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 = sdata_dereference(ifibss->presp, sdata);
 259         RCU_INIT_POINTER(ifibss->presp, NULL);
 260         if (presp)
 261                 kfree_rcu(presp, rcu_head);
 262
 263         /* make a copy of the chandef, it could be modified below. */
 264         chandef = *req_chandef;
 265         chan = chandef.chan;
 266         if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef,
 267                                      NL80211_IFTYPE_ADHOC)) {
 268                 if (chandef.width == NL80211_CHAN_WIDTH_5 ||
 269                     chandef.width == NL80211_CHAN_WIDTH_10 ||
 270                     chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
 271                     chandef.width == NL80211_CHAN_WIDTH_20) {
 272                         sdata_info(sdata,
 273                                    "Failed to join IBSS, beacons forbidden\n");
 274                         return;
 275                 }
 276                 chandef.width = NL80211_CHAN_WIDTH_20;
 277                 chandef.center_freq1 = chan->center_freq;
 278                 /* check again for downgraded chandef */
 279                 if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef,
 280                                              NL80211_IFTYPE_ADHOC)) {
 281                         sdata_info(sdata,
 282                                    "Failed to join IBSS, beacons forbidden\n");
 283                         return;
 284                 }
 285         }
 286
 287         err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
 288                                             &chandef, NL80211_IFTYPE_ADHOC);
 289         if (err < 0) {
 290                 sdata_info(sdata,
 291                            "Failed to join IBSS, invalid chandef\n");
 292                 return;
 293         }
 294         if (err > 0 && !ifibss->userspace_handles_dfs) {
 295                 sdata_info(sdata,
 296                            "Failed to join IBSS, DFS channel without control program\n");
 297                 return;
 298         }
 299
 300         radar_required = err;
 301
 302         mutex_lock(&local->mtx);
 303         if (ieee80211_link_use_channel(&sdata->deflink, &chandef,
 304                                        ifibss->fixed_channel ?
 305                                         IEEE80211_CHANCTX_SHARED :
 306                                         IEEE80211_CHANCTX_EXCLUSIVE)) {
 307                 sdata_info(sdata, "Failed to join IBSS, no channel context\n");
 308                 mutex_unlock(&local->mtx);
 309                 return;
 310         }
 311         sdata->deflink.radar_required = radar_required;
 312         mutex_unlock(&local->mtx);
 313
 314         memcpy(ifibss->bssid, bssid, ETH_ALEN);
 315
 316         presp = ieee80211_ibss_build_presp(sdata, beacon_int, basic_rates,
 317                                            capability, tsf, &chandef,
 318                                            &have_higher_than_11mbit, NULL);
 319         if (!presp)
 320                 return;
 321
 322         rcu_assign_pointer(ifibss->presp, presp);
 323         mgmt = (void *)presp->head;
 324
 325         sdata->vif.bss_conf.enable_beacon = true;
 326         sdata->vif.bss_conf.beacon_int = beacon_int;
 327         sdata->vif.bss_conf.basic_rates = basic_rates;
 328         sdata->vif.cfg.ssid_len = ifibss->ssid_len;
 329         memcpy(sdata->vif.cfg.ssid, ifibss->ssid, ifibss->ssid_len);
 330         bss_change = BSS_CHANGED_BEACON_INT;
 331         bss_change |= ieee80211_reset_erp_info(sdata);
 332         bss_change |= BSS_CHANGED_BSSID;
 333         bss_change |= BSS_CHANGED_BEACON;
 334         bss_change |= BSS_CHANGED_BEACON_ENABLED;
 335         bss_change |= BSS_CHANGED_BASIC_RATES;
 336         bss_change |= BSS_CHANGED_HT;
 337         bss_change |= BSS_CHANGED_IBSS;
 338         bss_change |= BSS_CHANGED_SSID;
 339
 340         /*
 341          * In 5 GHz/802.11a, we can always use short slot time.
 342          * (IEEE 802.11-2012 18.3.8.7)
 343          *
 344          * In 2.4GHz, we must always use long slots in IBSS for compatibility
 345          * reasons.
 346          * (IEEE 802.11-2012 19.4.5)
 347          *
 348          * HT follows these specifications (IEEE 802.11-2012 20.3.18)
 349          */
 350         sdata->vif.bss_conf.use_short_slot = chan->band == NL80211_BAND_5GHZ;
 351         bss_change |= BSS_CHANGED_ERP_SLOT;
 352
 353         /* cf. IEEE 802.11 9.2.12 */
 354         sdata->deflink.operating_11g_mode =
 355                 chan->band == NL80211_BAND_2GHZ && have_higher_than_11mbit;
 356
 357         ieee80211_set_wmm_default(&sdata->deflink, true, false);
 358
 359         sdata->vif.cfg.ibss_joined = true;
 360         sdata->vif.cfg.ibss_creator = creator;
 361
 362         err = drv_join_ibss(local, sdata);
 363         if (err) {
 364                 sdata->vif.cfg.ibss_joined = false;
 365                 sdata->vif.cfg.ibss_creator = false;
 366                 sdata->vif.bss_conf.enable_beacon = false;
 367                 sdata->vif.cfg.ssid_len = 0;
 368                 RCU_INIT_POINTER(ifibss->presp, NULL);
 369                 kfree_rcu(presp, rcu_head);
 370                 mutex_lock(&local->mtx);
 371                 ieee80211_link_release_channel(&sdata->deflink);
 372                 mutex_unlock(&local->mtx);
 373                 sdata_info(sdata, "Failed to join IBSS, driver failure: %d\n",
 374                            err);
 375                 return;
 376         }
 377
 378         ieee80211_bss_info_change_notify(sdata, bss_change);
 379
 380         ifibss->state = IEEE80211_IBSS_MLME_JOINED;
 381         mod_timer(&ifibss->timer,
 382                   round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
 383
 384         bss_meta.chan = chan;
 385         bss_meta.scan_width = cfg80211_chandef_to_scan_width(&chandef);
 386         bss = cfg80211_inform_bss_frame_data(local->hw.wiphy, &bss_meta, mgmt,
 387                                              presp->head_len, GFP_KERNEL);
 388
 389         cfg80211_put_bss(local->hw.wiphy, bss);
 390         netif_carrier_on(sdata->dev);
 391         cfg80211_ibss_joined(sdata->dev, ifibss->bssid, chan, GFP_KERNEL);
 392 }
 393
 394 static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
 395                                     struct ieee80211_bss *bss)
 396 {
 397         struct cfg80211_bss *cbss =
 398                 container_of((void *)bss, struct cfg80211_bss, priv);
 399         struct ieee80211_supported_band *sband;
 400         struct cfg80211_chan_def chandef;
 401         u32 basic_rates;
 402         int i, j;
 403         u16 beacon_int = cbss->beacon_interval;
 404         const struct cfg80211_bss_ies *ies;
 405         enum nl80211_channel_type chan_type;
 406         u64 tsf;
 407         u32 rate_flags;
 408         int shift;
 409
 410         sdata_assert_lock(sdata);
 411
 412         if (beacon_int < 10)
 413                 beacon_int = 10;
 414
 415         switch (sdata->u.ibss.chandef.width) {
 416         case NL80211_CHAN_WIDTH_20_NOHT:
 417         case NL80211_CHAN_WIDTH_20:
 418         case NL80211_CHAN_WIDTH_40:
 419                 chan_type = cfg80211_get_chandef_type(&sdata->u.ibss.chandef);
 420                 cfg80211_chandef_create(&chandef, cbss->channel, chan_type);
 421                 break;
 422         case NL80211_CHAN_WIDTH_5:
 423         case NL80211_CHAN_WIDTH_10:
 424                 cfg80211_chandef_create(&chandef, cbss->channel,
 425                                         NL80211_CHAN_NO_HT);
 426                 chandef.width = sdata->u.ibss.chandef.width;
 427                 break;
 428         case NL80211_CHAN_WIDTH_80:
 429         case NL80211_CHAN_WIDTH_80P80:
 430         case NL80211_CHAN_WIDTH_160:
 431                 chandef = sdata->u.ibss.chandef;
 432                 chandef.chan = cbss->channel;
 433                 break;
 434         default:
 435                 /* fall back to 20 MHz for unsupported modes */
 436                 cfg80211_chandef_create(&chandef, cbss->channel,
 437                                         NL80211_CHAN_NO_HT);
 438                 break;
 439         }
 440
 441         sband = sdata->local->hw.wiphy->bands[cbss->channel->band];
 442         rate_flags = ieee80211_chandef_rate_flags(&sdata->u.ibss.chandef);
 443         shift = ieee80211_vif_get_shift(&sdata->vif);
 444
 445         basic_rates = 0;
 446
 447         for (i = 0; i < bss->supp_rates_len; i++) {
 448                 int rate = bss->supp_rates[i] & 0x7f;
 449                 bool is_basic = !!(bss->supp_rates[i] & 0x80);
 450
 451                 for (j = 0; j < sband->n_bitrates; j++) {
 452                         int brate;
 453                         if ((rate_flags & sband->bitrates[j].flags)
 454                             != rate_flags)
 455                                 continue;
 456
 457                         brate = DIV_ROUND_UP(sband->bitrates[j].bitrate,
 458                                              5 * (1 << shift));
 459                         if (brate == rate) {
 460                                 if (is_basic)
 461                                         basic_rates |= BIT(j);
 462                                 break;
 463                         }
 464                 }
 465         }
 466
 467         rcu_read_lock();
 468         ies = rcu_dereference(cbss->ies);
 469         tsf = ies->tsf;
 470         rcu_read_unlock();
 471
 472         __ieee80211_sta_join_ibss(sdata, cbss->bssid,
 473                                   beacon_int,
 474                                   &chandef,
 475                                   basic_rates,
 476                                   cbss->capability,
 477                                   tsf, false);
 478 }
 479
 480 int ieee80211_ibss_csa_beacon(struct ieee80211_sub_if_data *sdata,
 481                               struct cfg80211_csa_settings *csa_settings)
 482 {
 483         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 484         struct beacon_data *presp, *old_presp;
 485         struct cfg80211_bss *cbss;
 486         const struct cfg80211_bss_ies *ies;
 487         u16 capability = WLAN_CAPABILITY_IBSS;
 488         u64 tsf;
 489
 490         sdata_assert_lock(sdata);
 491
 492         if (ifibss->privacy)
 493                 capability |= WLAN_CAPABILITY_PRIVACY;
 494
 495         cbss = cfg80211_get_bss(sdata->local->hw.wiphy, ifibss->chandef.chan,
 496                                 ifibss->bssid, ifibss->ssid,
 497                                 ifibss->ssid_len, IEEE80211_BSS_TYPE_IBSS,
 498                                 IEEE80211_PRIVACY(ifibss->privacy));
 499
 500         if (WARN_ON(!cbss))
 501                 return -EINVAL;
 502
 503         rcu_read_lock();
 504         ies = rcu_dereference(cbss->ies);
 505         tsf = ies->tsf;
 506         rcu_read_unlock();
 507         cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
 508
 509         old_presp = sdata_dereference(ifibss->presp, sdata);
 510
 511         presp = ieee80211_ibss_build_presp(sdata,
 512                                            sdata->vif.bss_conf.beacon_int,
 513                                            sdata->vif.bss_conf.basic_rates,
 514                                            capability, tsf, &ifibss->chandef,
 515                                            NULL, csa_settings);
 516         if (!presp)
 517                 return -ENOMEM;
 518
 519         rcu_assign_pointer(ifibss->presp, presp);
 520         if (old_presp)
 521                 kfree_rcu(old_presp, rcu_head);
 522
 523         return BSS_CHANGED_BEACON;
 524 }
 525
 526 int ieee80211_ibss_finish_csa(struct ieee80211_sub_if_data *sdata)
 527 {
 528         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 529         struct cfg80211_bss *cbss;
 530
 531         sdata_assert_lock(sdata);
 532
 533         /* update cfg80211 bss information with the new channel */
 534         if (!is_zero_ether_addr(ifibss->bssid)) {
 535                 cbss = cfg80211_get_bss(sdata->local->hw.wiphy,
 536                                         ifibss->chandef.chan,
 537                                         ifibss->bssid, ifibss->ssid,
 538                                         ifibss->ssid_len,
 539                                         IEEE80211_BSS_TYPE_IBSS,
 540                                         IEEE80211_PRIVACY(ifibss->privacy));
 541                 /* XXX: should not really modify cfg80211 data */
 542                 if (cbss) {
 543                         cbss->channel = sdata->deflink.csa_chandef.chan;
 544                         cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
 545                 }
 546         }
 547
 548         ifibss->chandef = sdata->deflink.csa_chandef;
 549
 550         /* generate the beacon */
 551         return ieee80211_ibss_csa_beacon(sdata, NULL);
 552 }
 553
 554 void ieee80211_ibss_stop(struct ieee80211_sub_if_data *sdata)
 555 {
 556         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 557
 558         cancel_work_sync(&ifibss->csa_connection_drop_work);
 559 }
 560
 561 static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta)
 562         __acquires(RCU)
 563 {
 564         struct ieee80211_sub_if_data *sdata = sta->sdata;
 565         u8 addr[ETH_ALEN];
 566
 567         memcpy(addr, sta->sta.addr, ETH_ALEN);
 568
 569         ibss_dbg(sdata, "Adding new IBSS station %pM\n", addr);
 570
 571         sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
 572         sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
 573         /* authorize the station only if the network is not RSN protected. If
 574          * not wait for the userspace to authorize it */
 575         if (!sta->sdata->u.ibss.control_port)
 576                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
 577
 578         rate_control_rate_init(sta);
 579
 580         /* If it fails, maybe we raced another insertion? */
 581         if (sta_info_insert_rcu(sta))
 582                 return sta_info_get(sdata, addr);
 583         return sta;
 584 }
 585
 586 static struct sta_info *
 587 ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, const u8 *bssid,
 588                        const u8 *addr, u32 supp_rates)
 589         __acquires(RCU)
 590 {
 591         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 592         struct ieee80211_local *local = sdata->local;
 593         struct sta_info *sta;
 594         struct ieee80211_chanctx_conf *chanctx_conf;
 595         struct ieee80211_supported_band *sband;
 596         enum nl80211_bss_scan_width scan_width;
 597         int band;
 598
 599         /*
 600          * XXX: Consider removing the least recently used entry and
 601          *      allow new one to be added.
 602          */
 603         if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
 604                 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
 605                                     sdata->name, addr);
 606                 rcu_read_lock();
 607                 return NULL;
 608         }
 609
 610         if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) {
 611                 rcu_read_lock();
 612                 return NULL;
 613         }
 614
 615         if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) {
 616                 rcu_read_lock();
 617                 return NULL;
 618         }
 619
 620         rcu_read_lock();
 621         chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
 622         if (WARN_ON_ONCE(!chanctx_conf))
 623                 return NULL;
 624         band = chanctx_conf->def.chan->band;
 625         scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
 626         rcu_read_unlock();
 627
 628         sta = sta_info_alloc(sdata, addr, GFP_KERNEL);
 629         if (!sta) {
 630                 rcu_read_lock();
 631                 return NULL;
 632         }
 633
 634         /* make sure mandatory rates are always added */
 635         sband = local->hw.wiphy->bands[band];
 636         sta->sta.deflink.supp_rates[band] = supp_rates |
 637                         ieee80211_mandatory_rates(sband, scan_width);
 638
 639         return ieee80211_ibss_finish_sta(sta);
 640 }
 641
 642 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
 643 {
 644         struct ieee80211_local *local = sdata->local;
 645         int active = 0;
 646         struct sta_info *sta;
 647
 648         sdata_assert_lock(sdata);
 649
 650         rcu_read_lock();
 651
 652         list_for_each_entry_rcu(sta, &local->sta_list, list) {
 653                 unsigned long last_active = ieee80211_sta_last_active(sta);
 654
 655                 if (sta->sdata == sdata &&
 656                     time_is_after_jiffies(last_active +
 657                                           IEEE80211_IBSS_MERGE_INTERVAL)) {
 658                         active++;
 659                         break;
 660                 }
 661         }
 662
 663         rcu_read_unlock();
 664
 665         return active;
 666 }
 667
 668 static void ieee80211_ibss_disconnect(struct ieee80211_sub_if_data *sdata)
 669 {
 670         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 671         struct ieee80211_local *local = sdata->local;
 672         struct cfg80211_bss *cbss;
 673         struct beacon_data *presp;
 674         struct sta_info *sta;
 675
 676         if (!is_zero_ether_addr(ifibss->bssid)) {
 677                 cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->chandef.chan,
 678                                         ifibss->bssid, ifibss->ssid,
 679                                         ifibss->ssid_len,
 680                                         IEEE80211_BSS_TYPE_IBSS,
 681                                         IEEE80211_PRIVACY(ifibss->privacy));
 682
 683                 if (cbss) {
 684                         cfg80211_unlink_bss(local->hw.wiphy, cbss);
 685                         cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
 686                 }
 687         }
 688
 689         ifibss->state = IEEE80211_IBSS_MLME_SEARCH;
 690
 691         sta_info_flush(sdata);
 692
 693         spin_lock_bh(&ifibss->incomplete_lock);
 694         while (!list_empty(&ifibss->incomplete_stations)) {
 695                 sta = list_first_entry(&ifibss->incomplete_stations,
 696                                        struct sta_info, list);
 697                 list_del(&sta->list);
 698                 spin_unlock_bh(&ifibss->incomplete_lock);
 699
 700                 sta_info_free(local, sta);
 701                 spin_lock_bh(&ifibss->incomplete_lock);
 702         }
 703         spin_unlock_bh(&ifibss->incomplete_lock);
 704
 705         netif_carrier_off(sdata->dev);
 706
 707         sdata->vif.cfg.ibss_joined = false;
 708         sdata->vif.cfg.ibss_creator = false;
 709         sdata->vif.bss_conf.enable_beacon = false;
 710         sdata->vif.cfg.ssid_len = 0;
 711
 712         /* remove beacon */
 713         presp = sdata_dereference(ifibss->presp, sdata);
 714         RCU_INIT_POINTER(sdata->u.ibss.presp, NULL);
 715         if (presp)
 716                 kfree_rcu(presp, rcu_head);
 717
 718         clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state);
 719         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED |
 720                                                 BSS_CHANGED_IBSS);
 721         drv_leave_ibss(local, sdata);
 722         mutex_lock(&local->mtx);
 723         ieee80211_link_release_channel(&sdata->deflink);
 724         mutex_unlock(&local->mtx);
 725 }
 726
 727 static void ieee80211_csa_connection_drop_work(struct work_struct *work)
 728 {
 729         struct ieee80211_sub_if_data *sdata =
 730                 container_of(work, struct ieee80211_sub_if_data,
 731                              u.ibss.csa_connection_drop_work);
 732
 733         sdata_lock(sdata);
 734
 735         ieee80211_ibss_disconnect(sdata);
 736         synchronize_rcu();
 737         skb_queue_purge(&sdata->skb_queue);
 738
 739         /* trigger a scan to find another IBSS network to join */
 740         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
 741
 742         sdata_unlock(sdata);
 743 }
 744
 745 static void ieee80211_ibss_csa_mark_radar(struct ieee80211_sub_if_data *sdata)
 746 {
 747         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 748         int err;
 749
 750         /* if the current channel is a DFS channel, mark the channel as
 751          * unavailable.
 752          */
 753         err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
 754                                             &ifibss->chandef,
 755                                             NL80211_IFTYPE_ADHOC);
 756         if (err > 0)
 757                 cfg80211_radar_event(sdata->local->hw.wiphy, &ifibss->chandef,
 758                                      GFP_ATOMIC);
 759 }
 760
 761 static bool
 762 ieee80211_ibss_process_chanswitch(struct ieee80211_sub_if_data *sdata,
 763                                   struct ieee802_11_elems *elems,
 764                                   bool beacon)
 765 {
 766         struct cfg80211_csa_settings params;
 767         struct ieee80211_csa_ie csa_ie;
 768         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 769         enum nl80211_channel_type ch_type;
 770         int err;
 771         ieee80211_conn_flags_t conn_flags;
 772         u32 vht_cap_info = 0;
 773
 774         sdata_assert_lock(sdata);
 775
 776         conn_flags = IEEE80211_CONN_DISABLE_VHT;
 777
 778         switch (ifibss->chandef.width) {
 779         case NL80211_CHAN_WIDTH_5:
 780         case NL80211_CHAN_WIDTH_10:
 781         case NL80211_CHAN_WIDTH_20_NOHT:
 782                 conn_flags |= IEEE80211_CONN_DISABLE_HT;
 783                 fallthrough;
 784         case NL80211_CHAN_WIDTH_20:
 785                 conn_flags |= IEEE80211_CONN_DISABLE_40MHZ;
 786                 break;
 787         default:
 788                 break;
 789         }
 790
 791         if (elems->vht_cap_elem)
 792                 vht_cap_info = le32_to_cpu(elems->vht_cap_elem->vht_cap_info);
 793
 794         memset(&params, 0, sizeof(params));
 795         err = ieee80211_parse_ch_switch_ie(sdata, elems,
 796                                            ifibss->chandef.chan->band,
 797                                            vht_cap_info,
 798                                            conn_flags, ifibss->bssid, &csa_ie);
 799         /* can't switch to destination channel, fail */
 800         if (err < 0)
 801                 goto disconnect;
 802
 803         /* did not contain a CSA */
 804         if (err)
 805                 return false;
 806
 807         /* channel switch is not supported, disconnect */
 808         if (!(sdata->local->hw.wiphy->flags & WIPHY_FLAG_HAS_CHANNEL_SWITCH))
 809                 goto disconnect;
 810
 811         params.count = csa_ie.count;
 812         params.chandef = csa_ie.chandef;
 813
 814         switch (ifibss->chandef.width) {
 815         case NL80211_CHAN_WIDTH_20_NOHT:
 816         case NL80211_CHAN_WIDTH_20:
 817         case NL80211_CHAN_WIDTH_40:
 818                 /* keep our current HT mode (HT20/HT40+/HT40-), even if
 819                  * another mode  has been announced. The mode is not adopted
 820                  * within the beacon while doing CSA and we should therefore
 821                  * keep the mode which we announce.
 822                  */
 823                 ch_type = cfg80211_get_chandef_type(&ifibss->chandef);
 824                 cfg80211_chandef_create(&params.chandef, params.chandef.chan,
 825                                         ch_type);
 826                 break;
 827         case NL80211_CHAN_WIDTH_5:
 828         case NL80211_CHAN_WIDTH_10:
 829                 if (params.chandef.width != ifibss->chandef.width) {
 830                         sdata_info(sdata,
 831                                    "IBSS %pM received channel switch from incompatible channel width (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
 832                                    ifibss->bssid,
 833                                    params.chandef.chan->center_freq,
 834                                    params.chandef.width,
 835                                    params.chandef.center_freq1,
 836                                    params.chandef.center_freq2);
 837                         goto disconnect;
 838                 }
 839                 break;
 840         default:
 841                 /* should not happen, conn_flags should prevent VHT modes. */
 842                 WARN_ON(1);
 843                 goto disconnect;
 844         }
 845
 846         if (!cfg80211_reg_can_beacon(sdata->local->hw.wiphy, &params.chandef,
 847                                      NL80211_IFTYPE_ADHOC)) {
 848                 sdata_info(sdata,
 849                            "IBSS %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
 850                            ifibss->bssid,
 851                            params.chandef.chan->center_freq,
 852                            params.chandef.width,
 853                            params.chandef.center_freq1,
 854                            params.chandef.center_freq2);
 855                 goto disconnect;
 856         }
 857
 858         err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
 859                                             &params.chandef,
 860                                             NL80211_IFTYPE_ADHOC);
 861         if (err < 0)
 862                 goto disconnect;
 863         if (err > 0 && !ifibss->userspace_handles_dfs) {
 864                 /* IBSS-DFS only allowed with a control program */
 865                 goto disconnect;
 866         }
 867
 868         params.radar_required = err;
 869
 870         if (cfg80211_chandef_identical(&params.chandef,
 871                                        &sdata->vif.bss_conf.chandef)) {
 872                 ibss_dbg(sdata,
 873                          "received csa with an identical chandef, ignoring\n");
 874                 return true;
 875         }
 876
 877         /* all checks done, now perform the channel switch. */
 878         ibss_dbg(sdata,
 879                  "received channel switch announcement to go to channel %d MHz\n",
 880                  params.chandef.chan->center_freq);
 881
 882         params.block_tx = !!csa_ie.mode;
 883
 884         if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev,
 885                                      &params))
 886                 goto disconnect;
 887
 888         ieee80211_ibss_csa_mark_radar(sdata);
 889
 890         return true;
 891 disconnect:
 892         ibss_dbg(sdata, "Can't handle channel switch, disconnect\n");
 893         ieee80211_queue_work(&sdata->local->hw,
 894                              &ifibss->csa_connection_drop_work);
 895
 896         ieee80211_ibss_csa_mark_radar(sdata);
 897
 898         return true;
 899 }
 900
 901 static void
 902 ieee80211_rx_mgmt_spectrum_mgmt(struct ieee80211_sub_if_data *sdata,
 903                                 struct ieee80211_mgmt *mgmt, size_t len,
 904                                 struct ieee80211_rx_status *rx_status,
 905                                 struct ieee802_11_elems *elems)
 906 {
 907         int required_len;
 908
 909         if (len < IEEE80211_MIN_ACTION_SIZE + 1)
 910                 return;
 911
 912         /* CSA is the only action we handle for now */
 913         if (mgmt->u.action.u.measurement.action_code !=
 914             WLAN_ACTION_SPCT_CHL_SWITCH)
 915                 return;
 916
 917         required_len = IEEE80211_MIN_ACTION_SIZE +
 918                        sizeof(mgmt->u.action.u.chan_switch);
 919         if (len < required_len)
 920                 return;
 921
 922         if (!sdata->vif.bss_conf.csa_active)
 923                 ieee80211_ibss_process_chanswitch(sdata, elems, false);
 924 }
 925
 926 static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data *sdata,
 927                                           struct ieee80211_mgmt *mgmt,
 928                                           size_t len)
 929 {
 930         u16 reason = le16_to_cpu(mgmt->u.deauth.reason_code);
 931
 932         if (len < IEEE80211_DEAUTH_FRAME_LEN)
 933                 return;
 934
 935         ibss_dbg(sdata, "RX DeAuth SA=%pM DA=%pM\n", mgmt->sa, mgmt->da);
 936         ibss_dbg(sdata, "\tBSSID=%pM (reason: %d)\n", mgmt->bssid, reason);
 937         sta_info_destroy_addr(sdata, mgmt->sa);
 938 }
 939
 940 static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata,
 941                                         struct ieee80211_mgmt *mgmt,
 942                                         size_t len)
 943 {
 944         u16 auth_alg, auth_transaction;
 945
 946         sdata_assert_lock(sdata);
 947
 948         if (len < 24 + 6)
 949                 return;
 950
 951         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
 952         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
 953
 954         ibss_dbg(sdata, "RX Auth SA=%pM DA=%pM\n", mgmt->sa, mgmt->da);
 955         ibss_dbg(sdata, "\tBSSID=%pM (auth_transaction=%d)\n",
 956                  mgmt->bssid, auth_transaction);
 957
 958         if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
 959                 return;
 960
 961         /*
 962          * IEEE 802.11 standard does not require authentication in IBSS
 963          * networks and most implementations do not seem to use it.
 964          * However, try to reply to authentication attempts if someone
 965          * has actually implemented this.
 966          */
 967         ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, 0, NULL, 0,
 968                             mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0, 0);
 969 }
 970
 971 static void ieee80211_update_sta_info(struct ieee80211_sub_if_data *sdata,
 972                                       struct ieee80211_mgmt *mgmt, size_t len,
 973                                       struct ieee80211_rx_status *rx_status,
 974                                       struct ieee802_11_elems *elems,
 975                                       struct ieee80211_channel *channel)
 976 {
 977         struct sta_info *sta;
 978         enum nl80211_band band = rx_status->band;
 979         enum nl80211_bss_scan_width scan_width;
 980         struct ieee80211_local *local = sdata->local;
 981         struct ieee80211_supported_band *sband;
 982         bool rates_updated = false;
 983         u32 supp_rates = 0;
 984
 985         if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
 986                 return;
 987
 988         if (!ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid))
 989                 return;
 990
 991         sband = local->hw.wiphy->bands[band];
 992         if (WARN_ON(!sband))
 993                 return;
 994
 995         rcu_read_lock();
 996         sta = sta_info_get(sdata, mgmt->sa);
 997
 998         if (elems->supp_rates) {
 999                 supp_rates = ieee80211_sta_get_rates(sdata, elems,
1000                                                      band, NULL);
1001                 if (sta) {
1002                         u32 prev_rates;
1003
1004                         prev_rates = sta->sta.deflink.supp_rates[band];
1005                         /* make sure mandatory rates are always added */
1006                         scan_width = NL80211_BSS_CHAN_WIDTH_20;
1007                         if (rx_status->bw == RATE_INFO_BW_5)
1008                                 scan_width = NL80211_BSS_CHAN_WIDTH_5;
1009                         else if (rx_status->bw == RATE_INFO_BW_10)
1010                                 scan_width = NL80211_BSS_CHAN_WIDTH_10;
1011
1012                         sta->sta.deflink.supp_rates[band] = supp_rates |
1013                                 ieee80211_mandatory_rates(sband, scan_width);
1014                         if (sta->sta.deflink.supp_rates[band] != prev_rates) {
1015                                 ibss_dbg(sdata,
1016                                          "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n",
1017                                          sta->sta.addr, prev_rates,
1018                                          sta->sta.deflink.supp_rates[band]);
1019                                 rates_updated = true;
1020                         }
1021                 } else {
1022                         rcu_read_unlock();
1023                         sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid,
1024                                                      mgmt->sa, supp_rates);
1025                 }
1026         }
1027
1028         if (sta && !sta->sta.wme &&
1029             (elems->wmm_info || elems->s1g_capab) &&
1030             local->hw.queues >= IEEE80211_NUM_ACS) {
1031                 sta->sta.wme = true;
1032                 ieee80211_check_fast_xmit(sta);
1033         }
1034
1035         if (sta && elems->ht_operation && elems->ht_cap_elem &&
1036             sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20_NOHT &&
1037             sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_5 &&
1038             sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_10) {
1039                 /* we both use HT */
1040                 struct ieee80211_ht_cap htcap_ie;
1041                 struct cfg80211_chan_def chandef;
1042                 enum ieee80211_sta_rx_bandwidth bw = sta->sta.deflink.bandwidth;
1043
1044                 cfg80211_chandef_create(&chandef, channel, NL80211_CHAN_NO_HT);
1045                 ieee80211_chandef_ht_oper(elems->ht_operation, &chandef);
1046
1047                 memcpy(&htcap_ie, elems->ht_cap_elem, sizeof(htcap_ie));
1048                 rates_updated |= ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
1049                                                                    &htcap_ie,
1050                                                                    &sta->deflink);
1051
1052                 if (elems->vht_operation && elems->vht_cap_elem &&
1053                     sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20 &&
1054                     sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_40) {
1055                         /* we both use VHT */
1056                         struct ieee80211_vht_cap cap_ie;
1057                         struct ieee80211_sta_vht_cap cap = sta->sta.deflink.vht_cap;
1058                         u32 vht_cap_info =
1059                                 le32_to_cpu(elems->vht_cap_elem->vht_cap_info);
1060
1061                         ieee80211_chandef_vht_oper(&local->hw, vht_cap_info,
1062                                                    elems->vht_operation,
1063                                                    elems->ht_operation,
1064                                                    &chandef);
1065                         memcpy(&cap_ie, elems->vht_cap_elem, sizeof(cap_ie));
1066                         ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
1067                                                             &cap_ie,
1068                                                             &sta->deflink);
1069                         if (memcmp(&cap, &sta->sta.deflink.vht_cap, sizeof(cap)))
1070                                 rates_updated |= true;
1071                 }
1072
1073                 if (bw != sta->sta.deflink.bandwidth)
1074                         rates_updated |= true;
1075
1076                 if (!cfg80211_chandef_compatible(&sdata->u.ibss.chandef,
1077                                                  &chandef))
1078                         WARN_ON_ONCE(1);
1079         }
1080
1081         if (sta && rates_updated) {
1082                 u32 changed = IEEE80211_RC_SUPP_RATES_CHANGED;
1083                 u8 rx_nss = sta->sta.deflink.rx_nss;
1084
1085                 /* Force rx_nss recalculation */
1086                 sta->sta.deflink.rx_nss = 0;
1087                 rate_control_rate_init(sta);
1088                 if (sta->sta.deflink.rx_nss != rx_nss)
1089                         changed |= IEEE80211_RC_NSS_CHANGED;
1090
1091                 drv_sta_rc_update(local, sdata, &sta->sta, changed);
1092         }
1093
1094         rcu_read_unlock();
1095 }
1096
1097 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1098                                   struct ieee80211_mgmt *mgmt, size_t len,
1099                                   struct ieee80211_rx_status *rx_status,
1100                                   struct ieee802_11_elems *elems)
1101 {
1102         struct ieee80211_local *local = sdata->local;
1103         struct cfg80211_bss *cbss;
1104         struct ieee80211_bss *bss;
1105         struct ieee80211_channel *channel;
1106         u64 beacon_timestamp, rx_timestamp;
1107         u32 supp_rates = 0;
1108         enum nl80211_band band = rx_status->band;
1109
1110         channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
1111         if (!channel)
1112                 return;
1113
1114         ieee80211_update_sta_info(sdata, mgmt, len, rx_status, elems, channel);
1115
1116         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, channel);
1117         if (!bss)
1118                 return;
1119
1120         cbss = container_of((void *)bss, struct cfg80211_bss, priv);
1121
1122         /* same for beacon and probe response */
1123         beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp);
1124
1125         /* check if we need to merge IBSS */
1126
1127         /* not an IBSS */
1128         if (!(cbss->capability & WLAN_CAPABILITY_IBSS))
1129                 goto put_bss;
1130
1131         /* different channel */
1132         if (sdata->u.ibss.fixed_channel &&
1133             sdata->u.ibss.chandef.chan != cbss->channel)
1134                 goto put_bss;
1135
1136         /* different SSID */
1137         if (elems->ssid_len != sdata->u.ibss.ssid_len ||
1138             memcmp(elems->ssid, sdata->u.ibss.ssid,
1139                                 sdata->u.ibss.ssid_len))
1140                 goto put_bss;
1141
1142         /* process channel switch */
1143         if (sdata->vif.bss_conf.csa_active ||
1144             ieee80211_ibss_process_chanswitch(sdata, elems, true))
1145                 goto put_bss;
1146
1147         /* same BSSID */
1148         if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid))
1149                 goto put_bss;
1150
1151         /* we use a fixed BSSID */
1152         if (sdata->u.ibss.fixed_bssid)
1153                 goto put_bss;
1154
1155         if (ieee80211_have_rx_timestamp(rx_status)) {
1156                 /* time when timestamp field was received */
1157                 rx_timestamp =
1158                         ieee80211_calculate_rx_timestamp(local, rx_status,
1159                                                          len + FCS_LEN, 24);
1160         } else {
1161                 /*
1162                  * second best option: get current TSF
1163                  * (will return -1 if not supported)
1164                  */
1165                 rx_timestamp = drv_get_tsf(local, sdata);
1166         }
1167
1168         ibss_dbg(sdata, "RX beacon SA=%pM BSSID=%pM TSF=0x%llx\n",
1169                  mgmt->sa, mgmt->bssid,
1170                  (unsigned long long)rx_timestamp);
1171         ibss_dbg(sdata, "\tBCN=0x%llx diff=%lld @%lu\n",
1172                  (unsigned long long)beacon_timestamp,
1173                  (unsigned long long)(rx_timestamp - beacon_timestamp),
1174                  jiffies);
1175
1176         if (beacon_timestamp > rx_timestamp) {
1177                 ibss_dbg(sdata,
1178                          "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n",
1179                          mgmt->bssid);
1180                 ieee80211_sta_join_ibss(sdata, bss);
1181                 supp_rates = ieee80211_sta_get_rates(sdata, elems, band, NULL);
1182                 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa,
1183                                        supp_rates);
1184                 rcu_read_unlock();
1185         }
1186
1187  put_bss:
1188         ieee80211_rx_bss_put(local, bss);
1189 }
1190
1191 void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata,
1192                               const u8 *bssid, const u8 *addr,
1193                               u32 supp_rates)
1194 {
1195         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1196         struct ieee80211_local *local = sdata->local;
1197         struct sta_info *sta;
1198         struct ieee80211_chanctx_conf *chanctx_conf;
1199         struct ieee80211_supported_band *sband;
1200         enum nl80211_bss_scan_width scan_width;
1201         int band;
1202
1203         /*
1204          * XXX: Consider removing the least recently used entry and
1205          *      allow new one to be added.
1206          */
1207         if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
1208                 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
1209                                     sdata->name, addr);
1210                 return;
1211         }
1212
1213         if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH)
1214                 return;
1215
1216         if (!ether_addr_equal(bssid, sdata->u.ibss.bssid))
1217                 return;
1218
1219         rcu_read_lock();
1220         chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
1221         if (WARN_ON_ONCE(!chanctx_conf)) {
1222                 rcu_read_unlock();
1223                 return;
1224         }
1225         band = chanctx_conf->def.chan->band;
1226         scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
1227         rcu_read_unlock();
1228
1229         sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
1230         if (!sta)
1231                 return;
1232
1233         /* make sure mandatory rates are always added */
1234         sband = local->hw.wiphy->bands[band];
1235         sta->sta.deflink.supp_rates[band] = supp_rates |
1236                         ieee80211_mandatory_rates(sband, scan_width);
1237
1238         spin_lock(&ifibss->incomplete_lock);
1239         list_add(&sta->list, &ifibss->incomplete_stations);
1240         spin_unlock(&ifibss->incomplete_lock);
1241         ieee80211_queue_work(&local->hw, &sdata->work);
1242 }
1243
1244 static void ieee80211_ibss_sta_expire(struct ieee80211_sub_if_data *sdata)
1245 {
1246         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1247         struct ieee80211_local *local = sdata->local;
1248         struct sta_info *sta, *tmp;
1249         unsigned long exp_time = IEEE80211_IBSS_INACTIVITY_LIMIT;
1250         unsigned long exp_rsn = IEEE80211_IBSS_RSN_INACTIVITY_LIMIT;
1251
1252         mutex_lock(&local->sta_mtx);
1253
1254         list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
1255                 unsigned long last_active = ieee80211_sta_last_active(sta);
1256
1257                 if (sdata != sta->sdata)
1258                         continue;
1259
1260                 if (time_is_before_jiffies(last_active + exp_time) ||
1261                     (time_is_before_jiffies(last_active + exp_rsn) &&
1262                      sta->sta_state != IEEE80211_STA_AUTHORIZED)) {
1263                         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
1264
1265                         sta_dbg(sta->sdata, "expiring inactive %sSTA %pM\n",
1266                                 sta->sta_state != IEEE80211_STA_AUTHORIZED ?
1267                                 "not authorized " : "", sta->sta.addr);
1268
1269                         ieee80211_send_deauth_disassoc(sdata, sta->sta.addr,
1270                                                        ifibss->bssid,
1271                                                        IEEE80211_STYPE_DEAUTH,
1272                                                        WLAN_REASON_DEAUTH_LEAVING,
1273                                                        true, frame_buf);
1274                         WARN_ON(__sta_info_destroy(sta));
1275                 }
1276         }
1277
1278         mutex_unlock(&local->sta_mtx);
1279 }
1280
1281 /*
1282  * This function is called with state == IEEE80211_IBSS_MLME_JOINED
1283  */
1284
1285 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
1286 {
1287         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1288         enum nl80211_bss_scan_width scan_width;
1289
1290         sdata_assert_lock(sdata);
1291
1292         mod_timer(&ifibss->timer,
1293                   round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
1294
1295         ieee80211_ibss_sta_expire(sdata);
1296
1297         if (time_before(jiffies, ifibss->last_scan_completed +
1298                        IEEE80211_IBSS_MERGE_INTERVAL))
1299                 return;
1300
1301         if (ieee80211_sta_active_ibss(sdata))
1302                 return;
1303
1304         if (ifibss->fixed_channel)
1305                 return;
1306
1307         sdata_info(sdata,
1308                    "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n");
1309
1310         scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
1311         ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len,
1312                                     NULL, 0, scan_width);
1313 }
1314
1315 static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
1316 {
1317         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1318         u8 bssid[ETH_ALEN];
1319         u16 capability;
1320         int i;
1321
1322         sdata_assert_lock(sdata);
1323
1324         if (ifibss->fixed_bssid) {
1325                 memcpy(bssid, ifibss->bssid, ETH_ALEN);
1326         } else {
1327                 /* Generate random, not broadcast, locally administered BSSID. Mix in
1328                  * own MAC address to make sure that devices that do not have proper
1329                  * random number generator get different BSSID. */
1330                 get_random_bytes(bssid, ETH_ALEN);
1331                 for (i = 0; i < ETH_ALEN; i++)
1332                         bssid[i] ^= sdata->vif.addr[i];
1333                 bssid[0] &= ~0x01;
1334                 bssid[0] |= 0x02;
1335         }
1336
1337         sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid);
1338
1339         capability = WLAN_CAPABILITY_IBSS;
1340
1341         if (ifibss->privacy)
1342                 capability |= WLAN_CAPABILITY_PRIVACY;
1343
1344         __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int,
1345                                   &ifibss->chandef, ifibss->basic_rates,
1346                                   capability, 0, true);
1347 }
1348
1349 static unsigned ibss_setup_channels(struct wiphy *wiphy,
1350                                     struct ieee80211_channel **channels,
1351                                     unsigned int channels_max,
1352                                     u32 center_freq, u32 width)
1353 {
1354         struct ieee80211_channel *chan = NULL;
1355         unsigned int n_chan = 0;
1356         u32 start_freq, end_freq, freq;
1357
1358         if (width <= 20) {
1359                 start_freq = center_freq;
1360                 end_freq = center_freq;
1361         } else {
1362                 start_freq = center_freq - width / 2 + 10;
1363                 end_freq = center_freq + width / 2 - 10;
1364         }
1365
1366         for (freq = start_freq; freq <= end_freq; freq += 20) {
1367                 chan = ieee80211_get_channel(wiphy, freq);
1368                 if (!chan)
1369                         continue;
1370                 if (n_chan >= channels_max)
1371                         return n_chan;
1372
1373                 channels[n_chan] = chan;
1374                 n_chan++;
1375         }
1376
1377         return n_chan;
1378 }
1379
1380 static unsigned int
1381 ieee80211_ibss_setup_scan_channels(struct wiphy *wiphy,
1382                                    const struct cfg80211_chan_def *chandef,
1383                                    struct ieee80211_channel **channels,
1384                                    unsigned int channels_max)
1385 {
1386         unsigned int n_chan = 0;
1387         u32 width, cf1, cf2 = 0;
1388
1389         switch (chandef->width) {
1390         case NL80211_CHAN_WIDTH_40:
1391                 width = 40;
1392                 break;
1393         case NL80211_CHAN_WIDTH_80P80:
1394                 cf2 = chandef->center_freq2;
1395                 fallthrough;
1396         case NL80211_CHAN_WIDTH_80:
1397                 width = 80;
1398                 break;
1399         case NL80211_CHAN_WIDTH_160:
1400                 width = 160;
1401                 break;
1402         default:
1403                 width = 20;
1404                 break;
1405         }
1406
1407         cf1 = chandef->center_freq1;
1408
1409         n_chan = ibss_setup_channels(wiphy, channels, channels_max, cf1, width);
1410
1411         if (cf2)
1412                 n_chan += ibss_setup_channels(wiphy, &channels[n_chan],
1413                                               channels_max - n_chan, cf2,
1414                                               width);
1415
1416         return n_chan;
1417 }
1418
1419 /*
1420  * This function is called with state == IEEE80211_IBSS_MLME_SEARCH
1421  */
1422
1423 static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
1424 {
1425         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1426         struct ieee80211_local *local = sdata->local;
1427         struct cfg80211_bss *cbss;
1428         struct ieee80211_channel *chan = NULL;
1429         const u8 *bssid = NULL;
1430         enum nl80211_bss_scan_width scan_width;
1431         int active_ibss;
1432
1433         sdata_assert_lock(sdata);
1434
1435         active_ibss = ieee80211_sta_active_ibss(sdata);
1436         ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss);
1437
1438         if (active_ibss)
1439                 return;
1440
1441         if (ifibss->fixed_bssid)
1442                 bssid = ifibss->bssid;
1443         if (ifibss->fixed_channel)
1444                 chan = ifibss->chandef.chan;
1445         if (!is_zero_ether_addr(ifibss->bssid))
1446                 bssid = ifibss->bssid;
1447         cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid,
1448                                 ifibss->ssid, ifibss->ssid_len,
1449                                 IEEE80211_BSS_TYPE_IBSS,
1450                                 IEEE80211_PRIVACY(ifibss->privacy));
1451
1452         if (cbss) {
1453                 struct ieee80211_bss *bss;
1454
1455                 bss = (void *)cbss->priv;
1456                 ibss_dbg(sdata,
1457                          "sta_find_ibss: selected %pM current %pM\n",
1458                          cbss->bssid, ifibss->bssid);
1459                 sdata_info(sdata,
1460                            "Selected IBSS BSSID %pM based on configured SSID\n",
1461                            cbss->bssid);
1462
1463                 ieee80211_sta_join_ibss(sdata, bss);
1464                 ieee80211_rx_bss_put(local, bss);
1465                 return;
1466         }
1467
1468         /* if a fixed bssid and a fixed freq have been provided create the IBSS
1469          * directly and do not waste time scanning
1470          */
1471         if (ifibss->fixed_bssid && ifibss->fixed_channel) {
1472                 sdata_info(sdata, "Created IBSS using preconfigured BSSID %pM\n",
1473                            bssid);
1474                 ieee80211_sta_create_ibss(sdata);
1475                 return;
1476         }
1477
1478
1479         ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n");
1480
1481         /* Selected IBSS not found in current scan results - try to scan */
1482         if (time_after(jiffies, ifibss->last_scan_completed +
1483                                         IEEE80211_SCAN_INTERVAL)) {
1484                 struct ieee80211_channel *channels[8];
1485                 unsigned int num;
1486
1487                 sdata_info(sdata, "Trigger new scan to find an IBSS to join\n");
1488
1489                 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
1490
1491                 if (ifibss->fixed_channel) {
1492                         num = ieee80211_ibss_setup_scan_channels(local->hw.wiphy,
1493                                                                  &ifibss->chandef,
1494                                                                  channels,
1495                                                                  ARRAY_SIZE(channels));
1496                         ieee80211_request_ibss_scan(sdata, ifibss->ssid,
1497                                                     ifibss->ssid_len, channels,
1498                                                     num, scan_width);
1499                 } else {
1500                         ieee80211_request_ibss_scan(sdata, ifibss->ssid,
1501                                                     ifibss->ssid_len, NULL,
1502                                                     0, scan_width);
1503                 }
1504         } else {
1505                 int interval = IEEE80211_SCAN_INTERVAL;
1506
1507                 if (time_after(jiffies, ifibss->ibss_join_req +
1508                                IEEE80211_IBSS_JOIN_TIMEOUT))
1509                         ieee80211_sta_create_ibss(sdata);
1510
1511                 mod_timer(&ifibss->timer,
1512                           round_jiffies(jiffies + interval));
1513         }
1514 }
1515
1516 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
1517                                         struct sk_buff *req)
1518 {
1519         struct ieee80211_mgmt *mgmt = (void *)req->data;
1520         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1521         struct ieee80211_local *local = sdata->local;
1522         int tx_last_beacon, len = req->len;
1523         struct sk_buff *skb;
1524         struct beacon_data *presp;
1525         u8 *pos, *end;
1526
1527         sdata_assert_lock(sdata);
1528
1529         presp = sdata_dereference(ifibss->presp, sdata);
1530
1531         if (ifibss->state != IEEE80211_IBSS_MLME_JOINED ||
1532             len < 24 + 2 || !presp)
1533                 return;
1534
1535         tx_last_beacon = drv_tx_last_beacon(local);
1536
1537         ibss_dbg(sdata, "RX ProbeReq SA=%pM DA=%pM\n", mgmt->sa, mgmt->da);
1538         ibss_dbg(sdata, "\tBSSID=%pM (tx_last_beacon=%d)\n",
1539                  mgmt->bssid, tx_last_beacon);
1540
1541         if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da))
1542                 return;
1543
1544         if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) &&
1545             !is_broadcast_ether_addr(mgmt->bssid))
1546                 return;
1547
1548         end = ((u8 *) mgmt) + len;
1549         pos = mgmt->u.probe_req.variable;
1550         if (pos[0] != WLAN_EID_SSID ||
1551             pos + 2 + pos[1] > end) {
1552                 ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n",
1553                          mgmt->sa);
1554                 return;
1555         }
1556         if (pos[1] != 0 &&
1557             (pos[1] != ifibss->ssid_len ||
1558              memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) {
1559                 /* Ignore ProbeReq for foreign SSID */
1560                 return;
1561         }
1562
1563         /* Reply with ProbeResp */
1564         skb = dev_alloc_skb(local->tx_headroom + presp->head_len);
1565         if (!skb)
1566                 return;
1567
1568         skb_reserve(skb, local->tx_headroom);
1569         skb_put_data(skb, presp->head, presp->head_len);
1570
1571         memcpy(((struct ieee80211_mgmt *) skb->data)->da, mgmt->sa, ETH_ALEN);
1572         ibss_dbg(sdata, "Sending ProbeResp to %pM\n", mgmt->sa);
1573         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1574
1575         /* avoid excessive retries for probe request to wildcard SSIDs */
1576         if (pos[1] == 0)
1577                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_NO_ACK;
1578
1579         ieee80211_tx_skb(sdata, skb);
1580 }
1581
1582 static
1583 void ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data *sdata,
1584                                     struct ieee80211_mgmt *mgmt, size_t len,
1585                                     struct ieee80211_rx_status *rx_status)
1586 {
1587         size_t baselen;
1588         struct ieee802_11_elems *elems;
1589
1590         BUILD_BUG_ON(offsetof(typeof(mgmt->u.probe_resp), variable) !=
1591                      offsetof(typeof(mgmt->u.beacon), variable));
1592
1593         /*
1594          * either beacon or probe_resp but the variable field is at the
1595          * same offset
1596          */
1597         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1598         if (baselen > len)
1599                 return;
1600
1601         elems = ieee802_11_parse_elems(mgmt->u.probe_resp.variable,
1602                                        len - baselen, false, NULL);
1603
1604         if (elems) {
1605                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, elems);
1606                 kfree(elems);
1607         }
1608 }
1609
1610 void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1611                                    struct sk_buff *skb)
1612 {
1613         struct ieee80211_rx_status *rx_status;
1614         struct ieee80211_mgmt *mgmt;
1615         u16 fc;
1616         struct ieee802_11_elems *elems;
1617         int ies_len;
1618
1619         rx_status = IEEE80211_SKB_RXCB(skb);
1620         mgmt = (struct ieee80211_mgmt *) skb->data;
1621         fc = le16_to_cpu(mgmt->frame_control);
1622
1623         sdata_lock(sdata);
1624
1625         if (!sdata->u.ibss.ssid_len)
1626                 goto mgmt_out; /* not ready to merge yet */
1627
1628         switch (fc & IEEE80211_FCTL_STYPE) {
1629         case IEEE80211_STYPE_PROBE_REQ:
1630                 ieee80211_rx_mgmt_probe_req(sdata, skb);
1631                 break;
1632         case IEEE80211_STYPE_PROBE_RESP:
1633         case IEEE80211_STYPE_BEACON:
1634                 ieee80211_rx_mgmt_probe_beacon(sdata, mgmt, skb->len,
1635                                                rx_status);
1636                 break;
1637         case IEEE80211_STYPE_AUTH:
1638                 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len);
1639                 break;
1640         case IEEE80211_STYPE_DEAUTH:
1641                 ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len);
1642                 break;
1643         case IEEE80211_STYPE_ACTION:
1644                 switch (mgmt->u.action.category) {
1645                 case WLAN_CATEGORY_SPECTRUM_MGMT:
1646                         ies_len = skb->len -
1647                                   offsetof(struct ieee80211_mgmt,
1648                                            u.action.u.chan_switch.variable);
1649
1650                         if (ies_len < 0)
1651                                 break;
1652
1653                         elems = ieee802_11_parse_elems(
1654                                 mgmt->u.action.u.chan_switch.variable,
1655                                 ies_len, true, NULL);
1656
1657                         if (elems && !elems->parse_error)
1658                                 ieee80211_rx_mgmt_spectrum_mgmt(sdata, mgmt,
1659                                                                 skb->len,
1660                                                                 rx_status,
1661                                                                 elems);
1662                         kfree(elems);
1663                         break;
1664                 }
1665         }
1666
1667  mgmt_out:
1668         sdata_unlock(sdata);
1669 }
1670
1671 void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata)
1672 {
1673         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1674         struct sta_info *sta;
1675
1676         sdata_lock(sdata);
1677
1678         /*
1679          * Work could be scheduled after scan or similar
1680          * when we aren't even joined (or trying) with a
1681          * network.
1682          */
1683         if (!ifibss->ssid_len)
1684                 goto out;
1685
1686         spin_lock_bh(&ifibss->incomplete_lock);
1687         while (!list_empty(&ifibss->incomplete_stations)) {
1688                 sta = list_first_entry(&ifibss->incomplete_stations,
1689                                        struct sta_info, list);
1690                 list_del(&sta->list);
1691                 spin_unlock_bh(&ifibss->incomplete_lock);
1692
1693                 ieee80211_ibss_finish_sta(sta);
1694                 rcu_read_unlock();
1695                 spin_lock_bh(&ifibss->incomplete_lock);
1696         }
1697         spin_unlock_bh(&ifibss->incomplete_lock);
1698
1699         switch (ifibss->state) {
1700         case IEEE80211_IBSS_MLME_SEARCH:
1701                 ieee80211_sta_find_ibss(sdata);
1702                 break;
1703         case IEEE80211_IBSS_MLME_JOINED:
1704                 ieee80211_sta_merge_ibss(sdata);
1705                 break;
1706         default:
1707                 WARN_ON(1);
1708                 break;
1709         }
1710
1711  out:
1712         sdata_unlock(sdata);
1713 }
1714
1715 static void ieee80211_ibss_timer(struct timer_list *t)
1716 {
1717         struct ieee80211_sub_if_data *sdata =
1718                 from_timer(sdata, t, u.ibss.timer);
1719
1720         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1721 }
1722
1723 void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata)
1724 {
1725         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1726
1727         timer_setup(&ifibss->timer, ieee80211_ibss_timer, 0);
1728         INIT_LIST_HEAD(&ifibss->incomplete_stations);
1729         spin_lock_init(&ifibss->incomplete_lock);
1730         INIT_WORK(&ifibss->csa_connection_drop_work,
1731                   ieee80211_csa_connection_drop_work);
1732 }
1733
1734 /* scan finished notification */
1735 void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local)
1736 {
1737         struct ieee80211_sub_if_data *sdata;
1738
1739         mutex_lock(&local->iflist_mtx);
1740         list_for_each_entry(sdata, &local->interfaces, list) {
1741                 if (!ieee80211_sdata_running(sdata))
1742                         continue;
1743                 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
1744                         continue;
1745                 sdata->u.ibss.last_scan_completed = jiffies;
1746         }
1747         mutex_unlock(&local->iflist_mtx);
1748 }
1749
1750 int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
1751                         struct cfg80211_ibss_params *params)
1752 {
1753         u32 changed = 0;
1754         u32 rate_flags;
1755         struct ieee80211_supported_band *sband;
1756         enum ieee80211_chanctx_mode chanmode;
1757         struct ieee80211_local *local = sdata->local;
1758         int radar_detect_width = 0;
1759         int i;
1760         int ret;
1761
1762         if (params->chandef.chan->freq_offset) {
1763                 /* this may work, but is untested */
1764                 return -EOPNOTSUPP;
1765         }
1766
1767         ret = cfg80211_chandef_dfs_required(local->hw.wiphy,
1768                                             &params->chandef,
1769                                             sdata->wdev.iftype);
1770         if (ret < 0)
1771                 return ret;
1772
1773         if (ret > 0) {
1774                 if (!params->userspace_handles_dfs)
1775                         return -EINVAL;
1776                 radar_detect_width = BIT(params->chandef.width);
1777         }
1778
1779         chanmode = (params->channel_fixed && !ret) ?
1780                 IEEE80211_CHANCTX_SHARED : IEEE80211_CHANCTX_EXCLUSIVE;
1781
1782         mutex_lock(&local->chanctx_mtx);
1783         ret = ieee80211_check_combinations(sdata, &params->chandef, chanmode,
1784                                            radar_detect_width);
1785         mutex_unlock(&local->chanctx_mtx);
1786         if (ret < 0)
1787                 return ret;
1788
1789         if (params->bssid) {
1790                 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN);
1791                 sdata->u.ibss.fixed_bssid = true;
1792         } else
1793                 sdata->u.ibss.fixed_bssid = false;
1794
1795         sdata->u.ibss.privacy = params->privacy;
1796         sdata->u.ibss.control_port = params->control_port;
1797         sdata->u.ibss.userspace_handles_dfs = params->userspace_handles_dfs;
1798         sdata->u.ibss.basic_rates = params->basic_rates;
1799         sdata->u.ibss.last_scan_completed = jiffies;
1800
1801         /* fix basic_rates if channel does not support these rates */
1802         rate_flags = ieee80211_chandef_rate_flags(&params->chandef);
1803         sband = local->hw.wiphy->bands[params->chandef.chan->band];
1804         for (i = 0; i < sband->n_bitrates; i++) {
1805                 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
1806                         sdata->u.ibss.basic_rates &= ~BIT(i);
1807         }
1808         memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate,
1809                sizeof(params->mcast_rate));
1810
1811         sdata->vif.bss_conf.beacon_int = params->beacon_interval;
1812
1813         sdata->u.ibss.chandef = params->chandef;
1814         sdata->u.ibss.fixed_channel = params->channel_fixed;
1815
1816         if (params->ie) {
1817                 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len,
1818                                            GFP_KERNEL);
1819                 if (sdata->u.ibss.ie)
1820                         sdata->u.ibss.ie_len = params->ie_len;
1821         }
1822
1823         sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
1824         sdata->u.ibss.ibss_join_req = jiffies;
1825
1826         memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len);
1827         sdata->u.ibss.ssid_len = params->ssid_len;
1828
1829         memcpy(&sdata->u.ibss.ht_capa, &params->ht_capa,
1830                sizeof(sdata->u.ibss.ht_capa));
1831         memcpy(&sdata->u.ibss.ht_capa_mask, &params->ht_capa_mask,
1832                sizeof(sdata->u.ibss.ht_capa_mask));
1833
1834         /*
1835          * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is
1836          * reserved, but an HT STA shall protect HT transmissions as though
1837          * the HT Protection field were set to non-HT mixed mode.
1838          *
1839          * In an IBSS, the RIFS Mode field of the HT Operation element is
1840          * also reserved, but an HT STA shall operate as though this field
1841          * were set to 1.
1842          */
1843
1844         sdata->vif.bss_conf.ht_operation_mode |=
1845                   IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED
1846                 | IEEE80211_HT_PARAM_RIFS_MODE;
1847
1848         changed |= BSS_CHANGED_HT | BSS_CHANGED_MCAST_RATE;
1849         ieee80211_link_info_change_notify(sdata, &sdata->deflink, changed);
1850
1851         sdata->deflink.smps_mode = IEEE80211_SMPS_OFF;
1852         sdata->deflink.needed_rx_chains = local->rx_chains;
1853         sdata->control_port_over_nl80211 = params->control_port_over_nl80211;
1854
1855         ieee80211_queue_work(&local->hw, &sdata->work);
1856
1857         return 0;
1858 }
1859
1860 int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata)
1861 {
1862         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1863
1864         ieee80211_ibss_disconnect(sdata);
1865         ifibss->ssid_len = 0;
1866         eth_zero_addr(ifibss->bssid);
1867
1868         /* remove beacon */
1869         kfree(sdata->u.ibss.ie);
1870         sdata->u.ibss.ie = NULL;
1871         sdata->u.ibss.ie_len = 0;
1872
1873         /* on the next join, re-program HT parameters */
1874         memset(&ifibss->ht_capa, 0, sizeof(ifibss->ht_capa));
1875         memset(&ifibss->ht_capa_mask, 0, sizeof(ifibss->ht_capa_mask));
1876
1877         synchronize_rcu();
1878
1879         skb_queue_purge(&sdata->skb_queue);
1880
1881         del_timer_sync(&sdata->u.ibss.timer);
1882
1883         return 0;
1884 }