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  * Copyright(c) 2016 Intel Deutschland GmbH
  11  *
  12  * This program is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License version 2 as
  14  * published by the Free Software Foundation.
  15  */
  16
  17 #include <linux/delay.h>
  18 #include <linux/slab.h>
  19 #include <linux/if_ether.h>
  20 #include <linux/skbuff.h>
  21 #include <linux/if_arp.h>
  22 #include <linux/etherdevice.h>
  23 #include <linux/rtnetlink.h>
  24 #include <net/mac80211.h>
  25
  26 #include "ieee80211_i.h"
  27 #include "driver-ops.h"
  28 #include "rate.h"
  29
  30 #define IEEE80211_SCAN_INTERVAL (2 * HZ)
  31 #define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ)
  32
  33 #define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ)
  34 #define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ)
  35 #define IEEE80211_IBSS_RSN_INACTIVITY_LIMIT (10 * HZ)
  36
  37 #define IEEE80211_IBSS_MAX_STA_ENTRIES 128
  38
  39 static struct beacon_data *
  40 ieee80211_ibss_build_presp(struct ieee80211_sub_if_data *sdata,
  41                            const int beacon_int, const u32 basic_rates,
  42                            const u16 capability, u64 tsf,
  43                            struct cfg80211_chan_def *chandef,
  44                            bool *have_higher_than_11mbit,
  45                            struct cfg80211_csa_settings *csa_settings)
  46 {
  47         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
  48         struct ieee80211_local *local = sdata->local;
  49         int rates_n = 0, i, ri;
  50         struct ieee80211_mgmt *mgmt;
  51         u8 *pos;
  52         struct ieee80211_supported_band *sband;
  53         u32 rate_flags, rates = 0, rates_added = 0;
  54         struct beacon_data *presp;
  55         int frame_len;
  56         int shift;
  57
  58         /* Build IBSS probe response */
  59         frame_len = sizeof(struct ieee80211_hdr_3addr) +
  60                     12 /* struct ieee80211_mgmt.u.beacon */ +
  61                     2 + IEEE80211_MAX_SSID_LEN /* max SSID */ +
  62                     2 + 8 /* max Supported Rates */ +
  63                     3 /* max DS params */ +
  64                     4 /* IBSS params */ +
  65                     5 /* Channel Switch Announcement */ +
  66                     2 + (IEEE80211_MAX_SUPP_RATES - 8) +
  67                     2 + sizeof(struct ieee80211_ht_cap) +
  68                     2 + sizeof(struct ieee80211_ht_operation) +
  69                     2 + sizeof(struct ieee80211_vht_cap) +
  70                     2 + sizeof(struct ieee80211_vht_operation) +
  71                     ifibss->ie_len;
  72         presp = kzalloc(sizeof(*presp) + frame_len, GFP_KERNEL);
  73         if (!presp)
  74                 return NULL;
  75
  76         presp->head = (void *)(presp + 1);
  77
  78         mgmt = (void *) presp->head;
  79         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
  80                                           IEEE80211_STYPE_PROBE_RESP);
  81         eth_broadcast_addr(mgmt->da);
  82         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
  83         memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN);
  84         mgmt->u.beacon.beacon_int = cpu_to_le16(beacon_int);
  85         mgmt->u.beacon.timestamp = cpu_to_le64(tsf);
  86         mgmt->u.beacon.capab_info = cpu_to_le16(capability);
  87
  88         pos = (u8 *)mgmt + offsetof(struct ieee80211_mgmt, u.beacon.variable);
  89
  90         *pos++ = WLAN_EID_SSID;
  91         *pos++ = ifibss->ssid_len;
  92         memcpy(pos, ifibss->ssid, ifibss->ssid_len);
  93         pos += ifibss->ssid_len;
  94
  95         sband = local->hw.wiphy->bands[chandef->chan->band];
  96         rate_flags = ieee80211_chandef_rate_flags(chandef);
  97         shift = ieee80211_chandef_get_shift(chandef);
  98         rates_n = 0;
  99         if (have_higher_than_11mbit)
 100                 *have_higher_than_11mbit = false;
 101
 102         for (i = 0; i < sband->n_bitrates; i++) {
 103                 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
 104                         continue;
 105                 if (sband->bitrates[i].bitrate > 110 &&
 106                     have_higher_than_11mbit)
 107                         *have_higher_than_11mbit = true;
 108
 109                 rates |= BIT(i);
 110                 rates_n++;
 111         }
 112
 113         *pos++ = WLAN_EID_SUPP_RATES;
 114         *pos++ = min_t(int, 8, rates_n);
 115         for (ri = 0; ri < sband->n_bitrates; ri++) {
 116                 int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate,
 117                                         5 * (1 << shift));
 118                 u8 basic = 0;
 119                 if (!(rates & BIT(ri)))
 120                         continue;
 121
 122                 if (basic_rates & BIT(ri))
 123                         basic = 0x80;
 124                 *pos++ = basic | (u8) rate;
 125                 if (++rates_added == 8) {
 126                         ri++; /* continue at next rate for EXT_SUPP_RATES */
 127                         break;
 128                 }
 129         }
 130
 131         if (sband->band == NL80211_BAND_2GHZ) {
 132                 *pos++ = WLAN_EID_DS_PARAMS;
 133                 *pos++ = 1;
 134                 *pos++ = ieee80211_frequency_to_channel(
 135                                 chandef->chan->center_freq);
 136         }
 137
 138         *pos++ = WLAN_EID_IBSS_PARAMS;
 139         *pos++ = 2;
 140         /* FIX: set ATIM window based on scan results */
 141         *pos++ = 0;
 142         *pos++ = 0;
 143
 144         if (csa_settings) {
 145                 *pos++ = WLAN_EID_CHANNEL_SWITCH;
 146                 *pos++ = 3;
 147                 *pos++ = csa_settings->block_tx ? 1 : 0;
 148                 *pos++ = ieee80211_frequency_to_channel(
 149                                 csa_settings->chandef.chan->center_freq);
 150                 presp->csa_counter_offsets[0] = (pos - presp->head);
 151                 *pos++ = csa_settings->count;
 152                 presp->csa_current_counter = csa_settings->count;
 153         }
 154
 155         /* put the remaining rates in WLAN_EID_EXT_SUPP_RATES */
 156         if (rates_n > 8) {
 157                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 158                 *pos++ = rates_n - 8;
 159                 for (; ri < sband->n_bitrates; ri++) {
 160                         int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate,
 161                                                 5 * (1 << shift));
 162                         u8 basic = 0;
 163                         if (!(rates & BIT(ri)))
 164                                 continue;
 165
 166                         if (basic_rates & BIT(ri))
 167                                 basic = 0x80;
 168                         *pos++ = basic | (u8) rate;
 169                 }
 170         }
 171
 172         if (ifibss->ie_len) {
 173                 memcpy(pos, ifibss->ie, ifibss->ie_len);
 174                 pos += ifibss->ie_len;
 175         }
 176
 177         /* add HT capability and information IEs */
 178         if (chandef->width != NL80211_CHAN_WIDTH_20_NOHT &&
 179             chandef->width != NL80211_CHAN_WIDTH_5 &&
 180             chandef->width != NL80211_CHAN_WIDTH_10 &&
 181             sband->ht_cap.ht_supported) {
 182                 struct ieee80211_sta_ht_cap ht_cap;
 183
 184                 memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
 185                 ieee80211_apply_htcap_overrides(sdata, &ht_cap);
 186
 187                 pos = ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap);
 188                 /*
 189                  * Note: According to 802.11n-2009 9.13.3.1, HT Protection
 190                  * field and RIFS Mode are reserved in IBSS mode, therefore
 191                  * keep them at 0
 192                  */
 193                 pos = ieee80211_ie_build_ht_oper(pos, &sband->ht_cap,
 194                                                  chandef, 0, false);
 195
 196                 /* add VHT capability and information IEs */
 197                 if (chandef->width != NL80211_CHAN_WIDTH_20 &&
 198                     chandef->width != NL80211_CHAN_WIDTH_40 &&
 199                     sband->vht_cap.vht_supported) {
 200                         pos = ieee80211_ie_build_vht_cap(pos, &sband->vht_cap,
 201                                                          sband->vht_cap.cap);
 202                         pos = ieee80211_ie_build_vht_oper(pos, &sband->vht_cap,
 203                                                           chandef);
 204                 }
 205         }
 206
 207         if (local->hw.queues >= IEEE80211_NUM_ACS)
 208                 pos = ieee80211_add_wmm_info_ie(pos, 0); /* U-APSD not in use */
 209
 210         presp->head_len = pos - presp->head;
 211         if (WARN_ON(presp->head_len > frame_len))
 212                 goto error;
 213
 214         return presp;
 215 error:
 216         kfree(presp);
 217         return NULL;
 218 }
 219
 220 static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
 221                                       const u8 *bssid, const int beacon_int,
 222                                       struct cfg80211_chan_def *req_chandef,
 223                                       const u32 basic_rates,
 224                                       const u16 capability, u64 tsf,
 225                                       bool creator)
 226 {
 227         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 228         struct ieee80211_local *local = sdata->local;
 229         struct ieee80211_mgmt *mgmt;
 230         struct cfg80211_bss *bss;
 231         u32 bss_change;
 232         struct cfg80211_chan_def chandef;
 233         struct ieee80211_channel *chan;
 234         struct beacon_data *presp;
 235         struct cfg80211_inform_bss bss_meta = {};
 236         bool have_higher_than_11mbit;
 237         bool radar_required;
 238         int err;
 239
 240         sdata_assert_lock(sdata);
 241
 242         /* Reset own TSF to allow time synchronization work. */
 243         drv_reset_tsf(local, sdata);
 244
 245         if (!ether_addr_equal(ifibss->bssid, bssid))
 246                 sta_info_flush(sdata);
 247
 248         /* if merging, indicate to driver that we leave the old IBSS */
 249         if (sdata->vif.bss_conf.ibss_joined) {
 250                 sdata->vif.bss_conf.ibss_joined = false;
 251                 sdata->vif.bss_conf.ibss_creator = false;
 252                 sdata->vif.bss_conf.enable_beacon = false;
 253                 netif_carrier_off(sdata->dev);
 254                 ieee80211_bss_info_change_notify(sdata,
 255                                                  BSS_CHANGED_IBSS |
 256                                                  BSS_CHANGED_BEACON_ENABLED);
 257                 drv_leave_ibss(local, sdata);
 258         }
 259
 260         presp = rcu_dereference_protected(ifibss->presp,
 261                                           lockdep_is_held(&sdata->wdev.mtx));
 262         RCU_INIT_POINTER(ifibss->presp, NULL);
 263         if (presp)
 264                 kfree_rcu(presp, rcu_head);
 265
 266         /* make a copy of the chandef, it could be modified below. */
 267         chandef = *req_chandef;
 268         chan = chandef.chan;
 269         if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef,
 270                                      NL80211_IFTYPE_ADHOC)) {
 271                 if (chandef.width == NL80211_CHAN_WIDTH_5 ||
 272                     chandef.width == NL80211_CHAN_WIDTH_10 ||
 273                     chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
 274                     chandef.width == NL80211_CHAN_WIDTH_20) {
 275                         sdata_info(sdata,
 276                                    "Failed to join IBSS, beacons forbidden\n");
 277                         return;
 278                 }
 279                 chandef.width = NL80211_CHAN_WIDTH_20;
 280                 chandef.center_freq1 = chan->center_freq;
 281                 /* check again for downgraded chandef */
 282                 if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef,
 283                                              NL80211_IFTYPE_ADHOC)) {
 284                         sdata_info(sdata,
 285                                    "Failed to join IBSS, beacons forbidden\n");
 286                         return;
 287                 }
 288         }
 289
 290         err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
 291                                             &chandef, NL80211_IFTYPE_ADHOC);
 292         if (err < 0) {
 293                 sdata_info(sdata,
 294                            "Failed to join IBSS, invalid chandef\n");
 295                 return;
 296         }
 297         if (err > 0 && !ifibss->userspace_handles_dfs) {
 298                 sdata_info(sdata,
 299                            "Failed to join IBSS, DFS channel without control program\n");
 300                 return;
 301         }
 302
 303         radar_required = err;
 304
 305         mutex_lock(&local->mtx);
 306         if (ieee80211_vif_use_channel(sdata, &chandef,
 307                                       ifibss->fixed_channel ?
 308                                         IEEE80211_CHANCTX_SHARED :
 309                                         IEEE80211_CHANCTX_EXCLUSIVE)) {
 310                 sdata_info(sdata, "Failed to join IBSS, no channel context\n");
 311                 mutex_unlock(&local->mtx);
 312                 return;
 313         }
 314         sdata->radar_required = radar_required;
 315         mutex_unlock(&local->mtx);
 316
 317         memcpy(ifibss->bssid, bssid, ETH_ALEN);
 318
 319         presp = ieee80211_ibss_build_presp(sdata, beacon_int, basic_rates,
 320                                            capability, tsf, &chandef,
 321                                            &have_higher_than_11mbit, NULL);
 322         if (!presp)
 323                 return;
 324
 325         rcu_assign_pointer(ifibss->presp, presp);
 326         mgmt = (void *)presp->head;
 327
 328         sdata->vif.bss_conf.enable_beacon = true;
 329         sdata->vif.bss_conf.beacon_int = beacon_int;
 330         sdata->vif.bss_conf.basic_rates = basic_rates;
 331         sdata->vif.bss_conf.ssid_len = ifibss->ssid_len;
 332         memcpy(sdata->vif.bss_conf.ssid, ifibss->ssid, ifibss->ssid_len);
 333         bss_change = BSS_CHANGED_BEACON_INT;
 334         bss_change |= ieee80211_reset_erp_info(sdata);
 335         bss_change |= BSS_CHANGED_BSSID;
 336         bss_change |= BSS_CHANGED_BEACON;
 337         bss_change |= BSS_CHANGED_BEACON_ENABLED;
 338         bss_change |= BSS_CHANGED_BASIC_RATES;
 339         bss_change |= BSS_CHANGED_HT;
 340         bss_change |= BSS_CHANGED_IBSS;
 341         bss_change |= BSS_CHANGED_SSID;
 342
 343         /*
 344          * In 5 GHz/802.11a, we can always use short slot time.
 345          * (IEEE 802.11-2012 18.3.8.7)
 346          *
 347          * In 2.4GHz, we must always use long slots in IBSS for compatibility
 348          * reasons.
 349          * (IEEE 802.11-2012 19.4.5)
 350          *
 351          * HT follows these specifications (IEEE 802.11-2012 20.3.18)
 352          */
 353         sdata->vif.bss_conf.use_short_slot = chan->band == NL80211_BAND_5GHZ;
 354         bss_change |= BSS_CHANGED_ERP_SLOT;
 355
 356         /* cf. IEEE 802.11 9.2.12 */
 357         if (chan->band == NL80211_BAND_2GHZ && have_higher_than_11mbit)
 358                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
 359         else
 360                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
 361
 362         ieee80211_set_wmm_default(sdata, true, false);
 363
 364         sdata->vif.bss_conf.ibss_joined = true;
 365         sdata->vif.bss_conf.ibss_creator = creator;
 366
 367         err = drv_join_ibss(local, sdata);
 368         if (err) {
 369                 sdata->vif.bss_conf.ibss_joined = false;
 370                 sdata->vif.bss_conf.ibss_creator = false;
 371                 sdata->vif.bss_conf.enable_beacon = false;
 372                 sdata->vif.bss_conf.ssid_len = 0;
 373                 RCU_INIT_POINTER(ifibss->presp, NULL);
 374                 kfree_rcu(presp, rcu_head);
 375                 mutex_lock(&local->mtx);
 376                 ieee80211_vif_release_channel(sdata);
 377                 mutex_unlock(&local->mtx);
 378                 sdata_info(sdata, "Failed to join IBSS, driver failure: %d\n",
 379                            err);
 380                 return;
 381         }
 382
 383         ieee80211_bss_info_change_notify(sdata, bss_change);
 384
 385         ifibss->state = IEEE80211_IBSS_MLME_JOINED;
 386         mod_timer(&ifibss->timer,
 387                   round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
 388
 389         bss_meta.chan = chan;
 390         bss_meta.scan_width = cfg80211_chandef_to_scan_width(&chandef);
 391         bss = cfg80211_inform_bss_frame_data(local->hw.wiphy, &bss_meta, mgmt,
 392                                              presp->head_len, GFP_KERNEL);
 393
 394         cfg80211_put_bss(local->hw.wiphy, bss);
 395         netif_carrier_on(sdata->dev);
 396         cfg80211_ibss_joined(sdata->dev, ifibss->bssid, chan, GFP_KERNEL);
 397 }
 398
 399 static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
 400                                     struct ieee80211_bss *bss)
 401 {
 402         struct cfg80211_bss *cbss =
 403                 container_of((void *)bss, struct cfg80211_bss, priv);
 404         struct ieee80211_supported_band *sband;
 405         struct cfg80211_chan_def chandef;
 406         u32 basic_rates;
 407         int i, j;
 408         u16 beacon_int = cbss->beacon_interval;
 409         const struct cfg80211_bss_ies *ies;
 410         enum nl80211_channel_type chan_type;
 411         u64 tsf;
 412         u32 rate_flags;
 413         int shift;
 414
 415         sdata_assert_lock(sdata);
 416
 417         if (beacon_int < 10)
 418                 beacon_int = 10;
 419
 420         switch (sdata->u.ibss.chandef.width) {
 421         case NL80211_CHAN_WIDTH_20_NOHT:
 422         case NL80211_CHAN_WIDTH_20:
 423         case NL80211_CHAN_WIDTH_40:
 424                 chan_type = cfg80211_get_chandef_type(&sdata->u.ibss.chandef);
 425                 cfg80211_chandef_create(&chandef, cbss->channel, chan_type);
 426                 break;
 427         case NL80211_CHAN_WIDTH_5:
 428         case NL80211_CHAN_WIDTH_10:
 429                 cfg80211_chandef_create(&chandef, cbss->channel,
 430                                         NL80211_CHAN_NO_HT);
 431                 chandef.width = sdata->u.ibss.chandef.width;
 432                 break;
 433         case NL80211_CHAN_WIDTH_80:
 434         case NL80211_CHAN_WIDTH_80P80:
 435         case NL80211_CHAN_WIDTH_160:
 436                 chandef = sdata->u.ibss.chandef;
 437                 chandef.chan = cbss->channel;
 438                 break;
 439         default:
 440                 /* fall back to 20 MHz for unsupported modes */
 441                 cfg80211_chandef_create(&chandef, cbss->channel,
 442                                         NL80211_CHAN_NO_HT);
 443                 break;
 444         }
 445
 446         sband = sdata->local->hw.wiphy->bands[cbss->channel->band];
 447         rate_flags = ieee80211_chandef_rate_flags(&sdata->u.ibss.chandef);
 448         shift = ieee80211_vif_get_shift(&sdata->vif);
 449
 450         basic_rates = 0;
 451
 452         for (i = 0; i < bss->supp_rates_len; i++) {
 453                 int rate = bss->supp_rates[i] & 0x7f;
 454                 bool is_basic = !!(bss->supp_rates[i] & 0x80);
 455
 456                 for (j = 0; j < sband->n_bitrates; j++) {
 457                         int brate;
 458                         if ((rate_flags & sband->bitrates[j].flags)
 459                             != rate_flags)
 460                                 continue;
 461
 462                         brate = DIV_ROUND_UP(sband->bitrates[j].bitrate,
 463                                              5 * (1 << shift));
 464                         if (brate == rate) {
 465                                 if (is_basic)
 466                                         basic_rates |= BIT(j);
 467                                 break;
 468                         }
 469                 }
 470         }
 471
 472         rcu_read_lock();
 473         ies = rcu_dereference(cbss->ies);
 474         tsf = ies->tsf;
 475         rcu_read_unlock();
 476
 477         __ieee80211_sta_join_ibss(sdata, cbss->bssid,
 478                                   beacon_int,
 479                                   &chandef,
 480                                   basic_rates,
 481                                   cbss->capability,
 482                                   tsf, false);
 483 }
 484
 485 int ieee80211_ibss_csa_beacon(struct ieee80211_sub_if_data *sdata,
 486                               struct cfg80211_csa_settings *csa_settings)
 487 {
 488         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 489         struct beacon_data *presp, *old_presp;
 490         struct cfg80211_bss *cbss;
 491         const struct cfg80211_bss_ies *ies;
 492         u16 capability = WLAN_CAPABILITY_IBSS;
 493         u64 tsf;
 494         int ret = 0;
 495
 496         sdata_assert_lock(sdata);
 497
 498         if (ifibss->privacy)
 499                 capability |= WLAN_CAPABILITY_PRIVACY;
 500
 501         cbss = cfg80211_get_bss(sdata->local->hw.wiphy, ifibss->chandef.chan,
 502                                 ifibss->bssid, ifibss->ssid,
 503                                 ifibss->ssid_len, IEEE80211_BSS_TYPE_IBSS,
 504                                 IEEE80211_PRIVACY(ifibss->privacy));
 505
 506         if (WARN_ON(!cbss)) {
 507                 ret = -EINVAL;
 508                 goto out;
 509         }
 510
 511         rcu_read_lock();
 512         ies = rcu_dereference(cbss->ies);
 513         tsf = ies->tsf;
 514         rcu_read_unlock();
 515         cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
 516
 517         old_presp = rcu_dereference_protected(ifibss->presp,
 518                                           lockdep_is_held(&sdata->wdev.mtx));
 519
 520         presp = ieee80211_ibss_build_presp(sdata,
 521                                            sdata->vif.bss_conf.beacon_int,
 522                                            sdata->vif.bss_conf.basic_rates,
 523                                            capability, tsf, &ifibss->chandef,
 524                                            NULL, csa_settings);
 525         if (!presp) {
 526                 ret = -ENOMEM;
 527                 goto out;
 528         }
 529
 530         rcu_assign_pointer(ifibss->presp, presp);
 531         if (old_presp)
 532                 kfree_rcu(old_presp, rcu_head);
 533
 534         return BSS_CHANGED_BEACON;
 535  out:
 536         return ret;
 537 }
 538
 539 int ieee80211_ibss_finish_csa(struct ieee80211_sub_if_data *sdata)
 540 {
 541         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 542         struct cfg80211_bss *cbss;
 543         int err, changed = 0;
 544
 545         sdata_assert_lock(sdata);
 546
 547         /* When not connected/joined, sending CSA doesn't make sense. */
 548         if (ifibss->state != IEEE80211_IBSS_MLME_JOINED)
 549                 return -ENOLINK;
 550
 551         /* update cfg80211 bss information with the new channel */
 552         if (!is_zero_ether_addr(ifibss->bssid)) {
 553                 cbss = cfg80211_get_bss(sdata->local->hw.wiphy,
 554                                         ifibss->chandef.chan,
 555                                         ifibss->bssid, ifibss->ssid,
 556                                         ifibss->ssid_len,
 557                                         IEEE80211_BSS_TYPE_IBSS,
 558                                         IEEE80211_PRIVACY(ifibss->privacy));
 559                 /* XXX: should not really modify cfg80211 data */
 560                 if (cbss) {
 561                         cbss->channel = sdata->csa_chandef.chan;
 562                         cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
 563                 }
 564         }
 565
 566         ifibss->chandef = sdata->csa_chandef;
 567
 568         /* generate the beacon */
 569         err = ieee80211_ibss_csa_beacon(sdata, NULL);
 570         if (err < 0)
 571                 return err;
 572
 573         changed |= err;
 574
 575         return changed;
 576 }
 577
 578 void ieee80211_ibss_stop(struct ieee80211_sub_if_data *sdata)
 579 {
 580         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 581
 582         cancel_work_sync(&ifibss->csa_connection_drop_work);
 583 }
 584
 585 static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta)
 586         __acquires(RCU)
 587 {
 588         struct ieee80211_sub_if_data *sdata = sta->sdata;
 589         u8 addr[ETH_ALEN];
 590
 591         memcpy(addr, sta->sta.addr, ETH_ALEN);
 592
 593         ibss_dbg(sdata, "Adding new IBSS station %pM\n", addr);
 594
 595         sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
 596         sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
 597         /* authorize the station only if the network is not RSN protected. If
 598          * not wait for the userspace to authorize it */
 599         if (!sta->sdata->u.ibss.control_port)
 600                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
 601
 602         rate_control_rate_init(sta);
 603
 604         /* If it fails, maybe we raced another insertion? */
 605         if (sta_info_insert_rcu(sta))
 606                 return sta_info_get(sdata, addr);
 607         return sta;
 608 }
 609
 610 static struct sta_info *
 611 ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, const u8 *bssid,
 612                        const u8 *addr, u32 supp_rates)
 613         __acquires(RCU)
 614 {
 615         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 616         struct ieee80211_local *local = sdata->local;
 617         struct sta_info *sta;
 618         struct ieee80211_chanctx_conf *chanctx_conf;
 619         struct ieee80211_supported_band *sband;
 620         enum nl80211_bss_scan_width scan_width;
 621         int band;
 622
 623         /*
 624          * XXX: Consider removing the least recently used entry and
 625          *      allow new one to be added.
 626          */
 627         if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
 628                 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
 629                                     sdata->name, addr);
 630                 rcu_read_lock();
 631                 return NULL;
 632         }
 633
 634         if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) {
 635                 rcu_read_lock();
 636                 return NULL;
 637         }
 638
 639         if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) {
 640                 rcu_read_lock();
 641                 return NULL;
 642         }
 643
 644         rcu_read_lock();
 645         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 646         if (WARN_ON_ONCE(!chanctx_conf))
 647                 return NULL;
 648         band = chanctx_conf->def.chan->band;
 649         scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
 650         rcu_read_unlock();
 651
 652         sta = sta_info_alloc(sdata, addr, GFP_KERNEL);
 653         if (!sta) {
 654                 rcu_read_lock();
 655                 return NULL;
 656         }
 657
 658         /* make sure mandatory rates are always added */
 659         sband = local->hw.wiphy->bands[band];
 660         sta->sta.supp_rates[band] = supp_rates |
 661                         ieee80211_mandatory_rates(sband, scan_width);
 662
 663         return ieee80211_ibss_finish_sta(sta);
 664 }
 665
 666 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
 667 {
 668         struct ieee80211_local *local = sdata->local;
 669         int active = 0;
 670         struct sta_info *sta;
 671
 672         sdata_assert_lock(sdata);
 673
 674         rcu_read_lock();
 675
 676         list_for_each_entry_rcu(sta, &local->sta_list, list) {
 677                 unsigned long last_active = ieee80211_sta_last_active(sta);
 678
 679                 if (sta->sdata == sdata &&
 680                     time_is_after_jiffies(last_active +
 681                                           IEEE80211_IBSS_MERGE_INTERVAL)) {
 682                         active++;
 683                         break;
 684                 }
 685         }
 686
 687         rcu_read_unlock();
 688
 689         return active;
 690 }
 691
 692 static void ieee80211_ibss_disconnect(struct ieee80211_sub_if_data *sdata)
 693 {
 694         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 695         struct ieee80211_local *local = sdata->local;
 696         struct cfg80211_bss *cbss;
 697         struct beacon_data *presp;
 698         struct sta_info *sta;
 699
 700         if (!is_zero_ether_addr(ifibss->bssid)) {
 701                 cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->chandef.chan,
 702                                         ifibss->bssid, ifibss->ssid,
 703                                         ifibss->ssid_len,
 704                                         IEEE80211_BSS_TYPE_IBSS,
 705                                         IEEE80211_PRIVACY(ifibss->privacy));
 706
 707                 if (cbss) {
 708                         cfg80211_unlink_bss(local->hw.wiphy, cbss);
 709                         cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
 710                 }
 711         }
 712
 713         ifibss->state = IEEE80211_IBSS_MLME_SEARCH;
 714
 715         sta_info_flush(sdata);
 716
 717         spin_lock_bh(&ifibss->incomplete_lock);
 718         while (!list_empty(&ifibss->incomplete_stations)) {
 719                 sta = list_first_entry(&ifibss->incomplete_stations,
 720                                        struct sta_info, list);
 721                 list_del(&sta->list);
 722                 spin_unlock_bh(&ifibss->incomplete_lock);
 723
 724                 sta_info_free(local, sta);
 725                 spin_lock_bh(&ifibss->incomplete_lock);
 726         }
 727         spin_unlock_bh(&ifibss->incomplete_lock);
 728
 729         netif_carrier_off(sdata->dev);
 730
 731         sdata->vif.bss_conf.ibss_joined = false;
 732         sdata->vif.bss_conf.ibss_creator = false;
 733         sdata->vif.bss_conf.enable_beacon = false;
 734         sdata->vif.bss_conf.ssid_len = 0;
 735
 736         /* remove beacon */
 737         presp = rcu_dereference_protected(ifibss->presp,
 738                                           lockdep_is_held(&sdata->wdev.mtx));
 739         RCU_INIT_POINTER(sdata->u.ibss.presp, NULL);
 740         if (presp)
 741                 kfree_rcu(presp, rcu_head);
 742
 743         clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state);
 744         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED |
 745                                                 BSS_CHANGED_IBSS);
 746         drv_leave_ibss(local, sdata);
 747         mutex_lock(&local->mtx);
 748         ieee80211_vif_release_channel(sdata);
 749         mutex_unlock(&local->mtx);
 750 }
 751
 752 static void ieee80211_csa_connection_drop_work(struct work_struct *work)
 753 {
 754         struct ieee80211_sub_if_data *sdata =
 755                 container_of(work, struct ieee80211_sub_if_data,
 756                              u.ibss.csa_connection_drop_work);
 757
 758         sdata_lock(sdata);
 759
 760         ieee80211_ibss_disconnect(sdata);
 761         synchronize_rcu();
 762         skb_queue_purge(&sdata->skb_queue);
 763
 764         /* trigger a scan to find another IBSS network to join */
 765         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
 766
 767         sdata_unlock(sdata);
 768 }
 769
 770 static void ieee80211_ibss_csa_mark_radar(struct ieee80211_sub_if_data *sdata)
 771 {
 772         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 773         int err;
 774
 775         /* if the current channel is a DFS channel, mark the channel as
 776          * unavailable.
 777          */
 778         err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
 779                                             &ifibss->chandef,
 780                                             NL80211_IFTYPE_ADHOC);
 781         if (err > 0)
 782                 cfg80211_radar_event(sdata->local->hw.wiphy, &ifibss->chandef,
 783                                      GFP_ATOMIC);
 784 }
 785
 786 static bool
 787 ieee80211_ibss_process_chanswitch(struct ieee80211_sub_if_data *sdata,
 788                                   struct ieee802_11_elems *elems,
 789                                   bool beacon)
 790 {
 791         struct cfg80211_csa_settings params;
 792         struct ieee80211_csa_ie csa_ie;
 793         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 794         enum nl80211_channel_type ch_type;
 795         int err;
 796         u32 sta_flags;
 797
 798         sdata_assert_lock(sdata);
 799
 800         sta_flags = IEEE80211_STA_DISABLE_VHT;
 801         switch (ifibss->chandef.width) {
 802         case NL80211_CHAN_WIDTH_5:
 803         case NL80211_CHAN_WIDTH_10:
 804         case NL80211_CHAN_WIDTH_20_NOHT:
 805                 sta_flags |= IEEE80211_STA_DISABLE_HT;
 806                 /* fall through */
 807         case NL80211_CHAN_WIDTH_20:
 808                 sta_flags |= IEEE80211_STA_DISABLE_40MHZ;
 809                 break;
 810         default:
 811                 break;
 812         }
 813
 814         memset(&params, 0, sizeof(params));
 815         err = ieee80211_parse_ch_switch_ie(sdata, elems,
 816                                            ifibss->chandef.chan->band,
 817                                            sta_flags, ifibss->bssid, &csa_ie);
 818         /* can't switch to destination channel, fail */
 819         if (err < 0)
 820                 goto disconnect;
 821
 822         /* did not contain a CSA */
 823         if (err)
 824                 return false;
 825
 826         /* channel switch is not supported, disconnect */
 827         if (!(sdata->local->hw.wiphy->flags & WIPHY_FLAG_HAS_CHANNEL_SWITCH))
 828                 goto disconnect;
 829
 830         params.count = csa_ie.count;
 831         params.chandef = csa_ie.chandef;
 832
 833         switch (ifibss->chandef.width) {
 834         case NL80211_CHAN_WIDTH_20_NOHT:
 835         case NL80211_CHAN_WIDTH_20:
 836         case NL80211_CHAN_WIDTH_40:
 837                 /* keep our current HT mode (HT20/HT40+/HT40-), even if
 838                  * another mode  has been announced. The mode is not adopted
 839                  * within the beacon while doing CSA and we should therefore
 840                  * keep the mode which we announce.
 841                  */
 842                 ch_type = cfg80211_get_chandef_type(&ifibss->chandef);
 843                 cfg80211_chandef_create(&params.chandef, params.chandef.chan,
 844                                         ch_type);
 845                 break;
 846         case NL80211_CHAN_WIDTH_5:
 847         case NL80211_CHAN_WIDTH_10:
 848                 if (params.chandef.width != ifibss->chandef.width) {
 849                         sdata_info(sdata,
 850                                    "IBSS %pM received channel switch from incompatible channel width (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
 851                                    ifibss->bssid,
 852                                    params.chandef.chan->center_freq,
 853                                    params.chandef.width,
 854                                    params.chandef.center_freq1,
 855                                    params.chandef.center_freq2);
 856                         goto disconnect;
 857                 }
 858                 break;
 859         default:
 860                 /* should not happen, sta_flags should prevent VHT modes. */
 861                 WARN_ON(1);
 862                 goto disconnect;
 863         }
 864
 865         if (!cfg80211_reg_can_beacon(sdata->local->hw.wiphy, &params.chandef,
 866                                      NL80211_IFTYPE_ADHOC)) {
 867                 sdata_info(sdata,
 868                            "IBSS %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
 869                            ifibss->bssid,
 870                            params.chandef.chan->center_freq,
 871                            params.chandef.width,
 872                            params.chandef.center_freq1,
 873                            params.chandef.center_freq2);
 874                 goto disconnect;
 875         }
 876
 877         err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
 878                                             &params.chandef,
 879                                             NL80211_IFTYPE_ADHOC);
 880         if (err < 0)
 881                 goto disconnect;
 882         if (err > 0 && !ifibss->userspace_handles_dfs) {
 883                 /* IBSS-DFS only allowed with a control program */
 884                 goto disconnect;
 885         }
 886
 887         params.radar_required = err;
 888
 889         if (cfg80211_chandef_identical(&params.chandef,
 890                                        &sdata->vif.bss_conf.chandef)) {
 891                 ibss_dbg(sdata,
 892                          "received csa with an identical chandef, ignoring\n");
 893                 return true;
 894         }
 895
 896         /* all checks done, now perform the channel switch. */
 897         ibss_dbg(sdata,
 898                  "received channel switch announcement to go to channel %d MHz\n",
 899                  params.chandef.chan->center_freq);
 900
 901         params.block_tx = !!csa_ie.mode;
 902
 903         if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev,
 904                                      &params))
 905                 goto disconnect;
 906
 907         ieee80211_ibss_csa_mark_radar(sdata);
 908
 909         return true;
 910 disconnect:
 911         ibss_dbg(sdata, "Can't handle channel switch, disconnect\n");
 912         ieee80211_queue_work(&sdata->local->hw,
 913                              &ifibss->csa_connection_drop_work);
 914
 915         ieee80211_ibss_csa_mark_radar(sdata);
 916
 917         return true;
 918 }
 919
 920 static void
 921 ieee80211_rx_mgmt_spectrum_mgmt(struct ieee80211_sub_if_data *sdata,
 922                                 struct ieee80211_mgmt *mgmt, size_t len,
 923                                 struct ieee80211_rx_status *rx_status,
 924                                 struct ieee802_11_elems *elems)
 925 {
 926         int required_len;
 927
 928         if (len < IEEE80211_MIN_ACTION_SIZE + 1)
 929                 return;
 930
 931         /* CSA is the only action we handle for now */
 932         if (mgmt->u.action.u.measurement.action_code !=
 933             WLAN_ACTION_SPCT_CHL_SWITCH)
 934                 return;
 935
 936         required_len = IEEE80211_MIN_ACTION_SIZE +
 937                        sizeof(mgmt->u.action.u.chan_switch);
 938         if (len < required_len)
 939                 return;
 940
 941         if (!sdata->vif.csa_active)
 942                 ieee80211_ibss_process_chanswitch(sdata, elems, false);
 943 }
 944
 945 static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data *sdata,
 946                                           struct ieee80211_mgmt *mgmt,
 947                                           size_t len)
 948 {
 949         u16 reason = le16_to_cpu(mgmt->u.deauth.reason_code);
 950
 951         if (len < IEEE80211_DEAUTH_FRAME_LEN)
 952                 return;
 953
 954         ibss_dbg(sdata, "RX DeAuth SA=%pM DA=%pM\n", mgmt->sa, mgmt->da);
 955         ibss_dbg(sdata, "\tBSSID=%pM (reason: %d)\n", mgmt->bssid, reason);
 956         sta_info_destroy_addr(sdata, mgmt->sa);
 957 }
 958
 959 static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata,
 960                                         struct ieee80211_mgmt *mgmt,
 961                                         size_t len)
 962 {
 963         u16 auth_alg, auth_transaction;
 964
 965         sdata_assert_lock(sdata);
 966
 967         if (len < 24 + 6)
 968                 return;
 969
 970         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
 971         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
 972
 973         ibss_dbg(sdata, "RX Auth SA=%pM DA=%pM\n", mgmt->sa, mgmt->da);
 974         ibss_dbg(sdata, "\tBSSID=%pM (auth_transaction=%d)\n",
 975                  mgmt->bssid, auth_transaction);
 976
 977         if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
 978                 return;
 979
 980         /*
 981          * IEEE 802.11 standard does not require authentication in IBSS
 982          * networks and most implementations do not seem to use it.
 983          * However, try to reply to authentication attempts if someone
 984          * has actually implemented this.
 985          */
 986         ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, 0, NULL, 0,
 987                             mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0, 0);
 988 }
 989
 990 static void ieee80211_update_sta_info(struct ieee80211_sub_if_data *sdata,
 991                                       struct ieee80211_mgmt *mgmt, size_t len,
 992                                       struct ieee80211_rx_status *rx_status,
 993                                       struct ieee802_11_elems *elems,
 994                                       struct ieee80211_channel *channel)
 995 {
 996         struct sta_info *sta;
 997         enum nl80211_band band = rx_status->band;
 998         enum nl80211_bss_scan_width scan_width;
 999         struct ieee80211_local *local = sdata->local;
1000         struct ieee80211_supported_band *sband;
1001         bool rates_updated = false;
1002         u32 supp_rates = 0;
1003
1004         if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
1005                 return;
1006
1007         if (!ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid))
1008                 return;
1009
1010         sband = local->hw.wiphy->bands[band];
1011         if (WARN_ON(!sband))
1012                 return;
1013
1014         rcu_read_lock();
1015         sta = sta_info_get(sdata, mgmt->sa);
1016
1017         if (elems->supp_rates) {
1018                 supp_rates = ieee80211_sta_get_rates(sdata, elems,
1019                                                      band, NULL);
1020                 if (sta) {
1021                         u32 prev_rates;
1022
1023                         prev_rates = sta->sta.supp_rates[band];
1024                         /* make sure mandatory rates are always added */
1025                         scan_width = NL80211_BSS_CHAN_WIDTH_20;
1026                         if (rx_status->bw == RATE_INFO_BW_5)
1027                                 scan_width = NL80211_BSS_CHAN_WIDTH_5;
1028                         else if (rx_status->bw == RATE_INFO_BW_10)
1029                                 scan_width = NL80211_BSS_CHAN_WIDTH_10;
1030
1031                         sta->sta.supp_rates[band] = supp_rates |
1032                                 ieee80211_mandatory_rates(sband, scan_width);
1033                         if (sta->sta.supp_rates[band] != prev_rates) {
1034                                 ibss_dbg(sdata,
1035                                          "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n",
1036                                          sta->sta.addr, prev_rates,
1037                                          sta->sta.supp_rates[band]);
1038                                 rates_updated = true;
1039                         }
1040                 } else {
1041                         rcu_read_unlock();
1042                         sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid,
1043                                                      mgmt->sa, supp_rates);
1044                 }
1045         }
1046
1047         if (sta && !sta->sta.wme &&
1048             elems->wmm_info && local->hw.queues >= IEEE80211_NUM_ACS) {
1049                 sta->sta.wme = true;
1050                 ieee80211_check_fast_xmit(sta);
1051         }
1052
1053         if (sta && elems->ht_operation && elems->ht_cap_elem &&
1054             sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20_NOHT &&
1055             sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_5 &&
1056             sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_10) {
1057                 /* we both use HT */
1058                 struct ieee80211_ht_cap htcap_ie;
1059                 struct cfg80211_chan_def chandef;
1060                 enum ieee80211_sta_rx_bandwidth bw = sta->sta.bandwidth;
1061
1062                 cfg80211_chandef_create(&chandef, channel, NL80211_CHAN_NO_HT);
1063                 ieee80211_chandef_ht_oper(elems->ht_operation, &chandef);
1064
1065                 memcpy(&htcap_ie, elems->ht_cap_elem, sizeof(htcap_ie));
1066                 rates_updated |= ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
1067                                                                    &htcap_ie,
1068                                                                    sta);
1069
1070                 if (elems->vht_operation && elems->vht_cap_elem &&
1071                     sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20 &&
1072                     sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_40) {
1073                         /* we both use VHT */
1074                         struct ieee80211_vht_cap cap_ie;
1075                         struct ieee80211_sta_vht_cap cap = sta->sta.vht_cap;
1076
1077                         ieee80211_chandef_vht_oper(elems->vht_operation,
1078                                                    &chandef);
1079                         memcpy(&cap_ie, elems->vht_cap_elem, sizeof(cap_ie));
1080                         ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
1081                                                             &cap_ie, sta);
1082                         if (memcmp(&cap, &sta->sta.vht_cap, sizeof(cap)))
1083                                 rates_updated |= true;
1084                 }
1085
1086                 if (bw != sta->sta.bandwidth)
1087                         rates_updated |= true;
1088
1089                 if (!cfg80211_chandef_compatible(&sdata->u.ibss.chandef,
1090                                                  &chandef))
1091                         WARN_ON_ONCE(1);
1092         }
1093
1094         if (sta && rates_updated) {
1095                 u32 changed = IEEE80211_RC_SUPP_RATES_CHANGED;
1096                 u8 rx_nss = sta->sta.rx_nss;
1097
1098                 /* Force rx_nss recalculation */
1099                 sta->sta.rx_nss = 0;
1100                 rate_control_rate_init(sta);
1101                 if (sta->sta.rx_nss != rx_nss)
1102                         changed |= IEEE80211_RC_NSS_CHANGED;
1103
1104                 drv_sta_rc_update(local, sdata, &sta->sta, changed);
1105         }
1106
1107         rcu_read_unlock();
1108 }
1109
1110 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1111                                   struct ieee80211_mgmt *mgmt, size_t len,
1112                                   struct ieee80211_rx_status *rx_status,
1113                                   struct ieee802_11_elems *elems)
1114 {
1115         struct ieee80211_local *local = sdata->local;
1116         struct cfg80211_bss *cbss;
1117         struct ieee80211_bss *bss;
1118         struct ieee80211_channel *channel;
1119         u64 beacon_timestamp, rx_timestamp;
1120         u32 supp_rates = 0;
1121         enum nl80211_band band = rx_status->band;
1122
1123         channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
1124         if (!channel)
1125                 return;
1126
1127         ieee80211_update_sta_info(sdata, mgmt, len, rx_status, elems, channel);
1128
1129         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1130                                         channel);
1131         if (!bss)
1132                 return;
1133
1134         cbss = container_of((void *)bss, struct cfg80211_bss, priv);
1135
1136         /* same for beacon and probe response */
1137         beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp);
1138
1139         /* check if we need to merge IBSS */
1140
1141         /* not an IBSS */
1142         if (!(cbss->capability & WLAN_CAPABILITY_IBSS))
1143                 goto put_bss;
1144
1145         /* different channel */
1146         if (sdata->u.ibss.fixed_channel &&
1147             sdata->u.ibss.chandef.chan != cbss->channel)
1148                 goto put_bss;
1149
1150         /* different SSID */
1151         if (elems->ssid_len != sdata->u.ibss.ssid_len ||
1152             memcmp(elems->ssid, sdata->u.ibss.ssid,
1153                                 sdata->u.ibss.ssid_len))
1154                 goto put_bss;
1155
1156         /* process channel switch */
1157         if (sdata->vif.csa_active ||
1158             ieee80211_ibss_process_chanswitch(sdata, elems, true))
1159                 goto put_bss;
1160
1161         /* same BSSID */
1162         if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid))
1163                 goto put_bss;
1164
1165         /* we use a fixed BSSID */
1166         if (sdata->u.ibss.fixed_bssid)
1167                 goto put_bss;
1168
1169         if (ieee80211_have_rx_timestamp(rx_status)) {
1170                 /* time when timestamp field was received */
1171                 rx_timestamp =
1172                         ieee80211_calculate_rx_timestamp(local, rx_status,
1173                                                          len + FCS_LEN, 24);
1174         } else {
1175                 /*
1176                  * second best option: get current TSF
1177                  * (will return -1 if not supported)
1178                  */
1179                 rx_timestamp = drv_get_tsf(local, sdata);
1180         }
1181
1182         ibss_dbg(sdata, "RX beacon SA=%pM BSSID=%pM TSF=0x%llx\n",
1183                  mgmt->sa, mgmt->bssid,
1184                  (unsigned long long)rx_timestamp);
1185         ibss_dbg(sdata, "\tBCN=0x%llx diff=%lld @%lu\n",
1186                  (unsigned long long)beacon_timestamp,
1187                  (unsigned long long)(rx_timestamp - beacon_timestamp),
1188                  jiffies);
1189
1190         if (beacon_timestamp > rx_timestamp) {
1191                 ibss_dbg(sdata,
1192                          "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n",
1193                          mgmt->bssid);
1194                 ieee80211_sta_join_ibss(sdata, bss);
1195                 supp_rates = ieee80211_sta_get_rates(sdata, elems, band, NULL);
1196                 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa,
1197                                        supp_rates);
1198                 rcu_read_unlock();
1199         }
1200
1201  put_bss:
1202         ieee80211_rx_bss_put(local, bss);
1203 }
1204
1205 void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata,
1206                               const u8 *bssid, const u8 *addr,
1207                               u32 supp_rates)
1208 {
1209         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1210         struct ieee80211_local *local = sdata->local;
1211         struct sta_info *sta;
1212         struct ieee80211_chanctx_conf *chanctx_conf;
1213         struct ieee80211_supported_band *sband;
1214         enum nl80211_bss_scan_width scan_width;
1215         int band;
1216
1217         /*
1218          * XXX: Consider removing the least recently used entry and
1219          *      allow new one to be added.
1220          */
1221         if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
1222                 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
1223                                     sdata->name, addr);
1224                 return;
1225         }
1226
1227         if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH)
1228                 return;
1229
1230         if (!ether_addr_equal(bssid, sdata->u.ibss.bssid))
1231                 return;
1232
1233         rcu_read_lock();
1234         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1235         if (WARN_ON_ONCE(!chanctx_conf)) {
1236                 rcu_read_unlock();
1237                 return;
1238         }
1239         band = chanctx_conf->def.chan->band;
1240         scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
1241         rcu_read_unlock();
1242
1243         sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
1244         if (!sta)
1245                 return;
1246
1247         /* make sure mandatory rates are always added */
1248         sband = local->hw.wiphy->bands[band];
1249         sta->sta.supp_rates[band] = supp_rates |
1250                         ieee80211_mandatory_rates(sband, scan_width);
1251
1252         spin_lock(&ifibss->incomplete_lock);
1253         list_add(&sta->list, &ifibss->incomplete_stations);
1254         spin_unlock(&ifibss->incomplete_lock);
1255         ieee80211_queue_work(&local->hw, &sdata->work);
1256 }
1257
1258 static void ieee80211_ibss_sta_expire(struct ieee80211_sub_if_data *sdata)
1259 {
1260         struct ieee80211_local *local = sdata->local;
1261         struct sta_info *sta, *tmp;
1262         unsigned long exp_time = IEEE80211_IBSS_INACTIVITY_LIMIT;
1263         unsigned long exp_rsn = IEEE80211_IBSS_RSN_INACTIVITY_LIMIT;
1264
1265         mutex_lock(&local->sta_mtx);
1266
1267         list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
1268                 unsigned long last_active = ieee80211_sta_last_active(sta);
1269
1270                 if (sdata != sta->sdata)
1271                         continue;
1272
1273                 if (time_is_before_jiffies(last_active + exp_time) ||
1274                     (time_is_before_jiffies(last_active + exp_rsn) &&
1275                      sta->sta_state != IEEE80211_STA_AUTHORIZED)) {
1276                         sta_dbg(sta->sdata, "expiring inactive %sSTA %pM\n",
1277                                 sta->sta_state != IEEE80211_STA_AUTHORIZED ?
1278                                 "not authorized " : "", sta->sta.addr);
1279
1280                         WARN_ON(__sta_info_destroy(sta));
1281                 }
1282         }
1283
1284         mutex_unlock(&local->sta_mtx);
1285 }
1286
1287 /*
1288  * This function is called with state == IEEE80211_IBSS_MLME_JOINED
1289  */
1290
1291 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
1292 {
1293         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1294         enum nl80211_bss_scan_width scan_width;
1295
1296         sdata_assert_lock(sdata);
1297
1298         mod_timer(&ifibss->timer,
1299                   round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
1300
1301         ieee80211_ibss_sta_expire(sdata);
1302
1303         if (time_before(jiffies, ifibss->last_scan_completed +
1304                        IEEE80211_IBSS_MERGE_INTERVAL))
1305                 return;
1306
1307         if (ieee80211_sta_active_ibss(sdata))
1308                 return;
1309
1310         if (ifibss->fixed_channel)
1311                 return;
1312
1313         sdata_info(sdata,
1314                    "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n");
1315
1316         scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
1317         ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len,
1318                                     NULL, 0, scan_width);
1319 }
1320
1321 static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
1322 {
1323         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1324         u8 bssid[ETH_ALEN];
1325         u16 capability;
1326         int i;
1327
1328         sdata_assert_lock(sdata);
1329
1330         if (ifibss->fixed_bssid) {
1331                 memcpy(bssid, ifibss->bssid, ETH_ALEN);
1332         } else {
1333                 /* Generate random, not broadcast, locally administered BSSID. Mix in
1334                  * own MAC address to make sure that devices that do not have proper
1335                  * random number generator get different BSSID. */
1336                 get_random_bytes(bssid, ETH_ALEN);
1337                 for (i = 0; i < ETH_ALEN; i++)
1338                         bssid[i] ^= sdata->vif.addr[i];
1339                 bssid[0] &= ~0x01;
1340                 bssid[0] |= 0x02;
1341         }
1342
1343         sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid);
1344
1345         capability = WLAN_CAPABILITY_IBSS;
1346
1347         if (ifibss->privacy)
1348                 capability |= WLAN_CAPABILITY_PRIVACY;
1349
1350         __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int,
1351                                   &ifibss->chandef, ifibss->basic_rates,
1352                                   capability, 0, true);
1353 }
1354
1355 static unsigned ibss_setup_channels(struct wiphy *wiphy,
1356                                     struct ieee80211_channel **channels,
1357                                     unsigned int channels_max,
1358                                     u32 center_freq, u32 width)
1359 {
1360         struct ieee80211_channel *chan = NULL;
1361         unsigned int n_chan = 0;
1362         u32 start_freq, end_freq, freq;
1363
1364         if (width <= 20) {
1365                 start_freq = center_freq;
1366                 end_freq = center_freq;
1367         } else {
1368                 start_freq = center_freq - width / 2 + 10;
1369                 end_freq = center_freq + width / 2 - 10;
1370         }
1371
1372         for (freq = start_freq; freq <= end_freq; freq += 20) {
1373                 chan = ieee80211_get_channel(wiphy, freq);
1374                 if (!chan)
1375                         continue;
1376                 if (n_chan >= channels_max)
1377                         return n_chan;
1378
1379                 channels[n_chan] = chan;
1380                 n_chan++;
1381         }
1382
1383         return n_chan;
1384 }
1385
1386 static unsigned int
1387 ieee80211_ibss_setup_scan_channels(struct wiphy *wiphy,
1388                                    const struct cfg80211_chan_def *chandef,
1389                                    struct ieee80211_channel **channels,
1390                                    unsigned int channels_max)
1391 {
1392         unsigned int n_chan = 0;
1393         u32 width, cf1, cf2 = 0;
1394
1395         switch (chandef->width) {
1396         case NL80211_CHAN_WIDTH_40:
1397                 width = 40;
1398                 break;
1399         case NL80211_CHAN_WIDTH_80P80:
1400                 cf2 = chandef->center_freq2;
1401                 /* fall through */
1402         case NL80211_CHAN_WIDTH_80:
1403                 width = 80;
1404                 break;
1405         case NL80211_CHAN_WIDTH_160:
1406                 width = 160;
1407                 break;
1408         default:
1409                 width = 20;
1410                 break;
1411         }
1412
1413         cf1 = chandef->center_freq1;
1414
1415         n_chan = ibss_setup_channels(wiphy, channels, channels_max, cf1, width);
1416
1417         if (cf2)
1418                 n_chan += ibss_setup_channels(wiphy, &channels[n_chan],
1419                                               channels_max - n_chan, cf2,
1420                                               width);
1421
1422         return n_chan;
1423 }
1424
1425 /*
1426  * This function is called with state == IEEE80211_IBSS_MLME_SEARCH
1427  */
1428
1429 static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
1430 {
1431         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1432         struct ieee80211_local *local = sdata->local;
1433         struct cfg80211_bss *cbss;
1434         struct ieee80211_channel *chan = NULL;
1435         const u8 *bssid = NULL;
1436         enum nl80211_bss_scan_width scan_width;
1437         int active_ibss;
1438
1439         sdata_assert_lock(sdata);
1440
1441         active_ibss = ieee80211_sta_active_ibss(sdata);
1442         ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss);
1443
1444         if (active_ibss)
1445                 return;
1446
1447         if (ifibss->fixed_bssid)
1448                 bssid = ifibss->bssid;
1449         if (ifibss->fixed_channel)
1450                 chan = ifibss->chandef.chan;
1451         if (!is_zero_ether_addr(ifibss->bssid))
1452                 bssid = ifibss->bssid;
1453         cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid,
1454                                 ifibss->ssid, ifibss->ssid_len,
1455                                 IEEE80211_BSS_TYPE_IBSS,
1456                                 IEEE80211_PRIVACY(ifibss->privacy));
1457
1458         if (cbss) {
1459                 struct ieee80211_bss *bss;
1460
1461                 bss = (void *)cbss->priv;
1462                 ibss_dbg(sdata,
1463                          "sta_find_ibss: selected %pM current %pM\n",
1464                          cbss->bssid, ifibss->bssid);
1465                 sdata_info(sdata,
1466                            "Selected IBSS BSSID %pM based on configured SSID\n",
1467                            cbss->bssid);
1468
1469                 ieee80211_sta_join_ibss(sdata, bss);
1470                 ieee80211_rx_bss_put(local, bss);
1471                 return;
1472         }
1473
1474         /* if a fixed bssid and a fixed freq have been provided create the IBSS
1475          * directly and do not waste time scanning
1476          */
1477         if (ifibss->fixed_bssid && ifibss->fixed_channel) {
1478                 sdata_info(sdata, "Created IBSS using preconfigured BSSID %pM\n",
1479                            bssid);
1480                 ieee80211_sta_create_ibss(sdata);
1481                 return;
1482         }
1483
1484
1485         ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n");
1486
1487         /* Selected IBSS not found in current scan results - try to scan */
1488         if (time_after(jiffies, ifibss->last_scan_completed +
1489                                         IEEE80211_SCAN_INTERVAL)) {
1490                 struct ieee80211_channel *channels[8];
1491                 unsigned int num;
1492
1493                 sdata_info(sdata, "Trigger new scan to find an IBSS to join\n");
1494
1495                 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
1496
1497                 if (ifibss->fixed_channel) {
1498                         num = ieee80211_ibss_setup_scan_channels(local->hw.wiphy,
1499                                                                  &ifibss->chandef,
1500                                                                  channels,
1501                                                                  ARRAY_SIZE(channels));
1502                         ieee80211_request_ibss_scan(sdata, ifibss->ssid,
1503                                                     ifibss->ssid_len, channels,
1504                                                     num, scan_width);
1505                 } else {
1506                         ieee80211_request_ibss_scan(sdata, ifibss->ssid,
1507                                                     ifibss->ssid_len, NULL,
1508                                                     0, scan_width);
1509                 }
1510         } else {
1511                 int interval = IEEE80211_SCAN_INTERVAL;
1512
1513                 if (time_after(jiffies, ifibss->ibss_join_req +
1514                                IEEE80211_IBSS_JOIN_TIMEOUT))
1515                         ieee80211_sta_create_ibss(sdata);
1516
1517                 mod_timer(&ifibss->timer,
1518                           round_jiffies(jiffies + interval));
1519         }
1520 }
1521
1522 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
1523                                         struct sk_buff *req)
1524 {
1525         struct ieee80211_mgmt *mgmt = (void *)req->data;
1526         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1527         struct ieee80211_local *local = sdata->local;
1528         int tx_last_beacon, len = req->len;
1529         struct sk_buff *skb;
1530         struct beacon_data *presp;
1531         u8 *pos, *end;
1532
1533         sdata_assert_lock(sdata);
1534
1535         presp = rcu_dereference_protected(ifibss->presp,
1536                                           lockdep_is_held(&sdata->wdev.mtx));
1537
1538         if (ifibss->state != IEEE80211_IBSS_MLME_JOINED ||
1539             len < 24 + 2 || !presp)
1540                 return;
1541
1542         tx_last_beacon = drv_tx_last_beacon(local);
1543
1544         ibss_dbg(sdata, "RX ProbeReq SA=%pM DA=%pM\n", mgmt->sa, mgmt->da);
1545         ibss_dbg(sdata, "\tBSSID=%pM (tx_last_beacon=%d)\n",
1546                  mgmt->bssid, tx_last_beacon);
1547
1548         if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da))
1549                 return;
1550
1551         if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) &&
1552             !is_broadcast_ether_addr(mgmt->bssid))
1553                 return;
1554
1555         end = ((u8 *) mgmt) + len;
1556         pos = mgmt->u.probe_req.variable;
1557         if (pos[0] != WLAN_EID_SSID ||
1558             pos + 2 + pos[1] > end) {
1559                 ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n",
1560                          mgmt->sa);
1561                 return;
1562         }
1563         if (pos[1] != 0 &&
1564             (pos[1] != ifibss->ssid_len ||
1565              memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) {
1566                 /* Ignore ProbeReq for foreign SSID */
1567                 return;
1568         }
1569
1570         /* Reply with ProbeResp */
1571         skb = dev_alloc_skb(local->tx_headroom + presp->head_len);
1572         if (!skb)
1573                 return;
1574
1575         skb_reserve(skb, local->tx_headroom);
1576         skb_put_data(skb, presp->head, presp->head_len);
1577
1578         memcpy(((struct ieee80211_mgmt *) skb->data)->da, mgmt->sa, ETH_ALEN);
1579         ibss_dbg(sdata, "Sending ProbeResp to %pM\n", mgmt->sa);
1580         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1581
1582         /* avoid excessive retries for probe request to wildcard SSIDs */
1583         if (pos[1] == 0)
1584                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_NO_ACK;
1585
1586         ieee80211_tx_skb(sdata, skb);
1587 }
1588
1589 static
1590 void ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data *sdata,
1591                                     struct ieee80211_mgmt *mgmt, size_t len,
1592                                     struct ieee80211_rx_status *rx_status)
1593 {
1594         size_t baselen;
1595         struct ieee802_11_elems elems;
1596
1597         BUILD_BUG_ON(offsetof(typeof(mgmt->u.probe_resp), variable) !=
1598                      offsetof(typeof(mgmt->u.beacon), variable));
1599
1600         /*
1601          * either beacon or probe_resp but the variable field is at the
1602          * same offset
1603          */
1604         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1605         if (baselen > len)
1606                 return;
1607
1608         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1609                                false, &elems);
1610
1611         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
1612 }
1613
1614 void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1615                                    struct sk_buff *skb)
1616 {
1617         struct ieee80211_rx_status *rx_status;
1618         struct ieee80211_mgmt *mgmt;
1619         u16 fc;
1620         struct ieee802_11_elems elems;
1621         int ies_len;
1622
1623         rx_status = IEEE80211_SKB_RXCB(skb);
1624         mgmt = (struct ieee80211_mgmt *) skb->data;
1625         fc = le16_to_cpu(mgmt->frame_control);
1626
1627         sdata_lock(sdata);
1628
1629         if (!sdata->u.ibss.ssid_len)
1630                 goto mgmt_out; /* not ready to merge yet */
1631
1632         switch (fc & IEEE80211_FCTL_STYPE) {
1633         case IEEE80211_STYPE_PROBE_REQ:
1634                 ieee80211_rx_mgmt_probe_req(sdata, skb);
1635                 break;
1636         case IEEE80211_STYPE_PROBE_RESP:
1637         case IEEE80211_STYPE_BEACON:
1638                 ieee80211_rx_mgmt_probe_beacon(sdata, mgmt, skb->len,
1639                                                rx_status);
1640                 break;
1641         case IEEE80211_STYPE_AUTH:
1642                 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len);
1643                 break;
1644         case IEEE80211_STYPE_DEAUTH:
1645                 ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len);
1646                 break;
1647         case IEEE80211_STYPE_ACTION:
1648                 switch (mgmt->u.action.category) {
1649                 case WLAN_CATEGORY_SPECTRUM_MGMT:
1650                         ies_len = skb->len -
1651                                   offsetof(struct ieee80211_mgmt,
1652                                            u.action.u.chan_switch.variable);
1653
1654                         if (ies_len < 0)
1655                                 break;
1656
1657                         ieee802_11_parse_elems(
1658                                 mgmt->u.action.u.chan_switch.variable,
1659                                 ies_len, true, &elems);
1660
1661                         if (elems.parse_error)
1662                                 break;
1663
1664                         ieee80211_rx_mgmt_spectrum_mgmt(sdata, mgmt, skb->len,
1665                                                         rx_status, &elems);
1666                         break;
1667                 }
1668         }
1669
1670  mgmt_out:
1671         sdata_unlock(sdata);
1672 }
1673
1674 void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata)
1675 {
1676         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1677         struct sta_info *sta;
1678
1679         sdata_lock(sdata);
1680
1681         /*
1682          * Work could be scheduled after scan or similar
1683          * when we aren't even joined (or trying) with a
1684          * network.
1685          */
1686         if (!ifibss->ssid_len)
1687                 goto out;
1688
1689         spin_lock_bh(&ifibss->incomplete_lock);
1690         while (!list_empty(&ifibss->incomplete_stations)) {
1691                 sta = list_first_entry(&ifibss->incomplete_stations,
1692                                        struct sta_info, list);
1693                 list_del(&sta->list);
1694                 spin_unlock_bh(&ifibss->incomplete_lock);
1695
1696                 ieee80211_ibss_finish_sta(sta);
1697                 rcu_read_unlock();
1698                 spin_lock_bh(&ifibss->incomplete_lock);
1699         }
1700         spin_unlock_bh(&ifibss->incomplete_lock);
1701
1702         switch (ifibss->state) {
1703         case IEEE80211_IBSS_MLME_SEARCH:
1704                 ieee80211_sta_find_ibss(sdata);
1705                 break;
1706         case IEEE80211_IBSS_MLME_JOINED:
1707                 ieee80211_sta_merge_ibss(sdata);
1708                 break;
1709         default:
1710                 WARN_ON(1);
1711                 break;
1712         }
1713
1714  out:
1715         sdata_unlock(sdata);
1716 }
1717
1718 static void ieee80211_ibss_timer(struct timer_list *t)
1719 {
1720         struct ieee80211_sub_if_data *sdata =
1721                 from_timer(sdata, t, u.ibss.timer);
1722
1723         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1724 }
1725
1726 void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata)
1727 {
1728         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1729
1730         timer_setup(&ifibss->timer, ieee80211_ibss_timer, 0);
1731         INIT_LIST_HEAD(&ifibss->incomplete_stations);
1732         spin_lock_init(&ifibss->incomplete_lock);
1733         INIT_WORK(&ifibss->csa_connection_drop_work,
1734                   ieee80211_csa_connection_drop_work);
1735 }
1736
1737 /* scan finished notification */
1738 void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local)
1739 {
1740         struct ieee80211_sub_if_data *sdata;
1741
1742         mutex_lock(&local->iflist_mtx);
1743         list_for_each_entry(sdata, &local->interfaces, list) {
1744                 if (!ieee80211_sdata_running(sdata))
1745                         continue;
1746                 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
1747                         continue;
1748                 sdata->u.ibss.last_scan_completed = jiffies;
1749         }
1750         mutex_unlock(&local->iflist_mtx);
1751 }
1752
1753 int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
1754                         struct cfg80211_ibss_params *params)
1755 {
1756         u32 changed = 0;
1757         u32 rate_flags;
1758         struct ieee80211_supported_band *sband;
1759         enum ieee80211_chanctx_mode chanmode;
1760         struct ieee80211_local *local = sdata->local;
1761         int radar_detect_width = 0;
1762         int i;
1763         int ret;
1764
1765         ret = cfg80211_chandef_dfs_required(local->hw.wiphy,
1766                                             &params->chandef,
1767                                             sdata->wdev.iftype);
1768         if (ret < 0)
1769                 return ret;
1770
1771         if (ret > 0) {
1772                 if (!params->userspace_handles_dfs)
1773                         return -EINVAL;
1774                 radar_detect_width = BIT(params->chandef.width);
1775         }
1776
1777         chanmode = (params->channel_fixed && !ret) ?
1778                 IEEE80211_CHANCTX_SHARED : IEEE80211_CHANCTX_EXCLUSIVE;
1779
1780         mutex_lock(&local->chanctx_mtx);
1781         ret = ieee80211_check_combinations(sdata, &params->chandef, chanmode,
1782                                            radar_detect_width);
1783         mutex_unlock(&local->chanctx_mtx);
1784         if (ret < 0)
1785                 return ret;
1786
1787         if (params->bssid) {
1788                 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN);
1789                 sdata->u.ibss.fixed_bssid = true;
1790         } else
1791                 sdata->u.ibss.fixed_bssid = false;
1792
1793         sdata->u.ibss.privacy = params->privacy;
1794         sdata->u.ibss.control_port = params->control_port;
1795         sdata->u.ibss.userspace_handles_dfs = params->userspace_handles_dfs;
1796         sdata->u.ibss.basic_rates = params->basic_rates;
1797         sdata->u.ibss.last_scan_completed = jiffies;
1798
1799         /* fix basic_rates if channel does not support these rates */
1800         rate_flags = ieee80211_chandef_rate_flags(&params->chandef);
1801         sband = local->hw.wiphy->bands[params->chandef.chan->band];
1802         for (i = 0; i < sband->n_bitrates; i++) {
1803                 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
1804                         sdata->u.ibss.basic_rates &= ~BIT(i);
1805         }
1806         memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate,
1807                sizeof(params->mcast_rate));
1808
1809         sdata->vif.bss_conf.beacon_int = params->beacon_interval;
1810
1811         sdata->u.ibss.chandef = params->chandef;
1812         sdata->u.ibss.fixed_channel = params->channel_fixed;
1813
1814         if (params->ie) {
1815                 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len,
1816                                            GFP_KERNEL);
1817                 if (sdata->u.ibss.ie)
1818                         sdata->u.ibss.ie_len = params->ie_len;
1819         }
1820
1821         sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
1822         sdata->u.ibss.ibss_join_req = jiffies;
1823
1824         memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len);
1825         sdata->u.ibss.ssid_len = params->ssid_len;
1826
1827         memcpy(&sdata->u.ibss.ht_capa, &params->ht_capa,
1828                sizeof(sdata->u.ibss.ht_capa));
1829         memcpy(&sdata->u.ibss.ht_capa_mask, &params->ht_capa_mask,
1830                sizeof(sdata->u.ibss.ht_capa_mask));
1831
1832         /*
1833          * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is
1834          * reserved, but an HT STA shall protect HT transmissions as though
1835          * the HT Protection field were set to non-HT mixed mode.
1836          *
1837          * In an IBSS, the RIFS Mode field of the HT Operation element is
1838          * also reserved, but an HT STA shall operate as though this field
1839          * were set to 1.
1840          */
1841
1842         sdata->vif.bss_conf.ht_operation_mode |=
1843                   IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED
1844                 | IEEE80211_HT_PARAM_RIFS_MODE;
1845
1846         changed |= BSS_CHANGED_HT | BSS_CHANGED_MCAST_RATE;
1847         ieee80211_bss_info_change_notify(sdata, changed);
1848
1849         sdata->smps_mode = IEEE80211_SMPS_OFF;
1850         sdata->needed_rx_chains = local->rx_chains;
1851         sdata->control_port_over_nl80211 = params->control_port_over_nl80211;
1852
1853         ieee80211_queue_work(&local->hw, &sdata->work);
1854
1855         return 0;
1856 }
1857
1858 int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata)
1859 {
1860         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1861
1862         ieee80211_ibss_disconnect(sdata);
1863         ifibss->ssid_len = 0;
1864         eth_zero_addr(ifibss->bssid);
1865
1866         /* remove beacon */
1867         kfree(sdata->u.ibss.ie);
1868         sdata->u.ibss.ie = NULL;
1869         sdata->u.ibss.ie_len = 0;
1870
1871         /* on the next join, re-program HT parameters */
1872         memset(&ifibss->ht_capa, 0, sizeof(ifibss->ht_capa));
1873         memset(&ifibss->ht_capa_mask, 0, sizeof(ifibss->ht_capa_mask));
1874
1875         synchronize_rcu();
1876
1877         skb_queue_purge(&sdata->skb_queue);
1878
1879         del_timer_sync(&sdata->u.ibss.timer);
1880
1881         return 0;
1882 }