linux/net/mac80211/iface.c
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   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
  46static u32 ieee80211_idle_off(struct ieee80211_local *local,
  47                              const char *reason)
  48{
  49        if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
  50                return 0;
  51
  52        local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
  53        return IEEE80211_CONF_CHANGE_IDLE;
  54}
  55
  56static u32 ieee80211_idle_on(struct ieee80211_local *local)
  57{
  58        if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
  59                return 0;
  60
  61        drv_flush(local, false);
  62
  63        local->hw.conf.flags |= IEEE80211_CONF_IDLE;
  64        return IEEE80211_CONF_CHANGE_IDLE;
  65}
  66
  67static u32 __ieee80211_recalc_idle(struct ieee80211_local *local)
  68{
  69        struct ieee80211_sub_if_data *sdata;
  70        int count = 0;
  71        bool working = false, scanning = false;
  72        unsigned int led_trig_start = 0, led_trig_stop = 0;
  73        struct ieee80211_roc_work *roc;
  74
  75#ifdef CONFIG_PROVE_LOCKING
  76        WARN_ON(debug_locks && !lockdep_rtnl_is_held() &&
  77                !lockdep_is_held(&local->iflist_mtx));
  78#endif
  79        lockdep_assert_held(&local->mtx);
  80
  81        list_for_each_entry(sdata, &local->interfaces, list) {
  82                if (!ieee80211_sdata_running(sdata)) {
  83                        sdata->vif.bss_conf.idle = true;
  84                        continue;
  85                }
  86
  87                sdata->old_idle = sdata->vif.bss_conf.idle;
  88
  89                /* do not count disabled managed interfaces */
  90                if (sdata->vif.type == NL80211_IFTYPE_STATION &&
  91                    !sdata->u.mgd.associated &&
  92                    !sdata->u.mgd.auth_data &&
  93                    !sdata->u.mgd.assoc_data) {
  94                        sdata->vif.bss_conf.idle = true;
  95                        continue;
  96                }
  97                /* do not count unused IBSS interfaces */
  98                if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
  99                    !sdata->u.ibss.ssid_len) {
 100                        sdata->vif.bss_conf.idle = true;
 101                        continue;
 102                }
 103
 104                if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE)
 105                        continue;
 106
 107                /* count everything else */
 108                sdata->vif.bss_conf.idle = false;
 109                count++;
 110        }
 111
 112        if (!local->ops->remain_on_channel) {
 113                list_for_each_entry(roc, &local->roc_list, list) {
 114                        working = true;
 115                        roc->sdata->vif.bss_conf.idle = false;
 116                }
 117        }
 118
 119        sdata = rcu_dereference_protected(local->scan_sdata,
 120                                          lockdep_is_held(&local->mtx));
 121        if (sdata && !(local->hw.flags & IEEE80211_HW_SCAN_WHILE_IDLE)) {
 122                scanning = true;
 123                sdata->vif.bss_conf.idle = false;
 124        }
 125
 126        list_for_each_entry(sdata, &local->interfaces, list) {
 127                if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
 128                    sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
 129                    sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE)
 130                        continue;
 131                if (sdata->old_idle == sdata->vif.bss_conf.idle)
 132                        continue;
 133                if (!ieee80211_sdata_running(sdata))
 134                        continue;
 135                ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_IDLE);
 136        }
 137
 138        if (working || scanning)
 139                led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
 140        else
 141                led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
 142
 143        if (count)
 144                led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
 145        else
 146                led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
 147
 148        ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
 149
 150        if (working)
 151                return ieee80211_idle_off(local, "working");
 152        if (scanning)
 153                return ieee80211_idle_off(local, "scanning");
 154        if (!count)
 155                return ieee80211_idle_on(local);
 156        else
 157                return ieee80211_idle_off(local, "in use");
 158
 159        return 0;
 160}
 161
 162void ieee80211_recalc_idle(struct ieee80211_local *local)
 163{
 164        u32 chg;
 165
 166        mutex_lock(&local->iflist_mtx);
 167        chg = __ieee80211_recalc_idle(local);
 168        mutex_unlock(&local->iflist_mtx);
 169        if (chg)
 170                ieee80211_hw_config(local, chg);
 171}
 172
 173static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
 174{
 175        int meshhdrlen;
 176        struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 177
 178        meshhdrlen = (sdata->vif.type == NL80211_IFTYPE_MESH_POINT) ? 5 : 0;
 179
 180        /* FIX: what would be proper limits for MTU?
 181         * This interface uses 802.3 frames. */
 182        if (new_mtu < 256 ||
 183            new_mtu > IEEE80211_MAX_DATA_LEN - 24 - 6 - meshhdrlen) {
 184                return -EINVAL;
 185        }
 186
 187        dev->mtu = new_mtu;
 188        return 0;
 189}
 190
 191static int ieee80211_change_mac(struct net_device *dev, void *addr)
 192{
 193        struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 194        struct sockaddr *sa = addr;
 195        int ret;
 196
 197        if (ieee80211_sdata_running(sdata))
 198                return -EBUSY;
 199
 200        ret = eth_mac_addr(dev, sa);
 201
 202        if (ret == 0)
 203                memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
 204
 205        return ret;
 206}
 207
 208static inline int identical_mac_addr_allowed(int type1, int type2)
 209{
 210        return type1 == NL80211_IFTYPE_MONITOR ||
 211                type2 == NL80211_IFTYPE_MONITOR ||
 212                type1 == NL80211_IFTYPE_P2P_DEVICE ||
 213                type2 == NL80211_IFTYPE_P2P_DEVICE ||
 214                (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
 215                (type1 == NL80211_IFTYPE_WDS &&
 216                        (type2 == NL80211_IFTYPE_WDS ||
 217                         type2 == NL80211_IFTYPE_AP)) ||
 218                (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
 219                (type1 == NL80211_IFTYPE_AP_VLAN &&
 220                        (type2 == NL80211_IFTYPE_AP ||
 221                         type2 == NL80211_IFTYPE_AP_VLAN));
 222}
 223
 224static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
 225                                            enum nl80211_iftype iftype)
 226{
 227        struct ieee80211_local *local = sdata->local;
 228        struct ieee80211_sub_if_data *nsdata;
 229
 230        ASSERT_RTNL();
 231
 232        /* we hold the RTNL here so can safely walk the list */
 233        list_for_each_entry(nsdata, &local->interfaces, list) {
 234                if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
 235                        /*
 236                         * Allow only a single IBSS interface to be up at any
 237                         * time. This is restricted because beacon distribution
 238                         * cannot work properly if both are in the same IBSS.
 239                         *
 240                         * To remove this restriction we'd have to disallow them
 241                         * from setting the same SSID on different IBSS interfaces
 242                         * belonging to the same hardware. Then, however, we're
 243                         * faced with having to adopt two different TSF timers...
 244                         */
 245                        if (iftype == NL80211_IFTYPE_ADHOC &&
 246                            nsdata->vif.type == NL80211_IFTYPE_ADHOC)
 247                                return -EBUSY;
 248
 249                        /*
 250                         * The remaining checks are only performed for interfaces
 251                         * with the same MAC address.
 252                         */
 253                        if (!ether_addr_equal(sdata->vif.addr,
 254                                              nsdata->vif.addr))
 255                                continue;
 256
 257                        /*
 258                         * check whether it may have the same address
 259                         */
 260                        if (!identical_mac_addr_allowed(iftype,
 261                                                        nsdata->vif.type))
 262                                return -ENOTUNIQ;
 263
 264                        /*
 265                         * can only add VLANs to enabled APs
 266                         */
 267                        if (iftype == NL80211_IFTYPE_AP_VLAN &&
 268                            nsdata->vif.type == NL80211_IFTYPE_AP)
 269                                sdata->bss = &nsdata->u.ap;
 270                }
 271        }
 272
 273        return 0;
 274}
 275
 276static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata)
 277{
 278        int n_queues = sdata->local->hw.queues;
 279        int i;
 280
 281        if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) {
 282                for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 283                        if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
 284                                         IEEE80211_INVAL_HW_QUEUE))
 285                                return -EINVAL;
 286                        if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
 287                                         n_queues))
 288                                return -EINVAL;
 289                }
 290        }
 291
 292        if ((sdata->vif.type != NL80211_IFTYPE_AP) ||
 293            !(sdata->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)) {
 294                sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
 295                return 0;
 296        }
 297
 298        if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
 299                return -EINVAL;
 300
 301        if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
 302                return -EINVAL;
 303
 304        return 0;
 305}
 306
 307void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
 308                                    const int offset)
 309{
 310        struct ieee80211_local *local = sdata->local;
 311        u32 flags = sdata->u.mntr_flags;
 312
 313#define ADJUST(_f, _s)  do {                                    \
 314        if (flags & MONITOR_FLAG_##_f)                          \
 315                local->fif_##_s += offset;                      \
 316        } while (0)
 317
 318        ADJUST(FCSFAIL, fcsfail);
 319        ADJUST(PLCPFAIL, plcpfail);
 320        ADJUST(CONTROL, control);
 321        ADJUST(CONTROL, pspoll);
 322        ADJUST(OTHER_BSS, other_bss);
 323
 324#undef ADJUST
 325}
 326
 327static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
 328{
 329        struct ieee80211_local *local = sdata->local;
 330        int i;
 331
 332        for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 333                if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
 334                        sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
 335                else if (local->hw.queues >= IEEE80211_NUM_ACS)
 336                        sdata->vif.hw_queue[i] = i;
 337                else
 338                        sdata->vif.hw_queue[i] = 0;
 339        }
 340        sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
 341}
 342
 343static int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
 344{
 345        struct ieee80211_sub_if_data *sdata;
 346        int ret = 0;
 347
 348        if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
 349                return 0;
 350
 351        mutex_lock(&local->iflist_mtx);
 352
 353        if (local->monitor_sdata)
 354                goto out_unlock;
 355
 356        sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
 357        if (!sdata) {
 358                ret = -ENOMEM;
 359                goto out_unlock;
 360        }
 361
 362        /* set up data */
 363        sdata->local = local;
 364        sdata->vif.type = NL80211_IFTYPE_MONITOR;
 365        snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
 366                 wiphy_name(local->hw.wiphy));
 367
 368        ieee80211_set_default_queues(sdata);
 369
 370        ret = drv_add_interface(local, sdata);
 371        if (WARN_ON(ret)) {
 372                /* ok .. stupid driver, it asked for this! */
 373                kfree(sdata);
 374                goto out_unlock;
 375        }
 376
 377        ret = ieee80211_check_queues(sdata);
 378        if (ret) {
 379                kfree(sdata);
 380                goto out_unlock;
 381        }
 382
 383        rcu_assign_pointer(local->monitor_sdata, sdata);
 384 out_unlock:
 385        mutex_unlock(&local->iflist_mtx);
 386        return ret;
 387}
 388
 389static void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
 390{
 391        struct ieee80211_sub_if_data *sdata;
 392
 393        if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
 394                return;
 395
 396        mutex_lock(&local->iflist_mtx);
 397
 398        sdata = rcu_dereference_protected(local->monitor_sdata,
 399                                          lockdep_is_held(&local->iflist_mtx));
 400        if (!sdata)
 401                goto out_unlock;
 402
 403        rcu_assign_pointer(local->monitor_sdata, NULL);
 404        synchronize_net();
 405
 406        drv_remove_interface(local, sdata);
 407
 408        kfree(sdata);
 409 out_unlock:
 410        mutex_unlock(&local->iflist_mtx);
 411}
 412
 413/*
 414 * NOTE: Be very careful when changing this function, it must NOT return
 415 * an error on interface type changes that have been pre-checked, so most
 416 * checks should be in ieee80211_check_concurrent_iface.
 417 */
 418int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
 419{
 420        struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
 421        struct net_device *dev = wdev->netdev;
 422        struct ieee80211_local *local = sdata->local;
 423        struct sta_info *sta;
 424        u32 changed = 0;
 425        int res;
 426        u32 hw_reconf_flags = 0;
 427
 428        switch (sdata->vif.type) {
 429        case NL80211_IFTYPE_WDS:
 430                if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
 431                        return -ENOLINK;
 432                break;
 433        case NL80211_IFTYPE_AP_VLAN: {
 434                struct ieee80211_sub_if_data *master;
 435
 436                if (!sdata->bss)
 437                        return -ENOLINK;
 438
 439                list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
 440
 441                master = container_of(sdata->bss,
 442                                      struct ieee80211_sub_if_data, u.ap);
 443                sdata->control_port_protocol =
 444                        master->control_port_protocol;
 445                sdata->control_port_no_encrypt =
 446                        master->control_port_no_encrypt;
 447                break;
 448                }
 449        case NL80211_IFTYPE_AP:
 450                sdata->bss = &sdata->u.ap;
 451                break;
 452        case NL80211_IFTYPE_MESH_POINT:
 453        case NL80211_IFTYPE_STATION:
 454        case NL80211_IFTYPE_MONITOR:
 455        case NL80211_IFTYPE_ADHOC:
 456        case NL80211_IFTYPE_P2P_DEVICE:
 457                /* no special treatment */
 458                break;
 459        case NL80211_IFTYPE_UNSPECIFIED:
 460        case NUM_NL80211_IFTYPES:
 461        case NL80211_IFTYPE_P2P_CLIENT:
 462        case NL80211_IFTYPE_P2P_GO:
 463                /* cannot happen */
 464                WARN_ON(1);
 465                break;
 466        }
 467
 468        if (local->open_count == 0) {
 469                res = drv_start(local);
 470                if (res)
 471                        goto err_del_bss;
 472                if (local->ops->napi_poll)
 473                        napi_enable(&local->napi);
 474                /* we're brought up, everything changes */
 475                hw_reconf_flags = ~0;
 476                ieee80211_led_radio(local, true);
 477                ieee80211_mod_tpt_led_trig(local,
 478                                           IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
 479        }
 480
 481        /*
 482         * Copy the hopefully now-present MAC address to
 483         * this interface, if it has the special null one.
 484         */
 485        if (dev && is_zero_ether_addr(dev->dev_addr)) {
 486                memcpy(dev->dev_addr,
 487                       local->hw.wiphy->perm_addr,
 488                       ETH_ALEN);
 489                memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
 490
 491                if (!is_valid_ether_addr(dev->dev_addr)) {
 492                        res = -EADDRNOTAVAIL;
 493                        goto err_stop;
 494                }
 495        }
 496
 497        switch (sdata->vif.type) {
 498        case NL80211_IFTYPE_AP_VLAN:
 499                /* no need to tell driver, but set carrier */
 500                if (rtnl_dereference(sdata->bss->beacon))
 501                        netif_carrier_on(dev);
 502                else
 503                        netif_carrier_off(dev);
 504                break;
 505        case NL80211_IFTYPE_MONITOR:
 506                if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 507                        local->cooked_mntrs++;
 508                        break;
 509                }
 510
 511                if (local->monitors == 0 && local->open_count == 0) {
 512                        res = ieee80211_add_virtual_monitor(local);
 513                        if (res)
 514                                goto err_stop;
 515                }
 516
 517                /* must be before the call to ieee80211_configure_filter */
 518                local->monitors++;
 519                if (local->monitors == 1) {
 520                        local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
 521                        hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 522                }
 523
 524                ieee80211_adjust_monitor_flags(sdata, 1);
 525                ieee80211_configure_filter(local);
 526
 527                netif_carrier_on(dev);
 528                break;
 529        default:
 530                if (coming_up) {
 531                        ieee80211_del_virtual_monitor(local);
 532
 533                        res = drv_add_interface(local, sdata);
 534                        if (res)
 535                                goto err_stop;
 536                        res = ieee80211_check_queues(sdata);
 537                        if (res)
 538                                goto err_del_interface;
 539                }
 540
 541                if (sdata->vif.type == NL80211_IFTYPE_AP) {
 542                        local->fif_pspoll++;
 543                        local->fif_probe_req++;
 544
 545                        ieee80211_configure_filter(local);
 546                } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 547                        local->fif_probe_req++;
 548                }
 549
 550                if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
 551                        changed |= ieee80211_reset_erp_info(sdata);
 552                ieee80211_bss_info_change_notify(sdata, changed);
 553
 554                switch (sdata->vif.type) {
 555                case NL80211_IFTYPE_STATION:
 556                case NL80211_IFTYPE_ADHOC:
 557                case NL80211_IFTYPE_AP:
 558                case NL80211_IFTYPE_MESH_POINT:
 559                        netif_carrier_off(dev);
 560                        break;
 561                case NL80211_IFTYPE_WDS:
 562                case NL80211_IFTYPE_P2P_DEVICE:
 563                        break;
 564                default:
 565                        netif_carrier_on(dev);
 566                }
 567
 568                /*
 569                 * set default queue parameters so drivers don't
 570                 * need to initialise the hardware if the hardware
 571                 * doesn't start up with sane defaults
 572                 */
 573                ieee80211_set_wmm_default(sdata, true);
 574        }
 575
 576        set_bit(SDATA_STATE_RUNNING, &sdata->state);
 577
 578        if (sdata->vif.type == NL80211_IFTYPE_WDS) {
 579                /* Create STA entry for the WDS peer */
 580                sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
 581                                     GFP_KERNEL);
 582                if (!sta) {
 583                        res = -ENOMEM;
 584                        goto err_del_interface;
 585                }
 586
 587                sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
 588                sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
 589                sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
 590
 591                res = sta_info_insert(sta);
 592                if (res) {
 593                        /* STA has been freed */
 594                        goto err_del_interface;
 595                }
 596
 597                rate_control_rate_init(sta);
 598                netif_carrier_on(dev);
 599        } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
 600                rcu_assign_pointer(local->p2p_sdata, sdata);
 601        }
 602
 603        /*
 604         * set_multicast_list will be invoked by the networking core
 605         * which will check whether any increments here were done in
 606         * error and sync them down to the hardware as filter flags.
 607         */
 608        if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 609                atomic_inc(&local->iff_allmultis);
 610
 611        if (sdata->flags & IEEE80211_SDATA_PROMISC)
 612                atomic_inc(&local->iff_promiscs);
 613
 614        mutex_lock(&local->mtx);
 615        hw_reconf_flags |= __ieee80211_recalc_idle(local);
 616        mutex_unlock(&local->mtx);
 617
 618        if (coming_up)
 619                local->open_count++;
 620
 621        if (hw_reconf_flags)
 622                ieee80211_hw_config(local, hw_reconf_flags);
 623
 624        ieee80211_recalc_ps(local, -1);
 625
 626        if (dev)
 627                netif_tx_start_all_queues(dev);
 628
 629        return 0;
 630 err_del_interface:
 631        drv_remove_interface(local, sdata);
 632 err_stop:
 633        if (!local->open_count)
 634                drv_stop(local);
 635 err_del_bss:
 636        sdata->bss = NULL;
 637        if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
 638                list_del(&sdata->u.vlan.list);
 639        /* might already be clear but that doesn't matter */
 640        clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 641        return res;
 642}
 643
 644static int ieee80211_open(struct net_device *dev)
 645{
 646        struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 647        int err;
 648
 649        /* fail early if user set an invalid address */
 650        if (!is_valid_ether_addr(dev->dev_addr))
 651                return -EADDRNOTAVAIL;
 652
 653        err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
 654        if (err)
 655                return err;
 656
 657        return ieee80211_do_open(&sdata->wdev, true);
 658}
 659
 660static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
 661                              bool going_down)
 662{
 663        struct ieee80211_local *local = sdata->local;
 664        unsigned long flags;
 665        struct sk_buff *skb, *tmp;
 666        u32 hw_reconf_flags = 0;
 667        int i;
 668        enum nl80211_channel_type orig_ct;
 669
 670        clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 671
 672        if (rcu_access_pointer(local->scan_sdata) == sdata)
 673                ieee80211_scan_cancel(local);
 674
 675        /*
 676         * Stop TX on this interface first.
 677         */
 678        if (sdata->dev)
 679                netif_tx_stop_all_queues(sdata->dev);
 680
 681        ieee80211_roc_purge(sdata);
 682
 683        /*
 684         * Remove all stations associated with this interface.
 685         *
 686         * This must be done before calling ops->remove_interface()
 687         * because otherwise we can later invoke ops->sta_notify()
 688         * whenever the STAs are removed, and that invalidates driver
 689         * assumptions about always getting a vif pointer that is valid
 690         * (because if we remove a STA after ops->remove_interface()
 691         * the driver will have removed the vif info already!)
 692         *
 693         * This is relevant only in AP, WDS and mesh modes, since in
 694         * all other modes we've already removed all stations when
 695         * disconnecting etc.
 696         */
 697        sta_info_flush(local, sdata);
 698
 699        /*
 700         * Don't count this interface for promisc/allmulti while it
 701         * is down. dev_mc_unsync() will invoke set_multicast_list
 702         * on the master interface which will sync these down to the
 703         * hardware as filter flags.
 704         */
 705        if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 706                atomic_dec(&local->iff_allmultis);
 707
 708        if (sdata->flags & IEEE80211_SDATA_PROMISC)
 709                atomic_dec(&local->iff_promiscs);
 710
 711        if (sdata->vif.type == NL80211_IFTYPE_AP) {
 712                local->fif_pspoll--;
 713                local->fif_probe_req--;
 714        } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 715                local->fif_probe_req--;
 716        }
 717
 718        if (sdata->dev) {
 719                netif_addr_lock_bh(sdata->dev);
 720                spin_lock_bh(&local->filter_lock);
 721                __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
 722                                 sdata->dev->addr_len);
 723                spin_unlock_bh(&local->filter_lock);
 724                netif_addr_unlock_bh(sdata->dev);
 725
 726                ieee80211_configure_filter(local);
 727        }
 728
 729        del_timer_sync(&local->dynamic_ps_timer);
 730        cancel_work_sync(&local->dynamic_ps_enable_work);
 731
 732        /* APs need special treatment */
 733        if (sdata->vif.type == NL80211_IFTYPE_AP) {
 734                struct ieee80211_sub_if_data *vlan, *tmpsdata;
 735                struct beacon_data *old_beacon =
 736                        rtnl_dereference(sdata->u.ap.beacon);
 737                struct probe_resp *old_probe_resp =
 738                        rtnl_dereference(sdata->u.ap.probe_resp);
 739
 740                /* sdata_running will return false, so this will disable */
 741                ieee80211_bss_info_change_notify(sdata,
 742                                                 BSS_CHANGED_BEACON_ENABLED);
 743
 744                /* remove beacon and probe response */
 745                RCU_INIT_POINTER(sdata->u.ap.beacon, NULL);
 746                RCU_INIT_POINTER(sdata->u.ap.probe_resp, NULL);
 747                synchronize_rcu();
 748                kfree(old_beacon);
 749                kfree(old_probe_resp);
 750
 751                /* down all dependent devices, that is VLANs */
 752                list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
 753                                         u.vlan.list)
 754                        dev_close(vlan->dev);
 755                WARN_ON(!list_empty(&sdata->u.ap.vlans));
 756
 757                /* free all potentially still buffered bcast frames */
 758                local->total_ps_buffered -= skb_queue_len(&sdata->u.ap.ps_bc_buf);
 759                skb_queue_purge(&sdata->u.ap.ps_bc_buf);
 760        } else if (sdata->vif.type == NL80211_IFTYPE_STATION) {
 761                ieee80211_mgd_stop(sdata);
 762        }
 763
 764        if (going_down)
 765                local->open_count--;
 766
 767        switch (sdata->vif.type) {
 768        case NL80211_IFTYPE_AP_VLAN:
 769                list_del(&sdata->u.vlan.list);
 770                /* no need to tell driver */
 771                break;
 772        case NL80211_IFTYPE_MONITOR:
 773                if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 774                        local->cooked_mntrs--;
 775                        break;
 776                }
 777
 778                local->monitors--;
 779                if (local->monitors == 0) {
 780                        local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
 781                        hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 782                        ieee80211_del_virtual_monitor(local);
 783                }
 784
 785                ieee80211_adjust_monitor_flags(sdata, -1);
 786                ieee80211_configure_filter(local);
 787                break;
 788        case NL80211_IFTYPE_P2P_DEVICE:
 789                /* relies on synchronize_rcu() below */
 790                rcu_assign_pointer(local->p2p_sdata, NULL);
 791                /* fall through */
 792        default:
 793                flush_work(&sdata->work);
 794                /*
 795                 * When we get here, the interface is marked down.
 796                 * Call rcu_barrier() to wait both for the RX path
 797                 * should it be using the interface and enqueuing
 798                 * frames at this very time on another CPU, and
 799                 * for the sta free call_rcu callbacks.
 800                 */
 801                rcu_barrier();
 802
 803                /*
 804                 * free_sta_rcu() enqueues a work for the actual
 805                 * sta cleanup, so we need to flush it while
 806                 * sdata is still valid.
 807                 */
 808                flush_workqueue(local->workqueue);
 809
 810                skb_queue_purge(&sdata->skb_queue);
 811
 812                /*
 813                 * Free all remaining keys, there shouldn't be any,
 814                 * except maybe group keys in AP more or WDS?
 815                 */
 816                ieee80211_free_keys(sdata);
 817
 818                if (going_down)
 819                        drv_remove_interface(local, sdata);
 820        }
 821
 822        sdata->bss = NULL;
 823
 824        mutex_lock(&local->mtx);
 825        hw_reconf_flags |= __ieee80211_recalc_idle(local);
 826        mutex_unlock(&local->mtx);
 827
 828        ieee80211_recalc_ps(local, -1);
 829
 830        if (local->open_count == 0) {
 831                if (local->ops->napi_poll)
 832                        napi_disable(&local->napi);
 833                ieee80211_clear_tx_pending(local);
 834                ieee80211_stop_device(local);
 835
 836                /* no reconfiguring after stop! */
 837                hw_reconf_flags = 0;
 838        }
 839
 840        /* Re-calculate channel-type, in case there are multiple vifs
 841         * on different channel types.
 842         */
 843        orig_ct = local->_oper_channel_type;
 844        ieee80211_set_channel_type(local, NULL, NL80211_CHAN_NO_HT);
 845
 846        /* do after stop to avoid reconfiguring when we stop anyway */
 847        if (hw_reconf_flags || (orig_ct != local->_oper_channel_type))
 848                ieee80211_hw_config(local, hw_reconf_flags);
 849
 850        spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 851        for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 852                skb_queue_walk_safe(&local->pending[i], skb, tmp) {
 853                        struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 854                        if (info->control.vif == &sdata->vif) {
 855                                __skb_unlink(skb, &local->pending[i]);
 856                                ieee80211_free_txskb(&local->hw, skb);
 857                        }
 858                }
 859        }
 860        spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 861
 862        if (local->monitors == local->open_count && local->monitors > 0)
 863                ieee80211_add_virtual_monitor(local);
 864}
 865
 866static int ieee80211_stop(struct net_device *dev)
 867{
 868        struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 869
 870        ieee80211_do_stop(sdata, true);
 871
 872        return 0;
 873}
 874
 875static void ieee80211_set_multicast_list(struct net_device *dev)
 876{
 877        struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 878        struct ieee80211_local *local = sdata->local;
 879        int allmulti, promisc, sdata_allmulti, sdata_promisc;
 880
 881        allmulti = !!(dev->flags & IFF_ALLMULTI);
 882        promisc = !!(dev->flags & IFF_PROMISC);
 883        sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
 884        sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
 885
 886        if (allmulti != sdata_allmulti) {
 887                if (dev->flags & IFF_ALLMULTI)
 888                        atomic_inc(&local->iff_allmultis);
 889                else
 890                        atomic_dec(&local->iff_allmultis);
 891                sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
 892        }
 893
 894        if (promisc != sdata_promisc) {
 895                if (dev->flags & IFF_PROMISC)
 896                        atomic_inc(&local->iff_promiscs);
 897                else
 898                        atomic_dec(&local->iff_promiscs);
 899                sdata->flags ^= IEEE80211_SDATA_PROMISC;
 900        }
 901        spin_lock_bh(&local->filter_lock);
 902        __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
 903        spin_unlock_bh(&local->filter_lock);
 904        ieee80211_queue_work(&local->hw, &local->reconfig_filter);
 905}
 906
 907/*
 908 * Called when the netdev is removed or, by the code below, before
 909 * the interface type changes.
 910 */
 911static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
 912{
 913        struct ieee80211_local *local = sdata->local;
 914        int flushed;
 915        int i;
 916
 917        /* free extra data */
 918        ieee80211_free_keys(sdata);
 919
 920        ieee80211_debugfs_remove_netdev(sdata);
 921
 922        for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
 923                __skb_queue_purge(&sdata->fragments[i].skb_list);
 924        sdata->fragment_next = 0;
 925
 926        if (ieee80211_vif_is_mesh(&sdata->vif))
 927                mesh_rmc_free(sdata);
 928
 929        flushed = sta_info_flush(local, sdata);
 930        WARN_ON(flushed);
 931}
 932
 933static void ieee80211_uninit(struct net_device *dev)
 934{
 935        ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
 936}
 937
 938static u16 ieee80211_netdev_select_queue(struct net_device *dev,
 939                                         struct sk_buff *skb)
 940{
 941        return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
 942}
 943
 944static const struct net_device_ops ieee80211_dataif_ops = {
 945        .ndo_open               = ieee80211_open,
 946        .ndo_stop               = ieee80211_stop,
 947        .ndo_uninit             = ieee80211_uninit,
 948        .ndo_start_xmit         = ieee80211_subif_start_xmit,
 949        .ndo_set_rx_mode        = ieee80211_set_multicast_list,
 950        .ndo_change_mtu         = ieee80211_change_mtu,
 951        .ndo_set_mac_address    = ieee80211_change_mac,
 952        .ndo_select_queue       = ieee80211_netdev_select_queue,
 953};
 954
 955static u16 ieee80211_monitor_select_queue(struct net_device *dev,
 956                                          struct sk_buff *skb)
 957{
 958        struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 959        struct ieee80211_local *local = sdata->local;
 960        struct ieee80211_hdr *hdr;
 961        struct ieee80211_radiotap_header *rtap = (void *)skb->data;
 962
 963        if (local->hw.queues < IEEE80211_NUM_ACS)
 964                return 0;
 965
 966        if (skb->len < 4 ||
 967            skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
 968                return 0; /* doesn't matter, frame will be dropped */
 969
 970        hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
 971
 972        return ieee80211_select_queue_80211(sdata, skb, hdr);
 973}
 974
 975static const struct net_device_ops ieee80211_monitorif_ops = {
 976        .ndo_open               = ieee80211_open,
 977        .ndo_stop               = ieee80211_stop,
 978        .ndo_uninit             = ieee80211_uninit,
 979        .ndo_start_xmit         = ieee80211_monitor_start_xmit,
 980        .ndo_set_rx_mode        = ieee80211_set_multicast_list,
 981        .ndo_change_mtu         = ieee80211_change_mtu,
 982        .ndo_set_mac_address    = eth_mac_addr,
 983        .ndo_select_queue       = ieee80211_monitor_select_queue,
 984};
 985
 986static void ieee80211_if_setup(struct net_device *dev)
 987{
 988        ether_setup(dev);
 989        dev->priv_flags &= ~IFF_TX_SKB_SHARING;
 990        dev->netdev_ops = &ieee80211_dataif_ops;
 991        dev->destructor = free_netdev;
 992}
 993
 994static void ieee80211_iface_work(struct work_struct *work)
 995{
 996        struct ieee80211_sub_if_data *sdata =
 997                container_of(work, struct ieee80211_sub_if_data, work);
 998        struct ieee80211_local *local = sdata->local;
 999        struct sk_buff *skb;
1000        struct sta_info *sta;
1001        struct ieee80211_ra_tid *ra_tid;
1002
1003        if (!ieee80211_sdata_running(sdata))
1004                return;
1005
1006        if (local->scanning)
1007                return;
1008
1009        /*
1010         * ieee80211_queue_work() should have picked up most cases,
1011         * here we'll pick the rest.
1012         */
1013        if (WARN(local->suspended,
1014                 "interface work scheduled while going to suspend\n"))
1015                return;
1016
1017        /* first process frames */
1018        while ((skb = skb_dequeue(&sdata->skb_queue))) {
1019                struct ieee80211_mgmt *mgmt = (void *)skb->data;
1020
1021                if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
1022                        ra_tid = (void *)&skb->cb;
1023                        ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
1024                                                 ra_tid->tid);
1025                } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
1026                        ra_tid = (void *)&skb->cb;
1027                        ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
1028                                                ra_tid->tid);
1029                } else if (ieee80211_is_action(mgmt->frame_control) &&
1030                           mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1031                        int len = skb->len;
1032
1033                        mutex_lock(&local->sta_mtx);
1034                        sta = sta_info_get_bss(sdata, mgmt->sa);
1035                        if (sta) {
1036                                switch (mgmt->u.action.u.addba_req.action_code) {
1037                                case WLAN_ACTION_ADDBA_REQ:
1038                                        ieee80211_process_addba_request(
1039                                                        local, sta, mgmt, len);
1040                                        break;
1041                                case WLAN_ACTION_ADDBA_RESP:
1042                                        ieee80211_process_addba_resp(local, sta,
1043                                                                     mgmt, len);
1044                                        break;
1045                                case WLAN_ACTION_DELBA:
1046                                        ieee80211_process_delba(sdata, sta,
1047                                                                mgmt, len);
1048                                        break;
1049                                default:
1050                                        WARN_ON(1);
1051                                        break;
1052                                }
1053                        }
1054                        mutex_unlock(&local->sta_mtx);
1055                } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1056                        struct ieee80211_hdr *hdr = (void *)mgmt;
1057                        /*
1058                         * So the frame isn't mgmt, but frame_control
1059                         * is at the right place anyway, of course, so
1060                         * the if statement is correct.
1061                         *
1062                         * Warn if we have other data frame types here,
1063                         * they must not get here.
1064                         */
1065                        WARN_ON(hdr->frame_control &
1066                                        cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1067                        WARN_ON(!(hdr->seq_ctrl &
1068                                        cpu_to_le16(IEEE80211_SCTL_FRAG)));
1069                        /*
1070                         * This was a fragment of a frame, received while
1071                         * a block-ack session was active. That cannot be
1072                         * right, so terminate the session.
1073                         */
1074                        mutex_lock(&local->sta_mtx);
1075                        sta = sta_info_get_bss(sdata, mgmt->sa);
1076                        if (sta) {
1077                                u16 tid = *ieee80211_get_qos_ctl(hdr) &
1078                                                IEEE80211_QOS_CTL_TID_MASK;
1079
1080                                __ieee80211_stop_rx_ba_session(
1081                                        sta, tid, WLAN_BACK_RECIPIENT,
1082                                        WLAN_REASON_QSTA_REQUIRE_SETUP,
1083                                        true);
1084                        }
1085                        mutex_unlock(&local->sta_mtx);
1086                } else switch (sdata->vif.type) {
1087                case NL80211_IFTYPE_STATION:
1088                        ieee80211_sta_rx_queued_mgmt(sdata, skb);
1089                        break;
1090                case NL80211_IFTYPE_ADHOC:
1091                        ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1092                        break;
1093                case NL80211_IFTYPE_MESH_POINT:
1094                        if (!ieee80211_vif_is_mesh(&sdata->vif))
1095                                break;
1096                        ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1097                        break;
1098                default:
1099                        WARN(1, "frame for unexpected interface type");
1100                        break;
1101                }
1102
1103                kfree_skb(skb);
1104        }
1105
1106        /* then other type-dependent work */
1107        switch (sdata->vif.type) {
1108        case NL80211_IFTYPE_STATION:
1109                ieee80211_sta_work(sdata);
1110                break;
1111        case NL80211_IFTYPE_ADHOC:
1112                ieee80211_ibss_work(sdata);
1113                break;
1114        case NL80211_IFTYPE_MESH_POINT:
1115                if (!ieee80211_vif_is_mesh(&sdata->vif))
1116                        break;
1117                ieee80211_mesh_work(sdata);
1118                break;
1119        default:
1120                break;
1121        }
1122}
1123
1124
1125/*
1126 * Helper function to initialise an interface to a specific type.
1127 */
1128static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1129                                  enum nl80211_iftype type)
1130{
1131        /* clear type-dependent union */
1132        memset(&sdata->u, 0, sizeof(sdata->u));
1133
1134        /* and set some type-dependent values */
1135        sdata->vif.type = type;
1136        sdata->vif.p2p = false;
1137        sdata->wdev.iftype = type;
1138
1139        sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1140        sdata->control_port_no_encrypt = false;
1141
1142        sdata->noack_map = 0;
1143
1144        /* only monitor/p2p-device differ */
1145        if (sdata->dev) {
1146                sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1147                sdata->dev->type = ARPHRD_ETHER;
1148        }
1149
1150        skb_queue_head_init(&sdata->skb_queue);
1151        INIT_WORK(&sdata->work, ieee80211_iface_work);
1152
1153        switch (type) {
1154        case NL80211_IFTYPE_P2P_GO:
1155                type = NL80211_IFTYPE_AP;
1156                sdata->vif.type = type;
1157                sdata->vif.p2p = true;
1158                /* fall through */
1159        case NL80211_IFTYPE_AP:
1160                skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
1161                INIT_LIST_HEAD(&sdata->u.ap.vlans);
1162                break;
1163        case NL80211_IFTYPE_P2P_CLIENT:
1164                type = NL80211_IFTYPE_STATION;
1165                sdata->vif.type = type;
1166                sdata->vif.p2p = true;
1167                /* fall through */
1168        case NL80211_IFTYPE_STATION:
1169                ieee80211_sta_setup_sdata(sdata);
1170                break;
1171        case NL80211_IFTYPE_ADHOC:
1172                ieee80211_ibss_setup_sdata(sdata);
1173                break;
1174        case NL80211_IFTYPE_MESH_POINT:
1175                if (ieee80211_vif_is_mesh(&sdata->vif))
1176                        ieee80211_mesh_init_sdata(sdata);
1177                break;
1178        case NL80211_IFTYPE_MONITOR:
1179                sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1180                sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1181                sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
1182                                      MONITOR_FLAG_OTHER_BSS;
1183                break;
1184        case NL80211_IFTYPE_WDS:
1185        case NL80211_IFTYPE_AP_VLAN:
1186        case NL80211_IFTYPE_P2P_DEVICE:
1187                break;
1188        case NL80211_IFTYPE_UNSPECIFIED:
1189        case NUM_NL80211_IFTYPES:
1190                BUG();
1191                break;
1192        }
1193
1194        ieee80211_debugfs_add_netdev(sdata);
1195}
1196
1197static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1198                                           enum nl80211_iftype type)
1199{
1200        struct ieee80211_local *local = sdata->local;
1201        int ret, err;
1202        enum nl80211_iftype internal_type = type;
1203        bool p2p = false;
1204
1205        ASSERT_RTNL();
1206
1207        if (!local->ops->change_interface)
1208                return -EBUSY;
1209
1210        switch (sdata->vif.type) {
1211        case NL80211_IFTYPE_AP:
1212        case NL80211_IFTYPE_STATION:
1213        case NL80211_IFTYPE_ADHOC:
1214                /*
1215                 * Could maybe also all others here?
1216                 * Just not sure how that interacts
1217                 * with the RX/config path e.g. for
1218                 * mesh.
1219                 */
1220                break;
1221        default:
1222                return -EBUSY;
1223        }
1224
1225        switch (type) {
1226        case NL80211_IFTYPE_AP:
1227        case NL80211_IFTYPE_STATION:
1228        case NL80211_IFTYPE_ADHOC:
1229                /*
1230                 * Could probably support everything
1231                 * but WDS here (WDS do_open can fail
1232                 * under memory pressure, which this
1233                 * code isn't prepared to handle).
1234                 */
1235                break;
1236        case NL80211_IFTYPE_P2P_CLIENT:
1237                p2p = true;
1238                internal_type = NL80211_IFTYPE_STATION;
1239                break;
1240        case NL80211_IFTYPE_P2P_GO:
1241                p2p = true;
1242                internal_type = NL80211_IFTYPE_AP;
1243                break;
1244        default:
1245                return -EBUSY;
1246        }
1247
1248        ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1249        if (ret)
1250                return ret;
1251
1252        ieee80211_do_stop(sdata, false);
1253
1254        ieee80211_teardown_sdata(sdata);
1255
1256        ret = drv_change_interface(local, sdata, internal_type, p2p);
1257        if (ret)
1258                type = sdata->vif.type;
1259
1260        /*
1261         * Ignore return value here, there's not much we can do since
1262         * the driver changed the interface type internally already.
1263         * The warnings will hopefully make driver authors fix it :-)
1264         */
1265        ieee80211_check_queues(sdata);
1266
1267        ieee80211_setup_sdata(sdata, type);
1268
1269        err = ieee80211_do_open(&sdata->wdev, false);
1270        WARN(err, "type change: do_open returned %d", err);
1271
1272        return ret;
1273}
1274
1275int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1276                             enum nl80211_iftype type)
1277{
1278        int ret;
1279
1280        ASSERT_RTNL();
1281
1282        if (type == ieee80211_vif_type_p2p(&sdata->vif))
1283                return 0;
1284
1285        /* Setting ad-hoc mode on non-IBSS channel is not supported. */
1286        if (sdata->local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS &&
1287            type == NL80211_IFTYPE_ADHOC)
1288                return -EOPNOTSUPP;
1289
1290        if (ieee80211_sdata_running(sdata)) {
1291                ret = ieee80211_runtime_change_iftype(sdata, type);
1292                if (ret)
1293                        return ret;
1294        } else {
1295                /* Purge and reset type-dependent state. */
1296                ieee80211_teardown_sdata(sdata);
1297                ieee80211_setup_sdata(sdata, type);
1298        }
1299
1300        /* reset some values that shouldn't be kept across type changes */
1301        sdata->vif.bss_conf.basic_rates =
1302                ieee80211_mandatory_rates(sdata->local,
1303                        sdata->local->oper_channel->band);
1304        sdata->drop_unencrypted = 0;
1305        if (type == NL80211_IFTYPE_STATION)
1306                sdata->u.mgd.use_4addr = false;
1307
1308        return 0;
1309}
1310
1311static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1312                                       u8 *perm_addr, enum nl80211_iftype type)
1313{
1314        struct ieee80211_sub_if_data *sdata;
1315        u64 mask, start, addr, val, inc;
1316        u8 *m;
1317        u8 tmp_addr[ETH_ALEN];
1318        int i;
1319
1320        /* default ... something at least */
1321        memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1322
1323        if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1324            local->hw.wiphy->n_addresses <= 1)
1325                return;
1326
1327        mutex_lock(&local->iflist_mtx);
1328
1329        switch (type) {
1330        case NL80211_IFTYPE_MONITOR:
1331                /* doesn't matter */
1332                break;
1333        case NL80211_IFTYPE_WDS:
1334        case NL80211_IFTYPE_AP_VLAN:
1335                /* match up with an AP interface */
1336                list_for_each_entry(sdata, &local->interfaces, list) {
1337                        if (sdata->vif.type != NL80211_IFTYPE_AP)
1338                                continue;
1339                        memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1340                        break;
1341                }
1342                /* keep default if no AP interface present */
1343                break;
1344        case NL80211_IFTYPE_P2P_CLIENT:
1345        case NL80211_IFTYPE_P2P_GO:
1346                if (local->hw.flags & IEEE80211_HW_P2P_DEV_ADDR_FOR_INTF) {
1347                        list_for_each_entry(sdata, &local->interfaces, list) {
1348                                if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1349                                        continue;
1350                                if (!ieee80211_sdata_running(sdata))
1351                                        continue;
1352                                memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1353                                goto out_unlock;
1354                        }
1355                }
1356                /* otherwise fall through */
1357        default:
1358                /* assign a new address if possible -- try n_addresses first */
1359                for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1360                        bool used = false;
1361
1362                        list_for_each_entry(sdata, &local->interfaces, list) {
1363                                if (memcmp(local->hw.wiphy->addresses[i].addr,
1364                                           sdata->vif.addr, ETH_ALEN) == 0) {
1365                                        used = true;
1366                                        break;
1367                                }
1368                        }
1369
1370                        if (!used) {
1371                                memcpy(perm_addr,
1372                                       local->hw.wiphy->addresses[i].addr,
1373                                       ETH_ALEN);
1374                                break;
1375                        }
1376                }
1377
1378                /* try mask if available */
1379                if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1380                        break;
1381
1382                m = local->hw.wiphy->addr_mask;
1383                mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1384                        ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1385                        ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1386
1387                if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1388                        /* not a contiguous mask ... not handled now! */
1389                        pr_info("not contiguous\n");
1390                        break;
1391                }
1392
1393                m = local->hw.wiphy->perm_addr;
1394                start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1395                        ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1396                        ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1397
1398                inc = 1ULL<<__ffs64(mask);
1399                val = (start & mask);
1400                addr = (start & ~mask) | (val & mask);
1401                do {
1402                        bool used = false;
1403
1404                        tmp_addr[5] = addr >> 0*8;
1405                        tmp_addr[4] = addr >> 1*8;
1406                        tmp_addr[3] = addr >> 2*8;
1407                        tmp_addr[2] = addr >> 3*8;
1408                        tmp_addr[1] = addr >> 4*8;
1409                        tmp_addr[0] = addr >> 5*8;
1410
1411                        val += inc;
1412
1413                        list_for_each_entry(sdata, &local->interfaces, list) {
1414                                if (memcmp(tmp_addr, sdata->vif.addr,
1415                                                        ETH_ALEN) == 0) {
1416                                        used = true;
1417                                        break;
1418                                }
1419                        }
1420
1421                        if (!used) {
1422                                memcpy(perm_addr, tmp_addr, ETH_ALEN);
1423                                break;
1424                        }
1425                        addr = (start & ~mask) | (val & mask);
1426                } while (addr != start);
1427
1428                break;
1429        }
1430
1431 out_unlock:
1432        mutex_unlock(&local->iflist_mtx);
1433}
1434
1435int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1436                     struct wireless_dev **new_wdev, enum nl80211_iftype type,
1437                     struct vif_params *params)
1438{
1439        struct net_device *ndev = NULL;
1440        struct ieee80211_sub_if_data *sdata = NULL;
1441        int ret, i;
1442        int txqs = 1;
1443
1444        ASSERT_RTNL();
1445
1446        if (type == NL80211_IFTYPE_P2P_DEVICE) {
1447                struct wireless_dev *wdev;
1448
1449                sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1450                                GFP_KERNEL);
1451                if (!sdata)
1452                        return -ENOMEM;
1453                wdev = &sdata->wdev;
1454
1455                sdata->dev = NULL;
1456                strlcpy(sdata->name, name, IFNAMSIZ);
1457                ieee80211_assign_perm_addr(local, wdev->address, type);
1458                memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1459        } else {
1460                if (local->hw.queues >= IEEE80211_NUM_ACS)
1461                        txqs = IEEE80211_NUM_ACS;
1462
1463                ndev = alloc_netdev_mqs(sizeof(*sdata) +
1464                                        local->hw.vif_data_size,
1465                                        name, ieee80211_if_setup, txqs, 1);
1466                if (!ndev)
1467                        return -ENOMEM;
1468                dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1469
1470                ndev->needed_headroom = local->tx_headroom +
1471                                        4*6 /* four MAC addresses */
1472                                        + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1473                                        + 6 /* mesh */
1474                                        + 8 /* rfc1042/bridge tunnel */
1475                                        - ETH_HLEN /* ethernet hard_header_len */
1476                                        + IEEE80211_ENCRYPT_HEADROOM;
1477                ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1478
1479                ret = dev_alloc_name(ndev, ndev->name);
1480                if (ret < 0) {
1481                        free_netdev(ndev);
1482                        return ret;
1483                }
1484
1485                ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1486                memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1487                SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1488
1489                /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1490                sdata = netdev_priv(ndev);
1491                ndev->ieee80211_ptr = &sdata->wdev;
1492                memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1493                memcpy(sdata->name, ndev->name, IFNAMSIZ);
1494
1495                sdata->dev = ndev;
1496        }
1497
1498        /* initialise type-independent data */
1499        sdata->wdev.wiphy = local->hw.wiphy;
1500        sdata->local = local;
1501#ifdef CONFIG_INET
1502        sdata->arp_filter_state = true;
1503#endif
1504
1505        for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1506                skb_queue_head_init(&sdata->fragments[i].skb_list);
1507
1508        INIT_LIST_HEAD(&sdata->key_list);
1509
1510        for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1511                struct ieee80211_supported_band *sband;
1512                sband = local->hw.wiphy->bands[i];
1513                sdata->rc_rateidx_mask[i] =
1514                        sband ? (1 << sband->n_bitrates) - 1 : 0;
1515                if (sband)
1516                        memcpy(sdata->rc_rateidx_mcs_mask[i],
1517                               sband->ht_cap.mcs.rx_mask,
1518                               sizeof(sdata->rc_rateidx_mcs_mask[i]));
1519                else
1520                        memset(sdata->rc_rateidx_mcs_mask[i], 0,
1521                               sizeof(sdata->rc_rateidx_mcs_mask[i]));
1522        }
1523
1524        ieee80211_set_default_queues(sdata);
1525
1526        /* setup type-dependent data */
1527        ieee80211_setup_sdata(sdata, type);
1528
1529        if (ndev) {
1530                if (params) {
1531                        ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1532                        if (type == NL80211_IFTYPE_STATION)
1533                                sdata->u.mgd.use_4addr = params->use_4addr;
1534                }
1535
1536                ndev->features |= local->hw.netdev_features;
1537
1538                ret = register_netdevice(ndev);
1539                if (ret) {
1540                        free_netdev(ndev);
1541                        return ret;
1542                }
1543        }
1544
1545        mutex_lock(&local->iflist_mtx);
1546        list_add_tail_rcu(&sdata->list, &local->interfaces);
1547        mutex_unlock(&local->iflist_mtx);
1548
1549        if (new_wdev)
1550                *new_wdev = &sdata->wdev;
1551
1552        return 0;
1553}
1554
1555void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1556{
1557        ASSERT_RTNL();
1558
1559        mutex_lock(&sdata->local->iflist_mtx);
1560        list_del_rcu(&sdata->list);
1561        mutex_unlock(&sdata->local->iflist_mtx);
1562
1563        synchronize_rcu();
1564
1565        if (sdata->dev) {
1566                unregister_netdevice(sdata->dev);
1567        } else {
1568                cfg80211_unregister_wdev(&sdata->wdev);
1569                kfree(sdata);
1570        }
1571}
1572
1573void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
1574{
1575        if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
1576                return;
1577        ieee80211_do_stop(sdata, true);
1578        ieee80211_teardown_sdata(sdata);
1579}
1580
1581/*
1582 * Remove all interfaces, may only be called at hardware unregistration
1583 * time because it doesn't do RCU-safe list removals.
1584 */
1585void ieee80211_remove_interfaces(struct ieee80211_local *local)
1586{
1587        struct ieee80211_sub_if_data *sdata, *tmp;
1588        LIST_HEAD(unreg_list);
1589        LIST_HEAD(wdev_list);
1590
1591        ASSERT_RTNL();
1592
1593        mutex_lock(&local->iflist_mtx);
1594        list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1595                list_del(&sdata->list);
1596
1597                if (sdata->dev)
1598                        unregister_netdevice_queue(sdata->dev, &unreg_list);
1599                else
1600                        list_add(&sdata->list, &wdev_list);
1601        }
1602        mutex_unlock(&local->iflist_mtx);
1603        unregister_netdevice_many(&unreg_list);
1604        list_del(&unreg_list);
1605
1606        list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
1607                list_del(&sdata->list);
1608                cfg80211_unregister_wdev(&sdata->wdev);
1609                kfree(sdata);
1610        }
1611}
1612
1613static int netdev_notify(struct notifier_block *nb,
1614                         unsigned long state,
1615                         void *ndev)
1616{
1617        struct net_device *dev = ndev;
1618        struct ieee80211_sub_if_data *sdata;
1619
1620        if (state != NETDEV_CHANGENAME)
1621                return 0;
1622
1623        if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1624                return 0;
1625
1626        if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1627                return 0;
1628
1629        sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1630
1631        memcpy(sdata->name, dev->name, IFNAMSIZ);
1632
1633        ieee80211_debugfs_rename_netdev(sdata);
1634        return 0;
1635}
1636
1637static struct notifier_block mac80211_netdev_notifier = {
1638        .notifier_call = netdev_notify,
1639};
1640
1641int ieee80211_iface_init(void)
1642{
1643        return register_netdevice_notifier(&mac80211_netdev_notifier);
1644}
1645
1646void ieee80211_iface_exit(void)
1647{
1648        unregister_netdevice_notifier(&mac80211_netdev_notifier);
1649}
1650
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