kernel/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  *
  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_160:
 432                 chandef = sdata->u.ibss.chandef;
 433                 chandef.chan = cbss->channel;
 434                 break;
 435         default:
 436                 /* fall back to 20 MHz for unsupported modes */
 437                 cfg80211_chandef_create(&chandef, cbss->channel,
 438                                         NL80211_CHAN_WIDTH_20_NOHT);
 439                 break;
 440         }
 441
 442         sband = sdata->local->hw.wiphy->bands[cbss->channel->band];
 443         rate_flags = ieee80211_chandef_rate_flags(&sdata->u.ibss.chandef);
 444         shift = ieee80211_vif_get_shift(&sdata->vif);
 445
 446         basic_rates = 0;
 447
 448         for (i = 0; i < bss->supp_rates_len; i++) {
 449                 int rate = bss->supp_rates[i] & 0x7f;
 450                 bool is_basic = !!(bss->supp_rates[i] & 0x80);
 451
 452                 for (j = 0; j < sband->n_bitrates; j++) {
 453                         int brate;
 454                         if ((rate_flags & sband->bitrates[j].flags)
 455                             != rate_flags)
 456                                 continue;
 457
 458                         brate = DIV_ROUND_UP(sband->bitrates[j].bitrate,
 459                                              5 * (1 << shift));
 460                         if (brate == rate) {
 461                                 if (is_basic)
 462                                         basic_rates |= BIT(j);
 463                                 break;
 464                         }
 465                 }
 466         }
 467
 468         rcu_read_lock();
 469         ies = rcu_dereference(cbss->ies);
 470         tsf = ies->tsf;
 471         rcu_read_unlock();
 472
 473         __ieee80211_sta_join_ibss(sdata, cbss->bssid,
 474                                   beacon_int,
 475                                   &chandef,
 476                                   basic_rates,
 477                                   cbss->capability,
 478                                   tsf, false);
 479 }
 480
 481 int ieee80211_ibss_csa_beacon(struct ieee80211_sub_if_data *sdata,
 482                               struct cfg80211_csa_settings *csa_settings)
 483 {
 484         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 485         struct beacon_data *presp, *old_presp;
 486         struct cfg80211_bss *cbss;
 487         const struct cfg80211_bss_ies *ies;
 488         u16 capability = 0;
 489         u64 tsf;
 490         int ret = 0;
 491
 492         sdata_assert_lock(sdata);
 493
 494         if (ifibss->privacy)
 495                 capability = WLAN_CAPABILITY_PRIVACY;
 496
 497         cbss = cfg80211_get_bss(sdata->local->hw.wiphy, ifibss->chandef.chan,
 498                                 ifibss->bssid, ifibss->ssid,
 499                                 ifibss->ssid_len, IEEE80211_BSS_TYPE_IBSS,
 500                                 IEEE80211_PRIVACY(ifibss->privacy));
 501
 502         if (WARN_ON(!cbss)) {
 503                 ret = -EINVAL;
 504                 goto out;
 505         }
 506
 507         rcu_read_lock();
 508         ies = rcu_dereference(cbss->ies);
 509         tsf = ies->tsf;
 510         rcu_read_unlock();
 511         cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
 512
 513         old_presp = rcu_dereference_protected(ifibss->presp,
 514                                           lockdep_is_held(&sdata->wdev.mtx));
 515
 516         presp = ieee80211_ibss_build_presp(sdata,
 517                                            sdata->vif.bss_conf.beacon_int,
 518                                            sdata->vif.bss_conf.basic_rates,
 519                                            capability, tsf, &ifibss->chandef,
 520                                            NULL, csa_settings);
 521         if (!presp) {
 522                 ret = -ENOMEM;
 523                 goto out;
 524         }
 525
 526         rcu_assign_pointer(ifibss->presp, presp);
 527         if (old_presp)
 528                 kfree_rcu(old_presp, rcu_head);
 529
 530         return BSS_CHANGED_BEACON;
 531  out:
 532         return ret;
 533 }
 534
 535 int ieee80211_ibss_finish_csa(struct ieee80211_sub_if_data *sdata)
 536 {
 537         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 538         struct cfg80211_bss *cbss;
 539         int err, changed = 0;
 540
 541         sdata_assert_lock(sdata);
 542
 543         /* update cfg80211 bss information with the new channel */
 544         if (!is_zero_ether_addr(ifibss->bssid)) {
 545                 cbss = cfg80211_get_bss(sdata->local->hw.wiphy,
 546                                         ifibss->chandef.chan,
 547                                         ifibss->bssid, ifibss->ssid,
 548                                         ifibss->ssid_len,
 549                                         IEEE80211_BSS_TYPE_IBSS,
 550                                         IEEE80211_PRIVACY(ifibss->privacy));
 551                 /* XXX: should not really modify cfg80211 data */
 552                 if (cbss) {
 553                         cbss->channel = sdata->csa_chandef.chan;
 554                         cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
 555                 }
 556         }
 557
 558         ifibss->chandef = sdata->csa_chandef;
 559
 560         /* generate the beacon */
 561         err = ieee80211_ibss_csa_beacon(sdata, NULL);
 562         if (err < 0)
 563                 return err;
 564
 565         changed |= err;
 566
 567         return changed;
 568 }
 569
 570 void ieee80211_ibss_stop(struct ieee80211_sub_if_data *sdata)
 571 {
 572         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 573
 574         cancel_work_sync(&ifibss->csa_connection_drop_work);
 575 }
 576
 577 static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta)
 578         __acquires(RCU)
 579 {
 580         struct ieee80211_sub_if_data *sdata = sta->sdata;
 581         u8 addr[ETH_ALEN];
 582
 583         memcpy(addr, sta->sta.addr, ETH_ALEN);
 584
 585         ibss_dbg(sdata, "Adding new IBSS station %pM\n", addr);
 586
 587         sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
 588         sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
 589         /* authorize the station only if the network is not RSN protected. If
 590          * not wait for the userspace to authorize it */
 591         if (!sta->sdata->u.ibss.control_port)
 592                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
 593
 594         rate_control_rate_init(sta);
 595
 596         /* If it fails, maybe we raced another insertion? */
 597         if (sta_info_insert_rcu(sta))
 598                 return sta_info_get(sdata, addr);
 599         return sta;
 600 }
 601
 602 static struct sta_info *
 603 ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, const u8 *bssid,
 604                        const u8 *addr, u32 supp_rates)
 605         __acquires(RCU)
 606 {
 607         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 608         struct ieee80211_local *local = sdata->local;
 609         struct sta_info *sta;
 610         struct ieee80211_chanctx_conf *chanctx_conf;
 611         struct ieee80211_supported_band *sband;
 612         enum nl80211_bss_scan_width scan_width;
 613         int band;
 614
 615         /*
 616          * XXX: Consider removing the least recently used entry and
 617          *      allow new one to be added.
 618          */
 619         if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
 620                 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
 621                                     sdata->name, addr);
 622                 rcu_read_lock();
 623                 return NULL;
 624         }
 625
 626         if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) {
 627                 rcu_read_lock();
 628                 return NULL;
 629         }
 630
 631         if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) {
 632                 rcu_read_lock();
 633                 return NULL;
 634         }
 635
 636         rcu_read_lock();
 637         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 638         if (WARN_ON_ONCE(!chanctx_conf))
 639                 return NULL;
 640         band = chanctx_conf->def.chan->band;
 641         scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
 642         rcu_read_unlock();
 643
 644         sta = sta_info_alloc(sdata, addr, GFP_KERNEL);
 645         if (!sta) {
 646                 rcu_read_lock();
 647                 return NULL;
 648         }
 649
 650         sta->rx_stats.last_rx = jiffies;
 651
 652         /* make sure mandatory rates are always added */
 653         sband = local->hw.wiphy->bands[band];
 654         sta->sta.supp_rates[band] = supp_rates |
 655                         ieee80211_mandatory_rates(sband, scan_width);
 656
 657         return ieee80211_ibss_finish_sta(sta);
 658 }
 659
 660 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
 661 {
 662         struct ieee80211_local *local = sdata->local;
 663         int active = 0;
 664         struct sta_info *sta;
 665
 666         sdata_assert_lock(sdata);
 667
 668         rcu_read_lock();
 669
 670         list_for_each_entry_rcu(sta, &local->sta_list, list) {
 671                 if (sta->sdata == sdata &&
 672                     time_after(sta->rx_stats.last_rx +
 673                                IEEE80211_IBSS_MERGE_INTERVAL,
 674                                jiffies)) {
 675                         active++;
 676                         break;
 677                 }
 678         }
 679
 680         rcu_read_unlock();
 681
 682         return active;
 683 }
 684
 685 static void ieee80211_ibss_disconnect(struct ieee80211_sub_if_data *sdata)
 686 {
 687         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 688         struct ieee80211_local *local = sdata->local;
 689         struct cfg80211_bss *cbss;
 690         struct beacon_data *presp;
 691         struct sta_info *sta;
 692
 693         if (!is_zero_ether_addr(ifibss->bssid)) {
 694                 cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->chandef.chan,
 695                                         ifibss->bssid, ifibss->ssid,
 696                                         ifibss->ssid_len,
 697                                         IEEE80211_BSS_TYPE_IBSS,
 698                                         IEEE80211_PRIVACY(ifibss->privacy));
 699
 700                 if (cbss) {
 701                         cfg80211_unlink_bss(local->hw.wiphy, cbss);
 702                         cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
 703                 }
 704         }
 705
 706         ifibss->state = IEEE80211_IBSS_MLME_SEARCH;
 707
 708         sta_info_flush(sdata);
 709
 710         spin_lock_bh(&ifibss->incomplete_lock);
 711         while (!list_empty(&ifibss->incomplete_stations)) {
 712                 sta = list_first_entry(&ifibss->incomplete_stations,
 713                                        struct sta_info, list);
 714                 list_del(&sta->list);
 715                 spin_unlock_bh(&ifibss->incomplete_lock);
 716
 717                 sta_info_free(local, sta);
 718                 spin_lock_bh(&ifibss->incomplete_lock);
 719         }
 720         spin_unlock_bh(&ifibss->incomplete_lock);
 721
 722         netif_carrier_off(sdata->dev);
 723
 724         sdata->vif.bss_conf.ibss_joined = false;
 725         sdata->vif.bss_conf.ibss_creator = false;
 726         sdata->vif.bss_conf.enable_beacon = false;
 727         sdata->vif.bss_conf.ssid_len = 0;
 728
 729         /* remove beacon */
 730         presp = rcu_dereference_protected(ifibss->presp,
 731                                           lockdep_is_held(&sdata->wdev.mtx));
 732         RCU_INIT_POINTER(sdata->u.ibss.presp, NULL);
 733         if (presp)
 734                 kfree_rcu(presp, rcu_head);
 735
 736         clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state);
 737         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED |
 738                                                 BSS_CHANGED_IBSS);
 739         drv_leave_ibss(local, sdata);
 740         mutex_lock(&local->mtx);
 741         ieee80211_vif_release_channel(sdata);
 742         mutex_unlock(&local->mtx);
 743 }
 744
 745 static void ieee80211_csa_connection_drop_work(struct work_struct *work)
 746 {
 747         struct ieee80211_sub_if_data *sdata =
 748                 container_of(work, struct ieee80211_sub_if_data,
 749                              u.ibss.csa_connection_drop_work);
 750
 751         sdata_lock(sdata);
 752
 753         ieee80211_ibss_disconnect(sdata);
 754         synchronize_rcu();
 755         skb_queue_purge(&sdata->skb_queue);
 756
 757         /* trigger a scan to find another IBSS network to join */
 758         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
 759
 760         sdata_unlock(sdata);
 761 }
 762
 763 static void ieee80211_ibss_csa_mark_radar(struct ieee80211_sub_if_data *sdata)
 764 {
 765         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 766         int err;
 767
 768         /* if the current channel is a DFS channel, mark the channel as
 769          * unavailable.
 770          */
 771         err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
 772                                             &ifibss->chandef,
 773                                             NL80211_IFTYPE_ADHOC);
 774         if (err > 0)
 775                 cfg80211_radar_event(sdata->local->hw.wiphy, &ifibss->chandef,
 776                                      GFP_ATOMIC);
 777 }
 778
 779 static bool
 780 ieee80211_ibss_process_chanswitch(struct ieee80211_sub_if_data *sdata,
 781                                   struct ieee802_11_elems *elems,
 782                                   bool beacon)
 783 {
 784         struct cfg80211_csa_settings params;
 785         struct ieee80211_csa_ie csa_ie;
 786         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 787         enum nl80211_channel_type ch_type;
 788         int err;
 789         u32 sta_flags;
 790
 791         sdata_assert_lock(sdata);
 792
 793         sta_flags = IEEE80211_STA_DISABLE_VHT;
 794         switch (ifibss->chandef.width) {
 795         case NL80211_CHAN_WIDTH_5:
 796         case NL80211_CHAN_WIDTH_10:
 797         case NL80211_CHAN_WIDTH_20_NOHT:
 798                 sta_flags |= IEEE80211_STA_DISABLE_HT;
 799                 /* fall through */
 800         case NL80211_CHAN_WIDTH_20:
 801                 sta_flags |= IEEE80211_STA_DISABLE_40MHZ;
 802                 break;
 803         default:
 804                 break;
 805         }
 806
 807         memset(&params, 0, sizeof(params));
 808         memset(&csa_ie, 0, sizeof(csa_ie));
 809         err = ieee80211_parse_ch_switch_ie(sdata, elems,
 810                                            ifibss->chandef.chan->band,
 811                                            sta_flags, ifibss->bssid, &csa_ie);
 812         /* can't switch to destination channel, fail */
 813         if (err < 0)
 814                 goto disconnect;
 815
 816         /* did not contain a CSA */
 817         if (err)
 818                 return false;
 819
 820         /* channel switch is not supported, disconnect */
 821         if (!(sdata->local->hw.wiphy->flags & WIPHY_FLAG_HAS_CHANNEL_SWITCH))
 822                 goto disconnect;
 823
 824         params.count = csa_ie.count;
 825         params.chandef = csa_ie.chandef;
 826
 827         switch (ifibss->chandef.width) {
 828         case NL80211_CHAN_WIDTH_20_NOHT:
 829         case NL80211_CHAN_WIDTH_20:
 830         case NL80211_CHAN_WIDTH_40:
 831                 /* keep our current HT mode (HT20/HT40+/HT40-), even if
 832                  * another mode  has been announced. The mode is not adopted
 833                  * within the beacon while doing CSA and we should therefore
 834                  * keep the mode which we announce.
 835                  */
 836                 ch_type = cfg80211_get_chandef_type(&ifibss->chandef);
 837                 cfg80211_chandef_create(&params.chandef, params.chandef.chan,
 838                                         ch_type);
 839                 break;
 840         case NL80211_CHAN_WIDTH_5:
 841         case NL80211_CHAN_WIDTH_10:
 842                 if (params.chandef.width != ifibss->chandef.width) {
 843                         sdata_info(sdata,
 844                                    "IBSS %pM received channel switch from incompatible channel width (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
 845                                    ifibss->bssid,
 846                                    params.chandef.chan->center_freq,
 847                                    params.chandef.width,
 848                                    params.chandef.center_freq1,
 849                                    params.chandef.center_freq2);
 850                         goto disconnect;
 851                 }
 852                 break;
 853         default:
 854                 /* should not happen, sta_flags should prevent VHT modes. */
 855                 WARN_ON(1);
 856                 goto disconnect;
 857         }
 858
 859         if (!cfg80211_reg_can_beacon(sdata->local->hw.wiphy, &params.chandef,
 860                                      NL80211_IFTYPE_ADHOC)) {
 861                 sdata_info(sdata,
 862                            "IBSS %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
 863                            ifibss->bssid,
 864                            params.chandef.chan->center_freq,
 865                            params.chandef.width,
 866                            params.chandef.center_freq1,
 867                            params.chandef.center_freq2);
 868                 goto disconnect;
 869         }
 870
 871         err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
 872                                             &params.chandef,
 873                                             NL80211_IFTYPE_ADHOC);
 874         if (err < 0)
 875                 goto disconnect;
 876         if (err > 0 && !ifibss->userspace_handles_dfs) {
 877                 /* IBSS-DFS only allowed with a control program */
 878                 goto disconnect;
 879         }
 880
 881         params.radar_required = err;
 882
 883         if (cfg80211_chandef_identical(&params.chandef,
 884                                        &sdata->vif.bss_conf.chandef)) {
 885                 ibss_dbg(sdata,
 886                          "received csa with an identical chandef, ignoring\n");
 887                 return true;
 888         }
 889
 890         /* all checks done, now perform the channel switch. */
 891         ibss_dbg(sdata,
 892                  "received channel switch announcement to go to channel %d MHz\n",
 893                  params.chandef.chan->center_freq);
 894
 895         params.block_tx = !!csa_ie.mode;
 896
 897         if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev,
 898                                      &params))
 899                 goto disconnect;
 900
 901         ieee80211_ibss_csa_mark_radar(sdata);
 902
 903         return true;
 904 disconnect:
 905         ibss_dbg(sdata, "Can't handle channel switch, disconnect\n");
 906         ieee80211_queue_work(&sdata->local->hw,
 907                              &ifibss->csa_connection_drop_work);
 908
 909         ieee80211_ibss_csa_mark_radar(sdata);
 910
 911         return true;
 912 }
 913
 914 static void
 915 ieee80211_rx_mgmt_spectrum_mgmt(struct ieee80211_sub_if_data *sdata,
 916                                 struct ieee80211_mgmt *mgmt, size_t len,
 917                                 struct ieee80211_rx_status *rx_status,
 918                                 struct ieee802_11_elems *elems)
 919 {
 920         int required_len;
 921
 922         if (len < IEEE80211_MIN_ACTION_SIZE + 1)
 923                 return;
 924
 925         /* CSA is the only action we handle for now */
 926         if (mgmt->u.action.u.measurement.action_code !=
 927             WLAN_ACTION_SPCT_CHL_SWITCH)
 928                 return;
 929
 930         required_len = IEEE80211_MIN_ACTION_SIZE +
 931                        sizeof(mgmt->u.action.u.chan_switch);
 932         if (len < required_len)
 933                 return;
 934
 935         if (!sdata->vif.csa_active)
 936                 ieee80211_ibss_process_chanswitch(sdata, elems, false);
 937 }
 938
 939 static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data *sdata,
 940                                           struct ieee80211_mgmt *mgmt,
 941                                           size_t len)
 942 {
 943         u16 reason = le16_to_cpu(mgmt->u.deauth.reason_code);
 944
 945         if (len < IEEE80211_DEAUTH_FRAME_LEN)
 946                 return;
 947
 948         ibss_dbg(sdata, "RX DeAuth SA=%pM DA=%pM BSSID=%pM (reason: %d)\n",
 949                  mgmt->sa, mgmt->da, mgmt->bssid, reason);
 950         sta_info_destroy_addr(sdata, mgmt->sa);
 951 }
 952
 953 static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata,
 954                                         struct ieee80211_mgmt *mgmt,
 955                                         size_t len)
 956 {
 957         u16 auth_alg, auth_transaction;
 958
 959         sdata_assert_lock(sdata);
 960
 961         if (len < 24 + 6)
 962                 return;
 963
 964         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
 965         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
 966
 967         ibss_dbg(sdata,
 968                  "RX Auth SA=%pM DA=%pM BSSID=%pM (auth_transaction=%d)\n",
 969                  mgmt->sa, mgmt->da, mgmt->bssid, auth_transaction);
 970
 971         if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
 972                 return;
 973
 974         /*
 975          * IEEE 802.11 standard does not require authentication in IBSS
 976          * networks and most implementations do not seem to use it.
 977          * However, try to reply to authentication attempts if someone
 978          * has actually implemented this.
 979          */
 980         ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, 0, NULL, 0,
 981                             mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0, 0);
 982 }
 983
 984 static void ieee80211_update_sta_info(struct ieee80211_sub_if_data *sdata,
 985                                       struct ieee80211_mgmt *mgmt, size_t len,
 986                                       struct ieee80211_rx_status *rx_status,
 987                                       struct ieee802_11_elems *elems,
 988                                       struct ieee80211_channel *channel)
 989 {
 990         struct sta_info *sta;
 991         enum ieee80211_band band = rx_status->band;
 992         enum nl80211_bss_scan_width scan_width;
 993         struct ieee80211_local *local = sdata->local;
 994         struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band];
 995         bool rates_updated = false;
 996         u32 supp_rates = 0;
 997
 998         if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
 999                 return;
1000
1001         if (!ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid))
1002                 return;
1003
1004         rcu_read_lock();
1005         sta = sta_info_get(sdata, mgmt->sa);
1006
1007         if (elems->supp_rates) {
1008                 supp_rates = ieee80211_sta_get_rates(sdata, elems,
1009                                                      band, NULL);
1010                 if (sta) {
1011                         u32 prev_rates;
1012
1013                         prev_rates = sta->sta.supp_rates[band];
1014                         /* make sure mandatory rates are always added */
1015                         scan_width = NL80211_BSS_CHAN_WIDTH_20;
1016                         if (rx_status->flag & RX_FLAG_5MHZ)
1017                                 scan_width = NL80211_BSS_CHAN_WIDTH_5;
1018                         if (rx_status->flag & RX_FLAG_10MHZ)
1019                                 scan_width = NL80211_BSS_CHAN_WIDTH_10;
1020
1021                         sta->sta.supp_rates[band] = supp_rates |
1022                                 ieee80211_mandatory_rates(sband, scan_width);
1023                         if (sta->sta.supp_rates[band] != prev_rates) {
1024                                 ibss_dbg(sdata,
1025                                          "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n",
1026                                          sta->sta.addr, prev_rates,
1027                                          sta->sta.supp_rates[band]);
1028                                 rates_updated = true;
1029                         }
1030                 } else {
1031                         rcu_read_unlock();
1032                         sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid,
1033                                                      mgmt->sa, supp_rates);
1034                 }
1035         }
1036
1037         if (sta && !sta->sta.wme &&
1038             elems->wmm_info && local->hw.queues >= IEEE80211_NUM_ACS) {
1039                 sta->sta.wme = true;
1040                 ieee80211_check_fast_xmit(sta);
1041         }
1042
1043         if (sta && elems->ht_operation && elems->ht_cap_elem &&
1044             sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20_NOHT &&
1045             sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_5 &&
1046             sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_10) {
1047                 /* we both use HT */
1048                 struct ieee80211_ht_cap htcap_ie;
1049                 struct cfg80211_chan_def chandef;
1050                 enum ieee80211_sta_rx_bandwidth bw = sta->sta.bandwidth;
1051
1052                 ieee80211_ht_oper_to_chandef(channel,
1053                                              elems->ht_operation,
1054                                              &chandef);
1055
1056                 memcpy(&htcap_ie, elems->ht_cap_elem, sizeof(htcap_ie));
1057                 rates_updated |= ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
1058                                                                    &htcap_ie,
1059                                                                    sta);
1060
1061                 if (elems->vht_operation && elems->vht_cap_elem &&
1062                     sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20 &&
1063                     sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_40) {
1064                         /* we both use VHT */
1065                         struct ieee80211_vht_cap cap_ie;
1066                         struct ieee80211_sta_vht_cap cap = sta->sta.vht_cap;
1067
1068                         ieee80211_vht_oper_to_chandef(channel,
1069                                                       elems->vht_operation,
1070                                                       &chandef);
1071                         memcpy(&cap_ie, elems->vht_cap_elem, sizeof(cap_ie));
1072                         ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
1073                                                             &cap_ie, sta);
1074                         if (memcmp(&cap, &sta->sta.vht_cap, sizeof(cap)))
1075                                 rates_updated |= true;
1076                 }
1077
1078                 if (bw != sta->sta.bandwidth)
1079                         rates_updated |= true;
1080
1081                 if (!cfg80211_chandef_compatible(&sdata->u.ibss.chandef,
1082                                                  &chandef))
1083                         WARN_ON_ONCE(1);
1084         }
1085
1086         if (sta && rates_updated) {
1087                 u32 changed = IEEE80211_RC_SUPP_RATES_CHANGED;
1088                 u8 rx_nss = sta->sta.rx_nss;
1089
1090                 /* Force rx_nss recalculation */
1091                 sta->sta.rx_nss = 0;
1092                 rate_control_rate_init(sta);
1093                 if (sta->sta.rx_nss != rx_nss)
1094                         changed |= IEEE80211_RC_NSS_CHANGED;
1095
1096                 drv_sta_rc_update(local, sdata, &sta->sta, changed);
1097         }
1098
1099         rcu_read_unlock();
1100 }
1101
1102 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1103                                   struct ieee80211_mgmt *mgmt, size_t len,
1104                                   struct ieee80211_rx_status *rx_status,
1105                                   struct ieee802_11_elems *elems)
1106 {
1107         struct ieee80211_local *local = sdata->local;
1108         struct cfg80211_bss *cbss;
1109         struct ieee80211_bss *bss;
1110         struct ieee80211_channel *channel;
1111         u64 beacon_timestamp, rx_timestamp;
1112         u32 supp_rates = 0;
1113         enum ieee80211_band band = rx_status->band;
1114
1115         channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
1116         if (!channel)
1117                 return;
1118
1119         ieee80211_update_sta_info(sdata, mgmt, len, rx_status, elems, channel);
1120
1121         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1122                                         channel);
1123         if (!bss)
1124                 return;
1125
1126         cbss = container_of((void *)bss, struct cfg80211_bss, priv);
1127
1128         /* same for beacon and probe response */
1129         beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp);
1130
1131         /* check if we need to merge IBSS */
1132
1133         /* not an IBSS */
1134         if (!(cbss->capability & WLAN_CAPABILITY_IBSS))
1135                 goto put_bss;
1136
1137         /* different channel */
1138         if (sdata->u.ibss.fixed_channel &&
1139             sdata->u.ibss.chandef.chan != cbss->channel)
1140                 goto put_bss;
1141
1142         /* different SSID */
1143         if (elems->ssid_len != sdata->u.ibss.ssid_len ||
1144             memcmp(elems->ssid, sdata->u.ibss.ssid,
1145                                 sdata->u.ibss.ssid_len))
1146                 goto put_bss;
1147
1148         /* process channel switch */
1149         if (sdata->vif.csa_active ||
1150             ieee80211_ibss_process_chanswitch(sdata, elems, true))
1151                 goto put_bss;
1152
1153         /* same BSSID */
1154         if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid))
1155                 goto put_bss;
1156
1157         /* we use a fixed BSSID */
1158         if (sdata->u.ibss.fixed_bssid)
1159                 goto put_bss;
1160
1161         if (ieee80211_have_rx_timestamp(rx_status)) {
1162                 /* time when timestamp field was received */
1163                 rx_timestamp =
1164                         ieee80211_calculate_rx_timestamp(local, rx_status,
1165                                                          len + FCS_LEN, 24);
1166         } else {
1167                 /*
1168                  * second best option: get current TSF
1169                  * (will return -1 if not supported)
1170                  */
1171                 rx_timestamp = drv_get_tsf(local, sdata);
1172         }
1173
1174         ibss_dbg(sdata,
1175                  "RX beacon SA=%pM BSSID=%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
1176                  mgmt->sa, mgmt->bssid,
1177                  (unsigned long long)rx_timestamp,
1178                  (unsigned long long)beacon_timestamp,
1179                  (unsigned long long)(rx_timestamp - beacon_timestamp),
1180                  jiffies);
1181
1182         if (beacon_timestamp > rx_timestamp) {
1183                 ibss_dbg(sdata,
1184                          "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n",
1185                          mgmt->bssid);
1186                 ieee80211_sta_join_ibss(sdata, bss);
1187                 supp_rates = ieee80211_sta_get_rates(sdata, elems, band, NULL);
1188                 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa,
1189                                        supp_rates);
1190                 rcu_read_unlock();
1191         }
1192
1193  put_bss:
1194         ieee80211_rx_bss_put(local, bss);
1195 }
1196
1197 void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata,
1198                               const u8 *bssid, const u8 *addr,
1199                               u32 supp_rates)
1200 {
1201         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1202         struct ieee80211_local *local = sdata->local;
1203         struct sta_info *sta;
1204         struct ieee80211_chanctx_conf *chanctx_conf;
1205         struct ieee80211_supported_band *sband;
1206         enum nl80211_bss_scan_width scan_width;
1207         int band;
1208
1209         /*
1210          * XXX: Consider removing the least recently used entry and
1211          *      allow new one to be added.
1212          */
1213         if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
1214                 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
1215                                     sdata->name, addr);
1216                 return;
1217         }
1218
1219         if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH)
1220                 return;
1221
1222         if (!ether_addr_equal(bssid, sdata->u.ibss.bssid))
1223                 return;
1224
1225         rcu_read_lock();
1226         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1227         if (WARN_ON_ONCE(!chanctx_conf)) {
1228                 rcu_read_unlock();
1229                 return;
1230         }
1231         band = chanctx_conf->def.chan->band;
1232         scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
1233         rcu_read_unlock();
1234
1235         sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
1236         if (!sta)
1237                 return;
1238
1239         sta->rx_stats.last_rx = jiffies;
1240
1241         /* make sure mandatory rates are always added */
1242         sband = local->hw.wiphy->bands[band];
1243         sta->sta.supp_rates[band] = supp_rates |
1244                         ieee80211_mandatory_rates(sband, scan_width);
1245
1246         spin_lock(&ifibss->incomplete_lock);
1247         list_add(&sta->list, &ifibss->incomplete_stations);
1248         spin_unlock(&ifibss->incomplete_lock);
1249         ieee80211_queue_work(&local->hw, &sdata->work);
1250 }
1251
1252 static void ieee80211_ibss_sta_expire(struct ieee80211_sub_if_data *sdata)
1253 {
1254         struct ieee80211_local *local = sdata->local;
1255         struct sta_info *sta, *tmp;
1256         unsigned long exp_time = IEEE80211_IBSS_INACTIVITY_LIMIT;
1257         unsigned long exp_rsn = IEEE80211_IBSS_RSN_INACTIVITY_LIMIT;
1258
1259         mutex_lock(&local->sta_mtx);
1260
1261         list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
1262                 if (sdata != sta->sdata)
1263                         continue;
1264
1265                 if (time_after(jiffies, sta->rx_stats.last_rx + exp_time) ||
1266                     (time_after(jiffies, sta->rx_stats.last_rx + exp_rsn) &&
1267                      sta->sta_state != IEEE80211_STA_AUTHORIZED)) {
1268                         sta_dbg(sta->sdata, "expiring inactive %sSTA %pM\n",
1269                                 sta->sta_state != IEEE80211_STA_AUTHORIZED ?
1270                                 "not authorized " : "", sta->sta.addr);
1271
1272                         WARN_ON(__sta_info_destroy(sta));
1273                 }
1274         }
1275
1276         mutex_unlock(&local->sta_mtx);
1277 }
1278
1279 /*
1280  * This function is called with state == IEEE80211_IBSS_MLME_JOINED
1281  */
1282
1283 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
1284 {
1285         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1286         enum nl80211_bss_scan_width scan_width;
1287
1288         sdata_assert_lock(sdata);
1289
1290         mod_timer(&ifibss->timer,
1291                   round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
1292
1293         ieee80211_ibss_sta_expire(sdata);
1294
1295         if (time_before(jiffies, ifibss->last_scan_completed +
1296                        IEEE80211_IBSS_MERGE_INTERVAL))
1297                 return;
1298
1299         if (ieee80211_sta_active_ibss(sdata))
1300                 return;
1301
1302         if (ifibss->fixed_channel)
1303                 return;
1304
1305         sdata_info(sdata,
1306                    "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n");
1307
1308         scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
1309         ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len,
1310                                     NULL, 0, scan_width);
1311 }
1312
1313 static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
1314 {
1315         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1316         u8 bssid[ETH_ALEN];
1317         u16 capability;
1318         int i;
1319
1320         sdata_assert_lock(sdata);
1321
1322         if (ifibss->fixed_bssid) {
1323                 memcpy(bssid, ifibss->bssid, ETH_ALEN);
1324         } else {
1325                 /* Generate random, not broadcast, locally administered BSSID. Mix in
1326                  * own MAC address to make sure that devices that do not have proper
1327                  * random number generator get different BSSID. */
1328                 get_random_bytes(bssid, ETH_ALEN);
1329                 for (i = 0; i < ETH_ALEN; i++)
1330                         bssid[i] ^= sdata->vif.addr[i];
1331                 bssid[0] &= ~0x01;
1332                 bssid[0] |= 0x02;
1333         }
1334
1335         sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid);
1336
1337         capability = WLAN_CAPABILITY_IBSS;
1338
1339         if (ifibss->privacy)
1340                 capability |= WLAN_CAPABILITY_PRIVACY;
1341
1342         __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int,
1343                                   &ifibss->chandef, ifibss->basic_rates,
1344                                   capability, 0, true);
1345 }
1346
1347 static unsigned ibss_setup_channels(struct wiphy *wiphy,
1348                                     struct ieee80211_channel **channels,
1349                                     unsigned int channels_max,
1350                                     u32 center_freq, u32 width)
1351 {
1352         struct ieee80211_channel *chan = NULL;
1353         unsigned int n_chan = 0;
1354         u32 start_freq, end_freq, freq;
1355
1356         if (width <= 20) {
1357                 start_freq = center_freq;
1358                 end_freq = center_freq;
1359         } else {
1360                 start_freq = center_freq - width / 2 + 10;
1361                 end_freq = center_freq + width / 2 - 10;
1362         }
1363
1364         for (freq = start_freq; freq <= end_freq; freq += 20) {
1365                 chan = ieee80211_get_channel(wiphy, freq);
1366                 if (!chan)
1367                         continue;
1368                 if (n_chan >= channels_max)
1369                         return n_chan;
1370
1371                 channels[n_chan] = chan;
1372                 n_chan++;
1373         }
1374
1375         return n_chan;
1376 }
1377
1378 static unsigned int
1379 ieee80211_ibss_setup_scan_channels(struct wiphy *wiphy,
1380                                    const struct cfg80211_chan_def *chandef,
1381                                    struct ieee80211_channel **channels,
1382                                    unsigned int channels_max)
1383 {
1384         unsigned int n_chan = 0;
1385         u32 width, cf1, cf2 = 0;
1386
1387         switch (chandef->width) {
1388         case NL80211_CHAN_WIDTH_40:
1389                 width = 40;
1390                 break;
1391         case NL80211_CHAN_WIDTH_80P80:
1392                 cf2 = chandef->center_freq2;
1393                 /* fall through */
1394         case NL80211_CHAN_WIDTH_80:
1395                 width = 80;
1396                 break;
1397         case NL80211_CHAN_WIDTH_160:
1398                 width = 160;
1399                 break;
1400         default:
1401                 width = 20;
1402                 break;
1403         }
1404
1405         cf1 = chandef->center_freq1;
1406
1407         n_chan = ibss_setup_channels(wiphy, channels, channels_max, cf1, width);
1408
1409         if (cf2)
1410                 n_chan += ibss_setup_channels(wiphy, &channels[n_chan],
1411                                               channels_max - n_chan, cf2,
1412                                               width);
1413
1414         return n_chan;
1415 }
1416
1417 /*
1418  * This function is called with state == IEEE80211_IBSS_MLME_SEARCH
1419  */
1420
1421 static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
1422 {
1423         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1424         struct ieee80211_local *local = sdata->local;
1425         struct cfg80211_bss *cbss;
1426         struct ieee80211_channel *chan = NULL;
1427         const u8 *bssid = NULL;
1428         enum nl80211_bss_scan_width scan_width;
1429         int active_ibss;
1430
1431         sdata_assert_lock(sdata);
1432
1433         active_ibss = ieee80211_sta_active_ibss(sdata);
1434         ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss);
1435
1436         if (active_ibss)
1437                 return;
1438
1439         if (ifibss->fixed_bssid)
1440                 bssid = ifibss->bssid;
1441         if (ifibss->fixed_channel)
1442                 chan = ifibss->chandef.chan;
1443         if (!is_zero_ether_addr(ifibss->bssid))
1444                 bssid = ifibss->bssid;
1445         cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid,
1446                                 ifibss->ssid, ifibss->ssid_len,
1447                                 IEEE80211_BSS_TYPE_IBSS,
1448                                 IEEE80211_PRIVACY(ifibss->privacy));
1449
1450         if (cbss) {
1451                 struct ieee80211_bss *bss;
1452
1453                 bss = (void *)cbss->priv;
1454                 ibss_dbg(sdata,
1455                          "sta_find_ibss: selected %pM current %pM\n",
1456                          cbss->bssid, ifibss->bssid);
1457                 sdata_info(sdata,
1458                            "Selected IBSS BSSID %pM based on configured SSID\n",
1459                            cbss->bssid);
1460
1461                 ieee80211_sta_join_ibss(sdata, bss);
1462                 ieee80211_rx_bss_put(local, bss);
1463                 return;
1464         }
1465
1466         /* if a fixed bssid and a fixed freq have been provided create the IBSS
1467          * directly and do not waste time scanning
1468          */
1469         if (ifibss->fixed_bssid && ifibss->fixed_channel) {
1470                 sdata_info(sdata, "Created IBSS using preconfigured BSSID %pM\n",
1471                            bssid);
1472                 ieee80211_sta_create_ibss(sdata);
1473                 return;
1474         }
1475
1476
1477         ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n");
1478
1479         /* Selected IBSS not found in current scan results - try to scan */
1480         if (time_after(jiffies, ifibss->last_scan_completed +
1481                                         IEEE80211_SCAN_INTERVAL)) {
1482                 struct ieee80211_channel *channels[8];
1483                 unsigned int num;
1484
1485                 sdata_info(sdata, "Trigger new scan to find an IBSS to join\n");
1486
1487                 num = ieee80211_ibss_setup_scan_channels(local->hw.wiphy,
1488                                                          &ifibss->chandef,
1489                                                          channels,
1490                                                          ARRAY_SIZE(channels));
1491                 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
1492                 ieee80211_request_ibss_scan(sdata, ifibss->ssid,
1493                                             ifibss->ssid_len, channels, num,
1494                                             scan_width);
1495         } else {
1496                 int interval = IEEE80211_SCAN_INTERVAL;
1497
1498                 if (time_after(jiffies, ifibss->ibss_join_req +
1499                                IEEE80211_IBSS_JOIN_TIMEOUT))
1500                         ieee80211_sta_create_ibss(sdata);
1501
1502                 mod_timer(&ifibss->timer,
1503                           round_jiffies(jiffies + interval));
1504         }
1505 }
1506
1507 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
1508                                         struct sk_buff *req)
1509 {
1510         struct ieee80211_mgmt *mgmt = (void *)req->data;
1511         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1512         struct ieee80211_local *local = sdata->local;
1513         int tx_last_beacon, len = req->len;
1514         struct sk_buff *skb;
1515         struct beacon_data *presp;
1516         u8 *pos, *end;
1517
1518         sdata_assert_lock(sdata);
1519
1520         presp = rcu_dereference_protected(ifibss->presp,
1521                                           lockdep_is_held(&sdata->wdev.mtx));
1522
1523         if (ifibss->state != IEEE80211_IBSS_MLME_JOINED ||
1524             len < 24 + 2 || !presp)
1525                 return;
1526
1527         tx_last_beacon = drv_tx_last_beacon(local);
1528
1529         ibss_dbg(sdata,
1530                  "RX ProbeReq SA=%pM DA=%pM BSSID=%pM (tx_last_beacon=%d)\n",
1531                  mgmt->sa, mgmt->da, mgmt->bssid, tx_last_beacon);
1532
1533         if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da))
1534                 return;
1535
1536         if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) &&
1537             !is_broadcast_ether_addr(mgmt->bssid))
1538                 return;
1539
1540         end = ((u8 *) mgmt) + len;
1541         pos = mgmt->u.probe_req.variable;
1542         if (pos[0] != WLAN_EID_SSID ||
1543             pos + 2 + pos[1] > end) {
1544                 ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n",
1545                          mgmt->sa);
1546                 return;
1547         }
1548         if (pos[1] != 0 &&
1549             (pos[1] != ifibss->ssid_len ||
1550              memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) {
1551                 /* Ignore ProbeReq for foreign SSID */
1552                 return;
1553         }
1554
1555         /* Reply with ProbeResp */
1556         skb = dev_alloc_skb(local->tx_headroom + presp->head_len);
1557         if (!skb)
1558                 return;
1559
1560         skb_reserve(skb, local->tx_headroom);
1561         memcpy(skb_put(skb, presp->head_len), presp->head, presp->head_len);
1562
1563         memcpy(((struct ieee80211_mgmt *) skb->data)->da, mgmt->sa, ETH_ALEN);
1564         ibss_dbg(sdata, "Sending ProbeResp to %pM\n", mgmt->sa);
1565         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1566
1567         /* avoid excessive retries for probe request to wildcard SSIDs */
1568         if (pos[1] == 0)
1569                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_NO_ACK;
1570
1571         ieee80211_tx_skb(sdata, skb);
1572 }
1573
1574 static
1575 void ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data *sdata,
1576                                     struct ieee80211_mgmt *mgmt, size_t len,
1577                                     struct ieee80211_rx_status *rx_status)
1578 {
1579         size_t baselen;
1580         struct ieee802_11_elems elems;
1581
1582         BUILD_BUG_ON(offsetof(typeof(mgmt->u.probe_resp), variable) !=
1583                      offsetof(typeof(mgmt->u.beacon), variable));
1584
1585         /*
1586          * either beacon or probe_resp but the variable field is at the
1587          * same offset
1588          */
1589         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1590         if (baselen > len)
1591                 return;
1592
1593         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1594                                false, &elems);
1595
1596         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
1597 }
1598
1599 void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1600                                    struct sk_buff *skb)
1601 {
1602         struct ieee80211_rx_status *rx_status;
1603         struct ieee80211_mgmt *mgmt;
1604         u16 fc;
1605         struct ieee802_11_elems elems;
1606         int ies_len;
1607
1608         rx_status = IEEE80211_SKB_RXCB(skb);
1609         mgmt = (struct ieee80211_mgmt *) skb->data;
1610         fc = le16_to_cpu(mgmt->frame_control);
1611
1612         sdata_lock(sdata);
1613
1614         if (!sdata->u.ibss.ssid_len)
1615                 goto mgmt_out; /* not ready to merge yet */
1616
1617         switch (fc & IEEE80211_FCTL_STYPE) {
1618         case IEEE80211_STYPE_PROBE_REQ:
1619                 ieee80211_rx_mgmt_probe_req(sdata, skb);
1620                 break;
1621         case IEEE80211_STYPE_PROBE_RESP:
1622         case IEEE80211_STYPE_BEACON:
1623                 ieee80211_rx_mgmt_probe_beacon(sdata, mgmt, skb->len,
1624                                                rx_status);
1625                 break;
1626         case IEEE80211_STYPE_AUTH:
1627                 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len);
1628                 break;
1629         case IEEE80211_STYPE_DEAUTH:
1630                 ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len);
1631                 break;
1632         case IEEE80211_STYPE_ACTION:
1633                 switch (mgmt->u.action.category) {
1634                 case WLAN_CATEGORY_SPECTRUM_MGMT:
1635                         ies_len = skb->len -
1636                                   offsetof(struct ieee80211_mgmt,
1637                                            u.action.u.chan_switch.variable);
1638
1639                         if (ies_len < 0)
1640                                 break;
1641
1642                         ieee802_11_parse_elems(
1643                                 mgmt->u.action.u.chan_switch.variable,
1644                                 ies_len, true, &elems);
1645
1646                         if (elems.parse_error)
1647                                 break;
1648
1649                         ieee80211_rx_mgmt_spectrum_mgmt(sdata, mgmt, skb->len,
1650                                                         rx_status, &elems);
1651                         break;
1652                 }
1653         }
1654
1655  mgmt_out:
1656         sdata_unlock(sdata);
1657 }
1658
1659 void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata)
1660 {
1661         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1662         struct sta_info *sta;
1663
1664         sdata_lock(sdata);
1665
1666         /*
1667          * Work could be scheduled after scan or similar
1668          * when we aren't even joined (or trying) with a
1669          * network.
1670          */
1671         if (!ifibss->ssid_len)
1672                 goto out;
1673
1674         spin_lock_bh(&ifibss->incomplete_lock);
1675         while (!list_empty(&ifibss->incomplete_stations)) {
1676                 sta = list_first_entry(&ifibss->incomplete_stations,
1677                                        struct sta_info, list);
1678                 list_del(&sta->list);
1679                 spin_unlock_bh(&ifibss->incomplete_lock);
1680
1681                 ieee80211_ibss_finish_sta(sta);
1682                 rcu_read_unlock();
1683                 spin_lock_bh(&ifibss->incomplete_lock);
1684         }
1685         spin_unlock_bh(&ifibss->incomplete_lock);
1686
1687         switch (ifibss->state) {
1688         case IEEE80211_IBSS_MLME_SEARCH:
1689                 ieee80211_sta_find_ibss(sdata);
1690                 break;
1691         case IEEE80211_IBSS_MLME_JOINED:
1692                 ieee80211_sta_merge_ibss(sdata);
1693                 break;
1694         default:
1695                 WARN_ON(1);
1696                 break;
1697         }
1698
1699  out:
1700         sdata_unlock(sdata);
1701 }
1702
1703 static void ieee80211_ibss_timer(unsigned long data)
1704 {
1705         struct ieee80211_sub_if_data *sdata =
1706                 (struct ieee80211_sub_if_data *) data;
1707
1708         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1709 }
1710
1711 void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata)
1712 {
1713         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1714
1715         setup_timer(&ifibss->timer, ieee80211_ibss_timer,
1716                     (unsigned long) sdata);
1717         INIT_LIST_HEAD(&ifibss->incomplete_stations);
1718         spin_lock_init(&ifibss->incomplete_lock);
1719         INIT_WORK(&ifibss->csa_connection_drop_work,
1720                   ieee80211_csa_connection_drop_work);
1721 }
1722
1723 /* scan finished notification */
1724 void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local)
1725 {
1726         struct ieee80211_sub_if_data *sdata;
1727
1728         mutex_lock(&local->iflist_mtx);
1729         list_for_each_entry(sdata, &local->interfaces, list) {
1730                 if (!ieee80211_sdata_running(sdata))
1731                         continue;
1732                 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
1733                         continue;
1734                 sdata->u.ibss.last_scan_completed = jiffies;
1735         }
1736         mutex_unlock(&local->iflist_mtx);
1737 }
1738
1739 int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
1740                         struct cfg80211_ibss_params *params)
1741 {
1742         u32 changed = 0;
1743         u32 rate_flags;
1744         struct ieee80211_supported_band *sband;
1745         enum ieee80211_chanctx_mode chanmode;
1746         struct ieee80211_local *local = sdata->local;
1747         int radar_detect_width = 0;
1748         int i;
1749         int ret;
1750
1751         ret = cfg80211_chandef_dfs_required(local->hw.wiphy,
1752                                             &params->chandef,
1753                                             sdata->wdev.iftype);
1754         if (ret < 0)
1755                 return ret;
1756
1757         if (ret > 0) {
1758                 if (!params->userspace_handles_dfs)
1759                         return -EINVAL;
1760                 radar_detect_width = BIT(params->chandef.width);
1761         }
1762
1763         chanmode = (params->channel_fixed && !ret) ?
1764                 IEEE80211_CHANCTX_SHARED : IEEE80211_CHANCTX_EXCLUSIVE;
1765
1766         mutex_lock(&local->chanctx_mtx);
1767         ret = ieee80211_check_combinations(sdata, &params->chandef, chanmode,
1768                                            radar_detect_width);
1769         mutex_unlock(&local->chanctx_mtx);
1770         if (ret < 0)
1771                 return ret;
1772
1773         if (params->bssid) {
1774                 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN);
1775                 sdata->u.ibss.fixed_bssid = true;
1776         } else
1777                 sdata->u.ibss.fixed_bssid = false;
1778
1779         sdata->u.ibss.privacy = params->privacy;
1780         sdata->u.ibss.control_port = params->control_port;
1781         sdata->u.ibss.userspace_handles_dfs = params->userspace_handles_dfs;
1782         sdata->u.ibss.basic_rates = params->basic_rates;
1783         sdata->u.ibss.last_scan_completed = jiffies;
1784
1785         /* fix basic_rates if channel does not support these rates */
1786         rate_flags = ieee80211_chandef_rate_flags(&params->chandef);
1787         sband = local->hw.wiphy->bands[params->chandef.chan->band];
1788         for (i = 0; i < sband->n_bitrates; i++) {
1789                 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
1790                         sdata->u.ibss.basic_rates &= ~BIT(i);
1791         }
1792         memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate,
1793                sizeof(params->mcast_rate));
1794
1795         sdata->vif.bss_conf.beacon_int = params->beacon_interval;
1796
1797         sdata->u.ibss.chandef = params->chandef;
1798         sdata->u.ibss.fixed_channel = params->channel_fixed;
1799
1800         if (params->ie) {
1801                 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len,
1802                                            GFP_KERNEL);
1803                 if (sdata->u.ibss.ie)
1804                         sdata->u.ibss.ie_len = params->ie_len;
1805         }
1806
1807         sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
1808         sdata->u.ibss.ibss_join_req = jiffies;
1809
1810         memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len);
1811         sdata->u.ibss.ssid_len = params->ssid_len;
1812
1813         memcpy(&sdata->u.ibss.ht_capa, &params->ht_capa,
1814                sizeof(sdata->u.ibss.ht_capa));
1815         memcpy(&sdata->u.ibss.ht_capa_mask, &params->ht_capa_mask,
1816                sizeof(sdata->u.ibss.ht_capa_mask));
1817
1818         /*
1819          * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is
1820          * reserved, but an HT STA shall protect HT transmissions as though
1821          * the HT Protection field were set to non-HT mixed mode.
1822          *
1823          * In an IBSS, the RIFS Mode field of the HT Operation element is
1824          * also reserved, but an HT STA shall operate as though this field
1825          * were set to 1.
1826          */
1827
1828         sdata->vif.bss_conf.ht_operation_mode |=
1829                   IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED
1830                 | IEEE80211_HT_PARAM_RIFS_MODE;
1831
1832         changed |= BSS_CHANGED_HT;
1833         ieee80211_bss_info_change_notify(sdata, changed);
1834
1835         sdata->smps_mode = IEEE80211_SMPS_OFF;
1836         sdata->needed_rx_chains = local->rx_chains;
1837
1838         ieee80211_queue_work(&local->hw, &sdata->work);
1839
1840         return 0;
1841 }
1842
1843 int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata)
1844 {
1845         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1846
1847         ieee80211_ibss_disconnect(sdata);
1848         ifibss->ssid_len = 0;
1849         eth_zero_addr(ifibss->bssid);
1850
1851         /* remove beacon */
1852         kfree(sdata->u.ibss.ie);
1853
1854         /* on the next join, re-program HT parameters */
1855         memset(&ifibss->ht_capa, 0, sizeof(ifibss->ht_capa));
1856         memset(&ifibss->ht_capa_mask, 0, sizeof(ifibss->ht_capa_mask));
1857
1858         synchronize_rcu();
1859
1860         skb_queue_purge(&sdata->skb_queue);
1861
1862         del_timer_sync(&sdata->u.ibss.timer);
1863
1864         return 0;
1865 }