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, true);
 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_pre_move_state(sta, IEEE80211_STA_AUTH);
 322                 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
 323                 sta_info_pre_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         else if (sdata->vif.type == NL80211_IFTYPE_STATION)
 648                 ieee80211_mgd_teardown(sdata);
 649
 650         flushed = sta_info_flush(local, sdata);
 651         WARN_ON(flushed);
 652 }
 653
 654 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
 655                                          struct sk_buff *skb)
 656 {
 657         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
 658 }
 659
 660 static const struct net_device_ops ieee80211_dataif_ops = {
 661         .ndo_open               = ieee80211_open,
 662         .ndo_stop               = ieee80211_stop,
 663         .ndo_uninit             = ieee80211_teardown_sdata,
 664         .ndo_start_xmit         = ieee80211_subif_start_xmit,
 665         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
 666         .ndo_change_mtu         = ieee80211_change_mtu,
 667         .ndo_set_mac_address    = ieee80211_change_mac,
 668         .ndo_select_queue       = ieee80211_netdev_select_queue,
 669 };
 670
 671 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
 672                                           struct sk_buff *skb)
 673 {
 674         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 675         struct ieee80211_local *local = sdata->local;
 676         struct ieee80211_hdr *hdr;
 677         struct ieee80211_radiotap_header *rtap = (void *)skb->data;
 678
 679         if (local->hw.queues < 4)
 680                 return 0;
 681
 682         if (skb->len < 4 ||
 683             skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
 684                 return 0; /* doesn't matter, frame will be dropped */
 685
 686         hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
 687
 688         return ieee80211_select_queue_80211(local, skb, hdr);
 689 }
 690
 691 static const struct net_device_ops ieee80211_monitorif_ops = {
 692         .ndo_open               = ieee80211_open,
 693         .ndo_stop               = ieee80211_stop,
 694         .ndo_uninit             = ieee80211_teardown_sdata,
 695         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
 696         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
 697         .ndo_change_mtu         = ieee80211_change_mtu,
 698         .ndo_set_mac_address    = eth_mac_addr,
 699         .ndo_select_queue       = ieee80211_monitor_select_queue,
 700 };
 701
 702 static void ieee80211_if_setup(struct net_device *dev)
 703 {
 704         ether_setup(dev);
 705         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
 706         dev->netdev_ops = &ieee80211_dataif_ops;
 707         dev->destructor = free_netdev;
 708 }
 709
 710 static void ieee80211_iface_work(struct work_struct *work)
 711 {
 712         struct ieee80211_sub_if_data *sdata =
 713                 container_of(work, struct ieee80211_sub_if_data, work);
 714         struct ieee80211_local *local = sdata->local;
 715         struct sk_buff *skb;
 716         struct sta_info *sta;
 717         struct ieee80211_ra_tid *ra_tid;
 718
 719         if (!ieee80211_sdata_running(sdata))
 720                 return;
 721
 722         if (local->scanning)
 723                 return;
 724
 725         /*
 726          * ieee80211_queue_work() should have picked up most cases,
 727          * here we'll pick the rest.
 728          */
 729         if (WARN(local->suspended,
 730                  "interface work scheduled while going to suspend\n"))
 731                 return;
 732
 733         /* first process frames */
 734         while ((skb = skb_dequeue(&sdata->skb_queue))) {
 735                 struct ieee80211_mgmt *mgmt = (void *)skb->data;
 736
 737                 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
 738                         ra_tid = (void *)&skb->cb;
 739                         ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
 740                                                  ra_tid->tid);
 741                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
 742                         ra_tid = (void *)&skb->cb;
 743                         ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
 744                                                 ra_tid->tid);
 745                 } else if (ieee80211_is_action(mgmt->frame_control) &&
 746                            mgmt->u.action.category == WLAN_CATEGORY_BACK) {
 747                         int len = skb->len;
 748
 749                         mutex_lock(&local->sta_mtx);
 750                         sta = sta_info_get_bss(sdata, mgmt->sa);
 751                         if (sta) {
 752                                 switch (mgmt->u.action.u.addba_req.action_code) {
 753                                 case WLAN_ACTION_ADDBA_REQ:
 754                                         ieee80211_process_addba_request(
 755                                                         local, sta, mgmt, len);
 756                                         break;
 757                                 case WLAN_ACTION_ADDBA_RESP:
 758                                         ieee80211_process_addba_resp(local, sta,
 759                                                                      mgmt, len);
 760                                         break;
 761                                 case WLAN_ACTION_DELBA:
 762                                         ieee80211_process_delba(sdata, sta,
 763                                                                 mgmt, len);
 764                                         break;
 765                                 default:
 766                                         WARN_ON(1);
 767                                         break;
 768                                 }
 769                         }
 770                         mutex_unlock(&local->sta_mtx);
 771                 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
 772                         struct ieee80211_hdr *hdr = (void *)mgmt;
 773                         /*
 774                          * So the frame isn't mgmt, but frame_control
 775                          * is at the right place anyway, of course, so
 776                          * the if statement is correct.
 777                          *
 778                          * Warn if we have other data frame types here,
 779                          * they must not get here.
 780                          */
 781                         WARN_ON(hdr->frame_control &
 782                                         cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
 783                         WARN_ON(!(hdr->seq_ctrl &
 784                                         cpu_to_le16(IEEE80211_SCTL_FRAG)));
 785                         /*
 786                          * This was a fragment of a frame, received while
 787                          * a block-ack session was active. That cannot be
 788                          * right, so terminate the session.
 789                          */
 790                         mutex_lock(&local->sta_mtx);
 791                         sta = sta_info_get_bss(sdata, mgmt->sa);
 792                         if (sta) {
 793                                 u16 tid = *ieee80211_get_qos_ctl(hdr) &
 794                                                 IEEE80211_QOS_CTL_TID_MASK;
 795
 796                                 __ieee80211_stop_rx_ba_session(
 797                                         sta, tid, WLAN_BACK_RECIPIENT,
 798                                         WLAN_REASON_QSTA_REQUIRE_SETUP,
 799                                         true);
 800                         }
 801                         mutex_unlock(&local->sta_mtx);
 802                 } else switch (sdata->vif.type) {
 803                 case NL80211_IFTYPE_STATION:
 804                         ieee80211_sta_rx_queued_mgmt(sdata, skb);
 805                         break;
 806                 case NL80211_IFTYPE_ADHOC:
 807                         ieee80211_ibss_rx_queued_mgmt(sdata, skb);
 808                         break;
 809                 case NL80211_IFTYPE_MESH_POINT:
 810                         if (!ieee80211_vif_is_mesh(&sdata->vif))
 811                                 break;
 812                         ieee80211_mesh_rx_queued_mgmt(sdata, skb);
 813                         break;
 814                 default:
 815                         WARN(1, "frame for unexpected interface type");
 816                         break;
 817                 }
 818
 819                 kfree_skb(skb);
 820         }
 821
 822         /* then other type-dependent work */
 823         switch (sdata->vif.type) {
 824         case NL80211_IFTYPE_STATION:
 825                 ieee80211_sta_work(sdata);
 826                 break;
 827         case NL80211_IFTYPE_ADHOC:
 828                 ieee80211_ibss_work(sdata);
 829                 break;
 830         case NL80211_IFTYPE_MESH_POINT:
 831                 if (!ieee80211_vif_is_mesh(&sdata->vif))
 832                         break;
 833                 ieee80211_mesh_work(sdata);
 834                 break;
 835         default:
 836                 break;
 837         }
 838 }
 839
 840
 841 /*
 842  * Helper function to initialise an interface to a specific type.
 843  */
 844 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
 845                                   enum nl80211_iftype type)
 846 {
 847         /* clear type-dependent union */
 848         memset(&sdata->u, 0, sizeof(sdata->u));
 849
 850         /* and set some type-dependent values */
 851         sdata->vif.type = type;
 852         sdata->vif.p2p = false;
 853         sdata->dev->netdev_ops = &ieee80211_dataif_ops;
 854         sdata->wdev.iftype = type;
 855
 856         sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
 857         sdata->control_port_no_encrypt = false;
 858
 859         sdata->noack_map = 0;
 860
 861         /* only monitor differs */
 862         sdata->dev->type = ARPHRD_ETHER;
 863
 864         skb_queue_head_init(&sdata->skb_queue);
 865         INIT_WORK(&sdata->work, ieee80211_iface_work);
 866
 867         switch (type) {
 868         case NL80211_IFTYPE_P2P_GO:
 869                 type = NL80211_IFTYPE_AP;
 870                 sdata->vif.type = type;
 871                 sdata->vif.p2p = true;
 872                 /* fall through */
 873         case NL80211_IFTYPE_AP:
 874                 skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
 875                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
 876                 break;
 877         case NL80211_IFTYPE_P2P_CLIENT:
 878                 type = NL80211_IFTYPE_STATION;
 879                 sdata->vif.type = type;
 880                 sdata->vif.p2p = true;
 881                 /* fall through */
 882         case NL80211_IFTYPE_STATION:
 883                 ieee80211_sta_setup_sdata(sdata);
 884                 break;
 885         case NL80211_IFTYPE_ADHOC:
 886                 ieee80211_ibss_setup_sdata(sdata);
 887                 break;
 888         case NL80211_IFTYPE_MESH_POINT:
 889                 if (ieee80211_vif_is_mesh(&sdata->vif))
 890                         ieee80211_mesh_init_sdata(sdata);
 891                 break;
 892         case NL80211_IFTYPE_MONITOR:
 893                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
 894                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
 895                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
 896                                       MONITOR_FLAG_OTHER_BSS;
 897                 break;
 898         case NL80211_IFTYPE_WDS:
 899         case NL80211_IFTYPE_AP_VLAN:
 900                 break;
 901         case NL80211_IFTYPE_UNSPECIFIED:
 902         case NUM_NL80211_IFTYPES:
 903                 BUG();
 904                 break;
 905         }
 906
 907         ieee80211_debugfs_add_netdev(sdata);
 908 }
 909
 910 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
 911                                            enum nl80211_iftype type)
 912 {
 913         struct ieee80211_local *local = sdata->local;
 914         int ret, err;
 915         enum nl80211_iftype internal_type = type;
 916         bool p2p = false;
 917
 918         ASSERT_RTNL();
 919
 920         if (!local->ops->change_interface)
 921                 return -EBUSY;
 922
 923         switch (sdata->vif.type) {
 924         case NL80211_IFTYPE_AP:
 925         case NL80211_IFTYPE_STATION:
 926         case NL80211_IFTYPE_ADHOC:
 927                 /*
 928                  * Could maybe also all others here?
 929                  * Just not sure how that interacts
 930                  * with the RX/config path e.g. for
 931                  * mesh.
 932                  */
 933                 break;
 934         default:
 935                 return -EBUSY;
 936         }
 937
 938         switch (type) {
 939         case NL80211_IFTYPE_AP:
 940         case NL80211_IFTYPE_STATION:
 941         case NL80211_IFTYPE_ADHOC:
 942                 /*
 943                  * Could probably support everything
 944                  * but WDS here (WDS do_open can fail
 945                  * under memory pressure, which this
 946                  * code isn't prepared to handle).
 947                  */
 948                 break;
 949         case NL80211_IFTYPE_P2P_CLIENT:
 950                 p2p = true;
 951                 internal_type = NL80211_IFTYPE_STATION;
 952                 break;
 953         case NL80211_IFTYPE_P2P_GO:
 954                 p2p = true;
 955                 internal_type = NL80211_IFTYPE_AP;
 956                 break;
 957         default:
 958                 return -EBUSY;
 959         }
 960
 961         ret = ieee80211_check_concurrent_iface(sdata, internal_type);
 962         if (ret)
 963                 return ret;
 964
 965         ieee80211_do_stop(sdata, false);
 966
 967         ieee80211_teardown_sdata(sdata->dev);
 968
 969         ret = drv_change_interface(local, sdata, internal_type, p2p);
 970         if (ret)
 971                 type = sdata->vif.type;
 972
 973         ieee80211_setup_sdata(sdata, type);
 974
 975         err = ieee80211_do_open(sdata->dev, false);
 976         WARN(err, "type change: do_open returned %d", err);
 977
 978         return ret;
 979 }
 980
 981 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
 982                              enum nl80211_iftype type)
 983 {
 984         int ret;
 985
 986         ASSERT_RTNL();
 987
 988         if (type == ieee80211_vif_type_p2p(&sdata->vif))
 989                 return 0;
 990
 991         /* Setting ad-hoc mode on non-IBSS channel is not supported. */
 992         if (sdata->local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS &&
 993             type == NL80211_IFTYPE_ADHOC)
 994                 return -EOPNOTSUPP;
 995
 996         if (ieee80211_sdata_running(sdata)) {
 997                 ret = ieee80211_runtime_change_iftype(sdata, type);
 998                 if (ret)
 999                         return ret;
1000         } else {
1001                 /* Purge and reset type-dependent state. */
1002                 ieee80211_teardown_sdata(sdata->dev);
1003                 ieee80211_setup_sdata(sdata, type);
1004         }
1005
1006         /* reset some values that shouldn't be kept across type changes */
1007         sdata->vif.bss_conf.basic_rates =
1008                 ieee80211_mandatory_rates(sdata->local,
1009                         sdata->local->hw.conf.channel->band);
1010         sdata->drop_unencrypted = 0;
1011         if (type == NL80211_IFTYPE_STATION)
1012                 sdata->u.mgd.use_4addr = false;
1013
1014         return 0;
1015 }
1016
1017 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1018                                        struct net_device *dev,
1019                                        enum nl80211_iftype type)
1020 {
1021         struct ieee80211_sub_if_data *sdata;
1022         u64 mask, start, addr, val, inc;
1023         u8 *m;
1024         u8 tmp_addr[ETH_ALEN];
1025         int i;
1026
1027         /* default ... something at least */
1028         memcpy(dev->perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1029
1030         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1031             local->hw.wiphy->n_addresses <= 1)
1032                 return;
1033
1034
1035         mutex_lock(&local->iflist_mtx);
1036
1037         switch (type) {
1038         case NL80211_IFTYPE_MONITOR:
1039                 /* doesn't matter */
1040                 break;
1041         case NL80211_IFTYPE_WDS:
1042         case NL80211_IFTYPE_AP_VLAN:
1043                 /* match up with an AP interface */
1044                 list_for_each_entry(sdata, &local->interfaces, list) {
1045                         if (sdata->vif.type != NL80211_IFTYPE_AP)
1046                                 continue;
1047                         memcpy(dev->perm_addr, sdata->vif.addr, ETH_ALEN);
1048                         break;
1049                 }
1050                 /* keep default if no AP interface present */
1051                 break;
1052         default:
1053                 /* assign a new address if possible -- try n_addresses first */
1054                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1055                         bool used = false;
1056
1057                         list_for_each_entry(sdata, &local->interfaces, list) {
1058                                 if (memcmp(local->hw.wiphy->addresses[i].addr,
1059                                            sdata->vif.addr, ETH_ALEN) == 0) {
1060                                         used = true;
1061                                         break;
1062                                 }
1063                         }
1064
1065                         if (!used) {
1066                                 memcpy(dev->perm_addr,
1067                                        local->hw.wiphy->addresses[i].addr,
1068                                        ETH_ALEN);
1069                                 break;
1070                         }
1071                 }
1072
1073                 /* try mask if available */
1074                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1075                         break;
1076
1077                 m = local->hw.wiphy->addr_mask;
1078                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1079                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1080                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1081
1082                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1083                         /* not a contiguous mask ... not handled now! */
1084                         printk(KERN_DEBUG "not contiguous\n");
1085                         break;
1086                 }
1087
1088                 m = local->hw.wiphy->perm_addr;
1089                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1090                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1091                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1092
1093                 inc = 1ULL<<__ffs64(mask);
1094                 val = (start & mask);
1095                 addr = (start & ~mask) | (val & mask);
1096                 do {
1097                         bool used = false;
1098
1099                         tmp_addr[5] = addr >> 0*8;
1100                         tmp_addr[4] = addr >> 1*8;
1101                         tmp_addr[3] = addr >> 2*8;
1102                         tmp_addr[2] = addr >> 3*8;
1103                         tmp_addr[1] = addr >> 4*8;
1104                         tmp_addr[0] = addr >> 5*8;
1105
1106                         val += inc;
1107
1108                         list_for_each_entry(sdata, &local->interfaces, list) {
1109                                 if (memcmp(tmp_addr, sdata->vif.addr,
1110                                                         ETH_ALEN) == 0) {
1111                                         used = true;
1112                                         break;
1113                                 }
1114                         }
1115
1116                         if (!used) {
1117                                 memcpy(dev->perm_addr, tmp_addr, ETH_ALEN);
1118                                 break;
1119                         }
1120                         addr = (start & ~mask) | (val & mask);
1121                 } while (addr != start);
1122
1123                 break;
1124         }
1125
1126         mutex_unlock(&local->iflist_mtx);
1127 }
1128
1129 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1130                      struct net_device **new_dev, enum nl80211_iftype type,
1131                      struct vif_params *params)
1132 {
1133         struct net_device *ndev;
1134         struct ieee80211_sub_if_data *sdata = NULL;
1135         int ret, i;
1136
1137         ASSERT_RTNL();
1138
1139         ndev = alloc_netdev_mqs(sizeof(*sdata) + local->hw.vif_data_size,
1140                                 name, ieee80211_if_setup, local->hw.queues, 1);
1141         if (!ndev)
1142                 return -ENOMEM;
1143         dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1144
1145         ndev->needed_headroom = local->tx_headroom +
1146                                 4*6 /* four MAC addresses */
1147                                 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1148                                 + 6 /* mesh */
1149                                 + 8 /* rfc1042/bridge tunnel */
1150                                 - ETH_HLEN /* ethernet hard_header_len */
1151                                 + IEEE80211_ENCRYPT_HEADROOM;
1152         ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1153
1154         ret = dev_alloc_name(ndev, ndev->name);
1155         if (ret < 0)
1156                 goto fail;
1157
1158         ieee80211_assign_perm_addr(local, ndev, type);
1159         memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1160         SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1161
1162         /* don't use IEEE80211_DEV_TO_SUB_IF because it checks too much */
1163         sdata = netdev_priv(ndev);
1164         ndev->ieee80211_ptr = &sdata->wdev;
1165         memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1166         memcpy(sdata->name, ndev->name, IFNAMSIZ);
1167
1168         /* initialise type-independent data */
1169         sdata->wdev.wiphy = local->hw.wiphy;
1170         sdata->local = local;
1171         sdata->dev = ndev;
1172 #ifdef CONFIG_INET
1173         sdata->arp_filter_state = true;
1174 #endif
1175
1176         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1177                 skb_queue_head_init(&sdata->fragments[i].skb_list);
1178
1179         INIT_LIST_HEAD(&sdata->key_list);
1180
1181         for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1182                 struct ieee80211_supported_band *sband;
1183                 sband = local->hw.wiphy->bands[i];
1184                 sdata->rc_rateidx_mask[i] =
1185                         sband ? (1 << sband->n_bitrates) - 1 : 0;
1186                 if (sband)
1187                         memcpy(sdata->rc_rateidx_mcs_mask[i],
1188                                sband->ht_cap.mcs.rx_mask,
1189                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1190                 else
1191                         memset(sdata->rc_rateidx_mcs_mask[i], 0,
1192                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1193         }
1194
1195         /* setup type-dependent data */
1196         ieee80211_setup_sdata(sdata, type);
1197
1198         if (params) {
1199                 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1200                 if (type == NL80211_IFTYPE_STATION)
1201                         sdata->u.mgd.use_4addr = params->use_4addr;
1202         }
1203
1204         ret = register_netdevice(ndev);
1205         if (ret)
1206                 goto fail;
1207
1208         mutex_lock(&local->iflist_mtx);
1209         list_add_tail_rcu(&sdata->list, &local->interfaces);
1210         mutex_unlock(&local->iflist_mtx);
1211
1212         if (new_dev)
1213                 *new_dev = ndev;
1214
1215         return 0;
1216
1217  fail:
1218         free_netdev(ndev);
1219         return ret;
1220 }
1221
1222 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1223 {
1224         ASSERT_RTNL();
1225
1226         mutex_lock(&sdata->local->iflist_mtx);
1227         list_del_rcu(&sdata->list);
1228         mutex_unlock(&sdata->local->iflist_mtx);
1229
1230         if (ieee80211_vif_is_mesh(&sdata->vif))
1231                 mesh_path_flush_by_iface(sdata);
1232
1233         synchronize_rcu();
1234         unregister_netdevice(sdata->dev);
1235 }
1236
1237 /*
1238  * Remove all interfaces, may only be called at hardware unregistration
1239  * time because it doesn't do RCU-safe list removals.
1240  */
1241 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1242 {
1243         struct ieee80211_sub_if_data *sdata, *tmp;
1244         LIST_HEAD(unreg_list);
1245
1246         ASSERT_RTNL();
1247
1248         mutex_lock(&local->iflist_mtx);
1249         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1250                 list_del(&sdata->list);
1251
1252                 if (ieee80211_vif_is_mesh(&sdata->vif))
1253                         mesh_path_flush_by_iface(sdata);
1254
1255                 unregister_netdevice_queue(sdata->dev, &unreg_list);
1256         }
1257         mutex_unlock(&local->iflist_mtx);
1258         unregister_netdevice_many(&unreg_list);
1259         list_del(&unreg_list);
1260 }
1261
1262 static u32 ieee80211_idle_off(struct ieee80211_local *local,
1263                               const char *reason)
1264 {
1265         if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
1266                 return 0;
1267
1268 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1269         wiphy_debug(local->hw.wiphy, "device no longer idle - %s\n", reason);
1270 #endif
1271
1272         local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
1273         return IEEE80211_CONF_CHANGE_IDLE;
1274 }
1275
1276 static u32 ieee80211_idle_on(struct ieee80211_local *local)
1277 {
1278         if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
1279                 return 0;
1280
1281 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1282         wiphy_debug(local->hw.wiphy, "device now idle\n");
1283 #endif
1284
1285         drv_flush(local, false);
1286
1287         local->hw.conf.flags |= IEEE80211_CONF_IDLE;
1288         return IEEE80211_CONF_CHANGE_IDLE;
1289 }
1290
1291 u32 __ieee80211_recalc_idle(struct ieee80211_local *local)
1292 {
1293         struct ieee80211_sub_if_data *sdata;
1294         int count = 0;
1295         bool working = false, scanning = false, hw_roc = false;
1296         struct ieee80211_work *wk;
1297         unsigned int led_trig_start = 0, led_trig_stop = 0;
1298
1299 #ifdef CONFIG_PROVE_LOCKING
1300         WARN_ON(debug_locks && !lockdep_rtnl_is_held() &&
1301                 !lockdep_is_held(&local->iflist_mtx));
1302 #endif
1303         lockdep_assert_held(&local->mtx);
1304
1305         list_for_each_entry(sdata, &local->interfaces, list) {
1306                 if (!ieee80211_sdata_running(sdata)) {
1307                         sdata->vif.bss_conf.idle = true;
1308                         continue;
1309                 }
1310
1311                 sdata->old_idle = sdata->vif.bss_conf.idle;
1312
1313                 /* do not count disabled managed interfaces */
1314                 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1315                     !sdata->u.mgd.associated &&
1316                     !sdata->u.mgd.auth_data &&
1317                     !sdata->u.mgd.assoc_data) {
1318                         sdata->vif.bss_conf.idle = true;
1319                         continue;
1320                 }
1321                 /* do not count unused IBSS interfaces */
1322                 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
1323                     !sdata->u.ibss.ssid_len) {
1324                         sdata->vif.bss_conf.idle = true;
1325                         continue;
1326                 }
1327                 /* count everything else */
1328                 sdata->vif.bss_conf.idle = false;
1329                 count++;
1330         }
1331
1332         list_for_each_entry(wk, &local->work_list, list) {
1333                 working = true;
1334                 wk->sdata->vif.bss_conf.idle = false;
1335         }
1336
1337         if (local->scan_sdata &&
1338             !(local->hw.flags & IEEE80211_HW_SCAN_WHILE_IDLE)) {
1339                 scanning = true;
1340                 local->scan_sdata->vif.bss_conf.idle = false;
1341         }
1342
1343         if (local->hw_roc_channel)
1344                 hw_roc = true;
1345
1346         list_for_each_entry(sdata, &local->interfaces, list) {
1347                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1348                     sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1349                         continue;
1350                 if (sdata->old_idle == sdata->vif.bss_conf.idle)
1351                         continue;
1352                 if (!ieee80211_sdata_running(sdata))
1353                         continue;
1354                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_IDLE);
1355         }
1356
1357         if (working || scanning || hw_roc)
1358                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
1359         else
1360                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
1361
1362         if (count)
1363                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
1364         else
1365                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
1366
1367         ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
1368
1369         if (hw_roc)
1370                 return ieee80211_idle_off(local, "hw remain-on-channel");
1371         if (working)
1372                 return ieee80211_idle_off(local, "working");
1373         if (scanning)
1374                 return ieee80211_idle_off(local, "scanning");
1375         if (!count)
1376                 return ieee80211_idle_on(local);
1377         else
1378                 return ieee80211_idle_off(local, "in use");
1379
1380         return 0;
1381 }
1382
1383 void ieee80211_recalc_idle(struct ieee80211_local *local)
1384 {
1385         u32 chg;
1386
1387         mutex_lock(&local->iflist_mtx);
1388         chg = __ieee80211_recalc_idle(local);
1389         mutex_unlock(&local->iflist_mtx);
1390         if (chg)
1391                 ieee80211_hw_config(local, chg);
1392 }
1393
1394 static int netdev_notify(struct notifier_block *nb,
1395                          unsigned long state,
1396                          void *ndev)
1397 {
1398         struct net_device *dev = ndev;
1399         struct ieee80211_sub_if_data *sdata;
1400
1401         if (state != NETDEV_CHANGENAME)
1402                 return 0;
1403
1404         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1405                 return 0;
1406
1407         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1408                 return 0;
1409
1410         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1411
1412         memcpy(sdata->name, dev->name, IFNAMSIZ);
1413
1414         ieee80211_debugfs_rename_netdev(sdata);
1415         return 0;
1416 }
1417
1418 static struct notifier_block mac80211_netdev_notifier = {
1419         .notifier_call = netdev_notify,
1420 };
1421
1422 int ieee80211_iface_init(void)
1423 {
1424         return register_netdevice_notifier(&mac80211_netdev_notifier);
1425 }
1426
1427 void ieee80211_iface_exit(void)
1428 {
1429         unregister_netdevice_notifier(&mac80211_netdev_notifier);
1430 }