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_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
  38 static 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 (channel_type > NL80211_CHAN_HT20 &&
  86             !cfg80211_can_beacon_sec_chan(local->hw.wiphy, chan, channel_type))
  87                 channel_type = NL80211_CHAN_HT20;
  88         if (!ieee80211_set_channel_type(local, sdata, channel_type)) {
  89                 /* can only fail due to HT40+/- mismatch */
  90                 channel_type = NL80211_CHAN_HT20;
  91                 WARN_ON(!ieee80211_set_channel_type(local, sdata,
  92                                                     NL80211_CHAN_HT20));
  93         }
  94         ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
  95
  96         sband = local->hw.wiphy->bands[chan->band];
  97
  98         /* build supported rates array */
  99         pos = supp_rates;
 100         for (i = 0; i < sband->n_bitrates; i++) {
 101                 int rate = sband->bitrates[i].bitrate;
 102                 u8 basic = 0;
 103                 if (basic_rates & BIT(i))
 104                         basic = 0x80;
 105                 *pos++ = basic | (u8) (rate / 5);
 106         }
 107
 108         /* Build IBSS probe response */
 109         mgmt = (void *) skb_put(skb, 24 + sizeof(mgmt->u.beacon));
 110         memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
 111         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 112                                           IEEE80211_STYPE_PROBE_RESP);
 113         memset(mgmt->da, 0xff, ETH_ALEN);
 114         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 115         memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN);
 116         mgmt->u.beacon.beacon_int = cpu_to_le16(beacon_int);
 117         mgmt->u.beacon.timestamp = cpu_to_le64(tsf);
 118         mgmt->u.beacon.capab_info = cpu_to_le16(capability);
 119
 120         pos = skb_put(skb, 2 + ifibss->ssid_len);
 121         *pos++ = WLAN_EID_SSID;
 122         *pos++ = ifibss->ssid_len;
 123         memcpy(pos, ifibss->ssid, ifibss->ssid_len);
 124
 125         rates = sband->n_bitrates;
 126         if (rates > 8)
 127                 rates = 8;
 128         pos = skb_put(skb, 2 + rates);
 129         *pos++ = WLAN_EID_SUPP_RATES;
 130         *pos++ = rates;
 131         memcpy(pos, supp_rates, rates);
 132
 133         if (sband->band == IEEE80211_BAND_2GHZ) {
 134                 pos = skb_put(skb, 2 + 1);
 135                 *pos++ = WLAN_EID_DS_PARAMS;
 136                 *pos++ = 1;
 137                 *pos++ = ieee80211_frequency_to_channel(chan->center_freq);
 138         }
 139
 140         pos = skb_put(skb, 2 + 2);
 141         *pos++ = WLAN_EID_IBSS_PARAMS;
 142         *pos++ = 2;
 143         /* FIX: set ATIM window based on scan results */
 144         *pos++ = 0;
 145         *pos++ = 0;
 146
 147         if (sband->n_bitrates > 8) {
 148                 rates = sband->n_bitrates - 8;
 149                 pos = skb_put(skb, 2 + rates);
 150                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 151                 *pos++ = rates;
 152                 memcpy(pos, &supp_rates[8], rates);
 153         }
 154
 155         if (ifibss->ie_len)
 156                 memcpy(skb_put(skb, ifibss->ie_len),
 157                        ifibss->ie, ifibss->ie_len);
 158
 159         /* add HT capability and information IEs */
 160         if (channel_type && sband->ht_cap.ht_supported) {
 161                 pos = skb_put(skb, 4 +
 162                                    sizeof(struct ieee80211_ht_cap) +
 163                                    sizeof(struct ieee80211_ht_operation));
 164                 pos = ieee80211_ie_build_ht_cap(pos, &sband->ht_cap,
 165                                                 sband->ht_cap.cap);
 166                 pos = ieee80211_ie_build_ht_oper(pos, &sband->ht_cap,
 167                                                  chan, channel_type, 0);
 168         }
 169
 170         if (local->hw.queues >= IEEE80211_NUM_ACS) {
 171                 pos = skb_put(skb, 9);
 172                 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
 173                 *pos++ = 7; /* len */
 174                 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
 175                 *pos++ = 0x50;
 176                 *pos++ = 0xf2;
 177                 *pos++ = 2; /* WME */
 178                 *pos++ = 0; /* WME info */
 179                 *pos++ = 1; /* WME ver */
 180                 *pos++ = 0; /* U-APSD no in use */
 181         }
 182
 183         rcu_assign_pointer(ifibss->presp, skb);
 184
 185         sdata->vif.bss_conf.beacon_int = beacon_int;
 186         sdata->vif.bss_conf.basic_rates = basic_rates;
 187         bss_change = BSS_CHANGED_BEACON_INT;
 188         bss_change |= ieee80211_reset_erp_info(sdata);
 189         bss_change |= BSS_CHANGED_BSSID;
 190         bss_change |= BSS_CHANGED_BEACON;
 191         bss_change |= BSS_CHANGED_BEACON_ENABLED;
 192         bss_change |= BSS_CHANGED_BASIC_RATES;
 193         bss_change |= BSS_CHANGED_HT;
 194         bss_change |= BSS_CHANGED_IBSS;
 195         sdata->vif.bss_conf.ibss_joined = true;
 196         ieee80211_bss_info_change_notify(sdata, bss_change);
 197
 198         ieee80211_sta_def_wmm_params(sdata, sband->n_bitrates, supp_rates);
 199
 200         ifibss->state = IEEE80211_IBSS_MLME_JOINED;
 201         mod_timer(&ifibss->timer,
 202                   round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
 203
 204         bss = cfg80211_inform_bss_frame(local->hw.wiphy, local->hw.conf.channel,
 205                                         mgmt, skb->len, 0, GFP_KERNEL);
 206         cfg80211_put_bss(bss);
 207         netif_carrier_on(sdata->dev);
 208         cfg80211_ibss_joined(sdata->dev, ifibss->bssid, GFP_KERNEL);
 209 }
 210
 211 static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
 212                                     struct ieee80211_bss *bss)
 213 {
 214         struct cfg80211_bss *cbss =
 215                 container_of((void *)bss, struct cfg80211_bss, priv);
 216         struct ieee80211_supported_band *sband;
 217         u32 basic_rates;
 218         int i, j;
 219         u16 beacon_int = cbss->beacon_interval;
 220
 221         lockdep_assert_held(&sdata->u.ibss.mtx);
 222
 223         if (beacon_int < 10)
 224                 beacon_int = 10;
 225
 226         sband = sdata->local->hw.wiphy->bands[cbss->channel->band];
 227
 228         basic_rates = 0;
 229
 230         for (i = 0; i < bss->supp_rates_len; i++) {
 231                 int rate = (bss->supp_rates[i] & 0x7f) * 5;
 232                 bool is_basic = !!(bss->supp_rates[i] & 0x80);
 233
 234                 for (j = 0; j < sband->n_bitrates; j++) {
 235                         if (sband->bitrates[j].bitrate == rate) {
 236                                 if (is_basic)
 237                                         basic_rates |= BIT(j);
 238                                 break;
 239                         }
 240                 }
 241         }
 242
 243         __ieee80211_sta_join_ibss(sdata, cbss->bssid,
 244                                   beacon_int,
 245                                   cbss->channel,
 246                                   basic_rates,
 247                                   cbss->capability,
 248                                   cbss->tsf);
 249 }
 250
 251 static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta,
 252                                                   bool auth)
 253         __acquires(RCU)
 254 {
 255         struct ieee80211_sub_if_data *sdata = sta->sdata;
 256         u8 addr[ETH_ALEN];
 257
 258         memcpy(addr, sta->sta.addr, ETH_ALEN);
 259
 260 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 261         wiphy_debug(sdata->local->hw.wiphy,
 262                     "Adding new IBSS station %pM (dev=%s)\n",
 263                     addr, sdata->name);
 264 #endif
 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) {
 279 #ifdef CONFIG_MAC80211_IBSS_DEBUG
 280                 printk(KERN_DEBUG "TX Auth SA=%pM DA=%pM BSSID=%pM"
 281                        "(auth_transaction=1)\n", sdata->vif.addr,
 282                        sdata->u.ibss.bssid, addr);
 283 #endif
 284                 ieee80211_send_auth(sdata, 1, WLAN_AUTH_OPEN, NULL, 0,
 285                                     addr, sdata->u.ibss.bssid, NULL, 0, 0);
 286         }
 287         return sta;
 288 }
 289
 290 static struct sta_info *
 291 ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata,
 292                        const u8 *bssid, const u8 *addr,
 293                        u32 supp_rates, bool auth)
 294         __acquires(RCU)
 295 {
 296         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 297         struct ieee80211_local *local = sdata->local;
 298         struct sta_info *sta;
 299         int band = local->hw.conf.channel->band;
 300
 301         /*
 302          * XXX: Consider removing the least recently used entry and
 303          *      allow new one to be added.
 304          */
 305         if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
 306                 net_dbg_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
 307                                     sdata->name, addr);
 308                 rcu_read_lock();
 309                 return NULL;
 310         }
 311
 312         if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) {
 313                 rcu_read_lock();
 314                 return NULL;
 315         }
 316
 317         if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) {
 318                 rcu_read_lock();
 319                 return NULL;
 320         }
 321
 322         sta = sta_info_alloc(sdata, addr, GFP_KERNEL);
 323         if (!sta) {
 324                 rcu_read_lock();
 325                 return NULL;
 326         }
 327
 328         sta->last_rx = jiffies;
 329
 330         /* make sure mandatory rates are always added */
 331         sta->sta.supp_rates[band] = supp_rates |
 332                         ieee80211_mandatory_rates(local, band);
 333
 334         return ieee80211_ibss_finish_sta(sta, auth);
 335 }
 336
 337 static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata,
 338                                         struct ieee80211_mgmt *mgmt,
 339                                         size_t len)
 340 {
 341         u16 auth_alg, auth_transaction;
 342
 343         lockdep_assert_held(&sdata->u.ibss.mtx);
 344
 345         if (len < 24 + 6)
 346                 return;
 347
 348         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
 349         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
 350
 351         if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
 352                 return;
 353 #ifdef CONFIG_MAC80211_IBSS_DEBUG
 354         printk(KERN_DEBUG "%s: RX Auth SA=%pM DA=%pM BSSID=%pM."
 355                "(auth_transaction=%d)\n",
 356                sdata->name, mgmt->sa, mgmt->da, mgmt->bssid, auth_transaction);
 357 #endif
 358         sta_info_destroy_addr(sdata, mgmt->sa);
 359         ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, 0, false);
 360         rcu_read_unlock();
 361
 362         /*
 363          * IEEE 802.11 standard does not require authentication in IBSS
 364          * networks and most implementations do not seem to use it.
 365          * However, try to reply to authentication attempts if someone
 366          * has actually implemented this.
 367          */
 368         ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, NULL, 0,
 369                             mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0);
 370 }
 371
 372 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
 373                                   struct ieee80211_mgmt *mgmt,
 374                                   size_t len,
 375                                   struct ieee80211_rx_status *rx_status,
 376                                   struct ieee802_11_elems *elems,
 377                                   bool beacon)
 378 {
 379         struct ieee80211_local *local = sdata->local;
 380         int freq;
 381         struct cfg80211_bss *cbss;
 382         struct ieee80211_bss *bss;
 383         struct sta_info *sta;
 384         struct ieee80211_channel *channel;
 385         u64 beacon_timestamp, rx_timestamp;
 386         u32 supp_rates = 0;
 387         enum ieee80211_band band = rx_status->band;
 388         struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band];
 389         bool rates_updated = false;
 390
 391         if (elems->ds_params && elems->ds_params_len == 1)
 392                 freq = ieee80211_channel_to_frequency(elems->ds_params[0],
 393                                                       band);
 394         else
 395                 freq = rx_status->freq;
 396
 397         channel = ieee80211_get_channel(local->hw.wiphy, freq);
 398
 399         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
 400                 return;
 401
 402         if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
 403             ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid)) {
 404
 405                 rcu_read_lock();
 406                 sta = sta_info_get(sdata, mgmt->sa);
 407
 408                 if (elems->supp_rates) {
 409                         supp_rates = ieee80211_sta_get_rates(local, elems,
 410                                                              band, NULL);
 411                         if (sta) {
 412                                 u32 prev_rates;
 413
 414                                 prev_rates = sta->sta.supp_rates[band];
 415                                 /* make sure mandatory rates are always added */
 416                                 sta->sta.supp_rates[band] = supp_rates |
 417                                         ieee80211_mandatory_rates(local, band);
 418
 419                                 if (sta->sta.supp_rates[band] != prev_rates) {
 420 #ifdef CONFIG_MAC80211_IBSS_DEBUG
 421                                         printk(KERN_DEBUG
 422                                                 "%s: updated supp_rates set "
 423                                                 "for %pM based on beacon"
 424                                                 "/probe_resp (0x%x -> 0x%x)\n",
 425                                                 sdata->name, sta->sta.addr,
 426                                                 prev_rates,
 427                                                 sta->sta.supp_rates[band]);
 428 #endif
 429                                         rates_updated = true;
 430                                 }
 431                         } else {
 432                                 rcu_read_unlock();
 433                                 sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid,
 434                                                 mgmt->sa, supp_rates, true);
 435                         }
 436                 }
 437
 438                 if (sta && elems->wmm_info)
 439                         set_sta_flag(sta, WLAN_STA_WME);
 440
 441                 if (sta && elems->ht_operation && elems->ht_cap_elem &&
 442                     sdata->u.ibss.channel_type != NL80211_CHAN_NO_HT) {
 443                         /* we both use HT */
 444                         struct ieee80211_sta_ht_cap sta_ht_cap_new;
 445                         enum nl80211_channel_type channel_type =
 446                                 ieee80211_ht_oper_to_channel_type(
 447                                                         elems->ht_operation);
 448
 449                         ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
 450                                                           elems->ht_cap_elem,
 451                                                           &sta_ht_cap_new);
 452
 453                         /*
 454                          * fall back to HT20 if we don't use or use
 455                          * the other extension channel
 456                          */
 457                         if (!(channel_type == NL80211_CHAN_HT40MINUS ||
 458                               channel_type == NL80211_CHAN_HT40PLUS) ||
 459                             channel_type != sdata->u.ibss.channel_type)
 460                                 sta_ht_cap_new.cap &=
 461                                         ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 462
 463                         if (memcmp(&sta->sta.ht_cap, &sta_ht_cap_new,
 464                                    sizeof(sta_ht_cap_new))) {
 465                                 memcpy(&sta->sta.ht_cap, &sta_ht_cap_new,
 466                                        sizeof(sta_ht_cap_new));
 467                                 rates_updated = true;
 468                         }
 469                 }
 470
 471                 if (sta && rates_updated)
 472                         rate_control_rate_init(sta);
 473
 474                 rcu_read_unlock();
 475         }
 476
 477         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
 478                                         channel, beacon);
 479         if (!bss)
 480                 return;
 481
 482         cbss = container_of((void *)bss, struct cfg80211_bss, priv);
 483
 484         /* was just updated in ieee80211_bss_info_update */
 485         beacon_timestamp = cbss->tsf;
 486
 487         /* check if we need to merge IBSS */
 488
 489         /* we use a fixed BSSID */
 490         if (sdata->u.ibss.fixed_bssid)
 491                 goto put_bss;
 492
 493         /* not an IBSS */
 494         if (!(cbss->capability & WLAN_CAPABILITY_IBSS))
 495                 goto put_bss;
 496
 497         /* different channel */
 498         if (cbss->channel != local->oper_channel)
 499                 goto put_bss;
 500
 501         /* different SSID */
 502         if (elems->ssid_len != sdata->u.ibss.ssid_len ||
 503             memcmp(elems->ssid, sdata->u.ibss.ssid,
 504                                 sdata->u.ibss.ssid_len))
 505                 goto put_bss;
 506
 507         /* same BSSID */
 508         if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid))
 509                 goto put_bss;
 510
 511         if (rx_status->flag & RX_FLAG_MACTIME_MPDU) {
 512                 /*
 513                  * For correct IBSS merging we need mactime; since mactime is
 514                  * defined as the time the first data symbol of the frame hits
 515                  * the PHY, and the timestamp of the beacon is defined as "the
 516                  * time that the data symbol containing the first bit of the
 517                  * timestamp is transmitted to the PHY plus the transmitting
 518                  * STA's delays through its local PHY from the MAC-PHY
 519                  * interface to its interface with the WM" (802.11 11.1.2)
 520                  * - equals the time this bit arrives at the receiver - we have
 521                  * to take into account the offset between the two.
 522                  *
 523                  * E.g. at 1 MBit that means mactime is 192 usec earlier
 524                  * (=24 bytes * 8 usecs/byte) than the beacon timestamp.
 525                  */
 526                 int rate;
 527
 528                 if (rx_status->flag & RX_FLAG_HT)
 529                         rate = 65; /* TODO: HT rates */
 530                 else
 531                         rate = local->hw.wiphy->bands[band]->
 532                                 bitrates[rx_status->rate_idx].bitrate;
 533
 534                 rx_timestamp = rx_status->mactime + (24 * 8 * 10 / rate);
 535         } else {
 536                 /*
 537                  * second best option: get current TSF
 538                  * (will return -1 if not supported)
 539                  */
 540                 rx_timestamp = drv_get_tsf(local, sdata);
 541         }
 542
 543 #ifdef CONFIG_MAC80211_IBSS_DEBUG
 544         printk(KERN_DEBUG "RX beacon SA=%pM BSSID="
 545                "%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
 546                mgmt->sa, mgmt->bssid,
 547                (unsigned long long)rx_timestamp,
 548                (unsigned long long)beacon_timestamp,
 549                (unsigned long long)(rx_timestamp - beacon_timestamp),
 550                jiffies);
 551 #endif
 552
 553         if (beacon_timestamp > rx_timestamp) {
 554 #ifdef CONFIG_MAC80211_IBSS_DEBUG
 555                 printk(KERN_DEBUG "%s: beacon TSF higher than "
 556                        "local TSF - IBSS merge with BSSID %pM\n",
 557                        sdata->name, mgmt->bssid);
 558 #endif
 559                 ieee80211_sta_join_ibss(sdata, bss);
 560                 supp_rates = ieee80211_sta_get_rates(local, elems, band, NULL);
 561                 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa,
 562                                        supp_rates, true);
 563                 rcu_read_unlock();
 564         }
 565
 566  put_bss:
 567         ieee80211_rx_bss_put(local, bss);
 568 }
 569
 570 void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata,
 571                               const u8 *bssid, const u8 *addr,
 572                               u32 supp_rates)
 573 {
 574         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 575         struct ieee80211_local *local = sdata->local;
 576         struct sta_info *sta;
 577         int band = local->hw.conf.channel->band;
 578
 579         /*
 580          * XXX: Consider removing the least recently used entry and
 581          *      allow new one to be added.
 582          */
 583         if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
 584                 net_dbg_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
 585                                     sdata->name, addr);
 586                 return;
 587         }
 588
 589         if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH)
 590                 return;
 591
 592         if (!ether_addr_equal(bssid, sdata->u.ibss.bssid))
 593                 return;
 594
 595         sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
 596         if (!sta)
 597                 return;
 598
 599         sta->last_rx = jiffies;
 600
 601         /* make sure mandatory rates are always added */
 602         sta->sta.supp_rates[band] = supp_rates |
 603                         ieee80211_mandatory_rates(local, band);
 604
 605         spin_lock(&ifibss->incomplete_lock);
 606         list_add(&sta->list, &ifibss->incomplete_stations);
 607         spin_unlock(&ifibss->incomplete_lock);
 608         ieee80211_queue_work(&local->hw, &sdata->work);
 609 }
 610
 611 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
 612 {
 613         struct ieee80211_local *local = sdata->local;
 614         int active = 0;
 615         struct sta_info *sta;
 616
 617         lockdep_assert_held(&sdata->u.ibss.mtx);
 618
 619         rcu_read_lock();
 620
 621         list_for_each_entry_rcu(sta, &local->sta_list, list) {
 622                 if (sta->sdata == sdata &&
 623                     time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
 624                                jiffies)) {
 625                         active++;
 626                         break;
 627                 }
 628         }
 629
 630         rcu_read_unlock();
 631
 632         return active;
 633 }
 634
 635 /*
 636  * This function is called with state == IEEE80211_IBSS_MLME_JOINED
 637  */
 638
 639 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
 640 {
 641         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 642
 643         lockdep_assert_held(&ifibss->mtx);
 644
 645         mod_timer(&ifibss->timer,
 646                   round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
 647
 648         ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT);
 649
 650         if (time_before(jiffies, ifibss->last_scan_completed +
 651                        IEEE80211_IBSS_MERGE_INTERVAL))
 652                 return;
 653
 654         if (ieee80211_sta_active_ibss(sdata))
 655                 return;
 656
 657         if (ifibss->fixed_channel)
 658                 return;
 659
 660         printk(KERN_DEBUG "%s: No active IBSS STAs - trying to scan for other "
 661                "IBSS networks with same SSID (merge)\n", sdata->name);
 662
 663         ieee80211_request_internal_scan(sdata,
 664                         ifibss->ssid, ifibss->ssid_len, NULL);
 665 }
 666
 667 static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
 668 {
 669         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 670         u8 bssid[ETH_ALEN];
 671         u16 capability;
 672         int i;
 673
 674         lockdep_assert_held(&ifibss->mtx);
 675
 676         if (ifibss->fixed_bssid) {
 677                 memcpy(bssid, ifibss->bssid, ETH_ALEN);
 678         } else {
 679                 /* Generate random, not broadcast, locally administered BSSID. Mix in
 680                  * own MAC address to make sure that devices that do not have proper
 681                  * random number generator get different BSSID. */
 682                 get_random_bytes(bssid, ETH_ALEN);
 683                 for (i = 0; i < ETH_ALEN; i++)
 684                         bssid[i] ^= sdata->vif.addr[i];
 685                 bssid[0] &= ~0x01;
 686                 bssid[0] |= 0x02;
 687         }
 688
 689         printk(KERN_DEBUG "%s: Creating new IBSS network, BSSID %pM\n",
 690                sdata->name, bssid);
 691
 692         capability = WLAN_CAPABILITY_IBSS;
 693
 694         if (ifibss->privacy)
 695                 capability |= WLAN_CAPABILITY_PRIVACY;
 696         else
 697                 sdata->drop_unencrypted = 0;
 698
 699         __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int,
 700                                   ifibss->channel, ifibss->basic_rates,
 701                                   capability, 0);
 702 }
 703
 704 /*
 705  * This function is called with state == IEEE80211_IBSS_MLME_SEARCH
 706  */
 707
 708 static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
 709 {
 710         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 711         struct ieee80211_local *local = sdata->local;
 712         struct cfg80211_bss *cbss;
 713         struct ieee80211_channel *chan = NULL;
 714         const u8 *bssid = NULL;
 715         int active_ibss;
 716         u16 capability;
 717
 718         lockdep_assert_held(&ifibss->mtx);
 719
 720         active_ibss = ieee80211_sta_active_ibss(sdata);
 721 #ifdef CONFIG_MAC80211_IBSS_DEBUG
 722         printk(KERN_DEBUG "%s: sta_find_ibss (active_ibss=%d)\n",
 723                sdata->name, active_ibss);
 724 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
 725
 726         if (active_ibss)
 727                 return;
 728
 729         capability = WLAN_CAPABILITY_IBSS;
 730         if (ifibss->privacy)
 731                 capability |= WLAN_CAPABILITY_PRIVACY;
 732         if (ifibss->fixed_bssid)
 733                 bssid = ifibss->bssid;
 734         if (ifibss->fixed_channel)
 735                 chan = ifibss->channel;
 736         if (!is_zero_ether_addr(ifibss->bssid))
 737                 bssid = ifibss->bssid;
 738         cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid,
 739                                 ifibss->ssid, ifibss->ssid_len,
 740                                 WLAN_CAPABILITY_IBSS | WLAN_CAPABILITY_PRIVACY,
 741                                 capability);
 742
 743         if (cbss) {
 744                 struct ieee80211_bss *bss;
 745
 746                 bss = (void *)cbss->priv;
 747 #ifdef CONFIG_MAC80211_IBSS_DEBUG
 748                 printk(KERN_DEBUG "   sta_find_ibss: selected %pM current "
 749                        "%pM\n", cbss->bssid, ifibss->bssid);
 750 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
 751
 752                 printk(KERN_DEBUG "%s: Selected IBSS BSSID %pM"
 753                        " based on configured SSID\n",
 754                        sdata->name, cbss->bssid);
 755
 756                 ieee80211_sta_join_ibss(sdata, bss);
 757                 ieee80211_rx_bss_put(local, bss);
 758                 return;
 759         }
 760
 761 #ifdef CONFIG_MAC80211_IBSS_DEBUG
 762         printk(KERN_DEBUG "   did not try to join ibss\n");
 763 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
 764
 765         /* Selected IBSS not found in current scan results - try to scan */
 766         if (time_after(jiffies, ifibss->last_scan_completed +
 767                                         IEEE80211_SCAN_INTERVAL)) {
 768                 printk(KERN_DEBUG "%s: Trigger new scan to find an IBSS to "
 769                        "join\n", sdata->name);
 770
 771                 ieee80211_request_internal_scan(sdata,
 772                                 ifibss->ssid, ifibss->ssid_len,
 773                                 ifibss->fixed_channel ? ifibss->channel : NULL);
 774         } else {
 775                 int interval = IEEE80211_SCAN_INTERVAL;
 776
 777                 if (time_after(jiffies, ifibss->ibss_join_req +
 778                                IEEE80211_IBSS_JOIN_TIMEOUT)) {
 779                         if (!(local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS)) {
 780                                 ieee80211_sta_create_ibss(sdata);
 781                                 return;
 782                         }
 783                         printk(KERN_DEBUG "%s: IBSS not allowed on"
 784                                " %d MHz\n", sdata->name,
 785                                local->hw.conf.channel->center_freq);
 786
 787                         /* No IBSS found - decrease scan interval and continue
 788                          * scanning. */
 789                         interval = IEEE80211_SCAN_INTERVAL_SLOW;
 790                 }
 791
 792                 mod_timer(&ifibss->timer,
 793                           round_jiffies(jiffies + interval));
 794         }
 795 }
 796
 797 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
 798                                         struct sk_buff *req)
 799 {
 800         struct ieee80211_mgmt *mgmt = (void *)req->data;
 801         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 802         struct ieee80211_local *local = sdata->local;
 803         int tx_last_beacon, len = req->len;
 804         struct sk_buff *skb;
 805         struct ieee80211_mgmt *resp;
 806         struct sk_buff *presp;
 807         u8 *pos, *end;
 808
 809         lockdep_assert_held(&ifibss->mtx);
 810
 811         presp = rcu_dereference_protected(ifibss->presp,
 812                                           lockdep_is_held(&ifibss->mtx));
 813
 814         if (ifibss->state != IEEE80211_IBSS_MLME_JOINED ||
 815             len < 24 + 2 || !presp)
 816                 return;
 817
 818         tx_last_beacon = drv_tx_last_beacon(local);
 819
 820 #ifdef CONFIG_MAC80211_IBSS_DEBUG
 821         printk(KERN_DEBUG "%s: RX ProbeReq SA=%pM DA=%pM BSSID=%pM"
 822                " (tx_last_beacon=%d)\n",
 823                sdata->name, mgmt->sa, mgmt->da,
 824                mgmt->bssid, tx_last_beacon);
 825 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
 826
 827         if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da))
 828                 return;
 829
 830         if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) &&
 831             !is_broadcast_ether_addr(mgmt->bssid))
 832                 return;
 833
 834         end = ((u8 *) mgmt) + len;
 835         pos = mgmt->u.probe_req.variable;
 836         if (pos[0] != WLAN_EID_SSID ||
 837             pos + 2 + pos[1] > end) {
 838 #ifdef CONFIG_MAC80211_IBSS_DEBUG
 839                 printk(KERN_DEBUG "%s: Invalid SSID IE in ProbeReq "
 840                        "from %pM\n",
 841                        sdata->name, mgmt->sa);
 842 #endif
 843                 return;
 844         }
 845         if (pos[1] != 0 &&
 846             (pos[1] != ifibss->ssid_len ||
 847              memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) {
 848                 /* Ignore ProbeReq for foreign SSID */
 849                 return;
 850         }
 851
 852         /* Reply with ProbeResp */
 853         skb = skb_copy(presp, GFP_KERNEL);
 854         if (!skb)
 855                 return;
 856
 857         resp = (struct ieee80211_mgmt *) skb->data;
 858         memcpy(resp->da, mgmt->sa, ETH_ALEN);
 859 #ifdef CONFIG_MAC80211_IBSS_DEBUG
 860         printk(KERN_DEBUG "%s: Sending ProbeResp to %pM\n",
 861                sdata->name, resp->da);
 862 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
 863         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 864         ieee80211_tx_skb(sdata, skb);
 865 }
 866
 867 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
 868                                          struct ieee80211_mgmt *mgmt,
 869                                          size_t len,
 870                                          struct ieee80211_rx_status *rx_status)
 871 {
 872         size_t baselen;
 873         struct ieee802_11_elems elems;
 874
 875         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
 876         if (baselen > len)
 877                 return;
 878
 879         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
 880                                 &elems);
 881
 882         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
 883 }
 884
 885 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
 886                                      struct ieee80211_mgmt *mgmt,
 887                                      size_t len,
 888                                      struct ieee80211_rx_status *rx_status)
 889 {
 890         size_t baselen;
 891         struct ieee802_11_elems elems;
 892
 893         /* Process beacon from the current BSS */
 894         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
 895         if (baselen > len)
 896                 return;
 897
 898         ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems);
 899
 900         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true);
 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         mutex_lock(&sdata->u.ibss.mtx);
 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                 ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len,
 925                                              rx_status);
 926                 break;
 927         case IEEE80211_STYPE_BEACON:
 928                 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
 929                                          rx_status);
 930                 break;
 931         case IEEE80211_STYPE_AUTH:
 932                 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len);
 933                 break;
 934         }
 935
 936  mgmt_out:
 937         mutex_unlock(&sdata->u.ibss.mtx);
 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         mutex_lock(&ifibss->mtx);
 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, true);
 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         mutex_unlock(&ifibss->mtx);
 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         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 989         struct ieee80211_local *local = sdata->local;
 990
 991         if (local->quiescing) {
 992                 ifibss->timer_running = true;
 993                 return;
 994         }
 995
 996         ieee80211_queue_work(&local->hw, &sdata->work);
 997 }
 998
 999 #ifdef CONFIG_PM
1000 void ieee80211_ibss_quiesce(struct ieee80211_sub_if_data *sdata)
1001 {
1002         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1003
1004         if (del_timer_sync(&ifibss->timer))
1005                 ifibss->timer_running = true;
1006 }
1007
1008 void ieee80211_ibss_restart(struct ieee80211_sub_if_data *sdata)
1009 {
1010         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1011
1012         if (ifibss->timer_running) {
1013                 add_timer(&ifibss->timer);
1014                 ifibss->timer_running = false;
1015         }
1016 }
1017 #endif
1018
1019 void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata)
1020 {
1021         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1022
1023         setup_timer(&ifibss->timer, ieee80211_ibss_timer,
1024                     (unsigned long) sdata);
1025         mutex_init(&ifibss->mtx);
1026         INIT_LIST_HEAD(&ifibss->incomplete_stations);
1027         spin_lock_init(&ifibss->incomplete_lock);
1028 }
1029
1030 /* scan finished notification */
1031 void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local)
1032 {
1033         struct ieee80211_sub_if_data *sdata;
1034
1035         mutex_lock(&local->iflist_mtx);
1036         list_for_each_entry(sdata, &local->interfaces, list) {
1037                 if (!ieee80211_sdata_running(sdata))
1038                         continue;
1039                 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
1040                         continue;
1041                 sdata->u.ibss.last_scan_completed = jiffies;
1042                 ieee80211_queue_work(&local->hw, &sdata->work);
1043         }
1044         mutex_unlock(&local->iflist_mtx);
1045 }
1046
1047 int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
1048                         struct cfg80211_ibss_params *params)
1049 {
1050         struct sk_buff *skb;
1051         u32 changed = 0;
1052
1053         skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom +
1054                             sizeof(struct ieee80211_hdr_3addr) +
1055                             12 /* struct ieee80211_mgmt.u.beacon */ +
1056                             2 + IEEE80211_MAX_SSID_LEN /* max SSID */ +
1057                             2 + 8 /* max Supported Rates */ +
1058                             3 /* max DS params */ +
1059                             4 /* IBSS params */ +
1060                             2 + (IEEE80211_MAX_SUPP_RATES - 8) +
1061                             2 + sizeof(struct ieee80211_ht_cap) +
1062                             2 + sizeof(struct ieee80211_ht_operation) +
1063                             params->ie_len);
1064         if (!skb)
1065                 return -ENOMEM;
1066
1067         mutex_lock(&sdata->u.ibss.mtx);
1068
1069         if (params->bssid) {
1070                 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN);
1071                 sdata->u.ibss.fixed_bssid = true;
1072         } else
1073                 sdata->u.ibss.fixed_bssid = false;
1074
1075         sdata->u.ibss.privacy = params->privacy;
1076         sdata->u.ibss.control_port = params->control_port;
1077         sdata->u.ibss.basic_rates = params->basic_rates;
1078         memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate,
1079                sizeof(params->mcast_rate));
1080
1081         sdata->vif.bss_conf.beacon_int = params->beacon_interval;
1082
1083         sdata->u.ibss.channel = params->channel;
1084         sdata->u.ibss.channel_type = params->channel_type;
1085         sdata->u.ibss.fixed_channel = params->channel_fixed;
1086
1087         /* fix ourselves to that channel now already */
1088         if (params->channel_fixed) {
1089                 sdata->local->oper_channel = params->channel;
1090                 if (!ieee80211_set_channel_type(sdata->local, sdata,
1091                                                params->channel_type)) {
1092                         mutex_unlock(&sdata->u.ibss.mtx);
1093                         kfree_skb(skb);
1094                         return -EINVAL;
1095                 }
1096         }
1097
1098         if (params->ie) {
1099                 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len,
1100                                            GFP_KERNEL);
1101                 if (sdata->u.ibss.ie)
1102                         sdata->u.ibss.ie_len = params->ie_len;
1103         }
1104
1105         sdata->u.ibss.skb = skb;
1106         sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
1107         sdata->u.ibss.ibss_join_req = jiffies;
1108
1109         memcpy(sdata->u.ibss.ssid, params->ssid, IEEE80211_MAX_SSID_LEN);
1110         sdata->u.ibss.ssid_len = params->ssid_len;
1111
1112         mutex_unlock(&sdata->u.ibss.mtx);
1113
1114         mutex_lock(&sdata->local->mtx);
1115         ieee80211_recalc_idle(sdata->local);
1116         mutex_unlock(&sdata->local->mtx);
1117
1118         /*
1119          * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is
1120          * reserved, but an HT STA shall protect HT transmissions as though
1121          * the HT Protection field were set to non-HT mixed mode.
1122          *
1123          * In an IBSS, the RIFS Mode field of the HT Operation element is
1124          * also reserved, but an HT STA shall operate as though this field
1125          * were set to 1.
1126          */
1127
1128         sdata->vif.bss_conf.ht_operation_mode |=
1129                   IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED
1130                 | IEEE80211_HT_PARAM_RIFS_MODE;
1131
1132         changed |= BSS_CHANGED_HT;
1133         ieee80211_bss_info_change_notify(sdata, changed);
1134
1135         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1136
1137         return 0;
1138 }
1139
1140 int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata)
1141 {
1142         struct sk_buff *skb;
1143         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1144         struct ieee80211_local *local = sdata->local;
1145         struct cfg80211_bss *cbss;
1146         u16 capability;
1147         int active_ibss;
1148         struct sta_info *sta;
1149
1150         mutex_lock(&sdata->u.ibss.mtx);
1151
1152         sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
1153         memset(sdata->u.ibss.bssid, 0, ETH_ALEN);
1154         sdata->u.ibss.ssid_len = 0;
1155
1156         active_ibss = ieee80211_sta_active_ibss(sdata);
1157
1158         if (!active_ibss && !is_zero_ether_addr(ifibss->bssid)) {
1159                 capability = WLAN_CAPABILITY_IBSS;
1160
1161                 if (ifibss->privacy)
1162                         capability |= WLAN_CAPABILITY_PRIVACY;
1163
1164                 cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->channel,
1165                                         ifibss->bssid, ifibss->ssid,
1166                                         ifibss->ssid_len, WLAN_CAPABILITY_IBSS |
1167                                         WLAN_CAPABILITY_PRIVACY,
1168                                         capability);
1169
1170                 if (cbss) {
1171                         cfg80211_unlink_bss(local->hw.wiphy, cbss);
1172                         cfg80211_put_bss(cbss);
1173                 }
1174         }
1175
1176         sta_info_flush(sdata->local, sdata);
1177
1178         spin_lock_bh(&ifibss->incomplete_lock);
1179         while (!list_empty(&ifibss->incomplete_stations)) {
1180                 sta = list_first_entry(&ifibss->incomplete_stations,
1181                                        struct sta_info, list);
1182                 list_del(&sta->list);
1183                 spin_unlock_bh(&ifibss->incomplete_lock);
1184
1185                 sta_info_free(local, sta);
1186                 spin_lock_bh(&ifibss->incomplete_lock);
1187         }
1188         spin_unlock_bh(&ifibss->incomplete_lock);
1189
1190         netif_carrier_off(sdata->dev);
1191
1192         /* remove beacon */
1193         kfree(sdata->u.ibss.ie);
1194         skb = rcu_dereference_protected(sdata->u.ibss.presp,
1195                                         lockdep_is_held(&sdata->u.ibss.mtx));
1196         RCU_INIT_POINTER(sdata->u.ibss.presp, NULL);
1197         sdata->vif.bss_conf.ibss_joined = false;
1198         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED |
1199                                                 BSS_CHANGED_IBSS);
1200         synchronize_rcu();
1201         kfree_skb(skb);
1202
1203         skb_queue_purge(&sdata->skb_queue);
1204
1205         del_timer_sync(&sdata->u.ibss.timer);
1206
1207         mutex_unlock(&sdata->u.ibss.mtx);
1208
1209         mutex_lock(&local->mtx);
1210         ieee80211_recalc_idle(sdata->local);
1211         mutex_unlock(&local->mtx);
1212
1213         return 0;
1214 }