net/mac80211/iface.c

   1 /*
   2  * Interface handling (except master interface)
   3  *
   4  * Copyright 2002-2005, Instant802 Networks, Inc.
   5  * Copyright 2005-2006, Devicescape Software, Inc.
   6  * Copyright (c) 2006 Jiri Benc <jbenc@suse.cz>
   7  * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13 #include <linux/slab.h>
  14 #include <linux/kernel.h>
  15 #include <linux/if_arp.h>
  16 #include <linux/netdevice.h>
  17 #include <linux/rtnetlink.h>
  18 #include <net/mac80211.h>
  19 #include <net/ieee80211_radiotap.h>
  20 #include "ieee80211_i.h"
  21 #include "sta_info.h"
  22 #include "debugfs_netdev.h"
  23 #include "mesh.h"
  24 #include "led.h"
  25 #include "driver-ops.h"
  26 #include "wme.h"
  27 #include "rate.h"
  28
  29 /**
  30  * DOC: Interface list locking
  31  *
  32  * The interface list in each struct ieee80211_local is protected
  33  * three-fold:
  34  *
  35  * (1) modifications may only be done under the RTNL
  36  * (2) modifications and readers are protected against each other by
  37  *     the iflist_mtx.
  38  * (3) modifications are done in an RCU manner so atomic readers
  39  *     can traverse the list in RCU-safe blocks.
  40  *
  41  * As a consequence, reads (traversals) of the list can be protected
  42  * by either the RTNL, the iflist_mtx or RCU.
  43  */
  44
  45
  46 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
  47 {
  48         int meshhdrlen;
  49         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
  50
  51         meshhdrlen = (sdata->vif.type == NL80211_IFTYPE_MESH_POINT) ? 5 : 0;
  52
  53         /* FIX: what would be proper limits for MTU?
  54          * This interface uses 802.3 frames. */
  55         if (new_mtu < 256 ||
  56             new_mtu > IEEE80211_MAX_DATA_LEN - 24 - 6 - meshhdrlen) {
  57                 return -EINVAL;
  58         }
  59
  60 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
  61         printk(KERN_DEBUG "%s: setting MTU %d\n", dev->name, new_mtu);
  62 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
  63         dev->mtu = new_mtu;
  64         return 0;
  65 }
  66
  67 static int ieee80211_change_mac(struct net_device *dev, void *addr)
  68 {
  69         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
  70         struct sockaddr *sa = addr;
  71         int ret;
  72
  73         if (ieee80211_sdata_running(sdata))
  74                 return -EBUSY;
  75
  76         ret = eth_mac_addr(dev, sa);
  77
  78         if (ret == 0)
  79                 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
  80
  81         return ret;
  82 }
  83
  84 static inline int identical_mac_addr_allowed(int type1, int type2)
  85 {
  86         return type1 == NL80211_IFTYPE_MONITOR ||
  87                 type2 == NL80211_IFTYPE_MONITOR ||
  88                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
  89                 (type1 == NL80211_IFTYPE_WDS &&
  90                         (type2 == NL80211_IFTYPE_WDS ||
  91                          type2 == NL80211_IFTYPE_AP)) ||
  92                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
  93                 (type1 == NL80211_IFTYPE_AP_VLAN &&
  94                         (type2 == NL80211_IFTYPE_AP ||
  95                          type2 == NL80211_IFTYPE_AP_VLAN));
  96 }
  97
  98 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
  99                                             enum nl80211_iftype iftype)
 100 {
 101         struct ieee80211_local *local = sdata->local;
 102         struct ieee80211_sub_if_data *nsdata;
 103         struct net_device *dev = sdata->dev;
 104
 105         ASSERT_RTNL();
 106
 107         /* we hold the RTNL here so can safely walk the list */
 108         list_for_each_entry(nsdata, &local->interfaces, list) {
 109                 struct net_device *ndev = nsdata->dev;
 110
 111                 if (ndev != dev && ieee80211_sdata_running(nsdata)) {
 112                         /*
 113                          * Allow only a single IBSS interface to be up at any
 114                          * time. This is restricted because beacon distribution
 115                          * cannot work properly if both are in the same IBSS.
 116                          *
 117                          * To remove this restriction we'd have to disallow them
 118                          * from setting the same SSID on different IBSS interfaces
 119                          * belonging to the same hardware. Then, however, we're
 120                          * faced with having to adopt two different TSF timers...
 121                          */
 122                         if (iftype == NL80211_IFTYPE_ADHOC &&
 123                             nsdata->vif.type == NL80211_IFTYPE_ADHOC)
 124                                 return -EBUSY;
 125
 126                         /*
 127                          * The remaining checks are only performed for interfaces
 128                          * with the same MAC address.
 129                          */
 130                         if (compare_ether_addr(dev->dev_addr, ndev->dev_addr))
 131                                 continue;
 132
 133                         /*
 134                          * check whether it may have the same address
 135                          */
 136                         if (!identical_mac_addr_allowed(iftype,
 137                                                         nsdata->vif.type))
 138                                 return -ENOTUNIQ;
 139
 140                         /*
 141                          * can only add VLANs to enabled APs
 142                          */
 143                         if (iftype == NL80211_IFTYPE_AP_VLAN &&
 144                             nsdata->vif.type == NL80211_IFTYPE_AP)
 145                                 sdata->bss = &nsdata->u.ap;
 146                 }
 147         }
 148
 149         return 0;
 150 }
 151
 152 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
 153                                     const int offset)
 154 {
 155         struct ieee80211_local *local = sdata->local;
 156         u32 flags = sdata->u.mntr_flags;
 157
 158 #define ADJUST(_f, _s)  do {                                    \
 159         if (flags & MONITOR_FLAG_##_f)                          \
 160                 local->fif_##_s += offset;                      \
 161         } while (0)
 162
 163         ADJUST(FCSFAIL, fcsfail);
 164         ADJUST(PLCPFAIL, plcpfail);
 165         ADJUST(CONTROL, control);
 166         ADJUST(CONTROL, pspoll);
 167         ADJUST(OTHER_BSS, other_bss);
 168
 169 #undef ADJUST
 170 }
 171
 172 /*
 173  * NOTE: Be very careful when changing this function, it must NOT return
 174  * an error on interface type changes that have been pre-checked, so most
 175  * checks should be in ieee80211_check_concurrent_iface.
 176  */
 177 static int ieee80211_do_open(struct net_device *dev, bool coming_up)
 178 {
 179         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 180         struct ieee80211_local *local = sdata->local;
 181         struct sta_info *sta;
 182         u32 changed = 0;
 183         int res;
 184         u32 hw_reconf_flags = 0;
 185
 186         switch (sdata->vif.type) {
 187         case NL80211_IFTYPE_WDS:
 188                 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
 189                         return -ENOLINK;
 190                 break;
 191         case NL80211_IFTYPE_AP_VLAN:
 192                 if (!sdata->bss)
 193                         return -ENOLINK;
 194                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
 195                 break;
 196         case NL80211_IFTYPE_AP:
 197                 sdata->bss = &sdata->u.ap;
 198                 break;
 199         case NL80211_IFTYPE_MESH_POINT:
 200         case NL80211_IFTYPE_STATION:
 201         case NL80211_IFTYPE_MONITOR:
 202         case NL80211_IFTYPE_ADHOC:
 203                 /* no special treatment */
 204                 break;
 205         case NL80211_IFTYPE_UNSPECIFIED:
 206         case NUM_NL80211_IFTYPES:
 207         case NL80211_IFTYPE_P2P_CLIENT:
 208         case NL80211_IFTYPE_P2P_GO:
 209                 /* cannot happen */
 210                 WARN_ON(1);
 211                 break;
 212         }
 213
 214         if (local->open_count == 0) {
 215                 res = drv_start(local);
 216                 if (res)
 217                         goto err_del_bss;
 218                 if (local->ops->napi_poll)
 219                         napi_enable(&local->napi);
 220                 /* we're brought up, everything changes */
 221                 hw_reconf_flags = ~0;
 222                 ieee80211_led_radio(local, true);
 223                 ieee80211_mod_tpt_led_trig(local,
 224                                            IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
 225         }
 226
 227         /*
 228          * Copy the hopefully now-present MAC address to
 229          * this interface, if it has the special null one.
 230          */
 231         if (is_zero_ether_addr(dev->dev_addr)) {
 232                 memcpy(dev->dev_addr,
 233                        local->hw.wiphy->perm_addr,
 234                        ETH_ALEN);
 235                 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
 236
 237                 if (!is_valid_ether_addr(dev->dev_addr)) {
 238                         if (!local->open_count)
 239                                 drv_stop(local);
 240                         return -EADDRNOTAVAIL;
 241                 }
 242         }
 243
 244         switch (sdata->vif.type) {
 245         case NL80211_IFTYPE_AP_VLAN:
 246                 /* no need to tell driver */
 247                 break;
 248         case NL80211_IFTYPE_MONITOR:
 249                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 250                         local->cooked_mntrs++;
 251                         break;
 252                 }
 253
 254                 /* must be before the call to ieee80211_configure_filter */
 255                 local->monitors++;
 256                 if (local->monitors == 1) {
 257                         local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
 258                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 259                 }
 260
 261                 ieee80211_adjust_monitor_flags(sdata, 1);
 262                 ieee80211_configure_filter(local);
 263
 264                 netif_carrier_on(dev);
 265                 break;
 266         default:
 267                 if (coming_up) {
 268                         res = drv_add_interface(local, &sdata->vif);
 269                         if (res)
 270                                 goto err_stop;
 271                 }
 272
 273                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
 274                         local->fif_pspoll++;
 275                         local->fif_probe_req++;
 276
 277                         ieee80211_configure_filter(local);
 278                 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 279                         local->fif_probe_req++;
 280                 }
 281
 282                 changed |= ieee80211_reset_erp_info(sdata);
 283                 ieee80211_bss_info_change_notify(sdata, changed);
 284
 285                 if (sdata->vif.type == NL80211_IFTYPE_STATION)
 286                         netif_carrier_off(dev);
 287                 else
 288                         netif_carrier_on(dev);
 289         }
 290
 291         set_bit(SDATA_STATE_RUNNING, &sdata->state);
 292
 293         if (sdata->vif.type == NL80211_IFTYPE_WDS) {
 294                 /* Create STA entry for the WDS peer */
 295                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
 296                                      GFP_KERNEL);
 297                 if (!sta) {
 298                         res = -ENOMEM;
 299                         goto err_del_interface;
 300                 }
 301
 302                 /* no locking required since STA is not live yet */
 303                 sta->flags |= WLAN_STA_AUTHORIZED;
 304
 305                 res = sta_info_insert(sta);
 306                 if (res) {
 307                         /* STA has been freed */
 308                         goto err_del_interface;
 309                 }
 310
 311                 rate_control_rate_init(sta);
 312         }
 313
 314         /*
 315          * set_multicast_list will be invoked by the networking core
 316          * which will check whether any increments here were done in
 317          * error and sync them down to the hardware as filter flags.
 318          */
 319         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 320                 atomic_inc(&local->iff_allmultis);
 321
 322         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 323                 atomic_inc(&local->iff_promiscs);
 324
 325         mutex_lock(&local->mtx);
 326         hw_reconf_flags |= __ieee80211_recalc_idle(local);
 327         mutex_unlock(&local->mtx);
 328
 329         if (coming_up)
 330                 local->open_count++;
 331
 332         if (hw_reconf_flags) {
 333                 ieee80211_hw_config(local, hw_reconf_flags);
 334                 /*
 335                  * set default queue parameters so drivers don't
 336                  * need to initialise the hardware if the hardware
 337                  * doesn't start up with sane defaults
 338                  */
 339                 ieee80211_set_wmm_default(sdata);
 340         }
 341
 342         ieee80211_recalc_ps(local, -1);
 343
 344         netif_tx_start_all_queues(dev);
 345
 346         return 0;
 347  err_del_interface:
 348         drv_remove_interface(local, &sdata->vif);
 349  err_stop:
 350         if (!local->open_count)
 351                 drv_stop(local);
 352  err_del_bss:
 353         sdata->bss = NULL;
 354         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
 355                 list_del(&sdata->u.vlan.list);
 356         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 357         return res;
 358 }
 359
 360 static int ieee80211_open(struct net_device *dev)
 361 {
 362         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 363         int err;
 364
 365         /* fail early if user set an invalid address */
 366         if (!is_valid_ether_addr(dev->dev_addr))
 367                 return -EADDRNOTAVAIL;
 368
 369         err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
 370         if (err)
 371                 return err;
 372
 373         return ieee80211_do_open(dev, true);
 374 }
 375
 376 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
 377                               bool going_down)
 378 {
 379         struct ieee80211_local *local = sdata->local;
 380         unsigned long flags;
 381         struct sk_buff *skb, *tmp;
 382         u32 hw_reconf_flags = 0;
 383         int i;
 384         enum nl80211_channel_type orig_ct;
 385
 386         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 387
 388         if (local->scan_sdata == sdata)
 389                 ieee80211_scan_cancel(local);
 390
 391         /*
 392          * Stop TX on this interface first.
 393          */
 394         netif_tx_stop_all_queues(sdata->dev);
 395
 396         /*
 397          * Purge work for this interface.
 398          */
 399         ieee80211_work_purge(sdata);
 400
 401         /*
 402          * Remove all stations associated with this interface.
 403          *
 404          * This must be done before calling ops->remove_interface()
 405          * because otherwise we can later invoke ops->sta_notify()
 406          * whenever the STAs are removed, and that invalidates driver
 407          * assumptions about always getting a vif pointer that is valid
 408          * (because if we remove a STA after ops->remove_interface()
 409          * the driver will have removed the vif info already!)
 410          *
 411          * This is relevant only in AP, WDS and mesh modes, since in
 412          * all other modes we've already removed all stations when
 413          * disconnecting etc.
 414          */
 415         sta_info_flush(local, sdata);
 416
 417         /*
 418          * Don't count this interface for promisc/allmulti while it
 419          * is down. dev_mc_unsync() will invoke set_multicast_list
 420          * on the master interface which will sync these down to the
 421          * hardware as filter flags.
 422          */
 423         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 424                 atomic_dec(&local->iff_allmultis);
 425
 426         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 427                 atomic_dec(&local->iff_promiscs);
 428
 429         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 430                 local->fif_pspoll--;
 431                 local->fif_probe_req--;
 432         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 433                 local->fif_probe_req--;
 434         }
 435
 436         netif_addr_lock_bh(sdata->dev);
 437         spin_lock_bh(&local->filter_lock);
 438         __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
 439                          sdata->dev->addr_len);
 440         spin_unlock_bh(&local->filter_lock);
 441         netif_addr_unlock_bh(sdata->dev);
 442
 443         ieee80211_configure_filter(local);
 444
 445         del_timer_sync(&local->dynamic_ps_timer);
 446         cancel_work_sync(&local->dynamic_ps_enable_work);
 447
 448         /* APs need special treatment */
 449         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 450                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
 451                 struct beacon_data *old_beacon =
 452                         rtnl_dereference(sdata->u.ap.beacon);
 453
 454                 /* sdata_running will return false, so this will disable */
 455                 ieee80211_bss_info_change_notify(sdata,
 456                                                  BSS_CHANGED_BEACON_ENABLED);
 457
 458                 /* remove beacon */
 459                 RCU_INIT_POINTER(sdata->u.ap.beacon, NULL);
 460                 synchronize_rcu();
 461                 kfree(old_beacon);
 462
 463                 /* down all dependent devices, that is VLANs */
 464                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
 465                                          u.vlan.list)
 466                         dev_close(vlan->dev);
 467                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
 468
 469                 /* free all potentially still buffered bcast frames */
 470                 local->total_ps_buffered -= skb_queue_len(&sdata->u.ap.ps_bc_buf);
 471                 skb_queue_purge(&sdata->u.ap.ps_bc_buf);
 472         }
 473
 474         if (going_down)
 475                 local->open_count--;
 476
 477         switch (sdata->vif.type) {
 478         case NL80211_IFTYPE_AP_VLAN:
 479                 list_del(&sdata->u.vlan.list);
 480                 /* no need to tell driver */
 481                 break;
 482         case NL80211_IFTYPE_MONITOR:
 483                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 484                         local->cooked_mntrs--;
 485                         break;
 486                 }
 487
 488                 local->monitors--;
 489                 if (local->monitors == 0) {
 490                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
 491                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 492                 }
 493
 494                 ieee80211_adjust_monitor_flags(sdata, -1);
 495                 ieee80211_configure_filter(local);
 496                 break;
 497         default:
 498                 flush_work(&sdata->work);
 499                 /*
 500                  * When we get here, the interface is marked down.
 501                  * Call synchronize_rcu() to wait for the RX path
 502                  * should it be using the interface and enqueuing
 503                  * frames at this very time on another CPU.
 504                  */
 505                 synchronize_rcu();
 506                 skb_queue_purge(&sdata->skb_queue);
 507
 508                 /*
 509                  * Disable beaconing here for mesh only, AP and IBSS
 510                  * are already taken care of.
 511                  */
 512                 if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
 513                         ieee80211_bss_info_change_notify(sdata,
 514                                 BSS_CHANGED_BEACON_ENABLED);
 515
 516                 /*
 517                  * Free all remaining keys, there shouldn't be any,
 518                  * except maybe group keys in AP more or WDS?
 519                  */
 520                 ieee80211_free_keys(sdata);
 521
 522                 if (going_down)
 523                         drv_remove_interface(local, &sdata->vif);
 524         }
 525
 526         sdata->bss = NULL;
 527
 528         mutex_lock(&local->mtx);
 529         hw_reconf_flags |= __ieee80211_recalc_idle(local);
 530         mutex_unlock(&local->mtx);
 531
 532         ieee80211_recalc_ps(local, -1);
 533
 534         if (local->open_count == 0) {
 535                 if (local->ops->napi_poll)
 536                         napi_disable(&local->napi);
 537                 ieee80211_clear_tx_pending(local);
 538                 ieee80211_stop_device(local);
 539
 540                 /* no reconfiguring after stop! */
 541                 hw_reconf_flags = 0;
 542         }
 543
 544         /* Re-calculate channel-type, in case there are multiple vifs
 545          * on different channel types.
 546          */
 547         orig_ct = local->_oper_channel_type;
 548         ieee80211_set_channel_type(local, NULL, NL80211_CHAN_NO_HT);
 549
 550         /* do after stop to avoid reconfiguring when we stop anyway */
 551         if (hw_reconf_flags || (orig_ct != local->_oper_channel_type))
 552                 ieee80211_hw_config(local, hw_reconf_flags);
 553
 554         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 555         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 556                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
 557                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 558                         if (info->control.vif == &sdata->vif) {
 559                                 __skb_unlink(skb, &local->pending[i]);
 560                                 dev_kfree_skb_irq(skb);
 561                         }
 562                 }
 563         }
 564         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 565 }
 566
 567 static int ieee80211_stop(struct net_device *dev)
 568 {
 569         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 570
 571         ieee80211_do_stop(sdata, true);
 572
 573         return 0;
 574 }
 575
 576 static void ieee80211_set_multicast_list(struct net_device *dev)
 577 {
 578         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 579         struct ieee80211_local *local = sdata->local;
 580         int allmulti, promisc, sdata_allmulti, sdata_promisc;
 581
 582         allmulti = !!(dev->flags & IFF_ALLMULTI);
 583         promisc = !!(dev->flags & IFF_PROMISC);
 584         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
 585         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
 586
 587         if (allmulti != sdata_allmulti) {
 588                 if (dev->flags & IFF_ALLMULTI)
 589                         atomic_inc(&local->iff_allmultis);
 590                 else
 591                         atomic_dec(&local->iff_allmultis);
 592                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
 593         }
 594
 595         if (promisc != sdata_promisc) {
 596                 if (dev->flags & IFF_PROMISC)
 597                         atomic_inc(&local->iff_promiscs);
 598                 else
 599                         atomic_dec(&local->iff_promiscs);
 600                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
 601         }
 602         spin_lock_bh(&local->filter_lock);
 603         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
 604         spin_unlock_bh(&local->filter_lock);
 605         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
 606 }
 607
 608 /*
 609  * Called when the netdev is removed or, by the code below, before
 610  * the interface type changes.
 611  */
 612 static void ieee80211_teardown_sdata(struct net_device *dev)
 613 {
 614         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 615         struct ieee80211_local *local = sdata->local;
 616         int flushed;
 617         int i;
 618
 619         /* free extra data */
 620         ieee80211_free_keys(sdata);
 621
 622         ieee80211_debugfs_remove_netdev(sdata);
 623
 624         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
 625                 __skb_queue_purge(&sdata->fragments[i].skb_list);
 626         sdata->fragment_next = 0;
 627
 628         if (ieee80211_vif_is_mesh(&sdata->vif))
 629                 mesh_rmc_free(sdata);
 630
 631         flushed = sta_info_flush(local, sdata);
 632         WARN_ON(flushed);
 633 }
 634
 635 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
 636                                          struct sk_buff *skb)
 637 {
 638         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
 639 }
 640
 641 static const struct net_device_ops ieee80211_dataif_ops = {
 642         .ndo_open               = ieee80211_open,
 643         .ndo_stop               = ieee80211_stop,
 644         .ndo_uninit             = ieee80211_teardown_sdata,
 645         .ndo_start_xmit         = ieee80211_subif_start_xmit,
 646         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
 647         .ndo_change_mtu         = ieee80211_change_mtu,
 648         .ndo_set_mac_address    = ieee80211_change_mac,
 649         .ndo_select_queue       = ieee80211_netdev_select_queue,
 650 };
 651
 652 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
 653                                           struct sk_buff *skb)
 654 {
 655         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 656         struct ieee80211_local *local = sdata->local;
 657         struct ieee80211_hdr *hdr;
 658         struct ieee80211_radiotap_header *rtap = (void *)skb->data;
 659         u8 *p;
 660
 661         if (local->hw.queues < 4)
 662                 return 0;
 663
 664         if (skb->len < 4 ||
 665             skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
 666                 return 0; /* doesn't matter, frame will be dropped */
 667
 668         hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
 669
 670         if (!ieee80211_is_data(hdr->frame_control)) {
 671                 skb->priority = 7;
 672                 return ieee802_1d_to_ac[skb->priority];
 673         }
 674         if (!ieee80211_is_data_qos(hdr->frame_control)) {
 675                 skb->priority = 0;
 676                 return ieee802_1d_to_ac[skb->priority];
 677         }
 678
 679         p = ieee80211_get_qos_ctl(hdr);
 680         skb->priority = *p & IEEE80211_QOS_CTL_TAG1D_MASK;
 681
 682         return ieee80211_downgrade_queue(local, skb);
 683 }
 684
 685 static const struct net_device_ops ieee80211_monitorif_ops = {
 686         .ndo_open               = ieee80211_open,
 687         .ndo_stop               = ieee80211_stop,
 688         .ndo_uninit             = ieee80211_teardown_sdata,
 689         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
 690         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
 691         .ndo_change_mtu         = ieee80211_change_mtu,
 692         .ndo_set_mac_address    = eth_mac_addr,
 693         .ndo_select_queue       = ieee80211_monitor_select_queue,
 694 };
 695
 696 static void ieee80211_if_setup(struct net_device *dev)
 697 {
 698         ether_setup(dev);
 699         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
 700         dev->netdev_ops = &ieee80211_dataif_ops;
 701         dev->destructor = free_netdev;
 702 }
 703
 704 static void ieee80211_iface_work(struct work_struct *work)
 705 {
 706         struct ieee80211_sub_if_data *sdata =
 707                 container_of(work, struct ieee80211_sub_if_data, work);
 708         struct ieee80211_local *local = sdata->local;
 709         struct sk_buff *skb;
 710         struct sta_info *sta;
 711         struct ieee80211_ra_tid *ra_tid;
 712
 713         if (!ieee80211_sdata_running(sdata))
 714                 return;
 715
 716         if (local->scanning)
 717                 return;
 718
 719         /*
 720          * ieee80211_queue_work() should have picked up most cases,
 721          * here we'll pick the rest.
 722          */
 723         if (WARN(local->suspended,
 724                  "interface work scheduled while going to suspend\n"))
 725                 return;
 726
 727         /* first process frames */
 728         while ((skb = skb_dequeue(&sdata->skb_queue))) {
 729                 struct ieee80211_mgmt *mgmt = (void *)skb->data;
 730
 731                 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
 732                         ra_tid = (void *)&skb->cb;
 733                         ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
 734                                                  ra_tid->tid);
 735                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
 736                         ra_tid = (void *)&skb->cb;
 737                         ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
 738                                                 ra_tid->tid);
 739                 } else if (ieee80211_is_action(mgmt->frame_control) &&
 740                            mgmt->u.action.category == WLAN_CATEGORY_BACK) {
 741                         int len = skb->len;
 742
 743                         mutex_lock(&local->sta_mtx);
 744                         sta = sta_info_get_bss(sdata, mgmt->sa);
 745                         if (sta) {
 746                                 switch (mgmt->u.action.u.addba_req.action_code) {
 747                                 case WLAN_ACTION_ADDBA_REQ:
 748                                         ieee80211_process_addba_request(
 749                                                         local, sta, mgmt, len);
 750                                         break;
 751                                 case WLAN_ACTION_ADDBA_RESP:
 752                                         ieee80211_process_addba_resp(local, sta,
 753                                                                      mgmt, len);
 754                                         break;
 755                                 case WLAN_ACTION_DELBA:
 756                                         ieee80211_process_delba(sdata, sta,
 757                                                                 mgmt, len);
 758                                         break;
 759                                 default:
 760                                         WARN_ON(1);
 761                                         break;
 762                                 }
 763                         }
 764                         mutex_unlock(&local->sta_mtx);
 765                 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
 766                         struct ieee80211_hdr *hdr = (void *)mgmt;
 767                         /*
 768                          * So the frame isn't mgmt, but frame_control
 769                          * is at the right place anyway, of course, so
 770                          * the if statement is correct.
 771                          *
 772                          * Warn if we have other data frame types here,
 773                          * they must not get here.
 774                          */
 775                         WARN_ON(hdr->frame_control &
 776                                         cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
 777                         WARN_ON(!(hdr->seq_ctrl &
 778                                         cpu_to_le16(IEEE80211_SCTL_FRAG)));
 779                         /*
 780                          * This was a fragment of a frame, received while
 781                          * a block-ack session was active. That cannot be
 782                          * right, so terminate the session.
 783                          */
 784                         mutex_lock(&local->sta_mtx);
 785                         sta = sta_info_get_bss(sdata, mgmt->sa);
 786                         if (sta) {
 787                                 u16 tid = *ieee80211_get_qos_ctl(hdr) &
 788                                                 IEEE80211_QOS_CTL_TID_MASK;
 789
 790                                 __ieee80211_stop_rx_ba_session(
 791                                         sta, tid, WLAN_BACK_RECIPIENT,
 792                                         WLAN_REASON_QSTA_REQUIRE_SETUP,
 793                                         true);
 794                         }
 795                         mutex_unlock(&local->sta_mtx);
 796                 } else switch (sdata->vif.type) {
 797                 case NL80211_IFTYPE_STATION:
 798                         ieee80211_sta_rx_queued_mgmt(sdata, skb);
 799                         break;
 800                 case NL80211_IFTYPE_ADHOC:
 801                         ieee80211_ibss_rx_queued_mgmt(sdata, skb);
 802                         break;
 803                 case NL80211_IFTYPE_MESH_POINT:
 804                         if (!ieee80211_vif_is_mesh(&sdata->vif))
 805                                 break;
 806                         ieee80211_mesh_rx_queued_mgmt(sdata, skb);
 807                         break;
 808                 default:
 809                         WARN(1, "frame for unexpected interface type");
 810                         break;
 811                 }
 812
 813                 kfree_skb(skb);
 814         }
 815
 816         /* then other type-dependent work */
 817         switch (sdata->vif.type) {
 818         case NL80211_IFTYPE_STATION:
 819                 ieee80211_sta_work(sdata);
 820                 break;
 821         case NL80211_IFTYPE_ADHOC:
 822                 ieee80211_ibss_work(sdata);
 823                 break;
 824         case NL80211_IFTYPE_MESH_POINT:
 825                 if (!ieee80211_vif_is_mesh(&sdata->vif))
 826                         break;
 827                 ieee80211_mesh_work(sdata);
 828                 break;
 829         default:
 830                 break;
 831         }
 832 }
 833
 834
 835 /*
 836  * Helper function to initialise an interface to a specific type.
 837  */
 838 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
 839                                   enum nl80211_iftype type)
 840 {
 841         /* clear type-dependent union */
 842         memset(&sdata->u, 0, sizeof(sdata->u));
 843
 844         /* and set some type-dependent values */
 845         sdata->vif.type = type;
 846         sdata->vif.p2p = false;
 847         sdata->dev->netdev_ops = &ieee80211_dataif_ops;
 848         sdata->wdev.iftype = type;
 849
 850         sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
 851         sdata->control_port_no_encrypt = false;
 852
 853         /* only monitor differs */
 854         sdata->dev->type = ARPHRD_ETHER;
 855
 856         skb_queue_head_init(&sdata->skb_queue);
 857         INIT_WORK(&sdata->work, ieee80211_iface_work);
 858
 859         switch (type) {
 860         case NL80211_IFTYPE_P2P_GO:
 861                 type = NL80211_IFTYPE_AP;
 862                 sdata->vif.type = type;
 863                 sdata->vif.p2p = true;
 864                 /* fall through */
 865         case NL80211_IFTYPE_AP:
 866                 skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
 867                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
 868                 break;
 869         case NL80211_IFTYPE_P2P_CLIENT:
 870                 type = NL80211_IFTYPE_STATION;
 871                 sdata->vif.type = type;
 872                 sdata->vif.p2p = true;
 873                 /* fall through */
 874         case NL80211_IFTYPE_STATION:
 875                 ieee80211_sta_setup_sdata(sdata);
 876                 break;
 877         case NL80211_IFTYPE_ADHOC:
 878                 ieee80211_ibss_setup_sdata(sdata);
 879                 break;
 880         case NL80211_IFTYPE_MESH_POINT:
 881                 if (ieee80211_vif_is_mesh(&sdata->vif))
 882                         ieee80211_mesh_init_sdata(sdata);
 883                 break;
 884         case NL80211_IFTYPE_MONITOR:
 885                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
 886                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
 887                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
 888                                       MONITOR_FLAG_OTHER_BSS;
 889                 break;
 890         case NL80211_IFTYPE_WDS:
 891         case NL80211_IFTYPE_AP_VLAN:
 892                 break;
 893         case NL80211_IFTYPE_UNSPECIFIED:
 894         case NUM_NL80211_IFTYPES:
 895                 BUG();
 896                 break;
 897         }
 898
 899         ieee80211_debugfs_add_netdev(sdata);
 900 }
 901
 902 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
 903                                            enum nl80211_iftype type)
 904 {
 905         struct ieee80211_local *local = sdata->local;
 906         int ret, err;
 907         enum nl80211_iftype internal_type = type;
 908         bool p2p = false;
 909
 910         ASSERT_RTNL();
 911
 912         if (!local->ops->change_interface)
 913                 return -EBUSY;
 914
 915         switch (sdata->vif.type) {
 916         case NL80211_IFTYPE_AP:
 917         case NL80211_IFTYPE_STATION:
 918         case NL80211_IFTYPE_ADHOC:
 919                 /*
 920                  * Could maybe also all others here?
 921                  * Just not sure how that interacts
 922                  * with the RX/config path e.g. for
 923                  * mesh.
 924                  */
 925                 break;
 926         default:
 927                 return -EBUSY;
 928         }
 929
 930         switch (type) {
 931         case NL80211_IFTYPE_AP:
 932         case NL80211_IFTYPE_STATION:
 933         case NL80211_IFTYPE_ADHOC:
 934                 /*
 935                  * Could probably support everything
 936                  * but WDS here (WDS do_open can fail
 937                  * under memory pressure, which this
 938                  * code isn't prepared to handle).
 939                  */
 940                 break;
 941         case NL80211_IFTYPE_P2P_CLIENT:
 942                 p2p = true;
 943                 internal_type = NL80211_IFTYPE_STATION;
 944                 break;
 945         case NL80211_IFTYPE_P2P_GO:
 946                 p2p = true;
 947                 internal_type = NL80211_IFTYPE_AP;
 948                 break;
 949         default:
 950                 return -EBUSY;
 951         }
 952
 953         ret = ieee80211_check_concurrent_iface(sdata, internal_type);
 954         if (ret)
 955                 return ret;
 956
 957         ieee80211_do_stop(sdata, false);
 958
 959         ieee80211_teardown_sdata(sdata->dev);
 960
 961         ret = drv_change_interface(local, sdata, internal_type, p2p);
 962         if (ret)
 963                 type = sdata->vif.type;
 964
 965         ieee80211_setup_sdata(sdata, type);
 966
 967         err = ieee80211_do_open(sdata->dev, false);
 968         WARN(err, "type change: do_open returned %d", err);
 969
 970         return ret;
 971 }
 972
 973 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
 974                              enum nl80211_iftype type)
 975 {
 976         int ret;
 977
 978         ASSERT_RTNL();
 979
 980         if (type == ieee80211_vif_type_p2p(&sdata->vif))
 981                 return 0;
 982
 983         /* Setting ad-hoc mode on non-IBSS channel is not supported. */
 984         if (sdata->local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS &&
 985             type == NL80211_IFTYPE_ADHOC)
 986                 return -EOPNOTSUPP;
 987
 988         if (ieee80211_sdata_running(sdata)) {
 989                 ret = ieee80211_runtime_change_iftype(sdata, type);
 990                 if (ret)
 991                         return ret;
 992         } else {
 993                 /* Purge and reset type-dependent state. */
 994                 ieee80211_teardown_sdata(sdata->dev);
 995                 ieee80211_setup_sdata(sdata, type);
 996         }
 997
 998         /* reset some values that shouldn't be kept across type changes */
 999         sdata->vif.bss_conf.basic_rates =
1000                 ieee80211_mandatory_rates(sdata->local,
1001                         sdata->local->hw.conf.channel->band);
1002         sdata->drop_unencrypted = 0;
1003         if (type == NL80211_IFTYPE_STATION)
1004                 sdata->u.mgd.use_4addr = false;
1005
1006         return 0;
1007 }
1008
1009 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1010                                        struct net_device *dev,
1011                                        enum nl80211_iftype type)
1012 {
1013         struct ieee80211_sub_if_data *sdata;
1014         u64 mask, start, addr, val, inc;
1015         u8 *m;
1016         u8 tmp_addr[ETH_ALEN];
1017         int i;
1018
1019         /* default ... something at least */
1020         memcpy(dev->perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1021
1022         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1023             local->hw.wiphy->n_addresses <= 1)
1024                 return;
1025
1026
1027         mutex_lock(&local->iflist_mtx);
1028
1029         switch (type) {
1030         case NL80211_IFTYPE_MONITOR:
1031                 /* doesn't matter */
1032                 break;
1033         case NL80211_IFTYPE_WDS:
1034         case NL80211_IFTYPE_AP_VLAN:
1035                 /* match up with an AP interface */
1036                 list_for_each_entry(sdata, &local->interfaces, list) {
1037                         if (sdata->vif.type != NL80211_IFTYPE_AP)
1038                                 continue;
1039                         memcpy(dev->perm_addr, sdata->vif.addr, ETH_ALEN);
1040                         break;
1041                 }
1042                 /* keep default if no AP interface present */
1043                 break;
1044         default:
1045                 /* assign a new address if possible -- try n_addresses first */
1046                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1047                         bool used = false;
1048
1049                         list_for_each_entry(sdata, &local->interfaces, list) {
1050                                 if (memcmp(local->hw.wiphy->addresses[i].addr,
1051                                            sdata->vif.addr, ETH_ALEN) == 0) {
1052                                         used = true;
1053                                         break;
1054                                 }
1055                         }
1056
1057                         if (!used) {
1058                                 memcpy(dev->perm_addr,
1059                                        local->hw.wiphy->addresses[i].addr,
1060                                        ETH_ALEN);
1061                                 break;
1062                         }
1063                 }
1064
1065                 /* try mask if available */
1066                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1067                         break;
1068
1069                 m = local->hw.wiphy->addr_mask;
1070                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1071                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1072                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1073
1074                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1075                         /* not a contiguous mask ... not handled now! */
1076                         printk(KERN_DEBUG "not contiguous\n");
1077                         break;
1078                 }
1079
1080                 m = local->hw.wiphy->perm_addr;
1081                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1082                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1083                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1084
1085                 inc = 1ULL<<__ffs64(mask);
1086                 val = (start & mask);
1087                 addr = (start & ~mask) | (val & mask);
1088                 do {
1089                         bool used = false;
1090
1091                         tmp_addr[5] = addr >> 0*8;
1092                         tmp_addr[4] = addr >> 1*8;
1093                         tmp_addr[3] = addr >> 2*8;
1094                         tmp_addr[2] = addr >> 3*8;
1095                         tmp_addr[1] = addr >> 4*8;
1096                         tmp_addr[0] = addr >> 5*8;
1097
1098                         val += inc;
1099
1100                         list_for_each_entry(sdata, &local->interfaces, list) {
1101                                 if (memcmp(tmp_addr, sdata->vif.addr,
1102                                                         ETH_ALEN) == 0) {
1103                                         used = true;
1104                                         break;
1105                                 }
1106                         }
1107
1108                         if (!used) {
1109                                 memcpy(dev->perm_addr, tmp_addr, ETH_ALEN);
1110                                 break;
1111                         }
1112                         addr = (start & ~mask) | (val & mask);
1113                 } while (addr != start);
1114
1115                 break;
1116         }
1117
1118         mutex_unlock(&local->iflist_mtx);
1119 }
1120
1121 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1122                      struct net_device **new_dev, enum nl80211_iftype type,
1123                      struct vif_params *params)
1124 {
1125         struct net_device *ndev;
1126         struct ieee80211_sub_if_data *sdata = NULL;
1127         int ret, i;
1128
1129         ASSERT_RTNL();
1130
1131         ndev = alloc_netdev_mqs(sizeof(*sdata) + local->hw.vif_data_size,
1132                                 name, ieee80211_if_setup, local->hw.queues, 1);
1133         if (!ndev)
1134                 return -ENOMEM;
1135         dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1136
1137         ndev->needed_headroom = local->tx_headroom +
1138                                 4*6 /* four MAC addresses */
1139                                 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1140                                 + 6 /* mesh */
1141                                 + 8 /* rfc1042/bridge tunnel */
1142                                 - ETH_HLEN /* ethernet hard_header_len */
1143                                 + IEEE80211_ENCRYPT_HEADROOM;
1144         ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1145
1146         ret = dev_alloc_name(ndev, ndev->name);
1147         if (ret < 0)
1148                 goto fail;
1149
1150         ieee80211_assign_perm_addr(local, ndev, type);
1151         memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1152         SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1153
1154         /* don't use IEEE80211_DEV_TO_SUB_IF because it checks too much */
1155         sdata = netdev_priv(ndev);
1156         ndev->ieee80211_ptr = &sdata->wdev;
1157         memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1158         memcpy(sdata->name, ndev->name, IFNAMSIZ);
1159
1160         /* initialise type-independent data */
1161         sdata->wdev.wiphy = local->hw.wiphy;
1162         sdata->local = local;
1163         sdata->dev = ndev;
1164 #ifdef CONFIG_INET
1165         sdata->arp_filter_state = true;
1166 #endif
1167
1168         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1169                 skb_queue_head_init(&sdata->fragments[i].skb_list);
1170
1171         INIT_LIST_HEAD(&sdata->key_list);
1172
1173         for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1174                 struct ieee80211_supported_band *sband;
1175                 sband = local->hw.wiphy->bands[i];
1176                 sdata->rc_rateidx_mask[i] =
1177                         sband ? (1 << sband->n_bitrates) - 1 : 0;
1178         }
1179
1180         /* setup type-dependent data */
1181         ieee80211_setup_sdata(sdata, type);
1182
1183         if (params) {
1184                 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1185                 if (type == NL80211_IFTYPE_STATION)
1186                         sdata->u.mgd.use_4addr = params->use_4addr;
1187         }
1188
1189         ret = register_netdevice(ndev);
1190         if (ret)
1191                 goto fail;
1192
1193         mutex_lock(&local->iflist_mtx);
1194         list_add_tail_rcu(&sdata->list, &local->interfaces);
1195         mutex_unlock(&local->iflist_mtx);
1196
1197         if (new_dev)
1198                 *new_dev = ndev;
1199
1200         return 0;
1201
1202  fail:
1203         free_netdev(ndev);
1204         return ret;
1205 }
1206
1207 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1208 {
1209         ASSERT_RTNL();
1210
1211         mutex_lock(&sdata->local->iflist_mtx);
1212         list_del_rcu(&sdata->list);
1213         mutex_unlock(&sdata->local->iflist_mtx);
1214
1215         if (ieee80211_vif_is_mesh(&sdata->vif))
1216                 mesh_path_flush_by_iface(sdata);
1217
1218         synchronize_rcu();
1219         unregister_netdevice(sdata->dev);
1220 }
1221
1222 /*
1223  * Remove all interfaces, may only be called at hardware unregistration
1224  * time because it doesn't do RCU-safe list removals.
1225  */
1226 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1227 {
1228         struct ieee80211_sub_if_data *sdata, *tmp;
1229         LIST_HEAD(unreg_list);
1230
1231         ASSERT_RTNL();
1232
1233         mutex_lock(&local->iflist_mtx);
1234         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1235                 list_del(&sdata->list);
1236
1237                 if (ieee80211_vif_is_mesh(&sdata->vif))
1238                         mesh_path_flush_by_iface(sdata);
1239
1240                 unregister_netdevice_queue(sdata->dev, &unreg_list);
1241         }
1242         mutex_unlock(&local->iflist_mtx);
1243         unregister_netdevice_many(&unreg_list);
1244         list_del(&unreg_list);
1245 }
1246
1247 static u32 ieee80211_idle_off(struct ieee80211_local *local,
1248                               const char *reason)
1249 {
1250         if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
1251                 return 0;
1252
1253 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1254         wiphy_debug(local->hw.wiphy, "device no longer idle - %s\n", reason);
1255 #endif
1256
1257         local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
1258         return IEEE80211_CONF_CHANGE_IDLE;
1259 }
1260
1261 static u32 ieee80211_idle_on(struct ieee80211_local *local)
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 now idle\n");
1268 #endif
1269
1270         drv_flush(local, false);
1271
1272         local->hw.conf.flags |= IEEE80211_CONF_IDLE;
1273         return IEEE80211_CONF_CHANGE_IDLE;
1274 }
1275
1276 u32 __ieee80211_recalc_idle(struct ieee80211_local *local)
1277 {
1278         struct ieee80211_sub_if_data *sdata;
1279         int count = 0;
1280         bool working = false, scanning = false, hw_roc = false;
1281         struct ieee80211_work *wk;
1282         unsigned int led_trig_start = 0, led_trig_stop = 0;
1283
1284 #ifdef CONFIG_PROVE_LOCKING
1285         WARN_ON(debug_locks && !lockdep_rtnl_is_held() &&
1286                 !lockdep_is_held(&local->iflist_mtx));
1287 #endif
1288         lockdep_assert_held(&local->mtx);
1289
1290         list_for_each_entry(sdata, &local->interfaces, list) {
1291                 if (!ieee80211_sdata_running(sdata)) {
1292                         sdata->vif.bss_conf.idle = true;
1293                         continue;
1294                 }
1295
1296                 sdata->old_idle = sdata->vif.bss_conf.idle;
1297
1298                 /* do not count disabled managed interfaces */
1299                 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1300                     !sdata->u.mgd.associated) {
1301                         sdata->vif.bss_conf.idle = true;
1302                         continue;
1303                 }
1304                 /* do not count unused IBSS interfaces */
1305                 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
1306                     !sdata->u.ibss.ssid_len) {
1307                         sdata->vif.bss_conf.idle = true;
1308                         continue;
1309                 }
1310                 /* count everything else */
1311                 count++;
1312         }
1313
1314         list_for_each_entry(wk, &local->work_list, list) {
1315                 working = true;
1316                 wk->sdata->vif.bss_conf.idle = false;
1317         }
1318
1319         if (local->scan_sdata) {
1320                 scanning = true;
1321                 local->scan_sdata->vif.bss_conf.idle = false;
1322         }
1323
1324         if (local->hw_roc_channel)
1325                 hw_roc = true;
1326
1327         list_for_each_entry(sdata, &local->interfaces, list) {
1328                 if (sdata->old_idle == sdata->vif.bss_conf.idle)
1329                         continue;
1330                 if (!ieee80211_sdata_running(sdata))
1331                         continue;
1332                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_IDLE);
1333         }
1334
1335         if (working || scanning || hw_roc)
1336                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
1337         else
1338                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
1339
1340         if (count)
1341                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
1342         else
1343                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
1344
1345         ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
1346
1347         if (hw_roc)
1348                 return ieee80211_idle_off(local, "hw remain-on-channel");
1349         if (working)
1350                 return ieee80211_idle_off(local, "working");
1351         if (scanning)
1352                 return ieee80211_idle_off(local, "scanning");
1353         if (!count)
1354                 return ieee80211_idle_on(local);
1355         else
1356                 return ieee80211_idle_off(local, "in use");
1357
1358         return 0;
1359 }
1360
1361 void ieee80211_recalc_idle(struct ieee80211_local *local)
1362 {
1363         u32 chg;
1364
1365         mutex_lock(&local->iflist_mtx);
1366         chg = __ieee80211_recalc_idle(local);
1367         mutex_unlock(&local->iflist_mtx);
1368         if (chg)
1369                 ieee80211_hw_config(local, chg);
1370 }
1371
1372 static int netdev_notify(struct notifier_block *nb,
1373                          unsigned long state,
1374                          void *ndev)
1375 {
1376         struct net_device *dev = ndev;
1377         struct ieee80211_sub_if_data *sdata;
1378
1379         if (state != NETDEV_CHANGENAME)
1380                 return 0;
1381
1382         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1383                 return 0;
1384
1385         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1386                 return 0;
1387
1388         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1389
1390         memcpy(sdata->name, dev->name, IFNAMSIZ);
1391
1392         ieee80211_debugfs_rename_netdev(sdata);
1393         return 0;
1394 }
1395
1396 static struct notifier_block mac80211_netdev_notifier = {
1397         .notifier_call = netdev_notify,
1398 };
1399
1400 int ieee80211_iface_init(void)
1401 {
1402         return register_netdevice_notifier(&mac80211_netdev_notifier);
1403 }
1404
1405 void ieee80211_iface_exit(void)
1406 {
1407         unregister_netdevice_notifier(&mac80211_netdev_notifier);
1408 }