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                 struct ieee80211_sub_if_data *master;
 193
 194                 if (!sdata->bss)
 195                         return -ENOLINK;
 196
 197                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
 198
 199                 master = container_of(sdata->bss,
 200                                       struct ieee80211_sub_if_data, u.ap);
 201                 sdata->control_port_protocol =
 202                         master->control_port_protocol;
 203                 sdata->control_port_no_encrypt =
 204                         master->control_port_no_encrypt;
 205                 break;
 206                 }
 207         case NL80211_IFTYPE_AP:
 208                 sdata->bss = &sdata->u.ap;
 209                 break;
 210         case NL80211_IFTYPE_MESH_POINT:
 211         case NL80211_IFTYPE_STATION:
 212         case NL80211_IFTYPE_MONITOR:
 213         case NL80211_IFTYPE_ADHOC:
 214                 /* no special treatment */
 215                 break;
 216         case NL80211_IFTYPE_UNSPECIFIED:
 217         case NUM_NL80211_IFTYPES:
 218         case NL80211_IFTYPE_P2P_CLIENT:
 219         case NL80211_IFTYPE_P2P_GO:
 220                 /* cannot happen */
 221                 WARN_ON(1);
 222                 break;
 223         }
 224
 225         if (local->open_count == 0) {
 226                 res = drv_start(local);
 227                 if (res)
 228                         goto err_del_bss;
 229                 if (local->ops->napi_poll)
 230                         napi_enable(&local->napi);
 231                 /* we're brought up, everything changes */
 232                 hw_reconf_flags = ~0;
 233                 ieee80211_led_radio(local, true);
 234                 ieee80211_mod_tpt_led_trig(local,
 235                                            IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
 236         }
 237
 238         /*
 239          * Copy the hopefully now-present MAC address to
 240          * this interface, if it has the special null one.
 241          */
 242         if (is_zero_ether_addr(dev->dev_addr)) {
 243                 memcpy(dev->dev_addr,
 244                        local->hw.wiphy->perm_addr,
 245                        ETH_ALEN);
 246                 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
 247
 248                 if (!is_valid_ether_addr(dev->dev_addr)) {
 249                         if (!local->open_count)
 250                                 drv_stop(local);
 251                         return -EADDRNOTAVAIL;
 252                 }
 253         }
 254
 255         switch (sdata->vif.type) {
 256         case NL80211_IFTYPE_AP_VLAN:
 257                 /* no need to tell driver */
 258                 break;
 259         case NL80211_IFTYPE_MONITOR:
 260                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 261                         local->cooked_mntrs++;
 262                         break;
 263                 }
 264
 265                 /* must be before the call to ieee80211_configure_filter */
 266                 local->monitors++;
 267                 if (local->monitors == 1) {
 268                         local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
 269                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 270                 }
 271
 272                 ieee80211_adjust_monitor_flags(sdata, 1);
 273                 ieee80211_configure_filter(local);
 274
 275                 netif_carrier_on(dev);
 276                 break;
 277         default:
 278                 if (coming_up) {
 279                         res = drv_add_interface(local, sdata);
 280                         if (res)
 281                                 goto err_stop;
 282                 }
 283
 284                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
 285                         local->fif_pspoll++;
 286                         local->fif_probe_req++;
 287
 288                         ieee80211_configure_filter(local);
 289                 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 290                         local->fif_probe_req++;
 291                 }
 292
 293                 changed |= ieee80211_reset_erp_info(sdata);
 294                 ieee80211_bss_info_change_notify(sdata, changed);
 295
 296                 if (sdata->vif.type == NL80211_IFTYPE_STATION ||
 297                     sdata->vif.type == NL80211_IFTYPE_ADHOC)
 298                         netif_carrier_off(dev);
 299                 else
 300                         netif_carrier_on(dev);
 301
 302                 /*
 303                  * set default queue parameters so drivers don't
 304                  * need to initialise the hardware if the hardware
 305                  * doesn't start up with sane defaults
 306                  */
 307                 ieee80211_set_wmm_default(sdata);
 308         }
 309
 310         set_bit(SDATA_STATE_RUNNING, &sdata->state);
 311
 312         if (sdata->vif.type == NL80211_IFTYPE_WDS) {
 313                 /* Create STA entry for the WDS peer */
 314                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
 315                                      GFP_KERNEL);
 316                 if (!sta) {
 317                         res = -ENOMEM;
 318                         goto err_del_interface;
 319                 }
 320
 321                 sta_info_move_state(sta, IEEE80211_STA_AUTH);
 322                 sta_info_move_state(sta, IEEE80211_STA_ASSOC);
 323                 sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED);
 324
 325                 res = sta_info_insert(sta);
 326                 if (res) {
 327                         /* STA has been freed */
 328                         goto err_del_interface;
 329                 }
 330
 331                 rate_control_rate_init(sta);
 332         }
 333
 334         /*
 335          * set_multicast_list will be invoked by the networking core
 336          * which will check whether any increments here were done in
 337          * error and sync them down to the hardware as filter flags.
 338          */
 339         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 340                 atomic_inc(&local->iff_allmultis);
 341
 342         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 343                 atomic_inc(&local->iff_promiscs);
 344
 345         mutex_lock(&local->mtx);
 346         hw_reconf_flags |= __ieee80211_recalc_idle(local);
 347         mutex_unlock(&local->mtx);
 348
 349         if (coming_up)
 350                 local->open_count++;
 351
 352         if (hw_reconf_flags)
 353                 ieee80211_hw_config(local, hw_reconf_flags);
 354
 355         ieee80211_recalc_ps(local, -1);
 356
 357         netif_tx_start_all_queues(dev);
 358
 359         return 0;
 360  err_del_interface:
 361         drv_remove_interface(local, sdata);
 362  err_stop:
 363         if (!local->open_count)
 364                 drv_stop(local);
 365  err_del_bss:
 366         sdata->bss = NULL;
 367         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
 368                 list_del(&sdata->u.vlan.list);
 369         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 370         return res;
 371 }
 372
 373 static int ieee80211_open(struct net_device *dev)
 374 {
 375         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 376         int err;
 377
 378         /* fail early if user set an invalid address */
 379         if (!is_valid_ether_addr(dev->dev_addr))
 380                 return -EADDRNOTAVAIL;
 381
 382         err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
 383         if (err)
 384                 return err;
 385
 386         return ieee80211_do_open(dev, true);
 387 }
 388
 389 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
 390                               bool going_down)
 391 {
 392         struct ieee80211_local *local = sdata->local;
 393         unsigned long flags;
 394         struct sk_buff *skb, *tmp;
 395         u32 hw_reconf_flags = 0;
 396         int i;
 397         enum nl80211_channel_type orig_ct;
 398
 399         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 400
 401         if (local->scan_sdata == sdata)
 402                 ieee80211_scan_cancel(local);
 403
 404         /*
 405          * Stop TX on this interface first.
 406          */
 407         netif_tx_stop_all_queues(sdata->dev);
 408
 409         /*
 410          * Purge work for this interface.
 411          */
 412         ieee80211_work_purge(sdata);
 413
 414         /*
 415          * Remove all stations associated with this interface.
 416          *
 417          * This must be done before calling ops->remove_interface()
 418          * because otherwise we can later invoke ops->sta_notify()
 419          * whenever the STAs are removed, and that invalidates driver
 420          * assumptions about always getting a vif pointer that is valid
 421          * (because if we remove a STA after ops->remove_interface()
 422          * the driver will have removed the vif info already!)
 423          *
 424          * This is relevant only in AP, WDS and mesh modes, since in
 425          * all other modes we've already removed all stations when
 426          * disconnecting etc.
 427          */
 428         sta_info_flush(local, sdata);
 429
 430         /*
 431          * Don't count this interface for promisc/allmulti while it
 432          * is down. dev_mc_unsync() will invoke set_multicast_list
 433          * on the master interface which will sync these down to the
 434          * hardware as filter flags.
 435          */
 436         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 437                 atomic_dec(&local->iff_allmultis);
 438
 439         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 440                 atomic_dec(&local->iff_promiscs);
 441
 442         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 443                 local->fif_pspoll--;
 444                 local->fif_probe_req--;
 445         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 446                 local->fif_probe_req--;
 447         }
 448
 449         netif_addr_lock_bh(sdata->dev);
 450         spin_lock_bh(&local->filter_lock);
 451         __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
 452                          sdata->dev->addr_len);
 453         spin_unlock_bh(&local->filter_lock);
 454         netif_addr_unlock_bh(sdata->dev);
 455
 456         ieee80211_configure_filter(local);
 457
 458         del_timer_sync(&local->dynamic_ps_timer);
 459         cancel_work_sync(&local->dynamic_ps_enable_work);
 460
 461         /* APs need special treatment */
 462         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 463                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
 464                 struct beacon_data *old_beacon =
 465                         rtnl_dereference(sdata->u.ap.beacon);
 466                 struct sk_buff *old_probe_resp =
 467                         rtnl_dereference(sdata->u.ap.probe_resp);
 468
 469                 /* sdata_running will return false, so this will disable */
 470                 ieee80211_bss_info_change_notify(sdata,
 471                                                  BSS_CHANGED_BEACON_ENABLED);
 472
 473                 /* remove beacon and probe response */
 474                 RCU_INIT_POINTER(sdata->u.ap.beacon, NULL);
 475                 RCU_INIT_POINTER(sdata->u.ap.probe_resp, NULL);
 476                 synchronize_rcu();
 477                 kfree(old_beacon);
 478                 kfree_skb(old_probe_resp);
 479
 480                 /* down all dependent devices, that is VLANs */
 481                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
 482                                          u.vlan.list)
 483                         dev_close(vlan->dev);
 484                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
 485
 486                 /* free all potentially still buffered bcast frames */
 487                 local->total_ps_buffered -= skb_queue_len(&sdata->u.ap.ps_bc_buf);
 488                 skb_queue_purge(&sdata->u.ap.ps_bc_buf);
 489         }
 490
 491         if (going_down)
 492                 local->open_count--;
 493
 494         switch (sdata->vif.type) {
 495         case NL80211_IFTYPE_AP_VLAN:
 496                 list_del(&sdata->u.vlan.list);
 497                 /* no need to tell driver */
 498                 break;
 499         case NL80211_IFTYPE_MONITOR:
 500                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 501                         local->cooked_mntrs--;
 502                         break;
 503                 }
 504
 505                 local->monitors--;
 506                 if (local->monitors == 0) {
 507                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
 508                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 509                 }
 510
 511                 ieee80211_adjust_monitor_flags(sdata, -1);
 512                 ieee80211_configure_filter(local);
 513                 break;
 514         default:
 515                 flush_work(&sdata->work);
 516                 /*
 517                  * When we get here, the interface is marked down.
 518                  * Call synchronize_rcu() to wait for the RX path
 519                  * should it be using the interface and enqueuing
 520                  * frames at this very time on another CPU.
 521                  */
 522                 synchronize_rcu();
 523                 skb_queue_purge(&sdata->skb_queue);
 524
 525                 /*
 526                  * Disable beaconing here for mesh only, AP and IBSS
 527                  * are already taken care of.
 528                  */
 529                 if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
 530                         ieee80211_bss_info_change_notify(sdata,
 531                                 BSS_CHANGED_BEACON_ENABLED);
 532
 533                 /*
 534                  * Free all remaining keys, there shouldn't be any,
 535                  * except maybe group keys in AP more or WDS?
 536                  */
 537                 ieee80211_free_keys(sdata);
 538
 539                 if (going_down)
 540                         drv_remove_interface(local, sdata);
 541         }
 542
 543         sdata->bss = NULL;
 544
 545         mutex_lock(&local->mtx);
 546         hw_reconf_flags |= __ieee80211_recalc_idle(local);
 547         mutex_unlock(&local->mtx);
 548
 549         ieee80211_recalc_ps(local, -1);
 550
 551         if (local->open_count == 0) {
 552                 if (local->ops->napi_poll)
 553                         napi_disable(&local->napi);
 554                 ieee80211_clear_tx_pending(local);
 555                 ieee80211_stop_device(local);
 556
 557                 /* no reconfiguring after stop! */
 558                 hw_reconf_flags = 0;
 559         }
 560
 561         /* Re-calculate channel-type, in case there are multiple vifs
 562          * on different channel types.
 563          */
 564         orig_ct = local->_oper_channel_type;
 565         ieee80211_set_channel_type(local, NULL, NL80211_CHAN_NO_HT);
 566
 567         /* do after stop to avoid reconfiguring when we stop anyway */
 568         if (hw_reconf_flags || (orig_ct != local->_oper_channel_type))
 569                 ieee80211_hw_config(local, hw_reconf_flags);
 570
 571         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 572         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 573                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
 574                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 575                         if (info->control.vif == &sdata->vif) {
 576                                 __skb_unlink(skb, &local->pending[i]);
 577                                 dev_kfree_skb_irq(skb);
 578                         }
 579                 }
 580         }
 581         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 582 }
 583
 584 static int ieee80211_stop(struct net_device *dev)
 585 {
 586         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 587
 588         ieee80211_do_stop(sdata, true);
 589
 590         return 0;
 591 }
 592
 593 static void ieee80211_set_multicast_list(struct net_device *dev)
 594 {
 595         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 596         struct ieee80211_local *local = sdata->local;
 597         int allmulti, promisc, sdata_allmulti, sdata_promisc;
 598
 599         allmulti = !!(dev->flags & IFF_ALLMULTI);
 600         promisc = !!(dev->flags & IFF_PROMISC);
 601         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
 602         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
 603
 604         if (allmulti != sdata_allmulti) {
 605                 if (dev->flags & IFF_ALLMULTI)
 606                         atomic_inc(&local->iff_allmultis);
 607                 else
 608                         atomic_dec(&local->iff_allmultis);
 609                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
 610         }
 611
 612         if (promisc != sdata_promisc) {
 613                 if (dev->flags & IFF_PROMISC)
 614                         atomic_inc(&local->iff_promiscs);
 615                 else
 616                         atomic_dec(&local->iff_promiscs);
 617                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
 618         }
 619         spin_lock_bh(&local->filter_lock);
 620         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
 621         spin_unlock_bh(&local->filter_lock);
 622         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
 623 }
 624
 625 /*
 626  * Called when the netdev is removed or, by the code below, before
 627  * the interface type changes.
 628  */
 629 static void ieee80211_teardown_sdata(struct net_device *dev)
 630 {
 631         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 632         struct ieee80211_local *local = sdata->local;
 633         int flushed;
 634         int i;
 635
 636         /* free extra data */
 637         ieee80211_free_keys(sdata);
 638
 639         ieee80211_debugfs_remove_netdev(sdata);
 640
 641         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
 642                 __skb_queue_purge(&sdata->fragments[i].skb_list);
 643         sdata->fragment_next = 0;
 644
 645         if (ieee80211_vif_is_mesh(&sdata->vif))
 646                 mesh_rmc_free(sdata);
 647
 648         flushed = sta_info_flush(local, sdata);
 649         WARN_ON(flushed);
 650 }
 651
 652 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
 653                                          struct sk_buff *skb)
 654 {
 655         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
 656 }
 657
 658 static const struct net_device_ops ieee80211_dataif_ops = {
 659         .ndo_open               = ieee80211_open,
 660         .ndo_stop               = ieee80211_stop,
 661         .ndo_uninit             = ieee80211_teardown_sdata,
 662         .ndo_start_xmit         = ieee80211_subif_start_xmit,
 663         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
 664         .ndo_change_mtu         = ieee80211_change_mtu,
 665         .ndo_set_mac_address    = ieee80211_change_mac,
 666         .ndo_select_queue       = ieee80211_netdev_select_queue,
 667 };
 668
 669 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
 670                                           struct sk_buff *skb)
 671 {
 672         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 673         struct ieee80211_local *local = sdata->local;
 674         struct ieee80211_hdr *hdr;
 675         struct ieee80211_radiotap_header *rtap = (void *)skb->data;
 676
 677         if (local->hw.queues < 4)
 678                 return 0;
 679
 680         if (skb->len < 4 ||
 681             skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
 682                 return 0; /* doesn't matter, frame will be dropped */
 683
 684         hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
 685
 686         return ieee80211_select_queue_80211(local, skb, hdr);
 687 }
 688
 689 static const struct net_device_ops ieee80211_monitorif_ops = {
 690         .ndo_open               = ieee80211_open,
 691         .ndo_stop               = ieee80211_stop,
 692         .ndo_uninit             = ieee80211_teardown_sdata,
 693         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
 694         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
 695         .ndo_change_mtu         = ieee80211_change_mtu,
 696         .ndo_set_mac_address    = eth_mac_addr,
 697         .ndo_select_queue       = ieee80211_monitor_select_queue,
 698 };
 699
 700 static void ieee80211_if_setup(struct net_device *dev)
 701 {
 702         ether_setup(dev);
 703         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
 704         dev->netdev_ops = &ieee80211_dataif_ops;
 705         dev->destructor = free_netdev;
 706 }
 707
 708 static void ieee80211_iface_work(struct work_struct *work)
 709 {
 710         struct ieee80211_sub_if_data *sdata =
 711                 container_of(work, struct ieee80211_sub_if_data, work);
 712         struct ieee80211_local *local = sdata->local;
 713         struct sk_buff *skb;
 714         struct sta_info *sta;
 715         struct ieee80211_ra_tid *ra_tid;
 716
 717         if (!ieee80211_sdata_running(sdata))
 718                 return;
 719
 720         if (local->scanning)
 721                 return;
 722
 723         /*
 724          * ieee80211_queue_work() should have picked up most cases,
 725          * here we'll pick the rest.
 726          */
 727         if (WARN(local->suspended,
 728                  "interface work scheduled while going to suspend\n"))
 729                 return;
 730
 731         /* first process frames */
 732         while ((skb = skb_dequeue(&sdata->skb_queue))) {
 733                 struct ieee80211_mgmt *mgmt = (void *)skb->data;
 734
 735                 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
 736                         ra_tid = (void *)&skb->cb;
 737                         ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
 738                                                  ra_tid->tid);
 739                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
 740                         ra_tid = (void *)&skb->cb;
 741                         ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
 742                                                 ra_tid->tid);
 743                 } else if (ieee80211_is_action(mgmt->frame_control) &&
 744                            mgmt->u.action.category == WLAN_CATEGORY_BACK) {
 745                         int len = skb->len;
 746
 747                         mutex_lock(&local->sta_mtx);
 748                         sta = sta_info_get_bss(sdata, mgmt->sa);
 749                         if (sta) {
 750                                 switch (mgmt->u.action.u.addba_req.action_code) {
 751                                 case WLAN_ACTION_ADDBA_REQ:
 752                                         ieee80211_process_addba_request(
 753                                                         local, sta, mgmt, len);
 754                                         break;
 755                                 case WLAN_ACTION_ADDBA_RESP:
 756                                         ieee80211_process_addba_resp(local, sta,
 757                                                                      mgmt, len);
 758                                         break;
 759                                 case WLAN_ACTION_DELBA:
 760                                         ieee80211_process_delba(sdata, sta,
 761                                                                 mgmt, len);
 762                                         break;
 763                                 default:
 764                                         WARN_ON(1);
 765                                         break;
 766                                 }
 767                         }
 768                         mutex_unlock(&local->sta_mtx);
 769                 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
 770                         struct ieee80211_hdr *hdr = (void *)mgmt;
 771                         /*
 772                          * So the frame isn't mgmt, but frame_control
 773                          * is at the right place anyway, of course, so
 774                          * the if statement is correct.
 775                          *
 776                          * Warn if we have other data frame types here,
 777                          * they must not get here.
 778                          */
 779                         WARN_ON(hdr->frame_control &
 780                                         cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
 781                         WARN_ON(!(hdr->seq_ctrl &
 782                                         cpu_to_le16(IEEE80211_SCTL_FRAG)));
 783                         /*
 784                          * This was a fragment of a frame, received while
 785                          * a block-ack session was active. That cannot be
 786                          * right, so terminate the session.
 787                          */
 788                         mutex_lock(&local->sta_mtx);
 789                         sta = sta_info_get_bss(sdata, mgmt->sa);
 790                         if (sta) {
 791                                 u16 tid = *ieee80211_get_qos_ctl(hdr) &
 792                                                 IEEE80211_QOS_CTL_TID_MASK;
 793
 794                                 __ieee80211_stop_rx_ba_session(
 795                                         sta, tid, WLAN_BACK_RECIPIENT,
 796                                         WLAN_REASON_QSTA_REQUIRE_SETUP,
 797                                         true);
 798                         }
 799                         mutex_unlock(&local->sta_mtx);
 800                 } else switch (sdata->vif.type) {
 801                 case NL80211_IFTYPE_STATION:
 802                         ieee80211_sta_rx_queued_mgmt(sdata, skb);
 803                         break;
 804                 case NL80211_IFTYPE_ADHOC:
 805                         ieee80211_ibss_rx_queued_mgmt(sdata, skb);
 806                         break;
 807                 case NL80211_IFTYPE_MESH_POINT:
 808                         if (!ieee80211_vif_is_mesh(&sdata->vif))
 809                                 break;
 810                         ieee80211_mesh_rx_queued_mgmt(sdata, skb);
 811                         break;
 812                 default:
 813                         WARN(1, "frame for unexpected interface type");
 814                         break;
 815                 }
 816
 817                 kfree_skb(skb);
 818         }
 819
 820         /* then other type-dependent work */
 821         switch (sdata->vif.type) {
 822         case NL80211_IFTYPE_STATION:
 823                 ieee80211_sta_work(sdata);
 824                 break;
 825         case NL80211_IFTYPE_ADHOC:
 826                 ieee80211_ibss_work(sdata);
 827                 break;
 828         case NL80211_IFTYPE_MESH_POINT:
 829                 if (!ieee80211_vif_is_mesh(&sdata->vif))
 830                         break;
 831                 ieee80211_mesh_work(sdata);
 832                 break;
 833         default:
 834                 break;
 835         }
 836 }
 837
 838
 839 /*
 840  * Helper function to initialise an interface to a specific type.
 841  */
 842 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
 843                                   enum nl80211_iftype type)
 844 {
 845         /* clear type-dependent union */
 846         memset(&sdata->u, 0, sizeof(sdata->u));
 847
 848         /* and set some type-dependent values */
 849         sdata->vif.type = type;
 850         sdata->vif.p2p = false;
 851         sdata->dev->netdev_ops = &ieee80211_dataif_ops;
 852         sdata->wdev.iftype = type;
 853
 854         sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
 855         sdata->control_port_no_encrypt = false;
 856
 857         sdata->noack_map = 0;
 858
 859         /* only monitor differs */
 860         sdata->dev->type = ARPHRD_ETHER;
 861
 862         skb_queue_head_init(&sdata->skb_queue);
 863         INIT_WORK(&sdata->work, ieee80211_iface_work);
 864
 865         switch (type) {
 866         case NL80211_IFTYPE_P2P_GO:
 867                 type = NL80211_IFTYPE_AP;
 868                 sdata->vif.type = type;
 869                 sdata->vif.p2p = true;
 870                 /* fall through */
 871         case NL80211_IFTYPE_AP:
 872                 skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
 873                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
 874                 break;
 875         case NL80211_IFTYPE_P2P_CLIENT:
 876                 type = NL80211_IFTYPE_STATION;
 877                 sdata->vif.type = type;
 878                 sdata->vif.p2p = true;
 879                 /* fall through */
 880         case NL80211_IFTYPE_STATION:
 881                 ieee80211_sta_setup_sdata(sdata);
 882                 break;
 883         case NL80211_IFTYPE_ADHOC:
 884                 ieee80211_ibss_setup_sdata(sdata);
 885                 break;
 886         case NL80211_IFTYPE_MESH_POINT:
 887                 if (ieee80211_vif_is_mesh(&sdata->vif))
 888                         ieee80211_mesh_init_sdata(sdata);
 889                 break;
 890         case NL80211_IFTYPE_MONITOR:
 891                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
 892                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
 893                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
 894                                       MONITOR_FLAG_OTHER_BSS;
 895                 break;
 896         case NL80211_IFTYPE_WDS:
 897         case NL80211_IFTYPE_AP_VLAN:
 898                 break;
 899         case NL80211_IFTYPE_UNSPECIFIED:
 900         case NUM_NL80211_IFTYPES:
 901                 BUG();
 902                 break;
 903         }
 904
 905         ieee80211_debugfs_add_netdev(sdata);
 906 }
 907
 908 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
 909                                            enum nl80211_iftype type)
 910 {
 911         struct ieee80211_local *local = sdata->local;
 912         int ret, err;
 913         enum nl80211_iftype internal_type = type;
 914         bool p2p = false;
 915
 916         ASSERT_RTNL();
 917
 918         if (!local->ops->change_interface)
 919                 return -EBUSY;
 920
 921         switch (sdata->vif.type) {
 922         case NL80211_IFTYPE_AP:
 923         case NL80211_IFTYPE_STATION:
 924         case NL80211_IFTYPE_ADHOC:
 925                 /*
 926                  * Could maybe also all others here?
 927                  * Just not sure how that interacts
 928                  * with the RX/config path e.g. for
 929                  * mesh.
 930                  */
 931                 break;
 932         default:
 933                 return -EBUSY;
 934         }
 935
 936         switch (type) {
 937         case NL80211_IFTYPE_AP:
 938         case NL80211_IFTYPE_STATION:
 939         case NL80211_IFTYPE_ADHOC:
 940                 /*
 941                  * Could probably support everything
 942                  * but WDS here (WDS do_open can fail
 943                  * under memory pressure, which this
 944                  * code isn't prepared to handle).
 945                  */
 946                 break;
 947         case NL80211_IFTYPE_P2P_CLIENT:
 948                 p2p = true;
 949                 internal_type = NL80211_IFTYPE_STATION;
 950                 break;
 951         case NL80211_IFTYPE_P2P_GO:
 952                 p2p = true;
 953                 internal_type = NL80211_IFTYPE_AP;
 954                 break;
 955         default:
 956                 return -EBUSY;
 957         }
 958
 959         ret = ieee80211_check_concurrent_iface(sdata, internal_type);
 960         if (ret)
 961                 return ret;
 962
 963         ieee80211_do_stop(sdata, false);
 964
 965         ieee80211_teardown_sdata(sdata->dev);
 966
 967         ret = drv_change_interface(local, sdata, internal_type, p2p);
 968         if (ret)
 969                 type = sdata->vif.type;
 970
 971         ieee80211_setup_sdata(sdata, type);
 972
 973         err = ieee80211_do_open(sdata->dev, false);
 974         WARN(err, "type change: do_open returned %d", err);
 975
 976         return ret;
 977 }
 978
 979 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
 980                              enum nl80211_iftype type)
 981 {
 982         int ret;
 983
 984         ASSERT_RTNL();
 985
 986         if (type == ieee80211_vif_type_p2p(&sdata->vif))
 987                 return 0;
 988
 989         /* Setting ad-hoc mode on non-IBSS channel is not supported. */
 990         if (sdata->local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS &&
 991             type == NL80211_IFTYPE_ADHOC)
 992                 return -EOPNOTSUPP;
 993
 994         if (ieee80211_sdata_running(sdata)) {
 995                 ret = ieee80211_runtime_change_iftype(sdata, type);
 996                 if (ret)
 997                         return ret;
 998         } else {
 999                 /* Purge and reset type-dependent state. */
1000                 ieee80211_teardown_sdata(sdata->dev);
1001                 ieee80211_setup_sdata(sdata, type);
1002         }
1003
1004         /* reset some values that shouldn't be kept across type changes */
1005         sdata->vif.bss_conf.basic_rates =
1006                 ieee80211_mandatory_rates(sdata->local,
1007                         sdata->local->hw.conf.channel->band);
1008         sdata->drop_unencrypted = 0;
1009         if (type == NL80211_IFTYPE_STATION)
1010                 sdata->u.mgd.use_4addr = false;
1011
1012         return 0;
1013 }
1014
1015 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1016                                        struct net_device *dev,
1017                                        enum nl80211_iftype type)
1018 {
1019         struct ieee80211_sub_if_data *sdata;
1020         u64 mask, start, addr, val, inc;
1021         u8 *m;
1022         u8 tmp_addr[ETH_ALEN];
1023         int i;
1024
1025         /* default ... something at least */
1026         memcpy(dev->perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1027
1028         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1029             local->hw.wiphy->n_addresses <= 1)
1030                 return;
1031
1032
1033         mutex_lock(&local->iflist_mtx);
1034
1035         switch (type) {
1036         case NL80211_IFTYPE_MONITOR:
1037                 /* doesn't matter */
1038                 break;
1039         case NL80211_IFTYPE_WDS:
1040         case NL80211_IFTYPE_AP_VLAN:
1041                 /* match up with an AP interface */
1042                 list_for_each_entry(sdata, &local->interfaces, list) {
1043                         if (sdata->vif.type != NL80211_IFTYPE_AP)
1044                                 continue;
1045                         memcpy(dev->perm_addr, sdata->vif.addr, ETH_ALEN);
1046                         break;
1047                 }
1048                 /* keep default if no AP interface present */
1049                 break;
1050         default:
1051                 /* assign a new address if possible -- try n_addresses first */
1052                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1053                         bool used = false;
1054
1055                         list_for_each_entry(sdata, &local->interfaces, list) {
1056                                 if (memcmp(local->hw.wiphy->addresses[i].addr,
1057                                            sdata->vif.addr, ETH_ALEN) == 0) {
1058                                         used = true;
1059                                         break;
1060                                 }
1061                         }
1062
1063                         if (!used) {
1064                                 memcpy(dev->perm_addr,
1065                                        local->hw.wiphy->addresses[i].addr,
1066                                        ETH_ALEN);
1067                                 break;
1068                         }
1069                 }
1070
1071                 /* try mask if available */
1072                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1073                         break;
1074
1075                 m = local->hw.wiphy->addr_mask;
1076                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1077                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1078                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1079
1080                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1081                         /* not a contiguous mask ... not handled now! */
1082                         printk(KERN_DEBUG "not contiguous\n");
1083                         break;
1084                 }
1085
1086                 m = local->hw.wiphy->perm_addr;
1087                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1088                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1089                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1090
1091                 inc = 1ULL<<__ffs64(mask);
1092                 val = (start & mask);
1093                 addr = (start & ~mask) | (val & mask);
1094                 do {
1095                         bool used = false;
1096
1097                         tmp_addr[5] = addr >> 0*8;
1098                         tmp_addr[4] = addr >> 1*8;
1099                         tmp_addr[3] = addr >> 2*8;
1100                         tmp_addr[2] = addr >> 3*8;
1101                         tmp_addr[1] = addr >> 4*8;
1102                         tmp_addr[0] = addr >> 5*8;
1103
1104                         val += inc;
1105
1106                         list_for_each_entry(sdata, &local->interfaces, list) {
1107                                 if (memcmp(tmp_addr, sdata->vif.addr,
1108                                                         ETH_ALEN) == 0) {
1109                                         used = true;
1110                                         break;
1111                                 }
1112                         }
1113
1114                         if (!used) {
1115                                 memcpy(dev->perm_addr, tmp_addr, ETH_ALEN);
1116                                 break;
1117                         }
1118                         addr = (start & ~mask) | (val & mask);
1119                 } while (addr != start);
1120
1121                 break;
1122         }
1123
1124         mutex_unlock(&local->iflist_mtx);
1125 }
1126
1127 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1128                      struct net_device **new_dev, enum nl80211_iftype type,
1129                      struct vif_params *params)
1130 {
1131         struct net_device *ndev;
1132         struct ieee80211_sub_if_data *sdata = NULL;
1133         int ret, i;
1134
1135         ASSERT_RTNL();
1136
1137         ndev = alloc_netdev_mqs(sizeof(*sdata) + local->hw.vif_data_size,
1138                                 name, ieee80211_if_setup, local->hw.queues, 1);
1139         if (!ndev)
1140                 return -ENOMEM;
1141         dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1142
1143         ndev->needed_headroom = local->tx_headroom +
1144                                 4*6 /* four MAC addresses */
1145                                 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1146                                 + 6 /* mesh */
1147                                 + 8 /* rfc1042/bridge tunnel */
1148                                 - ETH_HLEN /* ethernet hard_header_len */
1149                                 + IEEE80211_ENCRYPT_HEADROOM;
1150         ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1151
1152         ret = dev_alloc_name(ndev, ndev->name);
1153         if (ret < 0)
1154                 goto fail;
1155
1156         ieee80211_assign_perm_addr(local, ndev, type);
1157         memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1158         SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1159
1160         /* don't use IEEE80211_DEV_TO_SUB_IF because it checks too much */
1161         sdata = netdev_priv(ndev);
1162         ndev->ieee80211_ptr = &sdata->wdev;
1163         memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1164         memcpy(sdata->name, ndev->name, IFNAMSIZ);
1165
1166         /* initialise type-independent data */
1167         sdata->wdev.wiphy = local->hw.wiphy;
1168         sdata->local = local;
1169         sdata->dev = ndev;
1170 #ifdef CONFIG_INET
1171         sdata->arp_filter_state = true;
1172 #endif
1173
1174         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1175                 skb_queue_head_init(&sdata->fragments[i].skb_list);
1176
1177         INIT_LIST_HEAD(&sdata->key_list);
1178
1179         for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1180                 struct ieee80211_supported_band *sband;
1181                 sband = local->hw.wiphy->bands[i];
1182                 sdata->rc_rateidx_mask[i] =
1183                         sband ? (1 << sband->n_bitrates) - 1 : 0;
1184         }
1185
1186         /* setup type-dependent data */
1187         ieee80211_setup_sdata(sdata, type);
1188
1189         if (params) {
1190                 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1191                 if (type == NL80211_IFTYPE_STATION)
1192                         sdata->u.mgd.use_4addr = params->use_4addr;
1193         }
1194
1195         ret = register_netdevice(ndev);
1196         if (ret)
1197                 goto fail;
1198
1199         mutex_lock(&local->iflist_mtx);
1200         list_add_tail_rcu(&sdata->list, &local->interfaces);
1201         mutex_unlock(&local->iflist_mtx);
1202
1203         if (new_dev)
1204                 *new_dev = ndev;
1205
1206         return 0;
1207
1208  fail:
1209         free_netdev(ndev);
1210         return ret;
1211 }
1212
1213 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1214 {
1215         ASSERT_RTNL();
1216
1217         mutex_lock(&sdata->local->iflist_mtx);
1218         list_del_rcu(&sdata->list);
1219         mutex_unlock(&sdata->local->iflist_mtx);
1220
1221         if (ieee80211_vif_is_mesh(&sdata->vif))
1222                 mesh_path_flush_by_iface(sdata);
1223
1224         synchronize_rcu();
1225         unregister_netdevice(sdata->dev);
1226 }
1227
1228 /*
1229  * Remove all interfaces, may only be called at hardware unregistration
1230  * time because it doesn't do RCU-safe list removals.
1231  */
1232 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1233 {
1234         struct ieee80211_sub_if_data *sdata, *tmp;
1235         LIST_HEAD(unreg_list);
1236
1237         ASSERT_RTNL();
1238
1239         mutex_lock(&local->iflist_mtx);
1240         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1241                 list_del(&sdata->list);
1242
1243                 if (ieee80211_vif_is_mesh(&sdata->vif))
1244                         mesh_path_flush_by_iface(sdata);
1245
1246                 unregister_netdevice_queue(sdata->dev, &unreg_list);
1247         }
1248         mutex_unlock(&local->iflist_mtx);
1249         unregister_netdevice_many(&unreg_list);
1250         list_del(&unreg_list);
1251 }
1252
1253 static u32 ieee80211_idle_off(struct ieee80211_local *local,
1254                               const char *reason)
1255 {
1256         if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
1257                 return 0;
1258
1259 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1260         wiphy_debug(local->hw.wiphy, "device no longer idle - %s\n", reason);
1261 #endif
1262
1263         local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
1264         return IEEE80211_CONF_CHANGE_IDLE;
1265 }
1266
1267 static u32 ieee80211_idle_on(struct ieee80211_local *local)
1268 {
1269         if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
1270                 return 0;
1271
1272 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1273         wiphy_debug(local->hw.wiphy, "device now idle\n");
1274 #endif
1275
1276         drv_flush(local, false);
1277
1278         local->hw.conf.flags |= IEEE80211_CONF_IDLE;
1279         return IEEE80211_CONF_CHANGE_IDLE;
1280 }
1281
1282 u32 __ieee80211_recalc_idle(struct ieee80211_local *local)
1283 {
1284         struct ieee80211_sub_if_data *sdata;
1285         int count = 0;
1286         bool working = false, scanning = false, hw_roc = false;
1287         struct ieee80211_work *wk;
1288         unsigned int led_trig_start = 0, led_trig_stop = 0;
1289
1290 #ifdef CONFIG_PROVE_LOCKING
1291         WARN_ON(debug_locks && !lockdep_rtnl_is_held() &&
1292                 !lockdep_is_held(&local->iflist_mtx));
1293 #endif
1294         lockdep_assert_held(&local->mtx);
1295
1296         list_for_each_entry(sdata, &local->interfaces, list) {
1297                 if (!ieee80211_sdata_running(sdata)) {
1298                         sdata->vif.bss_conf.idle = true;
1299                         continue;
1300                 }
1301
1302                 sdata->old_idle = sdata->vif.bss_conf.idle;
1303
1304                 /* do not count disabled managed interfaces */
1305                 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1306                     !sdata->u.mgd.associated) {
1307                         sdata->vif.bss_conf.idle = true;
1308                         continue;
1309                 }
1310                 /* do not count unused IBSS interfaces */
1311                 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
1312                     !sdata->u.ibss.ssid_len) {
1313                         sdata->vif.bss_conf.idle = true;
1314                         continue;
1315                 }
1316                 /* count everything else */
1317                 count++;
1318         }
1319
1320         list_for_each_entry(wk, &local->work_list, list) {
1321                 working = true;
1322                 wk->sdata->vif.bss_conf.idle = false;
1323         }
1324
1325         if (local->scan_sdata) {
1326                 scanning = true;
1327                 local->scan_sdata->vif.bss_conf.idle = false;
1328         }
1329
1330         if (local->hw_roc_channel)
1331                 hw_roc = true;
1332
1333         list_for_each_entry(sdata, &local->interfaces, list) {
1334                 if (sdata->old_idle == sdata->vif.bss_conf.idle)
1335                         continue;
1336                 if (!ieee80211_sdata_running(sdata))
1337                         continue;
1338                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_IDLE);
1339         }
1340
1341         if (working || scanning || hw_roc)
1342                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
1343         else
1344                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
1345
1346         if (count)
1347                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
1348         else
1349                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
1350
1351         ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
1352
1353         if (hw_roc)
1354                 return ieee80211_idle_off(local, "hw remain-on-channel");
1355         if (working)
1356                 return ieee80211_idle_off(local, "working");
1357         if (scanning)
1358                 return ieee80211_idle_off(local, "scanning");
1359         if (!count)
1360                 return ieee80211_idle_on(local);
1361         else
1362                 return ieee80211_idle_off(local, "in use");
1363
1364         return 0;
1365 }
1366
1367 void ieee80211_recalc_idle(struct ieee80211_local *local)
1368 {
1369         u32 chg;
1370
1371         mutex_lock(&local->iflist_mtx);
1372         chg = __ieee80211_recalc_idle(local);
1373         mutex_unlock(&local->iflist_mtx);
1374         if (chg)
1375                 ieee80211_hw_config(local, chg);
1376 }
1377
1378 static int netdev_notify(struct notifier_block *nb,
1379                          unsigned long state,
1380                          void *ndev)
1381 {
1382         struct net_device *dev = ndev;
1383         struct ieee80211_sub_if_data *sdata;
1384
1385         if (state != NETDEV_CHANGENAME)
1386                 return 0;
1387
1388         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1389                 return 0;
1390
1391         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1392                 return 0;
1393
1394         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1395
1396         memcpy(sdata->name, dev->name, IFNAMSIZ);
1397
1398         ieee80211_debugfs_rename_netdev(sdata);
1399         return 0;
1400 }
1401
1402 static struct notifier_block mac80211_netdev_notifier = {
1403         .notifier_call = netdev_notify,
1404 };
1405
1406 int ieee80211_iface_init(void)
1407 {
1408         return register_netdevice_notifier(&mac80211_netdev_notifier);
1409 }
1410
1411 void ieee80211_iface_exit(void)
1412 {
1413         unregister_netdevice_notifier(&mac80211_netdev_notifier);
1414 }