net/mac80211/ibss.c

   1 /*
   2  * IBSS mode implementation
   3  * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
   4  * Copyright 2004, Instant802 Networks, Inc.
   5  * Copyright 2005, Devicescape Software, Inc.
   6  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   7  * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
   8  * Copyright 2009, Johannes Berg <johannes@sipsolutions.net>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2 as
  12  * published by the Free Software Foundation.
  13  */
  14
  15 #include <linux/delay.h>
  16 #include <linux/slab.h>
  17 #include <linux/if_ether.h>
  18 #include <linux/skbuff.h>
  19 #include <linux/if_arp.h>
  20 #include <linux/etherdevice.h>
  21 #include <linux/rtnetlink.h>
  22 #include <net/mac80211.h>
  23
  24 #include "ieee80211_i.h"
  25 #include "driver-ops.h"
  26 #include "rate.h"
  27
  28 #define IEEE80211_SCAN_INTERVAL (2 * HZ)
  29 #define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ)
  30
  31 #define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ)
  32 #define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ)
  33
  34 #define IEEE80211_IBSS_MAX_STA_ENTRIES 128
  35
  36
  37 static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
  38                                       const u8 *bssid, const int beacon_int,
  39                                       struct ieee80211_channel *chan,
  40                                       const u32 basic_rates,
  41                                       const u16 capability, u64 tsf,
  42                                       bool creator)
  43 {
  44         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
  45         struct ieee80211_local *local = sdata->local;
  46         int rates, i;
  47         struct 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                 sdata->vif.bss_conf.ibss_creator = false;
  76                 netif_carrier_off(sdata->dev);
  77                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_IBSS);
  78         }
  79
  80         sdata->drop_unencrypted = capability & WLAN_CAPABILITY_PRIVACY ? 1 : 0;
  81
  82         channel_type = ifibss->channel_type;
  83         if (!cfg80211_can_beacon_sec_chan(local->hw.wiphy, chan, channel_type))
  84                 channel_type = NL80211_CHAN_HT20;
  85
  86         ieee80211_vif_release_channel(sdata);
  87         if (ieee80211_vif_use_channel(sdata, chan, channel_type,
  88                                       ifibss->fixed_channel ?
  89                                         IEEE80211_CHANCTX_SHARED :
  90                                         IEEE80211_CHANCTX_EXCLUSIVE)) {
  91                 sdata_info(sdata, "Failed to join IBSS, no channel context\n");
  92                 return;
  93         }
  94
  95         memcpy(ifibss->bssid, bssid, ETH_ALEN);
  96
  97         sband = local->hw.wiphy->bands[chan->band];
  98
  99         /* build supported rates array */
 100         pos = supp_rates;
 101         for (i = 0; i < sband->n_bitrates; i++) {
 102                 int rate = sband->bitrates[i].bitrate;
 103                 u8 basic = 0;
 104                 if (basic_rates & BIT(i))
 105                         basic = 0x80;
 106                 *pos++ = basic | (u8) (rate / 5);
 107         }
 108
 109         /* Build IBSS probe response */
 110         mgmt = (void *) skb_put(skb, 24 + sizeof(mgmt->u.beacon));
 111         memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
 112         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 113                                           IEEE80211_STYPE_PROBE_RESP);
 114         eth_broadcast_addr(mgmt->da);
 115         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 116         memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN);
 117         mgmt->u.beacon.beacon_int = cpu_to_le16(beacon_int);
 118         mgmt->u.beacon.timestamp = cpu_to_le64(tsf);
 119         mgmt->u.beacon.capab_info = cpu_to_le16(capability);
 120
 121         pos = skb_put(skb, 2 + ifibss->ssid_len);
 122         *pos++ = WLAN_EID_SSID;
 123         *pos++ = ifibss->ssid_len;
 124         memcpy(pos, ifibss->ssid, ifibss->ssid_len);
 125
 126         rates = sband->n_bitrates;
 127         if (rates > 8)
 128                 rates = 8;
 129         pos = skb_put(skb, 2 + rates);
 130         *pos++ = WLAN_EID_SUPP_RATES;
 131         *pos++ = rates;
 132         memcpy(pos, supp_rates, rates);
 133
 134         if (sband->band == IEEE80211_BAND_2GHZ) {
 135                 pos = skb_put(skb, 2 + 1);
 136                 *pos++ = WLAN_EID_DS_PARAMS;
 137                 *pos++ = 1;
 138                 *pos++ = ieee80211_frequency_to_channel(chan->center_freq);
 139         }
 140
 141         pos = skb_put(skb, 2 + 2);
 142         *pos++ = WLAN_EID_IBSS_PARAMS;
 143         *pos++ = 2;
 144         /* FIX: set ATIM window based on scan results */
 145         *pos++ = 0;
 146         *pos++ = 0;
 147
 148         if (sband->n_bitrates > 8) {
 149                 rates = sband->n_bitrates - 8;
 150                 pos = skb_put(skb, 2 + rates);
 151                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 152                 *pos++ = rates;
 153                 memcpy(pos, &supp_rates[8], rates);
 154         }
 155
 156         if (ifibss->ie_len)
 157                 memcpy(skb_put(skb, ifibss->ie_len),
 158                        ifibss->ie, ifibss->ie_len);
 159
 160         /* add HT capability and information IEs */
 161         if (channel_type && sband->ht_cap.ht_supported) {
 162                 pos = skb_put(skb, 4 +
 163                                    sizeof(struct ieee80211_ht_cap) +
 164                                    sizeof(struct ieee80211_ht_operation));
 165                 pos = ieee80211_ie_build_ht_cap(pos, &sband->ht_cap,
 166                                                 sband->ht_cap.cap);
 167                 /*
 168                  * Note: According to 802.11n-2009 9.13.3.1, HT Protection
 169                  * field and RIFS Mode are reserved in IBSS mode, therefore
 170                  * keep them at 0
 171                  */
 172                 pos = ieee80211_ie_build_ht_oper(pos, &sband->ht_cap,
 173                                                  chan, channel_type, 0);
 174         }
 175
 176         if (local->hw.queues >= IEEE80211_NUM_ACS) {
 177                 pos = skb_put(skb, 9);
 178                 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
 179                 *pos++ = 7; /* len */
 180                 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
 181                 *pos++ = 0x50;
 182                 *pos++ = 0xf2;
 183                 *pos++ = 2; /* WME */
 184                 *pos++ = 0; /* WME info */
 185                 *pos++ = 1; /* WME ver */
 186                 *pos++ = 0; /* U-APSD no in use */
 187         }
 188
 189         rcu_assign_pointer(ifibss->presp, skb);
 190
 191         sdata->vif.bss_conf.beacon_int = beacon_int;
 192         sdata->vif.bss_conf.basic_rates = basic_rates;
 193         bss_change = BSS_CHANGED_BEACON_INT;
 194         bss_change |= ieee80211_reset_erp_info(sdata);
 195         bss_change |= BSS_CHANGED_BSSID;
 196         bss_change |= BSS_CHANGED_BEACON;
 197         bss_change |= BSS_CHANGED_BEACON_ENABLED;
 198         bss_change |= BSS_CHANGED_BASIC_RATES;
 199         bss_change |= BSS_CHANGED_HT;
 200         bss_change |= BSS_CHANGED_IBSS;
 201         sdata->vif.bss_conf.ibss_joined = true;
 202         sdata->vif.bss_conf.ibss_creator = creator;
 203         ieee80211_bss_info_change_notify(sdata, bss_change);
 204
 205         ieee80211_sta_def_wmm_params(sdata, sband->n_bitrates, supp_rates);
 206
 207         ifibss->state = IEEE80211_IBSS_MLME_JOINED;
 208         mod_timer(&ifibss->timer,
 209                   round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
 210
 211         bss = cfg80211_inform_bss_frame(local->hw.wiphy, chan,
 212                                         mgmt, skb->len, 0, GFP_KERNEL);
 213         cfg80211_put_bss(bss);
 214         netif_carrier_on(sdata->dev);
 215         cfg80211_ibss_joined(sdata->dev, ifibss->bssid, GFP_KERNEL);
 216 }
 217
 218 static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
 219                                     struct ieee80211_bss *bss)
 220 {
 221         struct cfg80211_bss *cbss =
 222                 container_of((void *)bss, struct cfg80211_bss, priv);
 223         struct ieee80211_supported_band *sband;
 224         u32 basic_rates;
 225         int i, j;
 226         u16 beacon_int = cbss->beacon_interval;
 227
 228         lockdep_assert_held(&sdata->u.ibss.mtx);
 229
 230         if (beacon_int < 10)
 231                 beacon_int = 10;
 232
 233         sband = sdata->local->hw.wiphy->bands[cbss->channel->band];
 234
 235         basic_rates = 0;
 236
 237         for (i = 0; i < bss->supp_rates_len; i++) {
 238                 int rate = (bss->supp_rates[i] & 0x7f) * 5;
 239                 bool is_basic = !!(bss->supp_rates[i] & 0x80);
 240
 241                 for (j = 0; j < sband->n_bitrates; j++) {
 242                         if (sband->bitrates[j].bitrate == rate) {
 243                                 if (is_basic)
 244                                         basic_rates |= BIT(j);
 245                                 break;
 246                         }
 247                 }
 248         }
 249
 250         __ieee80211_sta_join_ibss(sdata, cbss->bssid,
 251                                   beacon_int,
 252                                   cbss->channel,
 253                                   basic_rates,
 254                                   cbss->capability,
 255                                   cbss->tsf,
 256                                   false);
 257 }
 258
 259 static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta,
 260                                                   bool auth)
 261         __acquires(RCU)
 262 {
 263         struct ieee80211_sub_if_data *sdata = sta->sdata;
 264         u8 addr[ETH_ALEN];
 265
 266         memcpy(addr, sta->sta.addr, ETH_ALEN);
 267
 268         ibss_dbg(sdata, "Adding new IBSS station %pM\n", addr);
 269
 270         sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
 271         sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
 272         /* authorize the station only if the network is not RSN protected. If
 273          * not wait for the userspace to authorize it */
 274         if (!sta->sdata->u.ibss.control_port)
 275                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
 276
 277         rate_control_rate_init(sta);
 278
 279         /* If it fails, maybe we raced another insertion? */
 280         if (sta_info_insert_rcu(sta))
 281                 return sta_info_get(sdata, addr);
 282         if (auth && !sdata->u.ibss.auth_frame_registrations) {
 283                 ibss_dbg(sdata,
 284                          "TX Auth SA=%pM DA=%pM BSSID=%pM (auth_transaction=1)\n",
 285                          sdata->vif.addr, addr, sdata->u.ibss.bssid);
 286                 ieee80211_send_auth(sdata, 1, WLAN_AUTH_OPEN, 0, NULL, 0,
 287                                     addr, sdata->u.ibss.bssid, NULL, 0, 0);
 288         }
 289         return sta;
 290 }
 291
 292 static struct sta_info *
 293 ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata,
 294                        const u8 *bssid, const u8 *addr,
 295                        u32 supp_rates, bool auth)
 296         __acquires(RCU)
 297 {
 298         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 299         struct ieee80211_local *local = sdata->local;
 300         struct sta_info *sta;
 301         struct ieee80211_chanctx_conf *chanctx_conf;
 302         int band;
 303
 304         /*
 305          * XXX: Consider removing the least recently used entry and
 306          *      allow new one to be added.
 307          */
 308         if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
 309                 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
 310                                     sdata->name, addr);
 311                 rcu_read_lock();
 312                 return NULL;
 313         }
 314
 315         if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) {
 316                 rcu_read_lock();
 317                 return NULL;
 318         }
 319
 320         if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) {
 321                 rcu_read_lock();
 322                 return NULL;
 323         }
 324
 325         rcu_read_lock();
 326         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 327         if (WARN_ON_ONCE(!chanctx_conf))
 328                 return NULL;
 329         band = chanctx_conf->channel->band;
 330         rcu_read_unlock();
 331
 332         sta = sta_info_alloc(sdata, addr, GFP_KERNEL);
 333         if (!sta) {
 334                 rcu_read_lock();
 335                 return NULL;
 336         }
 337
 338         sta->last_rx = jiffies;
 339
 340         /* make sure mandatory rates are always added */
 341         sta->sta.supp_rates[band] = supp_rates |
 342                         ieee80211_mandatory_rates(local, band);
 343
 344         return ieee80211_ibss_finish_sta(sta, auth);
 345 }
 346
 347 static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data *sdata,
 348                                           struct ieee80211_mgmt *mgmt,
 349                                           size_t len)
 350 {
 351         u16 reason = le16_to_cpu(mgmt->u.deauth.reason_code);
 352
 353         if (len < IEEE80211_DEAUTH_FRAME_LEN)
 354                 return;
 355
 356         ibss_dbg(sdata, "RX DeAuth SA=%pM DA=%pM BSSID=%pM (reason: %d)\n",
 357                  mgmt->sa, mgmt->da, mgmt->bssid, reason);
 358         sta_info_destroy_addr(sdata, mgmt->sa);
 359 }
 360
 361 static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata,
 362                                         struct ieee80211_mgmt *mgmt,
 363                                         size_t len)
 364 {
 365         u16 auth_alg, auth_transaction;
 366         struct sta_info *sta;
 367         u8 deauth_frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
 368
 369         lockdep_assert_held(&sdata->u.ibss.mtx);
 370
 371         if (len < 24 + 6)
 372                 return;
 373
 374         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
 375         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
 376
 377         if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
 378                 return;
 379         ibss_dbg(sdata,
 380                  "RX Auth SA=%pM DA=%pM BSSID=%pM (auth_transaction=%d)\n",
 381                  mgmt->sa, mgmt->da, mgmt->bssid, auth_transaction);
 382         sta_info_destroy_addr(sdata, mgmt->sa);
 383         sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, 0, false);
 384         rcu_read_unlock();
 385
 386         /*
 387          * if we have any problem in allocating the new station, we reply with a
 388          * DEAUTH frame to tell the other end that we had a problem
 389          */
 390         if (!sta) {
 391                 ieee80211_send_deauth_disassoc(sdata, sdata->u.ibss.bssid,
 392                                                IEEE80211_STYPE_DEAUTH,
 393                                                WLAN_REASON_UNSPECIFIED, true,
 394                                                deauth_frame_buf);
 395                 return;
 396         }
 397
 398         /*
 399          * IEEE 802.11 standard does not require authentication in IBSS
 400          * networks and most implementations do not seem to use it.
 401          * However, try to reply to authentication attempts if someone
 402          * has actually implemented this.
 403          */
 404         ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, 0, NULL, 0,
 405                             mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0);
 406 }
 407
 408 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
 409                                   struct ieee80211_mgmt *mgmt,
 410                                   size_t len,
 411                                   struct ieee80211_rx_status *rx_status,
 412                                   struct ieee802_11_elems *elems,
 413                                   bool beacon)
 414 {
 415         struct ieee80211_local *local = sdata->local;
 416         int freq;
 417         struct cfg80211_bss *cbss;
 418         struct ieee80211_bss *bss;
 419         struct sta_info *sta;
 420         struct ieee80211_channel *channel;
 421         u64 beacon_timestamp, rx_timestamp;
 422         u32 supp_rates = 0;
 423         enum ieee80211_band band = rx_status->band;
 424         struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band];
 425         bool rates_updated = false;
 426
 427         if (elems->ds_params && elems->ds_params_len == 1)
 428                 freq = ieee80211_channel_to_frequency(elems->ds_params[0],
 429                                                       band);
 430         else
 431                 freq = rx_status->freq;
 432
 433         channel = ieee80211_get_channel(local->hw.wiphy, freq);
 434
 435         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
 436                 return;
 437
 438         if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
 439             ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid)) {
 440
 441                 rcu_read_lock();
 442                 sta = sta_info_get(sdata, mgmt->sa);
 443
 444                 if (elems->supp_rates) {
 445                         supp_rates = ieee80211_sta_get_rates(local, elems,
 446                                                              band, NULL);
 447                         if (sta) {
 448                                 u32 prev_rates;
 449
 450                                 prev_rates = sta->sta.supp_rates[band];
 451                                 /* make sure mandatory rates are always added */
 452                                 sta->sta.supp_rates[band] = supp_rates |
 453                                         ieee80211_mandatory_rates(local, band);
 454
 455                                 if (sta->sta.supp_rates[band] != prev_rates) {
 456                                         ibss_dbg(sdata,
 457                                                  "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n",
 458                                                  sta->sta.addr, prev_rates,
 459                                                  sta->sta.supp_rates[band]);
 460                                         rates_updated = true;
 461                                 }
 462                         } else {
 463                                 rcu_read_unlock();
 464                                 sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid,
 465                                                 mgmt->sa, supp_rates, true);
 466                         }
 467                 }
 468
 469                 if (sta && elems->wmm_info)
 470                         set_sta_flag(sta, WLAN_STA_WME);
 471
 472                 if (sta && elems->ht_operation && elems->ht_cap_elem &&
 473                     sdata->u.ibss.channel_type != NL80211_CHAN_NO_HT) {
 474                         /* we both use HT */
 475                         struct ieee80211_sta_ht_cap sta_ht_cap_new;
 476                         enum nl80211_channel_type channel_type =
 477                                 ieee80211_ht_oper_to_channel_type(
 478                                                         elems->ht_operation);
 479
 480                         ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
 481                                                           elems->ht_cap_elem,
 482                                                           &sta_ht_cap_new);
 483
 484                         /*
 485                          * fall back to HT20 if we don't use or use
 486                          * the other extension channel
 487                          */
 488                         if (!(channel_type == NL80211_CHAN_HT40MINUS ||
 489                               channel_type == NL80211_CHAN_HT40PLUS) ||
 490                             channel_type != sdata->u.ibss.channel_type)
 491                                 sta_ht_cap_new.cap &=
 492                                         ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 493
 494                         if (memcmp(&sta->sta.ht_cap, &sta_ht_cap_new,
 495                                    sizeof(sta_ht_cap_new))) {
 496                                 memcpy(&sta->sta.ht_cap, &sta_ht_cap_new,
 497                                        sizeof(sta_ht_cap_new));
 498                                 rates_updated = true;
 499                         }
 500                 }
 501
 502                 if (sta && rates_updated) {
 503                         drv_sta_rc_update(local, sdata, &sta->sta,
 504                                           IEEE80211_RC_SUPP_RATES_CHANGED);
 505                         rate_control_rate_init(sta);
 506                 }
 507
 508                 rcu_read_unlock();
 509         }
 510
 511         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
 512                                         channel, beacon);
 513         if (!bss)
 514                 return;
 515
 516         cbss = container_of((void *)bss, struct cfg80211_bss, priv);
 517
 518         /* was just updated in ieee80211_bss_info_update */
 519         beacon_timestamp = cbss->tsf;
 520
 521         /* check if we need to merge IBSS */
 522
 523         /* we use a fixed BSSID */
 524         if (sdata->u.ibss.fixed_bssid)
 525                 goto put_bss;
 526
 527         /* not an IBSS */
 528         if (!(cbss->capability & WLAN_CAPABILITY_IBSS))
 529                 goto put_bss;
 530
 531         /* different channel */
 532         if (sdata->u.ibss.fixed_channel &&
 533             sdata->u.ibss.channel != cbss->channel)
 534                 goto put_bss;
 535
 536         /* different SSID */
 537         if (elems->ssid_len != sdata->u.ibss.ssid_len ||
 538             memcmp(elems->ssid, sdata->u.ibss.ssid,
 539                                 sdata->u.ibss.ssid_len))
 540                 goto put_bss;
 541
 542         /* same BSSID */
 543         if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid))
 544                 goto put_bss;
 545
 546         if (rx_status->flag & RX_FLAG_MACTIME_MPDU) {
 547                 /*
 548                  * For correct IBSS merging we need mactime; since mactime is
 549                  * defined as the time the first data symbol of the frame hits
 550                  * the PHY, and the timestamp of the beacon is defined as "the
 551                  * time that the data symbol containing the first bit of the
 552                  * timestamp is transmitted to the PHY plus the transmitting
 553                  * STA's delays through its local PHY from the MAC-PHY
 554                  * interface to its interface with the WM" (802.11 11.1.2)
 555                  * - equals the time this bit arrives at the receiver - we have
 556                  * to take into account the offset between the two.
 557                  *
 558                  * E.g. at 1 MBit that means mactime is 192 usec earlier
 559                  * (=24 bytes * 8 usecs/byte) than the beacon timestamp.
 560                  */
 561                 int rate;
 562
 563                 if (rx_status->flag & RX_FLAG_HT)
 564                         rate = 65; /* TODO: HT rates */
 565                 else
 566                         rate = local->hw.wiphy->bands[band]->
 567                                 bitrates[rx_status->rate_idx].bitrate;
 568
 569                 rx_timestamp = rx_status->mactime + (24 * 8 * 10 / rate);
 570         } else {
 571                 /*
 572                  * second best option: get current TSF
 573                  * (will return -1 if not supported)
 574                  */
 575                 rx_timestamp = drv_get_tsf(local, sdata);
 576         }
 577
 578         ibss_dbg(sdata,
 579                  "RX beacon SA=%pM BSSID=%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
 580                  mgmt->sa, mgmt->bssid,
 581                  (unsigned long long)rx_timestamp,
 582                  (unsigned long long)beacon_timestamp,
 583                  (unsigned long long)(rx_timestamp - beacon_timestamp),
 584                  jiffies);
 585
 586         if (beacon_timestamp > rx_timestamp) {
 587                 ibss_dbg(sdata,
 588                          "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n",
 589                          mgmt->bssid);
 590                 ieee80211_sta_join_ibss(sdata, bss);
 591                 supp_rates = ieee80211_sta_get_rates(local, elems, band, NULL);
 592                 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa,
 593                                        supp_rates, true);
 594                 rcu_read_unlock();
 595         }
 596
 597  put_bss:
 598         ieee80211_rx_bss_put(local, bss);
 599 }
 600
 601 void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata,
 602                               const u8 *bssid, const u8 *addr,
 603                               u32 supp_rates)
 604 {
 605         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 606         struct ieee80211_local *local = sdata->local;
 607         struct sta_info *sta;
 608         struct ieee80211_chanctx_conf *chanctx_conf;
 609         int band;
 610
 611         /*
 612          * XXX: Consider removing the least recently used entry and
 613          *      allow new one to be added.
 614          */
 615         if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
 616                 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
 617                                     sdata->name, addr);
 618                 return;
 619         }
 620
 621         if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH)
 622                 return;
 623
 624         if (!ether_addr_equal(bssid, sdata->u.ibss.bssid))
 625                 return;
 626
 627         rcu_read_lock();
 628         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 629         if (WARN_ON_ONCE(!chanctx_conf)) {
 630                 rcu_read_unlock();
 631                 return;
 632         }
 633         band = chanctx_conf->channel->band;
 634         rcu_read_unlock();
 635
 636         sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
 637         if (!sta)
 638                 return;
 639
 640         sta->last_rx = jiffies;
 641
 642         /* make sure mandatory rates are always added */
 643         sta->sta.supp_rates[band] = supp_rates |
 644                         ieee80211_mandatory_rates(local, band);
 645
 646         spin_lock(&ifibss->incomplete_lock);
 647         list_add(&sta->list, &ifibss->incomplete_stations);
 648         spin_unlock(&ifibss->incomplete_lock);
 649         ieee80211_queue_work(&local->hw, &sdata->work);
 650 }
 651
 652 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
 653 {
 654         struct ieee80211_local *local = sdata->local;
 655         int active = 0;
 656         struct sta_info *sta;
 657
 658         lockdep_assert_held(&sdata->u.ibss.mtx);
 659
 660         rcu_read_lock();
 661
 662         list_for_each_entry_rcu(sta, &local->sta_list, list) {
 663                 if (sta->sdata == sdata &&
 664                     time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
 665                                jiffies)) {
 666                         active++;
 667                         break;
 668                 }
 669         }
 670
 671         rcu_read_unlock();
 672
 673         return active;
 674 }
 675
 676 /*
 677  * This function is called with state == IEEE80211_IBSS_MLME_JOINED
 678  */
 679
 680 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
 681 {
 682         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 683
 684         lockdep_assert_held(&ifibss->mtx);
 685
 686         mod_timer(&ifibss->timer,
 687                   round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
 688
 689         ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT);
 690
 691         if (time_before(jiffies, ifibss->last_scan_completed +
 692                        IEEE80211_IBSS_MERGE_INTERVAL))
 693                 return;
 694
 695         if (ieee80211_sta_active_ibss(sdata))
 696                 return;
 697
 698         if (ifibss->fixed_channel)
 699                 return;
 700
 701         sdata_info(sdata,
 702                    "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n");
 703
 704         ieee80211_request_internal_scan(sdata,
 705                         ifibss->ssid, ifibss->ssid_len, NULL);
 706 }
 707
 708 static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
 709 {
 710         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 711         u8 bssid[ETH_ALEN];
 712         u16 capability;
 713         int i;
 714
 715         lockdep_assert_held(&ifibss->mtx);
 716
 717         if (ifibss->fixed_bssid) {
 718                 memcpy(bssid, ifibss->bssid, ETH_ALEN);
 719         } else {
 720                 /* Generate random, not broadcast, locally administered BSSID. Mix in
 721                  * own MAC address to make sure that devices that do not have proper
 722                  * random number generator get different BSSID. */
 723                 get_random_bytes(bssid, ETH_ALEN);
 724                 for (i = 0; i < ETH_ALEN; i++)
 725                         bssid[i] ^= sdata->vif.addr[i];
 726                 bssid[0] &= ~0x01;
 727                 bssid[0] |= 0x02;
 728         }
 729
 730         sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid);
 731
 732         capability = WLAN_CAPABILITY_IBSS;
 733
 734         if (ifibss->privacy)
 735                 capability |= WLAN_CAPABILITY_PRIVACY;
 736         else
 737                 sdata->drop_unencrypted = 0;
 738
 739         __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int,
 740                                   ifibss->channel, ifibss->basic_rates,
 741                                   capability, 0, true);
 742 }
 743
 744 /*
 745  * This function is called with state == IEEE80211_IBSS_MLME_SEARCH
 746  */
 747
 748 static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
 749 {
 750         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 751         struct ieee80211_local *local = sdata->local;
 752         struct cfg80211_bss *cbss;
 753         struct ieee80211_channel *chan = NULL;
 754         const u8 *bssid = NULL;
 755         int active_ibss;
 756         u16 capability;
 757
 758         lockdep_assert_held(&ifibss->mtx);
 759
 760         active_ibss = ieee80211_sta_active_ibss(sdata);
 761         ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss);
 762
 763         if (active_ibss)
 764                 return;
 765
 766         capability = WLAN_CAPABILITY_IBSS;
 767         if (ifibss->privacy)
 768                 capability |= WLAN_CAPABILITY_PRIVACY;
 769         if (ifibss->fixed_bssid)
 770                 bssid = ifibss->bssid;
 771         if (ifibss->fixed_channel)
 772                 chan = ifibss->channel;
 773         if (!is_zero_ether_addr(ifibss->bssid))
 774                 bssid = ifibss->bssid;
 775         cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid,
 776                                 ifibss->ssid, ifibss->ssid_len,
 777                                 WLAN_CAPABILITY_IBSS | WLAN_CAPABILITY_PRIVACY,
 778                                 capability);
 779
 780         if (cbss) {
 781                 struct ieee80211_bss *bss;
 782
 783                 bss = (void *)cbss->priv;
 784                 ibss_dbg(sdata,
 785                          "sta_find_ibss: selected %pM current %pM\n",
 786                          cbss->bssid, ifibss->bssid);
 787                 sdata_info(sdata,
 788                            "Selected IBSS BSSID %pM based on configured SSID\n",
 789                            cbss->bssid);
 790
 791                 ieee80211_sta_join_ibss(sdata, bss);
 792                 ieee80211_rx_bss_put(local, bss);
 793                 return;
 794         }
 795
 796         ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n");
 797
 798         /* Selected IBSS not found in current scan results - try to scan */
 799         if (time_after(jiffies, ifibss->last_scan_completed +
 800                                         IEEE80211_SCAN_INTERVAL)) {
 801                 sdata_info(sdata, "Trigger new scan to find an IBSS to join\n");
 802
 803                 ieee80211_request_internal_scan(sdata,
 804                                 ifibss->ssid, ifibss->ssid_len,
 805                                 ifibss->fixed_channel ? ifibss->channel : NULL);
 806         } else {
 807                 int interval = IEEE80211_SCAN_INTERVAL;
 808
 809                 if (time_after(jiffies, ifibss->ibss_join_req +
 810                                IEEE80211_IBSS_JOIN_TIMEOUT))
 811                         ieee80211_sta_create_ibss(sdata);
 812
 813                 mod_timer(&ifibss->timer,
 814                           round_jiffies(jiffies + interval));
 815         }
 816 }
 817
 818 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
 819                                         struct sk_buff *req)
 820 {
 821         struct ieee80211_mgmt *mgmt = (void *)req->data;
 822         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 823         struct ieee80211_local *local = sdata->local;
 824         int tx_last_beacon, len = req->len;
 825         struct sk_buff *skb;
 826         struct ieee80211_mgmt *resp;
 827         struct sk_buff *presp;
 828         u8 *pos, *end;
 829
 830         lockdep_assert_held(&ifibss->mtx);
 831
 832         presp = rcu_dereference_protected(ifibss->presp,
 833                                           lockdep_is_held(&ifibss->mtx));
 834
 835         if (ifibss->state != IEEE80211_IBSS_MLME_JOINED ||
 836             len < 24 + 2 || !presp)
 837                 return;
 838
 839         tx_last_beacon = drv_tx_last_beacon(local);
 840
 841         ibss_dbg(sdata,
 842                  "RX ProbeReq SA=%pM DA=%pM BSSID=%pM (tx_last_beacon=%d)\n",
 843                  mgmt->sa, mgmt->da, mgmt->bssid, tx_last_beacon);
 844
 845         if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da))
 846                 return;
 847
 848         if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) &&
 849             !is_broadcast_ether_addr(mgmt->bssid))
 850                 return;
 851
 852         end = ((u8 *) mgmt) + len;
 853         pos = mgmt->u.probe_req.variable;
 854         if (pos[0] != WLAN_EID_SSID ||
 855             pos + 2 + pos[1] > end) {
 856                 ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n",
 857                          mgmt->sa);
 858                 return;
 859         }
 860         if (pos[1] != 0 &&
 861             (pos[1] != ifibss->ssid_len ||
 862              memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) {
 863                 /* Ignore ProbeReq for foreign SSID */
 864                 return;
 865         }
 866
 867         /* Reply with ProbeResp */
 868         skb = skb_copy(presp, GFP_KERNEL);
 869         if (!skb)
 870                 return;
 871
 872         resp = (struct ieee80211_mgmt *) skb->data;
 873         memcpy(resp->da, mgmt->sa, ETH_ALEN);
 874         ibss_dbg(sdata, "Sending ProbeResp to %pM\n", resp->da);
 875         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 876         ieee80211_tx_skb(sdata, skb);
 877 }
 878
 879 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
 880                                          struct ieee80211_mgmt *mgmt,
 881                                          size_t len,
 882                                          struct ieee80211_rx_status *rx_status)
 883 {
 884         size_t baselen;
 885         struct ieee802_11_elems elems;
 886
 887         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
 888         if (baselen > len)
 889                 return;
 890
 891         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
 892                                 &elems);
 893
 894         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
 895 }
 896
 897 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
 898                                      struct ieee80211_mgmt *mgmt,
 899                                      size_t len,
 900                                      struct ieee80211_rx_status *rx_status)
 901 {
 902         size_t baselen;
 903         struct ieee802_11_elems elems;
 904
 905         /* Process beacon from the current BSS */
 906         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
 907         if (baselen > len)
 908                 return;
 909
 910         ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems);
 911
 912         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true);
 913 }
 914
 915 void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
 916                                    struct sk_buff *skb)
 917 {
 918         struct ieee80211_rx_status *rx_status;
 919         struct ieee80211_mgmt *mgmt;
 920         u16 fc;
 921
 922         rx_status = IEEE80211_SKB_RXCB(skb);
 923         mgmt = (struct ieee80211_mgmt *) skb->data;
 924         fc = le16_to_cpu(mgmt->frame_control);
 925
 926         mutex_lock(&sdata->u.ibss.mtx);
 927
 928         if (!sdata->u.ibss.ssid_len)
 929                 goto mgmt_out; /* not ready to merge yet */
 930
 931         switch (fc & IEEE80211_FCTL_STYPE) {
 932         case IEEE80211_STYPE_PROBE_REQ:
 933                 ieee80211_rx_mgmt_probe_req(sdata, skb);
 934                 break;
 935         case IEEE80211_STYPE_PROBE_RESP:
 936                 ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len,
 937                                              rx_status);
 938                 break;
 939         case IEEE80211_STYPE_BEACON:
 940                 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
 941                                          rx_status);
 942                 break;
 943         case IEEE80211_STYPE_AUTH:
 944                 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len);
 945                 break;
 946         case IEEE80211_STYPE_DEAUTH:
 947                 ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len);
 948                 break;
 949         }
 950
 951  mgmt_out:
 952         mutex_unlock(&sdata->u.ibss.mtx);
 953 }
 954
 955 void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata)
 956 {
 957         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 958         struct sta_info *sta;
 959
 960         mutex_lock(&ifibss->mtx);
 961
 962         /*
 963          * Work could be scheduled after scan or similar
 964          * when we aren't even joined (or trying) with a
 965          * network.
 966          */
 967         if (!ifibss->ssid_len)
 968                 goto out;
 969
 970         spin_lock_bh(&ifibss->incomplete_lock);
 971         while (!list_empty(&ifibss->incomplete_stations)) {
 972                 sta = list_first_entry(&ifibss->incomplete_stations,
 973                                        struct sta_info, list);
 974                 list_del(&sta->list);
 975                 spin_unlock_bh(&ifibss->incomplete_lock);
 976
 977                 ieee80211_ibss_finish_sta(sta, true);
 978                 rcu_read_unlock();
 979                 spin_lock_bh(&ifibss->incomplete_lock);
 980         }
 981         spin_unlock_bh(&ifibss->incomplete_lock);
 982
 983         switch (ifibss->state) {
 984         case IEEE80211_IBSS_MLME_SEARCH:
 985                 ieee80211_sta_find_ibss(sdata);
 986                 break;
 987         case IEEE80211_IBSS_MLME_JOINED:
 988                 ieee80211_sta_merge_ibss(sdata);
 989                 break;
 990         default:
 991                 WARN_ON(1);
 992                 break;
 993         }
 994
 995  out:
 996         mutex_unlock(&ifibss->mtx);
 997 }
 998
 999 static void ieee80211_ibss_timer(unsigned long data)
1000 {
1001         struct ieee80211_sub_if_data *sdata =
1002                 (struct ieee80211_sub_if_data *) data;
1003         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1004         struct ieee80211_local *local = sdata->local;
1005
1006         if (local->quiescing) {
1007                 ifibss->timer_running = true;
1008                 return;
1009         }
1010
1011         ieee80211_queue_work(&local->hw, &sdata->work);
1012 }
1013
1014 #ifdef CONFIG_PM
1015 void ieee80211_ibss_quiesce(struct ieee80211_sub_if_data *sdata)
1016 {
1017         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1018
1019         if (del_timer_sync(&ifibss->timer))
1020                 ifibss->timer_running = true;
1021 }
1022
1023 void ieee80211_ibss_restart(struct ieee80211_sub_if_data *sdata)
1024 {
1025         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1026
1027         if (ifibss->timer_running) {
1028                 add_timer(&ifibss->timer);
1029                 ifibss->timer_running = false;
1030         }
1031 }
1032 #endif
1033
1034 void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata)
1035 {
1036         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1037
1038         setup_timer(&ifibss->timer, ieee80211_ibss_timer,
1039                     (unsigned long) sdata);
1040         mutex_init(&ifibss->mtx);
1041         INIT_LIST_HEAD(&ifibss->incomplete_stations);
1042         spin_lock_init(&ifibss->incomplete_lock);
1043 }
1044
1045 /* scan finished notification */
1046 void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local)
1047 {
1048         struct ieee80211_sub_if_data *sdata;
1049
1050         mutex_lock(&local->iflist_mtx);
1051         list_for_each_entry(sdata, &local->interfaces, list) {
1052                 if (!ieee80211_sdata_running(sdata))
1053                         continue;
1054                 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
1055                         continue;
1056                 sdata->u.ibss.last_scan_completed = jiffies;
1057                 ieee80211_queue_work(&local->hw, &sdata->work);
1058         }
1059         mutex_unlock(&local->iflist_mtx);
1060 }
1061
1062 int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
1063                         struct cfg80211_ibss_params *params)
1064 {
1065         struct sk_buff *skb;
1066         u32 changed = 0;
1067
1068         skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom +
1069                             sizeof(struct ieee80211_hdr_3addr) +
1070                             12 /* struct ieee80211_mgmt.u.beacon */ +
1071                             2 + IEEE80211_MAX_SSID_LEN /* max SSID */ +
1072                             2 + 8 /* max Supported Rates */ +
1073                             3 /* max DS params */ +
1074                             4 /* IBSS params */ +
1075                             2 + (IEEE80211_MAX_SUPP_RATES - 8) +
1076                             2 + sizeof(struct ieee80211_ht_cap) +
1077                             2 + sizeof(struct ieee80211_ht_operation) +
1078                             params->ie_len);
1079         if (!skb)
1080                 return -ENOMEM;
1081
1082         mutex_lock(&sdata->u.ibss.mtx);
1083
1084         if (params->bssid) {
1085                 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN);
1086                 sdata->u.ibss.fixed_bssid = true;
1087         } else
1088                 sdata->u.ibss.fixed_bssid = false;
1089
1090         sdata->u.ibss.privacy = params->privacy;
1091         sdata->u.ibss.control_port = params->control_port;
1092         sdata->u.ibss.basic_rates = params->basic_rates;
1093         memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate,
1094                sizeof(params->mcast_rate));
1095
1096         sdata->vif.bss_conf.beacon_int = params->beacon_interval;
1097
1098         sdata->u.ibss.channel = params->channel;
1099         sdata->u.ibss.channel_type = params->channel_type;
1100         sdata->u.ibss.fixed_channel = params->channel_fixed;
1101
1102         if (params->ie) {
1103                 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len,
1104                                            GFP_KERNEL);
1105                 if (sdata->u.ibss.ie)
1106                         sdata->u.ibss.ie_len = params->ie_len;
1107         }
1108
1109         sdata->u.ibss.skb = skb;
1110         sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
1111         sdata->u.ibss.ibss_join_req = jiffies;
1112
1113         memcpy(sdata->u.ibss.ssid, params->ssid, IEEE80211_MAX_SSID_LEN);
1114         sdata->u.ibss.ssid_len = params->ssid_len;
1115
1116         mutex_unlock(&sdata->u.ibss.mtx);
1117
1118         mutex_lock(&sdata->local->mtx);
1119         ieee80211_recalc_idle(sdata->local);
1120         mutex_unlock(&sdata->local->mtx);
1121
1122         /*
1123          * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is
1124          * reserved, but an HT STA shall protect HT transmissions as though
1125          * the HT Protection field were set to non-HT mixed mode.
1126          *
1127          * In an IBSS, the RIFS Mode field of the HT Operation element is
1128          * also reserved, but an HT STA shall operate as though this field
1129          * were set to 1.
1130          */
1131
1132         sdata->vif.bss_conf.ht_operation_mode |=
1133                   IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED
1134                 | IEEE80211_HT_PARAM_RIFS_MODE;
1135
1136         changed |= BSS_CHANGED_HT;
1137         ieee80211_bss_info_change_notify(sdata, changed);
1138
1139         sdata->smps_mode = IEEE80211_SMPS_OFF;
1140         sdata->needed_rx_chains = sdata->local->rx_chains;
1141
1142         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1143
1144         return 0;
1145 }
1146
1147 int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata)
1148 {
1149         struct sk_buff *skb;
1150         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1151         struct ieee80211_local *local = sdata->local;
1152         struct cfg80211_bss *cbss;
1153         u16 capability;
1154         int active_ibss;
1155         struct sta_info *sta;
1156
1157         mutex_lock(&sdata->u.ibss.mtx);
1158
1159         sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
1160         memset(sdata->u.ibss.bssid, 0, ETH_ALEN);
1161         sdata->u.ibss.ssid_len = 0;
1162
1163         active_ibss = ieee80211_sta_active_ibss(sdata);
1164
1165         if (!active_ibss && !is_zero_ether_addr(ifibss->bssid)) {
1166                 capability = WLAN_CAPABILITY_IBSS;
1167
1168                 if (ifibss->privacy)
1169                         capability |= WLAN_CAPABILITY_PRIVACY;
1170
1171                 cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->channel,
1172                                         ifibss->bssid, ifibss->ssid,
1173                                         ifibss->ssid_len, WLAN_CAPABILITY_IBSS |
1174                                         WLAN_CAPABILITY_PRIVACY,
1175                                         capability);
1176
1177                 if (cbss) {
1178                         cfg80211_unlink_bss(local->hw.wiphy, cbss);
1179                         cfg80211_put_bss(cbss);
1180                 }
1181         }
1182
1183         sta_info_flush(sdata->local, sdata);
1184
1185         spin_lock_bh(&ifibss->incomplete_lock);
1186         while (!list_empty(&ifibss->incomplete_stations)) {
1187                 sta = list_first_entry(&ifibss->incomplete_stations,
1188                                        struct sta_info, list);
1189                 list_del(&sta->list);
1190                 spin_unlock_bh(&ifibss->incomplete_lock);
1191
1192                 sta_info_free(local, sta);
1193                 spin_lock_bh(&ifibss->incomplete_lock);
1194         }
1195         spin_unlock_bh(&ifibss->incomplete_lock);
1196
1197         netif_carrier_off(sdata->dev);
1198
1199         /* remove beacon */
1200         kfree(sdata->u.ibss.ie);
1201         skb = rcu_dereference_protected(sdata->u.ibss.presp,
1202                                         lockdep_is_held(&sdata->u.ibss.mtx));
1203         RCU_INIT_POINTER(sdata->u.ibss.presp, NULL);
1204         sdata->vif.bss_conf.ibss_joined = false;
1205         sdata->vif.bss_conf.ibss_creator = false;
1206         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED |
1207                                                 BSS_CHANGED_IBSS);
1208         synchronize_rcu();
1209         kfree_skb(skb);
1210
1211         skb_queue_purge(&sdata->skb_queue);
1212
1213         del_timer_sync(&sdata->u.ibss.timer);
1214
1215         mutex_unlock(&sdata->u.ibss.mtx);
1216
1217         mutex_lock(&local->mtx);
1218         ieee80211_recalc_idle(sdata->local);
1219         mutex_unlock(&local->mtx);
1220
1221         return 0;
1222 }