net/mac80211/iface.c

   1 /*
   2  * Interface handling (except master interface)
   3  *
   4  * Copyright 2002-2005, Instant802 Networks, Inc.
   5  * Copyright 2005-2006, Devicescape Software, Inc.
   6  * Copyright (c) 2006 Jiri Benc <jbenc@suse.cz>
   7  * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13 #include <linux/slab.h>
  14 #include <linux/kernel.h>
  15 #include <linux/if_arp.h>
  16 #include <linux/netdevice.h>
  17 #include <linux/rtnetlink.h>
  18 #include <net/mac80211.h>
  19 #include <net/ieee80211_radiotap.h>
  20 #include "ieee80211_i.h"
  21 #include "sta_info.h"
  22 #include "debugfs_netdev.h"
  23 #include "mesh.h"
  24 #include "led.h"
  25 #include "driver-ops.h"
  26 #include "wme.h"
  27 #include "rate.h"
  28
  29 /**
  30  * DOC: Interface list locking
  31  *
  32  * The interface list in each struct ieee80211_local is protected
  33  * three-fold:
  34  *
  35  * (1) modifications may only be done under the RTNL
  36  * (2) modifications and readers are protected against each other by
  37  *     the iflist_mtx.
  38  * (3) modifications are done in an RCU manner so atomic readers
  39  *     can traverse the list in RCU-safe blocks.
  40  *
  41  * As a consequence, reads (traversals) of the list can be protected
  42  * by either the RTNL, the iflist_mtx or RCU.
  43  */
  44
  45
  46 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
  47 {
  48         int meshhdrlen;
  49         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
  50
  51         meshhdrlen = (sdata->vif.type == NL80211_IFTYPE_MESH_POINT) ? 5 : 0;
  52
  53         /* FIX: what would be proper limits for MTU?
  54          * This interface uses 802.3 frames. */
  55         if (new_mtu < 256 ||
  56             new_mtu > IEEE80211_MAX_DATA_LEN - 24 - 6 - meshhdrlen) {
  57                 return -EINVAL;
  58         }
  59
  60 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
  61         printk(KERN_DEBUG "%s: setting MTU %d\n", dev->name, new_mtu);
  62 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
  63         dev->mtu = new_mtu;
  64         return 0;
  65 }
  66
  67 static int ieee80211_change_mac(struct net_device *dev, void *addr)
  68 {
  69         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
  70         struct sockaddr *sa = addr;
  71         int ret;
  72
  73         if (ieee80211_sdata_running(sdata))
  74                 return -EBUSY;
  75
  76         ret = eth_mac_addr(dev, sa);
  77
  78         if (ret == 0)
  79                 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
  80
  81         return ret;
  82 }
  83
  84 static inline int identical_mac_addr_allowed(int type1, int type2)
  85 {
  86         return type1 == NL80211_IFTYPE_MONITOR ||
  87                 type2 == NL80211_IFTYPE_MONITOR ||
  88                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
  89                 (type1 == NL80211_IFTYPE_WDS &&
  90                         (type2 == NL80211_IFTYPE_WDS ||
  91                          type2 == NL80211_IFTYPE_AP)) ||
  92                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
  93                 (type1 == NL80211_IFTYPE_AP_VLAN &&
  94                         (type2 == NL80211_IFTYPE_AP ||
  95                          type2 == NL80211_IFTYPE_AP_VLAN));
  96 }
  97
  98 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
  99                                             enum nl80211_iftype iftype)
 100 {
 101         struct ieee80211_local *local = sdata->local;
 102         struct ieee80211_sub_if_data *nsdata;
 103         struct net_device *dev = sdata->dev;
 104
 105         ASSERT_RTNL();
 106
 107         /* we hold the RTNL here so can safely walk the list */
 108         list_for_each_entry(nsdata, &local->interfaces, list) {
 109                 struct net_device *ndev = nsdata->dev;
 110
 111                 if (ndev != dev && ieee80211_sdata_running(nsdata)) {
 112                         /*
 113                          * Allow only a single IBSS interface to be up at any
 114                          * time. This is restricted because beacon distribution
 115                          * cannot work properly if both are in the same IBSS.
 116                          *
 117                          * To remove this restriction we'd have to disallow them
 118                          * from setting the same SSID on different IBSS interfaces
 119                          * belonging to the same hardware. Then, however, we're
 120                          * faced with having to adopt two different TSF timers...
 121                          */
 122                         if (iftype == NL80211_IFTYPE_ADHOC &&
 123                             nsdata->vif.type == NL80211_IFTYPE_ADHOC)
 124                                 return -EBUSY;
 125
 126                         /*
 127                          * The remaining checks are only performed for interfaces
 128                          * with the same MAC address.
 129                          */
 130                         if (compare_ether_addr(dev->dev_addr, ndev->dev_addr))
 131                                 continue;
 132
 133                         /*
 134                          * check whether it may have the same address
 135                          */
 136                         if (!identical_mac_addr_allowed(iftype,
 137                                                         nsdata->vif.type))
 138                                 return -ENOTUNIQ;
 139
 140                         /*
 141                          * can only add VLANs to enabled APs
 142                          */
 143                         if (iftype == NL80211_IFTYPE_AP_VLAN &&
 144                             nsdata->vif.type == NL80211_IFTYPE_AP)
 145                                 sdata->bss = &nsdata->u.ap;
 146                 }
 147         }
 148
 149         return 0;
 150 }
 151
 152 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
 153                                     const int offset)
 154 {
 155         struct ieee80211_local *local = sdata->local;
 156         u32 flags = sdata->u.mntr_flags;
 157
 158 #define ADJUST(_f, _s)  do {                                    \
 159         if (flags & MONITOR_FLAG_##_f)                          \
 160                 local->fif_##_s += offset;                      \
 161         } while (0)
 162
 163         ADJUST(FCSFAIL, fcsfail);
 164         ADJUST(PLCPFAIL, plcpfail);
 165         ADJUST(CONTROL, control);
 166         ADJUST(CONTROL, pspoll);
 167         ADJUST(OTHER_BSS, other_bss);
 168
 169 #undef ADJUST
 170 }
 171
 172 /*
 173  * NOTE: Be very careful when changing this function, it must NOT return
 174  * an error on interface type changes that have been pre-checked, so most
 175  * checks should be in ieee80211_check_concurrent_iface.
 176  */
 177 static int ieee80211_do_open(struct net_device *dev, bool coming_up)
 178 {
 179         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 180         struct ieee80211_local *local = sdata->local;
 181         struct sta_info *sta;
 182         u32 changed = 0;
 183         int res;
 184         u32 hw_reconf_flags = 0;
 185
 186         switch (sdata->vif.type) {
 187         case NL80211_IFTYPE_WDS:
 188                 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
 189                         return -ENOLINK;
 190                 break;
 191         case NL80211_IFTYPE_AP_VLAN:
 192                 if (!sdata->bss)
 193                         return -ENOLINK;
 194                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
 195                 break;
 196         case NL80211_IFTYPE_AP:
 197                 sdata->bss = &sdata->u.ap;
 198                 break;
 199         case NL80211_IFTYPE_MESH_POINT:
 200                 if (!ieee80211_vif_is_mesh(&sdata->vif))
 201                         break;
 202                 /* mesh ifaces must set allmulti to forward mcast traffic */
 203                 atomic_inc(&local->iff_allmultis);
 204                 break;
 205         case NL80211_IFTYPE_STATION:
 206         case NL80211_IFTYPE_MONITOR:
 207         case NL80211_IFTYPE_ADHOC:
 208                 /* no special treatment */
 209                 break;
 210         case NL80211_IFTYPE_UNSPECIFIED:
 211         case NUM_NL80211_IFTYPES:
 212         case NL80211_IFTYPE_P2P_CLIENT:
 213         case NL80211_IFTYPE_P2P_GO:
 214                 /* cannot happen */
 215                 WARN_ON(1);
 216                 break;
 217         }
 218
 219         if (local->open_count == 0) {
 220                 res = drv_start(local);
 221                 if (res)
 222                         goto err_del_bss;
 223                 if (local->ops->napi_poll)
 224                         napi_enable(&local->napi);
 225                 /* we're brought up, everything changes */
 226                 hw_reconf_flags = ~0;
 227                 ieee80211_led_radio(local, true);
 228         }
 229
 230         /*
 231          * Copy the hopefully now-present MAC address to
 232          * this interface, if it has the special null one.
 233          */
 234         if (is_zero_ether_addr(dev->dev_addr)) {
 235                 memcpy(dev->dev_addr,
 236                        local->hw.wiphy->perm_addr,
 237                        ETH_ALEN);
 238                 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
 239
 240                 if (!is_valid_ether_addr(dev->dev_addr)) {
 241                         if (!local->open_count)
 242                                 drv_stop(local);
 243                         return -EADDRNOTAVAIL;
 244                 }
 245         }
 246
 247         switch (sdata->vif.type) {
 248         case NL80211_IFTYPE_AP_VLAN:
 249                 /* no need to tell driver */
 250                 break;
 251         case NL80211_IFTYPE_MONITOR:
 252                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 253                         local->cooked_mntrs++;
 254                         break;
 255                 }
 256
 257                 /* must be before the call to ieee80211_configure_filter */
 258                 local->monitors++;
 259                 if (local->monitors == 1) {
 260                         local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
 261                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 262                 }
 263
 264                 ieee80211_adjust_monitor_flags(sdata, 1);
 265                 ieee80211_configure_filter(local);
 266
 267                 netif_carrier_on(dev);
 268                 break;
 269         default:
 270                 if (coming_up) {
 271                         res = drv_add_interface(local, &sdata->vif);
 272                         if (res)
 273                                 goto err_stop;
 274                 }
 275
 276                 if (ieee80211_vif_is_mesh(&sdata->vif)) {
 277                         local->fif_other_bss++;
 278                         ieee80211_configure_filter(local);
 279
 280                         ieee80211_start_mesh(sdata);
 281                 } else if (sdata->vif.type == NL80211_IFTYPE_AP) {
 282                         local->fif_pspoll++;
 283                         local->fif_probe_req++;
 284
 285                         ieee80211_configure_filter(local);
 286                 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 287                         local->fif_probe_req++;
 288                 }
 289
 290                 changed |= ieee80211_reset_erp_info(sdata);
 291                 ieee80211_bss_info_change_notify(sdata, changed);
 292
 293                 if (sdata->vif.type == NL80211_IFTYPE_STATION)
 294                         netif_carrier_off(dev);
 295                 else
 296                         netif_carrier_on(dev);
 297         }
 298
 299         set_bit(SDATA_STATE_RUNNING, &sdata->state);
 300
 301         if (sdata->vif.type == NL80211_IFTYPE_WDS) {
 302                 /* Create STA entry for the WDS peer */
 303                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
 304                                      GFP_KERNEL);
 305                 if (!sta) {
 306                         res = -ENOMEM;
 307                         goto err_del_interface;
 308                 }
 309
 310                 /* no locking required since STA is not live yet */
 311                 sta->flags |= WLAN_STA_AUTHORIZED;
 312
 313                 res = sta_info_insert(sta);
 314                 if (res) {
 315                         /* STA has been freed */
 316                         goto err_del_interface;
 317                 }
 318
 319                 rate_control_rate_init(sta);
 320         }
 321
 322         /*
 323          * set_multicast_list will be invoked by the networking core
 324          * which will check whether any increments here were done in
 325          * error and sync them down to the hardware as filter flags.
 326          */
 327         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 328                 atomic_inc(&local->iff_allmultis);
 329
 330         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 331                 atomic_inc(&local->iff_promiscs);
 332
 333         mutex_lock(&local->mtx);
 334         hw_reconf_flags |= __ieee80211_recalc_idle(local);
 335         mutex_unlock(&local->mtx);
 336
 337         if (coming_up)
 338                 local->open_count++;
 339
 340         if (hw_reconf_flags) {
 341                 ieee80211_hw_config(local, hw_reconf_flags);
 342                 /*
 343                  * set default queue parameters so drivers don't
 344                  * need to initialise the hardware if the hardware
 345                  * doesn't start up with sane defaults
 346                  */
 347                 ieee80211_set_wmm_default(sdata);
 348         }
 349
 350         ieee80211_recalc_ps(local, -1);
 351
 352         netif_tx_start_all_queues(dev);
 353
 354         return 0;
 355  err_del_interface:
 356         drv_remove_interface(local, &sdata->vif);
 357  err_stop:
 358         if (!local->open_count)
 359                 drv_stop(local);
 360  err_del_bss:
 361         sdata->bss = NULL;
 362         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
 363                 list_del(&sdata->u.vlan.list);
 364         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 365         return res;
 366 }
 367
 368 static int ieee80211_open(struct net_device *dev)
 369 {
 370         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 371         int err;
 372
 373         /* fail early if user set an invalid address */
 374         if (!is_zero_ether_addr(dev->dev_addr) &&
 375             !is_valid_ether_addr(dev->dev_addr))
 376                 return -EADDRNOTAVAIL;
 377
 378         err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
 379         if (err)
 380                 return err;
 381
 382         return ieee80211_do_open(dev, true);
 383 }
 384
 385 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
 386                               bool going_down)
 387 {
 388         struct ieee80211_local *local = sdata->local;
 389         unsigned long flags;
 390         struct sk_buff *skb, *tmp;
 391         u32 hw_reconf_flags = 0;
 392         int i;
 393
 394         if (local->scan_sdata == sdata)
 395                 ieee80211_scan_cancel(local);
 396
 397         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 398
 399         /*
 400          * Stop TX on this interface first.
 401          */
 402         netif_tx_stop_all_queues(sdata->dev);
 403
 404         /*
 405          * Purge work for this interface.
 406          */
 407         ieee80211_work_purge(sdata);
 408
 409         /*
 410          * Remove all stations associated with this interface.
 411          *
 412          * This must be done before calling ops->remove_interface()
 413          * because otherwise we can later invoke ops->sta_notify()
 414          * whenever the STAs are removed, and that invalidates driver
 415          * assumptions about always getting a vif pointer that is valid
 416          * (because if we remove a STA after ops->remove_interface()
 417          * the driver will have removed the vif info already!)
 418          *
 419          * This is relevant only in AP, WDS and mesh modes, since in
 420          * all other modes we've already removed all stations when
 421          * disconnecting etc.
 422          */
 423         sta_info_flush(local, sdata);
 424
 425         /*
 426          * Don't count this interface for promisc/allmulti while it
 427          * is down. dev_mc_unsync() will invoke set_multicast_list
 428          * on the master interface which will sync these down to the
 429          * hardware as filter flags.
 430          */
 431         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 432                 atomic_dec(&local->iff_allmultis);
 433
 434         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 435                 atomic_dec(&local->iff_promiscs);
 436
 437         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 438                 local->fif_pspoll--;
 439                 local->fif_probe_req--;
 440         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 441                 local->fif_probe_req--;
 442         }
 443
 444         netif_addr_lock_bh(sdata->dev);
 445         spin_lock_bh(&local->filter_lock);
 446         __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
 447                          sdata->dev->addr_len);
 448         spin_unlock_bh(&local->filter_lock);
 449         netif_addr_unlock_bh(sdata->dev);
 450
 451         ieee80211_configure_filter(local);
 452
 453         del_timer_sync(&local->dynamic_ps_timer);
 454         cancel_work_sync(&local->dynamic_ps_enable_work);
 455
 456         /* APs need special treatment */
 457         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 458                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
 459                 struct beacon_data *old_beacon = sdata->u.ap.beacon;
 460
 461                 /* sdata_running will return false, so this will disable */
 462                 ieee80211_bss_info_change_notify(sdata,
 463                                                  BSS_CHANGED_BEACON_ENABLED);
 464
 465                 /* remove beacon */
 466                 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
 467                 synchronize_rcu();
 468                 kfree(old_beacon);
 469
 470                 /* free all potentially still buffered bcast frames */
 471                 while ((skb = skb_dequeue(&sdata->u.ap.ps_bc_buf))) {
 472                         local->total_ps_buffered--;
 473                         dev_kfree_skb(skb);
 474                 }
 475
 476                 /* down all dependent devices, that is VLANs */
 477                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
 478                                          u.vlan.list)
 479                         dev_close(vlan->dev);
 480                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
 481         }
 482
 483         if (going_down)
 484                 local->open_count--;
 485
 486         switch (sdata->vif.type) {
 487         case NL80211_IFTYPE_AP_VLAN:
 488                 list_del(&sdata->u.vlan.list);
 489                 /* no need to tell driver */
 490                 break;
 491         case NL80211_IFTYPE_MONITOR:
 492                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 493                         local->cooked_mntrs--;
 494                         break;
 495                 }
 496
 497                 local->monitors--;
 498                 if (local->monitors == 0) {
 499                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
 500                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 501                 }
 502
 503                 ieee80211_adjust_monitor_flags(sdata, -1);
 504                 ieee80211_configure_filter(local);
 505                 break;
 506         case NL80211_IFTYPE_MESH_POINT:
 507                 if (ieee80211_vif_is_mesh(&sdata->vif)) {
 508                         /* other_bss and allmulti are always set on mesh
 509                          * ifaces */
 510                         local->fif_other_bss--;
 511                         atomic_dec(&local->iff_allmultis);
 512
 513                         ieee80211_configure_filter(local);
 514
 515                         ieee80211_stop_mesh(sdata);
 516                 }
 517                 /* fall through */
 518         default:
 519                 flush_work(&sdata->work);
 520                 /*
 521                  * When we get here, the interface is marked down.
 522                  * Call synchronize_rcu() to wait for the RX path
 523                  * should it be using the interface and enqueuing
 524                  * frames at this very time on another CPU.
 525                  */
 526                 synchronize_rcu();
 527                 skb_queue_purge(&sdata->skb_queue);
 528
 529                 /*
 530                  * Disable beaconing here for mesh only, AP and IBSS
 531                  * are already taken care of.
 532                  */
 533                 if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
 534                         ieee80211_bss_info_change_notify(sdata,
 535                                 BSS_CHANGED_BEACON_ENABLED);
 536
 537                 /*
 538                  * Free all remaining keys, there shouldn't be any,
 539                  * except maybe group keys in AP more or WDS?
 540                  */
 541                 ieee80211_free_keys(sdata);
 542
 543                 if (going_down)
 544                         drv_remove_interface(local, &sdata->vif);
 545         }
 546
 547         sdata->bss = NULL;
 548
 549         mutex_lock(&local->mtx);
 550         hw_reconf_flags |= __ieee80211_recalc_idle(local);
 551         mutex_unlock(&local->mtx);
 552
 553         ieee80211_recalc_ps(local, -1);
 554
 555         if (local->open_count == 0) {
 556                 if (local->ops->napi_poll)
 557                         napi_disable(&local->napi);
 558                 ieee80211_clear_tx_pending(local);
 559                 ieee80211_stop_device(local);
 560
 561                 /* no reconfiguring after stop! */
 562                 hw_reconf_flags = 0;
 563         }
 564
 565         /* do after stop to avoid reconfiguring when we stop anyway */
 566         if (hw_reconf_flags)
 567                 ieee80211_hw_config(local, hw_reconf_flags);
 568
 569         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 570         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 571                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
 572                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 573                         if (info->control.vif == &sdata->vif) {
 574                                 __skb_unlink(skb, &local->pending[i]);
 575                                 dev_kfree_skb_irq(skb);
 576                         }
 577                 }
 578         }
 579         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 580 }
 581
 582 static int ieee80211_stop(struct net_device *dev)
 583 {
 584         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 585
 586         ieee80211_do_stop(sdata, true);
 587
 588         return 0;
 589 }
 590
 591 static void ieee80211_set_multicast_list(struct net_device *dev)
 592 {
 593         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 594         struct ieee80211_local *local = sdata->local;
 595         int allmulti, promisc, sdata_allmulti, sdata_promisc;
 596
 597         allmulti = !!(dev->flags & IFF_ALLMULTI);
 598         promisc = !!(dev->flags & IFF_PROMISC);
 599         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
 600         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
 601
 602         if (allmulti != sdata_allmulti) {
 603                 if (dev->flags & IFF_ALLMULTI)
 604                         atomic_inc(&local->iff_allmultis);
 605                 else
 606                         atomic_dec(&local->iff_allmultis);
 607                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
 608         }
 609
 610         if (promisc != sdata_promisc) {
 611                 if (dev->flags & IFF_PROMISC)
 612                         atomic_inc(&local->iff_promiscs);
 613                 else
 614                         atomic_dec(&local->iff_promiscs);
 615                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
 616         }
 617         spin_lock_bh(&local->filter_lock);
 618         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
 619         spin_unlock_bh(&local->filter_lock);
 620         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
 621 }
 622
 623 /*
 624  * Called when the netdev is removed or, by the code below, before
 625  * the interface type changes.
 626  */
 627 static void ieee80211_teardown_sdata(struct net_device *dev)
 628 {
 629         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 630         struct ieee80211_local *local = sdata->local;
 631         int flushed;
 632         int i;
 633
 634         /* free extra data */
 635         ieee80211_free_keys(sdata);
 636
 637         ieee80211_debugfs_remove_netdev(sdata);
 638
 639         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
 640                 __skb_queue_purge(&sdata->fragments[i].skb_list);
 641         sdata->fragment_next = 0;
 642
 643         if (ieee80211_vif_is_mesh(&sdata->vif))
 644                 mesh_rmc_free(sdata);
 645
 646         flushed = sta_info_flush(local, sdata);
 647         WARN_ON(flushed);
 648 }
 649
 650 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
 651                                          struct sk_buff *skb)
 652 {
 653         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
 654 }
 655
 656 static const struct net_device_ops ieee80211_dataif_ops = {
 657         .ndo_open               = ieee80211_open,
 658         .ndo_stop               = ieee80211_stop,
 659         .ndo_uninit             = ieee80211_teardown_sdata,
 660         .ndo_start_xmit         = ieee80211_subif_start_xmit,
 661         .ndo_set_multicast_list = ieee80211_set_multicast_list,
 662         .ndo_change_mtu         = ieee80211_change_mtu,
 663         .ndo_set_mac_address    = ieee80211_change_mac,
 664         .ndo_select_queue       = ieee80211_netdev_select_queue,
 665 };
 666
 667 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
 668                                           struct sk_buff *skb)
 669 {
 670         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 671         struct ieee80211_local *local = sdata->local;
 672         struct ieee80211_hdr *hdr;
 673         struct ieee80211_radiotap_header *rtap = (void *)skb->data;
 674         u8 *p;
 675
 676         if (local->hw.queues < 4)
 677                 return 0;
 678
 679         if (skb->len < 4 ||
 680             skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
 681                 return 0; /* doesn't matter, frame will be dropped */
 682
 683         hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
 684
 685         if (!ieee80211_is_data(hdr->frame_control)) {
 686                 skb->priority = 7;
 687                 return ieee802_1d_to_ac[skb->priority];
 688         }
 689         if (!ieee80211_is_data_qos(hdr->frame_control)) {
 690                 skb->priority = 0;
 691                 return ieee802_1d_to_ac[skb->priority];
 692         }
 693
 694         p = ieee80211_get_qos_ctl(hdr);
 695         skb->priority = *p & IEEE80211_QOS_CTL_TAG1D_MASK;
 696
 697         return ieee80211_downgrade_queue(local, skb);
 698 }
 699
 700 static const struct net_device_ops ieee80211_monitorif_ops = {
 701         .ndo_open               = ieee80211_open,
 702         .ndo_stop               = ieee80211_stop,
 703         .ndo_uninit             = ieee80211_teardown_sdata,
 704         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
 705         .ndo_set_multicast_list = ieee80211_set_multicast_list,
 706         .ndo_change_mtu         = ieee80211_change_mtu,
 707         .ndo_set_mac_address    = eth_mac_addr,
 708         .ndo_select_queue       = ieee80211_monitor_select_queue,
 709 };
 710
 711 static void ieee80211_if_setup(struct net_device *dev)
 712 {
 713         ether_setup(dev);
 714         dev->netdev_ops = &ieee80211_dataif_ops;
 715         dev->destructor = free_netdev;
 716 }
 717
 718 static void ieee80211_iface_work(struct work_struct *work)
 719 {
 720         struct ieee80211_sub_if_data *sdata =
 721                 container_of(work, struct ieee80211_sub_if_data, work);
 722         struct ieee80211_local *local = sdata->local;
 723         struct sk_buff *skb;
 724         struct sta_info *sta;
 725         struct ieee80211_ra_tid *ra_tid;
 726
 727         if (!ieee80211_sdata_running(sdata))
 728                 return;
 729
 730         if (local->scanning)
 731                 return;
 732
 733         /*
 734          * ieee80211_queue_work() should have picked up most cases,
 735          * here we'll pick the rest.
 736          */
 737         if (WARN(local->suspended,
 738                  "interface work scheduled while going to suspend\n"))
 739                 return;
 740
 741         /* first process frames */
 742         while ((skb = skb_dequeue(&sdata->skb_queue))) {
 743                 struct ieee80211_mgmt *mgmt = (void *)skb->data;
 744
 745                 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
 746                         ra_tid = (void *)&skb->cb;
 747                         ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
 748                                                  ra_tid->tid);
 749                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
 750                         ra_tid = (void *)&skb->cb;
 751                         ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
 752                                                 ra_tid->tid);
 753                 } else if (ieee80211_is_action(mgmt->frame_control) &&
 754                            mgmt->u.action.category == WLAN_CATEGORY_BACK) {
 755                         int len = skb->len;
 756
 757                         mutex_lock(&local->sta_mtx);
 758                         sta = sta_info_get_bss(sdata, mgmt->sa);
 759                         if (sta) {
 760                                 switch (mgmt->u.action.u.addba_req.action_code) {
 761                                 case WLAN_ACTION_ADDBA_REQ:
 762                                         ieee80211_process_addba_request(
 763                                                         local, sta, mgmt, len);
 764                                         break;
 765                                 case WLAN_ACTION_ADDBA_RESP:
 766                                         ieee80211_process_addba_resp(local, sta,
 767                                                                      mgmt, len);
 768                                         break;
 769                                 case WLAN_ACTION_DELBA:
 770                                         ieee80211_process_delba(sdata, sta,
 771                                                                 mgmt, len);
 772                                         break;
 773                                 default:
 774                                         WARN_ON(1);
 775                                         break;
 776                                 }
 777                         }
 778                         mutex_unlock(&local->sta_mtx);
 779                 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
 780                         struct ieee80211_hdr *hdr = (void *)mgmt;
 781                         /*
 782                          * So the frame isn't mgmt, but frame_control
 783                          * is at the right place anyway, of course, so
 784                          * the if statement is correct.
 785                          *
 786                          * Warn if we have other data frame types here,
 787                          * they must not get here.
 788                          */
 789                         WARN_ON(hdr->frame_control &
 790                                         cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
 791                         WARN_ON(!(hdr->seq_ctrl &
 792                                         cpu_to_le16(IEEE80211_SCTL_FRAG)));
 793                         /*
 794                          * This was a fragment of a frame, received while
 795                          * a block-ack session was active. That cannot be
 796                          * right, so terminate the session.
 797                          */
 798                         mutex_lock(&local->sta_mtx);
 799                         sta = sta_info_get_bss(sdata, mgmt->sa);
 800                         if (sta) {
 801                                 u16 tid = *ieee80211_get_qos_ctl(hdr) &
 802                                                 IEEE80211_QOS_CTL_TID_MASK;
 803
 804                                 __ieee80211_stop_rx_ba_session(
 805                                         sta, tid, WLAN_BACK_RECIPIENT,
 806                                         WLAN_REASON_QSTA_REQUIRE_SETUP,
 807                                         true);
 808                         }
 809                         mutex_unlock(&local->sta_mtx);
 810                 } else switch (sdata->vif.type) {
 811                 case NL80211_IFTYPE_STATION:
 812                         ieee80211_sta_rx_queued_mgmt(sdata, skb);
 813                         break;
 814                 case NL80211_IFTYPE_ADHOC:
 815                         ieee80211_ibss_rx_queued_mgmt(sdata, skb);
 816                         break;
 817                 case NL80211_IFTYPE_MESH_POINT:
 818                         if (!ieee80211_vif_is_mesh(&sdata->vif))
 819                                 break;
 820                         ieee80211_mesh_rx_queued_mgmt(sdata, skb);
 821                         break;
 822                 default:
 823                         WARN(1, "frame for unexpected interface type");
 824                         break;
 825                 }
 826
 827                 kfree_skb(skb);
 828         }
 829
 830         /* then other type-dependent work */
 831         switch (sdata->vif.type) {
 832         case NL80211_IFTYPE_STATION:
 833                 ieee80211_sta_work(sdata);
 834                 break;
 835         case NL80211_IFTYPE_ADHOC:
 836                 ieee80211_ibss_work(sdata);
 837                 break;
 838         case NL80211_IFTYPE_MESH_POINT:
 839                 if (!ieee80211_vif_is_mesh(&sdata->vif))
 840                         break;
 841                 ieee80211_mesh_work(sdata);
 842                 break;
 843         default:
 844                 break;
 845         }
 846 }
 847
 848
 849 /*
 850  * Helper function to initialise an interface to a specific type.
 851  */
 852 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
 853                                   enum nl80211_iftype type)
 854 {
 855         /* clear type-dependent union */
 856         memset(&sdata->u, 0, sizeof(sdata->u));
 857
 858         /* and set some type-dependent values */
 859         sdata->vif.type = type;
 860         sdata->vif.p2p = false;
 861         sdata->dev->netdev_ops = &ieee80211_dataif_ops;
 862         sdata->wdev.iftype = type;
 863
 864         sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
 865         sdata->control_port_no_encrypt = false;
 866
 867         /* only monitor differs */
 868         sdata->dev->type = ARPHRD_ETHER;
 869
 870         skb_queue_head_init(&sdata->skb_queue);
 871         INIT_WORK(&sdata->work, ieee80211_iface_work);
 872
 873         switch (type) {
 874         case NL80211_IFTYPE_P2P_GO:
 875                 type = NL80211_IFTYPE_AP;
 876                 sdata->vif.type = type;
 877                 sdata->vif.p2p = true;
 878                 /* fall through */
 879         case NL80211_IFTYPE_AP:
 880                 skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
 881                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
 882                 break;
 883         case NL80211_IFTYPE_P2P_CLIENT:
 884                 type = NL80211_IFTYPE_STATION;
 885                 sdata->vif.type = type;
 886                 sdata->vif.p2p = true;
 887                 /* fall through */
 888         case NL80211_IFTYPE_STATION:
 889                 ieee80211_sta_setup_sdata(sdata);
 890                 break;
 891         case NL80211_IFTYPE_ADHOC:
 892                 ieee80211_ibss_setup_sdata(sdata);
 893                 break;
 894         case NL80211_IFTYPE_MESH_POINT:
 895                 if (ieee80211_vif_is_mesh(&sdata->vif))
 896                         ieee80211_mesh_init_sdata(sdata);
 897                 break;
 898         case NL80211_IFTYPE_MONITOR:
 899                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
 900                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
 901                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
 902                                       MONITOR_FLAG_OTHER_BSS;
 903                 break;
 904         case NL80211_IFTYPE_WDS:
 905         case NL80211_IFTYPE_AP_VLAN:
 906                 break;
 907         case NL80211_IFTYPE_UNSPECIFIED:
 908         case NUM_NL80211_IFTYPES:
 909                 BUG();
 910                 break;
 911         }
 912
 913         ieee80211_debugfs_add_netdev(sdata);
 914 }
 915
 916 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
 917                                            enum nl80211_iftype type)
 918 {
 919         struct ieee80211_local *local = sdata->local;
 920         int ret, err;
 921         enum nl80211_iftype internal_type = type;
 922         bool p2p = false;
 923
 924         ASSERT_RTNL();
 925
 926         if (!local->ops->change_interface)
 927                 return -EBUSY;
 928
 929         switch (sdata->vif.type) {
 930         case NL80211_IFTYPE_AP:
 931         case NL80211_IFTYPE_STATION:
 932         case NL80211_IFTYPE_ADHOC:
 933                 /*
 934                  * Could maybe also all others here?
 935                  * Just not sure how that interacts
 936                  * with the RX/config path e.g. for
 937                  * mesh.
 938                  */
 939                 break;
 940         default:
 941                 return -EBUSY;
 942         }
 943
 944         switch (type) {
 945         case NL80211_IFTYPE_AP:
 946         case NL80211_IFTYPE_STATION:
 947         case NL80211_IFTYPE_ADHOC:
 948                 /*
 949                  * Could probably support everything
 950                  * but WDS here (WDS do_open can fail
 951                  * under memory pressure, which this
 952                  * code isn't prepared to handle).
 953                  */
 954                 break;
 955         case NL80211_IFTYPE_P2P_CLIENT:
 956                 p2p = true;
 957                 internal_type = NL80211_IFTYPE_STATION;
 958                 break;
 959         case NL80211_IFTYPE_P2P_GO:
 960                 p2p = true;
 961                 internal_type = NL80211_IFTYPE_AP;
 962                 break;
 963         default:
 964                 return -EBUSY;
 965         }
 966
 967         ret = ieee80211_check_concurrent_iface(sdata, internal_type);
 968         if (ret)
 969                 return ret;
 970
 971         ieee80211_do_stop(sdata, false);
 972
 973         ieee80211_teardown_sdata(sdata->dev);
 974
 975         ret = drv_change_interface(local, sdata, internal_type, p2p);
 976         if (ret)
 977                 type = sdata->vif.type;
 978
 979         ieee80211_setup_sdata(sdata, type);
 980
 981         err = ieee80211_do_open(sdata->dev, false);
 982         WARN(err, "type change: do_open returned %d", err);
 983
 984         return ret;
 985 }
 986
 987 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
 988                              enum nl80211_iftype type)
 989 {
 990         int ret;
 991
 992         ASSERT_RTNL();
 993
 994         if (type == ieee80211_vif_type_p2p(&sdata->vif))
 995                 return 0;
 996
 997         /* Setting ad-hoc mode on non-IBSS channel is not supported. */
 998         if (sdata->local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS &&
 999             type == NL80211_IFTYPE_ADHOC)
1000                 return -EOPNOTSUPP;
1001
1002         if (ieee80211_sdata_running(sdata)) {
1003                 ret = ieee80211_runtime_change_iftype(sdata, type);
1004                 if (ret)
1005                         return ret;
1006         } else {
1007                 /* Purge and reset type-dependent state. */
1008                 ieee80211_teardown_sdata(sdata->dev);
1009                 ieee80211_setup_sdata(sdata, type);
1010         }
1011
1012         /* reset some values that shouldn't be kept across type changes */
1013         sdata->vif.bss_conf.basic_rates =
1014                 ieee80211_mandatory_rates(sdata->local,
1015                         sdata->local->hw.conf.channel->band);
1016         sdata->drop_unencrypted = 0;
1017         if (type == NL80211_IFTYPE_STATION)
1018                 sdata->u.mgd.use_4addr = false;
1019
1020         return 0;
1021 }
1022
1023 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1024                                        struct net_device *dev,
1025                                        enum nl80211_iftype type)
1026 {
1027         struct ieee80211_sub_if_data *sdata;
1028         u64 mask, start, addr, val, inc;
1029         u8 *m;
1030         u8 tmp_addr[ETH_ALEN];
1031         int i;
1032
1033         /* default ... something at least */
1034         memcpy(dev->perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1035
1036         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1037             local->hw.wiphy->n_addresses <= 1)
1038                 return;
1039
1040
1041         mutex_lock(&local->iflist_mtx);
1042
1043         switch (type) {
1044         case NL80211_IFTYPE_MONITOR:
1045                 /* doesn't matter */
1046                 break;
1047         case NL80211_IFTYPE_WDS:
1048         case NL80211_IFTYPE_AP_VLAN:
1049                 /* match up with an AP interface */
1050                 list_for_each_entry(sdata, &local->interfaces, list) {
1051                         if (sdata->vif.type != NL80211_IFTYPE_AP)
1052                                 continue;
1053                         memcpy(dev->perm_addr, sdata->vif.addr, ETH_ALEN);
1054                         break;
1055                 }
1056                 /* keep default if no AP interface present */
1057                 break;
1058         default:
1059                 /* assign a new address if possible -- try n_addresses first */
1060                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1061                         bool used = false;
1062
1063                         list_for_each_entry(sdata, &local->interfaces, list) {
1064                                 if (memcmp(local->hw.wiphy->addresses[i].addr,
1065                                            sdata->vif.addr, ETH_ALEN) == 0) {
1066                                         used = true;
1067                                         break;
1068                                 }
1069                         }
1070
1071                         if (!used) {
1072                                 memcpy(dev->perm_addr,
1073                                        local->hw.wiphy->addresses[i].addr,
1074                                        ETH_ALEN);
1075                                 break;
1076                         }
1077                 }
1078
1079                 /* try mask if available */
1080                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1081                         break;
1082
1083                 m = local->hw.wiphy->addr_mask;
1084                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1085                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1086                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1087
1088                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1089                         /* not a contiguous mask ... not handled now! */
1090                         printk(KERN_DEBUG "not contiguous\n");
1091                         break;
1092                 }
1093
1094                 m = local->hw.wiphy->perm_addr;
1095                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1096                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1097                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1098
1099                 inc = 1ULL<<__ffs64(mask);
1100                 val = (start & mask);
1101                 addr = (start & ~mask) | (val & mask);
1102                 do {
1103                         bool used = false;
1104
1105                         tmp_addr[5] = addr >> 0*8;
1106                         tmp_addr[4] = addr >> 1*8;
1107                         tmp_addr[3] = addr >> 2*8;
1108                         tmp_addr[2] = addr >> 3*8;
1109                         tmp_addr[1] = addr >> 4*8;
1110                         tmp_addr[0] = addr >> 5*8;
1111
1112                         val += inc;
1113
1114                         list_for_each_entry(sdata, &local->interfaces, list) {
1115                                 if (memcmp(tmp_addr, sdata->vif.addr,
1116                                                         ETH_ALEN) == 0) {
1117                                         used = true;
1118                                         break;
1119                                 }
1120                         }
1121
1122                         if (!used) {
1123                                 memcpy(dev->perm_addr, tmp_addr, ETH_ALEN);
1124                                 break;
1125                         }
1126                         addr = (start & ~mask) | (val & mask);
1127                 } while (addr != start);
1128
1129                 break;
1130         }
1131
1132         mutex_unlock(&local->iflist_mtx);
1133 }
1134
1135 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1136                      struct net_device **new_dev, enum nl80211_iftype type,
1137                      struct vif_params *params)
1138 {
1139         struct net_device *ndev;
1140         struct ieee80211_sub_if_data *sdata = NULL;
1141         int ret, i;
1142
1143         ASSERT_RTNL();
1144
1145         ndev = alloc_netdev_mq(sizeof(*sdata) + local->hw.vif_data_size,
1146                                name, ieee80211_if_setup, local->hw.queues);
1147         if (!ndev)
1148                 return -ENOMEM;
1149         dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1150
1151         ndev->needed_headroom = local->tx_headroom +
1152                                 4*6 /* four MAC addresses */
1153                                 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1154                                 + 6 /* mesh */
1155                                 + 8 /* rfc1042/bridge tunnel */
1156                                 - ETH_HLEN /* ethernet hard_header_len */
1157                                 + IEEE80211_ENCRYPT_HEADROOM;
1158         ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1159
1160         ret = dev_alloc_name(ndev, ndev->name);
1161         if (ret < 0)
1162                 goto fail;
1163
1164         ieee80211_assign_perm_addr(local, ndev, type);
1165         memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1166         SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1167
1168         /* don't use IEEE80211_DEV_TO_SUB_IF because it checks too much */
1169         sdata = netdev_priv(ndev);
1170         ndev->ieee80211_ptr = &sdata->wdev;
1171         memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1172         memcpy(sdata->name, ndev->name, IFNAMSIZ);
1173
1174         /* initialise type-independent data */
1175         sdata->wdev.wiphy = local->hw.wiphy;
1176         sdata->local = local;
1177         sdata->dev = ndev;
1178 #ifdef CONFIG_INET
1179         sdata->arp_filter_state = true;
1180 #endif
1181
1182         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1183                 skb_queue_head_init(&sdata->fragments[i].skb_list);
1184
1185         INIT_LIST_HEAD(&sdata->key_list);
1186
1187         for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1188                 struct ieee80211_supported_band *sband;
1189                 sband = local->hw.wiphy->bands[i];
1190                 sdata->rc_rateidx_mask[i] =
1191                         sband ? (1 << sband->n_bitrates) - 1 : 0;
1192         }
1193
1194         /* setup type-dependent data */
1195         ieee80211_setup_sdata(sdata, type);
1196
1197         if (params) {
1198                 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1199                 if (type == NL80211_IFTYPE_STATION)
1200                         sdata->u.mgd.use_4addr = params->use_4addr;
1201         }
1202
1203         ret = register_netdevice(ndev);
1204         if (ret)
1205                 goto fail;
1206
1207         if (ieee80211_vif_is_mesh(&sdata->vif) &&
1208             params && params->mesh_id_len)
1209                 ieee80211_sdata_set_mesh_id(sdata,
1210                                             params->mesh_id_len,
1211                                             params->mesh_id);
1212
1213         mutex_lock(&local->iflist_mtx);
1214         list_add_tail_rcu(&sdata->list, &local->interfaces);
1215         mutex_unlock(&local->iflist_mtx);
1216
1217         if (new_dev)
1218                 *new_dev = ndev;
1219
1220         return 0;
1221
1222  fail:
1223         free_netdev(ndev);
1224         return ret;
1225 }
1226
1227 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1228 {
1229         ASSERT_RTNL();
1230
1231         mutex_lock(&sdata->local->iflist_mtx);
1232         list_del_rcu(&sdata->list);
1233         mutex_unlock(&sdata->local->iflist_mtx);
1234
1235         synchronize_rcu();
1236         unregister_netdevice(sdata->dev);
1237 }
1238
1239 /*
1240  * Remove all interfaces, may only be called at hardware unregistration
1241  * time because it doesn't do RCU-safe list removals.
1242  */
1243 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1244 {
1245         struct ieee80211_sub_if_data *sdata, *tmp;
1246         LIST_HEAD(unreg_list);
1247
1248         ASSERT_RTNL();
1249
1250         mutex_lock(&local->iflist_mtx);
1251         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1252                 list_del(&sdata->list);
1253
1254                 unregister_netdevice_queue(sdata->dev, &unreg_list);
1255         }
1256         mutex_unlock(&local->iflist_mtx);
1257         unregister_netdevice_many(&unreg_list);
1258 }
1259
1260 static u32 ieee80211_idle_off(struct ieee80211_local *local,
1261                               const char *reason)
1262 {
1263         if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
1264                 return 0;
1265
1266 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1267         wiphy_debug(local->hw.wiphy, "device no longer idle - %s\n", reason);
1268 #endif
1269
1270         local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
1271         return IEEE80211_CONF_CHANGE_IDLE;
1272 }
1273
1274 static u32 ieee80211_idle_on(struct ieee80211_local *local)
1275 {
1276         if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
1277                 return 0;
1278
1279 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1280         wiphy_debug(local->hw.wiphy, "device now idle\n");
1281 #endif
1282
1283         drv_flush(local, false);
1284
1285         local->hw.conf.flags |= IEEE80211_CONF_IDLE;
1286         return IEEE80211_CONF_CHANGE_IDLE;
1287 }
1288
1289 u32 __ieee80211_recalc_idle(struct ieee80211_local *local)
1290 {
1291         struct ieee80211_sub_if_data *sdata;
1292         int count = 0;
1293         bool working = false, scanning = false;
1294         struct ieee80211_work *wk;
1295
1296 #ifdef CONFIG_PROVE_LOCKING
1297         WARN_ON(debug_locks && !lockdep_rtnl_is_held() &&
1298                 !lockdep_is_held(&local->iflist_mtx));
1299 #endif
1300         lockdep_assert_held(&local->mtx);
1301
1302         list_for_each_entry(sdata, &local->interfaces, list) {
1303                 if (!ieee80211_sdata_running(sdata)) {
1304                         sdata->vif.bss_conf.idle = true;
1305                         continue;
1306                 }
1307
1308                 sdata->old_idle = sdata->vif.bss_conf.idle;
1309
1310                 /* do not count disabled managed interfaces */
1311                 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1312                     !sdata->u.mgd.associated) {
1313                         sdata->vif.bss_conf.idle = true;
1314                         continue;
1315                 }
1316                 /* do not count unused IBSS interfaces */
1317                 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
1318                     !sdata->u.ibss.ssid_len) {
1319                         sdata->vif.bss_conf.idle = true;
1320                         continue;
1321                 }
1322                 /* count everything else */
1323                 count++;
1324         }
1325
1326         list_for_each_entry(wk, &local->work_list, list) {
1327                 working = true;
1328                 wk->sdata->vif.bss_conf.idle = false;
1329         }
1330
1331         if (local->scan_sdata) {
1332                 scanning = true;
1333                 local->scan_sdata->vif.bss_conf.idle = false;
1334         }
1335
1336         list_for_each_entry(sdata, &local->interfaces, list) {
1337                 if (sdata->old_idle == sdata->vif.bss_conf.idle)
1338                         continue;
1339                 if (!ieee80211_sdata_running(sdata))
1340                         continue;
1341                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_IDLE);
1342         }
1343
1344         if (working)
1345                 return ieee80211_idle_off(local, "working");
1346         if (scanning)
1347                 return ieee80211_idle_off(local, "scanning");
1348         if (!count)
1349                 return ieee80211_idle_on(local);
1350         else
1351                 return ieee80211_idle_off(local, "in use");
1352
1353         return 0;
1354 }
1355
1356 void ieee80211_recalc_idle(struct ieee80211_local *local)
1357 {
1358         u32 chg;
1359
1360         mutex_lock(&local->iflist_mtx);
1361         chg = __ieee80211_recalc_idle(local);
1362         mutex_unlock(&local->iflist_mtx);
1363         if (chg)
1364                 ieee80211_hw_config(local, chg);
1365 }
1366
1367 static int netdev_notify(struct notifier_block *nb,
1368                          unsigned long state,
1369                          void *ndev)
1370 {
1371         struct net_device *dev = ndev;
1372         struct ieee80211_sub_if_data *sdata;
1373
1374         if (state != NETDEV_CHANGENAME)
1375                 return 0;
1376
1377         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1378                 return 0;
1379
1380         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1381                 return 0;
1382
1383         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1384
1385         memcpy(sdata->name, dev->name, IFNAMSIZ);
1386
1387         ieee80211_debugfs_rename_netdev(sdata);
1388         return 0;
1389 }
1390
1391 static struct notifier_block mac80211_netdev_notifier = {
1392         .notifier_call = netdev_notify,
1393 };
1394
1395 int ieee80211_iface_init(void)
1396 {
1397         return register_netdevice_notifier(&mac80211_netdev_notifier);
1398 }
1399
1400 void ieee80211_iface_exit(void)
1401 {
1402         unregister_netdevice_notifier(&mac80211_netdev_notifier);
1403 }