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         /* update cfg80211 bss information with the new channel */
 548         if (!is_zero_ether_addr(ifibss->bssid)) {
 549                 cbss = cfg80211_get_bss(sdata->local->hw.wiphy,
 550                                         ifibss->chandef.chan,
 551                                         ifibss->bssid, ifibss->ssid,
 552                                         ifibss->ssid_len,
 553                                         IEEE80211_BSS_TYPE_IBSS,
 554                                         IEEE80211_PRIVACY(ifibss->privacy));
 555                 /* XXX: should not really modify cfg80211 data */
 556                 if (cbss) {
 557                         cbss->channel = sdata->csa_chandef.chan;
 558                         cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
 559                 }
 560         }
 561
 562         ifibss->chandef = sdata->csa_chandef;
 563
 564         /* generate the beacon */
 565         err = ieee80211_ibss_csa_beacon(sdata, NULL);
 566         if (err < 0)
 567                 return err;
 568
 569         changed |= err;
 570
 571         return changed;
 572 }
 573
 574 void ieee80211_ibss_stop(struct ieee80211_sub_if_data *sdata)
 575 {
 576         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 577
 578         cancel_work_sync(&ifibss->csa_connection_drop_work);
 579 }
 580
 581 static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta)
 582         __acquires(RCU)
 583 {
 584         struct ieee80211_sub_if_data *sdata = sta->sdata;
 585         u8 addr[ETH_ALEN];
 586
 587         memcpy(addr, sta->sta.addr, ETH_ALEN);
 588
 589         ibss_dbg(sdata, "Adding new IBSS station %pM\n", addr);
 590
 591         sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
 592         sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
 593         /* authorize the station only if the network is not RSN protected. If
 594          * not wait for the userspace to authorize it */
 595         if (!sta->sdata->u.ibss.control_port)
 596                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
 597
 598         rate_control_rate_init(sta);
 599
 600         /* If it fails, maybe we raced another insertion? */
 601         if (sta_info_insert_rcu(sta))
 602                 return sta_info_get(sdata, addr);
 603         return sta;
 604 }
 605
 606 static struct sta_info *
 607 ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, const u8 *bssid,
 608                        const u8 *addr, u32 supp_rates)
 609         __acquires(RCU)
 610 {
 611         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 612         struct ieee80211_local *local = sdata->local;
 613         struct sta_info *sta;
 614         struct ieee80211_chanctx_conf *chanctx_conf;
 615         struct ieee80211_supported_band *sband;
 616         enum nl80211_bss_scan_width scan_width;
 617         int band;
 618
 619         /*
 620          * XXX: Consider removing the least recently used entry and
 621          *      allow new one to be added.
 622          */
 623         if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
 624                 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
 625                                     sdata->name, addr);
 626                 rcu_read_lock();
 627                 return NULL;
 628         }
 629
 630         if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) {
 631                 rcu_read_lock();
 632                 return NULL;
 633         }
 634
 635         if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) {
 636                 rcu_read_lock();
 637                 return NULL;
 638         }
 639
 640         rcu_read_lock();
 641         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 642         if (WARN_ON_ONCE(!chanctx_conf))
 643                 return NULL;
 644         band = chanctx_conf->def.chan->band;
 645         scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
 646         rcu_read_unlock();
 647
 648         sta = sta_info_alloc(sdata, addr, GFP_KERNEL);
 649         if (!sta) {
 650                 rcu_read_lock();
 651                 return NULL;
 652         }
 653
 654         /* make sure mandatory rates are always added */
 655         sband = local->hw.wiphy->bands[band];
 656         sta->sta.supp_rates[band] = supp_rates |
 657                         ieee80211_mandatory_rates(sband, scan_width);
 658
 659         return ieee80211_ibss_finish_sta(sta);
 660 }
 661
 662 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
 663 {
 664         struct ieee80211_local *local = sdata->local;
 665         int active = 0;
 666         struct sta_info *sta;
 667
 668         sdata_assert_lock(sdata);
 669
 670         rcu_read_lock();
 671
 672         list_for_each_entry_rcu(sta, &local->sta_list, list) {
 673                 unsigned long last_active = ieee80211_sta_last_active(sta);
 674
 675                 if (sta->sdata == sdata &&
 676                     time_is_after_jiffies(last_active +
 677                                           IEEE80211_IBSS_MERGE_INTERVAL)) {
 678                         active++;
 679                         break;
 680                 }
 681         }
 682
 683         rcu_read_unlock();
 684
 685         return active;
 686 }
 687
 688 static void ieee80211_ibss_disconnect(struct ieee80211_sub_if_data *sdata)
 689 {
 690         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 691         struct ieee80211_local *local = sdata->local;
 692         struct cfg80211_bss *cbss;
 693         struct beacon_data *presp;
 694         struct sta_info *sta;
 695
 696         if (!is_zero_ether_addr(ifibss->bssid)) {
 697                 cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->chandef.chan,
 698                                         ifibss->bssid, ifibss->ssid,
 699                                         ifibss->ssid_len,
 700                                         IEEE80211_BSS_TYPE_IBSS,
 701                                         IEEE80211_PRIVACY(ifibss->privacy));
 702
 703                 if (cbss) {
 704                         cfg80211_unlink_bss(local->hw.wiphy, cbss);
 705                         cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
 706                 }
 707         }
 708
 709         ifibss->state = IEEE80211_IBSS_MLME_SEARCH;
 710
 711         sta_info_flush(sdata);
 712
 713         spin_lock_bh(&ifibss->incomplete_lock);
 714         while (!list_empty(&ifibss->incomplete_stations)) {
 715                 sta = list_first_entry(&ifibss->incomplete_stations,
 716                                        struct sta_info, list);
 717                 list_del(&sta->list);
 718                 spin_unlock_bh(&ifibss->incomplete_lock);
 719
 720                 sta_info_free(local, sta);
 721                 spin_lock_bh(&ifibss->incomplete_lock);
 722         }
 723         spin_unlock_bh(&ifibss->incomplete_lock);
 724
 725         netif_carrier_off(sdata->dev);
 726
 727         sdata->vif.bss_conf.ibss_joined = false;
 728         sdata->vif.bss_conf.ibss_creator = false;
 729         sdata->vif.bss_conf.enable_beacon = false;
 730         sdata->vif.bss_conf.ssid_len = 0;
 731
 732         /* remove beacon */
 733         presp = rcu_dereference_protected(ifibss->presp,
 734                                           lockdep_is_held(&sdata->wdev.mtx));
 735         RCU_INIT_POINTER(sdata->u.ibss.presp, NULL);
 736         if (presp)
 737                 kfree_rcu(presp, rcu_head);
 738
 739         clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state);
 740         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED |
 741                                                 BSS_CHANGED_IBSS);
 742         drv_leave_ibss(local, sdata);
 743         mutex_lock(&local->mtx);
 744         ieee80211_vif_release_channel(sdata);
 745         mutex_unlock(&local->mtx);
 746 }
 747
 748 static void ieee80211_csa_connection_drop_work(struct work_struct *work)
 749 {
 750         struct ieee80211_sub_if_data *sdata =
 751                 container_of(work, struct ieee80211_sub_if_data,
 752                              u.ibss.csa_connection_drop_work);
 753
 754         sdata_lock(sdata);
 755
 756         ieee80211_ibss_disconnect(sdata);
 757         synchronize_rcu();
 758         skb_queue_purge(&sdata->skb_queue);
 759
 760         /* trigger a scan to find another IBSS network to join */
 761         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
 762
 763         sdata_unlock(sdata);
 764 }
 765
 766 static void ieee80211_ibss_csa_mark_radar(struct ieee80211_sub_if_data *sdata)
 767 {
 768         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 769         int err;
 770
 771         /* if the current channel is a DFS channel, mark the channel as
 772          * unavailable.
 773          */
 774         err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
 775                                             &ifibss->chandef,
 776                                             NL80211_IFTYPE_ADHOC);
 777         if (err > 0)
 778                 cfg80211_radar_event(sdata->local->hw.wiphy, &ifibss->chandef,
 779                                      GFP_ATOMIC);
 780 }
 781
 782 static bool
 783 ieee80211_ibss_process_chanswitch(struct ieee80211_sub_if_data *sdata,
 784                                   struct ieee802_11_elems *elems,
 785                                   bool beacon)
 786 {
 787         struct cfg80211_csa_settings params;
 788         struct ieee80211_csa_ie csa_ie;
 789         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 790         enum nl80211_channel_type ch_type;
 791         int err;
 792         u32 sta_flags;
 793
 794         sdata_assert_lock(sdata);
 795
 796         sta_flags = IEEE80211_STA_DISABLE_VHT;
 797         switch (ifibss->chandef.width) {
 798         case NL80211_CHAN_WIDTH_5:
 799         case NL80211_CHAN_WIDTH_10:
 800         case NL80211_CHAN_WIDTH_20_NOHT:
 801                 sta_flags |= IEEE80211_STA_DISABLE_HT;
 802                 /* fall through */
 803         case NL80211_CHAN_WIDTH_20:
 804                 sta_flags |= IEEE80211_STA_DISABLE_40MHZ;
 805                 break;
 806         default:
 807                 break;
 808         }
 809
 810         memset(&params, 0, sizeof(params));
 811         err = ieee80211_parse_ch_switch_ie(sdata, elems,
 812                                            ifibss->chandef.chan->band,
 813                                            sta_flags, ifibss->bssid, &csa_ie);
 814         /* can't switch to destination channel, fail */
 815         if (err < 0)
 816                 goto disconnect;
 817
 818         /* did not contain a CSA */
 819         if (err)
 820                 return false;
 821
 822         /* channel switch is not supported, disconnect */
 823         if (!(sdata->local->hw.wiphy->flags & WIPHY_FLAG_HAS_CHANNEL_SWITCH))
 824                 goto disconnect;
 825
 826         params.count = csa_ie.count;
 827         params.chandef = csa_ie.chandef;
 828
 829         switch (ifibss->chandef.width) {
 830         case NL80211_CHAN_WIDTH_20_NOHT:
 831         case NL80211_CHAN_WIDTH_20:
 832         case NL80211_CHAN_WIDTH_40:
 833                 /* keep our current HT mode (HT20/HT40+/HT40-), even if
 834                  * another mode  has been announced. The mode is not adopted
 835                  * within the beacon while doing CSA and we should therefore
 836                  * keep the mode which we announce.
 837                  */
 838                 ch_type = cfg80211_get_chandef_type(&ifibss->chandef);
 839                 cfg80211_chandef_create(&params.chandef, params.chandef.chan,
 840                                         ch_type);
 841                 break;
 842         case NL80211_CHAN_WIDTH_5:
 843         case NL80211_CHAN_WIDTH_10:
 844                 if (params.chandef.width != ifibss->chandef.width) {
 845                         sdata_info(sdata,
 846                                    "IBSS %pM received channel switch from incompatible channel width (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
 847                                    ifibss->bssid,
 848                                    params.chandef.chan->center_freq,
 849                                    params.chandef.width,
 850                                    params.chandef.center_freq1,
 851                                    params.chandef.center_freq2);
 852                         goto disconnect;
 853                 }
 854                 break;
 855         default:
 856                 /* should not happen, sta_flags should prevent VHT modes. */
 857                 WARN_ON(1);
 858                 goto disconnect;
 859         }
 860
 861         if (!cfg80211_reg_can_beacon(sdata->local->hw.wiphy, &params.chandef,
 862                                      NL80211_IFTYPE_ADHOC)) {
 863                 sdata_info(sdata,
 864                            "IBSS %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
 865                            ifibss->bssid,
 866                            params.chandef.chan->center_freq,
 867                            params.chandef.width,
 868                            params.chandef.center_freq1,
 869                            params.chandef.center_freq2);
 870                 goto disconnect;
 871         }
 872
 873         err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
 874                                             &params.chandef,
 875                                             NL80211_IFTYPE_ADHOC);
 876         if (err < 0)
 877                 goto disconnect;
 878         if (err > 0 && !ifibss->userspace_handles_dfs) {
 879                 /* IBSS-DFS only allowed with a control program */
 880                 goto disconnect;
 881         }
 882
 883         params.radar_required = err;
 884
 885         if (cfg80211_chandef_identical(&params.chandef,
 886                                        &sdata->vif.bss_conf.chandef)) {
 887                 ibss_dbg(sdata,
 888                          "received csa with an identical chandef, ignoring\n");
 889                 return true;
 890         }
 891
 892         /* all checks done, now perform the channel switch. */
 893         ibss_dbg(sdata,
 894                  "received channel switch announcement to go to channel %d MHz\n",
 895                  params.chandef.chan->center_freq);
 896
 897         params.block_tx = !!csa_ie.mode;
 898
 899         if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev,
 900                                      &params))
 901                 goto disconnect;
 902
 903         ieee80211_ibss_csa_mark_radar(sdata);
 904
 905         return true;
 906 disconnect:
 907         ibss_dbg(sdata, "Can't handle channel switch, disconnect\n");
 908         ieee80211_queue_work(&sdata->local->hw,
 909                              &ifibss->csa_connection_drop_work);
 910
 911         ieee80211_ibss_csa_mark_radar(sdata);
 912
 913         return true;
 914 }
 915
 916 static void
 917 ieee80211_rx_mgmt_spectrum_mgmt(struct ieee80211_sub_if_data *sdata,
 918                                 struct ieee80211_mgmt *mgmt, size_t len,
 919                                 struct ieee80211_rx_status *rx_status,
 920                                 struct ieee802_11_elems *elems)
 921 {
 922         int required_len;
 923
 924         if (len < IEEE80211_MIN_ACTION_SIZE + 1)
 925                 return;
 926
 927         /* CSA is the only action we handle for now */
 928         if (mgmt->u.action.u.measurement.action_code !=
 929             WLAN_ACTION_SPCT_CHL_SWITCH)
 930                 return;
 931
 932         required_len = IEEE80211_MIN_ACTION_SIZE +
 933                        sizeof(mgmt->u.action.u.chan_switch);
 934         if (len < required_len)
 935                 return;
 936
 937         if (!sdata->vif.csa_active)
 938                 ieee80211_ibss_process_chanswitch(sdata, elems, false);
 939 }
 940
 941 static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data *sdata,
 942                                           struct ieee80211_mgmt *mgmt,
 943                                           size_t len)
 944 {
 945         u16 reason = le16_to_cpu(mgmt->u.deauth.reason_code);
 946
 947         if (len < IEEE80211_DEAUTH_FRAME_LEN)
 948                 return;
 949
 950         ibss_dbg(sdata, "RX DeAuth SA=%pM DA=%pM\n", mgmt->sa, mgmt->da);
 951         ibss_dbg(sdata, "\tBSSID=%pM (reason: %d)\n", mgmt->bssid, reason);
 952         sta_info_destroy_addr(sdata, mgmt->sa);
 953 }
 954
 955 static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata,
 956                                         struct ieee80211_mgmt *mgmt,
 957                                         size_t len)
 958 {
 959         u16 auth_alg, auth_transaction;
 960
 961         sdata_assert_lock(sdata);
 962
 963         if (len < 24 + 6)
 964                 return;
 965
 966         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
 967         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
 968
 969         ibss_dbg(sdata, "RX Auth SA=%pM DA=%pM\n", mgmt->sa, mgmt->da);
 970         ibss_dbg(sdata, "\tBSSID=%pM (auth_transaction=%d)\n",
 971                  mgmt->bssid, auth_transaction);
 972
 973         if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
 974                 return;
 975
 976         /*
 977          * IEEE 802.11 standard does not require authentication in IBSS
 978          * networks and most implementations do not seem to use it.
 979          * However, try to reply to authentication attempts if someone
 980          * has actually implemented this.
 981          */
 982         ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, 0, NULL, 0,
 983                             mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0, 0);
 984 }
 985
 986 static void ieee80211_update_sta_info(struct ieee80211_sub_if_data *sdata,
 987                                       struct ieee80211_mgmt *mgmt, size_t len,
 988                                       struct ieee80211_rx_status *rx_status,
 989                                       struct ieee802_11_elems *elems,
 990                                       struct ieee80211_channel *channel)
 991 {
 992         struct sta_info *sta;
 993         enum nl80211_band band = rx_status->band;
 994         enum nl80211_bss_scan_width scan_width;
 995         struct ieee80211_local *local = sdata->local;
 996         struct ieee80211_supported_band *sband;
 997         bool rates_updated = false;
 998         u32 supp_rates = 0;
 999
1000         if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
1001                 return;
1002
1003         if (!ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid))
1004                 return;
1005
1006         sband = local->hw.wiphy->bands[band];
1007         if (WARN_ON(!sband))
1008                 return;
1009
1010         rcu_read_lock();
1011         sta = sta_info_get(sdata, mgmt->sa);
1012
1013         if (elems->supp_rates) {
1014                 supp_rates = ieee80211_sta_get_rates(sdata, elems,
1015                                                      band, NULL);
1016                 if (sta) {
1017                         u32 prev_rates;
1018
1019                         prev_rates = sta->sta.supp_rates[band];
1020                         /* make sure mandatory rates are always added */
1021                         scan_width = NL80211_BSS_CHAN_WIDTH_20;
1022                         if (rx_status->bw == RATE_INFO_BW_5)
1023                                 scan_width = NL80211_BSS_CHAN_WIDTH_5;
1024                         else if (rx_status->bw == RATE_INFO_BW_10)
1025                                 scan_width = NL80211_BSS_CHAN_WIDTH_10;
1026
1027                         sta->sta.supp_rates[band] = supp_rates |
1028                                 ieee80211_mandatory_rates(sband, scan_width);
1029                         if (sta->sta.supp_rates[band] != prev_rates) {
1030                                 ibss_dbg(sdata,
1031                                          "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n",
1032                                          sta->sta.addr, prev_rates,
1033                                          sta->sta.supp_rates[band]);
1034                                 rates_updated = true;
1035                         }
1036                 } else {
1037                         rcu_read_unlock();
1038                         sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid,
1039                                                      mgmt->sa, supp_rates);
1040                 }
1041         }
1042
1043         if (sta && !sta->sta.wme &&
1044             elems->wmm_info && local->hw.queues >= IEEE80211_NUM_ACS) {
1045                 sta->sta.wme = true;
1046                 ieee80211_check_fast_xmit(sta);
1047         }
1048
1049         if (sta && elems->ht_operation && elems->ht_cap_elem &&
1050             sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20_NOHT &&
1051             sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_5 &&
1052             sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_10) {
1053                 /* we both use HT */
1054                 struct ieee80211_ht_cap htcap_ie;
1055                 struct cfg80211_chan_def chandef;
1056                 enum ieee80211_sta_rx_bandwidth bw = sta->sta.bandwidth;
1057
1058                 cfg80211_chandef_create(&chandef, channel, NL80211_CHAN_NO_HT);
1059                 ieee80211_chandef_ht_oper(elems->ht_operation, &chandef);
1060
1061                 memcpy(&htcap_ie, elems->ht_cap_elem, sizeof(htcap_ie));
1062                 rates_updated |= ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
1063                                                                    &htcap_ie,
1064                                                                    sta);
1065
1066                 if (elems->vht_operation && elems->vht_cap_elem &&
1067                     sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20 &&
1068                     sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_40) {
1069                         /* we both use VHT */
1070                         struct ieee80211_vht_cap cap_ie;
1071                         struct ieee80211_sta_vht_cap cap = sta->sta.vht_cap;
1072
1073                         ieee80211_chandef_vht_oper(&local->hw,
1074                                                    elems->vht_operation,
1075                                                    elems->ht_operation,
1076                                                    &chandef);
1077                         memcpy(&cap_ie, elems->vht_cap_elem, sizeof(cap_ie));
1078                         ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
1079                                                             &cap_ie, sta);
1080                         if (memcmp(&cap, &sta->sta.vht_cap, sizeof(cap)))
1081                                 rates_updated |= true;
1082                 }
1083
1084                 if (bw != sta->sta.bandwidth)
1085                         rates_updated |= true;
1086
1087                 if (!cfg80211_chandef_compatible(&sdata->u.ibss.chandef,
1088                                                  &chandef))
1089                         WARN_ON_ONCE(1);
1090         }
1091
1092         if (sta && rates_updated) {
1093                 u32 changed = IEEE80211_RC_SUPP_RATES_CHANGED;
1094                 u8 rx_nss = sta->sta.rx_nss;
1095
1096                 /* Force rx_nss recalculation */
1097                 sta->sta.rx_nss = 0;
1098                 rate_control_rate_init(sta);
1099                 if (sta->sta.rx_nss != rx_nss)
1100                         changed |= IEEE80211_RC_NSS_CHANGED;
1101
1102                 drv_sta_rc_update(local, sdata, &sta->sta, changed);
1103         }
1104
1105         rcu_read_unlock();
1106 }
1107
1108 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1109                                   struct ieee80211_mgmt *mgmt, size_t len,
1110                                   struct ieee80211_rx_status *rx_status,
1111                                   struct ieee802_11_elems *elems)
1112 {
1113         struct ieee80211_local *local = sdata->local;
1114         struct cfg80211_bss *cbss;
1115         struct ieee80211_bss *bss;
1116         struct ieee80211_channel *channel;
1117         u64 beacon_timestamp, rx_timestamp;
1118         u32 supp_rates = 0;
1119         enum nl80211_band band = rx_status->band;
1120
1121         channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
1122         if (!channel)
1123                 return;
1124
1125         ieee80211_update_sta_info(sdata, mgmt, len, rx_status, elems, channel);
1126
1127         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1128                                         channel);
1129         if (!bss)
1130                 return;
1131
1132         cbss = container_of((void *)bss, struct cfg80211_bss, priv);
1133
1134         /* same for beacon and probe response */
1135         beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp);
1136
1137         /* check if we need to merge IBSS */
1138
1139         /* not an IBSS */
1140         if (!(cbss->capability & WLAN_CAPABILITY_IBSS))
1141                 goto put_bss;
1142
1143         /* different channel */
1144         if (sdata->u.ibss.fixed_channel &&
1145             sdata->u.ibss.chandef.chan != cbss->channel)
1146                 goto put_bss;
1147
1148         /* different SSID */
1149         if (elems->ssid_len != sdata->u.ibss.ssid_len ||
1150             memcmp(elems->ssid, sdata->u.ibss.ssid,
1151                                 sdata->u.ibss.ssid_len))
1152                 goto put_bss;
1153
1154         /* process channel switch */
1155         if (sdata->vif.csa_active ||
1156             ieee80211_ibss_process_chanswitch(sdata, elems, true))
1157                 goto put_bss;
1158
1159         /* same BSSID */
1160         if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid))
1161                 goto put_bss;
1162
1163         /* we use a fixed BSSID */
1164         if (sdata->u.ibss.fixed_bssid)
1165                 goto put_bss;
1166
1167         if (ieee80211_have_rx_timestamp(rx_status)) {
1168                 /* time when timestamp field was received */
1169                 rx_timestamp =
1170                         ieee80211_calculate_rx_timestamp(local, rx_status,
1171                                                          len + FCS_LEN, 24);
1172         } else {
1173                 /*
1174                  * second best option: get current TSF
1175                  * (will return -1 if not supported)
1176                  */
1177                 rx_timestamp = drv_get_tsf(local, sdata);
1178         }
1179
1180         ibss_dbg(sdata, "RX beacon SA=%pM BSSID=%pM TSF=0x%llx\n",
1181                  mgmt->sa, mgmt->bssid,
1182                  (unsigned long long)rx_timestamp);
1183         ibss_dbg(sdata, "\tBCN=0x%llx diff=%lld @%lu\n",
1184                  (unsigned long long)beacon_timestamp,
1185                  (unsigned long long)(rx_timestamp - beacon_timestamp),
1186                  jiffies);
1187
1188         if (beacon_timestamp > rx_timestamp) {
1189                 ibss_dbg(sdata,
1190                          "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n",
1191                          mgmt->bssid);
1192                 ieee80211_sta_join_ibss(sdata, bss);
1193                 supp_rates = ieee80211_sta_get_rates(sdata, elems, band, NULL);
1194                 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa,
1195                                        supp_rates);
1196                 rcu_read_unlock();
1197         }
1198
1199  put_bss:
1200         ieee80211_rx_bss_put(local, bss);
1201 }
1202
1203 void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata,
1204                               const u8 *bssid, const u8 *addr,
1205                               u32 supp_rates)
1206 {
1207         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1208         struct ieee80211_local *local = sdata->local;
1209         struct sta_info *sta;
1210         struct ieee80211_chanctx_conf *chanctx_conf;
1211         struct ieee80211_supported_band *sband;
1212         enum nl80211_bss_scan_width scan_width;
1213         int band;
1214
1215         /*
1216          * XXX: Consider removing the least recently used entry and
1217          *      allow new one to be added.
1218          */
1219         if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
1220                 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
1221                                     sdata->name, addr);
1222                 return;
1223         }
1224
1225         if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH)
1226                 return;
1227
1228         if (!ether_addr_equal(bssid, sdata->u.ibss.bssid))
1229                 return;
1230
1231         rcu_read_lock();
1232         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1233         if (WARN_ON_ONCE(!chanctx_conf)) {
1234                 rcu_read_unlock();
1235                 return;
1236         }
1237         band = chanctx_conf->def.chan->band;
1238         scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
1239         rcu_read_unlock();
1240
1241         sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
1242         if (!sta)
1243                 return;
1244
1245         /* make sure mandatory rates are always added */
1246         sband = local->hw.wiphy->bands[band];
1247         sta->sta.supp_rates[band] = supp_rates |
1248                         ieee80211_mandatory_rates(sband, scan_width);
1249
1250         spin_lock(&ifibss->incomplete_lock);
1251         list_add(&sta->list, &ifibss->incomplete_stations);
1252         spin_unlock(&ifibss->incomplete_lock);
1253         ieee80211_queue_work(&local->hw, &sdata->work);
1254 }
1255
1256 static void ieee80211_ibss_sta_expire(struct ieee80211_sub_if_data *sdata)
1257 {
1258         struct ieee80211_local *local = sdata->local;
1259         struct sta_info *sta, *tmp;
1260         unsigned long exp_time = IEEE80211_IBSS_INACTIVITY_LIMIT;
1261         unsigned long exp_rsn = IEEE80211_IBSS_RSN_INACTIVITY_LIMIT;
1262
1263         mutex_lock(&local->sta_mtx);
1264
1265         list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
1266                 unsigned long last_active = ieee80211_sta_last_active(sta);
1267
1268                 if (sdata != sta->sdata)
1269                         continue;
1270
1271                 if (time_is_before_jiffies(last_active + exp_time) ||
1272                     (time_is_before_jiffies(last_active + exp_rsn) &&
1273                      sta->sta_state != IEEE80211_STA_AUTHORIZED)) {
1274                         sta_dbg(sta->sdata, "expiring inactive %sSTA %pM\n",
1275                                 sta->sta_state != IEEE80211_STA_AUTHORIZED ?
1276                                 "not authorized " : "", sta->sta.addr);
1277
1278                         WARN_ON(__sta_info_destroy(sta));
1279                 }
1280         }
1281
1282         mutex_unlock(&local->sta_mtx);
1283 }
1284
1285 /*
1286  * This function is called with state == IEEE80211_IBSS_MLME_JOINED
1287  */
1288
1289 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
1290 {
1291         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1292         enum nl80211_bss_scan_width scan_width;
1293
1294         sdata_assert_lock(sdata);
1295
1296         mod_timer(&ifibss->timer,
1297                   round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
1298
1299         ieee80211_ibss_sta_expire(sdata);
1300
1301         if (time_before(jiffies, ifibss->last_scan_completed +
1302                        IEEE80211_IBSS_MERGE_INTERVAL))
1303                 return;
1304
1305         if (ieee80211_sta_active_ibss(sdata))
1306                 return;
1307
1308         if (ifibss->fixed_channel)
1309                 return;
1310
1311         sdata_info(sdata,
1312                    "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n");
1313
1314         scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
1315         ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len,
1316                                     NULL, 0, scan_width);
1317 }
1318
1319 static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
1320 {
1321         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1322         u8 bssid[ETH_ALEN];
1323         u16 capability;
1324         int i;
1325
1326         sdata_assert_lock(sdata);
1327
1328         if (ifibss->fixed_bssid) {
1329                 memcpy(bssid, ifibss->bssid, ETH_ALEN);
1330         } else {
1331                 /* Generate random, not broadcast, locally administered BSSID. Mix in
1332                  * own MAC address to make sure that devices that do not have proper
1333                  * random number generator get different BSSID. */
1334                 get_random_bytes(bssid, ETH_ALEN);
1335                 for (i = 0; i < ETH_ALEN; i++)
1336                         bssid[i] ^= sdata->vif.addr[i];
1337                 bssid[0] &= ~0x01;
1338                 bssid[0] |= 0x02;
1339         }
1340
1341         sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid);
1342
1343         capability = WLAN_CAPABILITY_IBSS;
1344
1345         if (ifibss->privacy)
1346                 capability |= WLAN_CAPABILITY_PRIVACY;
1347
1348         __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int,
1349                                   &ifibss->chandef, ifibss->basic_rates,
1350                                   capability, 0, true);
1351 }
1352
1353 static unsigned ibss_setup_channels(struct wiphy *wiphy,
1354                                     struct ieee80211_channel **channels,
1355                                     unsigned int channels_max,
1356                                     u32 center_freq, u32 width)
1357 {
1358         struct ieee80211_channel *chan = NULL;
1359         unsigned int n_chan = 0;
1360         u32 start_freq, end_freq, freq;
1361
1362         if (width <= 20) {
1363                 start_freq = center_freq;
1364                 end_freq = center_freq;
1365         } else {
1366                 start_freq = center_freq - width / 2 + 10;
1367                 end_freq = center_freq + width / 2 - 10;
1368         }
1369
1370         for (freq = start_freq; freq <= end_freq; freq += 20) {
1371                 chan = ieee80211_get_channel(wiphy, freq);
1372                 if (!chan)
1373                         continue;
1374                 if (n_chan >= channels_max)
1375                         return n_chan;
1376
1377                 channels[n_chan] = chan;
1378                 n_chan++;
1379         }
1380
1381         return n_chan;
1382 }
1383
1384 static unsigned int
1385 ieee80211_ibss_setup_scan_channels(struct wiphy *wiphy,
1386                                    const struct cfg80211_chan_def *chandef,
1387                                    struct ieee80211_channel **channels,
1388                                    unsigned int channels_max)
1389 {
1390         unsigned int n_chan = 0;
1391         u32 width, cf1, cf2 = 0;
1392
1393         switch (chandef->width) {
1394         case NL80211_CHAN_WIDTH_40:
1395                 width = 40;
1396                 break;
1397         case NL80211_CHAN_WIDTH_80P80:
1398                 cf2 = chandef->center_freq2;
1399                 /* fall through */
1400         case NL80211_CHAN_WIDTH_80:
1401                 width = 80;
1402                 break;
1403         case NL80211_CHAN_WIDTH_160:
1404                 width = 160;
1405                 break;
1406         default:
1407                 width = 20;
1408                 break;
1409         }
1410
1411         cf1 = chandef->center_freq1;
1412
1413         n_chan = ibss_setup_channels(wiphy, channels, channels_max, cf1, width);
1414
1415         if (cf2)
1416                 n_chan += ibss_setup_channels(wiphy, &channels[n_chan],
1417                                               channels_max - n_chan, cf2,
1418                                               width);
1419
1420         return n_chan;
1421 }
1422
1423 /*
1424  * This function is called with state == IEEE80211_IBSS_MLME_SEARCH
1425  */
1426
1427 static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
1428 {
1429         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1430         struct ieee80211_local *local = sdata->local;
1431         struct cfg80211_bss *cbss;
1432         struct ieee80211_channel *chan = NULL;
1433         const u8 *bssid = NULL;
1434         enum nl80211_bss_scan_width scan_width;
1435         int active_ibss;
1436
1437         sdata_assert_lock(sdata);
1438
1439         active_ibss = ieee80211_sta_active_ibss(sdata);
1440         ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss);
1441
1442         if (active_ibss)
1443                 return;
1444
1445         if (ifibss->fixed_bssid)
1446                 bssid = ifibss->bssid;
1447         if (ifibss->fixed_channel)
1448                 chan = ifibss->chandef.chan;
1449         if (!is_zero_ether_addr(ifibss->bssid))
1450                 bssid = ifibss->bssid;
1451         cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid,
1452                                 ifibss->ssid, ifibss->ssid_len,
1453                                 IEEE80211_BSS_TYPE_IBSS,
1454                                 IEEE80211_PRIVACY(ifibss->privacy));
1455
1456         if (cbss) {
1457                 struct ieee80211_bss *bss;
1458
1459                 bss = (void *)cbss->priv;
1460                 ibss_dbg(sdata,
1461                          "sta_find_ibss: selected %pM current %pM\n",
1462                          cbss->bssid, ifibss->bssid);
1463                 sdata_info(sdata,
1464                            "Selected IBSS BSSID %pM based on configured SSID\n",
1465                            cbss->bssid);
1466
1467                 ieee80211_sta_join_ibss(sdata, bss);
1468                 ieee80211_rx_bss_put(local, bss);
1469                 return;
1470         }
1471
1472         /* if a fixed bssid and a fixed freq have been provided create the IBSS
1473          * directly and do not waste time scanning
1474          */
1475         if (ifibss->fixed_bssid && ifibss->fixed_channel) {
1476                 sdata_info(sdata, "Created IBSS using preconfigured BSSID %pM\n",
1477                            bssid);
1478                 ieee80211_sta_create_ibss(sdata);
1479                 return;
1480         }
1481
1482
1483         ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n");
1484
1485         /* Selected IBSS not found in current scan results - try to scan */
1486         if (time_after(jiffies, ifibss->last_scan_completed +
1487                                         IEEE80211_SCAN_INTERVAL)) {
1488                 struct ieee80211_channel *channels[8];
1489                 unsigned int num;
1490
1491                 sdata_info(sdata, "Trigger new scan to find an IBSS to join\n");
1492
1493                 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
1494
1495                 if (ifibss->fixed_channel) {
1496                         num = ieee80211_ibss_setup_scan_channels(local->hw.wiphy,
1497                                                                  &ifibss->chandef,
1498                                                                  channels,
1499                                                                  ARRAY_SIZE(channels));
1500                         ieee80211_request_ibss_scan(sdata, ifibss->ssid,
1501                                                     ifibss->ssid_len, channels,
1502                                                     num, scan_width);
1503                 } else {
1504                         ieee80211_request_ibss_scan(sdata, ifibss->ssid,
1505                                                     ifibss->ssid_len, NULL,
1506                                                     0, scan_width);
1507                 }
1508         } else {
1509                 int interval = IEEE80211_SCAN_INTERVAL;
1510
1511                 if (time_after(jiffies, ifibss->ibss_join_req +
1512                                IEEE80211_IBSS_JOIN_TIMEOUT))
1513                         ieee80211_sta_create_ibss(sdata);
1514
1515                 mod_timer(&ifibss->timer,
1516                           round_jiffies(jiffies + interval));
1517         }
1518 }
1519
1520 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
1521                                         struct sk_buff *req)
1522 {
1523         struct ieee80211_mgmt *mgmt = (void *)req->data;
1524         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1525         struct ieee80211_local *local = sdata->local;
1526         int tx_last_beacon, len = req->len;
1527         struct sk_buff *skb;
1528         struct beacon_data *presp;
1529         u8 *pos, *end;
1530
1531         sdata_assert_lock(sdata);
1532
1533         presp = rcu_dereference_protected(ifibss->presp,
1534                                           lockdep_is_held(&sdata->wdev.mtx));
1535
1536         if (ifibss->state != IEEE80211_IBSS_MLME_JOINED ||
1537             len < 24 + 2 || !presp)
1538                 return;
1539
1540         tx_last_beacon = drv_tx_last_beacon(local);
1541
1542         ibss_dbg(sdata, "RX ProbeReq SA=%pM DA=%pM\n", mgmt->sa, mgmt->da);
1543         ibss_dbg(sdata, "\tBSSID=%pM (tx_last_beacon=%d)\n",
1544                  mgmt->bssid, tx_last_beacon);
1545
1546         if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da))
1547                 return;
1548
1549         if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) &&
1550             !is_broadcast_ether_addr(mgmt->bssid))
1551                 return;
1552
1553         end = ((u8 *) mgmt) + len;
1554         pos = mgmt->u.probe_req.variable;
1555         if (pos[0] != WLAN_EID_SSID ||
1556             pos + 2 + pos[1] > end) {
1557                 ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n",
1558                          mgmt->sa);
1559                 return;
1560         }
1561         if (pos[1] != 0 &&
1562             (pos[1] != ifibss->ssid_len ||
1563              memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) {
1564                 /* Ignore ProbeReq for foreign SSID */
1565                 return;
1566         }
1567
1568         /* Reply with ProbeResp */
1569         skb = dev_alloc_skb(local->tx_headroom + presp->head_len);
1570         if (!skb)
1571                 return;
1572
1573         skb_reserve(skb, local->tx_headroom);
1574         skb_put_data(skb, presp->head, presp->head_len);
1575
1576         memcpy(((struct ieee80211_mgmt *) skb->data)->da, mgmt->sa, ETH_ALEN);
1577         ibss_dbg(sdata, "Sending ProbeResp to %pM\n", mgmt->sa);
1578         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1579
1580         /* avoid excessive retries for probe request to wildcard SSIDs */
1581         if (pos[1] == 0)
1582                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_NO_ACK;
1583
1584         ieee80211_tx_skb(sdata, skb);
1585 }
1586
1587 static
1588 void ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data *sdata,
1589                                     struct ieee80211_mgmt *mgmt, size_t len,
1590                                     struct ieee80211_rx_status *rx_status)
1591 {
1592         size_t baselen;
1593         struct ieee802_11_elems elems;
1594
1595         BUILD_BUG_ON(offsetof(typeof(mgmt->u.probe_resp), variable) !=
1596                      offsetof(typeof(mgmt->u.beacon), variable));
1597
1598         /*
1599          * either beacon or probe_resp but the variable field is at the
1600          * same offset
1601          */
1602         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1603         if (baselen > len)
1604                 return;
1605
1606         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1607                                false, &elems);
1608
1609         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
1610 }
1611
1612 void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1613                                    struct sk_buff *skb)
1614 {
1615         struct ieee80211_rx_status *rx_status;
1616         struct ieee80211_mgmt *mgmt;
1617         u16 fc;
1618         struct ieee802_11_elems elems;
1619         int ies_len;
1620
1621         rx_status = IEEE80211_SKB_RXCB(skb);
1622         mgmt = (struct ieee80211_mgmt *) skb->data;
1623         fc = le16_to_cpu(mgmt->frame_control);
1624
1625         sdata_lock(sdata);
1626
1627         if (!sdata->u.ibss.ssid_len)
1628                 goto mgmt_out; /* not ready to merge yet */
1629
1630         switch (fc & IEEE80211_FCTL_STYPE) {
1631         case IEEE80211_STYPE_PROBE_REQ:
1632                 ieee80211_rx_mgmt_probe_req(sdata, skb);
1633                 break;
1634         case IEEE80211_STYPE_PROBE_RESP:
1635         case IEEE80211_STYPE_BEACON:
1636                 ieee80211_rx_mgmt_probe_beacon(sdata, mgmt, skb->len,
1637                                                rx_status);
1638                 break;
1639         case IEEE80211_STYPE_AUTH:
1640                 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len);
1641                 break;
1642         case IEEE80211_STYPE_DEAUTH:
1643                 ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len);
1644                 break;
1645         case IEEE80211_STYPE_ACTION:
1646                 switch (mgmt->u.action.category) {
1647                 case WLAN_CATEGORY_SPECTRUM_MGMT:
1648                         ies_len = skb->len -
1649                                   offsetof(struct ieee80211_mgmt,
1650                                            u.action.u.chan_switch.variable);
1651
1652                         if (ies_len < 0)
1653                                 break;
1654
1655                         ieee802_11_parse_elems(
1656                                 mgmt->u.action.u.chan_switch.variable,
1657                                 ies_len, true, &elems);
1658
1659                         if (elems.parse_error)
1660                                 break;
1661
1662                         ieee80211_rx_mgmt_spectrum_mgmt(sdata, mgmt, skb->len,
1663                                                         rx_status, &elems);
1664                         break;
1665                 }
1666         }
1667
1668  mgmt_out:
1669         sdata_unlock(sdata);
1670 }
1671
1672 void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata)
1673 {
1674         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1675         struct sta_info *sta;
1676
1677         sdata_lock(sdata);
1678
1679         /*
1680          * Work could be scheduled after scan or similar
1681          * when we aren't even joined (or trying) with a
1682          * network.
1683          */
1684         if (!ifibss->ssid_len)
1685                 goto out;
1686
1687         spin_lock_bh(&ifibss->incomplete_lock);
1688         while (!list_empty(&ifibss->incomplete_stations)) {
1689                 sta = list_first_entry(&ifibss->incomplete_stations,
1690                                        struct sta_info, list);
1691                 list_del(&sta->list);
1692                 spin_unlock_bh(&ifibss->incomplete_lock);
1693
1694                 ieee80211_ibss_finish_sta(sta);
1695                 rcu_read_unlock();
1696                 spin_lock_bh(&ifibss->incomplete_lock);
1697         }
1698         spin_unlock_bh(&ifibss->incomplete_lock);
1699
1700         switch (ifibss->state) {
1701         case IEEE80211_IBSS_MLME_SEARCH:
1702                 ieee80211_sta_find_ibss(sdata);
1703                 break;
1704         case IEEE80211_IBSS_MLME_JOINED:
1705                 ieee80211_sta_merge_ibss(sdata);
1706                 break;
1707         default:
1708                 WARN_ON(1);
1709                 break;
1710         }
1711
1712  out:
1713         sdata_unlock(sdata);
1714 }
1715
1716 static void ieee80211_ibss_timer(struct timer_list *t)
1717 {
1718         struct ieee80211_sub_if_data *sdata =
1719                 from_timer(sdata, t, u.ibss.timer);
1720
1721         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1722 }
1723
1724 void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata)
1725 {
1726         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1727
1728         timer_setup(&ifibss->timer, ieee80211_ibss_timer, 0);
1729         INIT_LIST_HEAD(&ifibss->incomplete_stations);
1730         spin_lock_init(&ifibss->incomplete_lock);
1731         INIT_WORK(&ifibss->csa_connection_drop_work,
1732                   ieee80211_csa_connection_drop_work);
1733 }
1734
1735 /* scan finished notification */
1736 void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local)
1737 {
1738         struct ieee80211_sub_if_data *sdata;
1739
1740         mutex_lock(&local->iflist_mtx);
1741         list_for_each_entry(sdata, &local->interfaces, list) {
1742                 if (!ieee80211_sdata_running(sdata))
1743                         continue;
1744                 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
1745                         continue;
1746                 sdata->u.ibss.last_scan_completed = jiffies;
1747         }
1748         mutex_unlock(&local->iflist_mtx);
1749 }
1750
1751 int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
1752                         struct cfg80211_ibss_params *params)
1753 {
1754         u32 changed = 0;
1755         u32 rate_flags;
1756         struct ieee80211_supported_band *sband;
1757         enum ieee80211_chanctx_mode chanmode;
1758         struct ieee80211_local *local = sdata->local;
1759         int radar_detect_width = 0;
1760         int i;
1761         int ret;
1762
1763         ret = cfg80211_chandef_dfs_required(local->hw.wiphy,
1764                                             &params->chandef,
1765                                             sdata->wdev.iftype);
1766         if (ret < 0)
1767                 return ret;
1768
1769         if (ret > 0) {
1770                 if (!params->userspace_handles_dfs)
1771                         return -EINVAL;
1772                 radar_detect_width = BIT(params->chandef.width);
1773         }
1774
1775         chanmode = (params->channel_fixed && !ret) ?
1776                 IEEE80211_CHANCTX_SHARED : IEEE80211_CHANCTX_EXCLUSIVE;
1777
1778         mutex_lock(&local->chanctx_mtx);
1779         ret = ieee80211_check_combinations(sdata, &params->chandef, chanmode,
1780                                            radar_detect_width);
1781         mutex_unlock(&local->chanctx_mtx);
1782         if (ret < 0)
1783                 return ret;
1784
1785         if (params->bssid) {
1786                 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN);
1787                 sdata->u.ibss.fixed_bssid = true;
1788         } else
1789                 sdata->u.ibss.fixed_bssid = false;
1790
1791         sdata->u.ibss.privacy = params->privacy;
1792         sdata->u.ibss.control_port = params->control_port;
1793         sdata->u.ibss.userspace_handles_dfs = params->userspace_handles_dfs;
1794         sdata->u.ibss.basic_rates = params->basic_rates;
1795         sdata->u.ibss.last_scan_completed = jiffies;
1796
1797         /* fix basic_rates if channel does not support these rates */
1798         rate_flags = ieee80211_chandef_rate_flags(&params->chandef);
1799         sband = local->hw.wiphy->bands[params->chandef.chan->band];
1800         for (i = 0; i < sband->n_bitrates; i++) {
1801                 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
1802                         sdata->u.ibss.basic_rates &= ~BIT(i);
1803         }
1804         memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate,
1805                sizeof(params->mcast_rate));
1806
1807         sdata->vif.bss_conf.beacon_int = params->beacon_interval;
1808
1809         sdata->u.ibss.chandef = params->chandef;
1810         sdata->u.ibss.fixed_channel = params->channel_fixed;
1811
1812         if (params->ie) {
1813                 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len,
1814                                            GFP_KERNEL);
1815                 if (sdata->u.ibss.ie)
1816                         sdata->u.ibss.ie_len = params->ie_len;
1817         }
1818
1819         sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
1820         sdata->u.ibss.ibss_join_req = jiffies;
1821
1822         memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len);
1823         sdata->u.ibss.ssid_len = params->ssid_len;
1824
1825         memcpy(&sdata->u.ibss.ht_capa, &params->ht_capa,
1826                sizeof(sdata->u.ibss.ht_capa));
1827         memcpy(&sdata->u.ibss.ht_capa_mask, &params->ht_capa_mask,
1828                sizeof(sdata->u.ibss.ht_capa_mask));
1829
1830         /*
1831          * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is
1832          * reserved, but an HT STA shall protect HT transmissions as though
1833          * the HT Protection field were set to non-HT mixed mode.
1834          *
1835          * In an IBSS, the RIFS Mode field of the HT Operation element is
1836          * also reserved, but an HT STA shall operate as though this field
1837          * were set to 1.
1838          */
1839
1840         sdata->vif.bss_conf.ht_operation_mode |=
1841                   IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED
1842                 | IEEE80211_HT_PARAM_RIFS_MODE;
1843
1844         changed |= BSS_CHANGED_HT | BSS_CHANGED_MCAST_RATE;
1845         ieee80211_bss_info_change_notify(sdata, changed);
1846
1847         sdata->smps_mode = IEEE80211_SMPS_OFF;
1848         sdata->needed_rx_chains = local->rx_chains;
1849         sdata->control_port_over_nl80211 = params->control_port_over_nl80211;
1850
1851         ieee80211_queue_work(&local->hw, &sdata->work);
1852
1853         return 0;
1854 }
1855
1856 int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata)
1857 {
1858         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1859
1860         ieee80211_ibss_disconnect(sdata);
1861         ifibss->ssid_len = 0;
1862         eth_zero_addr(ifibss->bssid);
1863
1864         /* remove beacon */
1865         kfree(sdata->u.ibss.ie);
1866
1867         /* on the next join, re-program HT parameters */
1868         memset(&ifibss->ht_capa, 0, sizeof(ifibss->ht_capa));
1869         memset(&ifibss->ht_capa_mask, 0, sizeof(ifibss->ht_capa_mask));
1870
1871         synchronize_rcu();
1872
1873         skb_queue_purge(&sdata->skb_queue);
1874
1875         del_timer_sync(&sdata->u.ibss.timer);
1876
1877         return 0;
1878 }