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 atomic bitop required since STA is not live yet */
 303                 set_sta_flag(sta, 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                 mutex_lock(&local->mtx);
 499                 if (local->hw_roc_dev == sdata->dev &&
 500                     local->hw_roc_channel) {
 501                         /* ignore return value since this is racy */
 502                         drv_cancel_remain_on_channel(local);
 503                         ieee80211_queue_work(&local->hw, &local->hw_roc_done);
 504                 }
 505                 mutex_unlock(&local->mtx);
 506
 507                 flush_work(&local->hw_roc_start);
 508                 flush_work(&local->hw_roc_done);
 509
 510                 flush_work(&sdata->work);
 511                 /*
 512                  * When we get here, the interface is marked down.
 513                  * Call synchronize_rcu() to wait for the RX path
 514                  * should it be using the interface and enqueuing
 515                  * frames at this very time on another CPU.
 516                  */
 517                 synchronize_rcu();
 518                 skb_queue_purge(&sdata->skb_queue);
 519
 520                 /*
 521                  * Disable beaconing here for mesh only, AP and IBSS
 522                  * are already taken care of.
 523                  */
 524                 if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
 525                         ieee80211_bss_info_change_notify(sdata,
 526                                 BSS_CHANGED_BEACON_ENABLED);
 527
 528                 /*
 529                  * Free all remaining keys, there shouldn't be any,
 530                  * except maybe group keys in AP more or WDS?
 531                  */
 532                 ieee80211_free_keys(sdata);
 533
 534                 if (going_down)
 535                         drv_remove_interface(local, &sdata->vif);
 536         }
 537
 538         sdata->bss = NULL;
 539
 540         mutex_lock(&local->mtx);
 541         hw_reconf_flags |= __ieee80211_recalc_idle(local);
 542         mutex_unlock(&local->mtx);
 543
 544         ieee80211_recalc_ps(local, -1);
 545
 546         if (local->open_count == 0) {
 547                 if (local->ops->napi_poll)
 548                         napi_disable(&local->napi);
 549                 ieee80211_clear_tx_pending(local);
 550                 ieee80211_stop_device(local);
 551
 552                 /* no reconfiguring after stop! */
 553                 hw_reconf_flags = 0;
 554         }
 555
 556         /* Re-calculate channel-type, in case there are multiple vifs
 557          * on different channel types.
 558          */
 559         orig_ct = local->_oper_channel_type;
 560         ieee80211_set_channel_type(local, NULL, NL80211_CHAN_NO_HT);
 561
 562         /* do after stop to avoid reconfiguring when we stop anyway */
 563         if (hw_reconf_flags || (orig_ct != local->_oper_channel_type))
 564                 ieee80211_hw_config(local, hw_reconf_flags);
 565
 566         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 567         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 568                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
 569                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 570                         if (info->control.vif == &sdata->vif) {
 571                                 __skb_unlink(skb, &local->pending[i]);
 572                                 dev_kfree_skb_irq(skb);
 573                         }
 574                 }
 575         }
 576         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 577 }
 578
 579 static int ieee80211_stop(struct net_device *dev)
 580 {
 581         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 582
 583         ieee80211_do_stop(sdata, true);
 584
 585         return 0;
 586 }
 587
 588 static void ieee80211_set_multicast_list(struct net_device *dev)
 589 {
 590         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 591         struct ieee80211_local *local = sdata->local;
 592         int allmulti, promisc, sdata_allmulti, sdata_promisc;
 593
 594         allmulti = !!(dev->flags & IFF_ALLMULTI);
 595         promisc = !!(dev->flags & IFF_PROMISC);
 596         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
 597         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
 598
 599         if (allmulti != sdata_allmulti) {
 600                 if (dev->flags & IFF_ALLMULTI)
 601                         atomic_inc(&local->iff_allmultis);
 602                 else
 603                         atomic_dec(&local->iff_allmultis);
 604                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
 605         }
 606
 607         if (promisc != sdata_promisc) {
 608                 if (dev->flags & IFF_PROMISC)
 609                         atomic_inc(&local->iff_promiscs);
 610                 else
 611                         atomic_dec(&local->iff_promiscs);
 612                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
 613         }
 614         spin_lock_bh(&local->filter_lock);
 615         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
 616         spin_unlock_bh(&local->filter_lock);
 617         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
 618 }
 619
 620 /*
 621  * Called when the netdev is removed or, by the code below, before
 622  * the interface type changes.
 623  */
 624 static void ieee80211_teardown_sdata(struct net_device *dev)
 625 {
 626         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 627         struct ieee80211_local *local = sdata->local;
 628         int flushed;
 629         int i;
 630
 631         /* free extra data */
 632         ieee80211_free_keys(sdata);
 633
 634         ieee80211_debugfs_remove_netdev(sdata);
 635
 636         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
 637                 __skb_queue_purge(&sdata->fragments[i].skb_list);
 638         sdata->fragment_next = 0;
 639
 640         if (ieee80211_vif_is_mesh(&sdata->vif))
 641                 mesh_rmc_free(sdata);
 642
 643         flushed = sta_info_flush(local, sdata);
 644         WARN_ON(flushed);
 645 }
 646
 647 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
 648                                          struct sk_buff *skb)
 649 {
 650         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
 651 }
 652
 653 static const struct net_device_ops ieee80211_dataif_ops = {
 654         .ndo_open               = ieee80211_open,
 655         .ndo_stop               = ieee80211_stop,
 656         .ndo_uninit             = ieee80211_teardown_sdata,
 657         .ndo_start_xmit         = ieee80211_subif_start_xmit,
 658         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
 659         .ndo_change_mtu         = ieee80211_change_mtu,
 660         .ndo_set_mac_address    = ieee80211_change_mac,
 661         .ndo_select_queue       = ieee80211_netdev_select_queue,
 662 };
 663
 664 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
 665                                           struct sk_buff *skb)
 666 {
 667         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 668         struct ieee80211_local *local = sdata->local;
 669         struct ieee80211_hdr *hdr;
 670         struct ieee80211_radiotap_header *rtap = (void *)skb->data;
 671         u8 *p;
 672
 673         if (local->hw.queues < 4)
 674                 return 0;
 675
 676         if (skb->len < 4 ||
 677             skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
 678                 return 0; /* doesn't matter, frame will be dropped */
 679
 680         hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
 681
 682         if (!ieee80211_is_data(hdr->frame_control)) {
 683                 skb->priority = 7;
 684                 return ieee802_1d_to_ac[skb->priority];
 685         }
 686         if (!ieee80211_is_data_qos(hdr->frame_control)) {
 687                 skb->priority = 0;
 688                 return ieee802_1d_to_ac[skb->priority];
 689         }
 690
 691         p = ieee80211_get_qos_ctl(hdr);
 692         skb->priority = *p & IEEE80211_QOS_CTL_TAG1D_MASK;
 693
 694         return ieee80211_downgrade_queue(local, skb);
 695 }
 696
 697 static const struct net_device_ops ieee80211_monitorif_ops = {
 698         .ndo_open               = ieee80211_open,
 699         .ndo_stop               = ieee80211_stop,
 700         .ndo_uninit             = ieee80211_teardown_sdata,
 701         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
 702         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
 703         .ndo_change_mtu         = ieee80211_change_mtu,
 704         .ndo_set_mac_address    = eth_mac_addr,
 705         .ndo_select_queue       = ieee80211_monitor_select_queue,
 706 };
 707
 708 static void ieee80211_if_setup(struct net_device *dev)
 709 {
 710         ether_setup(dev);
 711         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
 712         dev->netdev_ops = &ieee80211_dataif_ops;
 713         dev->destructor = free_netdev;
 714 }
 715
 716 static void ieee80211_iface_work(struct work_struct *work)
 717 {
 718         struct ieee80211_sub_if_data *sdata =
 719                 container_of(work, struct ieee80211_sub_if_data, work);
 720         struct ieee80211_local *local = sdata->local;
 721         struct sk_buff *skb;
 722         struct sta_info *sta;
 723         struct ieee80211_ra_tid *ra_tid;
 724
 725         if (!ieee80211_sdata_running(sdata))
 726                 return;
 727
 728         if (local->scanning)
 729                 return;
 730
 731         /*
 732          * ieee80211_queue_work() should have picked up most cases,
 733          * here we'll pick the rest.
 734          */
 735         if (WARN(local->suspended,
 736                  "interface work scheduled while going to suspend\n"))
 737                 return;
 738
 739         /* first process frames */
 740         while ((skb = skb_dequeue(&sdata->skb_queue))) {
 741                 struct ieee80211_mgmt *mgmt = (void *)skb->data;
 742
 743                 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
 744                         ra_tid = (void *)&skb->cb;
 745                         ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
 746                                                  ra_tid->tid);
 747                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
 748                         ra_tid = (void *)&skb->cb;
 749                         ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
 750                                                 ra_tid->tid);
 751                 } else if (ieee80211_is_action(mgmt->frame_control) &&
 752                            mgmt->u.action.category == WLAN_CATEGORY_BACK) {
 753                         int len = skb->len;
 754
 755                         mutex_lock(&local->sta_mtx);
 756                         sta = sta_info_get_bss(sdata, mgmt->sa);
 757                         if (sta) {
 758                                 switch (mgmt->u.action.u.addba_req.action_code) {
 759                                 case WLAN_ACTION_ADDBA_REQ:
 760                                         ieee80211_process_addba_request(
 761                                                         local, sta, mgmt, len);
 762                                         break;
 763                                 case WLAN_ACTION_ADDBA_RESP:
 764                                         ieee80211_process_addba_resp(local, sta,
 765                                                                      mgmt, len);
 766                                         break;
 767                                 case WLAN_ACTION_DELBA:
 768                                         ieee80211_process_delba(sdata, sta,
 769                                                                 mgmt, len);
 770                                         break;
 771                                 default:
 772                                         WARN_ON(1);
 773                                         break;
 774                                 }
 775                         }
 776                         mutex_unlock(&local->sta_mtx);
 777                 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
 778                         struct ieee80211_hdr *hdr = (void *)mgmt;
 779                         /*
 780                          * So the frame isn't mgmt, but frame_control
 781                          * is at the right place anyway, of course, so
 782                          * the if statement is correct.
 783                          *
 784                          * Warn if we have other data frame types here,
 785                          * they must not get here.
 786                          */
 787                         WARN_ON(hdr->frame_control &
 788                                         cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
 789                         WARN_ON(!(hdr->seq_ctrl &
 790                                         cpu_to_le16(IEEE80211_SCTL_FRAG)));
 791                         /*
 792                          * This was a fragment of a frame, received while
 793                          * a block-ack session was active. That cannot be
 794                          * right, so terminate the session.
 795                          */
 796                         mutex_lock(&local->sta_mtx);
 797                         sta = sta_info_get_bss(sdata, mgmt->sa);
 798                         if (sta) {
 799                                 u16 tid = *ieee80211_get_qos_ctl(hdr) &
 800                                                 IEEE80211_QOS_CTL_TID_MASK;
 801
 802                                 __ieee80211_stop_rx_ba_session(
 803                                         sta, tid, WLAN_BACK_RECIPIENT,
 804                                         WLAN_REASON_QSTA_REQUIRE_SETUP,
 805                                         true);
 806                         }
 807                         mutex_unlock(&local->sta_mtx);
 808                 } else switch (sdata->vif.type) {
 809                 case NL80211_IFTYPE_STATION:
 810                         ieee80211_sta_rx_queued_mgmt(sdata, skb);
 811                         break;
 812                 case NL80211_IFTYPE_ADHOC:
 813                         ieee80211_ibss_rx_queued_mgmt(sdata, skb);
 814                         break;
 815                 case NL80211_IFTYPE_MESH_POINT:
 816                         if (!ieee80211_vif_is_mesh(&sdata->vif))
 817                                 break;
 818                         ieee80211_mesh_rx_queued_mgmt(sdata, skb);
 819                         break;
 820                 default:
 821                         WARN(1, "frame for unexpected interface type");
 822                         break;
 823                 }
 824
 825                 kfree_skb(skb);
 826         }
 827
 828         /* then other type-dependent work */
 829         switch (sdata->vif.type) {
 830         case NL80211_IFTYPE_STATION:
 831                 ieee80211_sta_work(sdata);
 832                 break;
 833         case NL80211_IFTYPE_ADHOC:
 834                 ieee80211_ibss_work(sdata);
 835                 break;
 836         case NL80211_IFTYPE_MESH_POINT:
 837                 if (!ieee80211_vif_is_mesh(&sdata->vif))
 838                         break;
 839                 ieee80211_mesh_work(sdata);
 840                 break;
 841         default:
 842                 break;
 843         }
 844 }
 845
 846
 847 /*
 848  * Helper function to initialise an interface to a specific type.
 849  */
 850 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
 851                                   enum nl80211_iftype type)
 852 {
 853         /* clear type-dependent union */
 854         memset(&sdata->u, 0, sizeof(sdata->u));
 855
 856         /* and set some type-dependent values */
 857         sdata->vif.type = type;
 858         sdata->vif.p2p = false;
 859         sdata->dev->netdev_ops = &ieee80211_dataif_ops;
 860         sdata->wdev.iftype = type;
 861
 862         sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
 863         sdata->control_port_no_encrypt = false;
 864
 865         /* only monitor differs */
 866         sdata->dev->type = ARPHRD_ETHER;
 867
 868         skb_queue_head_init(&sdata->skb_queue);
 869         INIT_WORK(&sdata->work, ieee80211_iface_work);
 870
 871         switch (type) {
 872         case NL80211_IFTYPE_P2P_GO:
 873                 type = NL80211_IFTYPE_AP;
 874                 sdata->vif.type = type;
 875                 sdata->vif.p2p = true;
 876                 /* fall through */
 877         case NL80211_IFTYPE_AP:
 878                 skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
 879                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
 880                 break;
 881         case NL80211_IFTYPE_P2P_CLIENT:
 882                 type = NL80211_IFTYPE_STATION;
 883                 sdata->vif.type = type;
 884                 sdata->vif.p2p = true;
 885                 /* fall through */
 886         case NL80211_IFTYPE_STATION:
 887                 ieee80211_sta_setup_sdata(sdata);
 888                 break;
 889         case NL80211_IFTYPE_ADHOC:
 890                 ieee80211_ibss_setup_sdata(sdata);
 891                 break;
 892         case NL80211_IFTYPE_MESH_POINT:
 893                 if (ieee80211_vif_is_mesh(&sdata->vif))
 894                         ieee80211_mesh_init_sdata(sdata);
 895                 break;
 896         case NL80211_IFTYPE_MONITOR:
 897                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
 898                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
 899                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
 900                                       MONITOR_FLAG_OTHER_BSS;
 901                 break;
 902         case NL80211_IFTYPE_WDS:
 903         case NL80211_IFTYPE_AP_VLAN:
 904                 break;
 905         case NL80211_IFTYPE_UNSPECIFIED:
 906         case NUM_NL80211_IFTYPES:
 907                 BUG();
 908                 break;
 909         }
 910
 911         ieee80211_debugfs_add_netdev(sdata);
 912 }
 913
 914 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
 915                                            enum nl80211_iftype type)
 916 {
 917         struct ieee80211_local *local = sdata->local;
 918         int ret, err;
 919         enum nl80211_iftype internal_type = type;
 920         bool p2p = false;
 921
 922         ASSERT_RTNL();
 923
 924         if (!local->ops->change_interface)
 925                 return -EBUSY;
 926
 927         switch (sdata->vif.type) {
 928         case NL80211_IFTYPE_AP:
 929         case NL80211_IFTYPE_STATION:
 930         case NL80211_IFTYPE_ADHOC:
 931                 /*
 932                  * Could maybe also all others here?
 933                  * Just not sure how that interacts
 934                  * with the RX/config path e.g. for
 935                  * mesh.
 936                  */
 937                 break;
 938         default:
 939                 return -EBUSY;
 940         }
 941
 942         switch (type) {
 943         case NL80211_IFTYPE_AP:
 944         case NL80211_IFTYPE_STATION:
 945         case NL80211_IFTYPE_ADHOC:
 946                 /*
 947                  * Could probably support everything
 948                  * but WDS here (WDS do_open can fail
 949                  * under memory pressure, which this
 950                  * code isn't prepared to handle).
 951                  */
 952                 break;
 953         case NL80211_IFTYPE_P2P_CLIENT:
 954                 p2p = true;
 955                 internal_type = NL80211_IFTYPE_STATION;
 956                 break;
 957         case NL80211_IFTYPE_P2P_GO:
 958                 p2p = true;
 959                 internal_type = NL80211_IFTYPE_AP;
 960                 break;
 961         default:
 962                 return -EBUSY;
 963         }
 964
 965         ret = ieee80211_check_concurrent_iface(sdata, internal_type);
 966         if (ret)
 967                 return ret;
 968
 969         ieee80211_do_stop(sdata, false);
 970
 971         ieee80211_teardown_sdata(sdata->dev);
 972
 973         ret = drv_change_interface(local, sdata, internal_type, p2p);
 974         if (ret)
 975                 type = sdata->vif.type;
 976
 977         ieee80211_setup_sdata(sdata, type);
 978
 979         err = ieee80211_do_open(sdata->dev, false);
 980         WARN(err, "type change: do_open returned %d", err);
 981
 982         return ret;
 983 }
 984
 985 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
 986                              enum nl80211_iftype type)
 987 {
 988         int ret;
 989
 990         ASSERT_RTNL();
 991
 992         if (type == ieee80211_vif_type_p2p(&sdata->vif))
 993                 return 0;
 994
 995         /* Setting ad-hoc mode on non-IBSS channel is not supported. */
 996         if (sdata->local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS &&
 997             type == NL80211_IFTYPE_ADHOC)
 998                 return -EOPNOTSUPP;
 999
1000         if (ieee80211_sdata_running(sdata)) {
1001                 ret = ieee80211_runtime_change_iftype(sdata, type);
1002                 if (ret)
1003                         return ret;
1004         } else {
1005                 /* Purge and reset type-dependent state. */
1006                 ieee80211_teardown_sdata(sdata->dev);
1007                 ieee80211_setup_sdata(sdata, type);
1008         }
1009
1010         /* reset some values that shouldn't be kept across type changes */
1011         sdata->vif.bss_conf.basic_rates =
1012                 ieee80211_mandatory_rates(sdata->local,
1013                         sdata->local->hw.conf.channel->band);
1014         sdata->drop_unencrypted = 0;
1015         if (type == NL80211_IFTYPE_STATION)
1016                 sdata->u.mgd.use_4addr = false;
1017
1018         return 0;
1019 }
1020
1021 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1022                                        struct net_device *dev,
1023                                        enum nl80211_iftype type)
1024 {
1025         struct ieee80211_sub_if_data *sdata;
1026         u64 mask, start, addr, val, inc;
1027         u8 *m;
1028         u8 tmp_addr[ETH_ALEN];
1029         int i;
1030
1031         /* default ... something at least */
1032         memcpy(dev->perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1033
1034         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1035             local->hw.wiphy->n_addresses <= 1)
1036                 return;
1037
1038
1039         mutex_lock(&local->iflist_mtx);
1040
1041         switch (type) {
1042         case NL80211_IFTYPE_MONITOR:
1043                 /* doesn't matter */
1044                 break;
1045         case NL80211_IFTYPE_WDS:
1046         case NL80211_IFTYPE_AP_VLAN:
1047                 /* match up with an AP interface */
1048                 list_for_each_entry(sdata, &local->interfaces, list) {
1049                         if (sdata->vif.type != NL80211_IFTYPE_AP)
1050                                 continue;
1051                         memcpy(dev->perm_addr, sdata->vif.addr, ETH_ALEN);
1052                         break;
1053                 }
1054                 /* keep default if no AP interface present */
1055                 break;
1056         default:
1057                 /* assign a new address if possible -- try n_addresses first */
1058                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1059                         bool used = false;
1060
1061                         list_for_each_entry(sdata, &local->interfaces, list) {
1062                                 if (memcmp(local->hw.wiphy->addresses[i].addr,
1063                                            sdata->vif.addr, ETH_ALEN) == 0) {
1064                                         used = true;
1065                                         break;
1066                                 }
1067                         }
1068
1069                         if (!used) {
1070                                 memcpy(dev->perm_addr,
1071                                        local->hw.wiphy->addresses[i].addr,
1072                                        ETH_ALEN);
1073                                 break;
1074                         }
1075                 }
1076
1077                 /* try mask if available */
1078                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1079                         break;
1080
1081                 m = local->hw.wiphy->addr_mask;
1082                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1083                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1084                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1085
1086                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1087                         /* not a contiguous mask ... not handled now! */
1088                         printk(KERN_DEBUG "not contiguous\n");
1089                         break;
1090                 }
1091
1092                 m = local->hw.wiphy->perm_addr;
1093                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1094                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1095                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1096
1097                 inc = 1ULL<<__ffs64(mask);
1098                 val = (start & mask);
1099                 addr = (start & ~mask) | (val & mask);
1100                 do {
1101                         bool used = false;
1102
1103                         tmp_addr[5] = addr >> 0*8;
1104                         tmp_addr[4] = addr >> 1*8;
1105                         tmp_addr[3] = addr >> 2*8;
1106                         tmp_addr[2] = addr >> 3*8;
1107                         tmp_addr[1] = addr >> 4*8;
1108                         tmp_addr[0] = addr >> 5*8;
1109
1110                         val += inc;
1111
1112                         list_for_each_entry(sdata, &local->interfaces, list) {
1113                                 if (memcmp(tmp_addr, sdata->vif.addr,
1114                                                         ETH_ALEN) == 0) {
1115                                         used = true;
1116                                         break;
1117                                 }
1118                         }
1119
1120                         if (!used) {
1121                                 memcpy(dev->perm_addr, tmp_addr, ETH_ALEN);
1122                                 break;
1123                         }
1124                         addr = (start & ~mask) | (val & mask);
1125                 } while (addr != start);
1126
1127                 break;
1128         }
1129
1130         mutex_unlock(&local->iflist_mtx);
1131 }
1132
1133 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1134                      struct net_device **new_dev, enum nl80211_iftype type,
1135                      struct vif_params *params)
1136 {
1137         struct net_device *ndev;
1138         struct ieee80211_sub_if_data *sdata = NULL;
1139         int ret, i;
1140
1141         ASSERT_RTNL();
1142
1143         ndev = alloc_netdev_mqs(sizeof(*sdata) + local->hw.vif_data_size,
1144                                 name, ieee80211_if_setup, local->hw.queues, 1);
1145         if (!ndev)
1146                 return -ENOMEM;
1147         dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1148
1149         ndev->needed_headroom = local->tx_headroom +
1150                                 4*6 /* four MAC addresses */
1151                                 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1152                                 + 6 /* mesh */
1153                                 + 8 /* rfc1042/bridge tunnel */
1154                                 - ETH_HLEN /* ethernet hard_header_len */
1155                                 + IEEE80211_ENCRYPT_HEADROOM;
1156         ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1157
1158         ret = dev_alloc_name(ndev, ndev->name);
1159         if (ret < 0)
1160                 goto fail;
1161
1162         ieee80211_assign_perm_addr(local, ndev, type);
1163         memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1164         SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1165
1166         /* don't use IEEE80211_DEV_TO_SUB_IF because it checks too much */
1167         sdata = netdev_priv(ndev);
1168         ndev->ieee80211_ptr = &sdata->wdev;
1169         memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1170         memcpy(sdata->name, ndev->name, IFNAMSIZ);
1171
1172         /* initialise type-independent data */
1173         sdata->wdev.wiphy = local->hw.wiphy;
1174         sdata->local = local;
1175         sdata->dev = ndev;
1176 #ifdef CONFIG_INET
1177         sdata->arp_filter_state = true;
1178 #endif
1179
1180         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1181                 skb_queue_head_init(&sdata->fragments[i].skb_list);
1182
1183         INIT_LIST_HEAD(&sdata->key_list);
1184
1185         for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1186                 struct ieee80211_supported_band *sband;
1187                 sband = local->hw.wiphy->bands[i];
1188                 sdata->rc_rateidx_mask[i] =
1189                         sband ? (1 << sband->n_bitrates) - 1 : 0;
1190         }
1191
1192         /* setup type-dependent data */
1193         ieee80211_setup_sdata(sdata, type);
1194
1195         if (params) {
1196                 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1197                 if (type == NL80211_IFTYPE_STATION)
1198                         sdata->u.mgd.use_4addr = params->use_4addr;
1199         }
1200
1201         ret = register_netdevice(ndev);
1202         if (ret)
1203                 goto fail;
1204
1205         mutex_lock(&local->iflist_mtx);
1206         list_add_tail_rcu(&sdata->list, &local->interfaces);
1207         mutex_unlock(&local->iflist_mtx);
1208
1209         if (new_dev)
1210                 *new_dev = ndev;
1211
1212         return 0;
1213
1214  fail:
1215         free_netdev(ndev);
1216         return ret;
1217 }
1218
1219 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1220 {
1221         ASSERT_RTNL();
1222
1223         mutex_lock(&sdata->local->iflist_mtx);
1224         list_del_rcu(&sdata->list);
1225         mutex_unlock(&sdata->local->iflist_mtx);
1226
1227         if (ieee80211_vif_is_mesh(&sdata->vif))
1228                 mesh_path_flush_by_iface(sdata);
1229
1230         synchronize_rcu();
1231         unregister_netdevice(sdata->dev);
1232 }
1233
1234 /*
1235  * Remove all interfaces, may only be called at hardware unregistration
1236  * time because it doesn't do RCU-safe list removals.
1237  */
1238 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1239 {
1240         struct ieee80211_sub_if_data *sdata, *tmp;
1241         LIST_HEAD(unreg_list);
1242
1243         ASSERT_RTNL();
1244
1245         /*
1246          * Close all AP_VLAN interfaces first, as otherwise they
1247          * might be closed while the AP interface they belong to
1248          * is closed, causing unregister_netdevice_many() to crash.
1249          */
1250         list_for_each_entry(sdata, &local->interfaces, list)
1251                 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1252                         dev_close(sdata->dev);
1253
1254         mutex_lock(&local->iflist_mtx);
1255         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1256                 list_del(&sdata->list);
1257
1258                 if (ieee80211_vif_is_mesh(&sdata->vif))
1259                         mesh_path_flush_by_iface(sdata);
1260
1261                 unregister_netdevice_queue(sdata->dev, &unreg_list);
1262         }
1263         mutex_unlock(&local->iflist_mtx);
1264         unregister_netdevice_many(&unreg_list);
1265         list_del(&unreg_list);
1266 }
1267
1268 static u32 ieee80211_idle_off(struct ieee80211_local *local,
1269                               const char *reason)
1270 {
1271         if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
1272                 return 0;
1273
1274 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1275         wiphy_debug(local->hw.wiphy, "device no longer idle - %s\n", reason);
1276 #endif
1277
1278         local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
1279         return IEEE80211_CONF_CHANGE_IDLE;
1280 }
1281
1282 static u32 ieee80211_idle_on(struct ieee80211_local *local)
1283 {
1284         if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
1285                 return 0;
1286
1287 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1288         wiphy_debug(local->hw.wiphy, "device now idle\n");
1289 #endif
1290
1291         drv_flush(local, false);
1292
1293         local->hw.conf.flags |= IEEE80211_CONF_IDLE;
1294         return IEEE80211_CONF_CHANGE_IDLE;
1295 }
1296
1297 u32 __ieee80211_recalc_idle(struct ieee80211_local *local)
1298 {
1299         struct ieee80211_sub_if_data *sdata;
1300         int count = 0;
1301         bool working = false, scanning = false, hw_roc = false;
1302         struct ieee80211_work *wk;
1303         unsigned int led_trig_start = 0, led_trig_stop = 0;
1304
1305 #ifdef CONFIG_PROVE_LOCKING
1306         WARN_ON(debug_locks && !lockdep_rtnl_is_held() &&
1307                 !lockdep_is_held(&local->iflist_mtx));
1308 #endif
1309         lockdep_assert_held(&local->mtx);
1310
1311         list_for_each_entry(sdata, &local->interfaces, list) {
1312                 if (!ieee80211_sdata_running(sdata)) {
1313                         sdata->vif.bss_conf.idle = true;
1314                         continue;
1315                 }
1316
1317                 sdata->old_idle = sdata->vif.bss_conf.idle;
1318
1319                 /* do not count disabled managed interfaces */
1320                 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1321                     !sdata->u.mgd.associated) {
1322                         sdata->vif.bss_conf.idle = true;
1323                         continue;
1324                 }
1325                 /* do not count unused IBSS interfaces */
1326                 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
1327                     !sdata->u.ibss.ssid_len) {
1328                         sdata->vif.bss_conf.idle = true;
1329                         continue;
1330                 }
1331                 /* count everything else */
1332                 count++;
1333         }
1334
1335         list_for_each_entry(wk, &local->work_list, list) {
1336                 working = true;
1337                 wk->sdata->vif.bss_conf.idle = false;
1338         }
1339
1340         if (local->scan_sdata) {
1341                 scanning = true;
1342                 local->scan_sdata->vif.bss_conf.idle = false;
1343         }
1344
1345         if (local->hw_roc_channel)
1346                 hw_roc = true;
1347
1348         list_for_each_entry(sdata, &local->interfaces, list) {
1349                 if (sdata->old_idle == sdata->vif.bss_conf.idle)
1350                         continue;
1351                 if (!ieee80211_sdata_running(sdata))
1352                         continue;
1353                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_IDLE);
1354         }
1355
1356         if (working || scanning || hw_roc)
1357                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
1358         else
1359                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
1360
1361         if (count)
1362                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
1363         else
1364                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
1365
1366         ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
1367
1368         if (hw_roc)
1369                 return ieee80211_idle_off(local, "hw remain-on-channel");
1370         if (working)
1371                 return ieee80211_idle_off(local, "working");
1372         if (scanning)
1373                 return ieee80211_idle_off(local, "scanning");
1374         if (!count)
1375                 return ieee80211_idle_on(local);
1376         else
1377                 return ieee80211_idle_off(local, "in use");
1378
1379         return 0;
1380 }
1381
1382 void ieee80211_recalc_idle(struct ieee80211_local *local)
1383 {
1384         u32 chg;
1385
1386         mutex_lock(&local->iflist_mtx);
1387         chg = __ieee80211_recalc_idle(local);
1388         mutex_unlock(&local->iflist_mtx);
1389         if (chg)
1390                 ieee80211_hw_config(local, chg);
1391 }
1392
1393 static int netdev_notify(struct notifier_block *nb,
1394                          unsigned long state,
1395                          void *ndev)
1396 {
1397         struct net_device *dev = ndev;
1398         struct ieee80211_sub_if_data *sdata;
1399
1400         if (state != NETDEV_CHANGENAME)
1401                 return 0;
1402
1403         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1404                 return 0;
1405
1406         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1407                 return 0;
1408
1409         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1410
1411         memcpy(sdata->name, dev->name, IFNAMSIZ);
1412
1413         ieee80211_debugfs_rename_netdev(sdata);
1414         return 0;
1415 }
1416
1417 static struct notifier_block mac80211_netdev_notifier = {
1418         .notifier_call = netdev_notify,
1419 };
1420
1421 int ieee80211_iface_init(void)
1422 {
1423         return register_netdevice_notifier(&mac80211_netdev_notifier);
1424 }
1425
1426 void ieee80211_iface_exit(void)
1427 {
1428         unregister_netdevice_notifier(&mac80211_netdev_notifier);
1429 }