net/mac80211/ibss.c

   1 /*
   2  * IBSS mode implementation
   3  * Copyright 2003-2008, Jouni Malinen <[email protected]>
   4  * Copyright 2004, Instant802 Networks, Inc.
   5  * Copyright 2005, Devicescape Software, Inc.
   6  * Copyright 2006-2007  Jiri Benc <[email protected]>
   7  * Copyright 2007, Michael Wu <[email protected]>
   8  * Copyright 2009, Johannes Berg <[email protected]>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2 as
  12  * published by the Free Software Foundation.
  13  */
  14
  15 #include <linux/delay.h>
  16 #include <linux/slab.h>
  17 #include <linux/if_ether.h>
  18 #include <linux/skbuff.h>
  19 #include <linux/if_arp.h>
  20 #include <linux/etherdevice.h>
  21 #include <linux/rtnetlink.h>
  22 #include <net/mac80211.h>
  23
  24 #include "ieee80211_i.h"
  25 #include "driver-ops.h"
  26 #include "rate.h"
  27
  28 #define IEEE80211_SCAN_INTERVAL (2 * HZ)
  29 #define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ)
  30
  31 #define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ)
  32 #define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ)
  33 #define IEEE80211_IBSS_RSN_INACTIVITY_LIMIT (10 * HZ)
  34
  35 #define IEEE80211_IBSS_MAX_STA_ENTRIES 128
  36
  37 static struct beacon_data *
  38 ieee80211_ibss_build_presp(struct ieee80211_sub_if_data *sdata,
  39                            const int beacon_int, const u32 basic_rates,
  40                            const u16 capability, u64 tsf,
  41                            struct cfg80211_chan_def *chandef,
  42                            bool *have_higher_than_11mbit)
  43 {
  44         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
  45         struct ieee80211_local *local = sdata->local;
  46         int rates_n = 0, i, ri;
  47         struct ieee80211_mgmt *mgmt;
  48         u8 *pos;
  49         struct ieee80211_supported_band *sband;
  50         u32 rate_flags, rates = 0, rates_added = 0;
  51         struct beacon_data *presp;
  52         int frame_len;
  53         int shift;
  54
  55         /* Build IBSS probe response */
  56         frame_len = sizeof(struct ieee80211_hdr_3addr) +
  57                     12 /* struct ieee80211_mgmt.u.beacon */ +
  58                     2 + IEEE80211_MAX_SSID_LEN /* max SSID */ +
  59                     2 + 8 /* max Supported Rates */ +
  60                     3 /* max DS params */ +
  61                     4 /* IBSS params */ +
  62                     2 + (IEEE80211_MAX_SUPP_RATES - 8) +
  63                     2 + sizeof(struct ieee80211_ht_cap) +
  64                     2 + sizeof(struct ieee80211_ht_operation) +
  65                     ifibss->ie_len;
  66         presp = kzalloc(sizeof(*presp) + frame_len, GFP_KERNEL);
  67         if (!presp)
  68                 return NULL;
  69
  70         presp->head = (void *)(presp + 1);
  71
  72         mgmt = (void *) presp->head;
  73         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
  74                                           IEEE80211_STYPE_PROBE_RESP);
  75         eth_broadcast_addr(mgmt->da);
  76         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
  77         memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN);
  78         mgmt->u.beacon.beacon_int = cpu_to_le16(beacon_int);
  79         mgmt->u.beacon.timestamp = cpu_to_le64(tsf);
  80         mgmt->u.beacon.capab_info = cpu_to_le16(capability);
  81
  82         pos = (u8 *)mgmt + offsetof(struct ieee80211_mgmt, u.beacon.variable);
  83
  84         *pos++ = WLAN_EID_SSID;
  85         *pos++ = ifibss->ssid_len;
  86         memcpy(pos, ifibss->ssid, ifibss->ssid_len);
  87         pos += ifibss->ssid_len;
  88
  89         sband = local->hw.wiphy->bands[chandef->chan->band];
  90         rate_flags = ieee80211_chandef_rate_flags(chandef);
  91         shift = ieee80211_chandef_get_shift(chandef);
  92         rates_n = 0;
  93         if (have_higher_than_11mbit)
  94                 *have_higher_than_11mbit = false;
  95
  96         for (i = 0; i < sband->n_bitrates; i++) {
  97                 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
  98                         continue;
  99                 if (sband->bitrates[i].bitrate > 110 &&
 100                     have_higher_than_11mbit)
 101                         *have_higher_than_11mbit = true;
 102
 103                 rates |= BIT(i);
 104                 rates_n++;
 105         }
 106
 107         *pos++ = WLAN_EID_SUPP_RATES;
 108         *pos++ = min_t(int, 8, rates_n);
 109         for (ri = 0; ri < sband->n_bitrates; ri++) {
 110                 int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate,
 111                                         5 * (1 << shift));
 112                 u8 basic = 0;
 113                 if (!(rates & BIT(ri)))
 114                         continue;
 115
 116                 if (basic_rates & BIT(ri))
 117                         basic = 0x80;
 118                 *pos++ = basic | (u8) rate;
 119                 if (++rates_added == 8) {
 120                         ri++; /* continue at next rate for EXT_SUPP_RATES */
 121                         break;
 122                 }
 123         }
 124
 125         if (sband->band == IEEE80211_BAND_2GHZ) {
 126                 *pos++ = WLAN_EID_DS_PARAMS;
 127                 *pos++ = 1;
 128                 *pos++ = ieee80211_frequency_to_channel(
 129                                 chandef->chan->center_freq);
 130         }
 131
 132         *pos++ = WLAN_EID_IBSS_PARAMS;
 133         *pos++ = 2;
 134         /* FIX: set ATIM window based on scan results */
 135         *pos++ = 0;
 136         *pos++ = 0;
 137
 138         /* put the remaining rates in WLAN_EID_EXT_SUPP_RATES */
 139         if (rates_n > 8) {
 140                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 141                 *pos++ = rates_n - 8;
 142                 for (; ri < sband->n_bitrates; ri++) {
 143                         int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate,
 144                                                 5 * (1 << shift));
 145                         u8 basic = 0;
 146                         if (!(rates & BIT(ri)))
 147                                 continue;
 148
 149                         if (basic_rates & BIT(ri))
 150                                 basic = 0x80;
 151                         *pos++ = basic | (u8) rate;
 152                 }
 153         }
 154
 155         if (ifibss->ie_len) {
 156                 memcpy(pos, ifibss->ie, ifibss->ie_len);
 157                 pos += ifibss->ie_len;
 158         }
 159
 160         /* add HT capability and information IEs */
 161         if (chandef->width != NL80211_CHAN_WIDTH_20_NOHT &&
 162             chandef->width != NL80211_CHAN_WIDTH_5 &&
 163             chandef->width != NL80211_CHAN_WIDTH_10 &&
 164             sband->ht_cap.ht_supported) {
 165                 struct ieee80211_sta_ht_cap ht_cap;
 166
 167                 memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
 168                 ieee80211_apply_htcap_overrides(sdata, &ht_cap);
 169
 170                 pos = ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap);
 171                 /*
 172                  * Note: According to 802.11n-2009 9.13.3.1, HT Protection
 173                  * field and RIFS Mode are reserved in IBSS mode, therefore
 174                  * keep them at 0
 175                  */
 176                 pos = ieee80211_ie_build_ht_oper(pos, &sband->ht_cap,
 177                                                  chandef, 0);
 178         }
 179
 180         if (local->hw.queues >= IEEE80211_NUM_ACS) {
 181                 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
 182                 *pos++ = 7; /* len */
 183                 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
 184                 *pos++ = 0x50;
 185                 *pos++ = 0xf2;
 186                 *pos++ = 2; /* WME */
 187                 *pos++ = 0; /* WME info */
 188                 *pos++ = 1; /* WME ver */
 189                 *pos++ = 0; /* U-APSD no in use */
 190         }
 191
 192         presp->head_len = pos - presp->head;
 193         if (WARN_ON(presp->head_len > frame_len))
 194                 goto error;
 195
 196         return presp;
 197 error:
 198         kfree(presp);
 199         return NULL;
 200 }
 201
 202 static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
 203                                       const u8 *bssid, const int beacon_int,
 204                                       struct ieee80211_channel *chan,
 205                                       const u32 basic_rates,
 206                                       const u16 capability, u64 tsf,
 207                                       bool creator)
 208 {
 209         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 210         struct ieee80211_local *local = sdata->local;
 211         struct ieee80211_supported_band *sband;
 212         struct ieee80211_mgmt *mgmt;
 213         struct cfg80211_bss *bss;
 214         u32 bss_change;
 215         struct cfg80211_chan_def chandef;
 216         struct beacon_data *presp;
 217         enum nl80211_bss_scan_width scan_width;
 218         bool have_higher_than_11mbit;
 219
 220         sdata_assert_lock(sdata);
 221
 222         /* Reset own TSF to allow time synchronization work. */
 223         drv_reset_tsf(local, sdata);
 224
 225         if (!ether_addr_equal(ifibss->bssid, bssid))
 226                 sta_info_flush(sdata);
 227
 228         /* if merging, indicate to driver that we leave the old IBSS */
 229         if (sdata->vif.bss_conf.ibss_joined) {
 230                 sdata->vif.bss_conf.ibss_joined = false;
 231                 sdata->vif.bss_conf.ibss_creator = false;
 232                 sdata->vif.bss_conf.enable_beacon = false;
 233                 netif_carrier_off(sdata->dev);
 234                 ieee80211_bss_info_change_notify(sdata,
 235                                                  BSS_CHANGED_IBSS |
 236                                                  BSS_CHANGED_BEACON_ENABLED);
 237         }
 238
 239         presp = rcu_dereference_protected(ifibss->presp,
 240                                           lockdep_is_held(&sdata->wdev.mtx));
 241         rcu_assign_pointer(ifibss->presp, NULL);
 242         if (presp)
 243                 kfree_rcu(presp, rcu_head);
 244
 245         sdata->drop_unencrypted = capability & WLAN_CAPABILITY_PRIVACY ? 1 : 0;
 246
 247         chandef = ifibss->chandef;
 248         if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef)) {
 249                 if (chandef.width == NL80211_CHAN_WIDTH_5 ||
 250                     chandef.width == NL80211_CHAN_WIDTH_10 ||
 251                     chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
 252                     chandef.width == NL80211_CHAN_WIDTH_20) {
 253                         sdata_info(sdata,
 254                                    "Failed to join IBSS, beacons forbidden\n");
 255                         return;
 256                 }
 257                 chandef.width = NL80211_CHAN_WIDTH_20;
 258                 chandef.center_freq1 = chan->center_freq;
 259         }
 260
 261         ieee80211_vif_release_channel(sdata);
 262         if (ieee80211_vif_use_channel(sdata, &chandef,
 263                                       ifibss->fixed_channel ?
 264                                         IEEE80211_CHANCTX_SHARED :
 265                                         IEEE80211_CHANCTX_EXCLUSIVE)) {
 266                 sdata_info(sdata, "Failed to join IBSS, no channel context\n");
 267                 return;
 268         }
 269
 270         memcpy(ifibss->bssid, bssid, ETH_ALEN);
 271
 272         sband = local->hw.wiphy->bands[chan->band];
 273
 274         presp = ieee80211_ibss_build_presp(sdata, beacon_int, basic_rates,
 275                                            capability, tsf, &chandef,
 276                                            &have_higher_than_11mbit);
 277         if (!presp)
 278                 return;
 279
 280         rcu_assign_pointer(ifibss->presp, presp);
 281         mgmt = (void *)presp->head;
 282
 283         sdata->vif.bss_conf.enable_beacon = true;
 284         sdata->vif.bss_conf.beacon_int = beacon_int;
 285         sdata->vif.bss_conf.basic_rates = basic_rates;
 286         sdata->vif.bss_conf.ssid_len = ifibss->ssid_len;
 287         memcpy(sdata->vif.bss_conf.ssid, ifibss->ssid, ifibss->ssid_len);
 288         bss_change = BSS_CHANGED_BEACON_INT;
 289         bss_change |= ieee80211_reset_erp_info(sdata);
 290         bss_change |= BSS_CHANGED_BSSID;
 291         bss_change |= BSS_CHANGED_BEACON;
 292         bss_change |= BSS_CHANGED_BEACON_ENABLED;
 293         bss_change |= BSS_CHANGED_BASIC_RATES;
 294         bss_change |= BSS_CHANGED_HT;
 295         bss_change |= BSS_CHANGED_IBSS;
 296         bss_change |= BSS_CHANGED_SSID;
 297
 298         /*
 299          * In 5 GHz/802.11a, we can always use short slot time.
 300          * (IEEE 802.11-2012 18.3.8.7)
 301          *
 302          * In 2.4GHz, we must always use long slots in IBSS for compatibility
 303          * reasons.
 304          * (IEEE 802.11-2012 19.4.5)
 305          *
 306          * HT follows these specifications (IEEE 802.11-2012 20.3.18)
 307          */
 308         sdata->vif.bss_conf.use_short_slot = chan->band == IEEE80211_BAND_5GHZ;
 309         bss_change |= BSS_CHANGED_ERP_SLOT;
 310
 311         /* cf. IEEE 802.11 9.2.12 */
 312         if (chan->band == IEEE80211_BAND_2GHZ && have_higher_than_11mbit)
 313                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
 314         else
 315                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
 316
 317         sdata->vif.bss_conf.ibss_joined = true;
 318         sdata->vif.bss_conf.ibss_creator = creator;
 319         ieee80211_bss_info_change_notify(sdata, bss_change);
 320
 321         ieee80211_set_wmm_default(sdata, true);
 322
 323         ifibss->state = IEEE80211_IBSS_MLME_JOINED;
 324         mod_timer(&ifibss->timer,
 325                   round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
 326
 327         scan_width = cfg80211_chandef_to_scan_width(&chandef);
 328         bss = cfg80211_inform_bss_width_frame(local->hw.wiphy, chan,
 329                                               scan_width, mgmt,
 330                                               presp->head_len, 0, GFP_KERNEL);
 331         cfg80211_put_bss(local->hw.wiphy, bss);
 332         netif_carrier_on(sdata->dev);
 333         cfg80211_ibss_joined(sdata->dev, ifibss->bssid, GFP_KERNEL);
 334 }
 335
 336 static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
 337                                     struct ieee80211_bss *bss)
 338 {
 339         struct cfg80211_bss *cbss =
 340                 container_of((void *)bss, struct cfg80211_bss, priv);
 341         struct ieee80211_supported_band *sband;
 342         u32 basic_rates;
 343         int i, j;
 344         u16 beacon_int = cbss->beacon_interval;
 345         const struct cfg80211_bss_ies *ies;
 346         u64 tsf;
 347         u32 rate_flags;
 348         int shift;
 349
 350         sdata_assert_lock(sdata);
 351
 352         if (beacon_int < 10)
 353                 beacon_int = 10;
 354
 355         sband = sdata->local->hw.wiphy->bands[cbss->channel->band];
 356         rate_flags = ieee80211_chandef_rate_flags(&sdata->u.ibss.chandef);
 357         shift = ieee80211_vif_get_shift(&sdata->vif);
 358
 359         basic_rates = 0;
 360
 361         for (i = 0; i < bss->supp_rates_len; i++) {
 362                 int rate = bss->supp_rates[i] & 0x7f;
 363                 bool is_basic = !!(bss->supp_rates[i] & 0x80);
 364
 365                 for (j = 0; j < sband->n_bitrates; j++) {
 366                         int brate;
 367                         if ((rate_flags & sband->bitrates[j].flags)
 368                             != rate_flags)
 369                                 continue;
 370
 371                         brate = DIV_ROUND_UP(sband->bitrates[j].bitrate,
 372                                              5 * (1 << shift));
 373                         if (brate == rate) {
 374                                 if (is_basic)
 375                                         basic_rates |= BIT(j);
 376                                 break;
 377                         }
 378                 }
 379         }
 380
 381         rcu_read_lock();
 382         ies = rcu_dereference(cbss->ies);
 383         tsf = ies->tsf;
 384         rcu_read_unlock();
 385
 386         __ieee80211_sta_join_ibss(sdata, cbss->bssid,
 387                                   beacon_int,
 388                                   cbss->channel,
 389                                   basic_rates,
 390                                   cbss->capability,
 391                                   tsf, false);
 392 }
 393
 394 static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta)
 395         __acquires(RCU)
 396 {
 397         struct ieee80211_sub_if_data *sdata = sta->sdata;
 398         u8 addr[ETH_ALEN];
 399
 400         memcpy(addr, sta->sta.addr, ETH_ALEN);
 401
 402         ibss_dbg(sdata, "Adding new IBSS station %pM\n", addr);
 403
 404         sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
 405         sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
 406         /* authorize the station only if the network is not RSN protected. If
 407          * not wait for the userspace to authorize it */
 408         if (!sta->sdata->u.ibss.control_port)
 409                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
 410
 411         rate_control_rate_init(sta);
 412
 413         /* If it fails, maybe we raced another insertion? */
 414         if (sta_info_insert_rcu(sta))
 415                 return sta_info_get(sdata, addr);
 416         return sta;
 417 }
 418
 419 static struct sta_info *
 420 ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, const u8 *bssid,
 421                        const u8 *addr, u32 supp_rates)
 422         __acquires(RCU)
 423 {
 424         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 425         struct ieee80211_local *local = sdata->local;
 426         struct sta_info *sta;
 427         struct ieee80211_chanctx_conf *chanctx_conf;
 428         struct ieee80211_supported_band *sband;
 429         enum nl80211_bss_scan_width scan_width;
 430         int band;
 431
 432         /*
 433          * XXX: Consider removing the least recently used entry and
 434          *      allow new one to be added.
 435          */
 436         if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
 437                 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
 438                                     sdata->name, addr);
 439                 rcu_read_lock();
 440                 return NULL;
 441         }
 442
 443         if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) {
 444                 rcu_read_lock();
 445                 return NULL;
 446         }
 447
 448         if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) {
 449                 rcu_read_lock();
 450                 return NULL;
 451         }
 452
 453         rcu_read_lock();
 454         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 455         if (WARN_ON_ONCE(!chanctx_conf))
 456                 return NULL;
 457         band = chanctx_conf->def.chan->band;
 458         scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
 459         rcu_read_unlock();
 460
 461         sta = sta_info_alloc(sdata, addr, GFP_KERNEL);
 462         if (!sta) {
 463                 rcu_read_lock();
 464                 return NULL;
 465         }
 466
 467         sta->last_rx = jiffies;
 468
 469         /* make sure mandatory rates are always added */
 470         sband = local->hw.wiphy->bands[band];
 471         sta->sta.supp_rates[band] = supp_rates |
 472                         ieee80211_mandatory_rates(sband, scan_width);
 473
 474         return ieee80211_ibss_finish_sta(sta);
 475 }
 476
 477 static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data *sdata,
 478                                           struct ieee80211_mgmt *mgmt,
 479                                           size_t len)
 480 {
 481         u16 reason = le16_to_cpu(mgmt->u.deauth.reason_code);
 482
 483         if (len < IEEE80211_DEAUTH_FRAME_LEN)
 484                 return;
 485
 486         ibss_dbg(sdata, "RX DeAuth SA=%pM DA=%pM BSSID=%pM (reason: %d)\n",
 487                  mgmt->sa, mgmt->da, mgmt->bssid, reason);
 488         sta_info_destroy_addr(sdata, mgmt->sa);
 489 }
 490
 491 static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata,
 492                                         struct ieee80211_mgmt *mgmt,
 493                                         size_t len)
 494 {
 495         u16 auth_alg, auth_transaction;
 496
 497         sdata_assert_lock(sdata);
 498
 499         if (len < 24 + 6)
 500                 return;
 501
 502         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
 503         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
 504
 505         ibss_dbg(sdata,
 506                  "RX Auth SA=%pM DA=%pM BSSID=%pM (auth_transaction=%d)\n",
 507                  mgmt->sa, mgmt->da, mgmt->bssid, auth_transaction);
 508
 509         if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
 510                 return;
 511
 512         /*
 513          * IEEE 802.11 standard does not require authentication in IBSS
 514          * networks and most implementations do not seem to use it.
 515          * However, try to reply to authentication attempts if someone
 516          * has actually implemented this.
 517          */
 518         ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, 0, NULL, 0,
 519                             mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0, 0);
 520 }
 521
 522 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
 523                                   struct ieee80211_mgmt *mgmt, size_t len,
 524                                   struct ieee80211_rx_status *rx_status,
 525                                   struct ieee802_11_elems *elems)
 526 {
 527         struct ieee80211_local *local = sdata->local;
 528         int freq;
 529         struct cfg80211_bss *cbss;
 530         struct ieee80211_bss *bss;
 531         struct sta_info *sta;
 532         struct ieee80211_channel *channel;
 533         u64 beacon_timestamp, rx_timestamp;
 534         u32 supp_rates = 0;
 535         enum ieee80211_band band = rx_status->band;
 536         enum nl80211_bss_scan_width scan_width;
 537         struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band];
 538         bool rates_updated = false;
 539
 540         if (elems->ds_params)
 541                 freq = ieee80211_channel_to_frequency(elems->ds_params[0],
 542                                                       band);
 543         else
 544                 freq = rx_status->freq;
 545
 546         channel = ieee80211_get_channel(local->hw.wiphy, freq);
 547
 548         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
 549                 return;
 550
 551         if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
 552             ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid)) {
 553
 554                 rcu_read_lock();
 555                 sta = sta_info_get(sdata, mgmt->sa);
 556
 557                 if (elems->supp_rates) {
 558                         supp_rates = ieee80211_sta_get_rates(sdata, elems,
 559                                                              band, NULL);
 560                         if (sta) {
 561                                 u32 prev_rates;
 562
 563                                 prev_rates = sta->sta.supp_rates[band];
 564                                 /* make sure mandatory rates are always added */
 565                                 scan_width = NL80211_BSS_CHAN_WIDTH_20;
 566                                 if (rx_status->flag & RX_FLAG_5MHZ)
 567                                         scan_width = NL80211_BSS_CHAN_WIDTH_5;
 568                                 if (rx_status->flag & RX_FLAG_10MHZ)
 569                                         scan_width = NL80211_BSS_CHAN_WIDTH_10;
 570
 571                                 sta->sta.supp_rates[band] = supp_rates |
 572                                         ieee80211_mandatory_rates(sband,
 573                                                                   scan_width);
 574                                 if (sta->sta.supp_rates[band] != prev_rates) {
 575                                         ibss_dbg(sdata,
 576                                                  "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n",
 577                                                  sta->sta.addr, prev_rates,
 578                                                  sta->sta.supp_rates[band]);
 579                                         rates_updated = true;
 580                                 }
 581                         } else {
 582                                 rcu_read_unlock();
 583                                 sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid,
 584                                                 mgmt->sa, supp_rates);
 585                         }
 586                 }
 587
 588                 if (sta && elems->wmm_info)
 589                         set_sta_flag(sta, WLAN_STA_WME);
 590
 591                 if (sta && elems->ht_operation && elems->ht_cap_elem &&
 592                     sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20_NOHT &&
 593                     sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_5 &&
 594                     sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_10) {
 595                         /* we both use HT */
 596                         struct ieee80211_ht_cap htcap_ie;
 597                         struct cfg80211_chan_def chandef;
 598
 599                         ieee80211_ht_oper_to_chandef(channel,
 600                                                      elems->ht_operation,
 601                                                      &chandef);
 602
 603                         memcpy(&htcap_ie, elems->ht_cap_elem, sizeof(htcap_ie));
 604
 605                         /*
 606                          * fall back to HT20 if we don't use or use
 607                          * the other extension channel
 608                          */
 609                         if (chandef.center_freq1 !=
 610                             sdata->u.ibss.chandef.center_freq1)
 611                                 htcap_ie.cap_info &=
 612                                         cpu_to_le16(~IEEE80211_HT_CAP_SUP_WIDTH_20_40);
 613
 614                         rates_updated |= ieee80211_ht_cap_ie_to_sta_ht_cap(
 615                                                 sdata, sband, &htcap_ie, sta);
 616                 }
 617
 618                 if (sta && rates_updated) {
 619                         drv_sta_rc_update(local, sdata, &sta->sta,
 620                                           IEEE80211_RC_SUPP_RATES_CHANGED);
 621                         rate_control_rate_init(sta);
 622                 }
 623
 624                 rcu_read_unlock();
 625         }
 626
 627         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
 628                                         channel);
 629         if (!bss)
 630                 return;
 631
 632         cbss = container_of((void *)bss, struct cfg80211_bss, priv);
 633
 634         /* same for beacon and probe response */
 635         beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp);
 636
 637         /* check if we need to merge IBSS */
 638
 639         /* we use a fixed BSSID */
 640         if (sdata->u.ibss.fixed_bssid)
 641                 goto put_bss;
 642
 643         /* not an IBSS */
 644         if (!(cbss->capability & WLAN_CAPABILITY_IBSS))
 645                 goto put_bss;
 646
 647         /* different channel */
 648         if (sdata->u.ibss.fixed_channel &&
 649             sdata->u.ibss.chandef.chan != cbss->channel)
 650                 goto put_bss;
 651
 652         /* different SSID */
 653         if (elems->ssid_len != sdata->u.ibss.ssid_len ||
 654             memcmp(elems->ssid, sdata->u.ibss.ssid,
 655                                 sdata->u.ibss.ssid_len))
 656                 goto put_bss;
 657
 658         /* same BSSID */
 659         if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid))
 660                 goto put_bss;
 661
 662         if (ieee80211_have_rx_timestamp(rx_status)) {
 663                 /* time when timestamp field was received */
 664                 rx_timestamp =
 665                         ieee80211_calculate_rx_timestamp(local, rx_status,
 666                                                          len + FCS_LEN, 24);
 667         } else {
 668                 /*
 669                  * second best option: get current TSF
 670                  * (will return -1 if not supported)
 671                  */
 672                 rx_timestamp = drv_get_tsf(local, sdata);
 673         }
 674
 675         ibss_dbg(sdata,
 676                  "RX beacon SA=%pM BSSID=%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
 677                  mgmt->sa, mgmt->bssid,
 678                  (unsigned long long)rx_timestamp,
 679                  (unsigned long long)beacon_timestamp,
 680                  (unsigned long long)(rx_timestamp - beacon_timestamp),
 681                  jiffies);
 682
 683         if (beacon_timestamp > rx_timestamp) {
 684                 ibss_dbg(sdata,
 685                          "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n",
 686                          mgmt->bssid);
 687                 ieee80211_sta_join_ibss(sdata, bss);
 688                 supp_rates = ieee80211_sta_get_rates(sdata, elems, band, NULL);
 689                 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa,
 690                                        supp_rates);
 691                 rcu_read_unlock();
 692         }
 693
 694  put_bss:
 695         ieee80211_rx_bss_put(local, bss);
 696 }
 697
 698 void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata,
 699                               const u8 *bssid, const u8 *addr,
 700                               u32 supp_rates)
 701 {
 702         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 703         struct ieee80211_local *local = sdata->local;
 704         struct sta_info *sta;
 705         struct ieee80211_chanctx_conf *chanctx_conf;
 706         struct ieee80211_supported_band *sband;
 707         enum nl80211_bss_scan_width scan_width;
 708         int band;
 709
 710         /*
 711          * XXX: Consider removing the least recently used entry and
 712          *      allow new one to be added.
 713          */
 714         if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
 715                 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
 716                                     sdata->name, addr);
 717                 return;
 718         }
 719
 720         if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH)
 721                 return;
 722
 723         if (!ether_addr_equal(bssid, sdata->u.ibss.bssid))
 724                 return;
 725
 726         rcu_read_lock();
 727         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 728         if (WARN_ON_ONCE(!chanctx_conf)) {
 729                 rcu_read_unlock();
 730                 return;
 731         }
 732         band = chanctx_conf->def.chan->band;
 733         scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
 734         rcu_read_unlock();
 735
 736         sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
 737         if (!sta)
 738                 return;
 739
 740         sta->last_rx = jiffies;
 741
 742         /* make sure mandatory rates are always added */
 743         sband = local->hw.wiphy->bands[band];
 744         sta->sta.supp_rates[band] = supp_rates |
 745                         ieee80211_mandatory_rates(sband, scan_width);
 746
 747         spin_lock(&ifibss->incomplete_lock);
 748         list_add(&sta->list, &ifibss->incomplete_stations);
 749         spin_unlock(&ifibss->incomplete_lock);
 750         ieee80211_queue_work(&local->hw, &sdata->work);
 751 }
 752
 753 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
 754 {
 755         struct ieee80211_local *local = sdata->local;
 756         int active = 0;
 757         struct sta_info *sta;
 758
 759         sdata_assert_lock(sdata);
 760
 761         rcu_read_lock();
 762
 763         list_for_each_entry_rcu(sta, &local->sta_list, list) {
 764                 if (sta->sdata == sdata &&
 765                     time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
 766                                jiffies)) {
 767                         active++;
 768                         break;
 769                 }
 770         }
 771
 772         rcu_read_unlock();
 773
 774         return active;
 775 }
 776
 777 static void ieee80211_ibss_sta_expire(struct ieee80211_sub_if_data *sdata)
 778 {
 779         struct ieee80211_local *local = sdata->local;
 780         struct sta_info *sta, *tmp;
 781         unsigned long exp_time = IEEE80211_IBSS_INACTIVITY_LIMIT;
 782         unsigned long exp_rsn_time = IEEE80211_IBSS_RSN_INACTIVITY_LIMIT;
 783
 784         mutex_lock(&local->sta_mtx);
 785
 786         list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
 787                 if (sdata != sta->sdata)
 788                         continue;
 789
 790                 if (time_after(jiffies, sta->last_rx + exp_time) ||
 791                     (time_after(jiffies, sta->last_rx + exp_rsn_time) &&
 792                      sta->sta_state != IEEE80211_STA_AUTHORIZED)) {
 793                         sta_dbg(sta->sdata, "expiring inactive %sSTA %pM\n",
 794                                 sta->sta_state != IEEE80211_STA_AUTHORIZED ?
 795                                 "not authorized " : "", sta->sta.addr);
 796
 797                         WARN_ON(__sta_info_destroy(sta));
 798                 }
 799         }
 800
 801         mutex_unlock(&local->sta_mtx);
 802 }
 803
 804 /*
 805  * This function is called with state == IEEE80211_IBSS_MLME_JOINED
 806  */
 807
 808 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
 809 {
 810         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 811         enum nl80211_bss_scan_width scan_width;
 812
 813         sdata_assert_lock(sdata);
 814
 815         mod_timer(&ifibss->timer,
 816                   round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
 817
 818         ieee80211_ibss_sta_expire(sdata);
 819
 820         if (time_before(jiffies, ifibss->last_scan_completed +
 821                        IEEE80211_IBSS_MERGE_INTERVAL))
 822                 return;
 823
 824         if (ieee80211_sta_active_ibss(sdata))
 825                 return;
 826
 827         if (ifibss->fixed_channel)
 828                 return;
 829
 830         sdata_info(sdata,
 831                    "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n");
 832
 833         scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
 834         ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len,
 835                                     NULL, scan_width);
 836 }
 837
 838 static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
 839 {
 840         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 841         u8 bssid[ETH_ALEN];
 842         u16 capability;
 843         int i;
 844
 845         sdata_assert_lock(sdata);
 846
 847         if (ifibss->fixed_bssid) {
 848                 memcpy(bssid, ifibss->bssid, ETH_ALEN);
 849         } else {
 850                 /* Generate random, not broadcast, locally administered BSSID. Mix in
 851                  * own MAC address to make sure that devices that do not have proper
 852                  * random number generator get different BSSID. */
 853                 get_random_bytes(bssid, ETH_ALEN);
 854                 for (i = 0; i < ETH_ALEN; i++)
 855                         bssid[i] ^= sdata->vif.addr[i];
 856                 bssid[0] &= ~0x01;
 857                 bssid[0] |= 0x02;
 858         }
 859
 860         sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid);
 861
 862         capability = WLAN_CAPABILITY_IBSS;
 863
 864         if (ifibss->privacy)
 865                 capability |= WLAN_CAPABILITY_PRIVACY;
 866         else
 867                 sdata->drop_unencrypted = 0;
 868
 869         __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int,
 870                                   ifibss->chandef.chan, ifibss->basic_rates,
 871                                   capability, 0, true);
 872 }
 873
 874 /*
 875  * This function is called with state == IEEE80211_IBSS_MLME_SEARCH
 876  */
 877
 878 static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
 879 {
 880         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 881         struct ieee80211_local *local = sdata->local;
 882         struct cfg80211_bss *cbss;
 883         struct ieee80211_channel *chan = NULL;
 884         const u8 *bssid = NULL;
 885         enum nl80211_bss_scan_width scan_width;
 886         int active_ibss;
 887         u16 capability;
 888
 889         sdata_assert_lock(sdata);
 890
 891         active_ibss = ieee80211_sta_active_ibss(sdata);
 892         ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss);
 893
 894         if (active_ibss)
 895                 return;
 896
 897         capability = WLAN_CAPABILITY_IBSS;
 898         if (ifibss->privacy)
 899                 capability |= WLAN_CAPABILITY_PRIVACY;
 900         if (ifibss->fixed_bssid)
 901                 bssid = ifibss->bssid;
 902         if (ifibss->fixed_channel)
 903                 chan = ifibss->chandef.chan;
 904         if (!is_zero_ether_addr(ifibss->bssid))
 905                 bssid = ifibss->bssid;
 906         cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid,
 907                                 ifibss->ssid, ifibss->ssid_len,
 908                                 WLAN_CAPABILITY_IBSS | WLAN_CAPABILITY_PRIVACY,
 909                                 capability);
 910
 911         if (cbss) {
 912                 struct ieee80211_bss *bss;
 913
 914                 bss = (void *)cbss->priv;
 915                 ibss_dbg(sdata,
 916                          "sta_find_ibss: selected %pM current %pM\n",
 917                          cbss->bssid, ifibss->bssid);
 918                 sdata_info(sdata,
 919                            "Selected IBSS BSSID %pM based on configured SSID\n",
 920                            cbss->bssid);
 921
 922                 ieee80211_sta_join_ibss(sdata, bss);
 923                 ieee80211_rx_bss_put(local, bss);
 924                 return;
 925         }
 926
 927         /* if a fixed bssid and a fixed freq have been provided create the IBSS
 928          * directly and do not waste time scanning
 929          */
 930         if (ifibss->fixed_bssid && ifibss->fixed_channel) {
 931                 sdata_info(sdata, "Created IBSS using preconfigured BSSID %pM\n",
 932                            bssid);
 933                 ieee80211_sta_create_ibss(sdata);
 934                 return;
 935         }
 936
 937
 938         ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n");
 939
 940         /* Selected IBSS not found in current scan results - try to scan */
 941         if (time_after(jiffies, ifibss->last_scan_completed +
 942                                         IEEE80211_SCAN_INTERVAL)) {
 943                 sdata_info(sdata, "Trigger new scan to find an IBSS to join\n");
 944
 945                 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
 946                 ieee80211_request_ibss_scan(sdata, ifibss->ssid,
 947                                             ifibss->ssid_len, chan,
 948                                             scan_width);
 949         } else {
 950                 int interval = IEEE80211_SCAN_INTERVAL;
 951
 952                 if (time_after(jiffies, ifibss->ibss_join_req +
 953                                IEEE80211_IBSS_JOIN_TIMEOUT))
 954                         ieee80211_sta_create_ibss(sdata);
 955
 956                 mod_timer(&ifibss->timer,
 957                           round_jiffies(jiffies + interval));
 958         }
 959 }
 960
 961 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
 962                                         struct sk_buff *req)
 963 {
 964         struct ieee80211_mgmt *mgmt = (void *)req->data;
 965         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 966         struct ieee80211_local *local = sdata->local;
 967         int tx_last_beacon, len = req->len;
 968         struct sk_buff *skb;
 969         struct beacon_data *presp;
 970         u8 *pos, *end;
 971
 972         sdata_assert_lock(sdata);
 973
 974         presp = rcu_dereference_protected(ifibss->presp,
 975                                           lockdep_is_held(&sdata->wdev.mtx));
 976
 977         if (ifibss->state != IEEE80211_IBSS_MLME_JOINED ||
 978             len < 24 + 2 || !presp)
 979                 return;
 980
 981         tx_last_beacon = drv_tx_last_beacon(local);
 982
 983         ibss_dbg(sdata,
 984                  "RX ProbeReq SA=%pM DA=%pM BSSID=%pM (tx_last_beacon=%d)\n",
 985                  mgmt->sa, mgmt->da, mgmt->bssid, tx_last_beacon);
 986
 987         if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da))
 988                 return;
 989
 990         if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) &&
 991             !is_broadcast_ether_addr(mgmt->bssid))
 992                 return;
 993
 994         end = ((u8 *) mgmt) + len;
 995         pos = mgmt->u.probe_req.variable;
 996         if (pos[0] != WLAN_EID_SSID ||
 997             pos + 2 + pos[1] > end) {
 998                 ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n",
 999                          mgmt->sa);
1000                 return;
1001         }
1002         if (pos[1] != 0 &&
1003             (pos[1] != ifibss->ssid_len ||
1004              memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) {
1005                 /* Ignore ProbeReq for foreign SSID */
1006                 return;
1007         }
1008
1009         /* Reply with ProbeResp */
1010         skb = dev_alloc_skb(local->tx_headroom + presp->head_len);
1011         if (!skb)
1012                 return;
1013
1014         skb_reserve(skb, local->tx_headroom);
1015         memcpy(skb_put(skb, presp->head_len), presp->head, presp->head_len);
1016
1017         memcpy(((struct ieee80211_mgmt *) skb->data)->da, mgmt->sa, ETH_ALEN);
1018         ibss_dbg(sdata, "Sending ProbeResp to %pM\n", mgmt->sa);
1019         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1020         ieee80211_tx_skb(sdata, skb);
1021 }
1022
1023 static
1024 void ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data *sdata,
1025                                     struct ieee80211_mgmt *mgmt, size_t len,
1026                                     struct ieee80211_rx_status *rx_status)
1027 {
1028         size_t baselen;
1029         struct ieee802_11_elems elems;
1030
1031         BUILD_BUG_ON(offsetof(typeof(mgmt->u.probe_resp), variable) !=
1032                      offsetof(typeof(mgmt->u.beacon), variable));
1033
1034         /*
1035          * either beacon or probe_resp but the variable field is at the
1036          * same offset
1037          */
1038         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1039         if (baselen > len)
1040                 return;
1041
1042         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1043                                false, &elems);
1044
1045         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
1046 }
1047
1048 void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1049                                    struct sk_buff *skb)
1050 {
1051         struct ieee80211_rx_status *rx_status;
1052         struct ieee80211_mgmt *mgmt;
1053         u16 fc;
1054
1055         rx_status = IEEE80211_SKB_RXCB(skb);
1056         mgmt = (struct ieee80211_mgmt *) skb->data;
1057         fc = le16_to_cpu(mgmt->frame_control);
1058
1059         sdata_lock(sdata);
1060
1061         if (!sdata->u.ibss.ssid_len)
1062                 goto mgmt_out; /* not ready to merge yet */
1063
1064         switch (fc & IEEE80211_FCTL_STYPE) {
1065         case IEEE80211_STYPE_PROBE_REQ:
1066                 ieee80211_rx_mgmt_probe_req(sdata, skb);
1067                 break;
1068         case IEEE80211_STYPE_PROBE_RESP:
1069         case IEEE80211_STYPE_BEACON:
1070                 ieee80211_rx_mgmt_probe_beacon(sdata, mgmt, skb->len,
1071                                                rx_status);
1072                 break;
1073         case IEEE80211_STYPE_AUTH:
1074                 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len);
1075                 break;
1076         case IEEE80211_STYPE_DEAUTH:
1077                 ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len);
1078                 break;
1079         }
1080
1081  mgmt_out:
1082         sdata_unlock(sdata);
1083 }
1084
1085 void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata)
1086 {
1087         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1088         struct sta_info *sta;
1089
1090         sdata_lock(sdata);
1091
1092         /*
1093          * Work could be scheduled after scan or similar
1094          * when we aren't even joined (or trying) with a
1095          * network.
1096          */
1097         if (!ifibss->ssid_len)
1098                 goto out;
1099
1100         spin_lock_bh(&ifibss->incomplete_lock);
1101         while (!list_empty(&ifibss->incomplete_stations)) {
1102                 sta = list_first_entry(&ifibss->incomplete_stations,
1103                                        struct sta_info, list);
1104                 list_del(&sta->list);
1105                 spin_unlock_bh(&ifibss->incomplete_lock);
1106
1107                 ieee80211_ibss_finish_sta(sta);
1108                 rcu_read_unlock();
1109                 spin_lock_bh(&ifibss->incomplete_lock);
1110         }
1111         spin_unlock_bh(&ifibss->incomplete_lock);
1112
1113         switch (ifibss->state) {
1114         case IEEE80211_IBSS_MLME_SEARCH:
1115                 ieee80211_sta_find_ibss(sdata);
1116                 break;
1117         case IEEE80211_IBSS_MLME_JOINED:
1118                 ieee80211_sta_merge_ibss(sdata);
1119                 break;
1120         default:
1121                 WARN_ON(1);
1122                 break;
1123         }
1124
1125  out:
1126         sdata_unlock(sdata);
1127 }
1128
1129 static void ieee80211_ibss_timer(unsigned long data)
1130 {
1131         struct ieee80211_sub_if_data *sdata =
1132                 (struct ieee80211_sub_if_data *) data;
1133
1134         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1135 }
1136
1137 void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata)
1138 {
1139         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1140
1141         setup_timer(&ifibss->timer, ieee80211_ibss_timer,
1142                     (unsigned long) sdata);
1143         INIT_LIST_HEAD(&ifibss->incomplete_stations);
1144         spin_lock_init(&ifibss->incomplete_lock);
1145 }
1146
1147 /* scan finished notification */
1148 void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local)
1149 {
1150         struct ieee80211_sub_if_data *sdata;
1151
1152         mutex_lock(&local->iflist_mtx);
1153         list_for_each_entry(sdata, &local->interfaces, list) {
1154                 if (!ieee80211_sdata_running(sdata))
1155                         continue;
1156                 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
1157                         continue;
1158                 sdata->u.ibss.last_scan_completed = jiffies;
1159                 ieee80211_queue_work(&local->hw, &sdata->work);
1160         }
1161         mutex_unlock(&local->iflist_mtx);
1162 }
1163
1164 int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
1165                         struct cfg80211_ibss_params *params)
1166 {
1167         u32 changed = 0;
1168         u32 rate_flags;
1169         struct ieee80211_supported_band *sband;
1170         int i;
1171
1172         if (params->bssid) {
1173                 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN);
1174                 sdata->u.ibss.fixed_bssid = true;
1175         } else
1176                 sdata->u.ibss.fixed_bssid = false;
1177
1178         sdata->u.ibss.privacy = params->privacy;
1179         sdata->u.ibss.control_port = params->control_port;
1180         sdata->u.ibss.basic_rates = params->basic_rates;
1181
1182         /* fix basic_rates if channel does not support these rates */
1183         rate_flags = ieee80211_chandef_rate_flags(&params->chandef);
1184         sband = sdata->local->hw.wiphy->bands[params->chandef.chan->band];
1185         for (i = 0; i < sband->n_bitrates; i++) {
1186                 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
1187                         sdata->u.ibss.basic_rates &= ~BIT(i);
1188         }
1189         memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate,
1190                sizeof(params->mcast_rate));
1191
1192         sdata->vif.bss_conf.beacon_int = params->beacon_interval;
1193
1194         sdata->u.ibss.chandef = params->chandef;
1195         sdata->u.ibss.fixed_channel = params->channel_fixed;
1196
1197         if (params->ie) {
1198                 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len,
1199                                            GFP_KERNEL);
1200                 if (sdata->u.ibss.ie)
1201                         sdata->u.ibss.ie_len = params->ie_len;
1202         }
1203
1204         sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
1205         sdata->u.ibss.ibss_join_req = jiffies;
1206
1207         memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len);
1208         sdata->u.ibss.ssid_len = params->ssid_len;
1209
1210         memcpy(&sdata->u.ibss.ht_capa, &params->ht_capa,
1211                sizeof(sdata->u.ibss.ht_capa));
1212         memcpy(&sdata->u.ibss.ht_capa_mask, &params->ht_capa_mask,
1213                sizeof(sdata->u.ibss.ht_capa_mask));
1214
1215         /*
1216          * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is
1217          * reserved, but an HT STA shall protect HT transmissions as though
1218          * the HT Protection field were set to non-HT mixed mode.
1219          *
1220          * In an IBSS, the RIFS Mode field of the HT Operation element is
1221          * also reserved, but an HT STA shall operate as though this field
1222          * were set to 1.
1223          */
1224
1225         sdata->vif.bss_conf.ht_operation_mode |=
1226                   IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED
1227                 | IEEE80211_HT_PARAM_RIFS_MODE;
1228
1229         changed |= BSS_CHANGED_HT;
1230         ieee80211_bss_info_change_notify(sdata, changed);
1231
1232         sdata->smps_mode = IEEE80211_SMPS_OFF;
1233         sdata->needed_rx_chains = sdata->local->rx_chains;
1234
1235         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1236
1237         return 0;
1238 }
1239
1240 int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata)
1241 {
1242         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1243         struct ieee80211_local *local = sdata->local;
1244         struct cfg80211_bss *cbss;
1245         u16 capability;
1246         int active_ibss;
1247         struct sta_info *sta;
1248         struct beacon_data *presp;
1249
1250         active_ibss = ieee80211_sta_active_ibss(sdata);
1251
1252         if (!active_ibss && !is_zero_ether_addr(ifibss->bssid)) {
1253                 capability = WLAN_CAPABILITY_IBSS;
1254
1255                 if (ifibss->privacy)
1256                         capability |= WLAN_CAPABILITY_PRIVACY;
1257
1258                 cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->chandef.chan,
1259                                         ifibss->bssid, ifibss->ssid,
1260                                         ifibss->ssid_len, WLAN_CAPABILITY_IBSS |
1261                                         WLAN_CAPABILITY_PRIVACY,
1262                                         capability);
1263
1264                 if (cbss) {
1265                         cfg80211_unlink_bss(local->hw.wiphy, cbss);
1266                         cfg80211_put_bss(local->hw.wiphy, cbss);
1267                 }
1268         }
1269
1270         ifibss->state = IEEE80211_IBSS_MLME_SEARCH;
1271         memset(ifibss->bssid, 0, ETH_ALEN);
1272         ifibss->ssid_len = 0;
1273
1274         sta_info_flush(sdata);
1275
1276         spin_lock_bh(&ifibss->incomplete_lock);
1277         while (!list_empty(&ifibss->incomplete_stations)) {
1278                 sta = list_first_entry(&ifibss->incomplete_stations,
1279                                        struct sta_info, list);
1280                 list_del(&sta->list);
1281                 spin_unlock_bh(&ifibss->incomplete_lock);
1282
1283                 sta_info_free(local, sta);
1284                 spin_lock_bh(&ifibss->incomplete_lock);
1285         }
1286         spin_unlock_bh(&ifibss->incomplete_lock);
1287
1288         netif_carrier_off(sdata->dev);
1289
1290         /* remove beacon */
1291         kfree(sdata->u.ibss.ie);
1292         presp = rcu_dereference_protected(ifibss->presp,
1293                                           lockdep_is_held(&sdata->wdev.mtx));
1294         RCU_INIT_POINTER(sdata->u.ibss.presp, NULL);
1295
1296         /* on the next join, re-program HT parameters */
1297         memset(&ifibss->ht_capa, 0, sizeof(ifibss->ht_capa));
1298         memset(&ifibss->ht_capa_mask, 0, sizeof(ifibss->ht_capa_mask));
1299
1300         sdata->vif.bss_conf.ibss_joined = false;
1301         sdata->vif.bss_conf.ibss_creator = false;
1302         sdata->vif.bss_conf.enable_beacon = false;
1303         sdata->vif.bss_conf.ssid_len = 0;
1304         clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state);
1305         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED |
1306                                                 BSS_CHANGED_IBSS);
1307         synchronize_rcu();
1308         kfree(presp);
1309
1310         skb_queue_purge(&sdata->skb_queue);
1311
1312         del_timer_sync(&sdata->u.ibss.timer);
1313
1314         return 0;
1315 }