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                 /* no atomic bitop required since STA is not live yet */
 322                 set_sta_flag(sta, WLAN_STA_AUTHORIZED);
 323
 324                 res = sta_info_insert(sta);
 325                 if (res) {
 326                         /* STA has been freed */
 327                         goto err_del_interface;
 328                 }
 329
 330                 rate_control_rate_init(sta);
 331         }
 332
 333         /*
 334          * set_multicast_list will be invoked by the networking core
 335          * which will check whether any increments here were done in
 336          * error and sync them down to the hardware as filter flags.
 337          */
 338         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 339                 atomic_inc(&local->iff_allmultis);
 340
 341         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 342                 atomic_inc(&local->iff_promiscs);
 343
 344         mutex_lock(&local->mtx);
 345         hw_reconf_flags |= __ieee80211_recalc_idle(local);
 346         mutex_unlock(&local->mtx);
 347
 348         if (coming_up)
 349                 local->open_count++;
 350
 351         if (hw_reconf_flags)
 352                 ieee80211_hw_config(local, hw_reconf_flags);
 353
 354         ieee80211_recalc_ps(local, -1);
 355
 356         netif_tx_start_all_queues(dev);
 357
 358         return 0;
 359  err_del_interface:
 360         drv_remove_interface(local, sdata);
 361  err_stop:
 362         if (!local->open_count)
 363                 drv_stop(local);
 364  err_del_bss:
 365         sdata->bss = NULL;
 366         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
 367                 list_del(&sdata->u.vlan.list);
 368         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 369         return res;
 370 }
 371
 372 static int ieee80211_open(struct net_device *dev)
 373 {
 374         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 375         int err;
 376
 377         /* fail early if user set an invalid address */
 378         if (!is_valid_ether_addr(dev->dev_addr))
 379                 return -EADDRNOTAVAIL;
 380
 381         err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
 382         if (err)
 383                 return err;
 384
 385         return ieee80211_do_open(dev, true);
 386 }
 387
 388 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
 389                               bool going_down)
 390 {
 391         struct ieee80211_local *local = sdata->local;
 392         unsigned long flags;
 393         struct sk_buff *skb, *tmp;
 394         u32 hw_reconf_flags = 0;
 395         int i;
 396         enum nl80211_channel_type orig_ct;
 397
 398         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 399
 400         if (local->scan_sdata == sdata)
 401                 ieee80211_scan_cancel(local);
 402
 403         /*
 404          * Stop TX on this interface first.
 405          */
 406         netif_tx_stop_all_queues(sdata->dev);
 407
 408         /*
 409          * Purge work for this interface.
 410          */
 411         ieee80211_work_purge(sdata);
 412
 413         /*
 414          * Remove all stations associated with this interface.
 415          *
 416          * This must be done before calling ops->remove_interface()
 417          * because otherwise we can later invoke ops->sta_notify()
 418          * whenever the STAs are removed, and that invalidates driver
 419          * assumptions about always getting a vif pointer that is valid
 420          * (because if we remove a STA after ops->remove_interface()
 421          * the driver will have removed the vif info already!)
 422          *
 423          * This is relevant only in AP, WDS and mesh modes, since in
 424          * all other modes we've already removed all stations when
 425          * disconnecting etc.
 426          */
 427         sta_info_flush(local, sdata);
 428
 429         /*
 430          * Don't count this interface for promisc/allmulti while it
 431          * is down. dev_mc_unsync() will invoke set_multicast_list
 432          * on the master interface which will sync these down to the
 433          * hardware as filter flags.
 434          */
 435         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 436                 atomic_dec(&local->iff_allmultis);
 437
 438         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 439                 atomic_dec(&local->iff_promiscs);
 440
 441         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 442                 local->fif_pspoll--;
 443                 local->fif_probe_req--;
 444         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 445                 local->fif_probe_req--;
 446         }
 447
 448         netif_addr_lock_bh(sdata->dev);
 449         spin_lock_bh(&local->filter_lock);
 450         __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
 451                          sdata->dev->addr_len);
 452         spin_unlock_bh(&local->filter_lock);
 453         netif_addr_unlock_bh(sdata->dev);
 454
 455         ieee80211_configure_filter(local);
 456
 457         del_timer_sync(&local->dynamic_ps_timer);
 458         cancel_work_sync(&local->dynamic_ps_enable_work);
 459
 460         /* APs need special treatment */
 461         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 462                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
 463                 struct beacon_data *old_beacon =
 464                         rtnl_dereference(sdata->u.ap.beacon);
 465                 struct sk_buff *old_probe_resp =
 466                         rtnl_dereference(sdata->u.ap.probe_resp);
 467
 468                 /* sdata_running will return false, so this will disable */
 469                 ieee80211_bss_info_change_notify(sdata,
 470                                                  BSS_CHANGED_BEACON_ENABLED);
 471
 472                 /* remove beacon and probe response */
 473                 RCU_INIT_POINTER(sdata->u.ap.beacon, NULL);
 474                 RCU_INIT_POINTER(sdata->u.ap.probe_resp, NULL);
 475                 synchronize_rcu();
 476                 kfree(old_beacon);
 477                 kfree_skb(old_probe_resp);
 478
 479                 /* down all dependent devices, that is VLANs */
 480                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
 481                                          u.vlan.list)
 482                         dev_close(vlan->dev);
 483                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
 484
 485                 /* free all potentially still buffered bcast frames */
 486                 local->total_ps_buffered -= skb_queue_len(&sdata->u.ap.ps_bc_buf);
 487                 skb_queue_purge(&sdata->u.ap.ps_bc_buf);
 488         }
 489
 490         if (going_down)
 491                 local->open_count--;
 492
 493         switch (sdata->vif.type) {
 494         case NL80211_IFTYPE_AP_VLAN:
 495                 list_del(&sdata->u.vlan.list);
 496                 /* no need to tell driver */
 497                 break;
 498         case NL80211_IFTYPE_MONITOR:
 499                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 500                         local->cooked_mntrs--;
 501                         break;
 502                 }
 503
 504                 local->monitors--;
 505                 if (local->monitors == 0) {
 506                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
 507                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 508                 }
 509
 510                 ieee80211_adjust_monitor_flags(sdata, -1);
 511                 ieee80211_configure_filter(local);
 512                 break;
 513         default:
 514                 flush_work(&sdata->work);
 515                 /*
 516                  * When we get here, the interface is marked down.
 517                  * Call synchronize_rcu() to wait for the RX path
 518                  * should it be using the interface and enqueuing
 519                  * frames at this very time on another CPU.
 520                  */
 521                 synchronize_rcu();
 522                 skb_queue_purge(&sdata->skb_queue);
 523
 524                 /*
 525                  * Disable beaconing here for mesh only, AP and IBSS
 526                  * are already taken care of.
 527                  */
 528                 if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
 529                         ieee80211_bss_info_change_notify(sdata,
 530                                 BSS_CHANGED_BEACON_ENABLED);
 531
 532                 /*
 533                  * Free all remaining keys, there shouldn't be any,
 534                  * except maybe group keys in AP more or WDS?
 535                  */
 536                 ieee80211_free_keys(sdata);
 537
 538                 if (going_down)
 539                         drv_remove_interface(local, sdata);
 540         }
 541
 542         sdata->bss = NULL;
 543
 544         mutex_lock(&local->mtx);
 545         hw_reconf_flags |= __ieee80211_recalc_idle(local);
 546         mutex_unlock(&local->mtx);
 547
 548         ieee80211_recalc_ps(local, -1);
 549
 550         if (local->open_count == 0) {
 551                 if (local->ops->napi_poll)
 552                         napi_disable(&local->napi);
 553                 ieee80211_clear_tx_pending(local);
 554                 ieee80211_stop_device(local);
 555
 556                 /* no reconfiguring after stop! */
 557                 hw_reconf_flags = 0;
 558         }
 559
 560         /* Re-calculate channel-type, in case there are multiple vifs
 561          * on different channel types.
 562          */
 563         orig_ct = local->_oper_channel_type;
 564         ieee80211_set_channel_type(local, NULL, NL80211_CHAN_NO_HT);
 565
 566         /* do after stop to avoid reconfiguring when we stop anyway */
 567         if (hw_reconf_flags || (orig_ct != local->_oper_channel_type))
 568                 ieee80211_hw_config(local, hw_reconf_flags);
 569
 570         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 571         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 572                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
 573                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 574                         if (info->control.vif == &sdata->vif) {
 575                                 __skb_unlink(skb, &local->pending[i]);
 576                                 dev_kfree_skb_irq(skb);
 577                         }
 578                 }
 579         }
 580         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 581 }
 582
 583 static int ieee80211_stop(struct net_device *dev)
 584 {
 585         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 586
 587         ieee80211_do_stop(sdata, true);
 588
 589         return 0;
 590 }
 591
 592 static void ieee80211_set_multicast_list(struct net_device *dev)
 593 {
 594         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 595         struct ieee80211_local *local = sdata->local;
 596         int allmulti, promisc, sdata_allmulti, sdata_promisc;
 597
 598         allmulti = !!(dev->flags & IFF_ALLMULTI);
 599         promisc = !!(dev->flags & IFF_PROMISC);
 600         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
 601         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
 602
 603         if (allmulti != sdata_allmulti) {
 604                 if (dev->flags & IFF_ALLMULTI)
 605                         atomic_inc(&local->iff_allmultis);
 606                 else
 607                         atomic_dec(&local->iff_allmultis);
 608                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
 609         }
 610
 611         if (promisc != sdata_promisc) {
 612                 if (dev->flags & IFF_PROMISC)
 613                         atomic_inc(&local->iff_promiscs);
 614                 else
 615                         atomic_dec(&local->iff_promiscs);
 616                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
 617         }
 618         spin_lock_bh(&local->filter_lock);
 619         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
 620         spin_unlock_bh(&local->filter_lock);
 621         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
 622 }
 623
 624 /*
 625  * Called when the netdev is removed or, by the code below, before
 626  * the interface type changes.
 627  */
 628 static void ieee80211_teardown_sdata(struct net_device *dev)
 629 {
 630         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 631         struct ieee80211_local *local = sdata->local;
 632         int flushed;
 633         int i;
 634
 635         /* free extra data */
 636         ieee80211_free_keys(sdata);
 637
 638         ieee80211_debugfs_remove_netdev(sdata);
 639
 640         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
 641                 __skb_queue_purge(&sdata->fragments[i].skb_list);
 642         sdata->fragment_next = 0;
 643
 644         if (ieee80211_vif_is_mesh(&sdata->vif))
 645                 mesh_rmc_free(sdata);
 646
 647         flushed = sta_info_flush(local, sdata);
 648         WARN_ON(flushed);
 649 }
 650
 651 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
 652                                          struct sk_buff *skb)
 653 {
 654         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
 655 }
 656
 657 static const struct net_device_ops ieee80211_dataif_ops = {
 658         .ndo_open               = ieee80211_open,
 659         .ndo_stop               = ieee80211_stop,
 660         .ndo_uninit             = ieee80211_teardown_sdata,
 661         .ndo_start_xmit         = ieee80211_subif_start_xmit,
 662         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
 663         .ndo_change_mtu         = ieee80211_change_mtu,
 664         .ndo_set_mac_address    = ieee80211_change_mac,
 665         .ndo_select_queue       = ieee80211_netdev_select_queue,
 666 };
 667
 668 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
 669                                           struct sk_buff *skb)
 670 {
 671         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 672         struct ieee80211_local *local = sdata->local;
 673         struct ieee80211_hdr *hdr;
 674         struct ieee80211_radiotap_header *rtap = (void *)skb->data;
 675         u8 *p;
 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         if (!ieee80211_is_data(hdr->frame_control)) {
 687                 skb->priority = 7;
 688                 return ieee802_1d_to_ac[skb->priority];
 689         }
 690         if (!ieee80211_is_data_qos(hdr->frame_control)) {
 691                 skb->priority = 0;
 692                 return ieee802_1d_to_ac[skb->priority];
 693         }
 694
 695         p = ieee80211_get_qos_ctl(hdr);
 696         skb->priority = *p & IEEE80211_QOS_CTL_TAG1D_MASK;
 697
 698         return ieee80211_downgrade_queue(local, skb);
 699 }
 700
 701 static const struct net_device_ops ieee80211_monitorif_ops = {
 702         .ndo_open               = ieee80211_open,
 703         .ndo_stop               = ieee80211_stop,
 704         .ndo_uninit             = ieee80211_teardown_sdata,
 705         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
 706         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
 707         .ndo_change_mtu         = ieee80211_change_mtu,
 708         .ndo_set_mac_address    = eth_mac_addr,
 709         .ndo_select_queue       = ieee80211_monitor_select_queue,
 710 };
 711
 712 static void ieee80211_if_setup(struct net_device *dev)
 713 {
 714         ether_setup(dev);
 715         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
 716         dev->netdev_ops = &ieee80211_dataif_ops;
 717         dev->destructor = free_netdev;
 718 }
 719
 720 static void ieee80211_iface_work(struct work_struct *work)
 721 {
 722         struct ieee80211_sub_if_data *sdata =
 723                 container_of(work, struct ieee80211_sub_if_data, work);
 724         struct ieee80211_local *local = sdata->local;
 725         struct sk_buff *skb;
 726         struct sta_info *sta;
 727         struct ieee80211_ra_tid *ra_tid;
 728
 729         if (!ieee80211_sdata_running(sdata))
 730                 return;
 731
 732         if (local->scanning)
 733                 return;
 734
 735         /*
 736          * ieee80211_queue_work() should have picked up most cases,
 737          * here we'll pick the rest.
 738          */
 739         if (WARN(local->suspended,
 740                  "interface work scheduled while going to suspend\n"))
 741                 return;
 742
 743         /* first process frames */
 744         while ((skb = skb_dequeue(&sdata->skb_queue))) {
 745                 struct ieee80211_mgmt *mgmt = (void *)skb->data;
 746
 747                 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
 748                         ra_tid = (void *)&skb->cb;
 749                         ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
 750                                                  ra_tid->tid);
 751                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
 752                         ra_tid = (void *)&skb->cb;
 753                         ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
 754                                                 ra_tid->tid);
 755                 } else if (ieee80211_is_action(mgmt->frame_control) &&
 756                            mgmt->u.action.category == WLAN_CATEGORY_BACK) {
 757                         int len = skb->len;
 758
 759                         mutex_lock(&local->sta_mtx);
 760                         sta = sta_info_get_bss(sdata, mgmt->sa);
 761                         if (sta) {
 762                                 switch (mgmt->u.action.u.addba_req.action_code) {
 763                                 case WLAN_ACTION_ADDBA_REQ:
 764                                         ieee80211_process_addba_request(
 765                                                         local, sta, mgmt, len);
 766                                         break;
 767                                 case WLAN_ACTION_ADDBA_RESP:
 768                                         ieee80211_process_addba_resp(local, sta,
 769                                                                      mgmt, len);
 770                                         break;
 771                                 case WLAN_ACTION_DELBA:
 772                                         ieee80211_process_delba(sdata, sta,
 773                                                                 mgmt, len);
 774                                         break;
 775                                 default:
 776                                         WARN_ON(1);
 777                                         break;
 778                                 }
 779                         }
 780                         mutex_unlock(&local->sta_mtx);
 781                 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
 782                         struct ieee80211_hdr *hdr = (void *)mgmt;
 783                         /*
 784                          * So the frame isn't mgmt, but frame_control
 785                          * is at the right place anyway, of course, so
 786                          * the if statement is correct.
 787                          *
 788                          * Warn if we have other data frame types here,
 789                          * they must not get here.
 790                          */
 791                         WARN_ON(hdr->frame_control &
 792                                         cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
 793                         WARN_ON(!(hdr->seq_ctrl &
 794                                         cpu_to_le16(IEEE80211_SCTL_FRAG)));
 795                         /*
 796                          * This was a fragment of a frame, received while
 797                          * a block-ack session was active. That cannot be
 798                          * right, so terminate the session.
 799                          */
 800                         mutex_lock(&local->sta_mtx);
 801                         sta = sta_info_get_bss(sdata, mgmt->sa);
 802                         if (sta) {
 803                                 u16 tid = *ieee80211_get_qos_ctl(hdr) &
 804                                                 IEEE80211_QOS_CTL_TID_MASK;
 805
 806                                 __ieee80211_stop_rx_ba_session(
 807                                         sta, tid, WLAN_BACK_RECIPIENT,
 808                                         WLAN_REASON_QSTA_REQUIRE_SETUP,
 809                                         true);
 810                         }
 811                         mutex_unlock(&local->sta_mtx);
 812                 } else switch (sdata->vif.type) {
 813                 case NL80211_IFTYPE_STATION:
 814                         ieee80211_sta_rx_queued_mgmt(sdata, skb);
 815                         break;
 816                 case NL80211_IFTYPE_ADHOC:
 817                         ieee80211_ibss_rx_queued_mgmt(sdata, skb);
 818                         break;
 819                 case NL80211_IFTYPE_MESH_POINT:
 820                         if (!ieee80211_vif_is_mesh(&sdata->vif))
 821                                 break;
 822                         ieee80211_mesh_rx_queued_mgmt(sdata, skb);
 823                         break;
 824                 default:
 825                         WARN(1, "frame for unexpected interface type");
 826                         break;
 827                 }
 828
 829                 kfree_skb(skb);
 830         }
 831
 832         /* then other type-dependent work */
 833         switch (sdata->vif.type) {
 834         case NL80211_IFTYPE_STATION:
 835                 ieee80211_sta_work(sdata);
 836                 break;
 837         case NL80211_IFTYPE_ADHOC:
 838                 ieee80211_ibss_work(sdata);
 839                 break;
 840         case NL80211_IFTYPE_MESH_POINT:
 841                 if (!ieee80211_vif_is_mesh(&sdata->vif))
 842                         break;
 843                 ieee80211_mesh_work(sdata);
 844                 break;
 845         default:
 846                 break;
 847         }
 848 }
 849
 850
 851 /*
 852  * Helper function to initialise an interface to a specific type.
 853  */
 854 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
 855                                   enum nl80211_iftype type)
 856 {
 857         /* clear type-dependent union */
 858         memset(&sdata->u, 0, sizeof(sdata->u));
 859
 860         /* and set some type-dependent values */
 861         sdata->vif.type = type;
 862         sdata->vif.p2p = false;
 863         sdata->dev->netdev_ops = &ieee80211_dataif_ops;
 864         sdata->wdev.iftype = type;
 865
 866         sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
 867         sdata->control_port_no_encrypt = false;
 868
 869         /* only monitor differs */
 870         sdata->dev->type = ARPHRD_ETHER;
 871
 872         skb_queue_head_init(&sdata->skb_queue);
 873         INIT_WORK(&sdata->work, ieee80211_iface_work);
 874
 875         switch (type) {
 876         case NL80211_IFTYPE_P2P_GO:
 877                 type = NL80211_IFTYPE_AP;
 878                 sdata->vif.type = type;
 879                 sdata->vif.p2p = true;
 880                 /* fall through */
 881         case NL80211_IFTYPE_AP:
 882                 skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
 883                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
 884                 break;
 885         case NL80211_IFTYPE_P2P_CLIENT:
 886                 type = NL80211_IFTYPE_STATION;
 887                 sdata->vif.type = type;
 888                 sdata->vif.p2p = true;
 889                 /* fall through */
 890         case NL80211_IFTYPE_STATION:
 891                 ieee80211_sta_setup_sdata(sdata);
 892                 break;
 893         case NL80211_IFTYPE_ADHOC:
 894                 ieee80211_ibss_setup_sdata(sdata);
 895                 break;
 896         case NL80211_IFTYPE_MESH_POINT:
 897                 if (ieee80211_vif_is_mesh(&sdata->vif))
 898                         ieee80211_mesh_init_sdata(sdata);
 899                 break;
 900         case NL80211_IFTYPE_MONITOR:
 901                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
 902                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
 903                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
 904                                       MONITOR_FLAG_OTHER_BSS;
 905                 break;
 906         case NL80211_IFTYPE_WDS:
 907         case NL80211_IFTYPE_AP_VLAN:
 908                 break;
 909         case NL80211_IFTYPE_UNSPECIFIED:
 910         case NUM_NL80211_IFTYPES:
 911                 BUG();
 912                 break;
 913         }
 914
 915         ieee80211_debugfs_add_netdev(sdata);
 916 }
 917
 918 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
 919                                            enum nl80211_iftype type)
 920 {
 921         struct ieee80211_local *local = sdata->local;
 922         int ret, err;
 923         enum nl80211_iftype internal_type = type;
 924         bool p2p = false;
 925
 926         ASSERT_RTNL();
 927
 928         if (!local->ops->change_interface)
 929                 return -EBUSY;
 930
 931         switch (sdata->vif.type) {
 932         case NL80211_IFTYPE_AP:
 933         case NL80211_IFTYPE_STATION:
 934         case NL80211_IFTYPE_ADHOC:
 935                 /*
 936                  * Could maybe also all others here?
 937                  * Just not sure how that interacts
 938                  * with the RX/config path e.g. for
 939                  * mesh.
 940                  */
 941                 break;
 942         default:
 943                 return -EBUSY;
 944         }
 945
 946         switch (type) {
 947         case NL80211_IFTYPE_AP:
 948         case NL80211_IFTYPE_STATION:
 949         case NL80211_IFTYPE_ADHOC:
 950                 /*
 951                  * Could probably support everything
 952                  * but WDS here (WDS do_open can fail
 953                  * under memory pressure, which this
 954                  * code isn't prepared to handle).
 955                  */
 956                 break;
 957         case NL80211_IFTYPE_P2P_CLIENT:
 958                 p2p = true;
 959                 internal_type = NL80211_IFTYPE_STATION;
 960                 break;
 961         case NL80211_IFTYPE_P2P_GO:
 962                 p2p = true;
 963                 internal_type = NL80211_IFTYPE_AP;
 964                 break;
 965         default:
 966                 return -EBUSY;
 967         }
 968
 969         ret = ieee80211_check_concurrent_iface(sdata, internal_type);
 970         if (ret)
 971                 return ret;
 972
 973         ieee80211_do_stop(sdata, false);
 974
 975         ieee80211_teardown_sdata(sdata->dev);
 976
 977         ret = drv_change_interface(local, sdata, internal_type, p2p);
 978         if (ret)
 979                 type = sdata->vif.type;
 980
 981         ieee80211_setup_sdata(sdata, type);
 982
 983         err = ieee80211_do_open(sdata->dev, false);
 984         WARN(err, "type change: do_open returned %d", err);
 985
 986         return ret;
 987 }
 988
 989 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
 990                              enum nl80211_iftype type)
 991 {
 992         int ret;
 993
 994         ASSERT_RTNL();
 995
 996         if (type == ieee80211_vif_type_p2p(&sdata->vif))
 997                 return 0;
 998
 999         /* Setting ad-hoc mode on non-IBSS channel is not supported. */
1000         if (sdata->local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS &&
1001             type == NL80211_IFTYPE_ADHOC)
1002                 return -EOPNOTSUPP;
1003
1004         if (ieee80211_sdata_running(sdata)) {
1005                 ret = ieee80211_runtime_change_iftype(sdata, type);
1006                 if (ret)
1007                         return ret;
1008         } else {
1009                 /* Purge and reset type-dependent state. */
1010                 ieee80211_teardown_sdata(sdata->dev);
1011                 ieee80211_setup_sdata(sdata, type);
1012         }
1013
1014         /* reset some values that shouldn't be kept across type changes */
1015         sdata->vif.bss_conf.basic_rates =
1016                 ieee80211_mandatory_rates(sdata->local,
1017                         sdata->local->hw.conf.channel->band);
1018         sdata->drop_unencrypted = 0;
1019         if (type == NL80211_IFTYPE_STATION)
1020                 sdata->u.mgd.use_4addr = false;
1021
1022         return 0;
1023 }
1024
1025 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1026                                        struct net_device *dev,
1027                                        enum nl80211_iftype type)
1028 {
1029         struct ieee80211_sub_if_data *sdata;
1030         u64 mask, start, addr, val, inc;
1031         u8 *m;
1032         u8 tmp_addr[ETH_ALEN];
1033         int i;
1034
1035         /* default ... something at least */
1036         memcpy(dev->perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1037
1038         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1039             local->hw.wiphy->n_addresses <= 1)
1040                 return;
1041
1042
1043         mutex_lock(&local->iflist_mtx);
1044
1045         switch (type) {
1046         case NL80211_IFTYPE_MONITOR:
1047                 /* doesn't matter */
1048                 break;
1049         case NL80211_IFTYPE_WDS:
1050         case NL80211_IFTYPE_AP_VLAN:
1051                 /* match up with an AP interface */
1052                 list_for_each_entry(sdata, &local->interfaces, list) {
1053                         if (sdata->vif.type != NL80211_IFTYPE_AP)
1054                                 continue;
1055                         memcpy(dev->perm_addr, sdata->vif.addr, ETH_ALEN);
1056                         break;
1057                 }
1058                 /* keep default if no AP interface present */
1059                 break;
1060         default:
1061                 /* assign a new address if possible -- try n_addresses first */
1062                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1063                         bool used = false;
1064
1065                         list_for_each_entry(sdata, &local->interfaces, list) {
1066                                 if (memcmp(local->hw.wiphy->addresses[i].addr,
1067                                            sdata->vif.addr, ETH_ALEN) == 0) {
1068                                         used = true;
1069                                         break;
1070                                 }
1071                         }
1072
1073                         if (!used) {
1074                                 memcpy(dev->perm_addr,
1075                                        local->hw.wiphy->addresses[i].addr,
1076                                        ETH_ALEN);
1077                                 break;
1078                         }
1079                 }
1080
1081                 /* try mask if available */
1082                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1083                         break;
1084
1085                 m = local->hw.wiphy->addr_mask;
1086                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1087                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1088                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1089
1090                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1091                         /* not a contiguous mask ... not handled now! */
1092                         printk(KERN_DEBUG "not contiguous\n");
1093                         break;
1094                 }
1095
1096                 m = local->hw.wiphy->perm_addr;
1097                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1098                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1099                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1100
1101                 inc = 1ULL<<__ffs64(mask);
1102                 val = (start & mask);
1103                 addr = (start & ~mask) | (val & mask);
1104                 do {
1105                         bool used = false;
1106
1107                         tmp_addr[5] = addr >> 0*8;
1108                         tmp_addr[4] = addr >> 1*8;
1109                         tmp_addr[3] = addr >> 2*8;
1110                         tmp_addr[2] = addr >> 3*8;
1111                         tmp_addr[1] = addr >> 4*8;
1112                         tmp_addr[0] = addr >> 5*8;
1113
1114                         val += inc;
1115
1116                         list_for_each_entry(sdata, &local->interfaces, list) {
1117                                 if (memcmp(tmp_addr, sdata->vif.addr,
1118                                                         ETH_ALEN) == 0) {
1119                                         used = true;
1120                                         break;
1121                                 }
1122                         }
1123
1124                         if (!used) {
1125                                 memcpy(dev->perm_addr, tmp_addr, ETH_ALEN);
1126                                 break;
1127                         }
1128                         addr = (start & ~mask) | (val & mask);
1129                 } while (addr != start);
1130
1131                 break;
1132         }
1133
1134         mutex_unlock(&local->iflist_mtx);
1135 }
1136
1137 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1138                      struct net_device **new_dev, enum nl80211_iftype type,
1139                      struct vif_params *params)
1140 {
1141         struct net_device *ndev;
1142         struct ieee80211_sub_if_data *sdata = NULL;
1143         int ret, i;
1144
1145         ASSERT_RTNL();
1146
1147         ndev = alloc_netdev_mqs(sizeof(*sdata) + local->hw.vif_data_size,
1148                                 name, ieee80211_if_setup, local->hw.queues, 1);
1149         if (!ndev)
1150                 return -ENOMEM;
1151         dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1152
1153         ndev->needed_headroom = local->tx_headroom +
1154                                 4*6 /* four MAC addresses */
1155                                 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1156                                 + 6 /* mesh */
1157                                 + 8 /* rfc1042/bridge tunnel */
1158                                 - ETH_HLEN /* ethernet hard_header_len */
1159                                 + IEEE80211_ENCRYPT_HEADROOM;
1160         ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1161
1162         ret = dev_alloc_name(ndev, ndev->name);
1163         if (ret < 0)
1164                 goto fail;
1165
1166         ieee80211_assign_perm_addr(local, ndev, type);
1167         memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1168         SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1169
1170         /* don't use IEEE80211_DEV_TO_SUB_IF because it checks too much */
1171         sdata = netdev_priv(ndev);
1172         ndev->ieee80211_ptr = &sdata->wdev;
1173         memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1174         memcpy(sdata->name, ndev->name, IFNAMSIZ);
1175
1176         /* initialise type-independent data */
1177         sdata->wdev.wiphy = local->hw.wiphy;
1178         sdata->local = local;
1179         sdata->dev = ndev;
1180 #ifdef CONFIG_INET
1181         sdata->arp_filter_state = true;
1182 #endif
1183
1184         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1185                 skb_queue_head_init(&sdata->fragments[i].skb_list);
1186
1187         INIT_LIST_HEAD(&sdata->key_list);
1188
1189         for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1190                 struct ieee80211_supported_band *sband;
1191                 sband = local->hw.wiphy->bands[i];
1192                 sdata->rc_rateidx_mask[i] =
1193                         sband ? (1 << sband->n_bitrates) - 1 : 0;
1194         }
1195
1196         /* setup type-dependent data */
1197         ieee80211_setup_sdata(sdata, type);
1198
1199         if (params) {
1200                 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1201                 if (type == NL80211_IFTYPE_STATION)
1202                         sdata->u.mgd.use_4addr = params->use_4addr;
1203         }
1204
1205         ret = register_netdevice(ndev);
1206         if (ret)
1207                 goto fail;
1208
1209         mutex_lock(&local->iflist_mtx);
1210         list_add_tail_rcu(&sdata->list, &local->interfaces);
1211         mutex_unlock(&local->iflist_mtx);
1212
1213         if (new_dev)
1214                 *new_dev = ndev;
1215
1216         return 0;
1217
1218  fail:
1219         free_netdev(ndev);
1220         return ret;
1221 }
1222
1223 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1224 {
1225         ASSERT_RTNL();
1226
1227         mutex_lock(&sdata->local->iflist_mtx);
1228         list_del_rcu(&sdata->list);
1229         mutex_unlock(&sdata->local->iflist_mtx);
1230
1231         if (ieee80211_vif_is_mesh(&sdata->vif))
1232                 mesh_path_flush_by_iface(sdata);
1233
1234         synchronize_rcu();
1235         unregister_netdevice(sdata->dev);
1236 }
1237
1238 /*
1239  * Remove all interfaces, may only be called at hardware unregistration
1240  * time because it doesn't do RCU-safe list removals.
1241  */
1242 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1243 {
1244         struct ieee80211_sub_if_data *sdata, *tmp;
1245         LIST_HEAD(unreg_list);
1246
1247         ASSERT_RTNL();
1248
1249         mutex_lock(&local->iflist_mtx);
1250         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1251                 list_del(&sdata->list);
1252
1253                 if (ieee80211_vif_is_mesh(&sdata->vif))
1254                         mesh_path_flush_by_iface(sdata);
1255
1256                 unregister_netdevice_queue(sdata->dev, &unreg_list);
1257         }
1258         mutex_unlock(&local->iflist_mtx);
1259         unregister_netdevice_many(&unreg_list);
1260         list_del(&unreg_list);
1261 }
1262
1263 static u32 ieee80211_idle_off(struct ieee80211_local *local,
1264                               const char *reason)
1265 {
1266         if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
1267                 return 0;
1268
1269 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1270         wiphy_debug(local->hw.wiphy, "device no longer idle - %s\n", reason);
1271 #endif
1272
1273         local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
1274         return IEEE80211_CONF_CHANGE_IDLE;
1275 }
1276
1277 static u32 ieee80211_idle_on(struct ieee80211_local *local)
1278 {
1279         if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
1280                 return 0;
1281
1282 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1283         wiphy_debug(local->hw.wiphy, "device now idle\n");
1284 #endif
1285
1286         drv_flush(local, false);
1287
1288         local->hw.conf.flags |= IEEE80211_CONF_IDLE;
1289         return IEEE80211_CONF_CHANGE_IDLE;
1290 }
1291
1292 u32 __ieee80211_recalc_idle(struct ieee80211_local *local)
1293 {
1294         struct ieee80211_sub_if_data *sdata;
1295         int count = 0;
1296         bool working = false, scanning = false, hw_roc = false;
1297         struct ieee80211_work *wk;
1298         unsigned int led_trig_start = 0, led_trig_stop = 0;
1299
1300 #ifdef CONFIG_PROVE_LOCKING
1301         WARN_ON(debug_locks && !lockdep_rtnl_is_held() &&
1302                 !lockdep_is_held(&local->iflist_mtx));
1303 #endif
1304         lockdep_assert_held(&local->mtx);
1305
1306         list_for_each_entry(sdata, &local->interfaces, list) {
1307                 if (!ieee80211_sdata_running(sdata)) {
1308                         sdata->vif.bss_conf.idle = true;
1309                         continue;
1310                 }
1311
1312                 sdata->old_idle = sdata->vif.bss_conf.idle;
1313
1314                 /* do not count disabled managed interfaces */
1315                 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1316                     !sdata->u.mgd.associated) {
1317                         sdata->vif.bss_conf.idle = true;
1318                         continue;
1319                 }
1320                 /* do not count unused IBSS interfaces */
1321                 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
1322                     !sdata->u.ibss.ssid_len) {
1323                         sdata->vif.bss_conf.idle = true;
1324                         continue;
1325                 }
1326                 /* count everything else */
1327                 count++;
1328         }
1329
1330         list_for_each_entry(wk, &local->work_list, list) {
1331                 working = true;
1332                 wk->sdata->vif.bss_conf.idle = false;
1333         }
1334
1335         if (local->scan_sdata) {
1336                 scanning = true;
1337                 local->scan_sdata->vif.bss_conf.idle = false;
1338         }
1339
1340         if (local->hw_roc_channel)
1341                 hw_roc = true;
1342
1343         list_for_each_entry(sdata, &local->interfaces, list) {
1344                 if (sdata->old_idle == sdata->vif.bss_conf.idle)
1345                         continue;
1346                 if (!ieee80211_sdata_running(sdata))
1347                         continue;
1348                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_IDLE);
1349         }
1350
1351         if (working || scanning || hw_roc)
1352                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
1353         else
1354                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
1355
1356         if (count)
1357                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
1358         else
1359                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
1360
1361         ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
1362
1363         if (hw_roc)
1364                 return ieee80211_idle_off(local, "hw remain-on-channel");
1365         if (working)
1366                 return ieee80211_idle_off(local, "working");
1367         if (scanning)
1368                 return ieee80211_idle_off(local, "scanning");
1369         if (!count)
1370                 return ieee80211_idle_on(local);
1371         else
1372                 return ieee80211_idle_off(local, "in use");
1373
1374         return 0;
1375 }
1376
1377 void ieee80211_recalc_idle(struct ieee80211_local *local)
1378 {
1379         u32 chg;
1380
1381         mutex_lock(&local->iflist_mtx);
1382         chg = __ieee80211_recalc_idle(local);
1383         mutex_unlock(&local->iflist_mtx);
1384         if (chg)
1385                 ieee80211_hw_config(local, chg);
1386 }
1387
1388 static int netdev_notify(struct notifier_block *nb,
1389                          unsigned long state,
1390                          void *ndev)
1391 {
1392         struct net_device *dev = ndev;
1393         struct ieee80211_sub_if_data *sdata;
1394
1395         if (state != NETDEV_CHANGENAME)
1396                 return 0;
1397
1398         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1399                 return 0;
1400
1401         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1402                 return 0;
1403
1404         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1405
1406         memcpy(sdata->name, dev->name, IFNAMSIZ);
1407
1408         ieee80211_debugfs_rename_netdev(sdata);
1409         return 0;
1410 }
1411
1412 static struct notifier_block mac80211_netdev_notifier = {
1413         .notifier_call = netdev_notify,
1414 };
1415
1416 int ieee80211_iface_init(void)
1417 {
1418         return register_netdevice_notifier(&mac80211_netdev_notifier);
1419 }
1420
1421 void ieee80211_iface_exit(void)
1422 {
1423         unregister_netdevice_notifier(&mac80211_netdev_notifier);
1424 }