net/mac80211/ibss.c

   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_IBSS_JOIN_TIMEOUT (7 * HZ)
  30
  31 #define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ)
  32 #define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ)
  33
  34 #define IEEE80211_IBSS_MAX_STA_ENTRIES 128
  35
  36
  37 static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
  38                                       const u8 *bssid, const int beacon_int,
  39                                       struct ieee80211_channel *chan,
  40                                       const u32 basic_rates,
  41                                       const u16 capability, u64 tsf,
  42                                       bool creator)
  43 {
  44         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
  45         struct ieee80211_local *local = sdata->local;
  46         int rates, i;
  47         struct ieee80211_mgmt *mgmt;
  48         u8 *pos;
  49         struct ieee80211_supported_band *sband;
  50         struct cfg80211_bss *bss;
  51         u32 bss_change;
  52         u8 supp_rates[IEEE80211_MAX_SUPP_RATES];
  53         struct cfg80211_chan_def chandef;
  54         struct beacon_data *presp;
  55         int frame_len;
  56
  57         sdata_assert_lock(sdata);
  58
  59         /* Reset own TSF to allow time synchronization work. */
  60         drv_reset_tsf(local, sdata);
  61
  62         if (!ether_addr_equal(ifibss->bssid, bssid))
  63                 sta_info_flush(sdata);
  64
  65         /* if merging, indicate to driver that we leave the old IBSS */
  66         if (sdata->vif.bss_conf.ibss_joined) {
  67                 sdata->vif.bss_conf.ibss_joined = false;
  68                 sdata->vif.bss_conf.ibss_creator = false;
  69                 sdata->vif.bss_conf.enable_beacon = false;
  70                 netif_carrier_off(sdata->dev);
  71                 ieee80211_bss_info_change_notify(sdata,
  72                                                  BSS_CHANGED_IBSS |
  73                                                  BSS_CHANGED_BEACON_ENABLED);
  74         }
  75
  76         presp = rcu_dereference_protected(ifibss->presp,
  77                                           lockdep_is_held(&sdata->wdev.mtx));
  78         rcu_assign_pointer(ifibss->presp, NULL);
  79         if (presp)
  80                 kfree_rcu(presp, rcu_head);
  81
  82         sdata->drop_unencrypted = capability & WLAN_CAPABILITY_PRIVACY ? 1 : 0;
  83
  84         chandef = ifibss->chandef;
  85         if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef)) {
  86                 chandef.width = NL80211_CHAN_WIDTH_20;
  87                 chandef.center_freq1 = chan->center_freq;
  88         }
  89
  90         ieee80211_vif_release_channel(sdata);
  91         if (ieee80211_vif_use_channel(sdata, &chandef,
  92                                       ifibss->fixed_channel ?
  93                                         IEEE80211_CHANCTX_SHARED :
  94                                         IEEE80211_CHANCTX_EXCLUSIVE)) {
  95                 sdata_info(sdata, "Failed to join IBSS, no channel context\n");
  96                 return;
  97         }
  98
  99         memcpy(ifibss->bssid, bssid, ETH_ALEN);
 100
 101         sband = local->hw.wiphy->bands[chan->band];
 102
 103         /* Build IBSS probe response */
 104         frame_len = sizeof(struct ieee80211_hdr_3addr) +
 105                     12 /* struct ieee80211_mgmt.u.beacon */ +
 106                     2 + IEEE80211_MAX_SSID_LEN /* max SSID */ +
 107                     2 + 8 /* max Supported Rates */ +
 108                     3 /* max DS params */ +
 109                     4 /* IBSS params */ +
 110                     2 + (IEEE80211_MAX_SUPP_RATES - 8) +
 111                     2 + sizeof(struct ieee80211_ht_cap) +
 112                     2 + sizeof(struct ieee80211_ht_operation) +
 113                     ifibss->ie_len;
 114         presp = kzalloc(sizeof(*presp) + frame_len, GFP_KERNEL);
 115         if (!presp)
 116                 return;
 117
 118         presp->head = (void *)(presp + 1);
 119
 120         mgmt = (void *) presp->head;
 121         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 122                                           IEEE80211_STYPE_PROBE_RESP);
 123         eth_broadcast_addr(mgmt->da);
 124         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 125         memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN);
 126         mgmt->u.beacon.beacon_int = cpu_to_le16(beacon_int);
 127         mgmt->u.beacon.timestamp = cpu_to_le64(tsf);
 128         mgmt->u.beacon.capab_info = cpu_to_le16(capability);
 129
 130         pos = (u8 *)mgmt + offsetof(struct ieee80211_mgmt, u.beacon.variable);
 131
 132         *pos++ = WLAN_EID_SSID;
 133         *pos++ = ifibss->ssid_len;
 134         memcpy(pos, ifibss->ssid, ifibss->ssid_len);
 135         pos += ifibss->ssid_len;
 136
 137         rates = min_t(int, 8, sband->n_bitrates);
 138         *pos++ = WLAN_EID_SUPP_RATES;
 139         *pos++ = rates;
 140         for (i = 0; i < rates; i++) {
 141                 int rate = sband->bitrates[i].bitrate;
 142                 u8 basic = 0;
 143                 if (basic_rates & BIT(i))
 144                         basic = 0x80;
 145                 *pos++ = basic | (u8) (rate / 5);
 146         }
 147
 148         if (sband->band == IEEE80211_BAND_2GHZ) {
 149                 *pos++ = WLAN_EID_DS_PARAMS;
 150                 *pos++ = 1;
 151                 *pos++ = ieee80211_frequency_to_channel(chan->center_freq);
 152         }
 153
 154         *pos++ = WLAN_EID_IBSS_PARAMS;
 155         *pos++ = 2;
 156         /* FIX: set ATIM window based on scan results */
 157         *pos++ = 0;
 158         *pos++ = 0;
 159
 160         if (sband->n_bitrates > 8) {
 161                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 162                 *pos++ = sband->n_bitrates - 8;
 163                 for (i = 8; i < sband->n_bitrates; i++) {
 164                         int rate = sband->bitrates[i].bitrate;
 165                         u8 basic = 0;
 166                         if (basic_rates & BIT(i))
 167                                 basic = 0x80;
 168                         *pos++ = basic | (u8) (rate / 5);
 169                 }
 170         }
 171
 172         if (ifibss->ie_len) {
 173                 memcpy(pos, ifibss->ie, ifibss->ie_len);
 174                 pos += ifibss->ie_len;
 175         }
 176
 177         /* add HT capability and information IEs */
 178         if (chandef.width != NL80211_CHAN_WIDTH_20_NOHT &&
 179             chandef.width != NL80211_CHAN_WIDTH_5 &&
 180             chandef.width != NL80211_CHAN_WIDTH_10 &&
 181             sband->ht_cap.ht_supported) {
 182                 pos = ieee80211_ie_build_ht_cap(pos, &sband->ht_cap,
 183                                                 sband->ht_cap.cap);
 184                 /*
 185                  * Note: According to 802.11n-2009 9.13.3.1, HT Protection
 186                  * field and RIFS Mode are reserved in IBSS mode, therefore
 187                  * keep them at 0
 188                  */
 189                 pos = ieee80211_ie_build_ht_oper(pos, &sband->ht_cap,
 190                                                  &chandef, 0);
 191         }
 192
 193         if (local->hw.queues >= IEEE80211_NUM_ACS) {
 194                 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
 195                 *pos++ = 7; /* len */
 196                 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
 197                 *pos++ = 0x50;
 198                 *pos++ = 0xf2;
 199                 *pos++ = 2; /* WME */
 200                 *pos++ = 0; /* WME info */
 201                 *pos++ = 1; /* WME ver */
 202                 *pos++ = 0; /* U-APSD no in use */
 203         }
 204
 205         presp->head_len = pos - presp->head;
 206         if (WARN_ON(presp->head_len > frame_len))
 207                 return;
 208
 209         rcu_assign_pointer(ifibss->presp, presp);
 210
 211         sdata->vif.bss_conf.enable_beacon = true;
 212         sdata->vif.bss_conf.beacon_int = beacon_int;
 213         sdata->vif.bss_conf.basic_rates = basic_rates;
 214         sdata->vif.bss_conf.ssid_len = ifibss->ssid_len;
 215         memcpy(sdata->vif.bss_conf.ssid, ifibss->ssid, ifibss->ssid_len);
 216         bss_change = BSS_CHANGED_BEACON_INT;
 217         bss_change |= ieee80211_reset_erp_info(sdata);
 218         bss_change |= BSS_CHANGED_BSSID;
 219         bss_change |= BSS_CHANGED_BEACON;
 220         bss_change |= BSS_CHANGED_BEACON_ENABLED;
 221         bss_change |= BSS_CHANGED_BASIC_RATES;
 222         bss_change |= BSS_CHANGED_HT;
 223         bss_change |= BSS_CHANGED_IBSS;
 224         bss_change |= BSS_CHANGED_SSID;
 225
 226         /*
 227          * In 5 GHz/802.11a, we can always use short slot time.
 228          * (IEEE 802.11-2012 18.3.8.7)
 229          *
 230          * In 2.4GHz, we must always use long slots in IBSS for compatibility
 231          * reasons.
 232          * (IEEE 802.11-2012 19.4.5)
 233          *
 234          * HT follows these specifications (IEEE 802.11-2012 20.3.18)
 235          */
 236         sdata->vif.bss_conf.use_short_slot = chan->band == IEEE80211_BAND_5GHZ;
 237         bss_change |= BSS_CHANGED_ERP_SLOT;
 238
 239         sdata->vif.bss_conf.ibss_joined = true;
 240         sdata->vif.bss_conf.ibss_creator = creator;
 241         ieee80211_bss_info_change_notify(sdata, bss_change);
 242
 243         ieee80211_sta_def_wmm_params(sdata, sband->n_bitrates, supp_rates);
 244
 245         ifibss->state = IEEE80211_IBSS_MLME_JOINED;
 246         mod_timer(&ifibss->timer,
 247                   round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
 248
 249         bss = cfg80211_inform_bss_frame(local->hw.wiphy, chan,
 250                                         mgmt, presp->head_len, 0, GFP_KERNEL);
 251         cfg80211_put_bss(local->hw.wiphy, bss);
 252         netif_carrier_on(sdata->dev);
 253         cfg80211_ibss_joined(sdata->dev, ifibss->bssid, GFP_KERNEL);
 254 }
 255
 256 static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
 257                                     struct ieee80211_bss *bss)
 258 {
 259         struct cfg80211_bss *cbss =
 260                 container_of((void *)bss, struct cfg80211_bss, priv);
 261         struct ieee80211_supported_band *sband;
 262         u32 basic_rates;
 263         int i, j;
 264         u16 beacon_int = cbss->beacon_interval;
 265         const struct cfg80211_bss_ies *ies;
 266         u64 tsf;
 267
 268         sdata_assert_lock(sdata);
 269
 270         if (beacon_int < 10)
 271                 beacon_int = 10;
 272
 273         sband = sdata->local->hw.wiphy->bands[cbss->channel->band];
 274
 275         basic_rates = 0;
 276
 277         for (i = 0; i < bss->supp_rates_len; i++) {
 278                 int rate = (bss->supp_rates[i] & 0x7f) * 5;
 279                 bool is_basic = !!(bss->supp_rates[i] & 0x80);
 280
 281                 for (j = 0; j < sband->n_bitrates; j++) {
 282                         if (sband->bitrates[j].bitrate == rate) {
 283                                 if (is_basic)
 284                                         basic_rates |= BIT(j);
 285                                 break;
 286                         }
 287                 }
 288         }
 289
 290         rcu_read_lock();
 291         ies = rcu_dereference(cbss->ies);
 292         tsf = ies->tsf;
 293         rcu_read_unlock();
 294
 295         __ieee80211_sta_join_ibss(sdata, cbss->bssid,
 296                                   beacon_int,
 297                                   cbss->channel,
 298                                   basic_rates,
 299                                   cbss->capability,
 300                                   tsf, false);
 301 }
 302
 303 static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta)
 304         __acquires(RCU)
 305 {
 306         struct ieee80211_sub_if_data *sdata = sta->sdata;
 307         u8 addr[ETH_ALEN];
 308
 309         memcpy(addr, sta->sta.addr, ETH_ALEN);
 310
 311         ibss_dbg(sdata, "Adding new IBSS station %pM\n", addr);
 312
 313         sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
 314         sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
 315         /* authorize the station only if the network is not RSN protected. If
 316          * not wait for the userspace to authorize it */
 317         if (!sta->sdata->u.ibss.control_port)
 318                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
 319
 320         rate_control_rate_init(sta);
 321
 322         /* If it fails, maybe we raced another insertion? */
 323         if (sta_info_insert_rcu(sta))
 324                 return sta_info_get(sdata, addr);
 325         return sta;
 326 }
 327
 328 static struct sta_info *
 329 ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, const u8 *bssid,
 330                        const u8 *addr, u32 supp_rates)
 331         __acquires(RCU)
 332 {
 333         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 334         struct ieee80211_local *local = sdata->local;
 335         struct sta_info *sta;
 336         struct ieee80211_chanctx_conf *chanctx_conf;
 337         struct ieee80211_supported_band *sband;
 338         int band;
 339
 340         /*
 341          * XXX: Consider removing the least recently used entry and
 342          *      allow new one to be added.
 343          */
 344         if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
 345                 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
 346                                     sdata->name, addr);
 347                 rcu_read_lock();
 348                 return NULL;
 349         }
 350
 351         if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) {
 352                 rcu_read_lock();
 353                 return NULL;
 354         }
 355
 356         if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) {
 357                 rcu_read_lock();
 358                 return NULL;
 359         }
 360
 361         rcu_read_lock();
 362         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 363         if (WARN_ON_ONCE(!chanctx_conf))
 364                 return NULL;
 365         band = chanctx_conf->def.chan->band;
 366         rcu_read_unlock();
 367
 368         sta = sta_info_alloc(sdata, addr, GFP_KERNEL);
 369         if (!sta) {
 370                 rcu_read_lock();
 371                 return NULL;
 372         }
 373
 374         sta->last_rx = jiffies;
 375
 376         /* make sure mandatory rates are always added */
 377         sband = local->hw.wiphy->bands[band];
 378         sta->sta.supp_rates[band] = supp_rates |
 379                         ieee80211_mandatory_rates(sband);
 380
 381         return ieee80211_ibss_finish_sta(sta);
 382 }
 383
 384 static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data *sdata,
 385                                           struct ieee80211_mgmt *mgmt,
 386                                           size_t len)
 387 {
 388         u16 reason = le16_to_cpu(mgmt->u.deauth.reason_code);
 389
 390         if (len < IEEE80211_DEAUTH_FRAME_LEN)
 391                 return;
 392
 393         ibss_dbg(sdata, "RX DeAuth SA=%pM DA=%pM BSSID=%pM (reason: %d)\n",
 394                  mgmt->sa, mgmt->da, mgmt->bssid, reason);
 395         sta_info_destroy_addr(sdata, mgmt->sa);
 396 }
 397
 398 static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata,
 399                                         struct ieee80211_mgmt *mgmt,
 400                                         size_t len)
 401 {
 402         u16 auth_alg, auth_transaction;
 403
 404         sdata_assert_lock(sdata);
 405
 406         if (len < 24 + 6)
 407                 return;
 408
 409         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
 410         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
 411
 412         ibss_dbg(sdata,
 413                  "RX Auth SA=%pM DA=%pM BSSID=%pM (auth_transaction=%d)\n",
 414                  mgmt->sa, mgmt->da, mgmt->bssid, auth_transaction);
 415
 416         if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
 417                 return;
 418
 419         /*
 420          * IEEE 802.11 standard does not require authentication in IBSS
 421          * networks and most implementations do not seem to use it.
 422          * However, try to reply to authentication attempts if someone
 423          * has actually implemented this.
 424          */
 425         ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, 0, NULL, 0,
 426                             mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0, 0);
 427 }
 428
 429 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
 430                                   struct ieee80211_mgmt *mgmt, size_t len,
 431                                   struct ieee80211_rx_status *rx_status,
 432                                   struct ieee802_11_elems *elems)
 433 {
 434         struct ieee80211_local *local = sdata->local;
 435         int freq;
 436         struct cfg80211_bss *cbss;
 437         struct ieee80211_bss *bss;
 438         struct sta_info *sta;
 439         struct ieee80211_channel *channel;
 440         u64 beacon_timestamp, rx_timestamp;
 441         u32 supp_rates = 0;
 442         enum ieee80211_band band = rx_status->band;
 443         struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band];
 444         bool rates_updated = false;
 445
 446         if (elems->ds_params)
 447                 freq = ieee80211_channel_to_frequency(elems->ds_params[0],
 448                                                       band);
 449         else
 450                 freq = rx_status->freq;
 451
 452         channel = ieee80211_get_channel(local->hw.wiphy, freq);
 453
 454         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
 455                 return;
 456
 457         if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
 458             ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid)) {
 459
 460                 rcu_read_lock();
 461                 sta = sta_info_get(sdata, mgmt->sa);
 462
 463                 if (elems->supp_rates) {
 464                         supp_rates = ieee80211_sta_get_rates(local, elems,
 465                                                              band, NULL);
 466                         if (sta) {
 467                                 u32 prev_rates;
 468
 469                                 prev_rates = sta->sta.supp_rates[band];
 470                                 /* make sure mandatory rates are always added */
 471                                 sta->sta.supp_rates[band] = supp_rates |
 472                                         ieee80211_mandatory_rates(sband);
 473
 474                                 if (sta->sta.supp_rates[band] != prev_rates) {
 475                                         ibss_dbg(sdata,
 476                                                  "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n",
 477                                                  sta->sta.addr, prev_rates,
 478                                                  sta->sta.supp_rates[band]);
 479                                         rates_updated = true;
 480                                 }
 481                         } else {
 482                                 rcu_read_unlock();
 483                                 sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid,
 484                                                 mgmt->sa, supp_rates);
 485                         }
 486                 }
 487
 488                 if (sta && elems->wmm_info)
 489                         set_sta_flag(sta, WLAN_STA_WME);
 490
 491                 if (sta && elems->ht_operation && elems->ht_cap_elem &&
 492                     sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20_NOHT &&
 493                     sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_5 &&
 494                     sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_10) {
 495                         /* we both use HT */
 496                         struct ieee80211_ht_cap htcap_ie;
 497                         struct cfg80211_chan_def chandef;
 498
 499                         ieee80211_ht_oper_to_chandef(channel,
 500                                                      elems->ht_operation,
 501                                                      &chandef);
 502
 503                         memcpy(&htcap_ie, elems->ht_cap_elem, sizeof(htcap_ie));
 504
 505                         /*
 506                          * fall back to HT20 if we don't use or use
 507                          * the other extension channel
 508                          */
 509                         if (chandef.center_freq1 !=
 510                             sdata->u.ibss.chandef.center_freq1)
 511                                 htcap_ie.cap_info &=
 512                                         cpu_to_le16(~IEEE80211_HT_CAP_SUP_WIDTH_20_40);
 513
 514                         rates_updated |= ieee80211_ht_cap_ie_to_sta_ht_cap(
 515                                                 sdata, sband, &htcap_ie, sta);
 516                 }
 517
 518                 if (sta && rates_updated) {
 519                         drv_sta_rc_update(local, sdata, &sta->sta,
 520                                           IEEE80211_RC_SUPP_RATES_CHANGED);
 521                         rate_control_rate_init(sta);
 522                 }
 523
 524                 rcu_read_unlock();
 525         }
 526
 527         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
 528                                         channel);
 529         if (!bss)
 530                 return;
 531
 532         cbss = container_of((void *)bss, struct cfg80211_bss, priv);
 533
 534         /* same for beacon and probe response */
 535         beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp);
 536
 537         /* check if we need to merge IBSS */
 538
 539         /* we use a fixed BSSID */
 540         if (sdata->u.ibss.fixed_bssid)
 541                 goto put_bss;
 542
 543         /* not an IBSS */
 544         if (!(cbss->capability & WLAN_CAPABILITY_IBSS))
 545                 goto put_bss;
 546
 547         /* different channel */
 548         if (sdata->u.ibss.fixed_channel &&
 549             sdata->u.ibss.chandef.chan != cbss->channel)
 550                 goto put_bss;
 551
 552         /* different SSID */
 553         if (elems->ssid_len != sdata->u.ibss.ssid_len ||
 554             memcmp(elems->ssid, sdata->u.ibss.ssid,
 555                                 sdata->u.ibss.ssid_len))
 556                 goto put_bss;
 557
 558         /* same BSSID */
 559         if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid))
 560                 goto put_bss;
 561
 562         if (ieee80211_have_rx_timestamp(rx_status)) {
 563                 /* time when timestamp field was received */
 564                 rx_timestamp =
 565                         ieee80211_calculate_rx_timestamp(local, rx_status,
 566                                                          len + FCS_LEN, 24);
 567         } else {
 568                 /*
 569                  * second best option: get current TSF
 570                  * (will return -1 if not supported)
 571                  */
 572                 rx_timestamp = drv_get_tsf(local, sdata);
 573         }
 574
 575         ibss_dbg(sdata,
 576                  "RX beacon SA=%pM BSSID=%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
 577                  mgmt->sa, mgmt->bssid,
 578                  (unsigned long long)rx_timestamp,
 579                  (unsigned long long)beacon_timestamp,
 580                  (unsigned long long)(rx_timestamp - beacon_timestamp),
 581                  jiffies);
 582
 583         if (beacon_timestamp > rx_timestamp) {
 584                 ibss_dbg(sdata,
 585                          "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n",
 586                          mgmt->bssid);
 587                 ieee80211_sta_join_ibss(sdata, bss);
 588                 supp_rates = ieee80211_sta_get_rates(local, elems, band, NULL);
 589                 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa,
 590                                        supp_rates);
 591                 rcu_read_unlock();
 592         }
 593
 594  put_bss:
 595         ieee80211_rx_bss_put(local, bss);
 596 }
 597
 598 void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata,
 599                               const u8 *bssid, const u8 *addr,
 600                               u32 supp_rates)
 601 {
 602         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 603         struct ieee80211_local *local = sdata->local;
 604         struct sta_info *sta;
 605         struct ieee80211_chanctx_conf *chanctx_conf;
 606         struct ieee80211_supported_band *sband;
 607         int band;
 608
 609         /*
 610          * XXX: Consider removing the least recently used entry and
 611          *      allow new one to be added.
 612          */
 613         if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
 614                 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
 615                                     sdata->name, addr);
 616                 return;
 617         }
 618
 619         if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH)
 620                 return;
 621
 622         if (!ether_addr_equal(bssid, sdata->u.ibss.bssid))
 623                 return;
 624
 625         rcu_read_lock();
 626         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 627         if (WARN_ON_ONCE(!chanctx_conf)) {
 628                 rcu_read_unlock();
 629                 return;
 630         }
 631         band = chanctx_conf->def.chan->band;
 632         rcu_read_unlock();
 633
 634         sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
 635         if (!sta)
 636                 return;
 637
 638         sta->last_rx = jiffies;
 639
 640         /* make sure mandatory rates are always added */
 641         sband = local->hw.wiphy->bands[band];
 642         sta->sta.supp_rates[band] = supp_rates |
 643                         ieee80211_mandatory_rates(sband);
 644
 645         spin_lock(&ifibss->incomplete_lock);
 646         list_add(&sta->list, &ifibss->incomplete_stations);
 647         spin_unlock(&ifibss->incomplete_lock);
 648         ieee80211_queue_work(&local->hw, &sdata->work);
 649 }
 650
 651 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
 652 {
 653         struct ieee80211_local *local = sdata->local;
 654         int active = 0;
 655         struct sta_info *sta;
 656
 657         sdata_assert_lock(sdata);
 658
 659         rcu_read_lock();
 660
 661         list_for_each_entry_rcu(sta, &local->sta_list, list) {
 662                 if (sta->sdata == sdata &&
 663                     time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
 664                                jiffies)) {
 665                         active++;
 666                         break;
 667                 }
 668         }
 669
 670         rcu_read_unlock();
 671
 672         return active;
 673 }
 674
 675 /*
 676  * This function is called with state == IEEE80211_IBSS_MLME_JOINED
 677  */
 678
 679 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
 680 {
 681         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 682
 683         sdata_assert_lock(sdata);
 684
 685         mod_timer(&ifibss->timer,
 686                   round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
 687
 688         ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT);
 689
 690         if (time_before(jiffies, ifibss->last_scan_completed +
 691                        IEEE80211_IBSS_MERGE_INTERVAL))
 692                 return;
 693
 694         if (ieee80211_sta_active_ibss(sdata))
 695                 return;
 696
 697         if (ifibss->fixed_channel)
 698                 return;
 699
 700         sdata_info(sdata,
 701                    "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n");
 702
 703         ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len,
 704                                     NULL);
 705 }
 706
 707 static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
 708 {
 709         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 710         u8 bssid[ETH_ALEN];
 711         u16 capability;
 712         int i;
 713
 714         sdata_assert_lock(sdata);
 715
 716         if (ifibss->fixed_bssid) {
 717                 memcpy(bssid, ifibss->bssid, ETH_ALEN);
 718         } else {
 719                 /* Generate random, not broadcast, locally administered BSSID. Mix in
 720                  * own MAC address to make sure that devices that do not have proper
 721                  * random number generator get different BSSID. */
 722                 get_random_bytes(bssid, ETH_ALEN);
 723                 for (i = 0; i < ETH_ALEN; i++)
 724                         bssid[i] ^= sdata->vif.addr[i];
 725                 bssid[0] &= ~0x01;
 726                 bssid[0] |= 0x02;
 727         }
 728
 729         sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid);
 730
 731         capability = WLAN_CAPABILITY_IBSS;
 732
 733         if (ifibss->privacy)
 734                 capability |= WLAN_CAPABILITY_PRIVACY;
 735         else
 736                 sdata->drop_unencrypted = 0;
 737
 738         __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int,
 739                                   ifibss->chandef.chan, ifibss->basic_rates,
 740                                   capability, 0, true);
 741 }
 742
 743 /*
 744  * This function is called with state == IEEE80211_IBSS_MLME_SEARCH
 745  */
 746
 747 static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
 748 {
 749         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 750         struct ieee80211_local *local = sdata->local;
 751         struct cfg80211_bss *cbss;
 752         struct ieee80211_channel *chan = NULL;
 753         const u8 *bssid = NULL;
 754         int active_ibss;
 755         u16 capability;
 756
 757         sdata_assert_lock(sdata);
 758
 759         active_ibss = ieee80211_sta_active_ibss(sdata);
 760         ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss);
 761
 762         if (active_ibss)
 763                 return;
 764
 765         capability = WLAN_CAPABILITY_IBSS;
 766         if (ifibss->privacy)
 767                 capability |= WLAN_CAPABILITY_PRIVACY;
 768         if (ifibss->fixed_bssid)
 769                 bssid = ifibss->bssid;
 770         if (ifibss->fixed_channel)
 771                 chan = ifibss->chandef.chan;
 772         if (!is_zero_ether_addr(ifibss->bssid))
 773                 bssid = ifibss->bssid;
 774         cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid,
 775                                 ifibss->ssid, ifibss->ssid_len,
 776                                 WLAN_CAPABILITY_IBSS | WLAN_CAPABILITY_PRIVACY,
 777                                 capability);
 778
 779         if (cbss) {
 780                 struct ieee80211_bss *bss;
 781
 782                 bss = (void *)cbss->priv;
 783                 ibss_dbg(sdata,
 784                          "sta_find_ibss: selected %pM current %pM\n",
 785                          cbss->bssid, ifibss->bssid);
 786                 sdata_info(sdata,
 787                            "Selected IBSS BSSID %pM based on configured SSID\n",
 788                            cbss->bssid);
 789
 790                 ieee80211_sta_join_ibss(sdata, bss);
 791                 ieee80211_rx_bss_put(local, bss);
 792                 return;
 793         }
 794
 795         ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n");
 796
 797         /* Selected IBSS not found in current scan results - try to scan */
 798         if (time_after(jiffies, ifibss->last_scan_completed +
 799                                         IEEE80211_SCAN_INTERVAL)) {
 800                 sdata_info(sdata, "Trigger new scan to find an IBSS to join\n");
 801
 802                 ieee80211_request_ibss_scan(sdata, ifibss->ssid,
 803                                             ifibss->ssid_len, chan);
 804         } else {
 805                 int interval = IEEE80211_SCAN_INTERVAL;
 806
 807                 if (time_after(jiffies, ifibss->ibss_join_req +
 808                                IEEE80211_IBSS_JOIN_TIMEOUT))
 809                         ieee80211_sta_create_ibss(sdata);
 810
 811                 mod_timer(&ifibss->timer,
 812                           round_jiffies(jiffies + interval));
 813         }
 814 }
 815
 816 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
 817                                         struct sk_buff *req)
 818 {
 819         struct ieee80211_mgmt *mgmt = (void *)req->data;
 820         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 821         struct ieee80211_local *local = sdata->local;
 822         int tx_last_beacon, len = req->len;
 823         struct sk_buff *skb;
 824         struct beacon_data *presp;
 825         u8 *pos, *end;
 826
 827         sdata_assert_lock(sdata);
 828
 829         presp = rcu_dereference_protected(ifibss->presp,
 830                                           lockdep_is_held(&sdata->wdev.mtx));
 831
 832         if (ifibss->state != IEEE80211_IBSS_MLME_JOINED ||
 833             len < 24 + 2 || !presp)
 834                 return;
 835
 836         tx_last_beacon = drv_tx_last_beacon(local);
 837
 838         ibss_dbg(sdata,
 839                  "RX ProbeReq SA=%pM DA=%pM BSSID=%pM (tx_last_beacon=%d)\n",
 840                  mgmt->sa, mgmt->da, mgmt->bssid, tx_last_beacon);
 841
 842         if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da))
 843                 return;
 844
 845         if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) &&
 846             !is_broadcast_ether_addr(mgmt->bssid))
 847                 return;
 848
 849         end = ((u8 *) mgmt) + len;
 850         pos = mgmt->u.probe_req.variable;
 851         if (pos[0] != WLAN_EID_SSID ||
 852             pos + 2 + pos[1] > end) {
 853                 ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n",
 854                          mgmt->sa);
 855                 return;
 856         }
 857         if (pos[1] != 0 &&
 858             (pos[1] != ifibss->ssid_len ||
 859              memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) {
 860                 /* Ignore ProbeReq for foreign SSID */
 861                 return;
 862         }
 863
 864         /* Reply with ProbeResp */
 865         skb = dev_alloc_skb(local->tx_headroom + presp->head_len);
 866         if (!skb)
 867                 return;
 868
 869         skb_reserve(skb, local->tx_headroom);
 870         memcpy(skb_put(skb, presp->head_len), presp->head, presp->head_len);
 871
 872         memcpy(((struct ieee80211_mgmt *) skb->data)->da, mgmt->sa, ETH_ALEN);
 873         ibss_dbg(sdata, "Sending ProbeResp to %pM\n", mgmt->sa);
 874         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 875         ieee80211_tx_skb(sdata, skb);
 876 }
 877
 878 static
 879 void ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data *sdata,
 880                                     struct ieee80211_mgmt *mgmt, size_t len,
 881                                     struct ieee80211_rx_status *rx_status)
 882 {
 883         size_t baselen;
 884         struct ieee802_11_elems elems;
 885
 886         BUILD_BUG_ON(offsetof(typeof(mgmt->u.probe_resp), variable) !=
 887                      offsetof(typeof(mgmt->u.beacon), variable));
 888
 889         /*
 890          * either beacon or probe_resp but the variable field is at the
 891          * same offset
 892          */
 893         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
 894         if (baselen > len)
 895                 return;
 896
 897         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
 898                                false, &elems);
 899
 900         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
 901 }
 902
 903 void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
 904                                    struct sk_buff *skb)
 905 {
 906         struct ieee80211_rx_status *rx_status;
 907         struct ieee80211_mgmt *mgmt;
 908         u16 fc;
 909
 910         rx_status = IEEE80211_SKB_RXCB(skb);
 911         mgmt = (struct ieee80211_mgmt *) skb->data;
 912         fc = le16_to_cpu(mgmt->frame_control);
 913
 914         sdata_lock(sdata);
 915
 916         if (!sdata->u.ibss.ssid_len)
 917                 goto mgmt_out; /* not ready to merge yet */
 918
 919         switch (fc & IEEE80211_FCTL_STYPE) {
 920         case IEEE80211_STYPE_PROBE_REQ:
 921                 ieee80211_rx_mgmt_probe_req(sdata, skb);
 922                 break;
 923         case IEEE80211_STYPE_PROBE_RESP:
 924         case IEEE80211_STYPE_BEACON:
 925                 ieee80211_rx_mgmt_probe_beacon(sdata, mgmt, skb->len,
 926                                                rx_status);
 927                 break;
 928         case IEEE80211_STYPE_AUTH:
 929                 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len);
 930                 break;
 931         case IEEE80211_STYPE_DEAUTH:
 932                 ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len);
 933                 break;
 934         }
 935
 936  mgmt_out:
 937         sdata_unlock(sdata);
 938 }
 939
 940 void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata)
 941 {
 942         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 943         struct sta_info *sta;
 944
 945         sdata_lock(sdata);
 946
 947         /*
 948          * Work could be scheduled after scan or similar
 949          * when we aren't even joined (or trying) with a
 950          * network.
 951          */
 952         if (!ifibss->ssid_len)
 953                 goto out;
 954
 955         spin_lock_bh(&ifibss->incomplete_lock);
 956         while (!list_empty(&ifibss->incomplete_stations)) {
 957                 sta = list_first_entry(&ifibss->incomplete_stations,
 958                                        struct sta_info, list);
 959                 list_del(&sta->list);
 960                 spin_unlock_bh(&ifibss->incomplete_lock);
 961
 962                 ieee80211_ibss_finish_sta(sta);
 963                 rcu_read_unlock();
 964                 spin_lock_bh(&ifibss->incomplete_lock);
 965         }
 966         spin_unlock_bh(&ifibss->incomplete_lock);
 967
 968         switch (ifibss->state) {
 969         case IEEE80211_IBSS_MLME_SEARCH:
 970                 ieee80211_sta_find_ibss(sdata);
 971                 break;
 972         case IEEE80211_IBSS_MLME_JOINED:
 973                 ieee80211_sta_merge_ibss(sdata);
 974                 break;
 975         default:
 976                 WARN_ON(1);
 977                 break;
 978         }
 979
 980  out:
 981         sdata_unlock(sdata);
 982 }
 983
 984 static void ieee80211_ibss_timer(unsigned long data)
 985 {
 986         struct ieee80211_sub_if_data *sdata =
 987                 (struct ieee80211_sub_if_data *) data;
 988
 989         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
 990 }
 991
 992 void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata)
 993 {
 994         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 995
 996         setup_timer(&ifibss->timer, ieee80211_ibss_timer,
 997                     (unsigned long) sdata);
 998         INIT_LIST_HEAD(&ifibss->incomplete_stations);
 999         spin_lock_init(&ifibss->incomplete_lock);
1000 }
1001
1002 /* scan finished notification */
1003 void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local)
1004 {
1005         struct ieee80211_sub_if_data *sdata;
1006
1007         mutex_lock(&local->iflist_mtx);
1008         list_for_each_entry(sdata, &local->interfaces, list) {
1009                 if (!ieee80211_sdata_running(sdata))
1010                         continue;
1011                 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
1012                         continue;
1013                 sdata->u.ibss.last_scan_completed = jiffies;
1014                 ieee80211_queue_work(&local->hw, &sdata->work);
1015         }
1016         mutex_unlock(&local->iflist_mtx);
1017 }
1018
1019 int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
1020                         struct cfg80211_ibss_params *params)
1021 {
1022         u32 changed = 0;
1023
1024         if (params->bssid) {
1025                 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN);
1026                 sdata->u.ibss.fixed_bssid = true;
1027         } else
1028                 sdata->u.ibss.fixed_bssid = false;
1029
1030         sdata->u.ibss.privacy = params->privacy;
1031         sdata->u.ibss.control_port = params->control_port;
1032         sdata->u.ibss.basic_rates = params->basic_rates;
1033         memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate,
1034                sizeof(params->mcast_rate));
1035
1036         sdata->vif.bss_conf.beacon_int = params->beacon_interval;
1037
1038         sdata->u.ibss.chandef = params->chandef;
1039         sdata->u.ibss.fixed_channel = params->channel_fixed;
1040
1041         if (params->ie) {
1042                 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len,
1043                                            GFP_KERNEL);
1044                 if (sdata->u.ibss.ie)
1045                         sdata->u.ibss.ie_len = params->ie_len;
1046         }
1047
1048         sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
1049         sdata->u.ibss.ibss_join_req = jiffies;
1050
1051         memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len);
1052         sdata->u.ibss.ssid_len = params->ssid_len;
1053
1054         /*
1055          * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is
1056          * reserved, but an HT STA shall protect HT transmissions as though
1057          * the HT Protection field were set to non-HT mixed mode.
1058          *
1059          * In an IBSS, the RIFS Mode field of the HT Operation element is
1060          * also reserved, but an HT STA shall operate as though this field
1061          * were set to 1.
1062          */
1063
1064         sdata->vif.bss_conf.ht_operation_mode |=
1065                   IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED
1066                 | IEEE80211_HT_PARAM_RIFS_MODE;
1067
1068         changed |= BSS_CHANGED_HT;
1069         ieee80211_bss_info_change_notify(sdata, changed);
1070
1071         sdata->smps_mode = IEEE80211_SMPS_OFF;
1072         sdata->needed_rx_chains = sdata->local->rx_chains;
1073
1074         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1075
1076         return 0;
1077 }
1078
1079 int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata)
1080 {
1081         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1082         struct ieee80211_local *local = sdata->local;
1083         struct cfg80211_bss *cbss;
1084         u16 capability;
1085         int active_ibss;
1086         struct sta_info *sta;
1087         struct beacon_data *presp;
1088
1089         active_ibss = ieee80211_sta_active_ibss(sdata);
1090
1091         if (!active_ibss && !is_zero_ether_addr(ifibss->bssid)) {
1092                 capability = WLAN_CAPABILITY_IBSS;
1093
1094                 if (ifibss->privacy)
1095                         capability |= WLAN_CAPABILITY_PRIVACY;
1096
1097                 cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->chandef.chan,
1098                                         ifibss->bssid, ifibss->ssid,
1099                                         ifibss->ssid_len, WLAN_CAPABILITY_IBSS |
1100                                         WLAN_CAPABILITY_PRIVACY,
1101                                         capability);
1102
1103                 if (cbss) {
1104                         cfg80211_unlink_bss(local->hw.wiphy, cbss);
1105                         cfg80211_put_bss(local->hw.wiphy, cbss);
1106                 }
1107         }
1108
1109         ifibss->state = IEEE80211_IBSS_MLME_SEARCH;
1110         memset(ifibss->bssid, 0, ETH_ALEN);
1111         ifibss->ssid_len = 0;
1112
1113         sta_info_flush(sdata);
1114
1115         spin_lock_bh(&ifibss->incomplete_lock);
1116         while (!list_empty(&ifibss->incomplete_stations)) {
1117                 sta = list_first_entry(&ifibss->incomplete_stations,
1118                                        struct sta_info, list);
1119                 list_del(&sta->list);
1120                 spin_unlock_bh(&ifibss->incomplete_lock);
1121
1122                 sta_info_free(local, sta);
1123                 spin_lock_bh(&ifibss->incomplete_lock);
1124         }
1125         spin_unlock_bh(&ifibss->incomplete_lock);
1126
1127         netif_carrier_off(sdata->dev);
1128
1129         /* remove beacon */
1130         kfree(sdata->u.ibss.ie);
1131         presp = rcu_dereference_protected(ifibss->presp,
1132                                           lockdep_is_held(&sdata->wdev.mtx));
1133         RCU_INIT_POINTER(sdata->u.ibss.presp, NULL);
1134         sdata->vif.bss_conf.ibss_joined = false;
1135         sdata->vif.bss_conf.ibss_creator = false;
1136         sdata->vif.bss_conf.enable_beacon = false;
1137         sdata->vif.bss_conf.ssid_len = 0;
1138         clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state);
1139         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED |
1140                                                 BSS_CHANGED_IBSS);
1141         synchronize_rcu();
1142         kfree(presp);
1143
1144         skb_queue_purge(&sdata->skb_queue);
1145
1146         del_timer_sync(&sdata->u.ibss.timer);
1147
1148         return 0;
1149 }