linux/net/mac80211/ibss.c
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   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) 2018-2021 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
  37static struct beacon_data *
  38ieee80211_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;
 213error:
 214        kfree(presp);
 215        return NULL;
 216}
 217
 218static 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
 397static 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
 483int 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
 530int 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        /* update cfg80211 bss information with the new channel */
 538        if (!is_zero_ether_addr(ifibss->bssid)) {
 539                cbss = cfg80211_get_bss(sdata->local->hw.wiphy,
 540                                        ifibss->chandef.chan,
 541                                        ifibss->bssid, ifibss->ssid,
 542                                        ifibss->ssid_len,
 543                                        IEEE80211_BSS_TYPE_IBSS,
 544                                        IEEE80211_PRIVACY(ifibss->privacy));
 545                /* XXX: should not really modify cfg80211 data */
 546                if (cbss) {
 547                        cbss->channel = sdata->csa_chandef.chan;
 548                        cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
 549                }
 550        }
 551
 552        ifibss->chandef = sdata->csa_chandef;
 553
 554        /* generate the beacon */
 555        return ieee80211_ibss_csa_beacon(sdata, NULL);
 556}
 557
 558void ieee80211_ibss_stop(struct ieee80211_sub_if_data *sdata)
 559{
 560        struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 561
 562        cancel_work_sync(&ifibss->csa_connection_drop_work);
 563}
 564
 565static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta)
 566        __acquires(RCU)
 567{
 568        struct ieee80211_sub_if_data *sdata = sta->sdata;
 569        u8 addr[ETH_ALEN];
 570
 571        memcpy(addr, sta->sta.addr, ETH_ALEN);
 572
 573        ibss_dbg(sdata, "Adding new IBSS station %pM\n", addr);
 574
 575        sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
 576        sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
 577        /* authorize the station only if the network is not RSN protected. If
 578         * not wait for the userspace to authorize it */
 579        if (!sta->sdata->u.ibss.control_port)
 580                sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
 581
 582        rate_control_rate_init(sta);
 583
 584        /* If it fails, maybe we raced another insertion? */
 585        if (sta_info_insert_rcu(sta))
 586                return sta_info_get(sdata, addr);
 587        return sta;
 588}
 589
 590static struct sta_info *
 591ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, const u8 *bssid,
 592                       const u8 *addr, u32 supp_rates)
 593        __acquires(RCU)
 594{
 595        struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 596        struct ieee80211_local *local = sdata->local;
 597        struct sta_info *sta;
 598        struct ieee80211_chanctx_conf *chanctx_conf;
 599        struct ieee80211_supported_band *sband;
 600        enum nl80211_bss_scan_width scan_width;
 601        int band;
 602
 603        /*
 604         * XXX: Consider removing the least recently used entry and
 605         *      allow new one to be added.
 606         */
 607        if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
 608                net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
 609                                    sdata->name, addr);
 610                rcu_read_lock();
 611                return NULL;
 612        }
 613
 614        if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) {
 615                rcu_read_lock();
 616                return NULL;
 617        }
 618
 619        if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) {
 620                rcu_read_lock();
 621                return NULL;
 622        }
 623
 624        rcu_read_lock();
 625        chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 626        if (WARN_ON_ONCE(!chanctx_conf))
 627                return NULL;
 628        band = chanctx_conf->def.chan->band;
 629        scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
 630        rcu_read_unlock();
 631
 632        sta = sta_info_alloc(sdata, addr, GFP_KERNEL);
 633        if (!sta) {
 634                rcu_read_lock();
 635                return NULL;
 636        }
 637
 638        /* make sure mandatory rates are always added */
 639        sband = local->hw.wiphy->bands[band];
 640        sta->sta.supp_rates[band] = supp_rates |
 641                        ieee80211_mandatory_rates(sband, scan_width);
 642
 643        return ieee80211_ibss_finish_sta(sta);
 644}
 645
 646static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
 647{
 648        struct ieee80211_local *local = sdata->local;
 649        int active = 0;
 650        struct sta_info *sta;
 651
 652        sdata_assert_lock(sdata);
 653
 654        rcu_read_lock();
 655
 656        list_for_each_entry_rcu(sta, &local->sta_list, list) {
 657                unsigned long last_active = ieee80211_sta_last_active(sta);
 658
 659                if (sta->sdata == sdata &&
 660                    time_is_after_jiffies(last_active +
 661                                          IEEE80211_IBSS_MERGE_INTERVAL)) {
 662                        active++;
 663                        break;
 664                }
 665        }
 666
 667        rcu_read_unlock();
 668
 669        return active;
 670}
 671
 672static void ieee80211_ibss_disconnect(struct ieee80211_sub_if_data *sdata)
 673{
 674        struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 675        struct ieee80211_local *local = sdata->local;
 676        struct cfg80211_bss *cbss;
 677        struct beacon_data *presp;
 678        struct sta_info *sta;
 679
 680        if (!is_zero_ether_addr(ifibss->bssid)) {
 681                cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->chandef.chan,
 682                                        ifibss->bssid, ifibss->ssid,
 683                                        ifibss->ssid_len,
 684                                        IEEE80211_BSS_TYPE_IBSS,
 685                                        IEEE80211_PRIVACY(ifibss->privacy));
 686
 687                if (cbss) {
 688                        cfg80211_unlink_bss(local->hw.wiphy, cbss);
 689                        cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
 690                }
 691        }
 692
 693        ifibss->state = IEEE80211_IBSS_MLME_SEARCH;
 694
 695        sta_info_flush(sdata);
 696
 697        spin_lock_bh(&ifibss->incomplete_lock);
 698        while (!list_empty(&ifibss->incomplete_stations)) {
 699                sta = list_first_entry(&ifibss->incomplete_stations,
 700                                       struct sta_info, list);
 701                list_del(&sta->list);
 702                spin_unlock_bh(&ifibss->incomplete_lock);
 703
 704                sta_info_free(local, sta);
 705                spin_lock_bh(&ifibss->incomplete_lock);
 706        }
 707        spin_unlock_bh(&ifibss->incomplete_lock);
 708
 709        netif_carrier_off(sdata->dev);
 710
 711        sdata->vif.bss_conf.ibss_joined = false;
 712        sdata->vif.bss_conf.ibss_creator = false;
 713        sdata->vif.bss_conf.enable_beacon = false;
 714        sdata->vif.bss_conf.ssid_len = 0;
 715
 716        /* remove beacon */
 717        presp = rcu_dereference_protected(ifibss->presp,
 718                                          lockdep_is_held(&sdata->wdev.mtx));
 719        RCU_INIT_POINTER(sdata->u.ibss.presp, NULL);
 720        if (presp)
 721                kfree_rcu(presp, rcu_head);
 722
 723        clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state);
 724        ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED |
 725                                                BSS_CHANGED_IBSS);
 726        drv_leave_ibss(local, sdata);
 727        mutex_lock(&local->mtx);
 728        ieee80211_vif_release_channel(sdata);
 729        mutex_unlock(&local->mtx);
 730}
 731
 732static void ieee80211_csa_connection_drop_work(struct work_struct *work)
 733{
 734        struct ieee80211_sub_if_data *sdata =
 735                container_of(work, struct ieee80211_sub_if_data,
 736                             u.ibss.csa_connection_drop_work);
 737
 738        sdata_lock(sdata);
 739
 740        ieee80211_ibss_disconnect(sdata);
 741        synchronize_rcu();
 742        skb_queue_purge(&sdata->skb_queue);
 743
 744        /* trigger a scan to find another IBSS network to join */
 745        ieee80211_queue_work(&sdata->local->hw, &sdata->work);
 746
 747        sdata_unlock(sdata);
 748}
 749
 750static void ieee80211_ibss_csa_mark_radar(struct ieee80211_sub_if_data *sdata)
 751{
 752        struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 753        int err;
 754
 755        /* if the current channel is a DFS channel, mark the channel as
 756         * unavailable.
 757         */
 758        err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
 759                                            &ifibss->chandef,
 760                                            NL80211_IFTYPE_ADHOC);
 761        if (err > 0)
 762                cfg80211_radar_event(sdata->local->hw.wiphy, &ifibss->chandef,
 763                                     GFP_ATOMIC);
 764}
 765
 766static bool
 767ieee80211_ibss_process_chanswitch(struct ieee80211_sub_if_data *sdata,
 768                                  struct ieee802_11_elems *elems,
 769                                  bool beacon)
 770{
 771        struct cfg80211_csa_settings params;
 772        struct ieee80211_csa_ie csa_ie;
 773        struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 774        enum nl80211_channel_type ch_type;
 775        int err;
 776        u32 sta_flags;
 777        u32 vht_cap_info = 0;
 778
 779        sdata_assert_lock(sdata);
 780
 781        sta_flags = IEEE80211_STA_DISABLE_VHT;
 782        switch (ifibss->chandef.width) {
 783        case NL80211_CHAN_WIDTH_5:
 784        case NL80211_CHAN_WIDTH_10:
 785        case NL80211_CHAN_WIDTH_20_NOHT:
 786                sta_flags |= IEEE80211_STA_DISABLE_HT;
 787                fallthrough;
 788        case NL80211_CHAN_WIDTH_20:
 789                sta_flags |= IEEE80211_STA_DISABLE_40MHZ;
 790                break;
 791        default:
 792                break;
 793        }
 794
 795        if (elems->vht_cap_elem)
 796                vht_cap_info = le32_to_cpu(elems->vht_cap_elem->vht_cap_info);
 797
 798        memset(&params, 0, sizeof(params));
 799        err = ieee80211_parse_ch_switch_ie(sdata, elems,
 800                                           ifibss->chandef.chan->band,
 801                                           vht_cap_info,
 802                                           sta_flags, ifibss->bssid, &csa_ie);
 803        /* can't switch to destination channel, fail */
 804        if (err < 0)
 805                goto disconnect;
 806
 807        /* did not contain a CSA */
 808        if (err)
 809                return false;
 810
 811        /* channel switch is not supported, disconnect */
 812        if (!(sdata->local->hw.wiphy->flags & WIPHY_FLAG_HAS_CHANNEL_SWITCH))
 813                goto disconnect;
 814
 815        params.count = csa_ie.count;
 816        params.chandef = csa_ie.chandef;
 817
 818        switch (ifibss->chandef.width) {
 819        case NL80211_CHAN_WIDTH_20_NOHT:
 820        case NL80211_CHAN_WIDTH_20:
 821        case NL80211_CHAN_WIDTH_40:
 822                /* keep our current HT mode (HT20/HT40+/HT40-), even if
 823                 * another mode  has been announced. The mode is not adopted
 824                 * within the beacon while doing CSA and we should therefore
 825                 * keep the mode which we announce.
 826                 */
 827                ch_type = cfg80211_get_chandef_type(&ifibss->chandef);
 828                cfg80211_chandef_create(&params.chandef, params.chandef.chan,
 829                                        ch_type);
 830                break;
 831        case NL80211_CHAN_WIDTH_5:
 832        case NL80211_CHAN_WIDTH_10:
 833                if (params.chandef.width != ifibss->chandef.width) {
 834                        sdata_info(sdata,
 835                                   "IBSS %pM received channel switch from incompatible channel width (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
 836                                   ifibss->bssid,
 837                                   params.chandef.chan->center_freq,
 838                                   params.chandef.width,
 839                                   params.chandef.center_freq1,
 840                                   params.chandef.center_freq2);
 841                        goto disconnect;
 842                }
 843                break;
 844        default:
 845                /* should not happen, sta_flags should prevent VHT modes. */
 846                WARN_ON(1);
 847                goto disconnect;
 848        }
 849
 850        if (!cfg80211_reg_can_beacon(sdata->local->hw.wiphy, &params.chandef,
 851                                     NL80211_IFTYPE_ADHOC)) {
 852                sdata_info(sdata,
 853                           "IBSS %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
 854                           ifibss->bssid,
 855                           params.chandef.chan->center_freq,
 856                           params.chandef.width,
 857                           params.chandef.center_freq1,
 858                           params.chandef.center_freq2);
 859                goto disconnect;
 860        }
 861
 862        err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
 863                                            &params.chandef,
 864                                            NL80211_IFTYPE_ADHOC);
 865        if (err < 0)
 866                goto disconnect;
 867        if (err > 0 && !ifibss->userspace_handles_dfs) {
 868                /* IBSS-DFS only allowed with a control program */
 869                goto disconnect;
 870        }
 871
 872        params.radar_required = err;
 873
 874        if (cfg80211_chandef_identical(&params.chandef,
 875                                       &sdata->vif.bss_conf.chandef)) {
 876                ibss_dbg(sdata,
 877                         "received csa with an identical chandef, ignoring\n");
 878                return true;
 879        }
 880
 881        /* all checks done, now perform the channel switch. */
 882        ibss_dbg(sdata,
 883                 "received channel switch announcement to go to channel %d MHz\n",
 884                 params.chandef.chan->center_freq);
 885
 886        params.block_tx = !!csa_ie.mode;
 887
 888        if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev,
 889                                     &params))
 890                goto disconnect;
 891
 892        ieee80211_ibss_csa_mark_radar(sdata);
 893
 894        return true;
 895disconnect:
 896        ibss_dbg(sdata, "Can't handle channel switch, disconnect\n");
 897        ieee80211_queue_work(&sdata->local->hw,
 898                             &ifibss->csa_connection_drop_work);
 899
 900        ieee80211_ibss_csa_mark_radar(sdata);
 901
 902        return true;
 903}
 904
 905static void
 906ieee80211_rx_mgmt_spectrum_mgmt(struct ieee80211_sub_if_data *sdata,
 907                                struct ieee80211_mgmt *mgmt, size_t len,
 908                                struct ieee80211_rx_status *rx_status,
 909                                struct ieee802_11_elems *elems)
 910{
 911        int required_len;
 912
 913        if (len < IEEE80211_MIN_ACTION_SIZE + 1)
 914                return;
 915
 916        /* CSA is the only action we handle for now */
 917        if (mgmt->u.action.u.measurement.action_code !=
 918            WLAN_ACTION_SPCT_CHL_SWITCH)
 919                return;
 920
 921        required_len = IEEE80211_MIN_ACTION_SIZE +
 922                       sizeof(mgmt->u.action.u.chan_switch);
 923        if (len < required_len)
 924                return;
 925
 926        if (!sdata->vif.csa_active)
 927                ieee80211_ibss_process_chanswitch(sdata, elems, false);
 928}
 929
 930static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data *sdata,
 931                                          struct ieee80211_mgmt *mgmt,
 932                                          size_t len)
 933{
 934        u16 reason = le16_to_cpu(mgmt->u.deauth.reason_code);
 935
 936        if (len < IEEE80211_DEAUTH_FRAME_LEN)
 937                return;
 938
 939        ibss_dbg(sdata, "RX DeAuth SA=%pM DA=%pM\n", mgmt->sa, mgmt->da);
 940        ibss_dbg(sdata, "\tBSSID=%pM (reason: %d)\n", mgmt->bssid, reason);
 941        sta_info_destroy_addr(sdata, mgmt->sa);
 942}
 943
 944static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata,
 945                                        struct ieee80211_mgmt *mgmt,
 946                                        size_t len)
 947{
 948        u16 auth_alg, auth_transaction;
 949
 950        sdata_assert_lock(sdata);
 951
 952        if (len < 24 + 6)
 953                return;
 954
 955        auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
 956        auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
 957
 958        ibss_dbg(sdata, "RX Auth SA=%pM DA=%pM\n", mgmt->sa, mgmt->da);
 959        ibss_dbg(sdata, "\tBSSID=%pM (auth_transaction=%d)\n",
 960                 mgmt->bssid, auth_transaction);
 961
 962        if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
 963                return;
 964
 965        /*
 966         * IEEE 802.11 standard does not require authentication in IBSS
 967         * networks and most implementations do not seem to use it.
 968         * However, try to reply to authentication attempts if someone
 969         * has actually implemented this.
 970         */
 971        ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, 0, NULL, 0,
 972                            mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0, 0);
 973}
 974
 975static void ieee80211_update_sta_info(struct ieee80211_sub_if_data *sdata,
 976                                      struct ieee80211_mgmt *mgmt, size_t len,
 977                                      struct ieee80211_rx_status *rx_status,
 978                                      struct ieee802_11_elems *elems,
 979                                      struct ieee80211_channel *channel)
 980{
 981        struct sta_info *sta;
 982        enum nl80211_band band = rx_status->band;
 983        enum nl80211_bss_scan_width scan_width;
 984        struct ieee80211_local *local = sdata->local;
 985        struct ieee80211_supported_band *sband;
 986        bool rates_updated = false;
 987        u32 supp_rates = 0;
 988
 989        if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
 990                return;
 991
 992        if (!ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid))
 993                return;
 994
 995        sband = local->hw.wiphy->bands[band];
 996        if (WARN_ON(!sband))
 997                return;
 998
 999        rcu_read_lock();
1000        sta = sta_info_get(sdata, mgmt->sa);
1001
1002        if (elems->supp_rates) {
1003                supp_rates = ieee80211_sta_get_rates(sdata, elems,
1004                                                     band, NULL);
1005                if (sta) {
1006                        u32 prev_rates;
1007
1008                        prev_rates = sta->sta.supp_rates[band];
1009                        /* make sure mandatory rates are always added */
1010                        scan_width = NL80211_BSS_CHAN_WIDTH_20;
1011                        if (rx_status->bw == RATE_INFO_BW_5)
1012                                scan_width = NL80211_BSS_CHAN_WIDTH_5;
1013                        else if (rx_status->bw == RATE_INFO_BW_10)
1014                                scan_width = NL80211_BSS_CHAN_WIDTH_10;
1015
1016                        sta->sta.supp_rates[band] = supp_rates |
1017                                ieee80211_mandatory_rates(sband, scan_width);
1018                        if (sta->sta.supp_rates[band] != prev_rates) {
1019                                ibss_dbg(sdata,
1020                                         "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n",
1021                                         sta->sta.addr, prev_rates,
1022                                         sta->sta.supp_rates[band]);
1023                                rates_updated = true;
1024                        }
1025                } else {
1026                        rcu_read_unlock();
1027                        sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid,
1028                                                     mgmt->sa, supp_rates);
1029                }
1030        }
1031
1032        if (sta && !sta->sta.wme &&
1033            (elems->wmm_info || elems->s1g_capab) &&
1034            local->hw.queues >= IEEE80211_NUM_ACS) {
1035                sta->sta.wme = true;
1036                ieee80211_check_fast_xmit(sta);
1037        }
1038
1039        if (sta && elems->ht_operation && elems->ht_cap_elem &&
1040            sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20_NOHT &&
1041            sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_5 &&
1042            sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_10) {
1043                /* we both use HT */
1044                struct ieee80211_ht_cap htcap_ie;
1045                struct cfg80211_chan_def chandef;
1046                enum ieee80211_sta_rx_bandwidth bw = sta->sta.bandwidth;
1047
1048                cfg80211_chandef_create(&chandef, channel, NL80211_CHAN_NO_HT);
1049                ieee80211_chandef_ht_oper(elems->ht_operation, &chandef);
1050
1051                memcpy(&htcap_ie, elems->ht_cap_elem, sizeof(htcap_ie));
1052                rates_updated |= ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
1053                                                                   &htcap_ie,
1054                                                                   sta);
1055
1056                if (elems->vht_operation && elems->vht_cap_elem &&
1057                    sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20 &&
1058                    sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_40) {
1059                        /* we both use VHT */
1060                        struct ieee80211_vht_cap cap_ie;
1061                        struct ieee80211_sta_vht_cap cap = sta->sta.vht_cap;
1062                        u32 vht_cap_info =
1063                                le32_to_cpu(elems->vht_cap_elem->vht_cap_info);
1064
1065                        ieee80211_chandef_vht_oper(&local->hw, vht_cap_info,
1066                                                   elems->vht_operation,
1067                                                   elems->ht_operation,
1068                                                   &chandef);
1069                        memcpy(&cap_ie, elems->vht_cap_elem, sizeof(cap_ie));
1070                        ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
1071                                                            &cap_ie, sta);
1072                        if (memcmp(&cap, &sta->sta.vht_cap, sizeof(cap)))
1073                                rates_updated |= true;
1074                }
1075
1076                if (bw != sta->sta.bandwidth)
1077                        rates_updated |= true;
1078
1079                if (!cfg80211_chandef_compatible(&sdata->u.ibss.chandef,
1080                                                 &chandef))
1081                        WARN_ON_ONCE(1);
1082        }
1083
1084        if (sta && rates_updated) {
1085                u32 changed = IEEE80211_RC_SUPP_RATES_CHANGED;
1086                u8 rx_nss = sta->sta.rx_nss;
1087
1088                /* Force rx_nss recalculation */
1089                sta->sta.rx_nss = 0;
1090                rate_control_rate_init(sta);
1091                if (sta->sta.rx_nss != rx_nss)
1092                        changed |= IEEE80211_RC_NSS_CHANGED;
1093
1094                drv_sta_rc_update(local, sdata, &sta->sta, changed);
1095        }
1096
1097        rcu_read_unlock();
1098}
1099
1100static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1101                                  struct ieee80211_mgmt *mgmt, size_t len,
1102                                  struct ieee80211_rx_status *rx_status,
1103                                  struct ieee802_11_elems *elems)
1104{
1105        struct ieee80211_local *local = sdata->local;
1106        struct cfg80211_bss *cbss;
1107        struct ieee80211_bss *bss;
1108        struct ieee80211_channel *channel;
1109        u64 beacon_timestamp, rx_timestamp;
1110        u32 supp_rates = 0;
1111        enum nl80211_band band = rx_status->band;
1112
1113        channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
1114        if (!channel)
1115                return;
1116
1117        ieee80211_update_sta_info(sdata, mgmt, len, rx_status, elems, channel);
1118
1119        bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, channel);
1120        if (!bss)
1121                return;
1122
1123        cbss = container_of((void *)bss, struct cfg80211_bss, priv);
1124
1125        /* same for beacon and probe response */
1126        beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp);
1127
1128        /* check if we need to merge IBSS */
1129
1130        /* not an IBSS */
1131        if (!(cbss->capability & WLAN_CAPABILITY_IBSS))
1132                goto put_bss;
1133
1134        /* different channel */
1135        if (sdata->u.ibss.fixed_channel &&
1136            sdata->u.ibss.chandef.chan != cbss->channel)
1137                goto put_bss;
1138
1139        /* different SSID */
1140        if (elems->ssid_len != sdata->u.ibss.ssid_len ||
1141            memcmp(elems->ssid, sdata->u.ibss.ssid,
1142                                sdata->u.ibss.ssid_len))
1143                goto put_bss;
1144
1145        /* process channel switch */
1146        if (sdata->vif.csa_active ||
1147            ieee80211_ibss_process_chanswitch(sdata, elems, true))
1148                goto put_bss;
1149
1150        /* same BSSID */
1151        if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid))
1152                goto put_bss;
1153
1154        /* we use a fixed BSSID */
1155        if (sdata->u.ibss.fixed_bssid)
1156                goto put_bss;
1157
1158        if (ieee80211_have_rx_timestamp(rx_status)) {
1159                /* time when timestamp field was received */
1160                rx_timestamp =
1161                        ieee80211_calculate_rx_timestamp(local, rx_status,
1162                                                         len + FCS_LEN, 24);
1163        } else {
1164                /*
1165                 * second best option: get current TSF
1166                 * (will return -1 if not supported)
1167                 */
1168                rx_timestamp = drv_get_tsf(local, sdata);
1169        }
1170
1171        ibss_dbg(sdata, "RX beacon SA=%pM BSSID=%pM TSF=0x%llx\n",
1172                 mgmt->sa, mgmt->bssid,
1173                 (unsigned long long)rx_timestamp);
1174        ibss_dbg(sdata, "\tBCN=0x%llx diff=%lld @%lu\n",
1175                 (unsigned long long)beacon_timestamp,
1176                 (unsigned long long)(rx_timestamp - beacon_timestamp),
1177                 jiffies);
1178
1179        if (beacon_timestamp > rx_timestamp) {
1180                ibss_dbg(sdata,
1181                         "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n",
1182                         mgmt->bssid);
1183                ieee80211_sta_join_ibss(sdata, bss);
1184                supp_rates = ieee80211_sta_get_rates(sdata, elems, band, NULL);
1185                ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa,
1186                                       supp_rates);
1187                rcu_read_unlock();
1188        }
1189
1190 put_bss:
1191        ieee80211_rx_bss_put(local, bss);
1192}
1193
1194void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata,
1195                              const u8 *bssid, const u8 *addr,
1196                              u32 supp_rates)
1197{
1198        struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1199        struct ieee80211_local *local = sdata->local;
1200        struct sta_info *sta;
1201        struct ieee80211_chanctx_conf *chanctx_conf;
1202        struct ieee80211_supported_band *sband;
1203        enum nl80211_bss_scan_width scan_width;
1204        int band;
1205
1206        /*
1207         * XXX: Consider removing the least recently used entry and
1208         *      allow new one to be added.
1209         */
1210        if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
1211                net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
1212                                    sdata->name, addr);
1213                return;
1214        }
1215
1216        if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH)
1217                return;
1218
1219        if (!ether_addr_equal(bssid, sdata->u.ibss.bssid))
1220                return;
1221
1222        rcu_read_lock();
1223        chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1224        if (WARN_ON_ONCE(!chanctx_conf)) {
1225                rcu_read_unlock();
1226                return;
1227        }
1228        band = chanctx_conf->def.chan->band;
1229        scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
1230        rcu_read_unlock();
1231
1232        sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
1233        if (!sta)
1234                return;
1235
1236        /* make sure mandatory rates are always added */
1237        sband = local->hw.wiphy->bands[band];
1238        sta->sta.supp_rates[band] = supp_rates |
1239                        ieee80211_mandatory_rates(sband, scan_width);
1240
1241        spin_lock(&ifibss->incomplete_lock);
1242        list_add(&sta->list, &ifibss->incomplete_stations);
1243        spin_unlock(&ifibss->incomplete_lock);
1244        ieee80211_queue_work(&local->hw, &sdata->work);
1245}
1246
1247static void ieee80211_ibss_sta_expire(struct ieee80211_sub_if_data *sdata)
1248{
1249        struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1250        struct ieee80211_local *local = sdata->local;
1251        struct sta_info *sta, *tmp;
1252        unsigned long exp_time = IEEE80211_IBSS_INACTIVITY_LIMIT;
1253        unsigned long exp_rsn = IEEE80211_IBSS_RSN_INACTIVITY_LIMIT;
1254
1255        mutex_lock(&local->sta_mtx);
1256
1257        list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
1258                unsigned long last_active = ieee80211_sta_last_active(sta);
1259
1260                if (sdata != sta->sdata)
1261                        continue;
1262
1263                if (time_is_before_jiffies(last_active + exp_time) ||
1264                    (time_is_before_jiffies(last_active + exp_rsn) &&
1265                     sta->sta_state != IEEE80211_STA_AUTHORIZED)) {
1266                        u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
1267
1268                        sta_dbg(sta->sdata, "expiring inactive %sSTA %pM\n",
1269                                sta->sta_state != IEEE80211_STA_AUTHORIZED ?
1270                                "not authorized " : "", sta->sta.addr);
1271
1272                        ieee80211_send_deauth_disassoc(sdata, sta->sta.addr,
1273                                                       ifibss->bssid,
1274                                                       IEEE80211_STYPE_DEAUTH,
1275                                                       WLAN_REASON_DEAUTH_LEAVING,
1276                                                       true, frame_buf);
1277                        WARN_ON(__sta_info_destroy(sta));
1278                }
1279        }
1280
1281        mutex_unlock(&local->sta_mtx);
1282}
1283
1284/*
1285 * This function is called with state == IEEE80211_IBSS_MLME_JOINED
1286 */
1287
1288static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
1289{
1290        struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1291        enum nl80211_bss_scan_width scan_width;
1292
1293        sdata_assert_lock(sdata);
1294
1295        mod_timer(&ifibss->timer,
1296                  round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
1297
1298        ieee80211_ibss_sta_expire(sdata);
1299
1300        if (time_before(jiffies, ifibss->last_scan_completed +
1301                       IEEE80211_IBSS_MERGE_INTERVAL))
1302                return;
1303
1304        if (ieee80211_sta_active_ibss(sdata))
1305                return;
1306
1307        if (ifibss->fixed_channel)
1308                return;
1309
1310        sdata_info(sdata,
1311                   "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n");
1312
1313        scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
1314        ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len,
1315                                    NULL, 0, scan_width);
1316}
1317
1318static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
1319{
1320        struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1321        u8 bssid[ETH_ALEN];
1322        u16 capability;
1323        int i;
1324
1325        sdata_assert_lock(sdata);
1326
1327        if (ifibss->fixed_bssid) {
1328                memcpy(bssid, ifibss->bssid, ETH_ALEN);
1329        } else {
1330                /* Generate random, not broadcast, locally administered BSSID. Mix in
1331                 * own MAC address to make sure that devices that do not have proper
1332                 * random number generator get different BSSID. */
1333                get_random_bytes(bssid, ETH_ALEN);
1334                for (i = 0; i < ETH_ALEN; i++)
1335                        bssid[i] ^= sdata->vif.addr[i];
1336                bssid[0] &= ~0x01;
1337                bssid[0] |= 0x02;
1338        }
1339
1340        sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid);
1341
1342        capability = WLAN_CAPABILITY_IBSS;
1343
1344        if (ifibss->privacy)
1345                capability |= WLAN_CAPABILITY_PRIVACY;
1346
1347        __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int,
1348                                  &ifibss->chandef, ifibss->basic_rates,
1349                                  capability, 0, true);
1350}
1351
1352static unsigned ibss_setup_channels(struct wiphy *wiphy,
1353                                    struct ieee80211_channel **channels,
1354                                    unsigned int channels_max,
1355                                    u32 center_freq, u32 width)
1356{
1357        struct ieee80211_channel *chan = NULL;
1358        unsigned int n_chan = 0;
1359        u32 start_freq, end_freq, freq;
1360
1361        if (width <= 20) {
1362                start_freq = center_freq;
1363                end_freq = center_freq;
1364        } else {
1365                start_freq = center_freq - width / 2 + 10;
1366                end_freq = center_freq + width / 2 - 10;
1367        }
1368
1369        for (freq = start_freq; freq <= end_freq; freq += 20) {
1370                chan = ieee80211_get_channel(wiphy, freq);
1371                if (!chan)
1372                        continue;
1373                if (n_chan >= channels_max)
1374                        return n_chan;
1375
1376                channels[n_chan] = chan;
1377                n_chan++;
1378        }
1379
1380        return n_chan;
1381}
1382
1383static unsigned int
1384ieee80211_ibss_setup_scan_channels(struct wiphy *wiphy,
1385                                   const struct cfg80211_chan_def *chandef,
1386                                   struct ieee80211_channel **channels,
1387                                   unsigned int channels_max)
1388{
1389        unsigned int n_chan = 0;
1390        u32 width, cf1, cf2 = 0;
1391
1392        switch (chandef->width) {
1393        case NL80211_CHAN_WIDTH_40:
1394                width = 40;
1395                break;
1396        case NL80211_CHAN_WIDTH_80P80:
1397                cf2 = chandef->center_freq2;
1398                fallthrough;
1399        case NL80211_CHAN_WIDTH_80:
1400                width = 80;
1401                break;
1402        case NL80211_CHAN_WIDTH_160:
1403                width = 160;
1404                break;
1405        default:
1406                width = 20;
1407                break;
1408        }
1409
1410        cf1 = chandef->center_freq1;
1411
1412        n_chan = ibss_setup_channels(wiphy, channels, channels_max, cf1, width);
1413
1414        if (cf2)
1415                n_chan += ibss_setup_channels(wiphy, &channels[n_chan],
1416                                              channels_max - n_chan, cf2,
1417                                              width);
1418
1419        return n_chan;
1420}
1421
1422/*
1423 * This function is called with state == IEEE80211_IBSS_MLME_SEARCH
1424 */
1425
1426static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
1427{
1428        struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1429        struct ieee80211_local *local = sdata->local;
1430        struct cfg80211_bss *cbss;
1431        struct ieee80211_channel *chan = NULL;
1432        const u8 *bssid = NULL;
1433        enum nl80211_bss_scan_width scan_width;
1434        int active_ibss;
1435
1436        sdata_assert_lock(sdata);
1437
1438        active_ibss = ieee80211_sta_active_ibss(sdata);
1439        ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss);
1440
1441        if (active_ibss)
1442                return;
1443
1444        if (ifibss->fixed_bssid)
1445                bssid = ifibss->bssid;
1446        if (ifibss->fixed_channel)
1447                chan = ifibss->chandef.chan;
1448        if (!is_zero_ether_addr(ifibss->bssid))
1449                bssid = ifibss->bssid;
1450        cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid,
1451                                ifibss->ssid, ifibss->ssid_len,
1452                                IEEE80211_BSS_TYPE_IBSS,
1453                                IEEE80211_PRIVACY(ifibss->privacy));
1454
1455        if (cbss) {
1456                struct ieee80211_bss *bss;
1457
1458                bss = (void *)cbss->priv;
1459                ibss_dbg(sdata,
1460                         "sta_find_ibss: selected %pM current %pM\n",
1461                         cbss->bssid, ifibss->bssid);
1462                sdata_info(sdata,
1463                           "Selected IBSS BSSID %pM based on configured SSID\n",
1464                           cbss->bssid);
1465
1466                ieee80211_sta_join_ibss(sdata, bss);
1467                ieee80211_rx_bss_put(local, bss);
1468                return;
1469        }
1470
1471        /* if a fixed bssid and a fixed freq have been provided create the IBSS
1472         * directly and do not waste time scanning
1473         */
1474        if (ifibss->fixed_bssid && ifibss->fixed_channel) {
1475                sdata_info(sdata, "Created IBSS using preconfigured BSSID %pM\n",
1476                           bssid);
1477                ieee80211_sta_create_ibss(sdata);
1478                return;
1479        }
1480
1481
1482        ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n");
1483
1484        /* Selected IBSS not found in current scan results - try to scan */
1485        if (time_after(jiffies, ifibss->last_scan_completed +
1486                                        IEEE80211_SCAN_INTERVAL)) {
1487                struct ieee80211_channel *channels[8];
1488                unsigned int num;
1489
1490                sdata_info(sdata, "Trigger new scan to find an IBSS to join\n");
1491
1492                scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
1493
1494                if (ifibss->fixed_channel) {
1495                        num = ieee80211_ibss_setup_scan_channels(local->hw.wiphy,
1496                                                                 &ifibss->chandef,
1497                                                                 channels,
1498                                                                 ARRAY_SIZE(channels));
1499                        ieee80211_request_ibss_scan(sdata, ifibss->ssid,
1500                                                    ifibss->ssid_len, channels,
1501                                                    num, scan_width);
1502                } else {
1503                        ieee80211_request_ibss_scan(sdata, ifibss->ssid,
1504                                                    ifibss->ssid_len, NULL,
1505                                                    0, scan_width);
1506                }
1507        } else {
1508                int interval = IEEE80211_SCAN_INTERVAL;
1509
1510                if (time_after(jiffies, ifibss->ibss_join_req +
1511                               IEEE80211_IBSS_JOIN_TIMEOUT))
1512                        ieee80211_sta_create_ibss(sdata);
1513
1514                mod_timer(&ifibss->timer,
1515                          round_jiffies(jiffies + interval));
1516        }
1517}
1518
1519static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
1520                                        struct sk_buff *req)
1521{
1522        struct ieee80211_mgmt *mgmt = (void *)req->data;
1523        struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1524        struct ieee80211_local *local = sdata->local;
1525        int tx_last_beacon, len = req->len;
1526        struct sk_buff *skb;
1527        struct beacon_data *presp;
1528        u8 *pos, *end;
1529
1530        sdata_assert_lock(sdata);
1531
1532        presp = rcu_dereference_protected(ifibss->presp,
1533                                          lockdep_is_held(&sdata->wdev.mtx));
1534
1535        if (ifibss->state != IEEE80211_IBSS_MLME_JOINED ||
1536            len < 24 + 2 || !presp)
1537                return;
1538
1539        tx_last_beacon = drv_tx_last_beacon(local);
1540
1541        ibss_dbg(sdata, "RX ProbeReq SA=%pM DA=%pM\n", mgmt->sa, mgmt->da);
1542        ibss_dbg(sdata, "\tBSSID=%pM (tx_last_beacon=%d)\n",
1543                 mgmt->bssid, tx_last_beacon);
1544
1545        if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da))
1546                return;
1547
1548        if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) &&
1549            !is_broadcast_ether_addr(mgmt->bssid))
1550                return;
1551
1552        end = ((u8 *) mgmt) + len;
1553        pos = mgmt->u.probe_req.variable;
1554        if (pos[0] != WLAN_EID_SSID ||
1555            pos + 2 + pos[1] > end) {
1556                ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n",
1557                         mgmt->sa);
1558                return;
1559        }
1560        if (pos[1] != 0 &&
1561            (pos[1] != ifibss->ssid_len ||
1562             memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) {
1563                /* Ignore ProbeReq for foreign SSID */
1564                return;
1565        }
1566
1567        /* Reply with ProbeResp */
1568        skb = dev_alloc_skb(local->tx_headroom + presp->head_len);
1569        if (!skb)
1570                return;
1571
1572        skb_reserve(skb, local->tx_headroom);
1573        skb_put_data(skb, presp->head, presp->head_len);
1574
1575        memcpy(((struct ieee80211_mgmt *) skb->data)->da, mgmt->sa, ETH_ALEN);
1576        ibss_dbg(sdata, "Sending ProbeResp to %pM\n", mgmt->sa);
1577        IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1578
1579        /* avoid excessive retries for probe request to wildcard SSIDs */
1580        if (pos[1] == 0)
1581                IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_NO_ACK;
1582
1583        ieee80211_tx_skb(sdata, skb);
1584}
1585
1586static
1587void ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data *sdata,
1588                                    struct ieee80211_mgmt *mgmt, size_t len,
1589                                    struct ieee80211_rx_status *rx_status)
1590{
1591        size_t baselen;
1592        struct ieee802_11_elems *elems;
1593
1594        BUILD_BUG_ON(offsetof(typeof(mgmt->u.probe_resp), variable) !=
1595                     offsetof(typeof(mgmt->u.beacon), variable));
1596
1597        /*
1598         * either beacon or probe_resp but the variable field is at the
1599         * same offset
1600         */
1601        baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1602        if (baselen > len)
1603                return;
1604
1605        elems = ieee802_11_parse_elems(mgmt->u.probe_resp.variable,
1606                                       len - baselen, false,
1607                                       mgmt->bssid, NULL);
1608
1609        if (elems) {
1610                ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, elems);
1611                kfree(elems);
1612        }
1613}
1614
1615void 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                        elems = ieee802_11_parse_elems(
1659                                mgmt->u.action.u.chan_switch.variable,
1660                                ies_len, true, mgmt->bssid, NULL);
1661
1662                        if (elems && !elems->parse_error)
1663                                ieee80211_rx_mgmt_spectrum_mgmt(sdata, mgmt,
1664                                                                skb->len,
1665                                                                rx_status,
1666                                                                elems);
1667                        kfree(elems);
1668                        break;
1669                }
1670        }
1671
1672 mgmt_out:
1673        sdata_unlock(sdata);
1674}
1675
1676void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata)
1677{
1678        struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1679        struct sta_info *sta;
1680
1681        sdata_lock(sdata);
1682
1683        /*
1684         * Work could be scheduled after scan or similar
1685         * when we aren't even joined (or trying) with a
1686         * network.
1687         */
1688        if (!ifibss->ssid_len)
1689                goto out;
1690
1691        spin_lock_bh(&ifibss->incomplete_lock);
1692        while (!list_empty(&ifibss->incomplete_stations)) {
1693                sta = list_first_entry(&ifibss->incomplete_stations,
1694                                       struct sta_info, list);
1695                list_del(&sta->list);
1696                spin_unlock_bh(&ifibss->incomplete_lock);
1697
1698                ieee80211_ibss_finish_sta(sta);
1699                rcu_read_unlock();
1700                spin_lock_bh(&ifibss->incomplete_lock);
1701        }
1702        spin_unlock_bh(&ifibss->incomplete_lock);
1703
1704        switch (ifibss->state) {
1705        case IEEE80211_IBSS_MLME_SEARCH:
1706                ieee80211_sta_find_ibss(sdata);
1707                break;
1708        case IEEE80211_IBSS_MLME_JOINED:
1709                ieee80211_sta_merge_ibss(sdata);
1710                break;
1711        default:
1712                WARN_ON(1);
1713                break;
1714        }
1715
1716 out:
1717        sdata_unlock(sdata);
1718}
1719
1720static void ieee80211_ibss_timer(struct timer_list *t)
1721{
1722        struct ieee80211_sub_if_data *sdata =
1723                from_timer(sdata, t, u.ibss.timer);
1724
1725        ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1726}
1727
1728void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata)
1729{
1730        struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1731
1732        timer_setup(&ifibss->timer, ieee80211_ibss_timer, 0);
1733        INIT_LIST_HEAD(&ifibss->incomplete_stations);
1734        spin_lock_init(&ifibss->incomplete_lock);
1735        INIT_WORK(&ifibss->csa_connection_drop_work,
1736                  ieee80211_csa_connection_drop_work);
1737}
1738
1739/* scan finished notification */
1740void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local)
1741{
1742        struct ieee80211_sub_if_data *sdata;
1743
1744        mutex_lock(&local->iflist_mtx);
1745        list_for_each_entry(sdata, &local->interfaces, list) {
1746                if (!ieee80211_sdata_running(sdata))
1747                        continue;
1748                if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
1749                        continue;
1750                sdata->u.ibss.last_scan_completed = jiffies;
1751        }
1752        mutex_unlock(&local->iflist_mtx);
1753}
1754
1755int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
1756                        struct cfg80211_ibss_params *params)
1757{
1758        u32 changed = 0;
1759        u32 rate_flags;
1760        struct ieee80211_supported_band *sband;
1761        enum ieee80211_chanctx_mode chanmode;
1762        struct ieee80211_local *local = sdata->local;
1763        int radar_detect_width = 0;
1764        int i;
1765        int ret;
1766
1767        if (params->chandef.chan->freq_offset) {
1768                /* this may work, but is untested */
1769                return -EOPNOTSUPP;
1770        }
1771
1772        ret = cfg80211_chandef_dfs_required(local->hw.wiphy,
1773                                            &params->chandef,
1774                                            sdata->wdev.iftype);
1775        if (ret < 0)
1776                return ret;
1777
1778        if (ret > 0) {
1779                if (!params->userspace_handles_dfs)
1780                        return -EINVAL;
1781                radar_detect_width = BIT(params->chandef.width);
1782        }
1783
1784        chanmode = (params->channel_fixed && !ret) ?
1785                IEEE80211_CHANCTX_SHARED : IEEE80211_CHANCTX_EXCLUSIVE;
1786
1787        mutex_lock(&local->chanctx_mtx);
1788        ret = ieee80211_check_combinations(sdata, &params->chandef, chanmode,
1789                                           radar_detect_width);
1790        mutex_unlock(&local->chanctx_mtx);
1791        if (ret < 0)
1792                return ret;
1793
1794        if (params->bssid) {
1795                memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN);
1796                sdata->u.ibss.fixed_bssid = true;
1797        } else
1798                sdata->u.ibss.fixed_bssid = false;
1799
1800        sdata->u.ibss.privacy = params->privacy;
1801        sdata->u.ibss.control_port = params->control_port;
1802        sdata->u.ibss.userspace_handles_dfs = params->userspace_handles_dfs;
1803        sdata->u.ibss.basic_rates = params->basic_rates;
1804        sdata->u.ibss.last_scan_completed = jiffies;
1805
1806        /* fix basic_rates if channel does not support these rates */
1807        rate_flags = ieee80211_chandef_rate_flags(&params->chandef);
1808        sband = local->hw.wiphy->bands[params->chandef.chan->band];
1809        for (i = 0; i < sband->n_bitrates; i++) {
1810                if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
1811                        sdata->u.ibss.basic_rates &= ~BIT(i);
1812        }
1813        memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate,
1814               sizeof(params->mcast_rate));
1815
1816        sdata->vif.bss_conf.beacon_int = params->beacon_interval;
1817
1818        sdata->u.ibss.chandef = params->chandef;
1819        sdata->u.ibss.fixed_channel = params->channel_fixed;
1820
1821        if (params->ie) {
1822                sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len,
1823                                           GFP_KERNEL);
1824                if (sdata->u.ibss.ie)
1825                        sdata->u.ibss.ie_len = params->ie_len;
1826        }
1827
1828        sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
1829        sdata->u.ibss.ibss_join_req = jiffies;
1830
1831        memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len);
1832        sdata->u.ibss.ssid_len = params->ssid_len;
1833
1834        memcpy(&sdata->u.ibss.ht_capa, &params->ht_capa,
1835               sizeof(sdata->u.ibss.ht_capa));
1836        memcpy(&sdata->u.ibss.ht_capa_mask, &params->ht_capa_mask,
1837               sizeof(sdata->u.ibss.ht_capa_mask));
1838
1839        /*
1840         * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is
1841         * reserved, but an HT STA shall protect HT transmissions as though
1842         * the HT Protection field were set to non-HT mixed mode.
1843         *
1844         * In an IBSS, the RIFS Mode field of the HT Operation element is
1845         * also reserved, but an HT STA shall operate as though this field
1846         * were set to 1.
1847         */
1848
1849        sdata->vif.bss_conf.ht_operation_mode |=
1850                  IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED
1851                | IEEE80211_HT_PARAM_RIFS_MODE;
1852
1853        changed |= BSS_CHANGED_HT | BSS_CHANGED_MCAST_RATE;
1854        ieee80211_bss_info_change_notify(sdata, changed);
1855
1856        sdata->smps_mode = IEEE80211_SMPS_OFF;
1857        sdata->needed_rx_chains = local->rx_chains;
1858        sdata->control_port_over_nl80211 = params->control_port_over_nl80211;
1859
1860        ieee80211_queue_work(&local->hw, &sdata->work);
1861
1862        return 0;
1863}
1864
1865int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata)
1866{
1867        struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1868
1869        ieee80211_ibss_disconnect(sdata);
1870        ifibss->ssid_len = 0;
1871        eth_zero_addr(ifibss->bssid);
1872
1873        /* remove beacon */
1874        kfree(sdata->u.ibss.ie);
1875        sdata->u.ibss.ie = NULL;
1876        sdata->u.ibss.ie_len = 0;
1877
1878        /* on the next join, re-program HT parameters */
1879        memset(&ifibss->ht_capa, 0, sizeof(ifibss->ht_capa));
1880        memset(&ifibss->ht_capa_mask, 0, sizeof(ifibss->ht_capa_mask));
1881
1882        synchronize_rcu();
1883
1884        skb_queue_purge(&sdata->skb_queue);
1885
1886        del_timer_sync(&sdata->u.ibss.timer);
1887
1888        return 0;
1889}
1890