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         case NL80211_IFTYPE_P2P_CLIENT:
 192         case NL80211_IFTYPE_P2P_GO:
 193                 /* cannot happen */
 194                 WARN_ON(1);
 195                 break;
 196         }
 197
 198         if (local->open_count == 0) {
 199                 res = drv_start(local);
 200                 if (res)
 201                         goto err_del_bss;
 202                 if (local->ops->napi_poll)
 203                         napi_enable(&local->napi);
 204                 /* we're brought up, everything changes */
 205                 hw_reconf_flags = ~0;
 206                 ieee80211_led_radio(local, true);
 207         }
 208
 209         /*
 210          * Copy the hopefully now-present MAC address to
 211          * this interface, if it has the special null one.
 212          */
 213         if (is_zero_ether_addr(dev->dev_addr)) {
 214                 memcpy(dev->dev_addr,
 215                        local->hw.wiphy->perm_addr,
 216                        ETH_ALEN);
 217                 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
 218
 219                 if (!is_valid_ether_addr(dev->dev_addr)) {
 220                         if (!local->open_count)
 221                                 drv_stop(local);
 222                         return -EADDRNOTAVAIL;
 223                 }
 224         }
 225
 226         switch (sdata->vif.type) {
 227         case NL80211_IFTYPE_AP_VLAN:
 228                 /* no need to tell driver */
 229                 break;
 230         case NL80211_IFTYPE_MONITOR:
 231                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 232                         local->cooked_mntrs++;
 233                         break;
 234                 }
 235
 236                 /* must be before the call to ieee80211_configure_filter */
 237                 local->monitors++;
 238                 if (local->monitors == 1) {
 239                         local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
 240                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 241                 }
 242
 243                 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
 244                         local->fif_fcsfail++;
 245                 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
 246                         local->fif_plcpfail++;
 247                 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL) {
 248                         local->fif_control++;
 249                         local->fif_pspoll++;
 250                 }
 251                 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
 252                         local->fif_other_bss++;
 253
 254                 ieee80211_configure_filter(local);
 255
 256                 netif_carrier_on(dev);
 257                 break;
 258         default:
 259                 if (coming_up) {
 260                         res = drv_add_interface(local, &sdata->vif);
 261                         if (res)
 262                                 goto err_stop;
 263                 }
 264
 265                 if (ieee80211_vif_is_mesh(&sdata->vif)) {
 266                         local->fif_other_bss++;
 267                         ieee80211_configure_filter(local);
 268
 269                         ieee80211_start_mesh(sdata);
 270                 } else if (sdata->vif.type == NL80211_IFTYPE_AP) {
 271                         local->fif_pspoll++;
 272
 273                         ieee80211_configure_filter(local);
 274                 }
 275
 276                 changed |= ieee80211_reset_erp_info(sdata);
 277                 ieee80211_bss_info_change_notify(sdata, changed);
 278
 279                 if (sdata->vif.type == NL80211_IFTYPE_STATION)
 280                         netif_carrier_off(dev);
 281                 else
 282                         netif_carrier_on(dev);
 283         }
 284
 285         set_bit(SDATA_STATE_RUNNING, &sdata->state);
 286
 287         if (sdata->vif.type == NL80211_IFTYPE_WDS) {
 288                 /* Create STA entry for the WDS peer */
 289                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
 290                                      GFP_KERNEL);
 291                 if (!sta) {
 292                         res = -ENOMEM;
 293                         goto err_del_interface;
 294                 }
 295
 296                 /* no locking required since STA is not live yet */
 297                 sta->flags |= WLAN_STA_AUTHORIZED;
 298
 299                 res = sta_info_insert(sta);
 300                 if (res) {
 301                         /* STA has been freed */
 302                         goto err_del_interface;
 303                 }
 304         }
 305
 306         /*
 307          * set_multicast_list will be invoked by the networking core
 308          * which will check whether any increments here were done in
 309          * error and sync them down to the hardware as filter flags.
 310          */
 311         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 312                 atomic_inc(&local->iff_allmultis);
 313
 314         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 315                 atomic_inc(&local->iff_promiscs);
 316
 317         mutex_lock(&local->mtx);
 318         hw_reconf_flags |= __ieee80211_recalc_idle(local);
 319         mutex_unlock(&local->mtx);
 320
 321         if (coming_up)
 322                 local->open_count++;
 323
 324         if (hw_reconf_flags) {
 325                 ieee80211_hw_config(local, hw_reconf_flags);
 326                 /*
 327                  * set default queue parameters so drivers don't
 328                  * need to initialise the hardware if the hardware
 329                  * doesn't start up with sane defaults
 330                  */
 331                 ieee80211_set_wmm_default(sdata);
 332         }
 333
 334         ieee80211_recalc_ps(local, -1);
 335
 336         netif_tx_start_all_queues(dev);
 337
 338         return 0;
 339  err_del_interface:
 340         drv_remove_interface(local, &sdata->vif);
 341  err_stop:
 342         if (!local->open_count)
 343                 drv_stop(local);
 344  err_del_bss:
 345         sdata->bss = NULL;
 346         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
 347                 list_del(&sdata->u.vlan.list);
 348         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 349         return res;
 350 }
 351
 352 static int ieee80211_open(struct net_device *dev)
 353 {
 354         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 355         int err;
 356
 357         /* fail early if user set an invalid address */
 358         if (!is_zero_ether_addr(dev->dev_addr) &&
 359             !is_valid_ether_addr(dev->dev_addr))
 360                 return -EADDRNOTAVAIL;
 361
 362         err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
 363         if (err)
 364                 return err;
 365
 366         return ieee80211_do_open(dev, true);
 367 }
 368
 369 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
 370                               bool going_down)
 371 {
 372         struct ieee80211_local *local = sdata->local;
 373         unsigned long flags;
 374         struct sk_buff *skb, *tmp;
 375         u32 hw_reconf_flags = 0;
 376         int i;
 377
 378         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 379
 380         /*
 381          * Stop TX on this interface first.
 382          */
 383         netif_tx_stop_all_queues(sdata->dev);
 384
 385         /*
 386          * Purge work for this interface.
 387          */
 388         ieee80211_work_purge(sdata);
 389
 390         /*
 391          * Remove all stations associated with this interface.
 392          *
 393          * This must be done before calling ops->remove_interface()
 394          * because otherwise we can later invoke ops->sta_notify()
 395          * whenever the STAs are removed, and that invalidates driver
 396          * assumptions about always getting a vif pointer that is valid
 397          * (because if we remove a STA after ops->remove_interface()
 398          * the driver will have removed the vif info already!)
 399          *
 400          * This is relevant only in AP, WDS and mesh modes, since in
 401          * all other modes we've already removed all stations when
 402          * disconnecting etc.
 403          */
 404         sta_info_flush(local, sdata);
 405
 406         /*
 407          * Don't count this interface for promisc/allmulti while it
 408          * is down. dev_mc_unsync() will invoke set_multicast_list
 409          * on the master interface which will sync these down to the
 410          * hardware as filter flags.
 411          */
 412         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 413                 atomic_dec(&local->iff_allmultis);
 414
 415         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 416                 atomic_dec(&local->iff_promiscs);
 417
 418         if (sdata->vif.type == NL80211_IFTYPE_AP)
 419                 local->fif_pspoll--;
 420
 421         netif_addr_lock_bh(sdata->dev);
 422         spin_lock_bh(&local->filter_lock);
 423         __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
 424                          sdata->dev->addr_len);
 425         spin_unlock_bh(&local->filter_lock);
 426         netif_addr_unlock_bh(sdata->dev);
 427
 428         ieee80211_configure_filter(local);
 429
 430         del_timer_sync(&local->dynamic_ps_timer);
 431         cancel_work_sync(&local->dynamic_ps_enable_work);
 432
 433         /* APs need special treatment */
 434         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 435                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
 436                 struct beacon_data *old_beacon = sdata->u.ap.beacon;
 437
 438                 /* sdata_running will return false, so this will disable */
 439                 ieee80211_bss_info_change_notify(sdata,
 440                                                  BSS_CHANGED_BEACON_ENABLED);
 441
 442                 /* remove beacon */
 443                 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
 444                 synchronize_rcu();
 445                 kfree(old_beacon);
 446
 447                 /* free all potentially still buffered bcast frames */
 448                 while ((skb = skb_dequeue(&sdata->u.ap.ps_bc_buf))) {
 449                         local->total_ps_buffered--;
 450                         dev_kfree_skb(skb);
 451                 }
 452
 453                 /* down all dependent devices, that is VLANs */
 454                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
 455                                          u.vlan.list)
 456                         dev_close(vlan->dev);
 457                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
 458         }
 459
 460         if (going_down)
 461                 local->open_count--;
 462
 463         switch (sdata->vif.type) {
 464         case NL80211_IFTYPE_AP_VLAN:
 465                 list_del(&sdata->u.vlan.list);
 466                 /* no need to tell driver */
 467                 break;
 468         case NL80211_IFTYPE_MONITOR:
 469                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 470                         local->cooked_mntrs--;
 471                         break;
 472                 }
 473
 474                 local->monitors--;
 475                 if (local->monitors == 0) {
 476                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
 477                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 478                 }
 479
 480                 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
 481                         local->fif_fcsfail--;
 482                 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
 483                         local->fif_plcpfail--;
 484                 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL) {
 485                         local->fif_pspoll--;
 486                         local->fif_control--;
 487                 }
 488                 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
 489                         local->fif_other_bss--;
 490
 491                 ieee80211_configure_filter(local);
 492                 break;
 493         case NL80211_IFTYPE_MESH_POINT:
 494                 if (ieee80211_vif_is_mesh(&sdata->vif)) {
 495                         /* other_bss and allmulti are always set on mesh
 496                          * ifaces */
 497                         local->fif_other_bss--;
 498                         atomic_dec(&local->iff_allmultis);
 499
 500                         ieee80211_configure_filter(local);
 501
 502                         ieee80211_stop_mesh(sdata);
 503                 }
 504                 /* fall through */
 505         default:
 506                 flush_work(&sdata->work);
 507                 /*
 508                  * When we get here, the interface is marked down.
 509                  * Call synchronize_rcu() to wait for the RX path
 510                  * should it be using the interface and enqueuing
 511                  * frames at this very time on another CPU.
 512                  */
 513                 synchronize_rcu();
 514                 skb_queue_purge(&sdata->skb_queue);
 515
 516                 if (local->scan_sdata == sdata)
 517                         ieee80211_scan_cancel(local);
 518
 519                 /*
 520                  * Disable beaconing here for mesh only, AP and IBSS
 521                  * are already taken care of.
 522                  */
 523                 if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
 524                         ieee80211_bss_info_change_notify(sdata,
 525                                 BSS_CHANGED_BEACON_ENABLED);
 526
 527                 /*
 528                  * Free all remaining keys, there shouldn't be any,
 529                  * except maybe group keys in AP more or WDS?
 530                  */
 531                 ieee80211_free_keys(sdata);
 532
 533                 if (going_down)
 534                         drv_remove_interface(local, &sdata->vif);
 535         }
 536
 537         sdata->bss = NULL;
 538
 539         mutex_lock(&local->mtx);
 540         hw_reconf_flags |= __ieee80211_recalc_idle(local);
 541         mutex_unlock(&local->mtx);
 542
 543         ieee80211_recalc_ps(local, -1);
 544
 545         if (local->open_count == 0) {
 546                 if (local->ops->napi_poll)
 547                         napi_disable(&local->napi);
 548                 ieee80211_clear_tx_pending(local);
 549                 ieee80211_stop_device(local);
 550
 551                 /* no reconfiguring after stop! */
 552                 hw_reconf_flags = 0;
 553         }
 554
 555         /* do after stop to avoid reconfiguring when we stop anyway */
 556         if (hw_reconf_flags)
 557                 ieee80211_hw_config(local, hw_reconf_flags);
 558
 559         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 560         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 561                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
 562                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 563                         if (info->control.vif == &sdata->vif) {
 564                                 __skb_unlink(skb, &local->pending[i]);
 565                                 dev_kfree_skb_irq(skb);
 566                         }
 567                 }
 568         }
 569         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 570 }
 571
 572 static int ieee80211_stop(struct net_device *dev)
 573 {
 574         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 575
 576         ieee80211_do_stop(sdata, true);
 577
 578         return 0;
 579 }
 580
 581 static void ieee80211_set_multicast_list(struct net_device *dev)
 582 {
 583         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 584         struct ieee80211_local *local = sdata->local;
 585         int allmulti, promisc, sdata_allmulti, sdata_promisc;
 586
 587         allmulti = !!(dev->flags & IFF_ALLMULTI);
 588         promisc = !!(dev->flags & IFF_PROMISC);
 589         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
 590         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
 591
 592         if (allmulti != sdata_allmulti) {
 593                 if (dev->flags & IFF_ALLMULTI)
 594                         atomic_inc(&local->iff_allmultis);
 595                 else
 596                         atomic_dec(&local->iff_allmultis);
 597                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
 598         }
 599
 600         if (promisc != sdata_promisc) {
 601                 if (dev->flags & IFF_PROMISC)
 602                         atomic_inc(&local->iff_promiscs);
 603                 else
 604                         atomic_dec(&local->iff_promiscs);
 605                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
 606         }
 607         spin_lock_bh(&local->filter_lock);
 608         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
 609         spin_unlock_bh(&local->filter_lock);
 610         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
 611 }
 612
 613 /*
 614  * Called when the netdev is removed or, by the code below, before
 615  * the interface type changes.
 616  */
 617 static void ieee80211_teardown_sdata(struct net_device *dev)
 618 {
 619         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 620         struct ieee80211_local *local = sdata->local;
 621         int flushed;
 622         int i;
 623
 624         /* free extra data */
 625         ieee80211_free_keys(sdata);
 626
 627         ieee80211_debugfs_remove_netdev(sdata);
 628
 629         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
 630                 __skb_queue_purge(&sdata->fragments[i].skb_list);
 631         sdata->fragment_next = 0;
 632
 633         if (ieee80211_vif_is_mesh(&sdata->vif))
 634                 mesh_rmc_free(sdata);
 635
 636         flushed = sta_info_flush(local, sdata);
 637         WARN_ON(flushed);
 638 }
 639
 640 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
 641                                          struct sk_buff *skb)
 642 {
 643         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
 644 }
 645
 646 static const struct net_device_ops ieee80211_dataif_ops = {
 647         .ndo_open               = ieee80211_open,
 648         .ndo_stop               = ieee80211_stop,
 649         .ndo_uninit             = ieee80211_teardown_sdata,
 650         .ndo_start_xmit         = ieee80211_subif_start_xmit,
 651         .ndo_set_multicast_list = ieee80211_set_multicast_list,
 652         .ndo_change_mtu         = ieee80211_change_mtu,
 653         .ndo_set_mac_address    = ieee80211_change_mac,
 654         .ndo_select_queue       = ieee80211_netdev_select_queue,
 655 };
 656
 657 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
 658                                           struct sk_buff *skb)
 659 {
 660         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 661         struct ieee80211_local *local = sdata->local;
 662         struct ieee80211_hdr *hdr;
 663         struct ieee80211_radiotap_header *rtap = (void *)skb->data;
 664         u8 *p;
 665
 666         if (local->hw.queues < 4)
 667                 return 0;
 668
 669         if (skb->len < 4 ||
 670             skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
 671                 return 0; /* doesn't matter, frame will be dropped */
 672
 673         hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
 674
 675         if (!ieee80211_is_data(hdr->frame_control)) {
 676                 skb->priority = 7;
 677                 return ieee802_1d_to_ac[skb->priority];
 678         }
 679         if (!ieee80211_is_data_qos(hdr->frame_control)) {
 680                 skb->priority = 0;
 681                 return ieee802_1d_to_ac[skb->priority];
 682         }
 683
 684         p = ieee80211_get_qos_ctl(hdr);
 685         skb->priority = *p & IEEE80211_QOS_CTL_TAG1D_MASK;
 686
 687         return ieee80211_downgrade_queue(local, skb);
 688 }
 689
 690 static const struct net_device_ops ieee80211_monitorif_ops = {
 691         .ndo_open               = ieee80211_open,
 692         .ndo_stop               = ieee80211_stop,
 693         .ndo_uninit             = ieee80211_teardown_sdata,
 694         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
 695         .ndo_set_multicast_list = ieee80211_set_multicast_list,
 696         .ndo_change_mtu         = ieee80211_change_mtu,
 697         .ndo_set_mac_address    = eth_mac_addr,
 698         .ndo_select_queue       = ieee80211_monitor_select_queue,
 699 };
 700
 701 static void ieee80211_if_setup(struct net_device *dev)
 702 {
 703         ether_setup(dev);
 704         dev->netdev_ops = &ieee80211_dataif_ops;
 705         dev->destructor = free_netdev;
 706 }
 707
 708 static void ieee80211_iface_work(struct work_struct *work)
 709 {
 710         struct ieee80211_sub_if_data *sdata =
 711                 container_of(work, struct ieee80211_sub_if_data, work);
 712         struct ieee80211_local *local = sdata->local;
 713         struct sk_buff *skb;
 714         struct sta_info *sta;
 715         struct ieee80211_ra_tid *ra_tid;
 716
 717         if (!ieee80211_sdata_running(sdata))
 718                 return;
 719
 720         if (local->scanning)
 721                 return;
 722
 723         /*
 724          * ieee80211_queue_work() should have picked up most cases,
 725          * here we'll pick the rest.
 726          */
 727         if (WARN(local->suspended,
 728                  "interface work scheduled while going to suspend\n"))
 729                 return;
 730
 731         /* first process frames */
 732         while ((skb = skb_dequeue(&sdata->skb_queue))) {
 733                 struct ieee80211_mgmt *mgmt = (void *)skb->data;
 734
 735                 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
 736                         ra_tid = (void *)&skb->cb;
 737                         ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
 738                                                  ra_tid->tid);
 739                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
 740                         ra_tid = (void *)&skb->cb;
 741                         ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
 742                                                 ra_tid->tid);
 743                 } else if (ieee80211_is_action(mgmt->frame_control) &&
 744                            mgmt->u.action.category == WLAN_CATEGORY_BACK) {
 745                         int len = skb->len;
 746
 747                         mutex_lock(&local->sta_mtx);
 748                         sta = sta_info_get_bss(sdata, mgmt->sa);
 749                         if (sta) {
 750                                 switch (mgmt->u.action.u.addba_req.action_code) {
 751                                 case WLAN_ACTION_ADDBA_REQ:
 752                                         ieee80211_process_addba_request(
 753                                                         local, sta, mgmt, len);
 754                                         break;
 755                                 case WLAN_ACTION_ADDBA_RESP:
 756                                         ieee80211_process_addba_resp(local, sta,
 757                                                                      mgmt, len);
 758                                         break;
 759                                 case WLAN_ACTION_DELBA:
 760                                         ieee80211_process_delba(sdata, sta,
 761                                                                 mgmt, len);
 762                                         break;
 763                                 default:
 764                                         WARN_ON(1);
 765                                         break;
 766                                 }
 767                         }
 768                         mutex_unlock(&local->sta_mtx);
 769                 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
 770                         struct ieee80211_hdr *hdr = (void *)mgmt;
 771                         /*
 772                          * So the frame isn't mgmt, but frame_control
 773                          * is at the right place anyway, of course, so
 774                          * the if statement is correct.
 775                          *
 776                          * Warn if we have other data frame types here,
 777                          * they must not get here.
 778                          */
 779                         WARN_ON(hdr->frame_control &
 780                                         cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
 781                         WARN_ON(!(hdr->seq_ctrl &
 782                                         cpu_to_le16(IEEE80211_SCTL_FRAG)));
 783                         /*
 784                          * This was a fragment of a frame, received while
 785                          * a block-ack session was active. That cannot be
 786                          * right, so terminate the session.
 787                          */
 788                         mutex_lock(&local->sta_mtx);
 789                         sta = sta_info_get_bss(sdata, mgmt->sa);
 790                         if (sta) {
 791                                 u16 tid = *ieee80211_get_qos_ctl(hdr) &
 792                                                 IEEE80211_QOS_CTL_TID_MASK;
 793
 794                                 __ieee80211_stop_rx_ba_session(
 795                                         sta, tid, WLAN_BACK_RECIPIENT,
 796                                         WLAN_REASON_QSTA_REQUIRE_SETUP);
 797                         }
 798                         mutex_unlock(&local->sta_mtx);
 799                 } else switch (sdata->vif.type) {
 800                 case NL80211_IFTYPE_STATION:
 801                         ieee80211_sta_rx_queued_mgmt(sdata, skb);
 802                         break;
 803                 case NL80211_IFTYPE_ADHOC:
 804                         ieee80211_ibss_rx_queued_mgmt(sdata, skb);
 805                         break;
 806                 case NL80211_IFTYPE_MESH_POINT:
 807                         if (!ieee80211_vif_is_mesh(&sdata->vif))
 808                                 break;
 809                         ieee80211_mesh_rx_queued_mgmt(sdata, skb);
 810                         break;
 811                 default:
 812                         WARN(1, "frame for unexpected interface type");
 813                         break;
 814                 }
 815
 816                 kfree_skb(skb);
 817         }
 818
 819         /* then other type-dependent work */
 820         switch (sdata->vif.type) {
 821         case NL80211_IFTYPE_STATION:
 822                 ieee80211_sta_work(sdata);
 823                 break;
 824         case NL80211_IFTYPE_ADHOC:
 825                 ieee80211_ibss_work(sdata);
 826                 break;
 827         case NL80211_IFTYPE_MESH_POINT:
 828                 if (!ieee80211_vif_is_mesh(&sdata->vif))
 829                         break;
 830                 ieee80211_mesh_work(sdata);
 831                 break;
 832         default:
 833                 break;
 834         }
 835 }
 836
 837
 838 /*
 839  * Helper function to initialise an interface to a specific type.
 840  */
 841 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
 842                                   enum nl80211_iftype type)
 843 {
 844         /* clear type-dependent union */
 845         memset(&sdata->u, 0, sizeof(sdata->u));
 846
 847         /* and set some type-dependent values */
 848         sdata->vif.type = type;
 849         sdata->vif.p2p = false;
 850         sdata->dev->netdev_ops = &ieee80211_dataif_ops;
 851         sdata->wdev.iftype = type;
 852
 853         sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
 854         sdata->control_port_no_encrypt = false;
 855
 856         /* only monitor differs */
 857         sdata->dev->type = ARPHRD_ETHER;
 858
 859         skb_queue_head_init(&sdata->skb_queue);
 860         INIT_WORK(&sdata->work, ieee80211_iface_work);
 861
 862         switch (type) {
 863         case NL80211_IFTYPE_P2P_GO:
 864                 type = NL80211_IFTYPE_AP;
 865                 sdata->vif.type = type;
 866                 sdata->vif.p2p = true;
 867                 /* fall through */
 868         case NL80211_IFTYPE_AP:
 869                 skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
 870                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
 871                 break;
 872         case NL80211_IFTYPE_P2P_CLIENT:
 873                 type = NL80211_IFTYPE_STATION;
 874                 sdata->vif.type = type;
 875                 sdata->vif.p2p = true;
 876                 /* fall through */
 877         case NL80211_IFTYPE_STATION:
 878                 ieee80211_sta_setup_sdata(sdata);
 879                 break;
 880         case NL80211_IFTYPE_ADHOC:
 881                 ieee80211_ibss_setup_sdata(sdata);
 882                 break;
 883         case NL80211_IFTYPE_MESH_POINT:
 884                 if (ieee80211_vif_is_mesh(&sdata->vif))
 885                         ieee80211_mesh_init_sdata(sdata);
 886                 break;
 887         case NL80211_IFTYPE_MONITOR:
 888                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
 889                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
 890                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
 891                                       MONITOR_FLAG_OTHER_BSS;
 892                 break;
 893         case NL80211_IFTYPE_WDS:
 894         case NL80211_IFTYPE_AP_VLAN:
 895                 break;
 896         case NL80211_IFTYPE_UNSPECIFIED:
 897         case NUM_NL80211_IFTYPES:
 898                 BUG();
 899                 break;
 900         }
 901
 902         ieee80211_debugfs_add_netdev(sdata);
 903 }
 904
 905 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
 906                                            enum nl80211_iftype type)
 907 {
 908         struct ieee80211_local *local = sdata->local;
 909         int ret, err;
 910         enum nl80211_iftype internal_type = type;
 911         bool p2p = false;
 912
 913         ASSERT_RTNL();
 914
 915         if (!local->ops->change_interface)
 916                 return -EBUSY;
 917
 918         switch (sdata->vif.type) {
 919         case NL80211_IFTYPE_AP:
 920         case NL80211_IFTYPE_STATION:
 921         case NL80211_IFTYPE_ADHOC:
 922                 /*
 923                  * Could maybe also all others here?
 924                  * Just not sure how that interacts
 925                  * with the RX/config path e.g. for
 926                  * mesh.
 927                  */
 928                 break;
 929         default:
 930                 return -EBUSY;
 931         }
 932
 933         switch (type) {
 934         case NL80211_IFTYPE_AP:
 935         case NL80211_IFTYPE_STATION:
 936         case NL80211_IFTYPE_ADHOC:
 937                 /*
 938                  * Could probably support everything
 939                  * but WDS here (WDS do_open can fail
 940                  * under memory pressure, which this
 941                  * code isn't prepared to handle).
 942                  */
 943                 break;
 944         case NL80211_IFTYPE_P2P_CLIENT:
 945                 p2p = true;
 946                 internal_type = NL80211_IFTYPE_STATION;
 947                 break;
 948         case NL80211_IFTYPE_P2P_GO:
 949                 p2p = true;
 950                 internal_type = NL80211_IFTYPE_AP;
 951                 break;
 952         default:
 953                 return -EBUSY;
 954         }
 955
 956         ret = ieee80211_check_concurrent_iface(sdata, internal_type);
 957         if (ret)
 958                 return ret;
 959
 960         ieee80211_do_stop(sdata, false);
 961
 962         ieee80211_teardown_sdata(sdata->dev);
 963
 964         ret = drv_change_interface(local, sdata, internal_type, p2p);
 965         if (ret)
 966                 type = sdata->vif.type;
 967
 968         ieee80211_setup_sdata(sdata, type);
 969
 970         err = ieee80211_do_open(sdata->dev, false);
 971         WARN(err, "type change: do_open returned %d", err);
 972
 973         return ret;
 974 }
 975
 976 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
 977                              enum nl80211_iftype type)
 978 {
 979         int ret;
 980
 981         ASSERT_RTNL();
 982
 983         if (type == ieee80211_vif_type_p2p(&sdata->vif))
 984                 return 0;
 985
 986         /* Setting ad-hoc mode on non-IBSS channel is not supported. */
 987         if (sdata->local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS &&
 988             type == NL80211_IFTYPE_ADHOC)
 989                 return -EOPNOTSUPP;
 990
 991         if (ieee80211_sdata_running(sdata)) {
 992                 ret = ieee80211_runtime_change_iftype(sdata, type);
 993                 if (ret)
 994                         return ret;
 995         } else {
 996                 /* Purge and reset type-dependent state. */
 997                 ieee80211_teardown_sdata(sdata->dev);
 998                 ieee80211_setup_sdata(sdata, type);
 999         }
1000
1001         /* reset some values that shouldn't be kept across type changes */
1002         sdata->vif.bss_conf.basic_rates =
1003                 ieee80211_mandatory_rates(sdata->local,
1004                         sdata->local->hw.conf.channel->band);
1005         sdata->drop_unencrypted = 0;
1006         if (type == NL80211_IFTYPE_STATION)
1007                 sdata->u.mgd.use_4addr = false;
1008
1009         return 0;
1010 }
1011
1012 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1013                                        struct net_device *dev,
1014                                        enum nl80211_iftype type)
1015 {
1016         struct ieee80211_sub_if_data *sdata;
1017         u64 mask, start, addr, val, inc;
1018         u8 *m;
1019         u8 tmp_addr[ETH_ALEN];
1020         int i;
1021
1022         /* default ... something at least */
1023         memcpy(dev->perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1024
1025         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1026             local->hw.wiphy->n_addresses <= 1)
1027                 return;
1028
1029
1030         mutex_lock(&local->iflist_mtx);
1031
1032         switch (type) {
1033         case NL80211_IFTYPE_MONITOR:
1034                 /* doesn't matter */
1035                 break;
1036         case NL80211_IFTYPE_WDS:
1037         case NL80211_IFTYPE_AP_VLAN:
1038                 /* match up with an AP interface */
1039                 list_for_each_entry(sdata, &local->interfaces, list) {
1040                         if (sdata->vif.type != NL80211_IFTYPE_AP)
1041                                 continue;
1042                         memcpy(dev->perm_addr, sdata->vif.addr, ETH_ALEN);
1043                         break;
1044                 }
1045                 /* keep default if no AP interface present */
1046                 break;
1047         default:
1048                 /* assign a new address if possible -- try n_addresses first */
1049                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1050                         bool used = false;
1051
1052                         list_for_each_entry(sdata, &local->interfaces, list) {
1053                                 if (memcmp(local->hw.wiphy->addresses[i].addr,
1054                                            sdata->vif.addr, ETH_ALEN) == 0) {
1055                                         used = true;
1056                                         break;
1057                                 }
1058                         }
1059
1060                         if (!used) {
1061                                 memcpy(dev->perm_addr,
1062                                        local->hw.wiphy->addresses[i].addr,
1063                                        ETH_ALEN);
1064                                 break;
1065                         }
1066                 }
1067
1068                 /* try mask if available */
1069                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1070                         break;
1071
1072                 m = local->hw.wiphy->addr_mask;
1073                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1074                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1075                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1076
1077                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1078                         /* not a contiguous mask ... not handled now! */
1079                         printk(KERN_DEBUG "not contiguous\n");
1080                         break;
1081                 }
1082
1083                 m = local->hw.wiphy->perm_addr;
1084                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1085                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1086                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1087
1088                 inc = 1ULL<<__ffs64(mask);
1089                 val = (start & mask);
1090                 addr = (start & ~mask) | (val & mask);
1091                 do {
1092                         bool used = false;
1093
1094                         tmp_addr[5] = addr >> 0*8;
1095                         tmp_addr[4] = addr >> 1*8;
1096                         tmp_addr[3] = addr >> 2*8;
1097                         tmp_addr[2] = addr >> 3*8;
1098                         tmp_addr[1] = addr >> 4*8;
1099                         tmp_addr[0] = addr >> 5*8;
1100
1101                         val += inc;
1102
1103                         list_for_each_entry(sdata, &local->interfaces, list) {
1104                                 if (memcmp(tmp_addr, sdata->vif.addr,
1105                                                         ETH_ALEN) == 0) {
1106                                         used = true;
1107                                         break;
1108                                 }
1109                         }
1110
1111                         if (!used) {
1112                                 memcpy(dev->perm_addr, tmp_addr, ETH_ALEN);
1113                                 break;
1114                         }
1115                         addr = (start & ~mask) | (val & mask);
1116                 } while (addr != start);
1117
1118                 break;
1119         }
1120
1121         mutex_unlock(&local->iflist_mtx);
1122 }
1123
1124 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1125                      struct net_device **new_dev, enum nl80211_iftype type,
1126                      struct vif_params *params)
1127 {
1128         struct net_device *ndev;
1129         struct ieee80211_sub_if_data *sdata = NULL;
1130         int ret, i;
1131
1132         ASSERT_RTNL();
1133
1134         ndev = alloc_netdev_mq(sizeof(*sdata) + local->hw.vif_data_size,
1135                                name, ieee80211_if_setup, local->hw.queues);
1136         if (!ndev)
1137                 return -ENOMEM;
1138         dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1139
1140         ndev->needed_headroom = local->tx_headroom +
1141                                 4*6 /* four MAC addresses */
1142                                 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1143                                 + 6 /* mesh */
1144                                 + 8 /* rfc1042/bridge tunnel */
1145                                 - ETH_HLEN /* ethernet hard_header_len */
1146                                 + IEEE80211_ENCRYPT_HEADROOM;
1147         ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1148
1149         ret = dev_alloc_name(ndev, ndev->name);
1150         if (ret < 0)
1151                 goto fail;
1152
1153         ieee80211_assign_perm_addr(local, ndev, type);
1154         memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1155         SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1156
1157         /* don't use IEEE80211_DEV_TO_SUB_IF because it checks too much */
1158         sdata = netdev_priv(ndev);
1159         ndev->ieee80211_ptr = &sdata->wdev;
1160         memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1161         memcpy(sdata->name, ndev->name, IFNAMSIZ);
1162
1163         /* initialise type-independent data */
1164         sdata->wdev.wiphy = local->hw.wiphy;
1165         sdata->local = local;
1166         sdata->dev = ndev;
1167 #ifdef CONFIG_INET
1168         sdata->arp_filter_state = true;
1169 #endif
1170
1171         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1172                 skb_queue_head_init(&sdata->fragments[i].skb_list);
1173
1174         INIT_LIST_HEAD(&sdata->key_list);
1175
1176         for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1177                 struct ieee80211_supported_band *sband;
1178                 sband = local->hw.wiphy->bands[i];
1179                 sdata->rc_rateidx_mask[i] =
1180                         sband ? (1 << sband->n_bitrates) - 1 : 0;
1181         }
1182
1183         /* setup type-dependent data */
1184         ieee80211_setup_sdata(sdata, type);
1185
1186         if (params) {
1187                 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1188                 if (type == NL80211_IFTYPE_STATION)
1189                         sdata->u.mgd.use_4addr = params->use_4addr;
1190         }
1191
1192         ret = register_netdevice(ndev);
1193         if (ret)
1194                 goto fail;
1195
1196         if (ieee80211_vif_is_mesh(&sdata->vif) &&
1197             params && params->mesh_id_len)
1198                 ieee80211_sdata_set_mesh_id(sdata,
1199                                             params->mesh_id_len,
1200                                             params->mesh_id);
1201
1202         mutex_lock(&local->iflist_mtx);
1203         list_add_tail_rcu(&sdata->list, &local->interfaces);
1204         mutex_unlock(&local->iflist_mtx);
1205
1206         if (new_dev)
1207                 *new_dev = ndev;
1208
1209         return 0;
1210
1211  fail:
1212         free_netdev(ndev);
1213         return ret;
1214 }
1215
1216 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1217 {
1218         ASSERT_RTNL();
1219
1220         mutex_lock(&sdata->local->iflist_mtx);
1221         list_del_rcu(&sdata->list);
1222         mutex_unlock(&sdata->local->iflist_mtx);
1223
1224         synchronize_rcu();
1225         unregister_netdevice(sdata->dev);
1226 }
1227
1228 /*
1229  * Remove all interfaces, may only be called at hardware unregistration
1230  * time because it doesn't do RCU-safe list removals.
1231  */
1232 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1233 {
1234         struct ieee80211_sub_if_data *sdata, *tmp;
1235         LIST_HEAD(unreg_list);
1236
1237         ASSERT_RTNL();
1238
1239         mutex_lock(&local->iflist_mtx);
1240         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1241                 list_del(&sdata->list);
1242
1243                 unregister_netdevice_queue(sdata->dev, &unreg_list);
1244         }
1245         mutex_unlock(&local->iflist_mtx);
1246         unregister_netdevice_many(&unreg_list);
1247 }
1248
1249 static u32 ieee80211_idle_off(struct ieee80211_local *local,
1250                               const char *reason)
1251 {
1252         if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
1253                 return 0;
1254
1255 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1256         wiphy_debug(local->hw.wiphy, "device no longer idle - %s\n", reason);
1257 #endif
1258
1259         local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
1260         return IEEE80211_CONF_CHANGE_IDLE;
1261 }
1262
1263 static u32 ieee80211_idle_on(struct ieee80211_local *local)
1264 {
1265         if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
1266                 return 0;
1267
1268 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1269         wiphy_debug(local->hw.wiphy, "device now idle\n");
1270 #endif
1271
1272         drv_flush(local, false);
1273
1274         local->hw.conf.flags |= IEEE80211_CONF_IDLE;
1275         return IEEE80211_CONF_CHANGE_IDLE;
1276 }
1277
1278 u32 __ieee80211_recalc_idle(struct ieee80211_local *local)
1279 {
1280         struct ieee80211_sub_if_data *sdata;
1281         int count = 0;
1282         bool working = false, scanning = false;
1283         struct ieee80211_work *wk;
1284
1285 #ifdef CONFIG_PROVE_LOCKING
1286         WARN_ON(debug_locks && !lockdep_rtnl_is_held() &&
1287                 !lockdep_is_held(&local->iflist_mtx));
1288 #endif
1289         lockdep_assert_held(&local->mtx);
1290
1291         list_for_each_entry(sdata, &local->interfaces, list) {
1292                 if (!ieee80211_sdata_running(sdata)) {
1293                         sdata->vif.bss_conf.idle = true;
1294                         continue;
1295                 }
1296
1297                 sdata->old_idle = sdata->vif.bss_conf.idle;
1298
1299                 /* do not count disabled managed interfaces */
1300                 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1301                     !sdata->u.mgd.associated) {
1302                         sdata->vif.bss_conf.idle = true;
1303                         continue;
1304                 }
1305                 /* do not count unused IBSS interfaces */
1306                 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
1307                     !sdata->u.ibss.ssid_len) {
1308                         sdata->vif.bss_conf.idle = true;
1309                         continue;
1310                 }
1311                 /* count everything else */
1312                 count++;
1313         }
1314
1315         list_for_each_entry(wk, &local->work_list, list) {
1316                 working = true;
1317                 wk->sdata->vif.bss_conf.idle = false;
1318         }
1319
1320         if (local->scan_sdata) {
1321                 scanning = true;
1322                 local->scan_sdata->vif.bss_conf.idle = false;
1323         }
1324
1325         list_for_each_entry(sdata, &local->interfaces, list) {
1326                 if (sdata->old_idle == sdata->vif.bss_conf.idle)
1327                         continue;
1328                 if (!ieee80211_sdata_running(sdata))
1329                         continue;
1330                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_IDLE);
1331         }
1332
1333         if (working)
1334                 return ieee80211_idle_off(local, "working");
1335         if (scanning)
1336                 return ieee80211_idle_off(local, "scanning");
1337         if (!count)
1338                 return ieee80211_idle_on(local);
1339         else
1340                 return ieee80211_idle_off(local, "in use");
1341
1342         return 0;
1343 }
1344
1345 void ieee80211_recalc_idle(struct ieee80211_local *local)
1346 {
1347         u32 chg;
1348
1349         mutex_lock(&local->iflist_mtx);
1350         chg = __ieee80211_recalc_idle(local);
1351         mutex_unlock(&local->iflist_mtx);
1352         if (chg)
1353                 ieee80211_hw_config(local, chg);
1354 }
1355
1356 static int netdev_notify(struct notifier_block *nb,
1357                          unsigned long state,
1358                          void *ndev)
1359 {
1360         struct net_device *dev = ndev;
1361         struct ieee80211_sub_if_data *sdata;
1362
1363         if (state != NETDEV_CHANGENAME)
1364                 return 0;
1365
1366         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1367                 return 0;
1368
1369         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1370                 return 0;
1371
1372         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1373
1374         memcpy(sdata->name, dev->name, IFNAMSIZ);
1375
1376         ieee80211_debugfs_rename_netdev(sdata);
1377         return 0;
1378 }
1379
1380 static struct notifier_block mac80211_netdev_notifier = {
1381         .notifier_call = netdev_notify,
1382 };
1383
1384 int ieee80211_iface_init(void)
1385 {
1386         return register_netdevice_notifier(&mac80211_netdev_notifier);
1387 }
1388
1389 void ieee80211_iface_exit(void)
1390 {
1391         unregister_netdevice_notifier(&mac80211_netdev_notifier);
1392 }