net/mac80211/ibss.c

   1 /*
   2  * IBSS mode implementation
   3  * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
   4  * Copyright 2004, Instant802 Networks, Inc.
   5  * Copyright 2005, Devicescape Software, Inc.
   6  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   7  * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
   8  * Copyright 2009, Johannes Berg <johannes@sipsolutions.net>
   9  * Copyright 2013-2014  Intel Mobile Communications GmbH
  10  * Copyright(c) 2016 Intel Deutschland GmbH
  11  *
  12  * This program is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License version 2 as
  14  * published by the Free Software Foundation.
  15  */
  16
  17 #include <linux/delay.h>
  18 #include <linux/slab.h>
  19 #include <linux/if_ether.h>
  20 #include <linux/skbuff.h>
  21 #include <linux/if_arp.h>
  22 #include <linux/etherdevice.h>
  23 #include <linux/rtnetlink.h>
  24 #include <net/mac80211.h>
  25
  26 #include "ieee80211_i.h"
  27 #include "driver-ops.h"
  28 #include "rate.h"
  29
  30 #define IEEE80211_SCAN_INTERVAL (2 * HZ)
  31 #define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ)
  32
  33 #define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ)
  34 #define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ)
  35 #define IEEE80211_IBSS_RSN_INACTIVITY_LIMIT (10 * HZ)
  36
  37 #define IEEE80211_IBSS_MAX_STA_ENTRIES 128
  38
  39 static struct beacon_data *
  40 ieee80211_ibss_build_presp(struct ieee80211_sub_if_data *sdata,
  41                            const int beacon_int, const u32 basic_rates,
  42                            const u16 capability, u64 tsf,
  43                            struct cfg80211_chan_def *chandef,
  44                            bool *have_higher_than_11mbit,
  45                            struct cfg80211_csa_settings *csa_settings)
  46 {
  47         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
  48         struct ieee80211_local *local = sdata->local;
  49         int rates_n = 0, i, ri;
  50         struct ieee80211_mgmt *mgmt;
  51         u8 *pos;
  52         struct ieee80211_supported_band *sband;
  53         u32 rate_flags, rates = 0, rates_added = 0;
  54         struct beacon_data *presp;
  55         int frame_len;
  56         int shift;
  57
  58         /* Build IBSS probe response */
  59         frame_len = sizeof(struct ieee80211_hdr_3addr) +
  60                     12 /* struct ieee80211_mgmt.u.beacon */ +
  61                     2 + IEEE80211_MAX_SSID_LEN /* max SSID */ +
  62                     2 + 8 /* max Supported Rates */ +
  63                     3 /* max DS params */ +
  64                     4 /* IBSS params */ +
  65                     5 /* Channel Switch Announcement */ +
  66                     2 + (IEEE80211_MAX_SUPP_RATES - 8) +
  67                     2 + sizeof(struct ieee80211_ht_cap) +
  68                     2 + sizeof(struct ieee80211_ht_operation) +
  69                     2 + sizeof(struct ieee80211_vht_cap) +
  70                     2 + sizeof(struct ieee80211_vht_operation) +
  71                     ifibss->ie_len;
  72         presp = kzalloc(sizeof(*presp) + frame_len, GFP_KERNEL);
  73         if (!presp)
  74                 return NULL;
  75
  76         presp->head = (void *)(presp + 1);
  77
  78         mgmt = (void *) presp->head;
  79         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
  80                                           IEEE80211_STYPE_PROBE_RESP);
  81         eth_broadcast_addr(mgmt->da);
  82         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
  83         memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN);
  84         mgmt->u.beacon.beacon_int = cpu_to_le16(beacon_int);
  85         mgmt->u.beacon.timestamp = cpu_to_le64(tsf);
  86         mgmt->u.beacon.capab_info = cpu_to_le16(capability);
  87
  88         pos = (u8 *)mgmt + offsetof(struct ieee80211_mgmt, u.beacon.variable);
  89
  90         *pos++ = WLAN_EID_SSID;
  91         *pos++ = ifibss->ssid_len;
  92         memcpy(pos, ifibss->ssid, ifibss->ssid_len);
  93         pos += ifibss->ssid_len;
  94
  95         sband = local->hw.wiphy->bands[chandef->chan->band];
  96         rate_flags = ieee80211_chandef_rate_flags(chandef);
  97         shift = ieee80211_chandef_get_shift(chandef);
  98         rates_n = 0;
  99         if (have_higher_than_11mbit)
 100                 *have_higher_than_11mbit = false;
 101
 102         for (i = 0; i < sband->n_bitrates; i++) {
 103                 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
 104                         continue;
 105                 if (sband->bitrates[i].bitrate > 110 &&
 106                     have_higher_than_11mbit)
 107                         *have_higher_than_11mbit = true;
 108
 109                 rates |= BIT(i);
 110                 rates_n++;
 111         }
 112
 113         *pos++ = WLAN_EID_SUPP_RATES;
 114         *pos++ = min_t(int, 8, rates_n);
 115         for (ri = 0; ri < sband->n_bitrates; ri++) {
 116                 int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate,
 117                                         5 * (1 << shift));
 118                 u8 basic = 0;
 119                 if (!(rates & BIT(ri)))
 120                         continue;
 121
 122                 if (basic_rates & BIT(ri))
 123                         basic = 0x80;
 124                 *pos++ = basic | (u8) rate;
 125                 if (++rates_added == 8) {
 126                         ri++; /* continue at next rate for EXT_SUPP_RATES */
 127                         break;
 128                 }
 129         }
 130
 131         if (sband->band == IEEE80211_BAND_2GHZ) {
 132                 *pos++ = WLAN_EID_DS_PARAMS;
 133                 *pos++ = 1;
 134                 *pos++ = ieee80211_frequency_to_channel(
 135                                 chandef->chan->center_freq);
 136         }
 137
 138         *pos++ = WLAN_EID_IBSS_PARAMS;
 139         *pos++ = 2;
 140         /* FIX: set ATIM window based on scan results */
 141         *pos++ = 0;
 142         *pos++ = 0;
 143
 144         if (csa_settings) {
 145                 *pos++ = WLAN_EID_CHANNEL_SWITCH;
 146                 *pos++ = 3;
 147                 *pos++ = csa_settings->block_tx ? 1 : 0;
 148                 *pos++ = ieee80211_frequency_to_channel(
 149                                 csa_settings->chandef.chan->center_freq);
 150                 presp->csa_counter_offsets[0] = (pos - presp->head);
 151                 *pos++ = csa_settings->count;
 152                 presp->csa_current_counter = csa_settings->count;
 153         }
 154
 155         /* put the remaining rates in WLAN_EID_EXT_SUPP_RATES */
 156         if (rates_n > 8) {
 157                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 158                 *pos++ = rates_n - 8;
 159                 for (; ri < sband->n_bitrates; ri++) {
 160                         int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate,
 161                                                 5 * (1 << shift));
 162                         u8 basic = 0;
 163                         if (!(rates & BIT(ri)))
 164                                 continue;
 165
 166                         if (basic_rates & BIT(ri))
 167                                 basic = 0x80;
 168                         *pos++ = basic | (u8) rate;
 169                 }
 170         }
 171
 172         if (ifibss->ie_len) {
 173                 memcpy(pos, ifibss->ie, ifibss->ie_len);
 174                 pos += ifibss->ie_len;
 175         }
 176
 177         /* add HT capability and information IEs */
 178         if (chandef->width != NL80211_CHAN_WIDTH_20_NOHT &&
 179             chandef->width != NL80211_CHAN_WIDTH_5 &&
 180             chandef->width != NL80211_CHAN_WIDTH_10 &&
 181             sband->ht_cap.ht_supported) {
 182                 struct ieee80211_sta_ht_cap ht_cap;
 183
 184                 memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
 185                 ieee80211_apply_htcap_overrides(sdata, &ht_cap);
 186
 187                 pos = ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap);
 188                 /*
 189                  * Note: According to 802.11n-2009 9.13.3.1, HT Protection
 190                  * field and RIFS Mode are reserved in IBSS mode, therefore
 191                  * keep them at 0
 192                  */
 193                 pos = ieee80211_ie_build_ht_oper(pos, &sband->ht_cap,
 194                                                  chandef, 0, false);
 195
 196                 /* add VHT capability and information IEs */
 197                 if (chandef->width != NL80211_CHAN_WIDTH_20 &&
 198                     chandef->width != NL80211_CHAN_WIDTH_40 &&
 199                     sband->vht_cap.vht_supported) {
 200                         pos = ieee80211_ie_build_vht_cap(pos, &sband->vht_cap,
 201                                                          sband->vht_cap.cap);
 202                         pos = ieee80211_ie_build_vht_oper(pos, &sband->vht_cap,
 203                                                           chandef);
 204                 }
 205         }
 206
 207         if (local->hw.queues >= IEEE80211_NUM_ACS)
 208                 pos = ieee80211_add_wmm_info_ie(pos, 0); /* U-APSD not in use */
 209
 210         presp->head_len = pos - presp->head;
 211         if (WARN_ON(presp->head_len > frame_len))
 212                 goto error;
 213
 214         return presp;
 215 error:
 216         kfree(presp);
 217         return NULL;
 218 }
 219
 220 static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
 221                                       const u8 *bssid, const int beacon_int,
 222                                       struct cfg80211_chan_def *req_chandef,
 223                                       const u32 basic_rates,
 224                                       const u16 capability, u64 tsf,
 225                                       bool creator)
 226 {
 227         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 228         struct ieee80211_local *local = sdata->local;
 229         struct ieee80211_mgmt *mgmt;
 230         struct cfg80211_bss *bss;
 231         u32 bss_change;
 232         struct cfg80211_chan_def chandef;
 233         struct ieee80211_channel *chan;
 234         struct beacon_data *presp;
 235         struct cfg80211_inform_bss bss_meta = {};
 236         bool have_higher_than_11mbit;
 237         bool radar_required;
 238         int err;
 239
 240         sdata_assert_lock(sdata);
 241
 242         /* Reset own TSF to allow time synchronization work. */
 243         drv_reset_tsf(local, sdata);
 244
 245         if (!ether_addr_equal(ifibss->bssid, bssid))
 246                 sta_info_flush(sdata);
 247
 248         /* if merging, indicate to driver that we leave the old IBSS */
 249         if (sdata->vif.bss_conf.ibss_joined) {
 250                 sdata->vif.bss_conf.ibss_joined = false;
 251                 sdata->vif.bss_conf.ibss_creator = false;
 252                 sdata->vif.bss_conf.enable_beacon = false;
 253                 netif_carrier_off(sdata->dev);
 254                 ieee80211_bss_info_change_notify(sdata,
 255                                                  BSS_CHANGED_IBSS |
 256                                                  BSS_CHANGED_BEACON_ENABLED);
 257                 drv_leave_ibss(local, sdata);
 258         }
 259
 260         presp = rcu_dereference_protected(ifibss->presp,
 261                                           lockdep_is_held(&sdata->wdev.mtx));
 262         RCU_INIT_POINTER(ifibss->presp, NULL);
 263         if (presp)
 264                 kfree_rcu(presp, rcu_head);
 265
 266         /* make a copy of the chandef, it could be modified below. */
 267         chandef = *req_chandef;
 268         chan = chandef.chan;
 269         if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef,
 270                                      NL80211_IFTYPE_ADHOC)) {
 271                 if (chandef.width == NL80211_CHAN_WIDTH_5 ||
 272                     chandef.width == NL80211_CHAN_WIDTH_10 ||
 273                     chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
 274                     chandef.width == NL80211_CHAN_WIDTH_20) {
 275                         sdata_info(sdata,
 276                                    "Failed to join IBSS, beacons forbidden\n");
 277                         return;
 278                 }
 279                 chandef.width = NL80211_CHAN_WIDTH_20;
 280                 chandef.center_freq1 = chan->center_freq;
 281                 /* check again for downgraded chandef */
 282                 if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef,
 283                                              NL80211_IFTYPE_ADHOC)) {
 284                         sdata_info(sdata,
 285                                    "Failed to join IBSS, beacons forbidden\n");
 286                         return;
 287                 }
 288         }
 289
 290         err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
 291                                             &chandef, NL80211_IFTYPE_ADHOC);
 292         if (err < 0) {
 293                 sdata_info(sdata,
 294                            "Failed to join IBSS, invalid chandef\n");
 295                 return;
 296         }
 297         if (err > 0 && !ifibss->userspace_handles_dfs) {
 298                 sdata_info(sdata,
 299                            "Failed to join IBSS, DFS channel without control program\n");
 300                 return;
 301         }
 302
 303         radar_required = err;
 304
 305         mutex_lock(&local->mtx);
 306         if (ieee80211_vif_use_channel(sdata, &chandef,
 307                                       ifibss->fixed_channel ?
 308                                         IEEE80211_CHANCTX_SHARED :
 309                                         IEEE80211_CHANCTX_EXCLUSIVE)) {
 310                 sdata_info(sdata, "Failed to join IBSS, no channel context\n");
 311                 mutex_unlock(&local->mtx);
 312                 return;
 313         }
 314         sdata->radar_required = radar_required;
 315         mutex_unlock(&local->mtx);
 316
 317         memcpy(ifibss->bssid, bssid, ETH_ALEN);
 318
 319         presp = ieee80211_ibss_build_presp(sdata, beacon_int, basic_rates,
 320                                            capability, tsf, &chandef,
 321                                            &have_higher_than_11mbit, NULL);
 322         if (!presp)
 323                 return;
 324
 325         rcu_assign_pointer(ifibss->presp, presp);
 326         mgmt = (void *)presp->head;
 327
 328         sdata->vif.bss_conf.enable_beacon = true;
 329         sdata->vif.bss_conf.beacon_int = beacon_int;
 330         sdata->vif.bss_conf.basic_rates = basic_rates;
 331         sdata->vif.bss_conf.ssid_len = ifibss->ssid_len;
 332         memcpy(sdata->vif.bss_conf.ssid, ifibss->ssid, ifibss->ssid_len);
 333         bss_change = BSS_CHANGED_BEACON_INT;
 334         bss_change |= ieee80211_reset_erp_info(sdata);
 335         bss_change |= BSS_CHANGED_BSSID;
 336         bss_change |= BSS_CHANGED_BEACON;
 337         bss_change |= BSS_CHANGED_BEACON_ENABLED;
 338         bss_change |= BSS_CHANGED_BASIC_RATES;
 339         bss_change |= BSS_CHANGED_HT;
 340         bss_change |= BSS_CHANGED_IBSS;
 341         bss_change |= BSS_CHANGED_SSID;
 342
 343         /*
 344          * In 5 GHz/802.11a, we can always use short slot time.
 345          * (IEEE 802.11-2012 18.3.8.7)
 346          *
 347          * In 2.4GHz, we must always use long slots in IBSS for compatibility
 348          * reasons.
 349          * (IEEE 802.11-2012 19.4.5)
 350          *
 351          * HT follows these specifications (IEEE 802.11-2012 20.3.18)
 352          */
 353         sdata->vif.bss_conf.use_short_slot = chan->band == IEEE80211_BAND_5GHZ;
 354         bss_change |= BSS_CHANGED_ERP_SLOT;
 355
 356         /* cf. IEEE 802.11 9.2.12 */
 357         if (chan->band == IEEE80211_BAND_2GHZ && have_higher_than_11mbit)
 358                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
 359         else
 360                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
 361
 362         ieee80211_set_wmm_default(sdata, true, false);
 363
 364         sdata->vif.bss_conf.ibss_joined = true;
 365         sdata->vif.bss_conf.ibss_creator = creator;
 366
 367         err = drv_join_ibss(local, sdata);
 368         if (err) {
 369                 sdata->vif.bss_conf.ibss_joined = false;
 370                 sdata->vif.bss_conf.ibss_creator = false;
 371                 sdata->vif.bss_conf.enable_beacon = false;
 372                 sdata->vif.bss_conf.ssid_len = 0;
 373                 RCU_INIT_POINTER(ifibss->presp, NULL);
 374                 kfree_rcu(presp, rcu_head);
 375                 mutex_lock(&local->mtx);
 376                 ieee80211_vif_release_channel(sdata);
 377                 mutex_unlock(&local->mtx);
 378                 sdata_info(sdata, "Failed to join IBSS, driver failure: %d\n",
 379                            err);
 380                 return;
 381         }
 382
 383         ieee80211_bss_info_change_notify(sdata, bss_change);
 384
 385         ifibss->state = IEEE80211_IBSS_MLME_JOINED;
 386         mod_timer(&ifibss->timer,
 387                   round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
 388
 389         bss_meta.chan = chan;
 390         bss_meta.scan_width = cfg80211_chandef_to_scan_width(&chandef);
 391         bss = cfg80211_inform_bss_frame_data(local->hw.wiphy, &bss_meta, mgmt,
 392                                              presp->head_len, GFP_KERNEL);
 393
 394         cfg80211_put_bss(local->hw.wiphy, bss);
 395         netif_carrier_on(sdata->dev);
 396         cfg80211_ibss_joined(sdata->dev, ifibss->bssid, chan, GFP_KERNEL);
 397 }
 398
 399 static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
 400                                     struct ieee80211_bss *bss)
 401 {
 402         struct cfg80211_bss *cbss =
 403                 container_of((void *)bss, struct cfg80211_bss, priv);
 404         struct ieee80211_supported_band *sband;
 405         struct cfg80211_chan_def chandef;
 406         u32 basic_rates;
 407         int i, j;
 408         u16 beacon_int = cbss->beacon_interval;
 409         const struct cfg80211_bss_ies *ies;
 410         enum nl80211_channel_type chan_type;
 411         u64 tsf;
 412         u32 rate_flags;
 413         int shift;
 414
 415         sdata_assert_lock(sdata);
 416
 417         if (beacon_int < 10)
 418                 beacon_int = 10;
 419
 420         switch (sdata->u.ibss.chandef.width) {
 421         case NL80211_CHAN_WIDTH_20_NOHT:
 422         case NL80211_CHAN_WIDTH_20:
 423         case NL80211_CHAN_WIDTH_40:
 424                 chan_type = cfg80211_get_chandef_type(&sdata->u.ibss.chandef);
 425                 cfg80211_chandef_create(&chandef, cbss->channel, chan_type);
 426                 break;
 427         case NL80211_CHAN_WIDTH_5:
 428         case NL80211_CHAN_WIDTH_10:
 429                 cfg80211_chandef_create(&chandef, cbss->channel,
 430                                         NL80211_CHAN_WIDTH_20_NOHT);
 431                 chandef.width = sdata->u.ibss.chandef.width;
 432                 break;
 433         case NL80211_CHAN_WIDTH_80:
 434         case NL80211_CHAN_WIDTH_160:
 435                 chandef = sdata->u.ibss.chandef;
 436                 chandef.chan = cbss->channel;
 437                 break;
 438         default:
 439                 /* fall back to 20 MHz for unsupported modes */
 440                 cfg80211_chandef_create(&chandef, cbss->channel,
 441                                         NL80211_CHAN_WIDTH_20_NOHT);
 442                 break;
 443         }
 444
 445         sband = sdata->local->hw.wiphy->bands[cbss->channel->band];
 446         rate_flags = ieee80211_chandef_rate_flags(&sdata->u.ibss.chandef);
 447         shift = ieee80211_vif_get_shift(&sdata->vif);
 448
 449         basic_rates = 0;
 450
 451         for (i = 0; i < bss->supp_rates_len; i++) {
 452                 int rate = bss->supp_rates[i] & 0x7f;
 453                 bool is_basic = !!(bss->supp_rates[i] & 0x80);
 454
 455                 for (j = 0; j < sband->n_bitrates; j++) {
 456                         int brate;
 457                         if ((rate_flags & sband->bitrates[j].flags)
 458                             != rate_flags)
 459                                 continue;
 460
 461                         brate = DIV_ROUND_UP(sband->bitrates[j].bitrate,
 462                                              5 * (1 << shift));
 463                         if (brate == rate) {
 464                                 if (is_basic)
 465                                         basic_rates |= BIT(j);
 466                                 break;
 467                         }
 468                 }
 469         }
 470
 471         rcu_read_lock();
 472         ies = rcu_dereference(cbss->ies);
 473         tsf = ies->tsf;
 474         rcu_read_unlock();
 475
 476         __ieee80211_sta_join_ibss(sdata, cbss->bssid,
 477                                   beacon_int,
 478                                   &chandef,
 479                                   basic_rates,
 480                                   cbss->capability,
 481                                   tsf, false);
 482 }
 483
 484 int ieee80211_ibss_csa_beacon(struct ieee80211_sub_if_data *sdata,
 485                               struct cfg80211_csa_settings *csa_settings)
 486 {
 487         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 488         struct beacon_data *presp, *old_presp;
 489         struct cfg80211_bss *cbss;
 490         const struct cfg80211_bss_ies *ies;
 491         u16 capability = WLAN_CAPABILITY_IBSS;
 492         u64 tsf;
 493         int ret = 0;
 494
 495         sdata_assert_lock(sdata);
 496
 497         if (ifibss->privacy)
 498                 capability |= WLAN_CAPABILITY_PRIVACY;
 499
 500         cbss = cfg80211_get_bss(sdata->local->hw.wiphy, ifibss->chandef.chan,
 501                                 ifibss->bssid, ifibss->ssid,
 502                                 ifibss->ssid_len, IEEE80211_BSS_TYPE_IBSS,
 503                                 IEEE80211_PRIVACY(ifibss->privacy));
 504
 505         if (WARN_ON(!cbss)) {
 506                 ret = -EINVAL;
 507                 goto out;
 508         }
 509
 510         rcu_read_lock();
 511         ies = rcu_dereference(cbss->ies);
 512         tsf = ies->tsf;
 513         rcu_read_unlock();
 514         cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
 515
 516         old_presp = rcu_dereference_protected(ifibss->presp,
 517                                           lockdep_is_held(&sdata->wdev.mtx));
 518
 519         presp = ieee80211_ibss_build_presp(sdata,
 520                                            sdata->vif.bss_conf.beacon_int,
 521                                            sdata->vif.bss_conf.basic_rates,
 522                                            capability, tsf, &ifibss->chandef,
 523                                            NULL, csa_settings);
 524         if (!presp) {
 525                 ret = -ENOMEM;
 526                 goto out;
 527         }
 528
 529         rcu_assign_pointer(ifibss->presp, presp);
 530         if (old_presp)
 531                 kfree_rcu(old_presp, rcu_head);
 532
 533         return BSS_CHANGED_BEACON;
 534  out:
 535         return ret;
 536 }
 537
 538 int ieee80211_ibss_finish_csa(struct ieee80211_sub_if_data *sdata)
 539 {
 540         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 541         struct cfg80211_bss *cbss;
 542         int err, changed = 0;
 543
 544         sdata_assert_lock(sdata);
 545
 546         /* update cfg80211 bss information with the new channel */
 547         if (!is_zero_ether_addr(ifibss->bssid)) {
 548                 cbss = cfg80211_get_bss(sdata->local->hw.wiphy,
 549                                         ifibss->chandef.chan,
 550                                         ifibss->bssid, ifibss->ssid,
 551                                         ifibss->ssid_len,
 552                                         IEEE80211_BSS_TYPE_IBSS,
 553                                         IEEE80211_PRIVACY(ifibss->privacy));
 554                 /* XXX: should not really modify cfg80211 data */
 555                 if (cbss) {
 556                         cbss->channel = sdata->csa_chandef.chan;
 557                         cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
 558                 }
 559         }
 560
 561         ifibss->chandef = sdata->csa_chandef;
 562
 563         /* generate the beacon */
 564         err = ieee80211_ibss_csa_beacon(sdata, NULL);
 565         if (err < 0)
 566                 return err;
 567
 568         changed |= err;
 569
 570         return changed;
 571 }
 572
 573 void ieee80211_ibss_stop(struct ieee80211_sub_if_data *sdata)
 574 {
 575         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 576
 577         cancel_work_sync(&ifibss->csa_connection_drop_work);
 578 }
 579
 580 static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta)
 581         __acquires(RCU)
 582 {
 583         struct ieee80211_sub_if_data *sdata = sta->sdata;
 584         u8 addr[ETH_ALEN];
 585
 586         memcpy(addr, sta->sta.addr, ETH_ALEN);
 587
 588         ibss_dbg(sdata, "Adding new IBSS station %pM\n", addr);
 589
 590         sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
 591         sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
 592         /* authorize the station only if the network is not RSN protected. If
 593          * not wait for the userspace to authorize it */
 594         if (!sta->sdata->u.ibss.control_port)
 595                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
 596
 597         rate_control_rate_init(sta);
 598
 599         /* If it fails, maybe we raced another insertion? */
 600         if (sta_info_insert_rcu(sta))
 601                 return sta_info_get(sdata, addr);
 602         return sta;
 603 }
 604
 605 static struct sta_info *
 606 ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, const u8 *bssid,
 607                        const u8 *addr, u32 supp_rates)
 608         __acquires(RCU)
 609 {
 610         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 611         struct ieee80211_local *local = sdata->local;
 612         struct sta_info *sta;
 613         struct ieee80211_chanctx_conf *chanctx_conf;
 614         struct ieee80211_supported_band *sband;
 615         enum nl80211_bss_scan_width scan_width;
 616         int band;
 617
 618         /*
 619          * XXX: Consider removing the least recently used entry and
 620          *      allow new one to be added.
 621          */
 622         if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
 623                 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
 624                                     sdata->name, addr);
 625                 rcu_read_lock();
 626                 return NULL;
 627         }
 628
 629         if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) {
 630                 rcu_read_lock();
 631                 return NULL;
 632         }
 633
 634         if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) {
 635                 rcu_read_lock();
 636                 return NULL;
 637         }
 638
 639         rcu_read_lock();
 640         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 641         if (WARN_ON_ONCE(!chanctx_conf))
 642                 return NULL;
 643         band = chanctx_conf->def.chan->band;
 644         scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
 645         rcu_read_unlock();
 646
 647         sta = sta_info_alloc(sdata, addr, GFP_KERNEL);
 648         if (!sta) {
 649                 rcu_read_lock();
 650                 return NULL;
 651         }
 652
 653         sta->rx_stats.last_rx = jiffies;
 654
 655         /* make sure mandatory rates are always added */
 656         sband = local->hw.wiphy->bands[band];
 657         sta->sta.supp_rates[band] = supp_rates |
 658                         ieee80211_mandatory_rates(sband, scan_width);
 659
 660         return ieee80211_ibss_finish_sta(sta);
 661 }
 662
 663 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
 664 {
 665         struct ieee80211_local *local = sdata->local;
 666         int active = 0;
 667         struct sta_info *sta;
 668
 669         sdata_assert_lock(sdata);
 670
 671         rcu_read_lock();
 672
 673         list_for_each_entry_rcu(sta, &local->sta_list, list) {
 674                 if (sta->sdata == sdata &&
 675                     time_after(sta->rx_stats.last_rx +
 676                                IEEE80211_IBSS_MERGE_INTERVAL,
 677                                jiffies)) {
 678                         active++;
 679                         break;
 680                 }
 681         }
 682
 683         rcu_read_unlock();
 684
 685         return active;
 686 }
 687
 688 static void ieee80211_ibss_disconnect(struct ieee80211_sub_if_data *sdata)
 689 {
 690         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 691         struct ieee80211_local *local = sdata->local;
 692         struct cfg80211_bss *cbss;
 693         struct beacon_data *presp;
 694         struct sta_info *sta;
 695
 696         if (!is_zero_ether_addr(ifibss->bssid)) {
 697                 cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->chandef.chan,
 698                                         ifibss->bssid, ifibss->ssid,
 699                                         ifibss->ssid_len,
 700                                         IEEE80211_BSS_TYPE_IBSS,
 701                                         IEEE80211_PRIVACY(ifibss->privacy));
 702
 703                 if (cbss) {
 704                         cfg80211_unlink_bss(local->hw.wiphy, cbss);
 705                         cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
 706                 }
 707         }
 708
 709         ifibss->state = IEEE80211_IBSS_MLME_SEARCH;
 710
 711         sta_info_flush(sdata);
 712
 713         spin_lock_bh(&ifibss->incomplete_lock);
 714         while (!list_empty(&ifibss->incomplete_stations)) {
 715                 sta = list_first_entry(&ifibss->incomplete_stations,
 716                                        struct sta_info, list);
 717                 list_del(&sta->list);
 718                 spin_unlock_bh(&ifibss->incomplete_lock);
 719
 720                 sta_info_free(local, sta);
 721                 spin_lock_bh(&ifibss->incomplete_lock);
 722         }
 723         spin_unlock_bh(&ifibss->incomplete_lock);
 724
 725         netif_carrier_off(sdata->dev);
 726
 727         sdata->vif.bss_conf.ibss_joined = false;
 728         sdata->vif.bss_conf.ibss_creator = false;
 729         sdata->vif.bss_conf.enable_beacon = false;
 730         sdata->vif.bss_conf.ssid_len = 0;
 731
 732         /* remove beacon */
 733         presp = rcu_dereference_protected(ifibss->presp,
 734                                           lockdep_is_held(&sdata->wdev.mtx));
 735         RCU_INIT_POINTER(sdata->u.ibss.presp, NULL);
 736         if (presp)
 737                 kfree_rcu(presp, rcu_head);
 738
 739         clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state);
 740         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED |
 741                                                 BSS_CHANGED_IBSS);
 742         drv_leave_ibss(local, sdata);
 743         mutex_lock(&local->mtx);
 744         ieee80211_vif_release_channel(sdata);
 745         mutex_unlock(&local->mtx);
 746 }
 747
 748 static void ieee80211_csa_connection_drop_work(struct work_struct *work)
 749 {
 750         struct ieee80211_sub_if_data *sdata =
 751                 container_of(work, struct ieee80211_sub_if_data,
 752                              u.ibss.csa_connection_drop_work);
 753
 754         sdata_lock(sdata);
 755
 756         ieee80211_ibss_disconnect(sdata);
 757         synchronize_rcu();
 758         skb_queue_purge(&sdata->skb_queue);
 759
 760         /* trigger a scan to find another IBSS network to join */
 761         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
 762
 763         sdata_unlock(sdata);
 764 }
 765
 766 static void ieee80211_ibss_csa_mark_radar(struct ieee80211_sub_if_data *sdata)
 767 {
 768         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 769         int err;
 770
 771         /* if the current channel is a DFS channel, mark the channel as
 772          * unavailable.
 773          */
 774         err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
 775                                             &ifibss->chandef,
 776                                             NL80211_IFTYPE_ADHOC);
 777         if (err > 0)
 778                 cfg80211_radar_event(sdata->local->hw.wiphy, &ifibss->chandef,
 779                                      GFP_ATOMIC);
 780 }
 781
 782 static bool
 783 ieee80211_ibss_process_chanswitch(struct ieee80211_sub_if_data *sdata,
 784                                   struct ieee802_11_elems *elems,
 785                                   bool beacon)
 786 {
 787         struct cfg80211_csa_settings params;
 788         struct ieee80211_csa_ie csa_ie;
 789         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 790         enum nl80211_channel_type ch_type;
 791         int err;
 792         u32 sta_flags;
 793
 794         sdata_assert_lock(sdata);
 795
 796         sta_flags = IEEE80211_STA_DISABLE_VHT;
 797         switch (ifibss->chandef.width) {
 798         case NL80211_CHAN_WIDTH_5:
 799         case NL80211_CHAN_WIDTH_10:
 800         case NL80211_CHAN_WIDTH_20_NOHT:
 801                 sta_flags |= IEEE80211_STA_DISABLE_HT;
 802                 /* fall through */
 803         case NL80211_CHAN_WIDTH_20:
 804                 sta_flags |= IEEE80211_STA_DISABLE_40MHZ;
 805                 break;
 806         default:
 807                 break;
 808         }
 809
 810         memset(&params, 0, sizeof(params));
 811         memset(&csa_ie, 0, sizeof(csa_ie));
 812         err = ieee80211_parse_ch_switch_ie(sdata, elems,
 813                                            ifibss->chandef.chan->band,
 814                                            sta_flags, ifibss->bssid, &csa_ie);
 815         /* can't switch to destination channel, fail */
 816         if (err < 0)
 817                 goto disconnect;
 818
 819         /* did not contain a CSA */
 820         if (err)
 821                 return false;
 822
 823         /* channel switch is not supported, disconnect */
 824         if (!(sdata->local->hw.wiphy->flags & WIPHY_FLAG_HAS_CHANNEL_SWITCH))
 825                 goto disconnect;
 826
 827         params.count = csa_ie.count;
 828         params.chandef = csa_ie.chandef;
 829
 830         switch (ifibss->chandef.width) {
 831         case NL80211_CHAN_WIDTH_20_NOHT:
 832         case NL80211_CHAN_WIDTH_20:
 833         case NL80211_CHAN_WIDTH_40:
 834                 /* keep our current HT mode (HT20/HT40+/HT40-), even if
 835                  * another mode  has been announced. The mode is not adopted
 836                  * within the beacon while doing CSA and we should therefore
 837                  * keep the mode which we announce.
 838                  */
 839                 ch_type = cfg80211_get_chandef_type(&ifibss->chandef);
 840                 cfg80211_chandef_create(&params.chandef, params.chandef.chan,
 841                                         ch_type);
 842                 break;
 843         case NL80211_CHAN_WIDTH_5:
 844         case NL80211_CHAN_WIDTH_10:
 845                 if (params.chandef.width != ifibss->chandef.width) {
 846                         sdata_info(sdata,
 847                                    "IBSS %pM received channel switch from incompatible channel width (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
 848                                    ifibss->bssid,
 849                                    params.chandef.chan->center_freq,
 850                                    params.chandef.width,
 851                                    params.chandef.center_freq1,
 852                                    params.chandef.center_freq2);
 853                         goto disconnect;
 854                 }
 855                 break;
 856         default:
 857                 /* should not happen, sta_flags should prevent VHT modes. */
 858                 WARN_ON(1);
 859                 goto disconnect;
 860         }
 861
 862         if (!cfg80211_reg_can_beacon(sdata->local->hw.wiphy, &params.chandef,
 863                                      NL80211_IFTYPE_ADHOC)) {
 864                 sdata_info(sdata,
 865                            "IBSS %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
 866                            ifibss->bssid,
 867                            params.chandef.chan->center_freq,
 868                            params.chandef.width,
 869                            params.chandef.center_freq1,
 870                            params.chandef.center_freq2);
 871                 goto disconnect;
 872         }
 873
 874         err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
 875                                             &params.chandef,
 876                                             NL80211_IFTYPE_ADHOC);
 877         if (err < 0)
 878                 goto disconnect;
 879         if (err > 0 && !ifibss->userspace_handles_dfs) {
 880                 /* IBSS-DFS only allowed with a control program */
 881                 goto disconnect;
 882         }
 883
 884         params.radar_required = err;
 885
 886         if (cfg80211_chandef_identical(&params.chandef,
 887                                        &sdata->vif.bss_conf.chandef)) {
 888                 ibss_dbg(sdata,
 889                          "received csa with an identical chandef, ignoring\n");
 890                 return true;
 891         }
 892
 893         /* all checks done, now perform the channel switch. */
 894         ibss_dbg(sdata,
 895                  "received channel switch announcement to go to channel %d MHz\n",
 896                  params.chandef.chan->center_freq);
 897
 898         params.block_tx = !!csa_ie.mode;
 899
 900         if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev,
 901                                      &params))
 902                 goto disconnect;
 903
 904         ieee80211_ibss_csa_mark_radar(sdata);
 905
 906         return true;
 907 disconnect:
 908         ibss_dbg(sdata, "Can't handle channel switch, disconnect\n");
 909         ieee80211_queue_work(&sdata->local->hw,
 910                              &ifibss->csa_connection_drop_work);
 911
 912         ieee80211_ibss_csa_mark_radar(sdata);
 913
 914         return true;
 915 }
 916
 917 static void
 918 ieee80211_rx_mgmt_spectrum_mgmt(struct ieee80211_sub_if_data *sdata,
 919                                 struct ieee80211_mgmt *mgmt, size_t len,
 920                                 struct ieee80211_rx_status *rx_status,
 921                                 struct ieee802_11_elems *elems)
 922 {
 923         int required_len;
 924
 925         if (len < IEEE80211_MIN_ACTION_SIZE + 1)
 926                 return;
 927
 928         /* CSA is the only action we handle for now */
 929         if (mgmt->u.action.u.measurement.action_code !=
 930             WLAN_ACTION_SPCT_CHL_SWITCH)
 931                 return;
 932
 933         required_len = IEEE80211_MIN_ACTION_SIZE +
 934                        sizeof(mgmt->u.action.u.chan_switch);
 935         if (len < required_len)
 936                 return;
 937
 938         if (!sdata->vif.csa_active)
 939                 ieee80211_ibss_process_chanswitch(sdata, elems, false);
 940 }
 941
 942 static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data *sdata,
 943                                           struct ieee80211_mgmt *mgmt,
 944                                           size_t len)
 945 {
 946         u16 reason = le16_to_cpu(mgmt->u.deauth.reason_code);
 947
 948         if (len < IEEE80211_DEAUTH_FRAME_LEN)
 949                 return;
 950
 951         ibss_dbg(sdata, "RX DeAuth SA=%pM DA=%pM\n", mgmt->sa, mgmt->da);
 952         ibss_dbg(sdata, "\tBSSID=%pM (reason: %d)\n", mgmt->bssid, reason);
 953         sta_info_destroy_addr(sdata, mgmt->sa);
 954 }
 955
 956 static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata,
 957                                         struct ieee80211_mgmt *mgmt,
 958                                         size_t len)
 959 {
 960         u16 auth_alg, auth_transaction;
 961
 962         sdata_assert_lock(sdata);
 963
 964         if (len < 24 + 6)
 965                 return;
 966
 967         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
 968         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
 969
 970         ibss_dbg(sdata, "RX Auth SA=%pM DA=%pM\n", mgmt->sa, mgmt->da);
 971         ibss_dbg(sdata, "\tBSSID=%pM (auth_transaction=%d)\n",
 972                  mgmt->bssid, auth_transaction);
 973
 974         if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
 975                 return;
 976
 977         /*
 978          * IEEE 802.11 standard does not require authentication in IBSS
 979          * networks and most implementations do not seem to use it.
 980          * However, try to reply to authentication attempts if someone
 981          * has actually implemented this.
 982          */
 983         ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, 0, NULL, 0,
 984                             mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0, 0);
 985 }
 986
 987 static void ieee80211_update_sta_info(struct ieee80211_sub_if_data *sdata,
 988                                       struct ieee80211_mgmt *mgmt, size_t len,
 989                                       struct ieee80211_rx_status *rx_status,
 990                                       struct ieee802_11_elems *elems,
 991                                       struct ieee80211_channel *channel)
 992 {
 993         struct sta_info *sta;
 994         enum ieee80211_band band = rx_status->band;
 995         enum nl80211_bss_scan_width scan_width;
 996         struct ieee80211_local *local = sdata->local;
 997         struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band];
 998         bool rates_updated = false;
 999         u32 supp_rates = 0;
1000
1001         if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
1002                 return;
1003
1004         if (!ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid))
1005                 return;
1006
1007         rcu_read_lock();
1008         sta = sta_info_get(sdata, mgmt->sa);
1009
1010         if (elems->supp_rates) {
1011                 supp_rates = ieee80211_sta_get_rates(sdata, elems,
1012                                                      band, NULL);
1013                 if (sta) {
1014                         u32 prev_rates;
1015
1016                         prev_rates = sta->sta.supp_rates[band];
1017                         /* make sure mandatory rates are always added */
1018                         scan_width = NL80211_BSS_CHAN_WIDTH_20;
1019                         if (rx_status->flag & RX_FLAG_5MHZ)
1020                                 scan_width = NL80211_BSS_CHAN_WIDTH_5;
1021                         if (rx_status->flag & RX_FLAG_10MHZ)
1022                                 scan_width = NL80211_BSS_CHAN_WIDTH_10;
1023
1024                         sta->sta.supp_rates[band] = supp_rates |
1025                                 ieee80211_mandatory_rates(sband, scan_width);
1026                         if (sta->sta.supp_rates[band] != prev_rates) {
1027                                 ibss_dbg(sdata,
1028                                          "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n",
1029                                          sta->sta.addr, prev_rates,
1030                                          sta->sta.supp_rates[band]);
1031                                 rates_updated = true;
1032                         }
1033                 } else {
1034                         rcu_read_unlock();
1035                         sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid,
1036                                                      mgmt->sa, supp_rates);
1037                 }
1038         }
1039
1040         if (sta && !sta->sta.wme &&
1041             elems->wmm_info && local->hw.queues >= IEEE80211_NUM_ACS) {
1042                 sta->sta.wme = true;
1043                 ieee80211_check_fast_xmit(sta);
1044         }
1045
1046         if (sta && elems->ht_operation && elems->ht_cap_elem &&
1047             sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20_NOHT &&
1048             sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_5 &&
1049             sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_10) {
1050                 /* we both use HT */
1051                 struct ieee80211_ht_cap htcap_ie;
1052                 struct cfg80211_chan_def chandef;
1053                 enum ieee80211_sta_rx_bandwidth bw = sta->sta.bandwidth;
1054
1055                 ieee80211_ht_oper_to_chandef(channel,
1056                                              elems->ht_operation,
1057                                              &chandef);
1058
1059                 memcpy(&htcap_ie, elems->ht_cap_elem, sizeof(htcap_ie));
1060                 rates_updated |= ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
1061                                                                    &htcap_ie,
1062                                                                    sta);
1063
1064                 if (elems->vht_operation && elems->vht_cap_elem &&
1065                     sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20 &&
1066                     sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_40) {
1067                         /* we both use VHT */
1068                         struct ieee80211_vht_cap cap_ie;
1069                         struct ieee80211_sta_vht_cap cap = sta->sta.vht_cap;
1070
1071                         ieee80211_vht_oper_to_chandef(channel,
1072                                                       elems->vht_operation,
1073                                                       &chandef);
1074                         memcpy(&cap_ie, elems->vht_cap_elem, sizeof(cap_ie));
1075                         ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
1076                                                             &cap_ie, sta);
1077                         if (memcmp(&cap, &sta->sta.vht_cap, sizeof(cap)))
1078                                 rates_updated |= true;
1079                 }
1080
1081                 if (bw != sta->sta.bandwidth)
1082                         rates_updated |= true;
1083
1084                 if (!cfg80211_chandef_compatible(&sdata->u.ibss.chandef,
1085                                                  &chandef))
1086                         WARN_ON_ONCE(1);
1087         }
1088
1089         if (sta && rates_updated) {
1090                 u32 changed = IEEE80211_RC_SUPP_RATES_CHANGED;
1091                 u8 rx_nss = sta->sta.rx_nss;
1092
1093                 /* Force rx_nss recalculation */
1094                 sta->sta.rx_nss = 0;
1095                 rate_control_rate_init(sta);
1096                 if (sta->sta.rx_nss != rx_nss)
1097                         changed |= IEEE80211_RC_NSS_CHANGED;
1098
1099                 drv_sta_rc_update(local, sdata, &sta->sta, changed);
1100         }
1101
1102         rcu_read_unlock();
1103 }
1104
1105 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1106                                   struct ieee80211_mgmt *mgmt, size_t len,
1107                                   struct ieee80211_rx_status *rx_status,
1108                                   struct ieee802_11_elems *elems)
1109 {
1110         struct ieee80211_local *local = sdata->local;
1111         struct cfg80211_bss *cbss;
1112         struct ieee80211_bss *bss;
1113         struct ieee80211_channel *channel;
1114         u64 beacon_timestamp, rx_timestamp;
1115         u32 supp_rates = 0;
1116         enum ieee80211_band band = rx_status->band;
1117
1118         channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
1119         if (!channel)
1120                 return;
1121
1122         ieee80211_update_sta_info(sdata, mgmt, len, rx_status, elems, channel);
1123
1124         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1125                                         channel);
1126         if (!bss)
1127                 return;
1128
1129         cbss = container_of((void *)bss, struct cfg80211_bss, priv);
1130
1131         /* same for beacon and probe response */
1132         beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp);
1133
1134         /* check if we need to merge IBSS */
1135
1136         /* not an IBSS */
1137         if (!(cbss->capability & WLAN_CAPABILITY_IBSS))
1138                 goto put_bss;
1139
1140         /* different channel */
1141         if (sdata->u.ibss.fixed_channel &&
1142             sdata->u.ibss.chandef.chan != cbss->channel)
1143                 goto put_bss;
1144
1145         /* different SSID */
1146         if (elems->ssid_len != sdata->u.ibss.ssid_len ||
1147             memcmp(elems->ssid, sdata->u.ibss.ssid,
1148                                 sdata->u.ibss.ssid_len))
1149                 goto put_bss;
1150
1151         /* process channel switch */
1152         if (sdata->vif.csa_active ||
1153             ieee80211_ibss_process_chanswitch(sdata, elems, true))
1154                 goto put_bss;
1155
1156         /* same BSSID */
1157         if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid))
1158                 goto put_bss;
1159
1160         /* we use a fixed BSSID */
1161         if (sdata->u.ibss.fixed_bssid)
1162                 goto put_bss;
1163
1164         if (ieee80211_have_rx_timestamp(rx_status)) {
1165                 /* time when timestamp field was received */
1166                 rx_timestamp =
1167                         ieee80211_calculate_rx_timestamp(local, rx_status,
1168                                                          len + FCS_LEN, 24);
1169         } else {
1170                 /*
1171                  * second best option: get current TSF
1172                  * (will return -1 if not supported)
1173                  */
1174                 rx_timestamp = drv_get_tsf(local, sdata);
1175         }
1176
1177         ibss_dbg(sdata, "RX beacon SA=%pM BSSID=%pM TSF=0x%llx\n",
1178                  mgmt->sa, mgmt->bssid,
1179                  (unsigned long long)rx_timestamp);
1180         ibss_dbg(sdata, "\tBCN=0x%llx diff=%lld @%lu\n",
1181                  (unsigned long long)beacon_timestamp,
1182                  (unsigned long long)(rx_timestamp - beacon_timestamp),
1183                  jiffies);
1184
1185         if (beacon_timestamp > rx_timestamp) {
1186                 ibss_dbg(sdata,
1187                          "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n",
1188                          mgmt->bssid);
1189                 ieee80211_sta_join_ibss(sdata, bss);
1190                 supp_rates = ieee80211_sta_get_rates(sdata, elems, band, NULL);
1191                 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa,
1192                                        supp_rates);
1193                 rcu_read_unlock();
1194         }
1195
1196  put_bss:
1197         ieee80211_rx_bss_put(local, bss);
1198 }
1199
1200 void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata,
1201                               const u8 *bssid, const u8 *addr,
1202                               u32 supp_rates)
1203 {
1204         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1205         struct ieee80211_local *local = sdata->local;
1206         struct sta_info *sta;
1207         struct ieee80211_chanctx_conf *chanctx_conf;
1208         struct ieee80211_supported_band *sband;
1209         enum nl80211_bss_scan_width scan_width;
1210         int band;
1211
1212         /*
1213          * XXX: Consider removing the least recently used entry and
1214          *      allow new one to be added.
1215          */
1216         if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
1217                 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
1218                                     sdata->name, addr);
1219                 return;
1220         }
1221
1222         if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH)
1223                 return;
1224
1225         if (!ether_addr_equal(bssid, sdata->u.ibss.bssid))
1226                 return;
1227
1228         rcu_read_lock();
1229         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1230         if (WARN_ON_ONCE(!chanctx_conf)) {
1231                 rcu_read_unlock();
1232                 return;
1233         }
1234         band = chanctx_conf->def.chan->band;
1235         scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
1236         rcu_read_unlock();
1237
1238         sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
1239         if (!sta)
1240                 return;
1241
1242         sta->rx_stats.last_rx = jiffies;
1243
1244         /* make sure mandatory rates are always added */
1245         sband = local->hw.wiphy->bands[band];
1246         sta->sta.supp_rates[band] = supp_rates |
1247                         ieee80211_mandatory_rates(sband, scan_width);
1248
1249         spin_lock(&ifibss->incomplete_lock);
1250         list_add(&sta->list, &ifibss->incomplete_stations);
1251         spin_unlock(&ifibss->incomplete_lock);
1252         ieee80211_queue_work(&local->hw, &sdata->work);
1253 }
1254
1255 static void ieee80211_ibss_sta_expire(struct ieee80211_sub_if_data *sdata)
1256 {
1257         struct ieee80211_local *local = sdata->local;
1258         struct sta_info *sta, *tmp;
1259         unsigned long exp_time = IEEE80211_IBSS_INACTIVITY_LIMIT;
1260         unsigned long exp_rsn = IEEE80211_IBSS_RSN_INACTIVITY_LIMIT;
1261
1262         mutex_lock(&local->sta_mtx);
1263
1264         list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
1265                 if (sdata != sta->sdata)
1266                         continue;
1267
1268                 if (time_after(jiffies, sta->rx_stats.last_rx + exp_time) ||
1269                     (time_after(jiffies, sta->rx_stats.last_rx + exp_rsn) &&
1270                      sta->sta_state != IEEE80211_STA_AUTHORIZED)) {
1271                         sta_dbg(sta->sdata, "expiring inactive %sSTA %pM\n",
1272                                 sta->sta_state != IEEE80211_STA_AUTHORIZED ?
1273                                 "not authorized " : "", sta->sta.addr);
1274
1275                         WARN_ON(__sta_info_destroy(sta));
1276                 }
1277         }
1278
1279         mutex_unlock(&local->sta_mtx);
1280 }
1281
1282 /*
1283  * This function is called with state == IEEE80211_IBSS_MLME_JOINED
1284  */
1285
1286 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
1287 {
1288         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1289         enum nl80211_bss_scan_width scan_width;
1290
1291         sdata_assert_lock(sdata);
1292
1293         mod_timer(&ifibss->timer,
1294                   round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
1295
1296         ieee80211_ibss_sta_expire(sdata);
1297
1298         if (time_before(jiffies, ifibss->last_scan_completed +
1299                        IEEE80211_IBSS_MERGE_INTERVAL))
1300                 return;
1301
1302         if (ieee80211_sta_active_ibss(sdata))
1303                 return;
1304
1305         if (ifibss->fixed_channel)
1306                 return;
1307
1308         sdata_info(sdata,
1309                    "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n");
1310
1311         scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
1312         ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len,
1313                                     NULL, 0, scan_width);
1314 }
1315
1316 static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
1317 {
1318         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1319         u8 bssid[ETH_ALEN];
1320         u16 capability;
1321         int i;
1322
1323         sdata_assert_lock(sdata);
1324
1325         if (ifibss->fixed_bssid) {
1326                 memcpy(bssid, ifibss->bssid, ETH_ALEN);
1327         } else {
1328                 /* Generate random, not broadcast, locally administered BSSID. Mix in
1329                  * own MAC address to make sure that devices that do not have proper
1330                  * random number generator get different BSSID. */
1331                 get_random_bytes(bssid, ETH_ALEN);
1332                 for (i = 0; i < ETH_ALEN; i++)
1333                         bssid[i] ^= sdata->vif.addr[i];
1334                 bssid[0] &= ~0x01;
1335                 bssid[0] |= 0x02;
1336         }
1337
1338         sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid);
1339
1340         capability = WLAN_CAPABILITY_IBSS;
1341
1342         if (ifibss->privacy)
1343                 capability |= WLAN_CAPABILITY_PRIVACY;
1344
1345         __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int,
1346                                   &ifibss->chandef, ifibss->basic_rates,
1347                                   capability, 0, true);
1348 }
1349
1350 static unsigned ibss_setup_channels(struct wiphy *wiphy,
1351                                     struct ieee80211_channel **channels,
1352                                     unsigned int channels_max,
1353                                     u32 center_freq, u32 width)
1354 {
1355         struct ieee80211_channel *chan = NULL;
1356         unsigned int n_chan = 0;
1357         u32 start_freq, end_freq, freq;
1358
1359         if (width <= 20) {
1360                 start_freq = center_freq;
1361                 end_freq = center_freq;
1362         } else {
1363                 start_freq = center_freq - width / 2 + 10;
1364                 end_freq = center_freq + width / 2 - 10;
1365         }
1366
1367         for (freq = start_freq; freq <= end_freq; freq += 20) {
1368                 chan = ieee80211_get_channel(wiphy, freq);
1369                 if (!chan)
1370                         continue;
1371                 if (n_chan >= channels_max)
1372                         return n_chan;
1373
1374                 channels[n_chan] = chan;
1375                 n_chan++;
1376         }
1377
1378         return n_chan;
1379 }
1380
1381 static unsigned int
1382 ieee80211_ibss_setup_scan_channels(struct wiphy *wiphy,
1383                                    const struct cfg80211_chan_def *chandef,
1384                                    struct ieee80211_channel **channels,
1385                                    unsigned int channels_max)
1386 {
1387         unsigned int n_chan = 0;
1388         u32 width, cf1, cf2 = 0;
1389
1390         switch (chandef->width) {
1391         case NL80211_CHAN_WIDTH_40:
1392                 width = 40;
1393                 break;
1394         case NL80211_CHAN_WIDTH_80P80:
1395                 cf2 = chandef->center_freq2;
1396                 /* fall through */
1397         case NL80211_CHAN_WIDTH_80:
1398                 width = 80;
1399                 break;
1400         case NL80211_CHAN_WIDTH_160:
1401                 width = 160;
1402                 break;
1403         default:
1404                 width = 20;
1405                 break;
1406         }
1407
1408         cf1 = chandef->center_freq1;
1409
1410         n_chan = ibss_setup_channels(wiphy, channels, channels_max, cf1, width);
1411
1412         if (cf2)
1413                 n_chan += ibss_setup_channels(wiphy, &channels[n_chan],
1414                                               channels_max - n_chan, cf2,
1415                                               width);
1416
1417         return n_chan;
1418 }
1419
1420 /*
1421  * This function is called with state == IEEE80211_IBSS_MLME_SEARCH
1422  */
1423
1424 static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
1425 {
1426         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1427         struct ieee80211_local *local = sdata->local;
1428         struct cfg80211_bss *cbss;
1429         struct ieee80211_channel *chan = NULL;
1430         const u8 *bssid = NULL;
1431         enum nl80211_bss_scan_width scan_width;
1432         int active_ibss;
1433
1434         sdata_assert_lock(sdata);
1435
1436         active_ibss = ieee80211_sta_active_ibss(sdata);
1437         ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss);
1438
1439         if (active_ibss)
1440                 return;
1441
1442         if (ifibss->fixed_bssid)
1443                 bssid = ifibss->bssid;
1444         if (ifibss->fixed_channel)
1445                 chan = ifibss->chandef.chan;
1446         if (!is_zero_ether_addr(ifibss->bssid))
1447                 bssid = ifibss->bssid;
1448         cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid,
1449                                 ifibss->ssid, ifibss->ssid_len,
1450                                 IEEE80211_BSS_TYPE_IBSS,
1451                                 IEEE80211_PRIVACY(ifibss->privacy));
1452
1453         if (cbss) {
1454                 struct ieee80211_bss *bss;
1455
1456                 bss = (void *)cbss->priv;
1457                 ibss_dbg(sdata,
1458                          "sta_find_ibss: selected %pM current %pM\n",
1459                          cbss->bssid, ifibss->bssid);
1460                 sdata_info(sdata,
1461                            "Selected IBSS BSSID %pM based on configured SSID\n",
1462                            cbss->bssid);
1463
1464                 ieee80211_sta_join_ibss(sdata, bss);
1465                 ieee80211_rx_bss_put(local, bss);
1466                 return;
1467         }
1468
1469         /* if a fixed bssid and a fixed freq have been provided create the IBSS
1470          * directly and do not waste time scanning
1471          */
1472         if (ifibss->fixed_bssid && ifibss->fixed_channel) {
1473                 sdata_info(sdata, "Created IBSS using preconfigured BSSID %pM\n",
1474                            bssid);
1475                 ieee80211_sta_create_ibss(sdata);
1476                 return;
1477         }
1478
1479
1480         ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n");
1481
1482         /* Selected IBSS not found in current scan results - try to scan */
1483         if (time_after(jiffies, ifibss->last_scan_completed +
1484                                         IEEE80211_SCAN_INTERVAL)) {
1485                 struct ieee80211_channel *channels[8];
1486                 unsigned int num;
1487
1488                 sdata_info(sdata, "Trigger new scan to find an IBSS to join\n");
1489
1490                 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
1491
1492                 if (ifibss->fixed_channel) {
1493                         num = ieee80211_ibss_setup_scan_channels(local->hw.wiphy,
1494                                                                  &ifibss->chandef,
1495                                                                  channels,
1496                                                                  ARRAY_SIZE(channels));
1497                         ieee80211_request_ibss_scan(sdata, ifibss->ssid,
1498                                                     ifibss->ssid_len, channels,
1499                                                     num, scan_width);
1500                 } else {
1501                         ieee80211_request_ibss_scan(sdata, ifibss->ssid,
1502                                                     ifibss->ssid_len, NULL,
1503                                                     0, scan_width);
1504                 }
1505         } else {
1506                 int interval = IEEE80211_SCAN_INTERVAL;
1507
1508                 if (time_after(jiffies, ifibss->ibss_join_req +
1509                                IEEE80211_IBSS_JOIN_TIMEOUT))
1510                         ieee80211_sta_create_ibss(sdata);
1511
1512                 mod_timer(&ifibss->timer,
1513                           round_jiffies(jiffies + interval));
1514         }
1515 }
1516
1517 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
1518                                         struct sk_buff *req)
1519 {
1520         struct ieee80211_mgmt *mgmt = (void *)req->data;
1521         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1522         struct ieee80211_local *local = sdata->local;
1523         int tx_last_beacon, len = req->len;
1524         struct sk_buff *skb;
1525         struct beacon_data *presp;
1526         u8 *pos, *end;
1527
1528         sdata_assert_lock(sdata);
1529
1530         presp = rcu_dereference_protected(ifibss->presp,
1531                                           lockdep_is_held(&sdata->wdev.mtx));
1532
1533         if (ifibss->state != IEEE80211_IBSS_MLME_JOINED ||
1534             len < 24 + 2 || !presp)
1535                 return;
1536
1537         tx_last_beacon = drv_tx_last_beacon(local);
1538
1539         ibss_dbg(sdata, "RX ProbeReq SA=%pM DA=%pM\n", mgmt->sa, mgmt->da);
1540         ibss_dbg(sdata, "\tBSSID=%pM (tx_last_beacon=%d)\n",
1541                  mgmt->bssid, tx_last_beacon);
1542
1543         if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da))
1544                 return;
1545
1546         if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) &&
1547             !is_broadcast_ether_addr(mgmt->bssid))
1548                 return;
1549
1550         end = ((u8 *) mgmt) + len;
1551         pos = mgmt->u.probe_req.variable;
1552         if (pos[0] != WLAN_EID_SSID ||
1553             pos + 2 + pos[1] > end) {
1554                 ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n",
1555                          mgmt->sa);
1556                 return;
1557         }
1558         if (pos[1] != 0 &&
1559             (pos[1] != ifibss->ssid_len ||
1560              memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) {
1561                 /* Ignore ProbeReq for foreign SSID */
1562                 return;
1563         }
1564
1565         /* Reply with ProbeResp */
1566         skb = dev_alloc_skb(local->tx_headroom + presp->head_len);
1567         if (!skb)
1568                 return;
1569
1570         skb_reserve(skb, local->tx_headroom);
1571         memcpy(skb_put(skb, presp->head_len), presp->head, presp->head_len);
1572
1573         memcpy(((struct ieee80211_mgmt *) skb->data)->da, mgmt->sa, ETH_ALEN);
1574         ibss_dbg(sdata, "Sending ProbeResp to %pM\n", mgmt->sa);
1575         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1576
1577         /* avoid excessive retries for probe request to wildcard SSIDs */
1578         if (pos[1] == 0)
1579                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_NO_ACK;
1580
1581         ieee80211_tx_skb(sdata, skb);
1582 }
1583
1584 static
1585 void ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data *sdata,
1586                                     struct ieee80211_mgmt *mgmt, size_t len,
1587                                     struct ieee80211_rx_status *rx_status)
1588 {
1589         size_t baselen;
1590         struct ieee802_11_elems elems;
1591
1592         BUILD_BUG_ON(offsetof(typeof(mgmt->u.probe_resp), variable) !=
1593                      offsetof(typeof(mgmt->u.beacon), variable));
1594
1595         /*
1596          * either beacon or probe_resp but the variable field is at the
1597          * same offset
1598          */
1599         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1600         if (baselen > len)
1601                 return;
1602
1603         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1604                                false, &elems);
1605
1606         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
1607 }
1608
1609 void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1610                                    struct sk_buff *skb)
1611 {
1612         struct ieee80211_rx_status *rx_status;
1613         struct ieee80211_mgmt *mgmt;
1614         u16 fc;
1615         struct ieee802_11_elems elems;
1616         int ies_len;
1617
1618         rx_status = IEEE80211_SKB_RXCB(skb);
1619         mgmt = (struct ieee80211_mgmt *) skb->data;
1620         fc = le16_to_cpu(mgmt->frame_control);
1621
1622         sdata_lock(sdata);
1623
1624         if (!sdata->u.ibss.ssid_len)
1625                 goto mgmt_out; /* not ready to merge yet */
1626
1627         switch (fc & IEEE80211_FCTL_STYPE) {
1628         case IEEE80211_STYPE_PROBE_REQ:
1629                 ieee80211_rx_mgmt_probe_req(sdata, skb);
1630                 break;
1631         case IEEE80211_STYPE_PROBE_RESP:
1632         case IEEE80211_STYPE_BEACON:
1633                 ieee80211_rx_mgmt_probe_beacon(sdata, mgmt, skb->len,
1634                                                rx_status);
1635                 break;
1636         case IEEE80211_STYPE_AUTH:
1637                 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len);
1638                 break;
1639         case IEEE80211_STYPE_DEAUTH:
1640                 ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len);
1641                 break;
1642         case IEEE80211_STYPE_ACTION:
1643                 switch (mgmt->u.action.category) {
1644                 case WLAN_CATEGORY_SPECTRUM_MGMT:
1645                         ies_len = skb->len -
1646                                   offsetof(struct ieee80211_mgmt,
1647                                            u.action.u.chan_switch.variable);
1648
1649                         if (ies_len < 0)
1650                                 break;
1651
1652                         ieee802_11_parse_elems(
1653                                 mgmt->u.action.u.chan_switch.variable,
1654                                 ies_len, true, &elems);
1655
1656                         if (elems.parse_error)
1657                                 break;
1658
1659                         ieee80211_rx_mgmt_spectrum_mgmt(sdata, mgmt, skb->len,
1660                                                         rx_status, &elems);
1661                         break;
1662                 }
1663         }
1664
1665  mgmt_out:
1666         sdata_unlock(sdata);
1667 }
1668
1669 void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata)
1670 {
1671         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1672         struct sta_info *sta;
1673
1674         sdata_lock(sdata);
1675
1676         /*
1677          * Work could be scheduled after scan or similar
1678          * when we aren't even joined (or trying) with a
1679          * network.
1680          */
1681         if (!ifibss->ssid_len)
1682                 goto out;
1683
1684         spin_lock_bh(&ifibss->incomplete_lock);
1685         while (!list_empty(&ifibss->incomplete_stations)) {
1686                 sta = list_first_entry(&ifibss->incomplete_stations,
1687                                        struct sta_info, list);
1688                 list_del(&sta->list);
1689                 spin_unlock_bh(&ifibss->incomplete_lock);
1690
1691                 ieee80211_ibss_finish_sta(sta);
1692                 rcu_read_unlock();
1693                 spin_lock_bh(&ifibss->incomplete_lock);
1694         }
1695         spin_unlock_bh(&ifibss->incomplete_lock);
1696
1697         switch (ifibss->state) {
1698         case IEEE80211_IBSS_MLME_SEARCH:
1699                 ieee80211_sta_find_ibss(sdata);
1700                 break;
1701         case IEEE80211_IBSS_MLME_JOINED:
1702                 ieee80211_sta_merge_ibss(sdata);
1703                 break;
1704         default:
1705                 WARN_ON(1);
1706                 break;
1707         }
1708
1709  out:
1710         sdata_unlock(sdata);
1711 }
1712
1713 static void ieee80211_ibss_timer(unsigned long data)
1714 {
1715         struct ieee80211_sub_if_data *sdata =
1716                 (struct ieee80211_sub_if_data *) data;
1717
1718         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1719 }
1720
1721 void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata)
1722 {
1723         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1724
1725         setup_timer(&ifibss->timer, ieee80211_ibss_timer,
1726                     (unsigned long) sdata);
1727         INIT_LIST_HEAD(&ifibss->incomplete_stations);
1728         spin_lock_init(&ifibss->incomplete_lock);
1729         INIT_WORK(&ifibss->csa_connection_drop_work,
1730                   ieee80211_csa_connection_drop_work);
1731 }
1732
1733 /* scan finished notification */
1734 void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local)
1735 {
1736         struct ieee80211_sub_if_data *sdata;
1737
1738         mutex_lock(&local->iflist_mtx);
1739         list_for_each_entry(sdata, &local->interfaces, list) {
1740                 if (!ieee80211_sdata_running(sdata))
1741                         continue;
1742                 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
1743                         continue;
1744                 sdata->u.ibss.last_scan_completed = jiffies;
1745         }
1746         mutex_unlock(&local->iflist_mtx);
1747 }
1748
1749 int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
1750                         struct cfg80211_ibss_params *params)
1751 {
1752         u32 changed = 0;
1753         u32 rate_flags;
1754         struct ieee80211_supported_band *sband;
1755         enum ieee80211_chanctx_mode chanmode;
1756         struct ieee80211_local *local = sdata->local;
1757         int radar_detect_width = 0;
1758         int i;
1759         int ret;
1760
1761         ret = cfg80211_chandef_dfs_required(local->hw.wiphy,
1762                                             &params->chandef,
1763                                             sdata->wdev.iftype);
1764         if (ret < 0)
1765                 return ret;
1766
1767         if (ret > 0) {
1768                 if (!params->userspace_handles_dfs)
1769                         return -EINVAL;
1770                 radar_detect_width = BIT(params->chandef.width);
1771         }
1772
1773         chanmode = (params->channel_fixed && !ret) ?
1774                 IEEE80211_CHANCTX_SHARED : IEEE80211_CHANCTX_EXCLUSIVE;
1775
1776         mutex_lock(&local->chanctx_mtx);
1777         ret = ieee80211_check_combinations(sdata, &params->chandef, chanmode,
1778                                            radar_detect_width);
1779         mutex_unlock(&local->chanctx_mtx);
1780         if (ret < 0)
1781                 return ret;
1782
1783         if (params->bssid) {
1784                 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN);
1785                 sdata->u.ibss.fixed_bssid = true;
1786         } else
1787                 sdata->u.ibss.fixed_bssid = false;
1788
1789         sdata->u.ibss.privacy = params->privacy;
1790         sdata->u.ibss.control_port = params->control_port;
1791         sdata->u.ibss.userspace_handles_dfs = params->userspace_handles_dfs;
1792         sdata->u.ibss.basic_rates = params->basic_rates;
1793         sdata->u.ibss.last_scan_completed = jiffies;
1794
1795         /* fix basic_rates if channel does not support these rates */
1796         rate_flags = ieee80211_chandef_rate_flags(&params->chandef);
1797         sband = local->hw.wiphy->bands[params->chandef.chan->band];
1798         for (i = 0; i < sband->n_bitrates; i++) {
1799                 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
1800                         sdata->u.ibss.basic_rates &= ~BIT(i);
1801         }
1802         memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate,
1803                sizeof(params->mcast_rate));
1804
1805         sdata->vif.bss_conf.beacon_int = params->beacon_interval;
1806
1807         sdata->u.ibss.chandef = params->chandef;
1808         sdata->u.ibss.fixed_channel = params->channel_fixed;
1809
1810         if (params->ie) {
1811                 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len,
1812                                            GFP_KERNEL);
1813                 if (sdata->u.ibss.ie)
1814                         sdata->u.ibss.ie_len = params->ie_len;
1815         }
1816
1817         sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
1818         sdata->u.ibss.ibss_join_req = jiffies;
1819
1820         memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len);
1821         sdata->u.ibss.ssid_len = params->ssid_len;
1822
1823         memcpy(&sdata->u.ibss.ht_capa, &params->ht_capa,
1824                sizeof(sdata->u.ibss.ht_capa));
1825         memcpy(&sdata->u.ibss.ht_capa_mask, &params->ht_capa_mask,
1826                sizeof(sdata->u.ibss.ht_capa_mask));
1827
1828         /*
1829          * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is
1830          * reserved, but an HT STA shall protect HT transmissions as though
1831          * the HT Protection field were set to non-HT mixed mode.
1832          *
1833          * In an IBSS, the RIFS Mode field of the HT Operation element is
1834          * also reserved, but an HT STA shall operate as though this field
1835          * were set to 1.
1836          */
1837
1838         sdata->vif.bss_conf.ht_operation_mode |=
1839                   IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED
1840                 | IEEE80211_HT_PARAM_RIFS_MODE;
1841
1842         changed |= BSS_CHANGED_HT;
1843         ieee80211_bss_info_change_notify(sdata, changed);
1844
1845         sdata->smps_mode = IEEE80211_SMPS_OFF;
1846         sdata->needed_rx_chains = local->rx_chains;
1847
1848         ieee80211_queue_work(&local->hw, &sdata->work);
1849
1850         return 0;
1851 }
1852
1853 int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata)
1854 {
1855         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1856
1857         ieee80211_ibss_disconnect(sdata);
1858         ifibss->ssid_len = 0;
1859         eth_zero_addr(ifibss->bssid);
1860
1861         /* remove beacon */
1862         kfree(sdata->u.ibss.ie);
1863
1864         /* on the next join, re-program HT parameters */
1865         memset(&ifibss->ht_capa, 0, sizeof(ifibss->ht_capa));
1866         memset(&ifibss->ht_capa_mask, 0, sizeof(ifibss->ht_capa_mask));
1867
1868         synchronize_rcu();
1869
1870         skb_queue_purge(&sdata->skb_queue);
1871
1872         del_timer_sync(&sdata->u.ibss.timer);
1873
1874         return 0;
1875 }