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) 2018-2020 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.bss_conf.ibss_joined) {
 248                 sdata->vif.bss_conf.ibss_joined = false;
 249                 sdata->vif.bss_conf.ibss_creator = false;
 250                 sdata->vif.bss_conf.enable_beacon = false;
 251                 netif_carrier_off(sdata->dev);
 252                 ieee80211_bss_info_change_notify(sdata,
 253                                                  BSS_CHANGED_IBSS |
 254                                                  BSS_CHANGED_BEACON_ENABLED);
 255                 drv_leave_ibss(local, sdata);
 256         }
 257
 258         presp = rcu_dereference_protected(ifibss->presp,
 259                                           lockdep_is_held(&sdata->wdev.mtx));
 260         RCU_INIT_POINTER(ifibss->presp, NULL);
 261         if (presp)
 262                 kfree_rcu(presp, rcu_head);
 263
 264         /* make a copy of the chandef, it could be modified below. */
 265         chandef = *req_chandef;
 266         chan = chandef.chan;
 267         if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef,
 268                                      NL80211_IFTYPE_ADHOC)) {
 269                 if (chandef.width == NL80211_CHAN_WIDTH_5 ||
 270                     chandef.width == NL80211_CHAN_WIDTH_10 ||
 271                     chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
 272                     chandef.width == NL80211_CHAN_WIDTH_20) {
 273                         sdata_info(sdata,
 274                                    "Failed to join IBSS, beacons forbidden\n");
 275                         return;
 276                 }
 277                 chandef.width = NL80211_CHAN_WIDTH_20;
 278                 chandef.center_freq1 = chan->center_freq;
 279                 /* check again for downgraded chandef */
 280                 if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef,
 281                                              NL80211_IFTYPE_ADHOC)) {
 282                         sdata_info(sdata,
 283                                    "Failed to join IBSS, beacons forbidden\n");
 284                         return;
 285                 }
 286         }
 287
 288         err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
 289                                             &chandef, NL80211_IFTYPE_ADHOC);
 290         if (err < 0) {
 291                 sdata_info(sdata,
 292                            "Failed to join IBSS, invalid chandef\n");
 293                 return;
 294         }
 295         if (err > 0 && !ifibss->userspace_handles_dfs) {
 296                 sdata_info(sdata,
 297                            "Failed to join IBSS, DFS channel without control program\n");
 298                 return;
 299         }
 300
 301         radar_required = err;
 302
 303         mutex_lock(&local->mtx);
 304         if (ieee80211_vif_use_channel(sdata, &chandef,
 305                                       ifibss->fixed_channel ?
 306                                         IEEE80211_CHANCTX_SHARED :
 307                                         IEEE80211_CHANCTX_EXCLUSIVE)) {
 308                 sdata_info(sdata, "Failed to join IBSS, no channel context\n");
 309                 mutex_unlock(&local->mtx);
 310                 return;
 311         }
 312         sdata->radar_required = radar_required;
 313         mutex_unlock(&local->mtx);
 314
 315         memcpy(ifibss->bssid, bssid, ETH_ALEN);
 316
 317         presp = ieee80211_ibss_build_presp(sdata, beacon_int, basic_rates,
 318                                            capability, tsf, &chandef,
 319                                            &have_higher_than_11mbit, NULL);
 320         if (!presp)
 321                 return;
 322
 323         rcu_assign_pointer(ifibss->presp, presp);
 324         mgmt = (void *)presp->head;
 325
 326         sdata->vif.bss_conf.enable_beacon = true;
 327         sdata->vif.bss_conf.beacon_int = beacon_int;
 328         sdata->vif.bss_conf.basic_rates = basic_rates;
 329         sdata->vif.bss_conf.ssid_len = ifibss->ssid_len;
 330         memcpy(sdata->vif.bss_conf.ssid, ifibss->ssid, ifibss->ssid_len);
 331         bss_change = BSS_CHANGED_BEACON_INT;
 332         bss_change |= ieee80211_reset_erp_info(sdata);
 333         bss_change |= BSS_CHANGED_BSSID;
 334         bss_change |= BSS_CHANGED_BEACON;
 335         bss_change |= BSS_CHANGED_BEACON_ENABLED;
 336         bss_change |= BSS_CHANGED_BASIC_RATES;
 337         bss_change |= BSS_CHANGED_HT;
 338         bss_change |= BSS_CHANGED_IBSS;
 339         bss_change |= BSS_CHANGED_SSID;
 340
 341         /*
 342          * In 5 GHz/802.11a, we can always use short slot time.
 343          * (IEEE 802.11-2012 18.3.8.7)
 344          *
 345          * In 2.4GHz, we must always use long slots in IBSS for compatibility
 346          * reasons.
 347          * (IEEE 802.11-2012 19.4.5)
 348          *
 349          * HT follows these specifications (IEEE 802.11-2012 20.3.18)
 350          */
 351         sdata->vif.bss_conf.use_short_slot = chan->band == NL80211_BAND_5GHZ;
 352         bss_change |= BSS_CHANGED_ERP_SLOT;
 353
 354         /* cf. IEEE 802.11 9.2.12 */
 355         if (chan->band == NL80211_BAND_2GHZ && have_higher_than_11mbit)
 356                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
 357         else
 358                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
 359
 360         ieee80211_set_wmm_default(sdata, true, false);
 361
 362         sdata->vif.bss_conf.ibss_joined = true;
 363         sdata->vif.bss_conf.ibss_creator = creator;
 364
 365         err = drv_join_ibss(local, sdata);
 366         if (err) {
 367                 sdata->vif.bss_conf.ibss_joined = false;
 368                 sdata->vif.bss_conf.ibss_creator = false;
 369                 sdata->vif.bss_conf.enable_beacon = false;
 370                 sdata->vif.bss_conf.ssid_len = 0;
 371                 RCU_INIT_POINTER(ifibss->presp, NULL);
 372                 kfree_rcu(presp, rcu_head);
 373                 mutex_lock(&local->mtx);
 374                 ieee80211_vif_release_channel(sdata);
 375                 mutex_unlock(&local->mtx);
 376                 sdata_info(sdata, "Failed to join IBSS, driver failure: %d\n",
 377                            err);
 378                 return;
 379         }
 380
 381         ieee80211_bss_info_change_notify(sdata, bss_change);
 382
 383         ifibss->state = IEEE80211_IBSS_MLME_JOINED;
 384         mod_timer(&ifibss->timer,
 385                   round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
 386
 387         bss_meta.chan = chan;
 388         bss_meta.scan_width = cfg80211_chandef_to_scan_width(&chandef);
 389         bss = cfg80211_inform_bss_frame_data(local->hw.wiphy, &bss_meta, mgmt,
 390                                              presp->head_len, GFP_KERNEL);
 391
 392         cfg80211_put_bss(local->hw.wiphy, bss);
 393         netif_carrier_on(sdata->dev);
 394         cfg80211_ibss_joined(sdata->dev, ifibss->bssid, chan, GFP_KERNEL);
 395 }
 396
 397 static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
 398                                     struct ieee80211_bss *bss)
 399 {
 400         struct cfg80211_bss *cbss =
 401                 container_of((void *)bss, struct cfg80211_bss, priv);
 402         struct ieee80211_supported_band *sband;
 403         struct cfg80211_chan_def chandef;
 404         u32 basic_rates;
 405         int i, j;
 406         u16 beacon_int = cbss->beacon_interval;
 407         const struct cfg80211_bss_ies *ies;
 408         enum nl80211_channel_type chan_type;
 409         u64 tsf;
 410         u32 rate_flags;
 411         int shift;
 412
 413         sdata_assert_lock(sdata);
 414
 415         if (beacon_int < 10)
 416                 beacon_int = 10;
 417
 418         switch (sdata->u.ibss.chandef.width) {
 419         case NL80211_CHAN_WIDTH_20_NOHT:
 420         case NL80211_CHAN_WIDTH_20:
 421         case NL80211_CHAN_WIDTH_40:
 422                 chan_type = cfg80211_get_chandef_type(&sdata->u.ibss.chandef);
 423                 cfg80211_chandef_create(&chandef, cbss->channel, chan_type);
 424                 break;
 425         case NL80211_CHAN_WIDTH_5:
 426         case NL80211_CHAN_WIDTH_10:
 427                 cfg80211_chandef_create(&chandef, cbss->channel,
 428                                         NL80211_CHAN_NO_HT);
 429                 chandef.width = sdata->u.ibss.chandef.width;
 430                 break;
 431         case NL80211_CHAN_WIDTH_80:
 432         case NL80211_CHAN_WIDTH_80P80:
 433         case NL80211_CHAN_WIDTH_160:
 434                 chandef = sdata->u.ibss.chandef;
 435                 chandef.chan = cbss->channel;
 436                 break;
 437         default:
 438                 /* fall back to 20 MHz for unsupported modes */
 439                 cfg80211_chandef_create(&chandef, cbss->channel,
 440                                         NL80211_CHAN_NO_HT);
 441                 break;
 442         }
 443
 444         sband = sdata->local->hw.wiphy->bands[cbss->channel->band];
 445         rate_flags = ieee80211_chandef_rate_flags(&sdata->u.ibss.chandef);
 446         shift = ieee80211_vif_get_shift(&sdata->vif);
 447
 448         basic_rates = 0;
 449
 450         for (i = 0; i < bss->supp_rates_len; i++) {
 451                 int rate = bss->supp_rates[i] & 0x7f;
 452                 bool is_basic = !!(bss->supp_rates[i] & 0x80);
 453
 454                 for (j = 0; j < sband->n_bitrates; j++) {
 455                         int brate;
 456                         if ((rate_flags & sband->bitrates[j].flags)
 457                             != rate_flags)
 458                                 continue;
 459
 460                         brate = DIV_ROUND_UP(sband->bitrates[j].bitrate,
 461                                              5 * (1 << shift));
 462                         if (brate == rate) {
 463                                 if (is_basic)
 464                                         basic_rates |= BIT(j);
 465                                 break;
 466                         }
 467                 }
 468         }
 469
 470         rcu_read_lock();
 471         ies = rcu_dereference(cbss->ies);
 472         tsf = ies->tsf;
 473         rcu_read_unlock();
 474
 475         __ieee80211_sta_join_ibss(sdata, cbss->bssid,
 476                                   beacon_int,
 477                                   &chandef,
 478                                   basic_rates,
 479                                   cbss->capability,
 480                                   tsf, false);
 481 }
 482
 483 int ieee80211_ibss_csa_beacon(struct ieee80211_sub_if_data *sdata,
 484                               struct cfg80211_csa_settings *csa_settings)
 485 {
 486         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 487         struct beacon_data *presp, *old_presp;
 488         struct cfg80211_bss *cbss;
 489         const struct cfg80211_bss_ies *ies;
 490         u16 capability = WLAN_CAPABILITY_IBSS;
 491         u64 tsf;
 492
 493         sdata_assert_lock(sdata);
 494
 495         if (ifibss->privacy)
 496                 capability |= WLAN_CAPABILITY_PRIVACY;
 497
 498         cbss = cfg80211_get_bss(sdata->local->hw.wiphy, ifibss->chandef.chan,
 499                                 ifibss->bssid, ifibss->ssid,
 500                                 ifibss->ssid_len, IEEE80211_BSS_TYPE_IBSS,
 501                                 IEEE80211_PRIVACY(ifibss->privacy));
 502
 503         if (WARN_ON(!cbss))
 504                 return -EINVAL;
 505
 506         rcu_read_lock();
 507         ies = rcu_dereference(cbss->ies);
 508         tsf = ies->tsf;
 509         rcu_read_unlock();
 510         cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
 511
 512         old_presp = rcu_dereference_protected(ifibss->presp,
 513                                           lockdep_is_held(&sdata->wdev.mtx));
 514
 515         presp = ieee80211_ibss_build_presp(sdata,
 516                                            sdata->vif.bss_conf.beacon_int,
 517                                            sdata->vif.bss_conf.basic_rates,
 518                                            capability, tsf, &ifibss->chandef,
 519                                            NULL, csa_settings);
 520         if (!presp)
 521                 return -ENOMEM;
 522
 523         rcu_assign_pointer(ifibss->presp, presp);
 524         if (old_presp)
 525                 kfree_rcu(old_presp, rcu_head);
 526
 527         return BSS_CHANGED_BEACON;
 528 }
 529
 530 int ieee80211_ibss_finish_csa(struct ieee80211_sub_if_data *sdata)
 531 {
 532         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 533         struct cfg80211_bss *cbss;
 534
 535         sdata_assert_lock(sdata);
 536
 537         /* When not connected/joined, sending CSA doesn't make sense. */
 538         if (ifibss->state != IEEE80211_IBSS_MLME_JOINED)
 539                 return -ENOLINK;
 540
 541         /* update cfg80211 bss information with the new channel */
 542         if (!is_zero_ether_addr(ifibss->bssid)) {
 543                 cbss = cfg80211_get_bss(sdata->local->hw.wiphy,
 544                                         ifibss->chandef.chan,
 545                                         ifibss->bssid, ifibss->ssid,
 546                                         ifibss->ssid_len,
 547                                         IEEE80211_BSS_TYPE_IBSS,
 548                                         IEEE80211_PRIVACY(ifibss->privacy));
 549                 /* XXX: should not really modify cfg80211 data */
 550                 if (cbss) {
 551                         cbss->channel = sdata->csa_chandef.chan;
 552                         cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
 553                 }
 554         }
 555
 556         ifibss->chandef = sdata->csa_chandef;
 557
 558         /* generate the beacon */
 559         return ieee80211_ibss_csa_beacon(sdata, NULL);
 560 }
 561
 562 void ieee80211_ibss_stop(struct ieee80211_sub_if_data *sdata)
 563 {
 564         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 565
 566         cancel_work_sync(&ifibss->csa_connection_drop_work);
 567 }
 568
 569 static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta)
 570         __acquires(RCU)
 571 {
 572         struct ieee80211_sub_if_data *sdata = sta->sdata;
 573         u8 addr[ETH_ALEN];
 574
 575         memcpy(addr, sta->sta.addr, ETH_ALEN);
 576
 577         ibss_dbg(sdata, "Adding new IBSS station %pM\n", addr);
 578
 579         sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
 580         sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
 581         /* authorize the station only if the network is not RSN protected. If
 582          * not wait for the userspace to authorize it */
 583         if (!sta->sdata->u.ibss.control_port)
 584                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
 585
 586         rate_control_rate_init(sta);
 587
 588         /* If it fails, maybe we raced another insertion? */
 589         if (sta_info_insert_rcu(sta))
 590                 return sta_info_get(sdata, addr);
 591         return sta;
 592 }
 593
 594 static struct sta_info *
 595 ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, const u8 *bssid,
 596                        const u8 *addr, u32 supp_rates)
 597         __acquires(RCU)
 598 {
 599         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 600         struct ieee80211_local *local = sdata->local;
 601         struct sta_info *sta;
 602         struct ieee80211_chanctx_conf *chanctx_conf;
 603         struct ieee80211_supported_band *sband;
 604         enum nl80211_bss_scan_width scan_width;
 605         int band;
 606
 607         /*
 608          * XXX: Consider removing the least recently used entry and
 609          *      allow new one to be added.
 610          */
 611         if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
 612                 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
 613                                     sdata->name, addr);
 614                 rcu_read_lock();
 615                 return NULL;
 616         }
 617
 618         if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) {
 619                 rcu_read_lock();
 620                 return NULL;
 621         }
 622
 623         if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) {
 624                 rcu_read_lock();
 625                 return NULL;
 626         }
 627
 628         rcu_read_lock();
 629         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 630         if (WARN_ON_ONCE(!chanctx_conf))
 631                 return NULL;
 632         band = chanctx_conf->def.chan->band;
 633         scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
 634         rcu_read_unlock();
 635
 636         sta = sta_info_alloc(sdata, addr, GFP_KERNEL);
 637         if (!sta) {
 638                 rcu_read_lock();
 639                 return NULL;
 640         }
 641
 642         /* make sure mandatory rates are always added */
 643         sband = local->hw.wiphy->bands[band];
 644         sta->sta.supp_rates[band] = supp_rates |
 645                         ieee80211_mandatory_rates(sband, scan_width);
 646
 647         return ieee80211_ibss_finish_sta(sta);
 648 }
 649
 650 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
 651 {
 652         struct ieee80211_local *local = sdata->local;
 653         int active = 0;
 654         struct sta_info *sta;
 655
 656         sdata_assert_lock(sdata);
 657
 658         rcu_read_lock();
 659
 660         list_for_each_entry_rcu(sta, &local->sta_list, list) {
 661                 unsigned long last_active = ieee80211_sta_last_active(sta);
 662
 663                 if (sta->sdata == sdata &&
 664                     time_is_after_jiffies(last_active +
 665                                           IEEE80211_IBSS_MERGE_INTERVAL)) {
 666                         active++;
 667                         break;
 668                 }
 669         }
 670
 671         rcu_read_unlock();
 672
 673         return active;
 674 }
 675
 676 static void ieee80211_ibss_disconnect(struct ieee80211_sub_if_data *sdata)
 677 {
 678         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 679         struct ieee80211_local *local = sdata->local;
 680         struct cfg80211_bss *cbss;
 681         struct beacon_data *presp;
 682         struct sta_info *sta;
 683
 684         if (!is_zero_ether_addr(ifibss->bssid)) {
 685                 cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->chandef.chan,
 686                                         ifibss->bssid, ifibss->ssid,
 687                                         ifibss->ssid_len,
 688                                         IEEE80211_BSS_TYPE_IBSS,
 689                                         IEEE80211_PRIVACY(ifibss->privacy));
 690
 691                 if (cbss) {
 692                         cfg80211_unlink_bss(local->hw.wiphy, cbss);
 693                         cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
 694                 }
 695         }
 696
 697         ifibss->state = IEEE80211_IBSS_MLME_SEARCH;
 698
 699         sta_info_flush(sdata);
 700
 701         spin_lock_bh(&ifibss->incomplete_lock);
 702         while (!list_empty(&ifibss->incomplete_stations)) {
 703                 sta = list_first_entry(&ifibss->incomplete_stations,
 704                                        struct sta_info, list);
 705                 list_del(&sta->list);
 706                 spin_unlock_bh(&ifibss->incomplete_lock);
 707
 708                 sta_info_free(local, sta);
 709                 spin_lock_bh(&ifibss->incomplete_lock);
 710         }
 711         spin_unlock_bh(&ifibss->incomplete_lock);
 712
 713         netif_carrier_off(sdata->dev);
 714
 715         sdata->vif.bss_conf.ibss_joined = false;
 716         sdata->vif.bss_conf.ibss_creator = false;
 717         sdata->vif.bss_conf.enable_beacon = false;
 718         sdata->vif.bss_conf.ssid_len = 0;
 719
 720         /* remove beacon */
 721         presp = rcu_dereference_protected(ifibss->presp,
 722                                           lockdep_is_held(&sdata->wdev.mtx));
 723         RCU_INIT_POINTER(sdata->u.ibss.presp, NULL);
 724         if (presp)
 725                 kfree_rcu(presp, rcu_head);
 726
 727         clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state);
 728         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED |
 729                                                 BSS_CHANGED_IBSS);
 730         drv_leave_ibss(local, sdata);
 731         mutex_lock(&local->mtx);
 732         ieee80211_vif_release_channel(sdata);
 733         mutex_unlock(&local->mtx);
 734 }
 735
 736 static void ieee80211_csa_connection_drop_work(struct work_struct *work)
 737 {
 738         struct ieee80211_sub_if_data *sdata =
 739                 container_of(work, struct ieee80211_sub_if_data,
 740                              u.ibss.csa_connection_drop_work);
 741
 742         sdata_lock(sdata);
 743
 744         ieee80211_ibss_disconnect(sdata);
 745         synchronize_rcu();
 746         skb_queue_purge(&sdata->skb_queue);
 747
 748         /* trigger a scan to find another IBSS network to join */
 749         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
 750
 751         sdata_unlock(sdata);
 752 }
 753
 754 static void ieee80211_ibss_csa_mark_radar(struct ieee80211_sub_if_data *sdata)
 755 {
 756         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 757         int err;
 758
 759         /* if the current channel is a DFS channel, mark the channel as
 760          * unavailable.
 761          */
 762         err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
 763                                             &ifibss->chandef,
 764                                             NL80211_IFTYPE_ADHOC);
 765         if (err > 0)
 766                 cfg80211_radar_event(sdata->local->hw.wiphy, &ifibss->chandef,
 767                                      GFP_ATOMIC);
 768 }
 769
 770 static bool
 771 ieee80211_ibss_process_chanswitch(struct ieee80211_sub_if_data *sdata,
 772                                   struct ieee802_11_elems *elems,
 773                                   bool beacon)
 774 {
 775         struct cfg80211_csa_settings params;
 776         struct ieee80211_csa_ie csa_ie;
 777         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 778         enum nl80211_channel_type ch_type;
 779         int err;
 780         u32 sta_flags;
 781         u32 vht_cap_info = 0;
 782
 783         sdata_assert_lock(sdata);
 784
 785         sta_flags = IEEE80211_STA_DISABLE_VHT;
 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                 sta_flags |= IEEE80211_STA_DISABLE_HT;
 791                 fallthrough;
 792         case NL80211_CHAN_WIDTH_20:
 793                 sta_flags |= IEEE80211_STA_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                                            sta_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, sta_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         ieee80211_queue_work(&sdata->local->hw,
 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.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.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.supp_rates[band] = supp_rates |
1021                                 ieee80211_mandatory_rates(sband, scan_width);
1022                         if (sta->sta.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.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.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);
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.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, sta);
1076                         if (memcmp(&cap, &sta->sta.vht_cap, sizeof(cap)))
1077                                 rates_updated |= true;
1078                 }
1079
1080                 if (bw != sta->sta.bandwidth)
1081                         rates_updated |= true;
1082
1083                 if (!cfg80211_chandef_compatible(&sdata->u.ibss.chandef,
1084                                                  &chandef))
1085                         WARN_ON_ONCE(1);
1086         }
1087
1088         if (sta && rates_updated) {
1089                 u32 changed = IEEE80211_RC_SUPP_RATES_CHANGED;
1090                 u8 rx_nss = sta->sta.rx_nss;
1091
1092                 /* Force rx_nss recalculation */
1093                 sta->sta.rx_nss = 0;
1094                 rate_control_rate_init(sta);
1095                 if (sta->sta.rx_nss != rx_nss)
1096                         changed |= IEEE80211_RC_NSS_CHANGED;
1097
1098                 drv_sta_rc_update(local, sdata, &sta->sta, changed);
1099         }
1100
1101         rcu_read_unlock();
1102 }
1103
1104 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1105                                   struct ieee80211_mgmt *mgmt, size_t len,
1106                                   struct ieee80211_rx_status *rx_status,
1107                                   struct ieee802_11_elems *elems)
1108 {
1109         struct ieee80211_local *local = sdata->local;
1110         struct cfg80211_bss *cbss;
1111         struct ieee80211_bss *bss;
1112         struct ieee80211_channel *channel;
1113         u64 beacon_timestamp, rx_timestamp;
1114         u32 supp_rates = 0;
1115         enum nl80211_band band = rx_status->band;
1116
1117         channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
1118         if (!channel)
1119                 return;
1120
1121         ieee80211_update_sta_info(sdata, mgmt, len, rx_status, elems, channel);
1122
1123         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, channel);
1124         if (!bss)
1125                 return;
1126
1127         cbss = container_of((void *)bss, struct cfg80211_bss, priv);
1128
1129         /* same for beacon and probe response */
1130         beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp);
1131
1132         /* check if we need to merge IBSS */
1133
1134         /* not an IBSS */
1135         if (!(cbss->capability & WLAN_CAPABILITY_IBSS))
1136                 goto put_bss;
1137
1138         /* different channel */
1139         if (sdata->u.ibss.fixed_channel &&
1140             sdata->u.ibss.chandef.chan != cbss->channel)
1141                 goto put_bss;
1142
1143         /* different SSID */
1144         if (elems->ssid_len != sdata->u.ibss.ssid_len ||
1145             memcmp(elems->ssid, sdata->u.ibss.ssid,
1146                                 sdata->u.ibss.ssid_len))
1147                 goto put_bss;
1148
1149         /* process channel switch */
1150         if (sdata->vif.csa_active ||
1151             ieee80211_ibss_process_chanswitch(sdata, elems, true))
1152                 goto put_bss;
1153
1154         /* same BSSID */
1155         if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid))
1156                 goto put_bss;
1157
1158         /* we use a fixed BSSID */
1159         if (sdata->u.ibss.fixed_bssid)
1160                 goto put_bss;
1161
1162         if (ieee80211_have_rx_timestamp(rx_status)) {
1163                 /* time when timestamp field was received */
1164                 rx_timestamp =
1165                         ieee80211_calculate_rx_timestamp(local, rx_status,
1166                                                          len + FCS_LEN, 24);
1167         } else {
1168                 /*
1169                  * second best option: get current TSF
1170                  * (will return -1 if not supported)
1171                  */
1172                 rx_timestamp = drv_get_tsf(local, sdata);
1173         }
1174
1175         ibss_dbg(sdata, "RX beacon SA=%pM BSSID=%pM TSF=0x%llx\n",
1176                  mgmt->sa, mgmt->bssid,
1177                  (unsigned long long)rx_timestamp);
1178         ibss_dbg(sdata, "\tBCN=0x%llx diff=%lld @%lu\n",
1179                  (unsigned long long)beacon_timestamp,
1180                  (unsigned long long)(rx_timestamp - beacon_timestamp),
1181                  jiffies);
1182
1183         if (beacon_timestamp > rx_timestamp) {
1184                 ibss_dbg(sdata,
1185                          "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n",
1186                          mgmt->bssid);
1187                 ieee80211_sta_join_ibss(sdata, bss);
1188                 supp_rates = ieee80211_sta_get_rates(sdata, elems, band, NULL);
1189                 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa,
1190                                        supp_rates);
1191                 rcu_read_unlock();
1192         }
1193
1194  put_bss:
1195         ieee80211_rx_bss_put(local, bss);
1196 }
1197
1198 void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata,
1199                               const u8 *bssid, const u8 *addr,
1200                               u32 supp_rates)
1201 {
1202         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1203         struct ieee80211_local *local = sdata->local;
1204         struct sta_info *sta;
1205         struct ieee80211_chanctx_conf *chanctx_conf;
1206         struct ieee80211_supported_band *sband;
1207         enum nl80211_bss_scan_width scan_width;
1208         int band;
1209
1210         /*
1211          * XXX: Consider removing the least recently used entry and
1212          *      allow new one to be added.
1213          */
1214         if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
1215                 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
1216                                     sdata->name, addr);
1217                 return;
1218         }
1219
1220         if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH)
1221                 return;
1222
1223         if (!ether_addr_equal(bssid, sdata->u.ibss.bssid))
1224                 return;
1225
1226         rcu_read_lock();
1227         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1228         if (WARN_ON_ONCE(!chanctx_conf)) {
1229                 rcu_read_unlock();
1230                 return;
1231         }
1232         band = chanctx_conf->def.chan->band;
1233         scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
1234         rcu_read_unlock();
1235
1236         sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
1237         if (!sta)
1238                 return;
1239
1240         /* make sure mandatory rates are always added */
1241         sband = local->hw.wiphy->bands[band];
1242         sta->sta.supp_rates[band] = supp_rates |
1243                         ieee80211_mandatory_rates(sband, scan_width);
1244
1245         spin_lock(&ifibss->incomplete_lock);
1246         list_add(&sta->list, &ifibss->incomplete_stations);
1247         spin_unlock(&ifibss->incomplete_lock);
1248         ieee80211_queue_work(&local->hw, &sdata->work);
1249 }
1250
1251 static void ieee80211_ibss_sta_expire(struct ieee80211_sub_if_data *sdata)
1252 {
1253         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1254         struct ieee80211_local *local = sdata->local;
1255         struct sta_info *sta, *tmp;
1256         unsigned long exp_time = IEEE80211_IBSS_INACTIVITY_LIMIT;
1257         unsigned long exp_rsn = IEEE80211_IBSS_RSN_INACTIVITY_LIMIT;
1258
1259         mutex_lock(&local->sta_mtx);
1260
1261         list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
1262                 unsigned long last_active = ieee80211_sta_last_active(sta);
1263
1264                 if (sdata != sta->sdata)
1265                         continue;
1266
1267                 if (time_is_before_jiffies(last_active + exp_time) ||
1268                     (time_is_before_jiffies(last_active + exp_rsn) &&
1269                      sta->sta_state != IEEE80211_STA_AUTHORIZED)) {
1270                         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
1271
1272                         sta_dbg(sta->sdata, "expiring inactive %sSTA %pM\n",
1273                                 sta->sta_state != IEEE80211_STA_AUTHORIZED ?
1274                                 "not authorized " : "", sta->sta.addr);
1275
1276                         ieee80211_send_deauth_disassoc(sdata, sta->sta.addr,
1277                                                        ifibss->bssid,
1278                                                        IEEE80211_STYPE_DEAUTH,
1279                                                        WLAN_REASON_DEAUTH_LEAVING,
1280                                                        true, frame_buf);
1281                         WARN_ON(__sta_info_destroy(sta));
1282                 }
1283         }
1284
1285         mutex_unlock(&local->sta_mtx);
1286 }
1287
1288 /*
1289  * This function is called with state == IEEE80211_IBSS_MLME_JOINED
1290  */
1291
1292 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
1293 {
1294         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1295         enum nl80211_bss_scan_width scan_width;
1296
1297         sdata_assert_lock(sdata);
1298
1299         mod_timer(&ifibss->timer,
1300                   round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
1301
1302         ieee80211_ibss_sta_expire(sdata);
1303
1304         if (time_before(jiffies, ifibss->last_scan_completed +
1305                        IEEE80211_IBSS_MERGE_INTERVAL))
1306                 return;
1307
1308         if (ieee80211_sta_active_ibss(sdata))
1309                 return;
1310
1311         if (ifibss->fixed_channel)
1312                 return;
1313
1314         sdata_info(sdata,
1315                    "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n");
1316
1317         scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
1318         ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len,
1319                                     NULL, 0, scan_width);
1320 }
1321
1322 static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
1323 {
1324         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1325         u8 bssid[ETH_ALEN];
1326         u16 capability;
1327         int i;
1328
1329         sdata_assert_lock(sdata);
1330
1331         if (ifibss->fixed_bssid) {
1332                 memcpy(bssid, ifibss->bssid, ETH_ALEN);
1333         } else {
1334                 /* Generate random, not broadcast, locally administered BSSID. Mix in
1335                  * own MAC address to make sure that devices that do not have proper
1336                  * random number generator get different BSSID. */
1337                 get_random_bytes(bssid, ETH_ALEN);
1338                 for (i = 0; i < ETH_ALEN; i++)
1339                         bssid[i] ^= sdata->vif.addr[i];
1340                 bssid[0] &= ~0x01;
1341                 bssid[0] |= 0x02;
1342         }
1343
1344         sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid);
1345
1346         capability = WLAN_CAPABILITY_IBSS;
1347
1348         if (ifibss->privacy)
1349                 capability |= WLAN_CAPABILITY_PRIVACY;
1350
1351         __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int,
1352                                   &ifibss->chandef, ifibss->basic_rates,
1353                                   capability, 0, true);
1354 }
1355
1356 static unsigned ibss_setup_channels(struct wiphy *wiphy,
1357                                     struct ieee80211_channel **channels,
1358                                     unsigned int channels_max,
1359                                     u32 center_freq, u32 width)
1360 {
1361         struct ieee80211_channel *chan = NULL;
1362         unsigned int n_chan = 0;
1363         u32 start_freq, end_freq, freq;
1364
1365         if (width <= 20) {
1366                 start_freq = center_freq;
1367                 end_freq = center_freq;
1368         } else {
1369                 start_freq = center_freq - width / 2 + 10;
1370                 end_freq = center_freq + width / 2 - 10;
1371         }
1372
1373         for (freq = start_freq; freq <= end_freq; freq += 20) {
1374                 chan = ieee80211_get_channel(wiphy, freq);
1375                 if (!chan)
1376                         continue;
1377                 if (n_chan >= channels_max)
1378                         return n_chan;
1379
1380                 channels[n_chan] = chan;
1381                 n_chan++;
1382         }
1383
1384         return n_chan;
1385 }
1386
1387 static unsigned int
1388 ieee80211_ibss_setup_scan_channels(struct wiphy *wiphy,
1389                                    const struct cfg80211_chan_def *chandef,
1390                                    struct ieee80211_channel **channels,
1391                                    unsigned int channels_max)
1392 {
1393         unsigned int n_chan = 0;
1394         u32 width, cf1, cf2 = 0;
1395
1396         switch (chandef->width) {
1397         case NL80211_CHAN_WIDTH_40:
1398                 width = 40;
1399                 break;
1400         case NL80211_CHAN_WIDTH_80P80:
1401                 cf2 = chandef->center_freq2;
1402                 fallthrough;
1403         case NL80211_CHAN_WIDTH_80:
1404                 width = 80;
1405                 break;
1406         case NL80211_CHAN_WIDTH_160:
1407                 width = 160;
1408                 break;
1409         default:
1410                 width = 20;
1411                 break;
1412         }
1413
1414         cf1 = chandef->center_freq1;
1415
1416         n_chan = ibss_setup_channels(wiphy, channels, channels_max, cf1, width);
1417
1418         if (cf2)
1419                 n_chan += ibss_setup_channels(wiphy, &channels[n_chan],
1420                                               channels_max - n_chan, cf2,
1421                                               width);
1422
1423         return n_chan;
1424 }
1425
1426 /*
1427  * This function is called with state == IEEE80211_IBSS_MLME_SEARCH
1428  */
1429
1430 static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
1431 {
1432         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1433         struct ieee80211_local *local = sdata->local;
1434         struct cfg80211_bss *cbss;
1435         struct ieee80211_channel *chan = NULL;
1436         const u8 *bssid = NULL;
1437         enum nl80211_bss_scan_width scan_width;
1438         int active_ibss;
1439
1440         sdata_assert_lock(sdata);
1441
1442         active_ibss = ieee80211_sta_active_ibss(sdata);
1443         ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss);
1444
1445         if (active_ibss)
1446                 return;
1447
1448         if (ifibss->fixed_bssid)
1449                 bssid = ifibss->bssid;
1450         if (ifibss->fixed_channel)
1451                 chan = ifibss->chandef.chan;
1452         if (!is_zero_ether_addr(ifibss->bssid))
1453                 bssid = ifibss->bssid;
1454         cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid,
1455                                 ifibss->ssid, ifibss->ssid_len,
1456                                 IEEE80211_BSS_TYPE_IBSS,
1457                                 IEEE80211_PRIVACY(ifibss->privacy));
1458
1459         if (cbss) {
1460                 struct ieee80211_bss *bss;
1461
1462                 bss = (void *)cbss->priv;
1463                 ibss_dbg(sdata,
1464                          "sta_find_ibss: selected %pM current %pM\n",
1465                          cbss->bssid, ifibss->bssid);
1466                 sdata_info(sdata,
1467                            "Selected IBSS BSSID %pM based on configured SSID\n",
1468                            cbss->bssid);
1469
1470                 ieee80211_sta_join_ibss(sdata, bss);
1471                 ieee80211_rx_bss_put(local, bss);
1472                 return;
1473         }
1474
1475         /* if a fixed bssid and a fixed freq have been provided create the IBSS
1476          * directly and do not waste time scanning
1477          */
1478         if (ifibss->fixed_bssid && ifibss->fixed_channel) {
1479                 sdata_info(sdata, "Created IBSS using preconfigured BSSID %pM\n",
1480                            bssid);
1481                 ieee80211_sta_create_ibss(sdata);
1482                 return;
1483         }
1484
1485
1486         ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n");
1487
1488         /* Selected IBSS not found in current scan results - try to scan */
1489         if (time_after(jiffies, ifibss->last_scan_completed +
1490                                         IEEE80211_SCAN_INTERVAL)) {
1491                 struct ieee80211_channel *channels[8];
1492                 unsigned int num;
1493
1494                 sdata_info(sdata, "Trigger new scan to find an IBSS to join\n");
1495
1496                 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
1497
1498                 if (ifibss->fixed_channel) {
1499                         num = ieee80211_ibss_setup_scan_channels(local->hw.wiphy,
1500                                                                  &ifibss->chandef,
1501                                                                  channels,
1502                                                                  ARRAY_SIZE(channels));
1503                         ieee80211_request_ibss_scan(sdata, ifibss->ssid,
1504                                                     ifibss->ssid_len, channels,
1505                                                     num, scan_width);
1506                 } else {
1507                         ieee80211_request_ibss_scan(sdata, ifibss->ssid,
1508                                                     ifibss->ssid_len, NULL,
1509                                                     0, scan_width);
1510                 }
1511         } else {
1512                 int interval = IEEE80211_SCAN_INTERVAL;
1513
1514                 if (time_after(jiffies, ifibss->ibss_join_req +
1515                                IEEE80211_IBSS_JOIN_TIMEOUT))
1516                         ieee80211_sta_create_ibss(sdata);
1517
1518                 mod_timer(&ifibss->timer,
1519                           round_jiffies(jiffies + interval));
1520         }
1521 }
1522
1523 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
1524                                         struct sk_buff *req)
1525 {
1526         struct ieee80211_mgmt *mgmt = (void *)req->data;
1527         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1528         struct ieee80211_local *local = sdata->local;
1529         int tx_last_beacon, len = req->len;
1530         struct sk_buff *skb;
1531         struct beacon_data *presp;
1532         u8 *pos, *end;
1533
1534         sdata_assert_lock(sdata);
1535
1536         presp = rcu_dereference_protected(ifibss->presp,
1537                                           lockdep_is_held(&sdata->wdev.mtx));
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         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1610                                false, &elems, mgmt->bssid, NULL);
1611
1612         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
1613 }
1614
1615 void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1616                                    struct sk_buff *skb)
1617 {
1618         struct ieee80211_rx_status *rx_status;
1619         struct ieee80211_mgmt *mgmt;
1620         u16 fc;
1621         struct ieee802_11_elems elems;
1622         int ies_len;
1623
1624         rx_status = IEEE80211_SKB_RXCB(skb);
1625         mgmt = (struct ieee80211_mgmt *) skb->data;
1626         fc = le16_to_cpu(mgmt->frame_control);
1627
1628         sdata_lock(sdata);
1629
1630         if (!sdata->u.ibss.ssid_len)
1631                 goto mgmt_out; /* not ready to merge yet */
1632
1633         switch (fc & IEEE80211_FCTL_STYPE) {
1634         case IEEE80211_STYPE_PROBE_REQ:
1635                 ieee80211_rx_mgmt_probe_req(sdata, skb);
1636                 break;
1637         case IEEE80211_STYPE_PROBE_RESP:
1638         case IEEE80211_STYPE_BEACON:
1639                 ieee80211_rx_mgmt_probe_beacon(sdata, mgmt, skb->len,
1640                                                rx_status);
1641                 break;
1642         case IEEE80211_STYPE_AUTH:
1643                 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len);
1644                 break;
1645         case IEEE80211_STYPE_DEAUTH:
1646                 ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len);
1647                 break;
1648         case IEEE80211_STYPE_ACTION:
1649                 switch (mgmt->u.action.category) {
1650                 case WLAN_CATEGORY_SPECTRUM_MGMT:
1651                         ies_len = skb->len -
1652                                   offsetof(struct ieee80211_mgmt,
1653                                            u.action.u.chan_switch.variable);
1654
1655                         if (ies_len < 0)
1656                                 break;
1657
1658                         ieee802_11_parse_elems(
1659                                 mgmt->u.action.u.chan_switch.variable,
1660                                 ies_len, true, &elems, mgmt->bssid, NULL);
1661
1662                         if (elems.parse_error)
1663                                 break;
1664
1665                         ieee80211_rx_mgmt_spectrum_mgmt(sdata, mgmt, skb->len,
1666                                                         rx_status, &elems);
1667                         break;
1668                 }
1669         }
1670
1671  mgmt_out:
1672         sdata_unlock(sdata);
1673 }
1674
1675 void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata)
1676 {
1677         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1678         struct sta_info *sta;
1679
1680         sdata_lock(sdata);
1681
1682         /*
1683          * Work could be scheduled after scan or similar
1684          * when we aren't even joined (or trying) with a
1685          * network.
1686          */
1687         if (!ifibss->ssid_len)
1688                 goto out;
1689
1690         spin_lock_bh(&ifibss->incomplete_lock);
1691         while (!list_empty(&ifibss->incomplete_stations)) {
1692                 sta = list_first_entry(&ifibss->incomplete_stations,
1693                                        struct sta_info, list);
1694                 list_del(&sta->list);
1695                 spin_unlock_bh(&ifibss->incomplete_lock);
1696
1697                 ieee80211_ibss_finish_sta(sta);
1698                 rcu_read_unlock();
1699                 spin_lock_bh(&ifibss->incomplete_lock);
1700         }
1701         spin_unlock_bh(&ifibss->incomplete_lock);
1702
1703         switch (ifibss->state) {
1704         case IEEE80211_IBSS_MLME_SEARCH:
1705                 ieee80211_sta_find_ibss(sdata);
1706                 break;
1707         case IEEE80211_IBSS_MLME_JOINED:
1708                 ieee80211_sta_merge_ibss(sdata);
1709                 break;
1710         default:
1711                 WARN_ON(1);
1712                 break;
1713         }
1714
1715  out:
1716         sdata_unlock(sdata);
1717 }
1718
1719 static void ieee80211_ibss_timer(struct timer_list *t)
1720 {
1721         struct ieee80211_sub_if_data *sdata =
1722                 from_timer(sdata, t, u.ibss.timer);
1723
1724         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1725 }
1726
1727 void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata)
1728 {
1729         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1730
1731         timer_setup(&ifibss->timer, ieee80211_ibss_timer, 0);
1732         INIT_LIST_HEAD(&ifibss->incomplete_stations);
1733         spin_lock_init(&ifibss->incomplete_lock);
1734         INIT_WORK(&ifibss->csa_connection_drop_work,
1735                   ieee80211_csa_connection_drop_work);
1736 }
1737
1738 /* scan finished notification */
1739 void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local)
1740 {
1741         struct ieee80211_sub_if_data *sdata;
1742
1743         mutex_lock(&local->iflist_mtx);
1744         list_for_each_entry(sdata, &local->interfaces, list) {
1745                 if (!ieee80211_sdata_running(sdata))
1746                         continue;
1747                 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
1748                         continue;
1749                 sdata->u.ibss.last_scan_completed = jiffies;
1750         }
1751         mutex_unlock(&local->iflist_mtx);
1752 }
1753
1754 int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
1755                         struct cfg80211_ibss_params *params)
1756 {
1757         u32 changed = 0;
1758         u32 rate_flags;
1759         struct ieee80211_supported_band *sband;
1760         enum ieee80211_chanctx_mode chanmode;
1761         struct ieee80211_local *local = sdata->local;
1762         int radar_detect_width = 0;
1763         int i;
1764         int ret;
1765
1766         if (params->chandef.chan->freq_offset) {
1767                 /* this may work, but is untested */
1768                 return -EOPNOTSUPP;
1769         }
1770
1771         ret = cfg80211_chandef_dfs_required(local->hw.wiphy,
1772                                             &params->chandef,
1773                                             sdata->wdev.iftype);
1774         if (ret < 0)
1775                 return ret;
1776
1777         if (ret > 0) {
1778                 if (!params->userspace_handles_dfs)
1779                         return -EINVAL;
1780                 radar_detect_width = BIT(params->chandef.width);
1781         }
1782
1783         chanmode = (params->channel_fixed && !ret) ?
1784                 IEEE80211_CHANCTX_SHARED : IEEE80211_CHANCTX_EXCLUSIVE;
1785
1786         mutex_lock(&local->chanctx_mtx);
1787         ret = ieee80211_check_combinations(sdata, &params->chandef, chanmode,
1788                                            radar_detect_width);
1789         mutex_unlock(&local->chanctx_mtx);
1790         if (ret < 0)
1791                 return ret;
1792
1793         if (params->bssid) {
1794                 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN);
1795                 sdata->u.ibss.fixed_bssid = true;
1796         } else
1797                 sdata->u.ibss.fixed_bssid = false;
1798
1799         sdata->u.ibss.privacy = params->privacy;
1800         sdata->u.ibss.control_port = params->control_port;
1801         sdata->u.ibss.userspace_handles_dfs = params->userspace_handles_dfs;
1802         sdata->u.ibss.basic_rates = params->basic_rates;
1803         sdata->u.ibss.last_scan_completed = jiffies;
1804
1805         /* fix basic_rates if channel does not support these rates */
1806         rate_flags = ieee80211_chandef_rate_flags(&params->chandef);
1807         sband = local->hw.wiphy->bands[params->chandef.chan->band];
1808         for (i = 0; i < sband->n_bitrates; i++) {
1809                 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
1810                         sdata->u.ibss.basic_rates &= ~BIT(i);
1811         }
1812         memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate,
1813                sizeof(params->mcast_rate));
1814
1815         sdata->vif.bss_conf.beacon_int = params->beacon_interval;
1816
1817         sdata->u.ibss.chandef = params->chandef;
1818         sdata->u.ibss.fixed_channel = params->channel_fixed;
1819
1820         if (params->ie) {
1821                 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len,
1822                                            GFP_KERNEL);
1823                 if (sdata->u.ibss.ie)
1824                         sdata->u.ibss.ie_len = params->ie_len;
1825         }
1826
1827         sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
1828         sdata->u.ibss.ibss_join_req = jiffies;
1829
1830         memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len);
1831         sdata->u.ibss.ssid_len = params->ssid_len;
1832
1833         memcpy(&sdata->u.ibss.ht_capa, &params->ht_capa,
1834                sizeof(sdata->u.ibss.ht_capa));
1835         memcpy(&sdata->u.ibss.ht_capa_mask, &params->ht_capa_mask,
1836                sizeof(sdata->u.ibss.ht_capa_mask));
1837
1838         /*
1839          * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is
1840          * reserved, but an HT STA shall protect HT transmissions as though
1841          * the HT Protection field were set to non-HT mixed mode.
1842          *
1843          * In an IBSS, the RIFS Mode field of the HT Operation element is
1844          * also reserved, but an HT STA shall operate as though this field
1845          * were set to 1.
1846          */
1847
1848         sdata->vif.bss_conf.ht_operation_mode |=
1849                   IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED
1850                 | IEEE80211_HT_PARAM_RIFS_MODE;
1851
1852         changed |= BSS_CHANGED_HT | BSS_CHANGED_MCAST_RATE;
1853         ieee80211_bss_info_change_notify(sdata, changed);
1854
1855         sdata->smps_mode = IEEE80211_SMPS_OFF;
1856         sdata->needed_rx_chains = local->rx_chains;
1857         sdata->control_port_over_nl80211 = params->control_port_over_nl80211;
1858
1859         ieee80211_queue_work(&local->hw, &sdata->work);
1860
1861         return 0;
1862 }
1863
1864 int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata)
1865 {
1866         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1867
1868         ieee80211_ibss_disconnect(sdata);
1869         ifibss->ssid_len = 0;
1870         eth_zero_addr(ifibss->bssid);
1871
1872         /* remove beacon */
1873         kfree(sdata->u.ibss.ie);
1874         sdata->u.ibss.ie = NULL;
1875         sdata->u.ibss.ie_len = 0;
1876
1877         /* on the next join, re-program HT parameters */
1878         memset(&ifibss->ht_capa, 0, sizeof(ifibss->ht_capa));
1879         memset(&ifibss->ht_capa_mask, 0, sizeof(ifibss->ht_capa_mask));
1880
1881         synchronize_rcu();
1882
1883         skb_queue_purge(&sdata->skb_queue);
1884
1885         del_timer_sync(&sdata->u.ibss.timer);
1886
1887         return 0;
1888 }