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         if (chan->band == NL80211_BAND_2GHZ && have_higher_than_11mbit)
 355                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
 356         else
 357                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
 358
 359         ieee80211_set_wmm_default(sdata, true, false);
 360
 361         sdata->vif.cfg.ibss_joined = true;
 362         sdata->vif.cfg.ibss_creator = creator;
 363
 364         err = drv_join_ibss(local, sdata);
 365         if (err) {
 366                 sdata->vif.cfg.ibss_joined = false;
 367                 sdata->vif.cfg.ibss_creator = false;
 368                 sdata->vif.bss_conf.enable_beacon = false;
 369                 sdata->vif.cfg.ssid_len = 0;
 370                 RCU_INIT_POINTER(ifibss->presp, NULL);
 371                 kfree_rcu(presp, rcu_head);
 372                 mutex_lock(&local->mtx);
 373                 ieee80211_link_release_channel(&sdata->deflink);
 374                 mutex_unlock(&local->mtx);
 375                 sdata_info(sdata, "Failed to join IBSS, driver failure: %d\n",
 376                            err);
 377                 return;
 378         }
 379
 380         ieee80211_bss_info_change_notify(sdata, bss_change);
 381
 382         ifibss->state = IEEE80211_IBSS_MLME_JOINED;
 383         mod_timer(&ifibss->timer,
 384                   round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
 385
 386         bss_meta.chan = chan;
 387         bss_meta.scan_width = cfg80211_chandef_to_scan_width(&chandef);
 388         bss = cfg80211_inform_bss_frame_data(local->hw.wiphy, &bss_meta, mgmt,
 389                                              presp->head_len, GFP_KERNEL);
 390
 391         cfg80211_put_bss(local->hw.wiphy, bss);
 392         netif_carrier_on(sdata->dev);
 393         cfg80211_ibss_joined(sdata->dev, ifibss->bssid, chan, GFP_KERNEL);
 394 }
 395
 396 static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
 397                                     struct ieee80211_bss *bss)
 398 {
 399         struct cfg80211_bss *cbss =
 400                 container_of((void *)bss, struct cfg80211_bss, priv);
 401         struct ieee80211_supported_band *sband;
 402         struct cfg80211_chan_def chandef;
 403         u32 basic_rates;
 404         int i, j;
 405         u16 beacon_int = cbss->beacon_interval;
 406         const struct cfg80211_bss_ies *ies;
 407         enum nl80211_channel_type chan_type;
 408         u64 tsf;
 409         u32 rate_flags;
 410         int shift;
 411
 412         sdata_assert_lock(sdata);
 413
 414         if (beacon_int < 10)
 415                 beacon_int = 10;
 416
 417         switch (sdata->u.ibss.chandef.width) {
 418         case NL80211_CHAN_WIDTH_20_NOHT:
 419         case NL80211_CHAN_WIDTH_20:
 420         case NL80211_CHAN_WIDTH_40:
 421                 chan_type = cfg80211_get_chandef_type(&sdata->u.ibss.chandef);
 422                 cfg80211_chandef_create(&chandef, cbss->channel, chan_type);
 423                 break;
 424         case NL80211_CHAN_WIDTH_5:
 425         case NL80211_CHAN_WIDTH_10:
 426                 cfg80211_chandef_create(&chandef, cbss->channel,
 427                                         NL80211_CHAN_NO_HT);
 428                 chandef.width = sdata->u.ibss.chandef.width;
 429                 break;
 430         case NL80211_CHAN_WIDTH_80:
 431         case NL80211_CHAN_WIDTH_80P80:
 432         case NL80211_CHAN_WIDTH_160:
 433                 chandef = sdata->u.ibss.chandef;
 434                 chandef.chan = cbss->channel;
 435                 break;
 436         default:
 437                 /* fall back to 20 MHz for unsupported modes */
 438                 cfg80211_chandef_create(&chandef, cbss->channel,
 439                                         NL80211_CHAN_NO_HT);
 440                 break;
 441         }
 442
 443         sband = sdata->local->hw.wiphy->bands[cbss->channel->band];
 444         rate_flags = ieee80211_chandef_rate_flags(&sdata->u.ibss.chandef);
 445         shift = ieee80211_vif_get_shift(&sdata->vif);
 446
 447         basic_rates = 0;
 448
 449         for (i = 0; i < bss->supp_rates_len; i++) {
 450                 int rate = bss->supp_rates[i] & 0x7f;
 451                 bool is_basic = !!(bss->supp_rates[i] & 0x80);
 452
 453                 for (j = 0; j < sband->n_bitrates; j++) {
 454                         int brate;
 455                         if ((rate_flags & sband->bitrates[j].flags)
 456                             != rate_flags)
 457                                 continue;
 458
 459                         brate = DIV_ROUND_UP(sband->bitrates[j].bitrate,
 460                                              5 * (1 << shift));
 461                         if (brate == rate) {
 462                                 if (is_basic)
 463                                         basic_rates |= BIT(j);
 464                                 break;
 465                         }
 466                 }
 467         }
 468
 469         rcu_read_lock();
 470         ies = rcu_dereference(cbss->ies);
 471         tsf = ies->tsf;
 472         rcu_read_unlock();
 473
 474         __ieee80211_sta_join_ibss(sdata, cbss->bssid,
 475                                   beacon_int,
 476                                   &chandef,
 477                                   basic_rates,
 478                                   cbss->capability,
 479                                   tsf, false);
 480 }
 481
 482 int ieee80211_ibss_csa_beacon(struct ieee80211_sub_if_data *sdata,
 483                               struct cfg80211_csa_settings *csa_settings)
 484 {
 485         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 486         struct beacon_data *presp, *old_presp;
 487         struct cfg80211_bss *cbss;
 488         const struct cfg80211_bss_ies *ies;
 489         u16 capability = WLAN_CAPABILITY_IBSS;
 490         u64 tsf;
 491
 492         sdata_assert_lock(sdata);
 493
 494         if (ifibss->privacy)
 495                 capability |= WLAN_CAPABILITY_PRIVACY;
 496
 497         cbss = cfg80211_get_bss(sdata->local->hw.wiphy, ifibss->chandef.chan,
 498                                 ifibss->bssid, ifibss->ssid,
 499                                 ifibss->ssid_len, IEEE80211_BSS_TYPE_IBSS,
 500                                 IEEE80211_PRIVACY(ifibss->privacy));
 501
 502         if (WARN_ON(!cbss))
 503                 return -EINVAL;
 504
 505         rcu_read_lock();
 506         ies = rcu_dereference(cbss->ies);
 507         tsf = ies->tsf;
 508         rcu_read_unlock();
 509         cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
 510
 511         old_presp = sdata_dereference(ifibss->presp, sdata);
 512
 513         presp = ieee80211_ibss_build_presp(sdata,
 514                                            sdata->vif.bss_conf.beacon_int,
 515                                            sdata->vif.bss_conf.basic_rates,
 516                                            capability, tsf, &ifibss->chandef,
 517                                            NULL, csa_settings);
 518         if (!presp)
 519                 return -ENOMEM;
 520
 521         rcu_assign_pointer(ifibss->presp, presp);
 522         if (old_presp)
 523                 kfree_rcu(old_presp, rcu_head);
 524
 525         return BSS_CHANGED_BEACON;
 526 }
 527
 528 int ieee80211_ibss_finish_csa(struct ieee80211_sub_if_data *sdata)
 529 {
 530         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 531         struct cfg80211_bss *cbss;
 532
 533         sdata_assert_lock(sdata);
 534
 535         /* update cfg80211 bss information with the new channel */
 536         if (!is_zero_ether_addr(ifibss->bssid)) {
 537                 cbss = cfg80211_get_bss(sdata->local->hw.wiphy,
 538                                         ifibss->chandef.chan,
 539                                         ifibss->bssid, ifibss->ssid,
 540                                         ifibss->ssid_len,
 541                                         IEEE80211_BSS_TYPE_IBSS,
 542                                         IEEE80211_PRIVACY(ifibss->privacy));
 543                 /* XXX: should not really modify cfg80211 data */
 544                 if (cbss) {
 545                         cbss->channel = sdata->deflink.csa_chandef.chan;
 546                         cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
 547                 }
 548         }
 549
 550         ifibss->chandef = sdata->deflink.csa_chandef;
 551
 552         /* generate the beacon */
 553         return ieee80211_ibss_csa_beacon(sdata, NULL);
 554 }
 555
 556 void ieee80211_ibss_stop(struct ieee80211_sub_if_data *sdata)
 557 {
 558         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 559
 560         cancel_work_sync(&ifibss->csa_connection_drop_work);
 561 }
 562
 563 static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta)
 564         __acquires(RCU)
 565 {
 566         struct ieee80211_sub_if_data *sdata = sta->sdata;
 567         u8 addr[ETH_ALEN];
 568
 569         memcpy(addr, sta->sta.addr, ETH_ALEN);
 570
 571         ibss_dbg(sdata, "Adding new IBSS station %pM\n", addr);
 572
 573         sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
 574         sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
 575         /* authorize the station only if the network is not RSN protected. If
 576          * not wait for the userspace to authorize it */
 577         if (!sta->sdata->u.ibss.control_port)
 578                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
 579
 580         rate_control_rate_init(sta);
 581
 582         /* If it fails, maybe we raced another insertion? */
 583         if (sta_info_insert_rcu(sta))
 584                 return sta_info_get(sdata, addr);
 585         return sta;
 586 }
 587
 588 static struct sta_info *
 589 ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, const u8 *bssid,
 590                        const u8 *addr, u32 supp_rates)
 591         __acquires(RCU)
 592 {
 593         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 594         struct ieee80211_local *local = sdata->local;
 595         struct sta_info *sta;
 596         struct ieee80211_chanctx_conf *chanctx_conf;
 597         struct ieee80211_supported_band *sband;
 598         enum nl80211_bss_scan_width scan_width;
 599         int band;
 600
 601         /*
 602          * XXX: Consider removing the least recently used entry and
 603          *      allow new one to be added.
 604          */
 605         if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
 606                 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
 607                                     sdata->name, addr);
 608                 rcu_read_lock();
 609                 return NULL;
 610         }
 611
 612         if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) {
 613                 rcu_read_lock();
 614                 return NULL;
 615         }
 616
 617         if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) {
 618                 rcu_read_lock();
 619                 return NULL;
 620         }
 621
 622         rcu_read_lock();
 623         chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
 624         if (WARN_ON_ONCE(!chanctx_conf))
 625                 return NULL;
 626         band = chanctx_conf->def.chan->band;
 627         scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
 628         rcu_read_unlock();
 629
 630         sta = sta_info_alloc(sdata, addr, -1, GFP_KERNEL);
 631         if (!sta) {
 632                 rcu_read_lock();
 633                 return NULL;
 634         }
 635
 636         /* make sure mandatory rates are always added */
 637         sband = local->hw.wiphy->bands[band];
 638         sta->sta.deflink.supp_rates[band] = supp_rates |
 639                         ieee80211_mandatory_rates(sband, scan_width);
 640
 641         return ieee80211_ibss_finish_sta(sta);
 642 }
 643
 644 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
 645 {
 646         struct ieee80211_local *local = sdata->local;
 647         int active = 0;
 648         struct sta_info *sta;
 649
 650         sdata_assert_lock(sdata);
 651
 652         rcu_read_lock();
 653
 654         list_for_each_entry_rcu(sta, &local->sta_list, list) {
 655                 unsigned long last_active = ieee80211_sta_last_active(sta);
 656
 657                 if (sta->sdata == sdata &&
 658                     time_is_after_jiffies(last_active +
 659                                           IEEE80211_IBSS_MERGE_INTERVAL)) {
 660                         active++;
 661                         break;
 662                 }
 663         }
 664
 665         rcu_read_unlock();
 666
 667         return active;
 668 }
 669
 670 static void ieee80211_ibss_disconnect(struct ieee80211_sub_if_data *sdata)
 671 {
 672         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 673         struct ieee80211_local *local = sdata->local;
 674         struct cfg80211_bss *cbss;
 675         struct beacon_data *presp;
 676         struct sta_info *sta;
 677
 678         if (!is_zero_ether_addr(ifibss->bssid)) {
 679                 cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->chandef.chan,
 680                                         ifibss->bssid, ifibss->ssid,
 681                                         ifibss->ssid_len,
 682                                         IEEE80211_BSS_TYPE_IBSS,
 683                                         IEEE80211_PRIVACY(ifibss->privacy));
 684
 685                 if (cbss) {
 686                         cfg80211_unlink_bss(local->hw.wiphy, cbss);
 687                         cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
 688                 }
 689         }
 690
 691         ifibss->state = IEEE80211_IBSS_MLME_SEARCH;
 692
 693         sta_info_flush(sdata);
 694
 695         spin_lock_bh(&ifibss->incomplete_lock);
 696         while (!list_empty(&ifibss->incomplete_stations)) {
 697                 sta = list_first_entry(&ifibss->incomplete_stations,
 698                                        struct sta_info, list);
 699                 list_del(&sta->list);
 700                 spin_unlock_bh(&ifibss->incomplete_lock);
 701
 702                 sta_info_free(local, sta);
 703                 spin_lock_bh(&ifibss->incomplete_lock);
 704         }
 705         spin_unlock_bh(&ifibss->incomplete_lock);
 706
 707         netif_carrier_off(sdata->dev);
 708
 709         sdata->vif.cfg.ibss_joined = false;
 710         sdata->vif.cfg.ibss_creator = false;
 711         sdata->vif.bss_conf.enable_beacon = false;
 712         sdata->vif.cfg.ssid_len = 0;
 713
 714         /* remove beacon */
 715         presp = sdata_dereference(ifibss->presp, sdata);
 716         RCU_INIT_POINTER(sdata->u.ibss.presp, NULL);
 717         if (presp)
 718                 kfree_rcu(presp, rcu_head);
 719
 720         clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state);
 721         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED |
 722                                                 BSS_CHANGED_IBSS);
 723         drv_leave_ibss(local, sdata);
 724         mutex_lock(&local->mtx);
 725         ieee80211_link_release_channel(&sdata->deflink);
 726         mutex_unlock(&local->mtx);
 727 }
 728
 729 static void ieee80211_csa_connection_drop_work(struct work_struct *work)
 730 {
 731         struct ieee80211_sub_if_data *sdata =
 732                 container_of(work, struct ieee80211_sub_if_data,
 733                              u.ibss.csa_connection_drop_work);
 734
 735         sdata_lock(sdata);
 736
 737         ieee80211_ibss_disconnect(sdata);
 738         synchronize_rcu();
 739         skb_queue_purge(&sdata->skb_queue);
 740
 741         /* trigger a scan to find another IBSS network to join */
 742         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
 743
 744         sdata_unlock(sdata);
 745 }
 746
 747 static void ieee80211_ibss_csa_mark_radar(struct ieee80211_sub_if_data *sdata)
 748 {
 749         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 750         int err;
 751
 752         /* if the current channel is a DFS channel, mark the channel as
 753          * unavailable.
 754          */
 755         err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
 756                                             &ifibss->chandef,
 757                                             NL80211_IFTYPE_ADHOC);
 758         if (err > 0)
 759                 cfg80211_radar_event(sdata->local->hw.wiphy, &ifibss->chandef,
 760                                      GFP_ATOMIC);
 761 }
 762
 763 static bool
 764 ieee80211_ibss_process_chanswitch(struct ieee80211_sub_if_data *sdata,
 765                                   struct ieee802_11_elems *elems,
 766                                   bool beacon)
 767 {
 768         struct cfg80211_csa_settings params;
 769         struct ieee80211_csa_ie csa_ie;
 770         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 771         enum nl80211_channel_type ch_type;
 772         int err;
 773         ieee80211_conn_flags_t conn_flags;
 774         u32 vht_cap_info = 0;
 775
 776         sdata_assert_lock(sdata);
 777
 778         conn_flags = IEEE80211_CONN_DISABLE_VHT;
 779
 780         switch (ifibss->chandef.width) {
 781         case NL80211_CHAN_WIDTH_5:
 782         case NL80211_CHAN_WIDTH_10:
 783         case NL80211_CHAN_WIDTH_20_NOHT:
 784                 conn_flags |= IEEE80211_CONN_DISABLE_HT;
 785                 fallthrough;
 786         case NL80211_CHAN_WIDTH_20:
 787                 conn_flags |= IEEE80211_CONN_DISABLE_40MHZ;
 788                 break;
 789         default:
 790                 break;
 791         }
 792
 793         if (elems->vht_cap_elem)
 794                 vht_cap_info = le32_to_cpu(elems->vht_cap_elem->vht_cap_info);
 795
 796         memset(&params, 0, sizeof(params));
 797         err = ieee80211_parse_ch_switch_ie(sdata, elems,
 798                                            ifibss->chandef.chan->band,
 799                                            vht_cap_info,
 800                                            conn_flags, ifibss->bssid, &csa_ie);
 801         /* can't switch to destination channel, fail */
 802         if (err < 0)
 803                 goto disconnect;
 804
 805         /* did not contain a CSA */
 806         if (err)
 807                 return false;
 808
 809         /* channel switch is not supported, disconnect */
 810         if (!(sdata->local->hw.wiphy->flags & WIPHY_FLAG_HAS_CHANNEL_SWITCH))
 811                 goto disconnect;
 812
 813         params.count = csa_ie.count;
 814         params.chandef = csa_ie.chandef;
 815
 816         switch (ifibss->chandef.width) {
 817         case NL80211_CHAN_WIDTH_20_NOHT:
 818         case NL80211_CHAN_WIDTH_20:
 819         case NL80211_CHAN_WIDTH_40:
 820                 /* keep our current HT mode (HT20/HT40+/HT40-), even if
 821                  * another mode  has been announced. The mode is not adopted
 822                  * within the beacon while doing CSA and we should therefore
 823                  * keep the mode which we announce.
 824                  */
 825                 ch_type = cfg80211_get_chandef_type(&ifibss->chandef);
 826                 cfg80211_chandef_create(&params.chandef, params.chandef.chan,
 827                                         ch_type);
 828                 break;
 829         case NL80211_CHAN_WIDTH_5:
 830         case NL80211_CHAN_WIDTH_10:
 831                 if (params.chandef.width != ifibss->chandef.width) {
 832                         sdata_info(sdata,
 833                                    "IBSS %pM received channel switch from incompatible channel width (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
 834                                    ifibss->bssid,
 835                                    params.chandef.chan->center_freq,
 836                                    params.chandef.width,
 837                                    params.chandef.center_freq1,
 838                                    params.chandef.center_freq2);
 839                         goto disconnect;
 840                 }
 841                 break;
 842         default:
 843                 /* should not happen, conn_flags should prevent VHT modes. */
 844                 WARN_ON(1);
 845                 goto disconnect;
 846         }
 847
 848         if (!cfg80211_reg_can_beacon(sdata->local->hw.wiphy, &params.chandef,
 849                                      NL80211_IFTYPE_ADHOC)) {
 850                 sdata_info(sdata,
 851                            "IBSS %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
 852                            ifibss->bssid,
 853                            params.chandef.chan->center_freq,
 854                            params.chandef.width,
 855                            params.chandef.center_freq1,
 856                            params.chandef.center_freq2);
 857                 goto disconnect;
 858         }
 859
 860         err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
 861                                             &params.chandef,
 862                                             NL80211_IFTYPE_ADHOC);
 863         if (err < 0)
 864                 goto disconnect;
 865         if (err > 0 && !ifibss->userspace_handles_dfs) {
 866                 /* IBSS-DFS only allowed with a control program */
 867                 goto disconnect;
 868         }
 869
 870         params.radar_required = err;
 871
 872         if (cfg80211_chandef_identical(&params.chandef,
 873                                        &sdata->vif.bss_conf.chandef)) {
 874                 ibss_dbg(sdata,
 875                          "received csa with an identical chandef, ignoring\n");
 876                 return true;
 877         }
 878
 879         /* all checks done, now perform the channel switch. */
 880         ibss_dbg(sdata,
 881                  "received channel switch announcement to go to channel %d MHz\n",
 882                  params.chandef.chan->center_freq);
 883
 884         params.block_tx = !!csa_ie.mode;
 885
 886         if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev,
 887                                      &params))
 888                 goto disconnect;
 889
 890         ieee80211_ibss_csa_mark_radar(sdata);
 891
 892         return true;
 893 disconnect:
 894         ibss_dbg(sdata, "Can't handle channel switch, disconnect\n");
 895         ieee80211_queue_work(&sdata->local->hw,
 896                              &ifibss->csa_connection_drop_work);
 897
 898         ieee80211_ibss_csa_mark_radar(sdata);
 899
 900         return true;
 901 }
 902
 903 static void
 904 ieee80211_rx_mgmt_spectrum_mgmt(struct ieee80211_sub_if_data *sdata,
 905                                 struct ieee80211_mgmt *mgmt, size_t len,
 906                                 struct ieee80211_rx_status *rx_status,
 907                                 struct ieee802_11_elems *elems)
 908 {
 909         int required_len;
 910
 911         if (len < IEEE80211_MIN_ACTION_SIZE + 1)
 912                 return;
 913
 914         /* CSA is the only action we handle for now */
 915         if (mgmt->u.action.u.measurement.action_code !=
 916             WLAN_ACTION_SPCT_CHL_SWITCH)
 917                 return;
 918
 919         required_len = IEEE80211_MIN_ACTION_SIZE +
 920                        sizeof(mgmt->u.action.u.chan_switch);
 921         if (len < required_len)
 922                 return;
 923
 924         if (!sdata->vif.bss_conf.csa_active)
 925                 ieee80211_ibss_process_chanswitch(sdata, elems, false);
 926 }
 927
 928 static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data *sdata,
 929                                           struct ieee80211_mgmt *mgmt,
 930                                           size_t len)
 931 {
 932         u16 reason = le16_to_cpu(mgmt->u.deauth.reason_code);
 933
 934         if (len < IEEE80211_DEAUTH_FRAME_LEN)
 935                 return;
 936
 937         ibss_dbg(sdata, "RX DeAuth SA=%pM DA=%pM\n", mgmt->sa, mgmt->da);
 938         ibss_dbg(sdata, "\tBSSID=%pM (reason: %d)\n", mgmt->bssid, reason);
 939         sta_info_destroy_addr(sdata, mgmt->sa);
 940 }
 941
 942 static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata,
 943                                         struct ieee80211_mgmt *mgmt,
 944                                         size_t len)
 945 {
 946         u16 auth_alg, auth_transaction;
 947
 948         sdata_assert_lock(sdata);
 949
 950         if (len < 24 + 6)
 951                 return;
 952
 953         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
 954         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
 955
 956         ibss_dbg(sdata, "RX Auth SA=%pM DA=%pM\n", mgmt->sa, mgmt->da);
 957         ibss_dbg(sdata, "\tBSSID=%pM (auth_transaction=%d)\n",
 958                  mgmt->bssid, auth_transaction);
 959
 960         if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
 961                 return;
 962
 963         /*
 964          * IEEE 802.11 standard does not require authentication in IBSS
 965          * networks and most implementations do not seem to use it.
 966          * However, try to reply to authentication attempts if someone
 967          * has actually implemented this.
 968          */
 969         ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, 0, NULL, 0,
 970                             mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0, 0);
 971 }
 972
 973 static void ieee80211_update_sta_info(struct ieee80211_sub_if_data *sdata,
 974                                       struct ieee80211_mgmt *mgmt, size_t len,
 975                                       struct ieee80211_rx_status *rx_status,
 976                                       struct ieee802_11_elems *elems,
 977                                       struct ieee80211_channel *channel)
 978 {
 979         struct sta_info *sta;
 980         enum nl80211_band band = rx_status->band;
 981         enum nl80211_bss_scan_width scan_width;
 982         struct ieee80211_local *local = sdata->local;
 983         struct ieee80211_supported_band *sband;
 984         bool rates_updated = false;
 985         u32 supp_rates = 0;
 986
 987         if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
 988                 return;
 989
 990         if (!ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid))
 991                 return;
 992
 993         sband = local->hw.wiphy->bands[band];
 994         if (WARN_ON(!sband))
 995                 return;
 996
 997         rcu_read_lock();
 998         sta = sta_info_get(sdata, mgmt->sa);
 999
1000         if (elems->supp_rates) {
1001                 supp_rates = ieee80211_sta_get_rates(sdata, elems,
1002                                                      band, NULL);
1003                 if (sta) {
1004                         u32 prev_rates;
1005
1006                         prev_rates = sta->sta.deflink.supp_rates[band];
1007                         /* make sure mandatory rates are always added */
1008                         scan_width = NL80211_BSS_CHAN_WIDTH_20;
1009                         if (rx_status->bw == RATE_INFO_BW_5)
1010                                 scan_width = NL80211_BSS_CHAN_WIDTH_5;
1011                         else if (rx_status->bw == RATE_INFO_BW_10)
1012                                 scan_width = NL80211_BSS_CHAN_WIDTH_10;
1013
1014                         sta->sta.deflink.supp_rates[band] = supp_rates |
1015                                 ieee80211_mandatory_rates(sband, scan_width);
1016                         if (sta->sta.deflink.supp_rates[band] != prev_rates) {
1017                                 ibss_dbg(sdata,
1018                                          "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n",
1019                                          sta->sta.addr, prev_rates,
1020                                          sta->sta.deflink.supp_rates[band]);
1021                                 rates_updated = true;
1022                         }
1023                 } else {
1024                         rcu_read_unlock();
1025                         sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid,
1026                                                      mgmt->sa, supp_rates);
1027                 }
1028         }
1029
1030         if (sta && !sta->sta.wme &&
1031             (elems->wmm_info || elems->s1g_capab) &&
1032             local->hw.queues >= IEEE80211_NUM_ACS) {
1033                 sta->sta.wme = true;
1034                 ieee80211_check_fast_xmit(sta);
1035         }
1036
1037         if (sta && elems->ht_operation && elems->ht_cap_elem &&
1038             sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20_NOHT &&
1039             sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_5 &&
1040             sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_10) {
1041                 /* we both use HT */
1042                 struct ieee80211_ht_cap htcap_ie;
1043                 struct cfg80211_chan_def chandef;
1044                 enum ieee80211_sta_rx_bandwidth bw = sta->sta.deflink.bandwidth;
1045
1046                 cfg80211_chandef_create(&chandef, channel, NL80211_CHAN_NO_HT);
1047                 ieee80211_chandef_ht_oper(elems->ht_operation, &chandef);
1048
1049                 memcpy(&htcap_ie, elems->ht_cap_elem, sizeof(htcap_ie));
1050                 rates_updated |= ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
1051                                                                    &htcap_ie,
1052                                                                    &sta->deflink);
1053
1054                 if (elems->vht_operation && elems->vht_cap_elem &&
1055                     sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20 &&
1056                     sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_40) {
1057                         /* we both use VHT */
1058                         struct ieee80211_vht_cap cap_ie;
1059                         struct ieee80211_sta_vht_cap cap = sta->sta.deflink.vht_cap;
1060                         u32 vht_cap_info =
1061                                 le32_to_cpu(elems->vht_cap_elem->vht_cap_info);
1062
1063                         ieee80211_chandef_vht_oper(&local->hw, vht_cap_info,
1064                                                    elems->vht_operation,
1065                                                    elems->ht_operation,
1066                                                    &chandef);
1067                         memcpy(&cap_ie, elems->vht_cap_elem, sizeof(cap_ie));
1068                         ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
1069                                                             &cap_ie,
1070                                                             &sta->deflink);
1071                         if (memcmp(&cap, &sta->sta.deflink.vht_cap, sizeof(cap)))
1072                                 rates_updated |= true;
1073                 }
1074
1075                 if (bw != sta->sta.deflink.bandwidth)
1076                         rates_updated |= true;
1077
1078                 if (!cfg80211_chandef_compatible(&sdata->u.ibss.chandef,
1079                                                  &chandef))
1080                         WARN_ON_ONCE(1);
1081         }
1082
1083         if (sta && rates_updated) {
1084                 u32 changed = IEEE80211_RC_SUPP_RATES_CHANGED;
1085                 u8 rx_nss = sta->sta.deflink.rx_nss;
1086
1087                 /* Force rx_nss recalculation */
1088                 sta->sta.deflink.rx_nss = 0;
1089                 rate_control_rate_init(sta);
1090                 if (sta->sta.deflink.rx_nss != rx_nss)
1091                         changed |= IEEE80211_RC_NSS_CHANGED;
1092
1093                 drv_sta_rc_update(local, sdata, &sta->sta, changed);
1094         }
1095
1096         rcu_read_unlock();
1097 }
1098
1099 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1100                                   struct ieee80211_mgmt *mgmt, size_t len,
1101                                   struct ieee80211_rx_status *rx_status,
1102                                   struct ieee802_11_elems *elems)
1103 {
1104         struct ieee80211_local *local = sdata->local;
1105         struct cfg80211_bss *cbss;
1106         struct ieee80211_bss *bss;
1107         struct ieee80211_channel *channel;
1108         u64 beacon_timestamp, rx_timestamp;
1109         u32 supp_rates = 0;
1110         enum nl80211_band band = rx_status->band;
1111
1112         channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
1113         if (!channel)
1114                 return;
1115
1116         ieee80211_update_sta_info(sdata, mgmt, len, rx_status, elems, channel);
1117
1118         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, channel);
1119         if (!bss)
1120                 return;
1121
1122         cbss = container_of((void *)bss, struct cfg80211_bss, priv);
1123
1124         /* same for beacon and probe response */
1125         beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp);
1126
1127         /* check if we need to merge IBSS */
1128
1129         /* not an IBSS */
1130         if (!(cbss->capability & WLAN_CAPABILITY_IBSS))
1131                 goto put_bss;
1132
1133         /* different channel */
1134         if (sdata->u.ibss.fixed_channel &&
1135             sdata->u.ibss.chandef.chan != cbss->channel)
1136                 goto put_bss;
1137
1138         /* different SSID */
1139         if (elems->ssid_len != sdata->u.ibss.ssid_len ||
1140             memcmp(elems->ssid, sdata->u.ibss.ssid,
1141                                 sdata->u.ibss.ssid_len))
1142                 goto put_bss;
1143
1144         /* process channel switch */
1145         if (sdata->vif.bss_conf.csa_active ||
1146             ieee80211_ibss_process_chanswitch(sdata, elems, true))
1147                 goto put_bss;
1148
1149         /* same BSSID */
1150         if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid))
1151                 goto put_bss;
1152
1153         /* we use a fixed BSSID */
1154         if (sdata->u.ibss.fixed_bssid)
1155                 goto put_bss;
1156
1157         if (ieee80211_have_rx_timestamp(rx_status)) {
1158                 /* time when timestamp field was received */
1159                 rx_timestamp =
1160                         ieee80211_calculate_rx_timestamp(local, rx_status,
1161                                                          len + FCS_LEN, 24);
1162         } else {
1163                 /*
1164                  * second best option: get current TSF
1165                  * (will return -1 if not supported)
1166                  */
1167                 rx_timestamp = drv_get_tsf(local, sdata);
1168         }
1169
1170         ibss_dbg(sdata, "RX beacon SA=%pM BSSID=%pM TSF=0x%llx\n",
1171                  mgmt->sa, mgmt->bssid,
1172                  (unsigned long long)rx_timestamp);
1173         ibss_dbg(sdata, "\tBCN=0x%llx diff=%lld @%lu\n",
1174                  (unsigned long long)beacon_timestamp,
1175                  (unsigned long long)(rx_timestamp - beacon_timestamp),
1176                  jiffies);
1177
1178         if (beacon_timestamp > rx_timestamp) {
1179                 ibss_dbg(sdata,
1180                          "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n",
1181                          mgmt->bssid);
1182                 ieee80211_sta_join_ibss(sdata, bss);
1183                 supp_rates = ieee80211_sta_get_rates(sdata, elems, band, NULL);
1184                 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa,
1185                                        supp_rates);
1186                 rcu_read_unlock();
1187         }
1188
1189  put_bss:
1190         ieee80211_rx_bss_put(local, bss);
1191 }
1192
1193 void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata,
1194                               const u8 *bssid, const u8 *addr,
1195                               u32 supp_rates)
1196 {
1197         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1198         struct ieee80211_local *local = sdata->local;
1199         struct sta_info *sta;
1200         struct ieee80211_chanctx_conf *chanctx_conf;
1201         struct ieee80211_supported_band *sband;
1202         enum nl80211_bss_scan_width scan_width;
1203         int band;
1204
1205         /*
1206          * XXX: Consider removing the least recently used entry and
1207          *      allow new one to be added.
1208          */
1209         if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
1210                 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
1211                                     sdata->name, addr);
1212                 return;
1213         }
1214
1215         if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH)
1216                 return;
1217
1218         if (!ether_addr_equal(bssid, sdata->u.ibss.bssid))
1219                 return;
1220
1221         rcu_read_lock();
1222         chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
1223         if (WARN_ON_ONCE(!chanctx_conf)) {
1224                 rcu_read_unlock();
1225                 return;
1226         }
1227         band = chanctx_conf->def.chan->band;
1228         scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
1229         rcu_read_unlock();
1230
1231         sta = sta_info_alloc(sdata, addr, -1, GFP_ATOMIC);
1232         if (!sta)
1233                 return;
1234
1235         /* make sure mandatory rates are always added */
1236         sband = local->hw.wiphy->bands[band];
1237         sta->sta.deflink.supp_rates[band] = supp_rates |
1238                         ieee80211_mandatory_rates(sband, scan_width);
1239
1240         spin_lock(&ifibss->incomplete_lock);
1241         list_add(&sta->list, &ifibss->incomplete_stations);
1242         spin_unlock(&ifibss->incomplete_lock);
1243         ieee80211_queue_work(&local->hw, &sdata->work);
1244 }
1245
1246 static void ieee80211_ibss_sta_expire(struct ieee80211_sub_if_data *sdata)
1247 {
1248         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1249         struct ieee80211_local *local = sdata->local;
1250         struct sta_info *sta, *tmp;
1251         unsigned long exp_time = IEEE80211_IBSS_INACTIVITY_LIMIT;
1252         unsigned long exp_rsn = IEEE80211_IBSS_RSN_INACTIVITY_LIMIT;
1253
1254         mutex_lock(&local->sta_mtx);
1255
1256         list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
1257                 unsigned long last_active = ieee80211_sta_last_active(sta);
1258
1259                 if (sdata != sta->sdata)
1260                         continue;
1261
1262                 if (time_is_before_jiffies(last_active + exp_time) ||
1263                     (time_is_before_jiffies(last_active + exp_rsn) &&
1264                      sta->sta_state != IEEE80211_STA_AUTHORIZED)) {
1265                         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
1266
1267                         sta_dbg(sta->sdata, "expiring inactive %sSTA %pM\n",
1268                                 sta->sta_state != IEEE80211_STA_AUTHORIZED ?
1269                                 "not authorized " : "", sta->sta.addr);
1270
1271                         ieee80211_send_deauth_disassoc(sdata, sta->sta.addr,
1272                                                        ifibss->bssid,
1273                                                        IEEE80211_STYPE_DEAUTH,
1274                                                        WLAN_REASON_DEAUTH_LEAVING,
1275                                                        true, frame_buf);
1276                         WARN_ON(__sta_info_destroy(sta));
1277                 }
1278         }
1279
1280         mutex_unlock(&local->sta_mtx);
1281 }
1282
1283 /*
1284  * This function is called with state == IEEE80211_IBSS_MLME_JOINED
1285  */
1286
1287 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
1288 {
1289         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1290         enum nl80211_bss_scan_width scan_width;
1291
1292         sdata_assert_lock(sdata);
1293
1294         mod_timer(&ifibss->timer,
1295                   round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
1296
1297         ieee80211_ibss_sta_expire(sdata);
1298
1299         if (time_before(jiffies, ifibss->last_scan_completed +
1300                        IEEE80211_IBSS_MERGE_INTERVAL))
1301                 return;
1302
1303         if (ieee80211_sta_active_ibss(sdata))
1304                 return;
1305
1306         if (ifibss->fixed_channel)
1307                 return;
1308
1309         sdata_info(sdata,
1310                    "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n");
1311
1312         scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
1313         ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len,
1314                                     NULL, 0, scan_width);
1315 }
1316
1317 static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
1318 {
1319         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1320         u8 bssid[ETH_ALEN];
1321         u16 capability;
1322         int i;
1323
1324         sdata_assert_lock(sdata);
1325
1326         if (ifibss->fixed_bssid) {
1327                 memcpy(bssid, ifibss->bssid, ETH_ALEN);
1328         } else {
1329                 /* Generate random, not broadcast, locally administered BSSID. Mix in
1330                  * own MAC address to make sure that devices that do not have proper
1331                  * random number generator get different BSSID. */
1332                 get_random_bytes(bssid, ETH_ALEN);
1333                 for (i = 0; i < ETH_ALEN; i++)
1334                         bssid[i] ^= sdata->vif.addr[i];
1335                 bssid[0] &= ~0x01;
1336                 bssid[0] |= 0x02;
1337         }
1338
1339         sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid);
1340
1341         capability = WLAN_CAPABILITY_IBSS;
1342
1343         if (ifibss->privacy)
1344                 capability |= WLAN_CAPABILITY_PRIVACY;
1345
1346         __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int,
1347                                   &ifibss->chandef, ifibss->basic_rates,
1348                                   capability, 0, true);
1349 }
1350
1351 static unsigned ibss_setup_channels(struct wiphy *wiphy,
1352                                     struct ieee80211_channel **channels,
1353                                     unsigned int channels_max,
1354                                     u32 center_freq, u32 width)
1355 {
1356         struct ieee80211_channel *chan = NULL;
1357         unsigned int n_chan = 0;
1358         u32 start_freq, end_freq, freq;
1359
1360         if (width <= 20) {
1361                 start_freq = center_freq;
1362                 end_freq = center_freq;
1363         } else {
1364                 start_freq = center_freq - width / 2 + 10;
1365                 end_freq = center_freq + width / 2 - 10;
1366         }
1367
1368         for (freq = start_freq; freq <= end_freq; freq += 20) {
1369                 chan = ieee80211_get_channel(wiphy, freq);
1370                 if (!chan)
1371                         continue;
1372                 if (n_chan >= channels_max)
1373                         return n_chan;
1374
1375                 channels[n_chan] = chan;
1376                 n_chan++;
1377         }
1378
1379         return n_chan;
1380 }
1381
1382 static unsigned int
1383 ieee80211_ibss_setup_scan_channels(struct wiphy *wiphy,
1384                                    const struct cfg80211_chan_def *chandef,
1385                                    struct ieee80211_channel **channels,
1386                                    unsigned int channels_max)
1387 {
1388         unsigned int n_chan = 0;
1389         u32 width, cf1, cf2 = 0;
1390
1391         switch (chandef->width) {
1392         case NL80211_CHAN_WIDTH_40:
1393                 width = 40;
1394                 break;
1395         case NL80211_CHAN_WIDTH_80P80:
1396                 cf2 = chandef->center_freq2;
1397                 fallthrough;
1398         case NL80211_CHAN_WIDTH_80:
1399                 width = 80;
1400                 break;
1401         case NL80211_CHAN_WIDTH_160:
1402                 width = 160;
1403                 break;
1404         default:
1405                 width = 20;
1406                 break;
1407         }
1408
1409         cf1 = chandef->center_freq1;
1410
1411         n_chan = ibss_setup_channels(wiphy, channels, channels_max, cf1, width);
1412
1413         if (cf2)
1414                 n_chan += ibss_setup_channels(wiphy, &channels[n_chan],
1415                                               channels_max - n_chan, cf2,
1416                                               width);
1417
1418         return n_chan;
1419 }
1420
1421 /*
1422  * This function is called with state == IEEE80211_IBSS_MLME_SEARCH
1423  */
1424
1425 static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
1426 {
1427         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1428         struct ieee80211_local *local = sdata->local;
1429         struct cfg80211_bss *cbss;
1430         struct ieee80211_channel *chan = NULL;
1431         const u8 *bssid = NULL;
1432         enum nl80211_bss_scan_width scan_width;
1433         int active_ibss;
1434
1435         sdata_assert_lock(sdata);
1436
1437         active_ibss = ieee80211_sta_active_ibss(sdata);
1438         ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss);
1439
1440         if (active_ibss)
1441                 return;
1442
1443         if (ifibss->fixed_bssid)
1444                 bssid = ifibss->bssid;
1445         if (ifibss->fixed_channel)
1446                 chan = ifibss->chandef.chan;
1447         if (!is_zero_ether_addr(ifibss->bssid))
1448                 bssid = ifibss->bssid;
1449         cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid,
1450                                 ifibss->ssid, ifibss->ssid_len,
1451                                 IEEE80211_BSS_TYPE_IBSS,
1452                                 IEEE80211_PRIVACY(ifibss->privacy));
1453
1454         if (cbss) {
1455                 struct ieee80211_bss *bss;
1456
1457                 bss = (void *)cbss->priv;
1458                 ibss_dbg(sdata,
1459                          "sta_find_ibss: selected %pM current %pM\n",
1460                          cbss->bssid, ifibss->bssid);
1461                 sdata_info(sdata,
1462                            "Selected IBSS BSSID %pM based on configured SSID\n",
1463                            cbss->bssid);
1464
1465                 ieee80211_sta_join_ibss(sdata, bss);
1466                 ieee80211_rx_bss_put(local, bss);
1467                 return;
1468         }
1469
1470         /* if a fixed bssid and a fixed freq have been provided create the IBSS
1471          * directly and do not waste time scanning
1472          */
1473         if (ifibss->fixed_bssid && ifibss->fixed_channel) {
1474                 sdata_info(sdata, "Created IBSS using preconfigured BSSID %pM\n",
1475                            bssid);
1476                 ieee80211_sta_create_ibss(sdata);
1477                 return;
1478         }
1479
1480
1481         ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n");
1482
1483         /* Selected IBSS not found in current scan results - try to scan */
1484         if (time_after(jiffies, ifibss->last_scan_completed +
1485                                         IEEE80211_SCAN_INTERVAL)) {
1486                 struct ieee80211_channel *channels[8];
1487                 unsigned int num;
1488
1489                 sdata_info(sdata, "Trigger new scan to find an IBSS to join\n");
1490
1491                 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
1492
1493                 if (ifibss->fixed_channel) {
1494                         num = ieee80211_ibss_setup_scan_channels(local->hw.wiphy,
1495                                                                  &ifibss->chandef,
1496                                                                  channels,
1497                                                                  ARRAY_SIZE(channels));
1498                         ieee80211_request_ibss_scan(sdata, ifibss->ssid,
1499                                                     ifibss->ssid_len, channels,
1500                                                     num, scan_width);
1501                 } else {
1502                         ieee80211_request_ibss_scan(sdata, ifibss->ssid,
1503                                                     ifibss->ssid_len, NULL,
1504                                                     0, scan_width);
1505                 }
1506         } else {
1507                 int interval = IEEE80211_SCAN_INTERVAL;
1508
1509                 if (time_after(jiffies, ifibss->ibss_join_req +
1510                                IEEE80211_IBSS_JOIN_TIMEOUT))
1511                         ieee80211_sta_create_ibss(sdata);
1512
1513                 mod_timer(&ifibss->timer,
1514                           round_jiffies(jiffies + interval));
1515         }
1516 }
1517
1518 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
1519                                         struct sk_buff *req)
1520 {
1521         struct ieee80211_mgmt *mgmt = (void *)req->data;
1522         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1523         struct ieee80211_local *local = sdata->local;
1524         int tx_last_beacon, len = req->len;
1525         struct sk_buff *skb;
1526         struct beacon_data *presp;
1527         u8 *pos, *end;
1528
1529         sdata_assert_lock(sdata);
1530
1531         presp = sdata_dereference(ifibss->presp, sdata);
1532
1533         if (ifibss->state != IEEE80211_IBSS_MLME_JOINED ||
1534             len < 24 + 2 || !presp)
1535                 return;
1536
1537         tx_last_beacon = drv_tx_last_beacon(local);
1538
1539         ibss_dbg(sdata, "RX ProbeReq SA=%pM DA=%pM\n", mgmt->sa, mgmt->da);
1540         ibss_dbg(sdata, "\tBSSID=%pM (tx_last_beacon=%d)\n",
1541                  mgmt->bssid, tx_last_beacon);
1542
1543         if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da))
1544                 return;
1545
1546         if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) &&
1547             !is_broadcast_ether_addr(mgmt->bssid))
1548                 return;
1549
1550         end = ((u8 *) mgmt) + len;
1551         pos = mgmt->u.probe_req.variable;
1552         if (pos[0] != WLAN_EID_SSID ||
1553             pos + 2 + pos[1] > end) {
1554                 ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n",
1555                          mgmt->sa);
1556                 return;
1557         }
1558         if (pos[1] != 0 &&
1559             (pos[1] != ifibss->ssid_len ||
1560              memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) {
1561                 /* Ignore ProbeReq for foreign SSID */
1562                 return;
1563         }
1564
1565         /* Reply with ProbeResp */
1566         skb = dev_alloc_skb(local->tx_headroom + presp->head_len);
1567         if (!skb)
1568                 return;
1569
1570         skb_reserve(skb, local->tx_headroom);
1571         skb_put_data(skb, presp->head, presp->head_len);
1572
1573         memcpy(((struct ieee80211_mgmt *) skb->data)->da, mgmt->sa, ETH_ALEN);
1574         ibss_dbg(sdata, "Sending ProbeResp to %pM\n", mgmt->sa);
1575         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1576
1577         /* avoid excessive retries for probe request to wildcard SSIDs */
1578         if (pos[1] == 0)
1579                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_NO_ACK;
1580
1581         ieee80211_tx_skb(sdata, skb);
1582 }
1583
1584 static
1585 void ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data *sdata,
1586                                     struct ieee80211_mgmt *mgmt, size_t len,
1587                                     struct ieee80211_rx_status *rx_status)
1588 {
1589         size_t baselen;
1590         struct ieee802_11_elems *elems;
1591
1592         BUILD_BUG_ON(offsetof(typeof(mgmt->u.probe_resp), variable) !=
1593                      offsetof(typeof(mgmt->u.beacon), variable));
1594
1595         /*
1596          * either beacon or probe_resp but the variable field is at the
1597          * same offset
1598          */
1599         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1600         if (baselen > len)
1601                 return;
1602
1603         elems = ieee802_11_parse_elems(mgmt->u.probe_resp.variable,
1604                                        len - baselen, false,
1605                                        mgmt->bssid, NULL);
1606
1607         if (elems) {
1608                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, elems);
1609                 kfree(elems);
1610         }
1611 }
1612
1613 void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1614                                    struct sk_buff *skb)
1615 {
1616         struct ieee80211_rx_status *rx_status;
1617         struct ieee80211_mgmt *mgmt;
1618         u16 fc;
1619         struct ieee802_11_elems *elems;
1620         int ies_len;
1621
1622         rx_status = IEEE80211_SKB_RXCB(skb);
1623         mgmt = (struct ieee80211_mgmt *) skb->data;
1624         fc = le16_to_cpu(mgmt->frame_control);
1625
1626         sdata_lock(sdata);
1627
1628         if (!sdata->u.ibss.ssid_len)
1629                 goto mgmt_out; /* not ready to merge yet */
1630
1631         switch (fc & IEEE80211_FCTL_STYPE) {
1632         case IEEE80211_STYPE_PROBE_REQ:
1633                 ieee80211_rx_mgmt_probe_req(sdata, skb);
1634                 break;
1635         case IEEE80211_STYPE_PROBE_RESP:
1636         case IEEE80211_STYPE_BEACON:
1637                 ieee80211_rx_mgmt_probe_beacon(sdata, mgmt, skb->len,
1638                                                rx_status);
1639                 break;
1640         case IEEE80211_STYPE_AUTH:
1641                 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len);
1642                 break;
1643         case IEEE80211_STYPE_DEAUTH:
1644                 ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len);
1645                 break;
1646         case IEEE80211_STYPE_ACTION:
1647                 switch (mgmt->u.action.category) {
1648                 case WLAN_CATEGORY_SPECTRUM_MGMT:
1649                         ies_len = skb->len -
1650                                   offsetof(struct ieee80211_mgmt,
1651                                            u.action.u.chan_switch.variable);
1652
1653                         if (ies_len < 0)
1654                                 break;
1655
1656                         elems = ieee802_11_parse_elems(
1657                                 mgmt->u.action.u.chan_switch.variable,
1658                                 ies_len, true, mgmt->bssid, NULL);
1659
1660                         if (elems && !elems->parse_error)
1661                                 ieee80211_rx_mgmt_spectrum_mgmt(sdata, mgmt,
1662                                                                 skb->len,
1663                                                                 rx_status,
1664                                                                 elems);
1665                         kfree(elems);
1666                         break;
1667                 }
1668         }
1669
1670  mgmt_out:
1671         sdata_unlock(sdata);
1672 }
1673
1674 void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata)
1675 {
1676         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1677         struct sta_info *sta;
1678
1679         sdata_lock(sdata);
1680
1681         /*
1682          * Work could be scheduled after scan or similar
1683          * when we aren't even joined (or trying) with a
1684          * network.
1685          */
1686         if (!ifibss->ssid_len)
1687                 goto out;
1688
1689         spin_lock_bh(&ifibss->incomplete_lock);
1690         while (!list_empty(&ifibss->incomplete_stations)) {
1691                 sta = list_first_entry(&ifibss->incomplete_stations,
1692                                        struct sta_info, list);
1693                 list_del(&sta->list);
1694                 spin_unlock_bh(&ifibss->incomplete_lock);
1695
1696                 ieee80211_ibss_finish_sta(sta);
1697                 rcu_read_unlock();
1698                 spin_lock_bh(&ifibss->incomplete_lock);
1699         }
1700         spin_unlock_bh(&ifibss->incomplete_lock);
1701
1702         switch (ifibss->state) {
1703         case IEEE80211_IBSS_MLME_SEARCH:
1704                 ieee80211_sta_find_ibss(sdata);
1705                 break;
1706         case IEEE80211_IBSS_MLME_JOINED:
1707                 ieee80211_sta_merge_ibss(sdata);
1708                 break;
1709         default:
1710                 WARN_ON(1);
1711                 break;
1712         }
1713
1714  out:
1715         sdata_unlock(sdata);
1716 }
1717
1718 static void ieee80211_ibss_timer(struct timer_list *t)
1719 {
1720         struct ieee80211_sub_if_data *sdata =
1721                 from_timer(sdata, t, u.ibss.timer);
1722
1723         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1724 }
1725
1726 void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata)
1727 {
1728         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1729
1730         timer_setup(&ifibss->timer, ieee80211_ibss_timer, 0);
1731         INIT_LIST_HEAD(&ifibss->incomplete_stations);
1732         spin_lock_init(&ifibss->incomplete_lock);
1733         INIT_WORK(&ifibss->csa_connection_drop_work,
1734                   ieee80211_csa_connection_drop_work);
1735 }
1736
1737 /* scan finished notification */
1738 void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local)
1739 {
1740         struct ieee80211_sub_if_data *sdata;
1741
1742         mutex_lock(&local->iflist_mtx);
1743         list_for_each_entry(sdata, &local->interfaces, list) {
1744                 if (!ieee80211_sdata_running(sdata))
1745                         continue;
1746                 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
1747                         continue;
1748                 sdata->u.ibss.last_scan_completed = jiffies;
1749         }
1750         mutex_unlock(&local->iflist_mtx);
1751 }
1752
1753 int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
1754                         struct cfg80211_ibss_params *params)
1755 {
1756         u32 changed = 0;
1757         u32 rate_flags;
1758         struct ieee80211_supported_band *sband;
1759         enum ieee80211_chanctx_mode chanmode;
1760         struct ieee80211_local *local = sdata->local;
1761         int radar_detect_width = 0;
1762         int i;
1763         int ret;
1764
1765         if (params->chandef.chan->freq_offset) {
1766                 /* this may work, but is untested */
1767                 return -EOPNOTSUPP;
1768         }
1769
1770         ret = cfg80211_chandef_dfs_required(local->hw.wiphy,
1771                                             &params->chandef,
1772                                             sdata->wdev.iftype);
1773         if (ret < 0)
1774                 return ret;
1775
1776         if (ret > 0) {
1777                 if (!params->userspace_handles_dfs)
1778                         return -EINVAL;
1779                 radar_detect_width = BIT(params->chandef.width);
1780         }
1781
1782         chanmode = (params->channel_fixed && !ret) ?
1783                 IEEE80211_CHANCTX_SHARED : IEEE80211_CHANCTX_EXCLUSIVE;
1784
1785         mutex_lock(&local->chanctx_mtx);
1786         ret = ieee80211_check_combinations(sdata, &params->chandef, chanmode,
1787                                            radar_detect_width);
1788         mutex_unlock(&local->chanctx_mtx);
1789         if (ret < 0)
1790                 return ret;
1791
1792         if (params->bssid) {
1793                 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN);
1794                 sdata->u.ibss.fixed_bssid = true;
1795         } else
1796                 sdata->u.ibss.fixed_bssid = false;
1797
1798         sdata->u.ibss.privacy = params->privacy;
1799         sdata->u.ibss.control_port = params->control_port;
1800         sdata->u.ibss.userspace_handles_dfs = params->userspace_handles_dfs;
1801         sdata->u.ibss.basic_rates = params->basic_rates;
1802         sdata->u.ibss.last_scan_completed = jiffies;
1803
1804         /* fix basic_rates if channel does not support these rates */
1805         rate_flags = ieee80211_chandef_rate_flags(&params->chandef);
1806         sband = local->hw.wiphy->bands[params->chandef.chan->band];
1807         for (i = 0; i < sband->n_bitrates; i++) {
1808                 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
1809                         sdata->u.ibss.basic_rates &= ~BIT(i);
1810         }
1811         memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate,
1812                sizeof(params->mcast_rate));
1813
1814         sdata->vif.bss_conf.beacon_int = params->beacon_interval;
1815
1816         sdata->u.ibss.chandef = params->chandef;
1817         sdata->u.ibss.fixed_channel = params->channel_fixed;
1818
1819         if (params->ie) {
1820                 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len,
1821                                            GFP_KERNEL);
1822                 if (sdata->u.ibss.ie)
1823                         sdata->u.ibss.ie_len = params->ie_len;
1824         }
1825
1826         sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
1827         sdata->u.ibss.ibss_join_req = jiffies;
1828
1829         memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len);
1830         sdata->u.ibss.ssid_len = params->ssid_len;
1831
1832         memcpy(&sdata->u.ibss.ht_capa, &params->ht_capa,
1833                sizeof(sdata->u.ibss.ht_capa));
1834         memcpy(&sdata->u.ibss.ht_capa_mask, &params->ht_capa_mask,
1835                sizeof(sdata->u.ibss.ht_capa_mask));
1836
1837         /*
1838          * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is
1839          * reserved, but an HT STA shall protect HT transmissions as though
1840          * the HT Protection field were set to non-HT mixed mode.
1841          *
1842          * In an IBSS, the RIFS Mode field of the HT Operation element is
1843          * also reserved, but an HT STA shall operate as though this field
1844          * were set to 1.
1845          */
1846
1847         sdata->vif.bss_conf.ht_operation_mode |=
1848                   IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED
1849                 | IEEE80211_HT_PARAM_RIFS_MODE;
1850
1851         changed |= BSS_CHANGED_HT | BSS_CHANGED_MCAST_RATE;
1852         ieee80211_link_info_change_notify(sdata, &sdata->deflink, changed);
1853
1854         sdata->deflink.smps_mode = IEEE80211_SMPS_OFF;
1855         sdata->deflink.needed_rx_chains = local->rx_chains;
1856         sdata->control_port_over_nl80211 = params->control_port_over_nl80211;
1857
1858         ieee80211_queue_work(&local->hw, &sdata->work);
1859
1860         return 0;
1861 }
1862
1863 int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata)
1864 {
1865         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1866
1867         ieee80211_ibss_disconnect(sdata);
1868         ifibss->ssid_len = 0;
1869         eth_zero_addr(ifibss->bssid);
1870
1871         /* remove beacon */
1872         kfree(sdata->u.ibss.ie);
1873         sdata->u.ibss.ie = NULL;
1874         sdata->u.ibss.ie_len = 0;
1875
1876         /* on the next join, re-program HT parameters */
1877         memset(&ifibss->ht_capa, 0, sizeof(ifibss->ht_capa));
1878         memset(&ifibss->ht_capa_mask, 0, sizeof(ifibss->ht_capa_mask));
1879
1880         synchronize_rcu();
1881
1882         skb_queue_purge(&sdata->skb_queue);
1883
1884         del_timer_sync(&sdata->u.ibss.timer);
1885
1886         return 0;
1887 }