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                 flush_work(&sdata->work);
 641                 /*
 642                  * When we get here, the interface is marked down.
 643                  * Call synchronize_rcu() to wait for the RX path
 644                  * should it be using the interface and enqueuing
 645                  * frames at this very time on another CPU.
 646                  */
 647                 synchronize_rcu();
 648                 skb_queue_purge(&sdata->skb_queue);
 649
 650                 /*
 651                  * Disable beaconing here for mesh only, AP and IBSS
 652                  * are already taken care of.
 653                  */
 654                 if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
 655                         ieee80211_bss_info_change_notify(sdata,
 656                                 BSS_CHANGED_BEACON_ENABLED);
 657
 658                 /*
 659                  * Free all remaining keys, there shouldn't be any,
 660                  * except maybe group keys in AP more or WDS?
 661                  */
 662                 ieee80211_free_keys(sdata);
 663
 664                 if (going_down)
 665                         drv_remove_interface(local, sdata);
 666         }
 667
 668         sdata->bss = NULL;
 669
 670         mutex_lock(&local->mtx);
 671         hw_reconf_flags |= __ieee80211_recalc_idle(local);
 672         mutex_unlock(&local->mtx);
 673
 674         ieee80211_recalc_ps(local, -1);
 675
 676         if (local->open_count == 0) {
 677                 if (local->ops->napi_poll)
 678                         napi_disable(&local->napi);
 679                 ieee80211_clear_tx_pending(local);
 680                 ieee80211_stop_device(local);
 681
 682                 /* no reconfiguring after stop! */
 683                 hw_reconf_flags = 0;
 684         }
 685
 686         /* Re-calculate channel-type, in case there are multiple vifs
 687          * on different channel types.
 688          */
 689         orig_ct = local->_oper_channel_type;
 690         ieee80211_set_channel_type(local, NULL, NL80211_CHAN_NO_HT);
 691
 692         /* do after stop to avoid reconfiguring when we stop anyway */
 693         if (hw_reconf_flags || (orig_ct != local->_oper_channel_type))
 694                 ieee80211_hw_config(local, hw_reconf_flags);
 695
 696         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 697         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 698                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
 699                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 700                         if (info->control.vif == &sdata->vif) {
 701                                 __skb_unlink(skb, &local->pending[i]);
 702                                 dev_kfree_skb_irq(skb);
 703                         }
 704                 }
 705         }
 706         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 707
 708         if (local->monitors == local->open_count && local->monitors > 0)
 709                 ieee80211_add_virtual_monitor(local);
 710 }
 711
 712 static int ieee80211_stop(struct net_device *dev)
 713 {
 714         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 715
 716         ieee80211_do_stop(sdata, true);
 717
 718         return 0;
 719 }
 720
 721 static void ieee80211_set_multicast_list(struct net_device *dev)
 722 {
 723         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 724         struct ieee80211_local *local = sdata->local;
 725         int allmulti, promisc, sdata_allmulti, sdata_promisc;
 726
 727         allmulti = !!(dev->flags & IFF_ALLMULTI);
 728         promisc = !!(dev->flags & IFF_PROMISC);
 729         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
 730         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
 731
 732         if (allmulti != sdata_allmulti) {
 733                 if (dev->flags & IFF_ALLMULTI)
 734                         atomic_inc(&local->iff_allmultis);
 735                 else
 736                         atomic_dec(&local->iff_allmultis);
 737                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
 738         }
 739
 740         if (promisc != sdata_promisc) {
 741                 if (dev->flags & IFF_PROMISC)
 742                         atomic_inc(&local->iff_promiscs);
 743                 else
 744                         atomic_dec(&local->iff_promiscs);
 745                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
 746         }
 747         spin_lock_bh(&local->filter_lock);
 748         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
 749         spin_unlock_bh(&local->filter_lock);
 750         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
 751 }
 752
 753 /*
 754  * Called when the netdev is removed or, by the code below, before
 755  * the interface type changes.
 756  */
 757 static void ieee80211_teardown_sdata(struct net_device *dev)
 758 {
 759         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 760         struct ieee80211_local *local = sdata->local;
 761         int flushed;
 762         int i;
 763
 764         /* free extra data */
 765         ieee80211_free_keys(sdata);
 766
 767         ieee80211_debugfs_remove_netdev(sdata);
 768
 769         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
 770                 __skb_queue_purge(&sdata->fragments[i].skb_list);
 771         sdata->fragment_next = 0;
 772
 773         if (ieee80211_vif_is_mesh(&sdata->vif))
 774                 mesh_rmc_free(sdata);
 775
 776         flushed = sta_info_flush(local, sdata);
 777         WARN_ON(flushed);
 778 }
 779
 780 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
 781                                          struct sk_buff *skb)
 782 {
 783         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
 784 }
 785
 786 static const struct net_device_ops ieee80211_dataif_ops = {
 787         .ndo_open               = ieee80211_open,
 788         .ndo_stop               = ieee80211_stop,
 789         .ndo_uninit             = ieee80211_teardown_sdata,
 790         .ndo_start_xmit         = ieee80211_subif_start_xmit,
 791         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
 792         .ndo_change_mtu         = ieee80211_change_mtu,
 793         .ndo_set_mac_address    = ieee80211_change_mac,
 794         .ndo_select_queue       = ieee80211_netdev_select_queue,
 795 };
 796
 797 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
 798                                           struct sk_buff *skb)
 799 {
 800         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 801         struct ieee80211_local *local = sdata->local;
 802         struct ieee80211_hdr *hdr;
 803         struct ieee80211_radiotap_header *rtap = (void *)skb->data;
 804
 805         if (local->hw.queues < IEEE80211_NUM_ACS)
 806                 return 0;
 807
 808         if (skb->len < 4 ||
 809             skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
 810                 return 0; /* doesn't matter, frame will be dropped */
 811
 812         hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
 813
 814         return ieee80211_select_queue_80211(local, skb, hdr);
 815 }
 816
 817 static const struct net_device_ops ieee80211_monitorif_ops = {
 818         .ndo_open               = ieee80211_open,
 819         .ndo_stop               = ieee80211_stop,
 820         .ndo_uninit             = ieee80211_teardown_sdata,
 821         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
 822         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
 823         .ndo_change_mtu         = ieee80211_change_mtu,
 824         .ndo_set_mac_address    = eth_mac_addr,
 825         .ndo_select_queue       = ieee80211_monitor_select_queue,
 826 };
 827
 828 static void ieee80211_if_setup(struct net_device *dev)
 829 {
 830         ether_setup(dev);
 831         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
 832         dev->netdev_ops = &ieee80211_dataif_ops;
 833         dev->destructor = free_netdev;
 834 }
 835
 836 static void ieee80211_iface_work(struct work_struct *work)
 837 {
 838         struct ieee80211_sub_if_data *sdata =
 839                 container_of(work, struct ieee80211_sub_if_data, work);
 840         struct ieee80211_local *local = sdata->local;
 841         struct sk_buff *skb;
 842         struct sta_info *sta;
 843         struct ieee80211_ra_tid *ra_tid;
 844
 845         if (!ieee80211_sdata_running(sdata))
 846                 return;
 847
 848         if (local->scanning)
 849                 return;
 850
 851         /*
 852          * ieee80211_queue_work() should have picked up most cases,
 853          * here we'll pick the rest.
 854          */
 855         if (WARN(local->suspended,
 856                  "interface work scheduled while going to suspend\n"))
 857                 return;
 858
 859         /* first process frames */
 860         while ((skb = skb_dequeue(&sdata->skb_queue))) {
 861                 struct ieee80211_mgmt *mgmt = (void *)skb->data;
 862
 863                 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
 864                         ra_tid = (void *)&skb->cb;
 865                         ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
 866                                                  ra_tid->tid);
 867                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
 868                         ra_tid = (void *)&skb->cb;
 869                         ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
 870                                                 ra_tid->tid);
 871                 } else if (ieee80211_is_action(mgmt->frame_control) &&
 872                            mgmt->u.action.category == WLAN_CATEGORY_BACK) {
 873                         int len = skb->len;
 874
 875                         mutex_lock(&local->sta_mtx);
 876                         sta = sta_info_get_bss(sdata, mgmt->sa);
 877                         if (sta) {
 878                                 switch (mgmt->u.action.u.addba_req.action_code) {
 879                                 case WLAN_ACTION_ADDBA_REQ:
 880                                         ieee80211_process_addba_request(
 881                                                         local, sta, mgmt, len);
 882                                         break;
 883                                 case WLAN_ACTION_ADDBA_RESP:
 884                                         ieee80211_process_addba_resp(local, sta,
 885                                                                      mgmt, len);
 886                                         break;
 887                                 case WLAN_ACTION_DELBA:
 888                                         ieee80211_process_delba(sdata, sta,
 889                                                                 mgmt, len);
 890                                         break;
 891                                 default:
 892                                         WARN_ON(1);
 893                                         break;
 894                                 }
 895                         }
 896                         mutex_unlock(&local->sta_mtx);
 897                 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
 898                         struct ieee80211_hdr *hdr = (void *)mgmt;
 899                         /*
 900                          * So the frame isn't mgmt, but frame_control
 901                          * is at the right place anyway, of course, so
 902                          * the if statement is correct.
 903                          *
 904                          * Warn if we have other data frame types here,
 905                          * they must not get here.
 906                          */
 907                         WARN_ON(hdr->frame_control &
 908                                         cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
 909                         WARN_ON(!(hdr->seq_ctrl &
 910                                         cpu_to_le16(IEEE80211_SCTL_FRAG)));
 911                         /*
 912                          * This was a fragment of a frame, received while
 913                          * a block-ack session was active. That cannot be
 914                          * right, so terminate the session.
 915                          */
 916                         mutex_lock(&local->sta_mtx);
 917                         sta = sta_info_get_bss(sdata, mgmt->sa);
 918                         if (sta) {
 919                                 u16 tid = *ieee80211_get_qos_ctl(hdr) &
 920                                                 IEEE80211_QOS_CTL_TID_MASK;
 921
 922                                 __ieee80211_stop_rx_ba_session(
 923                                         sta, tid, WLAN_BACK_RECIPIENT,
 924                                         WLAN_REASON_QSTA_REQUIRE_SETUP,
 925                                         true);
 926                         }
 927                         mutex_unlock(&local->sta_mtx);
 928                 } else switch (sdata->vif.type) {
 929                 case NL80211_IFTYPE_STATION:
 930                         ieee80211_sta_rx_queued_mgmt(sdata, skb);
 931                         break;
 932                 case NL80211_IFTYPE_ADHOC:
 933                         ieee80211_ibss_rx_queued_mgmt(sdata, skb);
 934                         break;
 935                 case NL80211_IFTYPE_MESH_POINT:
 936                         if (!ieee80211_vif_is_mesh(&sdata->vif))
 937                                 break;
 938                         ieee80211_mesh_rx_queued_mgmt(sdata, skb);
 939                         break;
 940                 default:
 941                         WARN(1, "frame for unexpected interface type");
 942                         break;
 943                 }
 944
 945                 kfree_skb(skb);
 946         }
 947
 948         /* then other type-dependent work */
 949         switch (sdata->vif.type) {
 950         case NL80211_IFTYPE_STATION:
 951                 ieee80211_sta_work(sdata);
 952                 break;
 953         case NL80211_IFTYPE_ADHOC:
 954                 ieee80211_ibss_work(sdata);
 955                 break;
 956         case NL80211_IFTYPE_MESH_POINT:
 957                 if (!ieee80211_vif_is_mesh(&sdata->vif))
 958                         break;
 959                 ieee80211_mesh_work(sdata);
 960                 break;
 961         default:
 962                 break;
 963         }
 964 }
 965
 966
 967 /*
 968  * Helper function to initialise an interface to a specific type.
 969  */
 970 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
 971                                   enum nl80211_iftype type)
 972 {
 973         /* clear type-dependent union */
 974         memset(&sdata->u, 0, sizeof(sdata->u));
 975
 976         /* and set some type-dependent values */
 977         sdata->vif.type = type;
 978         sdata->vif.p2p = false;
 979         sdata->dev->netdev_ops = &ieee80211_dataif_ops;
 980         sdata->wdev.iftype = type;
 981
 982         sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
 983         sdata->control_port_no_encrypt = false;
 984
 985         sdata->noack_map = 0;
 986
 987         /* only monitor differs */
 988         sdata->dev->type = ARPHRD_ETHER;
 989
 990         skb_queue_head_init(&sdata->skb_queue);
 991         INIT_WORK(&sdata->work, ieee80211_iface_work);
 992
 993         switch (type) {
 994         case NL80211_IFTYPE_P2P_GO:
 995                 type = NL80211_IFTYPE_AP;
 996                 sdata->vif.type = type;
 997                 sdata->vif.p2p = true;
 998                 /* fall through */
 999         case NL80211_IFTYPE_AP:
1000                 skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
1001                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1002                 break;
1003         case NL80211_IFTYPE_P2P_CLIENT:
1004                 type = NL80211_IFTYPE_STATION;
1005                 sdata->vif.type = type;
1006                 sdata->vif.p2p = true;
1007                 /* fall through */
1008         case NL80211_IFTYPE_STATION:
1009                 ieee80211_sta_setup_sdata(sdata);
1010                 break;
1011         case NL80211_IFTYPE_ADHOC:
1012                 ieee80211_ibss_setup_sdata(sdata);
1013                 break;
1014         case NL80211_IFTYPE_MESH_POINT:
1015                 if (ieee80211_vif_is_mesh(&sdata->vif))
1016                         ieee80211_mesh_init_sdata(sdata);
1017                 break;
1018         case NL80211_IFTYPE_MONITOR:
1019                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1020                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1021                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
1022                                       MONITOR_FLAG_OTHER_BSS;
1023                 break;
1024         case NL80211_IFTYPE_WDS:
1025         case NL80211_IFTYPE_AP_VLAN:
1026                 break;
1027         case NL80211_IFTYPE_UNSPECIFIED:
1028         case NUM_NL80211_IFTYPES:
1029                 BUG();
1030                 break;
1031         }
1032
1033         ieee80211_debugfs_add_netdev(sdata);
1034 }
1035
1036 static void ieee80211_clean_sdata(struct ieee80211_sub_if_data *sdata)
1037 {
1038         switch (sdata->vif.type) {
1039         case NL80211_IFTYPE_MESH_POINT:
1040                 mesh_path_flush_by_iface(sdata);
1041                 break;
1042
1043         default:
1044                 break;
1045         }
1046 }
1047
1048 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1049                                            enum nl80211_iftype type)
1050 {
1051         struct ieee80211_local *local = sdata->local;
1052         int ret, err;
1053         enum nl80211_iftype internal_type = type;
1054         bool p2p = false;
1055
1056         ASSERT_RTNL();
1057
1058         if (!local->ops->change_interface)
1059                 return -EBUSY;
1060
1061         switch (sdata->vif.type) {
1062         case NL80211_IFTYPE_AP:
1063         case NL80211_IFTYPE_STATION:
1064         case NL80211_IFTYPE_ADHOC:
1065                 /*
1066                  * Could maybe also all others here?
1067                  * Just not sure how that interacts
1068                  * with the RX/config path e.g. for
1069                  * mesh.
1070                  */
1071                 break;
1072         default:
1073                 return -EBUSY;
1074         }
1075
1076         switch (type) {
1077         case NL80211_IFTYPE_AP:
1078         case NL80211_IFTYPE_STATION:
1079         case NL80211_IFTYPE_ADHOC:
1080                 /*
1081                  * Could probably support everything
1082                  * but WDS here (WDS do_open can fail
1083                  * under memory pressure, which this
1084                  * code isn't prepared to handle).
1085                  */
1086                 break;
1087         case NL80211_IFTYPE_P2P_CLIENT:
1088                 p2p = true;
1089                 internal_type = NL80211_IFTYPE_STATION;
1090                 break;
1091         case NL80211_IFTYPE_P2P_GO:
1092                 p2p = true;
1093                 internal_type = NL80211_IFTYPE_AP;
1094                 break;
1095         default:
1096                 return -EBUSY;
1097         }
1098
1099         ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1100         if (ret)
1101                 return ret;
1102
1103         ieee80211_do_stop(sdata, false);
1104
1105         ieee80211_teardown_sdata(sdata->dev);
1106
1107         ret = drv_change_interface(local, sdata, internal_type, p2p);
1108         if (ret)
1109                 type = sdata->vif.type;
1110
1111         /*
1112          * Ignore return value here, there's not much we can do since
1113          * the driver changed the interface type internally already.
1114          * The warnings will hopefully make driver authors fix it :-)
1115          */
1116         ieee80211_check_queues(sdata);
1117
1118         ieee80211_setup_sdata(sdata, type);
1119
1120         err = ieee80211_do_open(sdata->dev, false);
1121         WARN(err, "type change: do_open returned %d", err);
1122
1123         return ret;
1124 }
1125
1126 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1127                              enum nl80211_iftype type)
1128 {
1129         int ret;
1130
1131         ASSERT_RTNL();
1132
1133         if (type == ieee80211_vif_type_p2p(&sdata->vif))
1134                 return 0;
1135
1136         /* Setting ad-hoc mode on non-IBSS channel is not supported. */
1137         if (sdata->local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS &&
1138             type == NL80211_IFTYPE_ADHOC)
1139                 return -EOPNOTSUPP;
1140
1141         if (ieee80211_sdata_running(sdata)) {
1142                 ret = ieee80211_runtime_change_iftype(sdata, type);
1143                 if (ret)
1144                         return ret;
1145         } else {
1146                 /* Purge and reset type-dependent state. */
1147                 ieee80211_teardown_sdata(sdata->dev);
1148                 ieee80211_setup_sdata(sdata, type);
1149         }
1150
1151         /* reset some values that shouldn't be kept across type changes */
1152         sdata->vif.bss_conf.basic_rates =
1153                 ieee80211_mandatory_rates(sdata->local,
1154                         sdata->local->hw.conf.channel->band);
1155         sdata->drop_unencrypted = 0;
1156         if (type == NL80211_IFTYPE_STATION)
1157                 sdata->u.mgd.use_4addr = false;
1158
1159         return 0;
1160 }
1161
1162 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1163                                        struct net_device *dev,
1164                                        enum nl80211_iftype type)
1165 {
1166         struct ieee80211_sub_if_data *sdata;
1167         u64 mask, start, addr, val, inc;
1168         u8 *m;
1169         u8 tmp_addr[ETH_ALEN];
1170         int i;
1171
1172         /* default ... something at least */
1173         memcpy(dev->perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1174
1175         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1176             local->hw.wiphy->n_addresses <= 1)
1177                 return;
1178
1179
1180         mutex_lock(&local->iflist_mtx);
1181
1182         switch (type) {
1183         case NL80211_IFTYPE_MONITOR:
1184                 /* doesn't matter */
1185                 break;
1186         case NL80211_IFTYPE_WDS:
1187         case NL80211_IFTYPE_AP_VLAN:
1188                 /* match up with an AP interface */
1189                 list_for_each_entry(sdata, &local->interfaces, list) {
1190                         if (sdata->vif.type != NL80211_IFTYPE_AP)
1191                                 continue;
1192                         memcpy(dev->perm_addr, sdata->vif.addr, ETH_ALEN);
1193                         break;
1194                 }
1195                 /* keep default if no AP interface present */
1196                 break;
1197         default:
1198                 /* assign a new address if possible -- try n_addresses first */
1199                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1200                         bool used = false;
1201
1202                         list_for_each_entry(sdata, &local->interfaces, list) {
1203                                 if (memcmp(local->hw.wiphy->addresses[i].addr,
1204                                            sdata->vif.addr, ETH_ALEN) == 0) {
1205                                         used = true;
1206                                         break;
1207                                 }
1208                         }
1209
1210                         if (!used) {
1211                                 memcpy(dev->perm_addr,
1212                                        local->hw.wiphy->addresses[i].addr,
1213                                        ETH_ALEN);
1214                                 break;
1215                         }
1216                 }
1217
1218                 /* try mask if available */
1219                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1220                         break;
1221
1222                 m = local->hw.wiphy->addr_mask;
1223                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1224                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1225                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1226
1227                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1228                         /* not a contiguous mask ... not handled now! */
1229                         printk(KERN_DEBUG "not contiguous\n");
1230                         break;
1231                 }
1232
1233                 m = local->hw.wiphy->perm_addr;
1234                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1235                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1236                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1237
1238                 inc = 1ULL<<__ffs64(mask);
1239                 val = (start & mask);
1240                 addr = (start & ~mask) | (val & mask);
1241                 do {
1242                         bool used = false;
1243
1244                         tmp_addr[5] = addr >> 0*8;
1245                         tmp_addr[4] = addr >> 1*8;
1246                         tmp_addr[3] = addr >> 2*8;
1247                         tmp_addr[2] = addr >> 3*8;
1248                         tmp_addr[1] = addr >> 4*8;
1249                         tmp_addr[0] = addr >> 5*8;
1250
1251                         val += inc;
1252
1253                         list_for_each_entry(sdata, &local->interfaces, list) {
1254                                 if (memcmp(tmp_addr, sdata->vif.addr,
1255                                                         ETH_ALEN) == 0) {
1256                                         used = true;
1257                                         break;
1258                                 }
1259                         }
1260
1261                         if (!used) {
1262                                 memcpy(dev->perm_addr, tmp_addr, ETH_ALEN);
1263                                 break;
1264                         }
1265                         addr = (start & ~mask) | (val & mask);
1266                 } while (addr != start);
1267
1268                 break;
1269         }
1270
1271         mutex_unlock(&local->iflist_mtx);
1272 }
1273
1274 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1275                      struct net_device **new_dev, enum nl80211_iftype type,
1276                      struct vif_params *params)
1277 {
1278         struct net_device *ndev;
1279         struct ieee80211_sub_if_data *sdata = NULL;
1280         int ret, i;
1281         int txqs = 1;
1282
1283         ASSERT_RTNL();
1284
1285         if (local->hw.queues >= IEEE80211_NUM_ACS)
1286                 txqs = IEEE80211_NUM_ACS;
1287
1288         ndev = alloc_netdev_mqs(sizeof(*sdata) + local->hw.vif_data_size,
1289                                 name, ieee80211_if_setup, txqs, 1);
1290         if (!ndev)
1291                 return -ENOMEM;
1292         dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1293
1294         ndev->needed_headroom = local->tx_headroom +
1295                                 4*6 /* four MAC addresses */
1296                                 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1297                                 + 6 /* mesh */
1298                                 + 8 /* rfc1042/bridge tunnel */
1299                                 - ETH_HLEN /* ethernet hard_header_len */
1300                                 + IEEE80211_ENCRYPT_HEADROOM;
1301         ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1302
1303         ret = dev_alloc_name(ndev, ndev->name);
1304         if (ret < 0)
1305                 goto fail;
1306
1307         ieee80211_assign_perm_addr(local, ndev, type);
1308         memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1309         SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1310
1311         /* don't use IEEE80211_DEV_TO_SUB_IF because it checks too much */
1312         sdata = netdev_priv(ndev);
1313         ndev->ieee80211_ptr = &sdata->wdev;
1314         memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1315         memcpy(sdata->name, ndev->name, IFNAMSIZ);
1316
1317         /* initialise type-independent data */
1318         sdata->wdev.wiphy = local->hw.wiphy;
1319         sdata->local = local;
1320         sdata->dev = ndev;
1321 #ifdef CONFIG_INET
1322         sdata->arp_filter_state = true;
1323 #endif
1324
1325         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1326                 skb_queue_head_init(&sdata->fragments[i].skb_list);
1327
1328         INIT_LIST_HEAD(&sdata->key_list);
1329
1330         for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1331                 struct ieee80211_supported_band *sband;
1332                 sband = local->hw.wiphy->bands[i];
1333                 sdata->rc_rateidx_mask[i] =
1334                         sband ? (1 << sband->n_bitrates) - 1 : 0;
1335                 if (sband)
1336                         memcpy(sdata->rc_rateidx_mcs_mask[i],
1337                                sband->ht_cap.mcs.rx_mask,
1338                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1339                 else
1340                         memset(sdata->rc_rateidx_mcs_mask[i], 0,
1341                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1342         }
1343
1344         ieee80211_set_default_queues(sdata);
1345
1346         /* setup type-dependent data */
1347         ieee80211_setup_sdata(sdata, type);
1348
1349         if (params) {
1350                 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1351                 if (type == NL80211_IFTYPE_STATION)
1352                         sdata->u.mgd.use_4addr = params->use_4addr;
1353         }
1354
1355         ret = register_netdevice(ndev);
1356         if (ret)
1357                 goto fail;
1358
1359         mutex_lock(&local->iflist_mtx);
1360         list_add_tail_rcu(&sdata->list, &local->interfaces);
1361         mutex_unlock(&local->iflist_mtx);
1362
1363         if (new_dev)
1364                 *new_dev = ndev;
1365
1366         return 0;
1367
1368  fail:
1369         free_netdev(ndev);
1370         return ret;
1371 }
1372
1373 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1374 {
1375         ASSERT_RTNL();
1376
1377         mutex_lock(&sdata->local->iflist_mtx);
1378         list_del_rcu(&sdata->list);
1379         mutex_unlock(&sdata->local->iflist_mtx);
1380
1381         /* clean up type-dependent data */
1382         ieee80211_clean_sdata(sdata);
1383
1384         synchronize_rcu();
1385         unregister_netdevice(sdata->dev);
1386 }
1387
1388 /*
1389  * Remove all interfaces, may only be called at hardware unregistration
1390  * time because it doesn't do RCU-safe list removals.
1391  */
1392 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1393 {
1394         struct ieee80211_sub_if_data *sdata, *tmp;
1395         LIST_HEAD(unreg_list);
1396
1397         ASSERT_RTNL();
1398
1399         mutex_lock(&local->iflist_mtx);
1400         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1401                 list_del(&sdata->list);
1402
1403                 ieee80211_clean_sdata(sdata);
1404
1405                 unregister_netdevice_queue(sdata->dev, &unreg_list);
1406         }
1407         mutex_unlock(&local->iflist_mtx);
1408         unregister_netdevice_many(&unreg_list);
1409         list_del(&unreg_list);
1410 }
1411
1412 static u32 ieee80211_idle_off(struct ieee80211_local *local,
1413                               const char *reason)
1414 {
1415         if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
1416                 return 0;
1417
1418 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1419         wiphy_debug(local->hw.wiphy, "device no longer idle - %s\n", reason);
1420 #endif
1421
1422         local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
1423         return IEEE80211_CONF_CHANGE_IDLE;
1424 }
1425
1426 static u32 ieee80211_idle_on(struct ieee80211_local *local)
1427 {
1428         if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
1429                 return 0;
1430
1431 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1432         wiphy_debug(local->hw.wiphy, "device now idle\n");
1433 #endif
1434
1435         drv_flush(local, false);
1436
1437         local->hw.conf.flags |= IEEE80211_CONF_IDLE;
1438         return IEEE80211_CONF_CHANGE_IDLE;
1439 }
1440
1441 u32 __ieee80211_recalc_idle(struct ieee80211_local *local)
1442 {
1443         struct ieee80211_sub_if_data *sdata;
1444         int count = 0;
1445         bool working = false, scanning = false, hw_roc = false;
1446         struct ieee80211_work *wk;
1447         unsigned int led_trig_start = 0, led_trig_stop = 0;
1448
1449 #ifdef CONFIG_PROVE_LOCKING
1450         WARN_ON(debug_locks && !lockdep_rtnl_is_held() &&
1451                 !lockdep_is_held(&local->iflist_mtx));
1452 #endif
1453         lockdep_assert_held(&local->mtx);
1454
1455         list_for_each_entry(sdata, &local->interfaces, list) {
1456                 if (!ieee80211_sdata_running(sdata)) {
1457                         sdata->vif.bss_conf.idle = true;
1458                         continue;
1459                 }
1460
1461                 sdata->old_idle = sdata->vif.bss_conf.idle;
1462
1463                 /* do not count disabled managed interfaces */
1464                 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1465                     !sdata->u.mgd.associated &&
1466                     !sdata->u.mgd.auth_data &&
1467                     !sdata->u.mgd.assoc_data) {
1468                         sdata->vif.bss_conf.idle = true;
1469                         continue;
1470                 }
1471                 /* do not count unused IBSS interfaces */
1472                 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
1473                     !sdata->u.ibss.ssid_len) {
1474                         sdata->vif.bss_conf.idle = true;
1475                         continue;
1476                 }
1477                 /* count everything else */
1478                 sdata->vif.bss_conf.idle = false;
1479                 count++;
1480         }
1481
1482         list_for_each_entry(wk, &local->work_list, list) {
1483                 working = true;
1484                 wk->sdata->vif.bss_conf.idle = false;
1485         }
1486
1487         if (local->scan_sdata &&
1488             !(local->hw.flags & IEEE80211_HW_SCAN_WHILE_IDLE)) {
1489                 scanning = true;
1490                 local->scan_sdata->vif.bss_conf.idle = false;
1491         }
1492
1493         if (local->hw_roc_channel)
1494                 hw_roc = true;
1495
1496         list_for_each_entry(sdata, &local->interfaces, list) {
1497                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1498                     sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1499                         continue;
1500                 if (sdata->old_idle == sdata->vif.bss_conf.idle)
1501                         continue;
1502                 if (!ieee80211_sdata_running(sdata))
1503                         continue;
1504                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_IDLE);
1505         }
1506
1507         if (working || scanning || hw_roc)
1508                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
1509         else
1510                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
1511
1512         if (count)
1513                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
1514         else
1515                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
1516
1517         ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
1518
1519         if (hw_roc)
1520                 return ieee80211_idle_off(local, "hw remain-on-channel");
1521         if (working)
1522                 return ieee80211_idle_off(local, "working");
1523         if (scanning)
1524                 return ieee80211_idle_off(local, "scanning");
1525         if (!count)
1526                 return ieee80211_idle_on(local);
1527         else
1528                 return ieee80211_idle_off(local, "in use");
1529
1530         return 0;
1531 }
1532
1533 void ieee80211_recalc_idle(struct ieee80211_local *local)
1534 {
1535         u32 chg;
1536
1537         mutex_lock(&local->iflist_mtx);
1538         chg = __ieee80211_recalc_idle(local);
1539         mutex_unlock(&local->iflist_mtx);
1540         if (chg)
1541                 ieee80211_hw_config(local, chg);
1542 }
1543
1544 static int netdev_notify(struct notifier_block *nb,
1545                          unsigned long state,
1546                          void *ndev)
1547 {
1548         struct net_device *dev = ndev;
1549         struct ieee80211_sub_if_data *sdata;
1550
1551         if (state != NETDEV_CHANGENAME)
1552                 return 0;
1553
1554         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1555                 return 0;
1556
1557         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1558                 return 0;
1559
1560         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1561
1562         memcpy(sdata->name, dev->name, IFNAMSIZ);
1563
1564         ieee80211_debugfs_rename_netdev(sdata);
1565         return 0;
1566 }
1567
1568 static struct notifier_block mac80211_netdev_notifier = {
1569         .notifier_call = netdev_notify,
1570 };
1571
1572 int ieee80211_iface_init(void)
1573 {
1574         return register_netdevice_notifier(&mac80211_netdev_notifier);
1575 }
1576
1577 void ieee80211_iface_exit(void)
1578 {
1579         unregister_netdevice_notifier(&mac80211_netdev_notifier);
1580 }