linux/net/mac80211/iface.c
<<
>>
Prefs
   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                /* count everything else */
 104                sdata->vif.bss_conf.idle = false;
 105                count++;
 106        }
 107
 108        if (!local->ops->remain_on_channel) {
 109                list_for_each_entry(roc, &local->roc_list, list) {
 110                        working = true;
 111                        roc->sdata->vif.bss_conf.idle = false;
 112                }
 113        }
 114
 115        sdata = rcu_dereference_protected(local->scan_sdata,
 116                                          lockdep_is_held(&local->mtx));
 117        if (sdata && !(local->hw.flags & IEEE80211_HW_SCAN_WHILE_IDLE)) {
 118                scanning = true;
 119                sdata->vif.bss_conf.idle = false;
 120        }
 121
 122        list_for_each_entry(sdata, &local->interfaces, list) {
 123                if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
 124                    sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
 125                        continue;
 126                if (sdata->old_idle == sdata->vif.bss_conf.idle)
 127                        continue;
 128                if (!ieee80211_sdata_running(sdata))
 129                        continue;
 130                ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_IDLE);
 131        }
 132
 133        if (working || scanning)
 134                led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
 135        else
 136                led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
 137
 138        if (count)
 139                led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
 140        else
 141                led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
 142
 143        ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
 144
 145        if (working)
 146                return ieee80211_idle_off(local, "working");
 147        if (scanning)
 148                return ieee80211_idle_off(local, "scanning");
 149        if (!count)
 150                return ieee80211_idle_on(local);
 151        else
 152                return ieee80211_idle_off(local, "in use");
 153
 154        return 0;
 155}
 156
 157void ieee80211_recalc_idle(struct ieee80211_local *local)
 158{
 159        u32 chg;
 160
 161        mutex_lock(&local->iflist_mtx);
 162        chg = __ieee80211_recalc_idle(local);
 163        mutex_unlock(&local->iflist_mtx);
 164        if (chg)
 165                ieee80211_hw_config(local, chg);
 166}
 167
 168static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
 169{
 170        int meshhdrlen;
 171        struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 172
 173        meshhdrlen = (sdata->vif.type == NL80211_IFTYPE_MESH_POINT) ? 5 : 0;
 174
 175        /* FIX: what would be proper limits for MTU?
 176         * This interface uses 802.3 frames. */
 177        if (new_mtu < 256 ||
 178            new_mtu > IEEE80211_MAX_DATA_LEN - 24 - 6 - meshhdrlen) {
 179                return -EINVAL;
 180        }
 181
 182        dev->mtu = new_mtu;
 183        return 0;
 184}
 185
 186static int ieee80211_change_mac(struct net_device *dev, void *addr)
 187{
 188        struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 189        struct sockaddr *sa = addr;
 190        int ret;
 191
 192        if (ieee80211_sdata_running(sdata))
 193                return -EBUSY;
 194
 195        ret = eth_mac_addr(dev, sa);
 196
 197        if (ret == 0)
 198                memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
 199
 200        return ret;
 201}
 202
 203static inline int identical_mac_addr_allowed(int type1, int type2)
 204{
 205        return type1 == NL80211_IFTYPE_MONITOR ||
 206                type2 == NL80211_IFTYPE_MONITOR ||
 207                (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
 208                (type1 == NL80211_IFTYPE_WDS &&
 209                        (type2 == NL80211_IFTYPE_WDS ||
 210                         type2 == NL80211_IFTYPE_AP)) ||
 211                (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
 212                (type1 == NL80211_IFTYPE_AP_VLAN &&
 213                        (type2 == NL80211_IFTYPE_AP ||
 214                         type2 == NL80211_IFTYPE_AP_VLAN));
 215}
 216
 217static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
 218                                            enum nl80211_iftype iftype)
 219{
 220        struct ieee80211_local *local = sdata->local;
 221        struct ieee80211_sub_if_data *nsdata;
 222
 223        ASSERT_RTNL();
 224
 225        /* we hold the RTNL here so can safely walk the list */
 226        list_for_each_entry(nsdata, &local->interfaces, list) {
 227                if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
 228                        /*
 229                         * Allow only a single IBSS interface to be up at any
 230                         * time. This is restricted because beacon distribution
 231                         * cannot work properly if both are in the same IBSS.
 232                         *
 233                         * To remove this restriction we'd have to disallow them
 234                         * from setting the same SSID on different IBSS interfaces
 235                         * belonging to the same hardware. Then, however, we're
 236                         * faced with having to adopt two different TSF timers...
 237                         */
 238                        if (iftype == NL80211_IFTYPE_ADHOC &&
 239                            nsdata->vif.type == NL80211_IFTYPE_ADHOC)
 240                                return -EBUSY;
 241
 242                        /*
 243                         * The remaining checks are only performed for interfaces
 244                         * with the same MAC address.
 245                         */
 246                        if (!ether_addr_equal(sdata->vif.addr,
 247                                              nsdata->vif.addr))
 248                                continue;
 249
 250                        /*
 251                         * check whether it may have the same address
 252                         */
 253                        if (!identical_mac_addr_allowed(iftype,
 254                                                        nsdata->vif.type))
 255                                return -ENOTUNIQ;
 256
 257                        /*
 258                         * can only add VLANs to enabled APs
 259                         */
 260                        if (iftype == NL80211_IFTYPE_AP_VLAN &&
 261                            nsdata->vif.type == NL80211_IFTYPE_AP)
 262                                sdata->bss = &nsdata->u.ap;
 263                }
 264        }
 265
 266        return 0;
 267}
 268
 269static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata)
 270{
 271        int n_queues = sdata->local->hw.queues;
 272        int i;
 273
 274        for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 275                if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
 276                                 IEEE80211_INVAL_HW_QUEUE))
 277                        return -EINVAL;
 278                if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
 279                                 n_queues))
 280                        return -EINVAL;
 281        }
 282
 283        if ((sdata->vif.type != NL80211_IFTYPE_AP) ||
 284            !(sdata->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)) {
 285                sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
 286                return 0;
 287        }
 288
 289        if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
 290                return -EINVAL;
 291
 292        if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
 293                return -EINVAL;
 294
 295        return 0;
 296}
 297
 298void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
 299                                    const int offset)
 300{
 301        struct ieee80211_local *local = sdata->local;
 302        u32 flags = sdata->u.mntr_flags;
 303
 304#define ADJUST(_f, _s)  do {                                    \
 305        if (flags & MONITOR_FLAG_##_f)                          \
 306                local->fif_##_s += offset;                      \
 307        } while (0)
 308
 309        ADJUST(FCSFAIL, fcsfail);
 310        ADJUST(PLCPFAIL, plcpfail);
 311        ADJUST(CONTROL, control);
 312        ADJUST(CONTROL, pspoll);
 313        ADJUST(OTHER_BSS, other_bss);
 314
 315#undef ADJUST
 316}
 317
 318static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
 319{
 320        struct ieee80211_local *local = sdata->local;
 321        int i;
 322
 323        for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 324                if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
 325                        sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
 326                else if (local->hw.queues >= IEEE80211_NUM_ACS)
 327                        sdata->vif.hw_queue[i] = i;
 328                else
 329                        sdata->vif.hw_queue[i] = 0;
 330        }
 331        sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
 332}
 333
 334static int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
 335{
 336        struct ieee80211_sub_if_data *sdata;
 337        int ret = 0;
 338
 339        if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
 340                return 0;
 341
 342        mutex_lock(&local->iflist_mtx);
 343
 344        if (local->monitor_sdata)
 345                goto out_unlock;
 346
 347        sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
 348        if (!sdata) {
 349                ret = -ENOMEM;
 350                goto out_unlock;
 351        }
 352
 353        /* set up data */
 354        sdata->local = local;
 355        sdata->vif.type = NL80211_IFTYPE_MONITOR;
 356        snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
 357                 wiphy_name(local->hw.wiphy));
 358
 359        ieee80211_set_default_queues(sdata);
 360
 361        ret = drv_add_interface(local, sdata);
 362        if (WARN_ON(ret)) {
 363                /* ok .. stupid driver, it asked for this! */
 364                kfree(sdata);
 365                goto out_unlock;
 366        }
 367
 368        ret = ieee80211_check_queues(sdata);
 369        if (ret) {
 370                kfree(sdata);
 371                goto out_unlock;
 372        }
 373
 374        rcu_assign_pointer(local->monitor_sdata, sdata);
 375 out_unlock:
 376        mutex_unlock(&local->iflist_mtx);
 377        return ret;
 378}
 379
 380static void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
 381{
 382        struct ieee80211_sub_if_data *sdata;
 383
 384        if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
 385                return;
 386
 387        mutex_lock(&local->iflist_mtx);
 388
 389        sdata = rcu_dereference_protected(local->monitor_sdata,
 390                                          lockdep_is_held(&local->iflist_mtx));
 391        if (!sdata)
 392                goto out_unlock;
 393
 394        rcu_assign_pointer(local->monitor_sdata, NULL);
 395        synchronize_net();
 396
 397        drv_remove_interface(local, sdata);
 398
 399        kfree(sdata);
 400 out_unlock:
 401        mutex_unlock(&local->iflist_mtx);
 402}
 403
 404/*
 405 * NOTE: Be very careful when changing this function, it must NOT return
 406 * an error on interface type changes that have been pre-checked, so most
 407 * checks should be in ieee80211_check_concurrent_iface.
 408 */
 409static int ieee80211_do_open(struct net_device *dev, bool coming_up)
 410{
 411        struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 412        struct ieee80211_local *local = sdata->local;
 413        struct sta_info *sta;
 414        u32 changed = 0;
 415        int res;
 416        u32 hw_reconf_flags = 0;
 417
 418        switch (sdata->vif.type) {
 419        case NL80211_IFTYPE_WDS:
 420                if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
 421                        return -ENOLINK;
 422                break;
 423        case NL80211_IFTYPE_AP_VLAN: {
 424                struct ieee80211_sub_if_data *master;
 425
 426                if (!sdata->bss)
 427                        return -ENOLINK;
 428
 429                list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
 430
 431                master = container_of(sdata->bss,
 432                                      struct ieee80211_sub_if_data, u.ap);
 433                sdata->control_port_protocol =
 434                        master->control_port_protocol;
 435                sdata->control_port_no_encrypt =
 436                        master->control_port_no_encrypt;
 437                break;
 438                }
 439        case NL80211_IFTYPE_AP:
 440                sdata->bss = &sdata->u.ap;
 441                break;
 442        case NL80211_IFTYPE_MESH_POINT:
 443        case NL80211_IFTYPE_STATION:
 444        case NL80211_IFTYPE_MONITOR:
 445        case NL80211_IFTYPE_ADHOC:
 446                /* no special treatment */
 447                break;
 448        case NL80211_IFTYPE_UNSPECIFIED:
 449        case NUM_NL80211_IFTYPES:
 450        case NL80211_IFTYPE_P2P_CLIENT:
 451        case NL80211_IFTYPE_P2P_GO:
 452                /* cannot happen */
 453                WARN_ON(1);
 454                break;
 455        }
 456
 457        if (local->open_count == 0) {
 458                res = drv_start(local);
 459                if (res)
 460                        goto err_del_bss;
 461                if (local->ops->napi_poll)
 462                        napi_enable(&local->napi);
 463                /* we're brought up, everything changes */
 464                hw_reconf_flags = ~0;
 465                ieee80211_led_radio(local, true);
 466                ieee80211_mod_tpt_led_trig(local,
 467                                           IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
 468        }
 469
 470        /*
 471         * Copy the hopefully now-present MAC address to
 472         * this interface, if it has the special null one.
 473         */
 474        if (is_zero_ether_addr(dev->dev_addr)) {
 475                memcpy(dev->dev_addr,
 476                       local->hw.wiphy->perm_addr,
 477                       ETH_ALEN);
 478                memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
 479
 480                if (!is_valid_ether_addr(dev->dev_addr)) {
 481                        res = -EADDRNOTAVAIL;
 482                        goto err_stop;
 483                }
 484        }
 485
 486        switch (sdata->vif.type) {
 487        case NL80211_IFTYPE_AP_VLAN:
 488                /* no need to tell driver, but set carrier */
 489                if (rtnl_dereference(sdata->bss->beacon))
 490                        netif_carrier_on(dev);
 491                else
 492                        netif_carrier_off(dev);
 493                break;
 494        case NL80211_IFTYPE_MONITOR:
 495                if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 496                        local->cooked_mntrs++;
 497                        break;
 498                }
 499
 500                if (local->monitors == 0 && local->open_count == 0) {
 501                        res = ieee80211_add_virtual_monitor(local);
 502                        if (res)
 503                                goto err_stop;
 504                }
 505
 506                /* must be before the call to ieee80211_configure_filter */
 507                local->monitors++;
 508                if (local->monitors == 1) {
 509                        local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
 510                        hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 511                }
 512
 513                ieee80211_adjust_monitor_flags(sdata, 1);
 514                ieee80211_configure_filter(local);
 515
 516                netif_carrier_on(dev);
 517                break;
 518        default:
 519                if (coming_up) {
 520                        ieee80211_del_virtual_monitor(local);
 521
 522                        res = drv_add_interface(local, sdata);
 523                        if (res)
 524                                goto err_stop;
 525                        res = ieee80211_check_queues(sdata);
 526                        if (res)
 527                                goto err_del_interface;
 528                }
 529
 530                if (sdata->vif.type == NL80211_IFTYPE_AP) {
 531                        local->fif_pspoll++;
 532                        local->fif_probe_req++;
 533
 534                        ieee80211_configure_filter(local);
 535                } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 536                        local->fif_probe_req++;
 537                }
 538
 539                changed |= ieee80211_reset_erp_info(sdata);
 540                ieee80211_bss_info_change_notify(sdata, changed);
 541
 542                if (sdata->vif.type == NL80211_IFTYPE_STATION ||
 543                    sdata->vif.type == NL80211_IFTYPE_ADHOC ||
 544                    sdata->vif.type == NL80211_IFTYPE_AP)
 545                        netif_carrier_off(dev);
 546                else
 547                        netif_carrier_on(dev);
 548
 549                /*
 550                 * set default queue parameters so drivers don't
 551                 * need to initialise the hardware if the hardware
 552                 * doesn't start up with sane defaults
 553                 */
 554                ieee80211_set_wmm_default(sdata, true);
 555        }
 556
 557        set_bit(SDATA_STATE_RUNNING, &sdata->state);
 558
 559        if (sdata->vif.type == NL80211_IFTYPE_WDS) {
 560                /* Create STA entry for the WDS peer */
 561                sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
 562                                     GFP_KERNEL);
 563                if (!sta) {
 564                        res = -ENOMEM;
 565                        goto err_del_interface;
 566                }
 567
 568                sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
 569                sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
 570                sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
 571
 572                res = sta_info_insert(sta);
 573                if (res) {
 574                        /* STA has been freed */
 575                        goto err_del_interface;
 576                }
 577
 578                rate_control_rate_init(sta);
 579        }
 580
 581        /*
 582         * set_multicast_list will be invoked by the networking core
 583         * which will check whether any increments here were done in
 584         * error and sync them down to the hardware as filter flags.
 585         */
 586        if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 587                atomic_inc(&local->iff_allmultis);
 588
 589        if (sdata->flags & IEEE80211_SDATA_PROMISC)
 590                atomic_inc(&local->iff_promiscs);
 591
 592        mutex_lock(&local->mtx);
 593        hw_reconf_flags |= __ieee80211_recalc_idle(local);
 594        mutex_unlock(&local->mtx);
 595
 596        if (coming_up)
 597                local->open_count++;
 598
 599        if (hw_reconf_flags)
 600                ieee80211_hw_config(local, hw_reconf_flags);
 601
 602        ieee80211_recalc_ps(local, -1);
 603
 604        netif_tx_start_all_queues(dev);
 605
 606        return 0;
 607 err_del_interface:
 608        drv_remove_interface(local, sdata);
 609 err_stop:
 610        if (!local->open_count)
 611                drv_stop(local);
 612 err_del_bss:
 613        sdata->bss = NULL;
 614        if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
 615                list_del(&sdata->u.vlan.list);
 616        /* might already be clear but that doesn't matter */
 617        clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 618        return res;
 619}
 620
 621static int ieee80211_open(struct net_device *dev)
 622{
 623        struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 624        int err;
 625
 626        /* fail early if user set an invalid address */
 627        if (!is_valid_ether_addr(dev->dev_addr))
 628                return -EADDRNOTAVAIL;
 629
 630        err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
 631        if (err)
 632                return err;
 633
 634        return ieee80211_do_open(dev, true);
 635}
 636
 637static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
 638                              bool going_down)
 639{
 640        struct ieee80211_local *local = sdata->local;
 641        unsigned long flags;
 642        struct sk_buff *skb, *tmp;
 643        u32 hw_reconf_flags = 0;
 644        int i;
 645        enum nl80211_channel_type orig_ct;
 646
 647        clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 648
 649        if (rcu_access_pointer(local->scan_sdata) == sdata)
 650                ieee80211_scan_cancel(local);
 651
 652        /*
 653         * Stop TX on this interface first.
 654         */
 655        netif_tx_stop_all_queues(sdata->dev);
 656
 657        ieee80211_roc_purge(sdata);
 658
 659        /*
 660         * Remove all stations associated with this interface.
 661         *
 662         * This must be done before calling ops->remove_interface()
 663         * because otherwise we can later invoke ops->sta_notify()
 664         * whenever the STAs are removed, and that invalidates driver
 665         * assumptions about always getting a vif pointer that is valid
 666         * (because if we remove a STA after ops->remove_interface()
 667         * the driver will have removed the vif info already!)
 668         *
 669         * This is relevant only in AP, WDS and mesh modes, since in
 670         * all other modes we've already removed all stations when
 671         * disconnecting etc.
 672         */
 673        sta_info_flush(local, sdata);
 674
 675        /*
 676         * Don't count this interface for promisc/allmulti while it
 677         * is down. dev_mc_unsync() will invoke set_multicast_list
 678         * on the master interface which will sync these down to the
 679         * hardware as filter flags.
 680         */
 681        if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 682                atomic_dec(&local->iff_allmultis);
 683
 684        if (sdata->flags & IEEE80211_SDATA_PROMISC)
 685                atomic_dec(&local->iff_promiscs);
 686
 687        if (sdata->vif.type == NL80211_IFTYPE_AP) {
 688                local->fif_pspoll--;
 689                local->fif_probe_req--;
 690        } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 691                local->fif_probe_req--;
 692        }
 693
 694        netif_addr_lock_bh(sdata->dev);
 695        spin_lock_bh(&local->filter_lock);
 696        __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
 697                         sdata->dev->addr_len);
 698        spin_unlock_bh(&local->filter_lock);
 699        netif_addr_unlock_bh(sdata->dev);
 700
 701        ieee80211_configure_filter(local);
 702
 703        del_timer_sync(&local->dynamic_ps_timer);
 704        cancel_work_sync(&local->dynamic_ps_enable_work);
 705
 706        /* APs need special treatment */
 707        if (sdata->vif.type == NL80211_IFTYPE_AP) {
 708                struct ieee80211_sub_if_data *vlan, *tmpsdata;
 709                struct beacon_data *old_beacon =
 710                        rtnl_dereference(sdata->u.ap.beacon);
 711                struct sk_buff *old_probe_resp =
 712                        rtnl_dereference(sdata->u.ap.probe_resp);
 713
 714                /* sdata_running will return false, so this will disable */
 715                ieee80211_bss_info_change_notify(sdata,
 716                                                 BSS_CHANGED_BEACON_ENABLED);
 717
 718                /* remove beacon and probe response */
 719                RCU_INIT_POINTER(sdata->u.ap.beacon, NULL);
 720                RCU_INIT_POINTER(sdata->u.ap.probe_resp, NULL);
 721                synchronize_rcu();
 722                kfree(old_beacon);
 723                kfree_skb(old_probe_resp);
 724
 725                /* down all dependent devices, that is VLANs */
 726                list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
 727                                         u.vlan.list)
 728                        dev_close(vlan->dev);
 729                WARN_ON(!list_empty(&sdata->u.ap.vlans));
 730
 731                /* free all potentially still buffered bcast frames */
 732                local->total_ps_buffered -= skb_queue_len(&sdata->u.ap.ps_bc_buf);
 733                skb_queue_purge(&sdata->u.ap.ps_bc_buf);
 734        } else if (sdata->vif.type == NL80211_IFTYPE_STATION) {
 735                ieee80211_mgd_stop(sdata);
 736        }
 737
 738        if (going_down)
 739                local->open_count--;
 740
 741        switch (sdata->vif.type) {
 742        case NL80211_IFTYPE_AP_VLAN:
 743                list_del(&sdata->u.vlan.list);
 744                /* no need to tell driver */
 745                break;
 746        case NL80211_IFTYPE_MONITOR:
 747                if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 748                        local->cooked_mntrs--;
 749                        break;
 750                }
 751
 752                local->monitors--;
 753                if (local->monitors == 0) {
 754                        local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
 755                        hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 756                        ieee80211_del_virtual_monitor(local);
 757                }
 758
 759                ieee80211_adjust_monitor_flags(sdata, -1);
 760                ieee80211_configure_filter(local);
 761                break;
 762        default:
 763                flush_work(&sdata->work);
 764                /*
 765                 * When we get here, the interface is marked down.
 766                 * Call synchronize_rcu() to wait for the RX path
 767                 * should it be using the interface and enqueuing
 768                 * frames at this very time on another CPU.
 769                 */
 770                synchronize_rcu();
 771                skb_queue_purge(&sdata->skb_queue);
 772
 773                /*
 774                 * Disable beaconing here for mesh only, AP and IBSS
 775                 * are already taken care of.
 776                 */
 777                if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
 778                        ieee80211_bss_info_change_notify(sdata,
 779                                BSS_CHANGED_BEACON_ENABLED);
 780
 781                /*
 782                 * Free all remaining keys, there shouldn't be any,
 783                 * except maybe group keys in AP more or WDS?
 784                 */
 785                ieee80211_free_keys(sdata);
 786
 787                if (going_down)
 788                        drv_remove_interface(local, sdata);
 789        }
 790
 791        sdata->bss = NULL;
 792
 793        mutex_lock(&local->mtx);
 794        hw_reconf_flags |= __ieee80211_recalc_idle(local);
 795        mutex_unlock(&local->mtx);
 796
 797        ieee80211_recalc_ps(local, -1);
 798
 799        if (local->open_count == 0) {
 800                if (local->ops->napi_poll)
 801                        napi_disable(&local->napi);
 802                ieee80211_clear_tx_pending(local);
 803                ieee80211_stop_device(local);
 804
 805                /* no reconfiguring after stop! */
 806                hw_reconf_flags = 0;
 807        }
 808
 809        /* Re-calculate channel-type, in case there are multiple vifs
 810         * on different channel types.
 811         */
 812        orig_ct = local->_oper_channel_type;
 813        ieee80211_set_channel_type(local, NULL, NL80211_CHAN_NO_HT);
 814
 815        /* do after stop to avoid reconfiguring when we stop anyway */
 816        if (hw_reconf_flags || (orig_ct != local->_oper_channel_type))
 817                ieee80211_hw_config(local, hw_reconf_flags);
 818
 819        spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 820        for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 821                skb_queue_walk_safe(&local->pending[i], skb, tmp) {
 822                        struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 823                        if (info->control.vif == &sdata->vif) {
 824                                __skb_unlink(skb, &local->pending[i]);
 825                                dev_kfree_skb_irq(skb);
 826                        }
 827                }
 828        }
 829        spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 830
 831        if (local->monitors == local->open_count && local->monitors > 0)
 832                ieee80211_add_virtual_monitor(local);
 833}
 834
 835static int ieee80211_stop(struct net_device *dev)
 836{
 837        struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 838
 839        ieee80211_do_stop(sdata, true);
 840
 841        return 0;
 842}
 843
 844static void ieee80211_set_multicast_list(struct net_device *dev)
 845{
 846        struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 847        struct ieee80211_local *local = sdata->local;
 848        int allmulti, promisc, sdata_allmulti, sdata_promisc;
 849
 850        allmulti = !!(dev->flags & IFF_ALLMULTI);
 851        promisc = !!(dev->flags & IFF_PROMISC);
 852        sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
 853        sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
 854
 855        if (allmulti != sdata_allmulti) {
 856                if (dev->flags & IFF_ALLMULTI)
 857                        atomic_inc(&local->iff_allmultis);
 858                else
 859                        atomic_dec(&local->iff_allmultis);
 860                sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
 861        }
 862
 863        if (promisc != sdata_promisc) {
 864                if (dev->flags & IFF_PROMISC)
 865                        atomic_inc(&local->iff_promiscs);
 866                else
 867                        atomic_dec(&local->iff_promiscs);
 868                sdata->flags ^= IEEE80211_SDATA_PROMISC;
 869        }
 870        spin_lock_bh(&local->filter_lock);
 871        __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
 872        spin_unlock_bh(&local->filter_lock);
 873        ieee80211_queue_work(&local->hw, &local->reconfig_filter);
 874}
 875
 876/*
 877 * Called when the netdev is removed or, by the code below, before
 878 * the interface type changes.
 879 */
 880static void ieee80211_teardown_sdata(struct net_device *dev)
 881{
 882        struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 883        struct ieee80211_local *local = sdata->local;
 884        int flushed;
 885        int i;
 886
 887        /* free extra data */
 888        ieee80211_free_keys(sdata);
 889
 890        ieee80211_debugfs_remove_netdev(sdata);
 891
 892        for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
 893                __skb_queue_purge(&sdata->fragments[i].skb_list);
 894        sdata->fragment_next = 0;
 895
 896        if (ieee80211_vif_is_mesh(&sdata->vif))
 897                mesh_rmc_free(sdata);
 898
 899        flushed = sta_info_flush(local, sdata);
 900        WARN_ON(flushed);
 901}
 902
 903static u16 ieee80211_netdev_select_queue(struct net_device *dev,
 904                                         struct sk_buff *skb)
 905{
 906        return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
 907}
 908
 909static const struct net_device_ops ieee80211_dataif_ops = {
 910        .ndo_open               = ieee80211_open,
 911        .ndo_stop               = ieee80211_stop,
 912        .ndo_uninit             = ieee80211_teardown_sdata,
 913        .ndo_start_xmit         = ieee80211_subif_start_xmit,
 914        .ndo_set_rx_mode        = ieee80211_set_multicast_list,
 915        .ndo_change_mtu         = ieee80211_change_mtu,
 916        .ndo_set_mac_address    = ieee80211_change_mac,
 917        .ndo_select_queue       = ieee80211_netdev_select_queue,
 918};
 919
 920static u16 ieee80211_monitor_select_queue(struct net_device *dev,
 921                                          struct sk_buff *skb)
 922{
 923        struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 924        struct ieee80211_local *local = sdata->local;
 925        struct ieee80211_hdr *hdr;
 926        struct ieee80211_radiotap_header *rtap = (void *)skb->data;
 927
 928        if (local->hw.queues < IEEE80211_NUM_ACS)
 929                return 0;
 930
 931        if (skb->len < 4 ||
 932            skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
 933                return 0; /* doesn't matter, frame will be dropped */
 934
 935        hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
 936
 937        return ieee80211_select_queue_80211(sdata, skb, hdr);
 938}
 939
 940static const struct net_device_ops ieee80211_monitorif_ops = {
 941        .ndo_open               = ieee80211_open,
 942        .ndo_stop               = ieee80211_stop,
 943        .ndo_uninit             = ieee80211_teardown_sdata,
 944        .ndo_start_xmit         = ieee80211_monitor_start_xmit,
 945        .ndo_set_rx_mode        = ieee80211_set_multicast_list,
 946        .ndo_change_mtu         = ieee80211_change_mtu,
 947        .ndo_set_mac_address    = eth_mac_addr,
 948        .ndo_select_queue       = ieee80211_monitor_select_queue,
 949};
 950
 951static void ieee80211_if_setup(struct net_device *dev)
 952{
 953        ether_setup(dev);
 954        dev->priv_flags &= ~IFF_TX_SKB_SHARING;
 955        dev->netdev_ops = &ieee80211_dataif_ops;
 956        dev->destructor = free_netdev;
 957}
 958
 959static void ieee80211_iface_work(struct work_struct *work)
 960{
 961        struct ieee80211_sub_if_data *sdata =
 962                container_of(work, struct ieee80211_sub_if_data, work);
 963        struct ieee80211_local *local = sdata->local;
 964        struct sk_buff *skb;
 965        struct sta_info *sta;
 966        struct ieee80211_ra_tid *ra_tid;
 967
 968        if (!ieee80211_sdata_running(sdata))
 969                return;
 970
 971        if (local->scanning)
 972                return;
 973
 974        /*
 975         * ieee80211_queue_work() should have picked up most cases,
 976         * here we'll pick the rest.
 977         */
 978        if (WARN(local->suspended,
 979                 "interface work scheduled while going to suspend\n"))
 980                return;
 981
 982        /* first process frames */
 983        while ((skb = skb_dequeue(&sdata->skb_queue))) {
 984                struct ieee80211_mgmt *mgmt = (void *)skb->data;
 985
 986                if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
 987                        ra_tid = (void *)&skb->cb;
 988                        ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
 989                                                 ra_tid->tid);
 990                } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
 991                        ra_tid = (void *)&skb->cb;
 992                        ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
 993                                                ra_tid->tid);
 994                } else if (ieee80211_is_action(mgmt->frame_control) &&
 995                           mgmt->u.action.category == WLAN_CATEGORY_BACK) {
 996                        int len = skb->len;
 997
 998                        mutex_lock(&local->sta_mtx);
 999                        sta = sta_info_get_bss(sdata, mgmt->sa);
1000                        if (sta) {
1001                                switch (mgmt->u.action.u.addba_req.action_code) {
1002                                case WLAN_ACTION_ADDBA_REQ:
1003                                        ieee80211_process_addba_request(
1004                                                        local, sta, mgmt, len);
1005                                        break;
1006                                case WLAN_ACTION_ADDBA_RESP:
1007                                        ieee80211_process_addba_resp(local, sta,
1008                                                                     mgmt, len);
1009                                        break;
1010                                case WLAN_ACTION_DELBA:
1011                                        ieee80211_process_delba(sdata, sta,
1012                                                                mgmt, len);
1013                                        break;
1014                                default:
1015                                        WARN_ON(1);
1016                                        break;
1017                                }
1018                        }
1019                        mutex_unlock(&local->sta_mtx);
1020                } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1021                        struct ieee80211_hdr *hdr = (void *)mgmt;
1022                        /*
1023                         * So the frame isn't mgmt, but frame_control
1024                         * is at the right place anyway, of course, so
1025                         * the if statement is correct.
1026                         *
1027                         * Warn if we have other data frame types here,
1028                         * they must not get here.
1029                         */
1030                        WARN_ON(hdr->frame_control &
1031                                        cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1032                        WARN_ON(!(hdr->seq_ctrl &
1033                                        cpu_to_le16(IEEE80211_SCTL_FRAG)));
1034                        /*
1035                         * This was a fragment of a frame, received while
1036                         * a block-ack session was active. That cannot be
1037                         * right, so terminate the session.
1038                         */
1039                        mutex_lock(&local->sta_mtx);
1040                        sta = sta_info_get_bss(sdata, mgmt->sa);
1041                        if (sta) {
1042                                u16 tid = *ieee80211_get_qos_ctl(hdr) &
1043                                                IEEE80211_QOS_CTL_TID_MASK;
1044
1045                                __ieee80211_stop_rx_ba_session(
1046                                        sta, tid, WLAN_BACK_RECIPIENT,
1047                                        WLAN_REASON_QSTA_REQUIRE_SETUP,
1048                                        true);
1049                        }
1050                        mutex_unlock(&local->sta_mtx);
1051                } else switch (sdata->vif.type) {
1052                case NL80211_IFTYPE_STATION:
1053                        ieee80211_sta_rx_queued_mgmt(sdata, skb);
1054                        break;
1055                case NL80211_IFTYPE_ADHOC:
1056                        ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1057                        break;
1058                case NL80211_IFTYPE_MESH_POINT:
1059                        if (!ieee80211_vif_is_mesh(&sdata->vif))
1060                                break;
1061                        ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1062                        break;
1063                default:
1064                        WARN(1, "frame for unexpected interface type");
1065                        break;
1066                }
1067
1068                kfree_skb(skb);
1069        }
1070
1071        /* then other type-dependent work */
1072        switch (sdata->vif.type) {
1073        case NL80211_IFTYPE_STATION:
1074                ieee80211_sta_work(sdata);
1075                break;
1076        case NL80211_IFTYPE_ADHOC:
1077                ieee80211_ibss_work(sdata);
1078                break;
1079        case NL80211_IFTYPE_MESH_POINT:
1080                if (!ieee80211_vif_is_mesh(&sdata->vif))
1081                        break;
1082                ieee80211_mesh_work(sdata);
1083                break;
1084        default:
1085                break;
1086        }
1087}
1088
1089
1090/*
1091 * Helper function to initialise an interface to a specific type.
1092 */
1093static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1094                                  enum nl80211_iftype type)
1095{
1096        /* clear type-dependent union */
1097        memset(&sdata->u, 0, sizeof(sdata->u));
1098
1099        /* and set some type-dependent values */
1100        sdata->vif.type = type;
1101        sdata->vif.p2p = false;
1102        sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1103        sdata->wdev.iftype = type;
1104
1105        sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1106        sdata->control_port_no_encrypt = false;
1107
1108        sdata->noack_map = 0;
1109
1110        /* only monitor differs */
1111        sdata->dev->type = ARPHRD_ETHER;
1112
1113        skb_queue_head_init(&sdata->skb_queue);
1114        INIT_WORK(&sdata->work, ieee80211_iface_work);
1115
1116        switch (type) {
1117        case NL80211_IFTYPE_P2P_GO:
1118                type = NL80211_IFTYPE_AP;
1119                sdata->vif.type = type;
1120                sdata->vif.p2p = true;
1121                /* fall through */
1122        case NL80211_IFTYPE_AP:
1123                skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
1124                INIT_LIST_HEAD(&sdata->u.ap.vlans);
1125                break;
1126        case NL80211_IFTYPE_P2P_CLIENT:
1127                type = NL80211_IFTYPE_STATION;
1128                sdata->vif.type = type;
1129                sdata->vif.p2p = true;
1130                /* fall through */
1131        case NL80211_IFTYPE_STATION:
1132                ieee80211_sta_setup_sdata(sdata);
1133                break;
1134        case NL80211_IFTYPE_ADHOC:
1135                ieee80211_ibss_setup_sdata(sdata);
1136                break;
1137        case NL80211_IFTYPE_MESH_POINT:
1138                if (ieee80211_vif_is_mesh(&sdata->vif))
1139                        ieee80211_mesh_init_sdata(sdata);
1140                break;
1141        case NL80211_IFTYPE_MONITOR:
1142                sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1143                sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1144                sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
1145                                      MONITOR_FLAG_OTHER_BSS;
1146                break;
1147        case NL80211_IFTYPE_WDS:
1148        case NL80211_IFTYPE_AP_VLAN:
1149                break;
1150        case NL80211_IFTYPE_UNSPECIFIED:
1151        case NUM_NL80211_IFTYPES:
1152                BUG();
1153                break;
1154        }
1155
1156        ieee80211_debugfs_add_netdev(sdata);
1157}
1158
1159static void ieee80211_clean_sdata(struct ieee80211_sub_if_data *sdata)
1160{
1161        switch (sdata->vif.type) {
1162        case NL80211_IFTYPE_MESH_POINT:
1163                mesh_path_flush_by_iface(sdata);
1164                break;
1165
1166        default:
1167                break;
1168        }
1169}
1170
1171static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1172                                           enum nl80211_iftype type)
1173{
1174        struct ieee80211_local *local = sdata->local;
1175        int ret, err;
1176        enum nl80211_iftype internal_type = type;
1177        bool p2p = false;
1178
1179        ASSERT_RTNL();
1180
1181        if (!local->ops->change_interface)
1182                return -EBUSY;
1183
1184        switch (sdata->vif.type) {
1185        case NL80211_IFTYPE_AP:
1186        case NL80211_IFTYPE_STATION:
1187        case NL80211_IFTYPE_ADHOC:
1188                /*
1189                 * Could maybe also all others here?
1190                 * Just not sure how that interacts
1191                 * with the RX/config path e.g. for
1192                 * mesh.
1193                 */
1194                break;
1195        default:
1196                return -EBUSY;
1197        }
1198
1199        switch (type) {
1200        case NL80211_IFTYPE_AP:
1201        case NL80211_IFTYPE_STATION:
1202        case NL80211_IFTYPE_ADHOC:
1203                /*
1204                 * Could probably support everything
1205                 * but WDS here (WDS do_open can fail
1206                 * under memory pressure, which this
1207                 * code isn't prepared to handle).
1208                 */
1209                break;
1210        case NL80211_IFTYPE_P2P_CLIENT:
1211                p2p = true;
1212                internal_type = NL80211_IFTYPE_STATION;
1213                break;
1214        case NL80211_IFTYPE_P2P_GO:
1215                p2p = true;
1216                internal_type = NL80211_IFTYPE_AP;
1217                break;
1218        default:
1219                return -EBUSY;
1220        }
1221
1222        ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1223        if (ret)
1224                return ret;
1225
1226        ieee80211_do_stop(sdata, false);
1227
1228        ieee80211_teardown_sdata(sdata->dev);
1229
1230        ret = drv_change_interface(local, sdata, internal_type, p2p);
1231        if (ret)
1232                type = sdata->vif.type;
1233
1234        /*
1235         * Ignore return value here, there's not much we can do since
1236         * the driver changed the interface type internally already.
1237         * The warnings will hopefully make driver authors fix it :-)
1238         */
1239        ieee80211_check_queues(sdata);
1240
1241        ieee80211_setup_sdata(sdata, type);
1242
1243        err = ieee80211_do_open(sdata->dev, false);
1244        WARN(err, "type change: do_open returned %d", err);
1245
1246        return ret;
1247}
1248
1249int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1250                             enum nl80211_iftype type)
1251{
1252        int ret;
1253
1254        ASSERT_RTNL();
1255
1256        if (type == ieee80211_vif_type_p2p(&sdata->vif))
1257                return 0;
1258
1259        /* Setting ad-hoc mode on non-IBSS channel is not supported. */
1260        if (sdata->local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS &&
1261            type == NL80211_IFTYPE_ADHOC)
1262                return -EOPNOTSUPP;
1263
1264        if (ieee80211_sdata_running(sdata)) {
1265                ret = ieee80211_runtime_change_iftype(sdata, type);
1266                if (ret)
1267                        return ret;
1268        } else {
1269                /* Purge and reset type-dependent state. */
1270                ieee80211_teardown_sdata(sdata->dev);
1271                ieee80211_setup_sdata(sdata, type);
1272        }
1273
1274        /* reset some values that shouldn't be kept across type changes */
1275        sdata->vif.bss_conf.basic_rates =
1276                ieee80211_mandatory_rates(sdata->local,
1277                        sdata->local->hw.conf.channel->band);
1278        sdata->drop_unencrypted = 0;
1279        if (type == NL80211_IFTYPE_STATION)
1280                sdata->u.mgd.use_4addr = false;
1281
1282        return 0;
1283}
1284
1285static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1286                                       struct net_device *dev,
1287                                       enum nl80211_iftype type)
1288{
1289        struct ieee80211_sub_if_data *sdata;
1290        u64 mask, start, addr, val, inc;
1291        u8 *m;
1292        u8 tmp_addr[ETH_ALEN];
1293        int i;
1294
1295        /* default ... something at least */
1296        memcpy(dev->perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1297
1298        if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1299            local->hw.wiphy->n_addresses <= 1)
1300                return;
1301
1302
1303        mutex_lock(&local->iflist_mtx);
1304
1305        switch (type) {
1306        case NL80211_IFTYPE_MONITOR:
1307                /* doesn't matter */
1308                break;
1309        case NL80211_IFTYPE_WDS:
1310        case NL80211_IFTYPE_AP_VLAN:
1311                /* match up with an AP interface */
1312                list_for_each_entry(sdata, &local->interfaces, list) {
1313                        if (sdata->vif.type != NL80211_IFTYPE_AP)
1314                                continue;
1315                        memcpy(dev->perm_addr, sdata->vif.addr, ETH_ALEN);
1316                        break;
1317                }
1318                /* keep default if no AP interface present */
1319                break;
1320        default:
1321                /* assign a new address if possible -- try n_addresses first */
1322                for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1323                        bool used = false;
1324
1325                        list_for_each_entry(sdata, &local->interfaces, list) {
1326                                if (memcmp(local->hw.wiphy->addresses[i].addr,
1327                                           sdata->vif.addr, ETH_ALEN) == 0) {
1328                                        used = true;
1329                                        break;
1330                                }
1331                        }
1332
1333                        if (!used) {
1334                                memcpy(dev->perm_addr,
1335                                       local->hw.wiphy->addresses[i].addr,
1336                                       ETH_ALEN);
1337                                break;
1338                        }
1339                }
1340
1341                /* try mask if available */
1342                if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1343                        break;
1344
1345                m = local->hw.wiphy->addr_mask;
1346                mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1347                        ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1348                        ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1349
1350                if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1351                        /* not a contiguous mask ... not handled now! */
1352                        pr_info("not contiguous\n");
1353                        break;
1354                }
1355
1356                m = local->hw.wiphy->perm_addr;
1357                start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1358                        ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1359                        ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1360
1361                inc = 1ULL<<__ffs64(mask);
1362                val = (start & mask);
1363                addr = (start & ~mask) | (val & mask);
1364                do {
1365                        bool used = false;
1366
1367                        tmp_addr[5] = addr >> 0*8;
1368                        tmp_addr[4] = addr >> 1*8;
1369                        tmp_addr[3] = addr >> 2*8;
1370                        tmp_addr[2] = addr >> 3*8;
1371                        tmp_addr[1] = addr >> 4*8;
1372                        tmp_addr[0] = addr >> 5*8;
1373
1374                        val += inc;
1375
1376                        list_for_each_entry(sdata, &local->interfaces, list) {
1377                                if (memcmp(tmp_addr, sdata->vif.addr,
1378                                                        ETH_ALEN) == 0) {
1379                                        used = true;
1380                                        break;
1381                                }
1382                        }
1383
1384                        if (!used) {
1385                                memcpy(dev->perm_addr, tmp_addr, ETH_ALEN);
1386                                break;
1387                        }
1388                        addr = (start & ~mask) | (val & mask);
1389                } while (addr != start);
1390
1391                break;
1392        }
1393
1394        mutex_unlock(&local->iflist_mtx);
1395}
1396
1397int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1398                     struct wireless_dev **new_wdev, enum nl80211_iftype type,
1399                     struct vif_params *params)
1400{
1401        struct net_device *ndev;
1402        struct ieee80211_sub_if_data *sdata = NULL;
1403        int ret, i;
1404        int txqs = 1;
1405
1406        ASSERT_RTNL();
1407
1408        if (local->hw.queues >= IEEE80211_NUM_ACS)
1409                txqs = IEEE80211_NUM_ACS;
1410
1411        ndev = alloc_netdev_mqs(sizeof(*sdata) + local->hw.vif_data_size,
1412                                name, ieee80211_if_setup, txqs, 1);
1413        if (!ndev)
1414                return -ENOMEM;
1415        dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1416
1417        ndev->needed_headroom = local->tx_headroom +
1418                                4*6 /* four MAC addresses */
1419                                + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1420                                + 6 /* mesh */
1421                                + 8 /* rfc1042/bridge tunnel */
1422                                - ETH_HLEN /* ethernet hard_header_len */
1423                                + IEEE80211_ENCRYPT_HEADROOM;
1424        ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1425
1426        ret = dev_alloc_name(ndev, ndev->name);
1427        if (ret < 0)
1428                goto fail;
1429
1430        ieee80211_assign_perm_addr(local, ndev, type);
1431        memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1432        SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1433
1434        /* don't use IEEE80211_DEV_TO_SUB_IF because it checks too much */
1435        sdata = netdev_priv(ndev);
1436        ndev->ieee80211_ptr = &sdata->wdev;
1437        memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1438        memcpy(sdata->name, ndev->name, IFNAMSIZ);
1439
1440        /* initialise type-independent data */
1441        sdata->wdev.wiphy = local->hw.wiphy;
1442        sdata->local = local;
1443        sdata->dev = ndev;
1444#ifdef CONFIG_INET
1445        sdata->arp_filter_state = true;
1446#endif
1447
1448        for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1449                skb_queue_head_init(&sdata->fragments[i].skb_list);
1450
1451        INIT_LIST_HEAD(&sdata->key_list);
1452
1453        for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1454                struct ieee80211_supported_band *sband;
1455                sband = local->hw.wiphy->bands[i];
1456                sdata->rc_rateidx_mask[i] =
1457                        sband ? (1 << sband->n_bitrates) - 1 : 0;
1458                if (sband)
1459                        memcpy(sdata->rc_rateidx_mcs_mask[i],
1460                               sband->ht_cap.mcs.rx_mask,
1461                               sizeof(sdata->rc_rateidx_mcs_mask[i]));
1462                else
1463                        memset(sdata->rc_rateidx_mcs_mask[i], 0,
1464                               sizeof(sdata->rc_rateidx_mcs_mask[i]));
1465        }
1466
1467        ieee80211_set_default_queues(sdata);
1468
1469        /* setup type-dependent data */
1470        ieee80211_setup_sdata(sdata, type);
1471
1472        if (params) {
1473                ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1474                if (type == NL80211_IFTYPE_STATION)
1475                        sdata->u.mgd.use_4addr = params->use_4addr;
1476        }
1477
1478        ndev->features |= local->hw.netdev_features;
1479
1480        ret = register_netdevice(ndev);
1481        if (ret)
1482                goto fail;
1483
1484        mutex_lock(&local->iflist_mtx);
1485        list_add_tail_rcu(&sdata->list, &local->interfaces);
1486        mutex_unlock(&local->iflist_mtx);
1487
1488        if (new_wdev)
1489                *new_wdev = &sdata->wdev;
1490
1491        return 0;
1492
1493 fail:
1494        free_netdev(ndev);
1495        return ret;
1496}
1497
1498void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1499{
1500        ASSERT_RTNL();
1501
1502        mutex_lock(&sdata->local->iflist_mtx);
1503        list_del_rcu(&sdata->list);
1504        mutex_unlock(&sdata->local->iflist_mtx);
1505
1506        /* clean up type-dependent data */
1507        ieee80211_clean_sdata(sdata);
1508
1509        synchronize_rcu();
1510        unregister_netdevice(sdata->dev);
1511}
1512
1513/*
1514 * Remove all interfaces, may only be called at hardware unregistration
1515 * time because it doesn't do RCU-safe list removals.
1516 */
1517void ieee80211_remove_interfaces(struct ieee80211_local *local)
1518{
1519        struct ieee80211_sub_if_data *sdata, *tmp;
1520        LIST_HEAD(unreg_list);
1521
1522        ASSERT_RTNL();
1523
1524        mutex_lock(&local->iflist_mtx);
1525        list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1526                list_del(&sdata->list);
1527
1528                ieee80211_clean_sdata(sdata);
1529
1530                unregister_netdevice_queue(sdata->dev, &unreg_list);
1531        }
1532        mutex_unlock(&local->iflist_mtx);
1533        unregister_netdevice_many(&unreg_list);
1534        list_del(&unreg_list);
1535}
1536
1537static int netdev_notify(struct notifier_block *nb,
1538                         unsigned long state,
1539                         void *ndev)
1540{
1541        struct net_device *dev = ndev;
1542        struct ieee80211_sub_if_data *sdata;
1543
1544        if (state != NETDEV_CHANGENAME)
1545                return 0;
1546
1547        if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1548                return 0;
1549
1550        if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1551                return 0;
1552
1553        sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1554
1555        memcpy(sdata->name, dev->name, IFNAMSIZ);
1556
1557        ieee80211_debugfs_rename_netdev(sdata);
1558        return 0;
1559}
1560
1561static struct notifier_block mac80211_netdev_notifier = {
1562        .notifier_call = netdev_notify,
1563};
1564
1565int ieee80211_iface_init(void)
1566{
1567        return register_netdevice_notifier(&mac80211_netdev_notifier);
1568}
1569
1570void ieee80211_iface_exit(void)
1571{
1572        unregister_netdevice_notifier(&mac80211_netdev_notifier);
1573}
1574
lxr.linux.no kindly hosted by Redpill Linpro AS, provider of Linux consulting and operations services since 1995.