net/mac80211/ibss.c

   1 /*
   2  * IBSS mode implementation
   3  * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
   4  * Copyright 2004, Instant802 Networks, Inc.
   5  * Copyright 2005, Devicescape Software, Inc.
   6  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   7  * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
   8  * Copyright 2009, Johannes Berg <johannes@sipsolutions.net>
   9  * Copyright 2013-2014  Intel Mobile Communications GmbH
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License version 2 as
  13  * published by the Free Software Foundation.
  14  */
  15
  16 #include <linux/delay.h>
  17 #include <linux/slab.h>
  18 #include <linux/if_ether.h>
  19 #include <linux/skbuff.h>
  20 #include <linux/if_arp.h>
  21 #include <linux/etherdevice.h>
  22 #include <linux/rtnetlink.h>
  23 #include <net/mac80211.h>
  24
  25 #include "ieee80211_i.h"
  26 #include "driver-ops.h"
  27 #include "rate.h"
  28
  29 #define IEEE80211_SCAN_INTERVAL (2 * HZ)
  30 #define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ)
  31
  32 #define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ)
  33 #define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ)
  34 #define IEEE80211_IBSS_RSN_INACTIVITY_LIMIT (10 * HZ)
  35
  36 #define IEEE80211_IBSS_MAX_STA_ENTRIES 128
  37
  38 static struct beacon_data *
  39 ieee80211_ibss_build_presp(struct ieee80211_sub_if_data *sdata,
  40                            const int beacon_int, const u32 basic_rates,
  41                            const u16 capability, u64 tsf,
  42                            struct cfg80211_chan_def *chandef,
  43                            bool *have_higher_than_11mbit,
  44                            struct cfg80211_csa_settings *csa_settings)
  45 {
  46         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
  47         struct ieee80211_local *local = sdata->local;
  48         int rates_n = 0, i, ri;
  49         struct ieee80211_mgmt *mgmt;
  50         u8 *pos;
  51         struct ieee80211_supported_band *sband;
  52         u32 rate_flags, rates = 0, rates_added = 0;
  53         struct beacon_data *presp;
  54         int frame_len;
  55         int shift;
  56
  57         /* Build IBSS probe response */
  58         frame_len = sizeof(struct ieee80211_hdr_3addr) +
  59                     12 /* struct ieee80211_mgmt.u.beacon */ +
  60                     2 + IEEE80211_MAX_SSID_LEN /* max SSID */ +
  61                     2 + 8 /* max Supported Rates */ +
  62                     3 /* max DS params */ +
  63                     4 /* IBSS params */ +
  64                     5 /* Channel Switch Announcement */ +
  65                     2 + (IEEE80211_MAX_SUPP_RATES - 8) +
  66                     2 + sizeof(struct ieee80211_ht_cap) +
  67                     2 + sizeof(struct ieee80211_ht_operation) +
  68                     ifibss->ie_len;
  69         presp = kzalloc(sizeof(*presp) + frame_len, GFP_KERNEL);
  70         if (!presp)
  71                 return NULL;
  72
  73         presp->head = (void *)(presp + 1);
  74
  75         mgmt = (void *) presp->head;
  76         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
  77                                           IEEE80211_STYPE_PROBE_RESP);
  78         eth_broadcast_addr(mgmt->da);
  79         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
  80         memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN);
  81         mgmt->u.beacon.beacon_int = cpu_to_le16(beacon_int);
  82         mgmt->u.beacon.timestamp = cpu_to_le64(tsf);
  83         mgmt->u.beacon.capab_info = cpu_to_le16(capability);
  84
  85         pos = (u8 *)mgmt + offsetof(struct ieee80211_mgmt, u.beacon.variable);
  86
  87         *pos++ = WLAN_EID_SSID;
  88         *pos++ = ifibss->ssid_len;
  89         memcpy(pos, ifibss->ssid, ifibss->ssid_len);
  90         pos += ifibss->ssid_len;
  91
  92         sband = local->hw.wiphy->bands[chandef->chan->band];
  93         rate_flags = ieee80211_chandef_rate_flags(chandef);
  94         shift = ieee80211_chandef_get_shift(chandef);
  95         rates_n = 0;
  96         if (have_higher_than_11mbit)
  97                 *have_higher_than_11mbit = false;
  98
  99         for (i = 0; i < sband->n_bitrates; i++) {
 100                 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
 101                         continue;
 102                 if (sband->bitrates[i].bitrate > 110 &&
 103                     have_higher_than_11mbit)
 104                         *have_higher_than_11mbit = true;
 105
 106                 rates |= BIT(i);
 107                 rates_n++;
 108         }
 109
 110         *pos++ = WLAN_EID_SUPP_RATES;
 111         *pos++ = min_t(int, 8, rates_n);
 112         for (ri = 0; ri < sband->n_bitrates; ri++) {
 113                 int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate,
 114                                         5 * (1 << shift));
 115                 u8 basic = 0;
 116                 if (!(rates & BIT(ri)))
 117                         continue;
 118
 119                 if (basic_rates & BIT(ri))
 120                         basic = 0x80;
 121                 *pos++ = basic | (u8) rate;
 122                 if (++rates_added == 8) {
 123                         ri++; /* continue at next rate for EXT_SUPP_RATES */
 124                         break;
 125                 }
 126         }
 127
 128         if (sband->band == IEEE80211_BAND_2GHZ) {
 129                 *pos++ = WLAN_EID_DS_PARAMS;
 130                 *pos++ = 1;
 131                 *pos++ = ieee80211_frequency_to_channel(
 132                                 chandef->chan->center_freq);
 133         }
 134
 135         *pos++ = WLAN_EID_IBSS_PARAMS;
 136         *pos++ = 2;
 137         /* FIX: set ATIM window based on scan results */
 138         *pos++ = 0;
 139         *pos++ = 0;
 140
 141         if (csa_settings) {
 142                 *pos++ = WLAN_EID_CHANNEL_SWITCH;
 143                 *pos++ = 3;
 144                 *pos++ = csa_settings->block_tx ? 1 : 0;
 145                 *pos++ = ieee80211_frequency_to_channel(
 146                                 csa_settings->chandef.chan->center_freq);
 147                 presp->csa_counter_offsets[0] = (pos - presp->head);
 148                 *pos++ = csa_settings->count;
 149         }
 150
 151         /* put the remaining rates in WLAN_EID_EXT_SUPP_RATES */
 152         if (rates_n > 8) {
 153                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 154                 *pos++ = rates_n - 8;
 155                 for (; ri < sband->n_bitrates; ri++) {
 156                         int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate,
 157                                                 5 * (1 << shift));
 158                         u8 basic = 0;
 159                         if (!(rates & BIT(ri)))
 160                                 continue;
 161
 162                         if (basic_rates & BIT(ri))
 163                                 basic = 0x80;
 164                         *pos++ = basic | (u8) rate;
 165                 }
 166         }
 167
 168         if (ifibss->ie_len) {
 169                 memcpy(pos, ifibss->ie, ifibss->ie_len);
 170                 pos += ifibss->ie_len;
 171         }
 172
 173         /* add HT capability and information IEs */
 174         if (chandef->width != NL80211_CHAN_WIDTH_20_NOHT &&
 175             chandef->width != NL80211_CHAN_WIDTH_5 &&
 176             chandef->width != NL80211_CHAN_WIDTH_10 &&
 177             sband->ht_cap.ht_supported) {
 178                 struct ieee80211_sta_ht_cap ht_cap;
 179
 180                 memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
 181                 ieee80211_apply_htcap_overrides(sdata, &ht_cap);
 182
 183                 pos = ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap);
 184                 /*
 185                  * Note: According to 802.11n-2009 9.13.3.1, HT Protection
 186                  * field and RIFS Mode are reserved in IBSS mode, therefore
 187                  * keep them at 0
 188                  */
 189                 pos = ieee80211_ie_build_ht_oper(pos, &sband->ht_cap,
 190                                                  chandef, 0);
 191         }
 192
 193         if (local->hw.queues >= IEEE80211_NUM_ACS)
 194                 pos = ieee80211_add_wmm_info_ie(pos, 0); /* U-APSD not in use */
 195
 196         presp->head_len = pos - presp->head;
 197         if (WARN_ON(presp->head_len > frame_len))
 198                 goto error;
 199
 200         return presp;
 201 error:
 202         kfree(presp);
 203         return NULL;
 204 }
 205
 206 static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
 207                                       const u8 *bssid, const int beacon_int,
 208                                       struct cfg80211_chan_def *req_chandef,
 209                                       const u32 basic_rates,
 210                                       const u16 capability, u64 tsf,
 211                                       bool creator)
 212 {
 213         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 214         struct ieee80211_local *local = sdata->local;
 215         struct ieee80211_mgmt *mgmt;
 216         struct cfg80211_bss *bss;
 217         u32 bss_change;
 218         struct cfg80211_chan_def chandef;
 219         struct ieee80211_channel *chan;
 220         struct beacon_data *presp;
 221         enum nl80211_bss_scan_width scan_width;
 222         bool have_higher_than_11mbit;
 223         bool radar_required;
 224         int err;
 225
 226         sdata_assert_lock(sdata);
 227
 228         /* Reset own TSF to allow time synchronization work. */
 229         drv_reset_tsf(local, sdata);
 230
 231         if (!ether_addr_equal(ifibss->bssid, bssid))
 232                 sta_info_flush(sdata);
 233
 234         /* if merging, indicate to driver that we leave the old IBSS */
 235         if (sdata->vif.bss_conf.ibss_joined) {
 236                 sdata->vif.bss_conf.ibss_joined = false;
 237                 sdata->vif.bss_conf.ibss_creator = false;
 238                 sdata->vif.bss_conf.enable_beacon = false;
 239                 netif_carrier_off(sdata->dev);
 240                 ieee80211_bss_info_change_notify(sdata,
 241                                                  BSS_CHANGED_IBSS |
 242                                                  BSS_CHANGED_BEACON_ENABLED);
 243                 drv_leave_ibss(local, sdata);
 244         }
 245
 246         presp = rcu_dereference_protected(ifibss->presp,
 247                                           lockdep_is_held(&sdata->wdev.mtx));
 248         RCU_INIT_POINTER(ifibss->presp, NULL);
 249         if (presp)
 250                 kfree_rcu(presp, rcu_head);
 251
 252         /* make a copy of the chandef, it could be modified below. */
 253         chandef = *req_chandef;
 254         chan = chandef.chan;
 255         if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef,
 256                                      NL80211_IFTYPE_ADHOC)) {
 257                 if (chandef.width == NL80211_CHAN_WIDTH_5 ||
 258                     chandef.width == NL80211_CHAN_WIDTH_10 ||
 259                     chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
 260                     chandef.width == NL80211_CHAN_WIDTH_20) {
 261                         sdata_info(sdata,
 262                                    "Failed to join IBSS, beacons forbidden\n");
 263                         return;
 264                 }
 265                 chandef.width = NL80211_CHAN_WIDTH_20;
 266                 chandef.center_freq1 = chan->center_freq;
 267                 /* check again for downgraded chandef */
 268                 if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef,
 269                                              NL80211_IFTYPE_ADHOC)) {
 270                         sdata_info(sdata,
 271                                    "Failed to join IBSS, beacons forbidden\n");
 272                         return;
 273                 }
 274         }
 275
 276         err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
 277                                             &chandef, NL80211_IFTYPE_ADHOC);
 278         if (err < 0) {
 279                 sdata_info(sdata,
 280                            "Failed to join IBSS, invalid chandef\n");
 281                 return;
 282         }
 283         if (err > 0 && !ifibss->userspace_handles_dfs) {
 284                 sdata_info(sdata,
 285                            "Failed to join IBSS, DFS channel without control program\n");
 286                 return;
 287         }
 288
 289         radar_required = err;
 290
 291         mutex_lock(&local->mtx);
 292         if (ieee80211_vif_use_channel(sdata, &chandef,
 293                                       ifibss->fixed_channel ?
 294                                         IEEE80211_CHANCTX_SHARED :
 295                                         IEEE80211_CHANCTX_EXCLUSIVE)) {
 296                 sdata_info(sdata, "Failed to join IBSS, no channel context\n");
 297                 mutex_unlock(&local->mtx);
 298                 return;
 299         }
 300         sdata->radar_required = radar_required;
 301         mutex_unlock(&local->mtx);
 302
 303         memcpy(ifibss->bssid, bssid, ETH_ALEN);
 304
 305         presp = ieee80211_ibss_build_presp(sdata, beacon_int, basic_rates,
 306                                            capability, tsf, &chandef,
 307                                            &have_higher_than_11mbit, NULL);
 308         if (!presp)
 309                 return;
 310
 311         rcu_assign_pointer(ifibss->presp, presp);
 312         mgmt = (void *)presp->head;
 313
 314         sdata->vif.bss_conf.enable_beacon = true;
 315         sdata->vif.bss_conf.beacon_int = beacon_int;
 316         sdata->vif.bss_conf.basic_rates = basic_rates;
 317         sdata->vif.bss_conf.ssid_len = ifibss->ssid_len;
 318         memcpy(sdata->vif.bss_conf.ssid, ifibss->ssid, ifibss->ssid_len);
 319         bss_change = BSS_CHANGED_BEACON_INT;
 320         bss_change |= ieee80211_reset_erp_info(sdata);
 321         bss_change |= BSS_CHANGED_BSSID;
 322         bss_change |= BSS_CHANGED_BEACON;
 323         bss_change |= BSS_CHANGED_BEACON_ENABLED;
 324         bss_change |= BSS_CHANGED_BASIC_RATES;
 325         bss_change |= BSS_CHANGED_HT;
 326         bss_change |= BSS_CHANGED_IBSS;
 327         bss_change |= BSS_CHANGED_SSID;
 328
 329         /*
 330          * In 5 GHz/802.11a, we can always use short slot time.
 331          * (IEEE 802.11-2012 18.3.8.7)
 332          *
 333          * In 2.4GHz, we must always use long slots in IBSS for compatibility
 334          * reasons.
 335          * (IEEE 802.11-2012 19.4.5)
 336          *
 337          * HT follows these specifications (IEEE 802.11-2012 20.3.18)
 338          */
 339         sdata->vif.bss_conf.use_short_slot = chan->band == IEEE80211_BAND_5GHZ;
 340         bss_change |= BSS_CHANGED_ERP_SLOT;
 341
 342         /* cf. IEEE 802.11 9.2.12 */
 343         if (chan->band == IEEE80211_BAND_2GHZ && have_higher_than_11mbit)
 344                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
 345         else
 346                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
 347
 348         ieee80211_set_wmm_default(sdata, true);
 349
 350         sdata->vif.bss_conf.ibss_joined = true;
 351         sdata->vif.bss_conf.ibss_creator = creator;
 352
 353         err = drv_join_ibss(local, sdata);
 354         if (err) {
 355                 sdata->vif.bss_conf.ibss_joined = false;
 356                 sdata->vif.bss_conf.ibss_creator = false;
 357                 sdata->vif.bss_conf.enable_beacon = false;
 358                 sdata->vif.bss_conf.ssid_len = 0;
 359                 RCU_INIT_POINTER(ifibss->presp, NULL);
 360                 kfree_rcu(presp, rcu_head);
 361                 mutex_lock(&local->mtx);
 362                 ieee80211_vif_release_channel(sdata);
 363                 mutex_unlock(&local->mtx);
 364                 sdata_info(sdata, "Failed to join IBSS, driver failure: %d\n",
 365                            err);
 366                 return;
 367         }
 368
 369         ieee80211_bss_info_change_notify(sdata, bss_change);
 370
 371         ifibss->state = IEEE80211_IBSS_MLME_JOINED;
 372         mod_timer(&ifibss->timer,
 373                   round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
 374
 375         scan_width = cfg80211_chandef_to_scan_width(&chandef);
 376         bss = cfg80211_inform_bss_width_frame(local->hw.wiphy, chan,
 377                                               scan_width, mgmt,
 378                                               presp->head_len, 0, GFP_KERNEL);
 379         cfg80211_put_bss(local->hw.wiphy, bss);
 380         netif_carrier_on(sdata->dev);
 381         cfg80211_ibss_joined(sdata->dev, ifibss->bssid, chan, GFP_KERNEL);
 382 }
 383
 384 static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
 385                                     struct ieee80211_bss *bss)
 386 {
 387         struct cfg80211_bss *cbss =
 388                 container_of((void *)bss, struct cfg80211_bss, priv);
 389         struct ieee80211_supported_band *sband;
 390         struct cfg80211_chan_def chandef;
 391         u32 basic_rates;
 392         int i, j;
 393         u16 beacon_int = cbss->beacon_interval;
 394         const struct cfg80211_bss_ies *ies;
 395         enum nl80211_channel_type chan_type;
 396         u64 tsf;
 397         u32 rate_flags;
 398         int shift;
 399
 400         sdata_assert_lock(sdata);
 401
 402         if (beacon_int < 10)
 403                 beacon_int = 10;
 404
 405         switch (sdata->u.ibss.chandef.width) {
 406         case NL80211_CHAN_WIDTH_20_NOHT:
 407         case NL80211_CHAN_WIDTH_20:
 408         case NL80211_CHAN_WIDTH_40:
 409                 chan_type = cfg80211_get_chandef_type(&sdata->u.ibss.chandef);
 410                 cfg80211_chandef_create(&chandef, cbss->channel, chan_type);
 411                 break;
 412         case NL80211_CHAN_WIDTH_5:
 413         case NL80211_CHAN_WIDTH_10:
 414                 cfg80211_chandef_create(&chandef, cbss->channel,
 415                                         NL80211_CHAN_WIDTH_20_NOHT);
 416                 chandef.width = sdata->u.ibss.chandef.width;
 417                 break;
 418         default:
 419                 /* fall back to 20 MHz for unsupported modes */
 420                 cfg80211_chandef_create(&chandef, cbss->channel,
 421                                         NL80211_CHAN_WIDTH_20_NOHT);
 422                 break;
 423         }
 424
 425         sband = sdata->local->hw.wiphy->bands[cbss->channel->band];
 426         rate_flags = ieee80211_chandef_rate_flags(&sdata->u.ibss.chandef);
 427         shift = ieee80211_vif_get_shift(&sdata->vif);
 428
 429         basic_rates = 0;
 430
 431         for (i = 0; i < bss->supp_rates_len; i++) {
 432                 int rate = bss->supp_rates[i] & 0x7f;
 433                 bool is_basic = !!(bss->supp_rates[i] & 0x80);
 434
 435                 for (j = 0; j < sband->n_bitrates; j++) {
 436                         int brate;
 437                         if ((rate_flags & sband->bitrates[j].flags)
 438                             != rate_flags)
 439                                 continue;
 440
 441                         brate = DIV_ROUND_UP(sband->bitrates[j].bitrate,
 442                                              5 * (1 << shift));
 443                         if (brate == rate) {
 444                                 if (is_basic)
 445                                         basic_rates |= BIT(j);
 446                                 break;
 447                         }
 448                 }
 449         }
 450
 451         rcu_read_lock();
 452         ies = rcu_dereference(cbss->ies);
 453         tsf = ies->tsf;
 454         rcu_read_unlock();
 455
 456         __ieee80211_sta_join_ibss(sdata, cbss->bssid,
 457                                   beacon_int,
 458                                   &chandef,
 459                                   basic_rates,
 460                                   cbss->capability,
 461                                   tsf, false);
 462 }
 463
 464 int ieee80211_ibss_csa_beacon(struct ieee80211_sub_if_data *sdata,
 465                               struct cfg80211_csa_settings *csa_settings)
 466 {
 467         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 468         struct beacon_data *presp, *old_presp;
 469         struct cfg80211_bss *cbss;
 470         const struct cfg80211_bss_ies *ies;
 471         u16 capability = 0;
 472         u64 tsf;
 473         int ret = 0;
 474
 475         sdata_assert_lock(sdata);
 476
 477         if (ifibss->privacy)
 478                 capability = WLAN_CAPABILITY_PRIVACY;
 479
 480         cbss = cfg80211_get_bss(sdata->local->hw.wiphy, ifibss->chandef.chan,
 481                                 ifibss->bssid, ifibss->ssid,
 482                                 ifibss->ssid_len, IEEE80211_BSS_TYPE_IBSS,
 483                                 IEEE80211_PRIVACY(ifibss->privacy));
 484
 485         if (WARN_ON(!cbss)) {
 486                 ret = -EINVAL;
 487                 goto out;
 488         }
 489
 490         rcu_read_lock();
 491         ies = rcu_dereference(cbss->ies);
 492         tsf = ies->tsf;
 493         rcu_read_unlock();
 494         cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
 495
 496         old_presp = rcu_dereference_protected(ifibss->presp,
 497                                           lockdep_is_held(&sdata->wdev.mtx));
 498
 499         presp = ieee80211_ibss_build_presp(sdata,
 500                                            sdata->vif.bss_conf.beacon_int,
 501                                            sdata->vif.bss_conf.basic_rates,
 502                                            capability, tsf, &ifibss->chandef,
 503                                            NULL, csa_settings);
 504         if (!presp) {
 505                 ret = -ENOMEM;
 506                 goto out;
 507         }
 508
 509         rcu_assign_pointer(ifibss->presp, presp);
 510         if (old_presp)
 511                 kfree_rcu(old_presp, rcu_head);
 512
 513         return BSS_CHANGED_BEACON;
 514  out:
 515         return ret;
 516 }
 517
 518 int ieee80211_ibss_finish_csa(struct ieee80211_sub_if_data *sdata)
 519 {
 520         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 521         struct cfg80211_bss *cbss;
 522         int err, changed = 0;
 523
 524         sdata_assert_lock(sdata);
 525
 526         /* update cfg80211 bss information with the new channel */
 527         if (!is_zero_ether_addr(ifibss->bssid)) {
 528                 cbss = cfg80211_get_bss(sdata->local->hw.wiphy,
 529                                         ifibss->chandef.chan,
 530                                         ifibss->bssid, ifibss->ssid,
 531                                         ifibss->ssid_len,
 532                                         IEEE80211_BSS_TYPE_IBSS,
 533                                         IEEE80211_PRIVACY(ifibss->privacy));
 534                 /* XXX: should not really modify cfg80211 data */
 535                 if (cbss) {
 536                         cbss->channel = sdata->csa_chandef.chan;
 537                         cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
 538                 }
 539         }
 540
 541         ifibss->chandef = sdata->csa_chandef;
 542
 543         /* generate the beacon */
 544         err = ieee80211_ibss_csa_beacon(sdata, NULL);
 545         if (err < 0)
 546                 return err;
 547
 548         changed |= err;
 549
 550         return changed;
 551 }
 552
 553 void ieee80211_ibss_stop(struct ieee80211_sub_if_data *sdata)
 554 {
 555         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 556
 557         cancel_work_sync(&ifibss->csa_connection_drop_work);
 558 }
 559
 560 static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta)
 561         __acquires(RCU)
 562 {
 563         struct ieee80211_sub_if_data *sdata = sta->sdata;
 564         u8 addr[ETH_ALEN];
 565
 566         memcpy(addr, sta->sta.addr, ETH_ALEN);
 567
 568         ibss_dbg(sdata, "Adding new IBSS station %pM\n", addr);
 569
 570         sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
 571         sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
 572         /* authorize the station only if the network is not RSN protected. If
 573          * not wait for the userspace to authorize it */
 574         if (!sta->sdata->u.ibss.control_port)
 575                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
 576
 577         rate_control_rate_init(sta);
 578
 579         /* If it fails, maybe we raced another insertion? */
 580         if (sta_info_insert_rcu(sta))
 581                 return sta_info_get(sdata, addr);
 582         return sta;
 583 }
 584
 585 static struct sta_info *
 586 ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, const u8 *bssid,
 587                        const u8 *addr, u32 supp_rates)
 588         __acquires(RCU)
 589 {
 590         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 591         struct ieee80211_local *local = sdata->local;
 592         struct sta_info *sta;
 593         struct ieee80211_chanctx_conf *chanctx_conf;
 594         struct ieee80211_supported_band *sband;
 595         enum nl80211_bss_scan_width scan_width;
 596         int band;
 597
 598         /*
 599          * XXX: Consider removing the least recently used entry and
 600          *      allow new one to be added.
 601          */
 602         if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
 603                 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
 604                                     sdata->name, addr);
 605                 rcu_read_lock();
 606                 return NULL;
 607         }
 608
 609         if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) {
 610                 rcu_read_lock();
 611                 return NULL;
 612         }
 613
 614         if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) {
 615                 rcu_read_lock();
 616                 return NULL;
 617         }
 618
 619         rcu_read_lock();
 620         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 621         if (WARN_ON_ONCE(!chanctx_conf))
 622                 return NULL;
 623         band = chanctx_conf->def.chan->band;
 624         scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
 625         rcu_read_unlock();
 626
 627         sta = sta_info_alloc(sdata, addr, GFP_KERNEL);
 628         if (!sta) {
 629                 rcu_read_lock();
 630                 return NULL;
 631         }
 632
 633         sta->last_rx = jiffies;
 634
 635         /* make sure mandatory rates are always added */
 636         sband = local->hw.wiphy->bands[band];
 637         sta->sta.supp_rates[band] = supp_rates |
 638                         ieee80211_mandatory_rates(sband, scan_width);
 639
 640         return ieee80211_ibss_finish_sta(sta);
 641 }
 642
 643 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
 644 {
 645         struct ieee80211_local *local = sdata->local;
 646         int active = 0;
 647         struct sta_info *sta;
 648
 649         sdata_assert_lock(sdata);
 650
 651         rcu_read_lock();
 652
 653         list_for_each_entry_rcu(sta, &local->sta_list, list) {
 654                 if (sta->sdata == sdata &&
 655                     time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
 656                                jiffies)) {
 657                         active++;
 658                         break;
 659                 }
 660         }
 661
 662         rcu_read_unlock();
 663
 664         return active;
 665 }
 666
 667 static void ieee80211_ibss_disconnect(struct ieee80211_sub_if_data *sdata)
 668 {
 669         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 670         struct ieee80211_local *local = sdata->local;
 671         struct cfg80211_bss *cbss;
 672         struct beacon_data *presp;
 673         struct sta_info *sta;
 674
 675         if (!is_zero_ether_addr(ifibss->bssid)) {
 676                 cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->chandef.chan,
 677                                         ifibss->bssid, ifibss->ssid,
 678                                         ifibss->ssid_len,
 679                                         IEEE80211_BSS_TYPE_IBSS,
 680                                         IEEE80211_PRIVACY(ifibss->privacy));
 681
 682                 if (cbss) {
 683                         cfg80211_unlink_bss(local->hw.wiphy, cbss);
 684                         cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
 685                 }
 686         }
 687
 688         ifibss->state = IEEE80211_IBSS_MLME_SEARCH;
 689
 690         sta_info_flush(sdata);
 691
 692         spin_lock_bh(&ifibss->incomplete_lock);
 693         while (!list_empty(&ifibss->incomplete_stations)) {
 694                 sta = list_first_entry(&ifibss->incomplete_stations,
 695                                        struct sta_info, list);
 696                 list_del(&sta->list);
 697                 spin_unlock_bh(&ifibss->incomplete_lock);
 698
 699                 sta_info_free(local, sta);
 700                 spin_lock_bh(&ifibss->incomplete_lock);
 701         }
 702         spin_unlock_bh(&ifibss->incomplete_lock);
 703
 704         netif_carrier_off(sdata->dev);
 705
 706         sdata->vif.bss_conf.ibss_joined = false;
 707         sdata->vif.bss_conf.ibss_creator = false;
 708         sdata->vif.bss_conf.enable_beacon = false;
 709         sdata->vif.bss_conf.ssid_len = 0;
 710
 711         /* remove beacon */
 712         presp = rcu_dereference_protected(ifibss->presp,
 713                                           lockdep_is_held(&sdata->wdev.mtx));
 714         RCU_INIT_POINTER(sdata->u.ibss.presp, NULL);
 715         if (presp)
 716                 kfree_rcu(presp, rcu_head);
 717
 718         clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state);
 719         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED |
 720                                                 BSS_CHANGED_IBSS);
 721         drv_leave_ibss(local, sdata);
 722         mutex_lock(&local->mtx);
 723         ieee80211_vif_release_channel(sdata);
 724         mutex_unlock(&local->mtx);
 725 }
 726
 727 static void ieee80211_csa_connection_drop_work(struct work_struct *work)
 728 {
 729         struct ieee80211_sub_if_data *sdata =
 730                 container_of(work, struct ieee80211_sub_if_data,
 731                              u.ibss.csa_connection_drop_work);
 732
 733         sdata_lock(sdata);
 734
 735         ieee80211_ibss_disconnect(sdata);
 736         synchronize_rcu();
 737         skb_queue_purge(&sdata->skb_queue);
 738
 739         /* trigger a scan to find another IBSS network to join */
 740         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
 741
 742         sdata_unlock(sdata);
 743 }
 744
 745 static void ieee80211_ibss_csa_mark_radar(struct ieee80211_sub_if_data *sdata)
 746 {
 747         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 748         int err;
 749
 750         /* if the current channel is a DFS channel, mark the channel as
 751          * unavailable.
 752          */
 753         err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
 754                                             &ifibss->chandef,
 755                                             NL80211_IFTYPE_ADHOC);
 756         if (err > 0)
 757                 cfg80211_radar_event(sdata->local->hw.wiphy, &ifibss->chandef,
 758                                      GFP_ATOMIC);
 759 }
 760
 761 static bool
 762 ieee80211_ibss_process_chanswitch(struct ieee80211_sub_if_data *sdata,
 763                                   struct ieee802_11_elems *elems,
 764                                   bool beacon)
 765 {
 766         struct cfg80211_csa_settings params;
 767         struct ieee80211_csa_ie csa_ie;
 768         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 769         enum nl80211_channel_type ch_type;
 770         int err;
 771         u32 sta_flags;
 772
 773         sdata_assert_lock(sdata);
 774
 775         sta_flags = IEEE80211_STA_DISABLE_VHT;
 776         switch (ifibss->chandef.width) {
 777         case NL80211_CHAN_WIDTH_5:
 778         case NL80211_CHAN_WIDTH_10:
 779         case NL80211_CHAN_WIDTH_20_NOHT:
 780                 sta_flags |= IEEE80211_STA_DISABLE_HT;
 781                 /* fall through */
 782         case NL80211_CHAN_WIDTH_20:
 783                 sta_flags |= IEEE80211_STA_DISABLE_40MHZ;
 784                 break;
 785         default:
 786                 break;
 787         }
 788
 789         memset(&params, 0, sizeof(params));
 790         memset(&csa_ie, 0, sizeof(csa_ie));
 791         err = ieee80211_parse_ch_switch_ie(sdata, elems,
 792                                            ifibss->chandef.chan->band,
 793                                            sta_flags, ifibss->bssid, &csa_ie);
 794         /* can't switch to destination channel, fail */
 795         if (err < 0)
 796                 goto disconnect;
 797
 798         /* did not contain a CSA */
 799         if (err)
 800                 return false;
 801
 802         /* channel switch is not supported, disconnect */
 803         if (!(sdata->local->hw.wiphy->flags & WIPHY_FLAG_HAS_CHANNEL_SWITCH))
 804                 goto disconnect;
 805
 806         params.count = csa_ie.count;
 807         params.chandef = csa_ie.chandef;
 808
 809         switch (ifibss->chandef.width) {
 810         case NL80211_CHAN_WIDTH_20_NOHT:
 811         case NL80211_CHAN_WIDTH_20:
 812         case NL80211_CHAN_WIDTH_40:
 813                 /* keep our current HT mode (HT20/HT40+/HT40-), even if
 814                  * another mode  has been announced. The mode is not adopted
 815                  * within the beacon while doing CSA and we should therefore
 816                  * keep the mode which we announce.
 817                  */
 818                 ch_type = cfg80211_get_chandef_type(&ifibss->chandef);
 819                 cfg80211_chandef_create(&params.chandef, params.chandef.chan,
 820                                         ch_type);
 821                 break;
 822         case NL80211_CHAN_WIDTH_5:
 823         case NL80211_CHAN_WIDTH_10:
 824                 if (params.chandef.width != ifibss->chandef.width) {
 825                         sdata_info(sdata,
 826                                    "IBSS %pM received channel switch from incompatible channel width (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
 827                                    ifibss->bssid,
 828                                    params.chandef.chan->center_freq,
 829                                    params.chandef.width,
 830                                    params.chandef.center_freq1,
 831                                    params.chandef.center_freq2);
 832                         goto disconnect;
 833                 }
 834                 break;
 835         default:
 836                 /* should not happen, sta_flags should prevent VHT modes. */
 837                 WARN_ON(1);
 838                 goto disconnect;
 839         }
 840
 841         if (!cfg80211_reg_can_beacon(sdata->local->hw.wiphy, &params.chandef,
 842                                      NL80211_IFTYPE_ADHOC)) {
 843                 sdata_info(sdata,
 844                            "IBSS %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
 845                            ifibss->bssid,
 846                            params.chandef.chan->center_freq,
 847                            params.chandef.width,
 848                            params.chandef.center_freq1,
 849                            params.chandef.center_freq2);
 850                 goto disconnect;
 851         }
 852
 853         err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
 854                                             &params.chandef,
 855                                             NL80211_IFTYPE_ADHOC);
 856         if (err < 0)
 857                 goto disconnect;
 858         if (err > 0 && !ifibss->userspace_handles_dfs) {
 859                 /* IBSS-DFS only allowed with a control program */
 860                 goto disconnect;
 861         }
 862
 863         params.radar_required = err;
 864
 865         if (cfg80211_chandef_identical(&params.chandef,
 866                                        &sdata->vif.bss_conf.chandef)) {
 867                 ibss_dbg(sdata,
 868                          "received csa with an identical chandef, ignoring\n");
 869                 return true;
 870         }
 871
 872         /* all checks done, now perform the channel switch. */
 873         ibss_dbg(sdata,
 874                  "received channel switch announcement to go to channel %d MHz\n",
 875                  params.chandef.chan->center_freq);
 876
 877         params.block_tx = !!csa_ie.mode;
 878
 879         if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev,
 880                                      &params))
 881                 goto disconnect;
 882
 883         ieee80211_ibss_csa_mark_radar(sdata);
 884
 885         return true;
 886 disconnect:
 887         ibss_dbg(sdata, "Can't handle channel switch, disconnect\n");
 888         ieee80211_queue_work(&sdata->local->hw,
 889                              &ifibss->csa_connection_drop_work);
 890
 891         ieee80211_ibss_csa_mark_radar(sdata);
 892
 893         return true;
 894 }
 895
 896 static void
 897 ieee80211_rx_mgmt_spectrum_mgmt(struct ieee80211_sub_if_data *sdata,
 898                                 struct ieee80211_mgmt *mgmt, size_t len,
 899                                 struct ieee80211_rx_status *rx_status,
 900                                 struct ieee802_11_elems *elems)
 901 {
 902         int required_len;
 903
 904         if (len < IEEE80211_MIN_ACTION_SIZE + 1)
 905                 return;
 906
 907         /* CSA is the only action we handle for now */
 908         if (mgmt->u.action.u.measurement.action_code !=
 909             WLAN_ACTION_SPCT_CHL_SWITCH)
 910                 return;
 911
 912         required_len = IEEE80211_MIN_ACTION_SIZE +
 913                        sizeof(mgmt->u.action.u.chan_switch);
 914         if (len < required_len)
 915                 return;
 916
 917         if (!sdata->vif.csa_active)
 918                 ieee80211_ibss_process_chanswitch(sdata, elems, false);
 919 }
 920
 921 static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data *sdata,
 922                                           struct ieee80211_mgmt *mgmt,
 923                                           size_t len)
 924 {
 925         u16 reason = le16_to_cpu(mgmt->u.deauth.reason_code);
 926
 927         if (len < IEEE80211_DEAUTH_FRAME_LEN)
 928                 return;
 929
 930         ibss_dbg(sdata, "RX DeAuth SA=%pM DA=%pM BSSID=%pM (reason: %d)\n",
 931                  mgmt->sa, mgmt->da, mgmt->bssid, reason);
 932         sta_info_destroy_addr(sdata, mgmt->sa);
 933 }
 934
 935 static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata,
 936                                         struct ieee80211_mgmt *mgmt,
 937                                         size_t len)
 938 {
 939         u16 auth_alg, auth_transaction;
 940
 941         sdata_assert_lock(sdata);
 942
 943         if (len < 24 + 6)
 944                 return;
 945
 946         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
 947         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
 948
 949         ibss_dbg(sdata,
 950                  "RX Auth SA=%pM DA=%pM BSSID=%pM (auth_transaction=%d)\n",
 951                  mgmt->sa, mgmt->da, mgmt->bssid, auth_transaction);
 952
 953         if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
 954                 return;
 955
 956         /*
 957          * IEEE 802.11 standard does not require authentication in IBSS
 958          * networks and most implementations do not seem to use it.
 959          * However, try to reply to authentication attempts if someone
 960          * has actually implemented this.
 961          */
 962         ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, 0, NULL, 0,
 963                             mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0, 0);
 964 }
 965
 966 static void ieee80211_update_sta_info(struct ieee80211_sub_if_data *sdata,
 967                                       struct ieee80211_mgmt *mgmt, size_t len,
 968                                       struct ieee80211_rx_status *rx_status,
 969                                       struct ieee802_11_elems *elems,
 970                                       struct ieee80211_channel *channel)
 971 {
 972         struct sta_info *sta;
 973         enum ieee80211_band band = rx_status->band;
 974         enum nl80211_bss_scan_width scan_width;
 975         struct ieee80211_local *local = sdata->local;
 976         struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band];
 977         bool rates_updated = false;
 978         u32 supp_rates = 0;
 979
 980         if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
 981                 return;
 982
 983         if (!ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid))
 984                 return;
 985
 986         rcu_read_lock();
 987         sta = sta_info_get(sdata, mgmt->sa);
 988
 989         if (elems->supp_rates) {
 990                 supp_rates = ieee80211_sta_get_rates(sdata, elems,
 991                                                      band, NULL);
 992                 if (sta) {
 993                         u32 prev_rates;
 994
 995                         prev_rates = sta->sta.supp_rates[band];
 996                         /* make sure mandatory rates are always added */
 997                         scan_width = NL80211_BSS_CHAN_WIDTH_20;
 998                         if (rx_status->flag & RX_FLAG_5MHZ)
 999                                 scan_width = NL80211_BSS_CHAN_WIDTH_5;
1000                         if (rx_status->flag & RX_FLAG_10MHZ)
1001                                 scan_width = NL80211_BSS_CHAN_WIDTH_10;
1002
1003                         sta->sta.supp_rates[band] = supp_rates |
1004                                 ieee80211_mandatory_rates(sband, scan_width);
1005                         if (sta->sta.supp_rates[band] != prev_rates) {
1006                                 ibss_dbg(sdata,
1007                                          "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n",
1008                                          sta->sta.addr, prev_rates,
1009                                          sta->sta.supp_rates[band]);
1010                                 rates_updated = true;
1011                         }
1012                 } else {
1013                         rcu_read_unlock();
1014                         sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid,
1015                                                      mgmt->sa, supp_rates);
1016                 }
1017         }
1018
1019         if (sta && elems->wmm_info && local->hw.queues >= IEEE80211_NUM_ACS)
1020                 sta->sta.wme = true;
1021
1022         if (sta && elems->ht_operation && elems->ht_cap_elem &&
1023             sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20_NOHT &&
1024             sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_5 &&
1025             sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_10) {
1026                 /* we both use HT */
1027                 struct ieee80211_ht_cap htcap_ie;
1028                 struct cfg80211_chan_def chandef;
1029
1030                 ieee80211_ht_oper_to_chandef(channel,
1031                                              elems->ht_operation,
1032                                              &chandef);
1033
1034                 memcpy(&htcap_ie, elems->ht_cap_elem, sizeof(htcap_ie));
1035
1036                 /*
1037                  * fall back to HT20 if we don't use or use
1038                  * the other extension channel
1039                  */
1040                 if (chandef.center_freq1 != sdata->u.ibss.chandef.center_freq1)
1041                         htcap_ie.cap_info &=
1042                                 cpu_to_le16(~IEEE80211_HT_CAP_SUP_WIDTH_20_40);
1043
1044                 rates_updated |= ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
1045                                                                    &htcap_ie,
1046                                                                    sta);
1047         }
1048
1049         if (sta && rates_updated) {
1050                 u32 changed = IEEE80211_RC_SUPP_RATES_CHANGED;
1051                 u8 rx_nss = sta->sta.rx_nss;
1052
1053                 /* Force rx_nss recalculation */
1054                 sta->sta.rx_nss = 0;
1055                 rate_control_rate_init(sta);
1056                 if (sta->sta.rx_nss != rx_nss)
1057                         changed |= IEEE80211_RC_NSS_CHANGED;
1058
1059                 drv_sta_rc_update(local, sdata, &sta->sta, changed);
1060         }
1061
1062         rcu_read_unlock();
1063 }
1064
1065 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1066                                   struct ieee80211_mgmt *mgmt, size_t len,
1067                                   struct ieee80211_rx_status *rx_status,
1068                                   struct ieee802_11_elems *elems)
1069 {
1070         struct ieee80211_local *local = sdata->local;
1071         struct cfg80211_bss *cbss;
1072         struct ieee80211_bss *bss;
1073         struct ieee80211_channel *channel;
1074         u64 beacon_timestamp, rx_timestamp;
1075         u32 supp_rates = 0;
1076         enum ieee80211_band band = rx_status->band;
1077
1078         channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
1079         if (!channel)
1080                 return;
1081
1082         ieee80211_update_sta_info(sdata, mgmt, len, rx_status, elems, channel);
1083
1084         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1085                                         channel);
1086         if (!bss)
1087                 return;
1088
1089         cbss = container_of((void *)bss, struct cfg80211_bss, priv);
1090
1091         /* same for beacon and probe response */
1092         beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp);
1093
1094         /* check if we need to merge IBSS */
1095
1096         /* not an IBSS */
1097         if (!(cbss->capability & WLAN_CAPABILITY_IBSS))
1098                 goto put_bss;
1099
1100         /* different channel */
1101         if (sdata->u.ibss.fixed_channel &&
1102             sdata->u.ibss.chandef.chan != cbss->channel)
1103                 goto put_bss;
1104
1105         /* different SSID */
1106         if (elems->ssid_len != sdata->u.ibss.ssid_len ||
1107             memcmp(elems->ssid, sdata->u.ibss.ssid,
1108                                 sdata->u.ibss.ssid_len))
1109                 goto put_bss;
1110
1111         /* process channel switch */
1112         if (sdata->vif.csa_active ||
1113             ieee80211_ibss_process_chanswitch(sdata, elems, true))
1114                 goto put_bss;
1115
1116         /* same BSSID */
1117         if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid))
1118                 goto put_bss;
1119
1120         /* we use a fixed BSSID */
1121         if (sdata->u.ibss.fixed_bssid)
1122                 goto put_bss;
1123
1124         if (ieee80211_have_rx_timestamp(rx_status)) {
1125                 /* time when timestamp field was received */
1126                 rx_timestamp =
1127                         ieee80211_calculate_rx_timestamp(local, rx_status,
1128                                                          len + FCS_LEN, 24);
1129         } else {
1130                 /*
1131                  * second best option: get current TSF
1132                  * (will return -1 if not supported)
1133                  */
1134                 rx_timestamp = drv_get_tsf(local, sdata);
1135         }
1136
1137         ibss_dbg(sdata,
1138                  "RX beacon SA=%pM BSSID=%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
1139                  mgmt->sa, mgmt->bssid,
1140                  (unsigned long long)rx_timestamp,
1141                  (unsigned long long)beacon_timestamp,
1142                  (unsigned long long)(rx_timestamp - beacon_timestamp),
1143                  jiffies);
1144
1145         if (beacon_timestamp > rx_timestamp) {
1146                 ibss_dbg(sdata,
1147                          "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n",
1148                          mgmt->bssid);
1149                 ieee80211_sta_join_ibss(sdata, bss);
1150                 supp_rates = ieee80211_sta_get_rates(sdata, elems, band, NULL);
1151                 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa,
1152                                        supp_rates);
1153                 rcu_read_unlock();
1154         }
1155
1156  put_bss:
1157         ieee80211_rx_bss_put(local, bss);
1158 }
1159
1160 void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata,
1161                               const u8 *bssid, const u8 *addr,
1162                               u32 supp_rates)
1163 {
1164         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1165         struct ieee80211_local *local = sdata->local;
1166         struct sta_info *sta;
1167         struct ieee80211_chanctx_conf *chanctx_conf;
1168         struct ieee80211_supported_band *sband;
1169         enum nl80211_bss_scan_width scan_width;
1170         int band;
1171
1172         /*
1173          * XXX: Consider removing the least recently used entry and
1174          *      allow new one to be added.
1175          */
1176         if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
1177                 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
1178                                     sdata->name, addr);
1179                 return;
1180         }
1181
1182         if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH)
1183                 return;
1184
1185         if (!ether_addr_equal(bssid, sdata->u.ibss.bssid))
1186                 return;
1187
1188         rcu_read_lock();
1189         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1190         if (WARN_ON_ONCE(!chanctx_conf)) {
1191                 rcu_read_unlock();
1192                 return;
1193         }
1194         band = chanctx_conf->def.chan->band;
1195         scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
1196         rcu_read_unlock();
1197
1198         sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
1199         if (!sta)
1200                 return;
1201
1202         sta->last_rx = jiffies;
1203
1204         /* make sure mandatory rates are always added */
1205         sband = local->hw.wiphy->bands[band];
1206         sta->sta.supp_rates[band] = supp_rates |
1207                         ieee80211_mandatory_rates(sband, scan_width);
1208
1209         spin_lock(&ifibss->incomplete_lock);
1210         list_add(&sta->list, &ifibss->incomplete_stations);
1211         spin_unlock(&ifibss->incomplete_lock);
1212         ieee80211_queue_work(&local->hw, &sdata->work);
1213 }
1214
1215 static void ieee80211_ibss_sta_expire(struct ieee80211_sub_if_data *sdata)
1216 {
1217         struct ieee80211_local *local = sdata->local;
1218         struct sta_info *sta, *tmp;
1219         unsigned long exp_time = IEEE80211_IBSS_INACTIVITY_LIMIT;
1220         unsigned long exp_rsn_time = IEEE80211_IBSS_RSN_INACTIVITY_LIMIT;
1221
1222         mutex_lock(&local->sta_mtx);
1223
1224         list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
1225                 if (sdata != sta->sdata)
1226                         continue;
1227
1228                 if (time_after(jiffies, sta->last_rx + exp_time) ||
1229                     (time_after(jiffies, sta->last_rx + exp_rsn_time) &&
1230                      sta->sta_state != IEEE80211_STA_AUTHORIZED)) {
1231                         sta_dbg(sta->sdata, "expiring inactive %sSTA %pM\n",
1232                                 sta->sta_state != IEEE80211_STA_AUTHORIZED ?
1233                                 "not authorized " : "", sta->sta.addr);
1234
1235                         WARN_ON(__sta_info_destroy(sta));
1236                 }
1237         }
1238
1239         mutex_unlock(&local->sta_mtx);
1240 }
1241
1242 /*
1243  * This function is called with state == IEEE80211_IBSS_MLME_JOINED
1244  */
1245
1246 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
1247 {
1248         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1249         enum nl80211_bss_scan_width scan_width;
1250
1251         sdata_assert_lock(sdata);
1252
1253         mod_timer(&ifibss->timer,
1254                   round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
1255
1256         ieee80211_ibss_sta_expire(sdata);
1257
1258         if (time_before(jiffies, ifibss->last_scan_completed +
1259                        IEEE80211_IBSS_MERGE_INTERVAL))
1260                 return;
1261
1262         if (ieee80211_sta_active_ibss(sdata))
1263                 return;
1264
1265         if (ifibss->fixed_channel)
1266                 return;
1267
1268         sdata_info(sdata,
1269                    "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n");
1270
1271         scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
1272         ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len,
1273                                     NULL, 0, scan_width);
1274 }
1275
1276 static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
1277 {
1278         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1279         u8 bssid[ETH_ALEN];
1280         u16 capability;
1281         int i;
1282
1283         sdata_assert_lock(sdata);
1284
1285         if (ifibss->fixed_bssid) {
1286                 memcpy(bssid, ifibss->bssid, ETH_ALEN);
1287         } else {
1288                 /* Generate random, not broadcast, locally administered BSSID. Mix in
1289                  * own MAC address to make sure that devices that do not have proper
1290                  * random number generator get different BSSID. */
1291                 get_random_bytes(bssid, ETH_ALEN);
1292                 for (i = 0; i < ETH_ALEN; i++)
1293                         bssid[i] ^= sdata->vif.addr[i];
1294                 bssid[0] &= ~0x01;
1295                 bssid[0] |= 0x02;
1296         }
1297
1298         sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid);
1299
1300         capability = WLAN_CAPABILITY_IBSS;
1301
1302         if (ifibss->privacy)
1303                 capability |= WLAN_CAPABILITY_PRIVACY;
1304
1305         __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int,
1306                                   &ifibss->chandef, ifibss->basic_rates,
1307                                   capability, 0, true);
1308 }
1309
1310 static unsigned ibss_setup_channels(struct wiphy *wiphy,
1311                                     struct ieee80211_channel **channels,
1312                                     unsigned int channels_max,
1313                                     u32 center_freq, u32 width)
1314 {
1315         struct ieee80211_channel *chan = NULL;
1316         unsigned int n_chan = 0;
1317         u32 start_freq, end_freq, freq;
1318
1319         if (width <= 20) {
1320                 start_freq = center_freq;
1321                 end_freq = center_freq;
1322         } else {
1323                 start_freq = center_freq - width / 2 + 10;
1324                 end_freq = center_freq + width / 2 - 10;
1325         }
1326
1327         for (freq = start_freq; freq <= end_freq; freq += 20) {
1328                 chan = ieee80211_get_channel(wiphy, freq);
1329                 if (!chan)
1330                         continue;
1331                 if (n_chan >= channels_max)
1332                         return n_chan;
1333
1334                 channels[n_chan] = chan;
1335                 n_chan++;
1336         }
1337
1338         return n_chan;
1339 }
1340
1341 static unsigned int
1342 ieee80211_ibss_setup_scan_channels(struct wiphy *wiphy,
1343                                    const struct cfg80211_chan_def *chandef,
1344                                    struct ieee80211_channel **channels,
1345                                    unsigned int channels_max)
1346 {
1347         unsigned int n_chan = 0;
1348         u32 width, cf1, cf2 = 0;
1349
1350         switch (chandef->width) {
1351         case NL80211_CHAN_WIDTH_40:
1352                 width = 40;
1353                 break;
1354         case NL80211_CHAN_WIDTH_80P80:
1355                 cf2 = chandef->center_freq2;
1356                 /* fall through */
1357         case NL80211_CHAN_WIDTH_80:
1358                 width = 80;
1359                 break;
1360         case NL80211_CHAN_WIDTH_160:
1361                 width = 160;
1362                 break;
1363         default:
1364                 width = 20;
1365                 break;
1366         }
1367
1368         cf1 = chandef->center_freq1;
1369
1370         n_chan = ibss_setup_channels(wiphy, channels, channels_max, cf1, width);
1371
1372         if (cf2)
1373                 n_chan += ibss_setup_channels(wiphy, &channels[n_chan],
1374                                               channels_max - n_chan, cf2,
1375                                               width);
1376
1377         return n_chan;
1378 }
1379
1380 /*
1381  * This function is called with state == IEEE80211_IBSS_MLME_SEARCH
1382  */
1383
1384 static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
1385 {
1386         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1387         struct ieee80211_local *local = sdata->local;
1388         struct cfg80211_bss *cbss;
1389         struct ieee80211_channel *chan = NULL;
1390         const u8 *bssid = NULL;
1391         enum nl80211_bss_scan_width scan_width;
1392         int active_ibss;
1393
1394         sdata_assert_lock(sdata);
1395
1396         active_ibss = ieee80211_sta_active_ibss(sdata);
1397         ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss);
1398
1399         if (active_ibss)
1400                 return;
1401
1402         if (ifibss->fixed_bssid)
1403                 bssid = ifibss->bssid;
1404         if (ifibss->fixed_channel)
1405                 chan = ifibss->chandef.chan;
1406         if (!is_zero_ether_addr(ifibss->bssid))
1407                 bssid = ifibss->bssid;
1408         cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid,
1409                                 ifibss->ssid, ifibss->ssid_len,
1410                                 IEEE80211_BSS_TYPE_IBSS,
1411                                 IEEE80211_PRIVACY(ifibss->privacy));
1412
1413         if (cbss) {
1414                 struct ieee80211_bss *bss;
1415
1416                 bss = (void *)cbss->priv;
1417                 ibss_dbg(sdata,
1418                          "sta_find_ibss: selected %pM current %pM\n",
1419                          cbss->bssid, ifibss->bssid);
1420                 sdata_info(sdata,
1421                            "Selected IBSS BSSID %pM based on configured SSID\n",
1422                            cbss->bssid);
1423
1424                 ieee80211_sta_join_ibss(sdata, bss);
1425                 ieee80211_rx_bss_put(local, bss);
1426                 return;
1427         }
1428
1429         /* if a fixed bssid and a fixed freq have been provided create the IBSS
1430          * directly and do not waste time scanning
1431          */
1432         if (ifibss->fixed_bssid && ifibss->fixed_channel) {
1433                 sdata_info(sdata, "Created IBSS using preconfigured BSSID %pM\n",
1434                            bssid);
1435                 ieee80211_sta_create_ibss(sdata);
1436                 return;
1437         }
1438
1439
1440         ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n");
1441
1442         /* Selected IBSS not found in current scan results - try to scan */
1443         if (time_after(jiffies, ifibss->last_scan_completed +
1444                                         IEEE80211_SCAN_INTERVAL)) {
1445                 struct ieee80211_channel *channels[8];
1446                 unsigned int num;
1447
1448                 sdata_info(sdata, "Trigger new scan to find an IBSS to join\n");
1449
1450                 num = ieee80211_ibss_setup_scan_channels(local->hw.wiphy,
1451                                                          &ifibss->chandef,
1452                                                          channels,
1453                                                          ARRAY_SIZE(channels));
1454                 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
1455                 ieee80211_request_ibss_scan(sdata, ifibss->ssid,
1456                                             ifibss->ssid_len, channels, num,
1457                                             scan_width);
1458         } else {
1459                 int interval = IEEE80211_SCAN_INTERVAL;
1460
1461                 if (time_after(jiffies, ifibss->ibss_join_req +
1462                                IEEE80211_IBSS_JOIN_TIMEOUT))
1463                         ieee80211_sta_create_ibss(sdata);
1464
1465                 mod_timer(&ifibss->timer,
1466                           round_jiffies(jiffies + interval));
1467         }
1468 }
1469
1470 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
1471                                         struct sk_buff *req)
1472 {
1473         struct ieee80211_mgmt *mgmt = (void *)req->data;
1474         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1475         struct ieee80211_local *local = sdata->local;
1476         int tx_last_beacon, len = req->len;
1477         struct sk_buff *skb;
1478         struct beacon_data *presp;
1479         u8 *pos, *end;
1480
1481         sdata_assert_lock(sdata);
1482
1483         presp = rcu_dereference_protected(ifibss->presp,
1484                                           lockdep_is_held(&sdata->wdev.mtx));
1485
1486         if (ifibss->state != IEEE80211_IBSS_MLME_JOINED ||
1487             len < 24 + 2 || !presp)
1488                 return;
1489
1490         tx_last_beacon = drv_tx_last_beacon(local);
1491
1492         ibss_dbg(sdata,
1493                  "RX ProbeReq SA=%pM DA=%pM BSSID=%pM (tx_last_beacon=%d)\n",
1494                  mgmt->sa, mgmt->da, mgmt->bssid, tx_last_beacon);
1495
1496         if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da))
1497                 return;
1498
1499         if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) &&
1500             !is_broadcast_ether_addr(mgmt->bssid))
1501                 return;
1502
1503         end = ((u8 *) mgmt) + len;
1504         pos = mgmt->u.probe_req.variable;
1505         if (pos[0] != WLAN_EID_SSID ||
1506             pos + 2 + pos[1] > end) {
1507                 ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n",
1508                          mgmt->sa);
1509                 return;
1510         }
1511         if (pos[1] != 0 &&
1512             (pos[1] != ifibss->ssid_len ||
1513              memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) {
1514                 /* Ignore ProbeReq for foreign SSID */
1515                 return;
1516         }
1517
1518         /* Reply with ProbeResp */
1519         skb = dev_alloc_skb(local->tx_headroom + presp->head_len);
1520         if (!skb)
1521                 return;
1522
1523         skb_reserve(skb, local->tx_headroom);
1524         memcpy(skb_put(skb, presp->head_len), presp->head, presp->head_len);
1525
1526         memcpy(((struct ieee80211_mgmt *) skb->data)->da, mgmt->sa, ETH_ALEN);
1527         ibss_dbg(sdata, "Sending ProbeResp to %pM\n", mgmt->sa);
1528         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1529
1530         /* avoid excessive retries for probe request to wildcard SSIDs */
1531         if (pos[1] == 0)
1532                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_NO_ACK;
1533
1534         ieee80211_tx_skb(sdata, skb);
1535 }
1536
1537 static
1538 void ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data *sdata,
1539                                     struct ieee80211_mgmt *mgmt, size_t len,
1540                                     struct ieee80211_rx_status *rx_status)
1541 {
1542         size_t baselen;
1543         struct ieee802_11_elems elems;
1544
1545         BUILD_BUG_ON(offsetof(typeof(mgmt->u.probe_resp), variable) !=
1546                      offsetof(typeof(mgmt->u.beacon), variable));
1547
1548         /*
1549          * either beacon or probe_resp but the variable field is at the
1550          * same offset
1551          */
1552         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1553         if (baselen > len)
1554                 return;
1555
1556         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1557                                false, &elems);
1558
1559         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
1560 }
1561
1562 void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1563                                    struct sk_buff *skb)
1564 {
1565         struct ieee80211_rx_status *rx_status;
1566         struct ieee80211_mgmt *mgmt;
1567         u16 fc;
1568         struct ieee802_11_elems elems;
1569         int ies_len;
1570
1571         rx_status = IEEE80211_SKB_RXCB(skb);
1572         mgmt = (struct ieee80211_mgmt *) skb->data;
1573         fc = le16_to_cpu(mgmt->frame_control);
1574
1575         sdata_lock(sdata);
1576
1577         if (!sdata->u.ibss.ssid_len)
1578                 goto mgmt_out; /* not ready to merge yet */
1579
1580         switch (fc & IEEE80211_FCTL_STYPE) {
1581         case IEEE80211_STYPE_PROBE_REQ:
1582                 ieee80211_rx_mgmt_probe_req(sdata, skb);
1583                 break;
1584         case IEEE80211_STYPE_PROBE_RESP:
1585         case IEEE80211_STYPE_BEACON:
1586                 ieee80211_rx_mgmt_probe_beacon(sdata, mgmt, skb->len,
1587                                                rx_status);
1588                 break;
1589         case IEEE80211_STYPE_AUTH:
1590                 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len);
1591                 break;
1592         case IEEE80211_STYPE_DEAUTH:
1593                 ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len);
1594                 break;
1595         case IEEE80211_STYPE_ACTION:
1596                 switch (mgmt->u.action.category) {
1597                 case WLAN_CATEGORY_SPECTRUM_MGMT:
1598                         ies_len = skb->len -
1599                                   offsetof(struct ieee80211_mgmt,
1600                                            u.action.u.chan_switch.variable);
1601
1602                         if (ies_len < 0)
1603                                 break;
1604
1605                         ieee802_11_parse_elems(
1606                                 mgmt->u.action.u.chan_switch.variable,
1607                                 ies_len, true, &elems);
1608
1609                         if (elems.parse_error)
1610                                 break;
1611
1612                         ieee80211_rx_mgmt_spectrum_mgmt(sdata, mgmt, skb->len,
1613                                                         rx_status, &elems);
1614                         break;
1615                 }
1616         }
1617
1618  mgmt_out:
1619         sdata_unlock(sdata);
1620 }
1621
1622 void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata)
1623 {
1624         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1625         struct sta_info *sta;
1626
1627         sdata_lock(sdata);
1628
1629         /*
1630          * Work could be scheduled after scan or similar
1631          * when we aren't even joined (or trying) with a
1632          * network.
1633          */
1634         if (!ifibss->ssid_len)
1635                 goto out;
1636
1637         spin_lock_bh(&ifibss->incomplete_lock);
1638         while (!list_empty(&ifibss->incomplete_stations)) {
1639                 sta = list_first_entry(&ifibss->incomplete_stations,
1640                                        struct sta_info, list);
1641                 list_del(&sta->list);
1642                 spin_unlock_bh(&ifibss->incomplete_lock);
1643
1644                 ieee80211_ibss_finish_sta(sta);
1645                 rcu_read_unlock();
1646                 spin_lock_bh(&ifibss->incomplete_lock);
1647         }
1648         spin_unlock_bh(&ifibss->incomplete_lock);
1649
1650         switch (ifibss->state) {
1651         case IEEE80211_IBSS_MLME_SEARCH:
1652                 ieee80211_sta_find_ibss(sdata);
1653                 break;
1654         case IEEE80211_IBSS_MLME_JOINED:
1655                 ieee80211_sta_merge_ibss(sdata);
1656                 break;
1657         default:
1658                 WARN_ON(1);
1659                 break;
1660         }
1661
1662  out:
1663         sdata_unlock(sdata);
1664 }
1665
1666 static void ieee80211_ibss_timer(unsigned long data)
1667 {
1668         struct ieee80211_sub_if_data *sdata =
1669                 (struct ieee80211_sub_if_data *) data;
1670
1671         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1672 }
1673
1674 void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata)
1675 {
1676         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1677
1678         setup_timer(&ifibss->timer, ieee80211_ibss_timer,
1679                     (unsigned long) sdata);
1680         INIT_LIST_HEAD(&ifibss->incomplete_stations);
1681         spin_lock_init(&ifibss->incomplete_lock);
1682         INIT_WORK(&ifibss->csa_connection_drop_work,
1683                   ieee80211_csa_connection_drop_work);
1684 }
1685
1686 /* scan finished notification */
1687 void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local)
1688 {
1689         struct ieee80211_sub_if_data *sdata;
1690
1691         mutex_lock(&local->iflist_mtx);
1692         list_for_each_entry(sdata, &local->interfaces, list) {
1693                 if (!ieee80211_sdata_running(sdata))
1694                         continue;
1695                 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
1696                         continue;
1697                 sdata->u.ibss.last_scan_completed = jiffies;
1698                 ieee80211_queue_work(&local->hw, &sdata->work);
1699         }
1700         mutex_unlock(&local->iflist_mtx);
1701 }
1702
1703 int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
1704                         struct cfg80211_ibss_params *params)
1705 {
1706         u32 changed = 0;
1707         u32 rate_flags;
1708         struct ieee80211_supported_band *sband;
1709         enum ieee80211_chanctx_mode chanmode;
1710         struct ieee80211_local *local = sdata->local;
1711         int radar_detect_width = 0;
1712         int i;
1713         int ret;
1714
1715         ret = cfg80211_chandef_dfs_required(local->hw.wiphy,
1716                                             &params->chandef,
1717                                             sdata->wdev.iftype);
1718         if (ret < 0)
1719                 return ret;
1720
1721         if (ret > 0) {
1722                 if (!params->userspace_handles_dfs)
1723                         return -EINVAL;
1724                 radar_detect_width = BIT(params->chandef.width);
1725         }
1726
1727         chanmode = (params->channel_fixed && !ret) ?
1728                 IEEE80211_CHANCTX_SHARED : IEEE80211_CHANCTX_EXCLUSIVE;
1729
1730         mutex_lock(&local->chanctx_mtx);
1731         ret = ieee80211_check_combinations(sdata, &params->chandef, chanmode,
1732                                            radar_detect_width);
1733         mutex_unlock(&local->chanctx_mtx);
1734         if (ret < 0)
1735                 return ret;
1736
1737         if (params->bssid) {
1738                 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN);
1739                 sdata->u.ibss.fixed_bssid = true;
1740         } else
1741                 sdata->u.ibss.fixed_bssid = false;
1742
1743         sdata->u.ibss.privacy = params->privacy;
1744         sdata->u.ibss.control_port = params->control_port;
1745         sdata->u.ibss.userspace_handles_dfs = params->userspace_handles_dfs;
1746         sdata->u.ibss.basic_rates = params->basic_rates;
1747         sdata->u.ibss.last_scan_completed = jiffies;
1748
1749         /* fix basic_rates if channel does not support these rates */
1750         rate_flags = ieee80211_chandef_rate_flags(&params->chandef);
1751         sband = local->hw.wiphy->bands[params->chandef.chan->band];
1752         for (i = 0; i < sband->n_bitrates; i++) {
1753                 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
1754                         sdata->u.ibss.basic_rates &= ~BIT(i);
1755         }
1756         memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate,
1757                sizeof(params->mcast_rate));
1758
1759         sdata->vif.bss_conf.beacon_int = params->beacon_interval;
1760
1761         sdata->u.ibss.chandef = params->chandef;
1762         sdata->u.ibss.fixed_channel = params->channel_fixed;
1763
1764         if (params->ie) {
1765                 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len,
1766                                            GFP_KERNEL);
1767                 if (sdata->u.ibss.ie)
1768                         sdata->u.ibss.ie_len = params->ie_len;
1769         }
1770
1771         sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
1772         sdata->u.ibss.ibss_join_req = jiffies;
1773
1774         memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len);
1775         sdata->u.ibss.ssid_len = params->ssid_len;
1776
1777         memcpy(&sdata->u.ibss.ht_capa, &params->ht_capa,
1778                sizeof(sdata->u.ibss.ht_capa));
1779         memcpy(&sdata->u.ibss.ht_capa_mask, &params->ht_capa_mask,
1780                sizeof(sdata->u.ibss.ht_capa_mask));
1781
1782         /*
1783          * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is
1784          * reserved, but an HT STA shall protect HT transmissions as though
1785          * the HT Protection field were set to non-HT mixed mode.
1786          *
1787          * In an IBSS, the RIFS Mode field of the HT Operation element is
1788          * also reserved, but an HT STA shall operate as though this field
1789          * were set to 1.
1790          */
1791
1792         sdata->vif.bss_conf.ht_operation_mode |=
1793                   IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED
1794                 | IEEE80211_HT_PARAM_RIFS_MODE;
1795
1796         changed |= BSS_CHANGED_HT;
1797         ieee80211_bss_info_change_notify(sdata, changed);
1798
1799         sdata->smps_mode = IEEE80211_SMPS_OFF;
1800         sdata->needed_rx_chains = local->rx_chains;
1801
1802         ieee80211_queue_work(&local->hw, &sdata->work);
1803
1804         return 0;
1805 }
1806
1807 int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata)
1808 {
1809         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1810
1811         ieee80211_ibss_disconnect(sdata);
1812         ifibss->ssid_len = 0;
1813         memset(ifibss->bssid, 0, ETH_ALEN);
1814
1815         /* remove beacon */
1816         kfree(sdata->u.ibss.ie);
1817
1818         /* on the next join, re-program HT parameters */
1819         memset(&ifibss->ht_capa, 0, sizeof(ifibss->ht_capa));
1820         memset(&ifibss->ht_capa_mask, 0, sizeof(ifibss->ht_capa_mask));
1821
1822         synchronize_rcu();
1823
1824         skb_queue_purge(&sdata->skb_queue);
1825
1826         del_timer_sync(&sdata->u.ibss.timer);
1827
1828         return 0;
1829 }