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
  28 /**
  29  * DOC: Interface list locking
  30  *
  31  * The interface list in each struct ieee80211_local is protected
  32  * three-fold:
  33  *
  34  * (1) modifications may only be done under the RTNL
  35  * (2) modifications and readers are protected against each other by
  36  *     the iflist_mtx.
  37  * (3) modifications are done in an RCU manner so atomic readers
  38  *     can traverse the list in RCU-safe blocks.
  39  *
  40  * As a consequence, reads (traversals) of the list can be protected
  41  * by either the RTNL, the iflist_mtx or RCU.
  42  */
  43
  44
  45 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
  46 {
  47         int meshhdrlen;
  48         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
  49
  50         meshhdrlen = (sdata->vif.type == NL80211_IFTYPE_MESH_POINT) ? 5 : 0;
  51
  52         /* FIX: what would be proper limits for MTU?
  53          * This interface uses 802.3 frames. */
  54         if (new_mtu < 256 ||
  55             new_mtu > IEEE80211_MAX_DATA_LEN - 24 - 6 - meshhdrlen) {
  56                 return -EINVAL;
  57         }
  58
  59 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
  60         printk(KERN_DEBUG "%s: setting MTU %d\n", dev->name, new_mtu);
  61 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
  62         dev->mtu = new_mtu;
  63         return 0;
  64 }
  65
  66 static int ieee80211_change_mac(struct net_device *dev, void *addr)
  67 {
  68         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
  69         struct sockaddr *sa = addr;
  70         int ret;
  71
  72         if (ieee80211_sdata_running(sdata))
  73                 return -EBUSY;
  74
  75         ret = eth_mac_addr(dev, sa);
  76
  77         if (ret == 0)
  78                 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
  79
  80         return ret;
  81 }
  82
  83 static inline int identical_mac_addr_allowed(int type1, int type2)
  84 {
  85         return type1 == NL80211_IFTYPE_MONITOR ||
  86                 type2 == NL80211_IFTYPE_MONITOR ||
  87                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
  88                 (type1 == NL80211_IFTYPE_WDS &&
  89                         (type2 == NL80211_IFTYPE_WDS ||
  90                          type2 == NL80211_IFTYPE_AP)) ||
  91                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
  92                 (type1 == NL80211_IFTYPE_AP_VLAN &&
  93                         (type2 == NL80211_IFTYPE_AP ||
  94                          type2 == NL80211_IFTYPE_AP_VLAN));
  95 }
  96
  97 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
  98                                             enum nl80211_iftype iftype)
  99 {
 100         struct ieee80211_local *local = sdata->local;
 101         struct ieee80211_sub_if_data *nsdata;
 102         struct net_device *dev = sdata->dev;
 103
 104         ASSERT_RTNL();
 105
 106         /* we hold the RTNL here so can safely walk the list */
 107         list_for_each_entry(nsdata, &local->interfaces, list) {
 108                 struct net_device *ndev = nsdata->dev;
 109
 110                 if (ndev != dev && ieee80211_sdata_running(nsdata)) {
 111                         /*
 112                          * Allow only a single IBSS interface to be up at any
 113                          * time. This is restricted because beacon distribution
 114                          * cannot work properly if both are in the same IBSS.
 115                          *
 116                          * To remove this restriction we'd have to disallow them
 117                          * from setting the same SSID on different IBSS interfaces
 118                          * belonging to the same hardware. Then, however, we're
 119                          * faced with having to adopt two different TSF timers...
 120                          */
 121                         if (iftype == NL80211_IFTYPE_ADHOC &&
 122                             nsdata->vif.type == NL80211_IFTYPE_ADHOC)
 123                                 return -EBUSY;
 124
 125                         /*
 126                          * The remaining checks are only performed for interfaces
 127                          * with the same MAC address.
 128                          */
 129                         if (compare_ether_addr(dev->dev_addr, ndev->dev_addr))
 130                                 continue;
 131
 132                         /*
 133                          * check whether it may have the same address
 134                          */
 135                         if (!identical_mac_addr_allowed(iftype,
 136                                                         nsdata->vif.type))
 137                                 return -ENOTUNIQ;
 138
 139                         /*
 140                          * can only add VLANs to enabled APs
 141                          */
 142                         if (iftype == NL80211_IFTYPE_AP_VLAN &&
 143                             nsdata->vif.type == NL80211_IFTYPE_AP)
 144                                 sdata->bss = &nsdata->u.ap;
 145                 }
 146         }
 147
 148         return 0;
 149 }
 150
 151 /*
 152  * NOTE: Be very careful when changing this function, it must NOT return
 153  * an error on interface type changes that have been pre-checked, so most
 154  * checks should be in ieee80211_check_concurrent_iface.
 155  */
 156 static int ieee80211_do_open(struct net_device *dev, bool coming_up)
 157 {
 158         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 159         struct ieee80211_local *local = sdata->local;
 160         struct sta_info *sta;
 161         u32 changed = 0;
 162         int res;
 163         u32 hw_reconf_flags = 0;
 164
 165         switch (sdata->vif.type) {
 166         case NL80211_IFTYPE_WDS:
 167                 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
 168                         return -ENOLINK;
 169                 break;
 170         case NL80211_IFTYPE_AP_VLAN:
 171                 if (!sdata->bss)
 172                         return -ENOLINK;
 173                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
 174                 break;
 175         case NL80211_IFTYPE_AP:
 176                 sdata->bss = &sdata->u.ap;
 177                 break;
 178         case NL80211_IFTYPE_MESH_POINT:
 179                 if (!ieee80211_vif_is_mesh(&sdata->vif))
 180                         break;
 181                 /* mesh ifaces must set allmulti to forward mcast traffic */
 182                 atomic_inc(&local->iff_allmultis);
 183                 break;
 184         case NL80211_IFTYPE_STATION:
 185         case NL80211_IFTYPE_MONITOR:
 186         case NL80211_IFTYPE_ADHOC:
 187                 /* no special treatment */
 188                 break;
 189         case NL80211_IFTYPE_UNSPECIFIED:
 190         case NUM_NL80211_IFTYPES:
 191                 /* cannot happen */
 192                 WARN_ON(1);
 193                 break;
 194         }
 195
 196         if (local->open_count == 0) {
 197                 res = drv_start(local);
 198                 if (res)
 199                         goto err_del_bss;
 200                 if (local->ops->napi_poll)
 201                         napi_enable(&local->napi);
 202                 /* we're brought up, everything changes */
 203                 hw_reconf_flags = ~0;
 204                 ieee80211_led_radio(local, true);
 205         }
 206
 207         /*
 208          * Copy the hopefully now-present MAC address to
 209          * this interface, if it has the special null one.
 210          */
 211         if (is_zero_ether_addr(dev->dev_addr)) {
 212                 memcpy(dev->dev_addr,
 213                        local->hw.wiphy->perm_addr,
 214                        ETH_ALEN);
 215                 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
 216
 217                 if (!is_valid_ether_addr(dev->dev_addr)) {
 218                         if (!local->open_count)
 219                                 drv_stop(local);
 220                         return -EADDRNOTAVAIL;
 221                 }
 222         }
 223
 224         switch (sdata->vif.type) {
 225         case NL80211_IFTYPE_AP_VLAN:
 226                 /* no need to tell driver */
 227                 break;
 228         case NL80211_IFTYPE_MONITOR:
 229                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 230                         local->cooked_mntrs++;
 231                         break;
 232                 }
 233
 234                 /* must be before the call to ieee80211_configure_filter */
 235                 local->monitors++;
 236                 if (local->monitors == 1) {
 237                         local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
 238                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 239                 }
 240
 241                 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
 242                         local->fif_fcsfail++;
 243                 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
 244                         local->fif_plcpfail++;
 245                 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL) {
 246                         local->fif_control++;
 247                         local->fif_pspoll++;
 248                 }
 249                 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
 250                         local->fif_other_bss++;
 251
 252                 ieee80211_configure_filter(local);
 253
 254                 netif_carrier_on(dev);
 255                 break;
 256         default:
 257                 if (coming_up) {
 258                         res = drv_add_interface(local, &sdata->vif);
 259                         if (res)
 260                                 goto err_stop;
 261                 }
 262
 263                 if (ieee80211_vif_is_mesh(&sdata->vif)) {
 264                         local->fif_other_bss++;
 265                         ieee80211_configure_filter(local);
 266
 267                         ieee80211_start_mesh(sdata);
 268                 } else if (sdata->vif.type == NL80211_IFTYPE_AP) {
 269                         local->fif_pspoll++;
 270
 271                         ieee80211_configure_filter(local);
 272                 }
 273
 274                 changed |= ieee80211_reset_erp_info(sdata);
 275                 ieee80211_bss_info_change_notify(sdata, changed);
 276
 277                 if (sdata->vif.type == NL80211_IFTYPE_STATION)
 278                         netif_carrier_off(dev);
 279                 else
 280                         netif_carrier_on(dev);
 281         }
 282
 283         if (sdata->vif.type == NL80211_IFTYPE_WDS) {
 284                 /* Create STA entry for the WDS peer */
 285                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
 286                                      GFP_KERNEL);
 287                 if (!sta) {
 288                         res = -ENOMEM;
 289                         goto err_del_interface;
 290                 }
 291
 292                 /* no locking required since STA is not live yet */
 293                 sta->flags |= WLAN_STA_AUTHORIZED;
 294
 295                 res = sta_info_insert(sta);
 296                 if (res) {
 297                         /* STA has been freed */
 298                         goto err_del_interface;
 299                 }
 300         }
 301
 302         /*
 303          * set_multicast_list will be invoked by the networking core
 304          * which will check whether any increments here were done in
 305          * error and sync them down to the hardware as filter flags.
 306          */
 307         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 308                 atomic_inc(&local->iff_allmultis);
 309
 310         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 311                 atomic_inc(&local->iff_promiscs);
 312
 313         mutex_lock(&local->mtx);
 314         hw_reconf_flags |= __ieee80211_recalc_idle(local);
 315         mutex_unlock(&local->mtx);
 316
 317         if (coming_up)
 318                 local->open_count++;
 319
 320         if (hw_reconf_flags) {
 321                 ieee80211_hw_config(local, hw_reconf_flags);
 322                 /*
 323                  * set default queue parameters so drivers don't
 324                  * need to initialise the hardware if the hardware
 325                  * doesn't start up with sane defaults
 326                  */
 327                 ieee80211_set_wmm_default(sdata);
 328         }
 329
 330         ieee80211_recalc_ps(local, -1);
 331
 332         netif_tx_start_all_queues(dev);
 333
 334         set_bit(SDATA_STATE_RUNNING, &sdata->state);
 335
 336         return 0;
 337  err_del_interface:
 338         drv_remove_interface(local, &sdata->vif);
 339  err_stop:
 340         if (!local->open_count)
 341                 drv_stop(local);
 342  err_del_bss:
 343         sdata->bss = NULL;
 344         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
 345                 list_del(&sdata->u.vlan.list);
 346         return res;
 347 }
 348
 349 static int ieee80211_open(struct net_device *dev)
 350 {
 351         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 352         int err;
 353
 354         /* fail early if user set an invalid address */
 355         if (!is_zero_ether_addr(dev->dev_addr) &&
 356             !is_valid_ether_addr(dev->dev_addr))
 357                 return -EADDRNOTAVAIL;
 358
 359         err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
 360         if (err)
 361                 return err;
 362
 363         return ieee80211_do_open(dev, true);
 364 }
 365
 366 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
 367                               bool going_down)
 368 {
 369         struct ieee80211_local *local = sdata->local;
 370         unsigned long flags;
 371         struct sk_buff *skb, *tmp;
 372         u32 hw_reconf_flags = 0;
 373         int i;
 374
 375         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 376
 377         /*
 378          * Stop TX on this interface first.
 379          */
 380         netif_tx_stop_all_queues(sdata->dev);
 381
 382         /*
 383          * Purge work for this interface.
 384          */
 385         ieee80211_work_purge(sdata);
 386
 387         /*
 388          * Remove all stations associated with this interface.
 389          *
 390          * This must be done before calling ops->remove_interface()
 391          * because otherwise we can later invoke ops->sta_notify()
 392          * whenever the STAs are removed, and that invalidates driver
 393          * assumptions about always getting a vif pointer that is valid
 394          * (because if we remove a STA after ops->remove_interface()
 395          * the driver will have removed the vif info already!)
 396          *
 397          * This is relevant only in AP, WDS and mesh modes, since in
 398          * all other modes we've already removed all stations when
 399          * disconnecting etc.
 400          */
 401         sta_info_flush(local, sdata);
 402
 403         /*
 404          * Don't count this interface for promisc/allmulti while it
 405          * is down. dev_mc_unsync() will invoke set_multicast_list
 406          * on the master interface which will sync these down to the
 407          * hardware as filter flags.
 408          */
 409         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 410                 atomic_dec(&local->iff_allmultis);
 411
 412         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 413                 atomic_dec(&local->iff_promiscs);
 414
 415         if (sdata->vif.type == NL80211_IFTYPE_AP)
 416                 local->fif_pspoll--;
 417
 418         netif_addr_lock_bh(sdata->dev);
 419         spin_lock_bh(&local->filter_lock);
 420         __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
 421                          sdata->dev->addr_len);
 422         spin_unlock_bh(&local->filter_lock);
 423         netif_addr_unlock_bh(sdata->dev);
 424
 425         ieee80211_configure_filter(local);
 426
 427         del_timer_sync(&local->dynamic_ps_timer);
 428         cancel_work_sync(&local->dynamic_ps_enable_work);
 429
 430         /* APs need special treatment */
 431         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 432                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
 433                 struct beacon_data *old_beacon = sdata->u.ap.beacon;
 434
 435                 /* sdata_running will return false, so this will disable */
 436                 ieee80211_bss_info_change_notify(sdata,
 437                                                  BSS_CHANGED_BEACON_ENABLED);
 438
 439                 /* remove beacon */
 440                 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
 441                 synchronize_rcu();
 442                 kfree(old_beacon);
 443
 444                 /* free all potentially still buffered bcast frames */
 445                 while ((skb = skb_dequeue(&sdata->u.ap.ps_bc_buf))) {
 446                         local->total_ps_buffered--;
 447                         dev_kfree_skb(skb);
 448                 }
 449
 450                 /* down all dependent devices, that is VLANs */
 451                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
 452                                          u.vlan.list)
 453                         dev_close(vlan->dev);
 454                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
 455         }
 456
 457         if (going_down)
 458                 local->open_count--;
 459
 460         switch (sdata->vif.type) {
 461         case NL80211_IFTYPE_AP_VLAN:
 462                 list_del(&sdata->u.vlan.list);
 463                 /* no need to tell driver */
 464                 break;
 465         case NL80211_IFTYPE_MONITOR:
 466                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 467                         local->cooked_mntrs--;
 468                         break;
 469                 }
 470
 471                 local->monitors--;
 472                 if (local->monitors == 0) {
 473                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
 474                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 475                 }
 476
 477                 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
 478                         local->fif_fcsfail--;
 479                 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
 480                         local->fif_plcpfail--;
 481                 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL) {
 482                         local->fif_pspoll--;
 483                         local->fif_control--;
 484                 }
 485                 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
 486                         local->fif_other_bss--;
 487
 488                 ieee80211_configure_filter(local);
 489                 break;
 490         case NL80211_IFTYPE_MESH_POINT:
 491                 if (ieee80211_vif_is_mesh(&sdata->vif)) {
 492                         /* other_bss and allmulti are always set on mesh
 493                          * ifaces */
 494                         local->fif_other_bss--;
 495                         atomic_dec(&local->iff_allmultis);
 496
 497                         ieee80211_configure_filter(local);
 498
 499                         ieee80211_stop_mesh(sdata);
 500                 }
 501                 /* fall through */
 502         default:
 503                 flush_work(&sdata->work);
 504                 /*
 505                  * When we get here, the interface is marked down.
 506                  * Call synchronize_rcu() to wait for the RX path
 507                  * should it be using the interface and enqueuing
 508                  * frames at this very time on another CPU.
 509                  */
 510                 synchronize_rcu();
 511                 skb_queue_purge(&sdata->skb_queue);
 512
 513                 if (local->scan_sdata == sdata)
 514                         ieee80211_scan_cancel(local);
 515
 516                 /*
 517                  * Disable beaconing here for mesh only, AP and IBSS
 518                  * are already taken care of.
 519                  */
 520                 if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
 521                         ieee80211_bss_info_change_notify(sdata,
 522                                 BSS_CHANGED_BEACON_ENABLED);
 523
 524                 /*
 525                  * Free all remaining keys, there shouldn't be any,
 526                  * except maybe group keys in AP more or WDS?
 527                  */
 528                 ieee80211_free_keys(sdata);
 529
 530                 if (going_down)
 531                         drv_remove_interface(local, &sdata->vif);
 532         }
 533
 534         sdata->bss = NULL;
 535
 536         mutex_lock(&local->mtx);
 537         hw_reconf_flags |= __ieee80211_recalc_idle(local);
 538         mutex_unlock(&local->mtx);
 539
 540         ieee80211_recalc_ps(local, -1);
 541
 542         if (local->open_count == 0) {
 543                 if (local->ops->napi_poll)
 544                         napi_disable(&local->napi);
 545                 ieee80211_clear_tx_pending(local);
 546                 ieee80211_stop_device(local);
 547
 548                 /* no reconfiguring after stop! */
 549                 hw_reconf_flags = 0;
 550         }
 551
 552         /* do after stop to avoid reconfiguring when we stop anyway */
 553         if (hw_reconf_flags)
 554                 ieee80211_hw_config(local, hw_reconf_flags);
 555
 556         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 557         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 558                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
 559                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 560                         if (info->control.vif == &sdata->vif) {
 561                                 __skb_unlink(skb, &local->pending[i]);
 562                                 dev_kfree_skb_irq(skb);
 563                         }
 564                 }
 565         }
 566         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 567 }
 568
 569 static int ieee80211_stop(struct net_device *dev)
 570 {
 571         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 572
 573         ieee80211_do_stop(sdata, true);
 574
 575         return 0;
 576 }
 577
 578 static void ieee80211_set_multicast_list(struct net_device *dev)
 579 {
 580         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 581         struct ieee80211_local *local = sdata->local;
 582         int allmulti, promisc, sdata_allmulti, sdata_promisc;
 583
 584         allmulti = !!(dev->flags & IFF_ALLMULTI);
 585         promisc = !!(dev->flags & IFF_PROMISC);
 586         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
 587         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
 588
 589         if (allmulti != sdata_allmulti) {
 590                 if (dev->flags & IFF_ALLMULTI)
 591                         atomic_inc(&local->iff_allmultis);
 592                 else
 593                         atomic_dec(&local->iff_allmultis);
 594                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
 595         }
 596
 597         if (promisc != sdata_promisc) {
 598                 if (dev->flags & IFF_PROMISC)
 599                         atomic_inc(&local->iff_promiscs);
 600                 else
 601                         atomic_dec(&local->iff_promiscs);
 602                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
 603         }
 604         spin_lock_bh(&local->filter_lock);
 605         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
 606         spin_unlock_bh(&local->filter_lock);
 607         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
 608 }
 609
 610 /*
 611  * Called when the netdev is removed or, by the code below, before
 612  * the interface type changes.
 613  */
 614 static void ieee80211_teardown_sdata(struct net_device *dev)
 615 {
 616         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 617         struct ieee80211_local *local = sdata->local;
 618         int flushed;
 619         int i;
 620
 621         /* free extra data */
 622         ieee80211_free_keys(sdata);
 623
 624         ieee80211_debugfs_remove_netdev(sdata);
 625
 626         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
 627                 __skb_queue_purge(&sdata->fragments[i].skb_list);
 628         sdata->fragment_next = 0;
 629
 630         if (ieee80211_vif_is_mesh(&sdata->vif))
 631                 mesh_rmc_free(sdata);
 632
 633         flushed = sta_info_flush(local, sdata);
 634         WARN_ON(flushed);
 635 }
 636
 637 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
 638                                          struct sk_buff *skb)
 639 {
 640         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
 641 }
 642
 643 static const struct net_device_ops ieee80211_dataif_ops = {
 644         .ndo_open               = ieee80211_open,
 645         .ndo_stop               = ieee80211_stop,
 646         .ndo_uninit             = ieee80211_teardown_sdata,
 647         .ndo_start_xmit         = ieee80211_subif_start_xmit,
 648         .ndo_set_multicast_list = ieee80211_set_multicast_list,
 649         .ndo_change_mtu         = ieee80211_change_mtu,
 650         .ndo_set_mac_address    = ieee80211_change_mac,
 651         .ndo_select_queue       = ieee80211_netdev_select_queue,
 652 };
 653
 654 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
 655                                           struct sk_buff *skb)
 656 {
 657         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 658         struct ieee80211_local *local = sdata->local;
 659         struct ieee80211_hdr *hdr;
 660         struct ieee80211_radiotap_header *rtap = (void *)skb->data;
 661         u8 *p;
 662
 663         if (local->hw.queues < 4)
 664                 return 0;
 665
 666         if (skb->len < 4 ||
 667             skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
 668                 return 0; /* doesn't matter, frame will be dropped */
 669
 670         hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
 671
 672         if (!ieee80211_is_data(hdr->frame_control)) {
 673                 skb->priority = 7;
 674                 return ieee802_1d_to_ac[skb->priority];
 675         }
 676         if (!ieee80211_is_data_qos(hdr->frame_control)) {
 677                 skb->priority = 0;
 678                 return ieee802_1d_to_ac[skb->priority];
 679         }
 680
 681         p = ieee80211_get_qos_ctl(hdr);
 682         skb->priority = *p & IEEE80211_QOS_CTL_TAG1D_MASK;
 683
 684         return ieee80211_downgrade_queue(local, skb);
 685 }
 686
 687 static const struct net_device_ops ieee80211_monitorif_ops = {
 688         .ndo_open               = ieee80211_open,
 689         .ndo_stop               = ieee80211_stop,
 690         .ndo_uninit             = ieee80211_teardown_sdata,
 691         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
 692         .ndo_set_multicast_list = ieee80211_set_multicast_list,
 693         .ndo_change_mtu         = ieee80211_change_mtu,
 694         .ndo_set_mac_address    = eth_mac_addr,
 695         .ndo_select_queue       = ieee80211_monitor_select_queue,
 696 };
 697
 698 static void ieee80211_if_setup(struct net_device *dev)
 699 {
 700         ether_setup(dev);
 701         dev->netdev_ops = &ieee80211_dataif_ops;
 702         dev->destructor = free_netdev;
 703 }
 704
 705 static void ieee80211_iface_work(struct work_struct *work)
 706 {
 707         struct ieee80211_sub_if_data *sdata =
 708                 container_of(work, struct ieee80211_sub_if_data, work);
 709         struct ieee80211_local *local = sdata->local;
 710         struct sk_buff *skb;
 711         struct sta_info *sta;
 712         struct ieee80211_ra_tid *ra_tid;
 713
 714         if (!ieee80211_sdata_running(sdata))
 715                 return;
 716
 717         if (local->scanning)
 718                 return;
 719
 720         /*
 721          * ieee80211_queue_work() should have picked up most cases,
 722          * here we'll pick the rest.
 723          */
 724         if (WARN(local->suspended,
 725                  "interface work scheduled while going to suspend\n"))
 726                 return;
 727
 728         /* first process frames */
 729         while ((skb = skb_dequeue(&sdata->skb_queue))) {
 730                 struct ieee80211_mgmt *mgmt = (void *)skb->data;
 731
 732                 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
 733                         ra_tid = (void *)&skb->cb;
 734                         ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
 735                                                  ra_tid->tid);
 736                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
 737                         ra_tid = (void *)&skb->cb;
 738                         ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
 739                                                 ra_tid->tid);
 740                 } else if (ieee80211_is_action(mgmt->frame_control) &&
 741                            mgmt->u.action.category == WLAN_CATEGORY_BACK) {
 742                         int len = skb->len;
 743
 744                         mutex_lock(&local->sta_mtx);
 745                         sta = sta_info_get_bss(sdata, mgmt->sa);
 746                         if (sta) {
 747                                 switch (mgmt->u.action.u.addba_req.action_code) {
 748                                 case WLAN_ACTION_ADDBA_REQ:
 749                                         ieee80211_process_addba_request(
 750                                                         local, sta, mgmt, len);
 751                                         break;
 752                                 case WLAN_ACTION_ADDBA_RESP:
 753                                         ieee80211_process_addba_resp(local, sta,
 754                                                                      mgmt, len);
 755                                         break;
 756                                 case WLAN_ACTION_DELBA:
 757                                         ieee80211_process_delba(sdata, sta,
 758                                                                 mgmt, len);
 759                                         break;
 760                                 default:
 761                                         WARN_ON(1);
 762                                         break;
 763                                 }
 764                         }
 765                         mutex_unlock(&local->sta_mtx);
 766                 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
 767                         struct ieee80211_hdr *hdr = (void *)mgmt;
 768                         /*
 769                          * So the frame isn't mgmt, but frame_control
 770                          * is at the right place anyway, of course, so
 771                          * the if statement is correct.
 772                          *
 773                          * Warn if we have other data frame types here,
 774                          * they must not get here.
 775                          */
 776                         WARN_ON(hdr->frame_control &
 777                                         cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
 778                         WARN_ON(!(hdr->seq_ctrl &
 779                                         cpu_to_le16(IEEE80211_SCTL_FRAG)));
 780                         /*
 781                          * This was a fragment of a frame, received while
 782                          * a block-ack session was active. That cannot be
 783                          * right, so terminate the session.
 784                          */
 785                         mutex_lock(&local->sta_mtx);
 786                         sta = sta_info_get_bss(sdata, mgmt->sa);
 787                         if (sta) {
 788                                 u16 tid = *ieee80211_get_qos_ctl(hdr) &
 789                                                 IEEE80211_QOS_CTL_TID_MASK;
 790
 791                                 __ieee80211_stop_rx_ba_session(
 792                                         sta, tid, WLAN_BACK_RECIPIENT,
 793                                         WLAN_REASON_QSTA_REQUIRE_SETUP);
 794                         }
 795                         mutex_unlock(&local->sta_mtx);
 796                 } else switch (sdata->vif.type) {
 797                 case NL80211_IFTYPE_STATION:
 798                         ieee80211_sta_rx_queued_mgmt(sdata, skb);
 799                         break;
 800                 case NL80211_IFTYPE_ADHOC:
 801                         ieee80211_ibss_rx_queued_mgmt(sdata, skb);
 802                         break;
 803                 case NL80211_IFTYPE_MESH_POINT:
 804                         if (!ieee80211_vif_is_mesh(&sdata->vif))
 805                                 break;
 806                         ieee80211_mesh_rx_queued_mgmt(sdata, skb);
 807                         break;
 808                 default:
 809                         WARN(1, "frame for unexpected interface type");
 810                         break;
 811                 }
 812
 813                 kfree_skb(skb);
 814         }
 815
 816         /* then other type-dependent work */
 817         switch (sdata->vif.type) {
 818         case NL80211_IFTYPE_STATION:
 819                 ieee80211_sta_work(sdata);
 820                 break;
 821         case NL80211_IFTYPE_ADHOC:
 822                 ieee80211_ibss_work(sdata);
 823                 break;
 824         case NL80211_IFTYPE_MESH_POINT:
 825                 if (!ieee80211_vif_is_mesh(&sdata->vif))
 826                         break;
 827                 ieee80211_mesh_work(sdata);
 828                 break;
 829         default:
 830                 break;
 831         }
 832 }
 833
 834
 835 /*
 836  * Helper function to initialise an interface to a specific type.
 837  */
 838 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
 839                                   enum nl80211_iftype type)
 840 {
 841         /* clear type-dependent union */
 842         memset(&sdata->u, 0, sizeof(sdata->u));
 843
 844         /* and set some type-dependent values */
 845         sdata->vif.type = type;
 846         sdata->dev->netdev_ops = &ieee80211_dataif_ops;
 847         sdata->wdev.iftype = type;
 848
 849         sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
 850         sdata->control_port_no_encrypt = false;
 851
 852         /* only monitor differs */
 853         sdata->dev->type = ARPHRD_ETHER;
 854
 855         skb_queue_head_init(&sdata->skb_queue);
 856         INIT_WORK(&sdata->work, ieee80211_iface_work);
 857
 858         switch (type) {
 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_STATION:
 864                 ieee80211_sta_setup_sdata(sdata);
 865                 break;
 866         case NL80211_IFTYPE_ADHOC:
 867                 ieee80211_ibss_setup_sdata(sdata);
 868                 break;
 869         case NL80211_IFTYPE_MESH_POINT:
 870                 if (ieee80211_vif_is_mesh(&sdata->vif))
 871                         ieee80211_mesh_init_sdata(sdata);
 872                 break;
 873         case NL80211_IFTYPE_MONITOR:
 874                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
 875                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
 876                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
 877                                       MONITOR_FLAG_OTHER_BSS;
 878                 break;
 879         case NL80211_IFTYPE_WDS:
 880         case NL80211_IFTYPE_AP_VLAN:
 881                 break;
 882         case NL80211_IFTYPE_UNSPECIFIED:
 883         case NUM_NL80211_IFTYPES:
 884                 BUG();
 885                 break;
 886         }
 887
 888         ieee80211_debugfs_add_netdev(sdata);
 889 }
 890
 891 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
 892                                            enum nl80211_iftype type)
 893 {
 894         struct ieee80211_local *local = sdata->local;
 895         int ret, err;
 896
 897         ASSERT_RTNL();
 898
 899         if (!local->ops->change_interface)
 900                 return -EBUSY;
 901
 902         switch (sdata->vif.type) {
 903         case NL80211_IFTYPE_AP:
 904         case NL80211_IFTYPE_STATION:
 905         case NL80211_IFTYPE_ADHOC:
 906                 /*
 907                  * Could maybe also all others here?
 908                  * Just not sure how that interacts
 909                  * with the RX/config path e.g. for
 910                  * mesh.
 911                  */
 912                 break;
 913         default:
 914                 return -EBUSY;
 915         }
 916
 917         switch (type) {
 918         case NL80211_IFTYPE_AP:
 919         case NL80211_IFTYPE_STATION:
 920         case NL80211_IFTYPE_ADHOC:
 921                 /*
 922                  * Could probably support everything
 923                  * but WDS here (WDS do_open can fail
 924                  * under memory pressure, which this
 925                  * code isn't prepared to handle).
 926                  */
 927                 break;
 928         default:
 929                 return -EBUSY;
 930         }
 931
 932         ret = ieee80211_check_concurrent_iface(sdata, type);
 933         if (ret)
 934                 return ret;
 935
 936         ieee80211_do_stop(sdata, false);
 937
 938         ieee80211_teardown_sdata(sdata->dev);
 939
 940         ret = drv_change_interface(local, sdata, type);
 941         if (ret)
 942                 type = sdata->vif.type;
 943
 944         ieee80211_setup_sdata(sdata, type);
 945
 946         err = ieee80211_do_open(sdata->dev, false);
 947         WARN(err, "type change: do_open returned %d", err);
 948
 949         return ret;
 950 }
 951
 952 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
 953                              enum nl80211_iftype type)
 954 {
 955         int ret;
 956
 957         ASSERT_RTNL();
 958
 959         if (type == sdata->vif.type)
 960                 return 0;
 961
 962         /* Setting ad-hoc mode on non-IBSS channel is not supported. */
 963         if (sdata->local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS &&
 964             type == NL80211_IFTYPE_ADHOC)
 965                 return -EOPNOTSUPP;
 966
 967         if (ieee80211_sdata_running(sdata)) {
 968                 ret = ieee80211_runtime_change_iftype(sdata, type);
 969                 if (ret)
 970                         return ret;
 971         } else {
 972                 /* Purge and reset type-dependent state. */
 973                 ieee80211_teardown_sdata(sdata->dev);
 974                 ieee80211_setup_sdata(sdata, type);
 975         }
 976
 977         /* reset some values that shouldn't be kept across type changes */
 978         sdata->vif.bss_conf.basic_rates =
 979                 ieee80211_mandatory_rates(sdata->local,
 980                         sdata->local->hw.conf.channel->band);
 981         sdata->drop_unencrypted = 0;
 982         if (type == NL80211_IFTYPE_STATION)
 983                 sdata->u.mgd.use_4addr = false;
 984
 985         return 0;
 986 }
 987
 988 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
 989                                        struct net_device *dev,
 990                                        enum nl80211_iftype type)
 991 {
 992         struct ieee80211_sub_if_data *sdata;
 993         u64 mask, start, addr, val, inc;
 994         u8 *m;
 995         u8 tmp_addr[ETH_ALEN];
 996         int i;
 997
 998         /* default ... something at least */
 999         memcpy(dev->perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1000
1001         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1002             local->hw.wiphy->n_addresses <= 1)
1003                 return;
1004
1005
1006         mutex_lock(&local->iflist_mtx);
1007
1008         switch (type) {
1009         case NL80211_IFTYPE_MONITOR:
1010                 /* doesn't matter */
1011                 break;
1012         case NL80211_IFTYPE_WDS:
1013         case NL80211_IFTYPE_AP_VLAN:
1014                 /* match up with an AP interface */
1015                 list_for_each_entry(sdata, &local->interfaces, list) {
1016                         if (sdata->vif.type != NL80211_IFTYPE_AP)
1017                                 continue;
1018                         memcpy(dev->perm_addr, sdata->vif.addr, ETH_ALEN);
1019                         break;
1020                 }
1021                 /* keep default if no AP interface present */
1022                 break;
1023         default:
1024                 /* assign a new address if possible -- try n_addresses first */
1025                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1026                         bool used = false;
1027
1028                         list_for_each_entry(sdata, &local->interfaces, list) {
1029                                 if (memcmp(local->hw.wiphy->addresses[i].addr,
1030                                            sdata->vif.addr, ETH_ALEN) == 0) {
1031                                         used = true;
1032                                         break;
1033                                 }
1034                         }
1035
1036                         if (!used) {
1037                                 memcpy(dev->perm_addr,
1038                                        local->hw.wiphy->addresses[i].addr,
1039                                        ETH_ALEN);
1040                                 break;
1041                         }
1042                 }
1043
1044                 /* try mask if available */
1045                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1046                         break;
1047
1048                 m = local->hw.wiphy->addr_mask;
1049                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1050                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1051                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1052
1053                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1054                         /* not a contiguous mask ... not handled now! */
1055                         printk(KERN_DEBUG "not contiguous\n");
1056                         break;
1057                 }
1058
1059                 m = local->hw.wiphy->perm_addr;
1060                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1061                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1062                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1063
1064                 inc = 1ULL<<__ffs64(mask);
1065                 val = (start & mask);
1066                 addr = (start & ~mask) | (val & mask);
1067                 do {
1068                         bool used = false;
1069
1070                         tmp_addr[5] = addr >> 0*8;
1071                         tmp_addr[4] = addr >> 1*8;
1072                         tmp_addr[3] = addr >> 2*8;
1073                         tmp_addr[2] = addr >> 3*8;
1074                         tmp_addr[1] = addr >> 4*8;
1075                         tmp_addr[0] = addr >> 5*8;
1076
1077                         val += inc;
1078
1079                         list_for_each_entry(sdata, &local->interfaces, list) {
1080                                 if (memcmp(tmp_addr, sdata->vif.addr,
1081                                                         ETH_ALEN) == 0) {
1082                                         used = true;
1083                                         break;
1084                                 }
1085                         }
1086
1087                         if (!used) {
1088                                 memcpy(dev->perm_addr, tmp_addr, ETH_ALEN);
1089                                 break;
1090                         }
1091                         addr = (start & ~mask) | (val & mask);
1092                 } while (addr != start);
1093
1094                 break;
1095         }
1096
1097         mutex_unlock(&local->iflist_mtx);
1098 }
1099
1100 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1101                      struct net_device **new_dev, enum nl80211_iftype type,
1102                      struct vif_params *params)
1103 {
1104         struct net_device *ndev;
1105         struct ieee80211_sub_if_data *sdata = NULL;
1106         int ret, i;
1107
1108         ASSERT_RTNL();
1109
1110         ndev = alloc_netdev_mq(sizeof(*sdata) + local->hw.vif_data_size,
1111                                name, ieee80211_if_setup, local->hw.queues);
1112         if (!ndev)
1113                 return -ENOMEM;
1114         dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1115
1116         ndev->needed_headroom = local->tx_headroom +
1117                                 4*6 /* four MAC addresses */
1118                                 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1119                                 + 6 /* mesh */
1120                                 + 8 /* rfc1042/bridge tunnel */
1121                                 - ETH_HLEN /* ethernet hard_header_len */
1122                                 + IEEE80211_ENCRYPT_HEADROOM;
1123         ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1124
1125         ret = dev_alloc_name(ndev, ndev->name);
1126         if (ret < 0)
1127                 goto fail;
1128
1129         ieee80211_assign_perm_addr(local, ndev, type);
1130         memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1131         SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1132
1133         /* don't use IEEE80211_DEV_TO_SUB_IF because it checks too much */
1134         sdata = netdev_priv(ndev);
1135         ndev->ieee80211_ptr = &sdata->wdev;
1136         memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1137         memcpy(sdata->name, ndev->name, IFNAMSIZ);
1138
1139         /* initialise type-independent data */
1140         sdata->wdev.wiphy = local->hw.wiphy;
1141         sdata->local = local;
1142         sdata->dev = ndev;
1143 #ifdef CONFIG_INET
1144         sdata->arp_filter_state = true;
1145 #endif
1146
1147         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1148                 skb_queue_head_init(&sdata->fragments[i].skb_list);
1149
1150         INIT_LIST_HEAD(&sdata->key_list);
1151
1152         for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1153                 struct ieee80211_supported_band *sband;
1154                 sband = local->hw.wiphy->bands[i];
1155                 sdata->rc_rateidx_mask[i] =
1156                         sband ? (1 << sband->n_bitrates) - 1 : 0;
1157         }
1158
1159         /* setup type-dependent data */
1160         ieee80211_setup_sdata(sdata, type);
1161
1162         if (params) {
1163                 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1164                 if (type == NL80211_IFTYPE_STATION)
1165                         sdata->u.mgd.use_4addr = params->use_4addr;
1166         }
1167
1168         ret = register_netdevice(ndev);
1169         if (ret)
1170                 goto fail;
1171
1172         if (ieee80211_vif_is_mesh(&sdata->vif) &&
1173             params && params->mesh_id_len)
1174                 ieee80211_sdata_set_mesh_id(sdata,
1175                                             params->mesh_id_len,
1176                                             params->mesh_id);
1177
1178         mutex_lock(&local->iflist_mtx);
1179         list_add_tail_rcu(&sdata->list, &local->interfaces);
1180         mutex_unlock(&local->iflist_mtx);
1181
1182         if (new_dev)
1183                 *new_dev = ndev;
1184
1185         return 0;
1186
1187  fail:
1188         free_netdev(ndev);
1189         return ret;
1190 }
1191
1192 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1193 {
1194         ASSERT_RTNL();
1195
1196         mutex_lock(&sdata->local->iflist_mtx);
1197         list_del_rcu(&sdata->list);
1198         mutex_unlock(&sdata->local->iflist_mtx);
1199
1200         synchronize_rcu();
1201         unregister_netdevice(sdata->dev);
1202 }
1203
1204 /*
1205  * Remove all interfaces, may only be called at hardware unregistration
1206  * time because it doesn't do RCU-safe list removals.
1207  */
1208 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1209 {
1210         struct ieee80211_sub_if_data *sdata, *tmp;
1211         LIST_HEAD(unreg_list);
1212
1213         ASSERT_RTNL();
1214
1215         mutex_lock(&local->iflist_mtx);
1216         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1217                 list_del(&sdata->list);
1218
1219                 unregister_netdevice_queue(sdata->dev, &unreg_list);
1220         }
1221         mutex_unlock(&local->iflist_mtx);
1222         unregister_netdevice_many(&unreg_list);
1223 }
1224
1225 static u32 ieee80211_idle_off(struct ieee80211_local *local,
1226                               const char *reason)
1227 {
1228         if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
1229                 return 0;
1230
1231 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1232         wiphy_debug(local->hw.wiphy, "device no longer idle - %s\n", reason);
1233 #endif
1234
1235         local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
1236         return IEEE80211_CONF_CHANGE_IDLE;
1237 }
1238
1239 static u32 ieee80211_idle_on(struct ieee80211_local *local)
1240 {
1241         if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
1242                 return 0;
1243
1244 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1245         wiphy_debug(local->hw.wiphy, "device now idle\n");
1246 #endif
1247
1248         drv_flush(local, false);
1249
1250         local->hw.conf.flags |= IEEE80211_CONF_IDLE;
1251         return IEEE80211_CONF_CHANGE_IDLE;
1252 }
1253
1254 u32 __ieee80211_recalc_idle(struct ieee80211_local *local)
1255 {
1256         struct ieee80211_sub_if_data *sdata;
1257         int count = 0;
1258         bool working = false, scanning = false;
1259         struct ieee80211_work *wk;
1260
1261 #ifdef CONFIG_PROVE_LOCKING
1262         WARN_ON(debug_locks && !lockdep_rtnl_is_held() &&
1263                 !lockdep_is_held(&local->iflist_mtx));
1264 #endif
1265         lockdep_assert_held(&local->mtx);
1266
1267         list_for_each_entry(sdata, &local->interfaces, list) {
1268                 if (!ieee80211_sdata_running(sdata)) {
1269                         sdata->vif.bss_conf.idle = true;
1270                         continue;
1271                 }
1272
1273                 sdata->old_idle = sdata->vif.bss_conf.idle;
1274
1275                 /* do not count disabled managed interfaces */
1276                 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1277                     !sdata->u.mgd.associated) {
1278                         sdata->vif.bss_conf.idle = true;
1279                         continue;
1280                 }
1281                 /* do not count unused IBSS interfaces */
1282                 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
1283                     !sdata->u.ibss.ssid_len) {
1284                         sdata->vif.bss_conf.idle = true;
1285                         continue;
1286                 }
1287                 /* count everything else */
1288                 count++;
1289         }
1290
1291         list_for_each_entry(wk, &local->work_list, list) {
1292                 working = true;
1293                 wk->sdata->vif.bss_conf.idle = false;
1294         }
1295
1296         if (local->scan_sdata) {
1297                 scanning = true;
1298                 local->scan_sdata->vif.bss_conf.idle = false;
1299         }
1300
1301         list_for_each_entry(sdata, &local->interfaces, list) {
1302                 if (sdata->old_idle == sdata->vif.bss_conf.idle)
1303                         continue;
1304                 if (!ieee80211_sdata_running(sdata))
1305                         continue;
1306                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_IDLE);
1307         }
1308
1309         if (working)
1310                 return ieee80211_idle_off(local, "working");
1311         if (scanning)
1312                 return ieee80211_idle_off(local, "scanning");
1313         if (!count)
1314                 return ieee80211_idle_on(local);
1315         else
1316                 return ieee80211_idle_off(local, "in use");
1317
1318         return 0;
1319 }
1320
1321 void ieee80211_recalc_idle(struct ieee80211_local *local)
1322 {
1323         u32 chg;
1324
1325         mutex_lock(&local->iflist_mtx);
1326         chg = __ieee80211_recalc_idle(local);
1327         mutex_unlock(&local->iflist_mtx);
1328         if (chg)
1329                 ieee80211_hw_config(local, chg);
1330 }
1331
1332 static int netdev_notify(struct notifier_block *nb,
1333                          unsigned long state,
1334                          void *ndev)
1335 {
1336         struct net_device *dev = ndev;
1337         struct ieee80211_sub_if_data *sdata;
1338
1339         if (state != NETDEV_CHANGENAME)
1340                 return 0;
1341
1342         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1343                 return 0;
1344
1345         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1346                 return 0;
1347
1348         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1349
1350         memcpy(sdata->name, dev->name, IFNAMSIZ);
1351
1352         ieee80211_debugfs_rename_netdev(sdata);
1353         return 0;
1354 }
1355
1356 static struct notifier_block mac80211_netdev_notifier = {
1357         .notifier_call = netdev_notify,
1358 };
1359
1360 int ieee80211_iface_init(void)
1361 {
1362         return register_netdevice_notifier(&mac80211_netdev_notifier);
1363 }
1364
1365 void ieee80211_iface_exit(void)
1366 {
1367         unregister_netdevice_notifier(&mac80211_netdev_notifier);
1368 }