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) 2018-2023 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
  55         /* Build IBSS probe response */
  56         frame_len = sizeof(struct ieee80211_hdr_3addr) +
  57                     12 /* struct ieee80211_mgmt.u.beacon */ +
  58                     2 + IEEE80211_MAX_SSID_LEN /* max SSID */ +
  59                     2 + 8 /* max Supported Rates */ +
  60                     3 /* max DS params */ +
  61                     4 /* IBSS params */ +
  62                     5 /* Channel Switch Announcement */ +
  63                     2 + (IEEE80211_MAX_SUPP_RATES - 8) +
  64                     2 + sizeof(struct ieee80211_ht_cap) +
  65                     2 + sizeof(struct ieee80211_ht_operation) +
  66                     2 + sizeof(struct ieee80211_vht_cap) +
  67                     2 + sizeof(struct ieee80211_vht_operation) +
  68                     ifibss->ie_len;
  69         presp = kzalloc(sizeof(*presp) + frame_len, GFP_KERNEL);
  70         if (!presp)
  71                 return NULL;
  72
  73         presp->head = (void *)(presp + 1);
  74
  75         mgmt = (void *) presp->head;
  76         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
  77                                           IEEE80211_STYPE_PROBE_RESP);
  78         eth_broadcast_addr(mgmt->da);
  79         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
  80         memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN);
  81         mgmt->u.beacon.beacon_int = cpu_to_le16(beacon_int);
  82         mgmt->u.beacon.timestamp = cpu_to_le64(tsf);
  83         mgmt->u.beacon.capab_info = cpu_to_le16(capability);
  84
  85         pos = (u8 *)mgmt + offsetof(struct ieee80211_mgmt, u.beacon.variable);
  86
  87         *pos++ = WLAN_EID_SSID;
  88         *pos++ = ifibss->ssid_len;
  89         memcpy(pos, ifibss->ssid, ifibss->ssid_len);
  90         pos += ifibss->ssid_len;
  91
  92         sband = local->hw.wiphy->bands[chandef->chan->band];
  93         rate_flags = ieee80211_chandef_rate_flags(chandef);
  94         rates_n = 0;
  95         if (have_higher_than_11mbit)
  96                 *have_higher_than_11mbit = false;
  97
  98         for (i = 0; i < sband->n_bitrates; i++) {
  99                 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
 100                         continue;
 101                 if (sband->bitrates[i].bitrate > 110 &&
 102                     have_higher_than_11mbit)
 103                         *have_higher_than_11mbit = true;
 104
 105                 rates |= BIT(i);
 106                 rates_n++;
 107         }
 108
 109         *pos++ = WLAN_EID_SUPP_RATES;
 110         *pos++ = min_t(int, 8, rates_n);
 111         for (ri = 0; ri < sband->n_bitrates; ri++) {
 112                 int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate, 5);
 113                 u8 basic = 0;
 114                 if (!(rates & BIT(ri)))
 115                         continue;
 116
 117                 if (basic_rates & BIT(ri))
 118                         basic = 0x80;
 119                 *pos++ = basic | (u8) rate;
 120                 if (++rates_added == 8) {
 121                         ri++; /* continue at next rate for EXT_SUPP_RATES */
 122                         break;
 123                 }
 124         }
 125
 126         if (sband->band == NL80211_BAND_2GHZ) {
 127                 *pos++ = WLAN_EID_DS_PARAMS;
 128                 *pos++ = 1;
 129                 *pos++ = ieee80211_frequency_to_channel(
 130                                 chandef->chan->center_freq);
 131         }
 132
 133         *pos++ = WLAN_EID_IBSS_PARAMS;
 134         *pos++ = 2;
 135         /* FIX: set ATIM window based on scan results */
 136         *pos++ = 0;
 137         *pos++ = 0;
 138
 139         if (csa_settings) {
 140                 *pos++ = WLAN_EID_CHANNEL_SWITCH;
 141                 *pos++ = 3;
 142                 *pos++ = csa_settings->block_tx ? 1 : 0;
 143                 *pos++ = ieee80211_frequency_to_channel(
 144                                 csa_settings->chandef.chan->center_freq);
 145                 presp->cntdwn_counter_offsets[0] = (pos - presp->head);
 146                 *pos++ = csa_settings->count;
 147                 presp->cntdwn_current_counter = csa_settings->count;
 148         }
 149
 150         /* put the remaining rates in WLAN_EID_EXT_SUPP_RATES */
 151         if (rates_n > 8) {
 152                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 153                 *pos++ = rates_n - 8;
 154                 for (; ri < sband->n_bitrates; ri++) {
 155                         int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate, 5);
 156                         u8 basic = 0;
 157                         if (!(rates & BIT(ri)))
 158                                 continue;
 159
 160                         if (basic_rates & BIT(ri))
 161                                 basic = 0x80;
 162                         *pos++ = basic | (u8) rate;
 163                 }
 164         }
 165
 166         if (ifibss->ie_len) {
 167                 memcpy(pos, ifibss->ie, ifibss->ie_len);
 168                 pos += ifibss->ie_len;
 169         }
 170
 171         /* add HT capability and information IEs */
 172         if (chandef->width != NL80211_CHAN_WIDTH_20_NOHT &&
 173             chandef->width != NL80211_CHAN_WIDTH_5 &&
 174             chandef->width != NL80211_CHAN_WIDTH_10 &&
 175             sband->ht_cap.ht_supported) {
 176                 struct ieee80211_sta_ht_cap ht_cap;
 177
 178                 memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
 179                 ieee80211_apply_htcap_overrides(sdata, &ht_cap);
 180
 181                 pos = ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap);
 182                 /*
 183                  * Note: According to 802.11n-2009 9.13.3.1, HT Protection
 184                  * field and RIFS Mode are reserved in IBSS mode, therefore
 185                  * keep them at 0
 186                  */
 187                 pos = ieee80211_ie_build_ht_oper(pos, &sband->ht_cap,
 188                                                  chandef, 0, false);
 189
 190                 /* add VHT capability and information IEs */
 191                 if (chandef->width != NL80211_CHAN_WIDTH_20 &&
 192                     chandef->width != NL80211_CHAN_WIDTH_40 &&
 193                     sband->vht_cap.vht_supported) {
 194                         pos = ieee80211_ie_build_vht_cap(pos, &sband->vht_cap,
 195                                                          sband->vht_cap.cap);
 196                         pos = ieee80211_ie_build_vht_oper(pos, &sband->vht_cap,
 197                                                           chandef);
 198                 }
 199         }
 200
 201         if (local->hw.queues >= IEEE80211_NUM_ACS)
 202                 pos = ieee80211_add_wmm_info_ie(pos, 0); /* U-APSD not in use */
 203
 204         presp->head_len = pos - presp->head;
 205         if (WARN_ON(presp->head_len > frame_len))
 206                 goto error;
 207
 208         return presp;
 209 error:
 210         kfree(presp);
 211         return NULL;
 212 }
 213
 214 static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
 215                                       const u8 *bssid, const int beacon_int,
 216                                       struct cfg80211_chan_def *req_chandef,
 217                                       const u32 basic_rates,
 218                                       const u16 capability, u64 tsf,
 219                                       bool creator)
 220 {
 221         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 222         struct ieee80211_local *local = sdata->local;
 223         struct ieee80211_mgmt *mgmt;
 224         struct cfg80211_bss *bss;
 225         u64 bss_change;
 226         struct ieee80211_chan_req chanreq = {};
 227         struct ieee80211_channel *chan;
 228         struct beacon_data *presp;
 229         struct cfg80211_inform_bss bss_meta = {};
 230         bool have_higher_than_11mbit;
 231         bool radar_required;
 232         int err;
 233
 234         lockdep_assert_wiphy(local->hw.wiphy);
 235
 236         /* Reset own TSF to allow time synchronization work. */
 237         drv_reset_tsf(local, sdata);
 238
 239         if (!ether_addr_equal(ifibss->bssid, bssid))
 240                 sta_info_flush(sdata, -1);
 241
 242         /* if merging, indicate to driver that we leave the old IBSS */
 243         if (sdata->vif.cfg.ibss_joined) {
 244                 sdata->vif.cfg.ibss_joined = false;
 245                 sdata->vif.cfg.ibss_creator = false;
 246                 sdata->vif.bss_conf.enable_beacon = false;
 247                 netif_carrier_off(sdata->dev);
 248                 ieee80211_bss_info_change_notify(sdata,
 249                                                  BSS_CHANGED_IBSS |
 250                                                  BSS_CHANGED_BEACON_ENABLED);
 251                 drv_leave_ibss(local, sdata);
 252         }
 253
 254         presp = sdata_dereference(ifibss->presp, sdata);
 255         RCU_INIT_POINTER(ifibss->presp, NULL);
 256         if (presp)
 257                 kfree_rcu(presp, rcu_head);
 258
 259         /* make a copy of the chandef, it could be modified below. */
 260         chanreq.oper = *req_chandef;
 261         chan = chanreq.oper.chan;
 262         if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chanreq.oper,
 263                                      NL80211_IFTYPE_ADHOC)) {
 264                 if (chanreq.oper.width == NL80211_CHAN_WIDTH_5 ||
 265                     chanreq.oper.width == NL80211_CHAN_WIDTH_10 ||
 266                     chanreq.oper.width == NL80211_CHAN_WIDTH_20_NOHT ||
 267                     chanreq.oper.width == NL80211_CHAN_WIDTH_20) {
 268                         sdata_info(sdata,
 269                                    "Failed to join IBSS, beacons forbidden\n");
 270                         return;
 271                 }
 272                 chanreq.oper.width = NL80211_CHAN_WIDTH_20;
 273                 chanreq.oper.center_freq1 = chan->center_freq;
 274                 /* check again for downgraded chandef */
 275                 if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chanreq.oper,
 276                                              NL80211_IFTYPE_ADHOC)) {
 277                         sdata_info(sdata,
 278                                    "Failed to join IBSS, beacons forbidden\n");
 279                         return;
 280                 }
 281         }
 282
 283         err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
 284                                             &chanreq.oper, NL80211_IFTYPE_ADHOC);
 285         if (err < 0) {
 286                 sdata_info(sdata,
 287                            "Failed to join IBSS, invalid chandef\n");
 288                 return;
 289         }
 290         if (err > 0 && !ifibss->userspace_handles_dfs) {
 291                 sdata_info(sdata,
 292                            "Failed to join IBSS, DFS channel without control program\n");
 293                 return;
 294         }
 295
 296         radar_required = err;
 297
 298         if (ieee80211_link_use_channel(&sdata->deflink, &chanreq,
 299                                        ifibss->fixed_channel ?
 300                                         IEEE80211_CHANCTX_SHARED :
 301                                         IEEE80211_CHANCTX_EXCLUSIVE)) {
 302                 sdata_info(sdata, "Failed to join IBSS, no channel context\n");
 303                 return;
 304         }
 305         sdata->deflink.radar_required = radar_required;
 306
 307         memcpy(ifibss->bssid, bssid, ETH_ALEN);
 308
 309         presp = ieee80211_ibss_build_presp(sdata, beacon_int, basic_rates,
 310                                            capability, tsf, &chanreq.oper,
 311                                            &have_higher_than_11mbit, NULL);
 312         if (!presp)
 313                 return;
 314
 315         rcu_assign_pointer(ifibss->presp, presp);
 316         mgmt = (void *)presp->head;
 317
 318         sdata->vif.bss_conf.enable_beacon = true;
 319         sdata->vif.bss_conf.beacon_int = beacon_int;
 320         sdata->vif.bss_conf.basic_rates = basic_rates;
 321         sdata->vif.cfg.ssid_len = ifibss->ssid_len;
 322         memcpy(sdata->vif.cfg.ssid, ifibss->ssid, ifibss->ssid_len);
 323         bss_change = BSS_CHANGED_BEACON_INT;
 324         bss_change |= ieee80211_reset_erp_info(sdata);
 325         bss_change |= BSS_CHANGED_BSSID;
 326         bss_change |= BSS_CHANGED_BEACON;
 327         bss_change |= BSS_CHANGED_BEACON_ENABLED;
 328         bss_change |= BSS_CHANGED_BASIC_RATES;
 329         bss_change |= BSS_CHANGED_HT;
 330         bss_change |= BSS_CHANGED_IBSS;
 331         bss_change |= BSS_CHANGED_SSID;
 332
 333         /*
 334          * In 5 GHz/802.11a, we can always use short slot time.
 335          * (IEEE 802.11-2012 18.3.8.7)
 336          *
 337          * In 2.4GHz, we must always use long slots in IBSS for compatibility
 338          * reasons.
 339          * (IEEE 802.11-2012 19.4.5)
 340          *
 341          * HT follows these specifications (IEEE 802.11-2012 20.3.18)
 342          */
 343         sdata->vif.bss_conf.use_short_slot = chan->band == NL80211_BAND_5GHZ;
 344         bss_change |= BSS_CHANGED_ERP_SLOT;
 345
 346         /* cf. IEEE 802.11 9.2.12 */
 347         sdata->deflink.operating_11g_mode =
 348                 chan->band == NL80211_BAND_2GHZ && have_higher_than_11mbit;
 349
 350         ieee80211_set_wmm_default(&sdata->deflink, true, false);
 351
 352         sdata->vif.cfg.ibss_joined = true;
 353         sdata->vif.cfg.ibss_creator = creator;
 354
 355         err = drv_join_ibss(local, sdata);
 356         if (err) {
 357                 sdata->vif.cfg.ibss_joined = false;
 358                 sdata->vif.cfg.ibss_creator = false;
 359                 sdata->vif.bss_conf.enable_beacon = false;
 360                 sdata->vif.cfg.ssid_len = 0;
 361                 RCU_INIT_POINTER(ifibss->presp, NULL);
 362                 kfree_rcu(presp, rcu_head);
 363                 ieee80211_link_release_channel(&sdata->deflink);
 364                 sdata_info(sdata, "Failed to join IBSS, driver failure: %d\n",
 365                            err);
 366                 return;
 367         }
 368
 369         ieee80211_bss_info_change_notify(sdata, bss_change);
 370
 371         ifibss->state = IEEE80211_IBSS_MLME_JOINED;
 372         mod_timer(&ifibss->timer,
 373                   round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
 374
 375         bss_meta.chan = chan;
 376         bss = cfg80211_inform_bss_frame_data(local->hw.wiphy, &bss_meta, mgmt,
 377                                              presp->head_len, GFP_KERNEL);
 378
 379         cfg80211_put_bss(local->hw.wiphy, bss);
 380         netif_carrier_on(sdata->dev);
 381         cfg80211_ibss_joined(sdata->dev, ifibss->bssid, chan, GFP_KERNEL);
 382 }
 383
 384 static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
 385                                     struct ieee80211_bss *bss)
 386 {
 387         struct cfg80211_bss *cbss =
 388                 container_of((void *)bss, struct cfg80211_bss, priv);
 389         struct ieee80211_supported_band *sband;
 390         struct cfg80211_chan_def chandef;
 391         u32 basic_rates;
 392         int i, j;
 393         u16 beacon_int = cbss->beacon_interval;
 394         const struct cfg80211_bss_ies *ies;
 395         enum nl80211_channel_type chan_type;
 396         u64 tsf;
 397         u32 rate_flags;
 398
 399         lockdep_assert_wiphy(sdata->local->hw.wiphy);
 400
 401         if (beacon_int < 10)
 402                 beacon_int = 10;
 403
 404         switch (sdata->u.ibss.chandef.width) {
 405         case NL80211_CHAN_WIDTH_20_NOHT:
 406         case NL80211_CHAN_WIDTH_20:
 407         case NL80211_CHAN_WIDTH_40:
 408                 chan_type = cfg80211_get_chandef_type(&sdata->u.ibss.chandef);
 409                 cfg80211_chandef_create(&chandef, cbss->channel, chan_type);
 410                 break;
 411         case NL80211_CHAN_WIDTH_5:
 412         case NL80211_CHAN_WIDTH_10:
 413                 cfg80211_chandef_create(&chandef, cbss->channel,
 414                                         NL80211_CHAN_NO_HT);
 415                 chandef.width = sdata->u.ibss.chandef.width;
 416                 break;
 417         case NL80211_CHAN_WIDTH_80:
 418         case NL80211_CHAN_WIDTH_80P80:
 419         case NL80211_CHAN_WIDTH_160:
 420                 chandef = sdata->u.ibss.chandef;
 421                 chandef.chan = cbss->channel;
 422                 break;
 423         default:
 424                 /* fall back to 20 MHz for unsupported modes */
 425                 cfg80211_chandef_create(&chandef, cbss->channel,
 426                                         NL80211_CHAN_NO_HT);
 427                 break;
 428         }
 429
 430         sband = sdata->local->hw.wiphy->bands[cbss->channel->band];
 431         rate_flags = ieee80211_chandef_rate_flags(&sdata->u.ibss.chandef);
 432
 433         basic_rates = 0;
 434
 435         for (i = 0; i < bss->supp_rates_len; i++) {
 436                 int rate = bss->supp_rates[i] & 0x7f;
 437                 bool is_basic = !!(bss->supp_rates[i] & 0x80);
 438
 439                 for (j = 0; j < sband->n_bitrates; j++) {
 440                         int brate;
 441                         if ((rate_flags & sband->bitrates[j].flags)
 442                             != rate_flags)
 443                                 continue;
 444
 445                         brate = DIV_ROUND_UP(sband->bitrates[j].bitrate, 5);
 446                         if (brate == rate) {
 447                                 if (is_basic)
 448                                         basic_rates |= BIT(j);
 449                                 break;
 450                         }
 451                 }
 452         }
 453
 454         rcu_read_lock();
 455         ies = rcu_dereference(cbss->ies);
 456         tsf = ies->tsf;
 457         rcu_read_unlock();
 458
 459         __ieee80211_sta_join_ibss(sdata, cbss->bssid,
 460                                   beacon_int,
 461                                   &chandef,
 462                                   basic_rates,
 463                                   cbss->capability,
 464                                   tsf, false);
 465 }
 466
 467 int ieee80211_ibss_csa_beacon(struct ieee80211_sub_if_data *sdata,
 468                               struct cfg80211_csa_settings *csa_settings,
 469                               u64 *changed)
 470 {
 471         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 472         struct beacon_data *presp, *old_presp;
 473         struct cfg80211_bss *cbss;
 474         const struct cfg80211_bss_ies *ies;
 475         u16 capability = WLAN_CAPABILITY_IBSS;
 476         u64 tsf;
 477
 478         lockdep_assert_wiphy(sdata->local->hw.wiphy);
 479
 480         if (ifibss->privacy)
 481                 capability |= WLAN_CAPABILITY_PRIVACY;
 482
 483         cbss = cfg80211_get_bss(sdata->local->hw.wiphy, ifibss->chandef.chan,
 484                                 ifibss->bssid, ifibss->ssid,
 485                                 ifibss->ssid_len, IEEE80211_BSS_TYPE_IBSS,
 486                                 IEEE80211_PRIVACY(ifibss->privacy));
 487
 488         if (unlikely(!cbss))
 489                 return -EINVAL;
 490
 491         rcu_read_lock();
 492         ies = rcu_dereference(cbss->ies);
 493         tsf = ies->tsf;
 494         rcu_read_unlock();
 495         cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
 496
 497         old_presp = sdata_dereference(ifibss->presp, sdata);
 498
 499         presp = ieee80211_ibss_build_presp(sdata,
 500                                            sdata->vif.bss_conf.beacon_int,
 501                                            sdata->vif.bss_conf.basic_rates,
 502                                            capability, tsf, &ifibss->chandef,
 503                                            NULL, csa_settings);
 504         if (!presp)
 505                 return -ENOMEM;
 506
 507         rcu_assign_pointer(ifibss->presp, presp);
 508         if (old_presp)
 509                 kfree_rcu(old_presp, rcu_head);
 510
 511         *changed |= BSS_CHANGED_BEACON;
 512         return 0;
 513 }
 514
 515 int ieee80211_ibss_finish_csa(struct ieee80211_sub_if_data *sdata, u64 *changed)
 516 {
 517         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 518         struct cfg80211_bss *cbss;
 519
 520         lockdep_assert_wiphy(sdata->local->hw.wiphy);
 521
 522         /* When not connected/joined, sending CSA doesn't make sense. */
 523         if (ifibss->state != IEEE80211_IBSS_MLME_JOINED)
 524                 return -ENOLINK;
 525
 526         /* update cfg80211 bss information with the new channel */
 527         if (!is_zero_ether_addr(ifibss->bssid)) {
 528                 cbss = cfg80211_get_bss(sdata->local->hw.wiphy,
 529                                         ifibss->chandef.chan,
 530                                         ifibss->bssid, ifibss->ssid,
 531                                         ifibss->ssid_len,
 532                                         IEEE80211_BSS_TYPE_IBSS,
 533                                         IEEE80211_PRIVACY(ifibss->privacy));
 534                 /* XXX: should not really modify cfg80211 data */
 535                 if (cbss) {
 536                         cbss->channel = sdata->deflink.csa_chanreq.oper.chan;
 537                         cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
 538                 }
 539         }
 540
 541         ifibss->chandef = sdata->deflink.csa_chanreq.oper;
 542
 543         /* generate the beacon */
 544         return ieee80211_ibss_csa_beacon(sdata, NULL, changed);
 545 }
 546
 547 void ieee80211_ibss_stop(struct ieee80211_sub_if_data *sdata)
 548 {
 549         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 550
 551         wiphy_work_cancel(sdata->local->hw.wiphy,
 552                           &ifibss->csa_connection_drop_work);
 553 }
 554
 555 static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta)
 556         __acquires(RCU)
 557 {
 558         struct ieee80211_sub_if_data *sdata = sta->sdata;
 559         u8 addr[ETH_ALEN];
 560
 561         memcpy(addr, sta->sta.addr, ETH_ALEN);
 562
 563         ibss_dbg(sdata, "Adding new IBSS station %pM\n", addr);
 564
 565         sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
 566         sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
 567         /* authorize the station only if the network is not RSN protected. If
 568          * not wait for the userspace to authorize it */
 569         if (!sta->sdata->u.ibss.control_port)
 570                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
 571
 572         rate_control_rate_init(sta);
 573
 574         /* If it fails, maybe we raced another insertion? */
 575         if (sta_info_insert_rcu(sta))
 576                 return sta_info_get(sdata, addr);
 577         return sta;
 578 }
 579
 580 static struct sta_info *
 581 ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, const u8 *bssid,
 582                        const u8 *addr, u32 supp_rates)
 583         __acquires(RCU)
 584 {
 585         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 586         struct ieee80211_local *local = sdata->local;
 587         struct sta_info *sta;
 588         struct ieee80211_chanctx_conf *chanctx_conf;
 589         struct ieee80211_supported_band *sband;
 590         int band;
 591
 592         /*
 593          * XXX: Consider removing the least recently used entry and
 594          *      allow new one to be added.
 595          */
 596         if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
 597                 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
 598                                     sdata->name, addr);
 599                 rcu_read_lock();
 600                 return NULL;
 601         }
 602
 603         if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) {
 604                 rcu_read_lock();
 605                 return NULL;
 606         }
 607
 608         if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) {
 609                 rcu_read_lock();
 610                 return NULL;
 611         }
 612
 613         rcu_read_lock();
 614         chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
 615         if (WARN_ON_ONCE(!chanctx_conf))
 616                 return NULL;
 617         band = chanctx_conf->def.chan->band;
 618         rcu_read_unlock();
 619
 620         sta = sta_info_alloc(sdata, addr, GFP_KERNEL);
 621         if (!sta) {
 622                 rcu_read_lock();
 623                 return NULL;
 624         }
 625
 626         /* make sure mandatory rates are always added */
 627         sband = local->hw.wiphy->bands[band];
 628         sta->sta.deflink.supp_rates[band] = supp_rates |
 629                         ieee80211_mandatory_rates(sband);
 630
 631         return ieee80211_ibss_finish_sta(sta);
 632 }
 633
 634 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
 635 {
 636         struct ieee80211_local *local = sdata->local;
 637         int active = 0;
 638         struct sta_info *sta;
 639
 640         lockdep_assert_wiphy(sdata->local->hw.wiphy);
 641
 642         rcu_read_lock();
 643
 644         list_for_each_entry_rcu(sta, &local->sta_list, list) {
 645                 unsigned long last_active = ieee80211_sta_last_active(sta);
 646
 647                 if (sta->sdata == sdata &&
 648                     time_is_after_jiffies(last_active +
 649                                           IEEE80211_IBSS_MERGE_INTERVAL)) {
 650                         active++;
 651                         break;
 652                 }
 653         }
 654
 655         rcu_read_unlock();
 656
 657         return active;
 658 }
 659
 660 static void ieee80211_ibss_disconnect(struct ieee80211_sub_if_data *sdata)
 661 {
 662         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 663         struct ieee80211_local *local = sdata->local;
 664         struct cfg80211_bss *cbss;
 665         struct beacon_data *presp;
 666         struct sta_info *sta;
 667
 668         lockdep_assert_wiphy(local->hw.wiphy);
 669
 670         if (!is_zero_ether_addr(ifibss->bssid)) {
 671                 cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->chandef.chan,
 672                                         ifibss->bssid, ifibss->ssid,
 673                                         ifibss->ssid_len,
 674                                         IEEE80211_BSS_TYPE_IBSS,
 675                                         IEEE80211_PRIVACY(ifibss->privacy));
 676
 677                 if (cbss) {
 678                         cfg80211_unlink_bss(local->hw.wiphy, cbss);
 679                         cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
 680                 }
 681         }
 682
 683         ifibss->state = IEEE80211_IBSS_MLME_SEARCH;
 684
 685         sta_info_flush(sdata, -1);
 686
 687         spin_lock_bh(&ifibss->incomplete_lock);
 688         while (!list_empty(&ifibss->incomplete_stations)) {
 689                 sta = list_first_entry(&ifibss->incomplete_stations,
 690                                        struct sta_info, list);
 691                 list_del(&sta->list);
 692                 spin_unlock_bh(&ifibss->incomplete_lock);
 693
 694                 sta_info_free(local, sta);
 695                 spin_lock_bh(&ifibss->incomplete_lock);
 696         }
 697         spin_unlock_bh(&ifibss->incomplete_lock);
 698
 699         netif_carrier_off(sdata->dev);
 700
 701         sdata->vif.cfg.ibss_joined = false;
 702         sdata->vif.cfg.ibss_creator = false;
 703         sdata->vif.bss_conf.enable_beacon = false;
 704         sdata->vif.cfg.ssid_len = 0;
 705
 706         /* remove beacon */
 707         presp = sdata_dereference(ifibss->presp, sdata);
 708         RCU_INIT_POINTER(sdata->u.ibss.presp, NULL);
 709         if (presp)
 710                 kfree_rcu(presp, rcu_head);
 711
 712         clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state);
 713         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED |
 714                                                 BSS_CHANGED_IBSS);
 715         drv_leave_ibss(local, sdata);
 716         ieee80211_link_release_channel(&sdata->deflink);
 717 }
 718
 719 static void ieee80211_csa_connection_drop_work(struct wiphy *wiphy,
 720                                                struct wiphy_work *work)
 721 {
 722         struct ieee80211_sub_if_data *sdata =
 723                 container_of(work, struct ieee80211_sub_if_data,
 724                              u.ibss.csa_connection_drop_work);
 725
 726         ieee80211_ibss_disconnect(sdata);
 727         synchronize_rcu();
 728         skb_queue_purge(&sdata->skb_queue);
 729
 730         /* trigger a scan to find another IBSS network to join */
 731         wiphy_work_queue(sdata->local->hw.wiphy, &sdata->work);
 732 }
 733
 734 static void ieee80211_ibss_csa_mark_radar(struct ieee80211_sub_if_data *sdata)
 735 {
 736         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 737         int err;
 738
 739         /* if the current channel is a DFS channel, mark the channel as
 740          * unavailable.
 741          */
 742         err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
 743                                             &ifibss->chandef,
 744                                             NL80211_IFTYPE_ADHOC);
 745         if (err > 0)
 746                 cfg80211_radar_event(sdata->local->hw.wiphy, &ifibss->chandef,
 747                                      GFP_ATOMIC);
 748 }
 749
 750 static bool
 751 ieee80211_ibss_process_chanswitch(struct ieee80211_sub_if_data *sdata,
 752                                   struct ieee802_11_elems *elems,
 753                                   bool beacon)
 754 {
 755         struct cfg80211_csa_settings params;
 756         struct ieee80211_csa_ie csa_ie;
 757         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 758         enum nl80211_channel_type ch_type;
 759         int err;
 760         struct ieee80211_conn_settings conn = {
 761                 .mode = IEEE80211_CONN_MODE_HT,
 762                 .bw_limit = IEEE80211_CONN_BW_LIMIT_40,
 763         };
 764         u32 vht_cap_info = 0;
 765
 766         lockdep_assert_wiphy(sdata->local->hw.wiphy);
 767
 768         switch (ifibss->chandef.width) {
 769         case NL80211_CHAN_WIDTH_5:
 770         case NL80211_CHAN_WIDTH_10:
 771         case NL80211_CHAN_WIDTH_20_NOHT:
 772                 conn.mode = IEEE80211_CONN_MODE_LEGACY;
 773                 fallthrough;
 774         case NL80211_CHAN_WIDTH_20:
 775                 conn.bw_limit = IEEE80211_CONN_BW_LIMIT_20;
 776                 break;
 777         default:
 778                 break;
 779         }
 780
 781         if (elems->vht_cap_elem)
 782                 vht_cap_info = le32_to_cpu(elems->vht_cap_elem->vht_cap_info);
 783
 784         memset(&params, 0, sizeof(params));
 785         err = ieee80211_parse_ch_switch_ie(sdata, elems,
 786                                            ifibss->chandef.chan->band,
 787                                            vht_cap_info, &conn,
 788                                            ifibss->bssid, &csa_ie);
 789         /* can't switch to destination channel, fail */
 790         if (err < 0)
 791                 goto disconnect;
 792
 793         /* did not contain a CSA */
 794         if (err)
 795                 return false;
 796
 797         /* channel switch is not supported, disconnect */
 798         if (!(sdata->local->hw.wiphy->flags & WIPHY_FLAG_HAS_CHANNEL_SWITCH))
 799                 goto disconnect;
 800
 801         params.count = csa_ie.count;
 802         params.chandef = csa_ie.chanreq.oper;
 803
 804         switch (ifibss->chandef.width) {
 805         case NL80211_CHAN_WIDTH_20_NOHT:
 806         case NL80211_CHAN_WIDTH_20:
 807         case NL80211_CHAN_WIDTH_40:
 808                 /* keep our current HT mode (HT20/HT40+/HT40-), even if
 809                  * another mode  has been announced. The mode is not adopted
 810                  * within the beacon while doing CSA and we should therefore
 811                  * keep the mode which we announce.
 812                  */
 813                 ch_type = cfg80211_get_chandef_type(&ifibss->chandef);
 814                 cfg80211_chandef_create(&params.chandef, params.chandef.chan,
 815                                         ch_type);
 816                 break;
 817         case NL80211_CHAN_WIDTH_5:
 818         case NL80211_CHAN_WIDTH_10:
 819                 if (params.chandef.width != ifibss->chandef.width) {
 820                         sdata_info(sdata,
 821                                    "IBSS %pM received channel switch from incompatible channel width (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
 822                                    ifibss->bssid,
 823                                    params.chandef.chan->center_freq,
 824                                    params.chandef.width,
 825                                    params.chandef.center_freq1,
 826                                    params.chandef.center_freq2);
 827                         goto disconnect;
 828                 }
 829                 break;
 830         default:
 831                 /* should not happen, conn_flags should prevent VHT modes. */
 832                 WARN_ON(1);
 833                 goto disconnect;
 834         }
 835
 836         if (!cfg80211_reg_can_beacon(sdata->local->hw.wiphy, &params.chandef,
 837                                      NL80211_IFTYPE_ADHOC)) {
 838                 sdata_info(sdata,
 839                            "IBSS %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
 840                            ifibss->bssid,
 841                            params.chandef.chan->center_freq,
 842                            params.chandef.width,
 843                            params.chandef.center_freq1,
 844                            params.chandef.center_freq2);
 845                 goto disconnect;
 846         }
 847
 848         err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
 849                                             &params.chandef,
 850                                             NL80211_IFTYPE_ADHOC);
 851         if (err < 0)
 852                 goto disconnect;
 853         if (err > 0 && !ifibss->userspace_handles_dfs) {
 854                 /* IBSS-DFS only allowed with a control program */
 855                 goto disconnect;
 856         }
 857
 858         params.radar_required = err;
 859
 860         if (cfg80211_chandef_identical(&params.chandef,
 861                                        &sdata->vif.bss_conf.chanreq.oper)) {
 862                 ibss_dbg(sdata,
 863                          "received csa with an identical chandef, ignoring\n");
 864                 return true;
 865         }
 866
 867         /* all checks done, now perform the channel switch. */
 868         ibss_dbg(sdata,
 869                  "received channel switch announcement to go to channel %d MHz\n",
 870                  params.chandef.chan->center_freq);
 871
 872         params.block_tx = !!csa_ie.mode;
 873
 874         if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev,
 875                                      &params))
 876                 goto disconnect;
 877
 878         ieee80211_ibss_csa_mark_radar(sdata);
 879
 880         return true;
 881 disconnect:
 882         ibss_dbg(sdata, "Can't handle channel switch, disconnect\n");
 883         wiphy_work_queue(sdata->local->hw.wiphy,
 884                          &ifibss->csa_connection_drop_work);
 885
 886         ieee80211_ibss_csa_mark_radar(sdata);
 887
 888         return true;
 889 }
 890
 891 static void
 892 ieee80211_rx_mgmt_spectrum_mgmt(struct ieee80211_sub_if_data *sdata,
 893                                 struct ieee80211_mgmt *mgmt, size_t len,
 894                                 struct ieee80211_rx_status *rx_status,
 895                                 struct ieee802_11_elems *elems)
 896 {
 897         int required_len;
 898
 899         if (len < IEEE80211_MIN_ACTION_SIZE + 1)
 900                 return;
 901
 902         /* CSA is the only action we handle for now */
 903         if (mgmt->u.action.u.measurement.action_code !=
 904             WLAN_ACTION_SPCT_CHL_SWITCH)
 905                 return;
 906
 907         required_len = IEEE80211_MIN_ACTION_SIZE +
 908                        sizeof(mgmt->u.action.u.chan_switch);
 909         if (len < required_len)
 910                 return;
 911
 912         if (!sdata->vif.bss_conf.csa_active)
 913                 ieee80211_ibss_process_chanswitch(sdata, elems, false);
 914 }
 915
 916 static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data *sdata,
 917                                           struct ieee80211_mgmt *mgmt,
 918                                           size_t len)
 919 {
 920         u16 reason = le16_to_cpu(mgmt->u.deauth.reason_code);
 921
 922         if (len < IEEE80211_DEAUTH_FRAME_LEN)
 923                 return;
 924
 925         ibss_dbg(sdata, "RX DeAuth SA=%pM DA=%pM\n", mgmt->sa, mgmt->da);
 926         ibss_dbg(sdata, "\tBSSID=%pM (reason: %d)\n", mgmt->bssid, reason);
 927         sta_info_destroy_addr(sdata, mgmt->sa);
 928 }
 929
 930 static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata,
 931                                         struct ieee80211_mgmt *mgmt,
 932                                         size_t len)
 933 {
 934         u16 auth_alg, auth_transaction;
 935
 936         lockdep_assert_wiphy(sdata->local->hw.wiphy);
 937
 938         if (len < 24 + 6)
 939                 return;
 940
 941         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
 942         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
 943
 944         ibss_dbg(sdata, "RX Auth SA=%pM DA=%pM\n", mgmt->sa, mgmt->da);
 945         ibss_dbg(sdata, "\tBSSID=%pM (auth_transaction=%d)\n",
 946                  mgmt->bssid, auth_transaction);
 947
 948         if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
 949                 return;
 950
 951         /*
 952          * IEEE 802.11 standard does not require authentication in IBSS
 953          * networks and most implementations do not seem to use it.
 954          * However, try to reply to authentication attempts if someone
 955          * has actually implemented this.
 956          */
 957         ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, 0, NULL, 0,
 958                             mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0, 0);
 959 }
 960
 961 static void ieee80211_update_sta_info(struct ieee80211_sub_if_data *sdata,
 962                                       struct ieee80211_mgmt *mgmt, size_t len,
 963                                       struct ieee80211_rx_status *rx_status,
 964                                       struct ieee802_11_elems *elems,
 965                                       struct ieee80211_channel *channel)
 966 {
 967         struct sta_info *sta;
 968         enum nl80211_band band = rx_status->band;
 969         struct ieee80211_local *local = sdata->local;
 970         struct ieee80211_supported_band *sband;
 971         bool rates_updated = false;
 972         u32 supp_rates = 0;
 973
 974         if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
 975                 return;
 976
 977         if (!ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid))
 978                 return;
 979
 980         sband = local->hw.wiphy->bands[band];
 981         if (WARN_ON(!sband))
 982                 return;
 983
 984         rcu_read_lock();
 985         sta = sta_info_get(sdata, mgmt->sa);
 986
 987         if (elems->supp_rates) {
 988                 supp_rates = ieee80211_sta_get_rates(sdata, elems,
 989                                                      band, NULL);
 990                 if (sta) {
 991                         u32 prev_rates;
 992
 993                         prev_rates = sta->sta.deflink.supp_rates[band];
 994
 995                         sta->sta.deflink.supp_rates[band] = supp_rates |
 996                                 ieee80211_mandatory_rates(sband);
 997                         if (sta->sta.deflink.supp_rates[band] != prev_rates) {
 998                                 ibss_dbg(sdata,
 999                                          "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n",
1000                                          sta->sta.addr, prev_rates,
1001                                          sta->sta.deflink.supp_rates[band]);
1002                                 rates_updated = true;
1003                         }
1004                 } else {
1005                         rcu_read_unlock();
1006                         sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid,
1007                                                      mgmt->sa, supp_rates);
1008                 }
1009         }
1010
1011         if (sta && !sta->sta.wme &&
1012             (elems->wmm_info || elems->s1g_capab) &&
1013             local->hw.queues >= IEEE80211_NUM_ACS) {
1014                 sta->sta.wme = true;
1015                 ieee80211_check_fast_xmit(sta);
1016         }
1017
1018         if (sta && elems->ht_operation && elems->ht_cap_elem &&
1019             sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20_NOHT &&
1020             sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_5 &&
1021             sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_10) {
1022                 /* we both use HT */
1023                 struct ieee80211_ht_cap htcap_ie;
1024                 struct cfg80211_chan_def chandef;
1025                 enum ieee80211_sta_rx_bandwidth bw = sta->sta.deflink.bandwidth;
1026
1027                 cfg80211_chandef_create(&chandef, channel, NL80211_CHAN_NO_HT);
1028                 ieee80211_chandef_ht_oper(elems->ht_operation, &chandef);
1029
1030                 memcpy(&htcap_ie, elems->ht_cap_elem, sizeof(htcap_ie));
1031                 rates_updated |= ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
1032                                                                    &htcap_ie,
1033                                                                    &sta->deflink);
1034
1035                 if (elems->vht_operation && elems->vht_cap_elem &&
1036                     sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20 &&
1037                     sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_40) {
1038                         /* we both use VHT */
1039                         struct ieee80211_vht_cap cap_ie;
1040                         struct ieee80211_sta_vht_cap cap = sta->sta.deflink.vht_cap;
1041                         u32 vht_cap_info =
1042                                 le32_to_cpu(elems->vht_cap_elem->vht_cap_info);
1043
1044                         ieee80211_chandef_vht_oper(&local->hw, vht_cap_info,
1045                                                    elems->vht_operation,
1046                                                    elems->ht_operation,
1047                                                    &chandef);
1048                         memcpy(&cap_ie, elems->vht_cap_elem, sizeof(cap_ie));
1049                         ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
1050                                                             &cap_ie, NULL,
1051                                                             &sta->deflink);
1052                         if (memcmp(&cap, &sta->sta.deflink.vht_cap, sizeof(cap)))
1053                                 rates_updated |= true;
1054                 }
1055
1056                 if (bw != sta->sta.deflink.bandwidth)
1057                         rates_updated |= true;
1058
1059                 if (!cfg80211_chandef_compatible(&sdata->u.ibss.chandef,
1060                                                  &chandef))
1061                         WARN_ON_ONCE(1);
1062         }
1063
1064         if (sta && rates_updated) {
1065                 u32 changed = IEEE80211_RC_SUPP_RATES_CHANGED;
1066                 u8 rx_nss = sta->sta.deflink.rx_nss;
1067
1068                 /* Force rx_nss recalculation */
1069                 sta->sta.deflink.rx_nss = 0;
1070                 rate_control_rate_init(sta);
1071                 if (sta->sta.deflink.rx_nss != rx_nss)
1072                         changed |= IEEE80211_RC_NSS_CHANGED;
1073
1074                 drv_sta_rc_update(local, sdata, &sta->sta, changed);
1075         }
1076
1077         rcu_read_unlock();
1078 }
1079
1080 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1081                                   struct ieee80211_mgmt *mgmt, size_t len,
1082                                   struct ieee80211_rx_status *rx_status,
1083                                   struct ieee802_11_elems *elems)
1084 {
1085         struct ieee80211_local *local = sdata->local;
1086         struct cfg80211_bss *cbss;
1087         struct ieee80211_bss *bss;
1088         struct ieee80211_channel *channel;
1089         u64 beacon_timestamp, rx_timestamp;
1090         u32 supp_rates = 0;
1091         enum nl80211_band band = rx_status->band;
1092
1093         channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
1094         if (!channel)
1095                 return;
1096
1097         ieee80211_update_sta_info(sdata, mgmt, len, rx_status, elems, channel);
1098
1099         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, channel);
1100         if (!bss)
1101                 return;
1102
1103         cbss = container_of((void *)bss, struct cfg80211_bss, priv);
1104
1105         /* same for beacon and probe response */
1106         beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp);
1107
1108         /* check if we need to merge IBSS */
1109
1110         /* not an IBSS */
1111         if (!(cbss->capability & WLAN_CAPABILITY_IBSS))
1112                 goto put_bss;
1113
1114         /* different channel */
1115         if (sdata->u.ibss.fixed_channel &&
1116             sdata->u.ibss.chandef.chan != cbss->channel)
1117                 goto put_bss;
1118
1119         /* different SSID */
1120         if (elems->ssid_len != sdata->u.ibss.ssid_len ||
1121             memcmp(elems->ssid, sdata->u.ibss.ssid,
1122                                 sdata->u.ibss.ssid_len))
1123                 goto put_bss;
1124
1125         /* process channel switch */
1126         if (sdata->vif.bss_conf.csa_active ||
1127             ieee80211_ibss_process_chanswitch(sdata, elems, true))
1128                 goto put_bss;
1129
1130         /* same BSSID */
1131         if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid))
1132                 goto put_bss;
1133
1134         /* we use a fixed BSSID */
1135         if (sdata->u.ibss.fixed_bssid)
1136                 goto put_bss;
1137
1138         if (ieee80211_have_rx_timestamp(rx_status)) {
1139                 /* time when timestamp field was received */
1140                 rx_timestamp =
1141                         ieee80211_calculate_rx_timestamp(local, rx_status,
1142                                                          len + FCS_LEN, 24);
1143         } else {
1144                 /*
1145                  * second best option: get current TSF
1146                  * (will return -1 if not supported)
1147                  */
1148                 rx_timestamp = drv_get_tsf(local, sdata);
1149         }
1150
1151         ibss_dbg(sdata, "RX beacon SA=%pM BSSID=%pM TSF=0x%llx\n",
1152                  mgmt->sa, mgmt->bssid,
1153                  (unsigned long long)rx_timestamp);
1154         ibss_dbg(sdata, "\tBCN=0x%llx diff=%lld @%lu\n",
1155                  (unsigned long long)beacon_timestamp,
1156                  (unsigned long long)(rx_timestamp - beacon_timestamp),
1157                  jiffies);
1158
1159         if (beacon_timestamp > rx_timestamp) {
1160                 ibss_dbg(sdata,
1161                          "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n",
1162                          mgmt->bssid);
1163                 ieee80211_sta_join_ibss(sdata, bss);
1164                 supp_rates = ieee80211_sta_get_rates(sdata, elems, band, NULL);
1165                 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa,
1166                                        supp_rates);
1167                 rcu_read_unlock();
1168         }
1169
1170  put_bss:
1171         ieee80211_rx_bss_put(local, bss);
1172 }
1173
1174 void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata,
1175                               const u8 *bssid, const u8 *addr,
1176                               u32 supp_rates)
1177 {
1178         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1179         struct ieee80211_local *local = sdata->local;
1180         struct sta_info *sta;
1181         struct ieee80211_chanctx_conf *chanctx_conf;
1182         struct ieee80211_supported_band *sband;
1183         int band;
1184
1185         /*
1186          * XXX: Consider removing the least recently used entry and
1187          *      allow new one to be added.
1188          */
1189         if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
1190                 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
1191                                     sdata->name, addr);
1192                 return;
1193         }
1194
1195         if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH)
1196                 return;
1197
1198         if (!ether_addr_equal(bssid, sdata->u.ibss.bssid))
1199                 return;
1200
1201         rcu_read_lock();
1202         chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
1203         if (WARN_ON_ONCE(!chanctx_conf)) {
1204                 rcu_read_unlock();
1205                 return;
1206         }
1207         band = chanctx_conf->def.chan->band;
1208         rcu_read_unlock();
1209
1210         sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
1211         if (!sta)
1212                 return;
1213
1214         /* make sure mandatory rates are always added */
1215         sband = local->hw.wiphy->bands[band];
1216         sta->sta.deflink.supp_rates[band] = supp_rates |
1217                         ieee80211_mandatory_rates(sband);
1218
1219         spin_lock(&ifibss->incomplete_lock);
1220         list_add(&sta->list, &ifibss->incomplete_stations);
1221         spin_unlock(&ifibss->incomplete_lock);
1222         wiphy_work_queue(local->hw.wiphy, &sdata->work);
1223 }
1224
1225 static void ieee80211_ibss_sta_expire(struct ieee80211_sub_if_data *sdata)
1226 {
1227         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1228         struct ieee80211_local *local = sdata->local;
1229         struct sta_info *sta, *tmp;
1230         unsigned long exp_time = IEEE80211_IBSS_INACTIVITY_LIMIT;
1231         unsigned long exp_rsn = IEEE80211_IBSS_RSN_INACTIVITY_LIMIT;
1232
1233         lockdep_assert_wiphy(local->hw.wiphy);
1234
1235         list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
1236                 unsigned long last_active = ieee80211_sta_last_active(sta);
1237
1238                 if (sdata != sta->sdata)
1239                         continue;
1240
1241                 if (time_is_before_jiffies(last_active + exp_time) ||
1242                     (time_is_before_jiffies(last_active + exp_rsn) &&
1243                      sta->sta_state != IEEE80211_STA_AUTHORIZED)) {
1244                         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
1245
1246                         sta_dbg(sta->sdata, "expiring inactive %sSTA %pM\n",
1247                                 sta->sta_state != IEEE80211_STA_AUTHORIZED ?
1248                                 "not authorized " : "", sta->sta.addr);
1249
1250                         ieee80211_send_deauth_disassoc(sdata, sta->sta.addr,
1251                                                        ifibss->bssid,
1252                                                        IEEE80211_STYPE_DEAUTH,
1253                                                        WLAN_REASON_DEAUTH_LEAVING,
1254                                                        true, frame_buf);
1255                         WARN_ON(__sta_info_destroy(sta));
1256                 }
1257         }
1258 }
1259
1260 /*
1261  * This function is called with state == IEEE80211_IBSS_MLME_JOINED
1262  */
1263
1264 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
1265 {
1266         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1267
1268         lockdep_assert_wiphy(sdata->local->hw.wiphy);
1269
1270         mod_timer(&ifibss->timer,
1271                   round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
1272
1273         ieee80211_ibss_sta_expire(sdata);
1274
1275         if (time_before(jiffies, ifibss->last_scan_completed +
1276                        IEEE80211_IBSS_MERGE_INTERVAL))
1277                 return;
1278
1279         if (ieee80211_sta_active_ibss(sdata))
1280                 return;
1281
1282         if (ifibss->fixed_channel)
1283                 return;
1284
1285         sdata_info(sdata,
1286                    "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n");
1287
1288         ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len,
1289                                     NULL, 0);
1290 }
1291
1292 static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
1293 {
1294         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1295         u8 bssid[ETH_ALEN];
1296         u16 capability;
1297         int i;
1298
1299         lockdep_assert_wiphy(sdata->local->hw.wiphy);
1300
1301         if (ifibss->fixed_bssid) {
1302                 memcpy(bssid, ifibss->bssid, ETH_ALEN);
1303         } else {
1304                 /* Generate random, not broadcast, locally administered BSSID. Mix in
1305                  * own MAC address to make sure that devices that do not have proper
1306                  * random number generator get different BSSID. */
1307                 get_random_bytes(bssid, ETH_ALEN);
1308                 for (i = 0; i < ETH_ALEN; i++)
1309                         bssid[i] ^= sdata->vif.addr[i];
1310                 bssid[0] &= ~0x01;
1311                 bssid[0] |= 0x02;
1312         }
1313
1314         sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid);
1315
1316         capability = WLAN_CAPABILITY_IBSS;
1317
1318         if (ifibss->privacy)
1319                 capability |= WLAN_CAPABILITY_PRIVACY;
1320
1321         __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int,
1322                                   &ifibss->chandef, ifibss->basic_rates,
1323                                   capability, 0, true);
1324 }
1325
1326 static unsigned int ibss_setup_channels(struct wiphy *wiphy,
1327                                         struct ieee80211_channel **channels,
1328                                         unsigned int channels_max,
1329                                         u32 center_freq, u32 width)
1330 {
1331         struct ieee80211_channel *chan = NULL;
1332         unsigned int n_chan = 0;
1333         u32 start_freq, end_freq, freq;
1334
1335         if (width <= 20) {
1336                 start_freq = center_freq;
1337                 end_freq = center_freq;
1338         } else {
1339                 start_freq = center_freq - width / 2 + 10;
1340                 end_freq = center_freq + width / 2 - 10;
1341         }
1342
1343         for (freq = start_freq; freq <= end_freq; freq += 20) {
1344                 chan = ieee80211_get_channel(wiphy, freq);
1345                 if (!chan)
1346                         continue;
1347                 if (n_chan >= channels_max)
1348                         return n_chan;
1349
1350                 channels[n_chan] = chan;
1351                 n_chan++;
1352         }
1353
1354         return n_chan;
1355 }
1356
1357 static unsigned int
1358 ieee80211_ibss_setup_scan_channels(struct wiphy *wiphy,
1359                                    const struct cfg80211_chan_def *chandef,
1360                                    struct ieee80211_channel **channels,
1361                                    unsigned int channels_max)
1362 {
1363         unsigned int n_chan = 0;
1364         u32 width, cf1, cf2 = 0;
1365
1366         switch (chandef->width) {
1367         case NL80211_CHAN_WIDTH_40:
1368                 width = 40;
1369                 break;
1370         case NL80211_CHAN_WIDTH_80P80:
1371                 cf2 = chandef->center_freq2;
1372                 fallthrough;
1373         case NL80211_CHAN_WIDTH_80:
1374                 width = 80;
1375                 break;
1376         case NL80211_CHAN_WIDTH_160:
1377                 width = 160;
1378                 break;
1379         default:
1380                 width = 20;
1381                 break;
1382         }
1383
1384         cf1 = chandef->center_freq1;
1385
1386         n_chan = ibss_setup_channels(wiphy, channels, channels_max, cf1, width);
1387
1388         if (cf2)
1389                 n_chan += ibss_setup_channels(wiphy, &channels[n_chan],
1390                                               channels_max - n_chan, cf2,
1391                                               width);
1392
1393         return n_chan;
1394 }
1395
1396 /*
1397  * This function is called with state == IEEE80211_IBSS_MLME_SEARCH
1398  */
1399
1400 static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
1401 {
1402         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1403         struct ieee80211_local *local = sdata->local;
1404         struct cfg80211_bss *cbss;
1405         struct ieee80211_channel *chan = NULL;
1406         const u8 *bssid = NULL;
1407         int active_ibss;
1408
1409         lockdep_assert_wiphy(sdata->local->hw.wiphy);
1410
1411         active_ibss = ieee80211_sta_active_ibss(sdata);
1412         ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss);
1413
1414         if (active_ibss)
1415                 return;
1416
1417         if (ifibss->fixed_bssid)
1418                 bssid = ifibss->bssid;
1419         if (ifibss->fixed_channel)
1420                 chan = ifibss->chandef.chan;
1421         if (!is_zero_ether_addr(ifibss->bssid))
1422                 bssid = ifibss->bssid;
1423         cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid,
1424                                 ifibss->ssid, ifibss->ssid_len,
1425                                 IEEE80211_BSS_TYPE_IBSS,
1426                                 IEEE80211_PRIVACY(ifibss->privacy));
1427
1428         if (cbss) {
1429                 struct ieee80211_bss *bss;
1430
1431                 bss = (void *)cbss->priv;
1432                 ibss_dbg(sdata,
1433                          "sta_find_ibss: selected %pM current %pM\n",
1434                          cbss->bssid, ifibss->bssid);
1435                 sdata_info(sdata,
1436                            "Selected IBSS BSSID %pM based on configured SSID\n",
1437                            cbss->bssid);
1438
1439                 ieee80211_sta_join_ibss(sdata, bss);
1440                 ieee80211_rx_bss_put(local, bss);
1441                 return;
1442         }
1443
1444         /* if a fixed bssid and a fixed freq have been provided create the IBSS
1445          * directly and do not waste time scanning
1446          */
1447         if (ifibss->fixed_bssid && ifibss->fixed_channel) {
1448                 sdata_info(sdata, "Created IBSS using preconfigured BSSID %pM\n",
1449                            bssid);
1450                 ieee80211_sta_create_ibss(sdata);
1451                 return;
1452         }
1453
1454
1455         ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n");
1456
1457         /* Selected IBSS not found in current scan results - try to scan */
1458         if (time_after(jiffies, ifibss->last_scan_completed +
1459                                         IEEE80211_SCAN_INTERVAL)) {
1460                 struct ieee80211_channel *channels[8];
1461                 unsigned int num;
1462
1463                 sdata_info(sdata, "Trigger new scan to find an IBSS to join\n");
1464
1465                 if (ifibss->fixed_channel) {
1466                         num = ieee80211_ibss_setup_scan_channels(local->hw.wiphy,
1467                                                                  &ifibss->chandef,
1468                                                                  channels,
1469                                                                  ARRAY_SIZE(channels));
1470                         ieee80211_request_ibss_scan(sdata, ifibss->ssid,
1471                                                     ifibss->ssid_len, channels,
1472                                                     num);
1473                 } else {
1474                         ieee80211_request_ibss_scan(sdata, ifibss->ssid,
1475                                                     ifibss->ssid_len, NULL, 0);
1476                 }
1477         } else {
1478                 int interval = IEEE80211_SCAN_INTERVAL;
1479
1480                 if (time_after(jiffies, ifibss->ibss_join_req +
1481                                IEEE80211_IBSS_JOIN_TIMEOUT))
1482                         ieee80211_sta_create_ibss(sdata);
1483
1484                 mod_timer(&ifibss->timer,
1485                           round_jiffies(jiffies + interval));
1486         }
1487 }
1488
1489 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
1490                                         struct sk_buff *req)
1491 {
1492         struct ieee80211_mgmt *mgmt = (void *)req->data;
1493         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1494         struct ieee80211_local *local = sdata->local;
1495         int tx_last_beacon, len = req->len;
1496         struct sk_buff *skb;
1497         struct beacon_data *presp;
1498         u8 *pos, *end;
1499
1500         lockdep_assert_wiphy(sdata->local->hw.wiphy);
1501
1502         presp = sdata_dereference(ifibss->presp, sdata);
1503
1504         if (ifibss->state != IEEE80211_IBSS_MLME_JOINED ||
1505             len < 24 + 2 || !presp)
1506                 return;
1507
1508         tx_last_beacon = drv_tx_last_beacon(local);
1509
1510         ibss_dbg(sdata, "RX ProbeReq SA=%pM DA=%pM\n", mgmt->sa, mgmt->da);
1511         ibss_dbg(sdata, "\tBSSID=%pM (tx_last_beacon=%d)\n",
1512                  mgmt->bssid, tx_last_beacon);
1513
1514         if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da))
1515                 return;
1516
1517         if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) &&
1518             !is_broadcast_ether_addr(mgmt->bssid))
1519                 return;
1520
1521         end = ((u8 *) mgmt) + len;
1522         pos = mgmt->u.probe_req.variable;
1523         if (pos[0] != WLAN_EID_SSID ||
1524             pos + 2 + pos[1] > end) {
1525                 ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n",
1526                          mgmt->sa);
1527                 return;
1528         }
1529         if (pos[1] != 0 &&
1530             (pos[1] != ifibss->ssid_len ||
1531              memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) {
1532                 /* Ignore ProbeReq for foreign SSID */
1533                 return;
1534         }
1535
1536         /* Reply with ProbeResp */
1537         skb = dev_alloc_skb(local->tx_headroom + presp->head_len);
1538         if (!skb)
1539                 return;
1540
1541         skb_reserve(skb, local->tx_headroom);
1542         skb_put_data(skb, presp->head, presp->head_len);
1543
1544         memcpy(((struct ieee80211_mgmt *) skb->data)->da, mgmt->sa, ETH_ALEN);
1545         ibss_dbg(sdata, "Sending ProbeResp to %pM\n", mgmt->sa);
1546         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1547
1548         /* avoid excessive retries for probe request to wildcard SSIDs */
1549         if (pos[1] == 0)
1550                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_NO_ACK;
1551
1552         ieee80211_tx_skb(sdata, skb);
1553 }
1554
1555 static
1556 void ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data *sdata,
1557                                     struct ieee80211_mgmt *mgmt, size_t len,
1558                                     struct ieee80211_rx_status *rx_status)
1559 {
1560         size_t baselen;
1561         struct ieee802_11_elems *elems;
1562
1563         BUILD_BUG_ON(offsetof(typeof(mgmt->u.probe_resp), variable) !=
1564                      offsetof(typeof(mgmt->u.beacon), variable));
1565
1566         /*
1567          * either beacon or probe_resp but the variable field is at the
1568          * same offset
1569          */
1570         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1571         if (baselen > len)
1572                 return;
1573
1574         elems = ieee802_11_parse_elems(mgmt->u.probe_resp.variable,
1575                                        len - baselen, false, NULL);
1576
1577         if (elems) {
1578                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, elems);
1579                 kfree(elems);
1580         }
1581 }
1582
1583 void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1584                                    struct sk_buff *skb)
1585 {
1586         struct ieee80211_rx_status *rx_status;
1587         struct ieee80211_mgmt *mgmt;
1588         u16 fc;
1589         struct ieee802_11_elems *elems;
1590         int ies_len;
1591
1592         rx_status = IEEE80211_SKB_RXCB(skb);
1593         mgmt = (struct ieee80211_mgmt *) skb->data;
1594         fc = le16_to_cpu(mgmt->frame_control);
1595
1596         if (!sdata->u.ibss.ssid_len)
1597                 return; /* not ready to merge yet */
1598
1599         switch (fc & IEEE80211_FCTL_STYPE) {
1600         case IEEE80211_STYPE_PROBE_REQ:
1601                 ieee80211_rx_mgmt_probe_req(sdata, skb);
1602                 break;
1603         case IEEE80211_STYPE_PROBE_RESP:
1604         case IEEE80211_STYPE_BEACON:
1605                 ieee80211_rx_mgmt_probe_beacon(sdata, mgmt, skb->len,
1606                                                rx_status);
1607                 break;
1608         case IEEE80211_STYPE_AUTH:
1609                 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len);
1610                 break;
1611         case IEEE80211_STYPE_DEAUTH:
1612                 ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len);
1613                 break;
1614         case IEEE80211_STYPE_ACTION:
1615                 switch (mgmt->u.action.category) {
1616                 case WLAN_CATEGORY_SPECTRUM_MGMT:
1617                         ies_len = skb->len -
1618                                   offsetof(struct ieee80211_mgmt,
1619                                            u.action.u.chan_switch.variable);
1620
1621                         if (ies_len < 0)
1622                                 break;
1623
1624                         elems = ieee802_11_parse_elems(
1625                                 mgmt->u.action.u.chan_switch.variable,
1626                                 ies_len, true, NULL);
1627
1628                         if (elems && !elems->parse_error)
1629                                 ieee80211_rx_mgmt_spectrum_mgmt(sdata, mgmt,
1630                                                                 skb->len,
1631                                                                 rx_status,
1632                                                                 elems);
1633                         kfree(elems);
1634                         break;
1635                 }
1636         }
1637 }
1638
1639 void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata)
1640 {
1641         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1642         struct sta_info *sta;
1643
1644         /*
1645          * Work could be scheduled after scan or similar
1646          * when we aren't even joined (or trying) with a
1647          * network.
1648          */
1649         if (!ifibss->ssid_len)
1650                 return;
1651
1652         spin_lock_bh(&ifibss->incomplete_lock);
1653         while (!list_empty(&ifibss->incomplete_stations)) {
1654                 sta = list_first_entry(&ifibss->incomplete_stations,
1655                                        struct sta_info, list);
1656                 list_del(&sta->list);
1657                 spin_unlock_bh(&ifibss->incomplete_lock);
1658
1659                 ieee80211_ibss_finish_sta(sta);
1660                 rcu_read_unlock();
1661                 spin_lock_bh(&ifibss->incomplete_lock);
1662         }
1663         spin_unlock_bh(&ifibss->incomplete_lock);
1664
1665         switch (ifibss->state) {
1666         case IEEE80211_IBSS_MLME_SEARCH:
1667                 ieee80211_sta_find_ibss(sdata);
1668                 break;
1669         case IEEE80211_IBSS_MLME_JOINED:
1670                 ieee80211_sta_merge_ibss(sdata);
1671                 break;
1672         default:
1673                 WARN_ON(1);
1674                 break;
1675         }
1676 }
1677
1678 static void ieee80211_ibss_timer(struct timer_list *t)
1679 {
1680         struct ieee80211_sub_if_data *sdata =
1681                 from_timer(sdata, t, u.ibss.timer);
1682
1683         wiphy_work_queue(sdata->local->hw.wiphy, &sdata->work);
1684 }
1685
1686 void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata)
1687 {
1688         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1689
1690         timer_setup(&ifibss->timer, ieee80211_ibss_timer, 0);
1691         INIT_LIST_HEAD(&ifibss->incomplete_stations);
1692         spin_lock_init(&ifibss->incomplete_lock);
1693         wiphy_work_init(&ifibss->csa_connection_drop_work,
1694                         ieee80211_csa_connection_drop_work);
1695 }
1696
1697 /* scan finished notification */
1698 void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local)
1699 {
1700         struct ieee80211_sub_if_data *sdata;
1701
1702         lockdep_assert_wiphy(local->hw.wiphy);
1703
1704         list_for_each_entry(sdata, &local->interfaces, list) {
1705                 if (!ieee80211_sdata_running(sdata))
1706                         continue;
1707                 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
1708                         continue;
1709                 sdata->u.ibss.last_scan_completed = jiffies;
1710         }
1711 }
1712
1713 int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
1714                         struct cfg80211_ibss_params *params)
1715 {
1716         u64 changed = 0;
1717         u32 rate_flags;
1718         struct ieee80211_supported_band *sband;
1719         enum ieee80211_chanctx_mode chanmode;
1720         struct ieee80211_local *local = sdata->local;
1721         int radar_detect_width = 0;
1722         int i;
1723         int ret;
1724
1725         lockdep_assert_wiphy(local->hw.wiphy);
1726
1727         if (params->chandef.chan->freq_offset) {
1728                 /* this may work, but is untested */
1729                 return -EOPNOTSUPP;
1730         }
1731
1732         ret = cfg80211_chandef_dfs_required(local->hw.wiphy,
1733                                             &params->chandef,
1734                                             sdata->wdev.iftype);
1735         if (ret < 0)
1736                 return ret;
1737
1738         if (ret > 0) {
1739                 if (!params->userspace_handles_dfs)
1740                         return -EINVAL;
1741                 radar_detect_width = BIT(params->chandef.width);
1742         }
1743
1744         chanmode = (params->channel_fixed && !ret) ?
1745                 IEEE80211_CHANCTX_SHARED : IEEE80211_CHANCTX_EXCLUSIVE;
1746
1747         ret = ieee80211_check_combinations(sdata, &params->chandef, chanmode,
1748                                            radar_detect_width);
1749         if (ret < 0)
1750                 return ret;
1751
1752         if (params->bssid) {
1753                 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN);
1754                 sdata->u.ibss.fixed_bssid = true;
1755         } else
1756                 sdata->u.ibss.fixed_bssid = false;
1757
1758         sdata->u.ibss.privacy = params->privacy;
1759         sdata->u.ibss.control_port = params->control_port;
1760         sdata->u.ibss.userspace_handles_dfs = params->userspace_handles_dfs;
1761         sdata->u.ibss.basic_rates = params->basic_rates;
1762         sdata->u.ibss.last_scan_completed = jiffies;
1763
1764         /* fix basic_rates if channel does not support these rates */
1765         rate_flags = ieee80211_chandef_rate_flags(&params->chandef);
1766         sband = local->hw.wiphy->bands[params->chandef.chan->band];
1767         for (i = 0; i < sband->n_bitrates; i++) {
1768                 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
1769                         sdata->u.ibss.basic_rates &= ~BIT(i);
1770         }
1771         memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate,
1772                sizeof(params->mcast_rate));
1773
1774         sdata->vif.bss_conf.beacon_int = params->beacon_interval;
1775
1776         sdata->u.ibss.chandef = params->chandef;
1777         sdata->u.ibss.fixed_channel = params->channel_fixed;
1778
1779         if (params->ie) {
1780                 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len,
1781                                            GFP_KERNEL);
1782                 if (sdata->u.ibss.ie)
1783                         sdata->u.ibss.ie_len = params->ie_len;
1784         }
1785
1786         sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
1787         sdata->u.ibss.ibss_join_req = jiffies;
1788
1789         memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len);
1790         sdata->u.ibss.ssid_len = params->ssid_len;
1791
1792         memcpy(&sdata->u.ibss.ht_capa, &params->ht_capa,
1793                sizeof(sdata->u.ibss.ht_capa));
1794         memcpy(&sdata->u.ibss.ht_capa_mask, &params->ht_capa_mask,
1795                sizeof(sdata->u.ibss.ht_capa_mask));
1796
1797         /*
1798          * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is
1799          * reserved, but an HT STA shall protect HT transmissions as though
1800          * the HT Protection field were set to non-HT mixed mode.
1801          *
1802          * In an IBSS, the RIFS Mode field of the HT Operation element is
1803          * also reserved, but an HT STA shall operate as though this field
1804          * were set to 1.
1805          */
1806
1807         sdata->vif.bss_conf.ht_operation_mode |=
1808                   IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED
1809                 | IEEE80211_HT_PARAM_RIFS_MODE;
1810
1811         changed |= BSS_CHANGED_HT | BSS_CHANGED_MCAST_RATE;
1812         ieee80211_link_info_change_notify(sdata, &sdata->deflink, changed);
1813
1814         sdata->deflink.smps_mode = IEEE80211_SMPS_OFF;
1815         sdata->deflink.needed_rx_chains = local->rx_chains;
1816         sdata->control_port_over_nl80211 = params->control_port_over_nl80211;
1817
1818         wiphy_work_queue(local->hw.wiphy, &sdata->work);
1819
1820         return 0;
1821 }
1822
1823 int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata)
1824 {
1825         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1826
1827         ieee80211_ibss_disconnect(sdata);
1828         ifibss->ssid_len = 0;
1829         eth_zero_addr(ifibss->bssid);
1830
1831         /* remove beacon */
1832         kfree(sdata->u.ibss.ie);
1833         sdata->u.ibss.ie = NULL;
1834         sdata->u.ibss.ie_len = 0;
1835
1836         /* on the next join, re-program HT parameters */
1837         memset(&ifibss->ht_capa, 0, sizeof(ifibss->ht_capa));
1838         memset(&ifibss->ht_capa_mask, 0, sizeof(ifibss->ht_capa_mask));
1839
1840         synchronize_rcu();
1841
1842         skb_queue_purge(&sdata->skb_queue);
1843
1844         del_timer_sync(&sdata->u.ibss.timer);
1845
1846         return 0;
1847 }