net/mac80211/ibss.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * IBSS mode implementation
   4  * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
   5  * Copyright 2004, Instant802 Networks, Inc.
   6  * Copyright 2005, Devicescape Software, Inc.
   7  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   8  * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
   9  * Copyright 2009, Johannes Berg <johannes@sipsolutions.net>
  10  * Copyright 2013-2014  Intel Mobile Communications GmbH
  11  * Copyright(c) 2016 Intel Deutschland GmbH
  12  * Copyright(c) 2018-2022 Intel Corporation
  13  */
  14
  15 #include <linux/delay.h>
  16 #include <linux/slab.h>
  17 #include <linux/if_ether.h>
  18 #include <linux/skbuff.h>
  19 #include <linux/if_arp.h>
  20 #include <linux/etherdevice.h>
  21 #include <linux/rtnetlink.h>
  22 #include <net/mac80211.h>
  23
  24 #include "ieee80211_i.h"
  25 #include "driver-ops.h"
  26 #include "rate.h"
  27
  28 #define IEEE80211_SCAN_INTERVAL (2 * HZ)
  29 #define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ)
  30
  31 #define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ)
  32 #define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ)
  33 #define IEEE80211_IBSS_RSN_INACTIVITY_LIMIT (10 * HZ)
  34
  35 #define IEEE80211_IBSS_MAX_STA_ENTRIES 128
  36
  37 static struct beacon_data *
  38 ieee80211_ibss_build_presp(struct ieee80211_sub_if_data *sdata,
  39                            const int beacon_int, const u32 basic_rates,
  40                            const u16 capability, u64 tsf,
  41                            struct cfg80211_chan_def *chandef,
  42                            bool *have_higher_than_11mbit,
  43                            struct cfg80211_csa_settings *csa_settings)
  44 {
  45         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
  46         struct ieee80211_local *local = sdata->local;
  47         int rates_n = 0, i, ri;
  48         struct ieee80211_mgmt *mgmt;
  49         u8 *pos;
  50         struct ieee80211_supported_band *sband;
  51         u32 rate_flags, rates = 0, rates_added = 0;
  52         struct beacon_data *presp;
  53         int frame_len;
  54         int shift;
  55
  56         /* Build IBSS probe response */
  57         frame_len = sizeof(struct ieee80211_hdr_3addr) +
  58                     12 /* struct ieee80211_mgmt.u.beacon */ +
  59                     2 + IEEE80211_MAX_SSID_LEN /* max SSID */ +
  60                     2 + 8 /* max Supported Rates */ +
  61                     3 /* max DS params */ +
  62                     4 /* IBSS params */ +
  63                     5 /* Channel Switch Announcement */ +
  64                     2 + (IEEE80211_MAX_SUPP_RATES - 8) +
  65                     2 + sizeof(struct ieee80211_ht_cap) +
  66                     2 + sizeof(struct ieee80211_ht_operation) +
  67                     2 + sizeof(struct ieee80211_vht_cap) +
  68                     2 + sizeof(struct ieee80211_vht_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->cntdwn_counter_offsets[0] = (pos - presp->head);
 149                 *pos++ = csa_settings->count;
 150                 presp->cntdwn_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.cfg.ibss_joined) {
 248                 sdata->vif.cfg.ibss_joined = false;
 249                 sdata->vif.cfg.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_link_use_channel(sdata->link[0], &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->deflink.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.cfg.ssid_len = ifibss->ssid_len;
 330         memcpy(sdata->vif.cfg.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.cfg.ibss_joined = true;
 363         sdata->vif.cfg.ibss_creator = creator;
 364
 365         err = drv_join_ibss(local, sdata);
 366         if (err) {
 367                 sdata->vif.cfg.ibss_joined = false;
 368                 sdata->vif.cfg.ibss_creator = false;
 369                 sdata->vif.bss_conf.enable_beacon = false;
 370                 sdata->vif.cfg.ssid_len = 0;
 371                 RCU_INIT_POINTER(ifibss->presp, NULL);
 372                 kfree_rcu(presp, rcu_head);
 373                 mutex_lock(&local->mtx);
 374                 ieee80211_link_release_channel(sdata->link[0]);
 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
 493         sdata_assert_lock(sdata);
 494
 495         if (ifibss->privacy)
 496                 capability |= WLAN_CAPABILITY_PRIVACY;
 497
 498         cbss = cfg80211_get_bss(sdata->local->hw.wiphy, ifibss->chandef.chan,
 499                                 ifibss->bssid, ifibss->ssid,
 500                                 ifibss->ssid_len, IEEE80211_BSS_TYPE_IBSS,
 501                                 IEEE80211_PRIVACY(ifibss->privacy));
 502
 503         if (WARN_ON(!cbss))
 504                 return -EINVAL;
 505
 506         rcu_read_lock();
 507         ies = rcu_dereference(cbss->ies);
 508         tsf = ies->tsf;
 509         rcu_read_unlock();
 510         cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
 511
 512         old_presp = rcu_dereference_protected(ifibss->presp,
 513                                           lockdep_is_held(&sdata->wdev.mtx));
 514
 515         presp = ieee80211_ibss_build_presp(sdata,
 516                                            sdata->vif.bss_conf.beacon_int,
 517                                            sdata->vif.bss_conf.basic_rates,
 518                                            capability, tsf, &ifibss->chandef,
 519                                            NULL, csa_settings);
 520         if (!presp)
 521                 return -ENOMEM;
 522
 523         rcu_assign_pointer(ifibss->presp, presp);
 524         if (old_presp)
 525                 kfree_rcu(old_presp, rcu_head);
 526
 527         return BSS_CHANGED_BEACON;
 528 }
 529
 530 int ieee80211_ibss_finish_csa(struct ieee80211_sub_if_data *sdata)
 531 {
 532         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 533         struct cfg80211_bss *cbss;
 534
 535         sdata_assert_lock(sdata);
 536
 537         /* update cfg80211 bss information with the new channel */
 538         if (!is_zero_ether_addr(ifibss->bssid)) {
 539                 cbss = cfg80211_get_bss(sdata->local->hw.wiphy,
 540                                         ifibss->chandef.chan,
 541                                         ifibss->bssid, ifibss->ssid,
 542                                         ifibss->ssid_len,
 543                                         IEEE80211_BSS_TYPE_IBSS,
 544                                         IEEE80211_PRIVACY(ifibss->privacy));
 545                 /* XXX: should not really modify cfg80211 data */
 546                 if (cbss) {
 547                         cbss->channel = sdata->deflink.csa_chandef.chan;
 548                         cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
 549                 }
 550         }
 551
 552         ifibss->chandef = sdata->deflink.csa_chandef;
 553
 554         /* generate the beacon */
 555         return ieee80211_ibss_csa_beacon(sdata, NULL);
 556 }
 557
 558 void ieee80211_ibss_stop(struct ieee80211_sub_if_data *sdata)
 559 {
 560         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 561
 562         cancel_work_sync(&ifibss->csa_connection_drop_work);
 563 }
 564
 565 static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta)
 566         __acquires(RCU)
 567 {
 568         struct ieee80211_sub_if_data *sdata = sta->sdata;
 569         u8 addr[ETH_ALEN];
 570
 571         memcpy(addr, sta->sta.addr, ETH_ALEN);
 572
 573         ibss_dbg(sdata, "Adding new IBSS station %pM\n", addr);
 574
 575         sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
 576         sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
 577         /* authorize the station only if the network is not RSN protected. If
 578          * not wait for the userspace to authorize it */
 579         if (!sta->sdata->u.ibss.control_port)
 580                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
 581
 582         rate_control_rate_init(sta);
 583
 584         /* If it fails, maybe we raced another insertion? */
 585         if (sta_info_insert_rcu(sta))
 586                 return sta_info_get(sdata, addr);
 587         return sta;
 588 }
 589
 590 static struct sta_info *
 591 ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, const u8 *bssid,
 592                        const u8 *addr, u32 supp_rates)
 593         __acquires(RCU)
 594 {
 595         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 596         struct ieee80211_local *local = sdata->local;
 597         struct sta_info *sta;
 598         struct ieee80211_chanctx_conf *chanctx_conf;
 599         struct ieee80211_supported_band *sband;
 600         enum nl80211_bss_scan_width scan_width;
 601         int band;
 602
 603         /*
 604          * XXX: Consider removing the least recently used entry and
 605          *      allow new one to be added.
 606          */
 607         if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
 608                 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
 609                                     sdata->name, addr);
 610                 rcu_read_lock();
 611                 return NULL;
 612         }
 613
 614         if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) {
 615                 rcu_read_lock();
 616                 return NULL;
 617         }
 618
 619         if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) {
 620                 rcu_read_lock();
 621                 return NULL;
 622         }
 623
 624         rcu_read_lock();
 625         chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
 626         if (WARN_ON_ONCE(!chanctx_conf))
 627                 return NULL;
 628         band = chanctx_conf->def.chan->band;
 629         scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
 630         rcu_read_unlock();
 631
 632         sta = sta_info_alloc(sdata, addr, -1, GFP_KERNEL);
 633         if (!sta) {
 634                 rcu_read_lock();
 635                 return NULL;
 636         }
 637
 638         /* make sure mandatory rates are always added */
 639         sband = local->hw.wiphy->bands[band];
 640         sta->sta.deflink.supp_rates[band] = supp_rates |
 641                         ieee80211_mandatory_rates(sband, scan_width);
 642
 643         return ieee80211_ibss_finish_sta(sta);
 644 }
 645
 646 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
 647 {
 648         struct ieee80211_local *local = sdata->local;
 649         int active = 0;
 650         struct sta_info *sta;
 651
 652         sdata_assert_lock(sdata);
 653
 654         rcu_read_lock();
 655
 656         list_for_each_entry_rcu(sta, &local->sta_list, list) {
 657                 unsigned long last_active = ieee80211_sta_last_active(sta);
 658
 659                 if (sta->sdata == sdata &&
 660                     time_is_after_jiffies(last_active +
 661                                           IEEE80211_IBSS_MERGE_INTERVAL)) {
 662                         active++;
 663                         break;
 664                 }
 665         }
 666
 667         rcu_read_unlock();
 668
 669         return active;
 670 }
 671
 672 static void ieee80211_ibss_disconnect(struct ieee80211_sub_if_data *sdata)
 673 {
 674         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 675         struct ieee80211_local *local = sdata->local;
 676         struct cfg80211_bss *cbss;
 677         struct beacon_data *presp;
 678         struct sta_info *sta;
 679
 680         if (!is_zero_ether_addr(ifibss->bssid)) {
 681                 cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->chandef.chan,
 682                                         ifibss->bssid, ifibss->ssid,
 683                                         ifibss->ssid_len,
 684                                         IEEE80211_BSS_TYPE_IBSS,
 685                                         IEEE80211_PRIVACY(ifibss->privacy));
 686
 687                 if (cbss) {
 688                         cfg80211_unlink_bss(local->hw.wiphy, cbss);
 689                         cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
 690                 }
 691         }
 692
 693         ifibss->state = IEEE80211_IBSS_MLME_SEARCH;
 694
 695         sta_info_flush(sdata);
 696
 697         spin_lock_bh(&ifibss->incomplete_lock);
 698         while (!list_empty(&ifibss->incomplete_stations)) {
 699                 sta = list_first_entry(&ifibss->incomplete_stations,
 700                                        struct sta_info, list);
 701                 list_del(&sta->list);
 702                 spin_unlock_bh(&ifibss->incomplete_lock);
 703
 704                 sta_info_free(local, sta);
 705                 spin_lock_bh(&ifibss->incomplete_lock);
 706         }
 707         spin_unlock_bh(&ifibss->incomplete_lock);
 708
 709         netif_carrier_off(sdata->dev);
 710
 711         sdata->vif.cfg.ibss_joined = false;
 712         sdata->vif.cfg.ibss_creator = false;
 713         sdata->vif.bss_conf.enable_beacon = false;
 714         sdata->vif.cfg.ssid_len = 0;
 715
 716         /* remove beacon */
 717         presp = rcu_dereference_protected(ifibss->presp,
 718                                           lockdep_is_held(&sdata->wdev.mtx));
 719         RCU_INIT_POINTER(sdata->u.ibss.presp, NULL);
 720         if (presp)
 721                 kfree_rcu(presp, rcu_head);
 722
 723         clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state);
 724         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED |
 725                                                 BSS_CHANGED_IBSS);
 726         drv_leave_ibss(local, sdata);
 727         mutex_lock(&local->mtx);
 728         ieee80211_link_release_channel(sdata->link[0]);
 729         mutex_unlock(&local->mtx);
 730 }
 731
 732 static void ieee80211_csa_connection_drop_work(struct work_struct *work)
 733 {
 734         struct ieee80211_sub_if_data *sdata =
 735                 container_of(work, struct ieee80211_sub_if_data,
 736                              u.ibss.csa_connection_drop_work);
 737
 738         sdata_lock(sdata);
 739
 740         ieee80211_ibss_disconnect(sdata);
 741         synchronize_rcu();
 742         skb_queue_purge(&sdata->skb_queue);
 743
 744         /* trigger a scan to find another IBSS network to join */
 745         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
 746
 747         sdata_unlock(sdata);
 748 }
 749
 750 static void ieee80211_ibss_csa_mark_radar(struct ieee80211_sub_if_data *sdata)
 751 {
 752         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 753         int err;
 754
 755         /* if the current channel is a DFS channel, mark the channel as
 756          * unavailable.
 757          */
 758         err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
 759                                             &ifibss->chandef,
 760                                             NL80211_IFTYPE_ADHOC);
 761         if (err > 0)
 762                 cfg80211_radar_event(sdata->local->hw.wiphy, &ifibss->chandef,
 763                                      GFP_ATOMIC);
 764 }
 765
 766 static bool
 767 ieee80211_ibss_process_chanswitch(struct ieee80211_sub_if_data *sdata,
 768                                   struct ieee802_11_elems *elems,
 769                                   bool beacon)
 770 {
 771         struct cfg80211_csa_settings params;
 772         struct ieee80211_csa_ie csa_ie;
 773         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 774         enum nl80211_channel_type ch_type;
 775         int err;
 776         u32 sta_flags;
 777         u32 vht_cap_info = 0;
 778
 779         sdata_assert_lock(sdata);
 780
 781         sta_flags = IEEE80211_STA_DISABLE_VHT;
 782         switch (ifibss->chandef.width) {
 783         case NL80211_CHAN_WIDTH_5:
 784         case NL80211_CHAN_WIDTH_10:
 785         case NL80211_CHAN_WIDTH_20_NOHT:
 786                 sta_flags |= IEEE80211_STA_DISABLE_HT;
 787                 fallthrough;
 788         case NL80211_CHAN_WIDTH_20:
 789                 sta_flags |= IEEE80211_STA_DISABLE_40MHZ;
 790                 break;
 791         default:
 792                 break;
 793         }
 794
 795         if (elems->vht_cap_elem)
 796                 vht_cap_info = le32_to_cpu(elems->vht_cap_elem->vht_cap_info);
 797
 798         memset(&params, 0, sizeof(params));
 799         err = ieee80211_parse_ch_switch_ie(sdata, elems,
 800                                            ifibss->chandef.chan->band,
 801                                            vht_cap_info,
 802                                            sta_flags, ifibss->bssid, &csa_ie);
 803         /* can't switch to destination channel, fail */
 804         if (err < 0)
 805                 goto disconnect;
 806
 807         /* did not contain a CSA */
 808         if (err)
 809                 return false;
 810
 811         /* channel switch is not supported, disconnect */
 812         if (!(sdata->local->hw.wiphy->flags & WIPHY_FLAG_HAS_CHANNEL_SWITCH))
 813                 goto disconnect;
 814
 815         params.count = csa_ie.count;
 816         params.chandef = csa_ie.chandef;
 817
 818         switch (ifibss->chandef.width) {
 819         case NL80211_CHAN_WIDTH_20_NOHT:
 820         case NL80211_CHAN_WIDTH_20:
 821         case NL80211_CHAN_WIDTH_40:
 822                 /* keep our current HT mode (HT20/HT40+/HT40-), even if
 823                  * another mode  has been announced. The mode is not adopted
 824                  * within the beacon while doing CSA and we should therefore
 825                  * keep the mode which we announce.
 826                  */
 827                 ch_type = cfg80211_get_chandef_type(&ifibss->chandef);
 828                 cfg80211_chandef_create(&params.chandef, params.chandef.chan,
 829                                         ch_type);
 830                 break;
 831         case NL80211_CHAN_WIDTH_5:
 832         case NL80211_CHAN_WIDTH_10:
 833                 if (params.chandef.width != ifibss->chandef.width) {
 834                         sdata_info(sdata,
 835                                    "IBSS %pM received channel switch from incompatible channel width (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
 836                                    ifibss->bssid,
 837                                    params.chandef.chan->center_freq,
 838                                    params.chandef.width,
 839                                    params.chandef.center_freq1,
 840                                    params.chandef.center_freq2);
 841                         goto disconnect;
 842                 }
 843                 break;
 844         default:
 845                 /* should not happen, sta_flags should prevent VHT modes. */
 846                 WARN_ON(1);
 847                 goto disconnect;
 848         }
 849
 850         if (!cfg80211_reg_can_beacon(sdata->local->hw.wiphy, &params.chandef,
 851                                      NL80211_IFTYPE_ADHOC)) {
 852                 sdata_info(sdata,
 853                            "IBSS %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
 854                            ifibss->bssid,
 855                            params.chandef.chan->center_freq,
 856                            params.chandef.width,
 857                            params.chandef.center_freq1,
 858                            params.chandef.center_freq2);
 859                 goto disconnect;
 860         }
 861
 862         err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
 863                                             &params.chandef,
 864                                             NL80211_IFTYPE_ADHOC);
 865         if (err < 0)
 866                 goto disconnect;
 867         if (err > 0 && !ifibss->userspace_handles_dfs) {
 868                 /* IBSS-DFS only allowed with a control program */
 869                 goto disconnect;
 870         }
 871
 872         params.radar_required = err;
 873
 874         if (cfg80211_chandef_identical(&params.chandef,
 875                                        &sdata->vif.bss_conf.chandef)) {
 876                 ibss_dbg(sdata,
 877                          "received csa with an identical chandef, ignoring\n");
 878                 return true;
 879         }
 880
 881         /* all checks done, now perform the channel switch. */
 882         ibss_dbg(sdata,
 883                  "received channel switch announcement to go to channel %d MHz\n",
 884                  params.chandef.chan->center_freq);
 885
 886         params.block_tx = !!csa_ie.mode;
 887
 888         if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev,
 889                                      &params))
 890                 goto disconnect;
 891
 892         ieee80211_ibss_csa_mark_radar(sdata);
 893
 894         return true;
 895 disconnect:
 896         ibss_dbg(sdata, "Can't handle channel switch, disconnect\n");
 897         ieee80211_queue_work(&sdata->local->hw,
 898                              &ifibss->csa_connection_drop_work);
 899
 900         ieee80211_ibss_csa_mark_radar(sdata);
 901
 902         return true;
 903 }
 904
 905 static void
 906 ieee80211_rx_mgmt_spectrum_mgmt(struct ieee80211_sub_if_data *sdata,
 907                                 struct ieee80211_mgmt *mgmt, size_t len,
 908                                 struct ieee80211_rx_status *rx_status,
 909                                 struct ieee802_11_elems *elems)
 910 {
 911         int required_len;
 912
 913         if (len < IEEE80211_MIN_ACTION_SIZE + 1)
 914                 return;
 915
 916         /* CSA is the only action we handle for now */
 917         if (mgmt->u.action.u.measurement.action_code !=
 918             WLAN_ACTION_SPCT_CHL_SWITCH)
 919                 return;
 920
 921         required_len = IEEE80211_MIN_ACTION_SIZE +
 922                        sizeof(mgmt->u.action.u.chan_switch);
 923         if (len < required_len)
 924                 return;
 925
 926         if (!sdata->vif.bss_conf.csa_active)
 927                 ieee80211_ibss_process_chanswitch(sdata, elems, false);
 928 }
 929
 930 static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data *sdata,
 931                                           struct ieee80211_mgmt *mgmt,
 932                                           size_t len)
 933 {
 934         u16 reason = le16_to_cpu(mgmt->u.deauth.reason_code);
 935
 936         if (len < IEEE80211_DEAUTH_FRAME_LEN)
 937                 return;
 938
 939         ibss_dbg(sdata, "RX DeAuth SA=%pM DA=%pM\n", mgmt->sa, mgmt->da);
 940         ibss_dbg(sdata, "\tBSSID=%pM (reason: %d)\n", mgmt->bssid, reason);
 941         sta_info_destroy_addr(sdata, mgmt->sa);
 942 }
 943
 944 static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata,
 945                                         struct ieee80211_mgmt *mgmt,
 946                                         size_t len)
 947 {
 948         u16 auth_alg, auth_transaction;
 949
 950         sdata_assert_lock(sdata);
 951
 952         if (len < 24 + 6)
 953                 return;
 954
 955         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
 956         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
 957
 958         ibss_dbg(sdata, "RX Auth SA=%pM DA=%pM\n", mgmt->sa, mgmt->da);
 959         ibss_dbg(sdata, "\tBSSID=%pM (auth_transaction=%d)\n",
 960                  mgmt->bssid, auth_transaction);
 961
 962         if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
 963                 return;
 964
 965         /*
 966          * IEEE 802.11 standard does not require authentication in IBSS
 967          * networks and most implementations do not seem to use it.
 968          * However, try to reply to authentication attempts if someone
 969          * has actually implemented this.
 970          */
 971         ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, 0, NULL, 0,
 972                             mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0, 0);
 973 }
 974
 975 static void ieee80211_update_sta_info(struct ieee80211_sub_if_data *sdata,
 976                                       struct ieee80211_mgmt *mgmt, size_t len,
 977                                       struct ieee80211_rx_status *rx_status,
 978                                       struct ieee802_11_elems *elems,
 979                                       struct ieee80211_channel *channel)
 980 {
 981         struct sta_info *sta;
 982         enum nl80211_band band = rx_status->band;
 983         enum nl80211_bss_scan_width scan_width;
 984         struct ieee80211_local *local = sdata->local;
 985         struct ieee80211_supported_band *sband;
 986         bool rates_updated = false;
 987         u32 supp_rates = 0;
 988
 989         if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
 990                 return;
 991
 992         if (!ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid))
 993                 return;
 994
 995         sband = local->hw.wiphy->bands[band];
 996         if (WARN_ON(!sband))
 997                 return;
 998
 999         rcu_read_lock();
1000         sta = sta_info_get(sdata, mgmt->sa);
1001
1002         if (elems->supp_rates) {
1003                 supp_rates = ieee80211_sta_get_rates(sdata, elems,
1004                                                      band, NULL);
1005                 if (sta) {
1006                         u32 prev_rates;
1007
1008                         prev_rates = sta->sta.deflink.supp_rates[band];
1009                         /* make sure mandatory rates are always added */
1010                         scan_width = NL80211_BSS_CHAN_WIDTH_20;
1011                         if (rx_status->bw == RATE_INFO_BW_5)
1012                                 scan_width = NL80211_BSS_CHAN_WIDTH_5;
1013                         else if (rx_status->bw == RATE_INFO_BW_10)
1014                                 scan_width = NL80211_BSS_CHAN_WIDTH_10;
1015
1016                         sta->sta.deflink.supp_rates[band] = supp_rates |
1017                                 ieee80211_mandatory_rates(sband, scan_width);
1018                         if (sta->sta.deflink.supp_rates[band] != prev_rates) {
1019                                 ibss_dbg(sdata,
1020                                          "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n",
1021                                          sta->sta.addr, prev_rates,
1022                                          sta->sta.deflink.supp_rates[band]);
1023                                 rates_updated = true;
1024                         }
1025                 } else {
1026                         rcu_read_unlock();
1027                         sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid,
1028                                                      mgmt->sa, supp_rates);
1029                 }
1030         }
1031
1032         if (sta && !sta->sta.wme &&
1033             (elems->wmm_info || elems->s1g_capab) &&
1034             local->hw.queues >= IEEE80211_NUM_ACS) {
1035                 sta->sta.wme = true;
1036                 ieee80211_check_fast_xmit(sta);
1037         }
1038
1039         if (sta && elems->ht_operation && elems->ht_cap_elem &&
1040             sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20_NOHT &&
1041             sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_5 &&
1042             sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_10) {
1043                 /* we both use HT */
1044                 struct ieee80211_ht_cap htcap_ie;
1045                 struct cfg80211_chan_def chandef;
1046                 enum ieee80211_sta_rx_bandwidth bw = sta->sta.deflink.bandwidth;
1047
1048                 cfg80211_chandef_create(&chandef, channel, NL80211_CHAN_NO_HT);
1049                 ieee80211_chandef_ht_oper(elems->ht_operation, &chandef);
1050
1051                 memcpy(&htcap_ie, elems->ht_cap_elem, sizeof(htcap_ie));
1052                 rates_updated |= ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
1053                                                                    &htcap_ie,
1054                                                                    &sta->deflink);
1055
1056                 if (elems->vht_operation && elems->vht_cap_elem &&
1057                     sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20 &&
1058                     sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_40) {
1059                         /* we both use VHT */
1060                         struct ieee80211_vht_cap cap_ie;
1061                         struct ieee80211_sta_vht_cap cap = sta->sta.deflink.vht_cap;
1062                         u32 vht_cap_info =
1063                                 le32_to_cpu(elems->vht_cap_elem->vht_cap_info);
1064
1065                         ieee80211_chandef_vht_oper(&local->hw, vht_cap_info,
1066                                                    elems->vht_operation,
1067                                                    elems->ht_operation,
1068                                                    &chandef);
1069                         memcpy(&cap_ie, elems->vht_cap_elem, sizeof(cap_ie));
1070                         ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
1071                                                             &cap_ie,
1072                                                             &sta->deflink);
1073                         if (memcmp(&cap, &sta->sta.deflink.vht_cap, sizeof(cap)))
1074                                 rates_updated |= true;
1075                 }
1076
1077                 if (bw != sta->sta.deflink.bandwidth)
1078                         rates_updated |= true;
1079
1080                 if (!cfg80211_chandef_compatible(&sdata->u.ibss.chandef,
1081                                                  &chandef))
1082                         WARN_ON_ONCE(1);
1083         }
1084
1085         if (sta && rates_updated) {
1086                 u32 changed = IEEE80211_RC_SUPP_RATES_CHANGED;
1087                 u8 rx_nss = sta->sta.deflink.rx_nss;
1088
1089                 /* Force rx_nss recalculation */
1090                 sta->sta.deflink.rx_nss = 0;
1091                 rate_control_rate_init(sta);
1092                 if (sta->sta.deflink.rx_nss != rx_nss)
1093                         changed |= IEEE80211_RC_NSS_CHANGED;
1094
1095                 drv_sta_rc_update(local, sdata, &sta->sta, changed);
1096         }
1097
1098         rcu_read_unlock();
1099 }
1100
1101 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1102                                   struct ieee80211_mgmt *mgmt, size_t len,
1103                                   struct ieee80211_rx_status *rx_status,
1104                                   struct ieee802_11_elems *elems)
1105 {
1106         struct ieee80211_local *local = sdata->local;
1107         struct cfg80211_bss *cbss;
1108         struct ieee80211_bss *bss;
1109         struct ieee80211_channel *channel;
1110         u64 beacon_timestamp, rx_timestamp;
1111         u32 supp_rates = 0;
1112         enum nl80211_band band = rx_status->band;
1113
1114         channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
1115         if (!channel)
1116                 return;
1117
1118         ieee80211_update_sta_info(sdata, mgmt, len, rx_status, elems, channel);
1119
1120         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, channel);
1121         if (!bss)
1122                 return;
1123
1124         cbss = container_of((void *)bss, struct cfg80211_bss, priv);
1125
1126         /* same for beacon and probe response */
1127         beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp);
1128
1129         /* check if we need to merge IBSS */
1130
1131         /* not an IBSS */
1132         if (!(cbss->capability & WLAN_CAPABILITY_IBSS))
1133                 goto put_bss;
1134
1135         /* different channel */
1136         if (sdata->u.ibss.fixed_channel &&
1137             sdata->u.ibss.chandef.chan != cbss->channel)
1138                 goto put_bss;
1139
1140         /* different SSID */
1141         if (elems->ssid_len != sdata->u.ibss.ssid_len ||
1142             memcmp(elems->ssid, sdata->u.ibss.ssid,
1143                                 sdata->u.ibss.ssid_len))
1144                 goto put_bss;
1145
1146         /* process channel switch */
1147         if (sdata->vif.bss_conf.csa_active ||
1148             ieee80211_ibss_process_chanswitch(sdata, elems, true))
1149                 goto put_bss;
1150
1151         /* same BSSID */
1152         if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid))
1153                 goto put_bss;
1154
1155         /* we use a fixed BSSID */
1156         if (sdata->u.ibss.fixed_bssid)
1157                 goto put_bss;
1158
1159         if (ieee80211_have_rx_timestamp(rx_status)) {
1160                 /* time when timestamp field was received */
1161                 rx_timestamp =
1162                         ieee80211_calculate_rx_timestamp(local, rx_status,
1163                                                          len + FCS_LEN, 24);
1164         } else {
1165                 /*
1166                  * second best option: get current TSF
1167                  * (will return -1 if not supported)
1168                  */
1169                 rx_timestamp = drv_get_tsf(local, sdata);
1170         }
1171
1172         ibss_dbg(sdata, "RX beacon SA=%pM BSSID=%pM TSF=0x%llx\n",
1173                  mgmt->sa, mgmt->bssid,
1174                  (unsigned long long)rx_timestamp);
1175         ibss_dbg(sdata, "\tBCN=0x%llx diff=%lld @%lu\n",
1176                  (unsigned long long)beacon_timestamp,
1177                  (unsigned long long)(rx_timestamp - beacon_timestamp),
1178                  jiffies);
1179
1180         if (beacon_timestamp > rx_timestamp) {
1181                 ibss_dbg(sdata,
1182                          "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n",
1183                          mgmt->bssid);
1184                 ieee80211_sta_join_ibss(sdata, bss);
1185                 supp_rates = ieee80211_sta_get_rates(sdata, elems, band, NULL);
1186                 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa,
1187                                        supp_rates);
1188                 rcu_read_unlock();
1189         }
1190
1191  put_bss:
1192         ieee80211_rx_bss_put(local, bss);
1193 }
1194
1195 void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata,
1196                               const u8 *bssid, const u8 *addr,
1197                               u32 supp_rates)
1198 {
1199         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1200         struct ieee80211_local *local = sdata->local;
1201         struct sta_info *sta;
1202         struct ieee80211_chanctx_conf *chanctx_conf;
1203         struct ieee80211_supported_band *sband;
1204         enum nl80211_bss_scan_width scan_width;
1205         int band;
1206
1207         /*
1208          * XXX: Consider removing the least recently used entry and
1209          *      allow new one to be added.
1210          */
1211         if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
1212                 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
1213                                     sdata->name, addr);
1214                 return;
1215         }
1216
1217         if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH)
1218                 return;
1219
1220         if (!ether_addr_equal(bssid, sdata->u.ibss.bssid))
1221                 return;
1222
1223         rcu_read_lock();
1224         chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
1225         if (WARN_ON_ONCE(!chanctx_conf)) {
1226                 rcu_read_unlock();
1227                 return;
1228         }
1229         band = chanctx_conf->def.chan->band;
1230         scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
1231         rcu_read_unlock();
1232
1233         sta = sta_info_alloc(sdata, addr, -1, GFP_ATOMIC);
1234         if (!sta)
1235                 return;
1236
1237         /* make sure mandatory rates are always added */
1238         sband = local->hw.wiphy->bands[band];
1239         sta->sta.deflink.supp_rates[band] = supp_rates |
1240                         ieee80211_mandatory_rates(sband, scan_width);
1241
1242         spin_lock(&ifibss->incomplete_lock);
1243         list_add(&sta->list, &ifibss->incomplete_stations);
1244         spin_unlock(&ifibss->incomplete_lock);
1245         ieee80211_queue_work(&local->hw, &sdata->work);
1246 }
1247
1248 static void ieee80211_ibss_sta_expire(struct ieee80211_sub_if_data *sdata)
1249 {
1250         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1251         struct ieee80211_local *local = sdata->local;
1252         struct sta_info *sta, *tmp;
1253         unsigned long exp_time = IEEE80211_IBSS_INACTIVITY_LIMIT;
1254         unsigned long exp_rsn = IEEE80211_IBSS_RSN_INACTIVITY_LIMIT;
1255
1256         mutex_lock(&local->sta_mtx);
1257
1258         list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
1259                 unsigned long last_active = ieee80211_sta_last_active(sta);
1260
1261                 if (sdata != sta->sdata)
1262                         continue;
1263
1264                 if (time_is_before_jiffies(last_active + exp_time) ||
1265                     (time_is_before_jiffies(last_active + exp_rsn) &&
1266                      sta->sta_state != IEEE80211_STA_AUTHORIZED)) {
1267                         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
1268
1269                         sta_dbg(sta->sdata, "expiring inactive %sSTA %pM\n",
1270                                 sta->sta_state != IEEE80211_STA_AUTHORIZED ?
1271                                 "not authorized " : "", sta->sta.addr);
1272
1273                         ieee80211_send_deauth_disassoc(sdata, sta->sta.addr,
1274                                                        ifibss->bssid,
1275                                                        IEEE80211_STYPE_DEAUTH,
1276                                                        WLAN_REASON_DEAUTH_LEAVING,
1277                                                        true, frame_buf);
1278                         WARN_ON(__sta_info_destroy(sta));
1279                 }
1280         }
1281
1282         mutex_unlock(&local->sta_mtx);
1283 }
1284
1285 /*
1286  * This function is called with state == IEEE80211_IBSS_MLME_JOINED
1287  */
1288
1289 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
1290 {
1291         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1292         enum nl80211_bss_scan_width scan_width;
1293
1294         sdata_assert_lock(sdata);
1295
1296         mod_timer(&ifibss->timer,
1297                   round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
1298
1299         ieee80211_ibss_sta_expire(sdata);
1300
1301         if (time_before(jiffies, ifibss->last_scan_completed +
1302                        IEEE80211_IBSS_MERGE_INTERVAL))
1303                 return;
1304
1305         if (ieee80211_sta_active_ibss(sdata))
1306                 return;
1307
1308         if (ifibss->fixed_channel)
1309                 return;
1310
1311         sdata_info(sdata,
1312                    "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n");
1313
1314         scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
1315         ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len,
1316                                     NULL, 0, scan_width);
1317 }
1318
1319 static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
1320 {
1321         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1322         u8 bssid[ETH_ALEN];
1323         u16 capability;
1324         int i;
1325
1326         sdata_assert_lock(sdata);
1327
1328         if (ifibss->fixed_bssid) {
1329                 memcpy(bssid, ifibss->bssid, ETH_ALEN);
1330         } else {
1331                 /* Generate random, not broadcast, locally administered BSSID. Mix in
1332                  * own MAC address to make sure that devices that do not have proper
1333                  * random number generator get different BSSID. */
1334                 get_random_bytes(bssid, ETH_ALEN);
1335                 for (i = 0; i < ETH_ALEN; i++)
1336                         bssid[i] ^= sdata->vif.addr[i];
1337                 bssid[0] &= ~0x01;
1338                 bssid[0] |= 0x02;
1339         }
1340
1341         sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid);
1342
1343         capability = WLAN_CAPABILITY_IBSS;
1344
1345         if (ifibss->privacy)
1346                 capability |= WLAN_CAPABILITY_PRIVACY;
1347
1348         __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int,
1349                                   &ifibss->chandef, ifibss->basic_rates,
1350                                   capability, 0, true);
1351 }
1352
1353 static unsigned ibss_setup_channels(struct wiphy *wiphy,
1354                                     struct ieee80211_channel **channels,
1355                                     unsigned int channels_max,
1356                                     u32 center_freq, u32 width)
1357 {
1358         struct ieee80211_channel *chan = NULL;
1359         unsigned int n_chan = 0;
1360         u32 start_freq, end_freq, freq;
1361
1362         if (width <= 20) {
1363                 start_freq = center_freq;
1364                 end_freq = center_freq;
1365         } else {
1366                 start_freq = center_freq - width / 2 + 10;
1367                 end_freq = center_freq + width / 2 - 10;
1368         }
1369
1370         for (freq = start_freq; freq <= end_freq; freq += 20) {
1371                 chan = ieee80211_get_channel(wiphy, freq);
1372                 if (!chan)
1373                         continue;
1374                 if (n_chan >= channels_max)
1375                         return n_chan;
1376
1377                 channels[n_chan] = chan;
1378                 n_chan++;
1379         }
1380
1381         return n_chan;
1382 }
1383
1384 static unsigned int
1385 ieee80211_ibss_setup_scan_channels(struct wiphy *wiphy,
1386                                    const struct cfg80211_chan_def *chandef,
1387                                    struct ieee80211_channel **channels,
1388                                    unsigned int channels_max)
1389 {
1390         unsigned int n_chan = 0;
1391         u32 width, cf1, cf2 = 0;
1392
1393         switch (chandef->width) {
1394         case NL80211_CHAN_WIDTH_40:
1395                 width = 40;
1396                 break;
1397         case NL80211_CHAN_WIDTH_80P80:
1398                 cf2 = chandef->center_freq2;
1399                 fallthrough;
1400         case NL80211_CHAN_WIDTH_80:
1401                 width = 80;
1402                 break;
1403         case NL80211_CHAN_WIDTH_160:
1404                 width = 160;
1405                 break;
1406         default:
1407                 width = 20;
1408                 break;
1409         }
1410
1411         cf1 = chandef->center_freq1;
1412
1413         n_chan = ibss_setup_channels(wiphy, channels, channels_max, cf1, width);
1414
1415         if (cf2)
1416                 n_chan += ibss_setup_channels(wiphy, &channels[n_chan],
1417                                               channels_max - n_chan, cf2,
1418                                               width);
1419
1420         return n_chan;
1421 }
1422
1423 /*
1424  * This function is called with state == IEEE80211_IBSS_MLME_SEARCH
1425  */
1426
1427 static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
1428 {
1429         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1430         struct ieee80211_local *local = sdata->local;
1431         struct cfg80211_bss *cbss;
1432         struct ieee80211_channel *chan = NULL;
1433         const u8 *bssid = NULL;
1434         enum nl80211_bss_scan_width scan_width;
1435         int active_ibss;
1436
1437         sdata_assert_lock(sdata);
1438
1439         active_ibss = ieee80211_sta_active_ibss(sdata);
1440         ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss);
1441
1442         if (active_ibss)
1443                 return;
1444
1445         if (ifibss->fixed_bssid)
1446                 bssid = ifibss->bssid;
1447         if (ifibss->fixed_channel)
1448                 chan = ifibss->chandef.chan;
1449         if (!is_zero_ether_addr(ifibss->bssid))
1450                 bssid = ifibss->bssid;
1451         cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid,
1452                                 ifibss->ssid, ifibss->ssid_len,
1453                                 IEEE80211_BSS_TYPE_IBSS,
1454                                 IEEE80211_PRIVACY(ifibss->privacy));
1455
1456         if (cbss) {
1457                 struct ieee80211_bss *bss;
1458
1459                 bss = (void *)cbss->priv;
1460                 ibss_dbg(sdata,
1461                          "sta_find_ibss: selected %pM current %pM\n",
1462                          cbss->bssid, ifibss->bssid);
1463                 sdata_info(sdata,
1464                            "Selected IBSS BSSID %pM based on configured SSID\n",
1465                            cbss->bssid);
1466
1467                 ieee80211_sta_join_ibss(sdata, bss);
1468                 ieee80211_rx_bss_put(local, bss);
1469                 return;
1470         }
1471
1472         /* if a fixed bssid and a fixed freq have been provided create the IBSS
1473          * directly and do not waste time scanning
1474          */
1475         if (ifibss->fixed_bssid && ifibss->fixed_channel) {
1476                 sdata_info(sdata, "Created IBSS using preconfigured BSSID %pM\n",
1477                            bssid);
1478                 ieee80211_sta_create_ibss(sdata);
1479                 return;
1480         }
1481
1482
1483         ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n");
1484
1485         /* Selected IBSS not found in current scan results - try to scan */
1486         if (time_after(jiffies, ifibss->last_scan_completed +
1487                                         IEEE80211_SCAN_INTERVAL)) {
1488                 struct ieee80211_channel *channels[8];
1489                 unsigned int num;
1490
1491                 sdata_info(sdata, "Trigger new scan to find an IBSS to join\n");
1492
1493                 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
1494
1495                 if (ifibss->fixed_channel) {
1496                         num = ieee80211_ibss_setup_scan_channels(local->hw.wiphy,
1497                                                                  &ifibss->chandef,
1498                                                                  channels,
1499                                                                  ARRAY_SIZE(channels));
1500                         ieee80211_request_ibss_scan(sdata, ifibss->ssid,
1501                                                     ifibss->ssid_len, channels,
1502                                                     num, scan_width);
1503                 } else {
1504                         ieee80211_request_ibss_scan(sdata, ifibss->ssid,
1505                                                     ifibss->ssid_len, NULL,
1506                                                     0, scan_width);
1507                 }
1508         } else {
1509                 int interval = IEEE80211_SCAN_INTERVAL;
1510
1511                 if (time_after(jiffies, ifibss->ibss_join_req +
1512                                IEEE80211_IBSS_JOIN_TIMEOUT))
1513                         ieee80211_sta_create_ibss(sdata);
1514
1515                 mod_timer(&ifibss->timer,
1516                           round_jiffies(jiffies + interval));
1517         }
1518 }
1519
1520 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
1521                                         struct sk_buff *req)
1522 {
1523         struct ieee80211_mgmt *mgmt = (void *)req->data;
1524         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1525         struct ieee80211_local *local = sdata->local;
1526         int tx_last_beacon, len = req->len;
1527         struct sk_buff *skb;
1528         struct beacon_data *presp;
1529         u8 *pos, *end;
1530
1531         sdata_assert_lock(sdata);
1532
1533         presp = rcu_dereference_protected(ifibss->presp,
1534                                           lockdep_is_held(&sdata->wdev.mtx));
1535
1536         if (ifibss->state != IEEE80211_IBSS_MLME_JOINED ||
1537             len < 24 + 2 || !presp)
1538                 return;
1539
1540         tx_last_beacon = drv_tx_last_beacon(local);
1541
1542         ibss_dbg(sdata, "RX ProbeReq SA=%pM DA=%pM\n", mgmt->sa, mgmt->da);
1543         ibss_dbg(sdata, "\tBSSID=%pM (tx_last_beacon=%d)\n",
1544                  mgmt->bssid, tx_last_beacon);
1545
1546         if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da))
1547                 return;
1548
1549         if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) &&
1550             !is_broadcast_ether_addr(mgmt->bssid))
1551                 return;
1552
1553         end = ((u8 *) mgmt) + len;
1554         pos = mgmt->u.probe_req.variable;
1555         if (pos[0] != WLAN_EID_SSID ||
1556             pos + 2 + pos[1] > end) {
1557                 ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n",
1558                          mgmt->sa);
1559                 return;
1560         }
1561         if (pos[1] != 0 &&
1562             (pos[1] != ifibss->ssid_len ||
1563              memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) {
1564                 /* Ignore ProbeReq for foreign SSID */
1565                 return;
1566         }
1567
1568         /* Reply with ProbeResp */
1569         skb = dev_alloc_skb(local->tx_headroom + presp->head_len);
1570         if (!skb)
1571                 return;
1572
1573         skb_reserve(skb, local->tx_headroom);
1574         skb_put_data(skb, presp->head, presp->head_len);
1575
1576         memcpy(((struct ieee80211_mgmt *) skb->data)->da, mgmt->sa, ETH_ALEN);
1577         ibss_dbg(sdata, "Sending ProbeResp to %pM\n", mgmt->sa);
1578         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1579
1580         /* avoid excessive retries for probe request to wildcard SSIDs */
1581         if (pos[1] == 0)
1582                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_NO_ACK;
1583
1584         ieee80211_tx_skb(sdata, skb);
1585 }
1586
1587 static
1588 void ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data *sdata,
1589                                     struct ieee80211_mgmt *mgmt, size_t len,
1590                                     struct ieee80211_rx_status *rx_status)
1591 {
1592         size_t baselen;
1593         struct ieee802_11_elems *elems;
1594
1595         BUILD_BUG_ON(offsetof(typeof(mgmt->u.probe_resp), variable) !=
1596                      offsetof(typeof(mgmt->u.beacon), variable));
1597
1598         /*
1599          * either beacon or probe_resp but the variable field is at the
1600          * same offset
1601          */
1602         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1603         if (baselen > len)
1604                 return;
1605
1606         elems = ieee802_11_parse_elems(mgmt->u.probe_resp.variable,
1607                                        len - baselen, false,
1608                                        mgmt->bssid, NULL);
1609
1610         if (elems) {
1611                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, elems);
1612                 kfree(elems);
1613         }
1614 }
1615
1616 void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1617                                    struct sk_buff *skb)
1618 {
1619         struct ieee80211_rx_status *rx_status;
1620         struct ieee80211_mgmt *mgmt;
1621         u16 fc;
1622         struct ieee802_11_elems *elems;
1623         int ies_len;
1624
1625         rx_status = IEEE80211_SKB_RXCB(skb);
1626         mgmt = (struct ieee80211_mgmt *) skb->data;
1627         fc = le16_to_cpu(mgmt->frame_control);
1628
1629         sdata_lock(sdata);
1630
1631         if (!sdata->u.ibss.ssid_len)
1632                 goto mgmt_out; /* not ready to merge yet */
1633
1634         switch (fc & IEEE80211_FCTL_STYPE) {
1635         case IEEE80211_STYPE_PROBE_REQ:
1636                 ieee80211_rx_mgmt_probe_req(sdata, skb);
1637                 break;
1638         case IEEE80211_STYPE_PROBE_RESP:
1639         case IEEE80211_STYPE_BEACON:
1640                 ieee80211_rx_mgmt_probe_beacon(sdata, mgmt, skb->len,
1641                                                rx_status);
1642                 break;
1643         case IEEE80211_STYPE_AUTH:
1644                 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len);
1645                 break;
1646         case IEEE80211_STYPE_DEAUTH:
1647                 ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len);
1648                 break;
1649         case IEEE80211_STYPE_ACTION:
1650                 switch (mgmt->u.action.category) {
1651                 case WLAN_CATEGORY_SPECTRUM_MGMT:
1652                         ies_len = skb->len -
1653                                   offsetof(struct ieee80211_mgmt,
1654                                            u.action.u.chan_switch.variable);
1655
1656                         if (ies_len < 0)
1657                                 break;
1658
1659                         elems = ieee802_11_parse_elems(
1660                                 mgmt->u.action.u.chan_switch.variable,
1661                                 ies_len, true, mgmt->bssid, NULL);
1662
1663                         if (elems && !elems->parse_error)
1664                                 ieee80211_rx_mgmt_spectrum_mgmt(sdata, mgmt,
1665                                                                 skb->len,
1666                                                                 rx_status,
1667                                                                 elems);
1668                         kfree(elems);
1669                         break;
1670                 }
1671         }
1672
1673  mgmt_out:
1674         sdata_unlock(sdata);
1675 }
1676
1677 void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata)
1678 {
1679         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1680         struct sta_info *sta;
1681
1682         sdata_lock(sdata);
1683
1684         /*
1685          * Work could be scheduled after scan or similar
1686          * when we aren't even joined (or trying) with a
1687          * network.
1688          */
1689         if (!ifibss->ssid_len)
1690                 goto out;
1691
1692         spin_lock_bh(&ifibss->incomplete_lock);
1693         while (!list_empty(&ifibss->incomplete_stations)) {
1694                 sta = list_first_entry(&ifibss->incomplete_stations,
1695                                        struct sta_info, list);
1696                 list_del(&sta->list);
1697                 spin_unlock_bh(&ifibss->incomplete_lock);
1698
1699                 ieee80211_ibss_finish_sta(sta);
1700                 rcu_read_unlock();
1701                 spin_lock_bh(&ifibss->incomplete_lock);
1702         }
1703         spin_unlock_bh(&ifibss->incomplete_lock);
1704
1705         switch (ifibss->state) {
1706         case IEEE80211_IBSS_MLME_SEARCH:
1707                 ieee80211_sta_find_ibss(sdata);
1708                 break;
1709         case IEEE80211_IBSS_MLME_JOINED:
1710                 ieee80211_sta_merge_ibss(sdata);
1711                 break;
1712         default:
1713                 WARN_ON(1);
1714                 break;
1715         }
1716
1717  out:
1718         sdata_unlock(sdata);
1719 }
1720
1721 static void ieee80211_ibss_timer(struct timer_list *t)
1722 {
1723         struct ieee80211_sub_if_data *sdata =
1724                 from_timer(sdata, t, u.ibss.timer);
1725
1726         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1727 }
1728
1729 void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata)
1730 {
1731         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1732
1733         timer_setup(&ifibss->timer, ieee80211_ibss_timer, 0);
1734         INIT_LIST_HEAD(&ifibss->incomplete_stations);
1735         spin_lock_init(&ifibss->incomplete_lock);
1736         INIT_WORK(&ifibss->csa_connection_drop_work,
1737                   ieee80211_csa_connection_drop_work);
1738 }
1739
1740 /* scan finished notification */
1741 void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local)
1742 {
1743         struct ieee80211_sub_if_data *sdata;
1744
1745         mutex_lock(&local->iflist_mtx);
1746         list_for_each_entry(sdata, &local->interfaces, list) {
1747                 if (!ieee80211_sdata_running(sdata))
1748                         continue;
1749                 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
1750                         continue;
1751                 sdata->u.ibss.last_scan_completed = jiffies;
1752         }
1753         mutex_unlock(&local->iflist_mtx);
1754 }
1755
1756 int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
1757                         struct cfg80211_ibss_params *params)
1758 {
1759         u32 changed = 0;
1760         u32 rate_flags;
1761         struct ieee80211_supported_band *sband;
1762         enum ieee80211_chanctx_mode chanmode;
1763         struct ieee80211_local *local = sdata->local;
1764         int radar_detect_width = 0;
1765         int i;
1766         int ret;
1767
1768         if (params->chandef.chan->freq_offset) {
1769                 /* this may work, but is untested */
1770                 return -EOPNOTSUPP;
1771         }
1772
1773         ret = cfg80211_chandef_dfs_required(local->hw.wiphy,
1774                                             &params->chandef,
1775                                             sdata->wdev.iftype);
1776         if (ret < 0)
1777                 return ret;
1778
1779         if (ret > 0) {
1780                 if (!params->userspace_handles_dfs)
1781                         return -EINVAL;
1782                 radar_detect_width = BIT(params->chandef.width);
1783         }
1784
1785         chanmode = (params->channel_fixed && !ret) ?
1786                 IEEE80211_CHANCTX_SHARED : IEEE80211_CHANCTX_EXCLUSIVE;
1787
1788         mutex_lock(&local->chanctx_mtx);
1789         ret = ieee80211_check_combinations(sdata, &params->chandef, chanmode,
1790                                            radar_detect_width);
1791         mutex_unlock(&local->chanctx_mtx);
1792         if (ret < 0)
1793                 return ret;
1794
1795         if (params->bssid) {
1796                 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN);
1797                 sdata->u.ibss.fixed_bssid = true;
1798         } else
1799                 sdata->u.ibss.fixed_bssid = false;
1800
1801         sdata->u.ibss.privacy = params->privacy;
1802         sdata->u.ibss.control_port = params->control_port;
1803         sdata->u.ibss.userspace_handles_dfs = params->userspace_handles_dfs;
1804         sdata->u.ibss.basic_rates = params->basic_rates;
1805         sdata->u.ibss.last_scan_completed = jiffies;
1806
1807         /* fix basic_rates if channel does not support these rates */
1808         rate_flags = ieee80211_chandef_rate_flags(&params->chandef);
1809         sband = local->hw.wiphy->bands[params->chandef.chan->band];
1810         for (i = 0; i < sband->n_bitrates; i++) {
1811                 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
1812                         sdata->u.ibss.basic_rates &= ~BIT(i);
1813         }
1814         memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate,
1815                sizeof(params->mcast_rate));
1816
1817         sdata->vif.bss_conf.beacon_int = params->beacon_interval;
1818
1819         sdata->u.ibss.chandef = params->chandef;
1820         sdata->u.ibss.fixed_channel = params->channel_fixed;
1821
1822         if (params->ie) {
1823                 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len,
1824                                            GFP_KERNEL);
1825                 if (sdata->u.ibss.ie)
1826                         sdata->u.ibss.ie_len = params->ie_len;
1827         }
1828
1829         sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
1830         sdata->u.ibss.ibss_join_req = jiffies;
1831
1832         memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len);
1833         sdata->u.ibss.ssid_len = params->ssid_len;
1834
1835         memcpy(&sdata->u.ibss.ht_capa, &params->ht_capa,
1836                sizeof(sdata->u.ibss.ht_capa));
1837         memcpy(&sdata->u.ibss.ht_capa_mask, &params->ht_capa_mask,
1838                sizeof(sdata->u.ibss.ht_capa_mask));
1839
1840         /*
1841          * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is
1842          * reserved, but an HT STA shall protect HT transmissions as though
1843          * the HT Protection field were set to non-HT mixed mode.
1844          *
1845          * In an IBSS, the RIFS Mode field of the HT Operation element is
1846          * also reserved, but an HT STA shall operate as though this field
1847          * were set to 1.
1848          */
1849
1850         sdata->vif.bss_conf.ht_operation_mode |=
1851                   IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED
1852                 | IEEE80211_HT_PARAM_RIFS_MODE;
1853
1854         changed |= BSS_CHANGED_HT | BSS_CHANGED_MCAST_RATE;
1855         ieee80211_link_info_change_notify(sdata, 0, changed);
1856
1857         sdata->deflink.smps_mode = IEEE80211_SMPS_OFF;
1858         sdata->deflink.needed_rx_chains = local->rx_chains;
1859         sdata->control_port_over_nl80211 = params->control_port_over_nl80211;
1860
1861         ieee80211_queue_work(&local->hw, &sdata->work);
1862
1863         return 0;
1864 }
1865
1866 int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata)
1867 {
1868         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1869
1870         ieee80211_ibss_disconnect(sdata);
1871         ifibss->ssid_len = 0;
1872         eth_zero_addr(ifibss->bssid);
1873
1874         /* remove beacon */
1875         kfree(sdata->u.ibss.ie);
1876         sdata->u.ibss.ie = NULL;
1877         sdata->u.ibss.ie_len = 0;
1878
1879         /* on the next join, re-program HT parameters */
1880         memset(&ifibss->ht_capa, 0, sizeof(ifibss->ht_capa));
1881         memset(&ifibss->ht_capa_mask, 0, sizeof(ifibss->ht_capa_mask));
1882
1883         synchronize_rcu();
1884
1885         skb_queue_purge(&sdata->skb_queue);
1886
1887         del_timer_sync(&sdata->u.ibss.timer);
1888
1889         return 0;
1890 }