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  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2 as
  12  * published by the Free Software Foundation.
  13  */
  14
  15 #include <linux/delay.h>
  16 #include <linux/slab.h>
  17 #include <linux/if_ether.h>
  18 #include <linux/skbuff.h>
  19 #include <linux/if_arp.h>
  20 #include <linux/etherdevice.h>
  21 #include <linux/rtnetlink.h>
  22 #include <net/mac80211.h>
  23
  24 #include "ieee80211_i.h"
  25 #include "driver-ops.h"
  26 #include "rate.h"
  27
  28 #define IEEE80211_SCAN_INTERVAL (2 * HZ)
  29 #define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ)
  30
  31 #define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ)
  32 #define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ)
  33 #define IEEE80211_IBSS_RSN_INACTIVITY_LIMIT (10 * HZ)
  34
  35 #define IEEE80211_IBSS_MAX_STA_ENTRIES 128
  36
  37 static struct beacon_data *
  38 ieee80211_ibss_build_presp(struct ieee80211_sub_if_data *sdata,
  39                            const int beacon_int, const u32 basic_rates,
  40                            const u16 capability, u64 tsf,
  41                            struct cfg80211_chan_def *chandef,
  42                            bool *have_higher_than_11mbit,
  43                            struct cfg80211_csa_settings *csa_settings)
  44 {
  45         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
  46         struct ieee80211_local *local = sdata->local;
  47         int rates_n = 0, i, ri;
  48         struct ieee80211_mgmt *mgmt;
  49         u8 *pos;
  50         struct ieee80211_supported_band *sband;
  51         u32 rate_flags, rates = 0, rates_added = 0;
  52         struct beacon_data *presp;
  53         int frame_len;
  54         int shift;
  55
  56         /* Build IBSS probe response */
  57         frame_len = sizeof(struct ieee80211_hdr_3addr) +
  58                     12 /* struct ieee80211_mgmt.u.beacon */ +
  59                     2 + IEEE80211_MAX_SSID_LEN /* max SSID */ +
  60                     2 + 8 /* max Supported Rates */ +
  61                     3 /* max DS params */ +
  62                     4 /* IBSS params */ +
  63                     5 /* Channel Switch Announcement */ +
  64                     2 + (IEEE80211_MAX_SUPP_RATES - 8) +
  65                     2 + sizeof(struct ieee80211_ht_cap) +
  66                     2 + sizeof(struct ieee80211_ht_operation) +
  67                     ifibss->ie_len;
  68         presp = kzalloc(sizeof(*presp) + frame_len, GFP_KERNEL);
  69         if (!presp)
  70                 return NULL;
  71
  72         presp->head = (void *)(presp + 1);
  73
  74         mgmt = (void *) presp->head;
  75         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
  76                                           IEEE80211_STYPE_PROBE_RESP);
  77         eth_broadcast_addr(mgmt->da);
  78         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
  79         memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN);
  80         mgmt->u.beacon.beacon_int = cpu_to_le16(beacon_int);
  81         mgmt->u.beacon.timestamp = cpu_to_le64(tsf);
  82         mgmt->u.beacon.capab_info = cpu_to_le16(capability);
  83
  84         pos = (u8 *)mgmt + offsetof(struct ieee80211_mgmt, u.beacon.variable);
  85
  86         *pos++ = WLAN_EID_SSID;
  87         *pos++ = ifibss->ssid_len;
  88         memcpy(pos, ifibss->ssid, ifibss->ssid_len);
  89         pos += ifibss->ssid_len;
  90
  91         sband = local->hw.wiphy->bands[chandef->chan->band];
  92         rate_flags = ieee80211_chandef_rate_flags(chandef);
  93         shift = ieee80211_chandef_get_shift(chandef);
  94         rates_n = 0;
  95         if (have_higher_than_11mbit)
  96                 *have_higher_than_11mbit = false;
  97
  98         for (i = 0; i < sband->n_bitrates; i++) {
  99                 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
 100                         continue;
 101                 if (sband->bitrates[i].bitrate > 110 &&
 102                     have_higher_than_11mbit)
 103                         *have_higher_than_11mbit = true;
 104
 105                 rates |= BIT(i);
 106                 rates_n++;
 107         }
 108
 109         *pos++ = WLAN_EID_SUPP_RATES;
 110         *pos++ = min_t(int, 8, rates_n);
 111         for (ri = 0; ri < sband->n_bitrates; ri++) {
 112                 int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate,
 113                                         5 * (1 << shift));
 114                 u8 basic = 0;
 115                 if (!(rates & BIT(ri)))
 116                         continue;
 117
 118                 if (basic_rates & BIT(ri))
 119                         basic = 0x80;
 120                 *pos++ = basic | (u8) rate;
 121                 if (++rates_added == 8) {
 122                         ri++; /* continue at next rate for EXT_SUPP_RATES */
 123                         break;
 124                 }
 125         }
 126
 127         if (sband->band == IEEE80211_BAND_2GHZ) {
 128                 *pos++ = WLAN_EID_DS_PARAMS;
 129                 *pos++ = 1;
 130                 *pos++ = ieee80211_frequency_to_channel(
 131                                 chandef->chan->center_freq);
 132         }
 133
 134         *pos++ = WLAN_EID_IBSS_PARAMS;
 135         *pos++ = 2;
 136         /* FIX: set ATIM window based on scan results */
 137         *pos++ = 0;
 138         *pos++ = 0;
 139
 140         if (csa_settings) {
 141                 *pos++ = WLAN_EID_CHANNEL_SWITCH;
 142                 *pos++ = 3;
 143                 *pos++ = csa_settings->block_tx ? 1 : 0;
 144                 *pos++ = ieee80211_frequency_to_channel(
 145                                 csa_settings->chandef.chan->center_freq);
 146                 sdata->csa_counter_offset_beacon = (pos - presp->head);
 147                 *pos++ = csa_settings->count;
 148         }
 149
 150         /* put the remaining rates in WLAN_EID_EXT_SUPP_RATES */
 151         if (rates_n > 8) {
 152                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 153                 *pos++ = rates_n - 8;
 154                 for (; ri < sband->n_bitrates; ri++) {
 155                         int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate,
 156                                                 5 * (1 << shift));
 157                         u8 basic = 0;
 158                         if (!(rates & BIT(ri)))
 159                                 continue;
 160
 161                         if (basic_rates & BIT(ri))
 162                                 basic = 0x80;
 163                         *pos++ = basic | (u8) rate;
 164                 }
 165         }
 166
 167         if (ifibss->ie_len) {
 168                 memcpy(pos, ifibss->ie, ifibss->ie_len);
 169                 pos += ifibss->ie_len;
 170         }
 171
 172         /* add HT capability and information IEs */
 173         if (chandef->width != NL80211_CHAN_WIDTH_20_NOHT &&
 174             chandef->width != NL80211_CHAN_WIDTH_5 &&
 175             chandef->width != NL80211_CHAN_WIDTH_10 &&
 176             sband->ht_cap.ht_supported) {
 177                 struct ieee80211_sta_ht_cap ht_cap;
 178
 179                 memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
 180                 ieee80211_apply_htcap_overrides(sdata, &ht_cap);
 181
 182                 pos = ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap);
 183                 /*
 184                  * Note: According to 802.11n-2009 9.13.3.1, HT Protection
 185                  * field and RIFS Mode are reserved in IBSS mode, therefore
 186                  * keep them at 0
 187                  */
 188                 pos = ieee80211_ie_build_ht_oper(pos, &sband->ht_cap,
 189                                                  chandef, 0);
 190         }
 191
 192         if (local->hw.queues >= IEEE80211_NUM_ACS) {
 193                 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
 194                 *pos++ = 7; /* len */
 195                 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
 196                 *pos++ = 0x50;
 197                 *pos++ = 0xf2;
 198                 *pos++ = 2; /* WME */
 199                 *pos++ = 0; /* WME info */
 200                 *pos++ = 1; /* WME ver */
 201                 *pos++ = 0; /* U-APSD no in use */
 202         }
 203
 204         presp->head_len = pos - presp->head;
 205         if (WARN_ON(presp->head_len > frame_len))
 206                 goto error;
 207
 208         return presp;
 209 error:
 210         kfree(presp);
 211         return NULL;
 212 }
 213
 214 static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
 215                                       const u8 *bssid, const int beacon_int,
 216                                       struct cfg80211_chan_def *req_chandef,
 217                                       const u32 basic_rates,
 218                                       const u16 capability, u64 tsf,
 219                                       bool creator)
 220 {
 221         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 222         struct ieee80211_local *local = sdata->local;
 223         struct ieee80211_supported_band *sband;
 224         struct ieee80211_mgmt *mgmt;
 225         struct cfg80211_bss *bss;
 226         u32 bss_change;
 227         struct cfg80211_chan_def chandef;
 228         struct ieee80211_channel *chan;
 229         struct beacon_data *presp;
 230         enum nl80211_bss_scan_width scan_width;
 231         bool have_higher_than_11mbit;
 232         bool radar_required = false;
 233         int err;
 234
 235         sdata_assert_lock(sdata);
 236
 237         /* Reset own TSF to allow time synchronization work. */
 238         drv_reset_tsf(local, sdata);
 239
 240         if (!ether_addr_equal(ifibss->bssid, bssid))
 241                 sta_info_flush(sdata);
 242
 243         /* if merging, indicate to driver that we leave the old IBSS */
 244         if (sdata->vif.bss_conf.ibss_joined) {
 245                 sdata->vif.bss_conf.ibss_joined = false;
 246                 sdata->vif.bss_conf.ibss_creator = false;
 247                 sdata->vif.bss_conf.enable_beacon = false;
 248                 netif_carrier_off(sdata->dev);
 249                 ieee80211_bss_info_change_notify(sdata,
 250                                                  BSS_CHANGED_IBSS |
 251                                                  BSS_CHANGED_BEACON_ENABLED);
 252                 drv_leave_ibss(local, sdata);
 253         }
 254
 255         presp = rcu_dereference_protected(ifibss->presp,
 256                                           lockdep_is_held(&sdata->wdev.mtx));
 257         rcu_assign_pointer(ifibss->presp, NULL);
 258         if (presp)
 259                 kfree_rcu(presp, rcu_head);
 260
 261         sdata->drop_unencrypted = capability & WLAN_CAPABILITY_PRIVACY ? 1 : 0;
 262
 263         /* make a copy of the chandef, it could be modified below. */
 264         chandef = *req_chandef;
 265         chan = chandef.chan;
 266         if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef)) {
 267                 if (chandef.width == NL80211_CHAN_WIDTH_5 ||
 268                     chandef.width == NL80211_CHAN_WIDTH_10 ||
 269                     chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
 270                     chandef.width == NL80211_CHAN_WIDTH_20) {
 271                         sdata_info(sdata,
 272                                    "Failed to join IBSS, beacons forbidden\n");
 273                         return;
 274                 }
 275                 chandef.width = NL80211_CHAN_WIDTH_20;
 276                 chandef.center_freq1 = chan->center_freq;
 277                 /* check again for downgraded chandef */
 278                 if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef)) {
 279                         sdata_info(sdata,
 280                                    "Failed to join IBSS, beacons forbidden\n");
 281                         return;
 282                 }
 283         }
 284
 285         err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
 286                                             &chandef);
 287         if (err > 0) {
 288                 if (!ifibss->userspace_handles_dfs) {
 289                         sdata_info(sdata,
 290                                    "Failed to join IBSS, DFS channel without control program\n");
 291                         return;
 292                 }
 293                 radar_required = true;
 294         }
 295
 296         ieee80211_vif_release_channel(sdata);
 297         if (ieee80211_vif_use_channel(sdata, &chandef,
 298                                       ifibss->fixed_channel ?
 299                                         IEEE80211_CHANCTX_SHARED :
 300                                         IEEE80211_CHANCTX_EXCLUSIVE)) {
 301                 sdata_info(sdata, "Failed to join IBSS, no channel context\n");
 302                 return;
 303         }
 304
 305         memcpy(ifibss->bssid, bssid, ETH_ALEN);
 306
 307         sband = local->hw.wiphy->bands[chan->band];
 308
 309         presp = ieee80211_ibss_build_presp(sdata, beacon_int, basic_rates,
 310                                            capability, tsf, &chandef,
 311                                            &have_higher_than_11mbit, NULL);
 312         if (!presp)
 313                 return;
 314
 315         rcu_assign_pointer(ifibss->presp, presp);
 316         mgmt = (void *)presp->head;
 317
 318         sdata->radar_required = radar_required;
 319         sdata->vif.bss_conf.enable_beacon = true;
 320         sdata->vif.bss_conf.beacon_int = beacon_int;
 321         sdata->vif.bss_conf.basic_rates = basic_rates;
 322         sdata->vif.bss_conf.ssid_len = ifibss->ssid_len;
 323         memcpy(sdata->vif.bss_conf.ssid, ifibss->ssid, ifibss->ssid_len);
 324         bss_change = BSS_CHANGED_BEACON_INT;
 325         bss_change |= ieee80211_reset_erp_info(sdata);
 326         bss_change |= BSS_CHANGED_BSSID;
 327         bss_change |= BSS_CHANGED_BEACON;
 328         bss_change |= BSS_CHANGED_BEACON_ENABLED;
 329         bss_change |= BSS_CHANGED_BASIC_RATES;
 330         bss_change |= BSS_CHANGED_HT;
 331         bss_change |= BSS_CHANGED_IBSS;
 332         bss_change |= BSS_CHANGED_SSID;
 333
 334         /*
 335          * In 5 GHz/802.11a, we can always use short slot time.
 336          * (IEEE 802.11-2012 18.3.8.7)
 337          *
 338          * In 2.4GHz, we must always use long slots in IBSS for compatibility
 339          * reasons.
 340          * (IEEE 802.11-2012 19.4.5)
 341          *
 342          * HT follows these specifications (IEEE 802.11-2012 20.3.18)
 343          */
 344         sdata->vif.bss_conf.use_short_slot = chan->band == IEEE80211_BAND_5GHZ;
 345         bss_change |= BSS_CHANGED_ERP_SLOT;
 346
 347         /* cf. IEEE 802.11 9.2.12 */
 348         if (chan->band == IEEE80211_BAND_2GHZ && have_higher_than_11mbit)
 349                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
 350         else
 351                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
 352
 353         ieee80211_set_wmm_default(sdata, true);
 354
 355         sdata->vif.bss_conf.ibss_joined = true;
 356         sdata->vif.bss_conf.ibss_creator = creator;
 357
 358         err = drv_join_ibss(local, sdata);
 359         if (err) {
 360                 sdata->vif.bss_conf.ibss_joined = false;
 361                 sdata->vif.bss_conf.ibss_creator = false;
 362                 sdata->vif.bss_conf.enable_beacon = false;
 363                 sdata->vif.bss_conf.ssid_len = 0;
 364                 RCU_INIT_POINTER(ifibss->presp, NULL);
 365                 kfree_rcu(presp, rcu_head);
 366                 ieee80211_vif_release_channel(sdata);
 367                 sdata_info(sdata, "Failed to join IBSS, driver failure: %d\n",
 368                            err);
 369                 return;
 370         }
 371
 372         ieee80211_bss_info_change_notify(sdata, bss_change);
 373
 374         ifibss->state = IEEE80211_IBSS_MLME_JOINED;
 375         mod_timer(&ifibss->timer,
 376                   round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
 377
 378         scan_width = cfg80211_chandef_to_scan_width(&chandef);
 379         bss = cfg80211_inform_bss_width_frame(local->hw.wiphy, chan,
 380                                               scan_width, mgmt,
 381                                               presp->head_len, 0, GFP_KERNEL);
 382         cfg80211_put_bss(local->hw.wiphy, bss);
 383         netif_carrier_on(sdata->dev);
 384         cfg80211_ibss_joined(sdata->dev, ifibss->bssid, GFP_KERNEL);
 385 }
 386
 387 static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
 388                                     struct ieee80211_bss *bss)
 389 {
 390         struct cfg80211_bss *cbss =
 391                 container_of((void *)bss, struct cfg80211_bss, priv);
 392         struct ieee80211_supported_band *sband;
 393         struct cfg80211_chan_def chandef;
 394         u32 basic_rates;
 395         int i, j;
 396         u16 beacon_int = cbss->beacon_interval;
 397         const struct cfg80211_bss_ies *ies;
 398         enum nl80211_channel_type chan_type;
 399         u64 tsf;
 400         u32 rate_flags;
 401         int shift;
 402
 403         sdata_assert_lock(sdata);
 404
 405         if (beacon_int < 10)
 406                 beacon_int = 10;
 407
 408         switch (sdata->u.ibss.chandef.width) {
 409         case NL80211_CHAN_WIDTH_20_NOHT:
 410         case NL80211_CHAN_WIDTH_20:
 411         case NL80211_CHAN_WIDTH_40:
 412                 chan_type = cfg80211_get_chandef_type(&sdata->u.ibss.chandef);
 413                 cfg80211_chandef_create(&chandef, cbss->channel, chan_type);
 414                 break;
 415         case NL80211_CHAN_WIDTH_5:
 416         case NL80211_CHAN_WIDTH_10:
 417                 cfg80211_chandef_create(&chandef, cbss->channel,
 418                                         NL80211_CHAN_WIDTH_20_NOHT);
 419                 chandef.width = sdata->u.ibss.chandef.width;
 420                 break;
 421         default:
 422                 /* fall back to 20 MHz for unsupported modes */
 423                 cfg80211_chandef_create(&chandef, cbss->channel,
 424                                         NL80211_CHAN_WIDTH_20_NOHT);
 425                 break;
 426         }
 427
 428         sband = sdata->local->hw.wiphy->bands[cbss->channel->band];
 429         rate_flags = ieee80211_chandef_rate_flags(&sdata->u.ibss.chandef);
 430         shift = ieee80211_vif_get_shift(&sdata->vif);
 431
 432         basic_rates = 0;
 433
 434         for (i = 0; i < bss->supp_rates_len; i++) {
 435                 int rate = bss->supp_rates[i] & 0x7f;
 436                 bool is_basic = !!(bss->supp_rates[i] & 0x80);
 437
 438                 for (j = 0; j < sband->n_bitrates; j++) {
 439                         int brate;
 440                         if ((rate_flags & sband->bitrates[j].flags)
 441                             != rate_flags)
 442                                 continue;
 443
 444                         brate = DIV_ROUND_UP(sband->bitrates[j].bitrate,
 445                                              5 * (1 << shift));
 446                         if (brate == rate) {
 447                                 if (is_basic)
 448                                         basic_rates |= BIT(j);
 449                                 break;
 450                         }
 451                 }
 452         }
 453
 454         rcu_read_lock();
 455         ies = rcu_dereference(cbss->ies);
 456         tsf = ies->tsf;
 457         rcu_read_unlock();
 458
 459         __ieee80211_sta_join_ibss(sdata, cbss->bssid,
 460                                   beacon_int,
 461                                   &chandef,
 462                                   basic_rates,
 463                                   cbss->capability,
 464                                   tsf, false);
 465 }
 466
 467 int ieee80211_ibss_csa_beacon(struct ieee80211_sub_if_data *sdata,
 468                               struct cfg80211_csa_settings *csa_settings)
 469 {
 470         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 471         struct beacon_data *presp, *old_presp;
 472         struct cfg80211_bss *cbss;
 473         const struct cfg80211_bss_ies *ies;
 474         u16 capability;
 475         u64 tsf;
 476         int ret = 0;
 477
 478         sdata_assert_lock(sdata);
 479
 480         capability = WLAN_CAPABILITY_IBSS;
 481
 482         if (ifibss->privacy)
 483                 capability |= WLAN_CAPABILITY_PRIVACY;
 484
 485         cbss = cfg80211_get_bss(sdata->local->hw.wiphy, ifibss->chandef.chan,
 486                                 ifibss->bssid, ifibss->ssid,
 487                                 ifibss->ssid_len, WLAN_CAPABILITY_IBSS |
 488                                 WLAN_CAPABILITY_PRIVACY,
 489                                 capability);
 490
 491         if (WARN_ON(!cbss)) {
 492                 ret = -EINVAL;
 493                 goto out;
 494         }
 495
 496         rcu_read_lock();
 497         ies = rcu_dereference(cbss->ies);
 498         tsf = ies->tsf;
 499         rcu_read_unlock();
 500         cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
 501
 502         old_presp = rcu_dereference_protected(ifibss->presp,
 503                                           lockdep_is_held(&sdata->wdev.mtx));
 504
 505         presp = ieee80211_ibss_build_presp(sdata,
 506                                            sdata->vif.bss_conf.beacon_int,
 507                                            sdata->vif.bss_conf.basic_rates,
 508                                            capability, tsf, &ifibss->chandef,
 509                                            NULL, csa_settings);
 510         if (!presp) {
 511                 ret = -ENOMEM;
 512                 goto out;
 513         }
 514
 515         rcu_assign_pointer(ifibss->presp, presp);
 516         if (old_presp)
 517                 kfree_rcu(old_presp, rcu_head);
 518
 519         /* it might not send the beacon for a while. send an action frame
 520          * immediately to announce the channel switch.
 521          */
 522         if (csa_settings)
 523                 ieee80211_send_action_csa(sdata, csa_settings);
 524
 525         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON);
 526  out:
 527         return ret;
 528 }
 529
 530 int ieee80211_ibss_finish_csa(struct ieee80211_sub_if_data *sdata)
 531 {
 532         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 533         struct cfg80211_bss *cbss;
 534         int err;
 535         u16 capability;
 536
 537         sdata_lock(sdata);
 538         /* update cfg80211 bss information with the new channel */
 539         if (!is_zero_ether_addr(ifibss->bssid)) {
 540                 capability = WLAN_CAPABILITY_IBSS;
 541
 542                 if (ifibss->privacy)
 543                         capability |= WLAN_CAPABILITY_PRIVACY;
 544
 545                 cbss = cfg80211_get_bss(sdata->local->hw.wiphy,
 546                                         ifibss->chandef.chan,
 547                                         ifibss->bssid, ifibss->ssid,
 548                                         ifibss->ssid_len, WLAN_CAPABILITY_IBSS |
 549                                         WLAN_CAPABILITY_PRIVACY,
 550                                         capability);
 551                 /* XXX: should not really modify cfg80211 data */
 552                 if (cbss) {
 553                         cbss->channel = sdata->local->csa_chandef.chan;
 554                         cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
 555                 }
 556         }
 557
 558         ifibss->chandef = sdata->local->csa_chandef;
 559
 560         /* generate the beacon */
 561         err = ieee80211_ibss_csa_beacon(sdata, NULL);
 562         sdata_unlock(sdata);
 563         if (err < 0)
 564                 return err;
 565
 566         return 0;
 567 }
 568
 569 void ieee80211_ibss_stop(struct ieee80211_sub_if_data *sdata)
 570 {
 571         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 572
 573         cancel_work_sync(&ifibss->csa_connection_drop_work);
 574 }
 575
 576 static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta)
 577         __acquires(RCU)
 578 {
 579         struct ieee80211_sub_if_data *sdata = sta->sdata;
 580         u8 addr[ETH_ALEN];
 581
 582         memcpy(addr, sta->sta.addr, ETH_ALEN);
 583
 584         ibss_dbg(sdata, "Adding new IBSS station %pM\n", addr);
 585
 586         sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
 587         sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
 588         /* authorize the station only if the network is not RSN protected. If
 589          * not wait for the userspace to authorize it */
 590         if (!sta->sdata->u.ibss.control_port)
 591                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
 592
 593         rate_control_rate_init(sta);
 594
 595         /* If it fails, maybe we raced another insertion? */
 596         if (sta_info_insert_rcu(sta))
 597                 return sta_info_get(sdata, addr);
 598         return sta;
 599 }
 600
 601 static struct sta_info *
 602 ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, const u8 *bssid,
 603                        const u8 *addr, u32 supp_rates)
 604         __acquires(RCU)
 605 {
 606         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 607         struct ieee80211_local *local = sdata->local;
 608         struct sta_info *sta;
 609         struct ieee80211_chanctx_conf *chanctx_conf;
 610         struct ieee80211_supported_band *sband;
 611         enum nl80211_bss_scan_width scan_width;
 612         int band;
 613
 614         /*
 615          * XXX: Consider removing the least recently used entry and
 616          *      allow new one to be added.
 617          */
 618         if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
 619                 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
 620                                     sdata->name, addr);
 621                 rcu_read_lock();
 622                 return NULL;
 623         }
 624
 625         if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) {
 626                 rcu_read_lock();
 627                 return NULL;
 628         }
 629
 630         if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) {
 631                 rcu_read_lock();
 632                 return NULL;
 633         }
 634
 635         rcu_read_lock();
 636         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 637         if (WARN_ON_ONCE(!chanctx_conf))
 638                 return NULL;
 639         band = chanctx_conf->def.chan->band;
 640         scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
 641         rcu_read_unlock();
 642
 643         sta = sta_info_alloc(sdata, addr, GFP_KERNEL);
 644         if (!sta) {
 645                 rcu_read_lock();
 646                 return NULL;
 647         }
 648
 649         sta->last_rx = jiffies;
 650
 651         /* make sure mandatory rates are always added */
 652         sband = local->hw.wiphy->bands[band];
 653         sta->sta.supp_rates[band] = supp_rates |
 654                         ieee80211_mandatory_rates(sband, scan_width);
 655
 656         return ieee80211_ibss_finish_sta(sta);
 657 }
 658
 659 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
 660 {
 661         struct ieee80211_local *local = sdata->local;
 662         int active = 0;
 663         struct sta_info *sta;
 664
 665         sdata_assert_lock(sdata);
 666
 667         rcu_read_lock();
 668
 669         list_for_each_entry_rcu(sta, &local->sta_list, list) {
 670                 if (sta->sdata == sdata &&
 671                     time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
 672                                jiffies)) {
 673                         active++;
 674                         break;
 675                 }
 676         }
 677
 678         rcu_read_unlock();
 679
 680         return active;
 681 }
 682
 683 static void ieee80211_ibss_disconnect(struct ieee80211_sub_if_data *sdata)
 684 {
 685         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 686         struct ieee80211_local *local = sdata->local;
 687         struct cfg80211_bss *cbss;
 688         struct beacon_data *presp;
 689         struct sta_info *sta;
 690         int active_ibss;
 691         u16 capability;
 692
 693         active_ibss = ieee80211_sta_active_ibss(sdata);
 694
 695         if (!active_ibss && !is_zero_ether_addr(ifibss->bssid)) {
 696                 capability = WLAN_CAPABILITY_IBSS;
 697
 698                 if (ifibss->privacy)
 699                         capability |= WLAN_CAPABILITY_PRIVACY;
 700
 701                 cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->chandef.chan,
 702                                         ifibss->bssid, ifibss->ssid,
 703                                         ifibss->ssid_len, WLAN_CAPABILITY_IBSS |
 704                                         WLAN_CAPABILITY_PRIVACY,
 705                                         capability);
 706
 707                 if (cbss) {
 708                         cfg80211_unlink_bss(local->hw.wiphy, cbss);
 709                         cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
 710                 }
 711         }
 712
 713         ifibss->state = IEEE80211_IBSS_MLME_SEARCH;
 714
 715         sta_info_flush(sdata);
 716
 717         spin_lock_bh(&ifibss->incomplete_lock);
 718         while (!list_empty(&ifibss->incomplete_stations)) {
 719                 sta = list_first_entry(&ifibss->incomplete_stations,
 720                                        struct sta_info, list);
 721                 list_del(&sta->list);
 722                 spin_unlock_bh(&ifibss->incomplete_lock);
 723
 724                 sta_info_free(local, sta);
 725                 spin_lock_bh(&ifibss->incomplete_lock);
 726         }
 727         spin_unlock_bh(&ifibss->incomplete_lock);
 728
 729         netif_carrier_off(sdata->dev);
 730
 731         sdata->vif.bss_conf.ibss_joined = false;
 732         sdata->vif.bss_conf.ibss_creator = false;
 733         sdata->vif.bss_conf.enable_beacon = false;
 734         sdata->vif.bss_conf.ssid_len = 0;
 735
 736         /* remove beacon */
 737         presp = rcu_dereference_protected(ifibss->presp,
 738                                           lockdep_is_held(&sdata->wdev.mtx));
 739         RCU_INIT_POINTER(sdata->u.ibss.presp, NULL);
 740         if (presp)
 741                 kfree_rcu(presp, rcu_head);
 742
 743         clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state);
 744         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED |
 745                                                 BSS_CHANGED_IBSS);
 746         drv_leave_ibss(local, sdata);
 747         ieee80211_vif_release_channel(sdata);
 748 }
 749
 750 static void ieee80211_csa_connection_drop_work(struct work_struct *work)
 751 {
 752         struct ieee80211_sub_if_data *sdata =
 753                 container_of(work, struct ieee80211_sub_if_data,
 754                              u.ibss.csa_connection_drop_work);
 755
 756         ieee80211_ibss_disconnect(sdata);
 757         synchronize_rcu();
 758         skb_queue_purge(&sdata->skb_queue);
 759
 760         /* trigger a scan to find another IBSS network to join */
 761         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
 762 }
 763
 764 static void ieee80211_ibss_csa_mark_radar(struct ieee80211_sub_if_data *sdata)
 765 {
 766         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 767         int err;
 768
 769         /* if the current channel is a DFS channel, mark the channel as
 770          * unavailable.
 771          */
 772         err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
 773                                             &ifibss->chandef);
 774         if (err > 0)
 775                 cfg80211_radar_event(sdata->local->hw.wiphy, &ifibss->chandef,
 776                                      GFP_ATOMIC);
 777 }
 778
 779 static bool
 780 ieee80211_ibss_process_chanswitch(struct ieee80211_sub_if_data *sdata,
 781                                   struct ieee802_11_elems *elems,
 782                                   bool beacon)
 783 {
 784         struct cfg80211_csa_settings params;
 785         struct ieee80211_csa_ie csa_ie;
 786         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 787         struct ieee80211_chanctx_conf *chanctx_conf;
 788         struct ieee80211_chanctx *chanctx;
 789         enum nl80211_channel_type ch_type;
 790         int err, num_chanctx;
 791         u32 sta_flags;
 792
 793         if (sdata->vif.csa_active)
 794                 return true;
 795
 796         if (!sdata->vif.bss_conf.ibss_joined)
 797                 return false;
 798
 799         sta_flags = IEEE80211_STA_DISABLE_VHT;
 800         switch (ifibss->chandef.width) {
 801         case NL80211_CHAN_WIDTH_5:
 802         case NL80211_CHAN_WIDTH_10:
 803         case NL80211_CHAN_WIDTH_20_NOHT:
 804                 sta_flags |= IEEE80211_STA_DISABLE_HT;
 805                 /* fall through */
 806         case NL80211_CHAN_WIDTH_20:
 807                 sta_flags |= IEEE80211_STA_DISABLE_40MHZ;
 808                 break;
 809         default:
 810                 break;
 811         }
 812
 813         memset(&params, 0, sizeof(params));
 814         memset(&csa_ie, 0, sizeof(csa_ie));
 815         err = ieee80211_parse_ch_switch_ie(sdata, elems, beacon,
 816                                            ifibss->chandef.chan->band,
 817                                            sta_flags, ifibss->bssid, &csa_ie);
 818         /* can't switch to destination channel, fail */
 819         if (err < 0)
 820                 goto disconnect;
 821
 822         /* did not contain a CSA */
 823         if (err)
 824                 return false;
 825
 826         /* channel switch is not supported, disconnect */
 827         if (!(sdata->local->hw.wiphy->flags & WIPHY_FLAG_HAS_CHANNEL_SWITCH))
 828                 goto disconnect;
 829
 830         params.count = csa_ie.count;
 831         params.chandef = csa_ie.chandef;
 832
 833         if (ifibss->chandef.chan->band != params.chandef.chan->band)
 834                 goto disconnect;
 835
 836         switch (ifibss->chandef.width) {
 837         case NL80211_CHAN_WIDTH_20_NOHT:
 838         case NL80211_CHAN_WIDTH_20:
 839         case NL80211_CHAN_WIDTH_40:
 840                 /* keep our current HT mode (HT20/HT40+/HT40-), even if
 841                  * another mode  has been announced. The mode is not adopted
 842                  * within the beacon while doing CSA and we should therefore
 843                  * keep the mode which we announce.
 844                  */
 845                 ch_type = cfg80211_get_chandef_type(&ifibss->chandef);
 846                 cfg80211_chandef_create(&params.chandef, params.chandef.chan,
 847                                         ch_type);
 848                 break;
 849         case NL80211_CHAN_WIDTH_5:
 850         case NL80211_CHAN_WIDTH_10:
 851                 if (params.chandef.width != ifibss->chandef.width) {
 852                         sdata_info(sdata,
 853                                    "IBSS %pM received channel switch from incompatible channel width (%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                 break;
 862         default:
 863                 /* should not happen, sta_flags should prevent VHT modes. */
 864                 WARN_ON(1);
 865                 goto disconnect;
 866         }
 867
 868         if (!cfg80211_reg_can_beacon(sdata->local->hw.wiphy, &params.chandef)) {
 869                 sdata_info(sdata,
 870                            "IBSS %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
 871                            ifibss->bssid,
 872                            params.chandef.chan->center_freq,
 873                            params.chandef.width,
 874                            params.chandef.center_freq1,
 875                            params.chandef.center_freq2);
 876                 goto disconnect;
 877         }
 878
 879         err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
 880                                             &params.chandef);
 881         if (err < 0)
 882                 goto disconnect;
 883         if (err) {
 884                 /* IBSS-DFS only allowed with a control program */
 885                 if (!ifibss->userspace_handles_dfs)
 886                         goto disconnect;
 887
 888                 params.radar_required = true;
 889         }
 890
 891         rcu_read_lock();
 892         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 893         if (!chanctx_conf) {
 894                 rcu_read_unlock();
 895                 goto disconnect;
 896         }
 897
 898         /* don't handle for multi-VIF cases */
 899         chanctx = container_of(chanctx_conf, struct ieee80211_chanctx, conf);
 900         if (chanctx->refcount > 1) {
 901                 rcu_read_unlock();
 902                 goto disconnect;
 903         }
 904         num_chanctx = 0;
 905         list_for_each_entry_rcu(chanctx, &sdata->local->chanctx_list, list)
 906                 num_chanctx++;
 907
 908         if (num_chanctx > 1) {
 909                 rcu_read_unlock();
 910                 goto disconnect;
 911         }
 912         rcu_read_unlock();
 913
 914         /* all checks done, now perform the channel switch. */
 915         ibss_dbg(sdata,
 916                  "received channel switch announcement to go to channel %d MHz\n",
 917                  params.chandef.chan->center_freq);
 918
 919         params.block_tx = !!csa_ie.mode;
 920
 921         ieee80211_ibss_csa_beacon(sdata, &params);
 922         sdata->csa_radar_required = params.radar_required;
 923
 924         if (params.block_tx)
 925                 ieee80211_stop_queues_by_reason(&sdata->local->hw,
 926                                 IEEE80211_MAX_QUEUE_MAP,
 927                                 IEEE80211_QUEUE_STOP_REASON_CSA);
 928
 929         sdata->local->csa_chandef = params.chandef;
 930         sdata->vif.csa_active = true;
 931
 932         ieee80211_bss_info_change_notify(sdata, err);
 933         drv_channel_switch_beacon(sdata, &params.chandef);
 934
 935         ieee80211_ibss_csa_mark_radar(sdata);
 936
 937         return true;
 938 disconnect:
 939         ibss_dbg(sdata, "Can't handle channel switch, disconnect\n");
 940         ieee80211_queue_work(&sdata->local->hw,
 941                              &ifibss->csa_connection_drop_work);
 942
 943         ieee80211_ibss_csa_mark_radar(sdata);
 944
 945         return true;
 946 }
 947
 948 static void
 949 ieee80211_rx_mgmt_spectrum_mgmt(struct ieee80211_sub_if_data *sdata,
 950                                 struct ieee80211_mgmt *mgmt, size_t len,
 951                                 struct ieee80211_rx_status *rx_status,
 952                                 struct ieee802_11_elems *elems)
 953 {
 954         int required_len;
 955
 956         if (len < IEEE80211_MIN_ACTION_SIZE + 1)
 957                 return;
 958
 959         /* CSA is the only action we handle for now */
 960         if (mgmt->u.action.u.measurement.action_code !=
 961             WLAN_ACTION_SPCT_CHL_SWITCH)
 962                 return;
 963
 964         required_len = IEEE80211_MIN_ACTION_SIZE +
 965                        sizeof(mgmt->u.action.u.chan_switch);
 966         if (len < required_len)
 967                 return;
 968
 969         ieee80211_ibss_process_chanswitch(sdata, elems, false);
 970 }
 971
 972 static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data *sdata,
 973                                           struct ieee80211_mgmt *mgmt,
 974                                           size_t len)
 975 {
 976         u16 reason = le16_to_cpu(mgmt->u.deauth.reason_code);
 977
 978         if (len < IEEE80211_DEAUTH_FRAME_LEN)
 979                 return;
 980
 981         ibss_dbg(sdata, "RX DeAuth SA=%pM DA=%pM BSSID=%pM (reason: %d)\n",
 982                  mgmt->sa, mgmt->da, mgmt->bssid, reason);
 983         sta_info_destroy_addr(sdata, mgmt->sa);
 984 }
 985
 986 static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata,
 987                                         struct ieee80211_mgmt *mgmt,
 988                                         size_t len)
 989 {
 990         u16 auth_alg, auth_transaction;
 991
 992         sdata_assert_lock(sdata);
 993
 994         if (len < 24 + 6)
 995                 return;
 996
 997         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
 998         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
 999
1000         ibss_dbg(sdata,
1001                  "RX Auth SA=%pM DA=%pM BSSID=%pM (auth_transaction=%d)\n",
1002                  mgmt->sa, mgmt->da, mgmt->bssid, auth_transaction);
1003
1004         if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
1005                 return;
1006
1007         /*
1008          * IEEE 802.11 standard does not require authentication in IBSS
1009          * networks and most implementations do not seem to use it.
1010          * However, try to reply to authentication attempts if someone
1011          * has actually implemented this.
1012          */
1013         ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, 0, NULL, 0,
1014                             mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0, 0);
1015 }
1016
1017 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1018                                   struct ieee80211_mgmt *mgmt, size_t len,
1019                                   struct ieee80211_rx_status *rx_status,
1020                                   struct ieee802_11_elems *elems)
1021 {
1022         struct ieee80211_local *local = sdata->local;
1023         int freq;
1024         struct cfg80211_bss *cbss;
1025         struct ieee80211_bss *bss;
1026         struct sta_info *sta;
1027         struct ieee80211_channel *channel;
1028         u64 beacon_timestamp, rx_timestamp;
1029         u32 supp_rates = 0;
1030         enum ieee80211_band band = rx_status->band;
1031         enum nl80211_bss_scan_width scan_width;
1032         struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band];
1033         bool rates_updated = false;
1034
1035         if (elems->ds_params)
1036                 freq = ieee80211_channel_to_frequency(elems->ds_params[0],
1037                                                       band);
1038         else
1039                 freq = rx_status->freq;
1040
1041         channel = ieee80211_get_channel(local->hw.wiphy, freq);
1042
1043         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1044                 return;
1045
1046         if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
1047             ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid)) {
1048
1049                 rcu_read_lock();
1050                 sta = sta_info_get(sdata, mgmt->sa);
1051
1052                 if (elems->supp_rates) {
1053                         supp_rates = ieee80211_sta_get_rates(sdata, elems,
1054                                                              band, NULL);
1055                         if (sta) {
1056                                 u32 prev_rates;
1057
1058                                 prev_rates = sta->sta.supp_rates[band];
1059                                 /* make sure mandatory rates are always added */
1060                                 scan_width = NL80211_BSS_CHAN_WIDTH_20;
1061                                 if (rx_status->flag & RX_FLAG_5MHZ)
1062                                         scan_width = NL80211_BSS_CHAN_WIDTH_5;
1063                                 if (rx_status->flag & RX_FLAG_10MHZ)
1064                                         scan_width = NL80211_BSS_CHAN_WIDTH_10;
1065
1066                                 sta->sta.supp_rates[band] = supp_rates |
1067                                         ieee80211_mandatory_rates(sband,
1068                                                                   scan_width);
1069                                 if (sta->sta.supp_rates[band] != prev_rates) {
1070                                         ibss_dbg(sdata,
1071                                                  "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n",
1072                                                  sta->sta.addr, prev_rates,
1073                                                  sta->sta.supp_rates[band]);
1074                                         rates_updated = true;
1075                                 }
1076                         } else {
1077                                 rcu_read_unlock();
1078                                 sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid,
1079                                                 mgmt->sa, supp_rates);
1080                         }
1081                 }
1082
1083                 if (sta && elems->wmm_info)
1084                         set_sta_flag(sta, WLAN_STA_WME);
1085
1086                 if (sta && elems->ht_operation && elems->ht_cap_elem &&
1087                     sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20_NOHT &&
1088                     sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_5 &&
1089                     sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_10) {
1090                         /* we both use HT */
1091                         struct ieee80211_ht_cap htcap_ie;
1092                         struct cfg80211_chan_def chandef;
1093
1094                         ieee80211_ht_oper_to_chandef(channel,
1095                                                      elems->ht_operation,
1096                                                      &chandef);
1097
1098                         memcpy(&htcap_ie, elems->ht_cap_elem, sizeof(htcap_ie));
1099
1100                         /*
1101                          * fall back to HT20 if we don't use or use
1102                          * the other extension channel
1103                          */
1104                         if (chandef.center_freq1 !=
1105                             sdata->u.ibss.chandef.center_freq1)
1106                                 htcap_ie.cap_info &=
1107                                         cpu_to_le16(~IEEE80211_HT_CAP_SUP_WIDTH_20_40);
1108
1109                         rates_updated |= ieee80211_ht_cap_ie_to_sta_ht_cap(
1110                                                 sdata, sband, &htcap_ie, sta);
1111                 }
1112
1113                 if (sta && rates_updated) {
1114                         drv_sta_rc_update(local, sdata, &sta->sta,
1115                                           IEEE80211_RC_SUPP_RATES_CHANGED);
1116                         rate_control_rate_init(sta);
1117                 }
1118
1119                 rcu_read_unlock();
1120         }
1121
1122         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1123                                         channel);
1124         if (!bss)
1125                 return;
1126
1127         cbss = container_of((void *)bss, struct cfg80211_bss, priv);
1128
1129         /* same for beacon and probe response */
1130         beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp);
1131
1132         /* check if we need to merge IBSS */
1133
1134         /* not an IBSS */
1135         if (!(cbss->capability & WLAN_CAPABILITY_IBSS))
1136                 goto put_bss;
1137
1138         /* different channel */
1139         if (sdata->u.ibss.fixed_channel &&
1140             sdata->u.ibss.chandef.chan != cbss->channel)
1141                 goto put_bss;
1142
1143         /* different SSID */
1144         if (elems->ssid_len != sdata->u.ibss.ssid_len ||
1145             memcmp(elems->ssid, sdata->u.ibss.ssid,
1146                                 sdata->u.ibss.ssid_len))
1147                 goto put_bss;
1148
1149         /* process channel switch */
1150         if (ieee80211_ibss_process_chanswitch(sdata, elems, true))
1151                 goto put_bss;
1152
1153         /* same BSSID */
1154         if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid))
1155                 goto put_bss;
1156
1157         /* we use a fixed BSSID */
1158         if (sdata->u.ibss.fixed_bssid)
1159                 goto put_bss;
1160
1161         if (ieee80211_have_rx_timestamp(rx_status)) {
1162                 /* time when timestamp field was received */
1163                 rx_timestamp =
1164                         ieee80211_calculate_rx_timestamp(local, rx_status,
1165                                                          len + FCS_LEN, 24);
1166         } else {
1167                 /*
1168                  * second best option: get current TSF
1169                  * (will return -1 if not supported)
1170                  */
1171                 rx_timestamp = drv_get_tsf(local, sdata);
1172         }
1173
1174         ibss_dbg(sdata,
1175                  "RX beacon SA=%pM BSSID=%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
1176                  mgmt->sa, mgmt->bssid,
1177                  (unsigned long long)rx_timestamp,
1178                  (unsigned long long)beacon_timestamp,
1179                  (unsigned long long)(rx_timestamp - beacon_timestamp),
1180                  jiffies);
1181
1182         if (beacon_timestamp > rx_timestamp) {
1183                 ibss_dbg(sdata,
1184                          "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n",
1185                          mgmt->bssid);
1186                 ieee80211_sta_join_ibss(sdata, bss);
1187                 supp_rates = ieee80211_sta_get_rates(sdata, elems, band, NULL);
1188                 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa,
1189                                        supp_rates);
1190                 rcu_read_unlock();
1191         }
1192
1193  put_bss:
1194         ieee80211_rx_bss_put(local, bss);
1195 }
1196
1197 void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata,
1198                               const u8 *bssid, const u8 *addr,
1199                               u32 supp_rates)
1200 {
1201         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1202         struct ieee80211_local *local = sdata->local;
1203         struct sta_info *sta;
1204         struct ieee80211_chanctx_conf *chanctx_conf;
1205         struct ieee80211_supported_band *sband;
1206         enum nl80211_bss_scan_width scan_width;
1207         int band;
1208
1209         /*
1210          * XXX: Consider removing the least recently used entry and
1211          *      allow new one to be added.
1212          */
1213         if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
1214                 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
1215                                     sdata->name, addr);
1216                 return;
1217         }
1218
1219         if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH)
1220                 return;
1221
1222         if (!ether_addr_equal(bssid, sdata->u.ibss.bssid))
1223                 return;
1224
1225         rcu_read_lock();
1226         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1227         if (WARN_ON_ONCE(!chanctx_conf)) {
1228                 rcu_read_unlock();
1229                 return;
1230         }
1231         band = chanctx_conf->def.chan->band;
1232         scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
1233         rcu_read_unlock();
1234
1235         sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
1236         if (!sta)
1237                 return;
1238
1239         sta->last_rx = jiffies;
1240
1241         /* make sure mandatory rates are always added */
1242         sband = local->hw.wiphy->bands[band];
1243         sta->sta.supp_rates[band] = supp_rates |
1244                         ieee80211_mandatory_rates(sband, scan_width);
1245
1246         spin_lock(&ifibss->incomplete_lock);
1247         list_add(&sta->list, &ifibss->incomplete_stations);
1248         spin_unlock(&ifibss->incomplete_lock);
1249         ieee80211_queue_work(&local->hw, &sdata->work);
1250 }
1251
1252 static void ieee80211_ibss_sta_expire(struct ieee80211_sub_if_data *sdata)
1253 {
1254         struct ieee80211_local *local = sdata->local;
1255         struct sta_info *sta, *tmp;
1256         unsigned long exp_time = IEEE80211_IBSS_INACTIVITY_LIMIT;
1257         unsigned long exp_rsn_time = IEEE80211_IBSS_RSN_INACTIVITY_LIMIT;
1258
1259         mutex_lock(&local->sta_mtx);
1260
1261         list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
1262                 if (sdata != sta->sdata)
1263                         continue;
1264
1265                 if (time_after(jiffies, sta->last_rx + exp_time) ||
1266                     (time_after(jiffies, sta->last_rx + exp_rsn_time) &&
1267                      sta->sta_state != IEEE80211_STA_AUTHORIZED)) {
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                         WARN_ON(__sta_info_destroy(sta));
1273                 }
1274         }
1275
1276         mutex_unlock(&local->sta_mtx);
1277 }
1278
1279 /*
1280  * This function is called with state == IEEE80211_IBSS_MLME_JOINED
1281  */
1282
1283 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
1284 {
1285         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1286         enum nl80211_bss_scan_width scan_width;
1287
1288         sdata_assert_lock(sdata);
1289
1290         mod_timer(&ifibss->timer,
1291                   round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
1292
1293         ieee80211_ibss_sta_expire(sdata);
1294
1295         if (time_before(jiffies, ifibss->last_scan_completed +
1296                        IEEE80211_IBSS_MERGE_INTERVAL))
1297                 return;
1298
1299         if (ieee80211_sta_active_ibss(sdata))
1300                 return;
1301
1302         if (ifibss->fixed_channel)
1303                 return;
1304
1305         sdata_info(sdata,
1306                    "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n");
1307
1308         scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
1309         ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len,
1310                                     NULL, scan_width);
1311 }
1312
1313 static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
1314 {
1315         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1316         u8 bssid[ETH_ALEN];
1317         u16 capability;
1318         int i;
1319
1320         sdata_assert_lock(sdata);
1321
1322         if (ifibss->fixed_bssid) {
1323                 memcpy(bssid, ifibss->bssid, ETH_ALEN);
1324         } else {
1325                 /* Generate random, not broadcast, locally administered BSSID. Mix in
1326                  * own MAC address to make sure that devices that do not have proper
1327                  * random number generator get different BSSID. */
1328                 get_random_bytes(bssid, ETH_ALEN);
1329                 for (i = 0; i < ETH_ALEN; i++)
1330                         bssid[i] ^= sdata->vif.addr[i];
1331                 bssid[0] &= ~0x01;
1332                 bssid[0] |= 0x02;
1333         }
1334
1335         sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid);
1336
1337         capability = WLAN_CAPABILITY_IBSS;
1338
1339         if (ifibss->privacy)
1340                 capability |= WLAN_CAPABILITY_PRIVACY;
1341         else
1342                 sdata->drop_unencrypted = 0;
1343
1344         __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int,
1345                                   &ifibss->chandef, ifibss->basic_rates,
1346                                   capability, 0, true);
1347 }
1348
1349 /*
1350  * This function is called with state == IEEE80211_IBSS_MLME_SEARCH
1351  */
1352
1353 static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
1354 {
1355         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1356         struct ieee80211_local *local = sdata->local;
1357         struct cfg80211_bss *cbss;
1358         struct ieee80211_channel *chan = NULL;
1359         const u8 *bssid = NULL;
1360         enum nl80211_bss_scan_width scan_width;
1361         int active_ibss;
1362         u16 capability;
1363
1364         sdata_assert_lock(sdata);
1365
1366         active_ibss = ieee80211_sta_active_ibss(sdata);
1367         ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss);
1368
1369         if (active_ibss)
1370                 return;
1371
1372         capability = WLAN_CAPABILITY_IBSS;
1373         if (ifibss->privacy)
1374                 capability |= WLAN_CAPABILITY_PRIVACY;
1375         if (ifibss->fixed_bssid)
1376                 bssid = ifibss->bssid;
1377         if (ifibss->fixed_channel)
1378                 chan = ifibss->chandef.chan;
1379         if (!is_zero_ether_addr(ifibss->bssid))
1380                 bssid = ifibss->bssid;
1381         cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid,
1382                                 ifibss->ssid, ifibss->ssid_len,
1383                                 WLAN_CAPABILITY_IBSS | WLAN_CAPABILITY_PRIVACY,
1384                                 capability);
1385
1386         if (cbss) {
1387                 struct ieee80211_bss *bss;
1388
1389                 bss = (void *)cbss->priv;
1390                 ibss_dbg(sdata,
1391                          "sta_find_ibss: selected %pM current %pM\n",
1392                          cbss->bssid, ifibss->bssid);
1393                 sdata_info(sdata,
1394                            "Selected IBSS BSSID %pM based on configured SSID\n",
1395                            cbss->bssid);
1396
1397                 ieee80211_sta_join_ibss(sdata, bss);
1398                 ieee80211_rx_bss_put(local, bss);
1399                 return;
1400         }
1401
1402         /* if a fixed bssid and a fixed freq have been provided create the IBSS
1403          * directly and do not waste time scanning
1404          */
1405         if (ifibss->fixed_bssid && ifibss->fixed_channel) {
1406                 sdata_info(sdata, "Created IBSS using preconfigured BSSID %pM\n",
1407                            bssid);
1408                 ieee80211_sta_create_ibss(sdata);
1409                 return;
1410         }
1411
1412
1413         ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n");
1414
1415         /* Selected IBSS not found in current scan results - try to scan */
1416         if (time_after(jiffies, ifibss->last_scan_completed +
1417                                         IEEE80211_SCAN_INTERVAL)) {
1418                 sdata_info(sdata, "Trigger new scan to find an IBSS to join\n");
1419
1420                 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
1421                 ieee80211_request_ibss_scan(sdata, ifibss->ssid,
1422                                             ifibss->ssid_len, chan,
1423                                             scan_width);
1424         } else {
1425                 int interval = IEEE80211_SCAN_INTERVAL;
1426
1427                 if (time_after(jiffies, ifibss->ibss_join_req +
1428                                IEEE80211_IBSS_JOIN_TIMEOUT))
1429                         ieee80211_sta_create_ibss(sdata);
1430
1431                 mod_timer(&ifibss->timer,
1432                           round_jiffies(jiffies + interval));
1433         }
1434 }
1435
1436 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
1437                                         struct sk_buff *req)
1438 {
1439         struct ieee80211_mgmt *mgmt = (void *)req->data;
1440         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1441         struct ieee80211_local *local = sdata->local;
1442         int tx_last_beacon, len = req->len;
1443         struct sk_buff *skb;
1444         struct beacon_data *presp;
1445         u8 *pos, *end;
1446
1447         sdata_assert_lock(sdata);
1448
1449         presp = rcu_dereference_protected(ifibss->presp,
1450                                           lockdep_is_held(&sdata->wdev.mtx));
1451
1452         if (ifibss->state != IEEE80211_IBSS_MLME_JOINED ||
1453             len < 24 + 2 || !presp)
1454                 return;
1455
1456         tx_last_beacon = drv_tx_last_beacon(local);
1457
1458         ibss_dbg(sdata,
1459                  "RX ProbeReq SA=%pM DA=%pM BSSID=%pM (tx_last_beacon=%d)\n",
1460                  mgmt->sa, mgmt->da, mgmt->bssid, tx_last_beacon);
1461
1462         if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da))
1463                 return;
1464
1465         if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) &&
1466             !is_broadcast_ether_addr(mgmt->bssid))
1467                 return;
1468
1469         end = ((u8 *) mgmt) + len;
1470         pos = mgmt->u.probe_req.variable;
1471         if (pos[0] != WLAN_EID_SSID ||
1472             pos + 2 + pos[1] > end) {
1473                 ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n",
1474                          mgmt->sa);
1475                 return;
1476         }
1477         if (pos[1] != 0 &&
1478             (pos[1] != ifibss->ssid_len ||
1479              memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) {
1480                 /* Ignore ProbeReq for foreign SSID */
1481                 return;
1482         }
1483
1484         /* Reply with ProbeResp */
1485         skb = dev_alloc_skb(local->tx_headroom + presp->head_len);
1486         if (!skb)
1487                 return;
1488
1489         skb_reserve(skb, local->tx_headroom);
1490         memcpy(skb_put(skb, presp->head_len), presp->head, presp->head_len);
1491
1492         memcpy(((struct ieee80211_mgmt *) skb->data)->da, mgmt->sa, ETH_ALEN);
1493         ibss_dbg(sdata, "Sending ProbeResp to %pM\n", mgmt->sa);
1494         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1495         ieee80211_tx_skb(sdata, skb);
1496 }
1497
1498 static
1499 void ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data *sdata,
1500                                     struct ieee80211_mgmt *mgmt, size_t len,
1501                                     struct ieee80211_rx_status *rx_status)
1502 {
1503         size_t baselen;
1504         struct ieee802_11_elems elems;
1505
1506         BUILD_BUG_ON(offsetof(typeof(mgmt->u.probe_resp), variable) !=
1507                      offsetof(typeof(mgmt->u.beacon), variable));
1508
1509         /*
1510          * either beacon or probe_resp but the variable field is at the
1511          * same offset
1512          */
1513         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1514         if (baselen > len)
1515                 return;
1516
1517         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1518                                false, &elems);
1519
1520         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
1521 }
1522
1523 void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1524                                    struct sk_buff *skb)
1525 {
1526         struct ieee80211_rx_status *rx_status;
1527         struct ieee80211_mgmt *mgmt;
1528         u16 fc;
1529         struct ieee802_11_elems elems;
1530         int ies_len;
1531
1532         rx_status = IEEE80211_SKB_RXCB(skb);
1533         mgmt = (struct ieee80211_mgmt *) skb->data;
1534         fc = le16_to_cpu(mgmt->frame_control);
1535
1536         sdata_lock(sdata);
1537
1538         if (!sdata->u.ibss.ssid_len)
1539                 goto mgmt_out; /* not ready to merge yet */
1540
1541         switch (fc & IEEE80211_FCTL_STYPE) {
1542         case IEEE80211_STYPE_PROBE_REQ:
1543                 ieee80211_rx_mgmt_probe_req(sdata, skb);
1544                 break;
1545         case IEEE80211_STYPE_PROBE_RESP:
1546         case IEEE80211_STYPE_BEACON:
1547                 ieee80211_rx_mgmt_probe_beacon(sdata, mgmt, skb->len,
1548                                                rx_status);
1549                 break;
1550         case IEEE80211_STYPE_AUTH:
1551                 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len);
1552                 break;
1553         case IEEE80211_STYPE_DEAUTH:
1554                 ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len);
1555                 break;
1556         case IEEE80211_STYPE_ACTION:
1557                 switch (mgmt->u.action.category) {
1558                 case WLAN_CATEGORY_SPECTRUM_MGMT:
1559                         ies_len = skb->len -
1560                                   offsetof(struct ieee80211_mgmt,
1561                                            u.action.u.chan_switch.variable);
1562
1563                         if (ies_len < 0)
1564                                 break;
1565
1566                         ieee802_11_parse_elems(
1567                                 mgmt->u.action.u.chan_switch.variable,
1568                                 ies_len, true, &elems);
1569
1570                         if (elems.parse_error)
1571                                 break;
1572
1573                         ieee80211_rx_mgmt_spectrum_mgmt(sdata, mgmt, skb->len,
1574                                                         rx_status, &elems);
1575                         break;
1576                 }
1577         }
1578
1579  mgmt_out:
1580         sdata_unlock(sdata);
1581 }
1582
1583 void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata)
1584 {
1585         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1586         struct sta_info *sta;
1587
1588         sdata_lock(sdata);
1589
1590         /*
1591          * Work could be scheduled after scan or similar
1592          * when we aren't even joined (or trying) with a
1593          * network.
1594          */
1595         if (!ifibss->ssid_len)
1596                 goto out;
1597
1598         spin_lock_bh(&ifibss->incomplete_lock);
1599         while (!list_empty(&ifibss->incomplete_stations)) {
1600                 sta = list_first_entry(&ifibss->incomplete_stations,
1601                                        struct sta_info, list);
1602                 list_del(&sta->list);
1603                 spin_unlock_bh(&ifibss->incomplete_lock);
1604
1605                 ieee80211_ibss_finish_sta(sta);
1606                 rcu_read_unlock();
1607                 spin_lock_bh(&ifibss->incomplete_lock);
1608         }
1609         spin_unlock_bh(&ifibss->incomplete_lock);
1610
1611         switch (ifibss->state) {
1612         case IEEE80211_IBSS_MLME_SEARCH:
1613                 ieee80211_sta_find_ibss(sdata);
1614                 break;
1615         case IEEE80211_IBSS_MLME_JOINED:
1616                 ieee80211_sta_merge_ibss(sdata);
1617                 break;
1618         default:
1619                 WARN_ON(1);
1620                 break;
1621         }
1622
1623  out:
1624         sdata_unlock(sdata);
1625 }
1626
1627 static void ieee80211_ibss_timer(unsigned long data)
1628 {
1629         struct ieee80211_sub_if_data *sdata =
1630                 (struct ieee80211_sub_if_data *) data;
1631
1632         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1633 }
1634
1635 void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata)
1636 {
1637         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1638
1639         setup_timer(&ifibss->timer, ieee80211_ibss_timer,
1640                     (unsigned long) sdata);
1641         INIT_LIST_HEAD(&ifibss->incomplete_stations);
1642         spin_lock_init(&ifibss->incomplete_lock);
1643         INIT_WORK(&ifibss->csa_connection_drop_work,
1644                   ieee80211_csa_connection_drop_work);
1645 }
1646
1647 /* scan finished notification */
1648 void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local)
1649 {
1650         struct ieee80211_sub_if_data *sdata;
1651
1652         mutex_lock(&local->iflist_mtx);
1653         list_for_each_entry(sdata, &local->interfaces, list) {
1654                 if (!ieee80211_sdata_running(sdata))
1655                         continue;
1656                 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
1657                         continue;
1658                 sdata->u.ibss.last_scan_completed = jiffies;
1659                 ieee80211_queue_work(&local->hw, &sdata->work);
1660         }
1661         mutex_unlock(&local->iflist_mtx);
1662 }
1663
1664 int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
1665                         struct cfg80211_ibss_params *params)
1666 {
1667         u32 changed = 0;
1668         u32 rate_flags;
1669         struct ieee80211_supported_band *sband;
1670         int i;
1671
1672         if (params->bssid) {
1673                 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN);
1674                 sdata->u.ibss.fixed_bssid = true;
1675         } else
1676                 sdata->u.ibss.fixed_bssid = false;
1677
1678         sdata->u.ibss.privacy = params->privacy;
1679         sdata->u.ibss.control_port = params->control_port;
1680         sdata->u.ibss.userspace_handles_dfs = params->userspace_handles_dfs;
1681         sdata->u.ibss.basic_rates = params->basic_rates;
1682
1683         /* fix basic_rates if channel does not support these rates */
1684         rate_flags = ieee80211_chandef_rate_flags(&params->chandef);
1685         sband = sdata->local->hw.wiphy->bands[params->chandef.chan->band];
1686         for (i = 0; i < sband->n_bitrates; i++) {
1687                 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
1688                         sdata->u.ibss.basic_rates &= ~BIT(i);
1689         }
1690         memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate,
1691                sizeof(params->mcast_rate));
1692
1693         sdata->vif.bss_conf.beacon_int = params->beacon_interval;
1694
1695         sdata->u.ibss.chandef = params->chandef;
1696         sdata->u.ibss.fixed_channel = params->channel_fixed;
1697
1698         if (params->ie) {
1699                 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len,
1700                                            GFP_KERNEL);
1701                 if (sdata->u.ibss.ie)
1702                         sdata->u.ibss.ie_len = params->ie_len;
1703         }
1704
1705         sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
1706         sdata->u.ibss.ibss_join_req = jiffies;
1707
1708         memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len);
1709         sdata->u.ibss.ssid_len = params->ssid_len;
1710
1711         memcpy(&sdata->u.ibss.ht_capa, &params->ht_capa,
1712                sizeof(sdata->u.ibss.ht_capa));
1713         memcpy(&sdata->u.ibss.ht_capa_mask, &params->ht_capa_mask,
1714                sizeof(sdata->u.ibss.ht_capa_mask));
1715
1716         /*
1717          * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is
1718          * reserved, but an HT STA shall protect HT transmissions as though
1719          * the HT Protection field were set to non-HT mixed mode.
1720          *
1721          * In an IBSS, the RIFS Mode field of the HT Operation element is
1722          * also reserved, but an HT STA shall operate as though this field
1723          * were set to 1.
1724          */
1725
1726         sdata->vif.bss_conf.ht_operation_mode |=
1727                   IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED
1728                 | IEEE80211_HT_PARAM_RIFS_MODE;
1729
1730         changed |= BSS_CHANGED_HT;
1731         ieee80211_bss_info_change_notify(sdata, changed);
1732
1733         sdata->smps_mode = IEEE80211_SMPS_OFF;
1734         sdata->needed_rx_chains = sdata->local->rx_chains;
1735
1736         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1737
1738         return 0;
1739 }
1740
1741 int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata)
1742 {
1743         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1744
1745         ieee80211_ibss_disconnect(sdata);
1746         ifibss->ssid_len = 0;
1747         memset(ifibss->bssid, 0, ETH_ALEN);
1748
1749         /* remove beacon */
1750         kfree(sdata->u.ibss.ie);
1751
1752         /* on the next join, re-program HT parameters */
1753         memset(&ifibss->ht_capa, 0, sizeof(ifibss->ht_capa));
1754         memset(&ifibss->ht_capa_mask, 0, sizeof(ifibss->ht_capa_mask));
1755
1756         synchronize_rcu();
1757
1758         skb_queue_purge(&sdata->skb_queue);
1759
1760         del_timer_sync(&sdata->u.ibss.timer);
1761
1762         return 0;
1763 }