERT_RTNL();
 106
 107         /* we hold the RTNL here so can safely walk the list */
 108         list_for_each_entry(nsdata, &local->interfaces, list) {
 109                 struct net_device *ndev = nsdata->dev;
 110
 111                 if (ndev != dev && ieee80211_sdata_running(nsdata)) {
 112                         /*
 113                          * Allow only a single IBSS interface to be up at any
 114                          * time. This is restricted because beacon distribution
 115                          * cannot work properly if both are in the same IBSS.
 116                          *
 117                          * To remove this restriction we'd have to disallow them
 118                          * from setting the same SSID on different IBSS interfaces
 119                          * belonging to the same hardware. Then, however, we're
 120                          * faced with having to adopt two different TSF timers...
 121                          */
 122                         if (iftype == NL80211_IFTYPE_ADHOC &&
 123                             nsdata->vif.type == NL80211_IFTYPE_ADHOC)
 124                                 return -EBUSY;
 125
 126                         /*
 127                          * The remaining checks are only performed for interfaces
 128                          * with the same MAC address.
 129                          */
 130                         if (compare_ether_addr(dev->dev_addr, ndev->dev_addr))
 131                                 continue;
 132
 133                         /*
 134                          * check whether it may have the same address
 135                          */
 136                         if (!identical_mac_addr_allowed(iftype,
 137                                                         nsdata->vif.type))
 138                                 return -ENOTUNIQ;
 139
 140                         /*
 141                          * can only add VLANs to enabled APs
 142                          */
 143                         if (iftype == NL80211_IFTYPE_AP_VLAN &&
 144                             nsdata->vif.type == NL80211_IFTYPE_AP)
 145                                 sdata->bss = &nsdata->u.ap;
 146                 }
 147         }
 148
 149         return 0;
 150 }
 151
 152 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
 153                                     const int offset)
 154 {
 155         struct ieee80211_local *local = sdata->local;
 156         u32 flags = sdata->u.mntr_flags;
 157
 158 #define ADJUST(_f, _s)  do {                                    \
 159         if (flags & MONITOR_FLAG_##_f)                          \
 160                 local->fif_##_s += offset;                      \
 161         } while (0)
 162
 163         ADJUST(FCSFAIL, fcsfail);
 164         ADJUST(PLCPFAIL, plcpfail);
 165         ADJUST(CONTROL, control);
 166         ADJUST(CONTROL, pspoll);
 167         ADJUST(OTHER_BSS, other_bss);
 168
 169 #undef ADJUST
 170 }
 171
 172 /*
 173  * NOTE: Be very careful when changing this function, it must NOT return
 174  * an error on interface type changes that have been pre-checked, so most
 175  * checks should be in ieee80211_check_concurrent_iface.
 176  */
 177 static int ieee80211_do_open(struct net_device *dev, bool coming_up)
 178 {
 179         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 180         struct ieee80211_local *local = sdata->local;
 181         struct sta_info *sta;
 182         u32 changed = 0;
 183         int res;
 184         u32 hw_reconf_flags = 0;
 185
 186         switch (sdata->vif.type) {
 187         case NL80211_IFTYPE_WDS:
 188                 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
 189                         return -ENOLINK;
 190                 break;
 191         case NL80211_IFTYPE_AP_VLAN:
 192                 if (!sdata->bss)
 193                         return -ENOLINK;
 194                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
 195                 break;
 196         case NL80211_IFTYPE_AP:
 197                 sdata->bss = &sdata->u.ap;
 198                 break;
 199         case NL80211_IFTYPE_MESH_POINT:
 200         case NL80211_IFTYPE_STATION:
 201         case NL80211_IFTYPE_MONITOR:
 202         case NL80211_IFTYPE_ADHOC:
 203                 /* no special treatment */
 204                 break;
 205         case NL80211_IFTYPE_UNSPECIFIED:
 206         case NUM_NL80211_IFTYPES:
 207         case NL80211_IFTYPE_P2P_CLIENT:
 208         case NL80211_IFTYPE_P2P_GO:
 209                 /* cannot happen */
 210                 WARN_ON(1);
 211                 break;
 212         }
 213
 214         if (local->open_count == 0) {
 215                 res = drv_start(local);
 216                 if (res)
 217                         goto err_del_bss;
 218                 if (local->ops->napi_poll)
 219                         napi_enable(&local->napi);
 220                 /* we're brought up, everything changes */
 221                 hw_reconf_flags = ~0;
 222                 ieee80211_led_radio(local, true);
 223                 ieee80211_mod_tpt_led_trig(local,
 224                                            IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
 225         }
 226
 227         /*
 228          * Copy the hopefully now-present MAC address to
 229          * this interface, if it has the special null one.
 230          */
 231         if (is_zero_ether_addr(dev->dev_addr)) {
 232                 memcpy(dev->dev_addr,
 233                        local->hw.wiphy->perm_addr,
 234                        ETH_ALEN);
 235                 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
 236
 237                 if (!is_valid_ether_addr(dev->dev_addr)) {
 238                         if (!local->open_count)
 239                                 drv_stop(local);
 240                         return -EADDRNOTAVAIL;
 241                 }
 242         }
 243
 244         switch (sdata->vif.type) {
 245         case NL80211_IFTYPE_AP_VLAN:
 246                 /* no need to tell driver */
 247                 break;
 248         case NL80211_IFTYPE_MONITOR:
 249                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 250                         local->cooked_mntrs++;
 251                         break;
 252                 }
 253
 254                 /* must be before the call to ieee80211_configure_filter */
 255                 local->monitors++;
 256                 if (local->monitors == 1) {
 257                         local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
 258                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 259                 }
 260
 261                 ieee80211_adjust_monitor_flags(sdata, 1);
 262                 ieee80211_configure_filter(local);
 263
 264                 netif_carrier_on(dev);
 265                 break;
 266         default:
 267                 if (coming_up) {
 268                         res = drv_add_interface(local, &sdata->vif);
 269                         if (res)
 270                                 goto err_stop;
 271                 }
 272
 273                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
 274                         local->fif_pspoll++;
 275                         local->fif_probe_req++;
 276
 277                         ieee80211_configure_filter(local);
 278                 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 279                         local->fif_probe_req++;
 280                 }
 281
 282                 changed |= ieee80211_reset_erp_info(sdata);
 283                 ieee80211_bss_info_change_notify(sdata, changed);
 284
 285                 if (sdata->vif.type == NL80211_IFTYPE_STATION)
 286                         netif_carrier_off(dev);
 287                 else
 288                         netif_carrier_on(dev);
 289         }
 290
 291         set_bit(SDATA_STATE_RUNNING, &sdata->state);
 292
 293         if (sdata->vif.type == NL80211_IFTYPE_WDS) {
 294                 /* Create STA entry for the WDS peer */
 295                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
 296                                      GFP_KERNEL);
 297                 if (!sta) {
 298                         res = -ENOMEM;
 299                         goto err_del_interface;
 300                 }
 301
 302                 /* no atomic bitop required since STA is not live yet */
 303                 set_sta_flag(sta, WLAN_STA_AUTHORIZED);
 304
 305                 res = sta_info_insert(sta);
 306                 if (res) {
 307                         /* STA has been freed */
 308                         goto err_del_interface;
 309                 }
 310
 311                 rate_control_rate_init(sta);
 312         }
 313
 314         /*
 315          * set_multicast_list will be invoked by the networking core
 316          * which will check whether any increments here were done in
 317          * error and sync them down to the hardware as filter flags.
 318          */
 319         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 320                 atomic_inc(&local->iff_allmultis);
 321
 322         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 323                 atomic_inc(&local->iff_promiscs);
 324
 325         mutex_lock(&local->mtx);
 326         hw_reconf_flags |= __ieee80211_recalc_idle(local);
 327         mutex_unlock(&local->mtx);
 328
 329         if (coming_up)
 330                 local->open_count++;
 331
 332         if (hw_reconf_flags) {
 333                 ieee80211_hw_config(local, hw_reconf_flags);
 334                 /*
 335                  * set default queue parameters so drivers don't
 336                  * need to initialise the hardware if the hardware
 337                  * doesn't start up with sane defaults
 338                  */
 339                 ieee80211_set_wmm_default(sdata);
 340         }
 341
 342         ieee80211_recalc_ps(local, -1);
 343
 344         netif_tx_start_all_queues(dev);
 345
 346         return 0;
 347  err_del_interface:
 348         drv_remove_interface(local, &sdata->vif);
 349  err_stop:
 350         if (!local->open_count)
 351                 drv_stop(local);
 352  err_del_bss:
 353         sdata->bss = NULL;
 354         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
 355                 list_del(&sdata->u.vlan.list);
 356         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 357         return res;
 358 }
 359
 360 static int ieee80211_open(struct net_device *dev)
 361 {
 362         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 363         int err;
 364
 365         /* fail early if user set an invalid address */
 366         if (!is_valid_ether_addr(dev->dev_addr))
 367                 return -EADDRNOTAVAIL;
 368
 369         err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
 370         if (err)
 371                 return err;
 372
 373         return ieee80211_do_open(dev, true);
 374 }
 375
 376 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
 377                               bool going_down)
 378 {
 379         struct ieee80211_local *local = sdata->local;
 380         unsigned long flags;
 381         struct sk_buff *skb, *tmp;
 382         u32 hw_reconf_flags = 0;
 383         int i;
 384         enum nl80211_channel_type orig_ct;
 385         bool cancel_scan;
 386
 387         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 388
 389         cancel_scan = local->scan_sdata == sdata;
 390         if (cancel_scan)
 391                 ieee80211_scan_cancel(local);
 392
 393         /*
 394          * Stop TX on this interface first.
 395          */
 396         netif_tx_stop_all_queues(sdata->dev);
 397
 398         /*
 399          * Purge work for this interface.
 400          */
 401         ieee80211_work_purge(sdata);
 402
 403         /*
 404          * Remove all stations associated with this interface.
 405          *
 406          * This must be done before calling ops->remove_interface()
 407          * because otherwise we can later invoke ops->sta_notify()
 408          * whenever the STAs are removed, and that invalidates driver
 409          * assumptions about always getting a vif pointer that is valid
 410          * (because if we remove a STA after ops->remove_interface()
 411          * the driver will have removed the vif info already!)
 412          *
 413          * This is relevant only in AP, WDS and mesh modes, since in
 414          * all other modes we've already removed all stations when
 415          * disconnecting etc.
 416          */
 417         sta_info_flush(local, sdata);
 418
 419         /*
 420          * Don't count this interface for promisc/allmulti while it
 421          * is down. dev_mc_unsync() will invoke set_multicast_list
 422          * on the master interface which will sync these down to the
 423          * hardware as filter flags.
 424          */
 425         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 426                 atomic_dec(&local->iff_allmultis);
 427
 428         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 429                 atomic_dec(&local->iff_promiscs);
 430
 431         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 432                 local->fif_pspoll--;
 433                 local->fif_probe_req--;
 434         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 435                 local->fif_probe_req--;
 436         }
 437
 438         netif_addr_lock_bh(sdata->dev);
 439         spin_lock_bh(&local->filter_lock);
 440         __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
 441                          sdata->dev->addr_len);
 442         spin_unlock_bh(&local->filter_lock);
 443         netif_addr_unlock_bh(sdata->dev);
 444
 445         ieee80211_configure_filter(local);
 446
 447         del_timer_sync(&local->dynamic_ps_timer);
 448         cancel_work_sync(&local->dynamic_ps_enable_work);
 449
 450         /* APs need special treatment */
 451         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 452                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
 453                 struct beacon_data *old_beacon =
 454                         rtnl_dereference(sdata->u.ap.beacon);
 455
 456                 /* sdata_running will return false, so this will disable */
 457                 ieee80211_bss_info_change_notify(sdata,
 458                                                  BSS_CHANGED_BEACON_ENABLED);
 459
 460                 /* remove beacon */
 461                 RCU_INIT_POINTER(sdata->u.ap.beacon, NULL);
 462                 synchronize_rcu();
 463                 kfree(old_beacon);
 464
 465                 /* down all dependent devices, that is VLANs */
 466                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
 467                                          u.vlan.list)
 468                         dev_close(vlan->dev);
 469                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
 470
 471                 /* free all potentially still buffered bcast frames */
 472                 local->total_ps_buffered -= skb_queue_len(&sdata->u.ap.ps_bc_buf);
 473                 skb_queue_purge(&sdata->u.ap.ps_bc_buf);
 474         }
 475
 476         if (going_down)
 477                 local->open_count--;
 478
 479         switch (sdata->vif.type) {
 480         case NL80211_IFTYPE_AP_VLAN:
 481                 list_del(&sdata->u.vlan.list);
 482                 /* no need to tell driver */
 483                 break;
 484         case NL80211_IFTYPE_MONITOR:
 485                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 486                         local->cooked_mntrs--;
 487                         break;
 488                 }
 489
 490                 local->monitors--;
 491                 if (local->monitors == 0) {
 492                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
 493                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 494                 }
 495
 496                 ieee80211_adjust_monitor_flags(sdata, -1);
 497                 ieee80211_configure_filter(local);
 498                 break;
 499         default:
 500                 mutex_lock(&local->mtx);
 501                 if (local->hw_roc_dev == sdata->dev &&
 502                     local->hw_roc_channel) {
 503                         /* ignore return value since this is racy */
 504                         drv_cancel_remain_on_channel(local);
 505                         ieee80211_queue_work(&local->hw, &local->hw_roc_done);
 506                 }
 507                 mutex_unlock(&local->mtx);
 508
 509                 flush_work(&local->hw_roc_start);
 510                 flush_work(&local->hw_roc_done);
 511
 512                 flush_work(&sdata->work);
 513                 /*
 514                  * When we get here, the interface is marked down.
 515                  * Call synchronize_rcu() to wait for the RX path
 516                  * should it be using the interface and enqueuing
 517                  * frames at this very time on another CPU.
 518                  */
 519                 synchronize_rcu();
 520                 skb_queue_purge(&sdata->skb_queue);
 521
 522                 /*
 523                  * Disable beaconing here for mesh only, AP and IBSS
 524                  * are already taken care of.
 525                  */
 526                 if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
 527                         ieee80211_bss_info_change_notify(sdata,
 528                                 BSS_CHANGED_BEACON_ENABLED);
 529
 530                 /*
 531                  * Free all remaining keys, there shouldn't be any,
 532                  * except maybe group keys in AP more or WDS?
 533                  */
 534                 ieee80211_free_keys(sdata);
 535
 536                 if (going_down)
 537                         drv_remove_interface(local, &sdata->vif);
 538         }
 539
 540         sdata->bss = NULL;
 541
 542         mutex_lock(&local->mtx);
 543         hw_reconf_flags |= __ieee80211_recalc_idle(local);
 544         mutex_unlock(&local->mtx);
 545
 546         ieee80211_recalc_ps(local, -1);
 547
 548         if (cancel_scan)
 549                 flush_delayed_work(&local->scan_work);
 550
 551         if (local->open_count == 0) {
 552                 if (local->ops->napi_poll)
 553                         napi_disable(&local->napi);
 554                 ieee80211_clear_tx_pending(local);
 555                 ieee80211_stop_device(local);
 556
 557                 /* no reconfiguring after stop! */
 558                 hw_reconf_flags = 0;
 559         }
 560
 561         /* Re-calculate channel-type, in case there are multiple vifs
 562          * on different channel types.
 563          */
 564         orig_ct = local->_oper_channel_type;
 565         ieee80211_set_channel_type(local, NULL, NL80211_CHAN_NO_HT);
 566
 567         /* do after stop to avoid reconfiguring when we stop anyway */
 568         if (hw_reconf_flags || (orig_ct != local->_oper_channel_type))
 569                 ieee80211_hw_config(local, hw_reconf_flags);
 570
 571         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 572         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 573                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
 574                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 575                         if (info->control.vif == &sdata->vif) {
 576                                 __skb_unlink(skb, &local->pending[i]);
 577                                 dev_kfree_skb_irq(skb);
 578                         }
 579                 }
 580         }
 581         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 582 }
 583
 584 static int ieee80211_stop(struct net_device *dev)
 585 {
 586         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 587
 588         ieee80211_do_stop(sdata, true);
 589
 590         return 0;
 591 }
 592
 593 static void ieee80211_set_multicast_list(struct net_device *dev)
 594 {
 595         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 596         struct ieee80211_local *local = sdata->local;
 597         int allmulti, promisc, sdata_allmulti, sdata_promisc;
 598
 599         allmulti = !!(dev->flags & IFF_ALLMULTI);
 600         promisc = !!(dev->flags & IFF_PROMISC);
 601         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
 602         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
 603
 604         if (allmulti != sdata_allmulti) {
 605                 if (dev->flags & IFF_ALLMULTI)
 606                         atomic_inc(&local->iff_allmultis);
 607                 else
 608                         atomic_dec(&local->iff_allmultis);
 609                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
 610         }
 611
 612         if (promisc != sdata_promisc) {
 613                 if (dev->flags & IFF_PROMISC)
 614                         atomic_inc(&local->iff_promiscs);
 615                 else
 616                         atomic_dec(&local->iff_promiscs);
 617                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
 618         }
 619         spin_lock_bh(&local->filter_lock);
 620         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
 621         spin_unlock_bh(&local->filter_lock);
 622         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
 623 }
 624
 625 /*
 626  * Called when the netdev is removed or, by the code below, before
 627  * the interface type changes.
 628  */
 629 static void ieee80211_teardown_sdata(struct net_device *dev)
 630 {
 631         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 632         struct ieee80211_local *local = sdata->local;
 633         int flushed;
 634         int i;
 635
 636         /* free extra data */
 637         ieee80211_free_keys(sdata);
 638
 639         ieee80211_debugfs_remove_netdev(sdata);
 640
 641         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
 642                 __skb_queue_purge(&sdata->fragments[i].skb_list);
 643         sdata->fragment_next = 0;
 644
 645         if (ieee80211_vif_is_mesh(&sdata->vif))
 646                 mesh_rmc_free(sdata);
 647
 648         flushed = sta_info_flush(local, sdata);
 649         WARN_ON(flushed);
 650 }
 651
 652 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
 653                                          struct sk_buff *skb)
 654 {
 655         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
 656 }
 657
 658 static const struct net_device_ops ieee80211_dataif_ops = {
 659         .ndo_open               = ieee80211_open,
 660         .ndo_stop               = ieee80211_stop,
 661         .ndo_uninit             = ieee80211_teardown_sdata,
 662         .ndo_start_xmit         = ieee80211_subif_start_xmit,
 663         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
 664         .ndo_change_mtu         = ieee80211_change_mtu,
 665         .ndo_set_mac_address    = ieee80211_change_mac,
 666         .ndo_select_queue       = ieee80211_netdev_select_queue,
 667 };
 668
 669 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
 670                                           struct sk_buff *skb)
 671 {
 672         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 673         struct ieee80211_local *local = sdata->local;
 674         struct ieee80211_hdr *hdr;
 675         struct ieee80211_radiotap_header *rtap = (void *)skb->data;
 676         u8 *p;
 677
 678         if (local->hw.queues < 4)
 679                 return 0;
 680
 681         if (skb->len < 4 ||
 682             skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
 683                 return 0; /* doesn't matter, frame will be dropped */
 684
 685         hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
 686
 687         if (!ieee80211_is_data(hdr->frame_control)) {
 688                 skb->priority = 7;
 689                 return ieee802_1d_to_ac[skb->priority];
 690         }
 691         if (!ieee80211_is_data_qos(hdr->frame_control)) {
 692                 skb->priority = 0;
 693                 return ieee802_1d_to_ac[skb->priority];
 694         }
 695
 696         p = ieee80211_get_qos_ctl(hdr);
 697         skb->priority = *p & IEEE80211_QOS_CTL_TAG1D_MASK;
 698
 699         return ieee80211_downgrade_queue(local, skb);
 700 }
 701
 702 static const struct net_device_ops ieee80211_monitorif_ops = {
 703         .ndo_open               = ieee80211_open,
 704         .ndo_stop               = ieee80211_stop,
 705         .ndo_uninit             = ieee80211_teardown_sdata,
 706         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
 707         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
 708         .ndo_change_mtu         = ieee80211_change_mtu,
 709         .ndo_set_mac_address    = eth_mac_addr,
 710         .ndo_select_queue       = ieee80211_monitor_select_queue,
 711 };
 712
 713 static void ieee80211_if_setup(struct net_device *dev)
 714 {
 715         ether_setup(dev);
 716         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
 717         dev->netdev_ops = &ieee80211_dataif_ops;
 718         dev->destructor = free_netdev;
 719 }
 720
 721 static void ieee80211_iface_work(struct work_struct *work)
 722 {
 723         struct ieee80211_sub_if_data *sdata =
 724                 container_of(work, struct ieee80211_sub_if_data, work);
 725         struct ieee80211_local *local = sdata->local;
 726         struct sk_buff *skb;
 727         struct sta_info *sta;
 728         struct ieee80211_ra_tid *ra_tid;
 729
 730         if (!ieee80211_sdata_running(sdata))
 731                 return;
 732
 733         if (local->scanning)
 734                 return;
 735
 736         /*
 737          * ieee80211_queue_work() should have picked up most cases,
 738          * here we'll pick the rest.
 739          */
 740         if (WARN(local->suspended,
 741                  "interface work scheduled while going to suspend\n"))
 742                 return;
 743
 744         /* first process frames */
 745         while ((skb = skb_dequeue(&sdata->skb_queue))) {
 746                 struct ieee80211_mgmt *mgmt = (void *)skb->data;
 747
 748                 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
 749                         ra_tid = (void *)&skb->cb;
 750                         ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
 751                                                  ra_tid->tid);
 752                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
 753                         ra_tid = (void *)&skb->cb;
 754                         ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
 755                                                 ra_tid->tid);
 756                 } else if (ieee80211_is_action(mgmt->frame_control) &&
 757                            mgmt->u.action.category == WLAN_CATEGORY_BACK) {
 758                         int len = skb->len;
 759
 760                         mutex_lock(&local->sta_mtx);
 761                         sta = sta_info_get_bss(sdata, mgmt->sa);
 762                         if (sta) {
 763                                 switch (mgmt->u.action.u.addba_req.action_code) {
 764                                 case WLAN_ACTION_ADDBA_REQ:
 765                                         ieee80211_process_addba_request(
 766                                                         local, sta, mgmt, len);
 767                                         break;
 768                                 case WLAN_ACTION_ADDBA_RESP:
 769                                         ieee80211_process_addba_resp(local, sta,
 770                                                                      mgmt, len);
 771                                         break;
 772                                 case WLAN_ACTION_DELBA:
 773                                         ieee80211_process_delba(sdata, sta,
 774                                                                 mgmt, len);
 775                                         break;
 776                                 default:
 777                                         WARN_ON(1);
 778                                         break;
 779                                 }
 780                         }
 781                         mutex_unlock(&local->sta_mtx);
 782                 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
 783                         struct ieee80211_hdr *hdr = (void *)mgmt;
 784                         /*
 785                          * So the frame isn't mgmt, but frame_control
 786                          * is at the right place anyway, of course, so
 787                          * the if statement is correct.
 788                          *
 789                          * Warn if we have other data frame types here,
 790                          * they must not get here.
 791                          */
 792                         WARN_ON(hdr->frame_control &
 793                                         cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
 794                         WARN_ON(!(hdr->seq_ctrl &
 795                                         cpu_to_le16(IEEE80211_SCTL_FRAG)));
 796                         /*
 797                          * This was a fragment of a frame, received while
 798                          * a block-ack session was active. That cannot be
 799                          * right, so terminate the session.
 800                          */
 801                         mutex_lock(&local->sta_mtx);
 802                         sta = sta_info_get_bss(sdata, mgmt->sa);
 803                         if (sta) {
 804                                 u16 tid = *ieee80211_get_qos_ctl(hdr) &
 805                                                 IEEE80211_QOS_CTL_TID_MASK;
 806
 807                                 __ieee80211_stop_rx_ba_session(
 808                                         sta, tid, WLAN_BACK_RECIPIENT,
 809                                         WLAN_REASON_QSTA_REQUIRE_SETUP,
 810                                         true);
 811                         }
 812                         mutex_unlock(&local->sta_mtx);
 813                 } else switch (sdata->vif.type) {
 814                 case NL80211_IFTYPE_STATION:
 815                         ieee80211_sta_rx_queued_mgmt(sdata, skb);
 816                         break;
 817                 case NL80211_IFTYPE_ADHOC:
 818                         ieee80211_ibss_rx_queued_mgmt(sdata, skb);
 819                         break;
 820                 case NL80211_IFTYPE_MESH_POINT:
 821                         if (!ieee80211_vif_is_mesh(&sdata->vif))
 822                                 break;
 823                         ieee80211_mesh_rx_queued_mgmt(sdata, skb);
 824                         break;
 825                 default:
 826                         WARN(1, "frame for unexpected interface type");
 827                         break;
 828                 }
 829
 830                 kfree_skb(skb);
 831         }
 832
 833         /* then other type-dependent work */
 834         switch (sdata->vif.type) {
 835         case NL80211_IFTYPE_STATION:
 836                 ieee80211_sta_work(sdata);
 837                 break;
 838         case NL80211_IFTYPE_ADHOC:
 839                 ieee80211_ibss_work(sdata);
 840                 break;
 841         case NL80211_IFTYPE_MESH_POINT:
 842                 if (!ieee80211_vif_is_mesh(&sdata->vif))
 843                         break;
 844                 ieee80211_mesh_work(sdata);
 845                 break;
 846         default:
 847                 break;
 848         }
 849 }
 850
 851
 852 /*
 853  * Helper function to initialise an interface to a specific type.
 854  */
 855 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
 856                                   enum nl80211_iftype type)
 857 {
 858         /* clear type-dependent union */
 859         memset(&sdata->u, 0, sizeof(sdata->u));
 860
 861         /* and set some type-dependent values */
 862         sdata->vif.type = type;
 863         sdata->vif.p2p = false;
 864         sdata->dev->netdev_ops = &ieee80211_dataif_ops;
 865         sdata->wdev.iftype = type;
 866
 867         sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
 868         sdata->control_port_no_encrypt = false;
 869
 870         /* only monitor differs */
 871         sdata->dev->type = ARPHRD_ETHER;
 872
 873         skb_queue_head_init(&sdata->skb_queue);
 874         INIT_WORK(&sdata->work, ieee80211_iface_work);
 875
 876         switch (type) {
 877         case NL80211_IFTYPE_P2P_GO:
 878                 type = NL80211_IFTYPE_AP;
 879                 sdata->vif.type = type;
 880                 sdata->vif.p2p = true;
 881                 /* fall through */
 882         case NL80211_IFTYPE_AP:
 883                 skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
 884                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
 885                 break;
 886         case NL80211_IFTYPE_P2P_CLIENT:
 887                 type = NL80211_IFTYPE_STATION;
 888                 sdata->vif.type = type;
 889                 sdata->vif.p2p = true;
 890                 /* fall through */
 891         case NL80211_IFTYPE_STATION:
 892                 ieee80211_sta_setup_sdata(sdata);
 893                 break;
 894         case NL80211_IFTYPE_ADHOC:
 895                 ieee80211_ibss_setup_sdata(sdata);
 896                 break;
 897         case NL80211_IFTYPE_MESH_POINT:
 898                 if (ieee80211_vif_is_mesh(&sdata->vif))
 899                         ieee80211_mesh_init_sdata(sdata);
 900                 break;
 901         case NL80211_IFTYPE_MONITOR:
 902                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
 903                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
 904                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
 905                                       MONITOR_FLAG_OTHER_BSS;
 906                 break;
 907         case NL80211_IFTYPE_WDS:
 908         case NL80211_IFTYPE_AP_VLAN:
 909                 break;
 910         case NL80211_IFTYPE_UNSPECIFIED:
 911         case NUM_NL80211_IFTYPES:
 912                 BUG();
 913                 break;
 914         }
 915
 916         ieee80211_debugfs_add_netdev(sdata);
 917 }
 918
 919 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
 920                                            enum nl80211_iftype type)
 921 {
 922         struct ieee80211_local *local = sdata->local;
 923         int ret, err;
 924         enum nl80211_iftype internal_type = type;
 925         bool p2p = false;
 926
 927         ASSERT_RTNL();
 928
 929         if (!local->ops->change_interface)
 930                 return -EBUSY;
 931
 932         switch (sdata->vif.type) {
 933         case NL80211_IFTYPE_AP:
 934         case NL80211_IFTYPE_STATION:
 935         case NL80211_IFTYPE_ADHOC:
 936                 /*
 937                  * Could maybe also all others here?
 938                  * Just not sure how that interacts
 939                  * with the RX/config path e.g. for
 940                  * mesh.
 941                  */
 942                 break;
 943         default:
 944                 return -EBUSY;
 945         }
 946
 947         switch (type) {
 948         case NL80211_IFTYPE_AP:
 949         case NL80211_IFTYPE_STATION:
 950         case NL80211_IFTYPE_ADHOC:
 951                 /*
 952                  * Could probably support everything
 953                  * but WDS here (WDS do_open can fail
 954                  * under memory pressure, which this
 955                  * code isn't prepared to handle).
 956                  */
 957                 break;
 958         case NL80211_IFTYPE_P2P_CLIENT:
 959                 p2p = true;
 960                 internal_type = NL80211_IFTYPE_STATION;
 961                 break;
 962         case NL80211_IFTYPE_P2P_GO:
 963                 p2p = true;
 964                 internal_type = NL80211_IFTYPE_AP;
 965                 break;
 966         default:
 967                 return -EBUSY;
 968         }
 969
 970         ret = ieee80211_check_concurrent_iface(sdata, internal_type);
 971         if (ret)
 972                 return ret;
 973
 974         ieee80211_do_stop(sdata, false);
 975
 976         ieee80211_teardown_sdata(sdata->dev);
 977
 978         ret = drv_change_interface(local, sdata, internal_type, p2p);
 979         if (ret)
 980                 type = sdata->vif.type;
 981
 982         ieee80211_setup_sdata(sdata, type);
 983
 984         err = ieee80211_do_open(sdata->dev, false);
 985         WARN(err, "type change: do_open returned %d", err);
 986
 987         return ret;
 988 }
 989
 990 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
 991                              enum nl80211_iftype type)
 992 {
 993         int ret;
 994
 995         ASSERT_RTNL();
 996
 997         if (type == ieee80211_vif_type_p2p(&sdata->vif))
 998                 return 0;
 999
1000         /* Setting ad-hoc mode on non-IBSS channel is not supported. */
1001         if (sdata->local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS &&
1002             type == NL80211_IFTYPE_ADHOC)
1003                 return -EOPNOTSUPP;
1004
1005         if (ieee80211_sdata_running(sdata)) {
1006                 ret = ieee80211_runtime_change_iftype(sdata, type);
1007                 if (ret)
1008                         return ret;
1009         } else {
1010                 /* Purge and reset type-dependent state. */
1011                 ieee80211_teardown_sdata(sdata->dev);
1012                 ieee80211_setup_sdata(sdata, type);
1013         }
1014
1015         /* reset some values that shouldn't be kept across type changes */
1016         sdata->vif.bss_conf.basic_rates =
1017                 ieee80211_mandatory_rates(sdata->local,
1018                         sdata->local->hw.conf.channel->band);
1019         sdata->drop_unencrypted = 0;
1020         if (type == NL80211_IFTYPE_STATION)
1021                 sdata->u.mgd.use_4addr = false;
1022
1023         return 0;
1024 }
1025
1026 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1027                                        struct net_device *dev,
1028                                        enum nl80211_iftype type)
1029 {
1030         struct ieee80211_sub_if_data *sdata;
1031         u64 mask, start, addr, val, inc;
1032         u8 *m;
1033         u8 tmp_addr[ETH_ALEN];
1034         int i;
1035
1036         /* default ... something at least */
1037         memcpy(dev->perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1038
1039         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1040             local->hw.wiphy->n_addresses <= 1)
1041                 return;
1042
1043
1044         mutex_lock(&local->iflist_mtx);
1045
1046         switch (type) {
1047         case NL80211_IFTYPE_MONITOR:
1048                 /* doesn't matter */
1049                 break;
1050         case NL80211_IFTYPE_WDS:
1051         case NL80211_IFTYPE_AP_VLAN:
1052                 /* match up with an AP interface */
1053                 list_for_each_entry(sdata, &local->interfaces, list) {
1054                         if (sdata->vif.type != NL80211_IFTYPE_AP)
1055                                 continue;
1056                         memcpy(dev->perm_addr, sdata->vif.addr, ETH_ALEN);
1057                         break;
1058                 }
1059                 /* keep default if no AP interface present */
1060                 break;
1061         default:
1062                 /* assign a new address if possible -- try n_addresses first */
1063                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1064                         bool used = false;
1065
1066                         list_for_each_entry(sdata, &local->interfaces, list) {
1067                                 if (memcmp(local->hw.wiphy->addresses[i].addr,
1068                                            sdata->vif.addr, ETH_ALEN) == 0) {
1069                                         used = true;
1070                                         break;
1071                                 }
1072                         }
1073
1074                         if (!used) {
1075                                 memcpy(dev->perm_addr,
1076                                        local->hw.wiphy->addresses[i].addr,
1077                                        ETH_ALEN);
1078                                 break;
1079                         }
1080                 }
1081
1082                 /* try mask if available */
1083                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1084                         break;
1085
1086                 m = local->hw.wiphy->addr_mask;
1087                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1088                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1089                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1090
1091                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1092                         /* not a contiguous mask ... not handled now! */
1093                         printk(KERN_DEBUG "not contiguous\n");
1094                         break;
1095                 }
1096
1097                 m = local->hw.wiphy->perm_addr;
1098                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1099                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1100                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1101
1102                 inc = 1ULL<<__ffs64(mask);
1103                 val = (start & mask);
1104                 addr = (start & ~mask) | (val & mask);
1105                 do {
1106                         bool used = false;
1107
1108                         tmp_addr[5] = addr >> 0*8;
1109                         tmp_addr[4] = addr >> 1*8;
1110                         tmp_addr[3] = addr >> 2*8;
1111                         tmp_addr[2] = addr >> 3*8;
1112                         tmp_addr[1] = addr >> 4*8;
1113                         tmp_addr[0] = addr >> 5*8;
1114
1115                         val += inc;
1116
1117                         list_for_each_entry(sdata, &local->interfaces, list) {
1118                                 if (memcmp(tmp_addr, sdata->vif.addr,
1119                                                         ETH_ALEN) == 0) {
1120                                         used = true;
1121                                         break;
1122                                 }
1123                         }
1124
1125                         if (!used) {
1126                                 memcpy(dev->perm_addr, tmp_addr, ETH_ALEN);
1127                                 break;
1128                         }
1129                         addr = (start & ~mask) | (val & mask);
1130                 } while (addr != start);
1131
1132                 break;
1133         }
1134
1135         mutex_unlock(&local->iflist_mtx);
1136 }
1137
1138 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1139                      struct net_device **new_dev, enum nl80211_iftype type,
1140                      struct vif_params *params)
1141 {
1142         struct net_device *ndev;
1143         struct ieee80211_sub_if_data *sdata = NULL;
1144         int ret, i;
1145
1146         ASSERT_RTNL();
1147
1148         ndev = alloc_netdev_mqs(sizeof(*sdata) + local->hw.vif_data_size,
1149                                 name, ieee80211_if_setup, local->hw.queues, 1);
1150         if (!ndev)
1151                 return -ENOMEM;
1152         dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1153
1154         ndev->needed_headroom = local->tx_headroom +
1155                                 4*6 /* four MAC addresses */
1156                                 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1157                                 + 6 /* mesh */
1158                                 + 8 /* rfc1042/bridge tunnel */
1159                                 - ETH_HLEN /* ethernet hard_header_len */
1160                                 + IEEE80211_ENCRYPT_HEADROOM;
1161         ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1162
1163         ret = dev_alloc_name(ndev, ndev->name);
1164         if (ret < 0)
1165                 goto fail;
1166
1167         ieee80211_assign_perm_addr(local, ndev, type);
1168         memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1169         SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1170
1171         /* don't use IEEE80211_DEV_TO_SUB_IF because it checks too much */
1172         sdata = netdev_priv(ndev);
1173         ndev->ieee80211_ptr = &sdata->wdev;
1174         memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1175         memcpy(sdata->name, ndev->name, IFNAMSIZ);
1176
1177         /* initialise type-independent data */
1178         sdata->wdev.wiphy = local->hw.wiphy;
1179         sdata->local = local;
1180         sdata->dev = ndev;
1181 #ifdef CONFIG_INET
1182         sdata->arp_filter_state = true;
1183 #endif
1184
1185         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1186                 skb_queue_head_init(&sdata->fragments[i].skb_list);
1187
1188         INIT_LIST_HEAD(&sdata->key_list);
1189
1190         for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1191                 struct ieee80211_supported_band *sband;
1192                 sband = local->hw.wiphy->bands[i];
1193                 sdata->rc_rateidx_mask[i] =
1194                         sband ? (1 << sband->n_bitrates) - 1 : 0;
1195         }
1196
1197         /* setup type-dependent data */
1198         ieee80211_setup_sdata(sdata, type);
1199
1200         if (params) {
1201                 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1202                 if (type == NL80211_IFTYPE_STATION)
1203                         sdata->u.mgd.use_4addr = params->use_4addr;
1204         }
1205
1206         ret = register_netdevice(ndev);
1207         if (ret)
1208                 goto fail;
1209
1210         mutex_lock(&local->iflist_mtx);
1211         list_add_tail_rcu(&sdata->list, &local->interfaces);
1212         mutex_unlock(&local->iflist_mtx);
1213
1214         if (new_dev)
1215                 *new_dev = ndev;
1216
1217         return 0;
1218
1219  fail:
1220         free_netdev(ndev);
1221         return ret;
1222 }
1223
1224 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1225 {
1226         ASSERT_RTNL();
1227
1228         mutex_lock(&sdata->local->iflist_mtx);
1229         list_del_rcu(&sdata->list);
1230         mutex_unlock(&sdata->local->iflist_mtx);
1231
1232         if (ieee80211_vif_is_mesh(&sdata->vif))
1233                 mesh_path_flush_by_iface(sdata);
1234
1235         synchronize_rcu();
1236         unregister_netdevice(sdata->dev);
1237 }
1238
1239 /*
1240  * Remove all interfaces, may only be called at hardware unregistration
1241  * time because it doesn't do RCU-safe list removals.
1242  */
1243 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1244 {
1245         struct ieee80211_sub_if_data *sdata, *tmp;
1246         LIST_HEAD(unreg_list);
1247
1248         ASSERT_RTNL();
1249
1250         /*
1251          * Close all AP_VLAN interfaces first, as otherwise they
1252          * might be closed while the AP interface they belong to
1253          * is closed, causing unregister_netdevice_many() to crash.
1254          */
1255         list_for_each_entry(sdata, &local->interfaces, list)
1256                 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1257                         dev_close(sdata->dev);
1258
1259         mutex_lock(&local->iflist_mtx);
1260         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1261                 list_del(&sdata->list);
1262
1263                 if (ieee80211_vif_is_mesh(&sdata->vif))
1264                         mesh_path_flush_by_iface(sdata);
1265
1266                 unregister_netdevice_queue(sdata->dev, &unreg_list);
1267         }
1268         mutex_unlock(&local->iflist_mtx);
1269         unregister_netdevice_many(&unreg_list);
1270         list_del(&unreg_list);
1271 }
1272
1273 static u32 ieee80211_idle_off(struct ieee80211_local *local,
1274                               const char *reason)
1275 {
1276         if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
1277                 return 0;
1278
1279 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1280         wiphy_debug(local->hw.wiphy, "device no longer idle - %s\n", reason);
1281 #endif
1282
1283         local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
1284         return IEEE80211_CONF_CHANGE_IDLE;
1285 }
1286
1287 static u32 ieee80211_idle_on(struct ieee80211_local *local)
1288 {
1289         if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
1290                 return 0;
1291
1292 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1293         wiphy_debug(local->hw.wiphy, "device now idle\n");
1294 #endif
1295
1296         drv_flush(local, false);
1297
1298         local->hw.conf.flags |= IEEE80211_CONF_IDLE;
1299         return IEEE80211_CONF_CHANGE_IDLE;
1300 }
1301
1302 u32 __ieee80211_recalc_idle(struct ieee80211_local *local)
1303 {
1304         struct ieee80211_sub_if_data *sdata;
1305         int count = 0;
1306         bool working = false, scanning = false, hw_roc = false;
1307         struct ieee80211_work *wk;
1308         unsigned int led_trig_start = 0, led_trig_stop = 0;
1309
1310 #ifdef CONFIG_PROVE_LOCKING
1311         WARN_ON(debug_locks && !lockdep_rtnl_is_held() &&
1312                 !lockdep_is_held(&local->iflist_mtx));
1313 #endif
1314         lockdep_assert_held(&local->mtx);
1315
1316         list_for_each_entry(sdata, &local->interfaces, list) {
1317                 if (!ieee80211_sdata_running(sdata)) {
1318                         sdata->vif.bss_conf.idle = true;
1319                         continue;
1320                 }
1321
1322                 sdata->old_idle = sdata->vif.bss_conf.idle;
1323
1324                 /* do not count disabled managed interfaces */
1325                 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1326                     !sdata->u.mgd.associated) {
1327                         sdata->vif.bss_conf.idle = true;
1328                         continue;
1329                 }
1330                 /* do not count unused IBSS interfaces */
1331                 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
1332                     !sdata->u.ibss.ssid_len) {
1333                         sdata->vif.bss_conf.idle = true;
1334                         continue;
1335                 }
1336                 /* count everything else */
1337                 count++;
1338         }
1339
1340         list_for_each_entry(wk, &local->work_list, list) {
1341                 working = true;
1342                 wk->sdata->vif.bss_conf.idle = false;
1343         }
1344
1345         if (local->scan_sdata) {
1346                 scanning = true;
1347                 local->scan_sdata->vif.bss_conf.idle = false;
1348         }
1349
1350         if (local->hw_roc_channel)
1351                 hw_roc = true;
1352
1353         list_for_each_entry(sdata, &local->interfaces, list) {
1354                 if (sdata->old_idle == sdata->vif.bss_conf.idle)
1355                         continue;
1356                 if (!ieee80211_sdata_running(sdata))
1357                         continue;
1358                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_IDLE);
1359         }
1360
1361         if (working || scanning || hw_roc)
1362                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
1363         else
1364                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
1365
1366         if (count)
1367                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
1368         else
1369                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
1370
1371         ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
1372
1373         if (hw_roc)
1374                 return ieee80211_idle_off(local, "hw remain-on-channel");
1375         if (working)
1376                 return ieee80211_idle_off(local, "working");
1377         if (scanning)
1378                 return ieee80211_idle_off(local, "scanning");
1379         if (!count)
1380                 return ieee80211_idle_on(local);
1381         else
1382                 return ieee80211_idle_off(local, "in use");
1383
1384         return 0;
1385 }
1386
1387 void ieee80211_recalc_idle(struct ieee80211_local *local)
1388 {
1389         u32 chg;
1390
1391         mutex_lock(&local->iflist_mtx);
1392         chg = __ieee80211_recalc_idle(local);
1393         mutex_unlock(&local->iflist_mtx);
1394         if (chg)
1395                 ieee80211_hw_config(local, chg);
1396 }
1397
1398 static int netdev_notify(struct notifier_block *nb,
1399                          unsigned long state,
1400                          void *ndev)
1401 {
1402         struct net_device *dev = ndev;
1403         struct ieee80211_sub_if_data *sdata;
1404
1405         if (state != NETDEV_CHANGENAME)
1406                 return 0;
1407
1408         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1409                 return 0;
1410
1411         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1412                 return 0;
1413
1414         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1415
1416         memcpy(sdata->name, dev->name, IFNAMSIZ);
1417
1418         ieee80211_debugfs_rename_netdev(sdata);
1419         return 0;
1420 }
1421
1422 static struct notifier_block mac80211_netdev_notifier = {
1423         .notifier_call = netdev_notify,
1424 };
1425
1426 int ieee80211_iface_init(void)
1427 {
1428         return register_netdevice_notifier(&mac80211_netdev_notifier);
1429 }
1430
1431 void ieee80211_iface_exit(void)
1432 {
1433         unregister_netdevice_notifier(&mac80211_netdev_notifier);
1434 }