linux/net/mac80211/ibss.c
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   1/*
   2 * IBSS mode implementation
   3 * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
   4 * Copyright 2004, Instant802 Networks, Inc.
   5 * Copyright 2005, Devicescape Software, Inc.
   6 * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   7 * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
   8 * Copyright 2009, Johannes Berg <johannes@sipsolutions.net>
   9 *
  10 * This program is free software; you can redistribute it and/or modify
  11 * it under the terms of the GNU General Public License version 2 as
  12 * published by the Free Software Foundation.
  13 */
  14
  15#include <linux/delay.h>
  16#include <linux/slab.h>
  17#include <linux/if_ether.h>
  18#include <linux/skbuff.h>
  19#include <linux/if_arp.h>
  20#include <linux/etherdevice.h>
  21#include <linux/rtnetlink.h>
  22#include <net/mac80211.h>
  23
  24#include "ieee80211_i.h"
  25#include "driver-ops.h"
  26#include "rate.h"
  27
  28#define IEEE80211_SCAN_INTERVAL (2 * HZ)
  29#define IEEE80211_SCAN_INTERVAL_SLOW (15 * HZ)
  30#define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ)
  31
  32#define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ)
  33#define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ)
  34
  35#define IEEE80211_IBSS_MAX_STA_ENTRIES 128
  36
  37
  38static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
  39                                      const u8 *bssid, const int beacon_int,
  40                                      struct ieee80211_channel *chan,
  41                                      const u32 basic_rates,
  42                                      const u16 capability, u64 tsf)
  43{
  44        struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
  45        struct ieee80211_local *local = sdata->local;
  46        int rates, i;
  47        struct sk_buff *skb;
  48        struct ieee80211_mgmt *mgmt;
  49        u8 *pos;
  50        struct ieee80211_supported_band *sband;
  51        struct cfg80211_bss *bss;
  52        u32 bss_change;
  53        u8 supp_rates[IEEE80211_MAX_SUPP_RATES];
  54        enum nl80211_channel_type channel_type;
  55
  56        lockdep_assert_held(&ifibss->mtx);
  57
  58        /* Reset own TSF to allow time synchronization work. */
  59        drv_reset_tsf(local, sdata);
  60
  61        skb = ifibss->skb;
  62        RCU_INIT_POINTER(ifibss->presp, NULL);
  63        synchronize_rcu();
  64        skb->data = skb->head;
  65        skb->len = 0;
  66        skb_reset_tail_pointer(skb);
  67        skb_reserve(skb, sdata->local->hw.extra_tx_headroom);
  68
  69        if (!ether_addr_equal(ifibss->bssid, bssid))
  70                sta_info_flush(sdata->local, sdata);
  71
  72        /* if merging, indicate to driver that we leave the old IBSS */
  73        if (sdata->vif.bss_conf.ibss_joined) {
  74                sdata->vif.bss_conf.ibss_joined = false;
  75                netif_carrier_off(sdata->dev);
  76                ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_IBSS);
  77        }
  78
  79        memcpy(ifibss->bssid, bssid, ETH_ALEN);
  80
  81        sdata->drop_unencrypted = capability & WLAN_CAPABILITY_PRIVACY ? 1 : 0;
  82
  83        local->oper_channel = chan;
  84        channel_type = ifibss->channel_type;
  85        if (!cfg80211_can_beacon_sec_chan(local->hw.wiphy, chan, channel_type))
  86                channel_type = NL80211_CHAN_HT20;
  87        if (!ieee80211_set_channel_type(local, sdata, channel_type)) {
  88                /* can only fail due to HT40+/- mismatch */
  89                channel_type = NL80211_CHAN_HT20;
  90                WARN_ON(!ieee80211_set_channel_type(local, sdata,
  91                                                    NL80211_CHAN_HT20));
  92        }
  93        ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
  94
  95        sband = local->hw.wiphy->bands[chan->band];
  96
  97        /* build supported rates array */
  98        pos = supp_rates;
  99        for (i = 0; i < sband->n_bitrates; i++) {
 100                int rate = sband->bitrates[i].bitrate;
 101                u8 basic = 0;
 102                if (basic_rates & BIT(i))
 103                        basic = 0x80;
 104                *pos++ = basic | (u8) (rate / 5);
 105        }
 106
 107        /* Build IBSS probe response */
 108        mgmt = (void *) skb_put(skb, 24 + sizeof(mgmt->u.beacon));
 109        memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
 110        mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 111                                          IEEE80211_STYPE_PROBE_RESP);
 112        eth_broadcast_addr(mgmt->da);
 113        memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 114        memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN);
 115        mgmt->u.beacon.beacon_int = cpu_to_le16(beacon_int);
 116        mgmt->u.beacon.timestamp = cpu_to_le64(tsf);
 117        mgmt->u.beacon.capab_info = cpu_to_le16(capability);
 118
 119        pos = skb_put(skb, 2 + ifibss->ssid_len);
 120        *pos++ = WLAN_EID_SSID;
 121        *pos++ = ifibss->ssid_len;
 122        memcpy(pos, ifibss->ssid, ifibss->ssid_len);
 123
 124        rates = sband->n_bitrates;
 125        if (rates > 8)
 126                rates = 8;
 127        pos = skb_put(skb, 2 + rates);
 128        *pos++ = WLAN_EID_SUPP_RATES;
 129        *pos++ = rates;
 130        memcpy(pos, supp_rates, rates);
 131
 132        if (sband->band == IEEE80211_BAND_2GHZ) {
 133                pos = skb_put(skb, 2 + 1);
 134                *pos++ = WLAN_EID_DS_PARAMS;
 135                *pos++ = 1;
 136                *pos++ = ieee80211_frequency_to_channel(chan->center_freq);
 137        }
 138
 139        pos = skb_put(skb, 2 + 2);
 140        *pos++ = WLAN_EID_IBSS_PARAMS;
 141        *pos++ = 2;
 142        /* FIX: set ATIM window based on scan results */
 143        *pos++ = 0;
 144        *pos++ = 0;
 145
 146        if (sband->n_bitrates > 8) {
 147                rates = sband->n_bitrates - 8;
 148                pos = skb_put(skb, 2 + rates);
 149                *pos++ = WLAN_EID_EXT_SUPP_RATES;
 150                *pos++ = rates;
 151                memcpy(pos, &supp_rates[8], rates);
 152        }
 153
 154        if (ifibss->ie_len)
 155                memcpy(skb_put(skb, ifibss->ie_len),
 156                       ifibss->ie, ifibss->ie_len);
 157
 158        /* add HT capability and information IEs */
 159        if (channel_type && sband->ht_cap.ht_supported) {
 160                pos = skb_put(skb, 4 +
 161                                   sizeof(struct ieee80211_ht_cap) +
 162                                   sizeof(struct ieee80211_ht_operation));
 163                pos = ieee80211_ie_build_ht_cap(pos, &sband->ht_cap,
 164                                                sband->ht_cap.cap);
 165                /*
 166                 * Note: According to 802.11n-2009 9.13.3.1, HT Protection
 167                 * field and RIFS Mode are reserved in IBSS mode, therefore
 168                 * keep them at 0
 169                 */
 170                pos = ieee80211_ie_build_ht_oper(pos, &sband->ht_cap,
 171                                                 chan, channel_type, 0);
 172        }
 173
 174        if (local->hw.queues >= IEEE80211_NUM_ACS) {
 175                pos = skb_put(skb, 9);
 176                *pos++ = WLAN_EID_VENDOR_SPECIFIC;
 177                *pos++ = 7; /* len */
 178                *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
 179                *pos++ = 0x50;
 180                *pos++ = 0xf2;
 181                *pos++ = 2; /* WME */
 182                *pos++ = 0; /* WME info */
 183                *pos++ = 1; /* WME ver */
 184                *pos++ = 0; /* U-APSD no in use */
 185        }
 186
 187        rcu_assign_pointer(ifibss->presp, skb);
 188
 189        sdata->vif.bss_conf.beacon_int = beacon_int;
 190        sdata->vif.bss_conf.basic_rates = basic_rates;
 191        bss_change = BSS_CHANGED_BEACON_INT;
 192        bss_change |= ieee80211_reset_erp_info(sdata);
 193        bss_change |= BSS_CHANGED_BSSID;
 194        bss_change |= BSS_CHANGED_BEACON;
 195        bss_change |= BSS_CHANGED_BEACON_ENABLED;
 196        bss_change |= BSS_CHANGED_BASIC_RATES;
 197        bss_change |= BSS_CHANGED_HT;
 198        bss_change |= BSS_CHANGED_IBSS;
 199        sdata->vif.bss_conf.ibss_joined = true;
 200        ieee80211_bss_info_change_notify(sdata, bss_change);
 201
 202        ieee80211_sta_def_wmm_params(sdata, sband->n_bitrates, supp_rates);
 203
 204        ifibss->state = IEEE80211_IBSS_MLME_JOINED;
 205        mod_timer(&ifibss->timer,
 206                  round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
 207
 208        bss = cfg80211_inform_bss_frame(local->hw.wiphy, chan,
 209                                        mgmt, skb->len, 0, GFP_KERNEL);
 210        cfg80211_put_bss(bss);
 211        netif_carrier_on(sdata->dev);
 212        cfg80211_ibss_joined(sdata->dev, ifibss->bssid, GFP_KERNEL);
 213}
 214
 215static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
 216                                    struct ieee80211_bss *bss)
 217{
 218        struct cfg80211_bss *cbss =
 219                container_of((void *)bss, struct cfg80211_bss, priv);
 220        struct ieee80211_supported_band *sband;
 221        u32 basic_rates;
 222        int i, j;
 223        u16 beacon_int = cbss->beacon_interval;
 224
 225        lockdep_assert_held(&sdata->u.ibss.mtx);
 226
 227        if (beacon_int < 10)
 228                beacon_int = 10;
 229
 230        sband = sdata->local->hw.wiphy->bands[cbss->channel->band];
 231
 232        basic_rates = 0;
 233
 234        for (i = 0; i < bss->supp_rates_len; i++) {
 235                int rate = (bss->supp_rates[i] & 0x7f) * 5;
 236                bool is_basic = !!(bss->supp_rates[i] & 0x80);
 237
 238                for (j = 0; j < sband->n_bitrates; j++) {
 239                        if (sband->bitrates[j].bitrate == rate) {
 240                                if (is_basic)
 241                                        basic_rates |= BIT(j);
 242                                break;
 243                        }
 244                }
 245        }
 246
 247        __ieee80211_sta_join_ibss(sdata, cbss->bssid,
 248                                  beacon_int,
 249                                  cbss->channel,
 250                                  basic_rates,
 251                                  cbss->capability,
 252                                  cbss->tsf);
 253}
 254
 255static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta,
 256                                                  bool auth)
 257        __acquires(RCU)
 258{
 259        struct ieee80211_sub_if_data *sdata = sta->sdata;
 260        u8 addr[ETH_ALEN];
 261
 262        memcpy(addr, sta->sta.addr, ETH_ALEN);
 263
 264        ibss_dbg(sdata, "Adding new IBSS station %pM\n", addr);
 265
 266        sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
 267        sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
 268        /* authorize the station only if the network is not RSN protected. If
 269         * not wait for the userspace to authorize it */
 270        if (!sta->sdata->u.ibss.control_port)
 271                sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
 272
 273        rate_control_rate_init(sta);
 274
 275        /* If it fails, maybe we raced another insertion? */
 276        if (sta_info_insert_rcu(sta))
 277                return sta_info_get(sdata, addr);
 278        if (auth && !sdata->u.ibss.auth_frame_registrations) {
 279                ibss_dbg(sdata,
 280                         "TX Auth SA=%pM DA=%pM BSSID=%pM (auth_transaction=1)\n",
 281                         sdata->vif.addr, addr, sdata->u.ibss.bssid);
 282                ieee80211_send_auth(sdata, 1, WLAN_AUTH_OPEN, NULL, 0,
 283                                    addr, sdata->u.ibss.bssid, NULL, 0, 0);
 284        }
 285        return sta;
 286}
 287
 288static struct sta_info *
 289ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata,
 290                       const u8 *bssid, const u8 *addr,
 291                       u32 supp_rates, bool auth)
 292        __acquires(RCU)
 293{
 294        struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 295        struct ieee80211_local *local = sdata->local;
 296        struct sta_info *sta;
 297        int band = local->oper_channel->band;
 298
 299        /*
 300         * XXX: Consider removing the least recently used entry and
 301         *      allow new one to be added.
 302         */
 303        if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
 304                net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
 305                                    sdata->name, addr);
 306                rcu_read_lock();
 307                return NULL;
 308        }
 309
 310        if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) {
 311                rcu_read_lock();
 312                return NULL;
 313        }
 314
 315        if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) {
 316                rcu_read_lock();
 317                return NULL;
 318        }
 319
 320        sta = sta_info_alloc(sdata, addr, GFP_KERNEL);
 321        if (!sta) {
 322                rcu_read_lock();
 323                return NULL;
 324        }
 325
 326        sta->last_rx = jiffies;
 327
 328        /* make sure mandatory rates are always added */
 329        sta->sta.supp_rates[band] = supp_rates |
 330                        ieee80211_mandatory_rates(local, band);
 331
 332        return ieee80211_ibss_finish_sta(sta, auth);
 333}
 334
 335static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data *sdata,
 336                                          struct ieee80211_mgmt *mgmt,
 337                                          size_t len)
 338{
 339        u16 reason = le16_to_cpu(mgmt->u.deauth.reason_code);
 340
 341        if (len < IEEE80211_DEAUTH_FRAME_LEN)
 342                return;
 343
 344        ibss_dbg(sdata, "RX DeAuth SA=%pM DA=%pM BSSID=%pM (reason: %d)\n",
 345                 mgmt->sa, mgmt->da, mgmt->bssid, reason);
 346        sta_info_destroy_addr(sdata, mgmt->sa);
 347}
 348
 349static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata,
 350                                        struct ieee80211_mgmt *mgmt,
 351                                        size_t len)
 352{
 353        u16 auth_alg, auth_transaction;
 354        struct sta_info *sta;
 355        u8 deauth_frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
 356
 357        lockdep_assert_held(&sdata->u.ibss.mtx);
 358
 359        if (len < 24 + 6)
 360                return;
 361
 362        auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
 363        auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
 364
 365        if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
 366                return;
 367        ibss_dbg(sdata,
 368                 "RX Auth SA=%pM DA=%pM BSSID=%pM (auth_transaction=%d)\n",
 369                 mgmt->sa, mgmt->da, mgmt->bssid, auth_transaction);
 370        sta_info_destroy_addr(sdata, mgmt->sa);
 371        sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, 0, false);
 372        rcu_read_unlock();
 373
 374        /*
 375         * if we have any problem in allocating the new station, we reply with a
 376         * DEAUTH frame to tell the other end that we had a problem
 377         */
 378        if (!sta) {
 379                ieee80211_send_deauth_disassoc(sdata, sdata->u.ibss.bssid,
 380                                               IEEE80211_STYPE_DEAUTH,
 381                                               WLAN_REASON_UNSPECIFIED, true,
 382                                               deauth_frame_buf);
 383                return;
 384        }
 385
 386        /*
 387         * IEEE 802.11 standard does not require authentication in IBSS
 388         * networks and most implementations do not seem to use it.
 389         * However, try to reply to authentication attempts if someone
 390         * has actually implemented this.
 391         */
 392        ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, NULL, 0,
 393                            mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0);
 394}
 395
 396static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
 397                                  struct ieee80211_mgmt *mgmt,
 398                                  size_t len,
 399                                  struct ieee80211_rx_status *rx_status,
 400                                  struct ieee802_11_elems *elems,
 401                                  bool beacon)
 402{
 403        struct ieee80211_local *local = sdata->local;
 404        int freq;
 405        struct cfg80211_bss *cbss;
 406        struct ieee80211_bss *bss;
 407        struct sta_info *sta;
 408        struct ieee80211_channel *channel;
 409        u64 beacon_timestamp, rx_timestamp;
 410        u32 supp_rates = 0;
 411        enum ieee80211_band band = rx_status->band;
 412        struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band];
 413        bool rates_updated = false;
 414
 415        if (elems->ds_params && elems->ds_params_len == 1)
 416                freq = ieee80211_channel_to_frequency(elems->ds_params[0],
 417                                                      band);
 418        else
 419                freq = rx_status->freq;
 420
 421        channel = ieee80211_get_channel(local->hw.wiphy, freq);
 422
 423        if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
 424                return;
 425
 426        if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
 427            ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid)) {
 428
 429                rcu_read_lock();
 430                sta = sta_info_get(sdata, mgmt->sa);
 431
 432                if (elems->supp_rates) {
 433                        supp_rates = ieee80211_sta_get_rates(local, elems,
 434                                                             band, NULL);
 435                        if (sta) {
 436                                u32 prev_rates;
 437
 438                                prev_rates = sta->sta.supp_rates[band];
 439                                /* make sure mandatory rates are always added */
 440                                sta->sta.supp_rates[band] = supp_rates |
 441                                        ieee80211_mandatory_rates(local, band);
 442
 443                                if (sta->sta.supp_rates[band] != prev_rates) {
 444                                        ibss_dbg(sdata,
 445                                                 "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n",
 446                                                 sta->sta.addr, prev_rates,
 447                                                 sta->sta.supp_rates[band]);
 448                                        rates_updated = true;
 449                                }
 450                        } else {
 451                                rcu_read_unlock();
 452                                sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid,
 453                                                mgmt->sa, supp_rates, true);
 454                        }
 455                }
 456
 457                if (sta && elems->wmm_info)
 458                        set_sta_flag(sta, WLAN_STA_WME);
 459
 460                if (sta && elems->ht_operation && elems->ht_cap_elem &&
 461                    sdata->u.ibss.channel_type != NL80211_CHAN_NO_HT) {
 462                        /* we both use HT */
 463                        struct ieee80211_sta_ht_cap sta_ht_cap_new;
 464                        enum nl80211_channel_type channel_type =
 465                                ieee80211_ht_oper_to_channel_type(
 466                                                        elems->ht_operation);
 467
 468                        ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
 469                                                          elems->ht_cap_elem,
 470                                                          &sta_ht_cap_new);
 471
 472                        /*
 473                         * fall back to HT20 if we don't use or use
 474                         * the other extension channel
 475                         */
 476                        if (!(channel_type == NL80211_CHAN_HT40MINUS ||
 477                              channel_type == NL80211_CHAN_HT40PLUS) ||
 478                            channel_type != sdata->u.ibss.channel_type)
 479                                sta_ht_cap_new.cap &=
 480                                        ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 481
 482                        if (memcmp(&sta->sta.ht_cap, &sta_ht_cap_new,
 483                                   sizeof(sta_ht_cap_new))) {
 484                                memcpy(&sta->sta.ht_cap, &sta_ht_cap_new,
 485                                       sizeof(sta_ht_cap_new));
 486                                rates_updated = true;
 487                        }
 488                }
 489
 490                if (sta && rates_updated) {
 491                        drv_sta_rc_update(local, sdata, &sta->sta,
 492                                          IEEE80211_RC_SUPP_RATES_CHANGED);
 493                        rate_control_rate_init(sta);
 494                }
 495
 496                rcu_read_unlock();
 497        }
 498
 499        bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
 500                                        channel, beacon);
 501        if (!bss)
 502                return;
 503
 504        cbss = container_of((void *)bss, struct cfg80211_bss, priv);
 505
 506        /* was just updated in ieee80211_bss_info_update */
 507        beacon_timestamp = cbss->tsf;
 508
 509        /* check if we need to merge IBSS */
 510
 511        /* we use a fixed BSSID */
 512        if (sdata->u.ibss.fixed_bssid)
 513                goto put_bss;
 514
 515        /* not an IBSS */
 516        if (!(cbss->capability & WLAN_CAPABILITY_IBSS))
 517                goto put_bss;
 518
 519        /* different channel */
 520        if (cbss->channel != local->oper_channel)
 521                goto put_bss;
 522
 523        /* different SSID */
 524        if (elems->ssid_len != sdata->u.ibss.ssid_len ||
 525            memcmp(elems->ssid, sdata->u.ibss.ssid,
 526                                sdata->u.ibss.ssid_len))
 527                goto put_bss;
 528
 529        /* same BSSID */
 530        if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid))
 531                goto put_bss;
 532
 533        if (rx_status->flag & RX_FLAG_MACTIME_MPDU) {
 534                /*
 535                 * For correct IBSS merging we need mactime; since mactime is
 536                 * defined as the time the first data symbol of the frame hits
 537                 * the PHY, and the timestamp of the beacon is defined as "the
 538                 * time that the data symbol containing the first bit of the
 539                 * timestamp is transmitted to the PHY plus the transmitting
 540                 * STA's delays through its local PHY from the MAC-PHY
 541                 * interface to its interface with the WM" (802.11 11.1.2)
 542                 * - equals the time this bit arrives at the receiver - we have
 543                 * to take into account the offset between the two.
 544                 *
 545                 * E.g. at 1 MBit that means mactime is 192 usec earlier
 546                 * (=24 bytes * 8 usecs/byte) than the beacon timestamp.
 547                 */
 548                int rate;
 549
 550                if (rx_status->flag & RX_FLAG_HT)
 551                        rate = 65; /* TODO: HT rates */
 552                else
 553                        rate = local->hw.wiphy->bands[band]->
 554                                bitrates[rx_status->rate_idx].bitrate;
 555
 556                rx_timestamp = rx_status->mactime + (24 * 8 * 10 / rate);
 557        } else {
 558                /*
 559                 * second best option: get current TSF
 560                 * (will return -1 if not supported)
 561                 */
 562                rx_timestamp = drv_get_tsf(local, sdata);
 563        }
 564
 565        ibss_dbg(sdata,
 566                 "RX beacon SA=%pM BSSID=%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
 567                 mgmt->sa, mgmt->bssid,
 568                 (unsigned long long)rx_timestamp,
 569                 (unsigned long long)beacon_timestamp,
 570                 (unsigned long long)(rx_timestamp - beacon_timestamp),
 571                 jiffies);
 572
 573        if (beacon_timestamp > rx_timestamp) {
 574                ibss_dbg(sdata,
 575                         "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n",
 576                         mgmt->bssid);
 577                ieee80211_sta_join_ibss(sdata, bss);
 578                supp_rates = ieee80211_sta_get_rates(local, elems, band, NULL);
 579                ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa,
 580                                       supp_rates, true);
 581                rcu_read_unlock();
 582        }
 583
 584 put_bss:
 585        ieee80211_rx_bss_put(local, bss);
 586}
 587
 588void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata,
 589                              const u8 *bssid, const u8 *addr,
 590                              u32 supp_rates)
 591{
 592        struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 593        struct ieee80211_local *local = sdata->local;
 594        struct sta_info *sta;
 595        int band = local->oper_channel->band;
 596
 597        /*
 598         * XXX: Consider removing the least recently used entry and
 599         *      allow new one to be added.
 600         */
 601        if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
 602                net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
 603                                    sdata->name, addr);
 604                return;
 605        }
 606
 607        if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH)
 608                return;
 609
 610        if (!ether_addr_equal(bssid, sdata->u.ibss.bssid))
 611                return;
 612
 613        sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
 614        if (!sta)
 615                return;
 616
 617        sta->last_rx = jiffies;
 618
 619        /* make sure mandatory rates are always added */
 620        sta->sta.supp_rates[band] = supp_rates |
 621                        ieee80211_mandatory_rates(local, band);
 622
 623        spin_lock(&ifibss->incomplete_lock);
 624        list_add(&sta->list, &ifibss->incomplete_stations);
 625        spin_unlock(&ifibss->incomplete_lock);
 626        ieee80211_queue_work(&local->hw, &sdata->work);
 627}
 628
 629static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
 630{
 631        struct ieee80211_local *local = sdata->local;
 632        int active = 0;
 633        struct sta_info *sta;
 634
 635        lockdep_assert_held(&sdata->u.ibss.mtx);
 636
 637        rcu_read_lock();
 638
 639        list_for_each_entry_rcu(sta, &local->sta_list, list) {
 640                if (sta->sdata == sdata &&
 641                    time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
 642                               jiffies)) {
 643                        active++;
 644                        break;
 645                }
 646        }
 647
 648        rcu_read_unlock();
 649
 650        return active;
 651}
 652
 653/*
 654 * This function is called with state == IEEE80211_IBSS_MLME_JOINED
 655 */
 656
 657static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
 658{
 659        struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 660
 661        lockdep_assert_held(&ifibss->mtx);
 662
 663        mod_timer(&ifibss->timer,
 664                  round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
 665
 666        ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT);
 667
 668        if (time_before(jiffies, ifibss->last_scan_completed +
 669                       IEEE80211_IBSS_MERGE_INTERVAL))
 670                return;
 671
 672        if (ieee80211_sta_active_ibss(sdata))
 673                return;
 674
 675        if (ifibss->fixed_channel)
 676                return;
 677
 678        sdata_info(sdata,
 679                   "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n");
 680
 681        ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len,
 682                                    NULL);
 683}
 684
 685static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
 686{
 687        struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 688        u8 bssid[ETH_ALEN];
 689        u16 capability;
 690        int i;
 691
 692        lockdep_assert_held(&ifibss->mtx);
 693
 694        if (ifibss->fixed_bssid) {
 695                memcpy(bssid, ifibss->bssid, ETH_ALEN);
 696        } else {
 697                /* Generate random, not broadcast, locally administered BSSID. Mix in
 698                 * own MAC address to make sure that devices that do not have proper
 699                 * random number generator get different BSSID. */
 700                get_random_bytes(bssid, ETH_ALEN);
 701                for (i = 0; i < ETH_ALEN; i++)
 702                        bssid[i] ^= sdata->vif.addr[i];
 703                bssid[0] &= ~0x01;
 704                bssid[0] |= 0x02;
 705        }
 706
 707        sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid);
 708
 709        capability = WLAN_CAPABILITY_IBSS;
 710
 711        if (ifibss->privacy)
 712                capability |= WLAN_CAPABILITY_PRIVACY;
 713        else
 714                sdata->drop_unencrypted = 0;
 715
 716        __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int,
 717                                  ifibss->channel, ifibss->basic_rates,
 718                                  capability, 0);
 719}
 720
 721/*
 722 * This function is called with state == IEEE80211_IBSS_MLME_SEARCH
 723 */
 724
 725static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
 726{
 727        struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 728        struct ieee80211_local *local = sdata->local;
 729        struct cfg80211_bss *cbss;
 730        struct ieee80211_channel *chan = NULL;
 731        const u8 *bssid = NULL;
 732        int active_ibss;
 733        u16 capability;
 734
 735        lockdep_assert_held(&ifibss->mtx);
 736
 737        active_ibss = ieee80211_sta_active_ibss(sdata);
 738        ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss);
 739
 740        if (active_ibss)
 741                return;
 742
 743        capability = WLAN_CAPABILITY_IBSS;
 744        if (ifibss->privacy)
 745                capability |= WLAN_CAPABILITY_PRIVACY;
 746        if (ifibss->fixed_bssid)
 747                bssid = ifibss->bssid;
 748        if (ifibss->fixed_channel)
 749                chan = ifibss->channel;
 750        if (!is_zero_ether_addr(ifibss->bssid))
 751                bssid = ifibss->bssid;
 752        cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid,
 753                                ifibss->ssid, ifibss->ssid_len,
 754                                WLAN_CAPABILITY_IBSS | WLAN_CAPABILITY_PRIVACY,
 755                                capability);
 756
 757        if (cbss) {
 758                struct ieee80211_bss *bss;
 759
 760                bss = (void *)cbss->priv;
 761                ibss_dbg(sdata,
 762                         "sta_find_ibss: selected %pM current %pM\n",
 763                         cbss->bssid, ifibss->bssid);
 764                sdata_info(sdata,
 765                           "Selected IBSS BSSID %pM based on configured SSID\n",
 766                           cbss->bssid);
 767
 768                ieee80211_sta_join_ibss(sdata, bss);
 769                ieee80211_rx_bss_put(local, bss);
 770                return;
 771        }
 772
 773        ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n");
 774
 775        /* Selected IBSS not found in current scan results - try to scan */
 776        if (time_after(jiffies, ifibss->last_scan_completed +
 777                                        IEEE80211_SCAN_INTERVAL)) {
 778                sdata_info(sdata, "Trigger new scan to find an IBSS to join\n");
 779
 780                ieee80211_request_ibss_scan(sdata, ifibss->ssid,
 781                                            ifibss->ssid_len, chan);
 782        } else {
 783                int interval = IEEE80211_SCAN_INTERVAL;
 784
 785                if (time_after(jiffies, ifibss->ibss_join_req +
 786                               IEEE80211_IBSS_JOIN_TIMEOUT)) {
 787                        if (!(local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS)) {
 788                                ieee80211_sta_create_ibss(sdata);
 789                                return;
 790                        }
 791                        sdata_info(sdata, "IBSS not allowed on %d MHz\n",
 792                                   local->oper_channel->center_freq);
 793
 794                        /* No IBSS found - decrease scan interval and continue
 795                         * scanning. */
 796                        interval = IEEE80211_SCAN_INTERVAL_SLOW;
 797                }
 798
 799                mod_timer(&ifibss->timer,
 800                          round_jiffies(jiffies + interval));
 801        }
 802}
 803
 804static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
 805                                        struct sk_buff *req)
 806{
 807        struct ieee80211_mgmt *mgmt = (void *)req->data;
 808        struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 809        struct ieee80211_local *local = sdata->local;
 810        int tx_last_beacon, len = req->len;
 811        struct sk_buff *skb;
 812        struct ieee80211_mgmt *resp;
 813        struct sk_buff *presp;
 814        u8 *pos, *end;
 815
 816        lockdep_assert_held(&ifibss->mtx);
 817
 818        presp = rcu_dereference_protected(ifibss->presp,
 819                                          lockdep_is_held(&ifibss->mtx));
 820
 821        if (ifibss->state != IEEE80211_IBSS_MLME_JOINED ||
 822            len < 24 + 2 || !presp)
 823                return;
 824
 825        tx_last_beacon = drv_tx_last_beacon(local);
 826
 827        ibss_dbg(sdata,
 828                 "RX ProbeReq SA=%pM DA=%pM BSSID=%pM (tx_last_beacon=%d)\n",
 829                 mgmt->sa, mgmt->da, mgmt->bssid, tx_last_beacon);
 830
 831        if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da))
 832                return;
 833
 834        if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) &&
 835            !is_broadcast_ether_addr(mgmt->bssid))
 836                return;
 837
 838        end = ((u8 *) mgmt) + len;
 839        pos = mgmt->u.probe_req.variable;
 840        if (pos[0] != WLAN_EID_SSID ||
 841            pos + 2 + pos[1] > end) {
 842                ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n",
 843                         mgmt->sa);
 844                return;
 845        }
 846        if (pos[1] != 0 &&
 847            (pos[1] != ifibss->ssid_len ||
 848             memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) {
 849                /* Ignore ProbeReq for foreign SSID */
 850                return;
 851        }
 852
 853        /* Reply with ProbeResp */
 854        skb = skb_copy(presp, GFP_KERNEL);
 855        if (!skb)
 856                return;
 857
 858        resp = (struct ieee80211_mgmt *) skb->data;
 859        memcpy(resp->da, mgmt->sa, ETH_ALEN);
 860        ibss_dbg(sdata, "Sending ProbeResp to %pM\n", resp->da);
 861        IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 862        ieee80211_tx_skb(sdata, skb);
 863}
 864
 865static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
 866                                         struct ieee80211_mgmt *mgmt,
 867                                         size_t len,
 868                                         struct ieee80211_rx_status *rx_status)
 869{
 870        size_t baselen;
 871        struct ieee802_11_elems elems;
 872
 873        baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
 874        if (baselen > len)
 875                return;
 876
 877        ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
 878                                &elems);
 879
 880        ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
 881}
 882
 883static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
 884                                     struct ieee80211_mgmt *mgmt,
 885                                     size_t len,
 886                                     struct ieee80211_rx_status *rx_status)
 887{
 888        size_t baselen;
 889        struct ieee802_11_elems elems;
 890
 891        /* Process beacon from the current BSS */
 892        baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
 893        if (baselen > len)
 894                return;
 895
 896        ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems);
 897
 898        ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true);
 899}
 900
 901void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
 902                                   struct sk_buff *skb)
 903{
 904        struct ieee80211_rx_status *rx_status;
 905        struct ieee80211_mgmt *mgmt;
 906        u16 fc;
 907
 908        rx_status = IEEE80211_SKB_RXCB(skb);
 909        mgmt = (struct ieee80211_mgmt *) skb->data;
 910        fc = le16_to_cpu(mgmt->frame_control);
 911
 912        mutex_lock(&sdata->u.ibss.mtx);
 913
 914        if (!sdata->u.ibss.ssid_len)
 915                goto mgmt_out; /* not ready to merge yet */
 916
 917        switch (fc & IEEE80211_FCTL_STYPE) {
 918        case IEEE80211_STYPE_PROBE_REQ:
 919                ieee80211_rx_mgmt_probe_req(sdata, skb);
 920                break;
 921        case IEEE80211_STYPE_PROBE_RESP:
 922                ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len,
 923                                             rx_status);
 924                break;
 925        case IEEE80211_STYPE_BEACON:
 926                ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
 927                                         rx_status);
 928                break;
 929        case IEEE80211_STYPE_AUTH:
 930                ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len);
 931                break;
 932        case IEEE80211_STYPE_DEAUTH:
 933                ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len);
 934                break;
 935        }
 936
 937 mgmt_out:
 938        mutex_unlock(&sdata->u.ibss.mtx);
 939}
 940
 941void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata)
 942{
 943        struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 944        struct sta_info *sta;
 945
 946        mutex_lock(&ifibss->mtx);
 947
 948        /*
 949         * Work could be scheduled after scan or similar
 950         * when we aren't even joined (or trying) with a
 951         * network.
 952         */
 953        if (!ifibss->ssid_len)
 954                goto out;
 955
 956        spin_lock_bh(&ifibss->incomplete_lock);
 957        while (!list_empty(&ifibss->incomplete_stations)) {
 958                sta = list_first_entry(&ifibss->incomplete_stations,
 959                                       struct sta_info, list);
 960                list_del(&sta->list);
 961                spin_unlock_bh(&ifibss->incomplete_lock);
 962
 963                ieee80211_ibss_finish_sta(sta, true);
 964                rcu_read_unlock();
 965                spin_lock_bh(&ifibss->incomplete_lock);
 966        }
 967        spin_unlock_bh(&ifibss->incomplete_lock);
 968
 969        switch (ifibss->state) {
 970        case IEEE80211_IBSS_MLME_SEARCH:
 971                ieee80211_sta_find_ibss(sdata);
 972                break;
 973        case IEEE80211_IBSS_MLME_JOINED:
 974                ieee80211_sta_merge_ibss(sdata);
 975                break;
 976        default:
 977                WARN_ON(1);
 978                break;
 979        }
 980
 981 out:
 982        mutex_unlock(&ifibss->mtx);
 983}
 984
 985static void ieee80211_ibss_timer(unsigned long data)
 986{
 987        struct ieee80211_sub_if_data *sdata =
 988                (struct ieee80211_sub_if_data *) data;
 989        struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 990        struct ieee80211_local *local = sdata->local;
 991
 992        if (local->quiescing) {
 993                ifibss->timer_running = true;
 994                return;
 995        }
 996
 997        ieee80211_queue_work(&local->hw, &sdata->work);
 998}
 999
1000#ifdef CONFIG_PM
1001void ieee80211_ibss_quiesce(struct ieee80211_sub_if_data *sdata)
1002{
1003        struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1004
1005        if (del_timer_sync(&ifibss->timer))
1006                ifibss->timer_running = true;
1007}
1008
1009void ieee80211_ibss_restart(struct ieee80211_sub_if_data *sdata)
1010{
1011        struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1012
1013        if (ifibss->timer_running) {
1014                add_timer(&ifibss->timer);
1015                ifibss->timer_running = false;
1016        }
1017}
1018#endif
1019
1020void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata)
1021{
1022        struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1023
1024        setup_timer(&ifibss->timer, ieee80211_ibss_timer,
1025                    (unsigned long) sdata);
1026        mutex_init(&ifibss->mtx);
1027        INIT_LIST_HEAD(&ifibss->incomplete_stations);
1028        spin_lock_init(&ifibss->incomplete_lock);
1029}
1030
1031/* scan finished notification */
1032void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local)
1033{
1034        struct ieee80211_sub_if_data *sdata;
1035
1036        mutex_lock(&local->iflist_mtx);
1037        list_for_each_entry(sdata, &local->interfaces, list) {
1038                if (!ieee80211_sdata_running(sdata))
1039                        continue;
1040                if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
1041                        continue;
1042                sdata->u.ibss.last_scan_completed = jiffies;
1043                ieee80211_queue_work(&local->hw, &sdata->work);
1044        }
1045        mutex_unlock(&local->iflist_mtx);
1046}
1047
1048int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
1049                        struct cfg80211_ibss_params *params)
1050{
1051        struct sk_buff *skb;
1052        u32 changed = 0;
1053
1054        skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom +
1055                            sizeof(struct ieee80211_hdr_3addr) +
1056                            12 /* struct ieee80211_mgmt.u.beacon */ +
1057                            2 + IEEE80211_MAX_SSID_LEN /* max SSID */ +
1058                            2 + 8 /* max Supported Rates */ +
1059                            3 /* max DS params */ +
1060                            4 /* IBSS params */ +
1061                            2 + (IEEE80211_MAX_SUPP_RATES - 8) +
1062                            2 + sizeof(struct ieee80211_ht_cap) +
1063                            2 + sizeof(struct ieee80211_ht_operation) +
1064                            params->ie_len);
1065        if (!skb)
1066                return -ENOMEM;
1067
1068        mutex_lock(&sdata->u.ibss.mtx);
1069
1070        if (params->bssid) {
1071                memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN);
1072                sdata->u.ibss.fixed_bssid = true;
1073        } else
1074                sdata->u.ibss.fixed_bssid = false;
1075
1076        sdata->u.ibss.privacy = params->privacy;
1077        sdata->u.ibss.control_port = params->control_port;
1078        sdata->u.ibss.basic_rates = params->basic_rates;
1079        memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate,
1080               sizeof(params->mcast_rate));
1081
1082        sdata->vif.bss_conf.beacon_int = params->beacon_interval;
1083
1084        sdata->u.ibss.channel = params->channel;
1085        sdata->u.ibss.channel_type = params->channel_type;
1086        sdata->u.ibss.fixed_channel = params->channel_fixed;
1087
1088        /* fix ourselves to that channel now already */
1089        if (params->channel_fixed) {
1090                sdata->local->oper_channel = params->channel;
1091                if (!ieee80211_set_channel_type(sdata->local, sdata,
1092                                               params->channel_type)) {
1093                        mutex_unlock(&sdata->u.ibss.mtx);
1094                        kfree_skb(skb);
1095                        return -EINVAL;
1096                }
1097        }
1098
1099        if (params->ie) {
1100                sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len,
1101                                           GFP_KERNEL);
1102                if (sdata->u.ibss.ie)
1103                        sdata->u.ibss.ie_len = params->ie_len;
1104        }
1105
1106        sdata->u.ibss.skb = skb;
1107        sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
1108        sdata->u.ibss.ibss_join_req = jiffies;
1109
1110        memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len);
1111        sdata->u.ibss.ssid_len = params->ssid_len;
1112
1113        mutex_unlock(&sdata->u.ibss.mtx);
1114
1115        mutex_lock(&sdata->local->mtx);
1116        ieee80211_recalc_idle(sdata->local);
1117        mutex_unlock(&sdata->local->mtx);
1118
1119        /*
1120         * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is
1121         * reserved, but an HT STA shall protect HT transmissions as though
1122         * the HT Protection field were set to non-HT mixed mode.
1123         *
1124         * In an IBSS, the RIFS Mode field of the HT Operation element is
1125         * also reserved, but an HT STA shall operate as though this field
1126         * were set to 1.
1127         */
1128
1129        sdata->vif.bss_conf.ht_operation_mode |=
1130                  IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED
1131                | IEEE80211_HT_PARAM_RIFS_MODE;
1132
1133        changed |= BSS_CHANGED_HT;
1134        ieee80211_bss_info_change_notify(sdata, changed);
1135
1136        ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1137
1138        return 0;
1139}
1140
1141int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata)
1142{
1143        struct sk_buff *skb;
1144        struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1145        struct ieee80211_local *local = sdata->local;
1146        struct cfg80211_bss *cbss;
1147        u16 capability;
1148        int active_ibss;
1149        struct sta_info *sta;
1150
1151        mutex_lock(&sdata->u.ibss.mtx);
1152
1153        active_ibss = ieee80211_sta_active_ibss(sdata);
1154
1155        if (!active_ibss && !is_zero_ether_addr(ifibss->bssid)) {
1156                capability = WLAN_CAPABILITY_IBSS;
1157
1158                if (ifibss->privacy)
1159                        capability |= WLAN_CAPABILITY_PRIVACY;
1160
1161                cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->channel,
1162                                        ifibss->bssid, ifibss->ssid,
1163                                        ifibss->ssid_len, WLAN_CAPABILITY_IBSS |
1164                                        WLAN_CAPABILITY_PRIVACY,
1165                                        capability);
1166
1167                if (cbss) {
1168                        cfg80211_unlink_bss(local->hw.wiphy, cbss);
1169                        cfg80211_put_bss(cbss);
1170                }
1171        }
1172
1173        ifibss->state = IEEE80211_IBSS_MLME_SEARCH;
1174        memset(ifibss->bssid, 0, ETH_ALEN);
1175        ifibss->ssid_len = 0;
1176
1177        sta_info_flush(sdata->local, sdata);
1178
1179        spin_lock_bh(&ifibss->incomplete_lock);
1180        while (!list_empty(&ifibss->incomplete_stations)) {
1181                sta = list_first_entry(&ifibss->incomplete_stations,
1182                                       struct sta_info, list);
1183                list_del(&sta->list);
1184                spin_unlock_bh(&ifibss->incomplete_lock);
1185
1186                sta_info_free(local, sta);
1187                spin_lock_bh(&ifibss->incomplete_lock);
1188        }
1189        spin_unlock_bh(&ifibss->incomplete_lock);
1190
1191        netif_carrier_off(sdata->dev);
1192
1193        /* remove beacon */
1194        kfree(sdata->u.ibss.ie);
1195        skb = rcu_dereference_protected(sdata->u.ibss.presp,
1196                                        lockdep_is_held(&sdata->u.ibss.mtx));
1197        RCU_INIT_POINTER(sdata->u.ibss.presp, NULL);
1198        sdata->vif.bss_conf.ibss_joined = false;
1199        ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED |
1200                                                BSS_CHANGED_IBSS);
1201        synchronize_rcu();
1202        kfree_skb(skb);
1203
1204        skb_queue_purge(&sdata->skb_queue);
1205
1206        del_timer_sync(&sdata->u.ibss.timer);
1207
1208        mutex_unlock(&sdata->u.ibss.mtx);
1209
1210        mutex_lock(&local->mtx);
1211        ieee80211_recalc_idle(sdata->local);
1212        mutex_unlock(&local->mtx);
1213
1214        return 0;
1215}
1216
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