net/mac80211/ibss.c

   1 /*
   2  * IBSS mode implementation
   3  * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
   4  * Copyright 2004, Instant802 Networks, Inc.
   5  * Copyright 2005, Devicescape Software, Inc.
   6  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   7  * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
   8  * Copyright 2009, Johannes Berg <johannes@sipsolutions.net>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2 as
  12  * published by the Free Software Foundation.
  13  */
  14
  15 #include <linux/delay.h>
  16 #include <linux/slab.h>
  17 #include <linux/if_ether.h>
  18 #include <linux/skbuff.h>
  19 #include <linux/if_arp.h>
  20 #include <linux/etherdevice.h>
  21 #include <linux/rtnetlink.h>
  22 #include <net/mac80211.h>
  23
  24 #include "ieee80211_i.h"
  25 #include "driver-ops.h"
  26 #include "rate.h"
  27
  28 #define IEEE80211_SCAN_INTERVAL (2 * HZ)
  29 #define IEEE80211_SCAN_INTERVAL_SLOW (15 * HZ)
  30 #define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ)
  31
  32 #define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ)
  33 #define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ)
  34
  35 #define IEEE80211_IBSS_MAX_STA_ENTRIES 128
  36
  37
  38 static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
  39                                       const u8 *bssid, const int beacon_int,
  40                                       struct ieee80211_channel *chan,
  41                                       const u32 basic_rates,
  42                                       const u16 capability, u64 tsf)
  43 {
  44         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
  45         struct ieee80211_local *local = sdata->local;
  46         int rates, i;
  47         struct sk_buff *skb;
  48         struct ieee80211_mgmt *mgmt;
  49         u8 *pos;
  50         struct ieee80211_supported_band *sband;
  51         struct cfg80211_bss *bss;
  52         u32 bss_change;
  53         u8 supp_rates[IEEE80211_MAX_SUPP_RATES];
  54         enum nl80211_channel_type channel_type;
  55
  56         lockdep_assert_held(&ifibss->mtx);
  57
  58         /* Reset own TSF to allow time synchronization work. */
  59         drv_reset_tsf(local, sdata);
  60
  61         skb = ifibss->skb;
  62         RCU_INIT_POINTER(ifibss->presp, NULL);
  63         synchronize_rcu();
  64         skb->data = skb->head;
  65         skb->len = 0;
  66         skb_reset_tail_pointer(skb);
  67         skb_reserve(skb, sdata->local->hw.extra_tx_headroom);
  68
  69         if (compare_ether_addr(ifibss->bssid, bssid))
  70                 sta_info_flush(sdata->local, sdata);
  71
  72         /* if merging, indicate to driver that we leave the old IBSS */
  73         if (sdata->vif.bss_conf.ibss_joined) {
  74                 sdata->vif.bss_conf.ibss_joined = false;
  75                 netif_carrier_off(sdata->dev);
  76                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_IBSS);
  77         }
  78
  79         memcpy(ifibss->bssid, bssid, ETH_ALEN);
  80
  81         sdata->drop_unencrypted = capability & WLAN_CAPABILITY_PRIVACY ? 1 : 0;
  82
  83         local->oper_channel = chan;
  84         channel_type = ifibss->channel_type;
  85         if (channel_type > NL80211_CHAN_HT20 &&
  86             !cfg80211_can_beacon_sec_chan(local->hw.wiphy, chan, channel_type))
  87                 channel_type = NL80211_CHAN_HT20;
  88         if (!ieee80211_set_channel_type(local, sdata, channel_type)) {
  89                 /* can only fail due to HT40+/- mismatch */
  90                 channel_type = NL80211_CHAN_HT20;
  91                 WARN_ON(!ieee80211_set_channel_type(local, sdata,
  92                                                     NL80211_CHAN_HT20));
  93         }
  94         ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
  95
  96         sband = local->hw.wiphy->bands[chan->band];
  97
  98         /* build supported rates array */
  99         pos = supp_rates;
 100         for (i = 0; i < sband->n_bitrates; i++) {
 101                 int rate = sband->bitrates[i].bitrate;
 102                 u8 basic = 0;
 103                 if (basic_rates & BIT(i))
 104                         basic = 0x80;
 105                 *pos++ = basic | (u8) (rate / 5);
 106         }
 107
 108         /* Build IBSS probe response */
 109         mgmt = (void *) skb_put(skb, 24 + sizeof(mgmt->u.beacon));
 110         memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
 111         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 112                                           IEEE80211_STYPE_PROBE_RESP);
 113         memset(mgmt->da, 0xff, ETH_ALEN);
 114         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 115         memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN);
 116         mgmt->u.beacon.beacon_int = cpu_to_le16(beacon_int);
 117         mgmt->u.beacon.timestamp = cpu_to_le64(tsf);
 118         mgmt->u.beacon.capab_info = cpu_to_le16(capability);
 119
 120         pos = skb_put(skb, 2 + ifibss->ssid_len);
 121         *pos++ = WLAN_EID_SSID;
 122         *pos++ = ifibss->ssid_len;
 123         memcpy(pos, ifibss->ssid, ifibss->ssid_len);
 124
 125         rates = sband->n_bitrates;
 126         if (rates > 8)
 127                 rates = 8;
 128         pos = skb_put(skb, 2 + rates);
 129         *pos++ = WLAN_EID_SUPP_RATES;
 130         *pos++ = rates;
 131         memcpy(pos, supp_rates, rates);
 132
 133         if (sband->band == IEEE80211_BAND_2GHZ) {
 134                 pos = skb_put(skb, 2 + 1);
 135                 *pos++ = WLAN_EID_DS_PARAMS;
 136                 *pos++ = 1;
 137                 *pos++ = ieee80211_frequency_to_channel(chan->center_freq);
 138         }
 139
 140         pos = skb_put(skb, 2 + 2);
 141         *pos++ = WLAN_EID_IBSS_PARAMS;
 142         *pos++ = 2;
 143         /* FIX: set ATIM window based on scan results */
 144         *pos++ = 0;
 145         *pos++ = 0;
 146
 147         if (sband->n_bitrates > 8) {
 148                 rates = sband->n_bitrates - 8;
 149                 pos = skb_put(skb, 2 + rates);
 150                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 151                 *pos++ = rates;
 152                 memcpy(pos, &supp_rates[8], rates);
 153         }
 154
 155         if (ifibss->ie_len)
 156                 memcpy(skb_put(skb, ifibss->ie_len),
 157                        ifibss->ie, ifibss->ie_len);
 158
 159         /* add HT capability and information IEs */
 160         if (channel_type && sband->ht_cap.ht_supported) {
 161                 pos = skb_put(skb, 4 +
 162                                    sizeof(struct ieee80211_ht_cap) +
 163                                    sizeof(struct ieee80211_ht_info));
 164                 pos = ieee80211_ie_build_ht_cap(pos, &sband->ht_cap,
 165                                                 sband->ht_cap.cap);
 166                 pos = ieee80211_ie_build_ht_info(pos,
 167                                                  &sband->ht_cap,
 168                                                  chan,
 169                                                  channel_type);
 170         }
 171
 172         if (local->hw.queues >= 4) {
 173                 pos = skb_put(skb, 9);
 174                 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
 175                 *pos++ = 7; /* len */
 176                 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
 177                 *pos++ = 0x50;
 178                 *pos++ = 0xf2;
 179                 *pos++ = 2; /* WME */
 180                 *pos++ = 0; /* WME info */
 181                 *pos++ = 1; /* WME ver */
 182                 *pos++ = 0; /* U-APSD no in use */
 183         }
 184
 185         rcu_assign_pointer(ifibss->presp, skb);
 186
 187         sdata->vif.bss_conf.beacon_int = beacon_int;
 188         sdata->vif.bss_conf.basic_rates = basic_rates;
 189         bss_change = BSS_CHANGED_BEACON_INT;
 190         bss_change |= ieee80211_reset_erp_info(sdata);
 191         bss_change |= BSS_CHANGED_BSSID;
 192         bss_change |= BSS_CHANGED_BEACON;
 193         bss_change |= BSS_CHANGED_BEACON_ENABLED;
 194         bss_change |= BSS_CHANGED_BASIC_RATES;
 195         bss_change |= BSS_CHANGED_HT;
 196         bss_change |= BSS_CHANGED_IBSS;
 197         sdata->vif.bss_conf.ibss_joined = true;
 198         ieee80211_bss_info_change_notify(sdata, bss_change);
 199
 200         ieee80211_sta_def_wmm_params(sdata, sband->n_bitrates, supp_rates);
 201
 202         ifibss->state = IEEE80211_IBSS_MLME_JOINED;
 203         mod_timer(&ifibss->timer,
 204                   round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
 205
 206         bss = cfg80211_inform_bss_frame(local->hw.wiphy, local->hw.conf.channel,
 207                                         mgmt, skb->len, 0, GFP_KERNEL);
 208         cfg80211_put_bss(bss);
 209         netif_carrier_on(sdata->dev);
 210         cfg80211_ibss_joined(sdata->dev, ifibss->bssid, GFP_KERNEL);
 211 }
 212
 213 static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
 214                                     struct ieee80211_bss *bss)
 215 {
 216         struct cfg80211_bss *cbss =
 217                 container_of((void *)bss, struct cfg80211_bss, priv);
 218         struct ieee80211_supported_band *sband;
 219         u32 basic_rates;
 220         int i, j;
 221         u16 beacon_int = cbss->beacon_interval;
 222
 223         lockdep_assert_held(&sdata->u.ibss.mtx);
 224
 225         if (beacon_int < 10)
 226                 beacon_int = 10;
 227
 228         sband = sdata->local->hw.wiphy->bands[cbss->channel->band];
 229
 230         basic_rates = 0;
 231
 232         for (i = 0; i < bss->supp_rates_len; i++) {
 233                 int rate = (bss->supp_rates[i] & 0x7f) * 5;
 234                 bool is_basic = !!(bss->supp_rates[i] & 0x80);
 235
 236                 for (j = 0; j < sband->n_bitrates; j++) {
 237                         if (sband->bitrates[j].bitrate == rate) {
 238                                 if (is_basic)
 239                                         basic_rates |= BIT(j);
 240                                 break;
 241                         }
 242                 }
 243         }
 244
 245         __ieee80211_sta_join_ibss(sdata, cbss->bssid,
 246                                   beacon_int,
 247                                   cbss->channel,
 248                                   basic_rates,
 249                                   cbss->capability,
 250                                   cbss->tsf);
 251 }
 252
 253 static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta,
 254                                                   bool auth)
 255         __acquires(RCU)
 256 {
 257         struct ieee80211_sub_if_data *sdata = sta->sdata;
 258         u8 addr[ETH_ALEN];
 259
 260         memcpy(addr, sta->sta.addr, ETH_ALEN);
 261
 262 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 263         wiphy_debug(sdata->local->hw.wiphy,
 264                     "Adding new IBSS station %pM (dev=%s)\n",
 265                     addr, sdata->name);
 266 #endif
 267
 268         sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
 269         sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
 270         /* authorize the station only if the network is not RSN protected. If
 271          * not wait for the userspace to authorize it */
 272         if (!sta->sdata->u.ibss.control_port)
 273                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
 274
 275         rate_control_rate_init(sta);
 276
 277         /* If it fails, maybe we raced another insertion? */
 278         if (sta_info_insert_rcu(sta))
 279                 return sta_info_get(sdata, addr);
 280         if (auth) {
 281 #ifdef CONFIG_MAC80211_IBSS_DEBUG
 282                 printk(KERN_DEBUG "TX Auth SA=%pM DA=%pM BSSID=%pM"
 283                        "(auth_transaction=1)\n", sdata->vif.addr,
 284                        sdata->u.ibss.bssid, addr);
 285 #endif
 286                 ieee80211_send_auth(sdata, 1, WLAN_AUTH_OPEN, 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         int band = local->hw.conf.channel->band;
 302
 303         /*
 304          * XXX: Consider removing the least recently used entry and
 305          *      allow new one to be added.
 306          */
 307         if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
 308                 if (net_ratelimit())
 309                         printk(KERN_DEBUG "%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 (compare_ether_addr(bssid, sdata->u.ibss.bssid)) {
 321                 rcu_read_lock();
 322                 return NULL;
 323         }
 324
 325         sta = sta_info_alloc(sdata, addr, GFP_KERNEL);
 326         if (!sta) {
 327                 rcu_read_lock();
 328                 return NULL;
 329         }
 330
 331         sta->last_rx = jiffies;
 332
 333         /* make sure mandatory rates are always added */
 334         sta->sta.supp_rates[band] = supp_rates |
 335                         ieee80211_mandatory_rates(local, band);
 336
 337         return ieee80211_ibss_finish_sta(sta, auth);
 338 }
 339
 340 static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata,
 341                                         struct ieee80211_mgmt *mgmt,
 342                                         size_t len)
 343 {
 344         u16 auth_alg, auth_transaction;
 345
 346         lockdep_assert_held(&sdata->u.ibss.mtx);
 347
 348         if (len < 24 + 6)
 349                 return;
 350
 351         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
 352         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
 353
 354         if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
 355                 return;
 356 #ifdef CONFIG_MAC80211_IBSS_DEBUG
 357         printk(KERN_DEBUG "%s: RX Auth SA=%pM DA=%pM BSSID=%pM."
 358                "(auth_transaction=%d)\n",
 359                sdata->name, mgmt->sa, mgmt->da, mgmt->bssid, auth_transaction);
 360 #endif
 361         sta_info_destroy_addr(sdata, mgmt->sa);
 362         ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, 0, false);
 363         rcu_read_unlock();
 364
 365         /*
 366          * IEEE 802.11 standard does not require authentication in IBSS
 367          * networks and most implementations do not seem to use it.
 368          * However, try to reply to authentication attempts if someone
 369          * has actually implemented this.
 370          */
 371         ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, NULL, 0,
 372                             mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0);
 373 }
 374
 375 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
 376                                   struct ieee80211_mgmt *mgmt,
 377                                   size_t len,
 378                                   struct ieee80211_rx_status *rx_status,
 379                                   struct ieee802_11_elems *elems,
 380                                   bool beacon)
 381 {
 382         struct ieee80211_local *local = sdata->local;
 383         int freq;
 384         struct cfg80211_bss *cbss;
 385         struct ieee80211_bss *bss;
 386         struct sta_info *sta;
 387         struct ieee80211_channel *channel;
 388         u64 beacon_timestamp, rx_timestamp;
 389         u32 supp_rates = 0;
 390         enum ieee80211_band band = rx_status->band;
 391         struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band];
 392         bool rates_updated = false;
 393
 394         if (elems->ds_params && elems->ds_params_len == 1)
 395                 freq = ieee80211_channel_to_frequency(elems->ds_params[0],
 396                                                       band);
 397         else
 398                 freq = rx_status->freq;
 399
 400         channel = ieee80211_get_channel(local->hw.wiphy, freq);
 401
 402         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
 403                 return;
 404
 405         if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
 406             compare_ether_addr(mgmt->bssid, sdata->u.ibss.bssid) == 0) {
 407
 408                 rcu_read_lock();
 409                 sta = sta_info_get(sdata, mgmt->sa);
 410
 411                 if (elems->supp_rates) {
 412                         supp_rates = ieee80211_sta_get_rates(local, elems,
 413                                                              band);
 414                         if (sta) {
 415                                 u32 prev_rates;
 416
 417                                 prev_rates = sta->sta.supp_rates[band];
 418                                 /* make sure mandatory rates are always added */
 419                                 sta->sta.supp_rates[band] = supp_rates |
 420                                         ieee80211_mandatory_rates(local, band);
 421
 422                                 if (sta->sta.supp_rates[band] != prev_rates) {
 423 #ifdef CONFIG_MAC80211_IBSS_DEBUG
 424                                         printk(KERN_DEBUG
 425                                                 "%s: updated supp_rates set "
 426                                                 "for %pM based on beacon"
 427                                                 "/probe_resp (0x%x -> 0x%x)\n",
 428                                                 sdata->name, sta->sta.addr,
 429                                                 prev_rates,
 430                                                 sta->sta.supp_rates[band]);
 431 #endif
 432                                         rates_updated = true;
 433                                 }
 434                         } else {
 435                                 rcu_read_unlock();
 436                                 sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid,
 437                                                 mgmt->sa, supp_rates, true);
 438                         }
 439                 }
 440
 441                 if (sta && elems->wmm_info)
 442                         set_sta_flag(sta, WLAN_STA_WME);
 443
 444                 if (sta && elems->ht_info_elem && elems->ht_cap_elem &&
 445                     sdata->u.ibss.channel_type != NL80211_CHAN_NO_HT) {
 446                         /* we both use HT */
 447                         struct ieee80211_sta_ht_cap sta_ht_cap_new;
 448                         enum nl80211_channel_type channel_type =
 449                                 ieee80211_ht_info_to_channel_type(
 450                                                         elems->ht_info_elem);
 451
 452                         ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
 453                                                           elems->ht_cap_elem,
 454                                                           &sta_ht_cap_new);
 455
 456                         /*
 457                          * fall back to HT20 if we don't use or use
 458                          * the other extension channel
 459                          */
 460                         if ((channel_type == NL80211_CHAN_HT40MINUS ||
 461                              channel_type == NL80211_CHAN_HT40PLUS) &&
 462                             channel_type != sdata->u.ibss.channel_type)
 463                                 sta_ht_cap_new.cap &=
 464                                         ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 465
 466                         if (memcmp(&sta->sta.ht_cap, &sta_ht_cap_new,
 467                                    sizeof(sta_ht_cap_new))) {
 468                                 memcpy(&sta->sta.ht_cap, &sta_ht_cap_new,
 469                                        sizeof(sta_ht_cap_new));
 470                                 rates_updated = true;
 471                         }
 472                 }
 473
 474                 if (sta && rates_updated)
 475                         rate_control_rate_init(sta);
 476
 477                 rcu_read_unlock();
 478         }
 479
 480         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
 481                                         channel, beacon);
 482         if (!bss)
 483                 return;
 484
 485         cbss = container_of((void *)bss, struct cfg80211_bss, priv);
 486
 487         /* was just updated in ieee80211_bss_info_update */
 488         beacon_timestamp = cbss->tsf;
 489
 490         /* check if we need to merge IBSS */
 491
 492         /* we use a fixed BSSID */
 493         if (sdata->u.ibss.fixed_bssid)
 494                 goto put_bss;
 495
 496         /* not an IBSS */
 497         if (!(cbss->capability & WLAN_CAPABILITY_IBSS))
 498                 goto put_bss;
 499
 500         /* different channel */
 501         if (cbss->channel != local->oper_channel)
 502                 goto put_bss;
 503
 504         /* different SSID */
 505         if (elems->ssid_len != sdata->u.ibss.ssid_len ||
 506             memcmp(elems->ssid, sdata->u.ibss.ssid,
 507                                 sdata->u.ibss.ssid_len))
 508                 goto put_bss;
 509
 510         /* same BSSID */
 511         if (compare_ether_addr(cbss->bssid, sdata->u.ibss.bssid) == 0)
 512                 goto put_bss;
 513
 514         if (rx_status->flag & RX_FLAG_MACTIME_MPDU) {
 515                 /*
 516                  * For correct IBSS merging we need mactime; since mactime is
 517                  * defined as the time the first data symbol of the frame hits
 518                  * the PHY, and the timestamp of the beacon is defined as "the
 519                  * time that the data symbol containing the first bit of the
 520                  * timestamp is transmitted to the PHY plus the transmitting
 521                  * STA's delays through its local PHY from the MAC-PHY
 522                  * interface to its interface with the WM" (802.11 11.1.2)
 523                  * - equals the time this bit arrives at the receiver - we have
 524                  * to take into account the offset between the two.
 525                  *
 526                  * E.g. at 1 MBit that means mactime is 192 usec earlier
 527                  * (=24 bytes * 8 usecs/byte) than the beacon timestamp.
 528                  */
 529                 int rate;
 530
 531                 if (rx_status->flag & RX_FLAG_HT)
 532                         rate = 65; /* TODO: HT rates */
 533                 else
 534                         rate = local->hw.wiphy->bands[band]->
 535                                 bitrates[rx_status->rate_idx].bitrate;
 536
 537                 rx_timestamp = rx_status->mactime + (24 * 8 * 10 / rate);
 538         } else {
 539                 /*
 540                  * second best option: get current TSF
 541                  * (will return -1 if not supported)
 542                  */
 543                 rx_timestamp = drv_get_tsf(local, sdata);
 544         }
 545
 546 #ifdef CONFIG_MAC80211_IBSS_DEBUG
 547         printk(KERN_DEBUG "RX beacon SA=%pM BSSID="
 548                "%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
 549                mgmt->sa, mgmt->bssid,
 550                (unsigned long long)rx_timestamp,
 551                (unsigned long long)beacon_timestamp,
 552                (unsigned long long)(rx_timestamp - beacon_timestamp),
 553                jiffies);
 554 #endif
 555
 556         if (beacon_timestamp > rx_timestamp) {
 557 #ifdef CONFIG_MAC80211_IBSS_DEBUG
 558                 printk(KERN_DEBUG "%s: beacon TSF higher than "
 559                        "local TSF - IBSS merge with BSSID %pM\n",
 560                        sdata->name, mgmt->bssid);
 561 #endif
 562                 ieee80211_sta_join_ibss(sdata, bss);
 563                 supp_rates = ieee80211_sta_get_rates(local, elems, band);
 564                 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa,
 565                                        supp_rates, true);
 566                 rcu_read_unlock();
 567         }
 568
 569  put_bss:
 570         ieee80211_rx_bss_put(local, bss);
 571 }
 572
 573 void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata,
 574                               const u8 *bssid, const u8 *addr,
 575                               u32 supp_rates)
 576 {
 577         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 578         struct ieee80211_local *local = sdata->local;
 579         struct sta_info *sta;
 580         int band = local->hw.conf.channel->band;
 581
 582         /*
 583          * XXX: Consider removing the least recently used entry and
 584          *      allow new one to be added.
 585          */
 586         if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
 587                 if (net_ratelimit())
 588                         printk(KERN_DEBUG "%s: No room for a new IBSS STA entry %pM\n",
 589                                sdata->name, addr);
 590                 return;
 591         }
 592
 593         if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH)
 594                 return;
 595
 596         if (compare_ether_addr(bssid, sdata->u.ibss.bssid))
 597                 return;
 598
 599         sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
 600         if (!sta)
 601                 return;
 602
 603         sta->last_rx = jiffies;
 604
 605         /* make sure mandatory rates are always added */
 606         sta->sta.supp_rates[band] = supp_rates |
 607                         ieee80211_mandatory_rates(local, band);
 608
 609         spin_lock(&ifibss->incomplete_lock);
 610         list_add(&sta->list, &ifibss->incomplete_stations);
 611         spin_unlock(&ifibss->incomplete_lock);
 612         ieee80211_queue_work(&local->hw, &sdata->work);
 613 }
 614
 615 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
 616 {
 617         struct ieee80211_local *local = sdata->local;
 618         int active = 0;
 619         struct sta_info *sta;
 620
 621         lockdep_assert_held(&sdata->u.ibss.mtx);
 622
 623         rcu_read_lock();
 624
 625         list_for_each_entry_rcu(sta, &local->sta_list, list) {
 626                 if (sta->sdata == sdata &&
 627                     time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
 628                                jiffies)) {
 629                         active++;
 630                         break;
 631                 }
 632         }
 633
 634         rcu_read_unlock();
 635
 636         return active;
 637 }
 638
 639 /*
 640  * This function is called with state == IEEE80211_IBSS_MLME_JOINED
 641  */
 642
 643 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
 644 {
 645         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 646
 647         lockdep_assert_held(&ifibss->mtx);
 648
 649         mod_timer(&ifibss->timer,
 650                   round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
 651
 652         ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT);
 653
 654         if (time_before(jiffies, ifibss->last_scan_completed +
 655                        IEEE80211_IBSS_MERGE_INTERVAL))
 656                 return;
 657
 658         if (ieee80211_sta_active_ibss(sdata))
 659                 return;
 660
 661         if (ifibss->fixed_channel)
 662                 return;
 663
 664         printk(KERN_DEBUG "%s: No active IBSS STAs - trying to scan for other "
 665                "IBSS networks with same SSID (merge)\n", sdata->name);
 666
 667         ieee80211_request_internal_scan(sdata,
 668                         ifibss->ssid, ifibss->ssid_len, NULL);
 669 }
 670
 671 static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
 672 {
 673         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 674         u8 bssid[ETH_ALEN];
 675         u16 capability;
 676         int i;
 677
 678         lockdep_assert_held(&ifibss->mtx);
 679
 680         if (ifibss->fixed_bssid) {
 681                 memcpy(bssid, ifibss->bssid, ETH_ALEN);
 682         } else {
 683                 /* Generate random, not broadcast, locally administered BSSID. Mix in
 684                  * own MAC address to make sure that devices that do not have proper
 685                  * random number generator get different BSSID. */
 686                 get_random_bytes(bssid, ETH_ALEN);
 687                 for (i = 0; i < ETH_ALEN; i++)
 688                         bssid[i] ^= sdata->vif.addr[i];
 689                 bssid[0] &= ~0x01;
 690                 bssid[0] |= 0x02;
 691         }
 692
 693         printk(KERN_DEBUG "%s: Creating new IBSS network, BSSID %pM\n",
 694                sdata->name, bssid);
 695
 696         capability = WLAN_CAPABILITY_IBSS;
 697
 698         if (ifibss->privacy)
 699                 capability |= WLAN_CAPABILITY_PRIVACY;
 700         else
 701                 sdata->drop_unencrypted = 0;
 702
 703         __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int,
 704                                   ifibss->channel, ifibss->basic_rates,
 705                                   capability, 0);
 706 }
 707
 708 /*
 709  * This function is called with state == IEEE80211_IBSS_MLME_SEARCH
 710  */
 711
 712 static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
 713 {
 714         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 715         struct ieee80211_local *local = sdata->local;
 716         struct cfg80211_bss *cbss;
 717         struct ieee80211_channel *chan = NULL;
 718         const u8 *bssid = NULL;
 719         int active_ibss;
 720         u16 capability;
 721
 722         lockdep_assert_held(&ifibss->mtx);
 723
 724         active_ibss = ieee80211_sta_active_ibss(sdata);
 725 #ifdef CONFIG_MAC80211_IBSS_DEBUG
 726         printk(KERN_DEBUG "%s: sta_find_ibss (active_ibss=%d)\n",
 727                sdata->name, active_ibss);
 728 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
 729
 730         if (active_ibss)
 731                 return;
 732
 733         capability = WLAN_CAPABILITY_IBSS;
 734         if (ifibss->privacy)
 735                 capability |= WLAN_CAPABILITY_PRIVACY;
 736         if (ifibss->fixed_bssid)
 737                 bssid = ifibss->bssid;
 738         if (ifibss->fixed_channel)
 739                 chan = ifibss->channel;
 740         if (!is_zero_ether_addr(ifibss->bssid))
 741                 bssid = ifibss->bssid;
 742         cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid,
 743                                 ifibss->ssid, ifibss->ssid_len,
 744                                 WLAN_CAPABILITY_IBSS | WLAN_CAPABILITY_PRIVACY,
 745                                 capability);
 746
 747         if (cbss) {
 748                 struct ieee80211_bss *bss;
 749
 750                 bss = (void *)cbss->priv;
 751 #ifdef CONFIG_MAC80211_IBSS_DEBUG
 752                 printk(KERN_DEBUG "   sta_find_ibss: selected %pM current "
 753                        "%pM\n", cbss->bssid, ifibss->bssid);
 754 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
 755
 756                 printk(KERN_DEBUG "%s: Selected IBSS BSSID %pM"
 757                        " based on configured SSID\n",
 758                        sdata->name, cbss->bssid);
 759
 760                 ieee80211_sta_join_ibss(sdata, bss);
 761                 ieee80211_rx_bss_put(local, bss);
 762                 return;
 763         }
 764
 765 #ifdef CONFIG_MAC80211_IBSS_DEBUG
 766         printk(KERN_DEBUG "   did not try to join ibss\n");
 767 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
 768
 769         /* Selected IBSS not found in current scan results - try to scan */
 770         if (time_after(jiffies, ifibss->last_scan_completed +
 771                                         IEEE80211_SCAN_INTERVAL)) {
 772                 printk(KERN_DEBUG "%s: Trigger new scan to find an IBSS to "
 773                        "join\n", sdata->name);
 774
 775                 ieee80211_request_internal_scan(sdata,
 776                                 ifibss->ssid, ifibss->ssid_len,
 777                                 ifibss->fixed_channel ? ifibss->channel : NULL);
 778         } else {
 779                 int interval = IEEE80211_SCAN_INTERVAL;
 780
 781                 if (time_after(jiffies, ifibss->ibss_join_req +
 782                                IEEE80211_IBSS_JOIN_TIMEOUT)) {
 783                         if (!(local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS)) {
 784                                 ieee80211_sta_create_ibss(sdata);
 785                                 return;
 786                         }
 787                         printk(KERN_DEBUG "%s: IBSS not allowed on"
 788                                " %d MHz\n", sdata->name,
 789                                local->hw.conf.channel->center_freq);
 790
 791                         /* No IBSS found - decrease scan interval and continue
 792                          * scanning. */
 793                         interval = IEEE80211_SCAN_INTERVAL_SLOW;
 794                 }
 795
 796                 mod_timer(&ifibss->timer,
 797                           round_jiffies(jiffies + interval));
 798         }
 799 }
 800
 801 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
 802                                         struct sk_buff *req)
 803 {
 804         struct ieee80211_mgmt *mgmt = (void *)req->data;
 805         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 806         struct ieee80211_local *local = sdata->local;
 807         int tx_last_beacon, len = req->len;
 808         struct sk_buff *skb;
 809         struct ieee80211_mgmt *resp;
 810         struct sk_buff *presp;
 811         u8 *pos, *end;
 812
 813         lockdep_assert_held(&ifibss->mtx);
 814
 815         presp = rcu_dereference_protected(ifibss->presp,
 816                                           lockdep_is_held(&ifibss->mtx));
 817
 818         if (ifibss->state != IEEE80211_IBSS_MLME_JOINED ||
 819             len < 24 + 2 || !presp)
 820                 return;
 821
 822         tx_last_beacon = drv_tx_last_beacon(local);
 823
 824 #ifdef CONFIG_MAC80211_IBSS_DEBUG
 825         printk(KERN_DEBUG "%s: RX ProbeReq SA=%pM DA=%pM BSSID=%pM"
 826                " (tx_last_beacon=%d)\n",
 827                sdata->name, mgmt->sa, mgmt->da,
 828                mgmt->bssid, tx_last_beacon);
 829 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
 830
 831         if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da))
 832                 return;
 833
 834         if (compare_ether_addr(mgmt->bssid, ifibss->bssid) != 0 &&
 835             !is_broadcast_ether_addr(mgmt->bssid))
 836                 return;
 837
 838         end = ((u8 *) mgmt) + len;
 839         pos = mgmt->u.probe_req.variable;
 840         if (pos[0] != WLAN_EID_SSID ||
 841             pos + 2 + pos[1] > end) {
 842 #ifdef CONFIG_MAC80211_IBSS_DEBUG
 843                 printk(KERN_DEBUG "%s: Invalid SSID IE in ProbeReq "
 844                        "from %pM\n",
 845                        sdata->name, mgmt->sa);
 846 #endif
 847                 return;
 848         }
 849         if (pos[1] != 0 &&
 850             (pos[1] != ifibss->ssid_len ||
 851              memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) {
 852                 /* Ignore ProbeReq for foreign SSID */
 853                 return;
 854         }
 855
 856         /* Reply with ProbeResp */
 857         skb = skb_copy(presp, GFP_KERNEL);
 858         if (!skb)
 859                 return;
 860
 861         resp = (struct ieee80211_mgmt *) skb->data;
 862         memcpy(resp->da, mgmt->sa, ETH_ALEN);
 863 #ifdef CONFIG_MAC80211_IBSS_DEBUG
 864         printk(KERN_DEBUG "%s: Sending ProbeResp to %pM\n",
 865                sdata->name, resp->da);
 866 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
 867         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 868         ieee80211_tx_skb(sdata, skb);
 869 }
 870
 871 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
 872                                          struct ieee80211_mgmt *mgmt,
 873                                          size_t len,
 874                                          struct ieee80211_rx_status *rx_status)
 875 {
 876         size_t baselen;
 877         struct ieee802_11_elems elems;
 878
 879         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
 880         if (baselen > len)
 881                 return;
 882
 883         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
 884                                 &elems);
 885
 886         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
 887 }
 888
 889 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
 890                                      struct ieee80211_mgmt *mgmt,
 891                                      size_t len,
 892                                      struct ieee80211_rx_status *rx_status)
 893 {
 894         size_t baselen;
 895         struct ieee802_11_elems elems;
 896
 897         /* Process beacon from the current BSS */
 898         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
 899         if (baselen > len)
 900                 return;
 901
 902         ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems);
 903
 904         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true);
 905 }
 906
 907 void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
 908                                    struct sk_buff *skb)
 909 {
 910         struct ieee80211_rx_status *rx_status;
 911         struct ieee80211_mgmt *mgmt;
 912         u16 fc;
 913
 914         rx_status = IEEE80211_SKB_RXCB(skb);
 915         mgmt = (struct ieee80211_mgmt *) skb->data;
 916         fc = le16_to_cpu(mgmt->frame_control);
 917
 918         mutex_lock(&sdata->u.ibss.mtx);
 919
 920         if (!sdata->u.ibss.ssid_len)
 921                 goto mgmt_out; /* not ready to merge yet */
 922
 923         switch (fc & IEEE80211_FCTL_STYPE) {
 924         case IEEE80211_STYPE_PROBE_REQ:
 925                 ieee80211_rx_mgmt_probe_req(sdata, skb);
 926                 break;
 927         case IEEE80211_STYPE_PROBE_RESP:
 928                 ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len,
 929                                              rx_status);
 930                 break;
 931         case IEEE80211_STYPE_BEACON:
 932                 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
 933                                          rx_status);
 934                 break;
 935         case IEEE80211_STYPE_AUTH:
 936                 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len);
 937                 break;
 938         }
 939
 940  mgmt_out:
 941         mutex_unlock(&sdata->u.ibss.mtx);
 942 }
 943
 944 void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata)
 945 {
 946         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 947         struct sta_info *sta;
 948
 949         mutex_lock(&ifibss->mtx);
 950
 951         /*
 952          * Work could be scheduled after scan or similar
 953          * when we aren't even joined (or trying) with a
 954          * network.
 955          */
 956         if (!ifibss->ssid_len)
 957                 goto out;
 958
 959         spin_lock_bh(&ifibss->incomplete_lock);
 960         while (!list_empty(&ifibss->incomplete_stations)) {
 961                 sta = list_first_entry(&ifibss->incomplete_stations,
 962                                        struct sta_info, list);
 963                 list_del(&sta->list);
 964                 spin_unlock_bh(&ifibss->incomplete_lock);
 965
 966                 ieee80211_ibss_finish_sta(sta, true);
 967                 rcu_read_unlock();
 968                 spin_lock_bh(&ifibss->incomplete_lock);
 969         }
 970         spin_unlock_bh(&ifibss->incomplete_lock);
 971
 972         switch (ifibss->state) {
 973         case IEEE80211_IBSS_MLME_SEARCH:
 974                 ieee80211_sta_find_ibss(sdata);
 975                 break;
 976         case IEEE80211_IBSS_MLME_JOINED:
 977                 ieee80211_sta_merge_ibss(sdata);
 978                 break;
 979         default:
 980                 WARN_ON(1);
 981                 break;
 982         }
 983
 984  out:
 985         mutex_unlock(&ifibss->mtx);
 986 }
 987
 988 static void ieee80211_ibss_timer(unsigned long data)
 989 {
 990         struct ieee80211_sub_if_data *sdata =
 991                 (struct ieee80211_sub_if_data *) data;
 992         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 993         struct ieee80211_local *local = sdata->local;
 994
 995         if (local->quiescing) {
 996                 ifibss->timer_running = true;
 997                 return;
 998         }
 999
1000         ieee80211_queue_work(&local->hw, &sdata->work);
1001 }
1002
1003 #ifdef CONFIG_PM
1004 void ieee80211_ibss_quiesce(struct ieee80211_sub_if_data *sdata)
1005 {
1006         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1007
1008         if (del_timer_sync(&ifibss->timer))
1009                 ifibss->timer_running = true;
1010 }
1011
1012 void ieee80211_ibss_restart(struct ieee80211_sub_if_data *sdata)
1013 {
1014         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1015
1016         if (ifibss->timer_running) {
1017                 add_timer(&ifibss->timer);
1018                 ifibss->timer_running = false;
1019         }
1020 }
1021 #endif
1022
1023 void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata)
1024 {
1025         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1026
1027         setup_timer(&ifibss->timer, ieee80211_ibss_timer,
1028                     (unsigned long) sdata);
1029         mutex_init(&ifibss->mtx);
1030         INIT_LIST_HEAD(&ifibss->incomplete_stations);
1031         spin_lock_init(&ifibss->incomplete_lock);
1032 }
1033
1034 /* scan finished notification */
1035 void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local)
1036 {
1037         struct ieee80211_sub_if_data *sdata;
1038
1039         mutex_lock(&local->iflist_mtx);
1040         list_for_each_entry(sdata, &local->interfaces, list) {
1041                 if (!ieee80211_sdata_running(sdata))
1042                         continue;
1043                 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
1044                         continue;
1045                 sdata->u.ibss.last_scan_completed = jiffies;
1046                 ieee80211_queue_work(&local->hw, &sdata->work);
1047         }
1048         mutex_unlock(&local->iflist_mtx);
1049 }
1050
1051 int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
1052                         struct cfg80211_ibss_params *params)
1053 {
1054         struct sk_buff *skb;
1055         u32 changed = 0;
1056
1057         skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom +
1058                             sizeof(struct ieee80211_hdr_3addr) +
1059                             12 /* struct ieee80211_mgmt.u.beacon */ +
1060                             2 + IEEE80211_MAX_SSID_LEN /* max SSID */ +
1061                             2 + 8 /* max Supported Rates */ +
1062                             3 /* max DS params */ +
1063                             4 /* IBSS params */ +
1064                             2 + (IEEE80211_MAX_SUPP_RATES - 8) +
1065                             2 + sizeof(struct ieee80211_ht_cap) +
1066                             2 + sizeof(struct ieee80211_ht_info) +
1067                             params->ie_len);
1068         if (!skb)
1069                 return -ENOMEM;
1070
1071         mutex_lock(&sdata->u.ibss.mtx);
1072
1073         if (params->bssid) {
1074                 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN);
1075                 sdata->u.ibss.fixed_bssid = true;
1076         } else
1077                 sdata->u.ibss.fixed_bssid = false;
1078
1079         sdata->u.ibss.privacy = params->privacy;
1080         sdata->u.ibss.control_port = params->control_port;
1081         sdata->u.ibss.basic_rates = params->basic_rates;
1082         memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate,
1083                sizeof(params->mcast_rate));
1084
1085         sdata->vif.bss_conf.beacon_int = params->beacon_interval;
1086
1087         sdata->u.ibss.channel = params->channel;
1088         sdata->u.ibss.channel_type = params->channel_type;
1089         sdata->u.ibss.fixed_channel = params->channel_fixed;
1090
1091         /* fix ourselves to that channel now already */
1092         if (params->channel_fixed) {
1093                 sdata->local->oper_channel = params->channel;
1094                 if (!ieee80211_set_channel_type(sdata->local, sdata,
1095                                                params->channel_type)) {
1096                         mutex_unlock(&sdata->u.ibss.mtx);
1097                         kfree_skb(skb);
1098                         return -EINVAL;
1099                 }
1100         }
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         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1140
1141         return 0;
1142 }
1143
1144 int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata)
1145 {
1146         struct sk_buff *skb;
1147         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1148         struct ieee80211_local *local = sdata->local;
1149         struct cfg80211_bss *cbss;
1150         u16 capability;
1151         int active_ibss;
1152         struct sta_info *sta;
1153
1154         mutex_lock(&sdata->u.ibss.mtx);
1155
1156         sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
1157         memset(sdata->u.ibss.bssid, 0, ETH_ALEN);
1158         sdata->u.ibss.ssid_len = 0;
1159
1160         active_ibss = ieee80211_sta_active_ibss(sdata);
1161
1162         if (!active_ibss && !is_zero_ether_addr(ifibss->bssid)) {
1163                 capability = WLAN_CAPABILITY_IBSS;
1164
1165                 if (ifibss->privacy)
1166                         capability |= WLAN_CAPABILITY_PRIVACY;
1167
1168                 cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->channel,
1169                                         ifibss->bssid, ifibss->ssid,
1170                                         ifibss->ssid_len, WLAN_CAPABILITY_IBSS |
1171                                         WLAN_CAPABILITY_PRIVACY,
1172                                         capability);
1173
1174                 if (cbss) {
1175                         cfg80211_unlink_bss(local->hw.wiphy, cbss);
1176                         cfg80211_put_bss(cbss);
1177                 }
1178         }
1179
1180         sta_info_flush(sdata->local, sdata);
1181
1182         spin_lock_bh(&ifibss->incomplete_lock);
1183         while (!list_empty(&ifibss->incomplete_stations)) {
1184                 sta = list_first_entry(&ifibss->incomplete_stations,
1185                                        struct sta_info, list);
1186                 list_del(&sta->list);
1187                 spin_unlock_bh(&ifibss->incomplete_lock);
1188
1189                 sta_info_free(local, sta);
1190                 spin_lock_bh(&ifibss->incomplete_lock);
1191         }
1192         spin_unlock_bh(&ifibss->incomplete_lock);
1193
1194         netif_carrier_off(sdata->dev);
1195
1196         /* remove beacon */
1197         kfree(sdata->u.ibss.ie);
1198         skb = rcu_dereference_protected(sdata->u.ibss.presp,
1199                                         lockdep_is_held(&sdata->u.ibss.mtx));
1200         RCU_INIT_POINTER(sdata->u.ibss.presp, NULL);
1201         sdata->vif.bss_conf.ibss_joined = false;
1202         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED |
1203                                                 BSS_CHANGED_IBSS);
1204         synchronize_rcu();
1205         kfree_skb(skb);
1206
1207         skb_queue_purge(&sdata->skb_queue);
1208
1209         del_timer_sync(&sdata->u.ibss.timer);
1210
1211         mutex_unlock(&sdata->u.ibss.mtx);
1212
1213         mutex_lock(&local->mtx);
1214         ieee80211_recalc_idle(sdata->local);
1215         mutex_unlock(&local->mtx);
1216
1217         return 0;
1218 }