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         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         u64 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                               u64 *changed)
 483 {
 484         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 485         struct beacon_data *presp, *old_presp;
 486         struct cfg80211_bss *cbss;
 487         const struct cfg80211_bss_ies *ies;
 488         u16 capability = WLAN_CAPABILITY_IBSS;
 489         u64 tsf;
 490
 491         sdata_assert_lock(sdata);
 492
 493         if (ifibss->privacy)
 494                 capability |= WLAN_CAPABILITY_PRIVACY;
 495
 496         cbss = cfg80211_get_bss(sdata->local->hw.wiphy, ifibss->chandef.chan,
 497                                 ifibss->bssid, ifibss->ssid,
 498                                 ifibss->ssid_len, IEEE80211_BSS_TYPE_IBSS,
 499                                 IEEE80211_PRIVACY(ifibss->privacy));
 500
 501         if (WARN_ON(!cbss))
 502                 return -EINVAL;
 503
 504         rcu_read_lock();
 505         ies = rcu_dereference(cbss->ies);
 506         tsf = ies->tsf;
 507         rcu_read_unlock();
 508         cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
 509
 510         old_presp = sdata_dereference(ifibss->presp, sdata);
 511
 512         presp = ieee80211_ibss_build_presp(sdata,
 513                                            sdata->vif.bss_conf.beacon_int,
 514                                            sdata->vif.bss_conf.basic_rates,
 515                                            capability, tsf, &ifibss->chandef,
 516                                            NULL, csa_settings);
 517         if (!presp)
 518                 return -ENOMEM;
 519
 520         rcu_assign_pointer(ifibss->presp, presp);
 521         if (old_presp)
 522                 kfree_rcu(old_presp, rcu_head);
 523
 524         *changed |= BSS_CHANGED_BEACON;
 525         return 0;
 526 }
 527
 528 int ieee80211_ibss_finish_csa(struct ieee80211_sub_if_data *sdata, u64 *changed)
 529 {
 530         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 531         struct cfg80211_bss *cbss;
 532
 533         sdata_assert_lock(sdata);
 534
 535         /* When not connected/joined, sending CSA doesn't make sense. */
 536         if (ifibss->state != IEEE80211_IBSS_MLME_JOINED)
 537                 return -ENOLINK;
 538
 539         /* update cfg80211 bss information with the new channel */
 540         if (!is_zero_ether_addr(ifibss->bssid)) {
 541                 cbss = cfg80211_get_bss(sdata->local->hw.wiphy,
 542                                         ifibss->chandef.chan,
 543                                         ifibss->bssid, ifibss->ssid,
 544                                         ifibss->ssid_len,
 545                                         IEEE80211_BSS_TYPE_IBSS,
 546                                         IEEE80211_PRIVACY(ifibss->privacy));
 547                 /* XXX: should not really modify cfg80211 data */
 548                 if (cbss) {
 549                         cbss->channel = sdata->deflink.csa_chandef.chan;
 550                         cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
 551                 }
 552         }
 553
 554         ifibss->chandef = sdata->deflink.csa_chandef;
 555
 556         /* generate the beacon */
 557         return ieee80211_ibss_csa_beacon(sdata, NULL, changed);
 558 }
 559
 560 void ieee80211_ibss_stop(struct ieee80211_sub_if_data *sdata)
 561 {
 562         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 563
 564         wiphy_work_cancel(sdata->local->hw.wiphy,
 565                           &ifibss->csa_connection_drop_work);
 566 }
 567
 568 static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta)
 569         __acquires(RCU)
 570 {
 571         struct ieee80211_sub_if_data *sdata = sta->sdata;
 572         u8 addr[ETH_ALEN];
 573
 574         memcpy(addr, sta->sta.addr, ETH_ALEN);
 575
 576         ibss_dbg(sdata, "Adding new IBSS station %pM\n", addr);
 577
 578         sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
 579         sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
 580         /* authorize the station only if the network is not RSN protected. If
 581          * not wait for the userspace to authorize it */
 582         if (!sta->sdata->u.ibss.control_port)
 583                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
 584
 585         rate_control_rate_init(sta);
 586
 587         /* If it fails, maybe we raced another insertion? */
 588         if (sta_info_insert_rcu(sta))
 589                 return sta_info_get(sdata, addr);
 590         return sta;
 591 }
 592
 593 static struct sta_info *
 594 ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, const u8 *bssid,
 595                        const u8 *addr, u32 supp_rates)
 596         __acquires(RCU)
 597 {
 598         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 599         struct ieee80211_local *local = sdata->local;
 600         struct sta_info *sta;
 601         struct ieee80211_chanctx_conf *chanctx_conf;
 602         struct ieee80211_supported_band *sband;
 603         enum nl80211_bss_scan_width scan_width;
 604         int band;
 605
 606         /*
 607          * XXX: Consider removing the least recently used entry and
 608          *      allow new one to be added.
 609          */
 610         if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
 611                 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
 612                                     sdata->name, addr);
 613                 rcu_read_lock();
 614                 return NULL;
 615         }
 616
 617         if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) {
 618                 rcu_read_lock();
 619                 return NULL;
 620         }
 621
 622         if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) {
 623                 rcu_read_lock();
 624                 return NULL;
 625         }
 626
 627         rcu_read_lock();
 628         chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
 629         if (WARN_ON_ONCE(!chanctx_conf))
 630                 return NULL;
 631         band = chanctx_conf->def.chan->band;
 632         scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
 633         rcu_read_unlock();
 634
 635         sta = sta_info_alloc(sdata, addr, GFP_KERNEL);
 636         if (!sta) {
 637                 rcu_read_lock();
 638                 return NULL;
 639         }
 640
 641         /* make sure mandatory rates are always added */
 642         sband = local->hw.wiphy->bands[band];
 643         sta->sta.deflink.supp_rates[band] = supp_rates |
 644                         ieee80211_mandatory_rates(sband, scan_width);
 645
 646         return ieee80211_ibss_finish_sta(sta);
 647 }
 648
 649 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
 650 {
 651         struct ieee80211_local *local = sdata->local;
 652         int active = 0;
 653         struct sta_info *sta;
 654
 655         sdata_assert_lock(sdata);
 656
 657         rcu_read_lock();
 658
 659         list_for_each_entry_rcu(sta, &local->sta_list, list) {
 660                 unsigned long last_active = ieee80211_sta_last_active(sta);
 661
 662                 if (sta->sdata == sdata &&
 663                     time_is_after_jiffies(last_active +
 664                                           IEEE80211_IBSS_MERGE_INTERVAL)) {
 665                         active++;
 666                         break;
 667                 }
 668         }
 669
 670         rcu_read_unlock();
 671
 672         return active;
 673 }
 674
 675 static void ieee80211_ibss_disconnect(struct ieee80211_sub_if_data *sdata)
 676 {
 677         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 678         struct ieee80211_local *local = sdata->local;
 679         struct cfg80211_bss *cbss;
 680         struct beacon_data *presp;
 681         struct sta_info *sta;
 682
 683         if (!is_zero_ether_addr(ifibss->bssid)) {
 684                 cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->chandef.chan,
 685                                         ifibss->bssid, ifibss->ssid,
 686                                         ifibss->ssid_len,
 687                                         IEEE80211_BSS_TYPE_IBSS,
 688                                         IEEE80211_PRIVACY(ifibss->privacy));
 689
 690                 if (cbss) {
 691                         cfg80211_unlink_bss(local->hw.wiphy, cbss);
 692                         cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
 693                 }
 694         }
 695
 696         ifibss->state = IEEE80211_IBSS_MLME_SEARCH;
 697
 698         sta_info_flush(sdata);
 699
 700         spin_lock_bh(&ifibss->incomplete_lock);
 701         while (!list_empty(&ifibss->incomplete_stations)) {
 702                 sta = list_first_entry(&ifibss->incomplete_stations,
 703                                        struct sta_info, list);
 704                 list_del(&sta->list);
 705                 spin_unlock_bh(&ifibss->incomplete_lock);
 706
 707                 sta_info_free(local, sta);
 708                 spin_lock_bh(&ifibss->incomplete_lock);
 709         }
 710         spin_unlock_bh(&ifibss->incomplete_lock);
 711
 712         netif_carrier_off(sdata->dev);
 713
 714         sdata->vif.cfg.ibss_joined = false;
 715         sdata->vif.cfg.ibss_creator = false;
 716         sdata->vif.bss_conf.enable_beacon = false;
 717         sdata->vif.cfg.ssid_len = 0;
 718
 719         /* remove beacon */
 720         presp = sdata_dereference(ifibss->presp, sdata);
 721         RCU_INIT_POINTER(sdata->u.ibss.presp, NULL);
 722         if (presp)
 723                 kfree_rcu(presp, rcu_head);
 724
 725         clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state);
 726         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED |
 727                                                 BSS_CHANGED_IBSS);
 728         drv_leave_ibss(local, sdata);
 729         mutex_lock(&local->mtx);
 730         ieee80211_link_release_channel(&sdata->deflink);
 731         mutex_unlock(&local->mtx);
 732 }
 733
 734 static void ieee80211_csa_connection_drop_work(struct wiphy *wiphy,
 735                                                struct wiphy_work *work)
 736 {
 737         struct ieee80211_sub_if_data *sdata =
 738                 container_of(work, struct ieee80211_sub_if_data,
 739                              u.ibss.csa_connection_drop_work);
 740
 741         sdata_lock(sdata);
 742
 743         ieee80211_ibss_disconnect(sdata);
 744         synchronize_rcu();
 745         skb_queue_purge(&sdata->skb_queue);
 746
 747         /* trigger a scan to find another IBSS network to join */
 748         wiphy_work_queue(sdata->local->hw.wiphy, &sdata->work);
 749
 750         sdata_unlock(sdata);
 751 }
 752
 753 static void ieee80211_ibss_csa_mark_radar(struct ieee80211_sub_if_data *sdata)
 754 {
 755         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 756         int err;
 757
 758         /* if the current channel is a DFS channel, mark the channel as
 759          * unavailable.
 760          */
 761         err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
 762                                             &ifibss->chandef,
 763                                             NL80211_IFTYPE_ADHOC);
 764         if (err > 0)
 765                 cfg80211_radar_event(sdata->local->hw.wiphy, &ifibss->chandef,
 766                                      GFP_ATOMIC);
 767 }
 768
 769 static bool
 770 ieee80211_ibss_process_chanswitch(struct ieee80211_sub_if_data *sdata,
 771                                   struct ieee802_11_elems *elems,
 772                                   bool beacon)
 773 {
 774         struct cfg80211_csa_settings params;
 775         struct ieee80211_csa_ie csa_ie;
 776         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 777         enum nl80211_channel_type ch_type;
 778         int err;
 779         ieee80211_conn_flags_t conn_flags;
 780         u32 vht_cap_info = 0;
 781
 782         sdata_assert_lock(sdata);
 783
 784         conn_flags = IEEE80211_CONN_DISABLE_VHT;
 785
 786         switch (ifibss->chandef.width) {
 787         case NL80211_CHAN_WIDTH_5:
 788         case NL80211_CHAN_WIDTH_10:
 789         case NL80211_CHAN_WIDTH_20_NOHT:
 790                 conn_flags |= IEEE80211_CONN_DISABLE_HT;
 791                 fallthrough;
 792         case NL80211_CHAN_WIDTH_20:
 793                 conn_flags |= IEEE80211_CONN_DISABLE_40MHZ;
 794                 break;
 795         default:
 796                 break;
 797         }
 798
 799         if (elems->vht_cap_elem)
 800                 vht_cap_info = le32_to_cpu(elems->vht_cap_elem->vht_cap_info);
 801
 802         memset(&params, 0, sizeof(params));
 803         err = ieee80211_parse_ch_switch_ie(sdata, elems,
 804                                            ifibss->chandef.chan->band,
 805                                            vht_cap_info,
 806                                            conn_flags, ifibss->bssid, &csa_ie);
 807         /* can't switch to destination channel, fail */
 808         if (err < 0)
 809                 goto disconnect;
 810
 811         /* did not contain a CSA */
 812         if (err)
 813                 return false;
 814
 815         /* channel switch is not supported, disconnect */
 816         if (!(sdata->local->hw.wiphy->flags & WIPHY_FLAG_HAS_CHANNEL_SWITCH))
 817                 goto disconnect;
 818
 819         params.count = csa_ie.count;
 820         params.chandef = csa_ie.chandef;
 821
 822         switch (ifibss->chandef.width) {
 823         case NL80211_CHAN_WIDTH_20_NOHT:
 824         case NL80211_CHAN_WIDTH_20:
 825         case NL80211_CHAN_WIDTH_40:
 826                 /* keep our current HT mode (HT20/HT40+/HT40-), even if
 827                  * another mode  has been announced. The mode is not adopted
 828                  * within the beacon while doing CSA and we should therefore
 829                  * keep the mode which we announce.
 830                  */
 831                 ch_type = cfg80211_get_chandef_type(&ifibss->chandef);
 832                 cfg80211_chandef_create(&params.chandef, params.chandef.chan,
 833                                         ch_type);
 834                 break;
 835         case NL80211_CHAN_WIDTH_5:
 836         case NL80211_CHAN_WIDTH_10:
 837                 if (params.chandef.width != ifibss->chandef.width) {
 838                         sdata_info(sdata,
 839                                    "IBSS %pM received channel switch from incompatible channel width (%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                 break;
 848         default:
 849                 /* should not happen, conn_flags should prevent VHT modes. */
 850                 WARN_ON(1);
 851                 goto disconnect;
 852         }
 853
 854         if (!cfg80211_reg_can_beacon(sdata->local->hw.wiphy, &params.chandef,
 855                                      NL80211_IFTYPE_ADHOC)) {
 856                 sdata_info(sdata,
 857                            "IBSS %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
 858                            ifibss->bssid,
 859                            params.chandef.chan->center_freq,
 860                            params.chandef.width,
 861                            params.chandef.center_freq1,
 862                            params.chandef.center_freq2);
 863                 goto disconnect;
 864         }
 865
 866         err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
 867                                             &params.chandef,
 868                                             NL80211_IFTYPE_ADHOC);
 869         if (err < 0)
 870                 goto disconnect;
 871         if (err > 0 && !ifibss->userspace_handles_dfs) {
 872                 /* IBSS-DFS only allowed with a control program */
 873                 goto disconnect;
 874         }
 875
 876         params.radar_required = err;
 877
 878         if (cfg80211_chandef_identical(&params.chandef,
 879                                        &sdata->vif.bss_conf.chandef)) {
 880                 ibss_dbg(sdata,
 881                          "received csa with an identical chandef, ignoring\n");
 882                 return true;
 883         }
 884
 885         /* all checks done, now perform the channel switch. */
 886         ibss_dbg(sdata,
 887                  "received channel switch announcement to go to channel %d MHz\n",
 888                  params.chandef.chan->center_freq);
 889
 890         params.block_tx = !!csa_ie.mode;
 891
 892         if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev,
 893                                      &params))
 894                 goto disconnect;
 895
 896         ieee80211_ibss_csa_mark_radar(sdata);
 897
 898         return true;
 899 disconnect:
 900         ibss_dbg(sdata, "Can't handle channel switch, disconnect\n");
 901         wiphy_work_queue(sdata->local->hw.wiphy,
 902                          &ifibss->csa_connection_drop_work);
 903
 904         ieee80211_ibss_csa_mark_radar(sdata);
 905
 906         return true;
 907 }
 908
 909 static void
 910 ieee80211_rx_mgmt_spectrum_mgmt(struct ieee80211_sub_if_data *sdata,
 911                                 struct ieee80211_mgmt *mgmt, size_t len,
 912                                 struct ieee80211_rx_status *rx_status,
 913                                 struct ieee802_11_elems *elems)
 914 {
 915         int required_len;
 916
 917         if (len < IEEE80211_MIN_ACTION_SIZE + 1)
 918                 return;
 919
 920         /* CSA is the only action we handle for now */
 921         if (mgmt->u.action.u.measurement.action_code !=
 922             WLAN_ACTION_SPCT_CHL_SWITCH)
 923                 return;
 924
 925         required_len = IEEE80211_MIN_ACTION_SIZE +
 926                        sizeof(mgmt->u.action.u.chan_switch);
 927         if (len < required_len)
 928                 return;
 929
 930         if (!sdata->vif.bss_conf.csa_active)
 931                 ieee80211_ibss_process_chanswitch(sdata, elems, false);
 932 }
 933
 934 static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data *sdata,
 935                                           struct ieee80211_mgmt *mgmt,
 936                                           size_t len)
 937 {
 938         u16 reason = le16_to_cpu(mgmt->u.deauth.reason_code);
 939
 940         if (len < IEEE80211_DEAUTH_FRAME_LEN)
 941                 return;
 942
 943         ibss_dbg(sdata, "RX DeAuth SA=%pM DA=%pM\n", mgmt->sa, mgmt->da);
 944         ibss_dbg(sdata, "\tBSSID=%pM (reason: %d)\n", mgmt->bssid, reason);
 945         sta_info_destroy_addr(sdata, mgmt->sa);
 946 }
 947
 948 static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata,
 949                                         struct ieee80211_mgmt *mgmt,
 950                                         size_t len)
 951 {
 952         u16 auth_alg, auth_transaction;
 953
 954         sdata_assert_lock(sdata);
 955
 956         if (len < 24 + 6)
 957                 return;
 958
 959         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
 960         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
 961
 962         ibss_dbg(sdata, "RX Auth SA=%pM DA=%pM\n", mgmt->sa, mgmt->da);
 963         ibss_dbg(sdata, "\tBSSID=%pM (auth_transaction=%d)\n",
 964                  mgmt->bssid, auth_transaction);
 965
 966         if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
 967                 return;
 968
 969         /*
 970          * IEEE 802.11 standard does not require authentication in IBSS
 971          * networks and most implementations do not seem to use it.
 972          * However, try to reply to authentication attempts if someone
 973          * has actually implemented this.
 974          */
 975         ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, 0, NULL, 0,
 976                             mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0, 0);
 977 }
 978
 979 static void ieee80211_update_sta_info(struct ieee80211_sub_if_data *sdata,
 980                                       struct ieee80211_mgmt *mgmt, size_t len,
 981                                       struct ieee80211_rx_status *rx_status,
 982                                       struct ieee802_11_elems *elems,
 983                                       struct ieee80211_channel *channel)
 984 {
 985         struct sta_info *sta;
 986         enum nl80211_band band = rx_status->band;
 987         enum nl80211_bss_scan_width scan_width;
 988         struct ieee80211_local *local = sdata->local;
 989         struct ieee80211_supported_band *sband;
 990         bool rates_updated = false;
 991         u32 supp_rates = 0;
 992
 993         if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
 994                 return;
 995
 996         if (!ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid))
 997                 return;
 998
 999         sband = local->hw.wiphy->bands[band];
1000         if (WARN_ON(!sband))
1001                 return;
1002
1003         rcu_read_lock();
1004         sta = sta_info_get(sdata, mgmt->sa);
1005
1006         if (elems->supp_rates) {
1007                 supp_rates = ieee80211_sta_get_rates(sdata, elems,
1008                                                      band, NULL);
1009                 if (sta) {
1010                         u32 prev_rates;
1011
1012                         prev_rates = sta->sta.deflink.supp_rates[band];
1013                         /* make sure mandatory rates are always added */
1014                         scan_width = NL80211_BSS_CHAN_WIDTH_20;
1015                         if (rx_status->bw == RATE_INFO_BW_5)
1016                                 scan_width = NL80211_BSS_CHAN_WIDTH_5;
1017                         else if (rx_status->bw == RATE_INFO_BW_10)
1018                                 scan_width = NL80211_BSS_CHAN_WIDTH_10;
1019
1020                         sta->sta.deflink.supp_rates[band] = supp_rates |
1021                                 ieee80211_mandatory_rates(sband, scan_width);
1022                         if (sta->sta.deflink.supp_rates[band] != prev_rates) {
1023                                 ibss_dbg(sdata,
1024                                          "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n",
1025                                          sta->sta.addr, prev_rates,
1026                                          sta->sta.deflink.supp_rates[band]);
1027                                 rates_updated = true;
1028                         }
1029                 } else {
1030                         rcu_read_unlock();
1031                         sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid,
1032                                                      mgmt->sa, supp_rates);
1033                 }
1034         }
1035
1036         if (sta && !sta->sta.wme &&
1037             (elems->wmm_info || elems->s1g_capab) &&
1038             local->hw.queues >= IEEE80211_NUM_ACS) {
1039                 sta->sta.wme = true;
1040                 ieee80211_check_fast_xmit(sta);
1041         }
1042
1043         if (sta && elems->ht_operation && elems->ht_cap_elem &&
1044             sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20_NOHT &&
1045             sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_5 &&
1046             sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_10) {
1047                 /* we both use HT */
1048                 struct ieee80211_ht_cap htcap_ie;
1049                 struct cfg80211_chan_def chandef;
1050                 enum ieee80211_sta_rx_bandwidth bw = sta->sta.deflink.bandwidth;
1051
1052                 cfg80211_chandef_create(&chandef, channel, NL80211_CHAN_NO_HT);
1053                 ieee80211_chandef_ht_oper(elems->ht_operation, &chandef);
1054
1055                 memcpy(&htcap_ie, elems->ht_cap_elem, sizeof(htcap_ie));
1056                 rates_updated |= ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
1057                                                                    &htcap_ie,
1058                                                                    &sta->deflink);
1059
1060                 if (elems->vht_operation && elems->vht_cap_elem &&
1061                     sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20 &&
1062                     sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_40) {
1063                         /* we both use VHT */
1064                         struct ieee80211_vht_cap cap_ie;
1065                         struct ieee80211_sta_vht_cap cap = sta->sta.deflink.vht_cap;
1066                         u32 vht_cap_info =
1067                                 le32_to_cpu(elems->vht_cap_elem->vht_cap_info);
1068
1069                         ieee80211_chandef_vht_oper(&local->hw, vht_cap_info,
1070                                                    elems->vht_operation,
1071                                                    elems->ht_operation,
1072                                                    &chandef);
1073                         memcpy(&cap_ie, elems->vht_cap_elem, sizeof(cap_ie));
1074                         ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
1075                                                             &cap_ie,
1076                                                             &sta->deflink);
1077                         if (memcmp(&cap, &sta->sta.deflink.vht_cap, sizeof(cap)))
1078                                 rates_updated |= true;
1079                 }
1080
1081                 if (bw != sta->sta.deflink.bandwidth)
1082                         rates_updated |= true;
1083
1084                 if (!cfg80211_chandef_compatible(&sdata->u.ibss.chandef,
1085                                                  &chandef))
1086                         WARN_ON_ONCE(1);
1087         }
1088
1089         if (sta && rates_updated) {
1090                 u32 changed = IEEE80211_RC_SUPP_RATES_CHANGED;
1091                 u8 rx_nss = sta->sta.deflink.rx_nss;
1092
1093                 /* Force rx_nss recalculation */
1094                 sta->sta.deflink.rx_nss = 0;
1095                 rate_control_rate_init(sta);
1096                 if (sta->sta.deflink.rx_nss != rx_nss)
1097                         changed |= IEEE80211_RC_NSS_CHANGED;
1098
1099                 drv_sta_rc_update(local, sdata, &sta->sta, changed);
1100         }
1101
1102         rcu_read_unlock();
1103 }
1104
1105 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1106                                   struct ieee80211_mgmt *mgmt, size_t len,
1107                                   struct ieee80211_rx_status *rx_status,
1108                                   struct ieee802_11_elems *elems)
1109 {
1110         struct ieee80211_local *local = sdata->local;
1111         struct cfg80211_bss *cbss;
1112         struct ieee80211_bss *bss;
1113         struct ieee80211_channel *channel;
1114         u64 beacon_timestamp, rx_timestamp;
1115         u32 supp_rates = 0;
1116         enum nl80211_band band = rx_status->band;
1117
1118         channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
1119         if (!channel)
1120                 return;
1121
1122         ieee80211_update_sta_info(sdata, mgmt, len, rx_status, elems, channel);
1123
1124         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, channel);
1125         if (!bss)
1126                 return;
1127
1128         cbss = container_of((void *)bss, struct cfg80211_bss, priv);
1129
1130         /* same for beacon and probe response */
1131         beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp);
1132
1133         /* check if we need to merge IBSS */
1134
1135         /* not an IBSS */
1136         if (!(cbss->capability & WLAN_CAPABILITY_IBSS))
1137                 goto put_bss;
1138
1139         /* different channel */
1140         if (sdata->u.ibss.fixed_channel &&
1141             sdata->u.ibss.chandef.chan != cbss->channel)
1142                 goto put_bss;
1143
1144         /* different SSID */
1145         if (elems->ssid_len != sdata->u.ibss.ssid_len ||
1146             memcmp(elems->ssid, sdata->u.ibss.ssid,
1147                                 sdata->u.ibss.ssid_len))
1148                 goto put_bss;
1149
1150         /* process channel switch */
1151         if (sdata->vif.bss_conf.csa_active ||
1152             ieee80211_ibss_process_chanswitch(sdata, elems, true))
1153                 goto put_bss;
1154
1155         /* same BSSID */
1156         if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid))
1157                 goto put_bss;
1158
1159         /* we use a fixed BSSID */
1160         if (sdata->u.ibss.fixed_bssid)
1161                 goto put_bss;
1162
1163         if (ieee80211_have_rx_timestamp(rx_status)) {
1164                 /* time when timestamp field was received */
1165                 rx_timestamp =
1166                         ieee80211_calculate_rx_timestamp(local, rx_status,
1167                                                          len + FCS_LEN, 24);
1168         } else {
1169                 /*
1170                  * second best option: get current TSF
1171                  * (will return -1 if not supported)
1172                  */
1173                 rx_timestamp = drv_get_tsf(local, sdata);
1174         }
1175
1176         ibss_dbg(sdata, "RX beacon SA=%pM BSSID=%pM TSF=0x%llx\n",
1177                  mgmt->sa, mgmt->bssid,
1178                  (unsigned long long)rx_timestamp);
1179         ibss_dbg(sdata, "\tBCN=0x%llx diff=%lld @%lu\n",
1180                  (unsigned long long)beacon_timestamp,
1181                  (unsigned long long)(rx_timestamp - beacon_timestamp),
1182                  jiffies);
1183
1184         if (beacon_timestamp > rx_timestamp) {
1185                 ibss_dbg(sdata,
1186                          "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n",
1187                          mgmt->bssid);
1188                 ieee80211_sta_join_ibss(sdata, bss);
1189                 supp_rates = ieee80211_sta_get_rates(sdata, elems, band, NULL);
1190                 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa,
1191                                        supp_rates);
1192                 rcu_read_unlock();
1193         }
1194
1195  put_bss:
1196         ieee80211_rx_bss_put(local, bss);
1197 }
1198
1199 void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata,
1200                               const u8 *bssid, const u8 *addr,
1201                               u32 supp_rates)
1202 {
1203         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1204         struct ieee80211_local *local = sdata->local;
1205         struct sta_info *sta;
1206         struct ieee80211_chanctx_conf *chanctx_conf;
1207         struct ieee80211_supported_band *sband;
1208         enum nl80211_bss_scan_width scan_width;
1209         int band;
1210
1211         /*
1212          * XXX: Consider removing the least recently used entry and
1213          *      allow new one to be added.
1214          */
1215         if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
1216                 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
1217                                     sdata->name, addr);
1218                 return;
1219         }
1220
1221         if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH)
1222                 return;
1223
1224         if (!ether_addr_equal(bssid, sdata->u.ibss.bssid))
1225                 return;
1226
1227         rcu_read_lock();
1228         chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
1229         if (WARN_ON_ONCE(!chanctx_conf)) {
1230                 rcu_read_unlock();
1231                 return;
1232         }
1233         band = chanctx_conf->def.chan->band;
1234         scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
1235         rcu_read_unlock();
1236
1237         sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
1238         if (!sta)
1239                 return;
1240
1241         /* make sure mandatory rates are always added */
1242         sband = local->hw.wiphy->bands[band];
1243         sta->sta.deflink.supp_rates[band] = supp_rates |
1244                         ieee80211_mandatory_rates(sband, scan_width);
1245
1246         spin_lock(&ifibss->incomplete_lock);
1247         list_add(&sta->list, &ifibss->incomplete_stations);
1248         spin_unlock(&ifibss->incomplete_lock);
1249         wiphy_work_queue(local->hw.wiphy, &sdata->work);
1250 }
1251
1252 static void ieee80211_ibss_sta_expire(struct ieee80211_sub_if_data *sdata)
1253 {
1254         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1255         struct ieee80211_local *local = sdata->local;
1256         struct sta_info *sta, *tmp;
1257         unsigned long exp_time = IEEE80211_IBSS_INACTIVITY_LIMIT;
1258         unsigned long exp_rsn = IEEE80211_IBSS_RSN_INACTIVITY_LIMIT;
1259
1260         mutex_lock(&local->sta_mtx);
1261
1262         list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
1263                 unsigned long last_active = ieee80211_sta_last_active(sta);
1264
1265                 if (sdata != sta->sdata)
1266                         continue;
1267
1268                 if (time_is_before_jiffies(last_active + exp_time) ||
1269                     (time_is_before_jiffies(last_active + exp_rsn) &&
1270                      sta->sta_state != IEEE80211_STA_AUTHORIZED)) {
1271                         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
1272
1273                         sta_dbg(sta->sdata, "expiring inactive %sSTA %pM\n",
1274                                 sta->sta_state != IEEE80211_STA_AUTHORIZED ?
1275                                 "not authorized " : "", sta->sta.addr);
1276
1277                         ieee80211_send_deauth_disassoc(sdata, sta->sta.addr,
1278                                                        ifibss->bssid,
1279                                                        IEEE80211_STYPE_DEAUTH,
1280                                                        WLAN_REASON_DEAUTH_LEAVING,
1281                                                        true, frame_buf);
1282                         WARN_ON(__sta_info_destroy(sta));
1283                 }
1284         }
1285
1286         mutex_unlock(&local->sta_mtx);
1287 }
1288
1289 /*
1290  * This function is called with state == IEEE80211_IBSS_MLME_JOINED
1291  */
1292
1293 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
1294 {
1295         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1296         enum nl80211_bss_scan_width scan_width;
1297
1298         sdata_assert_lock(sdata);
1299
1300         mod_timer(&ifibss->timer,
1301                   round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
1302
1303         ieee80211_ibss_sta_expire(sdata);
1304
1305         if (time_before(jiffies, ifibss->last_scan_completed +
1306                        IEEE80211_IBSS_MERGE_INTERVAL))
1307                 return;
1308
1309         if (ieee80211_sta_active_ibss(sdata))
1310                 return;
1311
1312         if (ifibss->fixed_channel)
1313                 return;
1314
1315         sdata_info(sdata,
1316                    "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n");
1317
1318         scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
1319         ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len,
1320                                     NULL, 0, scan_width);
1321 }
1322
1323 static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
1324 {
1325         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1326         u8 bssid[ETH_ALEN];
1327         u16 capability;
1328         int i;
1329
1330         sdata_assert_lock(sdata);
1331
1332         if (ifibss->fixed_bssid) {
1333                 memcpy(bssid, ifibss->bssid, ETH_ALEN);
1334         } else {
1335                 /* Generate random, not broadcast, locally administered BSSID. Mix in
1336                  * own MAC address to make sure that devices that do not have proper
1337                  * random number generator get different BSSID. */
1338                 get_random_bytes(bssid, ETH_ALEN);
1339                 for (i = 0; i < ETH_ALEN; i++)
1340                         bssid[i] ^= sdata->vif.addr[i];
1341                 bssid[0] &= ~0x01;
1342                 bssid[0] |= 0x02;
1343         }
1344
1345         sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid);
1346
1347         capability = WLAN_CAPABILITY_IBSS;
1348
1349         if (ifibss->privacy)
1350                 capability |= WLAN_CAPABILITY_PRIVACY;
1351
1352         __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int,
1353                                   &ifibss->chandef, ifibss->basic_rates,
1354                                   capability, 0, true);
1355 }
1356
1357 static unsigned int ibss_setup_channels(struct wiphy *wiphy,
1358                                         struct ieee80211_channel **channels,
1359                                         unsigned int channels_max,
1360                                         u32 center_freq, u32 width)
1361 {
1362         struct ieee80211_channel *chan = NULL;
1363         unsigned int n_chan = 0;
1364         u32 start_freq, end_freq, freq;
1365
1366         if (width <= 20) {
1367                 start_freq = center_freq;
1368                 end_freq = center_freq;
1369         } else {
1370                 start_freq = center_freq - width / 2 + 10;
1371                 end_freq = center_freq + width / 2 - 10;
1372         }
1373
1374         for (freq = start_freq; freq <= end_freq; freq += 20) {
1375                 chan = ieee80211_get_channel(wiphy, freq);
1376                 if (!chan)
1377                         continue;
1378                 if (n_chan >= channels_max)
1379                         return n_chan;
1380
1381                 channels[n_chan] = chan;
1382                 n_chan++;
1383         }
1384
1385         return n_chan;
1386 }
1387
1388 static unsigned int
1389 ieee80211_ibss_setup_scan_channels(struct wiphy *wiphy,
1390                                    const struct cfg80211_chan_def *chandef,
1391                                    struct ieee80211_channel **channels,
1392                                    unsigned int channels_max)
1393 {
1394         unsigned int n_chan = 0;
1395         u32 width, cf1, cf2 = 0;
1396
1397         switch (chandef->width) {
1398         case NL80211_CHAN_WIDTH_40:
1399                 width = 40;
1400                 break;
1401         case NL80211_CHAN_WIDTH_80P80:
1402                 cf2 = chandef->center_freq2;
1403                 fallthrough;
1404         case NL80211_CHAN_WIDTH_80:
1405                 width = 80;
1406                 break;
1407         case NL80211_CHAN_WIDTH_160:
1408                 width = 160;
1409                 break;
1410         default:
1411                 width = 20;
1412                 break;
1413         }
1414
1415         cf1 = chandef->center_freq1;
1416
1417         n_chan = ibss_setup_channels(wiphy, channels, channels_max, cf1, width);
1418
1419         if (cf2)
1420                 n_chan += ibss_setup_channels(wiphy, &channels[n_chan],
1421                                               channels_max - n_chan, cf2,
1422                                               width);
1423
1424         return n_chan;
1425 }
1426
1427 /*
1428  * This function is called with state == IEEE80211_IBSS_MLME_SEARCH
1429  */
1430
1431 static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
1432 {
1433         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1434         struct ieee80211_local *local = sdata->local;
1435         struct cfg80211_bss *cbss;
1436         struct ieee80211_channel *chan = NULL;
1437         const u8 *bssid = NULL;
1438         enum nl80211_bss_scan_width scan_width;
1439         int active_ibss;
1440
1441         sdata_assert_lock(sdata);
1442
1443         active_ibss = ieee80211_sta_active_ibss(sdata);
1444         ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss);
1445
1446         if (active_ibss)
1447                 return;
1448
1449         if (ifibss->fixed_bssid)
1450                 bssid = ifibss->bssid;
1451         if (ifibss->fixed_channel)
1452                 chan = ifibss->chandef.chan;
1453         if (!is_zero_ether_addr(ifibss->bssid))
1454                 bssid = ifibss->bssid;
1455         cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid,
1456                                 ifibss->ssid, ifibss->ssid_len,
1457                                 IEEE80211_BSS_TYPE_IBSS,
1458                                 IEEE80211_PRIVACY(ifibss->privacy));
1459
1460         if (cbss) {
1461                 struct ieee80211_bss *bss;
1462
1463                 bss = (void *)cbss->priv;
1464                 ibss_dbg(sdata,
1465                          "sta_find_ibss: selected %pM current %pM\n",
1466                          cbss->bssid, ifibss->bssid);
1467                 sdata_info(sdata,
1468                            "Selected IBSS BSSID %pM based on configured SSID\n",
1469                            cbss->bssid);
1470
1471                 ieee80211_sta_join_ibss(sdata, bss);
1472                 ieee80211_rx_bss_put(local, bss);
1473                 return;
1474         }
1475
1476         /* if a fixed bssid and a fixed freq have been provided create the IBSS
1477          * directly and do not waste time scanning
1478          */
1479         if (ifibss->fixed_bssid && ifibss->fixed_channel) {
1480                 sdata_info(sdata, "Created IBSS using preconfigured BSSID %pM\n",
1481                            bssid);
1482                 ieee80211_sta_create_ibss(sdata);
1483                 return;
1484         }
1485
1486
1487         ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n");
1488
1489         /* Selected IBSS not found in current scan results - try to scan */
1490         if (time_after(jiffies, ifibss->last_scan_completed +
1491                                         IEEE80211_SCAN_INTERVAL)) {
1492                 struct ieee80211_channel *channels[8];
1493                 unsigned int num;
1494
1495                 sdata_info(sdata, "Trigger new scan to find an IBSS to join\n");
1496
1497                 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
1498
1499                 if (ifibss->fixed_channel) {
1500                         num = ieee80211_ibss_setup_scan_channels(local->hw.wiphy,
1501                                                                  &ifibss->chandef,
1502                                                                  channels,
1503                                                                  ARRAY_SIZE(channels));
1504                         ieee80211_request_ibss_scan(sdata, ifibss->ssid,
1505                                                     ifibss->ssid_len, channels,
1506                                                     num, scan_width);
1507                 } else {
1508                         ieee80211_request_ibss_scan(sdata, ifibss->ssid,
1509                                                     ifibss->ssid_len, NULL,
1510                                                     0, scan_width);
1511                 }
1512         } else {
1513                 int interval = IEEE80211_SCAN_INTERVAL;
1514
1515                 if (time_after(jiffies, ifibss->ibss_join_req +
1516                                IEEE80211_IBSS_JOIN_TIMEOUT))
1517                         ieee80211_sta_create_ibss(sdata);
1518
1519                 mod_timer(&ifibss->timer,
1520                           round_jiffies(jiffies + interval));
1521         }
1522 }
1523
1524 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
1525                                         struct sk_buff *req)
1526 {
1527         struct ieee80211_mgmt *mgmt = (void *)req->data;
1528         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1529         struct ieee80211_local *local = sdata->local;
1530         int tx_last_beacon, len = req->len;
1531         struct sk_buff *skb;
1532         struct beacon_data *presp;
1533         u8 *pos, *end;
1534
1535         sdata_assert_lock(sdata);
1536
1537         presp = sdata_dereference(ifibss->presp, sdata);
1538
1539         if (ifibss->state != IEEE80211_IBSS_MLME_JOINED ||
1540             len < 24 + 2 || !presp)
1541                 return;
1542
1543         tx_last_beacon = drv_tx_last_beacon(local);
1544
1545         ibss_dbg(sdata, "RX ProbeReq SA=%pM DA=%pM\n", mgmt->sa, mgmt->da);
1546         ibss_dbg(sdata, "\tBSSID=%pM (tx_last_beacon=%d)\n",
1547                  mgmt->bssid, tx_last_beacon);
1548
1549         if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da))
1550                 return;
1551
1552         if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) &&
1553             !is_broadcast_ether_addr(mgmt->bssid))
1554                 return;
1555
1556         end = ((u8 *) mgmt) + len;
1557         pos = mgmt->u.probe_req.variable;
1558         if (pos[0] != WLAN_EID_SSID ||
1559             pos + 2 + pos[1] > end) {
1560                 ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n",
1561                          mgmt->sa);
1562                 return;
1563         }
1564         if (pos[1] != 0 &&
1565             (pos[1] != ifibss->ssid_len ||
1566              memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) {
1567                 /* Ignore ProbeReq for foreign SSID */
1568                 return;
1569         }
1570
1571         /* Reply with ProbeResp */
1572         skb = dev_alloc_skb(local->tx_headroom + presp->head_len);
1573         if (!skb)
1574                 return;
1575
1576         skb_reserve(skb, local->tx_headroom);
1577         skb_put_data(skb, presp->head, presp->head_len);
1578
1579         memcpy(((struct ieee80211_mgmt *) skb->data)->da, mgmt->sa, ETH_ALEN);
1580         ibss_dbg(sdata, "Sending ProbeResp to %pM\n", mgmt->sa);
1581         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1582
1583         /* avoid excessive retries for probe request to wildcard SSIDs */
1584         if (pos[1] == 0)
1585                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_NO_ACK;
1586
1587         ieee80211_tx_skb(sdata, skb);
1588 }
1589
1590 static
1591 void ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data *sdata,
1592                                     struct ieee80211_mgmt *mgmt, size_t len,
1593                                     struct ieee80211_rx_status *rx_status)
1594 {
1595         size_t baselen;
1596         struct ieee802_11_elems *elems;
1597
1598         BUILD_BUG_ON(offsetof(typeof(mgmt->u.probe_resp), variable) !=
1599                      offsetof(typeof(mgmt->u.beacon), variable));
1600
1601         /*
1602          * either beacon or probe_resp but the variable field is at the
1603          * same offset
1604          */
1605         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1606         if (baselen > len)
1607                 return;
1608
1609         elems = ieee802_11_parse_elems(mgmt->u.probe_resp.variable,
1610                                        len - baselen, false, NULL);
1611
1612         if (elems) {
1613                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, elems);
1614                 kfree(elems);
1615         }
1616 }
1617
1618 void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1619                                    struct sk_buff *skb)
1620 {
1621         struct ieee80211_rx_status *rx_status;
1622         struct ieee80211_mgmt *mgmt;
1623         u16 fc;
1624         struct ieee802_11_elems *elems;
1625         int ies_len;
1626
1627         rx_status = IEEE80211_SKB_RXCB(skb);
1628         mgmt = (struct ieee80211_mgmt *) skb->data;
1629         fc = le16_to_cpu(mgmt->frame_control);
1630
1631         sdata_lock(sdata);
1632
1633         if (!sdata->u.ibss.ssid_len)
1634                 goto mgmt_out; /* not ready to merge yet */
1635
1636         switch (fc & IEEE80211_FCTL_STYPE) {
1637         case IEEE80211_STYPE_PROBE_REQ:
1638                 ieee80211_rx_mgmt_probe_req(sdata, skb);
1639                 break;
1640         case IEEE80211_STYPE_PROBE_RESP:
1641         case IEEE80211_STYPE_BEACON:
1642                 ieee80211_rx_mgmt_probe_beacon(sdata, mgmt, skb->len,
1643                                                rx_status);
1644                 break;
1645         case IEEE80211_STYPE_AUTH:
1646                 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len);
1647                 break;
1648         case IEEE80211_STYPE_DEAUTH:
1649                 ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len);
1650                 break;
1651         case IEEE80211_STYPE_ACTION:
1652                 switch (mgmt->u.action.category) {
1653                 case WLAN_CATEGORY_SPECTRUM_MGMT:
1654                         ies_len = skb->len -
1655                                   offsetof(struct ieee80211_mgmt,
1656                                            u.action.u.chan_switch.variable);
1657
1658                         if (ies_len < 0)
1659                                 break;
1660
1661                         elems = ieee802_11_parse_elems(
1662                                 mgmt->u.action.u.chan_switch.variable,
1663                                 ies_len, true, NULL);
1664
1665                         if (elems && !elems->parse_error)
1666                                 ieee80211_rx_mgmt_spectrum_mgmt(sdata, mgmt,
1667                                                                 skb->len,
1668                                                                 rx_status,
1669                                                                 elems);
1670                         kfree(elems);
1671                         break;
1672                 }
1673         }
1674
1675  mgmt_out:
1676         sdata_unlock(sdata);
1677 }
1678
1679 void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata)
1680 {
1681         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1682         struct sta_info *sta;
1683
1684         sdata_lock(sdata);
1685
1686         /*
1687          * Work could be scheduled after scan or similar
1688          * when we aren't even joined (or trying) with a
1689          * network.
1690          */
1691         if (!ifibss->ssid_len)
1692                 goto out;
1693
1694         spin_lock_bh(&ifibss->incomplete_lock);
1695         while (!list_empty(&ifibss->incomplete_stations)) {
1696                 sta = list_first_entry(&ifibss->incomplete_stations,
1697                                        struct sta_info, list);
1698                 list_del(&sta->list);
1699                 spin_unlock_bh(&ifibss->incomplete_lock);
1700
1701                 ieee80211_ibss_finish_sta(sta);
1702                 rcu_read_unlock();
1703                 spin_lock_bh(&ifibss->incomplete_lock);
1704         }
1705         spin_unlock_bh(&ifibss->incomplete_lock);
1706
1707         switch (ifibss->state) {
1708         case IEEE80211_IBSS_MLME_SEARCH:
1709                 ieee80211_sta_find_ibss(sdata);
1710                 break;
1711         case IEEE80211_IBSS_MLME_JOINED:
1712                 ieee80211_sta_merge_ibss(sdata);
1713                 break;
1714         default:
1715                 WARN_ON(1);
1716                 break;
1717         }
1718
1719  out:
1720         sdata_unlock(sdata);
1721 }
1722
1723 static void ieee80211_ibss_timer(struct timer_list *t)
1724 {
1725         struct ieee80211_sub_if_data *sdata =
1726                 from_timer(sdata, t, u.ibss.timer);
1727
1728         wiphy_work_queue(sdata->local->hw.wiphy, &sdata->work);
1729 }
1730
1731 void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata)
1732 {
1733         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1734
1735         timer_setup(&ifibss->timer, ieee80211_ibss_timer, 0);
1736         INIT_LIST_HEAD(&ifibss->incomplete_stations);
1737         spin_lock_init(&ifibss->incomplete_lock);
1738         wiphy_work_init(&ifibss->csa_connection_drop_work,
1739                         ieee80211_csa_connection_drop_work);
1740 }
1741
1742 /* scan finished notification */
1743 void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local)
1744 {
1745         struct ieee80211_sub_if_data *sdata;
1746
1747         mutex_lock(&local->iflist_mtx);
1748         list_for_each_entry(sdata, &local->interfaces, list) {
1749                 if (!ieee80211_sdata_running(sdata))
1750                         continue;
1751                 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
1752                         continue;
1753                 sdata->u.ibss.last_scan_completed = jiffies;
1754         }
1755         mutex_unlock(&local->iflist_mtx);
1756 }
1757
1758 int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
1759                         struct cfg80211_ibss_params *params)
1760 {
1761         u64 changed = 0;
1762         u32 rate_flags;
1763         struct ieee80211_supported_band *sband;
1764         enum ieee80211_chanctx_mode chanmode;
1765         struct ieee80211_local *local = sdata->local;
1766         int radar_detect_width = 0;
1767         int i;
1768         int ret;
1769
1770         if (params->chandef.chan->freq_offset) {
1771                 /* this may work, but is untested */
1772                 return -EOPNOTSUPP;
1773         }
1774
1775         ret = cfg80211_chandef_dfs_required(local->hw.wiphy,
1776                                             &params->chandef,
1777                                             sdata->wdev.iftype);
1778         if (ret < 0)
1779                 return ret;
1780
1781         if (ret > 0) {
1782                 if (!params->userspace_handles_dfs)
1783                         return -EINVAL;
1784                 radar_detect_width = BIT(params->chandef.width);
1785         }
1786
1787         chanmode = (params->channel_fixed && !ret) ?
1788                 IEEE80211_CHANCTX_SHARED : IEEE80211_CHANCTX_EXCLUSIVE;
1789
1790         mutex_lock(&local->chanctx_mtx);
1791         ret = ieee80211_check_combinations(sdata, &params->chandef, chanmode,
1792                                            radar_detect_width);
1793         mutex_unlock(&local->chanctx_mtx);
1794         if (ret < 0)
1795                 return ret;
1796
1797         if (params->bssid) {
1798                 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN);
1799                 sdata->u.ibss.fixed_bssid = true;
1800         } else
1801                 sdata->u.ibss.fixed_bssid = false;
1802
1803         sdata->u.ibss.privacy = params->privacy;
1804         sdata->u.ibss.control_port = params->control_port;
1805         sdata->u.ibss.userspace_handles_dfs = params->userspace_handles_dfs;
1806         sdata->u.ibss.basic_rates = params->basic_rates;
1807         sdata->u.ibss.last_scan_completed = jiffies;
1808
1809         /* fix basic_rates if channel does not support these rates */
1810         rate_flags = ieee80211_chandef_rate_flags(&params->chandef);
1811         sband = local->hw.wiphy->bands[params->chandef.chan->band];
1812         for (i = 0; i < sband->n_bitrates; i++) {
1813                 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
1814                         sdata->u.ibss.basic_rates &= ~BIT(i);
1815         }
1816         memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate,
1817                sizeof(params->mcast_rate));
1818
1819         sdata->vif.bss_conf.beacon_int = params->beacon_interval;
1820
1821         sdata->u.ibss.chandef = params->chandef;
1822         sdata->u.ibss.fixed_channel = params->channel_fixed;
1823
1824         if (params->ie) {
1825                 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len,
1826                                            GFP_KERNEL);
1827                 if (sdata->u.ibss.ie)
1828                         sdata->u.ibss.ie_len = params->ie_len;
1829         }
1830
1831         sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
1832         sdata->u.ibss.ibss_join_req = jiffies;
1833
1834         memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len);
1835         sdata->u.ibss.ssid_len = params->ssid_len;
1836
1837         memcpy(&sdata->u.ibss.ht_capa, &params->ht_capa,
1838                sizeof(sdata->u.ibss.ht_capa));
1839         memcpy(&sdata->u.ibss.ht_capa_mask, &params->ht_capa_mask,
1840                sizeof(sdata->u.ibss.ht_capa_mask));
1841
1842         /*
1843          * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is
1844          * reserved, but an HT STA shall protect HT transmissions as though
1845          * the HT Protection field were set to non-HT mixed mode.
1846          *
1847          * In an IBSS, the RIFS Mode field of the HT Operation element is
1848          * also reserved, but an HT STA shall operate as though this field
1849          * were set to 1.
1850          */
1851
1852         sdata->vif.bss_conf.ht_operation_mode |=
1853                   IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED
1854                 | IEEE80211_HT_PARAM_RIFS_MODE;
1855
1856         changed |= BSS_CHANGED_HT | BSS_CHANGED_MCAST_RATE;
1857         ieee80211_link_info_change_notify(sdata, &sdata->deflink, changed);
1858
1859         sdata->deflink.smps_mode = IEEE80211_SMPS_OFF;
1860         sdata->deflink.needed_rx_chains = local->rx_chains;
1861         sdata->control_port_over_nl80211 = params->control_port_over_nl80211;
1862
1863         wiphy_work_queue(local->hw.wiphy, &sdata->work);
1864
1865         return 0;
1866 }
1867
1868 int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata)
1869 {
1870         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1871
1872         ieee80211_ibss_disconnect(sdata);
1873         ifibss->ssid_len = 0;
1874         eth_zero_addr(ifibss->bssid);
1875
1876         /* remove beacon */
1877         kfree(sdata->u.ibss.ie);
1878         sdata->u.ibss.ie = NULL;
1879         sdata->u.ibss.ie_len = 0;
1880
1881         /* on the next join, re-program HT parameters */
1882         memset(&ifibss->ht_capa, 0, sizeof(ifibss->ht_capa));
1883         memset(&ifibss->ht_capa_mask, 0, sizeof(ifibss->ht_capa_mask));
1884
1885         synchronize_rcu();
1886
1887         skb_queue_purge(&sdata->skb_queue);
1888
1889         del_timer_sync(&sdata->u.ibss.timer);
1890
1891         return 0;
1892 }