net/mac80211/ibss.c

   1 /*
   2  * IBSS mode implementation
   3  * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
   4  * Copyright 2004, Instant802 Networks, Inc.
   5  * Copyright 2005, Devicescape Software, Inc.
   6  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   7  * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
   8  * Copyright 2009, Johannes Berg <johannes@sipsolutions.net>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2 as
  12  * published by the Free Software Foundation.
  13  */
  14
  15 #include <linux/delay.h>
  16 #include <linux/slab.h>
  17 #include <linux/if_ether.h>
  18 #include <linux/skbuff.h>
  19 #include <linux/if_arp.h>
  20 #include <linux/etherdevice.h>
  21 #include <linux/rtnetlink.h>
  22 #include <net/mac80211.h>
  23
  24 #include "ieee80211_i.h"
  25 #include "driver-ops.h"
  26 #include "rate.h"
  27
  28 #define IEEE80211_SCAN_INTERVAL (2 * HZ)
  29 #define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ)
  30
  31 #define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ)
  32 #define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ)
  33 #define IEEE80211_IBSS_RSN_INACTIVITY_LIMIT (10 * HZ)
  34
  35 #define IEEE80211_IBSS_MAX_STA_ENTRIES 128
  36
  37 static struct beacon_data *
  38 ieee80211_ibss_build_presp(struct ieee80211_sub_if_data *sdata,
  39                            const int beacon_int, const u32 basic_rates,
  40                            const u16 capability, u64 tsf,
  41                            struct cfg80211_chan_def *chandef,
  42                            bool *have_higher_than_11mbit,
  43                            struct cfg80211_csa_settings *csa_settings)
  44 {
  45         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
  46         struct ieee80211_local *local = sdata->local;
  47         int rates_n = 0, i, ri;
  48         struct ieee80211_mgmt *mgmt;
  49         u8 *pos;
  50         struct ieee80211_supported_band *sband;
  51         u32 rate_flags, rates = 0, rates_added = 0;
  52         struct beacon_data *presp;
  53         int frame_len;
  54         int shift;
  55
  56         /* Build IBSS probe response */
  57         frame_len = sizeof(struct ieee80211_hdr_3addr) +
  58                     12 /* struct ieee80211_mgmt.u.beacon */ +
  59                     2 + IEEE80211_MAX_SSID_LEN /* max SSID */ +
  60                     2 + 8 /* max Supported Rates */ +
  61                     3 /* max DS params */ +
  62                     4 /* IBSS params */ +
  63                     5 /* Channel Switch Announcement */ +
  64                     2 + (IEEE80211_MAX_SUPP_RATES - 8) +
  65                     2 + sizeof(struct ieee80211_ht_cap) +
  66                     2 + sizeof(struct ieee80211_ht_operation) +
  67                     ifibss->ie_len;
  68         presp = kzalloc(sizeof(*presp) + frame_len, GFP_KERNEL);
  69         if (!presp)
  70                 return NULL;
  71
  72         presp->head = (void *)(presp + 1);
  73
  74         mgmt = (void *) presp->head;
  75         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
  76                                           IEEE80211_STYPE_PROBE_RESP);
  77         eth_broadcast_addr(mgmt->da);
  78         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
  79         memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN);
  80         mgmt->u.beacon.beacon_int = cpu_to_le16(beacon_int);
  81         mgmt->u.beacon.timestamp = cpu_to_le64(tsf);
  82         mgmt->u.beacon.capab_info = cpu_to_le16(capability);
  83
  84         pos = (u8 *)mgmt + offsetof(struct ieee80211_mgmt, u.beacon.variable);
  85
  86         *pos++ = WLAN_EID_SSID;
  87         *pos++ = ifibss->ssid_len;
  88         memcpy(pos, ifibss->ssid, ifibss->ssid_len);
  89         pos += ifibss->ssid_len;
  90
  91         sband = local->hw.wiphy->bands[chandef->chan->band];
  92         rate_flags = ieee80211_chandef_rate_flags(chandef);
  93         shift = ieee80211_chandef_get_shift(chandef);
  94         rates_n = 0;
  95         if (have_higher_than_11mbit)
  96                 *have_higher_than_11mbit = false;
  97
  98         for (i = 0; i < sband->n_bitrates; i++) {
  99                 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
 100                         continue;
 101                 if (sband->bitrates[i].bitrate > 110 &&
 102                     have_higher_than_11mbit)
 103                         *have_higher_than_11mbit = true;
 104
 105                 rates |= BIT(i);
 106                 rates_n++;
 107         }
 108
 109         *pos++ = WLAN_EID_SUPP_RATES;
 110         *pos++ = min_t(int, 8, rates_n);
 111         for (ri = 0; ri < sband->n_bitrates; ri++) {
 112                 int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate,
 113                                         5 * (1 << shift));
 114                 u8 basic = 0;
 115                 if (!(rates & BIT(ri)))
 116                         continue;
 117
 118                 if (basic_rates & BIT(ri))
 119                         basic = 0x80;
 120                 *pos++ = basic | (u8) rate;
 121                 if (++rates_added == 8) {
 122                         ri++; /* continue at next rate for EXT_SUPP_RATES */
 123                         break;
 124                 }
 125         }
 126
 127         if (sband->band == IEEE80211_BAND_2GHZ) {
 128                 *pos++ = WLAN_EID_DS_PARAMS;
 129                 *pos++ = 1;
 130                 *pos++ = ieee80211_frequency_to_channel(
 131                                 chandef->chan->center_freq);
 132         }
 133
 134         *pos++ = WLAN_EID_IBSS_PARAMS;
 135         *pos++ = 2;
 136         /* FIX: set ATIM window based on scan results */
 137         *pos++ = 0;
 138         *pos++ = 0;
 139
 140         if (csa_settings) {
 141                 *pos++ = WLAN_EID_CHANNEL_SWITCH;
 142                 *pos++ = 3;
 143                 *pos++ = csa_settings->block_tx ? 1 : 0;
 144                 *pos++ = ieee80211_frequency_to_channel(
 145                                 csa_settings->chandef.chan->center_freq);
 146                 presp->csa_counter_offsets[0] = (pos - presp->head);
 147                 *pos++ = csa_settings->count;
 148         }
 149
 150         /* put the remaining rates in WLAN_EID_EXT_SUPP_RATES */
 151         if (rates_n > 8) {
 152                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 153                 *pos++ = rates_n - 8;
 154                 for (; ri < sband->n_bitrates; ri++) {
 155                         int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate,
 156                                                 5 * (1 << shift));
 157                         u8 basic = 0;
 158                         if (!(rates & BIT(ri)))
 159                                 continue;
 160
 161                         if (basic_rates & BIT(ri))
 162                                 basic = 0x80;
 163                         *pos++ = basic | (u8) rate;
 164                 }
 165         }
 166
 167         if (ifibss->ie_len) {
 168                 memcpy(pos, ifibss->ie, ifibss->ie_len);
 169                 pos += ifibss->ie_len;
 170         }
 171
 172         /* add HT capability and information IEs */
 173         if (chandef->width != NL80211_CHAN_WIDTH_20_NOHT &&
 174             chandef->width != NL80211_CHAN_WIDTH_5 &&
 175             chandef->width != NL80211_CHAN_WIDTH_10 &&
 176             sband->ht_cap.ht_supported) {
 177                 struct ieee80211_sta_ht_cap ht_cap;
 178
 179                 memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
 180                 ieee80211_apply_htcap_overrides(sdata, &ht_cap);
 181
 182                 pos = ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap);
 183                 /*
 184                  * Note: According to 802.11n-2009 9.13.3.1, HT Protection
 185                  * field and RIFS Mode are reserved in IBSS mode, therefore
 186                  * keep them at 0
 187                  */
 188                 pos = ieee80211_ie_build_ht_oper(pos, &sband->ht_cap,
 189                                                  chandef, 0);
 190         }
 191
 192         if (local->hw.queues >= IEEE80211_NUM_ACS)
 193                 pos = ieee80211_add_wmm_info_ie(pos, 0); /* U-APSD not in use */
 194
 195         presp->head_len = pos - presp->head;
 196         if (WARN_ON(presp->head_len > frame_len))
 197                 goto error;
 198
 199         return presp;
 200 error:
 201         kfree(presp);
 202         return NULL;
 203 }
 204
 205 static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
 206                                       const u8 *bssid, const int beacon_int,
 207                                       struct cfg80211_chan_def *req_chandef,
 208                                       const u32 basic_rates,
 209                                       const u16 capability, u64 tsf,
 210                                       bool creator)
 211 {
 212         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 213         struct ieee80211_local *local = sdata->local;
 214         struct ieee80211_mgmt *mgmt;
 215         struct cfg80211_bss *bss;
 216         u32 bss_change;
 217         struct cfg80211_chan_def chandef;
 218         struct ieee80211_channel *chan;
 219         struct beacon_data *presp;
 220         enum nl80211_bss_scan_width scan_width;
 221         bool have_higher_than_11mbit;
 222         bool radar_required;
 223         int err;
 224
 225         sdata_assert_lock(sdata);
 226
 227         /* Reset own TSF to allow time synchronization work. */
 228         drv_reset_tsf(local, sdata);
 229
 230         if (!ether_addr_equal(ifibss->bssid, bssid))
 231                 sta_info_flush(sdata);
 232
 233         /* if merging, indicate to driver that we leave the old IBSS */
 234         if (sdata->vif.bss_conf.ibss_joined) {
 235                 sdata->vif.bss_conf.ibss_joined = false;
 236                 sdata->vif.bss_conf.ibss_creator = false;
 237                 sdata->vif.bss_conf.enable_beacon = false;
 238                 netif_carrier_off(sdata->dev);
 239                 ieee80211_bss_info_change_notify(sdata,
 240                                                  BSS_CHANGED_IBSS |
 241                                                  BSS_CHANGED_BEACON_ENABLED);
 242                 drv_leave_ibss(local, sdata);
 243         }
 244
 245         presp = rcu_dereference_protected(ifibss->presp,
 246                                           lockdep_is_held(&sdata->wdev.mtx));
 247         RCU_INIT_POINTER(ifibss->presp, NULL);
 248         if (presp)
 249                 kfree_rcu(presp, rcu_head);
 250
 251         sdata->drop_unencrypted = capability & WLAN_CAPABILITY_PRIVACY ? 1 : 0;
 252
 253         /* make a copy of the chandef, it could be modified below. */
 254         chandef = *req_chandef;
 255         chan = chandef.chan;
 256         if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef,
 257                                      NL80211_IFTYPE_ADHOC)) {
 258                 if (chandef.width == NL80211_CHAN_WIDTH_5 ||
 259                     chandef.width == NL80211_CHAN_WIDTH_10 ||
 260                     chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
 261                     chandef.width == NL80211_CHAN_WIDTH_20) {
 262                         sdata_info(sdata,
 263                                    "Failed to join IBSS, beacons forbidden\n");
 264                         return;
 265                 }
 266                 chandef.width = NL80211_CHAN_WIDTH_20;
 267                 chandef.center_freq1 = chan->center_freq;
 268                 /* check again for downgraded chandef */
 269                 if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef,
 270                                              NL80211_IFTYPE_ADHOC)) {
 271                         sdata_info(sdata,
 272                                    "Failed to join IBSS, beacons forbidden\n");
 273                         return;
 274                 }
 275         }
 276
 277         err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
 278                                             &chandef, NL80211_IFTYPE_ADHOC);
 279         if (err < 0) {
 280                 sdata_info(sdata,
 281                            "Failed to join IBSS, invalid chandef\n");
 282                 return;
 283         }
 284         if (err > 0 && !ifibss->userspace_handles_dfs) {
 285                 sdata_info(sdata,
 286                            "Failed to join IBSS, DFS channel without control program\n");
 287                 return;
 288         }
 289
 290         radar_required = err;
 291
 292         mutex_lock(&local->mtx);
 293         if (ieee80211_vif_use_channel(sdata, &chandef,
 294                                       ifibss->fixed_channel ?
 295                                         IEEE80211_CHANCTX_SHARED :
 296                                         IEEE80211_CHANCTX_EXCLUSIVE)) {
 297                 sdata_info(sdata, "Failed to join IBSS, no channel context\n");
 298                 mutex_unlock(&local->mtx);
 299                 return;
 300         }
 301         sdata->radar_required = radar_required;
 302         mutex_unlock(&local->mtx);
 303
 304         memcpy(ifibss->bssid, bssid, ETH_ALEN);
 305
 306         presp = ieee80211_ibss_build_presp(sdata, beacon_int, basic_rates,
 307                                            capability, tsf, &chandef,
 308                                            &have_higher_than_11mbit, NULL);
 309         if (!presp)
 310                 return;
 311
 312         rcu_assign_pointer(ifibss->presp, presp);
 313         mgmt = (void *)presp->head;
 314
 315         sdata->vif.bss_conf.enable_beacon = true;
 316         sdata->vif.bss_conf.beacon_int = beacon_int;
 317         sdata->vif.bss_conf.basic_rates = basic_rates;
 318         sdata->vif.bss_conf.ssid_len = ifibss->ssid_len;
 319         memcpy(sdata->vif.bss_conf.ssid, ifibss->ssid, ifibss->ssid_len);
 320         bss_change = BSS_CHANGED_BEACON_INT;
 321         bss_change |= ieee80211_reset_erp_info(sdata);
 322         bss_change |= BSS_CHANGED_BSSID;
 323         bss_change |= BSS_CHANGED_BEACON;
 324         bss_change |= BSS_CHANGED_BEACON_ENABLED;
 325         bss_change |= BSS_CHANGED_BASIC_RATES;
 326         bss_change |= BSS_CHANGED_HT;
 327         bss_change |= BSS_CHANGED_IBSS;
 328         bss_change |= BSS_CHANGED_SSID;
 329
 330         /*
 331          * In 5 GHz/802.11a, we can always use short slot time.
 332          * (IEEE 802.11-2012 18.3.8.7)
 333          *
 334          * In 2.4GHz, we must always use long slots in IBSS for compatibility
 335          * reasons.
 336          * (IEEE 802.11-2012 19.4.5)
 337          *
 338          * HT follows these specifications (IEEE 802.11-2012 20.3.18)
 339          */
 340         sdata->vif.bss_conf.use_short_slot = chan->band == IEEE80211_BAND_5GHZ;
 341         bss_change |= BSS_CHANGED_ERP_SLOT;
 342
 343         /* cf. IEEE 802.11 9.2.12 */
 344         if (chan->band == IEEE80211_BAND_2GHZ && have_higher_than_11mbit)
 345                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
 346         else
 347                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
 348
 349         ieee80211_set_wmm_default(sdata, true);
 350
 351         sdata->vif.bss_conf.ibss_joined = true;
 352         sdata->vif.bss_conf.ibss_creator = creator;
 353
 354         err = drv_join_ibss(local, sdata);
 355         if (err) {
 356                 sdata->vif.bss_conf.ibss_joined = false;
 357                 sdata->vif.bss_conf.ibss_creator = false;
 358                 sdata->vif.bss_conf.enable_beacon = false;
 359                 sdata->vif.bss_conf.ssid_len = 0;
 360                 RCU_INIT_POINTER(ifibss->presp, NULL);
 361                 kfree_rcu(presp, rcu_head);
 362                 mutex_lock(&local->mtx);
 363                 ieee80211_vif_release_channel(sdata);
 364                 mutex_unlock(&local->mtx);
 365                 sdata_info(sdata, "Failed to join IBSS, driver failure: %d\n",
 366                            err);
 367                 return;
 368         }
 369
 370         ieee80211_bss_info_change_notify(sdata, bss_change);
 371
 372         ifibss->state = IEEE80211_IBSS_MLME_JOINED;
 373         mod_timer(&ifibss->timer,
 374                   round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
 375
 376         scan_width = cfg80211_chandef_to_scan_width(&chandef);
 377         bss = cfg80211_inform_bss_width_frame(local->hw.wiphy, chan,
 378                                               scan_width, mgmt,
 379                                               presp->head_len, 0, GFP_KERNEL);
 380         cfg80211_put_bss(local->hw.wiphy, bss);
 381         netif_carrier_on(sdata->dev);
 382         cfg80211_ibss_joined(sdata->dev, ifibss->bssid, chan, GFP_KERNEL);
 383 }
 384
 385 static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
 386                                     struct ieee80211_bss *bss)
 387 {
 388         struct cfg80211_bss *cbss =
 389                 container_of((void *)bss, struct cfg80211_bss, priv);
 390         struct ieee80211_supported_band *sband;
 391         struct cfg80211_chan_def chandef;
 392         u32 basic_rates;
 393         int i, j;
 394         u16 beacon_int = cbss->beacon_interval;
 395         const struct cfg80211_bss_ies *ies;
 396         enum nl80211_channel_type chan_type;
 397         u64 tsf;
 398         u32 rate_flags;
 399         int shift;
 400
 401         sdata_assert_lock(sdata);
 402
 403         if (beacon_int < 10)
 404                 beacon_int = 10;
 405
 406         switch (sdata->u.ibss.chandef.width) {
 407         case NL80211_CHAN_WIDTH_20_NOHT:
 408         case NL80211_CHAN_WIDTH_20:
 409         case NL80211_CHAN_WIDTH_40:
 410                 chan_type = cfg80211_get_chandef_type(&sdata->u.ibss.chandef);
 411                 cfg80211_chandef_create(&chandef, cbss->channel, chan_type);
 412                 break;
 413         case NL80211_CHAN_WIDTH_5:
 414         case NL80211_CHAN_WIDTH_10:
 415                 cfg80211_chandef_create(&chandef, cbss->channel,
 416                                         NL80211_CHAN_WIDTH_20_NOHT);
 417                 chandef.width = sdata->u.ibss.chandef.width;
 418                 break;
 419         default:
 420                 /* fall back to 20 MHz for unsupported modes */
 421                 cfg80211_chandef_create(&chandef, cbss->channel,
 422                                         NL80211_CHAN_WIDTH_20_NOHT);
 423                 break;
 424         }
 425
 426         sband = sdata->local->hw.wiphy->bands[cbss->channel->band];
 427         rate_flags = ieee80211_chandef_rate_flags(&sdata->u.ibss.chandef);
 428         shift = ieee80211_vif_get_shift(&sdata->vif);
 429
 430         basic_rates = 0;
 431
 432         for (i = 0; i < bss->supp_rates_len; i++) {
 433                 int rate = bss->supp_rates[i] & 0x7f;
 434                 bool is_basic = !!(bss->supp_rates[i] & 0x80);
 435
 436                 for (j = 0; j < sband->n_bitrates; j++) {
 437                         int brate;
 438                         if ((rate_flags & sband->bitrates[j].flags)
 439                             != rate_flags)
 440                                 continue;
 441
 442                         brate = DIV_ROUND_UP(sband->bitrates[j].bitrate,
 443                                              5 * (1 << shift));
 444                         if (brate == rate) {
 445                                 if (is_basic)
 446                                         basic_rates |= BIT(j);
 447                                 break;
 448                         }
 449                 }
 450         }
 451
 452         rcu_read_lock();
 453         ies = rcu_dereference(cbss->ies);
 454         tsf = ies->tsf;
 455         rcu_read_unlock();
 456
 457         __ieee80211_sta_join_ibss(sdata, cbss->bssid,
 458                                   beacon_int,
 459                                   &chandef,
 460                                   basic_rates,
 461                                   cbss->capability,
 462                                   tsf, false);
 463 }
 464
 465 int ieee80211_ibss_csa_beacon(struct ieee80211_sub_if_data *sdata,
 466                               struct cfg80211_csa_settings *csa_settings)
 467 {
 468         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 469         struct beacon_data *presp, *old_presp;
 470         struct cfg80211_bss *cbss;
 471         const struct cfg80211_bss_ies *ies;
 472         u16 capability;
 473         u64 tsf;
 474         int ret = 0;
 475
 476         sdata_assert_lock(sdata);
 477
 478         capability = WLAN_CAPABILITY_IBSS;
 479
 480         if (ifibss->privacy)
 481                 capability |= WLAN_CAPABILITY_PRIVACY;
 482
 483         cbss = cfg80211_get_bss(sdata->local->hw.wiphy, ifibss->chandef.chan,
 484                                 ifibss->bssid, ifibss->ssid,
 485                                 ifibss->ssid_len, WLAN_CAPABILITY_IBSS |
 486                                 WLAN_CAPABILITY_PRIVACY,
 487                                 capability);
 488
 489         if (WARN_ON(!cbss)) {
 490                 ret = -EINVAL;
 491                 goto out;
 492         }
 493
 494         rcu_read_lock();
 495         ies = rcu_dereference(cbss->ies);
 496         tsf = ies->tsf;
 497         rcu_read_unlock();
 498         cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
 499
 500         old_presp = rcu_dereference_protected(ifibss->presp,
 501                                           lockdep_is_held(&sdata->wdev.mtx));
 502
 503         presp = ieee80211_ibss_build_presp(sdata,
 504                                            sdata->vif.bss_conf.beacon_int,
 505                                            sdata->vif.bss_conf.basic_rates,
 506                                            capability, tsf, &ifibss->chandef,
 507                                            NULL, csa_settings);
 508         if (!presp) {
 509                 ret = -ENOMEM;
 510                 goto out;
 511         }
 512
 513         rcu_assign_pointer(ifibss->presp, presp);
 514         if (old_presp)
 515                 kfree_rcu(old_presp, rcu_head);
 516
 517         return BSS_CHANGED_BEACON;
 518  out:
 519         return ret;
 520 }
 521
 522 int ieee80211_ibss_finish_csa(struct ieee80211_sub_if_data *sdata)
 523 {
 524         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 525         struct cfg80211_bss *cbss;
 526         int err, changed = 0;
 527         u16 capability;
 528
 529         sdata_assert_lock(sdata);
 530
 531         /* update cfg80211 bss information with the new channel */
 532         if (!is_zero_ether_addr(ifibss->bssid)) {
 533                 capability = WLAN_CAPABILITY_IBSS;
 534
 535                 if (ifibss->privacy)
 536                         capability |= WLAN_CAPABILITY_PRIVACY;
 537
 538                 cbss = cfg80211_get_bss(sdata->local->hw.wiphy,
 539                                         ifibss->chandef.chan,
 540                                         ifibss->bssid, ifibss->ssid,
 541                                         ifibss->ssid_len, WLAN_CAPABILITY_IBSS |
 542                                         WLAN_CAPABILITY_PRIVACY,
 543                                         capability);
 544                 /* XXX: should not really modify cfg80211 data */
 545                 if (cbss) {
 546                         cbss->channel = sdata->csa_chandef.chan;
 547                         cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
 548                 }
 549         }
 550
 551         ifibss->chandef = sdata->csa_chandef;
 552
 553         /* generate the beacon */
 554         err = ieee80211_ibss_csa_beacon(sdata, NULL);
 555         if (err < 0)
 556                 return err;
 557
 558         changed |= err;
 559
 560         return changed;
 561 }
 562
 563 void ieee80211_ibss_stop(struct ieee80211_sub_if_data *sdata)
 564 {
 565         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 566
 567         cancel_work_sync(&ifibss->csa_connection_drop_work);
 568 }
 569
 570 static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta)
 571         __acquires(RCU)
 572 {
 573         struct ieee80211_sub_if_data *sdata = sta->sdata;
 574         u8 addr[ETH_ALEN];
 575
 576         memcpy(addr, sta->sta.addr, ETH_ALEN);
 577
 578         ibss_dbg(sdata, "Adding new IBSS station %pM\n", addr);
 579
 580         sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
 581         sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
 582         /* authorize the station only if the network is not RSN protected. If
 583          * not wait for the userspace to authorize it */
 584         if (!sta->sdata->u.ibss.control_port)
 585                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
 586
 587         rate_control_rate_init(sta);
 588
 589         /* If it fails, maybe we raced another insertion? */
 590         if (sta_info_insert_rcu(sta))
 591                 return sta_info_get(sdata, addr);
 592         return sta;
 593 }
 594
 595 static struct sta_info *
 596 ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, const u8 *bssid,
 597                        const u8 *addr, u32 supp_rates)
 598         __acquires(RCU)
 599 {
 600         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 601         struct ieee80211_local *local = sdata->local;
 602         struct sta_info *sta;
 603         struct ieee80211_chanctx_conf *chanctx_conf;
 604         struct ieee80211_supported_band *sband;
 605         enum nl80211_bss_scan_width scan_width;
 606         int band;
 607
 608         /*
 609          * XXX: Consider removing the least recently used entry and
 610          *      allow new one to be added.
 611          */
 612         if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
 613                 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
 614                                     sdata->name, addr);
 615                 rcu_read_lock();
 616                 return NULL;
 617         }
 618
 619         if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) {
 620                 rcu_read_lock();
 621                 return NULL;
 622         }
 623
 624         if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) {
 625                 rcu_read_lock();
 626                 return NULL;
 627         }
 628
 629         rcu_read_lock();
 630         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 631         if (WARN_ON_ONCE(!chanctx_conf))
 632                 return NULL;
 633         band = chanctx_conf->def.chan->band;
 634         scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
 635         rcu_read_unlock();
 636
 637         sta = sta_info_alloc(sdata, addr, GFP_KERNEL);
 638         if (!sta) {
 639                 rcu_read_lock();
 640                 return NULL;
 641         }
 642
 643         sta->last_rx = jiffies;
 644
 645         /* make sure mandatory rates are always added */
 646         sband = local->hw.wiphy->bands[band];
 647         sta->sta.supp_rates[band] = supp_rates |
 648                         ieee80211_mandatory_rates(sband, scan_width);
 649
 650         return ieee80211_ibss_finish_sta(sta);
 651 }
 652
 653 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
 654 {
 655         struct ieee80211_local *local = sdata->local;
 656         int active = 0;
 657         struct sta_info *sta;
 658
 659         sdata_assert_lock(sdata);
 660
 661         rcu_read_lock();
 662
 663         list_for_each_entry_rcu(sta, &local->sta_list, list) {
 664                 if (sta->sdata == sdata &&
 665                     time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
 666                                jiffies)) {
 667                         active++;
 668                         break;
 669                 }
 670         }
 671
 672         rcu_read_unlock();
 673
 674         return active;
 675 }
 676
 677 static void ieee80211_ibss_disconnect(struct ieee80211_sub_if_data *sdata)
 678 {
 679         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 680         struct ieee80211_local *local = sdata->local;
 681         struct cfg80211_bss *cbss;
 682         struct beacon_data *presp;
 683         struct sta_info *sta;
 684         u16 capability;
 685
 686         if (!is_zero_ether_addr(ifibss->bssid)) {
 687                 capability = WLAN_CAPABILITY_IBSS;
 688
 689                 if (ifibss->privacy)
 690                         capability |= WLAN_CAPABILITY_PRIVACY;
 691
 692                 cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->chandef.chan,
 693                                         ifibss->bssid, ifibss->ssid,
 694                                         ifibss->ssid_len, WLAN_CAPABILITY_IBSS |
 695                                         WLAN_CAPABILITY_PRIVACY,
 696                                         capability);
 697
 698                 if (cbss) {
 699                         cfg80211_unlink_bss(local->hw.wiphy, cbss);
 700                         cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
 701                 }
 702         }
 703
 704         ifibss->state = IEEE80211_IBSS_MLME_SEARCH;
 705
 706         sta_info_flush(sdata);
 707
 708         spin_lock_bh(&ifibss->incomplete_lock);
 709         while (!list_empty(&ifibss->incomplete_stations)) {
 710                 sta = list_first_entry(&ifibss->incomplete_stations,
 711                                        struct sta_info, list);
 712                 list_del(&sta->list);
 713                 spin_unlock_bh(&ifibss->incomplete_lock);
 714
 715                 sta_info_free(local, sta);
 716                 spin_lock_bh(&ifibss->incomplete_lock);
 717         }
 718         spin_unlock_bh(&ifibss->incomplete_lock);
 719
 720         netif_carrier_off(sdata->dev);
 721
 722         sdata->vif.bss_conf.ibss_joined = false;
 723         sdata->vif.bss_conf.ibss_creator = false;
 724         sdata->vif.bss_conf.enable_beacon = false;
 725         sdata->vif.bss_conf.ssid_len = 0;
 726
 727         /* remove beacon */
 728         presp = rcu_dereference_protected(ifibss->presp,
 729                                           lockdep_is_held(&sdata->wdev.mtx));
 730         RCU_INIT_POINTER(sdata->u.ibss.presp, NULL);
 731         if (presp)
 732                 kfree_rcu(presp, rcu_head);
 733
 734         clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state);
 735         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED |
 736                                                 BSS_CHANGED_IBSS);
 737         drv_leave_ibss(local, sdata);
 738         mutex_lock(&local->mtx);
 739         ieee80211_vif_release_channel(sdata);
 740         mutex_unlock(&local->mtx);
 741 }
 742
 743 static void ieee80211_csa_connection_drop_work(struct work_struct *work)
 744 {
 745         struct ieee80211_sub_if_data *sdata =
 746                 container_of(work, struct ieee80211_sub_if_data,
 747                              u.ibss.csa_connection_drop_work);
 748
 749         sdata_lock(sdata);
 750
 751         ieee80211_ibss_disconnect(sdata);
 752         synchronize_rcu();
 753         skb_queue_purge(&sdata->skb_queue);
 754
 755         /* trigger a scan to find another IBSS network to join */
 756         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
 757
 758         sdata_unlock(sdata);
 759 }
 760
 761 static void ieee80211_ibss_csa_mark_radar(struct ieee80211_sub_if_data *sdata)
 762 {
 763         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 764         int err;
 765
 766         /* if the current channel is a DFS channel, mark the channel as
 767          * unavailable.
 768          */
 769         err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
 770                                             &ifibss->chandef,
 771                                             NL80211_IFTYPE_ADHOC);
 772         if (err > 0)
 773                 cfg80211_radar_event(sdata->local->hw.wiphy, &ifibss->chandef,
 774                                      GFP_ATOMIC);
 775 }
 776
 777 static bool
 778 ieee80211_ibss_process_chanswitch(struct ieee80211_sub_if_data *sdata,
 779                                   struct ieee802_11_elems *elems,
 780                                   bool beacon)
 781 {
 782         struct cfg80211_csa_settings params;
 783         struct ieee80211_csa_ie csa_ie;
 784         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 785         enum nl80211_channel_type ch_type;
 786         int err;
 787         u32 sta_flags;
 788
 789         sdata_assert_lock(sdata);
 790
 791         sta_flags = IEEE80211_STA_DISABLE_VHT;
 792         switch (ifibss->chandef.width) {
 793         case NL80211_CHAN_WIDTH_5:
 794         case NL80211_CHAN_WIDTH_10:
 795         case NL80211_CHAN_WIDTH_20_NOHT:
 796                 sta_flags |= IEEE80211_STA_DISABLE_HT;
 797                 /* fall through */
 798         case NL80211_CHAN_WIDTH_20:
 799                 sta_flags |= IEEE80211_STA_DISABLE_40MHZ;
 800                 break;
 801         default:
 802                 break;
 803         }
 804
 805         memset(&params, 0, sizeof(params));
 806         memset(&csa_ie, 0, sizeof(csa_ie));
 807         err = ieee80211_parse_ch_switch_ie(sdata, elems, beacon,
 808                                            ifibss->chandef.chan->band,
 809                                            sta_flags, ifibss->bssid, &csa_ie);
 810         /* can't switch to destination channel, fail */
 811         if (err < 0)
 812                 goto disconnect;
 813
 814         /* did not contain a CSA */
 815         if (err)
 816                 return false;
 817
 818         /* channel switch is not supported, disconnect */
 819         if (!(sdata->local->hw.wiphy->flags & WIPHY_FLAG_HAS_CHANNEL_SWITCH))
 820                 goto disconnect;
 821
 822         params.count = csa_ie.count;
 823         params.chandef = csa_ie.chandef;
 824
 825         switch (ifibss->chandef.width) {
 826         case NL80211_CHAN_WIDTH_20_NOHT:
 827         case NL80211_CHAN_WIDTH_20:
 828         case NL80211_CHAN_WIDTH_40:
 829                 /* keep our current HT mode (HT20/HT40+/HT40-), even if
 830                  * another mode  has been announced. The mode is not adopted
 831                  * within the beacon while doing CSA and we should therefore
 832                  * keep the mode which we announce.
 833                  */
 834                 ch_type = cfg80211_get_chandef_type(&ifibss->chandef);
 835                 cfg80211_chandef_create(&params.chandef, params.chandef.chan,
 836                                         ch_type);
 837                 break;
 838         case NL80211_CHAN_WIDTH_5:
 839         case NL80211_CHAN_WIDTH_10:
 840                 if (params.chandef.width != ifibss->chandef.width) {
 841                         sdata_info(sdata,
 842                                    "IBSS %pM received channel switch from incompatible channel width (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
 843                                    ifibss->bssid,
 844                                    params.chandef.chan->center_freq,
 845                                    params.chandef.width,
 846                                    params.chandef.center_freq1,
 847                                    params.chandef.center_freq2);
 848                         goto disconnect;
 849                 }
 850                 break;
 851         default:
 852                 /* should not happen, sta_flags should prevent VHT modes. */
 853                 WARN_ON(1);
 854                 goto disconnect;
 855         }
 856
 857         if (!cfg80211_reg_can_beacon(sdata->local->hw.wiphy, &params.chandef,
 858                                      NL80211_IFTYPE_ADHOC)) {
 859                 sdata_info(sdata,
 860                            "IBSS %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
 861                            ifibss->bssid,
 862                            params.chandef.chan->center_freq,
 863                            params.chandef.width,
 864                            params.chandef.center_freq1,
 865                            params.chandef.center_freq2);
 866                 goto disconnect;
 867         }
 868
 869         err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
 870                                             &params.chandef,
 871                                             NL80211_IFTYPE_ADHOC);
 872         if (err < 0)
 873                 goto disconnect;
 874         if (err > 0 && !ifibss->userspace_handles_dfs) {
 875                 /* IBSS-DFS only allowed with a control program */
 876                 goto disconnect;
 877         }
 878
 879         params.radar_required = err;
 880
 881         if (cfg80211_chandef_identical(&params.chandef,
 882                                        &sdata->vif.bss_conf.chandef)) {
 883                 ibss_dbg(sdata,
 884                          "received csa with an identical chandef, ignoring\n");
 885                 return true;
 886         }
 887
 888         /* all checks done, now perform the channel switch. */
 889         ibss_dbg(sdata,
 890                  "received channel switch announcement to go to channel %d MHz\n",
 891                  params.chandef.chan->center_freq);
 892
 893         params.block_tx = !!csa_ie.mode;
 894
 895         if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev,
 896                                      &params))
 897                 goto disconnect;
 898
 899         ieee80211_ibss_csa_mark_radar(sdata);
 900
 901         return true;
 902 disconnect:
 903         ibss_dbg(sdata, "Can't handle channel switch, disconnect\n");
 904         ieee80211_queue_work(&sdata->local->hw,
 905                              &ifibss->csa_connection_drop_work);
 906
 907         ieee80211_ibss_csa_mark_radar(sdata);
 908
 909         return true;
 910 }
 911
 912 static void
 913 ieee80211_rx_mgmt_spectrum_mgmt(struct ieee80211_sub_if_data *sdata,
 914                                 struct ieee80211_mgmt *mgmt, size_t len,
 915                                 struct ieee80211_rx_status *rx_status,
 916                                 struct ieee802_11_elems *elems)
 917 {
 918         int required_len;
 919
 920         if (len < IEEE80211_MIN_ACTION_SIZE + 1)
 921                 return;
 922
 923         /* CSA is the only action we handle for now */
 924         if (mgmt->u.action.u.measurement.action_code !=
 925             WLAN_ACTION_SPCT_CHL_SWITCH)
 926                 return;
 927
 928         required_len = IEEE80211_MIN_ACTION_SIZE +
 929                        sizeof(mgmt->u.action.u.chan_switch);
 930         if (len < required_len)
 931                 return;
 932
 933         if (!sdata->vif.csa_active)
 934                 ieee80211_ibss_process_chanswitch(sdata, elems, false);
 935 }
 936
 937 static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data *sdata,
 938                                           struct ieee80211_mgmt *mgmt,
 939                                           size_t len)
 940 {
 941         u16 reason = le16_to_cpu(mgmt->u.deauth.reason_code);
 942
 943         if (len < IEEE80211_DEAUTH_FRAME_LEN)
 944                 return;
 945
 946         ibss_dbg(sdata, "RX DeAuth SA=%pM DA=%pM BSSID=%pM (reason: %d)\n",
 947                  mgmt->sa, mgmt->da, mgmt->bssid, reason);
 948         sta_info_destroy_addr(sdata, mgmt->sa);
 949 }
 950
 951 static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata,
 952                                         struct ieee80211_mgmt *mgmt,
 953                                         size_t len)
 954 {
 955         u16 auth_alg, auth_transaction;
 956
 957         sdata_assert_lock(sdata);
 958
 959         if (len < 24 + 6)
 960                 return;
 961
 962         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
 963         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
 964
 965         ibss_dbg(sdata,
 966                  "RX Auth SA=%pM DA=%pM BSSID=%pM (auth_transaction=%d)\n",
 967                  mgmt->sa, mgmt->da, mgmt->bssid, auth_transaction);
 968
 969         if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
 970                 return;
 971
 972         /*
 973          * IEEE 802.11 standard does not require authentication in IBSS
 974          * networks and most implementations do not seem to use it.
 975          * However, try to reply to authentication attempts if someone
 976          * has actually implemented this.
 977          */
 978         ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, 0, NULL, 0,
 979                             mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0, 0);
 980 }
 981
 982 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
 983                                   struct ieee80211_mgmt *mgmt, size_t len,
 984                                   struct ieee80211_rx_status *rx_status,
 985                                   struct ieee802_11_elems *elems)
 986 {
 987         struct ieee80211_local *local = sdata->local;
 988         struct cfg80211_bss *cbss;
 989         struct ieee80211_bss *bss;
 990         struct sta_info *sta;
 991         struct ieee80211_channel *channel;
 992         u64 beacon_timestamp, rx_timestamp;
 993         u32 supp_rates = 0;
 994         enum ieee80211_band band = rx_status->band;
 995         enum nl80211_bss_scan_width scan_width;
 996         struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band];
 997         bool rates_updated = false;
 998
 999         channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
1000         if (!channel)
1001                 return;
1002
1003         if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
1004             ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid)) {
1005
1006                 rcu_read_lock();
1007                 sta = sta_info_get(sdata, mgmt->sa);
1008
1009                 if (elems->supp_rates) {
1010                         supp_rates = ieee80211_sta_get_rates(sdata, elems,
1011                                                              band, NULL);
1012                         if (sta) {
1013                                 u32 prev_rates;
1014
1015                                 prev_rates = sta->sta.supp_rates[band];
1016                                 /* make sure mandatory rates are always added */
1017                                 scan_width = NL80211_BSS_CHAN_WIDTH_20;
1018                                 if (rx_status->flag & RX_FLAG_5MHZ)
1019                                         scan_width = NL80211_BSS_CHAN_WIDTH_5;
1020                                 if (rx_status->flag & RX_FLAG_10MHZ)
1021                                         scan_width = NL80211_BSS_CHAN_WIDTH_10;
1022
1023                                 sta->sta.supp_rates[band] = supp_rates |
1024                                         ieee80211_mandatory_rates(sband,
1025                                                                   scan_width);
1026                                 if (sta->sta.supp_rates[band] != prev_rates) {
1027                                         ibss_dbg(sdata,
1028                                                  "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n",
1029                                                  sta->sta.addr, prev_rates,
1030                                                  sta->sta.supp_rates[band]);
1031                                         rates_updated = true;
1032                                 }
1033                         } else {
1034                                 rcu_read_unlock();
1035                                 sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid,
1036                                                 mgmt->sa, supp_rates);
1037                         }
1038                 }
1039
1040                 if (sta && elems->wmm_info)
1041                         set_sta_flag(sta, WLAN_STA_WME);
1042
1043                 if (sta && elems->ht_operation && elems->ht_cap_elem &&
1044                     sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20_NOHT &&
1045                     sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_5 &&
1046                     sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_10) {
1047                         /* we both use HT */
1048                         struct ieee80211_ht_cap htcap_ie;
1049                         struct cfg80211_chan_def chandef;
1050
1051                         ieee80211_ht_oper_to_chandef(channel,
1052                                                      elems->ht_operation,
1053                                                      &chandef);
1054
1055                         memcpy(&htcap_ie, elems->ht_cap_elem, sizeof(htcap_ie));
1056
1057                         /*
1058                          * fall back to HT20 if we don't use or use
1059                          * the other extension channel
1060                          */
1061                         if (chandef.center_freq1 !=
1062                             sdata->u.ibss.chandef.center_freq1)
1063                                 htcap_ie.cap_info &=
1064                                         cpu_to_le16(~IEEE80211_HT_CAP_SUP_WIDTH_20_40);
1065
1066                         rates_updated |= ieee80211_ht_cap_ie_to_sta_ht_cap(
1067                                                 sdata, sband, &htcap_ie, sta);
1068                 }
1069
1070                 if (sta && rates_updated) {
1071                         drv_sta_rc_update(local, sdata, &sta->sta,
1072                                           IEEE80211_RC_SUPP_RATES_CHANGED);
1073                         rate_control_rate_init(sta);
1074                 }
1075
1076                 rcu_read_unlock();
1077         }
1078
1079         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1080                                         channel);
1081         if (!bss)
1082                 return;
1083
1084         cbss = container_of((void *)bss, struct cfg80211_bss, priv);
1085
1086         /* same for beacon and probe response */
1087         beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp);
1088
1089         /* check if we need to merge IBSS */
1090
1091         /* not an IBSS */
1092         if (!(cbss->capability & WLAN_CAPABILITY_IBSS))
1093                 goto put_bss;
1094
1095         /* different channel */
1096         if (sdata->u.ibss.fixed_channel &&
1097             sdata->u.ibss.chandef.chan != cbss->channel)
1098                 goto put_bss;
1099
1100         /* different SSID */
1101         if (elems->ssid_len != sdata->u.ibss.ssid_len ||
1102             memcmp(elems->ssid, sdata->u.ibss.ssid,
1103                                 sdata->u.ibss.ssid_len))
1104                 goto put_bss;
1105
1106         /* process channel switch */
1107         if (sdata->vif.csa_active ||
1108             ieee80211_ibss_process_chanswitch(sdata, elems, true))
1109                 goto put_bss;
1110
1111         /* same BSSID */
1112         if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid))
1113                 goto put_bss;
1114
1115         /* we use a fixed BSSID */
1116         if (sdata->u.ibss.fixed_bssid)
1117                 goto put_bss;
1118
1119         if (ieee80211_have_rx_timestamp(rx_status)) {
1120                 /* time when timestamp field was received */
1121                 rx_timestamp =
1122                         ieee80211_calculate_rx_timestamp(local, rx_status,
1123                                                          len + FCS_LEN, 24);
1124         } else {
1125                 /*
1126                  * second best option: get current TSF
1127                  * (will return -1 if not supported)
1128                  */
1129                 rx_timestamp = drv_get_tsf(local, sdata);
1130         }
1131
1132         ibss_dbg(sdata,
1133                  "RX beacon SA=%pM BSSID=%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
1134                  mgmt->sa, mgmt->bssid,
1135                  (unsigned long long)rx_timestamp,
1136                  (unsigned long long)beacon_timestamp,
1137                  (unsigned long long)(rx_timestamp - beacon_timestamp),
1138                  jiffies);
1139
1140         if (beacon_timestamp > rx_timestamp) {
1141                 ibss_dbg(sdata,
1142                          "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n",
1143                          mgmt->bssid);
1144                 ieee80211_sta_join_ibss(sdata, bss);
1145                 supp_rates = ieee80211_sta_get_rates(sdata, elems, band, NULL);
1146                 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa,
1147                                        supp_rates);
1148                 rcu_read_unlock();
1149         }
1150
1151  put_bss:
1152         ieee80211_rx_bss_put(local, bss);
1153 }
1154
1155 void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata,
1156                               const u8 *bssid, const u8 *addr,
1157                               u32 supp_rates)
1158 {
1159         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1160         struct ieee80211_local *local = sdata->local;
1161         struct sta_info *sta;
1162         struct ieee80211_chanctx_conf *chanctx_conf;
1163         struct ieee80211_supported_band *sband;
1164         enum nl80211_bss_scan_width scan_width;
1165         int band;
1166
1167         /*
1168          * XXX: Consider removing the least recently used entry and
1169          *      allow new one to be added.
1170          */
1171         if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
1172                 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
1173                                     sdata->name, addr);
1174                 return;
1175         }
1176
1177         if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH)
1178                 return;
1179
1180         if (!ether_addr_equal(bssid, sdata->u.ibss.bssid))
1181                 return;
1182
1183         rcu_read_lock();
1184         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1185         if (WARN_ON_ONCE(!chanctx_conf)) {
1186                 rcu_read_unlock();
1187                 return;
1188         }
1189         band = chanctx_conf->def.chan->band;
1190         scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
1191         rcu_read_unlock();
1192
1193         sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
1194         if (!sta)
1195                 return;
1196
1197         sta->last_rx = jiffies;
1198
1199         /* make sure mandatory rates are always added */
1200         sband = local->hw.wiphy->bands[band];
1201         sta->sta.supp_rates[band] = supp_rates |
1202                         ieee80211_mandatory_rates(sband, scan_width);
1203
1204         spin_lock(&ifibss->incomplete_lock);
1205         list_add(&sta->list, &ifibss->incomplete_stations);
1206         spin_unlock(&ifibss->incomplete_lock);
1207         ieee80211_queue_work(&local->hw, &sdata->work);
1208 }
1209
1210 static void ieee80211_ibss_sta_expire(struct ieee80211_sub_if_data *sdata)
1211 {
1212         struct ieee80211_local *local = sdata->local;
1213         struct sta_info *sta, *tmp;
1214         unsigned long exp_time = IEEE80211_IBSS_INACTIVITY_LIMIT;
1215         unsigned long exp_rsn_time = IEEE80211_IBSS_RSN_INACTIVITY_LIMIT;
1216
1217         mutex_lock(&local->sta_mtx);
1218
1219         list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
1220                 if (sdata != sta->sdata)
1221                         continue;
1222
1223                 if (time_after(jiffies, sta->last_rx + exp_time) ||
1224                     (time_after(jiffies, sta->last_rx + exp_rsn_time) &&
1225                      sta->sta_state != IEEE80211_STA_AUTHORIZED)) {
1226                         sta_dbg(sta->sdata, "expiring inactive %sSTA %pM\n",
1227                                 sta->sta_state != IEEE80211_STA_AUTHORIZED ?
1228                                 "not authorized " : "", sta->sta.addr);
1229
1230                         WARN_ON(__sta_info_destroy(sta));
1231                 }
1232         }
1233
1234         mutex_unlock(&local->sta_mtx);
1235 }
1236
1237 /*
1238  * This function is called with state == IEEE80211_IBSS_MLME_JOINED
1239  */
1240
1241 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
1242 {
1243         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1244         enum nl80211_bss_scan_width scan_width;
1245
1246         sdata_assert_lock(sdata);
1247
1248         mod_timer(&ifibss->timer,
1249                   round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
1250
1251         ieee80211_ibss_sta_expire(sdata);
1252
1253         if (time_before(jiffies, ifibss->last_scan_completed +
1254                        IEEE80211_IBSS_MERGE_INTERVAL))
1255                 return;
1256
1257         if (ieee80211_sta_active_ibss(sdata))
1258                 return;
1259
1260         if (ifibss->fixed_channel)
1261                 return;
1262
1263         sdata_info(sdata,
1264                    "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n");
1265
1266         scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
1267         ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len,
1268                                     NULL, scan_width);
1269 }
1270
1271 static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
1272 {
1273         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1274         u8 bssid[ETH_ALEN];
1275         u16 capability;
1276         int i;
1277
1278         sdata_assert_lock(sdata);
1279
1280         if (ifibss->fixed_bssid) {
1281                 memcpy(bssid, ifibss->bssid, ETH_ALEN);
1282         } else {
1283                 /* Generate random, not broadcast, locally administered BSSID. Mix in
1284                  * own MAC address to make sure that devices that do not have proper
1285                  * random number generator get different BSSID. */
1286                 get_random_bytes(bssid, ETH_ALEN);
1287                 for (i = 0; i < ETH_ALEN; i++)
1288                         bssid[i] ^= sdata->vif.addr[i];
1289                 bssid[0] &= ~0x01;
1290                 bssid[0] |= 0x02;
1291         }
1292
1293         sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid);
1294
1295         capability = WLAN_CAPABILITY_IBSS;
1296
1297         if (ifibss->privacy)
1298                 capability |= WLAN_CAPABILITY_PRIVACY;
1299         else
1300                 sdata->drop_unencrypted = 0;
1301
1302         __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int,
1303                                   &ifibss->chandef, ifibss->basic_rates,
1304                                   capability, 0, true);
1305 }
1306
1307 /*
1308  * This function is called with state == IEEE80211_IBSS_MLME_SEARCH
1309  */
1310
1311 static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
1312 {
1313         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1314         struct ieee80211_local *local = sdata->local;
1315         struct cfg80211_bss *cbss;
1316         struct ieee80211_channel *chan = NULL;
1317         const u8 *bssid = NULL;
1318         enum nl80211_bss_scan_width scan_width;
1319         int active_ibss;
1320         u16 capability;
1321
1322         sdata_assert_lock(sdata);
1323
1324         active_ibss = ieee80211_sta_active_ibss(sdata);
1325         ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss);
1326
1327         if (active_ibss)
1328                 return;
1329
1330         capability = WLAN_CAPABILITY_IBSS;
1331         if (ifibss->privacy)
1332                 capability |= WLAN_CAPABILITY_PRIVACY;
1333         if (ifibss->fixed_bssid)
1334                 bssid = ifibss->bssid;
1335         if (ifibss->fixed_channel)
1336                 chan = ifibss->chandef.chan;
1337         if (!is_zero_ether_addr(ifibss->bssid))
1338                 bssid = ifibss->bssid;
1339         cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid,
1340                                 ifibss->ssid, ifibss->ssid_len,
1341                                 WLAN_CAPABILITY_IBSS | WLAN_CAPABILITY_PRIVACY,
1342                                 capability);
1343
1344         if (cbss) {
1345                 struct ieee80211_bss *bss;
1346
1347                 bss = (void *)cbss->priv;
1348                 ibss_dbg(sdata,
1349                          "sta_find_ibss: selected %pM current %pM\n",
1350                          cbss->bssid, ifibss->bssid);
1351                 sdata_info(sdata,
1352                            "Selected IBSS BSSID %pM based on configured SSID\n",
1353                            cbss->bssid);
1354
1355                 ieee80211_sta_join_ibss(sdata, bss);
1356                 ieee80211_rx_bss_put(local, bss);
1357                 return;
1358         }
1359
1360         /* if a fixed bssid and a fixed freq have been provided create the IBSS
1361          * directly and do not waste time scanning
1362          */
1363         if (ifibss->fixed_bssid && ifibss->fixed_channel) {
1364                 sdata_info(sdata, "Created IBSS using preconfigured BSSID %pM\n",
1365                            bssid);
1366                 ieee80211_sta_create_ibss(sdata);
1367                 return;
1368         }
1369
1370
1371         ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n");
1372
1373         /* Selected IBSS not found in current scan results - try to scan */
1374         if (time_after(jiffies, ifibss->last_scan_completed +
1375                                         IEEE80211_SCAN_INTERVAL)) {
1376                 sdata_info(sdata, "Trigger new scan to find an IBSS to join\n");
1377
1378                 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
1379                 ieee80211_request_ibss_scan(sdata, ifibss->ssid,
1380                                             ifibss->ssid_len, chan,
1381                                             scan_width);
1382         } else {
1383                 int interval = IEEE80211_SCAN_INTERVAL;
1384
1385                 if (time_after(jiffies, ifibss->ibss_join_req +
1386                                IEEE80211_IBSS_JOIN_TIMEOUT))
1387                         ieee80211_sta_create_ibss(sdata);
1388
1389                 mod_timer(&ifibss->timer,
1390                           round_jiffies(jiffies + interval));
1391         }
1392 }
1393
1394 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
1395                                         struct sk_buff *req)
1396 {
1397         struct ieee80211_mgmt *mgmt = (void *)req->data;
1398         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1399         struct ieee80211_local *local = sdata->local;
1400         int tx_last_beacon, len = req->len;
1401         struct sk_buff *skb;
1402         struct beacon_data *presp;
1403         u8 *pos, *end;
1404
1405         sdata_assert_lock(sdata);
1406
1407         presp = rcu_dereference_protected(ifibss->presp,
1408                                           lockdep_is_held(&sdata->wdev.mtx));
1409
1410         if (ifibss->state != IEEE80211_IBSS_MLME_JOINED ||
1411             len < 24 + 2 || !presp)
1412                 return;
1413
1414         tx_last_beacon = drv_tx_last_beacon(local);
1415
1416         ibss_dbg(sdata,
1417                  "RX ProbeReq SA=%pM DA=%pM BSSID=%pM (tx_last_beacon=%d)\n",
1418                  mgmt->sa, mgmt->da, mgmt->bssid, tx_last_beacon);
1419
1420         if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da))
1421                 return;
1422
1423         if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) &&
1424             !is_broadcast_ether_addr(mgmt->bssid))
1425                 return;
1426
1427         end = ((u8 *) mgmt) + len;
1428         pos = mgmt->u.probe_req.variable;
1429         if (pos[0] != WLAN_EID_SSID ||
1430             pos + 2 + pos[1] > end) {
1431                 ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n",
1432                          mgmt->sa);
1433                 return;
1434         }
1435         if (pos[1] != 0 &&
1436             (pos[1] != ifibss->ssid_len ||
1437              memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) {
1438                 /* Ignore ProbeReq for foreign SSID */
1439                 return;
1440         }
1441
1442         /* Reply with ProbeResp */
1443         skb = dev_alloc_skb(local->tx_headroom + presp->head_len);
1444         if (!skb)
1445                 return;
1446
1447         skb_reserve(skb, local->tx_headroom);
1448         memcpy(skb_put(skb, presp->head_len), presp->head, presp->head_len);
1449
1450         memcpy(((struct ieee80211_mgmt *) skb->data)->da, mgmt->sa, ETH_ALEN);
1451         ibss_dbg(sdata, "Sending ProbeResp to %pM\n", mgmt->sa);
1452         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1453
1454         /* avoid excessive retries for probe request to wildcard SSIDs */
1455         if (pos[1] == 0)
1456                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_NO_ACK;
1457
1458         ieee80211_tx_skb(sdata, skb);
1459 }
1460
1461 static
1462 void ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data *sdata,
1463                                     struct ieee80211_mgmt *mgmt, size_t len,
1464                                     struct ieee80211_rx_status *rx_status)
1465 {
1466         size_t baselen;
1467         struct ieee802_11_elems elems;
1468
1469         BUILD_BUG_ON(offsetof(typeof(mgmt->u.probe_resp), variable) !=
1470                      offsetof(typeof(mgmt->u.beacon), variable));
1471
1472         /*
1473          * either beacon or probe_resp but the variable field is at the
1474          * same offset
1475          */
1476         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1477         if (baselen > len)
1478                 return;
1479
1480         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1481                                false, &elems);
1482
1483         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
1484 }
1485
1486 void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1487                                    struct sk_buff *skb)
1488 {
1489         struct ieee80211_rx_status *rx_status;
1490         struct ieee80211_mgmt *mgmt;
1491         u16 fc;
1492         struct ieee802_11_elems elems;
1493         int ies_len;
1494
1495         rx_status = IEEE80211_SKB_RXCB(skb);
1496         mgmt = (struct ieee80211_mgmt *) skb->data;
1497         fc = le16_to_cpu(mgmt->frame_control);
1498
1499         sdata_lock(sdata);
1500
1501         if (!sdata->u.ibss.ssid_len)
1502                 goto mgmt_out; /* not ready to merge yet */
1503
1504         switch (fc & IEEE80211_FCTL_STYPE) {
1505         case IEEE80211_STYPE_PROBE_REQ:
1506                 ieee80211_rx_mgmt_probe_req(sdata, skb);
1507                 break;
1508         case IEEE80211_STYPE_PROBE_RESP:
1509         case IEEE80211_STYPE_BEACON:
1510                 ieee80211_rx_mgmt_probe_beacon(sdata, mgmt, skb->len,
1511                                                rx_status);
1512                 break;
1513         case IEEE80211_STYPE_AUTH:
1514                 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len);
1515                 break;
1516         case IEEE80211_STYPE_DEAUTH:
1517                 ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len);
1518                 break;
1519         case IEEE80211_STYPE_ACTION:
1520                 switch (mgmt->u.action.category) {
1521                 case WLAN_CATEGORY_SPECTRUM_MGMT:
1522                         ies_len = skb->len -
1523                                   offsetof(struct ieee80211_mgmt,
1524                                            u.action.u.chan_switch.variable);
1525
1526                         if (ies_len < 0)
1527                                 break;
1528
1529                         ieee802_11_parse_elems(
1530                                 mgmt->u.action.u.chan_switch.variable,
1531                                 ies_len, true, &elems);
1532
1533                         if (elems.parse_error)
1534                                 break;
1535
1536                         ieee80211_rx_mgmt_spectrum_mgmt(sdata, mgmt, skb->len,
1537                                                         rx_status, &elems);
1538                         break;
1539                 }
1540         }
1541
1542  mgmt_out:
1543         sdata_unlock(sdata);
1544 }
1545
1546 void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata)
1547 {
1548         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1549         struct sta_info *sta;
1550
1551         sdata_lock(sdata);
1552
1553         /*
1554          * Work could be scheduled after scan or similar
1555          * when we aren't even joined (or trying) with a
1556          * network.
1557          */
1558         if (!ifibss->ssid_len)
1559                 goto out;
1560
1561         spin_lock_bh(&ifibss->incomplete_lock);
1562         while (!list_empty(&ifibss->incomplete_stations)) {
1563                 sta = list_first_entry(&ifibss->incomplete_stations,
1564                                        struct sta_info, list);
1565                 list_del(&sta->list);
1566                 spin_unlock_bh(&ifibss->incomplete_lock);
1567
1568                 ieee80211_ibss_finish_sta(sta);
1569                 rcu_read_unlock();
1570                 spin_lock_bh(&ifibss->incomplete_lock);
1571         }
1572         spin_unlock_bh(&ifibss->incomplete_lock);
1573
1574         switch (ifibss->state) {
1575         case IEEE80211_IBSS_MLME_SEARCH:
1576                 ieee80211_sta_find_ibss(sdata);
1577                 break;
1578         case IEEE80211_IBSS_MLME_JOINED:
1579                 ieee80211_sta_merge_ibss(sdata);
1580                 break;
1581         default:
1582                 WARN_ON(1);
1583                 break;
1584         }
1585
1586  out:
1587         sdata_unlock(sdata);
1588 }
1589
1590 static void ieee80211_ibss_timer(unsigned long data)
1591 {
1592         struct ieee80211_sub_if_data *sdata =
1593                 (struct ieee80211_sub_if_data *) data;
1594
1595         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1596 }
1597
1598 void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata)
1599 {
1600         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1601
1602         setup_timer(&ifibss->timer, ieee80211_ibss_timer,
1603                     (unsigned long) sdata);
1604         INIT_LIST_HEAD(&ifibss->incomplete_stations);
1605         spin_lock_init(&ifibss->incomplete_lock);
1606         INIT_WORK(&ifibss->csa_connection_drop_work,
1607                   ieee80211_csa_connection_drop_work);
1608 }
1609
1610 /* scan finished notification */
1611 void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local)
1612 {
1613         struct ieee80211_sub_if_data *sdata;
1614
1615         mutex_lock(&local->iflist_mtx);
1616         list_for_each_entry(sdata, &local->interfaces, list) {
1617                 if (!ieee80211_sdata_running(sdata))
1618                         continue;
1619                 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
1620                         continue;
1621                 sdata->u.ibss.last_scan_completed = jiffies;
1622                 ieee80211_queue_work(&local->hw, &sdata->work);
1623         }
1624         mutex_unlock(&local->iflist_mtx);
1625 }
1626
1627 int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
1628                         struct cfg80211_ibss_params *params)
1629 {
1630         u32 changed = 0;
1631         u32 rate_flags;
1632         struct ieee80211_supported_band *sband;
1633         enum ieee80211_chanctx_mode chanmode;
1634         struct ieee80211_local *local = sdata->local;
1635         int radar_detect_width = 0;
1636         int i;
1637         int ret;
1638
1639         ret = cfg80211_chandef_dfs_required(local->hw.wiphy,
1640                                             &params->chandef,
1641                                             sdata->wdev.iftype);
1642         if (ret < 0)
1643                 return ret;
1644
1645         if (ret > 0) {
1646                 if (!params->userspace_handles_dfs)
1647                         return -EINVAL;
1648                 radar_detect_width = BIT(params->chandef.width);
1649         }
1650
1651         chanmode = (params->channel_fixed && !ret) ?
1652                 IEEE80211_CHANCTX_SHARED : IEEE80211_CHANCTX_EXCLUSIVE;
1653
1654         mutex_lock(&local->chanctx_mtx);
1655         ret = ieee80211_check_combinations(sdata, &params->chandef, chanmode,
1656                                            radar_detect_width);
1657         mutex_unlock(&local->chanctx_mtx);
1658         if (ret < 0)
1659                 return ret;
1660
1661         if (params->bssid) {
1662                 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN);
1663                 sdata->u.ibss.fixed_bssid = true;
1664         } else
1665                 sdata->u.ibss.fixed_bssid = false;
1666
1667         sdata->u.ibss.privacy = params->privacy;
1668         sdata->u.ibss.control_port = params->control_port;
1669         sdata->u.ibss.userspace_handles_dfs = params->userspace_handles_dfs;
1670         sdata->u.ibss.basic_rates = params->basic_rates;
1671         sdata->u.ibss.last_scan_completed = jiffies;
1672
1673         /* fix basic_rates if channel does not support these rates */
1674         rate_flags = ieee80211_chandef_rate_flags(&params->chandef);
1675         sband = local->hw.wiphy->bands[params->chandef.chan->band];
1676         for (i = 0; i < sband->n_bitrates; i++) {
1677                 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
1678                         sdata->u.ibss.basic_rates &= ~BIT(i);
1679         }
1680         memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate,
1681                sizeof(params->mcast_rate));
1682
1683         sdata->vif.bss_conf.beacon_int = params->beacon_interval;
1684
1685         sdata->u.ibss.chandef = params->chandef;
1686         sdata->u.ibss.fixed_channel = params->channel_fixed;
1687
1688         if (params->ie) {
1689                 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len,
1690                                            GFP_KERNEL);
1691                 if (sdata->u.ibss.ie)
1692                         sdata->u.ibss.ie_len = params->ie_len;
1693         }
1694
1695         sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
1696         sdata->u.ibss.ibss_join_req = jiffies;
1697
1698         memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len);
1699         sdata->u.ibss.ssid_len = params->ssid_len;
1700
1701         memcpy(&sdata->u.ibss.ht_capa, &params->ht_capa,
1702                sizeof(sdata->u.ibss.ht_capa));
1703         memcpy(&sdata->u.ibss.ht_capa_mask, &params->ht_capa_mask,
1704                sizeof(sdata->u.ibss.ht_capa_mask));
1705
1706         /*
1707          * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is
1708          * reserved, but an HT STA shall protect HT transmissions as though
1709          * the HT Protection field were set to non-HT mixed mode.
1710          *
1711          * In an IBSS, the RIFS Mode field of the HT Operation element is
1712          * also reserved, but an HT STA shall operate as though this field
1713          * were set to 1.
1714          */
1715
1716         sdata->vif.bss_conf.ht_operation_mode |=
1717                   IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED
1718                 | IEEE80211_HT_PARAM_RIFS_MODE;
1719
1720         changed |= BSS_CHANGED_HT;
1721         ieee80211_bss_info_change_notify(sdata, changed);
1722
1723         sdata->smps_mode = IEEE80211_SMPS_OFF;
1724         sdata->needed_rx_chains = local->rx_chains;
1725
1726         ieee80211_queue_work(&local->hw, &sdata->work);
1727
1728         return 0;
1729 }
1730
1731 int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata)
1732 {
1733         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1734
1735         ieee80211_ibss_disconnect(sdata);
1736         ifibss->ssid_len = 0;
1737         memset(ifibss->bssid, 0, ETH_ALEN);
1738
1739         /* remove beacon */
1740         kfree(sdata->u.ibss.ie);
1741
1742         /* on the next join, re-program HT parameters */
1743         memset(&ifibss->ht_capa, 0, sizeof(ifibss->ht_capa));
1744         memset(&ifibss->ht_capa_mask, 0, sizeof(ifibss->ht_capa_mask));
1745
1746         synchronize_rcu();
1747
1748         skb_queue_purge(&sdata->skb_queue);
1749
1750         del_timer_sync(&sdata->u.ibss.timer);
1751
1752         return 0;
1753 }