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  * Copyright 2013-2014  Intel Mobile Communications GmbH
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License version 2 as
  13  * published by the Free Software Foundation.
  14  */
  15
  16 #include <linux/delay.h>
  17 #include <linux/slab.h>
  18 #include <linux/if_ether.h>
  19 #include <linux/skbuff.h>
  20 #include <linux/if_arp.h>
  21 #include <linux/etherdevice.h>
  22 #include <linux/rtnetlink.h>
  23 #include <net/mac80211.h>
  24
  25 #include "ieee80211_i.h"
  26 #include "driver-ops.h"
  27 #include "rate.h"
  28
  29 #define IEEE80211_SCAN_INTERVAL (2 * HZ)
  30 #define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ)
  31
  32 #define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ)
  33 #define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ)
  34 #define IEEE80211_IBSS_RSN_INACTIVITY_LIMIT (10 * HZ)
  35
  36 #define IEEE80211_IBSS_MAX_STA_ENTRIES 128
  37
  38 static struct beacon_data *
  39 ieee80211_ibss_build_presp(struct ieee80211_sub_if_data *sdata,
  40                            const int beacon_int, const u32 basic_rates,
  41                            const u16 capability, u64 tsf,
  42                            struct cfg80211_chan_def *chandef,
  43                            bool *have_higher_than_11mbit,
  44                            struct cfg80211_csa_settings *csa_settings)
  45 {
  46         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
  47         struct ieee80211_local *local = sdata->local;
  48         int rates_n = 0, i, ri;
  49         struct ieee80211_mgmt *mgmt;
  50         u8 *pos;
  51         struct ieee80211_supported_band *sband;
  52         u32 rate_flags, rates = 0, rates_added = 0;
  53         struct beacon_data *presp;
  54         int frame_len;
  55         int shift;
  56
  57         /* Build IBSS probe response */
  58         frame_len = sizeof(struct ieee80211_hdr_3addr) +
  59                     12 /* struct ieee80211_mgmt.u.beacon */ +
  60                     2 + IEEE80211_MAX_SSID_LEN /* max SSID */ +
  61                     2 + 8 /* max Supported Rates */ +
  62                     3 /* max DS params */ +
  63                     4 /* IBSS params */ +
  64                     5 /* Channel Switch Announcement */ +
  65                     2 + (IEEE80211_MAX_SUPP_RATES - 8) +
  66                     2 + sizeof(struct ieee80211_ht_cap) +
  67                     2 + sizeof(struct ieee80211_ht_operation) +
  68                     ifibss->ie_len;
  69         presp = kzalloc(sizeof(*presp) + frame_len, GFP_KERNEL);
  70         if (!presp)
  71                 return NULL;
  72
  73         presp->head = (void *)(presp + 1);
  74
  75         mgmt = (void *) presp->head;
  76         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
  77                                           IEEE80211_STYPE_PROBE_RESP);
  78         eth_broadcast_addr(mgmt->da);
  79         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
  80         memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN);
  81         mgmt->u.beacon.beacon_int = cpu_to_le16(beacon_int);
  82         mgmt->u.beacon.timestamp = cpu_to_le64(tsf);
  83         mgmt->u.beacon.capab_info = cpu_to_le16(capability);
  84
  85         pos = (u8 *)mgmt + offsetof(struct ieee80211_mgmt, u.beacon.variable);
  86
  87         *pos++ = WLAN_EID_SSID;
  88         *pos++ = ifibss->ssid_len;
  89         memcpy(pos, ifibss->ssid, ifibss->ssid_len);
  90         pos += ifibss->ssid_len;
  91
  92         sband = local->hw.wiphy->bands[chandef->chan->band];
  93         rate_flags = ieee80211_chandef_rate_flags(chandef);
  94         shift = ieee80211_chandef_get_shift(chandef);
  95         rates_n = 0;
  96         if (have_higher_than_11mbit)
  97                 *have_higher_than_11mbit = false;
  98
  99         for (i = 0; i < sband->n_bitrates; i++) {
 100                 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
 101                         continue;
 102                 if (sband->bitrates[i].bitrate > 110 &&
 103                     have_higher_than_11mbit)
 104                         *have_higher_than_11mbit = true;
 105
 106                 rates |= BIT(i);
 107                 rates_n++;
 108         }
 109
 110         *pos++ = WLAN_EID_SUPP_RATES;
 111         *pos++ = min_t(int, 8, rates_n);
 112         for (ri = 0; ri < sband->n_bitrates; ri++) {
 113                 int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate,
 114                                         5 * (1 << shift));
 115                 u8 basic = 0;
 116                 if (!(rates & BIT(ri)))
 117                         continue;
 118
 119                 if (basic_rates & BIT(ri))
 120                         basic = 0x80;
 121                 *pos++ = basic | (u8) rate;
 122                 if (++rates_added == 8) {
 123                         ri++; /* continue at next rate for EXT_SUPP_RATES */
 124                         break;
 125                 }
 126         }
 127
 128         if (sband->band == IEEE80211_BAND_2GHZ) {
 129                 *pos++ = WLAN_EID_DS_PARAMS;
 130                 *pos++ = 1;
 131                 *pos++ = ieee80211_frequency_to_channel(
 132                                 chandef->chan->center_freq);
 133         }
 134
 135         *pos++ = WLAN_EID_IBSS_PARAMS;
 136         *pos++ = 2;
 137         /* FIX: set ATIM window based on scan results */
 138         *pos++ = 0;
 139         *pos++ = 0;
 140
 141         if (csa_settings) {
 142                 *pos++ = WLAN_EID_CHANNEL_SWITCH;
 143                 *pos++ = 3;
 144                 *pos++ = csa_settings->block_tx ? 1 : 0;
 145                 *pos++ = ieee80211_frequency_to_channel(
 146                                 csa_settings->chandef.chan->center_freq);
 147                 presp->csa_counter_offsets[0] = (pos - presp->head);
 148                 *pos++ = csa_settings->count;
 149         }
 150
 151         /* put the remaining rates in WLAN_EID_EXT_SUPP_RATES */
 152         if (rates_n > 8) {
 153                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 154                 *pos++ = rates_n - 8;
 155                 for (; ri < sband->n_bitrates; ri++) {
 156                         int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate,
 157                                                 5 * (1 << shift));
 158                         u8 basic = 0;
 159                         if (!(rates & BIT(ri)))
 160                                 continue;
 161
 162                         if (basic_rates & BIT(ri))
 163                                 basic = 0x80;
 164                         *pos++ = basic | (u8) rate;
 165                 }
 166         }
 167
 168         if (ifibss->ie_len) {
 169                 memcpy(pos, ifibss->ie, ifibss->ie_len);
 170                 pos += ifibss->ie_len;
 171         }
 172
 173         /* add HT capability and information IEs */
 174         if (chandef->width != NL80211_CHAN_WIDTH_20_NOHT &&
 175             chandef->width != NL80211_CHAN_WIDTH_5 &&
 176             chandef->width != NL80211_CHAN_WIDTH_10 &&
 177             sband->ht_cap.ht_supported) {
 178                 struct ieee80211_sta_ht_cap ht_cap;
 179
 180                 memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
 181                 ieee80211_apply_htcap_overrides(sdata, &ht_cap);
 182
 183                 pos = ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap);
 184                 /*
 185                  * Note: According to 802.11n-2009 9.13.3.1, HT Protection
 186                  * field and RIFS Mode are reserved in IBSS mode, therefore
 187                  * keep them at 0
 188                  */
 189                 pos = ieee80211_ie_build_ht_oper(pos, &sband->ht_cap,
 190                                                  chandef, 0);
 191         }
 192
 193         if (local->hw.queues >= IEEE80211_NUM_ACS)
 194                 pos = ieee80211_add_wmm_info_ie(pos, 0); /* U-APSD not in use */
 195
 196         presp->head_len = pos - presp->head;
 197         if (WARN_ON(presp->head_len > frame_len))
 198                 goto error;
 199
 200         return presp;
 201 error:
 202         kfree(presp);
 203         return NULL;
 204 }
 205
 206 static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
 207                                       const u8 *bssid, const int beacon_int,
 208                                       struct cfg80211_chan_def *req_chandef,
 209                                       const u32 basic_rates,
 210                                       const u16 capability, u64 tsf,
 211                                       bool creator)
 212 {
 213         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 214         struct ieee80211_local *local = sdata->local;
 215         struct ieee80211_mgmt *mgmt;
 216         struct cfg80211_bss *bss;
 217         u32 bss_change;
 218         struct cfg80211_chan_def chandef;
 219         struct ieee80211_channel *chan;
 220         struct beacon_data *presp;
 221         enum nl80211_bss_scan_width scan_width;
 222         bool have_higher_than_11mbit;
 223         bool radar_required;
 224         int err;
 225
 226         sdata_assert_lock(sdata);
 227
 228         /* Reset own TSF to allow time synchronization work. */
 229         drv_reset_tsf(local, sdata);
 230
 231         if (!ether_addr_equal(ifibss->bssid, bssid))
 232                 sta_info_flush(sdata);
 233
 234         /* if merging, indicate to driver that we leave the old IBSS */
 235         if (sdata->vif.bss_conf.ibss_joined) {
 236                 sdata->vif.bss_conf.ibss_joined = false;
 237                 sdata->vif.bss_conf.ibss_creator = false;
 238                 sdata->vif.bss_conf.enable_beacon = false;
 239                 netif_carrier_off(sdata->dev);
 240                 ieee80211_bss_info_change_notify(sdata,
 241                                                  BSS_CHANGED_IBSS |
 242                                                  BSS_CHANGED_BEACON_ENABLED);
 243                 drv_leave_ibss(local, sdata);
 244         }
 245
 246         presp = rcu_dereference_protected(ifibss->presp,
 247                                           lockdep_is_held(&sdata->wdev.mtx));
 248         RCU_INIT_POINTER(ifibss->presp, NULL);
 249         if (presp)
 250                 kfree_rcu(presp, rcu_head);
 251
 252         sdata->drop_unencrypted = capability & WLAN_CAPABILITY_PRIVACY ? 1 : 0;
 253
 254         /* make a copy of the chandef, it could be modified below. */
 255         chandef = *req_chandef;
 256         chan = chandef.chan;
 257         if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef,
 258                                      NL80211_IFTYPE_ADHOC)) {
 259                 if (chandef.width == NL80211_CHAN_WIDTH_5 ||
 260                     chandef.width == NL80211_CHAN_WIDTH_10 ||
 261                     chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
 262                     chandef.width == NL80211_CHAN_WIDTH_20) {
 263                         sdata_info(sdata,
 264                                    "Failed to join IBSS, beacons forbidden\n");
 265                         return;
 266                 }
 267                 chandef.width = NL80211_CHAN_WIDTH_20;
 268                 chandef.center_freq1 = chan->center_freq;
 269                 /* check again for downgraded chandef */
 270                 if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef,
 271                                              NL80211_IFTYPE_ADHOC)) {
 272                         sdata_info(sdata,
 273                                    "Failed to join IBSS, beacons forbidden\n");
 274                         return;
 275                 }
 276         }
 277
 278         err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
 279                                             &chandef, NL80211_IFTYPE_ADHOC);
 280         if (err < 0) {
 281                 sdata_info(sdata,
 282                            "Failed to join IBSS, invalid chandef\n");
 283                 return;
 284         }
 285         if (err > 0 && !ifibss->userspace_handles_dfs) {
 286                 sdata_info(sdata,
 287                            "Failed to join IBSS, DFS channel without control program\n");
 288                 return;
 289         }
 290
 291         radar_required = err;
 292
 293         mutex_lock(&local->mtx);
 294         if (ieee80211_vif_use_channel(sdata, &chandef,
 295                                       ifibss->fixed_channel ?
 296                                         IEEE80211_CHANCTX_SHARED :
 297                                         IEEE80211_CHANCTX_EXCLUSIVE)) {
 298                 sdata_info(sdata, "Failed to join IBSS, no channel context\n");
 299                 mutex_unlock(&local->mtx);
 300                 return;
 301         }
 302         sdata->radar_required = radar_required;
 303         mutex_unlock(&local->mtx);
 304
 305         memcpy(ifibss->bssid, bssid, ETH_ALEN);
 306
 307         presp = ieee80211_ibss_build_presp(sdata, beacon_int, basic_rates,
 308                                            capability, tsf, &chandef,
 309                                            &have_higher_than_11mbit, NULL);
 310         if (!presp)
 311                 return;
 312
 313         rcu_assign_pointer(ifibss->presp, presp);
 314         mgmt = (void *)presp->head;
 315
 316         sdata->vif.bss_conf.enable_beacon = true;
 317         sdata->vif.bss_conf.beacon_int = beacon_int;
 318         sdata->vif.bss_conf.basic_rates = basic_rates;
 319         sdata->vif.bss_conf.ssid_len = ifibss->ssid_len;
 320         memcpy(sdata->vif.bss_conf.ssid, ifibss->ssid, ifibss->ssid_len);
 321         bss_change = BSS_CHANGED_BEACON_INT;
 322         bss_change |= ieee80211_reset_erp_info(sdata);
 323         bss_change |= BSS_CHANGED_BSSID;
 324         bss_change |= BSS_CHANGED_BEACON;
 325         bss_change |= BSS_CHANGED_BEACON_ENABLED;
 326         bss_change |= BSS_CHANGED_BASIC_RATES;
 327         bss_change |= BSS_CHANGED_HT;
 328         bss_change |= BSS_CHANGED_IBSS;
 329         bss_change |= BSS_CHANGED_SSID;
 330
 331         /*
 332          * In 5 GHz/802.11a, we can always use short slot time.
 333          * (IEEE 802.11-2012 18.3.8.7)
 334          *
 335          * In 2.4GHz, we must always use long slots in IBSS for compatibility
 336          * reasons.
 337          * (IEEE 802.11-2012 19.4.5)
 338          *
 339          * HT follows these specifications (IEEE 802.11-2012 20.3.18)
 340          */
 341         sdata->vif.bss_conf.use_short_slot = chan->band == IEEE80211_BAND_5GHZ;
 342         bss_change |= BSS_CHANGED_ERP_SLOT;
 343
 344         /* cf. IEEE 802.11 9.2.12 */
 345         if (chan->band == IEEE80211_BAND_2GHZ && have_higher_than_11mbit)
 346                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
 347         else
 348                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
 349
 350         ieee80211_set_wmm_default(sdata, true);
 351
 352         sdata->vif.bss_conf.ibss_joined = true;
 353         sdata->vif.bss_conf.ibss_creator = creator;
 354
 355         err = drv_join_ibss(local, sdata);
 356         if (err) {
 357                 sdata->vif.bss_conf.ibss_joined = false;
 358                 sdata->vif.bss_conf.ibss_creator = false;
 359                 sdata->vif.bss_conf.enable_beacon = false;
 360                 sdata->vif.bss_conf.ssid_len = 0;
 361                 RCU_INIT_POINTER(ifibss->presp, NULL);
 362                 kfree_rcu(presp, rcu_head);
 363                 mutex_lock(&local->mtx);
 364                 ieee80211_vif_release_channel(sdata);
 365                 mutex_unlock(&local->mtx);
 366                 sdata_info(sdata, "Failed to join IBSS, driver failure: %d\n",
 367                            err);
 368                 return;
 369         }
 370
 371         ieee80211_bss_info_change_notify(sdata, bss_change);
 372
 373         ifibss->state = IEEE80211_IBSS_MLME_JOINED;
 374         mod_timer(&ifibss->timer,
 375                   round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
 376
 377         scan_width = cfg80211_chandef_to_scan_width(&chandef);
 378         bss = cfg80211_inform_bss_width_frame(local->hw.wiphy, chan,
 379                                               scan_width, mgmt,
 380                                               presp->head_len, 0, GFP_KERNEL);
 381         cfg80211_put_bss(local->hw.wiphy, bss);
 382         netif_carrier_on(sdata->dev);
 383         cfg80211_ibss_joined(sdata->dev, ifibss->bssid, chan, GFP_KERNEL);
 384 }
 385
 386 static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
 387                                     struct ieee80211_bss *bss)
 388 {
 389         struct cfg80211_bss *cbss =
 390                 container_of((void *)bss, struct cfg80211_bss, priv);
 391         struct ieee80211_supported_band *sband;
 392         struct cfg80211_chan_def chandef;
 393         u32 basic_rates;
 394         int i, j;
 395         u16 beacon_int = cbss->beacon_interval;
 396         const struct cfg80211_bss_ies *ies;
 397         enum nl80211_channel_type chan_type;
 398         u64 tsf;
 399         u32 rate_flags;
 400         int shift;
 401
 402         sdata_assert_lock(sdata);
 403
 404         if (beacon_int < 10)
 405                 beacon_int = 10;
 406
 407         switch (sdata->u.ibss.chandef.width) {
 408         case NL80211_CHAN_WIDTH_20_NOHT:
 409         case NL80211_CHAN_WIDTH_20:
 410         case NL80211_CHAN_WIDTH_40:
 411                 chan_type = cfg80211_get_chandef_type(&sdata->u.ibss.chandef);
 412                 cfg80211_chandef_create(&chandef, cbss->channel, chan_type);
 413                 break;
 414         case NL80211_CHAN_WIDTH_5:
 415         case NL80211_CHAN_WIDTH_10:
 416                 cfg80211_chandef_create(&chandef, cbss->channel,
 417                                         NL80211_CHAN_WIDTH_20_NOHT);
 418                 chandef.width = sdata->u.ibss.chandef.width;
 419                 break;
 420         default:
 421                 /* fall back to 20 MHz for unsupported modes */
 422                 cfg80211_chandef_create(&chandef, cbss->channel,
 423                                         NL80211_CHAN_WIDTH_20_NOHT);
 424                 break;
 425         }
 426
 427         sband = sdata->local->hw.wiphy->bands[cbss->channel->band];
 428         rate_flags = ieee80211_chandef_rate_flags(&sdata->u.ibss.chandef);
 429         shift = ieee80211_vif_get_shift(&sdata->vif);
 430
 431         basic_rates = 0;
 432
 433         for (i = 0; i < bss->supp_rates_len; i++) {
 434                 int rate = bss->supp_rates[i] & 0x7f;
 435                 bool is_basic = !!(bss->supp_rates[i] & 0x80);
 436
 437                 for (j = 0; j < sband->n_bitrates; j++) {
 438                         int brate;
 439                         if ((rate_flags & sband->bitrates[j].flags)
 440                             != rate_flags)
 441                                 continue;
 442
 443                         brate = DIV_ROUND_UP(sband->bitrates[j].bitrate,
 444                                              5 * (1 << shift));
 445                         if (brate == rate) {
 446                                 if (is_basic)
 447                                         basic_rates |= BIT(j);
 448                                 break;
 449                         }
 450                 }
 451         }
 452
 453         rcu_read_lock();
 454         ies = rcu_dereference(cbss->ies);
 455         tsf = ies->tsf;
 456         rcu_read_unlock();
 457
 458         __ieee80211_sta_join_ibss(sdata, cbss->bssid,
 459                                   beacon_int,
 460                                   &chandef,
 461                                   basic_rates,
 462                                   cbss->capability,
 463                                   tsf, false);
 464 }
 465
 466 int ieee80211_ibss_csa_beacon(struct ieee80211_sub_if_data *sdata,
 467                               struct cfg80211_csa_settings *csa_settings)
 468 {
 469         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 470         struct beacon_data *presp, *old_presp;
 471         struct cfg80211_bss *cbss;
 472         const struct cfg80211_bss_ies *ies;
 473         u16 capability;
 474         u64 tsf;
 475         int ret = 0;
 476
 477         sdata_assert_lock(sdata);
 478
 479         capability = WLAN_CAPABILITY_IBSS;
 480
 481         if (ifibss->privacy)
 482                 capability |= WLAN_CAPABILITY_PRIVACY;
 483
 484         cbss = cfg80211_get_bss(sdata->local->hw.wiphy, ifibss->chandef.chan,
 485                                 ifibss->bssid, ifibss->ssid,
 486                                 ifibss->ssid_len, WLAN_CAPABILITY_IBSS |
 487                                 WLAN_CAPABILITY_PRIVACY,
 488                                 capability);
 489
 490         if (WARN_ON(!cbss)) {
 491                 ret = -EINVAL;
 492                 goto out;
 493         }
 494
 495         rcu_read_lock();
 496         ies = rcu_dereference(cbss->ies);
 497         tsf = ies->tsf;
 498         rcu_read_unlock();
 499         cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
 500
 501         old_presp = rcu_dereference_protected(ifibss->presp,
 502                                           lockdep_is_held(&sdata->wdev.mtx));
 503
 504         presp = ieee80211_ibss_build_presp(sdata,
 505                                            sdata->vif.bss_conf.beacon_int,
 506                                            sdata->vif.bss_conf.basic_rates,
 507                                            capability, tsf, &ifibss->chandef,
 508                                            NULL, csa_settings);
 509         if (!presp) {
 510                 ret = -ENOMEM;
 511                 goto out;
 512         }
 513
 514         rcu_assign_pointer(ifibss->presp, presp);
 515         if (old_presp)
 516                 kfree_rcu(old_presp, rcu_head);
 517
 518         return BSS_CHANGED_BEACON;
 519  out:
 520         return ret;
 521 }
 522
 523 int ieee80211_ibss_finish_csa(struct ieee80211_sub_if_data *sdata)
 524 {
 525         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 526         struct cfg80211_bss *cbss;
 527         int err, changed = 0;
 528         u16 capability;
 529
 530         sdata_assert_lock(sdata);
 531
 532         /* update cfg80211 bss information with the new channel */
 533         if (!is_zero_ether_addr(ifibss->bssid)) {
 534                 capability = WLAN_CAPABILITY_IBSS;
 535
 536                 if (ifibss->privacy)
 537                         capability |= WLAN_CAPABILITY_PRIVACY;
 538
 539                 cbss = cfg80211_get_bss(sdata->local->hw.wiphy,
 540                                         ifibss->chandef.chan,
 541                                         ifibss->bssid, ifibss->ssid,
 542                                         ifibss->ssid_len, WLAN_CAPABILITY_IBSS |
 543                                         WLAN_CAPABILITY_PRIVACY,
 544                                         capability);
 545                 /* XXX: should not really modify cfg80211 data */
 546                 if (cbss) {
 547                         cbss->channel = sdata->csa_chandef.chan;
 548                         cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
 549                 }
 550         }
 551
 552         ifibss->chandef = sdata->csa_chandef;
 553
 554         /* generate the beacon */
 555         err = ieee80211_ibss_csa_beacon(sdata, NULL);
 556         if (err < 0)
 557                 return err;
 558
 559         changed |= err;
 560
 561         return changed;
 562 }
 563
 564 void ieee80211_ibss_stop(struct ieee80211_sub_if_data *sdata)
 565 {
 566         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 567
 568         cancel_work_sync(&ifibss->csa_connection_drop_work);
 569 }
 570
 571 static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta)
 572         __acquires(RCU)
 573 {
 574         struct ieee80211_sub_if_data *sdata = sta->sdata;
 575         u8 addr[ETH_ALEN];
 576
 577         memcpy(addr, sta->sta.addr, ETH_ALEN);
 578
 579         ibss_dbg(sdata, "Adding new IBSS station %pM\n", addr);
 580
 581         sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
 582         sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
 583         /* authorize the station only if the network is not RSN protected. If
 584          * not wait for the userspace to authorize it */
 585         if (!sta->sdata->u.ibss.control_port)
 586                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
 587
 588         rate_control_rate_init(sta);
 589
 590         /* If it fails, maybe we raced another insertion? */
 591         if (sta_info_insert_rcu(sta))
 592                 return sta_info_get(sdata, addr);
 593         return sta;
 594 }
 595
 596 static struct sta_info *
 597 ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, const u8 *bssid,
 598                        const u8 *addr, u32 supp_rates)
 599         __acquires(RCU)
 600 {
 601         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 602         struct ieee80211_local *local = sdata->local;
 603         struct sta_info *sta;
 604         struct ieee80211_chanctx_conf *chanctx_conf;
 605         struct ieee80211_supported_band *sband;
 606         enum nl80211_bss_scan_width scan_width;
 607         int band;
 608
 609         /*
 610          * XXX: Consider removing the least recently used entry and
 611          *      allow new one to be added.
 612          */
 613         if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
 614                 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
 615                                     sdata->name, addr);
 616                 rcu_read_lock();
 617                 return NULL;
 618         }
 619
 620         if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) {
 621                 rcu_read_lock();
 622                 return NULL;
 623         }
 624
 625         if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) {
 626                 rcu_read_lock();
 627                 return NULL;
 628         }
 629
 630         rcu_read_lock();
 631         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 632         if (WARN_ON_ONCE(!chanctx_conf))
 633                 return NULL;
 634         band = chanctx_conf->def.chan->band;
 635         scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
 636         rcu_read_unlock();
 637
 638         sta = sta_info_alloc(sdata, addr, GFP_KERNEL);
 639         if (!sta) {
 640                 rcu_read_lock();
 641                 return NULL;
 642         }
 643
 644         sta->last_rx = jiffies;
 645
 646         /* make sure mandatory rates are always added */
 647         sband = local->hw.wiphy->bands[band];
 648         sta->sta.supp_rates[band] = supp_rates |
 649                         ieee80211_mandatory_rates(sband, scan_width);
 650
 651         return ieee80211_ibss_finish_sta(sta);
 652 }
 653
 654 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
 655 {
 656         struct ieee80211_local *local = sdata->local;
 657         int active = 0;
 658         struct sta_info *sta;
 659
 660         sdata_assert_lock(sdata);
 661
 662         rcu_read_lock();
 663
 664         list_for_each_entry_rcu(sta, &local->sta_list, list) {
 665                 if (sta->sdata == sdata &&
 666                     time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
 667                                jiffies)) {
 668                         active++;
 669                         break;
 670                 }
 671         }
 672
 673         rcu_read_unlock();
 674
 675         return active;
 676 }
 677
 678 static void ieee80211_ibss_disconnect(struct ieee80211_sub_if_data *sdata)
 679 {
 680         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 681         struct ieee80211_local *local = sdata->local;
 682         struct cfg80211_bss *cbss;
 683         struct beacon_data *presp;
 684         struct sta_info *sta;
 685         u16 capability;
 686
 687         if (!is_zero_ether_addr(ifibss->bssid)) {
 688                 capability = WLAN_CAPABILITY_IBSS;
 689
 690                 if (ifibss->privacy)
 691                         capability |= WLAN_CAPABILITY_PRIVACY;
 692
 693                 cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->chandef.chan,
 694                                         ifibss->bssid, ifibss->ssid,
 695                                         ifibss->ssid_len, WLAN_CAPABILITY_IBSS |
 696                                         WLAN_CAPABILITY_PRIVACY,
 697                                         capability);
 698
 699                 if (cbss) {
 700                         cfg80211_unlink_bss(local->hw.wiphy, cbss);
 701                         cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
 702                 }
 703         }
 704
 705         ifibss->state = IEEE80211_IBSS_MLME_SEARCH;
 706
 707         sta_info_flush(sdata);
 708
 709         spin_lock_bh(&ifibss->incomplete_lock);
 710         while (!list_empty(&ifibss->incomplete_stations)) {
 711                 sta = list_first_entry(&ifibss->incomplete_stations,
 712                                        struct sta_info, list);
 713                 list_del(&sta->list);
 714                 spin_unlock_bh(&ifibss->incomplete_lock);
 715
 716                 sta_info_free(local, sta);
 717                 spin_lock_bh(&ifibss->incomplete_lock);
 718         }
 719         spin_unlock_bh(&ifibss->incomplete_lock);
 720
 721         netif_carrier_off(sdata->dev);
 722
 723         sdata->vif.bss_conf.ibss_joined = false;
 724         sdata->vif.bss_conf.ibss_creator = false;
 725         sdata->vif.bss_conf.enable_beacon = false;
 726         sdata->vif.bss_conf.ssid_len = 0;
 727
 728         /* remove beacon */
 729         presp = rcu_dereference_protected(ifibss->presp,
 730                                           lockdep_is_held(&sdata->wdev.mtx));
 731         RCU_INIT_POINTER(sdata->u.ibss.presp, NULL);
 732         if (presp)
 733                 kfree_rcu(presp, rcu_head);
 734
 735         clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state);
 736         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED |
 737                                                 BSS_CHANGED_IBSS);
 738         drv_leave_ibss(local, sdata);
 739         mutex_lock(&local->mtx);
 740         ieee80211_vif_release_channel(sdata);
 741         mutex_unlock(&local->mtx);
 742 }
 743
 744 static void ieee80211_csa_connection_drop_work(struct work_struct *work)
 745 {
 746         struct ieee80211_sub_if_data *sdata =
 747                 container_of(work, struct ieee80211_sub_if_data,
 748                              u.ibss.csa_connection_drop_work);
 749
 750         sdata_lock(sdata);
 751
 752         ieee80211_ibss_disconnect(sdata);
 753         synchronize_rcu();
 754         skb_queue_purge(&sdata->skb_queue);
 755
 756         /* trigger a scan to find another IBSS network to join */
 757         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
 758
 759         sdata_unlock(sdata);
 760 }
 761
 762 static void ieee80211_ibss_csa_mark_radar(struct ieee80211_sub_if_data *sdata)
 763 {
 764         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 765         int err;
 766
 767         /* if the current channel is a DFS channel, mark the channel as
 768          * unavailable.
 769          */
 770         err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
 771                                             &ifibss->chandef,
 772                                             NL80211_IFTYPE_ADHOC);
 773         if (err > 0)
 774                 cfg80211_radar_event(sdata->local->hw.wiphy, &ifibss->chandef,
 775                                      GFP_ATOMIC);
 776 }
 777
 778 static bool
 779 ieee80211_ibss_process_chanswitch(struct ieee80211_sub_if_data *sdata,
 780                                   struct ieee802_11_elems *elems,
 781                                   bool beacon)
 782 {
 783         struct cfg80211_csa_settings params;
 784         struct ieee80211_csa_ie csa_ie;
 785         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 786         enum nl80211_channel_type ch_type;
 787         int err;
 788         u32 sta_flags;
 789
 790         sdata_assert_lock(sdata);
 791
 792         sta_flags = IEEE80211_STA_DISABLE_VHT;
 793         switch (ifibss->chandef.width) {
 794         case NL80211_CHAN_WIDTH_5:
 795         case NL80211_CHAN_WIDTH_10:
 796         case NL80211_CHAN_WIDTH_20_NOHT:
 797                 sta_flags |= IEEE80211_STA_DISABLE_HT;
 798                 /* fall through */
 799         case NL80211_CHAN_WIDTH_20:
 800                 sta_flags |= IEEE80211_STA_DISABLE_40MHZ;
 801                 break;
 802         default:
 803                 break;
 804         }
 805
 806         memset(&params, 0, sizeof(params));
 807         memset(&csa_ie, 0, sizeof(csa_ie));
 808         err = ieee80211_parse_ch_switch_ie(sdata, elems,
 809                                            ifibss->chandef.chan->band,
 810                                            sta_flags, ifibss->bssid, &csa_ie);
 811         /* can't switch to destination channel, fail */
 812         if (err < 0)
 813                 goto disconnect;
 814
 815         /* did not contain a CSA */
 816         if (err)
 817                 return false;
 818
 819         /* channel switch is not supported, disconnect */
 820         if (!(sdata->local->hw.wiphy->flags & WIPHY_FLAG_HAS_CHANNEL_SWITCH))
 821                 goto disconnect;
 822
 823         params.count = csa_ie.count;
 824         params.chandef = csa_ie.chandef;
 825
 826         switch (ifibss->chandef.width) {
 827         case NL80211_CHAN_WIDTH_20_NOHT:
 828         case NL80211_CHAN_WIDTH_20:
 829         case NL80211_CHAN_WIDTH_40:
 830                 /* keep our current HT mode (HT20/HT40+/HT40-), even if
 831                  * another mode  has been announced. The mode is not adopted
 832                  * within the beacon while doing CSA and we should therefore
 833                  * keep the mode which we announce.
 834                  */
 835                 ch_type = cfg80211_get_chandef_type(&ifibss->chandef);
 836                 cfg80211_chandef_create(&params.chandef, params.chandef.chan,
 837                                         ch_type);
 838                 break;
 839         case NL80211_CHAN_WIDTH_5:
 840         case NL80211_CHAN_WIDTH_10:
 841                 if (params.chandef.width != ifibss->chandef.width) {
 842                         sdata_info(sdata,
 843                                    "IBSS %pM received channel switch from incompatible channel width (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
 844                                    ifibss->bssid,
 845                                    params.chandef.chan->center_freq,
 846                                    params.chandef.width,
 847                                    params.chandef.center_freq1,
 848                                    params.chandef.center_freq2);
 849                         goto disconnect;
 850                 }
 851                 break;
 852         default:
 853                 /* should not happen, sta_flags should prevent VHT modes. */
 854                 WARN_ON(1);
 855                 goto disconnect;
 856         }
 857
 858         if (!cfg80211_reg_can_beacon(sdata->local->hw.wiphy, &params.chandef,
 859                                      NL80211_IFTYPE_ADHOC)) {
 860                 sdata_info(sdata,
 861                            "IBSS %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
 862                            ifibss->bssid,
 863                            params.chandef.chan->center_freq,
 864                            params.chandef.width,
 865                            params.chandef.center_freq1,
 866                            params.chandef.center_freq2);
 867                 goto disconnect;
 868         }
 869
 870         err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
 871                                             &params.chandef,
 872                                             NL80211_IFTYPE_ADHOC);
 873         if (err < 0)
 874                 goto disconnect;
 875         if (err > 0 && !ifibss->userspace_handles_dfs) {
 876                 /* IBSS-DFS only allowed with a control program */
 877                 goto disconnect;
 878         }
 879
 880         params.radar_required = err;
 881
 882         if (cfg80211_chandef_identical(&params.chandef,
 883                                        &sdata->vif.bss_conf.chandef)) {
 884                 ibss_dbg(sdata,
 885                          "received csa with an identical chandef, ignoring\n");
 886                 return true;
 887         }
 888
 889         /* all checks done, now perform the channel switch. */
 890         ibss_dbg(sdata,
 891                  "received channel switch announcement to go to channel %d MHz\n",
 892                  params.chandef.chan->center_freq);
 893
 894         params.block_tx = !!csa_ie.mode;
 895
 896         if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev,
 897                                      &params))
 898                 goto disconnect;
 899
 900         ieee80211_ibss_csa_mark_radar(sdata);
 901
 902         return true;
 903 disconnect:
 904         ibss_dbg(sdata, "Can't handle channel switch, disconnect\n");
 905         ieee80211_queue_work(&sdata->local->hw,
 906                              &ifibss->csa_connection_drop_work);
 907
 908         ieee80211_ibss_csa_mark_radar(sdata);
 909
 910         return true;
 911 }
 912
 913 static void
 914 ieee80211_rx_mgmt_spectrum_mgmt(struct ieee80211_sub_if_data *sdata,
 915                                 struct ieee80211_mgmt *mgmt, size_t len,
 916                                 struct ieee80211_rx_status *rx_status,
 917                                 struct ieee802_11_elems *elems)
 918 {
 919         int required_len;
 920
 921         if (len < IEEE80211_MIN_ACTION_SIZE + 1)
 922                 return;
 923
 924         /* CSA is the only action we handle for now */
 925         if (mgmt->u.action.u.measurement.action_code !=
 926             WLAN_ACTION_SPCT_CHL_SWITCH)
 927                 return;
 928
 929         required_len = IEEE80211_MIN_ACTION_SIZE +
 930                        sizeof(mgmt->u.action.u.chan_switch);
 931         if (len < required_len)
 932                 return;
 933
 934         if (!sdata->vif.csa_active)
 935                 ieee80211_ibss_process_chanswitch(sdata, elems, false);
 936 }
 937
 938 static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data *sdata,
 939                                           struct ieee80211_mgmt *mgmt,
 940                                           size_t len)
 941 {
 942         u16 reason = le16_to_cpu(mgmt->u.deauth.reason_code);
 943
 944         if (len < IEEE80211_DEAUTH_FRAME_LEN)
 945                 return;
 946
 947         ibss_dbg(sdata, "RX DeAuth SA=%pM DA=%pM BSSID=%pM (reason: %d)\n",
 948                  mgmt->sa, mgmt->da, mgmt->bssid, reason);
 949         sta_info_destroy_addr(sdata, mgmt->sa);
 950 }
 951
 952 static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata,
 953                                         struct ieee80211_mgmt *mgmt,
 954                                         size_t len)
 955 {
 956         u16 auth_alg, auth_transaction;
 957
 958         sdata_assert_lock(sdata);
 959
 960         if (len < 24 + 6)
 961                 return;
 962
 963         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
 964         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
 965
 966         ibss_dbg(sdata,
 967                  "RX Auth SA=%pM DA=%pM BSSID=%pM (auth_transaction=%d)\n",
 968                  mgmt->sa, mgmt->da, mgmt->bssid, auth_transaction);
 969
 970         if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
 971                 return;
 972
 973         /*
 974          * IEEE 802.11 standard does not require authentication in IBSS
 975          * networks and most implementations do not seem to use it.
 976          * However, try to reply to authentication attempts if someone
 977          * has actually implemented this.
 978          */
 979         ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, 0, NULL, 0,
 980                             mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0, 0);
 981 }
 982
 983 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
 984                                   struct ieee80211_mgmt *mgmt, size_t len,
 985                                   struct ieee80211_rx_status *rx_status,
 986                                   struct ieee802_11_elems *elems)
 987 {
 988         struct ieee80211_local *local = sdata->local;
 989         struct cfg80211_bss *cbss;
 990         struct ieee80211_bss *bss;
 991         struct sta_info *sta;
 992         struct ieee80211_channel *channel;
 993         u64 beacon_timestamp, rx_timestamp;
 994         u32 supp_rates = 0;
 995         enum ieee80211_band band = rx_status->band;
 996         enum nl80211_bss_scan_width scan_width;
 997         struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band];
 998         bool rates_updated = false;
 999
1000         channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
1001         if (!channel)
1002                 return;
1003
1004         if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
1005             ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid)) {
1006
1007                 rcu_read_lock();
1008                 sta = sta_info_get(sdata, mgmt->sa);
1009
1010                 if (elems->supp_rates) {
1011                         supp_rates = ieee80211_sta_get_rates(sdata, elems,
1012                                                              band, NULL);
1013                         if (sta) {
1014                                 u32 prev_rates;
1015
1016                                 prev_rates = sta->sta.supp_rates[band];
1017                                 /* make sure mandatory rates are always added */
1018                                 scan_width = NL80211_BSS_CHAN_WIDTH_20;
1019                                 if (rx_status->flag & RX_FLAG_5MHZ)
1020                                         scan_width = NL80211_BSS_CHAN_WIDTH_5;
1021                                 if (rx_status->flag & RX_FLAG_10MHZ)
1022                                         scan_width = NL80211_BSS_CHAN_WIDTH_10;
1023
1024                                 sta->sta.supp_rates[band] = supp_rates |
1025                                         ieee80211_mandatory_rates(sband,
1026                                                                   scan_width);
1027                                 if (sta->sta.supp_rates[band] != prev_rates) {
1028                                         ibss_dbg(sdata,
1029                                                  "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n",
1030                                                  sta->sta.addr, prev_rates,
1031                                                  sta->sta.supp_rates[band]);
1032                                         rates_updated = true;
1033                                 }
1034                         } else {
1035                                 rcu_read_unlock();
1036                                 sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid,
1037                                                 mgmt->sa, supp_rates);
1038                         }
1039                 }
1040
1041                 if (sta && elems->wmm_info)
1042                         sta->sta.wme = true;
1043
1044                 if (sta && elems->ht_operation && elems->ht_cap_elem &&
1045                     sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20_NOHT &&
1046                     sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_5 &&
1047                     sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_10) {
1048                         /* we both use HT */
1049                         struct ieee80211_ht_cap htcap_ie;
1050                         struct cfg80211_chan_def chandef;
1051
1052                         ieee80211_ht_oper_to_chandef(channel,
1053                                                      elems->ht_operation,
1054                                                      &chandef);
1055
1056                         memcpy(&htcap_ie, elems->ht_cap_elem, sizeof(htcap_ie));
1057
1058                         /*
1059                          * fall back to HT20 if we don't use or use
1060                          * the other extension channel
1061                          */
1062                         if (chandef.center_freq1 !=
1063                             sdata->u.ibss.chandef.center_freq1)
1064                                 htcap_ie.cap_info &=
1065                                         cpu_to_le16(~IEEE80211_HT_CAP_SUP_WIDTH_20_40);
1066
1067                         rates_updated |= ieee80211_ht_cap_ie_to_sta_ht_cap(
1068                                                 sdata, sband, &htcap_ie, sta);
1069                 }
1070
1071                 if (sta && rates_updated) {
1072                         drv_sta_rc_update(local, sdata, &sta->sta,
1073                                           IEEE80211_RC_SUPP_RATES_CHANGED);
1074                         rate_control_rate_init(sta);
1075                 }
1076
1077                 rcu_read_unlock();
1078         }
1079
1080         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1081                                         channel);
1082         if (!bss)
1083                 return;
1084
1085         cbss = container_of((void *)bss, struct cfg80211_bss, priv);
1086
1087         /* same for beacon and probe response */
1088         beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp);
1089
1090         /* check if we need to merge IBSS */
1091
1092         /* not an IBSS */
1093         if (!(cbss->capability & WLAN_CAPABILITY_IBSS))
1094                 goto put_bss;
1095
1096         /* different channel */
1097         if (sdata->u.ibss.fixed_channel &&
1098             sdata->u.ibss.chandef.chan != cbss->channel)
1099                 goto put_bss;
1100
1101         /* different SSID */
1102         if (elems->ssid_len != sdata->u.ibss.ssid_len ||
1103             memcmp(elems->ssid, sdata->u.ibss.ssid,
1104                                 sdata->u.ibss.ssid_len))
1105                 goto put_bss;
1106
1107         /* process channel switch */
1108         if (sdata->vif.csa_active ||
1109             ieee80211_ibss_process_chanswitch(sdata, elems, true))
1110                 goto put_bss;
1111
1112         /* same BSSID */
1113         if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid))
1114                 goto put_bss;
1115
1116         /* we use a fixed BSSID */
1117         if (sdata->u.ibss.fixed_bssid)
1118                 goto put_bss;
1119
1120         if (ieee80211_have_rx_timestamp(rx_status)) {
1121                 /* time when timestamp field was received */
1122                 rx_timestamp =
1123                         ieee80211_calculate_rx_timestamp(local, rx_status,
1124                                                          len + FCS_LEN, 24);
1125         } else {
1126                 /*
1127                  * second best option: get current TSF
1128                  * (will return -1 if not supported)
1129                  */
1130                 rx_timestamp = drv_get_tsf(local, sdata);
1131         }
1132
1133         ibss_dbg(sdata,
1134                  "RX beacon SA=%pM BSSID=%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
1135                  mgmt->sa, mgmt->bssid,
1136                  (unsigned long long)rx_timestamp,
1137                  (unsigned long long)beacon_timestamp,
1138                  (unsigned long long)(rx_timestamp - beacon_timestamp),
1139                  jiffies);
1140
1141         if (beacon_timestamp > rx_timestamp) {
1142                 ibss_dbg(sdata,
1143                          "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n",
1144                          mgmt->bssid);
1145                 ieee80211_sta_join_ibss(sdata, bss);
1146                 supp_rates = ieee80211_sta_get_rates(sdata, elems, band, NULL);
1147                 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa,
1148                                        supp_rates);
1149                 rcu_read_unlock();
1150         }
1151
1152  put_bss:
1153         ieee80211_rx_bss_put(local, bss);
1154 }
1155
1156 void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata,
1157                               const u8 *bssid, const u8 *addr,
1158                               u32 supp_rates)
1159 {
1160         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1161         struct ieee80211_local *local = sdata->local;
1162         struct sta_info *sta;
1163         struct ieee80211_chanctx_conf *chanctx_conf;
1164         struct ieee80211_supported_band *sband;
1165         enum nl80211_bss_scan_width scan_width;
1166         int band;
1167
1168         /*
1169          * XXX: Consider removing the least recently used entry and
1170          *      allow new one to be added.
1171          */
1172         if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
1173                 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
1174                                     sdata->name, addr);
1175                 return;
1176         }
1177
1178         if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH)
1179                 return;
1180
1181         if (!ether_addr_equal(bssid, sdata->u.ibss.bssid))
1182                 return;
1183
1184         rcu_read_lock();
1185         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1186         if (WARN_ON_ONCE(!chanctx_conf)) {
1187                 rcu_read_unlock();
1188                 return;
1189         }
1190         band = chanctx_conf->def.chan->band;
1191         scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
1192         rcu_read_unlock();
1193
1194         sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
1195         if (!sta)
1196                 return;
1197
1198         sta->last_rx = jiffies;
1199
1200         /* make sure mandatory rates are always added */
1201         sband = local->hw.wiphy->bands[band];
1202         sta->sta.supp_rates[band] = supp_rates |
1203                         ieee80211_mandatory_rates(sband, scan_width);
1204
1205         spin_lock(&ifibss->incomplete_lock);
1206         list_add(&sta->list, &ifibss->incomplete_stations);
1207         spin_unlock(&ifibss->incomplete_lock);
1208         ieee80211_queue_work(&local->hw, &sdata->work);
1209 }
1210
1211 static void ieee80211_ibss_sta_expire(struct ieee80211_sub_if_data *sdata)
1212 {
1213         struct ieee80211_local *local = sdata->local;
1214         struct sta_info *sta, *tmp;
1215         unsigned long exp_time = IEEE80211_IBSS_INACTIVITY_LIMIT;
1216         unsigned long exp_rsn_time = IEEE80211_IBSS_RSN_INACTIVITY_LIMIT;
1217
1218         mutex_lock(&local->sta_mtx);
1219
1220         list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
1221                 if (sdata != sta->sdata)
1222                         continue;
1223
1224                 if (time_after(jiffies, sta->last_rx + exp_time) ||
1225                     (time_after(jiffies, sta->last_rx + exp_rsn_time) &&
1226                      sta->sta_state != IEEE80211_STA_AUTHORIZED)) {
1227                         sta_dbg(sta->sdata, "expiring inactive %sSTA %pM\n",
1228                                 sta->sta_state != IEEE80211_STA_AUTHORIZED ?
1229                                 "not authorized " : "", sta->sta.addr);
1230
1231                         WARN_ON(__sta_info_destroy(sta));
1232                 }
1233         }
1234
1235         mutex_unlock(&local->sta_mtx);
1236 }
1237
1238 /*
1239  * This function is called with state == IEEE80211_IBSS_MLME_JOINED
1240  */
1241
1242 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
1243 {
1244         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1245         enum nl80211_bss_scan_width scan_width;
1246
1247         sdata_assert_lock(sdata);
1248
1249         mod_timer(&ifibss->timer,
1250                   round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
1251
1252         ieee80211_ibss_sta_expire(sdata);
1253
1254         if (time_before(jiffies, ifibss->last_scan_completed +
1255                        IEEE80211_IBSS_MERGE_INTERVAL))
1256                 return;
1257
1258         if (ieee80211_sta_active_ibss(sdata))
1259                 return;
1260
1261         if (ifibss->fixed_channel)
1262                 return;
1263
1264         sdata_info(sdata,
1265                    "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n");
1266
1267         scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
1268         ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len,
1269                                     NULL, scan_width);
1270 }
1271
1272 static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
1273 {
1274         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1275         u8 bssid[ETH_ALEN];
1276         u16 capability;
1277         int i;
1278
1279         sdata_assert_lock(sdata);
1280
1281         if (ifibss->fixed_bssid) {
1282                 memcpy(bssid, ifibss->bssid, ETH_ALEN);
1283         } else {
1284                 /* Generate random, not broadcast, locally administered BSSID. Mix in
1285                  * own MAC address to make sure that devices that do not have proper
1286                  * random number generator get different BSSID. */
1287                 get_random_bytes(bssid, ETH_ALEN);
1288                 for (i = 0; i < ETH_ALEN; i++)
1289                         bssid[i] ^= sdata->vif.addr[i];
1290                 bssid[0] &= ~0x01;
1291                 bssid[0] |= 0x02;
1292         }
1293
1294         sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid);
1295
1296         capability = WLAN_CAPABILITY_IBSS;
1297
1298         if (ifibss->privacy)
1299                 capability |= WLAN_CAPABILITY_PRIVACY;
1300         else
1301                 sdata->drop_unencrypted = 0;
1302
1303         __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int,
1304                                   &ifibss->chandef, ifibss->basic_rates,
1305                                   capability, 0, true);
1306 }
1307
1308 /*
1309  * This function is called with state == IEEE80211_IBSS_MLME_SEARCH
1310  */
1311
1312 static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
1313 {
1314         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1315         struct ieee80211_local *local = sdata->local;
1316         struct cfg80211_bss *cbss;
1317         struct ieee80211_channel *chan = NULL;
1318         const u8 *bssid = NULL;
1319         enum nl80211_bss_scan_width scan_width;
1320         int active_ibss;
1321         u16 capability;
1322
1323         sdata_assert_lock(sdata);
1324
1325         active_ibss = ieee80211_sta_active_ibss(sdata);
1326         ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss);
1327
1328         if (active_ibss)
1329                 return;
1330
1331         capability = WLAN_CAPABILITY_IBSS;
1332         if (ifibss->privacy)
1333                 capability |= WLAN_CAPABILITY_PRIVACY;
1334         if (ifibss->fixed_bssid)
1335                 bssid = ifibss->bssid;
1336         if (ifibss->fixed_channel)
1337                 chan = ifibss->chandef.chan;
1338         if (!is_zero_ether_addr(ifibss->bssid))
1339                 bssid = ifibss->bssid;
1340         cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid,
1341                                 ifibss->ssid, ifibss->ssid_len,
1342                                 WLAN_CAPABILITY_IBSS | WLAN_CAPABILITY_PRIVACY,
1343                                 capability);
1344
1345         if (cbss) {
1346                 struct ieee80211_bss *bss;
1347
1348                 bss = (void *)cbss->priv;
1349                 ibss_dbg(sdata,
1350                          "sta_find_ibss: selected %pM current %pM\n",
1351                          cbss->bssid, ifibss->bssid);
1352                 sdata_info(sdata,
1353                            "Selected IBSS BSSID %pM based on configured SSID\n",
1354                            cbss->bssid);
1355
1356                 ieee80211_sta_join_ibss(sdata, bss);
1357                 ieee80211_rx_bss_put(local, bss);
1358                 return;
1359         }
1360
1361         /* if a fixed bssid and a fixed freq have been provided create the IBSS
1362          * directly and do not waste time scanning
1363          */
1364         if (ifibss->fixed_bssid && ifibss->fixed_channel) {
1365                 sdata_info(sdata, "Created IBSS using preconfigured BSSID %pM\n",
1366                            bssid);
1367                 ieee80211_sta_create_ibss(sdata);
1368                 return;
1369         }
1370
1371
1372         ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n");
1373
1374         /* Selected IBSS not found in current scan results - try to scan */
1375         if (time_after(jiffies, ifibss->last_scan_completed +
1376                                         IEEE80211_SCAN_INTERVAL)) {
1377                 sdata_info(sdata, "Trigger new scan to find an IBSS to join\n");
1378
1379                 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
1380                 ieee80211_request_ibss_scan(sdata, ifibss->ssid,
1381                                             ifibss->ssid_len, chan,
1382                                             scan_width);
1383         } else {
1384                 int interval = IEEE80211_SCAN_INTERVAL;
1385
1386                 if (time_after(jiffies, ifibss->ibss_join_req +
1387                                IEEE80211_IBSS_JOIN_TIMEOUT))
1388                         ieee80211_sta_create_ibss(sdata);
1389
1390                 mod_timer(&ifibss->timer,
1391                           round_jiffies(jiffies + interval));
1392         }
1393 }
1394
1395 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
1396                                         struct sk_buff *req)
1397 {
1398         struct ieee80211_mgmt *mgmt = (void *)req->data;
1399         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1400         struct ieee80211_local *local = sdata->local;
1401         int tx_last_beacon, len = req->len;
1402         struct sk_buff *skb;
1403         struct beacon_data *presp;
1404         u8 *pos, *end;
1405
1406         sdata_assert_lock(sdata);
1407
1408         presp = rcu_dereference_protected(ifibss->presp,
1409                                           lockdep_is_held(&sdata->wdev.mtx));
1410
1411         if (ifibss->state != IEEE80211_IBSS_MLME_JOINED ||
1412             len < 24 + 2 || !presp)
1413                 return;
1414
1415         tx_last_beacon = drv_tx_last_beacon(local);
1416
1417         ibss_dbg(sdata,
1418                  "RX ProbeReq SA=%pM DA=%pM BSSID=%pM (tx_last_beacon=%d)\n",
1419                  mgmt->sa, mgmt->da, mgmt->bssid, tx_last_beacon);
1420
1421         if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da))
1422                 return;
1423
1424         if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) &&
1425             !is_broadcast_ether_addr(mgmt->bssid))
1426                 return;
1427
1428         end = ((u8 *) mgmt) + len;
1429         pos = mgmt->u.probe_req.variable;
1430         if (pos[0] != WLAN_EID_SSID ||
1431             pos + 2 + pos[1] > end) {
1432                 ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n",
1433                          mgmt->sa);
1434                 return;
1435         }
1436         if (pos[1] != 0 &&
1437             (pos[1] != ifibss->ssid_len ||
1438              memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) {
1439                 /* Ignore ProbeReq for foreign SSID */
1440                 return;
1441         }
1442
1443         /* Reply with ProbeResp */
1444         skb = dev_alloc_skb(local->tx_headroom + presp->head_len);
1445         if (!skb)
1446                 return;
1447
1448         skb_reserve(skb, local->tx_headroom);
1449         memcpy(skb_put(skb, presp->head_len), presp->head, presp->head_len);
1450
1451         memcpy(((struct ieee80211_mgmt *) skb->data)->da, mgmt->sa, ETH_ALEN);
1452         ibss_dbg(sdata, "Sending ProbeResp to %pM\n", mgmt->sa);
1453         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1454
1455         /* avoid excessive retries for probe request to wildcard SSIDs */
1456         if (pos[1] == 0)
1457                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_NO_ACK;
1458
1459         ieee80211_tx_skb(sdata, skb);
1460 }
1461
1462 static
1463 void ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data *sdata,
1464                                     struct ieee80211_mgmt *mgmt, size_t len,
1465                                     struct ieee80211_rx_status *rx_status)
1466 {
1467         size_t baselen;
1468         struct ieee802_11_elems elems;
1469
1470         BUILD_BUG_ON(offsetof(typeof(mgmt->u.probe_resp), variable) !=
1471                      offsetof(typeof(mgmt->u.beacon), variable));
1472
1473         /*
1474          * either beacon or probe_resp but the variable field is at the
1475          * same offset
1476          */
1477         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1478         if (baselen > len)
1479                 return;
1480
1481         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1482                                false, &elems);
1483
1484         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
1485 }
1486
1487 void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1488                                    struct sk_buff *skb)
1489 {
1490         struct ieee80211_rx_status *rx_status;
1491         struct ieee80211_mgmt *mgmt;
1492         u16 fc;
1493         struct ieee802_11_elems elems;
1494         int ies_len;
1495
1496         rx_status = IEEE80211_SKB_RXCB(skb);
1497         mgmt = (struct ieee80211_mgmt *) skb->data;
1498         fc = le16_to_cpu(mgmt->frame_control);
1499
1500         sdata_lock(sdata);
1501
1502         if (!sdata->u.ibss.ssid_len)
1503                 goto mgmt_out; /* not ready to merge yet */
1504
1505         switch (fc & IEEE80211_FCTL_STYPE) {
1506         case IEEE80211_STYPE_PROBE_REQ:
1507                 ieee80211_rx_mgmt_probe_req(sdata, skb);
1508                 break;
1509         case IEEE80211_STYPE_PROBE_RESP:
1510         case IEEE80211_STYPE_BEACON:
1511                 ieee80211_rx_mgmt_probe_beacon(sdata, mgmt, skb->len,
1512                                                rx_status);
1513                 break;
1514         case IEEE80211_STYPE_AUTH:
1515                 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len);
1516                 break;
1517         case IEEE80211_STYPE_DEAUTH:
1518                 ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len);
1519                 break;
1520         case IEEE80211_STYPE_ACTION:
1521                 switch (mgmt->u.action.category) {
1522                 case WLAN_CATEGORY_SPECTRUM_MGMT:
1523                         ies_len = skb->len -
1524                                   offsetof(struct ieee80211_mgmt,
1525                                            u.action.u.chan_switch.variable);
1526
1527                         if (ies_len < 0)
1528                                 break;
1529
1530                         ieee802_11_parse_elems(
1531                                 mgmt->u.action.u.chan_switch.variable,
1532                                 ies_len, true, &elems);
1533
1534                         if (elems.parse_error)
1535                                 break;
1536
1537                         ieee80211_rx_mgmt_spectrum_mgmt(sdata, mgmt, skb->len,
1538                                                         rx_status, &elems);
1539                         break;
1540                 }
1541         }
1542
1543  mgmt_out:
1544         sdata_unlock(sdata);
1545 }
1546
1547 void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata)
1548 {
1549         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1550         struct sta_info *sta;
1551
1552         sdata_lock(sdata);
1553
1554         /*
1555          * Work could be scheduled after scan or similar
1556          * when we aren't even joined (or trying) with a
1557          * network.
1558          */
1559         if (!ifibss->ssid_len)
1560                 goto out;
1561
1562         spin_lock_bh(&ifibss->incomplete_lock);
1563         while (!list_empty(&ifibss->incomplete_stations)) {
1564                 sta = list_first_entry(&ifibss->incomplete_stations,
1565                                        struct sta_info, list);
1566                 list_del(&sta->list);
1567                 spin_unlock_bh(&ifibss->incomplete_lock);
1568
1569                 ieee80211_ibss_finish_sta(sta);
1570                 rcu_read_unlock();
1571                 spin_lock_bh(&ifibss->incomplete_lock);
1572         }
1573         spin_unlock_bh(&ifibss->incomplete_lock);
1574
1575         switch (ifibss->state) {
1576         case IEEE80211_IBSS_MLME_SEARCH:
1577                 ieee80211_sta_find_ibss(sdata);
1578                 break;
1579         case IEEE80211_IBSS_MLME_JOINED:
1580                 ieee80211_sta_merge_ibss(sdata);
1581                 break;
1582         default:
1583                 WARN_ON(1);
1584                 break;
1585         }
1586
1587  out:
1588         sdata_unlock(sdata);
1589 }
1590
1591 static void ieee80211_ibss_timer(unsigned long data)
1592 {
1593         struct ieee80211_sub_if_data *sdata =
1594                 (struct ieee80211_sub_if_data *) data;
1595
1596         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1597 }
1598
1599 void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata)
1600 {
1601         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1602
1603         setup_timer(&ifibss->timer, ieee80211_ibss_timer,
1604                     (unsigned long) sdata);
1605         INIT_LIST_HEAD(&ifibss->incomplete_stations);
1606         spin_lock_init(&ifibss->incomplete_lock);
1607         INIT_WORK(&ifibss->csa_connection_drop_work,
1608                   ieee80211_csa_connection_drop_work);
1609 }
1610
1611 /* scan finished notification */
1612 void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local)
1613 {
1614         struct ieee80211_sub_if_data *sdata;
1615
1616         mutex_lock(&local->iflist_mtx);
1617         list_for_each_entry(sdata, &local->interfaces, list) {
1618                 if (!ieee80211_sdata_running(sdata))
1619                         continue;
1620                 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
1621                         continue;
1622                 sdata->u.ibss.last_scan_completed = jiffies;
1623                 ieee80211_queue_work(&local->hw, &sdata->work);
1624         }
1625         mutex_unlock(&local->iflist_mtx);
1626 }
1627
1628 int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
1629                         struct cfg80211_ibss_params *params)
1630 {
1631         u32 changed = 0;
1632         u32 rate_flags;
1633         struct ieee80211_supported_band *sband;
1634         enum ieee80211_chanctx_mode chanmode;
1635         struct ieee80211_local *local = sdata->local;
1636         int radar_detect_width = 0;
1637         int i;
1638         int ret;
1639
1640         ret = cfg80211_chandef_dfs_required(local->hw.wiphy,
1641                                             &params->chandef,
1642                                             sdata->wdev.iftype);
1643         if (ret < 0)
1644                 return ret;
1645
1646         if (ret > 0) {
1647                 if (!params->userspace_handles_dfs)
1648                         return -EINVAL;
1649                 radar_detect_width = BIT(params->chandef.width);
1650         }
1651
1652         chanmode = (params->channel_fixed && !ret) ?
1653                 IEEE80211_CHANCTX_SHARED : IEEE80211_CHANCTX_EXCLUSIVE;
1654
1655         mutex_lock(&local->chanctx_mtx);
1656         ret = ieee80211_check_combinations(sdata, &params->chandef, chanmode,
1657                                            radar_detect_width);
1658         mutex_unlock(&local->chanctx_mtx);
1659         if (ret < 0)
1660                 return ret;
1661
1662         if (params->bssid) {
1663                 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN);
1664                 sdata->u.ibss.fixed_bssid = true;
1665         } else
1666                 sdata->u.ibss.fixed_bssid = false;
1667
1668         sdata->u.ibss.privacy = params->privacy;
1669         sdata->u.ibss.control_port = params->control_port;
1670         sdata->u.ibss.userspace_handles_dfs = params->userspace_handles_dfs;
1671         sdata->u.ibss.basic_rates = params->basic_rates;
1672         sdata->u.ibss.last_scan_completed = jiffies;
1673
1674         /* fix basic_rates if channel does not support these rates */
1675         rate_flags = ieee80211_chandef_rate_flags(&params->chandef);
1676         sband = local->hw.wiphy->bands[params->chandef.chan->band];
1677         for (i = 0; i < sband->n_bitrates; i++) {
1678                 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
1679                         sdata->u.ibss.basic_rates &= ~BIT(i);
1680         }
1681         memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate,
1682                sizeof(params->mcast_rate));
1683
1684         sdata->vif.bss_conf.beacon_int = params->beacon_interval;
1685
1686         sdata->u.ibss.chandef = params->chandef;
1687         sdata->u.ibss.fixed_channel = params->channel_fixed;
1688
1689         if (params->ie) {
1690                 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len,
1691                                            GFP_KERNEL);
1692                 if (sdata->u.ibss.ie)
1693                         sdata->u.ibss.ie_len = params->ie_len;
1694         }
1695
1696         sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
1697         sdata->u.ibss.ibss_join_req = jiffies;
1698
1699         memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len);
1700         sdata->u.ibss.ssid_len = params->ssid_len;
1701
1702         memcpy(&sdata->u.ibss.ht_capa, &params->ht_capa,
1703                sizeof(sdata->u.ibss.ht_capa));
1704         memcpy(&sdata->u.ibss.ht_capa_mask, &params->ht_capa_mask,
1705                sizeof(sdata->u.ibss.ht_capa_mask));
1706
1707         /*
1708          * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is
1709          * reserved, but an HT STA shall protect HT transmissions as though
1710          * the HT Protection field were set to non-HT mixed mode.
1711          *
1712          * In an IBSS, the RIFS Mode field of the HT Operation element is
1713          * also reserved, but an HT STA shall operate as though this field
1714          * were set to 1.
1715          */
1716
1717         sdata->vif.bss_conf.ht_operation_mode |=
1718                   IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED
1719                 | IEEE80211_HT_PARAM_RIFS_MODE;
1720
1721         changed |= BSS_CHANGED_HT;
1722         ieee80211_bss_info_change_notify(sdata, changed);
1723
1724         sdata->smps_mode = IEEE80211_SMPS_OFF;
1725         sdata->needed_rx_chains = local->rx_chains;
1726
1727         ieee80211_queue_work(&local->hw, &sdata->work);
1728
1729         return 0;
1730 }
1731
1732 int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata)
1733 {
1734         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1735
1736         ieee80211_ibss_disconnect(sdata);
1737         ifibss->ssid_len = 0;
1738         memset(ifibss->bssid, 0, ETH_ALEN);
1739
1740         /* remove beacon */
1741         kfree(sdata->u.ibss.ie);
1742
1743         /* on the next join, re-program HT parameters */
1744         memset(&ifibss->ht_capa, 0, sizeof(ifibss->ht_capa));
1745         memset(&ifibss->ht_capa_mask, 0, sizeof(ifibss->ht_capa_mask));
1746
1747         synchronize_rcu();
1748
1749         skb_queue_purge(&sdata->skb_queue);
1750
1751         del_timer_sync(&sdata->u.ibss.timer);
1752
1753         return 0;
1754 }