net/mac80211/iface.c

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