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 (compare_ether_addr(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);
 168         }
 169
 170         if (local->hw.queues >= 4) {
 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                 if (net_ratelimit())
 307                         printk(KERN_DEBUG "%s: No room for a new IBSS STA entry %pM\n",
 308                                sdata->name, addr);
 309                 rcu_read_lock();
 310                 return NULL;
 311         }
 312
 313         if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) {
 314                 rcu_read_lock();
 315                 return NULL;
 316         }
 317
 318         if (compare_ether_addr(bssid, sdata->u.ibss.bssid)) {
 319                 rcu_read_lock();
 320                 return NULL;
 321         }
 322
 323         sta = sta_info_alloc(sdata, addr, GFP_KERNEL);
 324         if (!sta) {
 325                 rcu_read_lock();
 326                 return NULL;
 327         }
 328
 329         sta->last_rx = jiffies;
 330
 331         /* make sure mandatory rates are always added */
 332         sta->sta.supp_rates[band] = supp_rates |
 333                         ieee80211_mandatory_rates(local, band);
 334
 335         return ieee80211_ibss_finish_sta(sta, auth);
 336 }
 337
 338 static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata,
 339                                         struct ieee80211_mgmt *mgmt,
 340                                         size_t len)
 341 {
 342         u16 auth_alg, auth_transaction;
 343
 344         lockdep_assert_held(&sdata->u.ibss.mtx);
 345
 346         if (len < 24 + 6)
 347                 return;
 348
 349         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
 350         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
 351
 352         if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
 353                 return;
 354 #ifdef CONFIG_MAC80211_IBSS_DEBUG
 355         printk(KERN_DEBUG "%s: RX Auth SA=%pM DA=%pM BSSID=%pM."
 356                "(auth_transaction=%d)\n",
 357                sdata->name, mgmt->sa, mgmt->da, mgmt->bssid, auth_transaction);
 358 #endif
 359         sta_info_destroy_addr(sdata, mgmt->sa);
 360         ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, 0, false);
 361         rcu_read_unlock();
 362
 363         /*
 364          * IEEE 802.11 standard does not require authentication in IBSS
 365          * networks and most implementations do not seem to use it.
 366          * However, try to reply to authentication attempts if someone
 367          * has actually implemented this.
 368          */
 369         ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, NULL, 0,
 370                             mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0);
 371 }
 372
 373 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
 374                                   struct ieee80211_mgmt *mgmt,
 375                                   size_t len,
 376                                   struct ieee80211_rx_status *rx_status,
 377                                   struct ieee802_11_elems *elems,
 378                                   bool beacon)
 379 {
 380         struct ieee80211_local *local = sdata->local;
 381         int freq;
 382         struct cfg80211_bss *cbss;
 383         struct ieee80211_bss *bss;
 384         struct sta_info *sta;
 385         struct ieee80211_channel *channel;
 386         u64 beacon_timestamp, rx_timestamp;
 387         u32 supp_rates = 0;
 388         enum ieee80211_band band = rx_status->band;
 389         struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band];
 390         bool rates_updated = false;
 391
 392         if (elems->ds_params && elems->ds_params_len == 1)
 393                 freq = ieee80211_channel_to_frequency(elems->ds_params[0],
 394                                                       band);
 395         else
 396                 freq = rx_status->freq;
 397
 398         channel = ieee80211_get_channel(local->hw.wiphy, freq);
 399
 400         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
 401                 return;
 402
 403         if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
 404             compare_ether_addr(mgmt->bssid, sdata->u.ibss.bssid) == 0) {
 405
 406                 rcu_read_lock();
 407                 sta = sta_info_get(sdata, mgmt->sa);
 408
 409                 if (elems->supp_rates) {
 410                         supp_rates = ieee80211_sta_get_rates(local, elems,
 411                                                              band);
 412                         if (sta) {
 413                                 u32 prev_rates;
 414
 415                                 prev_rates = sta->sta.supp_rates[band];
 416                                 /* make sure mandatory rates are always added */
 417                                 sta->sta.supp_rates[band] = supp_rates |
 418                                         ieee80211_mandatory_rates(local, band);
 419
 420                                 if (sta->sta.supp_rates[band] != prev_rates) {
 421 #ifdef CONFIG_MAC80211_IBSS_DEBUG
 422                                         printk(KERN_DEBUG
 423                                                 "%s: updated supp_rates set "
 424                                                 "for %pM based on beacon"
 425                                                 "/probe_resp (0x%x -> 0x%x)\n",
 426                                                 sdata->name, sta->sta.addr,
 427                                                 prev_rates,
 428                                                 sta->sta.supp_rates[band]);
 429 #endif
 430                                         rates_updated = true;
 431                                 }
 432                         } else {
 433                                 rcu_read_unlock();
 434                                 sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid,
 435                                                 mgmt->sa, supp_rates, true);
 436                         }
 437                 }
 438
 439                 if (sta && elems->wmm_info)
 440                         set_sta_flag(sta, WLAN_STA_WME);
 441
 442                 if (sta && elems->ht_operation && elems->ht_cap_elem &&
 443                     sdata->u.ibss.channel_type != NL80211_CHAN_NO_HT) {
 444                         /* we both use HT */
 445                         struct ieee80211_sta_ht_cap sta_ht_cap_new;
 446                         enum nl80211_channel_type channel_type =
 447                                 ieee80211_ht_oper_to_channel_type(
 448                                                         elems->ht_operation);
 449
 450                         ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
 451                                                           elems->ht_cap_elem,
 452                                                           &sta_ht_cap_new);
 453
 454                         /*
 455                          * fall back to HT20 if we don't use or use
 456                          * the other extension channel
 457                          */
 458                         if ((channel_type == NL80211_CHAN_HT40MINUS ||
 459                              channel_type == NL80211_CHAN_HT40PLUS) &&
 460                             channel_type != sdata->u.ibss.channel_type)
 461                                 sta_ht_cap_new.cap &=
 462                                         ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 463
 464                         if (memcmp(&sta->sta.ht_cap, &sta_ht_cap_new,
 465                                    sizeof(sta_ht_cap_new))) {
 466                                 memcpy(&sta->sta.ht_cap, &sta_ht_cap_new,
 467                                        sizeof(sta_ht_cap_new));
 468                                 rates_updated = true;
 469                         }
 470                 }
 471
 472                 if (sta && rates_updated)
 473                         rate_control_rate_init(sta);
 474
 475                 rcu_read_unlock();
 476         }
 477
 478         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
 479                                         channel, beacon);
 480         if (!bss)
 481                 return;
 482
 483         cbss = container_of((void *)bss, struct cfg80211_bss, priv);
 484
 485         /* was just updated in ieee80211_bss_info_update */
 486         beacon_timestamp = cbss->tsf;
 487
 488         /* check if we need to merge IBSS */
 489
 490         /* we use a fixed BSSID */
 491         if (sdata->u.ibss.fixed_bssid)
 492                 goto put_bss;
 493
 494         /* not an IBSS */
 495         if (!(cbss->capability & WLAN_CAPABILITY_IBSS))
 496                 goto put_bss;
 497
 498         /* different channel */
 499         if (cbss->channel != local->oper_channel)
 500                 goto put_bss;
 501
 502         /* different SSID */
 503         if (elems->ssid_len != sdata->u.ibss.ssid_len ||
 504             memcmp(elems->ssid, sdata->u.ibss.ssid,
 505                                 sdata->u.ibss.ssid_len))
 506                 goto put_bss;
 507
 508         /* same BSSID */
 509         if (compare_ether_addr(cbss->bssid, sdata->u.ibss.bssid) == 0)
 510                 goto put_bss;
 511
 512         if (rx_status->flag & RX_FLAG_MACTIME_MPDU) {
 513                 /*
 514                  * For correct IBSS merging we need mactime; since mactime is
 515                  * defined as the time the first data symbol of the frame hits
 516                  * the PHY, and the timestamp of the beacon is defined as "the
 517                  * time that the data symbol containing the first bit of the
 518                  * timestamp is transmitted to the PHY plus the transmitting
 519                  * STA's delays through its local PHY from the MAC-PHY
 520                  * interface to its interface with the WM" (802.11 11.1.2)
 521                  * - equals the time this bit arrives at the receiver - we have
 522                  * to take into account the offset between the two.
 523                  *
 524                  * E.g. at 1 MBit that means mactime is 192 usec earlier
 525                  * (=24 bytes * 8 usecs/byte) than the beacon timestamp.
 526                  */
 527                 int rate;
 528
 529                 if (rx_status->flag & RX_FLAG_HT)
 530                         rate = 65; /* TODO: HT rates */
 531                 else
 532                         rate = local->hw.wiphy->bands[band]->
 533                                 bitrates[rx_status->rate_idx].bitrate;
 534
 535                 rx_timestamp = rx_status->mactime + (24 * 8 * 10 / rate);
 536         } else {
 537                 /*
 538                  * second best option: get current TSF
 539                  * (will return -1 if not supported)
 540                  */
 541                 rx_timestamp = drv_get_tsf(local, sdata);
 542         }
 543
 544 #ifdef CONFIG_MAC80211_IBSS_DEBUG
 545         printk(KERN_DEBUG "RX beacon SA=%pM BSSID="
 546                "%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
 547                mgmt->sa, mgmt->bssid,
 548                (unsigned long long)rx_timestamp,
 549                (unsigned long long)beacon_timestamp,
 550                (unsigned long long)(rx_timestamp - beacon_timestamp),
 551                jiffies);
 552 #endif
 553
 554         if (beacon_timestamp > rx_timestamp) {
 555 #ifdef CONFIG_MAC80211_IBSS_DEBUG
 556                 printk(KERN_DEBUG "%s: beacon TSF higher than "
 557                        "local TSF - IBSS merge with BSSID %pM\n",
 558                        sdata->name, mgmt->bssid);
 559 #endif
 560                 ieee80211_sta_join_ibss(sdata, bss);
 561                 supp_rates = ieee80211_sta_get_rates(local, elems, band);
 562                 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa,
 563                                        supp_rates, true);
 564                 rcu_read_unlock();
 565         }
 566
 567  put_bss:
 568         ieee80211_rx_bss_put(local, bss);
 569 }
 570
 571 void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata,
 572                               const u8 *bssid, const u8 *addr,
 573                               u32 supp_rates)
 574 {
 575         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 576         struct ieee80211_local *local = sdata->local;
 577         struct sta_info *sta;
 578         int band = local->hw.conf.channel->band;
 579
 580         /*
 581          * XXX: Consider removing the least recently used entry and
 582          *      allow new one to be added.
 583          */
 584         if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
 585                 if (net_ratelimit())
 586                         printk(KERN_DEBUG "%s: No room for a new IBSS STA entry %pM\n",
 587                                sdata->name, addr);
 588                 return;
 589         }
 590
 591         if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH)
 592                 return;
 593
 594         if (compare_ether_addr(bssid, sdata->u.ibss.bssid))
 595                 return;
 596
 597         sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
 598         if (!sta)
 599                 return;
 600
 601         sta->last_rx = jiffies;
 602
 603         /* make sure mandatory rates are always added */
 604         sta->sta.supp_rates[band] = supp_rates |
 605                         ieee80211_mandatory_rates(local, band);
 606
 607         spin_lock(&ifibss->incomplete_lock);
 608         list_add(&sta->list, &ifibss->incomplete_stations);
 609         spin_unlock(&ifibss->incomplete_lock);
 610         ieee80211_queue_work(&local->hw, &sdata->work);
 611 }
 612
 613 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
 614 {
 615         struct ieee80211_local *local = sdata->local;
 616         int active = 0;
 617         struct sta_info *sta;
 618
 619         lockdep_assert_held(&sdata->u.ibss.mtx);
 620
 621         rcu_read_lock();
 622
 623         list_for_each_entry_rcu(sta, &local->sta_list, list) {
 624                 if (sta->sdata == sdata &&
 625                     time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
 626                                jiffies)) {
 627                         active++;
 628                         break;
 629                 }
 630         }
 631
 632         rcu_read_unlock();
 633
 634         return active;
 635 }
 636
 637 /*
 638  * This function is called with state == IEEE80211_IBSS_MLME_JOINED
 639  */
 640
 641 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
 642 {
 643         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 644
 645         lockdep_assert_held(&ifibss->mtx);
 646
 647         mod_timer(&ifibss->timer,
 648                   round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
 649
 650         ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT);
 651
 652         if (time_before(jiffies, ifibss->last_scan_completed +
 653                        IEEE80211_IBSS_MERGE_INTERVAL))
 654                 return;
 655
 656         if (ieee80211_sta_active_ibss(sdata))
 657                 return;
 658
 659         if (ifibss->fixed_channel)
 660                 return;
 661
 662         printk(KERN_DEBUG "%s: No active IBSS STAs - trying to scan for other "
 663                "IBSS networks with same SSID (merge)\n", sdata->name);
 664
 665         ieee80211_request_internal_scan(sdata,
 666                         ifibss->ssid, ifibss->ssid_len, NULL);
 667 }
 668
 669 static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
 670 {
 671         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 672         u8 bssid[ETH_ALEN];
 673         u16 capability;
 674         int i;
 675
 676         lockdep_assert_held(&ifibss->mtx);
 677
 678         if (ifibss->fixed_bssid) {
 679                 memcpy(bssid, ifibss->bssid, ETH_ALEN);
 680         } else {
 681                 /* Generate random, not broadcast, locally administered BSSID. Mix in
 682                  * own MAC address to make sure that devices that do not have proper
 683                  * random number generator get different BSSID. */
 684                 get_random_bytes(bssid, ETH_ALEN);
 685                 for (i = 0; i < ETH_ALEN; i++)
 686                         bssid[i] ^= sdata->vif.addr[i];
 687                 bssid[0] &= ~0x01;
 688                 bssid[0] |= 0x02;
 689         }
 690
 691         printk(KERN_DEBUG "%s: Creating new IBSS network, BSSID %pM\n",
 692                sdata->name, bssid);
 693
 694         capability = WLAN_CAPABILITY_IBSS;
 695
 696         if (ifibss->privacy)
 697                 capability |= WLAN_CAPABILITY_PRIVACY;
 698         else
 699                 sdata->drop_unencrypted = 0;
 700
 701         __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int,
 702                                   ifibss->channel, ifibss->basic_rates,
 703                                   capability, 0);
 704 }
 705
 706 /*
 707  * This function is called with state == IEEE80211_IBSS_MLME_SEARCH
 708  */
 709
 710 static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
 711 {
 712         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 713         struct ieee80211_local *local = sdata->local;
 714         struct cfg80211_bss *cbss;
 715         struct ieee80211_channel *chan = NULL;
 716         const u8 *bssid = NULL;
 717         int active_ibss;
 718         u16 capability;
 719
 720         lockdep_assert_held(&ifibss->mtx);
 721
 722         active_ibss = ieee80211_sta_active_ibss(sdata);
 723 #ifdef CONFIG_MAC80211_IBSS_DEBUG
 724         printk(KERN_DEBUG "%s: sta_find_ibss (active_ibss=%d)\n",
 725                sdata->name, active_ibss);
 726 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
 727
 728         if (active_ibss)
 729                 return;
 730
 731         capability = WLAN_CAPABILITY_IBSS;
 732         if (ifibss->privacy)
 733                 capability |= WLAN_CAPABILITY_PRIVACY;
 734         if (ifibss->fixed_bssid)
 735                 bssid = ifibss->bssid;
 736         if (ifibss->fixed_channel)
 737                 chan = ifibss->channel;
 738         if (!is_zero_ether_addr(ifibss->bssid))
 739                 bssid = ifibss->bssid;
 740         cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid,
 741                                 ifibss->ssid, ifibss->ssid_len,
 742                                 WLAN_CAPABILITY_IBSS | WLAN_CAPABILITY_PRIVACY,
 743                                 capability);
 744
 745         if (cbss) {
 746                 struct ieee80211_bss *bss;
 747
 748                 bss = (void *)cbss->priv;
 749 #ifdef CONFIG_MAC80211_IBSS_DEBUG
 750                 printk(KERN_DEBUG "   sta_find_ibss: selected %pM current "
 751                        "%pM\n", cbss->bssid, ifibss->bssid);
 752 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
 753
 754                 printk(KERN_DEBUG "%s: Selected IBSS BSSID %pM"
 755                        " based on configured SSID\n",
 756                        sdata->name, cbss->bssid);
 757
 758                 ieee80211_sta_join_ibss(sdata, bss);
 759                 ieee80211_rx_bss_put(local, bss);
 760                 return;
 761         }
 762
 763 #ifdef CONFIG_MAC80211_IBSS_DEBUG
 764         printk(KERN_DEBUG "   did not try to join ibss\n");
 765 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
 766
 767         /* Selected IBSS not found in current scan results - try to scan */
 768         if (time_after(jiffies, ifibss->last_scan_completed +
 769                                         IEEE80211_SCAN_INTERVAL)) {
 770                 printk(KERN_DEBUG "%s: Trigger new scan to find an IBSS to "
 771                        "join\n", sdata->name);
 772
 773                 ieee80211_request_internal_scan(sdata,
 774                                 ifibss->ssid, ifibss->ssid_len,
 775                                 ifibss->fixed_channel ? ifibss->channel : NULL);
 776         } else {
 777                 int interval = IEEE80211_SCAN_INTERVAL;
 778
 779                 if (time_after(jiffies, ifibss->ibss_join_req +
 780                                IEEE80211_IBSS_JOIN_TIMEOUT)) {
 781                         if (!(local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS)) {
 782                                 ieee80211_sta_create_ibss(sdata);
 783                                 return;
 784                         }
 785                         printk(KERN_DEBUG "%s: IBSS not allowed on"
 786                                " %d MHz\n", sdata->name,
 787                                local->hw.conf.channel->center_freq);
 788
 789                         /* No IBSS found - decrease scan interval and continue
 790                          * scanning. */
 791                         interval = IEEE80211_SCAN_INTERVAL_SLOW;
 792                 }
 793
 794                 mod_timer(&ifibss->timer,
 795                           round_jiffies(jiffies + interval));
 796         }
 797 }
 798
 799 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
 800                                         struct sk_buff *req)
 801 {
 802         struct ieee80211_mgmt *mgmt = (void *)req->data;
 803         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 804         struct ieee80211_local *local = sdata->local;
 805         int tx_last_beacon, len = req->len;
 806         struct sk_buff *skb;
 807         struct ieee80211_mgmt *resp;
 808         struct sk_buff *presp;
 809         u8 *pos, *end;
 810
 811         lockdep_assert_held(&ifibss->mtx);
 812
 813         presp = rcu_dereference_protected(ifibss->presp,
 814                                           lockdep_is_held(&ifibss->mtx));
 815
 816         if (ifibss->state != IEEE80211_IBSS_MLME_JOINED ||
 817             len < 24 + 2 || !presp)
 818                 return;
 819
 820         tx_last_beacon = drv_tx_last_beacon(local);
 821
 822 #ifdef CONFIG_MAC80211_IBSS_DEBUG
 823         printk(KERN_DEBUG "%s: RX ProbeReq SA=%pM DA=%pM BSSID=%pM"
 824                " (tx_last_beacon=%d)\n",
 825                sdata->name, mgmt->sa, mgmt->da,
 826                mgmt->bssid, tx_last_beacon);
 827 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
 828
 829         if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da))
 830                 return;
 831
 832         if (compare_ether_addr(mgmt->bssid, ifibss->bssid) != 0 &&
 833             !is_broadcast_ether_addr(mgmt->bssid))
 834                 return;
 835
 836         end = ((u8 *) mgmt) + len;
 837         pos = mgmt->u.probe_req.variable;
 838         if (pos[0] != WLAN_EID_SSID ||
 839             pos + 2 + pos[1] > end) {
 840 #ifdef CONFIG_MAC80211_IBSS_DEBUG
 841                 printk(KERN_DEBUG "%s: Invalid SSID IE in ProbeReq "
 842                        "from %pM\n",
 843                        sdata->name, mgmt->sa);
 844 #endif
 845                 return;
 846         }
 847         if (pos[1] != 0 &&
 848             (pos[1] != ifibss->ssid_len ||
 849              memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) {
 850                 /* Ignore ProbeReq for foreign SSID */
 851                 return;
 852         }
 853
 854         /* Reply with ProbeResp */
 855         skb = skb_copy(presp, GFP_KERNEL);
 856         if (!skb)
 857                 return;
 858
 859         resp = (struct ieee80211_mgmt *) skb->data;
 860         memcpy(resp->da, mgmt->sa, ETH_ALEN);
 861 #ifdef CONFIG_MAC80211_IBSS_DEBUG
 862         printk(KERN_DEBUG "%s: Sending ProbeResp to %pM\n",
 863                sdata->name, resp->da);
 864 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
 865         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 866         ieee80211_tx_skb(sdata, skb);
 867 }
 868
 869 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
 870                                          struct ieee80211_mgmt *mgmt,
 871                                          size_t len,
 872                                          struct ieee80211_rx_status *rx_status)
 873 {
 874         size_t baselen;
 875         struct ieee802_11_elems elems;
 876
 877         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
 878         if (baselen > len)
 879                 return;
 880
 881         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
 882                                 &elems);
 883
 884         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
 885 }
 886
 887 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
 888                                      struct ieee80211_mgmt *mgmt,
 889                                      size_t len,
 890                                      struct ieee80211_rx_status *rx_status)
 891 {
 892         size_t baselen;
 893         struct ieee802_11_elems elems;
 894
 895         /* Process beacon from the current BSS */
 896         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
 897         if (baselen > len)
 898                 return;
 899
 900         ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems);
 901
 902         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true);
 903 }
 904
 905 void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
 906                                    struct sk_buff *skb)
 907 {
 908         struct ieee80211_rx_status *rx_status;
 909         struct ieee80211_mgmt *mgmt;
 910         u16 fc;
 911
 912         rx_status = IEEE80211_SKB_RXCB(skb);
 913         mgmt = (struct ieee80211_mgmt *) skb->data;
 914         fc = le16_to_cpu(mgmt->frame_control);
 915
 916         mutex_lock(&sdata->u.ibss.mtx);
 917
 918         if (!sdata->u.ibss.ssid_len)
 919                 goto mgmt_out; /* not ready to merge yet */
 920
 921         switch (fc & IEEE80211_FCTL_STYPE) {
 922         case IEEE80211_STYPE_PROBE_REQ:
 923                 ieee80211_rx_mgmt_probe_req(sdata, skb);
 924                 break;
 925         case IEEE80211_STYPE_PROBE_RESP:
 926                 ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len,
 927                                              rx_status);
 928                 break;
 929         case IEEE80211_STYPE_BEACON:
 930                 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
 931                                          rx_status);
 932                 break;
 933         case IEEE80211_STYPE_AUTH:
 934                 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len);
 935                 break;
 936         }
 937
 938  mgmt_out:
 939         mutex_unlock(&sdata->u.ibss.mtx);
 940 }
 941
 942 void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata)
 943 {
 944         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 945         struct sta_info *sta;
 946
 947         mutex_lock(&ifibss->mtx);
 948
 949         /*
 950          * Work could be scheduled after scan or similar
 951          * when we aren't even joined (or trying) with a
 952          * network.
 953          */
 954         if (!ifibss->ssid_len)
 955                 goto out;
 956
 957         spin_lock_bh(&ifibss->incomplete_lock);
 958         while (!list_empty(&ifibss->incomplete_stations)) {
 959                 sta = list_first_entry(&ifibss->incomplete_stations,
 960                                        struct sta_info, list);
 961                 list_del(&sta->list);
 962                 spin_unlock_bh(&ifibss->incomplete_lock);
 963
 964                 ieee80211_ibss_finish_sta(sta, true);
 965                 rcu_read_unlock();
 966                 spin_lock_bh(&ifibss->incomplete_lock);
 967         }
 968         spin_unlock_bh(&ifibss->incomplete_lock);
 969
 970         switch (ifibss->state) {
 971         case IEEE80211_IBSS_MLME_SEARCH:
 972                 ieee80211_sta_find_ibss(sdata);
 973                 break;
 974         case IEEE80211_IBSS_MLME_JOINED:
 975                 ieee80211_sta_merge_ibss(sdata);
 976                 break;
 977         default:
 978                 WARN_ON(1);
 979                 break;
 980         }
 981
 982  out:
 983         mutex_unlock(&ifibss->mtx);
 984 }
 985
 986 static void ieee80211_ibss_timer(unsigned long data)
 987 {
 988         struct ieee80211_sub_if_data *sdata =
 989                 (struct ieee80211_sub_if_data *) data;
 990         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 991         struct ieee80211_local *local = sdata->local;
 992
 993         if (local->quiescing) {
 994                 ifibss->timer_running = true;
 995                 return;
 996         }
 997
 998         ieee80211_queue_work(&local->hw, &sdata->work);
 999 }
1000
1001 #ifdef CONFIG_PM
1002 void ieee80211_ibss_quiesce(struct ieee80211_sub_if_data *sdata)
1003 {
1004         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1005
1006         if (del_timer_sync(&ifibss->timer))
1007                 ifibss->timer_running = true;
1008 }
1009
1010 void ieee80211_ibss_restart(struct ieee80211_sub_if_data *sdata)
1011 {
1012         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1013
1014         if (ifibss->timer_running) {
1015                 add_timer(&ifibss->timer);
1016                 ifibss->timer_running = false;
1017         }
1018 }
1019 #endif
1020
1021 void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata)
1022 {
1023         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1024
1025         setup_timer(&ifibss->timer, ieee80211_ibss_timer,
1026                     (unsigned long) sdata);
1027         mutex_init(&ifibss->mtx);
1028         INIT_LIST_HEAD(&ifibss->incomplete_stations);
1029         spin_lock_init(&ifibss->incomplete_lock);
1030 }
1031
1032 /* scan finished notification */
1033 void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local)
1034 {
1035         struct ieee80211_sub_if_data *sdata;
1036
1037         mutex_lock(&local->iflist_mtx);
1038         list_for_each_entry(sdata, &local->interfaces, list) {
1039                 if (!ieee80211_sdata_running(sdata))
1040                         continue;
1041                 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
1042                         continue;
1043                 sdata->u.ibss.last_scan_completed = jiffies;
1044                 ieee80211_queue_work(&local->hw, &sdata->work);
1045         }
1046         mutex_unlock(&local->iflist_mtx);
1047 }
1048
1049 int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
1050                         struct cfg80211_ibss_params *params)
1051 {
1052         struct sk_buff *skb;
1053         u32 changed = 0;
1054
1055         skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom +
1056                             sizeof(struct ieee80211_hdr_3addr) +
1057                             12 /* struct ieee80211_mgmt.u.beacon */ +
1058                             2 + IEEE80211_MAX_SSID_LEN /* max SSID */ +
1059                             2 + 8 /* max Supported Rates */ +
1060                             3 /* max DS params */ +
1061                             4 /* IBSS params */ +
1062                             2 + (IEEE80211_MAX_SUPP_RATES - 8) +
1063                             2 + sizeof(struct ieee80211_ht_cap) +
1064                             2 + sizeof(struct ieee80211_ht_operation) +
1065                             params->ie_len);
1066         if (!skb)
1067                 return -ENOMEM;
1068
1069         mutex_lock(&sdata->u.ibss.mtx);
1070
1071         if (params->bssid) {
1072                 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN);
1073                 sdata->u.ibss.fixed_bssid = true;
1074         } else
1075                 sdata->u.ibss.fixed_bssid = false;
1076
1077         sdata->u.ibss.privacy = params->privacy;
1078         sdata->u.ibss.control_port = params->control_port;
1079         sdata->u.ibss.basic_rates = params->basic_rates;
1080         memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate,
1081                sizeof(params->mcast_rate));
1082
1083         sdata->vif.bss_conf.beacon_int = params->beacon_interval;
1084
1085         sdata->u.ibss.channel = params->channel;
1086         sdata->u.ibss.channel_type = params->channel_type;
1087         sdata->u.ibss.fixed_channel = params->channel_fixed;
1088
1089         /* fix ourselves to that channel now already */
1090         if (params->channel_fixed) {
1091                 sdata->local->oper_channel = params->channel;
1092                 if (!ieee80211_set_channel_type(sdata->local, sdata,
1093                                                params->channel_type)) {
1094                         mutex_unlock(&sdata->u.ibss.mtx);
1095                         kfree_skb(skb);
1096                         return -EINVAL;
1097                 }
1098         }
1099
1100         if (params->ie) {
1101                 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len,
1102                                            GFP_KERNEL);
1103                 if (sdata->u.ibss.ie)
1104                         sdata->u.ibss.ie_len = params->ie_len;
1105         }
1106
1107         sdata->u.ibss.skb = skb;
1108         sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
1109         sdata->u.ibss.ibss_join_req = jiffies;
1110
1111         memcpy(sdata->u.ibss.ssid, params->ssid, IEEE80211_MAX_SSID_LEN);
1112         sdata->u.ibss.ssid_len = params->ssid_len;
1113
1114         mutex_unlock(&sdata->u.ibss.mtx);
1115
1116         mutex_lock(&sdata->local->mtx);
1117         ieee80211_recalc_idle(sdata->local);
1118         mutex_unlock(&sdata->local->mtx);
1119
1120         /*
1121          * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is
1122          * reserved, but an HT STA shall protect HT transmissions as though
1123          * the HT Protection field were set to non-HT mixed mode.
1124          *
1125          * In an IBSS, the RIFS Mode field of the HT Operation element is
1126          * also reserved, but an HT STA shall operate as though this field
1127          * were set to 1.
1128          */
1129
1130         sdata->vif.bss_conf.ht_operation_mode |=
1131                   IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED
1132                 | IEEE80211_HT_PARAM_RIFS_MODE;
1133
1134         changed |= BSS_CHANGED_HT;
1135         ieee80211_bss_info_change_notify(sdata, changed);
1136
1137         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1138
1139         return 0;
1140 }
1141
1142 int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata)
1143 {
1144         struct sk_buff *skb;
1145         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1146         struct ieee80211_local *local = sdata->local;
1147         struct cfg80211_bss *cbss;
1148         u16 capability;
1149         int active_ibss;
1150         struct sta_info *sta;
1151
1152         mutex_lock(&sdata->u.ibss.mtx);
1153
1154         sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
1155         memset(sdata->u.ibss.bssid, 0, ETH_ALEN);
1156         sdata->u.ibss.ssid_len = 0;
1157
1158         active_ibss = ieee80211_sta_active_ibss(sdata);
1159
1160         if (!active_ibss && !is_zero_ether_addr(ifibss->bssid)) {
1161                 capability = WLAN_CAPABILITY_IBSS;
1162
1163                 if (ifibss->privacy)
1164                         capability |= WLAN_CAPABILITY_PRIVACY;
1165
1166                 cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->channel,
1167                                         ifibss->bssid, ifibss->ssid,
1168                                         ifibss->ssid_len, WLAN_CAPABILITY_IBSS |
1169                                         WLAN_CAPABILITY_PRIVACY,
1170                                         capability);
1171
1172                 if (cbss) {
1173                         cfg80211_unlink_bss(local->hw.wiphy, cbss);
1174                         cfg80211_put_bss(cbss);
1175                 }
1176         }
1177
1178         sta_info_flush(sdata->local, sdata);
1179
1180         spin_lock_bh(&ifibss->incomplete_lock);
1181         while (!list_empty(&ifibss->incomplete_stations)) {
1182                 sta = list_first_entry(&ifibss->incomplete_stations,
1183                                        struct sta_info, list);
1184                 list_del(&sta->list);
1185                 spin_unlock_bh(&ifibss->incomplete_lock);
1186
1187                 sta_info_free(local, sta);
1188                 spin_lock_bh(&ifibss->incomplete_lock);
1189         }
1190         spin_unlock_bh(&ifibss->incomplete_lock);
1191
1192         netif_carrier_off(sdata->dev);
1193
1194         /* remove beacon */
1195         kfree(sdata->u.ibss.ie);
1196         skb = rcu_dereference_protected(sdata->u.ibss.presp,
1197                                         lockdep_is_held(&sdata->u.ibss.mtx));
1198         RCU_INIT_POINTER(sdata->u.ibss.presp, NULL);
1199         sdata->vif.bss_conf.ibss_joined = false;
1200         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED |
1201                                                 BSS_CHANGED_IBSS);
1202         synchronize_rcu();
1203         kfree_skb(skb);
1204
1205         skb_queue_purge(&sdata->skb_queue);
1206
1207         del_timer_sync(&sdata->u.ibss.timer);
1208
1209         mutex_unlock(&sdata->u.ibss.mtx);
1210
1211         mutex_lock(&local->mtx);
1212         ieee80211_recalc_idle(sdata->local);
1213         mutex_unlock(&local->mtx);
1214
1215         return 0;
1216 }