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 locking required since STA is not live yet */
 303                 sta->flags |= 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_zero_ether_addr(dev->dev_addr) &&
 367             !is_valid_ether_addr(dev->dev_addr))
 368                 return -EADDRNOTAVAIL;
 369
 370         err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
 371         if (err)
 372                 return err;
 373
 374         return ieee80211_do_open(dev, true);
 375 }
 376
 377 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
 378                               bool going_down)
 379 {
 380         struct ieee80211_local *local = sdata->local;
 381         unsigned long flags;
 382         struct sk_buff *skb, *tmp;
 383         u32 hw_reconf_flags = 0;
 384         int i;
 385
 386         if (local->scan_sdata == sdata)
 387                 ieee80211_scan_cancel(local);
 388
 389         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 390
 391         /*
 392          * Stop TX on this interface first.
 393          */
 394         netif_tx_stop_all_queues(sdata->dev);
 395
 396         /*
 397          * Purge work for this interface.
 398          */
 399         ieee80211_work_purge(sdata);
 400
 401         /*
 402          * Remove all stations associated with this interface.
 403          *
 404          * This must be done before calling ops->remove_interface()
 405          * because otherwise we can later invoke ops->sta_notify()
 406          * whenever the STAs are removed, and that invalidates driver
 407          * assumptions about always getting a vif pointer that is valid
 408          * (because if we remove a STA after ops->remove_interface()
 409          * the driver will have removed the vif info already!)
 410          *
 411          * This is relevant only in AP, WDS and mesh modes, since in
 412          * all other modes we've already removed all stations when
 413          * disconnecting etc.
 414          */
 415         sta_info_flush(local, sdata);
 416
 417         /*
 418          * Don't count this interface for promisc/allmulti while it
 419          * is down. dev_mc_unsync() will invoke set_multicast_list
 420          * on the master interface which will sync these down to the
 421          * hardware as filter flags.
 422          */
 423         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 424                 atomic_dec(&local->iff_allmultis);
 425
 426         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 427                 atomic_dec(&local->iff_promiscs);
 428
 429         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 430                 local->fif_pspoll--;
 431                 local->fif_probe_req--;
 432         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 433                 local->fif_probe_req--;
 434         }
 435
 436         netif_addr_lock_bh(sdata->dev);
 437         spin_lock_bh(&local->filter_lock);
 438         __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
 439                          sdata->dev->addr_len);
 440         spin_unlock_bh(&local->filter_lock);
 441         netif_addr_unlock_bh(sdata->dev);
 442
 443         ieee80211_configure_filter(local);
 444
 445         del_timer_sync(&local->dynamic_ps_timer);
 446         cancel_work_sync(&local->dynamic_ps_enable_work);
 447
 448         /* APs need special treatment */
 449         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 450                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
 451                 struct beacon_data *old_beacon = sdata->u.ap.beacon;
 452
 453                 /* sdata_running will return false, so this will disable */
 454                 ieee80211_bss_info_change_notify(sdata,
 455                                                  BSS_CHANGED_BEACON_ENABLED);
 456
 457                 /* remove beacon */
 458                 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
 459                 synchronize_rcu();
 460                 kfree(old_beacon);
 461
 462                 /* free all potentially still buffered bcast frames */
 463                 while ((skb = skb_dequeue(&sdata->u.ap.ps_bc_buf))) {
 464                         local->total_ps_buffered--;
 465                         dev_kfree_skb(skb);
 466                 }
 467
 468                 /* down all dependent devices, that is VLANs */
 469                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
 470                                          u.vlan.list)
 471                         dev_close(vlan->dev);
 472                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
 473         }
 474
 475         if (going_down)
 476                 local->open_count--;
 477
 478         switch (sdata->vif.type) {
 479         case NL80211_IFTYPE_AP_VLAN:
 480                 list_del(&sdata->u.vlan.list);
 481                 /* no need to tell driver */
 482                 break;
 483         case NL80211_IFTYPE_MONITOR:
 484                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 485                         local->cooked_mntrs--;
 486                         break;
 487                 }
 488
 489                 local->monitors--;
 490                 if (local->monitors == 0) {
 491                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
 492                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 493                 }
 494
 495                 ieee80211_adjust_monitor_flags(sdata, -1);
 496                 ieee80211_configure_filter(local);
 497                 break;
 498         default:
 499                 flush_work(&sdata->work);
 500                 /*
 501                  * When we get here, the interface is marked down.
 502                  * Call synchronize_rcu() to wait for the RX path
 503                  * should it be using the interface and enqueuing
 504                  * frames at this very time on another CPU.
 505                  */
 506                 synchronize_rcu();
 507                 skb_queue_purge(&sdata->skb_queue);
 508
 509                 /*
 510                  * Disable beaconing here for mesh only, AP and IBSS
 511                  * are already taken care of.
 512                  */
 513                 if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
 514                         ieee80211_bss_info_change_notify(sdata,
 515                                 BSS_CHANGED_BEACON_ENABLED);
 516
 517                 /*
 518                  * Free all remaining keys, there shouldn't be any,
 519                  * except maybe group keys in AP more or WDS?
 520                  */
 521                 ieee80211_free_keys(sdata);
 522
 523                 if (going_down)
 524                         drv_remove_interface(local, &sdata->vif);
 525         }
 526
 527         sdata->bss = NULL;
 528
 529         mutex_lock(&local->mtx);
 530         hw_reconf_flags |= __ieee80211_recalc_idle(local);
 531         mutex_unlock(&local->mtx);
 532
 533         ieee80211_recalc_ps(local, -1);
 534
 535         if (local->open_count == 0) {
 536                 if (local->ops->napi_poll)
 537                         napi_disable(&local->napi);
 538                 ieee80211_clear_tx_pending(local);
 539                 ieee80211_stop_device(local);
 540
 541                 /* no reconfiguring after stop! */
 542                 hw_reconf_flags = 0;
 543         }
 544
 545         /* do after stop to avoid reconfiguring when we stop anyway */
 546         if (hw_reconf_flags)
 547                 ieee80211_hw_config(local, hw_reconf_flags);
 548
 549         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 550         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 551                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
 552                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 553                         if (info->control.vif == &sdata->vif) {
 554                                 __skb_unlink(skb, &local->pending[i]);
 555                                 dev_kfree_skb_irq(skb);
 556                         }
 557                 }
 558         }
 559         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 560 }
 561
 562 static int ieee80211_stop(struct net_device *dev)
 563 {
 564         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 565
 566         ieee80211_do_stop(sdata, true);
 567
 568         return 0;
 569 }
 570
 571 static void ieee80211_set_multicast_list(struct net_device *dev)
 572 {
 573         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 574         struct ieee80211_local *local = sdata->local;
 575         int allmulti, promisc, sdata_allmulti, sdata_promisc;
 576
 577         allmulti = !!(dev->flags & IFF_ALLMULTI);
 578         promisc = !!(dev->flags & IFF_PROMISC);
 579         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
 580         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
 581
 582         if (allmulti != sdata_allmulti) {
 583                 if (dev->flags & IFF_ALLMULTI)
 584                         atomic_inc(&local->iff_allmultis);
 585                 else
 586                         atomic_dec(&local->iff_allmultis);
 587                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
 588         }
 589
 590         if (promisc != sdata_promisc) {
 591                 if (dev->flags & IFF_PROMISC)
 592                         atomic_inc(&local->iff_promiscs);
 593                 else
 594                         atomic_dec(&local->iff_promiscs);
 595                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
 596         }
 597         spin_lock_bh(&local->filter_lock);
 598         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
 599         spin_unlock_bh(&local->filter_lock);
 600         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
 601 }
 602
 603 /*
 604  * Called when the netdev is removed or, by the code below, before
 605  * the interface type changes.
 606  */
 607 static void ieee80211_teardown_sdata(struct net_device *dev)
 608 {
 609         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 610         struct ieee80211_local *local = sdata->local;
 611         int flushed;
 612         int i;
 613
 614         /* free extra data */
 615         ieee80211_free_keys(sdata);
 616
 617         ieee80211_debugfs_remove_netdev(sdata);
 618
 619         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
 620                 __skb_queue_purge(&sdata->fragments[i].skb_list);
 621         sdata->fragment_next = 0;
 622
 623         if (ieee80211_vif_is_mesh(&sdata->vif))
 624                 mesh_rmc_free(sdata);
 625
 626         flushed = sta_info_flush(local, sdata);
 627         WARN_ON(flushed);
 628 }
 629
 630 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
 631                                          struct sk_buff *skb)
 632 {
 633         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
 634 }
 635
 636 static const struct net_device_ops ieee80211_dataif_ops = {
 637         .ndo_open               = ieee80211_open,
 638         .ndo_stop               = ieee80211_stop,
 639         .ndo_uninit             = ieee80211_teardown_sdata,
 640         .ndo_start_xmit         = ieee80211_subif_start_xmit,
 641         .ndo_set_multicast_list = ieee80211_set_multicast_list,
 642         .ndo_change_mtu         = ieee80211_change_mtu,
 643         .ndo_set_mac_address    = ieee80211_change_mac,
 644         .ndo_select_queue       = ieee80211_netdev_select_queue,
 645 };
 646
 647 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
 648                                           struct sk_buff *skb)
 649 {
 650         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 651         struct ieee80211_local *local = sdata->local;
 652         struct ieee80211_hdr *hdr;
 653         struct ieee80211_radiotap_header *rtap = (void *)skb->data;
 654         u8 *p;
 655
 656         if (local->hw.queues < 4)
 657                 return 0;
 658
 659         if (skb->len < 4 ||
 660             skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
 661                 return 0; /* doesn't matter, frame will be dropped */
 662
 663         hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
 664
 665         if (!ieee80211_is_data(hdr->frame_control)) {
 666                 skb->priority = 7;
 667                 return ieee802_1d_to_ac[skb->priority];
 668         }
 669         if (!ieee80211_is_data_qos(hdr->frame_control)) {
 670                 skb->priority = 0;
 671                 return ieee802_1d_to_ac[skb->priority];
 672         }
 673
 674         p = ieee80211_get_qos_ctl(hdr);
 675         skb->priority = *p & IEEE80211_QOS_CTL_TAG1D_MASK;
 676
 677         return ieee80211_downgrade_queue(local, skb);
 678 }
 679
 680 static const struct net_device_ops ieee80211_monitorif_ops = {
 681         .ndo_open               = ieee80211_open,
 682         .ndo_stop               = ieee80211_stop,
 683         .ndo_uninit             = ieee80211_teardown_sdata,
 684         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
 685         .ndo_set_multicast_list = ieee80211_set_multicast_list,
 686         .ndo_change_mtu         = ieee80211_change_mtu,
 687         .ndo_set_mac_address    = eth_mac_addr,
 688         .ndo_select_queue       = ieee80211_monitor_select_queue,
 689 };
 690
 691 static void ieee80211_if_setup(struct net_device *dev)
 692 {
 693         ether_setup(dev);
 694         dev->netdev_ops = &ieee80211_dataif_ops;
 695         dev->destructor = free_netdev;
 696 }
 697
 698 static void ieee80211_iface_work(struct work_struct *work)
 699 {
 700         struct ieee80211_sub_if_data *sdata =
 701                 container_of(work, struct ieee80211_sub_if_data, work);
 702         struct ieee80211_local *local = sdata->local;
 703         struct sk_buff *skb;
 704         struct sta_info *sta;
 705         struct ieee80211_ra_tid *ra_tid;
 706
 707         if (!ieee80211_sdata_running(sdata))
 708                 return;
 709
 710         if (local->scanning)
 711                 return;
 712
 713         /*
 714          * ieee80211_queue_work() should have picked up most cases,
 715          * here we'll pick the rest.
 716          */
 717         if (WARN(local->suspended,
 718                  "interface work scheduled while going to suspend\n"))
 719                 return;
 720
 721         /* first process frames */
 722         while ((skb = skb_dequeue(&sdata->skb_queue))) {
 723                 struct ieee80211_mgmt *mgmt = (void *)skb->data;
 724
 725                 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
 726                         ra_tid = (void *)&skb->cb;
 727                         ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
 728                                                  ra_tid->tid);
 729                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
 730                         ra_tid = (void *)&skb->cb;
 731                         ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
 732                                                 ra_tid->tid);
 733                 } else if (ieee80211_is_action(mgmt->frame_control) &&
 734                            mgmt->u.action.category == WLAN_CATEGORY_BACK) {
 735                         int len = skb->len;
 736
 737                         mutex_lock(&local->sta_mtx);
 738                         sta = sta_info_get_bss(sdata, mgmt->sa);
 739                         if (sta) {
 740                                 switch (mgmt->u.action.u.addba_req.action_code) {
 741                                 case WLAN_ACTION_ADDBA_REQ:
 742                                         ieee80211_process_addba_request(
 743                                                         local, sta, mgmt, len);
 744                                         break;
 745                                 case WLAN_ACTION_ADDBA_RESP:
 746                                         ieee80211_process_addba_resp(local, sta,
 747                                                                      mgmt, len);
 748                                         break;
 749                                 case WLAN_ACTION_DELBA:
 750                                         ieee80211_process_delba(sdata, sta,
 751                                                                 mgmt, len);
 752                                         break;
 753                                 default:
 754                                         WARN_ON(1);
 755                                         break;
 756                                 }
 757                         }
 758                         mutex_unlock(&local->sta_mtx);
 759                 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
 760                         struct ieee80211_hdr *hdr = (void *)mgmt;
 761                         /*
 762                          * So the frame isn't mgmt, but frame_control
 763                          * is at the right place anyway, of course, so
 764                          * the if statement is correct.
 765                          *
 766                          * Warn if we have other data frame types here,
 767                          * they must not get here.
 768                          */
 769                         WARN_ON(hdr->frame_control &
 770                                         cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
 771                         WARN_ON(!(hdr->seq_ctrl &
 772                                         cpu_to_le16(IEEE80211_SCTL_FRAG)));
 773                         /*
 774                          * This was a fragment of a frame, received while
 775                          * a block-ack session was active. That cannot be
 776                          * right, so terminate the session.
 777                          */
 778                         mutex_lock(&local->sta_mtx);
 779                         sta = sta_info_get_bss(sdata, mgmt->sa);
 780                         if (sta) {
 781                                 u16 tid = *ieee80211_get_qos_ctl(hdr) &
 782                                                 IEEE80211_QOS_CTL_TID_MASK;
 783
 784                                 __ieee80211_stop_rx_ba_session(
 785                                         sta, tid, WLAN_BACK_RECIPIENT,
 786                                         WLAN_REASON_QSTA_REQUIRE_SETUP,
 787                                         true);
 788                         }
 789                         mutex_unlock(&local->sta_mtx);
 790                 } else switch (sdata->vif.type) {
 791                 case NL80211_IFTYPE_STATION:
 792                         ieee80211_sta_rx_queued_mgmt(sdata, skb);
 793                         break;
 794                 case NL80211_IFTYPE_ADHOC:
 795                         ieee80211_ibss_rx_queued_mgmt(sdata, skb);
 796                         break;
 797                 case NL80211_IFTYPE_MESH_POINT:
 798                         if (!ieee80211_vif_is_mesh(&sdata->vif))
 799                                 break;
 800                         ieee80211_mesh_rx_queued_mgmt(sdata, skb);
 801                         break;
 802                 default:
 803                         WARN(1, "frame for unexpected interface type");
 804                         break;
 805                 }
 806
 807                 kfree_skb(skb);
 808         }
 809
 810         /* then other type-dependent work */
 811         switch (sdata->vif.type) {
 812         case NL80211_IFTYPE_STATION:
 813                 ieee80211_sta_work(sdata);
 814                 break;
 815         case NL80211_IFTYPE_ADHOC:
 816                 ieee80211_ibss_work(sdata);
 817                 break;
 818         case NL80211_IFTYPE_MESH_POINT:
 819                 if (!ieee80211_vif_is_mesh(&sdata->vif))
 820                         break;
 821                 ieee80211_mesh_work(sdata);
 822                 break;
 823         default:
 824                 break;
 825         }
 826 }
 827
 828
 829 /*
 830  * Helper function to initialise an interface to a specific type.
 831  */
 832 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
 833                                   enum nl80211_iftype type)
 834 {
 835         /* clear type-dependent union */
 836         memset(&sdata->u, 0, sizeof(sdata->u));
 837
 838         /* and set some type-dependent values */
 839         sdata->vif.type = type;
 840         sdata->vif.p2p = false;
 841         sdata->dev->netdev_ops = &ieee80211_dataif_ops;
 842         sdata->wdev.iftype = type;
 843
 844         sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
 845         sdata->control_port_no_encrypt = false;
 846
 847         /* only monitor differs */
 848         sdata->dev->type = ARPHRD_ETHER;
 849
 850         skb_queue_head_init(&sdata->skb_queue);
 851         INIT_WORK(&sdata->work, ieee80211_iface_work);
 852
 853         switch (type) {
 854         case NL80211_IFTYPE_P2P_GO:
 855                 type = NL80211_IFTYPE_AP;
 856                 sdata->vif.type = type;
 857                 sdata->vif.p2p = true;
 858                 /* fall through */
 859         case NL80211_IFTYPE_AP:
 860                 skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
 861                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
 862                 break;
 863         case NL80211_IFTYPE_P2P_CLIENT:
 864                 type = NL80211_IFTYPE_STATION;
 865                 sdata->vif.type = type;
 866                 sdata->vif.p2p = true;
 867                 /* fall through */
 868         case NL80211_IFTYPE_STATION:
 869                 ieee80211_sta_setup_sdata(sdata);
 870                 break;
 871         case NL80211_IFTYPE_ADHOC:
 872                 ieee80211_ibss_setup_sdata(sdata);
 873                 break;
 874         case NL80211_IFTYPE_MESH_POINT:
 875                 if (ieee80211_vif_is_mesh(&sdata->vif))
 876                         ieee80211_mesh_init_sdata(sdata);
 877                 break;
 878         case NL80211_IFTYPE_MONITOR:
 879                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
 880                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
 881                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
 882                                       MONITOR_FLAG_OTHER_BSS;
 883                 break;
 884         case NL80211_IFTYPE_WDS:
 885         case NL80211_IFTYPE_AP_VLAN:
 886                 break;
 887         case NL80211_IFTYPE_UNSPECIFIED:
 888         case NUM_NL80211_IFTYPES:
 889                 BUG();
 890                 break;
 891         }
 892
 893         ieee80211_debugfs_add_netdev(sdata);
 894 }
 895
 896 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
 897                                            enum nl80211_iftype type)
 898 {
 899         struct ieee80211_local *local = sdata->local;
 900         int ret, err;
 901         enum nl80211_iftype internal_type = type;
 902         bool p2p = false;
 903
 904         ASSERT_RTNL();
 905
 906         if (!local->ops->change_interface)
 907                 return -EBUSY;
 908
 909         switch (sdata->vif.type) {
 910         case NL80211_IFTYPE_AP:
 911         case NL80211_IFTYPE_STATION:
 912         case NL80211_IFTYPE_ADHOC:
 913                 /*
 914                  * Could maybe also all others here?
 915                  * Just not sure how that interacts
 916                  * with the RX/config path e.g. for
 917                  * mesh.
 918                  */
 919                 break;
 920         default:
 921                 return -EBUSY;
 922         }
 923
 924         switch (type) {
 925         case NL80211_IFTYPE_AP:
 926         case NL80211_IFTYPE_STATION:
 927         case NL80211_IFTYPE_ADHOC:
 928                 /*
 929                  * Could probably support everything
 930                  * but WDS here (WDS do_open can fail
 931                  * under memory pressure, which this
 932                  * code isn't prepared to handle).
 933                  */
 934                 break;
 935         case NL80211_IFTYPE_P2P_CLIENT:
 936                 p2p = true;
 937                 internal_type = NL80211_IFTYPE_STATION;
 938                 break;
 939         case NL80211_IFTYPE_P2P_GO:
 940                 p2p = true;
 941                 internal_type = NL80211_IFTYPE_AP;
 942                 break;
 943         default:
 944                 return -EBUSY;
 945         }
 946
 947         ret = ieee80211_check_concurrent_iface(sdata, internal_type);
 948         if (ret)
 949                 return ret;
 950
 951         ieee80211_do_stop(sdata, false);
 952
 953         ieee80211_teardown_sdata(sdata->dev);
 954
 955         ret = drv_change_interface(local, sdata, internal_type, p2p);
 956         if (ret)
 957                 type = sdata->vif.type;
 958
 959         ieee80211_setup_sdata(sdata, type);
 960
 961         err = ieee80211_do_open(sdata->dev, false);
 962         WARN(err, "type change: do_open returned %d", err);
 963
 964         return ret;
 965 }
 966
 967 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
 968                              enum nl80211_iftype type)
 969 {
 970         int ret;
 971
 972         ASSERT_RTNL();
 973
 974         if (type == ieee80211_vif_type_p2p(&sdata->vif))
 975                 return 0;
 976
 977         /* Setting ad-hoc mode on non-IBSS channel is not supported. */
 978         if (sdata->local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS &&
 979             type == NL80211_IFTYPE_ADHOC)
 980                 return -EOPNOTSUPP;
 981
 982         if (ieee80211_sdata_running(sdata)) {
 983                 ret = ieee80211_runtime_change_iftype(sdata, type);
 984                 if (ret)
 985                         return ret;
 986         } else {
 987                 /* Purge and reset type-dependent state. */
 988                 ieee80211_teardown_sdata(sdata->dev);
 989                 ieee80211_setup_sdata(sdata, type);
 990         }
 991
 992         /* reset some values that shouldn't be kept across type changes */
 993         sdata->vif.bss_conf.basic_rates =
 994                 ieee80211_mandatory_rates(sdata->local,
 995                         sdata->local->hw.conf.channel->band);
 996         sdata->drop_unencrypted = 0;
 997         if (type == NL80211_IFTYPE_STATION)
 998                 sdata->u.mgd.use_4addr = false;
 999
1000         return 0;
1001 }
1002
1003 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1004                                        struct net_device *dev,
1005                                        enum nl80211_iftype type)
1006 {
1007         struct ieee80211_sub_if_data *sdata;
1008         u64 mask, start, addr, val, inc;
1009         u8 *m;
1010         u8 tmp_addr[ETH_ALEN];
1011         int i;
1012
1013         /* default ... something at least */
1014         memcpy(dev->perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1015
1016         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1017             local->hw.wiphy->n_addresses <= 1)
1018                 return;
1019
1020
1021         mutex_lock(&local->iflist_mtx);
1022
1023         switch (type) {
1024         case NL80211_IFTYPE_MONITOR:
1025                 /* doesn't matter */
1026                 break;
1027         case NL80211_IFTYPE_WDS:
1028         case NL80211_IFTYPE_AP_VLAN:
1029                 /* match up with an AP interface */
1030                 list_for_each_entry(sdata, &local->interfaces, list) {
1031                         if (sdata->vif.type != NL80211_IFTYPE_AP)
1032                                 continue;
1033                         memcpy(dev->perm_addr, sdata->vif.addr, ETH_ALEN);
1034                         break;
1035                 }
1036                 /* keep default if no AP interface present */
1037                 break;
1038         default:
1039                 /* assign a new address if possible -- try n_addresses first */
1040                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1041                         bool used = false;
1042
1043                         list_for_each_entry(sdata, &local->interfaces, list) {
1044                                 if (memcmp(local->hw.wiphy->addresses[i].addr,
1045                                            sdata->vif.addr, ETH_ALEN) == 0) {
1046                                         used = true;
1047                                         break;
1048                                 }
1049                         }
1050
1051                         if (!used) {
1052                                 memcpy(dev->perm_addr,
1053                                        local->hw.wiphy->addresses[i].addr,
1054                                        ETH_ALEN);
1055                                 break;
1056                         }
1057                 }
1058
1059                 /* try mask if available */
1060                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1061                         break;
1062
1063                 m = local->hw.wiphy->addr_mask;
1064                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1065                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1066                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1067
1068                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1069                         /* not a contiguous mask ... not handled now! */
1070                         printk(KERN_DEBUG "not contiguous\n");
1071                         break;
1072                 }
1073
1074                 m = local->hw.wiphy->perm_addr;
1075                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1076                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1077                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1078
1079                 inc = 1ULL<<__ffs64(mask);
1080                 val = (start & mask);
1081                 addr = (start & ~mask) | (val & mask);
1082                 do {
1083                         bool used = false;
1084
1085                         tmp_addr[5] = addr >> 0*8;
1086                         tmp_addr[4] = addr >> 1*8;
1087                         tmp_addr[3] = addr >> 2*8;
1088                         tmp_addr[2] = addr >> 3*8;
1089                         tmp_addr[1] = addr >> 4*8;
1090                         tmp_addr[0] = addr >> 5*8;
1091
1092                         val += inc;
1093
1094                         list_for_each_entry(sdata, &local->interfaces, list) {
1095                                 if (memcmp(tmp_addr, sdata->vif.addr,
1096                                                         ETH_ALEN) == 0) {
1097                                         used = true;
1098                                         break;
1099                                 }
1100                         }
1101
1102                         if (!used) {
1103                                 memcpy(dev->perm_addr, tmp_addr, ETH_ALEN);
1104                                 break;
1105                         }
1106                         addr = (start & ~mask) | (val & mask);
1107                 } while (addr != start);
1108
1109                 break;
1110         }
1111
1112         mutex_unlock(&local->iflist_mtx);
1113 }
1114
1115 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1116                      struct net_device **new_dev, enum nl80211_iftype type,
1117                      struct vif_params *params)
1118 {
1119         struct net_device *ndev;
1120         struct ieee80211_sub_if_data *sdata = NULL;
1121         int ret, i;
1122
1123         ASSERT_RTNL();
1124
1125         ndev = alloc_netdev_mq(sizeof(*sdata) + local->hw.vif_data_size,
1126                                name, ieee80211_if_setup, local->hw.queues);
1127         if (!ndev)
1128                 return -ENOMEM;
1129         dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1130
1131         ndev->needed_headroom = local->tx_headroom +
1132                                 4*6 /* four MAC addresses */
1133                                 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1134                                 + 6 /* mesh */
1135                                 + 8 /* rfc1042/bridge tunnel */
1136                                 - ETH_HLEN /* ethernet hard_header_len */
1137                                 + IEEE80211_ENCRYPT_HEADROOM;
1138         ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1139
1140         ret = dev_alloc_name(ndev, ndev->name);
1141         if (ret < 0)
1142                 goto fail;
1143
1144         ieee80211_assign_perm_addr(local, ndev, type);
1145         memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1146         SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1147
1148         /* don't use IEEE80211_DEV_TO_SUB_IF because it checks too much */
1149         sdata = netdev_priv(ndev);
1150         ndev->ieee80211_ptr = &sdata->wdev;
1151         memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1152         memcpy(sdata->name, ndev->name, IFNAMSIZ);
1153
1154         /* initialise type-independent data */
1155         sdata->wdev.wiphy = local->hw.wiphy;
1156         sdata->local = local;
1157         sdata->dev = ndev;
1158 #ifdef CONFIG_INET
1159         sdata->arp_filter_state = true;
1160 #endif
1161
1162         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1163                 skb_queue_head_init(&sdata->fragments[i].skb_list);
1164
1165         INIT_LIST_HEAD(&sdata->key_list);
1166
1167         for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1168                 struct ieee80211_supported_band *sband;
1169                 sband = local->hw.wiphy->bands[i];
1170                 sdata->rc_rateidx_mask[i] =
1171                         sband ? (1 << sband->n_bitrates) - 1 : 0;
1172         }
1173
1174         /* setup type-dependent data */
1175         ieee80211_setup_sdata(sdata, type);
1176
1177         if (params) {
1178                 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1179                 if (type == NL80211_IFTYPE_STATION)
1180                         sdata->u.mgd.use_4addr = params->use_4addr;
1181         }
1182
1183         ret = register_netdevice(ndev);
1184         if (ret)
1185                 goto fail;
1186
1187         mutex_lock(&local->iflist_mtx);
1188         list_add_tail_rcu(&sdata->list, &local->interfaces);
1189         mutex_unlock(&local->iflist_mtx);
1190
1191         if (new_dev)
1192                 *new_dev = ndev;
1193
1194         return 0;
1195
1196  fail:
1197         free_netdev(ndev);
1198         return ret;
1199 }
1200
1201 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1202 {
1203         ASSERT_RTNL();
1204
1205         mutex_lock(&sdata->local->iflist_mtx);
1206         list_del_rcu(&sdata->list);
1207         mutex_unlock(&sdata->local->iflist_mtx);
1208
1209         synchronize_rcu();
1210         unregister_netdevice(sdata->dev);
1211 }
1212
1213 /*
1214  * Remove all interfaces, may only be called at hardware unregistration
1215  * time because it doesn't do RCU-safe list removals.
1216  */
1217 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1218 {
1219         struct ieee80211_sub_if_data *sdata, *tmp;
1220         LIST_HEAD(unreg_list);
1221
1222         ASSERT_RTNL();
1223
1224         mutex_lock(&local->iflist_mtx);
1225         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1226                 list_del(&sdata->list);
1227
1228                 unregister_netdevice_queue(sdata->dev, &unreg_list);
1229         }
1230         mutex_unlock(&local->iflist_mtx);
1231         unregister_netdevice_many(&unreg_list);
1232 }
1233
1234 static u32 ieee80211_idle_off(struct ieee80211_local *local,
1235                               const char *reason)
1236 {
1237         if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
1238                 return 0;
1239
1240 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1241         wiphy_debug(local->hw.wiphy, "device no longer idle - %s\n", reason);
1242 #endif
1243
1244         local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
1245         return IEEE80211_CONF_CHANGE_IDLE;
1246 }
1247
1248 static u32 ieee80211_idle_on(struct ieee80211_local *local)
1249 {
1250         if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
1251                 return 0;
1252
1253 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1254         wiphy_debug(local->hw.wiphy, "device now idle\n");
1255 #endif
1256
1257         drv_flush(local, false);
1258
1259         local->hw.conf.flags |= IEEE80211_CONF_IDLE;
1260         return IEEE80211_CONF_CHANGE_IDLE;
1261 }
1262
1263 u32 __ieee80211_recalc_idle(struct ieee80211_local *local)
1264 {
1265         struct ieee80211_sub_if_data *sdata;
1266         int count = 0;
1267         bool working = false, scanning = false, hw_roc = false;
1268         struct ieee80211_work *wk;
1269         unsigned int led_trig_start = 0, led_trig_stop = 0;
1270
1271 #ifdef CONFIG_PROVE_LOCKING
1272         WARN_ON(debug_locks && !lockdep_rtnl_is_held() &&
1273                 !lockdep_is_held(&local->iflist_mtx));
1274 #endif
1275         lockdep_assert_held(&local->mtx);
1276
1277         list_for_each_entry(sdata, &local->interfaces, list) {
1278                 if (!ieee80211_sdata_running(sdata)) {
1279                         sdata->vif.bss_conf.idle = true;
1280                         continue;
1281                 }
1282
1283                 sdata->old_idle = sdata->vif.bss_conf.idle;
1284
1285                 /* do not count disabled managed interfaces */
1286                 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1287                     !sdata->u.mgd.associated) {
1288                         sdata->vif.bss_conf.idle = true;
1289                         continue;
1290                 }
1291                 /* do not count unused IBSS interfaces */
1292                 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
1293                     !sdata->u.ibss.ssid_len) {
1294                         sdata->vif.bss_conf.idle = true;
1295                         continue;
1296                 }
1297                 /* count everything else */
1298                 count++;
1299         }
1300
1301         list_for_each_entry(wk, &local->work_list, list) {
1302                 working = true;
1303                 wk->sdata->vif.bss_conf.idle = false;
1304         }
1305
1306         if (local->scan_sdata) {
1307                 scanning = true;
1308                 local->scan_sdata->vif.bss_conf.idle = false;
1309         }
1310
1311         if (local->hw_roc_channel)
1312                 hw_roc = true;
1313
1314         list_for_each_entry(sdata, &local->interfaces, list) {
1315                 if (sdata->old_idle == sdata->vif.bss_conf.idle)
1316                         continue;
1317                 if (!ieee80211_sdata_running(sdata))
1318                         continue;
1319                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_IDLE);
1320         }
1321
1322         if (working || scanning || hw_roc)
1323                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
1324         else
1325                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
1326
1327         if (count)
1328                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
1329         else
1330                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
1331
1332         ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
1333
1334         if (hw_roc)
1335                 return ieee80211_idle_off(local, "hw remain-on-channel");
1336         if (working)
1337                 return ieee80211_idle_off(local, "working");
1338         if (scanning)
1339                 return ieee80211_idle_off(local, "scanning");
1340         if (!count)
1341                 return ieee80211_idle_on(local);
1342         else
1343                 return ieee80211_idle_off(local, "in use");
1344
1345         return 0;
1346 }
1347
1348 void ieee80211_recalc_idle(struct ieee80211_local *local)
1349 {
1350         u32 chg;
1351
1352         mutex_lock(&local->iflist_mtx);
1353         chg = __ieee80211_recalc_idle(local);
1354         mutex_unlock(&local->iflist_mtx);
1355         if (chg)
1356                 ieee80211_hw_config(local, chg);
1357 }
1358
1359 static int netdev_notify(struct notifier_block *nb,
1360                          unsigned long state,
1361                          void *ndev)
1362 {
1363         struct net_device *dev = ndev;
1364         struct ieee80211_sub_if_data *sdata;
1365
1366         if (state != NETDEV_CHANGENAME)
1367                 return 0;
1368
1369         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1370                 return 0;
1371
1372         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1373                 return 0;
1374
1375         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1376
1377         memcpy(sdata->name, dev->name, IFNAMSIZ);
1378
1379         ieee80211_debugfs_rename_netdev(sdata);
1380         return 0;
1381 }
1382
1383 static struct notifier_block mac80211_netdev_notifier = {
1384         .notifier_call = netdev_notify,
1385 };
1386
1387 int ieee80211_iface_init(void)
1388 {
1389         return register_netdevice_notifier(&mac80211_netdev_notifier);
1390 }
1391
1392 void ieee80211_iface_exit(void)
1393 {
1394         unregister_netdevice_notifier(&mac80211_netdev_notifier);
1395 }