net/mac80211/ibss.c

   1 /*
   2  * IBSS mode implementation
   3  * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
   4  * Copyright 2004, Instant802 Networks, Inc.
   5  * Copyright 2005, Devicescape Software, Inc.
   6  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   7  * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
   8  * Copyright 2009, Johannes Berg <johannes@sipsolutions.net>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2 as
  12  * published by the Free Software Foundation.
  13  */
  14
  15 #include <linux/delay.h>
  16 #include <linux/slab.h>
  17 #include <linux/if_ether.h>
  18 #include <linux/skbuff.h>
  19 #include <linux/if_arp.h>
  20 #include <linux/etherdevice.h>
  21 #include <linux/rtnetlink.h>
  22 #include <net/mac80211.h>
  23
  24 #include "ieee80211_i.h"
  25 #include "driver-ops.h"
  26 #include "rate.h"
  27
  28 #define IEEE80211_SCAN_INTERVAL (2 * HZ)
  29 #define IEEE80211_SCAN_INTERVAL_SLOW (15 * HZ)
  30 #define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ)
  31
  32 #define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ)
  33 #define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ)
  34
  35 #define IEEE80211_IBSS_MAX_STA_ENTRIES 128
  36
  37
  38 static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
  39                                       const u8 *bssid, const int beacon_int,
  40                                       struct ieee80211_channel *chan,
  41                                       const u32 basic_rates,
  42                                       const u16 capability, u64 tsf)
  43 {
  44         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
  45         struct ieee80211_local *local = sdata->local;
  46         int rates, i;
  47         struct sk_buff *skb;
  48         struct ieee80211_mgmt *mgmt;
  49         u8 *pos;
  50         struct ieee80211_supported_band *sband;
  51         struct cfg80211_bss *bss;
  52         u32 bss_change;
  53         u8 supp_rates[IEEE80211_MAX_SUPP_RATES];
  54         enum nl80211_channel_type channel_type;
  55
  56         lockdep_assert_held(&ifibss->mtx);
  57
  58         /* Reset own TSF to allow time synchronization work. */
  59         drv_reset_tsf(local, sdata);
  60
  61         skb = ifibss->skb;
  62         RCU_INIT_POINTER(ifibss->presp, NULL);
  63         synchronize_rcu();
  64         skb->data = skb->head;
  65         skb->len = 0;
  66         skb_reset_tail_pointer(skb);
  67         skb_reserve(skb, sdata->local->hw.extra_tx_headroom);
  68
  69         if (!ether_addr_equal(ifibss->bssid, bssid))
  70                 sta_info_flush(sdata->local, sdata);
  71
  72         /* if merging, indicate to driver that we leave the old IBSS */
  73         if (sdata->vif.bss_conf.ibss_joined) {
  74                 sdata->vif.bss_conf.ibss_joined = false;
  75                 netif_carrier_off(sdata->dev);
  76                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_IBSS);
  77         }
  78
  79         memcpy(ifibss->bssid, bssid, ETH_ALEN);
  80
  81         sdata->drop_unencrypted = capability & WLAN_CAPABILITY_PRIVACY ? 1 : 0;
  82
  83         local->oper_channel = chan;
  84         channel_type = ifibss->channel_type;
  85         if (channel_type > NL80211_CHAN_HT20 &&
  86             !cfg80211_can_beacon_sec_chan(local->hw.wiphy, chan, channel_type))
  87                 channel_type = NL80211_CHAN_HT20;
  88         if (!ieee80211_set_channel_type(local, sdata, channel_type)) {
  89                 /* can only fail due to HT40+/- mismatch */
  90                 channel_type = NL80211_CHAN_HT20;
  91                 WARN_ON(!ieee80211_set_channel_type(local, sdata,
  92                                                     NL80211_CHAN_HT20));
  93         }
  94         ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
  95
  96         sband = local->hw.wiphy->bands[chan->band];
  97
  98         /* build supported rates array */
  99         pos = supp_rates;
 100         for (i = 0; i < sband->n_bitrates; i++) {
 101                 int rate = sband->bitrates[i].bitrate;
 102                 u8 basic = 0;
 103                 if (basic_rates & BIT(i))
 104                         basic = 0x80;
 105                 *pos++ = basic | (u8) (rate / 5);
 106         }
 107
 108         /* Build IBSS probe response */
 109         mgmt = (void *) skb_put(skb, 24 + sizeof(mgmt->u.beacon));
 110         memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
 111         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 112                                           IEEE80211_STYPE_PROBE_RESP);
 113         memset(mgmt->da, 0xff, ETH_ALEN);
 114         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 115         memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN);
 116         mgmt->u.beacon.beacon_int = cpu_to_le16(beacon_int);
 117         mgmt->u.beacon.timestamp = cpu_to_le64(tsf);
 118         mgmt->u.beacon.capab_info = cpu_to_le16(capability);
 119
 120         pos = skb_put(skb, 2 + ifibss->ssid_len);
 121         *pos++ = WLAN_EID_SSID;
 122         *pos++ = ifibss->ssid_len;
 123         memcpy(pos, ifibss->ssid, ifibss->ssid_len);
 124
 125         rates = sband->n_bitrates;
 126         if (rates > 8)
 127                 rates = 8;
 128         pos = skb_put(skb, 2 + rates);
 129         *pos++ = WLAN_EID_SUPP_RATES;
 130         *pos++ = rates;
 131         memcpy(pos, supp_rates, rates);
 132
 133         if (sband->band == IEEE80211_BAND_2GHZ) {
 134                 pos = skb_put(skb, 2 + 1);
 135                 *pos++ = WLAN_EID_DS_PARAMS;
 136                 *pos++ = 1;
 137                 *pos++ = ieee80211_frequency_to_channel(chan->center_freq);
 138         }
 139
 140         pos = skb_put(skb, 2 + 2);
 141         *pos++ = WLAN_EID_IBSS_PARAMS;
 142         *pos++ = 2;
 143         /* FIX: set ATIM window based on scan results */
 144         *pos++ = 0;
 145         *pos++ = 0;
 146
 147         if (sband->n_bitrates > 8) {
 148                 rates = sband->n_bitrates - 8;
 149                 pos = skb_put(skb, 2 + rates);
 150                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 151                 *pos++ = rates;
 152                 memcpy(pos, &supp_rates[8], rates);
 153         }
 154
 155         if (ifibss->ie_len)
 156                 memcpy(skb_put(skb, ifibss->ie_len),
 157                        ifibss->ie, ifibss->ie_len);
 158
 159         /* add HT capability and information IEs */
 160         if (channel_type && sband->ht_cap.ht_supported) {
 161                 pos = skb_put(skb, 4 +
 162                                    sizeof(struct ieee80211_ht_cap) +
 163                                    sizeof(struct ieee80211_ht_operation));
 164                 pos = ieee80211_ie_build_ht_cap(pos, &sband->ht_cap,
 165                                                 sband->ht_cap.cap);
 166                 /*
 167                  * Note: According to 802.11n-2009 9.13.3.1, HT Protection
 168                  * field and RIFS Mode are reserved in IBSS mode, therefore
 169                  * keep them at 0
 170                  */
 171                 pos = ieee80211_ie_build_ht_oper(pos, &sband->ht_cap,
 172                                                  chan, channel_type, 0);
 173         }
 174
 175         if (local->hw.queues >= IEEE80211_NUM_ACS) {
 176                 pos = skb_put(skb, 9);
 177                 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
 178                 *pos++ = 7; /* len */
 179                 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
 180                 *pos++ = 0x50;
 181                 *pos++ = 0xf2;
 182                 *pos++ = 2; /* WME */
 183                 *pos++ = 0; /* WME info */
 184                 *pos++ = 1; /* WME ver */
 185                 *pos++ = 0; /* U-APSD no in use */
 186         }
 187
 188         rcu_assign_pointer(ifibss->presp, skb);
 189
 190         sdata->vif.bss_conf.beacon_int = beacon_int;
 191         sdata->vif.bss_conf.basic_rates = basic_rates;
 192         bss_change = BSS_CHANGED_BEACON_INT;
 193         bss_change |= ieee80211_reset_erp_info(sdata);
 194         bss_change |= BSS_CHANGED_BSSID;
 195         bss_change |= BSS_CHANGED_BEACON;
 196         bss_change |= BSS_CHANGED_BEACON_ENABLED;
 197         bss_change |= BSS_CHANGED_BASIC_RATES;
 198         bss_change |= BSS_CHANGED_HT;
 199         bss_change |= BSS_CHANGED_IBSS;
 200         sdata->vif.bss_conf.ibss_joined = true;
 201         ieee80211_bss_info_change_notify(sdata, bss_change);
 202
 203         ieee80211_sta_def_wmm_params(sdata, sband->n_bitrates, supp_rates);
 204
 205         ifibss->state = IEEE80211_IBSS_MLME_JOINED;
 206         mod_timer(&ifibss->timer,
 207                   round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
 208
 209         bss = cfg80211_inform_bss_frame(local->hw.wiphy, local->hw.conf.channel,
 210                                         mgmt, skb->len, 0, GFP_KERNEL);
 211         cfg80211_put_bss(bss);
 212         netif_carrier_on(sdata->dev);
 213         cfg80211_ibss_joined(sdata->dev, ifibss->bssid, GFP_KERNEL);
 214 }
 215
 216 static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
 217                                     struct ieee80211_bss *bss)
 218 {
 219         struct cfg80211_bss *cbss =
 220                 container_of((void *)bss, struct cfg80211_bss, priv);
 221         struct ieee80211_supported_band *sband;
 222         u32 basic_rates;
 223         int i, j;
 224         u16 beacon_int = cbss->beacon_interval;
 225
 226         lockdep_assert_held(&sdata->u.ibss.mtx);
 227
 228         if (beacon_int < 10)
 229                 beacon_int = 10;
 230
 231         sband = sdata->local->hw.wiphy->bands[cbss->channel->band];
 232
 233         basic_rates = 0;
 234
 235         for (i = 0; i < bss->supp_rates_len; i++) {
 236                 int rate = (bss->supp_rates[i] & 0x7f) * 5;
 237                 bool is_basic = !!(bss->supp_rates[i] & 0x80);
 238
 239                 for (j = 0; j < sband->n_bitrates; j++) {
 240                         if (sband->bitrates[j].bitrate == rate) {
 241                                 if (is_basic)
 242                                         basic_rates |= BIT(j);
 243                                 break;
 244                         }
 245                 }
 246         }
 247
 248         __ieee80211_sta_join_ibss(sdata, cbss->bssid,
 249                                   beacon_int,
 250                                   cbss->channel,
 251                                   basic_rates,
 252                                   cbss->capability,
 253                                   cbss->tsf);
 254 }
 255
 256 static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta,
 257                                                   bool auth)
 258         __acquires(RCU)
 259 {
 260         struct ieee80211_sub_if_data *sdata = sta->sdata;
 261         u8 addr[ETH_ALEN];
 262
 263         memcpy(addr, sta->sta.addr, ETH_ALEN);
 264
 265 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 266         wiphy_debug(sdata->local->hw.wiphy,
 267                     "Adding new IBSS station %pM (dev=%s)\n",
 268                     addr, sdata->name);
 269 #endif
 270
 271         sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
 272         sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
 273         /* authorize the station only if the network is not RSN protected. If
 274          * not wait for the userspace to authorize it */
 275         if (!sta->sdata->u.ibss.control_port)
 276                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
 277
 278         rate_control_rate_init(sta);
 279
 280         /* If it fails, maybe we raced another insertion? */
 281         if (sta_info_insert_rcu(sta))
 282                 return sta_info_get(sdata, addr);
 283         if (auth) {
 284 #ifdef CONFIG_MAC80211_IBSS_DEBUG
 285                 printk(KERN_DEBUG "TX Auth SA=%pM DA=%pM BSSID=%pM"
 286                        "(auth_transaction=1)\n", sdata->vif.addr,
 287                        sdata->u.ibss.bssid, addr);
 288 #endif
 289                 ieee80211_send_auth(sdata, 1, WLAN_AUTH_OPEN, NULL, 0,
 290                                     addr, sdata->u.ibss.bssid, NULL, 0, 0);
 291         }
 292         return sta;
 293 }
 294
 295 static struct sta_info *
 296 ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata,
 297                        const u8 *bssid, const u8 *addr,
 298                        u32 supp_rates, bool auth)
 299         __acquires(RCU)
 300 {
 301         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 302         struct ieee80211_local *local = sdata->local;
 303         struct sta_info *sta;
 304         int band = local->hw.conf.channel->band;
 305
 306         /*
 307          * XXX: Consider removing the least recently used entry and
 308          *      allow new one to be added.
 309          */
 310         if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
 311                 net_dbg_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
 312                                     sdata->name, addr);
 313                 rcu_read_lock();
 314                 return NULL;
 315         }
 316
 317         if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) {
 318                 rcu_read_lock();
 319                 return NULL;
 320         }
 321
 322         if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) {
 323                 rcu_read_lock();
 324                 return NULL;
 325         }
 326
 327         sta = sta_info_alloc(sdata, addr, GFP_KERNEL);
 328         if (!sta) {
 329                 rcu_read_lock();
 330                 return NULL;
 331         }
 332
 333         sta->last_rx = jiffies;
 334
 335         /* make sure mandatory rates are always added */
 336         sta->sta.supp_rates[band] = supp_rates |
 337                         ieee80211_mandatory_rates(local, band);
 338
 339         return ieee80211_ibss_finish_sta(sta, auth);
 340 }
 341
 342 static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata,
 343                                         struct ieee80211_mgmt *mgmt,
 344                                         size_t len)
 345 {
 346         u16 auth_alg, auth_transaction;
 347
 348         lockdep_assert_held(&sdata->u.ibss.mtx);
 349
 350         if (len < 24 + 6)
 351                 return;
 352
 353         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
 354         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
 355
 356         if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
 357                 return;
 358 #ifdef CONFIG_MAC80211_IBSS_DEBUG
 359         printk(KERN_DEBUG "%s: RX Auth SA=%pM DA=%pM BSSID=%pM."
 360                "(auth_transaction=%d)\n",
 361                sdata->name, mgmt->sa, mgmt->da, mgmt->bssid, auth_transaction);
 362 #endif
 363         sta_info_destroy_addr(sdata, mgmt->sa);
 364         ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, 0, false);
 365         rcu_read_unlock();
 366
 367         /*
 368          * IEEE 802.11 standard does not require authentication in IBSS
 369          * networks and most implementations do not seem to use it.
 370          * However, try to reply to authentication attempts if someone
 371          * has actually implemented this.
 372          */
 373         ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, NULL, 0,
 374                             mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0);
 375 }
 376
 377 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
 378                                   struct ieee80211_mgmt *mgmt,
 379                                   size_t len,
 380                                   struct ieee80211_rx_status *rx_status,
 381                                   struct ieee802_11_elems *elems,
 382                                   bool beacon)
 383 {
 384         struct ieee80211_local *local = sdata->local;
 385         int freq;
 386         struct cfg80211_bss *cbss;
 387         struct ieee80211_bss *bss;
 388         struct sta_info *sta;
 389         struct ieee80211_channel *channel;
 390         u64 beacon_timestamp, rx_timestamp;
 391         u32 supp_rates = 0;
 392         enum ieee80211_band band = rx_status->band;
 393         struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band];
 394         bool rates_updated = false;
 395
 396         if (elems->ds_params && elems->ds_params_len == 1)
 397                 freq = ieee80211_channel_to_frequency(elems->ds_params[0],
 398                                                       band);
 399         else
 400                 freq = rx_status->freq;
 401
 402         channel = ieee80211_get_channel(local->hw.wiphy, freq);
 403
 404         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
 405                 return;
 406
 407         if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
 408             ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid)) {
 409
 410                 rcu_read_lock();
 411                 sta = sta_info_get(sdata, mgmt->sa);
 412
 413                 if (elems->supp_rates) {
 414                         supp_rates = ieee80211_sta_get_rates(local, elems,
 415                                                              band, NULL);
 416                         if (sta) {
 417                                 u32 prev_rates;
 418
 419                                 prev_rates = sta->sta.supp_rates[band];
 420                                 /* make sure mandatory rates are always added */
 421                                 sta->sta.supp_rates[band] = supp_rates |
 422                                         ieee80211_mandatory_rates(local, band);
 423
 424                                 if (sta->sta.supp_rates[band] != prev_rates) {
 425 #ifdef CONFIG_MAC80211_IBSS_DEBUG
 426                                         printk(KERN_DEBUG
 427                                                 "%s: updated supp_rates set "
 428                                                 "for %pM based on beacon"
 429                                                 "/probe_resp (0x%x -> 0x%x)\n",
 430                                                 sdata->name, sta->sta.addr,
 431                                                 prev_rates,
 432                                                 sta->sta.supp_rates[band]);
 433 #endif
 434                                         rates_updated = true;
 435                                 }
 436                         } else {
 437                                 rcu_read_unlock();
 438                                 sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid,
 439                                                 mgmt->sa, supp_rates, true);
 440                         }
 441                 }
 442
 443                 if (sta && elems->wmm_info)
 444                         set_sta_flag(sta, WLAN_STA_WME);
 445
 446                 if (sta && elems->ht_operation && elems->ht_cap_elem &&
 447                     sdata->u.ibss.channel_type != NL80211_CHAN_NO_HT) {
 448                         /* we both use HT */
 449                         struct ieee80211_sta_ht_cap sta_ht_cap_new;
 450                         enum nl80211_channel_type channel_type =
 451                                 ieee80211_ht_oper_to_channel_type(
 452                                                         elems->ht_operation);
 453
 454                         ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
 455                                                           elems->ht_cap_elem,
 456                                                           &sta_ht_cap_new);
 457
 458                         /*
 459                          * fall back to HT20 if we don't use or use
 460                          * the other extension channel
 461                          */
 462                         if (!(channel_type == NL80211_CHAN_HT40MINUS ||
 463                               channel_type == NL80211_CHAN_HT40PLUS) ||
 464                             channel_type != sdata->u.ibss.channel_type)
 465                                 sta_ht_cap_new.cap &=
 466                                         ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 467
 468                         if (memcmp(&sta->sta.ht_cap, &sta_ht_cap_new,
 469                                    sizeof(sta_ht_cap_new))) {
 470                                 memcpy(&sta->sta.ht_cap, &sta_ht_cap_new,
 471                                        sizeof(sta_ht_cap_new));
 472                                 rates_updated = true;
 473                         }
 474                 }
 475
 476                 if (sta && rates_updated)
 477                         rate_control_rate_init(sta);
 478
 479                 rcu_read_unlock();
 480         }
 481
 482         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
 483                                         channel, beacon);
 484         if (!bss)
 485                 return;
 486
 487         cbss = container_of((void *)bss, struct cfg80211_bss, priv);
 488
 489         /* was just updated in ieee80211_bss_info_update */
 490         beacon_timestamp = cbss->tsf;
 491
 492         /* check if we need to merge IBSS */
 493
 494         /* we use a fixed BSSID */
 495         if (sdata->u.ibss.fixed_bssid)
 496                 goto put_bss;
 497
 498         /* not an IBSS */
 499         if (!(cbss->capability & WLAN_CAPABILITY_IBSS))
 500                 goto put_bss;
 501
 502         /* different channel */
 503         if (cbss->channel != local->oper_channel)
 504                 goto put_bss;
 505
 506         /* different SSID */
 507         if (elems->ssid_len != sdata->u.ibss.ssid_len ||
 508             memcmp(elems->ssid, sdata->u.ibss.ssid,
 509                                 sdata->u.ibss.ssid_len))
 510                 goto put_bss;
 511
 512         /* same BSSID */
 513         if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid))
 514                 goto put_bss;
 515
 516         if (rx_status->flag & RX_FLAG_MACTIME_MPDU) {
 517                 /*
 518                  * For correct IBSS merging we need mactime; since mactime is
 519                  * defined as the time the first data symbol of the frame hits
 520                  * the PHY, and the timestamp of the beacon is defined as "the
 521                  * time that the data symbol containing the first bit of the
 522                  * timestamp is transmitted to the PHY plus the transmitting
 523                  * STA's delays through its local PHY from the MAC-PHY
 524                  * interface to its interface with the WM" (802.11 11.1.2)
 525                  * - equals the time this bit arrives at the receiver - we have
 526                  * to take into account the offset between the two.
 527                  *
 528                  * E.g. at 1 MBit that means mactime is 192 usec earlier
 529                  * (=24 bytes * 8 usecs/byte) than the beacon timestamp.
 530                  */
 531                 int rate;
 532
 533                 if (rx_status->flag & RX_FLAG_HT)
 534                         rate = 65; /* TODO: HT rates */
 535                 else
 536                         rate = local->hw.wiphy->bands[band]->
 537                                 bitrates[rx_status->rate_idx].bitrate;
 538
 539                 rx_timestamp = rx_status->mactime + (24 * 8 * 10 / rate);
 540         } else {
 541                 /*
 542                  * second best option: get current TSF
 543                  * (will return -1 if not supported)
 544                  */
 545                 rx_timestamp = drv_get_tsf(local, sdata);
 546         }
 547
 548 #ifdef CONFIG_MAC80211_IBSS_DEBUG
 549         printk(KERN_DEBUG "RX beacon SA=%pM BSSID="
 550                "%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
 551                mgmt->sa, mgmt->bssid,
 552                (unsigned long long)rx_timestamp,
 553                (unsigned long long)beacon_timestamp,
 554                (unsigned long long)(rx_timestamp - beacon_timestamp),
 555                jiffies);
 556 #endif
 557
 558         if (beacon_timestamp > rx_timestamp) {
 559 #ifdef CONFIG_MAC80211_IBSS_DEBUG
 560                 printk(KERN_DEBUG "%s: beacon TSF higher than "
 561                        "local TSF - IBSS merge with BSSID %pM\n",
 562                        sdata->name, mgmt->bssid);
 563 #endif
 564                 ieee80211_sta_join_ibss(sdata, bss);
 565                 supp_rates = ieee80211_sta_get_rates(local, elems, band, NULL);
 566                 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa,
 567                                        supp_rates, true);
 568                 rcu_read_unlock();
 569         }
 570
 571  put_bss:
 572         ieee80211_rx_bss_put(local, bss);
 573 }
 574
 575 void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata,
 576                               const u8 *bssid, const u8 *addr,
 577                               u32 supp_rates)
 578 {
 579         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 580         struct ieee80211_local *local = sdata->local;
 581         struct sta_info *sta;
 582         int band = local->hw.conf.channel->band;
 583
 584         /*
 585          * XXX: Consider removing the least recently used entry and
 586          *      allow new one to be added.
 587          */
 588         if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
 589                 net_dbg_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
 590                                     sdata->name, addr);
 591                 return;
 592         }
 593
 594         if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH)
 595                 return;
 596
 597         if (!ether_addr_equal(bssid, sdata->u.ibss.bssid))
 598                 return;
 599
 600         sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
 601         if (!sta)
 602                 return;
 603
 604         sta->last_rx = jiffies;
 605
 606         /* make sure mandatory rates are always added */
 607         sta->sta.supp_rates[band] = supp_rates |
 608                         ieee80211_mandatory_rates(local, band);
 609
 610         spin_lock(&ifibss->incomplete_lock);
 611         list_add(&sta->list, &ifibss->incomplete_stations);
 612         spin_unlock(&ifibss->incomplete_lock);
 613         ieee80211_queue_work(&local->hw, &sdata->work);
 614 }
 615
 616 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
 617 {
 618         struct ieee80211_local *local = sdata->local;
 619         int active = 0;
 620         struct sta_info *sta;
 621
 622         lockdep_assert_held(&sdata->u.ibss.mtx);
 623
 624         rcu_read_lock();
 625
 626         list_for_each_entry_rcu(sta, &local->sta_list, list) {
 627                 if (sta->sdata == sdata &&
 628                     time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
 629                                jiffies)) {
 630                         active++;
 631                         break;
 632                 }
 633         }
 634
 635         rcu_read_unlock();
 636
 637         return active;
 638 }
 639
 640 /*
 641  * This function is called with state == IEEE80211_IBSS_MLME_JOINED
 642  */
 643
 644 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
 645 {
 646         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 647
 648         lockdep_assert_held(&ifibss->mtx);
 649
 650         mod_timer(&ifibss->timer,
 651                   round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
 652
 653         ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT);
 654
 655         if (time_before(jiffies, ifibss->last_scan_completed +
 656                        IEEE80211_IBSS_MERGE_INTERVAL))
 657                 return;
 658
 659         if (ieee80211_sta_active_ibss(sdata))
 660                 return;
 661
 662         if (ifibss->fixed_channel)
 663                 return;
 664
 665         printk(KERN_DEBUG "%s: No active IBSS STAs - trying to scan for other "
 666                "IBSS networks with same SSID (merge)\n", sdata->name);
 667
 668         ieee80211_request_internal_scan(sdata,
 669                         ifibss->ssid, ifibss->ssid_len, NULL);
 670 }
 671
 672 static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
 673 {
 674         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 675         u8 bssid[ETH_ALEN];
 676         u16 capability;
 677         int i;
 678
 679         lockdep_assert_held(&ifibss->mtx);
 680
 681         if (ifibss->fixed_bssid) {
 682                 memcpy(bssid, ifibss->bssid, ETH_ALEN);
 683         } else {
 684                 /* Generate random, not broadcast, locally administered BSSID. Mix in
 685                  * own MAC address to make sure that devices that do not have proper
 686                  * random number generator get different BSSID. */
 687                 get_random_bytes(bssid, ETH_ALEN);
 688                 for (i = 0; i < ETH_ALEN; i++)
 689                         bssid[i] ^= sdata->vif.addr[i];
 690                 bssid[0] &= ~0x01;
 691                 bssid[0] |= 0x02;
 692         }
 693
 694         printk(KERN_DEBUG "%s: Creating new IBSS network, BSSID %pM\n",
 695                sdata->name, bssid);
 696
 697         capability = WLAN_CAPABILITY_IBSS;
 698
 699         if (ifibss->privacy)
 700                 capability |= WLAN_CAPABILITY_PRIVACY;
 701         else
 702                 sdata->drop_unencrypted = 0;
 703
 704         __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int,
 705                                   ifibss->channel, ifibss->basic_rates,
 706                                   capability, 0);
 707 }
 708
 709 /*
 710  * This function is called with state == IEEE80211_IBSS_MLME_SEARCH
 711  */
 712
 713 static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
 714 {
 715         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 716         struct ieee80211_local *local = sdata->local;
 717         struct cfg80211_bss *cbss;
 718         struct ieee80211_channel *chan = NULL;
 719         const u8 *bssid = NULL;
 720         int active_ibss;
 721         u16 capability;
 722
 723         lockdep_assert_held(&ifibss->mtx);
 724
 725         active_ibss = ieee80211_sta_active_ibss(sdata);
 726 #ifdef CONFIG_MAC80211_IBSS_DEBUG
 727         printk(KERN_DEBUG "%s: sta_find_ibss (active_ibss=%d)\n",
 728                sdata->name, active_ibss);
 729 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
 730
 731         if (active_ibss)
 732                 return;
 733
 734         capability = WLAN_CAPABILITY_IBSS;
 735         if (ifibss->privacy)
 736                 capability |= WLAN_CAPABILITY_PRIVACY;
 737         if (ifibss->fixed_bssid)
 738                 bssid = ifibss->bssid;
 739         if (ifibss->fixed_channel)
 740                 chan = ifibss->channel;
 741         if (!is_zero_ether_addr(ifibss->bssid))
 742                 bssid = ifibss->bssid;
 743         cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid,
 744                                 ifibss->ssid, ifibss->ssid_len,
 745                                 WLAN_CAPABILITY_IBSS | WLAN_CAPABILITY_PRIVACY,
 746                                 capability);
 747
 748         if (cbss) {
 749                 struct ieee80211_bss *bss;
 750
 751                 bss = (void *)cbss->priv;
 752 #ifdef CONFIG_MAC80211_IBSS_DEBUG
 753                 printk(KERN_DEBUG "   sta_find_ibss: selected %pM current "
 754                        "%pM\n", cbss->bssid, ifibss->bssid);
 755 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
 756
 757                 printk(KERN_DEBUG "%s: Selected IBSS BSSID %pM"
 758                        " based on configured SSID\n",
 759                        sdata->name, cbss->bssid);
 760
 761                 ieee80211_sta_join_ibss(sdata, bss);
 762                 ieee80211_rx_bss_put(local, bss);
 763                 return;
 764         }
 765
 766 #ifdef CONFIG_MAC80211_IBSS_DEBUG
 767         printk(KERN_DEBUG "   did not try to join ibss\n");
 768 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
 769
 770         /* Selected IBSS not found in current scan results - try to scan */
 771         if (time_after(jiffies, ifibss->last_scan_completed +
 772                                         IEEE80211_SCAN_INTERVAL)) {
 773                 printk(KERN_DEBUG "%s: Trigger new scan to find an IBSS to "
 774                        "join\n", sdata->name);
 775
 776                 ieee80211_request_internal_scan(sdata,
 777                                 ifibss->ssid, ifibss->ssid_len,
 778                                 ifibss->fixed_channel ? ifibss->channel : NULL);
 779         } else {
 780                 int interval = IEEE80211_SCAN_INTERVAL;
 781
 782                 if (time_after(jiffies, ifibss->ibss_join_req +
 783                                IEEE80211_IBSS_JOIN_TIMEOUT)) {
 784                         if (!(local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS)) {
 785                                 ieee80211_sta_create_ibss(sdata);
 786                                 return;
 787                         }
 788                         printk(KERN_DEBUG "%s: IBSS not allowed on"
 789                                " %d MHz\n", sdata->name,
 790                                local->hw.conf.channel->center_freq);
 791
 792                         /* No IBSS found - decrease scan interval and continue
 793                          * scanning. */
 794                         interval = IEEE80211_SCAN_INTERVAL_SLOW;
 795                 }
 796
 797                 mod_timer(&ifibss->timer,
 798                           round_jiffies(jiffies + interval));
 799         }
 800 }
 801
 802 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
 803                                         struct sk_buff *req)
 804 {
 805         struct ieee80211_mgmt *mgmt = (void *)req->data;
 806         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 807         struct ieee80211_local *local = sdata->local;
 808         int tx_last_beacon, len = req->len;
 809         struct sk_buff *skb;
 810         struct ieee80211_mgmt *resp;
 811         struct sk_buff *presp;
 812         u8 *pos, *end;
 813
 814         lockdep_assert_held(&ifibss->mtx);
 815
 816         presp = rcu_dereference_protected(ifibss->presp,
 817                                           lockdep_is_held(&ifibss->mtx));
 818
 819         if (ifibss->state != IEEE80211_IBSS_MLME_JOINED ||
 820             len < 24 + 2 || !presp)
 821                 return;
 822
 823         tx_last_beacon = drv_tx_last_beacon(local);
 824
 825 #ifdef CONFIG_MAC80211_IBSS_DEBUG
 826         printk(KERN_DEBUG "%s: RX ProbeReq SA=%pM DA=%pM BSSID=%pM"
 827                " (tx_last_beacon=%d)\n",
 828                sdata->name, mgmt->sa, mgmt->da,
 829                mgmt->bssid, tx_last_beacon);
 830 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
 831
 832         if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da))
 833                 return;
 834
 835         if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) &&
 836             !is_broadcast_ether_addr(mgmt->bssid))
 837                 return;
 838
 839         end = ((u8 *) mgmt) + len;
 840         pos = mgmt->u.probe_req.variable;
 841         if (pos[0] != WLAN_EID_SSID ||
 842             pos + 2 + pos[1] > end) {
 843 #ifdef CONFIG_MAC80211_IBSS_DEBUG
 844                 printk(KERN_DEBUG "%s: Invalid SSID IE in ProbeReq "
 845                        "from %pM\n",
 846                        sdata->name, mgmt->sa);
 847 #endif
 848                 return;
 849         }
 850         if (pos[1] != 0 &&
 851             (pos[1] != ifibss->ssid_len ||
 852              memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) {
 853                 /* Ignore ProbeReq for foreign SSID */
 854                 return;
 855         }
 856
 857         /* Reply with ProbeResp */
 858         skb = skb_copy(presp, GFP_KERNEL);
 859         if (!skb)
 860                 return;
 861
 862         resp = (struct ieee80211_mgmt *) skb->data;
 863         memcpy(resp->da, mgmt->sa, ETH_ALEN);
 864 #ifdef CONFIG_MAC80211_IBSS_DEBUG
 865         printk(KERN_DEBUG "%s: Sending ProbeResp to %pM\n",
 866                sdata->name, resp->da);
 867 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
 868         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 869         ieee80211_tx_skb(sdata, skb);
 870 }
 871
 872 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
 873                                          struct ieee80211_mgmt *mgmt,
 874                                          size_t len,
 875                                          struct ieee80211_rx_status *rx_status)
 876 {
 877         size_t baselen;
 878         struct ieee802_11_elems elems;
 879
 880         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
 881         if (baselen > len)
 882                 return;
 883
 884         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
 885                                 &elems);
 886
 887         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
 888 }
 889
 890 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
 891                                      struct ieee80211_mgmt *mgmt,
 892                                      size_t len,
 893                                      struct ieee80211_rx_status *rx_status)
 894 {
 895         size_t baselen;
 896         struct ieee802_11_elems elems;
 897
 898         /* Process beacon from the current BSS */
 899         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
 900         if (baselen > len)
 901                 return;
 902
 903         ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems);
 904
 905         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true);
 906 }
 907
 908 void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
 909                                    struct sk_buff *skb)
 910 {
 911         struct ieee80211_rx_status *rx_status;
 912         struct ieee80211_mgmt *mgmt;
 913         u16 fc;
 914
 915         rx_status = IEEE80211_SKB_RXCB(skb);
 916         mgmt = (struct ieee80211_mgmt *) skb->data;
 917         fc = le16_to_cpu(mgmt->frame_control);
 918
 919         mutex_lock(&sdata->u.ibss.mtx);
 920
 921         if (!sdata->u.ibss.ssid_len)
 922                 goto mgmt_out; /* not ready to merge yet */
 923
 924         switch (fc & IEEE80211_FCTL_STYPE) {
 925         case IEEE80211_STYPE_PROBE_REQ:
 926                 ieee80211_rx_mgmt_probe_req(sdata, skb);
 927                 break;
 928         case IEEE80211_STYPE_PROBE_RESP:
 929                 ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len,
 930                                              rx_status);
 931                 break;
 932         case IEEE80211_STYPE_BEACON:
 933                 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
 934                                          rx_status);
 935                 break;
 936         case IEEE80211_STYPE_AUTH:
 937                 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len);
 938                 break;
 939         }
 940
 941  mgmt_out:
 942         mutex_unlock(&sdata->u.ibss.mtx);
 943 }
 944
 945 void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata)
 946 {
 947         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 948         struct sta_info *sta;
 949
 950         mutex_lock(&ifibss->mtx);
 951
 952         /*
 953          * Work could be scheduled after scan or similar
 954          * when we aren't even joined (or trying) with a
 955          * network.
 956          */
 957         if (!ifibss->ssid_len)
 958                 goto out;
 959
 960         spin_lock_bh(&ifibss->incomplete_lock);
 961         while (!list_empty(&ifibss->incomplete_stations)) {
 962                 sta = list_first_entry(&ifibss->incomplete_stations,
 963                                        struct sta_info, list);
 964                 list_del(&sta->list);
 965                 spin_unlock_bh(&ifibss->incomplete_lock);
 966
 967                 ieee80211_ibss_finish_sta(sta, true);
 968                 rcu_read_unlock();
 969                 spin_lock_bh(&ifibss->incomplete_lock);
 970         }
 971         spin_unlock_bh(&ifibss->incomplete_lock);
 972
 973         switch (ifibss->state) {
 974         case IEEE80211_IBSS_MLME_SEARCH:
 975                 ieee80211_sta_find_ibss(sdata);
 976                 break;
 977         case IEEE80211_IBSS_MLME_JOINED:
 978                 ieee80211_sta_merge_ibss(sdata);
 979                 break;
 980         default:
 981                 WARN_ON(1);
 982                 break;
 983         }
 984
 985  out:
 986         mutex_unlock(&ifibss->mtx);
 987 }
 988
 989 static void ieee80211_ibss_timer(unsigned long data)
 990 {
 991         struct ieee80211_sub_if_data *sdata =
 992                 (struct ieee80211_sub_if_data *) data;
 993         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 994         struct ieee80211_local *local = sdata->local;
 995
 996         if (local->quiescing) {
 997                 ifibss->timer_running = true;
 998                 return;
 999         }
1000
1001         ieee80211_queue_work(&local->hw, &sdata->work);
1002 }
1003
1004 #ifdef CONFIG_PM
1005 void ieee80211_ibss_quiesce(struct ieee80211_sub_if_data *sdata)
1006 {
1007         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1008
1009         if (del_timer_sync(&ifibss->timer))
1010                 ifibss->timer_running = true;
1011 }
1012
1013 void ieee80211_ibss_restart(struct ieee80211_sub_if_data *sdata)
1014 {
1015         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1016
1017         if (ifibss->timer_running) {
1018                 add_timer(&ifibss->timer);
1019                 ifibss->timer_running = false;
1020         }
1021 }
1022 #endif
1023
1024 void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata)
1025 {
1026         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1027
1028         setup_timer(&ifibss->timer, ieee80211_ibss_timer,
1029                     (unsigned long) sdata);
1030         mutex_init(&ifibss->mtx);
1031         INIT_LIST_HEAD(&ifibss->incomplete_stations);
1032         spin_lock_init(&ifibss->incomplete_lock);
1033 }
1034
1035 /* scan finished notification */
1036 void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local)
1037 {
1038         struct ieee80211_sub_if_data *sdata;
1039
1040         mutex_lock(&local->iflist_mtx);
1041         list_for_each_entry(sdata, &local->interfaces, list) {
1042                 if (!ieee80211_sdata_running(sdata))
1043                         continue;
1044                 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
1045                         continue;
1046                 sdata->u.ibss.last_scan_completed = jiffies;
1047                 ieee80211_queue_work(&local->hw, &sdata->work);
1048         }
1049         mutex_unlock(&local->iflist_mtx);
1050 }
1051
1052 int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
1053                         struct cfg80211_ibss_params *params)
1054 {
1055         struct sk_buff *skb;
1056         u32 changed = 0;
1057
1058         skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom +
1059                             sizeof(struct ieee80211_hdr_3addr) +
1060                             12 /* struct ieee80211_mgmt.u.beacon */ +
1061                             2 + IEEE80211_MAX_SSID_LEN /* max SSID */ +
1062                             2 + 8 /* max Supported Rates */ +
1063                             3 /* max DS params */ +
1064                             4 /* IBSS params */ +
1065                             2 + (IEEE80211_MAX_SUPP_RATES - 8) +
1066                             2 + sizeof(struct ieee80211_ht_cap) +
1067                             2 + sizeof(struct ieee80211_ht_operation) +
1068                             params->ie_len);
1069         if (!skb)
1070                 return -ENOMEM;
1071
1072         mutex_lock(&sdata->u.ibss.mtx);
1073
1074         if (params->bssid) {
1075                 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN);
1076                 sdata->u.ibss.fixed_bssid = true;
1077         } else
1078                 sdata->u.ibss.fixed_bssid = false;
1079
1080         sdata->u.ibss.privacy = params->privacy;
1081         sdata->u.ibss.control_port = params->control_port;
1082         sdata->u.ibss.basic_rates = params->basic_rates;
1083         memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate,
1084                sizeof(params->mcast_rate));
1085
1086         sdata->vif.bss_conf.beacon_int = params->beacon_interval;
1087
1088         sdata->u.ibss.channel = params->channel;
1089         sdata->u.ibss.channel_type = params->channel_type;
1090         sdata->u.ibss.fixed_channel = params->channel_fixed;
1091
1092         /* fix ourselves to that channel now already */
1093         if (params->channel_fixed) {
1094                 sdata->local->oper_channel = params->channel;
1095                 if (!ieee80211_set_channel_type(sdata->local, sdata,
1096                                                params->channel_type)) {
1097                         mutex_unlock(&sdata->u.ibss.mtx);
1098                         kfree_skb(skb);
1099                         return -EINVAL;
1100                 }
1101         }
1102
1103         if (params->ie) {
1104                 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len,
1105                                            GFP_KERNEL);
1106                 if (sdata->u.ibss.ie)
1107                         sdata->u.ibss.ie_len = params->ie_len;
1108         }
1109
1110         sdata->u.ibss.skb = skb;
1111         sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
1112         sdata->u.ibss.ibss_join_req = jiffies;
1113
1114         memcpy(sdata->u.ibss.ssid, params->ssid, IEEE80211_MAX_SSID_LEN);
1115         sdata->u.ibss.ssid_len = params->ssid_len;
1116
1117         mutex_unlock(&sdata->u.ibss.mtx);
1118
1119         mutex_lock(&sdata->local->mtx);
1120         ieee80211_recalc_idle(sdata->local);
1121         mutex_unlock(&sdata->local->mtx);
1122
1123         /*
1124          * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is
1125          * reserved, but an HT STA shall protect HT transmissions as though
1126          * the HT Protection field were set to non-HT mixed mode.
1127          *
1128          * In an IBSS, the RIFS Mode field of the HT Operation element is
1129          * also reserved, but an HT STA shall operate as though this field
1130          * were set to 1.
1131          */
1132
1133         sdata->vif.bss_conf.ht_operation_mode |=
1134                   IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED
1135                 | IEEE80211_HT_PARAM_RIFS_MODE;
1136
1137         changed |= BSS_CHANGED_HT;
1138         ieee80211_bss_info_change_notify(sdata, changed);
1139
1140         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1141
1142         return 0;
1143 }
1144
1145 int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata)
1146 {
1147         struct sk_buff *skb;
1148         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1149         struct ieee80211_local *local = sdata->local;
1150         struct cfg80211_bss *cbss;
1151         u16 capability;
1152         int active_ibss;
1153         struct sta_info *sta;
1154
1155         mutex_lock(&sdata->u.ibss.mtx);
1156
1157         sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
1158         memset(sdata->u.ibss.bssid, 0, ETH_ALEN);
1159         sdata->u.ibss.ssid_len = 0;
1160
1161         active_ibss = ieee80211_sta_active_ibss(sdata);
1162
1163         if (!active_ibss && !is_zero_ether_addr(ifibss->bssid)) {
1164                 capability = WLAN_CAPABILITY_IBSS;
1165
1166                 if (ifibss->privacy)
1167                         capability |= WLAN_CAPABILITY_PRIVACY;
1168
1169                 cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->channel,
1170                                         ifibss->bssid, ifibss->ssid,
1171                                         ifibss->ssid_len, WLAN_CAPABILITY_IBSS |
1172                                         WLAN_CAPABILITY_PRIVACY,
1173                                         capability);
1174
1175                 if (cbss) {
1176                         cfg80211_unlink_bss(local->hw.wiphy, cbss);
1177                         cfg80211_put_bss(cbss);
1178                 }
1179         }
1180
1181         sta_info_flush(sdata->local, sdata);
1182
1183         spin_lock_bh(&ifibss->incomplete_lock);
1184         while (!list_empty(&ifibss->incomplete_stations)) {
1185                 sta = list_first_entry(&ifibss->incomplete_stations,
1186                                        struct sta_info, list);
1187                 list_del(&sta->list);
1188                 spin_unlock_bh(&ifibss->incomplete_lock);
1189
1190                 sta_info_free(local, sta);
1191                 spin_lock_bh(&ifibss->incomplete_lock);
1192         }
1193         spin_unlock_bh(&ifibss->incomplete_lock);
1194
1195         netif_carrier_off(sdata->dev);
1196
1197         /* remove beacon */
1198         kfree(sdata->u.ibss.ie);
1199         skb = rcu_dereference_protected(sdata->u.ibss.presp,
1200                                         lockdep_is_held(&sdata->u.ibss.mtx));
1201         RCU_INIT_POINTER(sdata->u.ibss.presp, NULL);
1202         sdata->vif.bss_conf.ibss_joined = false;
1203         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED |
1204                                                 BSS_CHANGED_IBSS);
1205         synchronize_rcu();
1206         kfree_skb(skb);
1207
1208         skb_queue_purge(&sdata->skb_queue);
1209
1210         del_timer_sync(&sdata->u.ibss.timer);
1211
1212         mutex_unlock(&sdata->u.ibss.mtx);
1213
1214         mutex_lock(&local->mtx);
1215         ieee80211_recalc_idle(sdata->local);
1216         mutex_unlock(&local->mtx);
1217
1218         return 0;
1219 }