net/mac80211/ibss.c

   1 /*
   2  * IBSS mode implementation
   3  * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
   4  * Copyright 2004, Instant802 Networks, Inc.
   5  * Copyright 2005, Devicescape Software, Inc.
   6  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   7  * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
   8  * Copyright 2009, Johannes Berg <johannes@sipsolutions.net>
   9  * Copyright 2013-2014  Intel Mobile Communications GmbH
  10  * Copyright(c) 2016 Intel Deutschland GmbH
  11  *
  12  * This program is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License version 2 as
  14  * published by the Free Software Foundation.
  15  */
  16
  17 #include <linux/delay.h>
  18 #include <linux/slab.h>
  19 #include <linux/if_ether.h>
  20 #include <linux/skbuff.h>
  21 #include <linux/if_arp.h>
  22 #include <linux/etherdevice.h>
  23 #include <linux/rtnetlink.h>
  24 #include <net/mac80211.h>
  25
  26 #include "ieee80211_i.h"
  27 #include "driver-ops.h"
  28 #include "rate.h"
  29
  30 #define IEEE80211_SCAN_INTERVAL (2 * HZ)
  31 #define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ)
  32
  33 #define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ)
  34 #define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ)
  35 #define IEEE80211_IBSS_RSN_INACTIVITY_LIMIT (10 * HZ)
  36
  37 #define IEEE80211_IBSS_MAX_STA_ENTRIES 128
  38
  39 static struct beacon_data *
  40 ieee80211_ibss_build_presp(struct ieee80211_sub_if_data *sdata,
  41                            const int beacon_int, const u32 basic_rates,
  42                            const u16 capability, u64 tsf,
  43                            struct cfg80211_chan_def *chandef,
  44                            bool *have_higher_than_11mbit,
  45                            struct cfg80211_csa_settings *csa_settings)
  46 {
  47         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
  48         struct ieee80211_local *local = sdata->local;
  49         int rates_n = 0, i, ri;
  50         struct ieee80211_mgmt *mgmt;
  51         u8 *pos;
  52         struct ieee80211_supported_band *sband;
  53         u32 rate_flags, rates = 0, rates_added = 0;
  54         struct beacon_data *presp;
  55         int frame_len;
  56         int shift;
  57
  58         /* Build IBSS probe response */
  59         frame_len = sizeof(struct ieee80211_hdr_3addr) +
  60                     12 /* struct ieee80211_mgmt.u.beacon */ +
  61                     2 + IEEE80211_MAX_SSID_LEN /* max SSID */ +
  62                     2 + 8 /* max Supported Rates */ +
  63                     3 /* max DS params */ +
  64                     4 /* IBSS params */ +
  65                     5 /* Channel Switch Announcement */ +
  66                     2 + (IEEE80211_MAX_SUPP_RATES - 8) +
  67                     2 + sizeof(struct ieee80211_ht_cap) +
  68                     2 + sizeof(struct ieee80211_ht_operation) +
  69                     ifibss->ie_len;
  70         presp = kzalloc(sizeof(*presp) + frame_len, GFP_KERNEL);
  71         if (!presp)
  72                 return NULL;
  73
  74         presp->head = (void *)(presp + 1);
  75
  76         mgmt = (void *) presp->head;
  77         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
  78                                           IEEE80211_STYPE_PROBE_RESP);
  79         eth_broadcast_addr(mgmt->da);
  80         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
  81         memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN);
  82         mgmt->u.beacon.beacon_int = cpu_to_le16(beacon_int);
  83         mgmt->u.beacon.timestamp = cpu_to_le64(tsf);
  84         mgmt->u.beacon.capab_info = cpu_to_le16(capability);
  85
  86         pos = (u8 *)mgmt + offsetof(struct ieee80211_mgmt, u.beacon.variable);
  87
  88         *pos++ = WLAN_EID_SSID;
  89         *pos++ = ifibss->ssid_len;
  90         memcpy(pos, ifibss->ssid, ifibss->ssid_len);
  91         pos += ifibss->ssid_len;
  92
  93         sband = local->hw.wiphy->bands[chandef->chan->band];
  94         rate_flags = ieee80211_chandef_rate_flags(chandef);
  95         shift = ieee80211_chandef_get_shift(chandef);
  96         rates_n = 0;
  97         if (have_higher_than_11mbit)
  98                 *have_higher_than_11mbit = false;
  99
 100         for (i = 0; i < sband->n_bitrates; i++) {
 101                 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
 102                         continue;
 103                 if (sband->bitrates[i].bitrate > 110 &&
 104                     have_higher_than_11mbit)
 105                         *have_higher_than_11mbit = true;
 106
 107                 rates |= BIT(i);
 108                 rates_n++;
 109         }
 110
 111         *pos++ = WLAN_EID_SUPP_RATES;
 112         *pos++ = min_t(int, 8, rates_n);
 113         for (ri = 0; ri < sband->n_bitrates; ri++) {
 114                 int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate,
 115                                         5 * (1 << shift));
 116                 u8 basic = 0;
 117                 if (!(rates & BIT(ri)))
 118                         continue;
 119
 120                 if (basic_rates & BIT(ri))
 121                         basic = 0x80;
 122                 *pos++ = basic | (u8) rate;
 123                 if (++rates_added == 8) {
 124                         ri++; /* continue at next rate for EXT_SUPP_RATES */
 125                         break;
 126                 }
 127         }
 128
 129         if (sband->band == IEEE80211_BAND_2GHZ) {
 130                 *pos++ = WLAN_EID_DS_PARAMS;
 131                 *pos++ = 1;
 132                 *pos++ = ieee80211_frequency_to_channel(
 133                                 chandef->chan->center_freq);
 134         }
 135
 136         *pos++ = WLAN_EID_IBSS_PARAMS;
 137         *pos++ = 2;
 138         /* FIX: set ATIM window based on scan results */
 139         *pos++ = 0;
 140         *pos++ = 0;
 141
 142         if (csa_settings) {
 143                 *pos++ = WLAN_EID_CHANNEL_SWITCH;
 144                 *pos++ = 3;
 145                 *pos++ = csa_settings->block_tx ? 1 : 0;
 146                 *pos++ = ieee80211_frequency_to_channel(
 147                                 csa_settings->chandef.chan->center_freq);
 148                 presp->csa_counter_offsets[0] = (pos - presp->head);
 149                 *pos++ = csa_settings->count;
 150                 presp->csa_current_counter = csa_settings->count;
 151         }
 152
 153         /* put the remaining rates in WLAN_EID_EXT_SUPP_RATES */
 154         if (rates_n > 8) {
 155                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 156                 *pos++ = rates_n - 8;
 157                 for (; ri < sband->n_bitrates; ri++) {
 158                         int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate,
 159                                                 5 * (1 << shift));
 160                         u8 basic = 0;
 161                         if (!(rates & BIT(ri)))
 162                                 continue;
 163
 164                         if (basic_rates & BIT(ri))
 165                                 basic = 0x80;
 166                         *pos++ = basic | (u8) rate;
 167                 }
 168         }
 169
 170         if (ifibss->ie_len) {
 171                 memcpy(pos, ifibss->ie, ifibss->ie_len);
 172                 pos += ifibss->ie_len;
 173         }
 174
 175         /* add HT capability and information IEs */
 176         if (chandef->width != NL80211_CHAN_WIDTH_20_NOHT &&
 177             chandef->width != NL80211_CHAN_WIDTH_5 &&
 178             chandef->width != NL80211_CHAN_WIDTH_10 &&
 179             sband->ht_cap.ht_supported) {
 180                 struct ieee80211_sta_ht_cap ht_cap;
 181
 182                 memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
 183                 ieee80211_apply_htcap_overrides(sdata, &ht_cap);
 184
 185                 pos = ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap);
 186                 /*
 187                  * Note: According to 802.11n-2009 9.13.3.1, HT Protection
 188                  * field and RIFS Mode are reserved in IBSS mode, therefore
 189                  * keep them at 0
 190                  */
 191                 pos = ieee80211_ie_build_ht_oper(pos, &sband->ht_cap,
 192                                                  chandef, 0, false);
 193
 194                 /* add VHT capability and information IEs */
 195                 if (chandef->width != NL80211_CHAN_WIDTH_20 &&
 196                     chandef->width != NL80211_CHAN_WIDTH_40 &&
 197                     sband->vht_cap.vht_supported) {
 198                         pos = ieee80211_ie_build_vht_cap(pos, &sband->vht_cap,
 199                                                          sband->vht_cap.cap);
 200                         pos = ieee80211_ie_build_vht_oper(pos, &sband->vht_cap,
 201                                                           chandef);
 202                 }
 203         }
 204
 205         if (local->hw.queues >= IEEE80211_NUM_ACS)
 206                 pos = ieee80211_add_wmm_info_ie(pos, 0); /* U-APSD not in use */
 207
 208         presp->head_len = pos - presp->head;
 209         if (WARN_ON(presp->head_len > frame_len))
 210                 goto error;
 211
 212         return presp;
 213 error:
 214         kfree(presp);
 215         return NULL;
 216 }
 217
 218 static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
 219                                       const u8 *bssid, const int beacon_int,
 220                                       struct cfg80211_chan_def *req_chandef,
 221                                       const u32 basic_rates,
 222                                       const u16 capability, u64 tsf,
 223                                       bool creator)
 224 {
 225         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 226         struct ieee80211_local *local = sdata->local;
 227         struct ieee80211_mgmt *mgmt;
 228         struct cfg80211_bss *bss;
 229         u32 bss_change;
 230         struct cfg80211_chan_def chandef;
 231         struct ieee80211_channel *chan;
 232         struct beacon_data *presp;
 233         struct cfg80211_inform_bss bss_meta = {};
 234         bool have_higher_than_11mbit;
 235         bool radar_required;
 236         int err;
 237
 238         sdata_assert_lock(sdata);
 239
 240         /* Reset own TSF to allow time synchronization work. */
 241         drv_reset_tsf(local, sdata);
 242
 243         if (!ether_addr_equal(ifibss->bssid, bssid))
 244                 sta_info_flush(sdata);
 245
 246         /* if merging, indicate to driver that we leave the old IBSS */
 247         if (sdata->vif.bss_conf.ibss_joined) {
 248                 sdata->vif.bss_conf.ibss_joined = false;
 249                 sdata->vif.bss_conf.ibss_creator = false;
 250                 sdata->vif.bss_conf.enable_beacon = false;
 251                 netif_carrier_off(sdata->dev);
 252                 ieee80211_bss_info_change_notify(sdata,
 253                                                  BSS_CHANGED_IBSS |
 254                                                  BSS_CHANGED_BEACON_ENABLED);
 255                 drv_leave_ibss(local, sdata);
 256         }
 257
 258         presp = rcu_dereference_protected(ifibss->presp,
 259                                           lockdep_is_held(&sdata->wdev.mtx));
 260         RCU_INIT_POINTER(ifibss->presp, NULL);
 261         if (presp)
 262                 kfree_rcu(presp, rcu_head);
 263
 264         /* make a copy of the chandef, it could be modified below. */
 265         chandef = *req_chandef;
 266         chan = chandef.chan;
 267         if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef,
 268                                      NL80211_IFTYPE_ADHOC)) {
 269                 if (chandef.width == NL80211_CHAN_WIDTH_5 ||
 270                     chandef.width == NL80211_CHAN_WIDTH_10 ||
 271                     chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
 272                     chandef.width == NL80211_CHAN_WIDTH_20) {
 273                         sdata_info(sdata,
 274                                    "Failed to join IBSS, beacons forbidden\n");
 275                         return;
 276                 }
 277                 chandef.width = NL80211_CHAN_WIDTH_20;
 278                 chandef.center_freq1 = chan->center_freq;
 279                 /* check again for downgraded chandef */
 280                 if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef,
 281                                              NL80211_IFTYPE_ADHOC)) {
 282                         sdata_info(sdata,
 283                                    "Failed to join IBSS, beacons forbidden\n");
 284                         return;
 285                 }
 286         }
 287
 288         err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
 289                                             &chandef, NL80211_IFTYPE_ADHOC);
 290         if (err < 0) {
 291                 sdata_info(sdata,
 292                            "Failed to join IBSS, invalid chandef\n");
 293                 return;
 294         }
 295         if (err > 0 && !ifibss->userspace_handles_dfs) {
 296                 sdata_info(sdata,
 297                            "Failed to join IBSS, DFS channel without control program\n");
 298                 return;
 299         }
 300
 301         radar_required = err;
 302
 303         mutex_lock(&local->mtx);
 304         if (ieee80211_vif_use_channel(sdata, &chandef,
 305                                       ifibss->fixed_channel ?
 306                                         IEEE80211_CHANCTX_SHARED :
 307                                         IEEE80211_CHANCTX_EXCLUSIVE)) {
 308                 sdata_info(sdata, "Failed to join IBSS, no channel context\n");
 309                 mutex_unlock(&local->mtx);
 310                 return;
 311         }
 312         sdata->radar_required = radar_required;
 313         mutex_unlock(&local->mtx);
 314
 315         memcpy(ifibss->bssid, bssid, ETH_ALEN);
 316
 317         presp = ieee80211_ibss_build_presp(sdata, beacon_int, basic_rates,
 318                                            capability, tsf, &chandef,
 319                                            &have_higher_than_11mbit, NULL);
 320         if (!presp)
 321                 return;
 322
 323         rcu_assign_pointer(ifibss->presp, presp);
 324         mgmt = (void *)presp->head;
 325
 326         sdata->vif.bss_conf.enable_beacon = true;
 327         sdata->vif.bss_conf.beacon_int = beacon_int;
 328         sdata->vif.bss_conf.basic_rates = basic_rates;
 329         sdata->vif.bss_conf.ssid_len = ifibss->ssid_len;
 330         memcpy(sdata->vif.bss_conf.ssid, ifibss->ssid, ifibss->ssid_len);
 331         bss_change = BSS_CHANGED_BEACON_INT;
 332         bss_change |= ieee80211_reset_erp_info(sdata);
 333         bss_change |= BSS_CHANGED_BSSID;
 334         bss_change |= BSS_CHANGED_BEACON;
 335         bss_change |= BSS_CHANGED_BEACON_ENABLED;
 336         bss_change |= BSS_CHANGED_BASIC_RATES;
 337         bss_change |= BSS_CHANGED_HT;
 338         bss_change |= BSS_CHANGED_IBSS;
 339         bss_change |= BSS_CHANGED_SSID;
 340
 341         /*
 342          * In 5 GHz/802.11a, we can always use short slot time.
 343          * (IEEE 802.11-2012 18.3.8.7)
 344          *
 345          * In 2.4GHz, we must always use long slots in IBSS for compatibility
 346          * reasons.
 347          * (IEEE 802.11-2012 19.4.5)
 348          *
 349          * HT follows these specifications (IEEE 802.11-2012 20.3.18)
 350          */
 351         sdata->vif.bss_conf.use_short_slot = chan->band == IEEE80211_BAND_5GHZ;
 352         bss_change |= BSS_CHANGED_ERP_SLOT;
 353
 354         /* cf. IEEE 802.11 9.2.12 */
 355         if (chan->band == IEEE80211_BAND_2GHZ && have_higher_than_11mbit)
 356                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
 357         else
 358                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
 359
 360         ieee80211_set_wmm_default(sdata, true, false);
 361
 362         sdata->vif.bss_conf.ibss_joined = true;
 363         sdata->vif.bss_conf.ibss_creator = creator;
 364
 365         err = drv_join_ibss(local, sdata);
 366         if (err) {
 367                 sdata->vif.bss_conf.ibss_joined = false;
 368                 sdata->vif.bss_conf.ibss_creator = false;
 369                 sdata->vif.bss_conf.enable_beacon = false;
 370                 sdata->vif.bss_conf.ssid_len = 0;
 371                 RCU_INIT_POINTER(ifibss->presp, NULL);
 372                 kfree_rcu(presp, rcu_head);
 373                 mutex_lock(&local->mtx);
 374                 ieee80211_vif_release_channel(sdata);
 375                 mutex_unlock(&local->mtx);
 376                 sdata_info(sdata, "Failed to join IBSS, driver failure: %d\n",
 377                            err);
 378                 return;
 379         }
 380
 381         ieee80211_bss_info_change_notify(sdata, bss_change);
 382
 383         ifibss->state = IEEE80211_IBSS_MLME_JOINED;
 384         mod_timer(&ifibss->timer,
 385                   round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
 386
 387         bss_meta.chan = chan;
 388         bss_meta.scan_width = cfg80211_chandef_to_scan_width(&chandef);
 389         bss = cfg80211_inform_bss_frame_data(local->hw.wiphy, &bss_meta, mgmt,
 390                                              presp->head_len, GFP_KERNEL);
 391
 392         cfg80211_put_bss(local->hw.wiphy, bss);
 393         netif_carrier_on(sdata->dev);
 394         cfg80211_ibss_joined(sdata->dev, ifibss->bssid, chan, GFP_KERNEL);
 395 }
 396
 397 static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
 398                                     struct ieee80211_bss *bss)
 399 {
 400         struct cfg80211_bss *cbss =
 401                 container_of((void *)bss, struct cfg80211_bss, priv);
 402         struct ieee80211_supported_band *sband;
 403         struct cfg80211_chan_def chandef;
 404         u32 basic_rates;
 405         int i, j;
 406         u16 beacon_int = cbss->beacon_interval;
 407         const struct cfg80211_bss_ies *ies;
 408         enum nl80211_channel_type chan_type;
 409         u64 tsf;
 410         u32 rate_flags;
 411         int shift;
 412
 413         sdata_assert_lock(sdata);
 414
 415         if (beacon_int < 10)
 416                 beacon_int = 10;
 417
 418         switch (sdata->u.ibss.chandef.width) {
 419         case NL80211_CHAN_WIDTH_20_NOHT:
 420         case NL80211_CHAN_WIDTH_20:
 421         case NL80211_CHAN_WIDTH_40:
 422                 chan_type = cfg80211_get_chandef_type(&sdata->u.ibss.chandef);
 423                 cfg80211_chandef_create(&chandef, cbss->channel, chan_type);
 424                 break;
 425         case NL80211_CHAN_WIDTH_5:
 426         case NL80211_CHAN_WIDTH_10:
 427                 cfg80211_chandef_create(&chandef, cbss->channel,
 428                                         NL80211_CHAN_WIDTH_20_NOHT);
 429                 chandef.width = sdata->u.ibss.chandef.width;
 430                 break;
 431         case NL80211_CHAN_WIDTH_80:
 432         case NL80211_CHAN_WIDTH_80P80:
 433         case NL80211_CHAN_WIDTH_160:
 434                 chandef = sdata->u.ibss.chandef;
 435                 chandef.chan = cbss->channel;
 436                 break;
 437         default:
 438                 /* fall back to 20 MHz for unsupported modes */
 439                 cfg80211_chandef_create(&chandef, cbss->channel,
 440                                         NL80211_CHAN_WIDTH_20_NOHT);
 441                 break;
 442         }
 443
 444         sband = sdata->local->hw.wiphy->bands[cbss->channel->band];
 445         rate_flags = ieee80211_chandef_rate_flags(&sdata->u.ibss.chandef);
 446         shift = ieee80211_vif_get_shift(&sdata->vif);
 447
 448         basic_rates = 0;
 449
 450         for (i = 0; i < bss->supp_rates_len; i++) {
 451                 int rate = bss->supp_rates[i] & 0x7f;
 452                 bool is_basic = !!(bss->supp_rates[i] & 0x80);
 453
 454                 for (j = 0; j < sband->n_bitrates; j++) {
 455                         int brate;
 456                         if ((rate_flags & sband->bitrates[j].flags)
 457                             != rate_flags)
 458                                 continue;
 459
 460                         brate = DIV_ROUND_UP(sband->bitrates[j].bitrate,
 461                                              5 * (1 << shift));
 462                         if (brate == rate) {
 463                                 if (is_basic)
 464                                         basic_rates |= BIT(j);
 465                                 break;
 466                         }
 467                 }
 468         }
 469
 470         rcu_read_lock();
 471         ies = rcu_dereference(cbss->ies);
 472         tsf = ies->tsf;
 473         rcu_read_unlock();
 474
 475         __ieee80211_sta_join_ibss(sdata, cbss->bssid,
 476                                   beacon_int,
 477                                   &chandef,
 478                                   basic_rates,
 479                                   cbss->capability,
 480                                   tsf, false);
 481 }
 482
 483 int ieee80211_ibss_csa_beacon(struct ieee80211_sub_if_data *sdata,
 484                               struct cfg80211_csa_settings *csa_settings)
 485 {
 486         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 487         struct beacon_data *presp, *old_presp;
 488         struct cfg80211_bss *cbss;
 489         const struct cfg80211_bss_ies *ies;
 490         u16 capability = 0;
 491         u64 tsf;
 492         int ret = 0;
 493
 494         sdata_assert_lock(sdata);
 495
 496         if (ifibss->privacy)
 497                 capability = WLAN_CAPABILITY_PRIVACY;
 498
 499         cbss = cfg80211_get_bss(sdata->local->hw.wiphy, ifibss->chandef.chan,
 500                                 ifibss->bssid, ifibss->ssid,
 501                                 ifibss->ssid_len, IEEE80211_BSS_TYPE_IBSS,
 502                                 IEEE80211_PRIVACY(ifibss->privacy));
 503
 504         if (WARN_ON(!cbss)) {
 505                 ret = -EINVAL;
 506                 goto out;
 507         }
 508
 509         rcu_read_lock();
 510         ies = rcu_dereference(cbss->ies);
 511         tsf = ies->tsf;
 512         rcu_read_unlock();
 513         cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
 514
 515         old_presp = rcu_dereference_protected(ifibss->presp,
 516                                           lockdep_is_held(&sdata->wdev.mtx));
 517
 518         presp = ieee80211_ibss_build_presp(sdata,
 519                                            sdata->vif.bss_conf.beacon_int,
 520                                            sdata->vif.bss_conf.basic_rates,
 521                                            capability, tsf, &ifibss->chandef,
 522                                            NULL, csa_settings);
 523         if (!presp) {
 524                 ret = -ENOMEM;
 525                 goto out;
 526         }
 527
 528         rcu_assign_pointer(ifibss->presp, presp);
 529         if (old_presp)
 530                 kfree_rcu(old_presp, rcu_head);
 531
 532         return BSS_CHANGED_BEACON;
 533  out:
 534         return ret;
 535 }
 536
 537 int ieee80211_ibss_finish_csa(struct ieee80211_sub_if_data *sdata)
 538 {
 539         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 540         struct cfg80211_bss *cbss;
 541         int err, changed = 0;
 542
 543         sdata_assert_lock(sdata);
 544
 545         /* update cfg80211 bss information with the new channel */
 546         if (!is_zero_ether_addr(ifibss->bssid)) {
 547                 cbss = cfg80211_get_bss(sdata->local->hw.wiphy,
 548                                         ifibss->chandef.chan,
 549                                         ifibss->bssid, ifibss->ssid,
 550                                         ifibss->ssid_len,
 551                                         IEEE80211_BSS_TYPE_IBSS,
 552                                         IEEE80211_PRIVACY(ifibss->privacy));
 553                 /* XXX: should not really modify cfg80211 data */
 554                 if (cbss) {
 555                         cbss->channel = sdata->csa_chandef.chan;
 556                         cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
 557                 }
 558         }
 559
 560         ifibss->chandef = sdata->csa_chandef;
 561
 562         /* generate the beacon */
 563         err = ieee80211_ibss_csa_beacon(sdata, NULL);
 564         if (err < 0)
 565                 return err;
 566
 567         changed |= err;
 568
 569         return changed;
 570 }
 571
 572 void ieee80211_ibss_stop(struct ieee80211_sub_if_data *sdata)
 573 {
 574         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 575
 576         cancel_work_sync(&ifibss->csa_connection_drop_work);
 577 }
 578
 579 static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta)
 580         __acquires(RCU)
 581 {
 582         struct ieee80211_sub_if_data *sdata = sta->sdata;
 583         u8 addr[ETH_ALEN];
 584
 585         memcpy(addr, sta->sta.addr, ETH_ALEN);
 586
 587         ibss_dbg(sdata, "Adding new IBSS station %pM\n", addr);
 588
 589         sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
 590         sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
 591         /* authorize the station only if the network is not RSN protected. If
 592          * not wait for the userspace to authorize it */
 593         if (!sta->sdata->u.ibss.control_port)
 594                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
 595
 596         rate_control_rate_init(sta);
 597
 598         /* If it fails, maybe we raced another insertion? */
 599         if (sta_info_insert_rcu(sta))
 600                 return sta_info_get(sdata, addr);
 601         return sta;
 602 }
 603
 604 static struct sta_info *
 605 ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, const u8 *bssid,
 606                        const u8 *addr, u32 supp_rates)
 607         __acquires(RCU)
 608 {
 609         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 610         struct ieee80211_local *local = sdata->local;
 611         struct sta_info *sta;
 612         struct ieee80211_chanctx_conf *chanctx_conf;
 613         struct ieee80211_supported_band *sband;
 614         enum nl80211_bss_scan_width scan_width;
 615         int band;
 616
 617         /*
 618          * XXX: Consider removing the least recently used entry and
 619          *      allow new one to be added.
 620          */
 621         if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
 622                 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
 623                                     sdata->name, addr);
 624                 rcu_read_lock();
 625                 return NULL;
 626         }
 627
 628         if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) {
 629                 rcu_read_lock();
 630                 return NULL;
 631         }
 632
 633         if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) {
 634                 rcu_read_lock();
 635                 return NULL;
 636         }
 637
 638         rcu_read_lock();
 639         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 640         if (WARN_ON_ONCE(!chanctx_conf))
 641                 return NULL;
 642         band = chanctx_conf->def.chan->band;
 643         scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
 644         rcu_read_unlock();
 645
 646         sta = sta_info_alloc(sdata, addr, GFP_KERNEL);
 647         if (!sta) {
 648                 rcu_read_lock();
 649                 return NULL;
 650         }
 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                 cfg80211_chandef_create(&chandef, channel, NL80211_CHAN_NO_HT);
1053                 ieee80211_chandef_ht_oper(elems->ht_operation, &chandef);
1054
1055                 memcpy(&htcap_ie, elems->ht_cap_elem, sizeof(htcap_ie));
1056                 rates_updated |= ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
1057                                                                    &htcap_ie,
1058                                                                    sta);
1059
1060                 if (elems->vht_operation && elems->vht_cap_elem &&
1061                     sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20 &&
1062                     sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_40) {
1063                         /* we both use VHT */
1064                         struct ieee80211_vht_cap cap_ie;
1065                         struct ieee80211_sta_vht_cap cap = sta->sta.vht_cap;
1066
1067                         ieee80211_chandef_vht_oper(elems->vht_operation,
1068                                                    &chandef);
1069                         memcpy(&cap_ie, elems->vht_cap_elem, sizeof(cap_ie));
1070                         ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
1071                                                             &cap_ie, sta);
1072                         if (memcmp(&cap, &sta->sta.vht_cap, sizeof(cap)))
1073                                 rates_updated |= true;
1074                 }
1075
1076                 if (bw != sta->sta.bandwidth)
1077                         rates_updated |= true;
1078
1079                 if (!cfg80211_chandef_compatible(&sdata->u.ibss.chandef,
1080                                                  &chandef))
1081                         WARN_ON_ONCE(1);
1082         }
1083
1084         if (sta && rates_updated) {
1085                 u32 changed = IEEE80211_RC_SUPP_RATES_CHANGED;
1086                 u8 rx_nss = sta->sta.rx_nss;
1087
1088                 /* Force rx_nss recalculation */
1089                 sta->sta.rx_nss = 0;
1090                 rate_control_rate_init(sta);
1091                 if (sta->sta.rx_nss != rx_nss)
1092                         changed |= IEEE80211_RC_NSS_CHANGED;
1093
1094                 drv_sta_rc_update(local, sdata, &sta->sta, changed);
1095         }
1096
1097         rcu_read_unlock();
1098 }
1099
1100 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1101                                   struct ieee80211_mgmt *mgmt, size_t len,
1102                                   struct ieee80211_rx_status *rx_status,
1103                                   struct ieee802_11_elems *elems)
1104 {
1105         struct ieee80211_local *local = sdata->local;
1106         struct cfg80211_bss *cbss;
1107         struct ieee80211_bss *bss;
1108         struct ieee80211_channel *channel;
1109         u64 beacon_timestamp, rx_timestamp;
1110         u32 supp_rates = 0;
1111         enum ieee80211_band band = rx_status->band;
1112
1113         channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
1114         if (!channel)
1115                 return;
1116
1117         ieee80211_update_sta_info(sdata, mgmt, len, rx_status, elems, channel);
1118
1119         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1120                                         channel);
1121         if (!bss)
1122                 return;
1123
1124         cbss = container_of((void *)bss, struct cfg80211_bss, priv);
1125
1126         /* same for beacon and probe response */
1127         beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp);
1128
1129         /* check if we need to merge IBSS */
1130
1131         /* not an IBSS */
1132         if (!(cbss->capability & WLAN_CAPABILITY_IBSS))
1133                 goto put_bss;
1134
1135         /* different channel */
1136         if (sdata->u.ibss.fixed_channel &&
1137             sdata->u.ibss.chandef.chan != cbss->channel)
1138                 goto put_bss;
1139
1140         /* different SSID */
1141         if (elems->ssid_len != sdata->u.ibss.ssid_len ||
1142             memcmp(elems->ssid, sdata->u.ibss.ssid,
1143                                 sdata->u.ibss.ssid_len))
1144                 goto put_bss;
1145
1146         /* process channel switch */
1147         if (sdata->vif.csa_active ||
1148             ieee80211_ibss_process_chanswitch(sdata, elems, true))
1149                 goto put_bss;
1150
1151         /* same BSSID */
1152         if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid))
1153                 goto put_bss;
1154
1155         /* we use a fixed BSSID */
1156         if (sdata->u.ibss.fixed_bssid)
1157                 goto put_bss;
1158
1159         if (ieee80211_have_rx_timestamp(rx_status)) {
1160                 /* time when timestamp field was received */
1161                 rx_timestamp =
1162                         ieee80211_calculate_rx_timestamp(local, rx_status,
1163                                                          len + FCS_LEN, 24);
1164         } else {
1165                 /*
1166                  * second best option: get current TSF
1167                  * (will return -1 if not supported)
1168                  */
1169                 rx_timestamp = drv_get_tsf(local, sdata);
1170         }
1171
1172         ibss_dbg(sdata,
1173                  "RX beacon SA=%pM BSSID=%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
1174                  mgmt->sa, mgmt->bssid,
1175                  (unsigned long long)rx_timestamp,
1176                  (unsigned long long)beacon_timestamp,
1177                  (unsigned long long)(rx_timestamp - beacon_timestamp),
1178                  jiffies);
1179
1180         if (beacon_timestamp > rx_timestamp) {
1181                 ibss_dbg(sdata,
1182                          "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n",
1183                          mgmt->bssid);
1184                 ieee80211_sta_join_ibss(sdata, bss);
1185                 supp_rates = ieee80211_sta_get_rates(sdata, elems, band, NULL);
1186                 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa,
1187                                        supp_rates);
1188                 rcu_read_unlock();
1189         }
1190
1191  put_bss:
1192         ieee80211_rx_bss_put(local, bss);
1193 }
1194
1195 void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata,
1196                               const u8 *bssid, const u8 *addr,
1197                               u32 supp_rates)
1198 {
1199         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1200         struct ieee80211_local *local = sdata->local;
1201         struct sta_info *sta;
1202         struct ieee80211_chanctx_conf *chanctx_conf;
1203         struct ieee80211_supported_band *sband;
1204         enum nl80211_bss_scan_width scan_width;
1205         int band;
1206
1207         /*
1208          * XXX: Consider removing the least recently used entry and
1209          *      allow new one to be added.
1210          */
1211         if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
1212                 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
1213                                     sdata->name, addr);
1214                 return;
1215         }
1216
1217         if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH)
1218                 return;
1219
1220         if (!ether_addr_equal(bssid, sdata->u.ibss.bssid))
1221                 return;
1222
1223         rcu_read_lock();
1224         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1225         if (WARN_ON_ONCE(!chanctx_conf)) {
1226                 rcu_read_unlock();
1227                 return;
1228         }
1229         band = chanctx_conf->def.chan->band;
1230         scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
1231         rcu_read_unlock();
1232
1233         sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
1234         if (!sta)
1235                 return;
1236
1237         /* make sure mandatory rates are always added */
1238         sband = local->hw.wiphy->bands[band];
1239         sta->sta.supp_rates[band] = supp_rates |
1240                         ieee80211_mandatory_rates(sband, scan_width);
1241
1242         spin_lock(&ifibss->incomplete_lock);
1243         list_add(&sta->list, &ifibss->incomplete_stations);
1244         spin_unlock(&ifibss->incomplete_lock);
1245         ieee80211_queue_work(&local->hw, &sdata->work);
1246 }
1247
1248 static void ieee80211_ibss_sta_expire(struct ieee80211_sub_if_data *sdata)
1249 {
1250         struct ieee80211_local *local = sdata->local;
1251         struct sta_info *sta, *tmp;
1252         unsigned long exp_time = IEEE80211_IBSS_INACTIVITY_LIMIT;
1253         unsigned long exp_rsn = IEEE80211_IBSS_RSN_INACTIVITY_LIMIT;
1254
1255         mutex_lock(&local->sta_mtx);
1256
1257         list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
1258                 if (sdata != sta->sdata)
1259                         continue;
1260
1261                 if (time_after(jiffies, sta->rx_stats.last_rx + exp_time) ||
1262                     (time_after(jiffies, sta->rx_stats.last_rx + exp_rsn) &&
1263                      sta->sta_state != IEEE80211_STA_AUTHORIZED)) {
1264                         sta_dbg(sta->sdata, "expiring inactive %sSTA %pM\n",
1265                                 sta->sta_state != IEEE80211_STA_AUTHORIZED ?
1266                                 "not authorized " : "", sta->sta.addr);
1267
1268                         WARN_ON(__sta_info_destroy(sta));
1269                 }
1270         }
1271
1272         mutex_unlock(&local->sta_mtx);
1273 }
1274
1275 /*
1276  * This function is called with state == IEEE80211_IBSS_MLME_JOINED
1277  */
1278
1279 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
1280 {
1281         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1282         enum nl80211_bss_scan_width scan_width;
1283
1284         sdata_assert_lock(sdata);
1285
1286         mod_timer(&ifibss->timer,
1287                   round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
1288
1289         ieee80211_ibss_sta_expire(sdata);
1290
1291         if (time_before(jiffies, ifibss->last_scan_completed +
1292                        IEEE80211_IBSS_MERGE_INTERVAL))
1293                 return;
1294
1295         if (ieee80211_sta_active_ibss(sdata))
1296                 return;
1297
1298         if (ifibss->fixed_channel)
1299                 return;
1300
1301         sdata_info(sdata,
1302                    "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n");
1303
1304         scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
1305         ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len,
1306                                     NULL, 0, scan_width);
1307 }
1308
1309 static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
1310 {
1311         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1312         u8 bssid[ETH_ALEN];
1313         u16 capability;
1314         int i;
1315
1316         sdata_assert_lock(sdata);
1317
1318         if (ifibss->fixed_bssid) {
1319                 memcpy(bssid, ifibss->bssid, ETH_ALEN);
1320         } else {
1321                 /* Generate random, not broadcast, locally administered BSSID. Mix in
1322                  * own MAC address to make sure that devices that do not have proper
1323                  * random number generator get different BSSID. */
1324                 get_random_bytes(bssid, ETH_ALEN);
1325                 for (i = 0; i < ETH_ALEN; i++)
1326                         bssid[i] ^= sdata->vif.addr[i];
1327                 bssid[0] &= ~0x01;
1328                 bssid[0] |= 0x02;
1329         }
1330
1331         sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid);
1332
1333         capability = WLAN_CAPABILITY_IBSS;
1334
1335         if (ifibss->privacy)
1336                 capability |= WLAN_CAPABILITY_PRIVACY;
1337
1338         __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int,
1339                                   &ifibss->chandef, ifibss->basic_rates,
1340                                   capability, 0, true);
1341 }
1342
1343 static unsigned ibss_setup_channels(struct wiphy *wiphy,
1344                                     struct ieee80211_channel **channels,
1345                                     unsigned int channels_max,
1346                                     u32 center_freq, u32 width)
1347 {
1348         struct ieee80211_channel *chan = NULL;
1349         unsigned int n_chan = 0;
1350         u32 start_freq, end_freq, freq;
1351
1352         if (width <= 20) {
1353                 start_freq = center_freq;
1354                 end_freq = center_freq;
1355         } else {
1356                 start_freq = center_freq - width / 2 + 10;
1357                 end_freq = center_freq + width / 2 - 10;
1358         }
1359
1360         for (freq = start_freq; freq <= end_freq; freq += 20) {
1361                 chan = ieee80211_get_channel(wiphy, freq);
1362                 if (!chan)
1363                         continue;
1364                 if (n_chan >= channels_max)
1365                         return n_chan;
1366
1367                 channels[n_chan] = chan;
1368                 n_chan++;
1369         }
1370
1371         return n_chan;
1372 }
1373
1374 static unsigned int
1375 ieee80211_ibss_setup_scan_channels(struct wiphy *wiphy,
1376                                    const struct cfg80211_chan_def *chandef,
1377                                    struct ieee80211_channel **channels,
1378                                    unsigned int channels_max)
1379 {
1380         unsigned int n_chan = 0;
1381         u32 width, cf1, cf2 = 0;
1382
1383         switch (chandef->width) {
1384         case NL80211_CHAN_WIDTH_40:
1385                 width = 40;
1386                 break;
1387         case NL80211_CHAN_WIDTH_80P80:
1388                 cf2 = chandef->center_freq2;
1389                 /* fall through */
1390         case NL80211_CHAN_WIDTH_80:
1391                 width = 80;
1392                 break;
1393         case NL80211_CHAN_WIDTH_160:
1394                 width = 160;
1395                 break;
1396         default:
1397                 width = 20;
1398                 break;
1399         }
1400
1401         cf1 = chandef->center_freq1;
1402
1403         n_chan = ibss_setup_channels(wiphy, channels, channels_max, cf1, width);
1404
1405         if (cf2)
1406                 n_chan += ibss_setup_channels(wiphy, &channels[n_chan],
1407                                               channels_max - n_chan, cf2,
1408                                               width);
1409
1410         return n_chan;
1411 }
1412
1413 /*
1414  * This function is called with state == IEEE80211_IBSS_MLME_SEARCH
1415  */
1416
1417 static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
1418 {
1419         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1420         struct ieee80211_local *local = sdata->local;
1421         struct cfg80211_bss *cbss;
1422         struct ieee80211_channel *chan = NULL;
1423         const u8 *bssid = NULL;
1424         enum nl80211_bss_scan_width scan_width;
1425         int active_ibss;
1426
1427         sdata_assert_lock(sdata);
1428
1429         active_ibss = ieee80211_sta_active_ibss(sdata);
1430         ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss);
1431
1432         if (active_ibss)
1433                 return;
1434
1435         if (ifibss->fixed_bssid)
1436                 bssid = ifibss->bssid;
1437         if (ifibss->fixed_channel)
1438                 chan = ifibss->chandef.chan;
1439         if (!is_zero_ether_addr(ifibss->bssid))
1440                 bssid = ifibss->bssid;
1441         cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid,
1442                                 ifibss->ssid, ifibss->ssid_len,
1443                                 IEEE80211_BSS_TYPE_IBSS,
1444                                 IEEE80211_PRIVACY(ifibss->privacy));
1445
1446         if (cbss) {
1447                 struct ieee80211_bss *bss;
1448
1449                 bss = (void *)cbss->priv;
1450                 ibss_dbg(sdata,
1451                          "sta_find_ibss: selected %pM current %pM\n",
1452                          cbss->bssid, ifibss->bssid);
1453                 sdata_info(sdata,
1454                            "Selected IBSS BSSID %pM based on configured SSID\n",
1455                            cbss->bssid);
1456
1457                 ieee80211_sta_join_ibss(sdata, bss);
1458                 ieee80211_rx_bss_put(local, bss);
1459                 return;
1460         }
1461
1462         /* if a fixed bssid and a fixed freq have been provided create the IBSS
1463          * directly and do not waste time scanning
1464          */
1465         if (ifibss->fixed_bssid && ifibss->fixed_channel) {
1466                 sdata_info(sdata, "Created IBSS using preconfigured BSSID %pM\n",
1467                            bssid);
1468                 ieee80211_sta_create_ibss(sdata);
1469                 return;
1470         }
1471
1472
1473         ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n");
1474
1475         /* Selected IBSS not found in current scan results - try to scan */
1476         if (time_after(jiffies, ifibss->last_scan_completed +
1477                                         IEEE80211_SCAN_INTERVAL)) {
1478                 struct ieee80211_channel *channels[8];
1479                 unsigned int num;
1480
1481                 sdata_info(sdata, "Trigger new scan to find an IBSS to join\n");
1482
1483                 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
1484
1485                 if (ifibss->fixed_channel) {
1486                         num = ieee80211_ibss_setup_scan_channels(local->hw.wiphy,
1487                                                                  &ifibss->chandef,
1488                                                                  channels,
1489                                                                  ARRAY_SIZE(channels));
1490                         ieee80211_request_ibss_scan(sdata, ifibss->ssid,
1491                                                     ifibss->ssid_len, channels,
1492                                                     num, scan_width);
1493                 } else {
1494                         ieee80211_request_ibss_scan(sdata, ifibss->ssid,
1495                                                     ifibss->ssid_len, NULL,
1496                                                     0, scan_width);
1497                 }
1498         } else {
1499                 int interval = IEEE80211_SCAN_INTERVAL;
1500
1501                 if (time_after(jiffies, ifibss->ibss_join_req +
1502                                IEEE80211_IBSS_JOIN_TIMEOUT))
1503                         ieee80211_sta_create_ibss(sdata);
1504
1505                 mod_timer(&ifibss->timer,
1506                           round_jiffies(jiffies + interval));
1507         }
1508 }
1509
1510 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
1511                                         struct sk_buff *req)
1512 {
1513         struct ieee80211_mgmt *mgmt = (void *)req->data;
1514         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1515         struct ieee80211_local *local = sdata->local;
1516         int tx_last_beacon, len = req->len;
1517         struct sk_buff *skb;
1518         struct beacon_data *presp;
1519         u8 *pos, *end;
1520
1521         sdata_assert_lock(sdata);
1522
1523         presp = rcu_dereference_protected(ifibss->presp,
1524                                           lockdep_is_held(&sdata->wdev.mtx));
1525
1526         if (ifibss->state != IEEE80211_IBSS_MLME_JOINED ||
1527             len < 24 + 2 || !presp)
1528                 return;
1529
1530         tx_last_beacon = drv_tx_last_beacon(local);
1531
1532         ibss_dbg(sdata,
1533                  "RX ProbeReq SA=%pM DA=%pM BSSID=%pM (tx_last_beacon=%d)\n",
1534                  mgmt->sa, mgmt->da, mgmt->bssid, tx_last_beacon);
1535
1536         if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da))
1537                 return;
1538
1539         if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) &&
1540             !is_broadcast_ether_addr(mgmt->bssid))
1541                 return;
1542
1543         end = ((u8 *) mgmt) + len;
1544         pos = mgmt->u.probe_req.variable;
1545         if (pos[0] != WLAN_EID_SSID ||
1546             pos + 2 + pos[1] > end) {
1547                 ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n",
1548                          mgmt->sa);
1549                 return;
1550         }
1551         if (pos[1] != 0 &&
1552             (pos[1] != ifibss->ssid_len ||
1553              memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) {
1554                 /* Ignore ProbeReq for foreign SSID */
1555                 return;
1556         }
1557
1558         /* Reply with ProbeResp */
1559         skb = dev_alloc_skb(local->tx_headroom + presp->head_len);
1560         if (!skb)
1561                 return;
1562
1563         skb_reserve(skb, local->tx_headroom);
1564         memcpy(skb_put(skb, presp->head_len), presp->head, presp->head_len);
1565
1566         memcpy(((struct ieee80211_mgmt *) skb->data)->da, mgmt->sa, ETH_ALEN);
1567         ibss_dbg(sdata, "Sending ProbeResp to %pM\n", mgmt->sa);
1568         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1569
1570         /* avoid excessive retries for probe request to wildcard SSIDs */
1571         if (pos[1] == 0)
1572                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_NO_ACK;
1573
1574         ieee80211_tx_skb(sdata, skb);
1575 }
1576
1577 static
1578 void ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data *sdata,
1579                                     struct ieee80211_mgmt *mgmt, size_t len,
1580                                     struct ieee80211_rx_status *rx_status)
1581 {
1582         size_t baselen;
1583         struct ieee802_11_elems elems;
1584
1585         BUILD_BUG_ON(offsetof(typeof(mgmt->u.probe_resp), variable) !=
1586                      offsetof(typeof(mgmt->u.beacon), variable));
1587
1588         /*
1589          * either beacon or probe_resp but the variable field is at the
1590          * same offset
1591          */
1592         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1593         if (baselen > len)
1594                 return;
1595
1596         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1597                                false, &elems);
1598
1599         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
1600 }
1601
1602 void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1603                                    struct sk_buff *skb)
1604 {
1605         struct ieee80211_rx_status *rx_status;
1606         struct ieee80211_mgmt *mgmt;
1607         u16 fc;
1608         struct ieee802_11_elems elems;
1609         int ies_len;
1610
1611         rx_status = IEEE80211_SKB_RXCB(skb);
1612         mgmt = (struct ieee80211_mgmt *) skb->data;
1613         fc = le16_to_cpu(mgmt->frame_control);
1614
1615         sdata_lock(sdata);
1616
1617         if (!sdata->u.ibss.ssid_len)
1618                 goto mgmt_out; /* not ready to merge yet */
1619
1620         switch (fc & IEEE80211_FCTL_STYPE) {
1621         case IEEE80211_STYPE_PROBE_REQ:
1622                 ieee80211_rx_mgmt_probe_req(sdata, skb);
1623                 break;
1624         case IEEE80211_STYPE_PROBE_RESP:
1625         case IEEE80211_STYPE_BEACON:
1626                 ieee80211_rx_mgmt_probe_beacon(sdata, mgmt, skb->len,
1627                                                rx_status);
1628                 break;
1629         case IEEE80211_STYPE_AUTH:
1630                 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len);
1631                 break;
1632         case IEEE80211_STYPE_DEAUTH:
1633                 ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len);
1634                 break;
1635         case IEEE80211_STYPE_ACTION:
1636                 switch (mgmt->u.action.category) {
1637                 case WLAN_CATEGORY_SPECTRUM_MGMT:
1638                         ies_len = skb->len -
1639                                   offsetof(struct ieee80211_mgmt,
1640                                            u.action.u.chan_switch.variable);
1641
1642                         if (ies_len < 0)
1643                                 break;
1644
1645                         ieee802_11_parse_elems(
1646                                 mgmt->u.action.u.chan_switch.variable,
1647                                 ies_len, true, &elems);
1648
1649                         if (elems.parse_error)
1650                                 break;
1651
1652                         ieee80211_rx_mgmt_spectrum_mgmt(sdata, mgmt, skb->len,
1653                                                         rx_status, &elems);
1654                         break;
1655                 }
1656         }
1657
1658  mgmt_out:
1659         sdata_unlock(sdata);
1660 }
1661
1662 void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata)
1663 {
1664         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1665         struct sta_info *sta;
1666
1667         sdata_lock(sdata);
1668
1669         /*
1670          * Work could be scheduled after scan or similar
1671          * when we aren't even joined (or trying) with a
1672          * network.
1673          */
1674         if (!ifibss->ssid_len)
1675                 goto out;
1676
1677         spin_lock_bh(&ifibss->incomplete_lock);
1678         while (!list_empty(&ifibss->incomplete_stations)) {
1679                 sta = list_first_entry(&ifibss->incomplete_stations,
1680                                        struct sta_info, list);
1681                 list_del(&sta->list);
1682                 spin_unlock_bh(&ifibss->incomplete_lock);
1683
1684                 ieee80211_ibss_finish_sta(sta);
1685                 rcu_read_unlock();
1686                 spin_lock_bh(&ifibss->incomplete_lock);
1687         }
1688         spin_unlock_bh(&ifibss->incomplete_lock);
1689
1690         switch (ifibss->state) {
1691         case IEEE80211_IBSS_MLME_SEARCH:
1692                 ieee80211_sta_find_ibss(sdata);
1693                 break;
1694         case IEEE80211_IBSS_MLME_JOINED:
1695                 ieee80211_sta_merge_ibss(sdata);
1696                 break;
1697         default:
1698                 WARN_ON(1);
1699                 break;
1700         }
1701
1702  out:
1703         sdata_unlock(sdata);
1704 }
1705
1706 static void ieee80211_ibss_timer(unsigned long data)
1707 {
1708         struct ieee80211_sub_if_data *sdata =
1709                 (struct ieee80211_sub_if_data *) data;
1710
1711         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1712 }
1713
1714 void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata)
1715 {
1716         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1717
1718         setup_timer(&ifibss->timer, ieee80211_ibss_timer,
1719                     (unsigned long) sdata);
1720         INIT_LIST_HEAD(&ifibss->incomplete_stations);
1721         spin_lock_init(&ifibss->incomplete_lock);
1722         INIT_WORK(&ifibss->csa_connection_drop_work,
1723                   ieee80211_csa_connection_drop_work);
1724 }
1725
1726 /* scan finished notification */
1727 void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local)
1728 {
1729         struct ieee80211_sub_if_data *sdata;
1730
1731         mutex_lock(&local->iflist_mtx);
1732         list_for_each_entry(sdata, &local->interfaces, list) {
1733                 if (!ieee80211_sdata_running(sdata))
1734                         continue;
1735                 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
1736                         continue;
1737                 sdata->u.ibss.last_scan_completed = jiffies;
1738         }
1739         mutex_unlock(&local->iflist_mtx);
1740 }
1741
1742 int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
1743                         struct cfg80211_ibss_params *params)
1744 {
1745         u32 changed = 0;
1746         u32 rate_flags;
1747         struct ieee80211_supported_band *sband;
1748         enum ieee80211_chanctx_mode chanmode;
1749         struct ieee80211_local *local = sdata->local;
1750         int radar_detect_width = 0;
1751         int i;
1752         int ret;
1753
1754         ret = cfg80211_chandef_dfs_required(local->hw.wiphy,
1755                                             &params->chandef,
1756                                             sdata->wdev.iftype);
1757         if (ret < 0)
1758                 return ret;
1759
1760         if (ret > 0) {
1761                 if (!params->userspace_handles_dfs)
1762                         return -EINVAL;
1763                 radar_detect_width = BIT(params->chandef.width);
1764         }
1765
1766         chanmode = (params->channel_fixed && !ret) ?
1767                 IEEE80211_CHANCTX_SHARED : IEEE80211_CHANCTX_EXCLUSIVE;
1768
1769         mutex_lock(&local->chanctx_mtx);
1770         ret = ieee80211_check_combinations(sdata, &params->chandef, chanmode,
1771                                            radar_detect_width);
1772         mutex_unlock(&local->chanctx_mtx);
1773         if (ret < 0)
1774                 return ret;
1775
1776         if (params->bssid) {
1777                 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN);
1778                 sdata->u.ibss.fixed_bssid = true;
1779         } else
1780                 sdata->u.ibss.fixed_bssid = false;
1781
1782         sdata->u.ibss.privacy = params->privacy;
1783         sdata->u.ibss.control_port = params->control_port;
1784         sdata->u.ibss.userspace_handles_dfs = params->userspace_handles_dfs;
1785         sdata->u.ibss.basic_rates = params->basic_rates;
1786         sdata->u.ibss.last_scan_completed = jiffies;
1787
1788         /* fix basic_rates if channel does not support these rates */
1789         rate_flags = ieee80211_chandef_rate_flags(&params->chandef);
1790         sband = local->hw.wiphy->bands[params->chandef.chan->band];
1791         for (i = 0; i < sband->n_bitrates; i++) {
1792                 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
1793                         sdata->u.ibss.basic_rates &= ~BIT(i);
1794         }
1795         memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate,
1796                sizeof(params->mcast_rate));
1797
1798         sdata->vif.bss_conf.beacon_int = params->beacon_interval;
1799
1800         sdata->u.ibss.chandef = params->chandef;
1801         sdata->u.ibss.fixed_channel = params->channel_fixed;
1802
1803         if (params->ie) {
1804                 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len,
1805                                            GFP_KERNEL);
1806                 if (sdata->u.ibss.ie)
1807                         sdata->u.ibss.ie_len = params->ie_len;
1808         }
1809
1810         sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
1811         sdata->u.ibss.ibss_join_req = jiffies;
1812
1813         memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len);
1814         sdata->u.ibss.ssid_len = params->ssid_len;
1815
1816         memcpy(&sdata->u.ibss.ht_capa, &params->ht_capa,
1817                sizeof(sdata->u.ibss.ht_capa));
1818         memcpy(&sdata->u.ibss.ht_capa_mask, &params->ht_capa_mask,
1819                sizeof(sdata->u.ibss.ht_capa_mask));
1820
1821         /*
1822          * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is
1823          * reserved, but an HT STA shall protect HT transmissions as though
1824          * the HT Protection field were set to non-HT mixed mode.
1825          *
1826          * In an IBSS, the RIFS Mode field of the HT Operation element is
1827          * also reserved, but an HT STA shall operate as though this field
1828          * were set to 1.
1829          */
1830
1831         sdata->vif.bss_conf.ht_operation_mode |=
1832                   IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED
1833                 | IEEE80211_HT_PARAM_RIFS_MODE;
1834
1835         changed |= BSS_CHANGED_HT;
1836         ieee80211_bss_info_change_notify(sdata, changed);
1837
1838         sdata->smps_mode = IEEE80211_SMPS_OFF;
1839         sdata->needed_rx_chains = local->rx_chains;
1840
1841         ieee80211_queue_work(&local->hw, &sdata->work);
1842
1843         return 0;
1844 }
1845
1846 int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata)
1847 {
1848         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1849
1850         ieee80211_ibss_disconnect(sdata);
1851         ifibss->ssid_len = 0;
1852         eth_zero_addr(ifibss->bssid);
1853
1854         /* remove beacon */
1855         kfree(sdata->u.ibss.ie);
1856
1857         /* on the next join, re-program HT parameters */
1858         memset(&ifibss->ht_capa, 0, sizeof(ifibss->ht_capa));
1859         memset(&ifibss->ht_capa_mask, 0, sizeof(ifibss->ht_capa_mask));
1860
1861         synchronize_rcu();
1862
1863         skb_queue_purge(&sdata->skb_queue);
1864
1865         del_timer_sync(&sdata->u.ibss.timer);
1866
1867         return 0;
1868 }