net/mac80211/ibss.c

   1 /*
   2  * IBSS mode implementation
   3  * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
   4  * Copyright 2004, Instant802 Networks, Inc.
   5  * Copyright 2005, Devicescape Software, Inc.
   6  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   7  * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
   8  * Copyright 2009, Johannes Berg <johannes@sipsolutions.net>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2 as
  12  * published by the Free Software Foundation.
  13  */
  14
  15 #include <linux/delay.h>
  16 #include <linux/slab.h>
  17 #include <linux/if_ether.h>
  18 #include <linux/skbuff.h>
  19 #include <linux/if_arp.h>
  20 #include <linux/etherdevice.h>
  21 #include <linux/rtnetlink.h>
  22 #include <net/mac80211.h>
  23
  24 #include "ieee80211_i.h"
  25 #include "driver-ops.h"
  26 #include "rate.h"
  27
  28 #define IEEE80211_SCAN_INTERVAL (2 * HZ)
  29 #define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ)
  30
  31 #define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ)
  32 #define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ)
  33 #define IEEE80211_IBSS_RSN_INACTIVITY_LIMIT (10 * 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                                       bool creator)
  44 {
  45         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
  46         struct ieee80211_local *local = sdata->local;
  47         int rates_n = 0, i, ri;
  48         struct ieee80211_mgmt *mgmt;
  49         u8 *pos;
  50         struct ieee80211_supported_band *sband;
  51         struct cfg80211_bss *bss;
  52         u32 bss_change, rate_flags, rates = 0, rates_added = 0;
  53         struct cfg80211_chan_def chandef;
  54         enum nl80211_bss_scan_width scan_width;
  55         bool have_higher_than_11mbit = false;
  56         struct beacon_data *presp;
  57         int frame_len;
  58         int shift;
  59
  60         sdata_assert_lock(sdata);
  61
  62         /* Reset own TSF to allow time synchronization work. */
  63         drv_reset_tsf(local, sdata);
  64
  65         if (!ether_addr_equal(ifibss->bssid, bssid))
  66                 sta_info_flush(sdata);
  67
  68         /* if merging, indicate to driver that we leave the old IBSS */
  69         if (sdata->vif.bss_conf.ibss_joined) {
  70                 sdata->vif.bss_conf.ibss_joined = false;
  71                 sdata->vif.bss_conf.ibss_creator = false;
  72                 sdata->vif.bss_conf.enable_beacon = false;
  73                 netif_carrier_off(sdata->dev);
  74                 ieee80211_bss_info_change_notify(sdata,
  75                                                  BSS_CHANGED_IBSS |
  76                                                  BSS_CHANGED_BEACON_ENABLED);
  77         }
  78
  79         presp = rcu_dereference_protected(ifibss->presp,
  80                                           lockdep_is_held(&sdata->wdev.mtx));
  81         rcu_assign_pointer(ifibss->presp, NULL);
  82         if (presp)
  83                 kfree_rcu(presp, rcu_head);
  84
  85         sdata->drop_unencrypted = capability & WLAN_CAPABILITY_PRIVACY ? 1 : 0;
  86
  87         chandef = ifibss->chandef;
  88         if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef)) {
  89                 if (chandef.width == NL80211_CHAN_WIDTH_5 ||
  90                     chandef.width == NL80211_CHAN_WIDTH_10 ||
  91                     chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
  92                     chandef.width == NL80211_CHAN_WIDTH_20) {
  93                         sdata_info(sdata,
  94                                    "Failed to join IBSS, beacons forbidden\n");
  95                         return;
  96                 }
  97                 chandef.width = NL80211_CHAN_WIDTH_20;
  98                 chandef.center_freq1 = chan->center_freq;
  99         }
 100
 101         ieee80211_vif_release_channel(sdata);
 102         if (ieee80211_vif_use_channel(sdata, &chandef,
 103                                       ifibss->fixed_channel ?
 104                                         IEEE80211_CHANCTX_SHARED :
 105                                         IEEE80211_CHANCTX_EXCLUSIVE)) {
 106                 sdata_info(sdata, "Failed to join IBSS, no channel context\n");
 107                 return;
 108         }
 109
 110         memcpy(ifibss->bssid, bssid, ETH_ALEN);
 111
 112         sband = local->hw.wiphy->bands[chan->band];
 113         shift = ieee80211_vif_get_shift(&sdata->vif);
 114
 115         /* Build IBSS probe response */
 116         frame_len = sizeof(struct ieee80211_hdr_3addr) +
 117                     12 /* struct ieee80211_mgmt.u.beacon */ +
 118                     2 + IEEE80211_MAX_SSID_LEN /* max SSID */ +
 119                     2 + 8 /* max Supported Rates */ +
 120                     3 /* max DS params */ +
 121                     4 /* IBSS params */ +
 122                     2 + (IEEE80211_MAX_SUPP_RATES - 8) +
 123                     2 + sizeof(struct ieee80211_ht_cap) +
 124                     2 + sizeof(struct ieee80211_ht_operation) +
 125                     ifibss->ie_len;
 126         presp = kzalloc(sizeof(*presp) + frame_len, GFP_KERNEL);
 127         if (!presp)
 128                 return;
 129
 130         presp->head = (void *)(presp + 1);
 131
 132         mgmt = (void *) presp->head;
 133         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 134                                           IEEE80211_STYPE_PROBE_RESP);
 135         eth_broadcast_addr(mgmt->da);
 136         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 137         memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN);
 138         mgmt->u.beacon.beacon_int = cpu_to_le16(beacon_int);
 139         mgmt->u.beacon.timestamp = cpu_to_le64(tsf);
 140         mgmt->u.beacon.capab_info = cpu_to_le16(capability);
 141
 142         pos = (u8 *)mgmt + offsetof(struct ieee80211_mgmt, u.beacon.variable);
 143
 144         *pos++ = WLAN_EID_SSID;
 145         *pos++ = ifibss->ssid_len;
 146         memcpy(pos, ifibss->ssid, ifibss->ssid_len);
 147         pos += ifibss->ssid_len;
 148
 149         rate_flags = ieee80211_chandef_rate_flags(&chandef);
 150         for (i = 0; i < sband->n_bitrates; i++) {
 151                 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
 152                         continue;
 153                 if (sband->bitrates[i].bitrate > 110)
 154                         have_higher_than_11mbit = true;
 155
 156                 rates |= BIT(i);
 157                 rates_n++;
 158         }
 159
 160         *pos++ = WLAN_EID_SUPP_RATES;
 161         *pos++ = min_t(int, 8, rates_n);
 162         for (ri = 0; ri < sband->n_bitrates; ri++) {
 163                 int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate,
 164                                         5 * (1 << shift));
 165                 u8 basic = 0;
 166                 if (!(rates & BIT(ri)))
 167                         continue;
 168
 169                 if (basic_rates & BIT(ri))
 170                         basic = 0x80;
 171                 *pos++ = basic | (u8) rate;
 172                 if (++rates_added == 8) {
 173                         ri++; /* continue at next rate for EXT_SUPP_RATES */
 174                         break;
 175                 }
 176         }
 177
 178         if (sband->band == IEEE80211_BAND_2GHZ) {
 179                 *pos++ = WLAN_EID_DS_PARAMS;
 180                 *pos++ = 1;
 181                 *pos++ = ieee80211_frequency_to_channel(chan->center_freq);
 182         }
 183
 184         *pos++ = WLAN_EID_IBSS_PARAMS;
 185         *pos++ = 2;
 186         /* FIX: set ATIM window based on scan results */
 187         *pos++ = 0;
 188         *pos++ = 0;
 189
 190         /* put the remaining rates in WLAN_EID_EXT_SUPP_RATES */
 191         if (rates_n > 8) {
 192                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 193                 *pos++ = rates_n - 8;
 194                 for (; ri < sband->n_bitrates; ri++) {
 195                         int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate,
 196                                                 5 * (1 << shift));
 197                         u8 basic = 0;
 198                         if (!(rates & BIT(ri)))
 199                                 continue;
 200
 201                         if (basic_rates & BIT(ri))
 202                                 basic = 0x80;
 203                         *pos++ = basic | (u8) rate;
 204                 }
 205         }
 206
 207         if (ifibss->ie_len) {
 208                 memcpy(pos, ifibss->ie, ifibss->ie_len);
 209                 pos += ifibss->ie_len;
 210         }
 211
 212         /* add HT capability and information IEs */
 213         if (chandef.width != NL80211_CHAN_WIDTH_20_NOHT &&
 214             chandef.width != NL80211_CHAN_WIDTH_5 &&
 215             chandef.width != NL80211_CHAN_WIDTH_10 &&
 216             sband->ht_cap.ht_supported) {
 217                 struct ieee80211_sta_ht_cap ht_cap;
 218
 219                 memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
 220                 ieee80211_apply_htcap_overrides(sdata, &ht_cap);
 221
 222                 pos = ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap);
 223                 /*
 224                  * Note: According to 802.11n-2009 9.13.3.1, HT Protection
 225                  * field and RIFS Mode are reserved in IBSS mode, therefore
 226                  * keep them at 0
 227                  */
 228                 pos = ieee80211_ie_build_ht_oper(pos, &sband->ht_cap,
 229                                                  &chandef, 0);
 230         }
 231
 232         if (local->hw.queues >= IEEE80211_NUM_ACS) {
 233                 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
 234                 *pos++ = 7; /* len */
 235                 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
 236                 *pos++ = 0x50;
 237                 *pos++ = 0xf2;
 238                 *pos++ = 2; /* WME */
 239                 *pos++ = 0; /* WME info */
 240                 *pos++ = 1; /* WME ver */
 241                 *pos++ = 0; /* U-APSD no in use */
 242         }
 243
 244         presp->head_len = pos - presp->head;
 245         if (WARN_ON(presp->head_len > frame_len))
 246                 return;
 247
 248         rcu_assign_pointer(ifibss->presp, presp);
 249
 250         sdata->vif.bss_conf.enable_beacon = true;
 251         sdata->vif.bss_conf.beacon_int = beacon_int;
 252         sdata->vif.bss_conf.basic_rates = basic_rates;
 253         sdata->vif.bss_conf.ssid_len = ifibss->ssid_len;
 254         memcpy(sdata->vif.bss_conf.ssid, ifibss->ssid, ifibss->ssid_len);
 255         bss_change = BSS_CHANGED_BEACON_INT;
 256         bss_change |= ieee80211_reset_erp_info(sdata);
 257         bss_change |= BSS_CHANGED_BSSID;
 258         bss_change |= BSS_CHANGED_BEACON;
 259         bss_change |= BSS_CHANGED_BEACON_ENABLED;
 260         bss_change |= BSS_CHANGED_BASIC_RATES;
 261         bss_change |= BSS_CHANGED_HT;
 262         bss_change |= BSS_CHANGED_IBSS;
 263         bss_change |= BSS_CHANGED_SSID;
 264
 265         /*
 266          * In 5 GHz/802.11a, we can always use short slot time.
 267          * (IEEE 802.11-2012 18.3.8.7)
 268          *
 269          * In 2.4GHz, we must always use long slots in IBSS for compatibility
 270          * reasons.
 271          * (IEEE 802.11-2012 19.4.5)
 272          *
 273          * HT follows these specifications (IEEE 802.11-2012 20.3.18)
 274          */
 275         sdata->vif.bss_conf.use_short_slot = chan->band == IEEE80211_BAND_5GHZ;
 276         bss_change |= BSS_CHANGED_ERP_SLOT;
 277
 278         /* cf. IEEE 802.11 9.2.12 */
 279         if (chan->band == IEEE80211_BAND_2GHZ && have_higher_than_11mbit)
 280                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
 281         else
 282                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
 283
 284         sdata->vif.bss_conf.ibss_joined = true;
 285         sdata->vif.bss_conf.ibss_creator = creator;
 286         ieee80211_bss_info_change_notify(sdata, bss_change);
 287
 288         ieee80211_set_wmm_default(sdata, true);
 289
 290         ifibss->state = IEEE80211_IBSS_MLME_JOINED;
 291         mod_timer(&ifibss->timer,
 292                   round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
 293
 294         scan_width = cfg80211_chandef_to_scan_width(&chandef);
 295         bss = cfg80211_inform_bss_width_frame(local->hw.wiphy, chan,
 296                                               scan_width, mgmt,
 297                                               presp->head_len, 0, GFP_KERNEL);
 298         cfg80211_put_bss(local->hw.wiphy, bss);
 299         netif_carrier_on(sdata->dev);
 300         cfg80211_ibss_joined(sdata->dev, ifibss->bssid, GFP_KERNEL);
 301 }
 302
 303 static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
 304                                     struct ieee80211_bss *bss)
 305 {
 306         struct cfg80211_bss *cbss =
 307                 container_of((void *)bss, struct cfg80211_bss, priv);
 308         struct ieee80211_supported_band *sband;
 309         u32 basic_rates;
 310         int i, j;
 311         u16 beacon_int = cbss->beacon_interval;
 312         const struct cfg80211_bss_ies *ies;
 313         u64 tsf;
 314         u32 rate_flags;
 315         int shift;
 316
 317         sdata_assert_lock(sdata);
 318
 319         if (beacon_int < 10)
 320                 beacon_int = 10;
 321
 322         sband = sdata->local->hw.wiphy->bands[cbss->channel->band];
 323         rate_flags = ieee80211_chandef_rate_flags(&sdata->u.ibss.chandef);
 324         shift = ieee80211_vif_get_shift(&sdata->vif);
 325
 326         basic_rates = 0;
 327
 328         for (i = 0; i < bss->supp_rates_len; i++) {
 329                 int rate = bss->supp_rates[i] & 0x7f;
 330                 bool is_basic = !!(bss->supp_rates[i] & 0x80);
 331
 332                 for (j = 0; j < sband->n_bitrates; j++) {
 333                         int brate;
 334                         if ((rate_flags & sband->bitrates[j].flags)
 335                             != rate_flags)
 336                                 continue;
 337
 338                         brate = DIV_ROUND_UP(sband->bitrates[j].bitrate,
 339                                              5 * (1 << shift));
 340                         if (brate == rate) {
 341                                 if (is_basic)
 342                                         basic_rates |= BIT(j);
 343                                 break;
 344                         }
 345                 }
 346         }
 347
 348         rcu_read_lock();
 349         ies = rcu_dereference(cbss->ies);
 350         tsf = ies->tsf;
 351         rcu_read_unlock();
 352
 353         __ieee80211_sta_join_ibss(sdata, cbss->bssid,
 354                                   beacon_int,
 355                                   cbss->channel,
 356                                   basic_rates,
 357                                   cbss->capability,
 358                                   tsf, false);
 359 }
 360
 361 static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta)
 362         __acquires(RCU)
 363 {
 364         struct ieee80211_sub_if_data *sdata = sta->sdata;
 365         u8 addr[ETH_ALEN];
 366
 367         memcpy(addr, sta->sta.addr, ETH_ALEN);
 368
 369         ibss_dbg(sdata, "Adding new IBSS station %pM\n", addr);
 370
 371         sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
 372         sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
 373         /* authorize the station only if the network is not RSN protected. If
 374          * not wait for the userspace to authorize it */
 375         if (!sta->sdata->u.ibss.control_port)
 376                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
 377
 378         rate_control_rate_init(sta);
 379
 380         /* If it fails, maybe we raced another insertion? */
 381         if (sta_info_insert_rcu(sta))
 382                 return sta_info_get(sdata, addr);
 383         return sta;
 384 }
 385
 386 static struct sta_info *
 387 ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, const u8 *bssid,
 388                        const u8 *addr, u32 supp_rates)
 389         __acquires(RCU)
 390 {
 391         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 392         struct ieee80211_local *local = sdata->local;
 393         struct sta_info *sta;
 394         struct ieee80211_chanctx_conf *chanctx_conf;
 395         struct ieee80211_supported_band *sband;
 396         enum nl80211_bss_scan_width scan_width;
 397         int band;
 398
 399         /*
 400          * XXX: Consider removing the least recently used entry and
 401          *      allow new one to be added.
 402          */
 403         if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
 404                 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
 405                                     sdata->name, addr);
 406                 rcu_read_lock();
 407                 return NULL;
 408         }
 409
 410         if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) {
 411                 rcu_read_lock();
 412                 return NULL;
 413         }
 414
 415         if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) {
 416                 rcu_read_lock();
 417                 return NULL;
 418         }
 419
 420         rcu_read_lock();
 421         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 422         if (WARN_ON_ONCE(!chanctx_conf))
 423                 return NULL;
 424         band = chanctx_conf->def.chan->band;
 425         scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
 426         rcu_read_unlock();
 427
 428         sta = sta_info_alloc(sdata, addr, GFP_KERNEL);
 429         if (!sta) {
 430                 rcu_read_lock();
 431                 return NULL;
 432         }
 433
 434         sta->last_rx = jiffies;
 435
 436         /* make sure mandatory rates are always added */
 437         sband = local->hw.wiphy->bands[band];
 438         sta->sta.supp_rates[band] = supp_rates |
 439                         ieee80211_mandatory_rates(sband, scan_width);
 440
 441         return ieee80211_ibss_finish_sta(sta);
 442 }
 443
 444 static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data *sdata,
 445                                           struct ieee80211_mgmt *mgmt,
 446                                           size_t len)
 447 {
 448         u16 reason = le16_to_cpu(mgmt->u.deauth.reason_code);
 449
 450         if (len < IEEE80211_DEAUTH_FRAME_LEN)
 451                 return;
 452
 453         ibss_dbg(sdata, "RX DeAuth SA=%pM DA=%pM BSSID=%pM (reason: %d)\n",
 454                  mgmt->sa, mgmt->da, mgmt->bssid, reason);
 455         sta_info_destroy_addr(sdata, mgmt->sa);
 456 }
 457
 458 static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata,
 459                                         struct ieee80211_mgmt *mgmt,
 460                                         size_t len)
 461 {
 462         u16 auth_alg, auth_transaction;
 463
 464         sdata_assert_lock(sdata);
 465
 466         if (len < 24 + 6)
 467                 return;
 468
 469         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
 470         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
 471
 472         ibss_dbg(sdata,
 473                  "RX Auth SA=%pM DA=%pM BSSID=%pM (auth_transaction=%d)\n",
 474                  mgmt->sa, mgmt->da, mgmt->bssid, auth_transaction);
 475
 476         if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
 477                 return;
 478
 479         /*
 480          * IEEE 802.11 standard does not require authentication in IBSS
 481          * networks and most implementations do not seem to use it.
 482          * However, try to reply to authentication attempts if someone
 483          * has actually implemented this.
 484          */
 485         ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, 0, NULL, 0,
 486                             mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0, 0);
 487 }
 488
 489 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
 490                                   struct ieee80211_mgmt *mgmt, size_t len,
 491                                   struct ieee80211_rx_status *rx_status,
 492                                   struct ieee802_11_elems *elems)
 493 {
 494         struct ieee80211_local *local = sdata->local;
 495         int freq;
 496         struct cfg80211_bss *cbss;
 497         struct ieee80211_bss *bss;
 498         struct sta_info *sta;
 499         struct ieee80211_channel *channel;
 500         u64 beacon_timestamp, rx_timestamp;
 501         u32 supp_rates = 0;
 502         enum ieee80211_band band = rx_status->band;
 503         enum nl80211_bss_scan_width scan_width;
 504         struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band];
 505         bool rates_updated = false;
 506
 507         if (elems->ds_params)
 508                 freq = ieee80211_channel_to_frequency(elems->ds_params[0],
 509                                                       band);
 510         else
 511                 freq = rx_status->freq;
 512
 513         channel = ieee80211_get_channel(local->hw.wiphy, freq);
 514
 515         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
 516                 return;
 517
 518         if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
 519             ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid)) {
 520
 521                 rcu_read_lock();
 522                 sta = sta_info_get(sdata, mgmt->sa);
 523
 524                 if (elems->supp_rates) {
 525                         supp_rates = ieee80211_sta_get_rates(sdata, elems,
 526                                                              band, NULL);
 527                         if (sta) {
 528                                 u32 prev_rates;
 529
 530                                 prev_rates = sta->sta.supp_rates[band];
 531                                 /* make sure mandatory rates are always added */
 532                                 scan_width = NL80211_BSS_CHAN_WIDTH_20;
 533                                 if (rx_status->flag & RX_FLAG_5MHZ)
 534                                         scan_width = NL80211_BSS_CHAN_WIDTH_5;
 535                                 if (rx_status->flag & RX_FLAG_10MHZ)
 536                                         scan_width = NL80211_BSS_CHAN_WIDTH_10;
 537
 538                                 sta->sta.supp_rates[band] = supp_rates |
 539                                         ieee80211_mandatory_rates(sband,
 540                                                                   scan_width);
 541                                 if (sta->sta.supp_rates[band] != prev_rates) {
 542                                         ibss_dbg(sdata,
 543                                                  "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n",
 544                                                  sta->sta.addr, prev_rates,
 545                                                  sta->sta.supp_rates[band]);
 546                                         rates_updated = true;
 547                                 }
 548                         } else {
 549                                 rcu_read_unlock();
 550                                 sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid,
 551                                                 mgmt->sa, supp_rates);
 552                         }
 553                 }
 554
 555                 if (sta && elems->wmm_info)
 556                         set_sta_flag(sta, WLAN_STA_WME);
 557
 558                 if (sta && elems->ht_operation && elems->ht_cap_elem &&
 559                     sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20_NOHT &&
 560                     sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_5 &&
 561                     sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_10) {
 562                         /* we both use HT */
 563                         struct ieee80211_ht_cap htcap_ie;
 564                         struct cfg80211_chan_def chandef;
 565
 566                         ieee80211_ht_oper_to_chandef(channel,
 567                                                      elems->ht_operation,
 568                                                      &chandef);
 569
 570                         memcpy(&htcap_ie, elems->ht_cap_elem, sizeof(htcap_ie));
 571
 572                         /*
 573                          * fall back to HT20 if we don't use or use
 574                          * the other extension channel
 575                          */
 576                         if (chandef.center_freq1 !=
 577                             sdata->u.ibss.chandef.center_freq1)
 578                                 htcap_ie.cap_info &=
 579                                         cpu_to_le16(~IEEE80211_HT_CAP_SUP_WIDTH_20_40);
 580
 581                         rates_updated |= ieee80211_ht_cap_ie_to_sta_ht_cap(
 582                                                 sdata, sband, &htcap_ie, sta);
 583                 }
 584
 585                 if (sta && rates_updated) {
 586                         drv_sta_rc_update(local, sdata, &sta->sta,
 587                                           IEEE80211_RC_SUPP_RATES_CHANGED);
 588                         rate_control_rate_init(sta);
 589                 }
 590
 591                 rcu_read_unlock();
 592         }
 593
 594         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
 595                                         channel);
 596         if (!bss)
 597                 return;
 598
 599         cbss = container_of((void *)bss, struct cfg80211_bss, priv);
 600
 601         /* same for beacon and probe response */
 602         beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp);
 603
 604         /* check if we need to merge IBSS */
 605
 606         /* we use a fixed BSSID */
 607         if (sdata->u.ibss.fixed_bssid)
 608                 goto put_bss;
 609
 610         /* not an IBSS */
 611         if (!(cbss->capability & WLAN_CAPABILITY_IBSS))
 612                 goto put_bss;
 613
 614         /* different channel */
 615         if (sdata->u.ibss.fixed_channel &&
 616             sdata->u.ibss.chandef.chan != cbss->channel)
 617                 goto put_bss;
 618
 619         /* different SSID */
 620         if (elems->ssid_len != sdata->u.ibss.ssid_len ||
 621             memcmp(elems->ssid, sdata->u.ibss.ssid,
 622                                 sdata->u.ibss.ssid_len))
 623                 goto put_bss;
 624
 625         /* same BSSID */
 626         if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid))
 627                 goto put_bss;
 628
 629         if (ieee80211_have_rx_timestamp(rx_status)) {
 630                 /* time when timestamp field was received */
 631                 rx_timestamp =
 632                         ieee80211_calculate_rx_timestamp(local, rx_status,
 633                                                          len + FCS_LEN, 24);
 634         } else {
 635                 /*
 636                  * second best option: get current TSF
 637                  * (will return -1 if not supported)
 638                  */
 639                 rx_timestamp = drv_get_tsf(local, sdata);
 640         }
 641
 642         ibss_dbg(sdata,
 643                  "RX beacon SA=%pM BSSID=%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
 644                  mgmt->sa, mgmt->bssid,
 645                  (unsigned long long)rx_timestamp,
 646                  (unsigned long long)beacon_timestamp,
 647                  (unsigned long long)(rx_timestamp - beacon_timestamp),
 648                  jiffies);
 649
 650         if (beacon_timestamp > rx_timestamp) {
 651                 ibss_dbg(sdata,
 652                          "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n",
 653                          mgmt->bssid);
 654                 ieee80211_sta_join_ibss(sdata, bss);
 655                 supp_rates = ieee80211_sta_get_rates(sdata, elems, band, NULL);
 656                 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa,
 657                                        supp_rates);
 658                 rcu_read_unlock();
 659         }
 660
 661  put_bss:
 662         ieee80211_rx_bss_put(local, bss);
 663 }
 664
 665 void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata,
 666                               const u8 *bssid, const u8 *addr,
 667                               u32 supp_rates)
 668 {
 669         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 670         struct ieee80211_local *local = sdata->local;
 671         struct sta_info *sta;
 672         struct ieee80211_chanctx_conf *chanctx_conf;
 673         struct ieee80211_supported_band *sband;
 674         enum nl80211_bss_scan_width scan_width;
 675         int band;
 676
 677         /*
 678          * XXX: Consider removing the least recently used entry and
 679          *      allow new one to be added.
 680          */
 681         if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
 682                 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
 683                                     sdata->name, addr);
 684                 return;
 685         }
 686
 687         if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH)
 688                 return;
 689
 690         if (!ether_addr_equal(bssid, sdata->u.ibss.bssid))
 691                 return;
 692
 693         rcu_read_lock();
 694         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 695         if (WARN_ON_ONCE(!chanctx_conf)) {
 696                 rcu_read_unlock();
 697                 return;
 698         }
 699         band = chanctx_conf->def.chan->band;
 700         scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
 701         rcu_read_unlock();
 702
 703         sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
 704         if (!sta)
 705                 return;
 706
 707         sta->last_rx = jiffies;
 708
 709         /* make sure mandatory rates are always added */
 710         sband = local->hw.wiphy->bands[band];
 711         sta->sta.supp_rates[band] = supp_rates |
 712                         ieee80211_mandatory_rates(sband, scan_width);
 713
 714         spin_lock(&ifibss->incomplete_lock);
 715         list_add(&sta->list, &ifibss->incomplete_stations);
 716         spin_unlock(&ifibss->incomplete_lock);
 717         ieee80211_queue_work(&local->hw, &sdata->work);
 718 }
 719
 720 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
 721 {
 722         struct ieee80211_local *local = sdata->local;
 723         int active = 0;
 724         struct sta_info *sta;
 725
 726         sdata_assert_lock(sdata);
 727
 728         rcu_read_lock();
 729
 730         list_for_each_entry_rcu(sta, &local->sta_list, list) {
 731                 if (sta->sdata == sdata &&
 732                     time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
 733                                jiffies)) {
 734                         active++;
 735                         break;
 736                 }
 737         }
 738
 739         rcu_read_unlock();
 740
 741         return active;
 742 }
 743
 744 static void ieee80211_ibss_sta_expire(struct ieee80211_sub_if_data *sdata)
 745 {
 746         struct ieee80211_local *local = sdata->local;
 747         struct sta_info *sta, *tmp;
 748         unsigned long exp_time = IEEE80211_IBSS_INACTIVITY_LIMIT;
 749         unsigned long exp_rsn_time = IEEE80211_IBSS_RSN_INACTIVITY_LIMIT;
 750
 751         mutex_lock(&local->sta_mtx);
 752
 753         list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
 754                 if (sdata != sta->sdata)
 755                         continue;
 756
 757                 if (time_after(jiffies, sta->last_rx + exp_time) ||
 758                     (time_after(jiffies, sta->last_rx + exp_rsn_time) &&
 759                      sta->sta_state != IEEE80211_STA_AUTHORIZED)) {
 760                         sta_dbg(sta->sdata, "expiring inactive %sSTA %pM\n",
 761                                 sta->sta_state != IEEE80211_STA_AUTHORIZED ?
 762                                 "not authorized " : "", sta->sta.addr);
 763
 764                         WARN_ON(__sta_info_destroy(sta));
 765                 }
 766         }
 767
 768         mutex_unlock(&local->sta_mtx);
 769 }
 770
 771 /*
 772  * This function is called with state == IEEE80211_IBSS_MLME_JOINED
 773  */
 774
 775 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
 776 {
 777         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 778         enum nl80211_bss_scan_width scan_width;
 779
 780         sdata_assert_lock(sdata);
 781
 782         mod_timer(&ifibss->timer,
 783                   round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
 784
 785         ieee80211_ibss_sta_expire(sdata);
 786
 787         if (time_before(jiffies, ifibss->last_scan_completed +
 788                        IEEE80211_IBSS_MERGE_INTERVAL))
 789                 return;
 790
 791         if (ieee80211_sta_active_ibss(sdata))
 792                 return;
 793
 794         if (ifibss->fixed_channel)
 795                 return;
 796
 797         sdata_info(sdata,
 798                    "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n");
 799
 800         scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
 801         ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len,
 802                                     NULL, scan_width);
 803 }
 804
 805 static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
 806 {
 807         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 808         u8 bssid[ETH_ALEN];
 809         u16 capability;
 810         int i;
 811
 812         sdata_assert_lock(sdata);
 813
 814         if (ifibss->fixed_bssid) {
 815                 memcpy(bssid, ifibss->bssid, ETH_ALEN);
 816         } else {
 817                 /* Generate random, not broadcast, locally administered BSSID. Mix in
 818                  * own MAC address to make sure that devices that do not have proper
 819                  * random number generator get different BSSID. */
 820                 get_random_bytes(bssid, ETH_ALEN);
 821                 for (i = 0; i < ETH_ALEN; i++)
 822                         bssid[i] ^= sdata->vif.addr[i];
 823                 bssid[0] &= ~0x01;
 824                 bssid[0] |= 0x02;
 825         }
 826
 827         sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid);
 828
 829         capability = WLAN_CAPABILITY_IBSS;
 830
 831         if (ifibss->privacy)
 832                 capability |= WLAN_CAPABILITY_PRIVACY;
 833         else
 834                 sdata->drop_unencrypted = 0;
 835
 836         __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int,
 837                                   ifibss->chandef.chan, ifibss->basic_rates,
 838                                   capability, 0, true);
 839 }
 840
 841 /*
 842  * This function is called with state == IEEE80211_IBSS_MLME_SEARCH
 843  */
 844
 845 static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
 846 {
 847         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 848         struct ieee80211_local *local = sdata->local;
 849         struct cfg80211_bss *cbss;
 850         struct ieee80211_channel *chan = NULL;
 851         const u8 *bssid = NULL;
 852         enum nl80211_bss_scan_width scan_width;
 853         int active_ibss;
 854         u16 capability;
 855
 856         sdata_assert_lock(sdata);
 857
 858         active_ibss = ieee80211_sta_active_ibss(sdata);
 859         ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss);
 860
 861         if (active_ibss)
 862                 return;
 863
 864         capability = WLAN_CAPABILITY_IBSS;
 865         if (ifibss->privacy)
 866                 capability |= WLAN_CAPABILITY_PRIVACY;
 867         if (ifibss->fixed_bssid)
 868                 bssid = ifibss->bssid;
 869         if (ifibss->fixed_channel)
 870                 chan = ifibss->chandef.chan;
 871         if (!is_zero_ether_addr(ifibss->bssid))
 872                 bssid = ifibss->bssid;
 873         cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid,
 874                                 ifibss->ssid, ifibss->ssid_len,
 875                                 WLAN_CAPABILITY_IBSS | WLAN_CAPABILITY_PRIVACY,
 876                                 capability);
 877
 878         if (cbss) {
 879                 struct ieee80211_bss *bss;
 880
 881                 bss = (void *)cbss->priv;
 882                 ibss_dbg(sdata,
 883                          "sta_find_ibss: selected %pM current %pM\n",
 884                          cbss->bssid, ifibss->bssid);
 885                 sdata_info(sdata,
 886                            "Selected IBSS BSSID %pM based on configured SSID\n",
 887                            cbss->bssid);
 888
 889                 ieee80211_sta_join_ibss(sdata, bss);
 890                 ieee80211_rx_bss_put(local, bss);
 891                 return;
 892         }
 893
 894         ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n");
 895
 896         /* Selected IBSS not found in current scan results - try to scan */
 897         if (time_after(jiffies, ifibss->last_scan_completed +
 898                                         IEEE80211_SCAN_INTERVAL)) {
 899                 sdata_info(sdata, "Trigger new scan to find an IBSS to join\n");
 900
 901                 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
 902                 ieee80211_request_ibss_scan(sdata, ifibss->ssid,
 903                                             ifibss->ssid_len, chan,
 904                                             scan_width);
 905         } else {
 906                 int interval = IEEE80211_SCAN_INTERVAL;
 907
 908                 if (time_after(jiffies, ifibss->ibss_join_req +
 909                                IEEE80211_IBSS_JOIN_TIMEOUT))
 910                         ieee80211_sta_create_ibss(sdata);
 911
 912                 mod_timer(&ifibss->timer,
 913                           round_jiffies(jiffies + interval));
 914         }
 915 }
 916
 917 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
 918                                         struct sk_buff *req)
 919 {
 920         struct ieee80211_mgmt *mgmt = (void *)req->data;
 921         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 922         struct ieee80211_local *local = sdata->local;
 923         int tx_last_beacon, len = req->len;
 924         struct sk_buff *skb;
 925         struct beacon_data *presp;
 926         u8 *pos, *end;
 927
 928         sdata_assert_lock(sdata);
 929
 930         presp = rcu_dereference_protected(ifibss->presp,
 931                                           lockdep_is_held(&sdata->wdev.mtx));
 932
 933         if (ifibss->state != IEEE80211_IBSS_MLME_JOINED ||
 934             len < 24 + 2 || !presp)
 935                 return;
 936
 937         tx_last_beacon = drv_tx_last_beacon(local);
 938
 939         ibss_dbg(sdata,
 940                  "RX ProbeReq SA=%pM DA=%pM BSSID=%pM (tx_last_beacon=%d)\n",
 941                  mgmt->sa, mgmt->da, mgmt->bssid, tx_last_beacon);
 942
 943         if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da))
 944                 return;
 945
 946         if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) &&
 947             !is_broadcast_ether_addr(mgmt->bssid))
 948                 return;
 949
 950         end = ((u8 *) mgmt) + len;
 951         pos = mgmt->u.probe_req.variable;
 952         if (pos[0] != WLAN_EID_SSID ||
 953             pos + 2 + pos[1] > end) {
 954                 ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n",
 955                          mgmt->sa);
 956                 return;
 957         }
 958         if (pos[1] != 0 &&
 959             (pos[1] != ifibss->ssid_len ||
 960              memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) {
 961                 /* Ignore ProbeReq for foreign SSID */
 962                 return;
 963         }
 964
 965         /* Reply with ProbeResp */
 966         skb = dev_alloc_skb(local->tx_headroom + presp->head_len);
 967         if (!skb)
 968                 return;
 969
 970         skb_reserve(skb, local->tx_headroom);
 971         memcpy(skb_put(skb, presp->head_len), presp->head, presp->head_len);
 972
 973         memcpy(((struct ieee80211_mgmt *) skb->data)->da, mgmt->sa, ETH_ALEN);
 974         ibss_dbg(sdata, "Sending ProbeResp to %pM\n", mgmt->sa);
 975         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 976         ieee80211_tx_skb(sdata, skb);
 977 }
 978
 979 static
 980 void ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data *sdata,
 981                                     struct ieee80211_mgmt *mgmt, size_t len,
 982                                     struct ieee80211_rx_status *rx_status)
 983 {
 984         size_t baselen;
 985         struct ieee802_11_elems elems;
 986
 987         BUILD_BUG_ON(offsetof(typeof(mgmt->u.probe_resp), variable) !=
 988                      offsetof(typeof(mgmt->u.beacon), variable));
 989
 990         /*
 991          * either beacon or probe_resp but the variable field is at the
 992          * same offset
 993          */
 994         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
 995         if (baselen > len)
 996                 return;
 997
 998         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
 999                                false, &elems);
1000
1001         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
1002 }
1003
1004 void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1005                                    struct sk_buff *skb)
1006 {
1007         struct ieee80211_rx_status *rx_status;
1008         struct ieee80211_mgmt *mgmt;
1009         u16 fc;
1010
1011         rx_status = IEEE80211_SKB_RXCB(skb);
1012         mgmt = (struct ieee80211_mgmt *) skb->data;
1013         fc = le16_to_cpu(mgmt->frame_control);
1014
1015         sdata_lock(sdata);
1016
1017         if (!sdata->u.ibss.ssid_len)
1018                 goto mgmt_out; /* not ready to merge yet */
1019
1020         switch (fc & IEEE80211_FCTL_STYPE) {
1021         case IEEE80211_STYPE_PROBE_REQ:
1022                 ieee80211_rx_mgmt_probe_req(sdata, skb);
1023                 break;
1024         case IEEE80211_STYPE_PROBE_RESP:
1025         case IEEE80211_STYPE_BEACON:
1026                 ieee80211_rx_mgmt_probe_beacon(sdata, mgmt, skb->len,
1027                                                rx_status);
1028                 break;
1029         case IEEE80211_STYPE_AUTH:
1030                 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len);
1031                 break;
1032         case IEEE80211_STYPE_DEAUTH:
1033                 ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len);
1034                 break;
1035         }
1036
1037  mgmt_out:
1038         sdata_unlock(sdata);
1039 }
1040
1041 void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata)
1042 {
1043         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1044         struct sta_info *sta;
1045
1046         sdata_lock(sdata);
1047
1048         /*
1049          * Work could be scheduled after scan or similar
1050          * when we aren't even joined (or trying) with a
1051          * network.
1052          */
1053         if (!ifibss->ssid_len)
1054                 goto out;
1055
1056         spin_lock_bh(&ifibss->incomplete_lock);
1057         while (!list_empty(&ifibss->incomplete_stations)) {
1058                 sta = list_first_entry(&ifibss->incomplete_stations,
1059                                        struct sta_info, list);
1060                 list_del(&sta->list);
1061                 spin_unlock_bh(&ifibss->incomplete_lock);
1062
1063                 ieee80211_ibss_finish_sta(sta);
1064                 rcu_read_unlock();
1065                 spin_lock_bh(&ifibss->incomplete_lock);
1066         }
1067         spin_unlock_bh(&ifibss->incomplete_lock);
1068
1069         switch (ifibss->state) {
1070         case IEEE80211_IBSS_MLME_SEARCH:
1071                 ieee80211_sta_find_ibss(sdata);
1072                 break;
1073         case IEEE80211_IBSS_MLME_JOINED:
1074                 ieee80211_sta_merge_ibss(sdata);
1075                 break;
1076         default:
1077                 WARN_ON(1);
1078                 break;
1079         }
1080
1081  out:
1082         sdata_unlock(sdata);
1083 }
1084
1085 static void ieee80211_ibss_timer(unsigned long data)
1086 {
1087         struct ieee80211_sub_if_data *sdata =
1088                 (struct ieee80211_sub_if_data *) data;
1089
1090         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1091 }
1092
1093 void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata)
1094 {
1095         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1096
1097         setup_timer(&ifibss->timer, ieee80211_ibss_timer,
1098                     (unsigned long) sdata);
1099         INIT_LIST_HEAD(&ifibss->incomplete_stations);
1100         spin_lock_init(&ifibss->incomplete_lock);
1101 }
1102
1103 /* scan finished notification */
1104 void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local)
1105 {
1106         struct ieee80211_sub_if_data *sdata;
1107
1108         mutex_lock(&local->iflist_mtx);
1109         list_for_each_entry(sdata, &local->interfaces, list) {
1110                 if (!ieee80211_sdata_running(sdata))
1111                         continue;
1112                 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
1113                         continue;
1114                 sdata->u.ibss.last_scan_completed = jiffies;
1115                 ieee80211_queue_work(&local->hw, &sdata->work);
1116         }
1117         mutex_unlock(&local->iflist_mtx);
1118 }
1119
1120 int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
1121                         struct cfg80211_ibss_params *params)
1122 {
1123         u32 changed = 0;
1124         u32 rate_flags;
1125         struct ieee80211_supported_band *sband;
1126         int i;
1127
1128         if (params->bssid) {
1129                 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN);
1130                 sdata->u.ibss.fixed_bssid = true;
1131         } else
1132                 sdata->u.ibss.fixed_bssid = false;
1133
1134         sdata->u.ibss.privacy = params->privacy;
1135         sdata->u.ibss.control_port = params->control_port;
1136         sdata->u.ibss.basic_rates = params->basic_rates;
1137
1138         /* fix basic_rates if channel does not support these rates */
1139         rate_flags = ieee80211_chandef_rate_flags(&params->chandef);
1140         sband = sdata->local->hw.wiphy->bands[params->chandef.chan->band];
1141         for (i = 0; i < sband->n_bitrates; i++) {
1142                 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
1143                         sdata->u.ibss.basic_rates &= ~BIT(i);
1144         }
1145         memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate,
1146                sizeof(params->mcast_rate));
1147
1148         sdata->vif.bss_conf.beacon_int = params->beacon_interval;
1149
1150         sdata->u.ibss.chandef = params->chandef;
1151         sdata->u.ibss.fixed_channel = params->channel_fixed;
1152
1153         if (params->ie) {
1154                 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len,
1155                                            GFP_KERNEL);
1156                 if (sdata->u.ibss.ie)
1157                         sdata->u.ibss.ie_len = params->ie_len;
1158         }
1159
1160         sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
1161         sdata->u.ibss.ibss_join_req = jiffies;
1162
1163         memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len);
1164         sdata->u.ibss.ssid_len = params->ssid_len;
1165
1166         memcpy(&sdata->u.ibss.ht_capa, &params->ht_capa,
1167                sizeof(sdata->u.ibss.ht_capa));
1168         memcpy(&sdata->u.ibss.ht_capa_mask, &params->ht_capa_mask,
1169                sizeof(sdata->u.ibss.ht_capa_mask));
1170
1171         /*
1172          * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is
1173          * reserved, but an HT STA shall protect HT transmissions as though
1174          * the HT Protection field were set to non-HT mixed mode.
1175          *
1176          * In an IBSS, the RIFS Mode field of the HT Operation element is
1177          * also reserved, but an HT STA shall operate as though this field
1178          * were set to 1.
1179          */
1180
1181         sdata->vif.bss_conf.ht_operation_mode |=
1182                   IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED
1183                 | IEEE80211_HT_PARAM_RIFS_MODE;
1184
1185         changed |= BSS_CHANGED_HT;
1186         ieee80211_bss_info_change_notify(sdata, changed);
1187
1188         sdata->smps_mode = IEEE80211_SMPS_OFF;
1189         sdata->needed_rx_chains = sdata->local->rx_chains;
1190
1191         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1192
1193         return 0;
1194 }
1195
1196 int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata)
1197 {
1198         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1199         struct ieee80211_local *local = sdata->local;
1200         struct cfg80211_bss *cbss;
1201         u16 capability;
1202         int active_ibss;
1203         struct sta_info *sta;
1204         struct beacon_data *presp;
1205
1206         active_ibss = ieee80211_sta_active_ibss(sdata);
1207
1208         if (!active_ibss && !is_zero_ether_addr(ifibss->bssid)) {
1209                 capability = WLAN_CAPABILITY_IBSS;
1210
1211                 if (ifibss->privacy)
1212                         capability |= WLAN_CAPABILITY_PRIVACY;
1213
1214                 cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->chandef.chan,
1215                                         ifibss->bssid, ifibss->ssid,
1216                                         ifibss->ssid_len, WLAN_CAPABILITY_IBSS |
1217                                         WLAN_CAPABILITY_PRIVACY,
1218                                         capability);
1219
1220                 if (cbss) {
1221                         cfg80211_unlink_bss(local->hw.wiphy, cbss);
1222                         cfg80211_put_bss(local->hw.wiphy, cbss);
1223                 }
1224         }
1225
1226         ifibss->state = IEEE80211_IBSS_MLME_SEARCH;
1227         memset(ifibss->bssid, 0, ETH_ALEN);
1228         ifibss->ssid_len = 0;
1229
1230         sta_info_flush(sdata);
1231
1232         spin_lock_bh(&ifibss->incomplete_lock);
1233         while (!list_empty(&ifibss->incomplete_stations)) {
1234                 sta = list_first_entry(&ifibss->incomplete_stations,
1235                                        struct sta_info, list);
1236                 list_del(&sta->list);
1237                 spin_unlock_bh(&ifibss->incomplete_lock);
1238
1239                 sta_info_free(local, sta);
1240                 spin_lock_bh(&ifibss->incomplete_lock);
1241         }
1242         spin_unlock_bh(&ifibss->incomplete_lock);
1243
1244         netif_carrier_off(sdata->dev);
1245
1246         /* remove beacon */
1247         kfree(sdata->u.ibss.ie);
1248         presp = rcu_dereference_protected(ifibss->presp,
1249                                           lockdep_is_held(&sdata->wdev.mtx));
1250         RCU_INIT_POINTER(sdata->u.ibss.presp, NULL);
1251
1252         /* on the next join, re-program HT parameters */
1253         memset(&ifibss->ht_capa, 0, sizeof(ifibss->ht_capa));
1254         memset(&ifibss->ht_capa_mask, 0, sizeof(ifibss->ht_capa_mask));
1255
1256         sdata->vif.bss_conf.ibss_joined = false;
1257         sdata->vif.bss_conf.ibss_creator = false;
1258         sdata->vif.bss_conf.enable_beacon = false;
1259         sdata->vif.bss_conf.ssid_len = 0;
1260         clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state);
1261         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED |
1262                                                 BSS_CHANGED_IBSS);
1263         synchronize_rcu();
1264         kfree(presp);
1265
1266         skb_queue_purge(&sdata->skb_queue);
1267
1268         del_timer_sync(&sdata->u.ibss.timer);
1269
1270         return 0;
1271 }