net/mac80211/ibss.c

   1 /*
   2  * IBSS mode implementation
   3  * Copyright 2003-2008, Jouni Malinen <[email protected]>
   4  * Copyright 2004, Instant802 Networks, Inc.
   5  * Copyright 2005, Devicescape Software, Inc.
   6  * Copyright 2006-2007  Jiri Benc <[email protected]>
   7  * Copyright 2007, Michael Wu <[email protected]>
   8  * Copyright 2009, Johannes Berg <[email protected]>
   9  * Copyright 2013-2014  Intel Mobile Communications GmbH
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License version 2 as
  13  * published by the Free Software Foundation.
  14  */
  15
  16 #include <linux/delay.h>
  17 #include <linux/slab.h>
  18 #include <linux/if_ether.h>
  19 #include <linux/skbuff.h>
  20 #include <linux/if_arp.h>
  21 #include <linux/etherdevice.h>
  22 #include <linux/rtnetlink.h>
  23 #include <net/mac80211.h>
  24
  25 #include "ieee80211_i.h"
  26 #include "driver-ops.h"
  27 #include "rate.h"
  28
  29 #define IEEE80211_SCAN_INTERVAL (2 * HZ)
  30 #define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ)
  31
  32 #define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ)
  33 #define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ)
  34 #define IEEE80211_IBSS_RSN_INACTIVITY_LIMIT (10 * HZ)
  35
  36 #define IEEE80211_IBSS_MAX_STA_ENTRIES 128
  37
  38 static struct beacon_data *
  39 ieee80211_ibss_build_presp(struct ieee80211_sub_if_data *sdata,
  40                            const int beacon_int, const u32 basic_rates,
  41                            const u16 capability, u64 tsf,
  42                            struct cfg80211_chan_def *chandef,
  43                            bool *have_higher_than_11mbit,
  44                            struct cfg80211_csa_settings *csa_settings)
  45 {
  46         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
  47         struct ieee80211_local *local = sdata->local;
  48         int rates_n = 0, i, ri;
  49         struct ieee80211_mgmt *mgmt;
  50         u8 *pos;
  51         struct ieee80211_supported_band *sband;
  52         u32 rate_flags, rates = 0, rates_added = 0;
  53         struct beacon_data *presp;
  54         int frame_len;
  55         int shift;
  56
  57         /* Build IBSS probe response */
  58         frame_len = sizeof(struct ieee80211_hdr_3addr) +
  59                     12 /* struct ieee80211_mgmt.u.beacon */ +
  60                     2 + IEEE80211_MAX_SSID_LEN /* max SSID */ +
  61                     2 + 8 /* max Supported Rates */ +
  62                     3 /* max DS params */ +
  63                     4 /* IBSS params */ +
  64                     5 /* Channel Switch Announcement */ +
  65                     2 + (IEEE80211_MAX_SUPP_RATES - 8) +
  66                     2 + sizeof(struct ieee80211_ht_cap) +
  67                     2 + sizeof(struct ieee80211_ht_operation) +
  68                     ifibss->ie_len;
  69         presp = kzalloc(sizeof(*presp) + frame_len, GFP_KERNEL);
  70         if (!presp)
  71                 return NULL;
  72
  73         presp->head = (void *)(presp + 1);
  74
  75         mgmt = (void *) presp->head;
  76         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
  77                                           IEEE80211_STYPE_PROBE_RESP);
  78         eth_broadcast_addr(mgmt->da);
  79         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
  80         memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN);
  81         mgmt->u.beacon.beacon_int = cpu_to_le16(beacon_int);
  82         mgmt->u.beacon.timestamp = cpu_to_le64(tsf);
  83         mgmt->u.beacon.capab_info = cpu_to_le16(capability);
  84
  85         pos = (u8 *)mgmt + offsetof(struct ieee80211_mgmt, u.beacon.variable);
  86
  87         *pos++ = WLAN_EID_SSID;
  88         *pos++ = ifibss->ssid_len;
  89         memcpy(pos, ifibss->ssid, ifibss->ssid_len);
  90         pos += ifibss->ssid_len;
  91
  92         sband = local->hw.wiphy->bands[chandef->chan->band];
  93         rate_flags = ieee80211_chandef_rate_flags(chandef);
  94         shift = ieee80211_chandef_get_shift(chandef);
  95         rates_n = 0;
  96         if (have_higher_than_11mbit)
  97                 *have_higher_than_11mbit = false;
  98
  99         for (i = 0; i < sband->n_bitrates; i++) {
 100                 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
 101                         continue;
 102                 if (sband->bitrates[i].bitrate > 110 &&
 103                     have_higher_than_11mbit)
 104                         *have_higher_than_11mbit = true;
 105
 106                 rates |= BIT(i);
 107                 rates_n++;
 108         }
 109
 110         *pos++ = WLAN_EID_SUPP_RATES;
 111         *pos++ = min_t(int, 8, rates_n);
 112         for (ri = 0; ri < sband->n_bitrates; ri++) {
 113                 int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate,
 114                                         5 * (1 << shift));
 115                 u8 basic = 0;
 116                 if (!(rates & BIT(ri)))
 117                         continue;
 118
 119                 if (basic_rates & BIT(ri))
 120                         basic = 0x80;
 121                 *pos++ = basic | (u8) rate;
 122                 if (++rates_added == 8) {
 123                         ri++; /* continue at next rate for EXT_SUPP_RATES */
 124                         break;
 125                 }
 126         }
 127
 128         if (sband->band == IEEE80211_BAND_2GHZ) {
 129                 *pos++ = WLAN_EID_DS_PARAMS;
 130                 *pos++ = 1;
 131                 *pos++ = ieee80211_frequency_to_channel(
 132                                 chandef->chan->center_freq);
 133         }
 134
 135         *pos++ = WLAN_EID_IBSS_PARAMS;
 136         *pos++ = 2;
 137         /* FIX: set ATIM window based on scan results */
 138         *pos++ = 0;
 139         *pos++ = 0;
 140
 141         if (csa_settings) {
 142                 *pos++ = WLAN_EID_CHANNEL_SWITCH;
 143                 *pos++ = 3;
 144                 *pos++ = csa_settings->block_tx ? 1 : 0;
 145                 *pos++ = ieee80211_frequency_to_channel(
 146                                 csa_settings->chandef.chan->center_freq);
 147                 presp->csa_counter_offsets[0] = (pos - presp->head);
 148                 *pos++ = csa_settings->count;
 149                 presp->csa_current_counter = csa_settings->count;
 150         }
 151
 152         /* put the remaining rates in WLAN_EID_EXT_SUPP_RATES */
 153         if (rates_n > 8) {
 154                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 155                 *pos++ = rates_n - 8;
 156                 for (; ri < sband->n_bitrates; ri++) {
 157                         int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate,
 158                                                 5 * (1 << shift));
 159                         u8 basic = 0;
 160                         if (!(rates & BIT(ri)))
 161                                 continue;
 162
 163                         if (basic_rates & BIT(ri))
 164                                 basic = 0x80;
 165                         *pos++ = basic | (u8) rate;
 166                 }
 167         }
 168
 169         if (ifibss->ie_len) {
 170                 memcpy(pos, ifibss->ie, ifibss->ie_len);
 171                 pos += ifibss->ie_len;
 172         }
 173
 174         /* add HT capability and information IEs */
 175         if (chandef->width != NL80211_CHAN_WIDTH_20_NOHT &&
 176             chandef->width != NL80211_CHAN_WIDTH_5 &&
 177             chandef->width != NL80211_CHAN_WIDTH_10 &&
 178             sband->ht_cap.ht_supported) {
 179                 struct ieee80211_sta_ht_cap ht_cap;
 180
 181                 memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
 182                 ieee80211_apply_htcap_overrides(sdata, &ht_cap);
 183
 184                 pos = ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap);
 185                 /*
 186                  * Note: According to 802.11n-2009 9.13.3.1, HT Protection
 187                  * field and RIFS Mode are reserved in IBSS mode, therefore
 188                  * keep them at 0
 189                  */
 190                 pos = ieee80211_ie_build_ht_oper(pos, &sband->ht_cap,
 191                                                  chandef, 0, false);
 192
 193                 /* add VHT capability and information IEs */
 194                 if (chandef->width != NL80211_CHAN_WIDTH_20 &&
 195                     chandef->width != NL80211_CHAN_WIDTH_40 &&
 196                     sband->vht_cap.vht_supported) {
 197                         pos = ieee80211_ie_build_vht_cap(pos, &sband->vht_cap,
 198                                                          sband->vht_cap.cap);
 199                         pos = ieee80211_ie_build_vht_oper(pos, &sband->vht_cap,
 200                                                           chandef);
 201                 }
 202         }
 203
 204         if (local->hw.queues >= IEEE80211_NUM_ACS)
 205                 pos = ieee80211_add_wmm_info_ie(pos, 0); /* U-APSD not in use */
 206
 207         presp->head_len = pos - presp->head;
 208         if (WARN_ON(presp->head_len > frame_len))
 209                 goto error;
 210
 211         return presp;
 212 error:
 213         kfree(presp);
 214         return NULL;
 215 }
 216
 217 static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
 218                                       const u8 *bssid, const int beacon_int,
 219                                       struct cfg80211_chan_def *req_chandef,
 220                                       const u32 basic_rates,
 221                                       const u16 capability, u64 tsf,
 222                                       bool creator)
 223 {
 224         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 225         struct ieee80211_local *local = sdata->local;
 226         struct ieee80211_mgmt *mgmt;
 227         struct cfg80211_bss *bss;
 228         u32 bss_change;
 229         struct cfg80211_chan_def chandef;
 230         struct ieee80211_channel *chan;
 231         struct beacon_data *presp;
 232         struct cfg80211_inform_bss bss_meta = {};
 233         bool have_higher_than_11mbit;
 234         bool radar_required;
 235         int err;
 236
 237         sdata_assert_lock(sdata);
 238
 239         /* Reset own TSF to allow time synchronization work. */
 240         drv_reset_tsf(local, sdata);
 241
 242         if (!ether_addr_equal(ifibss->bssid, bssid))
 243                 sta_info_flush(sdata);
 244
 245         /* if merging, indicate to driver that we leave the old IBSS */
 246         if (sdata->vif.bss_conf.ibss_joined) {
 247                 sdata->vif.bss_conf.ibss_joined = false;
 248                 sdata->vif.bss_conf.ibss_creator = false;
 249                 sdata->vif.bss_conf.enable_beacon = false;
 250                 netif_carrier_off(sdata->dev);
 251                 ieee80211_bss_info_change_notify(sdata,
 252                                                  BSS_CHANGED_IBSS |
 253                                                  BSS_CHANGED_BEACON_ENABLED);
 254                 drv_leave_ibss(local, sdata);
 255         }
 256
 257         presp = rcu_dereference_protected(ifibss->presp,
 258                                           lockdep_is_held(&sdata->wdev.mtx));
 259         RCU_INIT_POINTER(ifibss->presp, NULL);
 260         if (presp)
 261                 kfree_rcu(presp, rcu_head);
 262
 263         /* make a copy of the chandef, it could be modified below. */
 264         chandef = *req_chandef;
 265         chan = chandef.chan;
 266         if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef,
 267                                      NL80211_IFTYPE_ADHOC)) {
 268                 if (chandef.width == NL80211_CHAN_WIDTH_5 ||
 269                     chandef.width == NL80211_CHAN_WIDTH_10 ||
 270                     chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
 271                     chandef.width == NL80211_CHAN_WIDTH_20) {
 272                         sdata_info(sdata,
 273                                    "Failed to join IBSS, beacons forbidden\n");
 274                         return;
 275                 }
 276                 chandef.width = NL80211_CHAN_WIDTH_20;
 277                 chandef.center_freq1 = chan->center_freq;
 278                 /* check again for downgraded chandef */
 279                 if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef,
 280                                              NL80211_IFTYPE_ADHOC)) {
 281                         sdata_info(sdata,
 282                                    "Failed to join IBSS, beacons forbidden\n");
 283                         return;
 284                 }
 285         }
 286
 287         err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
 288                                             &chandef, NL80211_IFTYPE_ADHOC);
 289         if (err < 0) {
 290                 sdata_info(sdata,
 291                            "Failed to join IBSS, invalid chandef\n");
 292                 return;
 293         }
 294         if (err > 0 && !ifibss->userspace_handles_dfs) {
 295                 sdata_info(sdata,
 296                            "Failed to join IBSS, DFS channel without control program\n");
 297                 return;
 298         }
 299
 300         radar_required = err;
 301
 302         mutex_lock(&local->mtx);
 303         if (ieee80211_vif_use_channel(sdata, &chandef,
 304                                       ifibss->fixed_channel ?
 305                                         IEEE80211_CHANCTX_SHARED :
 306                                         IEEE80211_CHANCTX_EXCLUSIVE)) {
 307                 sdata_info(sdata, "Failed to join IBSS, no channel context\n");
 308                 mutex_unlock(&local->mtx);
 309                 return;
 310         }
 311         sdata->radar_required = radar_required;
 312         mutex_unlock(&local->mtx);
 313
 314         memcpy(ifibss->bssid, bssid, ETH_ALEN);
 315
 316         presp = ieee80211_ibss_build_presp(sdata, beacon_int, basic_rates,
 317                                            capability, tsf, &chandef,
 318                                            &have_higher_than_11mbit, NULL);
 319         if (!presp)
 320                 return;
 321
 322         rcu_assign_pointer(ifibss->presp, presp);
 323         mgmt = (void *)presp->head;
 324
 325         sdata->vif.bss_conf.enable_beacon = true;
 326         sdata->vif.bss_conf.beacon_int = beacon_int;
 327         sdata->vif.bss_conf.basic_rates = basic_rates;
 328         sdata->vif.bss_conf.ssid_len = ifibss->ssid_len;
 329         memcpy(sdata->vif.bss_conf.ssid, ifibss->ssid, ifibss->ssid_len);
 330         bss_change = BSS_CHANGED_BEACON_INT;
 331         bss_change |= ieee80211_reset_erp_info(sdata);
 332         bss_change |= BSS_CHANGED_BSSID;
 333         bss_change |= BSS_CHANGED_BEACON;
 334         bss_change |= BSS_CHANGED_BEACON_ENABLED;
 335         bss_change |= BSS_CHANGED_BASIC_RATES;
 336         bss_change |= BSS_CHANGED_HT;
 337         bss_change |= BSS_CHANGED_IBSS;
 338         bss_change |= BSS_CHANGED_SSID;
 339
 340         /*
 341          * In 5 GHz/802.11a, we can always use short slot time.
 342          * (IEEE 802.11-2012 18.3.8.7)
 343          *
 344          * In 2.4GHz, we must always use long slots in IBSS for compatibility
 345          * reasons.
 346          * (IEEE 802.11-2012 19.4.5)
 347          *
 348          * HT follows these specifications (IEEE 802.11-2012 20.3.18)
 349          */
 350         sdata->vif.bss_conf.use_short_slot = chan->band == IEEE80211_BAND_5GHZ;
 351         bss_change |= BSS_CHANGED_ERP_SLOT;
 352
 353         /* cf. IEEE 802.11 9.2.12 */
 354         if (chan->band == IEEE80211_BAND_2GHZ && have_higher_than_11mbit)
 355                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
 356         else
 357                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
 358
 359         ieee80211_set_wmm_default(sdata, true, false);
 360
 361         sdata->vif.bss_conf.ibss_joined = true;
 362         sdata->vif.bss_conf.ibss_creator = creator;
 363
 364         err = drv_join_ibss(local, sdata);
 365         if (err) {
 366                 sdata->vif.bss_conf.ibss_joined = false;
 367                 sdata->vif.bss_conf.ibss_creator = false;
 368                 sdata->vif.bss_conf.enable_beacon = false;
 369                 sdata->vif.bss_conf.ssid_len = 0;
 370                 RCU_INIT_POINTER(ifibss->presp, NULL);
 371                 kfree_rcu(presp, rcu_head);
 372                 mutex_lock(&local->mtx);
 373                 ieee80211_vif_release_channel(sdata);
 374                 mutex_unlock(&local->mtx);
 375                 sdata_info(sdata, "Failed to join IBSS, driver failure: %d\n",
 376                            err);
 377                 return;
 378         }
 379
 380         ieee80211_bss_info_change_notify(sdata, bss_change);
 381
 382         ifibss->state = IEEE80211_IBSS_MLME_JOINED;
 383         mod_timer(&ifibss->timer,
 384                   round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
 385
 386         bss_meta.chan = chan;
 387         bss_meta.scan_width = cfg80211_chandef_to_scan_width(&chandef);
 388         bss = cfg80211_inform_bss_frame_data(local->hw.wiphy, &bss_meta, mgmt,
 389                                              presp->head_len, GFP_KERNEL);
 390
 391         cfg80211_put_bss(local->hw.wiphy, bss);
 392         netif_carrier_on(sdata->dev);
 393         cfg80211_ibss_joined(sdata->dev, ifibss->bssid, chan, GFP_KERNEL);
 394 }
 395
 396 static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
 397                                     struct ieee80211_bss *bss)
 398 {
 399         struct cfg80211_bss *cbss =
 400                 container_of((void *)bss, struct cfg80211_bss, priv);
 401         struct ieee80211_supported_band *sband;
 402         struct cfg80211_chan_def chandef;
 403         u32 basic_rates;
 404         int i, j;
 405         u16 beacon_int = cbss->beacon_interval;
 406         const struct cfg80211_bss_ies *ies;
 407         enum nl80211_channel_type chan_type;
 408         u64 tsf;
 409         u32 rate_flags;
 410         int shift;
 411
 412         sdata_assert_lock(sdata);
 413
 414         if (beacon_int < 10)
 415                 beacon_int = 10;
 416
 417         switch (sdata->u.ibss.chandef.width) {
 418         case NL80211_CHAN_WIDTH_20_NOHT:
 419         case NL80211_CHAN_WIDTH_20:
 420         case NL80211_CHAN_WIDTH_40:
 421                 chan_type = cfg80211_get_chandef_type(&sdata->u.ibss.chandef);
 422                 cfg80211_chandef_create(&chandef, cbss->channel, chan_type);
 423                 break;
 424         case NL80211_CHAN_WIDTH_5:
 425         case NL80211_CHAN_WIDTH_10:
 426                 cfg80211_chandef_create(&chandef, cbss->channel,
 427                                         NL80211_CHAN_WIDTH_20_NOHT);
 428                 chandef.width = sdata->u.ibss.chandef.width;
 429                 break;
 430         case NL80211_CHAN_WIDTH_80:
 431         case NL80211_CHAN_WIDTH_80P80:
 432         case NL80211_CHAN_WIDTH_160:
 433                 chandef = sdata->u.ibss.chandef;
 434                 chandef.chan = cbss->channel;
 435                 break;
 436         default:
 437                 /* fall back to 20 MHz for unsupported modes */
 438                 cfg80211_chandef_create(&chandef, cbss->channel,
 439                                         NL80211_CHAN_WIDTH_20_NOHT);
 440                 break;
 441         }
 442
 443         sband = sdata->local->hw.wiphy->bands[cbss->channel->band];
 444         rate_flags = ieee80211_chandef_rate_flags(&sdata->u.ibss.chandef);
 445         shift = ieee80211_vif_get_shift(&sdata->vif);
 446
 447         basic_rates = 0;
 448
 449         for (i = 0; i < bss->supp_rates_len; i++) {
 450                 int rate = bss->supp_rates[i] & 0x7f;
 451                 bool is_basic = !!(bss->supp_rates[i] & 0x80);
 452
 453                 for (j = 0; j < sband->n_bitrates; j++) {
 454                         int brate;
 455                         if ((rate_flags & sband->bitrates[j].flags)
 456                             != rate_flags)
 457                                 continue;
 458
 459                         brate = DIV_ROUND_UP(sband->bitrates[j].bitrate,
 460                                              5 * (1 << shift));
 461                         if (brate == rate) {
 462                                 if (is_basic)
 463                                         basic_rates |= BIT(j);
 464                                 break;
 465                         }
 466                 }
 467         }
 468
 469         rcu_read_lock();
 470         ies = rcu_dereference(cbss->ies);
 471         tsf = ies->tsf;
 472         rcu_read_unlock();
 473
 474         __ieee80211_sta_join_ibss(sdata, cbss->bssid,
 475                                   beacon_int,
 476                                   &chandef,
 477                                   basic_rates,
 478                                   cbss->capability,
 479                                   tsf, false);
 480 }
 481
 482 int ieee80211_ibss_csa_beacon(struct ieee80211_sub_if_data *sdata,
 483                               struct cfg80211_csa_settings *csa_settings)
 484 {
 485         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 486         struct beacon_data *presp, *old_presp;
 487         struct cfg80211_bss *cbss;
 488         const struct cfg80211_bss_ies *ies;
 489         u16 capability = 0;
 490         u64 tsf;
 491         int ret = 0;
 492
 493         sdata_assert_lock(sdata);
 494
 495         if (ifibss->privacy)
 496                 capability = WLAN_CAPABILITY_PRIVACY;
 497
 498         cbss = cfg80211_get_bss(sdata->local->hw.wiphy, ifibss->chandef.chan,
 499                                 ifibss->bssid, ifibss->ssid,
 500                                 ifibss->ssid_len, IEEE80211_BSS_TYPE_IBSS,
 501                                 IEEE80211_PRIVACY(ifibss->privacy));
 502
 503         if (WARN_ON(!cbss)) {
 504                 ret = -EINVAL;
 505                 goto out;
 506         }
 507
 508         rcu_read_lock();
 509         ies = rcu_dereference(cbss->ies);
 510         tsf = ies->tsf;
 511         rcu_read_unlock();
 512         cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
 513
 514         old_presp = rcu_dereference_protected(ifibss->presp,
 515                                           lockdep_is_held(&sdata->wdev.mtx));
 516
 517         presp = ieee80211_ibss_build_presp(sdata,
 518                                            sdata->vif.bss_conf.beacon_int,
 519                                            sdata->vif.bss_conf.basic_rates,
 520                                            capability, tsf, &ifibss->chandef,
 521                                            NULL, csa_settings);
 522         if (!presp) {
 523                 ret = -ENOMEM;
 524                 goto out;
 525         }
 526
 527         rcu_assign_pointer(ifibss->presp, presp);
 528         if (old_presp)
 529                 kfree_rcu(old_presp, rcu_head);
 530
 531         return BSS_CHANGED_BEACON;
 532  out:
 533         return ret;
 534 }
 535
 536 int ieee80211_ibss_finish_csa(struct ieee80211_sub_if_data *sdata)
 537 {
 538         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 539         struct cfg80211_bss *cbss;
 540         int err, changed = 0;
 541
 542         sdata_assert_lock(sdata);
 543
 544         /* update cfg80211 bss information with the new channel */
 545         if (!is_zero_ether_addr(ifibss->bssid)) {
 546                 cbss = cfg80211_get_bss(sdata->local->hw.wiphy,
 547                                         ifibss->chandef.chan,
 548                                         ifibss->bssid, ifibss->ssid,
 549                                         ifibss->ssid_len,
 550                                         IEEE80211_BSS_TYPE_IBSS,
 551                                         IEEE80211_PRIVACY(ifibss->privacy));
 552                 /* XXX: should not really modify cfg80211 data */
 553                 if (cbss) {
 554                         cbss->channel = sdata->csa_chandef.chan;
 555                         cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
 556                 }
 557         }
 558
 559         ifibss->chandef = sdata->csa_chandef;
 560
 561         /* generate the beacon */
 562         err = ieee80211_ibss_csa_beacon(sdata, NULL);
 563         if (err < 0)
 564                 return err;
 565
 566         changed |= err;
 567
 568         return changed;
 569 }
 570
 571 void ieee80211_ibss_stop(struct ieee80211_sub_if_data *sdata)
 572 {
 573         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 574
 575         cancel_work_sync(&ifibss->csa_connection_drop_work);
 576 }
 577
 578 static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta)
 579         __acquires(RCU)
 580 {
 581         struct ieee80211_sub_if_data *sdata = sta->sdata;
 582         u8 addr[ETH_ALEN];
 583
 584         memcpy(addr, sta->sta.addr, ETH_ALEN);
 585
 586         ibss_dbg(sdata, "Adding new IBSS station %pM\n", addr);
 587
 588         sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
 589         sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
 590         /* authorize the station only if the network is not RSN protected. If
 591          * not wait for the userspace to authorize it */
 592         if (!sta->sdata->u.ibss.control_port)
 593                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
 594
 595         rate_control_rate_init(sta);
 596
 597         /* If it fails, maybe we raced another insertion? */
 598         if (sta_info_insert_rcu(sta))
 599                 return sta_info_get(sdata, addr);
 600         return sta;
 601 }
 602
 603 static struct sta_info *
 604 ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, const u8 *bssid,
 605                        const u8 *addr, u32 supp_rates)
 606         __acquires(RCU)
 607 {
 608         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 609         struct ieee80211_local *local = sdata->local;
 610         struct sta_info *sta;
 611         struct ieee80211_chanctx_conf *chanctx_conf;
 612         struct ieee80211_supported_band *sband;
 613         enum nl80211_bss_scan_width scan_width;
 614         int band;
 615
 616         /*
 617          * XXX: Consider removing the least recently used entry and
 618          *      allow new one to be added.
 619          */
 620         if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
 621                 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
 622                                     sdata->name, addr);
 623                 rcu_read_lock();
 624                 return NULL;
 625         }
 626
 627         if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) {
 628                 rcu_read_lock();
 629                 return NULL;
 630         }
 631
 632         if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) {
 633                 rcu_read_lock();
 634                 return NULL;
 635         }
 636
 637         rcu_read_lock();
 638         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 639         if (WARN_ON_ONCE(!chanctx_conf))
 640                 return NULL;
 641         band = chanctx_conf->def.chan->band;
 642         scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
 643         rcu_read_unlock();
 644
 645         sta = sta_info_alloc(sdata, addr, GFP_KERNEL);
 646         if (!sta) {
 647                 rcu_read_lock();
 648                 return NULL;
 649         }
 650
 651         sta->rx_stats.last_rx = jiffies;
 652
 653         /* make sure mandatory rates are always added */
 654         sband = local->hw.wiphy->bands[band];
 655         sta->sta.supp_rates[band] = supp_rates |
 656                         ieee80211_mandatory_rates(sband, scan_width);
 657
 658         return ieee80211_ibss_finish_sta(sta);
 659 }
 660
 661 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
 662 {
 663         struct ieee80211_local *local = sdata->local;
 664         int active = 0;
 665         struct sta_info *sta;
 666
 667         sdata_assert_lock(sdata);
 668
 669         rcu_read_lock();
 670
 671         list_for_each_entry_rcu(sta, &local->sta_list, list) {
 672                 if (sta->sdata == sdata &&
 673                     time_after(sta->rx_stats.last_rx +
 674                                IEEE80211_IBSS_MERGE_INTERVAL,
 675                                jiffies)) {
 676                         active++;
 677                         break;
 678                 }
 679         }
 680
 681         rcu_read_unlock();
 682
 683         return active;
 684 }
 685
 686 static void ieee80211_ibss_disconnect(struct ieee80211_sub_if_data *sdata)
 687 {
 688         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 689         struct ieee80211_local *local = sdata->local;
 690         struct cfg80211_bss *cbss;
 691         struct beacon_data *presp;
 692         struct sta_info *sta;
 693
 694         if (!is_zero_ether_addr(ifibss->bssid)) {
 695                 cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->chandef.chan,
 696                                         ifibss->bssid, ifibss->ssid,
 697                                         ifibss->ssid_len,
 698                                         IEEE80211_BSS_TYPE_IBSS,
 699                                         IEEE80211_PRIVACY(ifibss->privacy));
 700
 701                 if (cbss) {
 702                         cfg80211_unlink_bss(local->hw.wiphy, cbss);
 703                         cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
 704                 }
 705         }
 706
 707         ifibss->state = IEEE80211_IBSS_MLME_SEARCH;
 708
 709         sta_info_flush(sdata);
 710
 711         spin_lock_bh(&ifibss->incomplete_lock);
 712         while (!list_empty(&ifibss->incomplete_stations)) {
 713                 sta = list_first_entry(&ifibss->incomplete_stations,
 714                                        struct sta_info, list);
 715                 list_del(&sta->list);
 716                 spin_unlock_bh(&ifibss->incomplete_lock);
 717
 718                 sta_info_free(local, sta);
 719                 spin_lock_bh(&ifibss->incomplete_lock);
 720         }
 721         spin_unlock_bh(&ifibss->incomplete_lock);
 722
 723         netif_carrier_off(sdata->dev);
 724
 725         sdata->vif.bss_conf.ibss_joined = false;
 726         sdata->vif.bss_conf.ibss_creator = false;
 727         sdata->vif.bss_conf.enable_beacon = false;
 728         sdata->vif.bss_conf.ssid_len = 0;
 729
 730         /* remove beacon */
 731         presp = rcu_dereference_protected(ifibss->presp,
 732                                           lockdep_is_held(&sdata->wdev.mtx));
 733         RCU_INIT_POINTER(sdata->u.ibss.presp, NULL);
 734         if (presp)
 735                 kfree_rcu(presp, rcu_head);
 736
 737         clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state);
 738         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED |
 739                                                 BSS_CHANGED_IBSS);
 740         drv_leave_ibss(local, sdata);
 741         mutex_lock(&local->mtx);
 742         ieee80211_vif_release_channel(sdata);
 743         mutex_unlock(&local->mtx);
 744 }
 745
 746 static void ieee80211_csa_connection_drop_work(struct work_struct *work)
 747 {
 748         struct ieee80211_sub_if_data *sdata =
 749                 container_of(work, struct ieee80211_sub_if_data,
 750                              u.ibss.csa_connection_drop_work);
 751
 752         sdata_lock(sdata);
 753
 754         ieee80211_ibss_disconnect(sdata);
 755         synchronize_rcu();
 756         skb_queue_purge(&sdata->skb_queue);
 757
 758         /* trigger a scan to find another IBSS network to join */
 759         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
 760
 761         sdata_unlock(sdata);
 762 }
 763
 764 static void ieee80211_ibss_csa_mark_radar(struct ieee80211_sub_if_data *sdata)
 765 {
 766         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 767         int err;
 768
 769         /* if the current channel is a DFS channel, mark the channel as
 770          * unavailable.
 771          */
 772         err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
 773                                             &ifibss->chandef,
 774                                             NL80211_IFTYPE_ADHOC);
 775         if (err > 0)
 776                 cfg80211_radar_event(sdata->local->hw.wiphy, &ifibss->chandef,
 777                                      GFP_ATOMIC);
 778 }
 779
 780 static bool
 781 ieee80211_ibss_process_chanswitch(struct ieee80211_sub_if_data *sdata,
 782                                   struct ieee802_11_elems *elems,
 783                                   bool beacon)
 784 {
 785         struct cfg80211_csa_settings params;
 786         struct ieee80211_csa_ie csa_ie;
 787         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 788         enum nl80211_channel_type ch_type;
 789         int err;
 790         u32 sta_flags;
 791
 792         sdata_assert_lock(sdata);
 793
 794         sta_flags = IEEE80211_STA_DISABLE_VHT;
 795         switch (ifibss->chandef.width) {
 796         case NL80211_CHAN_WIDTH_5:
 797         case NL80211_CHAN_WIDTH_10:
 798         case NL80211_CHAN_WIDTH_20_NOHT:
 799                 sta_flags |= IEEE80211_STA_DISABLE_HT;
 800                 /* fall through */
 801         case NL80211_CHAN_WIDTH_20:
 802                 sta_flags |= IEEE80211_STA_DISABLE_40MHZ;
 803                 break;
 804         default:
 805                 break;
 806         }
 807
 808         memset(&params, 0, sizeof(params));
 809         memset(&csa_ie, 0, sizeof(csa_ie));
 810         err = ieee80211_parse_ch_switch_ie(sdata, elems,
 811                                            ifibss->chandef.chan->band,
 812                                            sta_flags, ifibss->bssid, &csa_ie);
 813         /* can't switch to destination channel, fail */
 814         if (err < 0)
 815                 goto disconnect;
 816
 817         /* did not contain a CSA */
 818         if (err)
 819                 return false;
 820
 821         /* channel switch is not supported, disconnect */
 822         if (!(sdata->local->hw.wiphy->flags & WIPHY_FLAG_HAS_CHANNEL_SWITCH))
 823                 goto disconnect;
 824
 825         params.count = csa_ie.count;
 826         params.chandef = csa_ie.chandef;
 827
 828         switch (ifibss->chandef.width) {
 829         case NL80211_CHAN_WIDTH_20_NOHT:
 830         case NL80211_CHAN_WIDTH_20:
 831         case NL80211_CHAN_WIDTH_40:
 832                 /* keep our current HT mode (HT20/HT40+/HT40-), even if
 833                  * another mode  has been announced. The mode is not adopted
 834                  * within the beacon while doing CSA and we should therefore
 835                  * keep the mode which we announce.
 836                  */
 837                 ch_type = cfg80211_get_chandef_type(&ifibss->chandef);
 838                 cfg80211_chandef_create(&params.chandef, params.chandef.chan,
 839                                         ch_type);
 840                 break;
 841         case NL80211_CHAN_WIDTH_5:
 842         case NL80211_CHAN_WIDTH_10:
 843                 if (params.chandef.width != ifibss->chandef.width) {
 844                         sdata_info(sdata,
 845                                    "IBSS %pM received channel switch from incompatible channel width (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
 846                                    ifibss->bssid,
 847                                    params.chandef.chan->center_freq,
 848                                    params.chandef.width,
 849                                    params.chandef.center_freq1,
 850                                    params.chandef.center_freq2);
 851                         goto disconnect;
 852                 }
 853                 break;
 854         default:
 855                 /* should not happen, sta_flags should prevent VHT modes. */
 856                 WARN_ON(1);
 857                 goto disconnect;
 858         }
 859
 860         if (!cfg80211_reg_can_beacon(sdata->local->hw.wiphy, &params.chandef,
 861                                      NL80211_IFTYPE_ADHOC)) {
 862                 sdata_info(sdata,
 863                            "IBSS %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
 864                            ifibss->bssid,
 865                            params.chandef.chan->center_freq,
 866                            params.chandef.width,
 867                            params.chandef.center_freq1,
 868                            params.chandef.center_freq2);
 869                 goto disconnect;
 870         }
 871
 872         err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
 873                                             &params.chandef,
 874                                             NL80211_IFTYPE_ADHOC);
 875         if (err < 0)
 876                 goto disconnect;
 877         if (err > 0 && !ifibss->userspace_handles_dfs) {
 878                 /* IBSS-DFS only allowed with a control program */
 879                 goto disconnect;
 880         }
 881
 882         params.radar_required = err;
 883
 884         if (cfg80211_chandef_identical(&params.chandef,
 885                                        &sdata->vif.bss_conf.chandef)) {
 886                 ibss_dbg(sdata,
 887                          "received csa with an identical chandef, ignoring\n");
 888                 return true;
 889         }
 890
 891         /* all checks done, now perform the channel switch. */
 892         ibss_dbg(sdata,
 893                  "received channel switch announcement to go to channel %d MHz\n",
 894                  params.chandef.chan->center_freq);
 895
 896         params.block_tx = !!csa_ie.mode;
 897
 898         if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev,
 899                                      &params))
 900                 goto disconnect;
 901
 902         ieee80211_ibss_csa_mark_radar(sdata);
 903
 904         return true;
 905 disconnect:
 906         ibss_dbg(sdata, "Can't handle channel switch, disconnect\n");
 907         ieee80211_queue_work(&sdata->local->hw,
 908                              &ifibss->csa_connection_drop_work);
 909
 910         ieee80211_ibss_csa_mark_radar(sdata);
 911
 912         return true;
 913 }
 914
 915 static void
 916 ieee80211_rx_mgmt_spectrum_mgmt(struct ieee80211_sub_if_data *sdata,
 917                                 struct ieee80211_mgmt *mgmt, size_t len,
 918                                 struct ieee80211_rx_status *rx_status,
 919                                 struct ieee802_11_elems *elems)
 920 {
 921         int required_len;
 922
 923         if (len < IEEE80211_MIN_ACTION_SIZE + 1)
 924                 return;
 925
 926         /* CSA is the only action we handle for now */
 927         if (mgmt->u.action.u.measurement.action_code !=
 928             WLAN_ACTION_SPCT_CHL_SWITCH)
 929                 return;
 930
 931         required_len = IEEE80211_MIN_ACTION_SIZE +
 932                        sizeof(mgmt->u.action.u.chan_switch);
 933         if (len < required_len)
 934                 return;
 935
 936         if (!sdata->vif.csa_active)
 937                 ieee80211_ibss_process_chanswitch(sdata, elems, false);
 938 }
 939
 940 static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data *sdata,
 941                                           struct ieee80211_mgmt *mgmt,
 942                                           size_t len)
 943 {
 944         u16 reason = le16_to_cpu(mgmt->u.deauth.reason_code);
 945
 946         if (len < IEEE80211_DEAUTH_FRAME_LEN)
 947                 return;
 948
 949         ibss_dbg(sdata, "RX DeAuth SA=%pM DA=%pM BSSID=%pM (reason: %d)\n",
 950                  mgmt->sa, mgmt->da, mgmt->bssid, reason);
 951         sta_info_destroy_addr(sdata, mgmt->sa);
 952 }
 953
 954 static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata,
 955                                         struct ieee80211_mgmt *mgmt,
 956                                         size_t len)
 957 {
 958         u16 auth_alg, auth_transaction;
 959
 960         sdata_assert_lock(sdata);
 961
 962         if (len < 24 + 6)
 963                 return;
 964
 965         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
 966         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
 967
 968         ibss_dbg(sdata,
 969                  "RX Auth SA=%pM DA=%pM BSSID=%pM (auth_transaction=%d)\n",
 970                  mgmt->sa, mgmt->da, mgmt->bssid, auth_transaction);
 971
 972         if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
 973                 return;
 974
 975         /*
 976          * IEEE 802.11 standard does not require authentication in IBSS
 977          * networks and most implementations do not seem to use it.
 978          * However, try to reply to authentication attempts if someone
 979          * has actually implemented this.
 980          */
 981         ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, 0, NULL, 0,
 982                             mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0, 0);
 983 }
 984
 985 static void ieee80211_update_sta_info(struct ieee80211_sub_if_data *sdata,
 986                                       struct ieee80211_mgmt *mgmt, size_t len,
 987                                       struct ieee80211_rx_status *rx_status,
 988                                       struct ieee802_11_elems *elems,
 989                                       struct ieee80211_channel *channel)
 990 {
 991         struct sta_info *sta;
 992         enum ieee80211_band band = rx_status->band;
 993         enum nl80211_bss_scan_width scan_width;
 994         struct ieee80211_local *local = sdata->local;
 995         struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band];
 996         bool rates_updated = false;
 997         u32 supp_rates = 0;
 998
 999         if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
1000                 return;
1001
1002         if (!ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid))
1003                 return;
1004
1005         rcu_read_lock();
1006         sta = sta_info_get(sdata, mgmt->sa);
1007
1008         if (elems->supp_rates) {
1009                 supp_rates = ieee80211_sta_get_rates(sdata, elems,
1010                                                      band, NULL);
1011                 if (sta) {
1012                         u32 prev_rates;
1013
1014                         prev_rates = sta->sta.supp_rates[band];
1015                         /* make sure mandatory rates are always added */
1016                         scan_width = NL80211_BSS_CHAN_WIDTH_20;
1017                         if (rx_status->flag & RX_FLAG_5MHZ)
1018                                 scan_width = NL80211_BSS_CHAN_WIDTH_5;
1019                         if (rx_status->flag & RX_FLAG_10MHZ)
1020                                 scan_width = NL80211_BSS_CHAN_WIDTH_10;
1021
1022                         sta->sta.supp_rates[band] = supp_rates |
1023                                 ieee80211_mandatory_rates(sband, scan_width);
1024                         if (sta->sta.supp_rates[band] != prev_rates) {
1025                                 ibss_dbg(sdata,
1026                                          "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n",
1027                                          sta->sta.addr, prev_rates,
1028                                          sta->sta.supp_rates[band]);
1029                                 rates_updated = true;
1030                         }
1031                 } else {
1032                         rcu_read_unlock();
1033                         sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid,
1034                                                      mgmt->sa, supp_rates);
1035                 }
1036         }
1037
1038         if (sta && !sta->sta.wme &&
1039             elems->wmm_info && local->hw.queues >= IEEE80211_NUM_ACS) {
1040                 sta->sta.wme = true;
1041                 ieee80211_check_fast_xmit(sta);
1042         }
1043
1044         if (sta && elems->ht_operation && elems->ht_cap_elem &&
1045             sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20_NOHT &&
1046             sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_5 &&
1047             sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_10) {
1048                 /* we both use HT */
1049                 struct ieee80211_ht_cap htcap_ie;
1050                 struct cfg80211_chan_def chandef;
1051                 enum ieee80211_sta_rx_bandwidth bw = sta->sta.bandwidth;
1052
1053                 ieee80211_ht_oper_to_chandef(channel,
1054                                              elems->ht_operation,
1055                                              &chandef);
1056
1057                 memcpy(&htcap_ie, elems->ht_cap_elem, sizeof(htcap_ie));
1058                 rates_updated |= ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
1059                                                                    &htcap_ie,
1060                                                                    sta);
1061
1062                 if (elems->vht_operation && elems->vht_cap_elem &&
1063                     sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20 &&
1064                     sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_40) {
1065                         /* we both use VHT */
1066                         struct ieee80211_vht_cap cap_ie;
1067                         struct ieee80211_sta_vht_cap cap = sta->sta.vht_cap;
1068
1069                         ieee80211_vht_oper_to_chandef(channel,
1070                                                       elems->vht_operation,
1071                                                       &chandef);
1072                         memcpy(&cap_ie, elems->vht_cap_elem, sizeof(cap_ie));
1073                         ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
1074                                                             &cap_ie, sta);
1075                         if (memcmp(&cap, &sta->sta.vht_cap, sizeof(cap)))
1076                                 rates_updated |= true;
1077                 }
1078
1079                 if (bw != sta->sta.bandwidth)
1080                         rates_updated |= true;
1081
1082                 if (!cfg80211_chandef_compatible(&sdata->u.ibss.chandef,
1083                                                  &chandef))
1084                         WARN_ON_ONCE(1);
1085         }
1086
1087         if (sta && rates_updated) {
1088                 u32 changed = IEEE80211_RC_SUPP_RATES_CHANGED;
1089                 u8 rx_nss = sta->sta.rx_nss;
1090
1091                 /* Force rx_nss recalculation */
1092                 sta->sta.rx_nss = 0;
1093                 rate_control_rate_init(sta);
1094                 if (sta->sta.rx_nss != rx_nss)
1095                         changed |= IEEE80211_RC_NSS_CHANGED;
1096
1097                 drv_sta_rc_update(local, sdata, &sta->sta, changed);
1098         }
1099
1100         rcu_read_unlock();
1101 }
1102
1103 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1104                                   struct ieee80211_mgmt *mgmt, size_t len,
1105                                   struct ieee80211_rx_status *rx_status,
1106                                   struct ieee802_11_elems *elems)
1107 {
1108         struct ieee80211_local *local = sdata->local;
1109         struct cfg80211_bss *cbss;
1110         struct ieee80211_bss *bss;
1111         struct ieee80211_channel *channel;
1112         u64 beacon_timestamp, rx_timestamp;
1113         u32 supp_rates = 0;
1114         enum ieee80211_band band = rx_status->band;
1115
1116         channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
1117         if (!channel)
1118                 return;
1119
1120         ieee80211_update_sta_info(sdata, mgmt, len, rx_status, elems, channel);
1121
1122         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1123                                         channel);
1124         if (!bss)
1125                 return;
1126
1127         cbss = container_of((void *)bss, struct cfg80211_bss, priv);
1128
1129         /* same for beacon and probe response */
1130         beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp);
1131
1132         /* check if we need to merge IBSS */
1133
1134         /* not an IBSS */
1135         if (!(cbss->capability & WLAN_CAPABILITY_IBSS))
1136                 goto put_bss;
1137
1138         /* different channel */
1139         if (sdata->u.ibss.fixed_channel &&
1140             sdata->u.ibss.chandef.chan != cbss->channel)
1141                 goto put_bss;
1142
1143         /* different SSID */
1144         if (elems->ssid_len != sdata->u.ibss.ssid_len ||
1145             memcmp(elems->ssid, sdata->u.ibss.ssid,
1146                                 sdata->u.ibss.ssid_len))
1147                 goto put_bss;
1148
1149         /* process channel switch */
1150         if (sdata->vif.csa_active ||
1151             ieee80211_ibss_process_chanswitch(sdata, elems, true))
1152                 goto put_bss;
1153
1154         /* same BSSID */
1155         if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid))
1156                 goto put_bss;
1157
1158         /* we use a fixed BSSID */
1159         if (sdata->u.ibss.fixed_bssid)
1160                 goto put_bss;
1161
1162         if (ieee80211_have_rx_timestamp(rx_status)) {
1163                 /* time when timestamp field was received */
1164                 rx_timestamp =
1165                         ieee80211_calculate_rx_timestamp(local, rx_status,
1166                                                          len + FCS_LEN, 24);
1167         } else {
1168                 /*
1169                  * second best option: get current TSF
1170                  * (will return -1 if not supported)
1171                  */
1172                 rx_timestamp = drv_get_tsf(local, sdata);
1173         }
1174
1175         ibss_dbg(sdata,
1176                  "RX beacon SA=%pM BSSID=%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
1177                  mgmt->sa, mgmt->bssid,
1178                  (unsigned long long)rx_timestamp,
1179                  (unsigned long long)beacon_timestamp,
1180                  (unsigned long long)(rx_timestamp - beacon_timestamp),
1181                  jiffies);
1182
1183         if (beacon_timestamp > rx_timestamp) {
1184                 ibss_dbg(sdata,
1185                          "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n",
1186                          mgmt->bssid);
1187                 ieee80211_sta_join_ibss(sdata, bss);
1188                 supp_rates = ieee80211_sta_get_rates(sdata, elems, band, NULL);
1189                 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa,
1190                                        supp_rates);
1191                 rcu_read_unlock();
1192         }
1193
1194  put_bss:
1195         ieee80211_rx_bss_put(local, bss);
1196 }
1197
1198 void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata,
1199                               const u8 *bssid, const u8 *addr,
1200                               u32 supp_rates)
1201 {
1202         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1203         struct ieee80211_local *local = sdata->local;
1204         struct sta_info *sta;
1205         struct ieee80211_chanctx_conf *chanctx_conf;
1206         struct ieee80211_supported_band *sband;
1207         enum nl80211_bss_scan_width scan_width;
1208         int band;
1209
1210         /*
1211          * XXX: Consider removing the least recently used entry and
1212          *      allow new one to be added.
1213          */
1214         if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
1215                 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
1216                                     sdata->name, addr);
1217                 return;
1218         }
1219
1220         if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH)
1221                 return;
1222
1223         if (!ether_addr_equal(bssid, sdata->u.ibss.bssid))
1224                 return;
1225
1226         rcu_read_lock();
1227         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1228         if (WARN_ON_ONCE(!chanctx_conf)) {
1229                 rcu_read_unlock();
1230                 return;
1231         }
1232         band = chanctx_conf->def.chan->band;
1233         scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
1234         rcu_read_unlock();
1235
1236         sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
1237         if (!sta)
1238                 return;
1239
1240         sta->rx_stats.last_rx = jiffies;
1241
1242         /* make sure mandatory rates are always added */
1243         sband = local->hw.wiphy->bands[band];
1244         sta->sta.supp_rates[band] = supp_rates |
1245                         ieee80211_mandatory_rates(sband, scan_width);
1246
1247         spin_lock(&ifibss->incomplete_lock);
1248         list_add(&sta->list, &ifibss->incomplete_stations);
1249         spin_unlock(&ifibss->incomplete_lock);
1250         ieee80211_queue_work(&local->hw, &sdata->work);
1251 }
1252
1253 static void ieee80211_ibss_sta_expire(struct ieee80211_sub_if_data *sdata)
1254 {
1255         struct ieee80211_local *local = sdata->local;
1256         struct sta_info *sta, *tmp;
1257         unsigned long exp_time = IEEE80211_IBSS_INACTIVITY_LIMIT;
1258         unsigned long exp_rsn = IEEE80211_IBSS_RSN_INACTIVITY_LIMIT;
1259
1260         mutex_lock(&local->sta_mtx);
1261
1262         list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
1263                 if (sdata != sta->sdata)
1264                         continue;
1265
1266                 if (time_after(jiffies, sta->rx_stats.last_rx + exp_time) ||
1267                     (time_after(jiffies, sta->rx_stats.last_rx + exp_rsn) &&
1268                      sta->sta_state != IEEE80211_STA_AUTHORIZED)) {
1269                         sta_dbg(sta->sdata, "expiring inactive %sSTA %pM\n",
1270                                 sta->sta_state != IEEE80211_STA_AUTHORIZED ?
1271                                 "not authorized " : "", sta->sta.addr);
1272
1273                         WARN_ON(__sta_info_destroy(sta));
1274                 }
1275         }
1276
1277         mutex_unlock(&local->sta_mtx);
1278 }
1279
1280 /*
1281  * This function is called with state == IEEE80211_IBSS_MLME_JOINED
1282  */
1283
1284 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
1285 {
1286         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1287         enum nl80211_bss_scan_width scan_width;
1288
1289         sdata_assert_lock(sdata);
1290
1291         mod_timer(&ifibss->timer,
1292                   round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
1293
1294         ieee80211_ibss_sta_expire(sdata);
1295
1296         if (time_before(jiffies, ifibss->last_scan_completed +
1297                        IEEE80211_IBSS_MERGE_INTERVAL))
1298                 return;
1299
1300         if (ieee80211_sta_active_ibss(sdata))
1301                 return;
1302
1303         if (ifibss->fixed_channel)
1304                 return;
1305
1306         sdata_info(sdata,
1307                    "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n");
1308
1309         scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
1310         ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len,
1311                                     NULL, 0, scan_width);
1312 }
1313
1314 static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
1315 {
1316         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1317         u8 bssid[ETH_ALEN];
1318         u16 capability;
1319         int i;
1320
1321         sdata_assert_lock(sdata);
1322
1323         if (ifibss->fixed_bssid) {
1324                 memcpy(bssid, ifibss->bssid, ETH_ALEN);
1325         } else {
1326                 /* Generate random, not broadcast, locally administered BSSID. Mix in
1327                  * own MAC address to make sure that devices that do not have proper
1328                  * random number generator get different BSSID. */
1329                 get_random_bytes(bssid, ETH_ALEN);
1330                 for (i = 0; i < ETH_ALEN; i++)
1331                         bssid[i] ^= sdata->vif.addr[i];
1332                 bssid[0] &= ~0x01;
1333                 bssid[0] |= 0x02;
1334         }
1335
1336         sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid);
1337
1338         capability = WLAN_CAPABILITY_IBSS;
1339
1340         if (ifibss->privacy)
1341                 capability |= WLAN_CAPABILITY_PRIVACY;
1342
1343         __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int,
1344                                   &ifibss->chandef, ifibss->basic_rates,
1345                                   capability, 0, true);
1346 }
1347
1348 static unsigned ibss_setup_channels(struct wiphy *wiphy,
1349                                     struct ieee80211_channel **channels,
1350                                     unsigned int channels_max,
1351                                     u32 center_freq, u32 width)
1352 {
1353         struct ieee80211_channel *chan = NULL;
1354         unsigned int n_chan = 0;
1355         u32 start_freq, end_freq, freq;
1356
1357         if (width <= 20) {
1358                 start_freq = center_freq;
1359                 end_freq = center_freq;
1360         } else {
1361                 start_freq = center_freq - width / 2 + 10;
1362                 end_freq = center_freq + width / 2 - 10;
1363         }
1364
1365         for (freq = start_freq; freq <= end_freq; freq += 20) {
1366                 chan = ieee80211_get_channel(wiphy, freq);
1367                 if (!chan)
1368                         continue;
1369                 if (n_chan >= channels_max)
1370                         return n_chan;
1371
1372                 channels[n_chan] = chan;
1373                 n_chan++;
1374         }
1375
1376         return n_chan;
1377 }
1378
1379 static unsigned int
1380 ieee80211_ibss_setup_scan_channels(struct wiphy *wiphy,
1381                                    const struct cfg80211_chan_def *chandef,
1382                                    struct ieee80211_channel **channels,
1383                                    unsigned int channels_max)
1384 {
1385         unsigned int n_chan = 0;
1386         u32 width, cf1, cf2 = 0;
1387
1388         switch (chandef->width) {
1389         case NL80211_CHAN_WIDTH_40:
1390                 width = 40;
1391                 break;
1392         case NL80211_CHAN_WIDTH_80P80:
1393                 cf2 = chandef->center_freq2;
1394                 /* fall through */
1395         case NL80211_CHAN_WIDTH_80:
1396                 width = 80;
1397                 break;
1398         case NL80211_CHAN_WIDTH_160:
1399                 width = 160;
1400                 break;
1401         default:
1402                 width = 20;
1403                 break;
1404         }
1405
1406         cf1 = chandef->center_freq1;
1407
1408         n_chan = ibss_setup_channels(wiphy, channels, channels_max, cf1, width);
1409
1410         if (cf2)
1411                 n_chan += ibss_setup_channels(wiphy, &channels[n_chan],
1412                                               channels_max - n_chan, cf2,
1413                                               width);
1414
1415         return n_chan;
1416 }
1417
1418 /*
1419  * This function is called with state == IEEE80211_IBSS_MLME_SEARCH
1420  */
1421
1422 static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
1423 {
1424         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1425         struct ieee80211_local *local = sdata->local;
1426         struct cfg80211_bss *cbss;
1427         struct ieee80211_channel *chan = NULL;
1428         const u8 *bssid = NULL;
1429         enum nl80211_bss_scan_width scan_width;
1430         int active_ibss;
1431
1432         sdata_assert_lock(sdata);
1433
1434         active_ibss = ieee80211_sta_active_ibss(sdata);
1435         ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss);
1436
1437         if (active_ibss)
1438                 return;
1439
1440         if (ifibss->fixed_bssid)
1441                 bssid = ifibss->bssid;
1442         if (ifibss->fixed_channel)
1443                 chan = ifibss->chandef.chan;
1444         if (!is_zero_ether_addr(ifibss->bssid))
1445                 bssid = ifibss->bssid;
1446         cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid,
1447                                 ifibss->ssid, ifibss->ssid_len,
1448                                 IEEE80211_BSS_TYPE_IBSS,
1449                                 IEEE80211_PRIVACY(ifibss->privacy));
1450
1451         if (cbss) {
1452                 struct ieee80211_bss *bss;
1453
1454                 bss = (void *)cbss->priv;
1455                 ibss_dbg(sdata,
1456                          "sta_find_ibss: selected %pM current %pM\n",
1457                          cbss->bssid, ifibss->bssid);
1458                 sdata_info(sdata,
1459                            "Selected IBSS BSSID %pM based on configured SSID\n",
1460                            cbss->bssid);
1461
1462                 ieee80211_sta_join_ibss(sdata, bss);
1463                 ieee80211_rx_bss_put(local, bss);
1464                 return;
1465         }
1466
1467         /* if a fixed bssid and a fixed freq have been provided create the IBSS
1468          * directly and do not waste time scanning
1469          */
1470         if (ifibss->fixed_bssid && ifibss->fixed_channel) {
1471                 sdata_info(sdata, "Created IBSS using preconfigured BSSID %pM\n",
1472                            bssid);
1473                 ieee80211_sta_create_ibss(sdata);
1474                 return;
1475         }
1476
1477
1478         ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n");
1479
1480         /* Selected IBSS not found in current scan results - try to scan */
1481         if (time_after(jiffies, ifibss->last_scan_completed +
1482                                         IEEE80211_SCAN_INTERVAL)) {
1483                 struct ieee80211_channel *channels[8];
1484                 unsigned int num;
1485
1486                 sdata_info(sdata, "Trigger new scan to find an IBSS to join\n");
1487
1488                 num = ieee80211_ibss_setup_scan_channels(local->hw.wiphy,
1489                                                          &ifibss->chandef,
1490                                                          channels,
1491                                                          ARRAY_SIZE(channels));
1492                 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
1493                 ieee80211_request_ibss_scan(sdata, ifibss->ssid,
1494                                             ifibss->ssid_len, channels, num,
1495                                             scan_width);
1496         } else {
1497                 int interval = IEEE80211_SCAN_INTERVAL;
1498
1499                 if (time_after(jiffies, ifibss->ibss_join_req +
1500                                IEEE80211_IBSS_JOIN_TIMEOUT))
1501                         ieee80211_sta_create_ibss(sdata);
1502
1503                 mod_timer(&ifibss->timer,
1504                           round_jiffies(jiffies + interval));
1505         }
1506 }
1507
1508 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
1509                                         struct sk_buff *req)
1510 {
1511         struct ieee80211_mgmt *mgmt = (void *)req->data;
1512         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1513         struct ieee80211_local *local = sdata->local;
1514         int tx_last_beacon, len = req->len;
1515         struct sk_buff *skb;
1516         struct beacon_data *presp;
1517         u8 *pos, *end;
1518
1519         sdata_assert_lock(sdata);
1520
1521         presp = rcu_dereference_protected(ifibss->presp,
1522                                           lockdep_is_held(&sdata->wdev.mtx));
1523
1524         if (ifibss->state != IEEE80211_IBSS_MLME_JOINED ||
1525             len < 24 + 2 || !presp)
1526                 return;
1527
1528         tx_last_beacon = drv_tx_last_beacon(local);
1529
1530         ibss_dbg(sdata,
1531                  "RX ProbeReq SA=%pM DA=%pM BSSID=%pM (tx_last_beacon=%d)\n",
1532                  mgmt->sa, mgmt->da, mgmt->bssid, tx_last_beacon);
1533
1534         if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da))
1535                 return;
1536
1537         if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) &&
1538             !is_broadcast_ether_addr(mgmt->bssid))
1539                 return;
1540
1541         end = ((u8 *) mgmt) + len;
1542         pos = mgmt->u.probe_req.variable;
1543         if (pos[0] != WLAN_EID_SSID ||
1544             pos + 2 + pos[1] > end) {
1545                 ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n",
1546                          mgmt->sa);
1547                 return;
1548         }
1549         if (pos[1] != 0 &&
1550             (pos[1] != ifibss->ssid_len ||
1551              memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) {
1552                 /* Ignore ProbeReq for foreign SSID */
1553                 return;
1554         }
1555
1556         /* Reply with ProbeResp */
1557         skb = dev_alloc_skb(local->tx_headroom + presp->head_len);
1558         if (!skb)
1559                 return;
1560
1561         skb_reserve(skb, local->tx_headroom);
1562         memcpy(skb_put(skb, presp->head_len), presp->head, presp->head_len);
1563
1564         memcpy(((struct ieee80211_mgmt *) skb->data)->da, mgmt->sa, ETH_ALEN);
1565         ibss_dbg(sdata, "Sending ProbeResp to %pM\n", mgmt->sa);
1566         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1567
1568         /* avoid excessive retries for probe request to wildcard SSIDs */
1569         if (pos[1] == 0)
1570                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_NO_ACK;
1571
1572         ieee80211_tx_skb(sdata, skb);
1573 }
1574
1575 static
1576 void ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data *sdata,
1577                                     struct ieee80211_mgmt *mgmt, size_t len,
1578                                     struct ieee80211_rx_status *rx_status)
1579 {
1580         size_t baselen;
1581         struct ieee802_11_elems elems;
1582
1583         BUILD_BUG_ON(offsetof(typeof(mgmt->u.probe_resp), variable) !=
1584                      offsetof(typeof(mgmt->u.beacon), variable));
1585
1586         /*
1587          * either beacon or probe_resp but the variable field is at the
1588          * same offset
1589          */
1590         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1591         if (baselen > len)
1592                 return;
1593
1594         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1595                                false, &elems);
1596
1597         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
1598 }
1599
1600 void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1601                                    struct sk_buff *skb)
1602 {
1603         struct ieee80211_rx_status *rx_status;
1604         struct ieee80211_mgmt *mgmt;
1605         u16 fc;
1606         struct ieee802_11_elems elems;
1607         int ies_len;
1608
1609         rx_status = IEEE80211_SKB_RXCB(skb);
1610         mgmt = (struct ieee80211_mgmt *) skb->data;
1611         fc = le16_to_cpu(mgmt->frame_control);
1612
1613         sdata_lock(sdata);
1614
1615         if (!sdata->u.ibss.ssid_len)
1616                 goto mgmt_out; /* not ready to merge yet */
1617
1618         switch (fc & IEEE80211_FCTL_STYPE) {
1619         case IEEE80211_STYPE_PROBE_REQ:
1620                 ieee80211_rx_mgmt_probe_req(sdata, skb);
1621                 break;
1622         case IEEE80211_STYPE_PROBE_RESP:
1623         case IEEE80211_STYPE_BEACON:
1624                 ieee80211_rx_mgmt_probe_beacon(sdata, mgmt, skb->len,
1625                                                rx_status);
1626                 break;
1627         case IEEE80211_STYPE_AUTH:
1628                 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len);
1629                 break;
1630         case IEEE80211_STYPE_DEAUTH:
1631                 ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len);
1632                 break;
1633         case IEEE80211_STYPE_ACTION:
1634                 switch (mgmt->u.action.category) {
1635                 case WLAN_CATEGORY_SPECTRUM_MGMT:
1636                         ies_len = skb->len -
1637                                   offsetof(struct ieee80211_mgmt,
1638                                            u.action.u.chan_switch.variable);
1639
1640                         if (ies_len < 0)
1641                                 break;
1642
1643                         ieee802_11_parse_elems(
1644                                 mgmt->u.action.u.chan_switch.variable,
1645                                 ies_len, true, &elems);
1646
1647                         if (elems.parse_error)
1648                                 break;
1649
1650                         ieee80211_rx_mgmt_spectrum_mgmt(sdata, mgmt, skb->len,
1651                                                         rx_status, &elems);
1652                         break;
1653                 }
1654         }
1655
1656  mgmt_out:
1657         sdata_unlock(sdata);
1658 }
1659
1660 void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata)
1661 {
1662         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1663         struct sta_info *sta;
1664
1665         sdata_lock(sdata);
1666
1667         /*
1668          * Work could be scheduled after scan or similar
1669          * when we aren't even joined (or trying) with a
1670          * network.
1671          */
1672         if (!ifibss->ssid_len)
1673                 goto out;
1674
1675         spin_lock_bh(&ifibss->incomplete_lock);
1676         while (!list_empty(&ifibss->incomplete_stations)) {
1677                 sta = list_first_entry(&ifibss->incomplete_stations,
1678                                        struct sta_info, list);
1679                 list_del(&sta->list);
1680                 spin_unlock_bh(&ifibss->incomplete_lock);
1681
1682                 ieee80211_ibss_finish_sta(sta);
1683                 rcu_read_unlock();
1684                 spin_lock_bh(&ifibss->incomplete_lock);
1685         }
1686         spin_unlock_bh(&ifibss->incomplete_lock);
1687
1688         switch (ifibss->state) {
1689         case IEEE80211_IBSS_MLME_SEARCH:
1690                 ieee80211_sta_find_ibss(sdata);
1691                 break;
1692         case IEEE80211_IBSS_MLME_JOINED:
1693                 ieee80211_sta_merge_ibss(sdata);
1694                 break;
1695         default:
1696                 WARN_ON(1);
1697                 break;
1698         }
1699
1700  out:
1701         sdata_unlock(sdata);
1702 }
1703
1704 static void ieee80211_ibss_timer(unsigned long data)
1705 {
1706         struct ieee80211_sub_if_data *sdata =
1707                 (struct ieee80211_sub_if_data *) data;
1708
1709         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1710 }
1711
1712 void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata)
1713 {
1714         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1715
1716         setup_timer(&ifibss->timer, ieee80211_ibss_timer,
1717                     (unsigned long) sdata);
1718         INIT_LIST_HEAD(&ifibss->incomplete_stations);
1719         spin_lock_init(&ifibss->incomplete_lock);
1720         INIT_WORK(&ifibss->csa_connection_drop_work,
1721                   ieee80211_csa_connection_drop_work);
1722 }
1723
1724 /* scan finished notification */
1725 void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local)
1726 {
1727         struct ieee80211_sub_if_data *sdata;
1728
1729         mutex_lock(&local->iflist_mtx);
1730         list_for_each_entry(sdata, &local->interfaces, list) {
1731                 if (!ieee80211_sdata_running(sdata))
1732                         continue;
1733                 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
1734                         continue;
1735                 sdata->u.ibss.last_scan_completed = jiffies;
1736                 ieee80211_queue_work(&local->hw, &sdata->work);
1737         }
1738         mutex_unlock(&local->iflist_mtx);
1739 }
1740
1741 int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
1742                         struct cfg80211_ibss_params *params)
1743 {
1744         u32 changed = 0;
1745         u32 rate_flags;
1746         struct ieee80211_supported_band *sband;
1747         enum ieee80211_chanctx_mode chanmode;
1748         struct ieee80211_local *local = sdata->local;
1749         int radar_detect_width = 0;
1750         int i;
1751         int ret;
1752
1753         ret = cfg80211_chandef_dfs_required(local->hw.wiphy,
1754                                             &params->chandef,
1755                                             sdata->wdev.iftype);
1756         if (ret < 0)
1757                 return ret;
1758
1759         if (ret > 0) {
1760                 if (!params->userspace_handles_dfs)
1761                         return -EINVAL;
1762                 radar_detect_width = BIT(params->chandef.width);
1763         }
1764
1765         chanmode = (params->channel_fixed && !ret) ?
1766                 IEEE80211_CHANCTX_SHARED : IEEE80211_CHANCTX_EXCLUSIVE;
1767
1768         mutex_lock(&local->chanctx_mtx);
1769         ret = ieee80211_check_combinations(sdata, &params->chandef, chanmode,
1770                                            radar_detect_width);
1771         mutex_unlock(&local->chanctx_mtx);
1772         if (ret < 0)
1773                 return ret;
1774
1775         if (params->bssid) {
1776                 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN);
1777                 sdata->u.ibss.fixed_bssid = true;
1778         } else
1779                 sdata->u.ibss.fixed_bssid = false;
1780
1781         sdata->u.ibss.privacy = params->privacy;
1782         sdata->u.ibss.control_port = params->control_port;
1783         sdata->u.ibss.userspace_handles_dfs = params->userspace_handles_dfs;
1784         sdata->u.ibss.basic_rates = params->basic_rates;
1785         sdata->u.ibss.last_scan_completed = jiffies;
1786
1787         /* fix basic_rates if channel does not support these rates */
1788         rate_flags = ieee80211_chandef_rate_flags(&params->chandef);
1789         sband = local->hw.wiphy->bands[params->chandef.chan->band];
1790         for (i = 0; i < sband->n_bitrates; i++) {
1791                 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
1792                         sdata->u.ibss.basic_rates &= ~BIT(i);
1793         }
1794         memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate,
1795                sizeof(params->mcast_rate));
1796
1797         sdata->vif.bss_conf.beacon_int = params->beacon_interval;
1798
1799         sdata->u.ibss.chandef = params->chandef;
1800         sdata->u.ibss.fixed_channel = params->channel_fixed;
1801
1802         if (params->ie) {
1803                 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len,
1804                                            GFP_KERNEL);
1805                 if (sdata->u.ibss.ie)
1806                         sdata->u.ibss.ie_len = params->ie_len;
1807         }
1808
1809         sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
1810         sdata->u.ibss.ibss_join_req = jiffies;
1811
1812         memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len);
1813         sdata->u.ibss.ssid_len = params->ssid_len;
1814
1815         memcpy(&sdata->u.ibss.ht_capa, &params->ht_capa,
1816                sizeof(sdata->u.ibss.ht_capa));
1817         memcpy(&sdata->u.ibss.ht_capa_mask, &params->ht_capa_mask,
1818                sizeof(sdata->u.ibss.ht_capa_mask));
1819
1820         /*
1821          * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is
1822          * reserved, but an HT STA shall protect HT transmissions as though
1823          * the HT Protection field were set to non-HT mixed mode.
1824          *
1825          * In an IBSS, the RIFS Mode field of the HT Operation element is
1826          * also reserved, but an HT STA shall operate as though this field
1827          * were set to 1.
1828          */
1829
1830         sdata->vif.bss_conf.ht_operation_mode |=
1831                   IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED
1832                 | IEEE80211_HT_PARAM_RIFS_MODE;
1833
1834         changed |= BSS_CHANGED_HT;
1835         ieee80211_bss_info_change_notify(sdata, changed);
1836
1837         sdata->smps_mode = IEEE80211_SMPS_OFF;
1838         sdata->needed_rx_chains = local->rx_chains;
1839
1840         ieee80211_queue_work(&local->hw, &sdata->work);
1841
1842         return 0;
1843 }
1844
1845 int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata)
1846 {
1847         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1848
1849         ieee80211_ibss_disconnect(sdata);
1850         ifibss->ssid_len = 0;
1851         eth_zero_addr(ifibss->bssid);
1852
1853         /* remove beacon */
1854         kfree(sdata->u.ibss.ie);
1855
1856         /* on the next join, re-program HT parameters */
1857         memset(&ifibss->ht_capa, 0, sizeof(ifibss->ht_capa));
1858         memset(&ifibss->ht_capa_mask, 0, sizeof(ifibss->ht_capa_mask));
1859
1860         synchronize_rcu();
1861
1862         skb_queue_purge(&sdata->skb_queue);
1863
1864         del_timer_sync(&sdata->u.ibss.timer);
1865
1866         return 0;
1867 }