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 == NL80211_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 == NL80211_BAND_5GHZ;
 352         bss_change |= BSS_CHANGED_ERP_SLOT;
 353
 354         /* cf. IEEE 802.11 9.2.12 */
 355         if (chan->band == NL80211_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_NO_HT);
 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_NO_HT);
 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 = WLAN_CAPABILITY_IBSS;
 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                 unsigned long last_active = ieee80211_sta_last_active(sta);
 672
 673                 if (sta->sdata == sdata &&
 674                     time_is_after_jiffies(last_active +
 675                                           IEEE80211_IBSS_MERGE_INTERVAL)) {
 676                         active++;
 677                         break;
 678                 }
 679         }
 680
 681         rcu_read_unlock();
 682
 683         return active;
 684 }
 685
 686 static void ieee80211_ibss_disconnect(struct ieee80211_sub_if_data *sdata)
 687 {
 688         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 689         struct ieee80211_local *local = sdata->local;
 690         struct cfg80211_bss *cbss;
 691         struct beacon_data *presp;
 692         struct sta_info *sta;
 693
 694         if (!is_zero_ether_addr(ifibss->bssid)) {
 695                 cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->chandef.chan,
 696                                         ifibss->bssid, ifibss->ssid,
 697                                         ifibss->ssid_len,
 698                                         IEEE80211_BSS_TYPE_IBSS,
 699                                         IEEE80211_PRIVACY(ifibss->privacy));
 700
 701                 if (cbss) {
 702                         cfg80211_unlink_bss(local->hw.wiphy, cbss);
 703                         cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
 704                 }
 705         }
 706
 707         ifibss->state = IEEE80211_IBSS_MLME_SEARCH;
 708
 709         sta_info_flush(sdata);
 710
 711         spin_lock_bh(&ifibss->incomplete_lock);
 712         while (!list_empty(&ifibss->incomplete_stations)) {
 713                 sta = list_first_entry(&ifibss->incomplete_stations,
 714                                        struct sta_info, list);
 715                 list_del(&sta->list);
 716                 spin_unlock_bh(&ifibss->incomplete_lock);
 717
 718                 sta_info_free(local, sta);
 719                 spin_lock_bh(&ifibss->incomplete_lock);
 720         }
 721         spin_unlock_bh(&ifibss->incomplete_lock);
 722
 723         netif_carrier_off(sdata->dev);
 724
 725         sdata->vif.bss_conf.ibss_joined = false;
 726         sdata->vif.bss_conf.ibss_creator = false;
 727         sdata->vif.bss_conf.enable_beacon = false;
 728         sdata->vif.bss_conf.ssid_len = 0;
 729
 730         /* remove beacon */
 731         presp = rcu_dereference_protected(ifibss->presp,
 732                                           lockdep_is_held(&sdata->wdev.mtx));
 733         RCU_INIT_POINTER(sdata->u.ibss.presp, NULL);
 734         if (presp)
 735                 kfree_rcu(presp, rcu_head);
 736
 737         clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state);
 738         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED |
 739                                                 BSS_CHANGED_IBSS);
 740         drv_leave_ibss(local, sdata);
 741         mutex_lock(&local->mtx);
 742         ieee80211_vif_release_channel(sdata);
 743         mutex_unlock(&local->mtx);
 744 }
 745
 746 static void ieee80211_csa_connection_drop_work(struct work_struct *work)
 747 {
 748         struct ieee80211_sub_if_data *sdata =
 749                 container_of(work, struct ieee80211_sub_if_data,
 750                              u.ibss.csa_connection_drop_work);
 751
 752         sdata_lock(sdata);
 753
 754         ieee80211_ibss_disconnect(sdata);
 755         synchronize_rcu();
 756         skb_queue_purge(&sdata->skb_queue);
 757
 758         /* trigger a scan to find another IBSS network to join */
 759         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
 760
 761         sdata_unlock(sdata);
 762 }
 763
 764 static void ieee80211_ibss_csa_mark_radar(struct ieee80211_sub_if_data *sdata)
 765 {
 766         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 767         int err;
 768
 769         /* if the current channel is a DFS channel, mark the channel as
 770          * unavailable.
 771          */
 772         err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
 773                                             &ifibss->chandef,
 774                                             NL80211_IFTYPE_ADHOC);
 775         if (err > 0)
 776                 cfg80211_radar_event(sdata->local->hw.wiphy, &ifibss->chandef,
 777                                      GFP_ATOMIC);
 778 }
 779
 780 static bool
 781 ieee80211_ibss_process_chanswitch(struct ieee80211_sub_if_data *sdata,
 782                                   struct ieee802_11_elems *elems,
 783                                   bool beacon)
 784 {
 785         struct cfg80211_csa_settings params;
 786         struct ieee80211_csa_ie csa_ie;
 787         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 788         enum nl80211_channel_type ch_type;
 789         int err;
 790         u32 sta_flags;
 791
 792         sdata_assert_lock(sdata);
 793
 794         sta_flags = IEEE80211_STA_DISABLE_VHT;
 795         switch (ifibss->chandef.width) {
 796         case NL80211_CHAN_WIDTH_5:
 797         case NL80211_CHAN_WIDTH_10:
 798         case NL80211_CHAN_WIDTH_20_NOHT:
 799                 sta_flags |= IEEE80211_STA_DISABLE_HT;
 800                 /* fall through */
 801         case NL80211_CHAN_WIDTH_20:
 802                 sta_flags |= IEEE80211_STA_DISABLE_40MHZ;
 803                 break;
 804         default:
 805                 break;
 806         }
 807
 808         memset(&params, 0, sizeof(params));
 809         memset(&csa_ie, 0, sizeof(csa_ie));
 810         err = ieee80211_parse_ch_switch_ie(sdata, elems,
 811                                            ifibss->chandef.chan->band,
 812                                            sta_flags, ifibss->bssid, &csa_ie);
 813         /* can't switch to destination channel, fail */
 814         if (err < 0)
 815                 goto disconnect;
 816
 817         /* did not contain a CSA */
 818         if (err)
 819                 return false;
 820
 821         /* channel switch is not supported, disconnect */
 822         if (!(sdata->local->hw.wiphy->flags & WIPHY_FLAG_HAS_CHANNEL_SWITCH))
 823                 goto disconnect;
 824
 825         params.count = csa_ie.count;
 826         params.chandef = csa_ie.chandef;
 827
 828         switch (ifibss->chandef.width) {
 829         case NL80211_CHAN_WIDTH_20_NOHT:
 830         case NL80211_CHAN_WIDTH_20:
 831         case NL80211_CHAN_WIDTH_40:
 832                 /* keep our current HT mode (HT20/HT40+/HT40-), even if
 833                  * another mode  has been announced. The mode is not adopted
 834                  * within the beacon while doing CSA and we should therefore
 835                  * keep the mode which we announce.
 836                  */
 837                 ch_type = cfg80211_get_chandef_type(&ifibss->chandef);
 838                 cfg80211_chandef_create(&params.chandef, params.chandef.chan,
 839                                         ch_type);
 840                 break;
 841         case NL80211_CHAN_WIDTH_5:
 842         case NL80211_CHAN_WIDTH_10:
 843                 if (params.chandef.width != ifibss->chandef.width) {
 844                         sdata_info(sdata,
 845                                    "IBSS %pM received channel switch from incompatible channel width (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
 846                                    ifibss->bssid,
 847                                    params.chandef.chan->center_freq,
 848                                    params.chandef.width,
 849                                    params.chandef.center_freq1,
 850                                    params.chandef.center_freq2);
 851                         goto disconnect;
 852                 }
 853                 break;
 854         default:
 855                 /* should not happen, sta_flags should prevent VHT modes. */
 856                 WARN_ON(1);
 857                 goto disconnect;
 858         }
 859
 860         if (!cfg80211_reg_can_beacon(sdata->local->hw.wiphy, &params.chandef,
 861                                      NL80211_IFTYPE_ADHOC)) {
 862                 sdata_info(sdata,
 863                            "IBSS %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
 864                            ifibss->bssid,
 865                            params.chandef.chan->center_freq,
 866                            params.chandef.width,
 867                            params.chandef.center_freq1,
 868                            params.chandef.center_freq2);
 869                 goto disconnect;
 870         }
 871
 872         err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
 873                                             &params.chandef,
 874                                             NL80211_IFTYPE_ADHOC);
 875         if (err < 0)
 876                 goto disconnect;
 877         if (err > 0 && !ifibss->userspace_handles_dfs) {
 878                 /* IBSS-DFS only allowed with a control program */
 879                 goto disconnect;
 880         }
 881
 882         params.radar_required = err;
 883
 884         if (cfg80211_chandef_identical(&params.chandef,
 885                                        &sdata->vif.bss_conf.chandef)) {
 886                 ibss_dbg(sdata,
 887                          "received csa with an identical chandef, ignoring\n");
 888                 return true;
 889         }
 890
 891         /* all checks done, now perform the channel switch. */
 892         ibss_dbg(sdata,
 893                  "received channel switch announcement to go to channel %d MHz\n",
 894                  params.chandef.chan->center_freq);
 895
 896         params.block_tx = !!csa_ie.mode;
 897
 898         if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev,
 899                                      &params))
 900                 goto disconnect;
 901
 902         ieee80211_ibss_csa_mark_radar(sdata);
 903
 904         return true;
 905 disconnect:
 906         ibss_dbg(sdata, "Can't handle channel switch, disconnect\n");
 907         ieee80211_queue_work(&sdata->local->hw,
 908                              &ifibss->csa_connection_drop_work);
 909
 910         ieee80211_ibss_csa_mark_radar(sdata);
 911
 912         return true;
 913 }
 914
 915 static void
 916 ieee80211_rx_mgmt_spectrum_mgmt(struct ieee80211_sub_if_data *sdata,
 917                                 struct ieee80211_mgmt *mgmt, size_t len,
 918                                 struct ieee80211_rx_status *rx_status,
 919                                 struct ieee802_11_elems *elems)
 920 {
 921         int required_len;
 922
 923         if (len < IEEE80211_MIN_ACTION_SIZE + 1)
 924                 return;
 925
 926         /* CSA is the only action we handle for now */
 927         if (mgmt->u.action.u.measurement.action_code !=
 928             WLAN_ACTION_SPCT_CHL_SWITCH)
 929                 return;
 930
 931         required_len = IEEE80211_MIN_ACTION_SIZE +
 932                        sizeof(mgmt->u.action.u.chan_switch);
 933         if (len < required_len)
 934                 return;
 935
 936         if (!sdata->vif.csa_active)
 937                 ieee80211_ibss_process_chanswitch(sdata, elems, false);
 938 }
 939
 940 static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data *sdata,
 941                                           struct ieee80211_mgmt *mgmt,
 942                                           size_t len)
 943 {
 944         u16 reason = le16_to_cpu(mgmt->u.deauth.reason_code);
 945
 946         if (len < IEEE80211_DEAUTH_FRAME_LEN)
 947                 return;
 948
 949         ibss_dbg(sdata, "RX DeAuth SA=%pM DA=%pM BSSID=%pM (reason: %d)\n",
 950                  mgmt->sa, mgmt->da, mgmt->bssid, reason);
 951         sta_info_destroy_addr(sdata, mgmt->sa);
 952 }
 953
 954 static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata,
 955                                         struct ieee80211_mgmt *mgmt,
 956                                         size_t len)
 957 {
 958         u16 auth_alg, auth_transaction;
 959
 960         sdata_assert_lock(sdata);
 961
 962         if (len < 24 + 6)
 963                 return;
 964
 965         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
 966         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
 967
 968         ibss_dbg(sdata,
 969                  "RX Auth SA=%pM DA=%pM BSSID=%pM (auth_transaction=%d)\n",
 970                  mgmt->sa, mgmt->da, mgmt->bssid, auth_transaction);
 971
 972         if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
 973                 return;
 974
 975         /*
 976          * IEEE 802.11 standard does not require authentication in IBSS
 977          * networks and most implementations do not seem to use it.
 978          * However, try to reply to authentication attempts if someone
 979          * has actually implemented this.
 980          */
 981         ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, 0, NULL, 0,
 982                             mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0, 0);
 983 }
 984
 985 static void ieee80211_update_sta_info(struct ieee80211_sub_if_data *sdata,
 986                                       struct ieee80211_mgmt *mgmt, size_t len,
 987                                       struct ieee80211_rx_status *rx_status,
 988                                       struct ieee802_11_elems *elems,
 989                                       struct ieee80211_channel *channel)
 990 {
 991         struct sta_info *sta;
 992         enum nl80211_band band = rx_status->band;
 993         enum nl80211_bss_scan_width scan_width;
 994         struct ieee80211_local *local = sdata->local;
 995         struct ieee80211_supported_band *sband;
 996         bool rates_updated = false;
 997         u32 supp_rates = 0;
 998
 999         if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
1000                 return;
1001
1002         if (!ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid))
1003                 return;
1004
1005         sband = local->hw.wiphy->bands[band];
1006         if (WARN_ON(!sband))
1007                 return;
1008
1009         rcu_read_lock();
1010         sta = sta_info_get(sdata, mgmt->sa);
1011
1012         if (elems->supp_rates) {
1013                 supp_rates = ieee80211_sta_get_rates(sdata, elems,
1014                                                      band, NULL);
1015                 if (sta) {
1016                         u32 prev_rates;
1017
1018                         prev_rates = sta->sta.supp_rates[band];
1019                         /* make sure mandatory rates are always added */
1020                         scan_width = NL80211_BSS_CHAN_WIDTH_20;
1021                         if (rx_status->bw == RATE_INFO_BW_5)
1022                                 scan_width = NL80211_BSS_CHAN_WIDTH_5;
1023                         else if (rx_status->bw == RATE_INFO_BW_10)
1024                                 scan_width = NL80211_BSS_CHAN_WIDTH_10;
1025
1026                         sta->sta.supp_rates[band] = supp_rates |
1027                                 ieee80211_mandatory_rates(sband, scan_width);
1028                         if (sta->sta.supp_rates[band] != prev_rates) {
1029                                 ibss_dbg(sdata,
1030                                          "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n",
1031                                          sta->sta.addr, prev_rates,
1032                                          sta->sta.supp_rates[band]);
1033                                 rates_updated = true;
1034                         }
1035                 } else {
1036                         rcu_read_unlock();
1037                         sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid,
1038                                                      mgmt->sa, supp_rates);
1039                 }
1040         }
1041
1042         if (sta && !sta->sta.wme &&
1043             elems->wmm_info && local->hw.queues >= IEEE80211_NUM_ACS) {
1044                 sta->sta.wme = true;
1045                 ieee80211_check_fast_xmit(sta);
1046         }
1047
1048         if (sta && elems->ht_operation && elems->ht_cap_elem &&
1049             sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20_NOHT &&
1050             sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_5 &&
1051             sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_10) {
1052                 /* we both use HT */
1053                 struct ieee80211_ht_cap htcap_ie;
1054                 struct cfg80211_chan_def chandef;
1055                 enum ieee80211_sta_rx_bandwidth bw = sta->sta.bandwidth;
1056
1057                 cfg80211_chandef_create(&chandef, channel, NL80211_CHAN_NO_HT);
1058                 ieee80211_chandef_ht_oper(elems->ht_operation, &chandef);
1059
1060                 memcpy(&htcap_ie, elems->ht_cap_elem, sizeof(htcap_ie));
1061                 rates_updated |= ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
1062                                                                    &htcap_ie,
1063                                                                    sta);
1064
1065                 if (elems->vht_operation && elems->vht_cap_elem &&
1066                     sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20 &&
1067                     sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_40) {
1068                         /* we both use VHT */
1069                         struct ieee80211_vht_cap cap_ie;
1070                         struct ieee80211_sta_vht_cap cap = sta->sta.vht_cap;
1071
1072                         ieee80211_chandef_vht_oper(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 nl80211_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,
1178                  "RX beacon SA=%pM BSSID=%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
1179                  mgmt->sa, mgmt->bssid,
1180                  (unsigned long long)rx_timestamp,
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         /* make sure mandatory rates are always added */
1243         sband = local->hw.wiphy->bands[band];
1244         sta->sta.supp_rates[band] = supp_rates |
1245                         ieee80211_mandatory_rates(sband, scan_width);
1246
1247         spin_lock(&ifibss->incomplete_lock);
1248         list_add(&sta->list, &ifibss->incomplete_stations);
1249         spin_unlock(&ifibss->incomplete_lock);
1250         ieee80211_queue_work(&local->hw, &sdata->work);
1251 }
1252
1253 static void ieee80211_ibss_sta_expire(struct ieee80211_sub_if_data *sdata)
1254 {
1255         struct ieee80211_local *local = sdata->local;
1256         struct sta_info *sta, *tmp;
1257         unsigned long exp_time = IEEE80211_IBSS_INACTIVITY_LIMIT;
1258         unsigned long exp_rsn = IEEE80211_IBSS_RSN_INACTIVITY_LIMIT;
1259
1260         mutex_lock(&local->sta_mtx);
1261
1262         list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
1263                 unsigned long last_active = ieee80211_sta_last_active(sta);
1264
1265                 if (sdata != sta->sdata)
1266                         continue;
1267
1268                 if (time_is_before_jiffies(last_active + exp_time) ||
1269                     (time_is_before_jiffies(last_active + 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,
1540                  "RX ProbeReq SA=%pM DA=%pM BSSID=%pM (tx_last_beacon=%d)\n",
1541                  mgmt->sa, mgmt->da, 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 }