Pileus Git - ~andy/linux/blob - 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 (!ether_addr_equal(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 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata)
 153 {
 154         int n_queues = sdata->local->hw.queues;
 155         int i;
 156
 157         for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 158                 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
 159                                  IEEE80211_INVAL_HW_QUEUE))
 160                         return -EINVAL;
 161                 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
 162                                  n_queues))
 163                         return -EINVAL;
 164         }
 165
 166         if ((sdata->vif.type != NL80211_IFTYPE_AP) ||
 167             !(sdata->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)) {
 168                 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
 169                 return 0;
 170         }
 171
 172         if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
 173                 return -EINVAL;
 174
 175         if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
 176                 return -EINVAL;
 177
 178         return 0;
 179 }
 180
 181 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
 182                                     const int offset)
 183 {
 184         struct ieee80211_local *local = sdata->local;
 185         u32 flags = sdata->u.mntr_flags;
 186
 187 #define ADJUST(_f, _s)  do {                                    \
 188         if (flags & MONITOR_FLAG_##_f)                          \
 189                 local->fif_##_s += offset;                      \
 190         } while (0)
 191
 192         ADJUST(FCSFAIL, fcsfail);
 193         ADJUST(PLCPFAIL, plcpfail);
 194         ADJUST(CONTROL, control);
 195         ADJUST(CONTROL, pspoll);
 196         ADJUST(OTHER_BSS, other_bss);
 197
 198 #undef ADJUST
 199 }
 200
 201 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
 202 {
 203         struct ieee80211_local *local = sdata->local;
 204         int i;
 205
 206         for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 207                 if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
 208                         sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
 209                 else if (local->hw.queues >= IEEE80211_NUM_ACS)
 210                         sdata->vif.hw_queue[i] = i;
 211                 else
 212                         sdata->vif.hw_queue[i] = 0;
 213         }
 214         sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
 215 }
 216
 217 static int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
 218 {
 219         struct ieee80211_sub_if_data *sdata;
 220         int ret;
 221
 222         if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
 223                 return 0;
 224
 225         if (local->monitor_sdata)
 226                 return 0;
 227
 228         sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
 229         if (!sdata)
 230                 return -ENOMEM;
 231
 232         /* set up data */
 233         sdata->local = local;
 234         sdata->vif.type = NL80211_IFTYPE_MONITOR;
 235         snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
 236                  wiphy_name(local->hw.wiphy));
 237
 238         ieee80211_set_default_queues(sdata);
 239
 240         ret = drv_add_interface(local, sdata);
 241         if (WARN_ON(ret)) {
 242                 /* ok .. stupid driver, it asked for this! */
 243                 kfree(sdata);
 244                 return ret;
 245         }
 246
 247         ret = ieee80211_check_queues(sdata);
 248         if (ret) {
 249                 kfree(sdata);
 250                 return ret;
 251         }
 252
 253         rcu_assign_pointer(local->monitor_sdata, sdata);
 254
 255         return 0;
 256 }
 257
 258 static void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
 259 {
 260         struct ieee80211_sub_if_data *sdata;
 261
 262         if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
 263                 return;
 264
 265         sdata = rtnl_dereference(local->monitor_sdata);
 266
 267         if (!sdata)
 268                 return;
 269
 270         rcu_assign_pointer(local->monitor_sdata, NULL);
 271         synchronize_net();
 272
 273         drv_remove_interface(local, sdata);
 274
 275         kfree(sdata);
 276 }
 277
 278 /*
 279  * NOTE: Be very careful when changing this function, it must NOT return
 280  * an error on interface type changes that have been pre-checked, so most
 281  * checks should be in ieee80211_check_concurrent_iface.
 282  */
 283 static int ieee80211_do_open(struct net_device *dev, bool coming_up)
 284 {
 285         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 286         struct ieee80211_local *local = sdata->local;
 287         struct sta_info *sta;
 288         u32 changed = 0;
 289         int res;
 290         u32 hw_reconf_flags = 0;
 291
 292         switch (sdata->vif.type) {
 293         case NL80211_IFTYPE_WDS:
 294                 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
 295                         return -ENOLINK;
 296                 break;
 297         case NL80211_IFTYPE_AP_VLAN: {
 298                 struct ieee80211_sub_if_data *master;
 299
 300                 if (!sdata->bss)
 301                         return -ENOLINK;
 302
 303                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
 304
 305                 master = container_of(sdata->bss,
 306                                       struct ieee80211_sub_if_data, u.ap);
 307                 sdata->control_port_protocol =
 308                         master->control_port_protocol;
 309                 sdata->control_port_no_encrypt =
 310                         master->control_port_no_encrypt;
 311                 break;
 312                 }
 313         case NL80211_IFTYPE_AP:
 314                 sdata->bss = &sdata->u.ap;
 315                 break;
 316         case NL80211_IFTYPE_MESH_POINT:
 317         case NL80211_IFTYPE_STATION:
 318         case NL80211_IFTYPE_MONITOR:
 319         case NL80211_IFTYPE_ADHOC:
 320                 /* no special treatment */
 321                 break;
 322         case NL80211_IFTYPE_UNSPECIFIED:
 323         case NUM_NL80211_IFTYPES:
 324         case NL80211_IFTYPE_P2P_CLIENT:
 325         case NL80211_IFTYPE_P2P_GO:
 326                 /* cannot happen */
 327                 WARN_ON(1);
 328                 break;
 329         }
 330
 331         if (local->open_count == 0) {
 332                 res = drv_start(local);
 333                 if (res)
 334                         goto err_del_bss;
 335                 if (local->ops->napi_poll)
 336                         napi_enable(&local->napi);
 337                 /* we're brought up, everything changes */
 338                 hw_reconf_flags = ~0;
 339                 ieee80211_led_radio(local, true);
 340                 ieee80211_mod_tpt_led_trig(local,
 341                                            IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
 342         }
 343
 344         /*
 345          * Copy the hopefully now-present MAC address to
 346          * this interface, if it has the special null one.
 347          */
 348         if (is_zero_ether_addr(dev->dev_addr)) {
 349                 memcpy(dev->dev_addr,
 350                        local->hw.wiphy->perm_addr,
 351                        ETH_ALEN);
 352                 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
 353
 354                 if (!is_valid_ether_addr(dev->dev_addr)) {
 355                         res = -EADDRNOTAVAIL;
 356                         goto err_stop;
 357                 }
 358         }
 359
 360         switch (sdata->vif.type) {
 361         case NL80211_IFTYPE_AP_VLAN:
 362                 /* no need to tell driver, but set carrier */
 363                 if (rtnl_dereference(sdata->bss->beacon))
 364                         netif_carrier_on(dev);
 365                 else
 366                         netif_carrier_off(dev);
 367                 break;
 368         case NL80211_IFTYPE_MONITOR:
 369                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 370                         local->cooked_mntrs++;
 371                         break;
 372                 }
 373
 374                 if (local->monitors == 0 && local->open_count == 0) {
 375                         res = ieee80211_add_virtual_monitor(local);
 376                         if (res)
 377                                 goto err_stop;
 378                 }
 379
 380                 /* must be before the call to ieee80211_configure_filter */
 381                 local->monitors++;
 382                 if (local->monitors == 1) {
 383                         local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
 384                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 385                 }
 386
 387                 ieee80211_adjust_monitor_flags(sdata, 1);
 388                 ieee80211_configure_filter(local);
 389
 390                 netif_carrier_on(dev);
 391                 break;
 392         default:
 393                 if (coming_up) {
 394                         ieee80211_del_virtual_monitor(local);
 395
 396                         res = drv_add_interface(local, sdata);
 397                         if (res)
 398                                 goto err_stop;
 399                         res = ieee80211_check_queues(sdata);
 400                         if (res)
 401                                 goto err_del_interface;
 402                 }
 403
 404                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
 405                         local->fif_pspoll++;
 406                         local->fif_probe_req++;
 407
 408                         ieee80211_configure_filter(local);
 409                 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 410                         local->fif_probe_req++;
 411                 }
 412
 413                 changed |= ieee80211_reset_erp_info(sdata);
 414                 ieee80211_bss_info_change_notify(sdata, changed);
 415
 416                 if (sdata->vif.type == NL80211_IFTYPE_STATION ||
 417                     sdata->vif.type == NL80211_IFTYPE_ADHOC ||
 418                     sdata->vif.type == NL80211_IFTYPE_AP)
 419                         netif_carrier_off(dev);
 420                 else
 421                         netif_carrier_on(dev);
 422
 423                 /*
 424                  * set default queue parameters so drivers don't
 425                  * need to initialise the hardware if the hardware
 426                  * doesn't start up with sane defaults
 427                  */
 428                 ieee80211_set_wmm_default(sdata, true);
 429         }
 430
 431         set_bit(SDATA_STATE_RUNNING, &sdata->state);
 432
 433         if (sdata->vif.type == NL80211_IFTYPE_WDS) {
 434                 /* Create STA entry for the WDS peer */
 435                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
 436                                      GFP_KERNEL);
 437                 if (!sta) {
 438                         res = -ENOMEM;
 439                         goto err_del_interface;
 440                 }
 441
 442                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
 443                 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
 444                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
 445
 446                 res = sta_info_insert(sta);
 447                 if (res) {
 448                         /* STA has been freed */
 449                         goto err_del_interface;
 450                 }
 451
 452                 rate_control_rate_init(sta);
 453         }
 454
 455         /*
 456          * set_multicast_list will be invoked by the networking core
 457          * which will check whether any increments here were done in
 458          * error and sync them down to the hardware as filter flags.
 459          */
 460         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 461                 atomic_inc(&local->iff_allmultis);
 462
 463         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 464                 atomic_inc(&local->iff_promiscs);
 465
 466         mutex_lock(&local->mtx);
 467         hw_reconf_flags |= __ieee80211_recalc_idle(local);
 468         mutex_unlock(&local->mtx);
 469
 470         if (coming_up)
 471                 local->open_count++;
 472
 473         if (hw_reconf_flags)
 474                 ieee80211_hw_config(local, hw_reconf_flags);
 475
 476         ieee80211_recalc_ps(local, -1);
 477
 478         netif_tx_start_all_queues(dev);
 479
 480         return 0;
 481  err_del_interface:
 482         drv_remove_interface(local, sdata);
 483  err_stop:
 484         if (!local->open_count)
 485                 drv_stop(local);
 486  err_del_bss:
 487         sdata->bss = NULL;
 488         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
 489                 list_del(&sdata->u.vlan.list);
 490         /* might already be clear but that doesn't matter */
 491         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 492         return res;
 493 }
 494
 495 static int ieee80211_open(struct net_device *dev)
 496 {
 497         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 498         int err;
 499
 500         /* fail early if user set an invalid address */
 501         if (!is_valid_ether_addr(dev->dev_addr))
 502                 return -EADDRNOTAVAIL;
 503
 504         err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
 505         if (err)
 506                 return err;
 507
 508         return ieee80211_do_open(dev, true);
 509 }
 510
 511 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
 512                               bool going_down)
 513 {
 514         struct ieee80211_local *local = sdata->local;
 515         unsigned long flags;
 516         struct sk_buff *skb, *tmp;
 517         u32 hw_reconf_flags = 0;
 518         int i;
 519         enum nl80211_channel_type orig_ct;
 520
 521         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 522
 523         if (local->scan_sdata == sdata)
 524                 ieee80211_scan_cancel(local);
 525
 526         /*
 527          * Stop TX on this interface first.
 528          */
 529         netif_tx_stop_all_queues(sdata->dev);
 530
 531         /*
 532          * Purge work for this interface.
 533          */
 534         ieee80211_work_purge(sdata);
 535
 536         /*
 537          * Remove all stations associated with this interface.
 538          *
 539          * This must be done before calling ops->remove_interface()
 540          * because otherwise we can later invoke ops->sta_notify()
 541          * whenever the STAs are removed, and that invalidates driver
 542          * assumptions about always getting a vif pointer that is valid
 543          * (because if we remove a STA after ops->remove_interface()
 544          * the driver will have removed the vif info already!)
 545          *
 546          * This is relevant only in AP, WDS and mesh modes, since in
 547          * all other modes we've already removed all stations when
 548          * disconnecting etc.
 549          */
 550         sta_info_flush(local, sdata);
 551
 552         /*
 553          * Don't count this interface for promisc/allmulti while it
 554          * is down. dev_mc_unsync() will invoke set_multicast_list
 555          * on the master interface which will sync these down to the
 556          * hardware as filter flags.
 557          */
 558         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 559                 atomic_dec(&local->iff_allmultis);
 560
 561         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 562                 atomic_dec(&local->iff_promiscs);
 563
 564         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 565                 local->fif_pspoll--;
 566                 local->fif_probe_req--;
 567         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 568                 local->fif_probe_req--;
 569         }
 570
 571         netif_addr_lock_bh(sdata->dev);
 572         spin_lock_bh(&local->filter_lock);
 573         __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
 574                          sdata->dev->addr_len);
 575         spin_unlock_bh(&local->filter_lock);
 576         netif_addr_unlock_bh(sdata->dev);
 577
 578         ieee80211_configure_filter(local);
 579
 580         del_timer_sync(&local->dynamic_ps_timer);
 581         cancel_work_sync(&local->dynamic_ps_enable_work);
 582
 583         /* APs need special treatment */
 584         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 585                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
 586                 struct beacon_data *old_beacon =
 587                         rtnl_dereference(sdata->u.ap.beacon);
 588                 struct sk_buff *old_probe_resp =
 589                         rtnl_dereference(sdata->u.ap.probe_resp);
 590
 591                 /* sdata_running will return false, so this will disable */
 592                 ieee80211_bss_info_change_notify(sdata,
 593                                                  BSS_CHANGED_BEACON_ENABLED);
 594
 595                 /* remove beacon and probe response */
 596                 RCU_INIT_POINTER(sdata->u.ap.beacon, NULL);
 597                 RCU_INIT_POINTER(sdata->u.ap.probe_resp, NULL);
 598                 synchronize_rcu();
 599                 kfree(old_beacon);
 600                 kfree_skb(old_probe_resp);
 601
 602                 /* down all dependent devices, that is VLANs */
 603                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
 604                                          u.vlan.list)
 605                         dev_close(vlan->dev);
 606                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
 607
 608                 /* free all potentially still buffered bcast frames */
 609                 local->total_ps_buffered -= skb_queue_len(&sdata->u.ap.ps_bc_buf);
 610                 skb_queue_purge(&sdata->u.ap.ps_bc_buf);
 611         } else if (sdata->vif.type == NL80211_IFTYPE_STATION) {
 612                 ieee80211_mgd_stop(sdata);
 613         }
 614
 615         if (going_down)
 616                 local->open_count--;
 617
 618         switch (sdata->vif.type) {
 619         case NL80211_IFTYPE_AP_VLAN:
 620                 list_del(&sdata->u.vlan.list);
 621                 /* no need to tell driver */
 622                 break;
 623         case NL80211_IFTYPE_MONITOR:
 624                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 625                         local->cooked_mntrs--;
 626                         break;
 627                 }
 628
 629                 local->monitors--;
 630                 if (local->monitors == 0) {
 631                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
 632                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 633                         ieee80211_del_virtual_monitor(local);
 634                 }
 635
 636                 ieee80211_adjust_monitor_flags(sdata, -1);
 637                 ieee80211_configure_filter(local);
 638                 break;
 639         default:
 640                 mutex_lock(&local->mtx);
 641                 if (local->hw_roc_dev == sdata->dev &&
 642                     local->hw_roc_channel) {
 643                         /* ignore return value since this is racy */
 644                         drv_cancel_remain_on_channel(local);
 645                         ieee80211_queue_work(&local->hw, &local->hw_roc_done);
 646                 }
 647                 mutex_unlock(&local->mtx);
 648
 649                 flush_work(&local->hw_roc_start);
 650                 flush_work(&local->hw_roc_done);
 651
 652                 flush_work(&sdata->work);
 653                 /*
 654                  * When we get here, the interface is marked down.
 655                  * Call synchronize_rcu() to wait for the RX path
 656                  * should it be using the interface and enqueuing
 657                  * frames at this very time on another CPU.
 658                  */
 659                 synchronize_rcu();
 660                 skb_queue_purge(&sdata->skb_queue);
 661
 662                 /*
 663                  * Disable beaconing here for mesh only, AP and IBSS
 664                  * are already taken care of.
 665                  */
 666                 if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
 667                         ieee80211_bss_info_change_notify(sdata,
 668                                 BSS_CHANGED_BEACON_ENABLED);
 669
 670                 /*
 671                  * Free all remaining keys, there shouldn't be any,
 672                  * except maybe group keys in AP more or WDS?
 673                  */
 674                 ieee80211_free_keys(sdata);
 675
 676                 if (going_down)
 677                         drv_remove_interface(local, sdata);
 678         }
 679
 680         sdata->bss = NULL;
 681
 682         mutex_lock(&local->mtx);
 683         hw_reconf_flags |= __ieee80211_recalc_idle(local);
 684         mutex_unlock(&local->mtx);
 685
 686         ieee80211_recalc_ps(local, -1);
 687
 688         if (local->open_count == 0) {
 689                 if (local->ops->napi_poll)
 690                         napi_disable(&local->napi);
 691                 ieee80211_clear_tx_pending(local);
 692                 ieee80211_stop_device(local);
 693
 694                 /* no reconfiguring after stop! */
 695                 hw_reconf_flags = 0;
 696         }
 697
 698         /* Re-calculate channel-type, in case there are multiple vifs
 699          * on different channel types.
 700          */
 701         orig_ct = local->_oper_channel_type;
 702         ieee80211_set_channel_type(local, NULL, NL80211_CHAN_NO_HT);
 703
 704         /* do after stop to avoid reconfiguring when we stop anyway */
 705         if (hw_reconf_flags || (orig_ct != local->_oper_channel_type))
 706                 ieee80211_hw_config(local, hw_reconf_flags);
 707
 708         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 709         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 710                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
 711                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 712                         if (info->control.vif == &sdata->vif) {
 713                                 __skb_unlink(skb, &local->pending[i]);
 714                                 dev_kfree_skb_irq(skb);
 715                         }
 716                 }
 717         }
 718         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 719
 720         if (local->monitors == local->open_count && local->monitors > 0)
 721                 ieee80211_add_virtual_monitor(local);
 722 }
 723
 724 static int ieee80211_stop(struct net_device *dev)
 725 {
 726         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 727
 728         ieee80211_do_stop(sdata, true);
 729
 730         return 0;
 731 }
 732
 733 static void ieee80211_set_multicast_list(struct net_device *dev)
 734 {
 735         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 736         struct ieee80211_local *local = sdata->local;
 737         int allmulti, promisc, sdata_allmulti, sdata_promisc;
 738
 739         allmulti = !!(dev->flags & IFF_ALLMULTI);
 740         promisc = !!(dev->flags & IFF_PROMISC);
 741         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
 742         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
 743
 744         if (allmulti != sdata_allmulti) {
 745                 if (dev->flags & IFF_ALLMULTI)
 746                         atomic_inc(&local->iff_allmultis);
 747                 else
 748                         atomic_dec(&local->iff_allmultis);
 749                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
 750         }
 751
 752         if (promisc != sdata_promisc) {
 753                 if (dev->flags & IFF_PROMISC)
 754                         atomic_inc(&local->iff_promiscs);
 755                 else
 756                         atomic_dec(&local->iff_promiscs);
 757                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
 758         }
 759         spin_lock_bh(&local->filter_lock);
 760         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
 761         spin_unlock_bh(&local->filter_lock);
 762         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
 763 }
 764
 765 /*
 766  * Called when the netdev is removed or, by the code below, before
 767  * the interface type changes.
 768  */
 769 static void ieee80211_teardown_sdata(struct net_device *dev)
 770 {
 771         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 772         struct ieee80211_local *local = sdata->local;
 773         int flushed;
 774         int i;
 775
 776         /* free extra data */
 777         ieee80211_free_keys(sdata);
 778
 779         ieee80211_debugfs_remove_netdev(sdata);
 780
 781         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
 782                 __skb_queue_purge(&sdata->fragments[i].skb_list);
 783         sdata->fragment_next = 0;
 784
 785         if (ieee80211_vif_is_mesh(&sdata->vif))
 786                 mesh_rmc_free(sdata);
 787
 788         flushed = sta_info_flush(local, sdata);
 789         WARN_ON(flushed);
 790 }
 791
 792 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
 793                                          struct sk_buff *skb)
 794 {
 795         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
 796 }
 797
 798 static const struct net_device_ops ieee80211_dataif_ops = {
 799         .ndo_open               = ieee80211_open,
 800         .ndo_stop               = ieee80211_stop,
 801         .ndo_uninit             = ieee80211_teardown_sdata,
 802         .ndo_start_xmit         = ieee80211_subif_start_xmit,
 803         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
 804         .ndo_change_mtu         = ieee80211_change_mtu,
 805         .ndo_set_mac_address    = ieee80211_change_mac,
 806         .ndo_select_queue       = ieee80211_netdev_select_queue,
 807 };
 808
 809 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
 810                                           struct sk_buff *skb)
 811 {
 812         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 813         struct ieee80211_local *local = sdata->local;
 814         struct ieee80211_hdr *hdr;
 815         struct ieee80211_radiotap_header *rtap = (void *)skb->data;
 816
 817         if (local->hw.queues < IEEE80211_NUM_ACS)
 818                 return 0;
 819
 820         if (skb->len < 4 ||
 821             skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
 822                 return 0; /* doesn't matter, frame will be dropped */
 823
 824         hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
 825
 826         return ieee80211_select_queue_80211(local, skb, hdr);
 827 }
 828
 829 static const struct net_device_ops ieee80211_monitorif_ops = {
 830         .ndo_open               = ieee80211_open,
 831         .ndo_stop               = ieee80211_stop,
 832         .ndo_uninit             = ieee80211_teardown_sdata,
 833         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
 834         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
 835         .ndo_change_mtu         = ieee80211_change_mtu,
 836         .ndo_set_mac_address    = eth_mac_addr,
 837         .ndo_select_queue       = ieee80211_monitor_select_queue,
 838 };
 839
 840 static void ieee80211_if_setup(struct net_device *dev)
 841 {
 842         ether_setup(dev);
 843         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
 844         dev->netdev_ops = &ieee80211_dataif_ops;
 845         dev->destructor = free_netdev;
 846 }
 847
 848 static void ieee80211_iface_work(struct work_struct *work)
 849 {
 850         struct ieee80211_sub_if_data *sdata =
 851                 container_of(work, struct ieee80211_sub_if_data, work);
 852         struct ieee80211_local *local = sdata->local;
 853         struct sk_buff *skb;
 854         struct sta_info *sta;
 855         struct ieee80211_ra_tid *ra_tid;
 856
 857         if (!ieee80211_sdata_running(sdata))
 858                 return;
 859
 860         if (local->scanning)
 861                 return;
 862
 863         /*
 864          * ieee80211_queue_work() should have picked up most cases,
 865          * here we'll pick the rest.
 866          */
 867         if (WARN(local->suspended,
 868                  "interface work scheduled while going to suspend\n"))
 869                 return;
 870
 871         /* first process frames */
 872         while ((skb = skb_dequeue(&sdata->skb_queue))) {
 873                 struct ieee80211_mgmt *mgmt = (void *)skb->data;
 874
 875                 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
 876                         ra_tid = (void *)&skb->cb;
 877                         ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
 878                                                  ra_tid->tid);
 879                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
 880                         ra_tid = (void *)&skb->cb;
 881                         ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
 882                                                 ra_tid->tid);
 883                 } else if (ieee80211_is_action(mgmt->frame_control) &&
 884                            mgmt->u.action.category == WLAN_CATEGORY_BACK) {
 885                         int len = skb->len;
 886
 887                         mutex_lock(&local->sta_mtx);
 888                         sta = sta_info_get_bss(sdata, mgmt->sa);
 889                         if (sta) {
 890                                 switch (mgmt->u.action.u.addba_req.action_code) {
 891                                 case WLAN_ACTION_ADDBA_REQ:
 892                                         ieee80211_process_addba_request(
 893                                                         local, sta, mgmt, len);
 894                                         break;
 895                                 case WLAN_ACTION_ADDBA_RESP:
 896                                         ieee80211_process_addba_resp(local, sta,
 897                                                                      mgmt, len);
 898                                         break;
 899                                 case WLAN_ACTION_DELBA:
 900                                         ieee80211_process_delba(sdata, sta,
 901                                                                 mgmt, len);
 902                                         break;
 903                                 default:
 904                                         WARN_ON(1);
 905                                         break;
 906                                 }
 907                         }
 908                         mutex_unlock(&local->sta_mtx);
 909                 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
 910                         struct ieee80211_hdr *hdr = (void *)mgmt;
 911                         /*
 912                          * So the frame isn't mgmt, but frame_control
 913                          * is at the right place anyway, of course, so
 914                          * the if statement is correct.
 915                          *
 916                          * Warn if we have other data frame types here,
 917                          * they must not get here.
 918                          */
 919                         WARN_ON(hdr->frame_control &
 920                                         cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
 921                         WARN_ON(!(hdr->seq_ctrl &
 922                                         cpu_to_le16(IEEE80211_SCTL_FRAG)));
 923                         /*
 924                          * This was a fragment of a frame, received while
 925                          * a block-ack session was active. That cannot be
 926                          * right, so terminate the session.
 927                          */
 928                         mutex_lock(&local->sta_mtx);
 929                         sta = sta_info_get_bss(sdata, mgmt->sa);
 930                         if (sta) {
 931                                 u16 tid = *ieee80211_get_qos_ctl(hdr) &
 932                                                 IEEE80211_QOS_CTL_TID_MASK;
 933
 934                                 __ieee80211_stop_rx_ba_session(
 935                                         sta, tid, WLAN_BACK_RECIPIENT,
 936                                         WLAN_REASON_QSTA_REQUIRE_SETUP,
 937                                         true);
 938                         }
 939                         mutex_unlock(&local->sta_mtx);
 940                 } else switch (sdata->vif.type) {
 941                 case NL80211_IFTYPE_STATION:
 942                         ieee80211_sta_rx_queued_mgmt(sdata, skb);
 943                         break;
 944                 case NL80211_IFTYPE_ADHOC:
 945                         ieee80211_ibss_rx_queued_mgmt(sdata, skb);
 946                         break;
 947                 case NL80211_IFTYPE_MESH_POINT:
 948                         if (!ieee80211_vif_is_mesh(&sdata->vif))
 949                                 break;
 950                         ieee80211_mesh_rx_queued_mgmt(sdata, skb);
 951                         break;
 952                 default:
 953                         WARN(1, "frame for unexpected interface type");
 954                         break;
 955                 }
 956
 957                 kfree_skb(skb);
 958         }
 959
 960         /* then other type-dependent work */
 961         switch (sdata->vif.type) {
 962         case NL80211_IFTYPE_STATION:
 963                 ieee80211_sta_work(sdata);
 964                 break;
 965         case NL80211_IFTYPE_ADHOC:
 966                 ieee80211_ibss_work(sdata);
 967                 break;
 968         case NL80211_IFTYPE_MESH_POINT:
 969                 if (!ieee80211_vif_is_mesh(&sdata->vif))
 970                         break;
 971                 ieee80211_mesh_work(sdata);
 972                 break;
 973         default:
 974                 break;
 975         }
 976 }
 977
 978
 979 /*
 980  * Helper function to initialise an interface to a specific type.
 981  */
 982 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
 983                                   enum nl80211_iftype type)
 984 {
 985         /* clear type-dependent union */
 986         memset(&sdata->u, 0, sizeof(sdata->u));
 987
 988         /* and set some type-dependent values */
 989         sdata->vif.type = type;
 990         sdata->vif.p2p = false;
 991         sdata->dev->netdev_ops = &ieee80211_dataif_ops;
 992         sdata->wdev.iftype = type;
 993
 994         sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
 995         sdata->control_port_no_encrypt = false;
 996
 997         sdata->noack_map = 0;
 998
 999         /* only monitor differs */
1000         sdata->dev->type = ARPHRD_ETHER;
1001
1002         skb_queue_head_init(&sdata->skb_queue);
1003         INIT_WORK(&sdata->work, ieee80211_iface_work);
1004
1005         switch (type) {
1006         case NL80211_IFTYPE_P2P_GO:
1007                 type = NL80211_IFTYPE_AP;
1008                 sdata->vif.type = type;
1009                 sdata->vif.p2p = true;
1010                 /* fall through */
1011         case NL80211_IFTYPE_AP:
1012                 skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
1013                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1014                 break;
1015         case NL80211_IFTYPE_P2P_CLIENT:
1016                 type = NL80211_IFTYPE_STATION;
1017                 sdata->vif.type = type;
1018                 sdata->vif.p2p = true;
1019                 /* fall through */
1020         case NL80211_IFTYPE_STATION:
1021                 ieee80211_sta_setup_sdata(sdata);
1022                 break;
1023         case NL80211_IFTYPE_ADHOC:
1024                 ieee80211_ibss_setup_sdata(sdata);
1025                 break;
1026         case NL80211_IFTYPE_MESH_POINT:
1027                 if (ieee80211_vif_is_mesh(&sdata->vif))
1028                         ieee80211_mesh_init_sdata(sdata);
1029                 break;
1030         case NL80211_IFTYPE_MONITOR:
1031                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1032                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1033                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
1034                                       MONITOR_FLAG_OTHER_BSS;
1035                 break;
1036         case NL80211_IFTYPE_WDS:
1037         case NL80211_IFTYPE_AP_VLAN:
1038                 break;
1039         case NL80211_IFTYPE_UNSPECIFIED:
1040         case NUM_NL80211_IFTYPES:
1041                 BUG();
1042                 break;
1043         }
1044
1045         ieee80211_debugfs_add_netdev(sdata);
1046 }
1047
1048 static void ieee80211_clean_sdata(struct ieee80211_sub_if_data *sdata)
1049 {
1050         switch (sdata->vif.type) {
1051         case NL80211_IFTYPE_MESH_POINT:
1052                 mesh_path_flush_by_iface(sdata);
1053                 break;
1054
1055         default:
1056                 break;
1057         }
1058 }
1059
1060 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1061                                            enum nl80211_iftype type)
1062 {
1063         struct ieee80211_local *local = sdata->local;
1064         int ret, err;
1065         enum nl80211_iftype internal_type = type;
1066         bool p2p = false;
1067
1068         ASSERT_RTNL();
1069
1070         if (!local->ops->change_interface)
1071                 return -EBUSY;
1072
1073         switch (sdata->vif.type) {
1074         case NL80211_IFTYPE_AP:
1075         case NL80211_IFTYPE_STATION:
1076         case NL80211_IFTYPE_ADHOC:
1077                 /*
1078                  * Could maybe also all others here?
1079                  * Just not sure how that interacts
1080                  * with the RX/config path e.g. for
1081                  * mesh.
1082                  */
1083                 break;
1084         default:
1085                 return -EBUSY;
1086         }
1087
1088         switch (type) {
1089         case NL80211_IFTYPE_AP:
1090         case NL80211_IFTYPE_STATION:
1091         case NL80211_IFTYPE_ADHOC:
1092                 /*
1093                  * Could probably support everything
1094                  * but WDS here (WDS do_open can fail
1095                  * under memory pressure, which this
1096                  * code isn't prepared to handle).
1097                  */
1098                 break;
1099         case NL80211_IFTYPE_P2P_CLIENT:
1100                 p2p = true;
1101                 internal_type = NL80211_IFTYPE_STATION;
1102                 break;
1103         case NL80211_IFTYPE_P2P_GO:
1104                 p2p = true;
1105                 internal_type = NL80211_IFTYPE_AP;
1106                 break;
1107         default:
1108                 return -EBUSY;
1109         }
1110
1111         ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1112         if (ret)
1113                 return ret;
1114
1115         ieee80211_do_stop(sdata, false);
1116
1117         ieee80211_teardown_sdata(sdata->dev);
1118
1119         ret = drv_change_interface(local, sdata, internal_type, p2p);
1120         if (ret)
1121                 type = sdata->vif.type;
1122
1123         /*
1124          * Ignore return value here, there's not much we can do since
1125          * the driver changed the interface type internally already.
1126          * The warnings will hopefully make driver authors fix it :-)
1127          */
1128         ieee80211_check_queues(sdata);
1129
1130         ieee80211_setup_sdata(sdata, type);
1131
1132         err = ieee80211_do_open(sdata->dev, false);
1133         WARN(err, "type change: do_open returned %d", err);
1134
1135         return ret;
1136 }
1137
1138 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1139                              enum nl80211_iftype type)
1140 {
1141         int ret;
1142
1143         ASSERT_RTNL();
1144
1145         if (type == ieee80211_vif_type_p2p(&sdata->vif))
1146                 return 0;
1147
1148         /* Setting ad-hoc mode on non-IBSS channel is not supported. */
1149         if (sdata->local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS &&
1150             type == NL80211_IFTYPE_ADHOC)
1151                 return -EOPNOTSUPP;
1152
1153         if (ieee80211_sdata_running(sdata)) {
1154                 ret = ieee80211_runtime_change_iftype(sdata, type);
1155                 if (ret)
1156                         return ret;
1157         } else {
1158                 /* Purge and reset type-dependent state. */
1159                 ieee80211_teardown_sdata(sdata->dev);
1160                 ieee80211_setup_sdata(sdata, type);
1161         }
1162
1163         /* reset some values that shouldn't be kept across type changes */
1164         sdata->vif.bss_conf.basic_rates =
1165                 ieee80211_mandatory_rates(sdata->local,
1166                         sdata->local->hw.conf.channel->band);
1167         sdata->drop_unencrypted = 0;
1168         if (type == NL80211_IFTYPE_STATION)
1169                 sdata->u.mgd.use_4addr = false;
1170
1171         return 0;
1172 }
1173
1174 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1175                                        struct net_device *dev,
1176                                        enum nl80211_iftype type)
1177 {
1178         struct ieee80211_sub_if_data *sdata;
1179         u64 mask, start, addr, val, inc;
1180         u8 *m;
1181         u8 tmp_addr[ETH_ALEN];
1182         int i;
1183
1184         /* default ... something at least */
1185         memcpy(dev->perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1186
1187         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1188             local->hw.wiphy->n_addresses <= 1)
1189                 return;
1190
1191
1192         mutex_lock(&local->iflist_mtx);
1193
1194         switch (type) {
1195         case NL80211_IFTYPE_MONITOR:
1196                 /* doesn't matter */
1197                 break;
1198         case NL80211_IFTYPE_WDS:
1199         case NL80211_IFTYPE_AP_VLAN:
1200                 /* match up with an AP interface */
1201                 list_for_each_entry(sdata, &local->interfaces, list) {
1202                         if (sdata->vif.type != NL80211_IFTYPE_AP)
1203                                 continue;
1204                         memcpy(dev->perm_addr, sdata->vif.addr, ETH_ALEN);
1205                         break;
1206                 }
1207                 /* keep default if no AP interface present */
1208                 break;
1209         default:
1210                 /* assign a new address if possible -- try n_addresses first */
1211                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1212                         bool used = false;
1213
1214                         list_for_each_entry(sdata, &local->interfaces, list) {
1215                                 if (memcmp(local->hw.wiphy->addresses[i].addr,
1216                                            sdata->vif.addr, ETH_ALEN) == 0) {
1217                                         used = true;
1218                                         break;
1219                                 }
1220                         }
1221
1222                         if (!used) {
1223                                 memcpy(dev->perm_addr,
1224                                        local->hw.wiphy->addresses[i].addr,
1225                                        ETH_ALEN);
1226                                 break;
1227                         }
1228                 }
1229
1230                 /* try mask if available */
1231                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1232                         break;
1233
1234                 m = local->hw.wiphy->addr_mask;
1235                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1236                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1237                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1238
1239                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1240                         /* not a contiguous mask ... not handled now! */
1241                         printk(KERN_DEBUG "not contiguous\n");
1242                         break;
1243                 }
1244
1245                 m = local->hw.wiphy->perm_addr;
1246                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1247                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1248                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1249
1250                 inc = 1ULL<<__ffs64(mask);
1251                 val = (start & mask);
1252                 addr = (start & ~mask) | (val & mask);
1253                 do {
1254                         bool used = false;
1255
1256                         tmp_addr[5] = addr >> 0*8;
1257                         tmp_addr[4] = addr >> 1*8;
1258                         tmp_addr[3] = addr >> 2*8;
1259                         tmp_addr[2] = addr >> 3*8;
1260                         tmp_addr[1] = addr >> 4*8;
1261                         tmp_addr[0] = addr >> 5*8;
1262
1263                         val += inc;
1264
1265                         list_for_each_entry(sdata, &local->interfaces, list) {
1266                                 if (memcmp(tmp_addr, sdata->vif.addr,
1267                                                         ETH_ALEN) == 0) {
1268                                         used = true;
1269                                         break;
1270                                 }
1271                         }
1272
1273                         if (!used) {
1274                                 memcpy(dev->perm_addr, tmp_addr, ETH_ALEN);
1275                                 break;
1276                         }
1277                         addr = (start & ~mask) | (val & mask);
1278                 } while (addr != start);
1279
1280                 break;
1281         }
1282
1283         mutex_unlock(&local->iflist_mtx);
1284 }
1285
1286 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1287                      struct net_device **new_dev, enum nl80211_iftype type,
1288                      struct vif_params *params)
1289 {
1290         struct net_device *ndev;
1291         struct ieee80211_sub_if_data *sdata = NULL;
1292         int ret, i;
1293         int txqs = 1;
1294
1295         ASSERT_RTNL();
1296
1297         if (local->hw.queues >= IEEE80211_NUM_ACS)
1298                 txqs = IEEE80211_NUM_ACS;
1299
1300         ndev = alloc_netdev_mqs(sizeof(*sdata) + local->hw.vif_data_size,
1301                                 name, ieee80211_if_setup, txqs, 1);
1302         if (!ndev)
1303                 return -ENOMEM;
1304         dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1305
1306         ndev->needed_headroom = local->tx_headroom +
1307                                 4*6 /* four MAC addresses */
1308                                 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1309                                 + 6 /* mesh */
1310                                 + 8 /* rfc1042/bridge tunnel */
1311                                 - ETH_HLEN /* ethernet hard_header_len */
1312                                 + IEEE80211_ENCRYPT_HEADROOM;
1313         ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1314
1315         ret = dev_alloc_name(ndev, ndev->name);
1316         if (ret < 0)
1317                 goto fail;
1318
1319         ieee80211_assign_perm_addr(local, ndev, type);
1320         memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1321         SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1322
1323         /* don't use IEEE80211_DEV_TO_SUB_IF because it checks too much */
1324         sdata = netdev_priv(ndev);
1325         ndev->ieee80211_ptr = &sdata->wdev;
1326         memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1327         memcpy(sdata->name, ndev->name, IFNAMSIZ);
1328
1329         /* initialise type-independent data */
1330         sdata->wdev.wiphy = local->hw.wiphy;
1331         sdata->local = local;
1332         sdata->dev = ndev;
1333 #ifdef CONFIG_INET
1334         sdata->arp_filter_state = true;
1335 #endif
1336
1337         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1338                 skb_queue_head_init(&sdata->fragments[i].skb_list);
1339
1340         INIT_LIST_HEAD(&sdata->key_list);
1341
1342         for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1343                 struct ieee80211_supported_band *sband;
1344                 sband = local->hw.wiphy->bands[i];
1345                 sdata->rc_rateidx_mask[i] =
1346                         sband ? (1 << sband->n_bitrates) - 1 : 0;
1347                 if (sband)
1348                         memcpy(sdata->rc_rateidx_mcs_mask[i],
1349                                sband->ht_cap.mcs.rx_mask,
1350                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1351                 else
1352                         memset(sdata->rc_rateidx_mcs_mask[i], 0,
1353                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1354         }
1355
1356         ieee80211_set_default_queues(sdata);
1357
1358         /* setup type-dependent data */
1359         ieee80211_setup_sdata(sdata, type);
1360
1361         if (params) {
1362                 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1363                 if (type == NL80211_IFTYPE_STATION)
1364                         sdata->u.mgd.use_4addr = params->use_4addr;
1365         }
1366
1367         ret = register_netdevice(ndev);
1368         if (ret)
1369                 goto fail;
1370
1371         mutex_lock(&local->iflist_mtx);
1372         list_add_tail_rcu(&sdata->list, &local->interfaces);
1373         mutex_unlock(&local->iflist_mtx);
1374
1375         if (new_dev)
1376                 *new_dev = ndev;
1377
1378         return 0;
1379
1380  fail:
1381         free_netdev(ndev);
1382         return ret;
1383 }
1384
1385 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1386 {
1387         ASSERT_RTNL();
1388
1389         mutex_lock(&sdata->local->iflist_mtx);
1390         list_del_rcu(&sdata->list);
1391         mutex_unlock(&sdata->local->iflist_mtx);
1392
1393         /* clean up type-dependent data */
1394         ieee80211_clean_sdata(sdata);
1395
1396         synchronize_rcu();
1397         unregister_netdevice(sdata->dev);
1398 }
1399
1400 /*
1401  * Remove all interfaces, may only be called at hardware unregistration
1402  * time because it doesn't do RCU-safe list removals.
1403  */
1404 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1405 {
1406         struct ieee80211_sub_if_data *sdata, *tmp;
1407         LIST_HEAD(unreg_list);
1408
1409         ASSERT_RTNL();
1410
1411         mutex_lock(&local->iflist_mtx);
1412         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1413                 list_del(&sdata->list);
1414
1415                 ieee80211_clean_sdata(sdata);
1416
1417                 unregister_netdevice_queue(sdata->dev, &unreg_list);
1418         }
1419         mutex_unlock(&local->iflist_mtx);
1420         unregister_netdevice_many(&unreg_list);
1421         list_del(&unreg_list);
1422 }
1423
1424 static u32 ieee80211_idle_off(struct ieee80211_local *local,
1425                               const char *reason)
1426 {
1427         if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
1428                 return 0;
1429
1430 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1431         wiphy_debug(local->hw.wiphy, "device no longer idle - %s\n", reason);
1432 #endif
1433
1434         local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
1435         return IEEE80211_CONF_CHANGE_IDLE;
1436 }
1437
1438 static u32 ieee80211_idle_on(struct ieee80211_local *local)
1439 {
1440         if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
1441                 return 0;
1442
1443 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1444         wiphy_debug(local->hw.wiphy, "device now idle\n");
1445 #endif
1446
1447         drv_flush(local, false);
1448
1449         local->hw.conf.flags |= IEEE80211_CONF_IDLE;
1450         return IEEE80211_CONF_CHANGE_IDLE;
1451 }
1452
1453 u32 __ieee80211_recalc_idle(struct ieee80211_local *local)
1454 {
1455         struct ieee80211_sub_if_data *sdata;
1456         int count = 0;
1457         bool working = false, scanning = false, hw_roc = false;
1458         struct ieee80211_work *wk;
1459         unsigned int led_trig_start = 0, led_trig_stop = 0;
1460
1461 #ifdef CONFIG_PROVE_LOCKING
1462         WARN_ON(debug_locks && !lockdep_rtnl_is_held() &&
1463                 !lockdep_is_held(&local->iflist_mtx));
1464 #endif
1465         lockdep_assert_held(&local->mtx);
1466
1467         list_for_each_entry(sdata, &local->interfaces, list) {
1468                 if (!ieee80211_sdata_running(sdata)) {
1469                         sdata->vif.bss_conf.idle = true;
1470                         continue;
1471                 }
1472
1473                 sdata->old_idle = sdata->vif.bss_conf.idle;
1474
1475                 /* do not count disabled managed interfaces */
1476                 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1477                     !sdata->u.mgd.associated &&
1478                     !sdata->u.mgd.auth_data &&
1479                     !sdata->u.mgd.assoc_data) {
1480                         sdata->vif.bss_conf.idle = true;
1481                         continue;
1482                 }
1483                 /* do not count unused IBSS interfaces */
1484                 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
1485                     !sdata->u.ibss.ssid_len) {
1486                         sdata->vif.bss_conf.idle = true;
1487                         continue;
1488                 }
1489                 /* count everything else */
1490                 sdata->vif.bss_conf.idle = false;
1491                 count++;
1492         }
1493
1494         list_for_each_entry(wk, &local->work_list, list) {
1495                 working = true;
1496                 wk->sdata->vif.bss_conf.idle = false;
1497         }
1498
1499         if (local->scan_sdata &&
1500             !(local->hw.flags & IEEE80211_HW_SCAN_WHILE_IDLE)) {
1501                 scanning = true;
1502                 local->scan_sdata->vif.bss_conf.idle = false;
1503         }
1504
1505         if (local->hw_roc_channel)
1506                 hw_roc = true;
1507
1508         list_for_each_entry(sdata, &local->interfaces, list) {
1509                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1510                     sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1511                         continue;
1512                 if (sdata->old_idle == sdata->vif.bss_conf.idle)
1513                         continue;
1514                 if (!ieee80211_sdata_running(sdata))
1515                         continue;
1516                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_IDLE);
1517         }
1518
1519         if (working || scanning || hw_roc)
1520                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
1521         else
1522                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
1523
1524         if (count)
1525                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
1526         else
1527                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
1528
1529         ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
1530
1531         if (hw_roc)
1532                 return ieee80211_idle_off(local, "hw remain-on-channel");
1533         if (working)
1534                 return ieee80211_idle_off(local, "working");
1535         if (scanning)
1536                 return ieee80211_idle_off(local, "scanning");
1537         if (!count)
1538                 return ieee80211_idle_on(local);
1539         else
1540                 return ieee80211_idle_off(local, "in use");
1541
1542         return 0;
1543 }
1544
1545 void ieee80211_recalc_idle(struct ieee80211_local *local)
1546 {
1547         u32 chg;
1548
1549         mutex_lock(&local->iflist_mtx);
1550         chg = __ieee80211_recalc_idle(local);
1551         mutex_unlock(&local->iflist_mtx);
1552         if (chg)
1553                 ieee80211_hw_config(local, chg);
1554 }
1555
1556 static int netdev_notify(struct notifier_block *nb,
1557                          unsigned long state,
1558                          void *ndev)
1559 {
1560         struct net_device *dev = ndev;
1561         struct ieee80211_sub_if_data *sdata;
1562
1563         if (state != NETDEV_CHANGENAME)
1564                 return 0;
1565
1566         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1567                 return 0;
1568
1569         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1570                 return 0;
1571
1572         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1573
1574         memcpy(sdata->name, dev->name, IFNAMSIZ);
1575
1576         ieee80211_debugfs_rename_netdev(sdata);
1577         return 0;
1578 }
1579
1580 static struct notifier_block mac80211_netdev_notifier = {
1581         .notifier_call = netdev_notify,
1582 };
1583
1584 int ieee80211_iface_init(void)
1585 {
1586         return register_netdevice_notifier(&mac80211_netdev_notifier);
1587 }
1588
1589 void ieee80211_iface_exit(void)
1590 {
1591         unregister_netdevice_notifier(&mac80211_netdev_notifier);
1592 }