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 BSSID=%pM (reason: %d)\n",
 951                  mgmt->sa, mgmt->da, 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,
 970                  "RX Auth SA=%pM DA=%pM BSSID=%pM (auth_transaction=%d)\n",
 971                  mgmt->sa, mgmt->da, 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(elems->vht_operation,
1074                                                    &chandef);
1075                         memcpy(&cap_ie, elems->vht_cap_elem, sizeof(cap_ie));
1076                         ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
1077                                                             &cap_ie, sta);
1078                         if (memcmp(&cap, &sta->sta.vht_cap, sizeof(cap)))
1079                                 rates_updated |= true;
1080                 }
1081
1082                 if (bw != sta->sta.bandwidth)
1083                         rates_updated |= true;
1084
1085                 if (!cfg80211_chandef_compatible(&sdata->u.ibss.chandef,
1086                                                  &chandef))
1087                         WARN_ON_ONCE(1);
1088         }
1089
1090         if (sta && rates_updated) {
1091                 u32 changed = IEEE80211_RC_SUPP_RATES_CHANGED;
1092                 u8 rx_nss = sta->sta.rx_nss;
1093
1094                 /* Force rx_nss recalculation */
1095                 sta->sta.rx_nss = 0;
1096                 rate_control_rate_init(sta);
1097                 if (sta->sta.rx_nss != rx_nss)
1098                         changed |= IEEE80211_RC_NSS_CHANGED;
1099
1100                 drv_sta_rc_update(local, sdata, &sta->sta, changed);
1101         }
1102
1103         rcu_read_unlock();
1104 }
1105
1106 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1107                                   struct ieee80211_mgmt *mgmt, size_t len,
1108                                   struct ieee80211_rx_status *rx_status,
1109                                   struct ieee802_11_elems *elems)
1110 {
1111         struct ieee80211_local *local = sdata->local;
1112         struct cfg80211_bss *cbss;
1113         struct ieee80211_bss *bss;
1114         struct ieee80211_channel *channel;
1115         u64 beacon_timestamp, rx_timestamp;
1116         u32 supp_rates = 0;
1117         enum nl80211_band band = rx_status->band;
1118
1119         channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
1120         if (!channel)
1121                 return;
1122
1123         ieee80211_update_sta_info(sdata, mgmt, len, rx_status, elems, channel);
1124
1125         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1126                                         channel);
1127         if (!bss)
1128                 return;
1129
1130         cbss = container_of((void *)bss, struct cfg80211_bss, priv);
1131
1132         /* same for beacon and probe response */
1133         beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp);
1134
1135         /* check if we need to merge IBSS */
1136
1137         /* not an IBSS */
1138         if (!(cbss->capability & WLAN_CAPABILITY_IBSS))
1139                 goto put_bss;
1140
1141         /* different channel */
1142         if (sdata->u.ibss.fixed_channel &&
1143             sdata->u.ibss.chandef.chan != cbss->channel)
1144                 goto put_bss;
1145
1146         /* different SSID */
1147         if (elems->ssid_len != sdata->u.ibss.ssid_len ||
1148             memcmp(elems->ssid, sdata->u.ibss.ssid,
1149                                 sdata->u.ibss.ssid_len))
1150                 goto put_bss;
1151
1152         /* process channel switch */
1153         if (sdata->vif.csa_active ||
1154             ieee80211_ibss_process_chanswitch(sdata, elems, true))
1155                 goto put_bss;
1156
1157         /* same BSSID */
1158         if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid))
1159                 goto put_bss;
1160
1161         /* we use a fixed BSSID */
1162         if (sdata->u.ibss.fixed_bssid)
1163                 goto put_bss;
1164
1165         if (ieee80211_have_rx_timestamp(rx_status)) {
1166                 /* time when timestamp field was received */
1167                 rx_timestamp =
1168                         ieee80211_calculate_rx_timestamp(local, rx_status,
1169                                                          len + FCS_LEN, 24);
1170         } else {
1171                 /*
1172                  * second best option: get current TSF
1173                  * (will return -1 if not supported)
1174                  */
1175                 rx_timestamp = drv_get_tsf(local, sdata);
1176         }
1177
1178         ibss_dbg(sdata,
1179                  "RX beacon SA=%pM BSSID=%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
1180                  mgmt->sa, mgmt->bssid,
1181                  (unsigned long long)rx_timestamp,
1182                  (unsigned long long)beacon_timestamp,
1183                  (unsigned long long)(rx_timestamp - beacon_timestamp),
1184                  jiffies);
1185
1186         if (beacon_timestamp > rx_timestamp) {
1187                 ibss_dbg(sdata,
1188                          "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n",
1189                          mgmt->bssid);
1190                 ieee80211_sta_join_ibss(sdata, bss);
1191                 supp_rates = ieee80211_sta_get_rates(sdata, elems, band, NULL);
1192                 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa,
1193                                        supp_rates);
1194                 rcu_read_unlock();
1195         }
1196
1197  put_bss:
1198         ieee80211_rx_bss_put(local, bss);
1199 }
1200
1201 void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata,
1202                               const u8 *bssid, const u8 *addr,
1203                               u32 supp_rates)
1204 {
1205         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1206         struct ieee80211_local *local = sdata->local;
1207         struct sta_info *sta;
1208         struct ieee80211_chanctx_conf *chanctx_conf;
1209         struct ieee80211_supported_band *sband;
1210         enum nl80211_bss_scan_width scan_width;
1211         int band;
1212
1213         /*
1214          * XXX: Consider removing the least recently used entry and
1215          *      allow new one to be added.
1216          */
1217         if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
1218                 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
1219                                     sdata->name, addr);
1220                 return;
1221         }
1222
1223         if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH)
1224                 return;
1225
1226         if (!ether_addr_equal(bssid, sdata->u.ibss.bssid))
1227                 return;
1228
1229         rcu_read_lock();
1230         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1231         if (WARN_ON_ONCE(!chanctx_conf)) {
1232                 rcu_read_unlock();
1233                 return;
1234         }
1235         band = chanctx_conf->def.chan->band;
1236         scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
1237         rcu_read_unlock();
1238
1239         sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
1240         if (!sta)
1241                 return;
1242
1243         /* make sure mandatory rates are always added */
1244         sband = local->hw.wiphy->bands[band];
1245         sta->sta.supp_rates[band] = supp_rates |
1246                         ieee80211_mandatory_rates(sband, scan_width);
1247
1248         spin_lock(&ifibss->incomplete_lock);
1249         list_add(&sta->list, &ifibss->incomplete_stations);
1250         spin_unlock(&ifibss->incomplete_lock);
1251         ieee80211_queue_work(&local->hw, &sdata->work);
1252 }
1253
1254 static void ieee80211_ibss_sta_expire(struct ieee80211_sub_if_data *sdata)
1255 {
1256         struct ieee80211_local *local = sdata->local;
1257         struct sta_info *sta, *tmp;
1258         unsigned long exp_time = IEEE80211_IBSS_INACTIVITY_LIMIT;
1259         unsigned long exp_rsn = IEEE80211_IBSS_RSN_INACTIVITY_LIMIT;
1260
1261         mutex_lock(&local->sta_mtx);
1262
1263         list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
1264                 unsigned long last_active = ieee80211_sta_last_active(sta);
1265
1266                 if (sdata != sta->sdata)
1267                         continue;
1268
1269                 if (time_is_before_jiffies(last_active + exp_time) ||
1270                     (time_is_before_jiffies(last_active + exp_rsn) &&
1271                      sta->sta_state != IEEE80211_STA_AUTHORIZED)) {
1272                         sta_dbg(sta->sdata, "expiring inactive %sSTA %pM\n",
1273                                 sta->sta_state != IEEE80211_STA_AUTHORIZED ?
1274                                 "not authorized " : "", sta->sta.addr);
1275
1276                         WARN_ON(__sta_info_destroy(sta));
1277                 }
1278         }
1279
1280         mutex_unlock(&local->sta_mtx);
1281 }
1282
1283 /*
1284  * This function is called with state == IEEE80211_IBSS_MLME_JOINED
1285  */
1286
1287 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
1288 {
1289         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1290         enum nl80211_bss_scan_width scan_width;
1291
1292         sdata_assert_lock(sdata);
1293
1294         mod_timer(&ifibss->timer,
1295                   round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
1296
1297         ieee80211_ibss_sta_expire(sdata);
1298
1299         if (time_before(jiffies, ifibss->last_scan_completed +
1300                        IEEE80211_IBSS_MERGE_INTERVAL))
1301                 return;
1302
1303         if (ieee80211_sta_active_ibss(sdata))
1304                 return;
1305
1306         if (ifibss->fixed_channel)
1307                 return;
1308
1309         sdata_info(sdata,
1310                    "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n");
1311
1312         scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
1313         ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len,
1314                                     NULL, 0, scan_width);
1315 }
1316
1317 static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
1318 {
1319         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1320         u8 bssid[ETH_ALEN];
1321         u16 capability;
1322         int i;
1323
1324         sdata_assert_lock(sdata);
1325
1326         if (ifibss->fixed_bssid) {
1327                 memcpy(bssid, ifibss->bssid, ETH_ALEN);
1328         } else {
1329                 /* Generate random, not broadcast, locally administered BSSID. Mix in
1330                  * own MAC address to make sure that devices that do not have proper
1331                  * random number generator get different BSSID. */
1332                 get_random_bytes(bssid, ETH_ALEN);
1333                 for (i = 0; i < ETH_ALEN; i++)
1334                         bssid[i] ^= sdata->vif.addr[i];
1335                 bssid[0] &= ~0x01;
1336                 bssid[0] |= 0x02;
1337         }
1338
1339         sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid);
1340
1341         capability = WLAN_CAPABILITY_IBSS;
1342
1343         if (ifibss->privacy)
1344                 capability |= WLAN_CAPABILITY_PRIVACY;
1345
1346         __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int,
1347                                   &ifibss->chandef, ifibss->basic_rates,
1348                                   capability, 0, true);
1349 }
1350
1351 static unsigned ibss_setup_channels(struct wiphy *wiphy,
1352                                     struct ieee80211_channel **channels,
1353                                     unsigned int channels_max,
1354                                     u32 center_freq, u32 width)
1355 {
1356         struct ieee80211_channel *chan = NULL;
1357         unsigned int n_chan = 0;
1358         u32 start_freq, end_freq, freq;
1359
1360         if (width <= 20) {
1361                 start_freq = center_freq;
1362                 end_freq = center_freq;
1363         } else {
1364                 start_freq = center_freq - width / 2 + 10;
1365                 end_freq = center_freq + width / 2 - 10;
1366         }
1367
1368         for (freq = start_freq; freq <= end_freq; freq += 20) {
1369                 chan = ieee80211_get_channel(wiphy, freq);
1370                 if (!chan)
1371                         continue;
1372                 if (n_chan >= channels_max)
1373                         return n_chan;
1374
1375                 channels[n_chan] = chan;
1376                 n_chan++;
1377         }
1378
1379         return n_chan;
1380 }
1381
1382 static unsigned int
1383 ieee80211_ibss_setup_scan_channels(struct wiphy *wiphy,
1384                                    const struct cfg80211_chan_def *chandef,
1385                                    struct ieee80211_channel **channels,
1386                                    unsigned int channels_max)
1387 {
1388         unsigned int n_chan = 0;
1389         u32 width, cf1, cf2 = 0;
1390
1391         switch (chandef->width) {
1392         case NL80211_CHAN_WIDTH_40:
1393                 width = 40;
1394                 break;
1395         case NL80211_CHAN_WIDTH_80P80:
1396                 cf2 = chandef->center_freq2;
1397                 /* fall through */
1398         case NL80211_CHAN_WIDTH_80:
1399                 width = 80;
1400                 break;
1401         case NL80211_CHAN_WIDTH_160:
1402                 width = 160;
1403                 break;
1404         default:
1405                 width = 20;
1406                 break;
1407         }
1408
1409         cf1 = chandef->center_freq1;
1410
1411         n_chan = ibss_setup_channels(wiphy, channels, channels_max, cf1, width);
1412
1413         if (cf2)
1414                 n_chan += ibss_setup_channels(wiphy, &channels[n_chan],
1415                                               channels_max - n_chan, cf2,
1416                                               width);
1417
1418         return n_chan;
1419 }
1420
1421 /*
1422  * This function is called with state == IEEE80211_IBSS_MLME_SEARCH
1423  */
1424
1425 static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
1426 {
1427         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1428         struct ieee80211_local *local = sdata->local;
1429         struct cfg80211_bss *cbss;
1430         struct ieee80211_channel *chan = NULL;
1431         const u8 *bssid = NULL;
1432         enum nl80211_bss_scan_width scan_width;
1433         int active_ibss;
1434
1435         sdata_assert_lock(sdata);
1436
1437         active_ibss = ieee80211_sta_active_ibss(sdata);
1438         ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss);
1439
1440         if (active_ibss)
1441                 return;
1442
1443         if (ifibss->fixed_bssid)
1444                 bssid = ifibss->bssid;
1445         if (ifibss->fixed_channel)
1446                 chan = ifibss->chandef.chan;
1447         if (!is_zero_ether_addr(ifibss->bssid))
1448                 bssid = ifibss->bssid;
1449         cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid,
1450                                 ifibss->ssid, ifibss->ssid_len,
1451                                 IEEE80211_BSS_TYPE_IBSS,
1452                                 IEEE80211_PRIVACY(ifibss->privacy));
1453
1454         if (cbss) {
1455                 struct ieee80211_bss *bss;
1456
1457                 bss = (void *)cbss->priv;
1458                 ibss_dbg(sdata,
1459                          "sta_find_ibss: selected %pM current %pM\n",
1460                          cbss->bssid, ifibss->bssid);
1461                 sdata_info(sdata,
1462                            "Selected IBSS BSSID %pM based on configured SSID\n",
1463                            cbss->bssid);
1464
1465                 ieee80211_sta_join_ibss(sdata, bss);
1466                 ieee80211_rx_bss_put(local, bss);
1467                 return;
1468         }
1469
1470         /* if a fixed bssid and a fixed freq have been provided create the IBSS
1471          * directly and do not waste time scanning
1472          */
1473         if (ifibss->fixed_bssid && ifibss->fixed_channel) {
1474                 sdata_info(sdata, "Created IBSS using preconfigured BSSID %pM\n",
1475                            bssid);
1476                 ieee80211_sta_create_ibss(sdata);
1477                 return;
1478         }
1479
1480
1481         ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n");
1482
1483         /* Selected IBSS not found in current scan results - try to scan */
1484         if (time_after(jiffies, ifibss->last_scan_completed +
1485                                         IEEE80211_SCAN_INTERVAL)) {
1486                 struct ieee80211_channel *channels[8];
1487                 unsigned int num;
1488
1489                 sdata_info(sdata, "Trigger new scan to find an IBSS to join\n");
1490
1491                 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
1492
1493                 if (ifibss->fixed_channel) {
1494                         num = ieee80211_ibss_setup_scan_channels(local->hw.wiphy,
1495                                                                  &ifibss->chandef,
1496                                                                  channels,
1497                                                                  ARRAY_SIZE(channels));
1498                         ieee80211_request_ibss_scan(sdata, ifibss->ssid,
1499                                                     ifibss->ssid_len, channels,
1500                                                     num, scan_width);
1501                 } else {
1502                         ieee80211_request_ibss_scan(sdata, ifibss->ssid,
1503                                                     ifibss->ssid_len, NULL,
1504                                                     0, scan_width);
1505                 }
1506         } else {
1507                 int interval = IEEE80211_SCAN_INTERVAL;
1508
1509                 if (time_after(jiffies, ifibss->ibss_join_req +
1510                                IEEE80211_IBSS_JOIN_TIMEOUT))
1511                         ieee80211_sta_create_ibss(sdata);
1512
1513                 mod_timer(&ifibss->timer,
1514                           round_jiffies(jiffies + interval));
1515         }
1516 }
1517
1518 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
1519                                         struct sk_buff *req)
1520 {
1521         struct ieee80211_mgmt *mgmt = (void *)req->data;
1522         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1523         struct ieee80211_local *local = sdata->local;
1524         int tx_last_beacon, len = req->len;
1525         struct sk_buff *skb;
1526         struct beacon_data *presp;
1527         u8 *pos, *end;
1528
1529         sdata_assert_lock(sdata);
1530
1531         presp = rcu_dereference_protected(ifibss->presp,
1532                                           lockdep_is_held(&sdata->wdev.mtx));
1533
1534         if (ifibss->state != IEEE80211_IBSS_MLME_JOINED ||
1535             len < 24 + 2 || !presp)
1536                 return;
1537
1538         tx_last_beacon = drv_tx_last_beacon(local);
1539
1540         ibss_dbg(sdata,
1541                  "RX ProbeReq SA=%pM DA=%pM BSSID=%pM (tx_last_beacon=%d)\n",
1542                  mgmt->sa, mgmt->da, mgmt->bssid, tx_last_beacon);
1543
1544         if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da))
1545                 return;
1546
1547         if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) &&
1548             !is_broadcast_ether_addr(mgmt->bssid))
1549                 return;
1550
1551         end = ((u8 *) mgmt) + len;
1552         pos = mgmt->u.probe_req.variable;
1553         if (pos[0] != WLAN_EID_SSID ||
1554             pos + 2 + pos[1] > end) {
1555                 ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n",
1556                          mgmt->sa);
1557                 return;
1558         }
1559         if (pos[1] != 0 &&
1560             (pos[1] != ifibss->ssid_len ||
1561              memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) {
1562                 /* Ignore ProbeReq for foreign SSID */
1563                 return;
1564         }
1565
1566         /* Reply with ProbeResp */
1567         skb = dev_alloc_skb(local->tx_headroom + presp->head_len);
1568         if (!skb)
1569                 return;
1570
1571         skb_reserve(skb, local->tx_headroom);
1572         skb_put_data(skb, presp->head, presp->head_len);
1573
1574         memcpy(((struct ieee80211_mgmt *) skb->data)->da, mgmt->sa, ETH_ALEN);
1575         ibss_dbg(sdata, "Sending ProbeResp to %pM\n", mgmt->sa);
1576         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1577
1578         /* avoid excessive retries for probe request to wildcard SSIDs */
1579         if (pos[1] == 0)
1580                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_NO_ACK;
1581
1582         ieee80211_tx_skb(sdata, skb);
1583 }
1584
1585 static
1586 void ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data *sdata,
1587                                     struct ieee80211_mgmt *mgmt, size_t len,
1588                                     struct ieee80211_rx_status *rx_status)
1589 {
1590         size_t baselen;
1591         struct ieee802_11_elems elems;
1592
1593         BUILD_BUG_ON(offsetof(typeof(mgmt->u.probe_resp), variable) !=
1594                      offsetof(typeof(mgmt->u.beacon), variable));
1595
1596         /*
1597          * either beacon or probe_resp but the variable field is at the
1598          * same offset
1599          */
1600         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1601         if (baselen > len)
1602                 return;
1603
1604         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1605                                false, &elems);
1606
1607         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
1608 }
1609
1610 void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1611                                    struct sk_buff *skb)
1612 {
1613         struct ieee80211_rx_status *rx_status;
1614         struct ieee80211_mgmt *mgmt;
1615         u16 fc;
1616         struct ieee802_11_elems elems;
1617         int ies_len;
1618
1619         rx_status = IEEE80211_SKB_RXCB(skb);
1620         mgmt = (struct ieee80211_mgmt *) skb->data;
1621         fc = le16_to_cpu(mgmt->frame_control);
1622
1623         sdata_lock(sdata);
1624
1625         if (!sdata->u.ibss.ssid_len)
1626                 goto mgmt_out; /* not ready to merge yet */
1627
1628         switch (fc & IEEE80211_FCTL_STYPE) {
1629         case IEEE80211_STYPE_PROBE_REQ:
1630                 ieee80211_rx_mgmt_probe_req(sdata, skb);
1631                 break;
1632         case IEEE80211_STYPE_PROBE_RESP:
1633         case IEEE80211_STYPE_BEACON:
1634                 ieee80211_rx_mgmt_probe_beacon(sdata, mgmt, skb->len,
1635                                                rx_status);
1636                 break;
1637         case IEEE80211_STYPE_AUTH:
1638                 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len);
1639                 break;
1640         case IEEE80211_STYPE_DEAUTH:
1641                 ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len);
1642                 break;
1643         case IEEE80211_STYPE_ACTION:
1644                 switch (mgmt->u.action.category) {
1645                 case WLAN_CATEGORY_SPECTRUM_MGMT:
1646                         ies_len = skb->len -
1647                                   offsetof(struct ieee80211_mgmt,
1648                                            u.action.u.chan_switch.variable);
1649
1650                         if (ies_len < 0)
1651                                 break;
1652
1653                         ieee802_11_parse_elems(
1654                                 mgmt->u.action.u.chan_switch.variable,
1655                                 ies_len, true, &elems);
1656
1657                         if (elems.parse_error)
1658                                 break;
1659
1660                         ieee80211_rx_mgmt_spectrum_mgmt(sdata, mgmt, skb->len,
1661                                                         rx_status, &elems);
1662                         break;
1663                 }
1664         }
1665
1666  mgmt_out:
1667         sdata_unlock(sdata);
1668 }
1669
1670 void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata)
1671 {
1672         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1673         struct sta_info *sta;
1674
1675         sdata_lock(sdata);
1676
1677         /*
1678          * Work could be scheduled after scan or similar
1679          * when we aren't even joined (or trying) with a
1680          * network.
1681          */
1682         if (!ifibss->ssid_len)
1683                 goto out;
1684
1685         spin_lock_bh(&ifibss->incomplete_lock);
1686         while (!list_empty(&ifibss->incomplete_stations)) {
1687                 sta = list_first_entry(&ifibss->incomplete_stations,
1688                                        struct sta_info, list);
1689                 list_del(&sta->list);
1690                 spin_unlock_bh(&ifibss->incomplete_lock);
1691
1692                 ieee80211_ibss_finish_sta(sta);
1693                 rcu_read_unlock();
1694                 spin_lock_bh(&ifibss->incomplete_lock);
1695         }
1696         spin_unlock_bh(&ifibss->incomplete_lock);
1697
1698         switch (ifibss->state) {
1699         case IEEE80211_IBSS_MLME_SEARCH:
1700                 ieee80211_sta_find_ibss(sdata);
1701                 break;
1702         case IEEE80211_IBSS_MLME_JOINED:
1703                 ieee80211_sta_merge_ibss(sdata);
1704                 break;
1705         default:
1706                 WARN_ON(1);
1707                 break;
1708         }
1709
1710  out:
1711         sdata_unlock(sdata);
1712 }
1713
1714 static void ieee80211_ibss_timer(unsigned long data)
1715 {
1716         struct ieee80211_sub_if_data *sdata =
1717                 (struct ieee80211_sub_if_data *) data;
1718
1719         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1720 }
1721
1722 void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata)
1723 {
1724         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1725
1726         setup_timer(&ifibss->timer, ieee80211_ibss_timer,
1727                     (unsigned long) sdata);
1728         INIT_LIST_HEAD(&ifibss->incomplete_stations);
1729         spin_lock_init(&ifibss->incomplete_lock);
1730         INIT_WORK(&ifibss->csa_connection_drop_work,
1731                   ieee80211_csa_connection_drop_work);
1732 }
1733
1734 /* scan finished notification */
1735 void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local)
1736 {
1737         struct ieee80211_sub_if_data *sdata;
1738
1739         mutex_lock(&local->iflist_mtx);
1740         list_for_each_entry(sdata, &local->interfaces, list) {
1741                 if (!ieee80211_sdata_running(sdata))
1742                         continue;
1743                 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
1744                         continue;
1745                 sdata->u.ibss.last_scan_completed = jiffies;
1746         }
1747         mutex_unlock(&local->iflist_mtx);
1748 }
1749
1750 int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
1751                         struct cfg80211_ibss_params *params)
1752 {
1753         u32 changed = 0;
1754         u32 rate_flags;
1755         struct ieee80211_supported_band *sband;
1756         enum ieee80211_chanctx_mode chanmode;
1757         struct ieee80211_local *local = sdata->local;
1758         int radar_detect_width = 0;
1759         int i;
1760         int ret;
1761
1762         ret = cfg80211_chandef_dfs_required(local->hw.wiphy,
1763                                             &params->chandef,
1764                                             sdata->wdev.iftype);
1765         if (ret < 0)
1766                 return ret;
1767
1768         if (ret > 0) {
1769                 if (!params->userspace_handles_dfs)
1770                         return -EINVAL;
1771                 radar_detect_width = BIT(params->chandef.width);
1772         }
1773
1774         chanmode = (params->channel_fixed && !ret) ?
1775                 IEEE80211_CHANCTX_SHARED : IEEE80211_CHANCTX_EXCLUSIVE;
1776
1777         mutex_lock(&local->chanctx_mtx);
1778         ret = ieee80211_check_combinations(sdata, &params->chandef, chanmode,
1779                                            radar_detect_width);
1780         mutex_unlock(&local->chanctx_mtx);
1781         if (ret < 0)
1782                 return ret;
1783
1784         if (params->bssid) {
1785                 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN);
1786                 sdata->u.ibss.fixed_bssid = true;
1787         } else
1788                 sdata->u.ibss.fixed_bssid = false;
1789
1790         sdata->u.ibss.privacy = params->privacy;
1791         sdata->u.ibss.control_port = params->control_port;
1792         sdata->u.ibss.userspace_handles_dfs = params->userspace_handles_dfs;
1793         sdata->u.ibss.basic_rates = params->basic_rates;
1794         sdata->u.ibss.last_scan_completed = jiffies;
1795
1796         /* fix basic_rates if channel does not support these rates */
1797         rate_flags = ieee80211_chandef_rate_flags(&params->chandef);
1798         sband = local->hw.wiphy->bands[params->chandef.chan->band];
1799         for (i = 0; i < sband->n_bitrates; i++) {
1800                 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
1801                         sdata->u.ibss.basic_rates &= ~BIT(i);
1802         }
1803         memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate,
1804                sizeof(params->mcast_rate));
1805
1806         sdata->vif.bss_conf.beacon_int = params->beacon_interval;
1807
1808         sdata->u.ibss.chandef = params->chandef;
1809         sdata->u.ibss.fixed_channel = params->channel_fixed;
1810
1811         if (params->ie) {
1812                 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len,
1813                                            GFP_KERNEL);
1814                 if (sdata->u.ibss.ie)
1815                         sdata->u.ibss.ie_len = params->ie_len;
1816         }
1817
1818         sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
1819         sdata->u.ibss.ibss_join_req = jiffies;
1820
1821         memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len);
1822         sdata->u.ibss.ssid_len = params->ssid_len;
1823
1824         memcpy(&sdata->u.ibss.ht_capa, &params->ht_capa,
1825                sizeof(sdata->u.ibss.ht_capa));
1826         memcpy(&sdata->u.ibss.ht_capa_mask, &params->ht_capa_mask,
1827                sizeof(sdata->u.ibss.ht_capa_mask));
1828
1829         /*
1830          * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is
1831          * reserved, but an HT STA shall protect HT transmissions as though
1832          * the HT Protection field were set to non-HT mixed mode.
1833          *
1834          * In an IBSS, the RIFS Mode field of the HT Operation element is
1835          * also reserved, but an HT STA shall operate as though this field
1836          * were set to 1.
1837          */
1838
1839         sdata->vif.bss_conf.ht_operation_mode |=
1840                   IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED
1841                 | IEEE80211_HT_PARAM_RIFS_MODE;
1842
1843         changed |= BSS_CHANGED_HT;
1844         ieee80211_bss_info_change_notify(sdata, changed);
1845
1846         sdata->smps_mode = IEEE80211_SMPS_OFF;
1847         sdata->needed_rx_chains = local->rx_chains;
1848
1849         ieee80211_queue_work(&local->hw, &sdata->work);
1850
1851         return 0;
1852 }
1853
1854 int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata)
1855 {
1856         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1857
1858         ieee80211_ibss_disconnect(sdata);
1859         ifibss->ssid_len = 0;
1860         eth_zero_addr(ifibss->bssid);
1861
1862         /* remove beacon */
1863         kfree(sdata->u.ibss.ie);
1864
1865         /* on the next join, re-program HT parameters */
1866         memset(&ifibss->ht_capa, 0, sizeof(ifibss->ht_capa));
1867         memset(&ifibss->ht_capa_mask, 0, sizeof(ifibss->ht_capa_mask));
1868
1869         synchronize_rcu();
1870
1871         skb_queue_purge(&sdata->skb_queue);
1872
1873         del_timer_sync(&sdata->u.ibss.timer);
1874
1875         return 0;
1876 }