net/mac80211/ibss.c

   1 /*
   2  * IBSS mode implementation
   3  * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
   4  * Copyright 2004, Instant802 Networks, Inc.
   5  * Copyright 2005, Devicescape Software, Inc.
   6  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   7  * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
   8  * Copyright 2009, Johannes Berg <johannes@sipsolutions.net>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2 as
  12  * published by the Free Software Foundation.
  13  */
  14
  15 #include <linux/delay.h>
  16 #include <linux/slab.h>
  17 #include <linux/if_ether.h>
  18 #include <linux/skbuff.h>
  19 #include <linux/if_arp.h>
  20 #include <linux/etherdevice.h>
  21 #include <linux/rtnetlink.h>
  22 #include <net/mac80211.h>
  23
  24 #include "ieee80211_i.h"
  25 #include "driver-ops.h"
  26 #include "rate.h"
  27
  28 #define IEEE80211_SCAN_INTERVAL (2 * HZ)
  29 #define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ)
  30
  31 #define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ)
  32 #define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ)
  33
  34 #define IEEE80211_IBSS_MAX_STA_ENTRIES 128
  35
  36
  37 static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
  38                                       const u8 *bssid, const int beacon_int,
  39                                       struct ieee80211_channel *chan,
  40                                       const u32 basic_rates,
  41                                       const u16 capability, u64 tsf,
  42                                       bool creator)
  43 {
  44         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
  45         struct ieee80211_local *local = sdata->local;
  46         int rates_n = 0, i, ri;
  47         struct ieee80211_mgmt *mgmt;
  48         u8 *pos;
  49         struct ieee80211_supported_band *sband;
  50         struct cfg80211_bss *bss;
  51         u32 bss_change, rate_flags, rates = 0, rates_added = 0;
  52         u8 supp_rates[IEEE80211_MAX_SUPP_RATES];
  53         struct cfg80211_chan_def chandef;
  54         enum nl80211_bss_scan_width scan_width;
  55         struct beacon_data *presp;
  56         int frame_len;
  57         int shift;
  58
  59         sdata_assert_lock(sdata);
  60
  61         /* Reset own TSF to allow time synchronization work. */
  62         drv_reset_tsf(local, sdata);
  63
  64         if (!ether_addr_equal(ifibss->bssid, bssid))
  65                 sta_info_flush(sdata);
  66
  67         /* if merging, indicate to driver that we leave the old IBSS */
  68         if (sdata->vif.bss_conf.ibss_joined) {
  69                 sdata->vif.bss_conf.ibss_joined = false;
  70                 sdata->vif.bss_conf.ibss_creator = false;
  71                 sdata->vif.bss_conf.enable_beacon = false;
  72                 netif_carrier_off(sdata->dev);
  73                 ieee80211_bss_info_change_notify(sdata,
  74                                                  BSS_CHANGED_IBSS |
  75                                                  BSS_CHANGED_BEACON_ENABLED);
  76         }
  77
  78         presp = rcu_dereference_protected(ifibss->presp,
  79                                           lockdep_is_held(&sdata->wdev.mtx));
  80         rcu_assign_pointer(ifibss->presp, NULL);
  81         if (presp)
  82                 kfree_rcu(presp, rcu_head);
  83
  84         sdata->drop_unencrypted = capability & WLAN_CAPABILITY_PRIVACY ? 1 : 0;
  85
  86         chandef = ifibss->chandef;
  87         if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef)) {
  88                 chandef.width = NL80211_CHAN_WIDTH_20;
  89                 chandef.center_freq1 = chan->center_freq;
  90         }
  91
  92         ieee80211_vif_release_channel(sdata);
  93         if (ieee80211_vif_use_channel(sdata, &chandef,
  94                                       ifibss->fixed_channel ?
  95                                         IEEE80211_CHANCTX_SHARED :
  96                                         IEEE80211_CHANCTX_EXCLUSIVE)) {
  97                 sdata_info(sdata, "Failed to join IBSS, no channel context\n");
  98                 return;
  99         }
 100
 101         memcpy(ifibss->bssid, bssid, ETH_ALEN);
 102
 103         sband = local->hw.wiphy->bands[chan->band];
 104         shift = ieee80211_vif_get_shift(&sdata->vif);
 105
 106         /* Build IBSS probe response */
 107         frame_len = sizeof(struct ieee80211_hdr_3addr) +
 108                     12 /* struct ieee80211_mgmt.u.beacon */ +
 109                     2 + IEEE80211_MAX_SSID_LEN /* max SSID */ +
 110                     2 + 8 /* max Supported Rates */ +
 111                     3 /* max DS params */ +
 112                     4 /* IBSS params */ +
 113                     2 + (IEEE80211_MAX_SUPP_RATES - 8) +
 114                     2 + sizeof(struct ieee80211_ht_cap) +
 115                     2 + sizeof(struct ieee80211_ht_operation) +
 116                     ifibss->ie_len;
 117         presp = kzalloc(sizeof(*presp) + frame_len, GFP_KERNEL);
 118         if (!presp)
 119                 return;
 120
 121         presp->head = (void *)(presp + 1);
 122
 123         mgmt = (void *) presp->head;
 124         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 125                                           IEEE80211_STYPE_PROBE_RESP);
 126         eth_broadcast_addr(mgmt->da);
 127         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 128         memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN);
 129         mgmt->u.beacon.beacon_int = cpu_to_le16(beacon_int);
 130         mgmt->u.beacon.timestamp = cpu_to_le64(tsf);
 131         mgmt->u.beacon.capab_info = cpu_to_le16(capability);
 132
 133         pos = (u8 *)mgmt + offsetof(struct ieee80211_mgmt, u.beacon.variable);
 134
 135         *pos++ = WLAN_EID_SSID;
 136         *pos++ = ifibss->ssid_len;
 137         memcpy(pos, ifibss->ssid, ifibss->ssid_len);
 138         pos += ifibss->ssid_len;
 139
 140         rate_flags = ieee80211_chandef_rate_flags(&chandef);
 141         for (i = 0; i < sband->n_bitrates; i++) {
 142                 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
 143                         continue;
 144
 145                 rates |= BIT(i);
 146                 rates_n++;
 147         }
 148
 149         *pos++ = WLAN_EID_SUPP_RATES;
 150         *pos++ = min_t(int, 8, rates_n);
 151         for (ri = 0; ri < sband->n_bitrates; ri++) {
 152                 int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate,
 153                                         5 * (1 << shift));
 154                 u8 basic = 0;
 155                 if (!(rates & BIT(ri)))
 156                         continue;
 157
 158                 if (basic_rates & BIT(ri))
 159                         basic = 0x80;
 160                 *pos++ = basic | (u8) rate;
 161                 if (++rates_added == 8)
 162                         break;
 163         }
 164
 165         if (sband->band == IEEE80211_BAND_2GHZ) {
 166                 *pos++ = WLAN_EID_DS_PARAMS;
 167                 *pos++ = 1;
 168                 *pos++ = ieee80211_frequency_to_channel(chan->center_freq);
 169         }
 170
 171         *pos++ = WLAN_EID_IBSS_PARAMS;
 172         *pos++ = 2;
 173         /* FIX: set ATIM window based on scan results */
 174         *pos++ = 0;
 175         *pos++ = 0;
 176
 177         /* put the remaining rates in WLAN_EID_EXT_SUPP_RATES */
 178         if (rates_n > 8) {
 179                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 180                 *pos++ = rates_n - 8;
 181                 for (; ri < sband->n_bitrates; ri++) {
 182                         int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate,
 183                                                 5 * (1 << shift));
 184                         u8 basic = 0;
 185                         if (!(rates & BIT(ri)))
 186                                 continue;
 187
 188                         if (basic_rates & BIT(ri))
 189                                 basic = 0x80;
 190                         *pos++ = basic | (u8) rate;
 191                 }
 192         }
 193
 194         if (ifibss->ie_len) {
 195                 memcpy(pos, ifibss->ie, ifibss->ie_len);
 196                 pos += ifibss->ie_len;
 197         }
 198
 199         /* add HT capability and information IEs */
 200         if (chandef.width != NL80211_CHAN_WIDTH_20_NOHT &&
 201             chandef.width != NL80211_CHAN_WIDTH_5 &&
 202             chandef.width != NL80211_CHAN_WIDTH_10 &&
 203             sband->ht_cap.ht_supported) {
 204                 struct ieee80211_sta_ht_cap ht_cap;
 205
 206                 memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
 207                 ieee80211_apply_htcap_overrides(sdata, &ht_cap);
 208
 209                 pos = ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap);
 210                 /*
 211                  * Note: According to 802.11n-2009 9.13.3.1, HT Protection
 212                  * field and RIFS Mode are reserved in IBSS mode, therefore
 213                  * keep them at 0
 214                  */
 215                 pos = ieee80211_ie_build_ht_oper(pos, &sband->ht_cap,
 216                                                  &chandef, 0);
 217         }
 218
 219         if (local->hw.queues >= IEEE80211_NUM_ACS) {
 220                 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
 221                 *pos++ = 7; /* len */
 222                 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
 223                 *pos++ = 0x50;
 224                 *pos++ = 0xf2;
 225                 *pos++ = 2; /* WME */
 226                 *pos++ = 0; /* WME info */
 227                 *pos++ = 1; /* WME ver */
 228                 *pos++ = 0; /* U-APSD no in use */
 229         }
 230
 231         presp->head_len = pos - presp->head;
 232         if (WARN_ON(presp->head_len > frame_len))
 233                 return;
 234
 235         rcu_assign_pointer(ifibss->presp, presp);
 236
 237         sdata->vif.bss_conf.enable_beacon = true;
 238         sdata->vif.bss_conf.beacon_int = beacon_int;
 239         sdata->vif.bss_conf.basic_rates = basic_rates;
 240         sdata->vif.bss_conf.ssid_len = ifibss->ssid_len;
 241         memcpy(sdata->vif.bss_conf.ssid, ifibss->ssid, ifibss->ssid_len);
 242         bss_change = BSS_CHANGED_BEACON_INT;
 243         bss_change |= ieee80211_reset_erp_info(sdata);
 244         bss_change |= BSS_CHANGED_BSSID;
 245         bss_change |= BSS_CHANGED_BEACON;
 246         bss_change |= BSS_CHANGED_BEACON_ENABLED;
 247         bss_change |= BSS_CHANGED_BASIC_RATES;
 248         bss_change |= BSS_CHANGED_HT;
 249         bss_change |= BSS_CHANGED_IBSS;
 250         bss_change |= BSS_CHANGED_SSID;
 251
 252         /*
 253          * In 5 GHz/802.11a, we can always use short slot time.
 254          * (IEEE 802.11-2012 18.3.8.7)
 255          *
 256          * In 2.4GHz, we must always use long slots in IBSS for compatibility
 257          * reasons.
 258          * (IEEE 802.11-2012 19.4.5)
 259          *
 260          * HT follows these specifications (IEEE 802.11-2012 20.3.18)
 261          */
 262         sdata->vif.bss_conf.use_short_slot = chan->band == IEEE80211_BAND_5GHZ;
 263         bss_change |= BSS_CHANGED_ERP_SLOT;
 264
 265         sdata->vif.bss_conf.ibss_joined = true;
 266         sdata->vif.bss_conf.ibss_creator = creator;
 267         ieee80211_bss_info_change_notify(sdata, bss_change);
 268
 269         ieee80211_sta_def_wmm_params(sdata, rates, supp_rates);
 270
 271         ifibss->state = IEEE80211_IBSS_MLME_JOINED;
 272         mod_timer(&ifibss->timer,
 273                   round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
 274
 275         scan_width = cfg80211_chandef_to_scan_width(&chandef);
 276         bss = cfg80211_inform_bss_width_frame(local->hw.wiphy, chan,
 277                                               scan_width, mgmt,
 278                                               presp->head_len, 0, GFP_KERNEL);
 279         cfg80211_put_bss(local->hw.wiphy, bss);
 280         netif_carrier_on(sdata->dev);
 281         cfg80211_ibss_joined(sdata->dev, ifibss->bssid, GFP_KERNEL);
 282 }
 283
 284 static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
 285                                     struct ieee80211_bss *bss)
 286 {
 287         struct cfg80211_bss *cbss =
 288                 container_of((void *)bss, struct cfg80211_bss, priv);
 289         struct ieee80211_supported_band *sband;
 290         u32 basic_rates;
 291         int i, j;
 292         u16 beacon_int = cbss->beacon_interval;
 293         const struct cfg80211_bss_ies *ies;
 294         u64 tsf;
 295         u32 rate_flags;
 296         int shift;
 297
 298         sdata_assert_lock(sdata);
 299
 300         if (beacon_int < 10)
 301                 beacon_int = 10;
 302
 303         sband = sdata->local->hw.wiphy->bands[cbss->channel->band];
 304         rate_flags = ieee80211_chandef_rate_flags(&sdata->u.ibss.chandef);
 305         shift = ieee80211_vif_get_shift(&sdata->vif);
 306
 307         basic_rates = 0;
 308
 309         for (i = 0; i < bss->supp_rates_len; i++) {
 310                 int rate = bss->supp_rates[i] & 0x7f;
 311                 bool is_basic = !!(bss->supp_rates[i] & 0x80);
 312
 313                 for (j = 0; j < sband->n_bitrates; j++) {
 314                         int brate;
 315                         if ((rate_flags & sband->bitrates[j].flags)
 316                             != rate_flags)
 317                                 continue;
 318
 319                         brate = DIV_ROUND_UP(sband->bitrates[j].bitrate,
 320                                              5 * (1 << shift));
 321                         if (brate == rate) {
 322                                 if (is_basic)
 323                                         basic_rates |= BIT(j);
 324                                 break;
 325                         }
 326                 }
 327         }
 328
 329         rcu_read_lock();
 330         ies = rcu_dereference(cbss->ies);
 331         tsf = ies->tsf;
 332         rcu_read_unlock();
 333
 334         __ieee80211_sta_join_ibss(sdata, cbss->bssid,
 335                                   beacon_int,
 336                                   cbss->channel,
 337                                   basic_rates,
 338                                   cbss->capability,
 339                                   tsf, false);
 340 }
 341
 342 static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta)
 343         __acquires(RCU)
 344 {
 345         struct ieee80211_sub_if_data *sdata = sta->sdata;
 346         u8 addr[ETH_ALEN];
 347
 348         memcpy(addr, sta->sta.addr, ETH_ALEN);
 349
 350         ibss_dbg(sdata, "Adding new IBSS station %pM\n", addr);
 351
 352         sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
 353         sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
 354         /* authorize the station only if the network is not RSN protected. If
 355          * not wait for the userspace to authorize it */
 356         if (!sta->sdata->u.ibss.control_port)
 357                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
 358
 359         rate_control_rate_init(sta);
 360
 361         /* If it fails, maybe we raced another insertion? */
 362         if (sta_info_insert_rcu(sta))
 363                 return sta_info_get(sdata, addr);
 364         return sta;
 365 }
 366
 367 static struct sta_info *
 368 ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, const u8 *bssid,
 369                        const u8 *addr, u32 supp_rates)
 370         __acquires(RCU)
 371 {
 372         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 373         struct ieee80211_local *local = sdata->local;
 374         struct sta_info *sta;
 375         struct ieee80211_chanctx_conf *chanctx_conf;
 376         struct ieee80211_supported_band *sband;
 377         enum nl80211_bss_scan_width scan_width;
 378         int band;
 379
 380         /*
 381          * XXX: Consider removing the least recently used entry and
 382          *      allow new one to be added.
 383          */
 384         if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
 385                 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
 386                                     sdata->name, addr);
 387                 rcu_read_lock();
 388                 return NULL;
 389         }
 390
 391         if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) {
 392                 rcu_read_lock();
 393                 return NULL;
 394         }
 395
 396         if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) {
 397                 rcu_read_lock();
 398                 return NULL;
 399         }
 400
 401         rcu_read_lock();
 402         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 403         if (WARN_ON_ONCE(!chanctx_conf))
 404                 return NULL;
 405         band = chanctx_conf->def.chan->band;
 406         scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
 407         rcu_read_unlock();
 408
 409         sta = sta_info_alloc(sdata, addr, GFP_KERNEL);
 410         if (!sta) {
 411                 rcu_read_lock();
 412                 return NULL;
 413         }
 414
 415         sta->last_rx = jiffies;
 416
 417         /* make sure mandatory rates are always added */
 418         sband = local->hw.wiphy->bands[band];
 419         sta->sta.supp_rates[band] = supp_rates |
 420                         ieee80211_mandatory_rates(sband, scan_width);
 421
 422         return ieee80211_ibss_finish_sta(sta);
 423 }
 424
 425 static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data *sdata,
 426                                           struct ieee80211_mgmt *mgmt,
 427                                           size_t len)
 428 {
 429         u16 reason = le16_to_cpu(mgmt->u.deauth.reason_code);
 430
 431         if (len < IEEE80211_DEAUTH_FRAME_LEN)
 432                 return;
 433
 434         ibss_dbg(sdata, "RX DeAuth SA=%pM DA=%pM BSSID=%pM (reason: %d)\n",
 435                  mgmt->sa, mgmt->da, mgmt->bssid, reason);
 436         sta_info_destroy_addr(sdata, mgmt->sa);
 437 }
 438
 439 static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata,
 440                                         struct ieee80211_mgmt *mgmt,
 441                                         size_t len)
 442 {
 443         u16 auth_alg, auth_transaction;
 444
 445         sdata_assert_lock(sdata);
 446
 447         if (len < 24 + 6)
 448                 return;
 449
 450         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
 451         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
 452
 453         ibss_dbg(sdata,
 454                  "RX Auth SA=%pM DA=%pM BSSID=%pM (auth_transaction=%d)\n",
 455                  mgmt->sa, mgmt->da, mgmt->bssid, auth_transaction);
 456
 457         if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
 458                 return;
 459
 460         /*
 461          * IEEE 802.11 standard does not require authentication in IBSS
 462          * networks and most implementations do not seem to use it.
 463          * However, try to reply to authentication attempts if someone
 464          * has actually implemented this.
 465          */
 466         ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, 0, NULL, 0,
 467                             mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0, 0);
 468 }
 469
 470 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
 471                                   struct ieee80211_mgmt *mgmt, size_t len,
 472                                   struct ieee80211_rx_status *rx_status,
 473                                   struct ieee802_11_elems *elems)
 474 {
 475         struct ieee80211_local *local = sdata->local;
 476         int freq;
 477         struct cfg80211_bss *cbss;
 478         struct ieee80211_bss *bss;
 479         struct sta_info *sta;
 480         struct ieee80211_channel *channel;
 481         u64 beacon_timestamp, rx_timestamp;
 482         u32 supp_rates = 0;
 483         enum ieee80211_band band = rx_status->band;
 484         enum nl80211_bss_scan_width scan_width;
 485         struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band];
 486         bool rates_updated = false;
 487
 488         if (elems->ds_params)
 489                 freq = ieee80211_channel_to_frequency(elems->ds_params[0],
 490                                                       band);
 491         else
 492                 freq = rx_status->freq;
 493
 494         channel = ieee80211_get_channel(local->hw.wiphy, freq);
 495
 496         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
 497                 return;
 498
 499         if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
 500             ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid)) {
 501
 502                 rcu_read_lock();
 503                 sta = sta_info_get(sdata, mgmt->sa);
 504
 505                 if (elems->supp_rates) {
 506                         supp_rates = ieee80211_sta_get_rates(sdata, elems,
 507                                                              band, NULL);
 508                         if (sta) {
 509                                 u32 prev_rates;
 510
 511                                 prev_rates = sta->sta.supp_rates[band];
 512                                 /* make sure mandatory rates are always added */
 513                                 scan_width = NL80211_BSS_CHAN_WIDTH_20;
 514                                 if (rx_status->flag & RX_FLAG_5MHZ)
 515                                         scan_width = NL80211_BSS_CHAN_WIDTH_5;
 516                                 if (rx_status->flag & RX_FLAG_10MHZ)
 517                                         scan_width = NL80211_BSS_CHAN_WIDTH_10;
 518
 519                                 sta->sta.supp_rates[band] = supp_rates |
 520                                         ieee80211_mandatory_rates(sband,
 521                                                                   scan_width);
 522                                 if (sta->sta.supp_rates[band] != prev_rates) {
 523                                         ibss_dbg(sdata,
 524                                                  "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n",
 525                                                  sta->sta.addr, prev_rates,
 526                                                  sta->sta.supp_rates[band]);
 527                                         rates_updated = true;
 528                                 }
 529                         } else {
 530                                 rcu_read_unlock();
 531                                 sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid,
 532                                                 mgmt->sa, supp_rates);
 533                         }
 534                 }
 535
 536                 if (sta && elems->wmm_info)
 537                         set_sta_flag(sta, WLAN_STA_WME);
 538
 539                 if (sta && elems->ht_operation && elems->ht_cap_elem &&
 540                     sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20_NOHT &&
 541                     sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_5 &&
 542                     sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_10) {
 543                         /* we both use HT */
 544                         struct ieee80211_ht_cap htcap_ie;
 545                         struct cfg80211_chan_def chandef;
 546
 547                         ieee80211_ht_oper_to_chandef(channel,
 548                                                      elems->ht_operation,
 549                                                      &chandef);
 550
 551                         memcpy(&htcap_ie, elems->ht_cap_elem, sizeof(htcap_ie));
 552
 553                         /*
 554                          * fall back to HT20 if we don't use or use
 555                          * the other extension channel
 556                          */
 557                         if (chandef.center_freq1 !=
 558                             sdata->u.ibss.chandef.center_freq1)
 559                                 htcap_ie.cap_info &=
 560                                         cpu_to_le16(~IEEE80211_HT_CAP_SUP_WIDTH_20_40);
 561
 562                         rates_updated |= ieee80211_ht_cap_ie_to_sta_ht_cap(
 563                                                 sdata, sband, &htcap_ie, sta);
 564                 }
 565
 566                 if (sta && rates_updated) {
 567                         drv_sta_rc_update(local, sdata, &sta->sta,
 568                                           IEEE80211_RC_SUPP_RATES_CHANGED);
 569                         rate_control_rate_init(sta);
 570                 }
 571
 572                 rcu_read_unlock();
 573         }
 574
 575         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
 576                                         channel);
 577         if (!bss)
 578                 return;
 579
 580         cbss = container_of((void *)bss, struct cfg80211_bss, priv);
 581
 582         /* same for beacon and probe response */
 583         beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp);
 584
 585         /* check if we need to merge IBSS */
 586
 587         /* we use a fixed BSSID */
 588         if (sdata->u.ibss.fixed_bssid)
 589                 goto put_bss;
 590
 591         /* not an IBSS */
 592         if (!(cbss->capability & WLAN_CAPABILITY_IBSS))
 593                 goto put_bss;
 594
 595         /* different channel */
 596         if (sdata->u.ibss.fixed_channel &&
 597             sdata->u.ibss.chandef.chan != cbss->channel)
 598                 goto put_bss;
 599
 600         /* different SSID */
 601         if (elems->ssid_len != sdata->u.ibss.ssid_len ||
 602             memcmp(elems->ssid, sdata->u.ibss.ssid,
 603                                 sdata->u.ibss.ssid_len))
 604                 goto put_bss;
 605
 606         /* same BSSID */
 607         if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid))
 608                 goto put_bss;
 609
 610         if (ieee80211_have_rx_timestamp(rx_status)) {
 611                 /* time when timestamp field was received */
 612                 rx_timestamp =
 613                         ieee80211_calculate_rx_timestamp(local, rx_status,
 614                                                          len + FCS_LEN, 24);
 615         } else {
 616                 /*
 617                  * second best option: get current TSF
 618                  * (will return -1 if not supported)
 619                  */
 620                 rx_timestamp = drv_get_tsf(local, sdata);
 621         }
 622
 623         ibss_dbg(sdata,
 624                  "RX beacon SA=%pM BSSID=%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
 625                  mgmt->sa, mgmt->bssid,
 626                  (unsigned long long)rx_timestamp,
 627                  (unsigned long long)beacon_timestamp,
 628                  (unsigned long long)(rx_timestamp - beacon_timestamp),
 629                  jiffies);
 630
 631         if (beacon_timestamp > rx_timestamp) {
 632                 ibss_dbg(sdata,
 633                          "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n",
 634                          mgmt->bssid);
 635                 ieee80211_sta_join_ibss(sdata, bss);
 636                 supp_rates = ieee80211_sta_get_rates(sdata, elems, band, NULL);
 637                 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa,
 638                                        supp_rates);
 639                 rcu_read_unlock();
 640         }
 641
 642  put_bss:
 643         ieee80211_rx_bss_put(local, bss);
 644 }
 645
 646 void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata,
 647                               const u8 *bssid, const u8 *addr,
 648                               u32 supp_rates)
 649 {
 650         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 651         struct ieee80211_local *local = sdata->local;
 652         struct sta_info *sta;
 653         struct ieee80211_chanctx_conf *chanctx_conf;
 654         struct ieee80211_supported_band *sband;
 655         enum nl80211_bss_scan_width scan_width;
 656         int band;
 657
 658         /*
 659          * XXX: Consider removing the least recently used entry and
 660          *      allow new one to be added.
 661          */
 662         if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
 663                 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
 664                                     sdata->name, addr);
 665                 return;
 666         }
 667
 668         if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH)
 669                 return;
 670
 671         if (!ether_addr_equal(bssid, sdata->u.ibss.bssid))
 672                 return;
 673
 674         rcu_read_lock();
 675         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 676         if (WARN_ON_ONCE(!chanctx_conf)) {
 677                 rcu_read_unlock();
 678                 return;
 679         }
 680         band = chanctx_conf->def.chan->band;
 681         scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
 682         rcu_read_unlock();
 683
 684         sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
 685         if (!sta)
 686                 return;
 687
 688         sta->last_rx = jiffies;
 689
 690         /* make sure mandatory rates are always added */
 691         sband = local->hw.wiphy->bands[band];
 692         sta->sta.supp_rates[band] = supp_rates |
 693                         ieee80211_mandatory_rates(sband, scan_width);
 694
 695         spin_lock(&ifibss->incomplete_lock);
 696         list_add(&sta->list, &ifibss->incomplete_stations);
 697         spin_unlock(&ifibss->incomplete_lock);
 698         ieee80211_queue_work(&local->hw, &sdata->work);
 699 }
 700
 701 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
 702 {
 703         struct ieee80211_local *local = sdata->local;
 704         int active = 0;
 705         struct sta_info *sta;
 706
 707         sdata_assert_lock(sdata);
 708
 709         rcu_read_lock();
 710
 711         list_for_each_entry_rcu(sta, &local->sta_list, list) {
 712                 if (sta->sdata == sdata &&
 713                     time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
 714                                jiffies)) {
 715                         active++;
 716                         break;
 717                 }
 718         }
 719
 720         rcu_read_unlock();
 721
 722         return active;
 723 }
 724
 725 /*
 726  * This function is called with state == IEEE80211_IBSS_MLME_JOINED
 727  */
 728
 729 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
 730 {
 731         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 732         enum nl80211_bss_scan_width scan_width;
 733
 734         sdata_assert_lock(sdata);
 735
 736         mod_timer(&ifibss->timer,
 737                   round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
 738
 739         ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT);
 740
 741         if (time_before(jiffies, ifibss->last_scan_completed +
 742                        IEEE80211_IBSS_MERGE_INTERVAL))
 743                 return;
 744
 745         if (ieee80211_sta_active_ibss(sdata))
 746                 return;
 747
 748         if (ifibss->fixed_channel)
 749                 return;
 750
 751         sdata_info(sdata,
 752                    "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n");
 753
 754         scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
 755         ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len,
 756                                     NULL, scan_width);
 757 }
 758
 759 static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
 760 {
 761         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 762         u8 bssid[ETH_ALEN];
 763         u16 capability;
 764         int i;
 765
 766         sdata_assert_lock(sdata);
 767
 768         if (ifibss->fixed_bssid) {
 769                 memcpy(bssid, ifibss->bssid, ETH_ALEN);
 770         } else {
 771                 /* Generate random, not broadcast, locally administered BSSID. Mix in
 772                  * own MAC address to make sure that devices that do not have proper
 773                  * random number generator get different BSSID. */
 774                 get_random_bytes(bssid, ETH_ALEN);
 775                 for (i = 0; i < ETH_ALEN; i++)
 776                         bssid[i] ^= sdata->vif.addr[i];
 777                 bssid[0] &= ~0x01;
 778                 bssid[0] |= 0x02;
 779         }
 780
 781         sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid);
 782
 783         capability = WLAN_CAPABILITY_IBSS;
 784
 785         if (ifibss->privacy)
 786                 capability |= WLAN_CAPABILITY_PRIVACY;
 787         else
 788                 sdata->drop_unencrypted = 0;
 789
 790         __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int,
 791                                   ifibss->chandef.chan, ifibss->basic_rates,
 792                                   capability, 0, true);
 793 }
 794
 795 /*
 796  * This function is called with state == IEEE80211_IBSS_MLME_SEARCH
 797  */
 798
 799 static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
 800 {
 801         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 802         struct ieee80211_local *local = sdata->local;
 803         struct cfg80211_bss *cbss;
 804         struct ieee80211_channel *chan = NULL;
 805         const u8 *bssid = NULL;
 806         enum nl80211_bss_scan_width scan_width;
 807         int active_ibss;
 808         u16 capability;
 809
 810         sdata_assert_lock(sdata);
 811
 812         active_ibss = ieee80211_sta_active_ibss(sdata);
 813         ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss);
 814
 815         if (active_ibss)
 816                 return;
 817
 818         capability = WLAN_CAPABILITY_IBSS;
 819         if (ifibss->privacy)
 820                 capability |= WLAN_CAPABILITY_PRIVACY;
 821         if (ifibss->fixed_bssid)
 822                 bssid = ifibss->bssid;
 823         if (ifibss->fixed_channel)
 824                 chan = ifibss->chandef.chan;
 825         if (!is_zero_ether_addr(ifibss->bssid))
 826                 bssid = ifibss->bssid;
 827         cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid,
 828                                 ifibss->ssid, ifibss->ssid_len,
 829                                 WLAN_CAPABILITY_IBSS | WLAN_CAPABILITY_PRIVACY,
 830                                 capability);
 831
 832         if (cbss) {
 833                 struct ieee80211_bss *bss;
 834
 835                 bss = (void *)cbss->priv;
 836                 ibss_dbg(sdata,
 837                          "sta_find_ibss: selected %pM current %pM\n",
 838                          cbss->bssid, ifibss->bssid);
 839                 sdata_info(sdata,
 840                            "Selected IBSS BSSID %pM based on configured SSID\n",
 841                            cbss->bssid);
 842
 843                 ieee80211_sta_join_ibss(sdata, bss);
 844                 ieee80211_rx_bss_put(local, bss);
 845                 return;
 846         }
 847
 848         ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n");
 849
 850         /* Selected IBSS not found in current scan results - try to scan */
 851         if (time_after(jiffies, ifibss->last_scan_completed +
 852                                         IEEE80211_SCAN_INTERVAL)) {
 853                 sdata_info(sdata, "Trigger new scan to find an IBSS to join\n");
 854
 855                 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
 856                 ieee80211_request_ibss_scan(sdata, ifibss->ssid,
 857                                             ifibss->ssid_len, chan,
 858                                             scan_width);
 859         } else {
 860                 int interval = IEEE80211_SCAN_INTERVAL;
 861
 862                 if (time_after(jiffies, ifibss->ibss_join_req +
 863                                IEEE80211_IBSS_JOIN_TIMEOUT))
 864                         ieee80211_sta_create_ibss(sdata);
 865
 866                 mod_timer(&ifibss->timer,
 867                           round_jiffies(jiffies + interval));
 868         }
 869 }
 870
 871 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
 872                                         struct sk_buff *req)
 873 {
 874         struct ieee80211_mgmt *mgmt = (void *)req->data;
 875         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 876         struct ieee80211_local *local = sdata->local;
 877         int tx_last_beacon, len = req->len;
 878         struct sk_buff *skb;
 879         struct beacon_data *presp;
 880         u8 *pos, *end;
 881
 882         sdata_assert_lock(sdata);
 883
 884         presp = rcu_dereference_protected(ifibss->presp,
 885                                           lockdep_is_held(&sdata->wdev.mtx));
 886
 887         if (ifibss->state != IEEE80211_IBSS_MLME_JOINED ||
 888             len < 24 + 2 || !presp)
 889                 return;
 890
 891         tx_last_beacon = drv_tx_last_beacon(local);
 892
 893         ibss_dbg(sdata,
 894                  "RX ProbeReq SA=%pM DA=%pM BSSID=%pM (tx_last_beacon=%d)\n",
 895                  mgmt->sa, mgmt->da, mgmt->bssid, tx_last_beacon);
 896
 897         if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da))
 898                 return;
 899
 900         if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) &&
 901             !is_broadcast_ether_addr(mgmt->bssid))
 902                 return;
 903
 904         end = ((u8 *) mgmt) + len;
 905         pos = mgmt->u.probe_req.variable;
 906         if (pos[0] != WLAN_EID_SSID ||
 907             pos + 2 + pos[1] > end) {
 908                 ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n",
 909                          mgmt->sa);
 910                 return;
 911         }
 912         if (pos[1] != 0 &&
 913             (pos[1] != ifibss->ssid_len ||
 914              memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) {
 915                 /* Ignore ProbeReq for foreign SSID */
 916                 return;
 917         }
 918
 919         /* Reply with ProbeResp */
 920         skb = dev_alloc_skb(local->tx_headroom + presp->head_len);
 921         if (!skb)
 922                 return;
 923
 924         skb_reserve(skb, local->tx_headroom);
 925         memcpy(skb_put(skb, presp->head_len), presp->head, presp->head_len);
 926
 927         memcpy(((struct ieee80211_mgmt *) skb->data)->da, mgmt->sa, ETH_ALEN);
 928         ibss_dbg(sdata, "Sending ProbeResp to %pM\n", mgmt->sa);
 929         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 930         ieee80211_tx_skb(sdata, skb);
 931 }
 932
 933 static
 934 void ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data *sdata,
 935                                     struct ieee80211_mgmt *mgmt, size_t len,
 936                                     struct ieee80211_rx_status *rx_status)
 937 {
 938         size_t baselen;
 939         struct ieee802_11_elems elems;
 940
 941         BUILD_BUG_ON(offsetof(typeof(mgmt->u.probe_resp), variable) !=
 942                      offsetof(typeof(mgmt->u.beacon), variable));
 943
 944         /*
 945          * either beacon or probe_resp but the variable field is at the
 946          * same offset
 947          */
 948         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
 949         if (baselen > len)
 950                 return;
 951
 952         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
 953                                false, &elems);
 954
 955         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
 956 }
 957
 958 void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
 959                                    struct sk_buff *skb)
 960 {
 961         struct ieee80211_rx_status *rx_status;
 962         struct ieee80211_mgmt *mgmt;
 963         u16 fc;
 964
 965         rx_status = IEEE80211_SKB_RXCB(skb);
 966         mgmt = (struct ieee80211_mgmt *) skb->data;
 967         fc = le16_to_cpu(mgmt->frame_control);
 968
 969         sdata_lock(sdata);
 970
 971         if (!sdata->u.ibss.ssid_len)
 972                 goto mgmt_out; /* not ready to merge yet */
 973
 974         switch (fc & IEEE80211_FCTL_STYPE) {
 975         case IEEE80211_STYPE_PROBE_REQ:
 976                 ieee80211_rx_mgmt_probe_req(sdata, skb);
 977                 break;
 978         case IEEE80211_STYPE_PROBE_RESP:
 979         case IEEE80211_STYPE_BEACON:
 980                 ieee80211_rx_mgmt_probe_beacon(sdata, mgmt, skb->len,
 981                                                rx_status);
 982                 break;
 983         case IEEE80211_STYPE_AUTH:
 984                 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len);
 985                 break;
 986         case IEEE80211_STYPE_DEAUTH:
 987                 ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len);
 988                 break;
 989         }
 990
 991  mgmt_out:
 992         sdata_unlock(sdata);
 993 }
 994
 995 void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata)
 996 {
 997         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 998         struct sta_info *sta;
 999
1000         sdata_lock(sdata);
1001
1002         /*
1003          * Work could be scheduled after scan or similar
1004          * when we aren't even joined (or trying) with a
1005          * network.
1006          */
1007         if (!ifibss->ssid_len)
1008                 goto out;
1009
1010         spin_lock_bh(&ifibss->incomplete_lock);
1011         while (!list_empty(&ifibss->incomplete_stations)) {
1012                 sta = list_first_entry(&ifibss->incomplete_stations,
1013                                        struct sta_info, list);
1014                 list_del(&sta->list);
1015                 spin_unlock_bh(&ifibss->incomplete_lock);
1016
1017                 ieee80211_ibss_finish_sta(sta);
1018                 rcu_read_unlock();
1019                 spin_lock_bh(&ifibss->incomplete_lock);
1020         }
1021         spin_unlock_bh(&ifibss->incomplete_lock);
1022
1023         switch (ifibss->state) {
1024         case IEEE80211_IBSS_MLME_SEARCH:
1025                 ieee80211_sta_find_ibss(sdata);
1026                 break;
1027         case IEEE80211_IBSS_MLME_JOINED:
1028                 ieee80211_sta_merge_ibss(sdata);
1029                 break;
1030         default:
1031                 WARN_ON(1);
1032                 break;
1033         }
1034
1035  out:
1036         sdata_unlock(sdata);
1037 }
1038
1039 static void ieee80211_ibss_timer(unsigned long data)
1040 {
1041         struct ieee80211_sub_if_data *sdata =
1042                 (struct ieee80211_sub_if_data *) data;
1043
1044         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1045 }
1046
1047 void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata)
1048 {
1049         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1050
1051         setup_timer(&ifibss->timer, ieee80211_ibss_timer,
1052                     (unsigned long) sdata);
1053         INIT_LIST_HEAD(&ifibss->incomplete_stations);
1054         spin_lock_init(&ifibss->incomplete_lock);
1055 }
1056
1057 /* scan finished notification */
1058 void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local)
1059 {
1060         struct ieee80211_sub_if_data *sdata;
1061
1062         mutex_lock(&local->iflist_mtx);
1063         list_for_each_entry(sdata, &local->interfaces, list) {
1064                 if (!ieee80211_sdata_running(sdata))
1065                         continue;
1066                 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
1067                         continue;
1068                 sdata->u.ibss.last_scan_completed = jiffies;
1069                 ieee80211_queue_work(&local->hw, &sdata->work);
1070         }
1071         mutex_unlock(&local->iflist_mtx);
1072 }
1073
1074 int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
1075                         struct cfg80211_ibss_params *params)
1076 {
1077         u32 changed = 0;
1078         u32 rate_flags;
1079         struct ieee80211_supported_band *sband;
1080         int i;
1081
1082         if (params->bssid) {
1083                 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN);
1084                 sdata->u.ibss.fixed_bssid = true;
1085         } else
1086                 sdata->u.ibss.fixed_bssid = false;
1087
1088         sdata->u.ibss.privacy = params->privacy;
1089         sdata->u.ibss.control_port = params->control_port;
1090         sdata->u.ibss.basic_rates = params->basic_rates;
1091
1092         /* fix basic_rates if channel does not support these rates */
1093         rate_flags = ieee80211_chandef_rate_flags(&params->chandef);
1094         sband = sdata->local->hw.wiphy->bands[params->chandef.chan->band];
1095         for (i = 0; i < sband->n_bitrates; i++) {
1096                 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
1097                         sdata->u.ibss.basic_rates &= ~BIT(i);
1098         }
1099         memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate,
1100                sizeof(params->mcast_rate));
1101
1102         sdata->vif.bss_conf.beacon_int = params->beacon_interval;
1103
1104         sdata->u.ibss.chandef = params->chandef;
1105         sdata->u.ibss.fixed_channel = params->channel_fixed;
1106
1107         if (params->ie) {
1108                 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len,
1109                                            GFP_KERNEL);
1110                 if (sdata->u.ibss.ie)
1111                         sdata->u.ibss.ie_len = params->ie_len;
1112         }
1113
1114         sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
1115         sdata->u.ibss.ibss_join_req = jiffies;
1116
1117         memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len);
1118         sdata->u.ibss.ssid_len = params->ssid_len;
1119
1120         memcpy(&sdata->u.ibss.ht_capa, &params->ht_capa,
1121                sizeof(sdata->u.ibss.ht_capa));
1122         memcpy(&sdata->u.ibss.ht_capa_mask, &params->ht_capa_mask,
1123                sizeof(sdata->u.ibss.ht_capa_mask));
1124
1125         /*
1126          * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is
1127          * reserved, but an HT STA shall protect HT transmissions as though
1128          * the HT Protection field were set to non-HT mixed mode.
1129          *
1130          * In an IBSS, the RIFS Mode field of the HT Operation element is
1131          * also reserved, but an HT STA shall operate as though this field
1132          * were set to 1.
1133          */
1134
1135         sdata->vif.bss_conf.ht_operation_mode |=
1136                   IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED
1137                 | IEEE80211_HT_PARAM_RIFS_MODE;
1138
1139         changed |= BSS_CHANGED_HT;
1140         ieee80211_bss_info_change_notify(sdata, changed);
1141
1142         sdata->smps_mode = IEEE80211_SMPS_OFF;
1143         sdata->needed_rx_chains = sdata->local->rx_chains;
1144
1145         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1146
1147         return 0;
1148 }
1149
1150 int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata)
1151 {
1152         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1153         struct ieee80211_local *local = sdata->local;
1154         struct cfg80211_bss *cbss;
1155         u16 capability;
1156         int active_ibss;
1157         struct sta_info *sta;
1158         struct beacon_data *presp;
1159
1160         active_ibss = ieee80211_sta_active_ibss(sdata);
1161
1162         if (!active_ibss && !is_zero_ether_addr(ifibss->bssid)) {
1163                 capability = WLAN_CAPABILITY_IBSS;
1164
1165                 if (ifibss->privacy)
1166                         capability |= WLAN_CAPABILITY_PRIVACY;
1167
1168                 cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->chandef.chan,
1169                                         ifibss->bssid, ifibss->ssid,
1170                                         ifibss->ssid_len, WLAN_CAPABILITY_IBSS |
1171                                         WLAN_CAPABILITY_PRIVACY,
1172                                         capability);
1173
1174                 if (cbss) {
1175                         cfg80211_unlink_bss(local->hw.wiphy, cbss);
1176                         cfg80211_put_bss(local->hw.wiphy, cbss);
1177                 }
1178         }
1179
1180         ifibss->state = IEEE80211_IBSS_MLME_SEARCH;
1181         memset(ifibss->bssid, 0, ETH_ALEN);
1182         ifibss->ssid_len = 0;
1183
1184         sta_info_flush(sdata);
1185
1186         spin_lock_bh(&ifibss->incomplete_lock);
1187         while (!list_empty(&ifibss->incomplete_stations)) {
1188                 sta = list_first_entry(&ifibss->incomplete_stations,
1189                                        struct sta_info, list);
1190                 list_del(&sta->list);
1191                 spin_unlock_bh(&ifibss->incomplete_lock);
1192
1193                 sta_info_free(local, sta);
1194                 spin_lock_bh(&ifibss->incomplete_lock);
1195         }
1196         spin_unlock_bh(&ifibss->incomplete_lock);
1197
1198         netif_carrier_off(sdata->dev);
1199
1200         /* remove beacon */
1201         kfree(sdata->u.ibss.ie);
1202         presp = rcu_dereference_protected(ifibss->presp,
1203                                           lockdep_is_held(&sdata->wdev.mtx));
1204         RCU_INIT_POINTER(sdata->u.ibss.presp, NULL);
1205
1206         /* on the next join, re-program HT parameters */
1207         memset(&ifibss->ht_capa, 0, sizeof(ifibss->ht_capa));
1208         memset(&ifibss->ht_capa_mask, 0, sizeof(ifibss->ht_capa_mask));
1209
1210         sdata->vif.bss_conf.ibss_joined = false;
1211         sdata->vif.bss_conf.ibss_creator = false;
1212         sdata->vif.bss_conf.enable_beacon = false;
1213         sdata->vif.bss_conf.ssid_len = 0;
1214         clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state);
1215         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED |
1216                                                 BSS_CHANGED_IBSS);
1217         synchronize_rcu();
1218         kfree(presp);
1219
1220         skb_queue_purge(&sdata->skb_queue);
1221
1222         del_timer_sync(&sdata->u.ibss.timer);
1223
1224         return 0;
1225 }