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         if (local->scan_sdata == sdata)
 388                 ieee80211_scan_cancel(local);
 389
 390         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 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 = sdata->u.ap.beacon;
 453
 454                 /* sdata_running will return false, so this will disable */
 455                 ieee80211_bss_info_change_notify(sdata,
 456                                                  BSS_CHANGED_BEACON_ENABLED);
 457
 458                 /* remove beacon */
 459                 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
 460                 synchronize_rcu();
 461                 kfree(old_beacon);
 462
 463                 /* free all potentially still buffered bcast frames */
 464                 while ((skb = skb_dequeue(&sdata->u.ap.ps_bc_buf))) {
 465                         local->total_ps_buffered--;
 466                         dev_kfree_skb(skb);
 467                 }
 468
 469                 /* down all dependent devices, that is VLANs */
 470                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
 471                                          u.vlan.list)
 472                         dev_close(vlan->dev);
 473                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
 474         }
 475
 476         if (going_down)
 477                 local->open_count--;
 478
 479         switch (sdata->vif.type) {
 480         case NL80211_IFTYPE_AP_VLAN:
 481                 list_del(&sdata->u.vlan.list);
 482                 /* no need to tell driver */
 483                 break;
 484         case NL80211_IFTYPE_MONITOR:
 485                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 486                         local->cooked_mntrs--;
 487                         break;
 488                 }
 489
 490                 local->monitors--;
 491                 if (local->monitors == 0) {
 492                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
 493                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 494                 }
 495
 496                 ieee80211_adjust_monitor_flags(sdata, -1);
 497                 ieee80211_configure_filter(local);
 498                 break;
 499         default:
 500                 flush_work(&sdata->work);
 501                 /*
 502                  * When we get here, the interface is marked down.
 503                  * Call synchronize_rcu() to wait for the RX path
 504                  * should it be using the interface and enqueuing
 505                  * frames at this very time on another CPU.
 506                  */
 507                 synchronize_rcu();
 508                 skb_queue_purge(&sdata->skb_queue);
 509
 510                 /*
 511                  * Disable beaconing here for mesh only, AP and IBSS
 512                  * are already taken care of.
 513                  */
 514                 if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
 515                         ieee80211_bss_info_change_notify(sdata,
 516                                 BSS_CHANGED_BEACON_ENABLED);
 517
 518                 /*
 519                  * Free all remaining keys, there shouldn't be any,
 520                  * except maybe group keys in AP more or WDS?
 521                  */
 522                 ieee80211_free_keys(sdata);
 523
 524                 if (going_down)
 525                         drv_remove_interface(local, &sdata->vif);
 526         }
 527
 528         sdata->bss = NULL;
 529
 530         mutex_lock(&local->mtx);
 531         hw_reconf_flags |= __ieee80211_recalc_idle(local);
 532         mutex_unlock(&local->mtx);
 533
 534         ieee80211_recalc_ps(local, -1);
 535
 536         if (local->open_count == 0) {
 537                 if (local->ops->napi_poll)
 538                         napi_disable(&local->napi);
 539                 ieee80211_clear_tx_pending(local);
 540                 ieee80211_stop_device(local);
 541
 542                 /* no reconfiguring after stop! */
 543                 hw_reconf_flags = 0;
 544         }
 545
 546         /* Re-calculate channel-type, in case there are multiple vifs
 547          * on different channel types.
 548          */
 549         orig_ct = local->_oper_channel_type;
 550         ieee80211_set_channel_type(local, NULL, NL80211_CHAN_NO_HT);
 551
 552         /* do after stop to avoid reconfiguring when we stop anyway */
 553         if (hw_reconf_flags || (orig_ct != local->_oper_channel_type))
 554                 ieee80211_hw_config(local, hw_reconf_flags);
 555
 556         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 557         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 558                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
 559                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 560                         if (info->control.vif == &sdata->vif) {
 561                                 __skb_unlink(skb, &local->pending[i]);
 562                                 dev_kfree_skb_irq(skb);
 563                         }
 564                 }
 565         }
 566         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 567 }
 568
 569 static int ieee80211_stop(struct net_device *dev)
 570 {
 571         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 572
 573         ieee80211_do_stop(sdata, true);
 574
 575         return 0;
 576 }
 577
 578 static void ieee80211_set_multicast_list(struct net_device *dev)
 579 {
 580         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 581         struct ieee80211_local *local = sdata->local;
 582         int allmulti, promisc, sdata_allmulti, sdata_promisc;
 583
 584         allmulti = !!(dev->flags & IFF_ALLMULTI);
 585         promisc = !!(dev->flags & IFF_PROMISC);
 586         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
 587         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
 588
 589         if (allmulti != sdata_allmulti) {
 590                 if (dev->flags & IFF_ALLMULTI)
 591                         atomic_inc(&local->iff_allmultis);
 592                 else
 593                         atomic_dec(&local->iff_allmultis);
 594                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
 595         }
 596
 597         if (promisc != sdata_promisc) {
 598                 if (dev->flags & IFF_PROMISC)
 599                         atomic_inc(&local->iff_promiscs);
 600                 else
 601                         atomic_dec(&local->iff_promiscs);
 602                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
 603         }
 604         spin_lock_bh(&local->filter_lock);
 605         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
 606         spin_unlock_bh(&local->filter_lock);
 607         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
 608 }
 609
 610 /*
 611  * Called when the netdev is removed or, by the code below, before
 612  * the interface type changes.
 613  */
 614 static void ieee80211_teardown_sdata(struct net_device *dev)
 615 {
 616         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 617         struct ieee80211_local *local = sdata->local;
 618         int flushed;
 619         int i;
 620
 621         /* free extra data */
 622         ieee80211_free_keys(sdata);
 623
 624         ieee80211_debugfs_remove_netdev(sdata);
 625
 626         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
 627                 __skb_queue_purge(&sdata->fragments[i].skb_list);
 628         sdata->fragment_next = 0;
 629
 630         if (ieee80211_vif_is_mesh(&sdata->vif))
 631                 mesh_rmc_free(sdata);
 632
 633         flushed = sta_info_flush(local, sdata);
 634         WARN_ON(flushed);
 635 }
 636
 637 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
 638                                          struct sk_buff *skb)
 639 {
 640         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
 641 }
 642
 643 static const struct net_device_ops ieee80211_dataif_ops = {
 644         .ndo_open               = ieee80211_open,
 645         .ndo_stop               = ieee80211_stop,
 646         .ndo_uninit             = ieee80211_teardown_sdata,
 647         .ndo_start_xmit         = ieee80211_subif_start_xmit,
 648         .ndo_set_multicast_list = ieee80211_set_multicast_list,
 649         .ndo_change_mtu         = ieee80211_change_mtu,
 650         .ndo_set_mac_address    = ieee80211_change_mac,
 651         .ndo_select_queue       = ieee80211_netdev_select_queue,
 652 };
 653
 654 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
 655                                           struct sk_buff *skb)
 656 {
 657         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 658         struct ieee80211_local *local = sdata->local;
 659         struct ieee80211_hdr *hdr;
 660         struct ieee80211_radiotap_header *rtap = (void *)skb->data;
 661         u8 *p;
 662
 663         if (local->hw.queues < 4)
 664                 return 0;
 665
 666         if (skb->len < 4 ||
 667             skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
 668                 return 0; /* doesn't matter, frame will be dropped */
 669
 670         hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
 671
 672         if (!ieee80211_is_data(hdr->frame_control)) {
 673                 skb->priority = 7;
 674                 return ieee802_1d_to_ac[skb->priority];
 675         }
 676         if (!ieee80211_is_data_qos(hdr->frame_control)) {
 677                 skb->priority = 0;
 678                 return ieee802_1d_to_ac[skb->priority];
 679         }
 680
 681         p = ieee80211_get_qos_ctl(hdr);
 682         skb->priority = *p & IEEE80211_QOS_CTL_TAG1D_MASK;
 683
 684         return ieee80211_downgrade_queue(local, skb);
 685 }
 686
 687 static const struct net_device_ops ieee80211_monitorif_ops = {
 688         .ndo_open               = ieee80211_open,
 689         .ndo_stop               = ieee80211_stop,
 690         .ndo_uninit             = ieee80211_teardown_sdata,
 691         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
 692         .ndo_set_multicast_list = ieee80211_set_multicast_list,
 693         .ndo_change_mtu         = ieee80211_change_mtu,
 694         .ndo_set_mac_address    = eth_mac_addr,
 695         .ndo_select_queue       = ieee80211_monitor_select_queue,
 696 };
 697
 698 static void ieee80211_if_setup(struct net_device *dev)
 699 {
 700         ether_setup(dev);
 701         dev->netdev_ops = &ieee80211_dataif_ops;
 702         dev->destructor = free_netdev;
 703 }
 704
 705 static void ieee80211_iface_work(struct work_struct *work)
 706 {
 707         struct ieee80211_sub_if_data *sdata =
 708                 container_of(work, struct ieee80211_sub_if_data, work);
 709         struct ieee80211_local *local = sdata->local;
 710         struct sk_buff *skb;
 711         struct sta_info *sta;
 712         struct ieee80211_ra_tid *ra_tid;
 713
 714         if (!ieee80211_sdata_running(sdata))
 715                 return;
 716
 717         if (local->scanning)
 718                 return;
 719
 720         /*
 721          * ieee80211_queue_work() should have picked up most cases,
 722          * here we'll pick the rest.
 723          */
 724         if (WARN(local->suspended,
 725                  "interface work scheduled while going to suspend\n"))
 726                 return;
 727
 728         /* first process frames */
 729         while ((skb = skb_dequeue(&sdata->skb_queue))) {
 730                 struct ieee80211_mgmt *mgmt = (void *)skb->data;
 731
 732                 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
 733                         ra_tid = (void *)&skb->cb;
 734                         ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
 735                                                  ra_tid->tid);
 736                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
 737                         ra_tid = (void *)&skb->cb;
 738                         ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
 739                                                 ra_tid->tid);
 740                 } else if (ieee80211_is_action(mgmt->frame_control) &&
 741                            mgmt->u.action.category == WLAN_CATEGORY_BACK) {
 742                         int len = skb->len;
 743
 744                         mutex_lock(&local->sta_mtx);
 745                         sta = sta_info_get_bss(sdata, mgmt->sa);
 746                         if (sta) {
 747                                 switch (mgmt->u.action.u.addba_req.action_code) {
 748                                 case WLAN_ACTION_ADDBA_REQ:
 749                                         ieee80211_process_addba_request(
 750                                                         local, sta, mgmt, len);
 751                                         break;
 752                                 case WLAN_ACTION_ADDBA_RESP:
 753                                         ieee80211_process_addba_resp(local, sta,
 754                                                                      mgmt, len);
 755                                         break;
 756                                 case WLAN_ACTION_DELBA:
 757                                         ieee80211_process_delba(sdata, sta,
 758                                                                 mgmt, len);
 759                                         break;
 760                                 default:
 761                                         WARN_ON(1);
 762                                         break;
 763                                 }
 764                         }
 765                         mutex_unlock(&local->sta_mtx);
 766                 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
 767                         struct ieee80211_hdr *hdr = (void *)mgmt;
 768                         /*
 769                          * So the frame isn't mgmt, but frame_control
 770                          * is at the right place anyway, of course, so
 771                          * the if statement is correct.
 772                          *
 773                          * Warn if we have other data frame types here,
 774                          * they must not get here.
 775                          */
 776                         WARN_ON(hdr->frame_control &
 777                                         cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
 778                         WARN_ON(!(hdr->seq_ctrl &
 779                                         cpu_to_le16(IEEE80211_SCTL_FRAG)));
 780                         /*
 781                          * This was a fragment of a frame, received while
 782                          * a block-ack session was active. That cannot be
 783                          * right, so terminate the session.
 784                          */
 785                         mutex_lock(&local->sta_mtx);
 786                         sta = sta_info_get_bss(sdata, mgmt->sa);
 787                         if (sta) {
 788                                 u16 tid = *ieee80211_get_qos_ctl(hdr) &
 789                                                 IEEE80211_QOS_CTL_TID_MASK;
 790
 791                                 __ieee80211_stop_rx_ba_session(
 792                                         sta, tid, WLAN_BACK_RECIPIENT,
 793                                         WLAN_REASON_QSTA_REQUIRE_SETUP,
 794                                         true);
 795                         }
 796                         mutex_unlock(&local->sta_mtx);
 797                 } else switch (sdata->vif.type) {
 798                 case NL80211_IFTYPE_STATION:
 799                         ieee80211_sta_rx_queued_mgmt(sdata, skb);
 800                         break;
 801                 case NL80211_IFTYPE_ADHOC:
 802                         ieee80211_ibss_rx_queued_mgmt(sdata, skb);
 803                         break;
 804                 case NL80211_IFTYPE_MESH_POINT:
 805                         if (!ieee80211_vif_is_mesh(&sdata->vif))
 806                                 break;
 807                         ieee80211_mesh_rx_queued_mgmt(sdata, skb);
 808                         break;
 809                 default:
 810                         WARN(1, "frame for unexpected interface type");
 811                         break;
 812                 }
 813
 814                 kfree_skb(skb);
 815         }
 816
 817         /* then other type-dependent work */
 818         switch (sdata->vif.type) {
 819         case NL80211_IFTYPE_STATION:
 820                 ieee80211_sta_work(sdata);
 821                 break;
 822         case NL80211_IFTYPE_ADHOC:
 823                 ieee80211_ibss_work(sdata);
 824                 break;
 825         case NL80211_IFTYPE_MESH_POINT:
 826                 if (!ieee80211_vif_is_mesh(&sdata->vif))
 827                         break;
 828                 ieee80211_mesh_work(sdata);
 829                 break;
 830         default:
 831                 break;
 832         }
 833 }
 834
 835
 836 /*
 837  * Helper function to initialise an interface to a specific type.
 838  */
 839 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
 840                                   enum nl80211_iftype type)
 841 {
 842         /* clear type-dependent union */
 843         memset(&sdata->u, 0, sizeof(sdata->u));
 844
 845         /* and set some type-dependent values */
 846         sdata->vif.type = type;
 847         sdata->vif.p2p = false;
 848         sdata->dev->netdev_ops = &ieee80211_dataif_ops;
 849         sdata->wdev.iftype = type;
 850
 851         sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
 852         sdata->control_port_no_encrypt = false;
 853
 854         /* only monitor differs */
 855         sdata->dev->type = ARPHRD_ETHER;
 856
 857         skb_queue_head_init(&sdata->skb_queue);
 858         INIT_WORK(&sdata->work, ieee80211_iface_work);
 859
 860         switch (type) {
 861         case NL80211_IFTYPE_P2P_GO:
 862                 type = NL80211_IFTYPE_AP;
 863                 sdata->vif.type = type;
 864                 sdata->vif.p2p = true;
 865                 /* fall through */
 866         case NL80211_IFTYPE_AP:
 867                 skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
 868                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
 869                 break;
 870         case NL80211_IFTYPE_P2P_CLIENT:
 871                 type = NL80211_IFTYPE_STATION;
 872                 sdata->vif.type = type;
 873                 sdata->vif.p2p = true;
 874                 /* fall through */
 875         case NL80211_IFTYPE_STATION:
 876                 ieee80211_sta_setup_sdata(sdata);
 877                 break;
 878         case NL80211_IFTYPE_ADHOC:
 879                 ieee80211_ibss_setup_sdata(sdata);
 880                 break;
 881         case NL80211_IFTYPE_MESH_POINT:
 882                 if (ieee80211_vif_is_mesh(&sdata->vif))
 883                         ieee80211_mesh_init_sdata(sdata);
 884                 break;
 885         case NL80211_IFTYPE_MONITOR:
 886                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
 887                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
 888                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
 889                                       MONITOR_FLAG_OTHER_BSS;
 890                 break;
 891         case NL80211_IFTYPE_WDS:
 892         case NL80211_IFTYPE_AP_VLAN:
 893                 break;
 894         case NL80211_IFTYPE_UNSPECIFIED:
 895         case NUM_NL80211_IFTYPES:
 896                 BUG();
 897                 break;
 898         }
 899
 900         ieee80211_debugfs_add_netdev(sdata);
 901 }
 902
 903 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
 904                                            enum nl80211_iftype type)
 905 {
 906         struct ieee80211_local *local = sdata->local;
 907         int ret, err;
 908         enum nl80211_iftype internal_type = type;
 909         bool p2p = false;
 910
 911         ASSERT_RTNL();
 912
 913         if (!local->ops->change_interface)
 914                 return -EBUSY;
 915
 916         switch (sdata->vif.type) {
 917         case NL80211_IFTYPE_AP:
 918         case NL80211_IFTYPE_STATION:
 919         case NL80211_IFTYPE_ADHOC:
 920                 /*
 921                  * Could maybe also all others here?
 922                  * Just not sure how that interacts
 923                  * with the RX/config path e.g. for
 924                  * mesh.
 925                  */
 926                 break;
 927         default:
 928                 return -EBUSY;
 929         }
 930
 931         switch (type) {
 932         case NL80211_IFTYPE_AP:
 933         case NL80211_IFTYPE_STATION:
 934         case NL80211_IFTYPE_ADHOC:
 935                 /*
 936                  * Could probably support everything
 937                  * but WDS here (WDS do_open can fail
 938                  * under memory pressure, which this
 939                  * code isn't prepared to handle).
 940                  */
 941                 break;
 942         case NL80211_IFTYPE_P2P_CLIENT:
 943                 p2p = true;
 944                 internal_type = NL80211_IFTYPE_STATION;
 945                 break;
 946         case NL80211_IFTYPE_P2P_GO:
 947                 p2p = true;
 948                 internal_type = NL80211_IFTYPE_AP;
 949                 break;
 950         default:
 951                 return -EBUSY;
 952         }
 953
 954         ret = ieee80211_check_concurrent_iface(sdata, internal_type);
 955         if (ret)
 956                 return ret;
 957
 958         ieee80211_do_stop(sdata, false);
 959
 960         ieee80211_teardown_sdata(sdata->dev);
 961
 962         ret = drv_change_interface(local, sdata, internal_type, p2p);
 963         if (ret)
 964                 type = sdata->vif.type;
 965
 966         ieee80211_setup_sdata(sdata, type);
 967
 968         err = ieee80211_do_open(sdata->dev, false);
 969         WARN(err, "type change: do_open returned %d", err);
 970
 971         return ret;
 972 }
 973
 974 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
 975                              enum nl80211_iftype type)
 976 {
 977         int ret;
 978
 979         ASSERT_RTNL();
 980
 981         if (type == ieee80211_vif_type_p2p(&sdata->vif))
 982                 return 0;
 983
 984         /* Setting ad-hoc mode on non-IBSS channel is not supported. */
 985         if (sdata->local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS &&
 986             type == NL80211_IFTYPE_ADHOC)
 987                 return -EOPNOTSUPP;
 988
 989         if (ieee80211_sdata_running(sdata)) {
 990                 ret = ieee80211_runtime_change_iftype(sdata, type);
 991                 if (ret)
 992                         return ret;
 993         } else {
 994                 /* Purge and reset type-dependent state. */
 995                 ieee80211_teardown_sdata(sdata->dev);
 996                 ieee80211_setup_sdata(sdata, type);
 997         }
 998
 999         /* reset some values that shouldn't be kept across type changes */
1000         sdata->vif.bss_conf.basic_rates =
1001                 ieee80211_mandatory_rates(sdata->local,
1002                         sdata->local->hw.conf.channel->band);
1003         sdata->drop_unencrypted = 0;
1004         if (type == NL80211_IFTYPE_STATION)
1005                 sdata->u.mgd.use_4addr = false;
1006
1007         return 0;
1008 }
1009
1010 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1011                                        struct net_device *dev,
1012                                        enum nl80211_iftype type)
1013 {
1014         struct ieee80211_sub_if_data *sdata;
1015         u64 mask, start, addr, val, inc;
1016         u8 *m;
1017         u8 tmp_addr[ETH_ALEN];
1018         int i;
1019
1020         /* default ... something at least */
1021         memcpy(dev->perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1022
1023         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1024             local->hw.wiphy->n_addresses <= 1)
1025                 return;
1026
1027
1028         mutex_lock(&local->iflist_mtx);
1029
1030         switch (type) {
1031         case NL80211_IFTYPE_MONITOR:
1032                 /* doesn't matter */
1033                 break;
1034         case NL80211_IFTYPE_WDS:
1035         case NL80211_IFTYPE_AP_VLAN:
1036                 /* match up with an AP interface */
1037                 list_for_each_entry(sdata, &local->interfaces, list) {
1038                         if (sdata->vif.type != NL80211_IFTYPE_AP)
1039                                 continue;
1040                         memcpy(dev->perm_addr, sdata->vif.addr, ETH_ALEN);
1041                         break;
1042                 }
1043                 /* keep default if no AP interface present */
1044                 break;
1045         default:
1046                 /* assign a new address if possible -- try n_addresses first */
1047                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1048                         bool used = false;
1049
1050                         list_for_each_entry(sdata, &local->interfaces, list) {
1051                                 if (memcmp(local->hw.wiphy->addresses[i].addr,
1052                                            sdata->vif.addr, ETH_ALEN) == 0) {
1053                                         used = true;
1054                                         break;
1055                                 }
1056                         }
1057
1058                         if (!used) {
1059                                 memcpy(dev->perm_addr,
1060                                        local->hw.wiphy->addresses[i].addr,
1061                                        ETH_ALEN);
1062                                 break;
1063                         }
1064                 }
1065
1066                 /* try mask if available */
1067                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1068                         break;
1069
1070                 m = local->hw.wiphy->addr_mask;
1071                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1072                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1073                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1074
1075                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1076                         /* not a contiguous mask ... not handled now! */
1077                         printk(KERN_DEBUG "not contiguous\n");
1078                         break;
1079                 }
1080
1081                 m = local->hw.wiphy->perm_addr;
1082                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1083                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1084                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1085
1086                 inc = 1ULL<<__ffs64(mask);
1087                 val = (start & mask);
1088                 addr = (start & ~mask) | (val & mask);
1089                 do {
1090                         bool used = false;
1091
1092                         tmp_addr[5] = addr >> 0*8;
1093                         tmp_addr[4] = addr >> 1*8;
1094                         tmp_addr[3] = addr >> 2*8;
1095                         tmp_addr[2] = addr >> 3*8;
1096                         tmp_addr[1] = addr >> 4*8;
1097                         tmp_addr[0] = addr >> 5*8;
1098
1099                         val += inc;
1100
1101                         list_for_each_entry(sdata, &local->interfaces, list) {
1102                                 if (memcmp(tmp_addr, sdata->vif.addr,
1103                                                         ETH_ALEN) == 0) {
1104                                         used = true;
1105                                         break;
1106                                 }
1107                         }
1108
1109                         if (!used) {
1110                                 memcpy(dev->perm_addr, tmp_addr, ETH_ALEN);
1111                                 break;
1112                         }
1113                         addr = (start & ~mask) | (val & mask);
1114                 } while (addr != start);
1115
1116                 break;
1117         }
1118
1119         mutex_unlock(&local->iflist_mtx);
1120 }
1121
1122 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1123                      struct net_device **new_dev, enum nl80211_iftype type,
1124                      struct vif_params *params)
1125 {
1126         struct net_device *ndev;
1127         struct ieee80211_sub_if_data *sdata = NULL;
1128         int ret, i;
1129
1130         ASSERT_RTNL();
1131
1132         ndev = alloc_netdev_mq(sizeof(*sdata) + local->hw.vif_data_size,
1133                                name, ieee80211_if_setup, local->hw.queues);
1134         if (!ndev)
1135                 return -ENOMEM;
1136         dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1137
1138         ndev->needed_headroom = local->tx_headroom +
1139                                 4*6 /* four MAC addresses */
1140                                 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1141                                 + 6 /* mesh */
1142                                 + 8 /* rfc1042/bridge tunnel */
1143                                 - ETH_HLEN /* ethernet hard_header_len */
1144                                 + IEEE80211_ENCRYPT_HEADROOM;
1145         ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1146
1147         ret = dev_alloc_name(ndev, ndev->name);
1148         if (ret < 0)
1149                 goto fail;
1150
1151         ieee80211_assign_perm_addr(local, ndev, type);
1152         memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1153         SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1154
1155         /* don't use IEEE80211_DEV_TO_SUB_IF because it checks too much */
1156         sdata = netdev_priv(ndev);
1157         ndev->ieee80211_ptr = &sdata->wdev;
1158         memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1159         memcpy(sdata->name, ndev->name, IFNAMSIZ);
1160
1161         /* initialise type-independent data */
1162         sdata->wdev.wiphy = local->hw.wiphy;
1163         sdata->local = local;
1164         sdata->dev = ndev;
1165 #ifdef CONFIG_INET
1166         sdata->arp_filter_state = true;
1167 #endif
1168
1169         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1170                 skb_queue_head_init(&sdata->fragments[i].skb_list);
1171
1172         INIT_LIST_HEAD(&sdata->key_list);
1173
1174         for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1175                 struct ieee80211_supported_band *sband;
1176                 sband = local->hw.wiphy->bands[i];
1177                 sdata->rc_rateidx_mask[i] =
1178                         sband ? (1 << sband->n_bitrates) - 1 : 0;
1179         }
1180
1181         /* setup type-dependent data */
1182         ieee80211_setup_sdata(sdata, type);
1183
1184         if (params) {
1185                 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1186                 if (type == NL80211_IFTYPE_STATION)
1187                         sdata->u.mgd.use_4addr = params->use_4addr;
1188         }
1189
1190         ret = register_netdevice(ndev);
1191         if (ret)
1192                 goto fail;
1193
1194         mutex_lock(&local->iflist_mtx);
1195         list_add_tail_rcu(&sdata->list, &local->interfaces);
1196         mutex_unlock(&local->iflist_mtx);
1197
1198         if (new_dev)
1199                 *new_dev = ndev;
1200
1201         return 0;
1202
1203  fail:
1204         free_netdev(ndev);
1205         return ret;
1206 }
1207
1208 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1209 {
1210         ASSERT_RTNL();
1211
1212         mutex_lock(&sdata->local->iflist_mtx);
1213         list_del_rcu(&sdata->list);
1214         mutex_unlock(&sdata->local->iflist_mtx);
1215
1216         synchronize_rcu();
1217         unregister_netdevice(sdata->dev);
1218 }
1219
1220 /*
1221  * Remove all interfaces, may only be called at hardware unregistration
1222  * time because it doesn't do RCU-safe list removals.
1223  */
1224 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1225 {
1226         struct ieee80211_sub_if_data *sdata, *tmp;
1227         LIST_HEAD(unreg_list);
1228
1229         ASSERT_RTNL();
1230
1231         mutex_lock(&local->iflist_mtx);
1232         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1233                 list_del(&sdata->list);
1234
1235                 unregister_netdevice_queue(sdata->dev, &unreg_list);
1236         }
1237         mutex_unlock(&local->iflist_mtx);
1238         unregister_netdevice_many(&unreg_list);
1239         list_del(&unreg_list);
1240 }
1241
1242 static u32 ieee80211_idle_off(struct ieee80211_local *local,
1243                               const char *reason)
1244 {
1245         if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
1246                 return 0;
1247
1248 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1249         wiphy_debug(local->hw.wiphy, "device no longer idle - %s\n", reason);
1250 #endif
1251
1252         local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
1253         return IEEE80211_CONF_CHANGE_IDLE;
1254 }
1255
1256 static u32 ieee80211_idle_on(struct ieee80211_local *local)
1257 {
1258         if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
1259                 return 0;
1260
1261 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1262         wiphy_debug(local->hw.wiphy, "device now idle\n");
1263 #endif
1264
1265         drv_flush(local, false);
1266
1267         local->hw.conf.flags |= IEEE80211_CONF_IDLE;
1268         return IEEE80211_CONF_CHANGE_IDLE;
1269 }
1270
1271 u32 __ieee80211_recalc_idle(struct ieee80211_local *local)
1272 {
1273         struct ieee80211_sub_if_data *sdata;
1274         int count = 0;
1275         bool working = false, scanning = false, hw_roc = false;
1276         struct ieee80211_work *wk;
1277         unsigned int led_trig_start = 0, led_trig_stop = 0;
1278
1279 #ifdef CONFIG_PROVE_LOCKING
1280         WARN_ON(debug_locks && !lockdep_rtnl_is_held() &&
1281                 !lockdep_is_held(&local->iflist_mtx));
1282 #endif
1283         lockdep_assert_held(&local->mtx);
1284
1285         list_for_each_entry(sdata, &local->interfaces, list) {
1286                 if (!ieee80211_sdata_running(sdata)) {
1287                         sdata->vif.bss_conf.idle = true;
1288                         continue;
1289                 }
1290
1291                 sdata->old_idle = sdata->vif.bss_conf.idle;
1292
1293                 /* do not count disabled managed interfaces */
1294                 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1295                     !sdata->u.mgd.associated) {
1296                         sdata->vif.bss_conf.idle = true;
1297                         continue;
1298                 }
1299                 /* do not count unused IBSS interfaces */
1300                 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
1301                     !sdata->u.ibss.ssid_len) {
1302                         sdata->vif.bss_conf.idle = true;
1303                         continue;
1304                 }
1305                 /* count everything else */
1306                 count++;
1307         }
1308
1309         list_for_each_entry(wk, &local->work_list, list) {
1310                 working = true;
1311                 wk->sdata->vif.bss_conf.idle = false;
1312         }
1313
1314         if (local->scan_sdata) {
1315                 scanning = true;
1316                 local->scan_sdata->vif.bss_conf.idle = false;
1317         }
1318
1319         if (local->hw_roc_channel)
1320                 hw_roc = true;
1321
1322         list_for_each_entry(sdata, &local->interfaces, list) {
1323                 if (sdata->old_idle == sdata->vif.bss_conf.idle)
1324                         continue;
1325                 if (!ieee80211_sdata_running(sdata))
1326                         continue;
1327                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_IDLE);
1328         }
1329
1330         if (working || scanning || hw_roc)
1331                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
1332         else
1333                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
1334
1335         if (count)
1336                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
1337         else
1338                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
1339
1340         ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
1341
1342         if (hw_roc)
1343                 return ieee80211_idle_off(local, "hw remain-on-channel");
1344         if (working)
1345                 return ieee80211_idle_off(local, "working");
1346         if (scanning)
1347                 return ieee80211_idle_off(local, "scanning");
1348         if (!count)
1349                 return ieee80211_idle_on(local);
1350         else
1351                 return ieee80211_idle_off(local, "in use");
1352
1353         return 0;
1354 }
1355
1356 void ieee80211_recalc_idle(struct ieee80211_local *local)
1357 {
1358         u32 chg;
1359
1360         mutex_lock(&local->iflist_mtx);
1361         chg = __ieee80211_recalc_idle(local);
1362         mutex_unlock(&local->iflist_mtx);
1363         if (chg)
1364                 ieee80211_hw_config(local, chg);
1365 }
1366
1367 static int netdev_notify(struct notifier_block *nb,
1368                          unsigned long state,
1369                          void *ndev)
1370 {
1371         struct net_device *dev = ndev;
1372         struct ieee80211_sub_if_data *sdata;
1373
1374         if (state != NETDEV_CHANGENAME)
1375                 return 0;
1376
1377         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1378                 return 0;
1379
1380         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1381                 return 0;
1382
1383         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1384
1385         memcpy(sdata->name, dev->name, IFNAMSIZ);
1386
1387         ieee80211_debugfs_rename_netdev(sdata);
1388         return 0;
1389 }
1390
1391 static struct notifier_block mac80211_netdev_notifier = {
1392         .notifier_call = netdev_notify,
1393 };
1394
1395 int ieee80211_iface_init(void)
1396 {
1397         return register_netdevice_notifier(&mac80211_netdev_notifier);
1398 }
1399
1400 void ieee80211_iface_exit(void)
1401 {
1402         unregister_netdevice_notifier(&mac80211_netdev_notifier);
1403 }