Pileus Git - ~andy/linux/blob - 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         params.count = csa_ie.count;
 827         params.chandef = csa_ie.chandef;
 828
 829         if (ifibss->chandef.chan->band != params.chandef.chan->band)
 830                 goto disconnect;
 831
 832         switch (ifibss->chandef.width) {
 833         case NL80211_CHAN_WIDTH_20_NOHT:
 834         case NL80211_CHAN_WIDTH_20:
 835         case NL80211_CHAN_WIDTH_40:
 836                 /* keep our current HT mode (HT20/HT40+/HT40-), even if
 837                  * another mode  has been announced. The mode is not adopted
 838                  * within the beacon while doing CSA and we should therefore
 839                  * keep the mode which we announce.
 840                  */
 841                 ch_type = cfg80211_get_chandef_type(&ifibss->chandef);
 842                 cfg80211_chandef_create(&params.chandef, params.chandef.chan,
 843                                         ch_type);
 844                 break;
 845         case NL80211_CHAN_WIDTH_5:
 846         case NL80211_CHAN_WIDTH_10:
 847                 if (params.chandef.width != ifibss->chandef.width) {
 848                         sdata_info(sdata,
 849                                    "IBSS %pM received channel switch from incompatible channel width (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
 850                                    ifibss->bssid,
 851                                    params.chandef.chan->center_freq,
 852                                    params.chandef.width,
 853                                    params.chandef.center_freq1,
 854                                    params.chandef.center_freq2);
 855                         goto disconnect;
 856                 }
 857                 break;
 858         default:
 859                 /* should not happen, sta_flags should prevent VHT modes. */
 860                 WARN_ON(1);
 861                 goto disconnect;
 862         }
 863
 864         if (!cfg80211_reg_can_beacon(sdata->local->hw.wiphy, &params.chandef)) {
 865                 sdata_info(sdata,
 866                            "IBSS %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
 867                            ifibss->bssid,
 868                            params.chandef.chan->center_freq,
 869                            params.chandef.width,
 870                            params.chandef.center_freq1,
 871                            params.chandef.center_freq2);
 872                 goto disconnect;
 873         }
 874
 875         err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
 876                                             &params.chandef);
 877         if (err < 0)
 878                 goto disconnect;
 879         if (err) {
 880                 /* IBSS-DFS only allowed with a control program */
 881                 if (!ifibss->userspace_handles_dfs)
 882                         goto disconnect;
 883
 884                 params.radar_required = true;
 885         }
 886
 887         rcu_read_lock();
 888         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 889         if (!chanctx_conf) {
 890                 rcu_read_unlock();
 891                 goto disconnect;
 892         }
 893
 894         /* don't handle for multi-VIF cases */
 895         chanctx = container_of(chanctx_conf, struct ieee80211_chanctx, conf);
 896         if (chanctx->refcount > 1) {
 897                 rcu_read_unlock();
 898                 goto disconnect;
 899         }
 900         num_chanctx = 0;
 901         list_for_each_entry_rcu(chanctx, &sdata->local->chanctx_list, list)
 902                 num_chanctx++;
 903
 904         if (num_chanctx > 1) {
 905                 rcu_read_unlock();
 906                 goto disconnect;
 907         }
 908         rcu_read_unlock();
 909
 910         /* all checks done, now perform the channel switch. */
 911         ibss_dbg(sdata,
 912                  "received channel switch announcement to go to channel %d MHz\n",
 913                  params.chandef.chan->center_freq);
 914
 915         params.block_tx = !!csa_ie.mode;
 916
 917         ieee80211_ibss_csa_beacon(sdata, &params);
 918         sdata->csa_radar_required = params.radar_required;
 919
 920         if (params.block_tx)
 921                 ieee80211_stop_queues_by_reason(&sdata->local->hw,
 922                                 IEEE80211_MAX_QUEUE_MAP,
 923                                 IEEE80211_QUEUE_STOP_REASON_CSA);
 924
 925         sdata->local->csa_chandef = params.chandef;
 926         sdata->vif.csa_active = true;
 927
 928         ieee80211_bss_info_change_notify(sdata, err);
 929         drv_channel_switch_beacon(sdata, &params.chandef);
 930
 931         ieee80211_ibss_csa_mark_radar(sdata);
 932
 933         return true;
 934 disconnect:
 935         ibss_dbg(sdata, "Can't handle channel switch, disconnect\n");
 936         ieee80211_queue_work(&sdata->local->hw,
 937                              &ifibss->csa_connection_drop_work);
 938
 939         ieee80211_ibss_csa_mark_radar(sdata);
 940
 941         return true;
 942 }
 943
 944 static void
 945 ieee80211_rx_mgmt_spectrum_mgmt(struct ieee80211_sub_if_data *sdata,
 946                                 struct ieee80211_mgmt *mgmt, size_t len,
 947                                 struct ieee80211_rx_status *rx_status,
 948                                 struct ieee802_11_elems *elems)
 949 {
 950         int required_len;
 951
 952         if (len < IEEE80211_MIN_ACTION_SIZE + 1)
 953                 return;
 954
 955         /* CSA is the only action we handle for now */
 956         if (mgmt->u.action.u.measurement.action_code !=
 957             WLAN_ACTION_SPCT_CHL_SWITCH)
 958                 return;
 959
 960         required_len = IEEE80211_MIN_ACTION_SIZE +
 961                        sizeof(mgmt->u.action.u.chan_switch);
 962         if (len < required_len)
 963                 return;
 964
 965         ieee80211_ibss_process_chanswitch(sdata, elems, false);
 966 }
 967
 968 static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data *sdata,
 969                                           struct ieee80211_mgmt *mgmt,
 970                                           size_t len)
 971 {
 972         u16 reason = le16_to_cpu(mgmt->u.deauth.reason_code);
 973
 974         if (len < IEEE80211_DEAUTH_FRAME_LEN)
 975                 return;
 976
 977         ibss_dbg(sdata, "RX DeAuth SA=%pM DA=%pM BSSID=%pM (reason: %d)\n",
 978                  mgmt->sa, mgmt->da, mgmt->bssid, reason);
 979         sta_info_destroy_addr(sdata, mgmt->sa);
 980 }
 981
 982 static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata,
 983                                         struct ieee80211_mgmt *mgmt,
 984                                         size_t len)
 985 {
 986         u16 auth_alg, auth_transaction;
 987
 988         sdata_assert_lock(sdata);
 989
 990         if (len < 24 + 6)
 991                 return;
 992
 993         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
 994         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
 995
 996         ibss_dbg(sdata,
 997                  "RX Auth SA=%pM DA=%pM BSSID=%pM (auth_transaction=%d)\n",
 998                  mgmt->sa, mgmt->da, mgmt->bssid, auth_transaction);
 999
1000         if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
1001                 return;
1002
1003         /*
1004          * IEEE 802.11 standard does not require authentication in IBSS
1005          * networks and most implementations do not seem to use it.
1006          * However, try to reply to authentication attempts if someone
1007          * has actually implemented this.
1008          */
1009         ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, 0, NULL, 0,
1010                             mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0, 0);
1011 }
1012
1013 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1014                                   struct ieee80211_mgmt *mgmt, size_t len,
1015                                   struct ieee80211_rx_status *rx_status,
1016                                   struct ieee802_11_elems *elems)
1017 {
1018         struct ieee80211_local *local = sdata->local;
1019         int freq;
1020         struct cfg80211_bss *cbss;
1021         struct ieee80211_bss *bss;
1022         struct sta_info *sta;
1023         struct ieee80211_channel *channel;
1024         u64 beacon_timestamp, rx_timestamp;
1025         u32 supp_rates = 0;
1026         enum ieee80211_band band = rx_status->band;
1027         enum nl80211_bss_scan_width scan_width;
1028         struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band];
1029         bool rates_updated = false;
1030
1031         if (elems->ds_params)
1032                 freq = ieee80211_channel_to_frequency(elems->ds_params[0],
1033                                                       band);
1034         else
1035                 freq = rx_status->freq;
1036
1037         channel = ieee80211_get_channel(local->hw.wiphy, freq);
1038
1039         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1040                 return;
1041
1042         if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
1043             ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid)) {
1044
1045                 rcu_read_lock();
1046                 sta = sta_info_get(sdata, mgmt->sa);
1047
1048                 if (elems->supp_rates) {
1049                         supp_rates = ieee80211_sta_get_rates(sdata, elems,
1050                                                              band, NULL);
1051                         if (sta) {
1052                                 u32 prev_rates;
1053
1054                                 prev_rates = sta->sta.supp_rates[band];
1055                                 /* make sure mandatory rates are always added */
1056                                 scan_width = NL80211_BSS_CHAN_WIDTH_20;
1057                                 if (rx_status->flag & RX_FLAG_5MHZ)
1058                                         scan_width = NL80211_BSS_CHAN_WIDTH_5;
1059                                 if (rx_status->flag & RX_FLAG_10MHZ)
1060                                         scan_width = NL80211_BSS_CHAN_WIDTH_10;
1061
1062                                 sta->sta.supp_rates[band] = supp_rates |
1063                                         ieee80211_mandatory_rates(sband,
1064                                                                   scan_width);
1065                                 if (sta->sta.supp_rates[band] != prev_rates) {
1066                                         ibss_dbg(sdata,
1067                                                  "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n",
1068                                                  sta->sta.addr, prev_rates,
1069                                                  sta->sta.supp_rates[band]);
1070                                         rates_updated = true;
1071                                 }
1072                         } else {
1073                                 rcu_read_unlock();
1074                                 sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid,
1075                                                 mgmt->sa, supp_rates);
1076                         }
1077                 }
1078
1079                 if (sta && elems->wmm_info)
1080                         set_sta_flag(sta, WLAN_STA_WME);
1081
1082                 if (sta && elems->ht_operation && elems->ht_cap_elem &&
1083                     sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20_NOHT &&
1084                     sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_5 &&
1085                     sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_10) {
1086                         /* we both use HT */
1087                         struct ieee80211_ht_cap htcap_ie;
1088                         struct cfg80211_chan_def chandef;
1089
1090                         ieee80211_ht_oper_to_chandef(channel,
1091                                                      elems->ht_operation,
1092                                                      &chandef);
1093
1094                         memcpy(&htcap_ie, elems->ht_cap_elem, sizeof(htcap_ie));
1095
1096                         /*
1097                          * fall back to HT20 if we don't use or use
1098                          * the other extension channel
1099                          */
1100                         if (chandef.center_freq1 !=
1101                             sdata->u.ibss.chandef.center_freq1)
1102                                 htcap_ie.cap_info &=
1103                                         cpu_to_le16(~IEEE80211_HT_CAP_SUP_WIDTH_20_40);
1104
1105                         rates_updated |= ieee80211_ht_cap_ie_to_sta_ht_cap(
1106                                                 sdata, sband, &htcap_ie, sta);
1107                 }
1108
1109                 if (sta && rates_updated) {
1110                         drv_sta_rc_update(local, sdata, &sta->sta,
1111                                           IEEE80211_RC_SUPP_RATES_CHANGED);
1112                         rate_control_rate_init(sta);
1113                 }
1114
1115                 rcu_read_unlock();
1116         }
1117
1118         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1119                                         channel);
1120         if (!bss)
1121                 return;
1122
1123         cbss = container_of((void *)bss, struct cfg80211_bss, priv);
1124
1125         /* same for beacon and probe response */
1126         beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp);
1127
1128         /* check if we need to merge IBSS */
1129
1130         /* not an IBSS */
1131         if (!(cbss->capability & WLAN_CAPABILITY_IBSS))
1132                 goto put_bss;
1133
1134         /* different channel */
1135         if (sdata->u.ibss.fixed_channel &&
1136             sdata->u.ibss.chandef.chan != cbss->channel)
1137                 goto put_bss;
1138
1139         /* different SSID */
1140         if (elems->ssid_len != sdata->u.ibss.ssid_len ||
1141             memcmp(elems->ssid, sdata->u.ibss.ssid,
1142                                 sdata->u.ibss.ssid_len))
1143                 goto put_bss;
1144
1145         /* process channel switch */
1146         if (ieee80211_ibss_process_chanswitch(sdata, elems, true))
1147                 goto put_bss;
1148
1149         /* same BSSID */
1150         if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid))
1151                 goto put_bss;
1152
1153         /* we use a fixed BSSID */
1154         if (sdata->u.ibss.fixed_bssid)
1155                 goto put_bss;
1156
1157         if (ieee80211_have_rx_timestamp(rx_status)) {
1158                 /* time when timestamp field was received */
1159                 rx_timestamp =
1160                         ieee80211_calculate_rx_timestamp(local, rx_status,
1161                                                          len + FCS_LEN, 24);
1162         } else {
1163                 /*
1164                  * second best option: get current TSF
1165                  * (will return -1 if not supported)
1166                  */
1167                 rx_timestamp = drv_get_tsf(local, sdata);
1168         }
1169
1170         ibss_dbg(sdata,
1171                  "RX beacon SA=%pM BSSID=%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
1172                  mgmt->sa, mgmt->bssid,
1173                  (unsigned long long)rx_timestamp,
1174                  (unsigned long long)beacon_timestamp,
1175                  (unsigned long long)(rx_timestamp - beacon_timestamp),
1176                  jiffies);
1177
1178         if (beacon_timestamp > rx_timestamp) {
1179                 ibss_dbg(sdata,
1180                          "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n",
1181                          mgmt->bssid);
1182                 ieee80211_sta_join_ibss(sdata, bss);
1183                 supp_rates = ieee80211_sta_get_rates(sdata, elems, band, NULL);
1184                 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa,
1185                                        supp_rates);
1186                 rcu_read_unlock();
1187         }
1188
1189  put_bss:
1190         ieee80211_rx_bss_put(local, bss);
1191 }
1192
1193 void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata,
1194                               const u8 *bssid, const u8 *addr,
1195                               u32 supp_rates)
1196 {
1197         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1198         struct ieee80211_local *local = sdata->local;
1199         struct sta_info *sta;
1200         struct ieee80211_chanctx_conf *chanctx_conf;
1201         struct ieee80211_supported_band *sband;
1202         enum nl80211_bss_scan_width scan_width;
1203         int band;
1204
1205         /*
1206          * XXX: Consider removing the least recently used entry and
1207          *      allow new one to be added.
1208          */
1209         if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
1210                 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
1211                                     sdata->name, addr);
1212                 return;
1213         }
1214
1215         if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH)
1216                 return;
1217
1218         if (!ether_addr_equal(bssid, sdata->u.ibss.bssid))
1219                 return;
1220
1221         rcu_read_lock();
1222         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1223         if (WARN_ON_ONCE(!chanctx_conf)) {
1224                 rcu_read_unlock();
1225                 return;
1226         }
1227         band = chanctx_conf->def.chan->band;
1228         scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
1229         rcu_read_unlock();
1230
1231         sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
1232         if (!sta)
1233                 return;
1234
1235         sta->last_rx = jiffies;
1236
1237         /* make sure mandatory rates are always added */
1238         sband = local->hw.wiphy->bands[band];
1239         sta->sta.supp_rates[band] = supp_rates |
1240                         ieee80211_mandatory_rates(sband, scan_width);
1241
1242         spin_lock(&ifibss->incomplete_lock);
1243         list_add(&sta->list, &ifibss->incomplete_stations);
1244         spin_unlock(&ifibss->incomplete_lock);
1245         ieee80211_queue_work(&local->hw, &sdata->work);
1246 }
1247
1248 static void ieee80211_ibss_sta_expire(struct ieee80211_sub_if_data *sdata)
1249 {
1250         struct ieee80211_local *local = sdata->local;
1251         struct sta_info *sta, *tmp;
1252         unsigned long exp_time = IEEE80211_IBSS_INACTIVITY_LIMIT;
1253         unsigned long exp_rsn_time = IEEE80211_IBSS_RSN_INACTIVITY_LIMIT;
1254
1255         mutex_lock(&local->sta_mtx);
1256
1257         list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
1258                 if (sdata != sta->sdata)
1259                         continue;
1260
1261                 if (time_after(jiffies, sta->last_rx + exp_time) ||
1262                     (time_after(jiffies, sta->last_rx + exp_rsn_time) &&
1263                      sta->sta_state != IEEE80211_STA_AUTHORIZED)) {
1264                         sta_dbg(sta->sdata, "expiring inactive %sSTA %pM\n",
1265                                 sta->sta_state != IEEE80211_STA_AUTHORIZED ?
1266                                 "not authorized " : "", sta->sta.addr);
1267
1268                         WARN_ON(__sta_info_destroy(sta));
1269                 }
1270         }
1271
1272         mutex_unlock(&local->sta_mtx);
1273 }
1274
1275 /*
1276  * This function is called with state == IEEE80211_IBSS_MLME_JOINED
1277  */
1278
1279 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
1280 {
1281         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1282         enum nl80211_bss_scan_width scan_width;
1283
1284         sdata_assert_lock(sdata);
1285
1286         mod_timer(&ifibss->timer,
1287                   round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
1288
1289         ieee80211_ibss_sta_expire(sdata);
1290
1291         if (time_before(jiffies, ifibss->last_scan_completed +
1292                        IEEE80211_IBSS_MERGE_INTERVAL))
1293                 return;
1294
1295         if (ieee80211_sta_active_ibss(sdata))
1296                 return;
1297
1298         if (ifibss->fixed_channel)
1299                 return;
1300
1301         sdata_info(sdata,
1302                    "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n");
1303
1304         scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
1305         ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len,
1306                                     NULL, scan_width);
1307 }
1308
1309 static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
1310 {
1311         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1312         u8 bssid[ETH_ALEN];
1313         u16 capability;
1314         int i;
1315
1316         sdata_assert_lock(sdata);
1317
1318         if (ifibss->fixed_bssid) {
1319                 memcpy(bssid, ifibss->bssid, ETH_ALEN);
1320         } else {
1321                 /* Generate random, not broadcast, locally administered BSSID. Mix in
1322                  * own MAC address to make sure that devices that do not have proper
1323                  * random number generator get different BSSID. */
1324                 get_random_bytes(bssid, ETH_ALEN);
1325                 for (i = 0; i < ETH_ALEN; i++)
1326                         bssid[i] ^= sdata->vif.addr[i];
1327                 bssid[0] &= ~0x01;
1328                 bssid[0] |= 0x02;
1329         }
1330
1331         sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid);
1332
1333         capability = WLAN_CAPABILITY_IBSS;
1334
1335         if (ifibss->privacy)
1336                 capability |= WLAN_CAPABILITY_PRIVACY;
1337         else
1338                 sdata->drop_unencrypted = 0;
1339
1340         __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int,
1341                                   &ifibss->chandef, ifibss->basic_rates,
1342                                   capability, 0, true);
1343 }
1344
1345 /*
1346  * This function is called with state == IEEE80211_IBSS_MLME_SEARCH
1347  */
1348
1349 static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
1350 {
1351         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1352         struct ieee80211_local *local = sdata->local;
1353         struct cfg80211_bss *cbss;
1354         struct ieee80211_channel *chan = NULL;
1355         const u8 *bssid = NULL;
1356         enum nl80211_bss_scan_width scan_width;
1357         int active_ibss;
1358         u16 capability;
1359
1360         sdata_assert_lock(sdata);
1361
1362         active_ibss = ieee80211_sta_active_ibss(sdata);
1363         ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss);
1364
1365         if (active_ibss)
1366                 return;
1367
1368         capability = WLAN_CAPABILITY_IBSS;
1369         if (ifibss->privacy)
1370                 capability |= WLAN_CAPABILITY_PRIVACY;
1371         if (ifibss->fixed_bssid)
1372                 bssid = ifibss->bssid;
1373         if (ifibss->fixed_channel)
1374                 chan = ifibss->chandef.chan;
1375         if (!is_zero_ether_addr(ifibss->bssid))
1376                 bssid = ifibss->bssid;
1377         cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid,
1378                                 ifibss->ssid, ifibss->ssid_len,
1379                                 WLAN_CAPABILITY_IBSS | WLAN_CAPABILITY_PRIVACY,
1380                                 capability);
1381
1382         if (cbss) {
1383                 struct ieee80211_bss *bss;
1384
1385                 bss = (void *)cbss->priv;
1386                 ibss_dbg(sdata,
1387                          "sta_find_ibss: selected %pM current %pM\n",
1388                          cbss->bssid, ifibss->bssid);
1389                 sdata_info(sdata,
1390                            "Selected IBSS BSSID %pM based on configured SSID\n",
1391                            cbss->bssid);
1392
1393                 ieee80211_sta_join_ibss(sdata, bss);
1394                 ieee80211_rx_bss_put(local, bss);
1395                 return;
1396         }
1397
1398         /* if a fixed bssid and a fixed freq have been provided create the IBSS
1399          * directly and do not waste time scanning
1400          */
1401         if (ifibss->fixed_bssid && ifibss->fixed_channel) {
1402                 sdata_info(sdata, "Created IBSS using preconfigured BSSID %pM\n",
1403                            bssid);
1404                 ieee80211_sta_create_ibss(sdata);
1405                 return;
1406         }
1407
1408
1409         ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n");
1410
1411         /* Selected IBSS not found in current scan results - try to scan */
1412         if (time_after(jiffies, ifibss->last_scan_completed +
1413                                         IEEE80211_SCAN_INTERVAL)) {
1414                 sdata_info(sdata, "Trigger new scan to find an IBSS to join\n");
1415
1416                 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
1417                 ieee80211_request_ibss_scan(sdata, ifibss->ssid,
1418                                             ifibss->ssid_len, chan,
1419                                             scan_width);
1420         } else {
1421                 int interval = IEEE80211_SCAN_INTERVAL;
1422
1423                 if (time_after(jiffies, ifibss->ibss_join_req +
1424                                IEEE80211_IBSS_JOIN_TIMEOUT))
1425                         ieee80211_sta_create_ibss(sdata);
1426
1427                 mod_timer(&ifibss->timer,
1428                           round_jiffies(jiffies + interval));
1429         }
1430 }
1431
1432 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
1433                                         struct sk_buff *req)
1434 {
1435         struct ieee80211_mgmt *mgmt = (void *)req->data;
1436         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1437         struct ieee80211_local *local = sdata->local;
1438         int tx_last_beacon, len = req->len;
1439         struct sk_buff *skb;
1440         struct beacon_data *presp;
1441         u8 *pos, *end;
1442
1443         sdata_assert_lock(sdata);
1444
1445         presp = rcu_dereference_protected(ifibss->presp,
1446                                           lockdep_is_held(&sdata->wdev.mtx));
1447
1448         if (ifibss->state != IEEE80211_IBSS_MLME_JOINED ||
1449             len < 24 + 2 || !presp)
1450                 return;
1451
1452         tx_last_beacon = drv_tx_last_beacon(local);
1453
1454         ibss_dbg(sdata,
1455                  "RX ProbeReq SA=%pM DA=%pM BSSID=%pM (tx_last_beacon=%d)\n",
1456                  mgmt->sa, mgmt->da, mgmt->bssid, tx_last_beacon);
1457
1458         if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da))
1459                 return;
1460
1461         if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) &&
1462             !is_broadcast_ether_addr(mgmt->bssid))
1463                 return;
1464
1465         end = ((u8 *) mgmt) + len;
1466         pos = mgmt->u.probe_req.variable;
1467         if (pos[0] != WLAN_EID_SSID ||
1468             pos + 2 + pos[1] > end) {
1469                 ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n",
1470                          mgmt->sa);
1471                 return;
1472         }
1473         if (pos[1] != 0 &&
1474             (pos[1] != ifibss->ssid_len ||
1475              memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) {
1476                 /* Ignore ProbeReq for foreign SSID */
1477                 return;
1478         }
1479
1480         /* Reply with ProbeResp */
1481         skb = dev_alloc_skb(local->tx_headroom + presp->head_len);
1482         if (!skb)
1483                 return;
1484
1485         skb_reserve(skb, local->tx_headroom);
1486         memcpy(skb_put(skb, presp->head_len), presp->head, presp->head_len);
1487
1488         memcpy(((struct ieee80211_mgmt *) skb->data)->da, mgmt->sa, ETH_ALEN);
1489         ibss_dbg(sdata, "Sending ProbeResp to %pM\n", mgmt->sa);
1490         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1491         ieee80211_tx_skb(sdata, skb);
1492 }
1493
1494 static
1495 void ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data *sdata,
1496                                     struct ieee80211_mgmt *mgmt, size_t len,
1497                                     struct ieee80211_rx_status *rx_status)
1498 {
1499         size_t baselen;
1500         struct ieee802_11_elems elems;
1501
1502         BUILD_BUG_ON(offsetof(typeof(mgmt->u.probe_resp), variable) !=
1503                      offsetof(typeof(mgmt->u.beacon), variable));
1504
1505         /*
1506          * either beacon or probe_resp but the variable field is at the
1507          * same offset
1508          */
1509         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1510         if (baselen > len)
1511                 return;
1512
1513         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1514                                false, &elems);
1515
1516         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
1517 }
1518
1519 void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1520                                    struct sk_buff *skb)
1521 {
1522         struct ieee80211_rx_status *rx_status;
1523         struct ieee80211_mgmt *mgmt;
1524         u16 fc;
1525         struct ieee802_11_elems elems;
1526         int ies_len;
1527
1528         rx_status = IEEE80211_SKB_RXCB(skb);
1529         mgmt = (struct ieee80211_mgmt *) skb->data;
1530         fc = le16_to_cpu(mgmt->frame_control);
1531
1532         sdata_lock(sdata);
1533
1534         if (!sdata->u.ibss.ssid_len)
1535                 goto mgmt_out; /* not ready to merge yet */
1536
1537         switch (fc & IEEE80211_FCTL_STYPE) {
1538         case IEEE80211_STYPE_PROBE_REQ:
1539                 ieee80211_rx_mgmt_probe_req(sdata, skb);
1540                 break;
1541         case IEEE80211_STYPE_PROBE_RESP:
1542         case IEEE80211_STYPE_BEACON:
1543                 ieee80211_rx_mgmt_probe_beacon(sdata, mgmt, skb->len,
1544                                                rx_status);
1545                 break;
1546         case IEEE80211_STYPE_AUTH:
1547                 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len);
1548                 break;
1549         case IEEE80211_STYPE_DEAUTH:
1550                 ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len);
1551                 break;
1552         case IEEE80211_STYPE_ACTION:
1553                 switch (mgmt->u.action.category) {
1554                 case WLAN_CATEGORY_SPECTRUM_MGMT:
1555                         ies_len = skb->len -
1556                                   offsetof(struct ieee80211_mgmt,
1557                                            u.action.u.chan_switch.variable);
1558
1559                         if (ies_len < 0)
1560                                 break;
1561
1562                         ieee802_11_parse_elems(
1563                                 mgmt->u.action.u.chan_switch.variable,
1564                                 ies_len, true, &elems);
1565
1566                         if (elems.parse_error)
1567                                 break;
1568
1569                         ieee80211_rx_mgmt_spectrum_mgmt(sdata, mgmt, skb->len,
1570                                                         rx_status, &elems);
1571                         break;
1572                 }
1573         }
1574
1575  mgmt_out:
1576         sdata_unlock(sdata);
1577 }
1578
1579 void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata)
1580 {
1581         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1582         struct sta_info *sta;
1583
1584         sdata_lock(sdata);
1585
1586         /*
1587          * Work could be scheduled after scan or similar
1588          * when we aren't even joined (or trying) with a
1589          * network.
1590          */
1591         if (!ifibss->ssid_len)
1592                 goto out;
1593
1594         spin_lock_bh(&ifibss->incomplete_lock);
1595         while (!list_empty(&ifibss->incomplete_stations)) {
1596                 sta = list_first_entry(&ifibss->incomplete_stations,
1597                                        struct sta_info, list);
1598                 list_del(&sta->list);
1599                 spin_unlock_bh(&ifibss->incomplete_lock);
1600
1601                 ieee80211_ibss_finish_sta(sta);
1602                 rcu_read_unlock();
1603                 spin_lock_bh(&ifibss->incomplete_lock);
1604         }
1605         spin_unlock_bh(&ifibss->incomplete_lock);
1606
1607         switch (ifibss->state) {
1608         case IEEE80211_IBSS_MLME_SEARCH:
1609                 ieee80211_sta_find_ibss(sdata);
1610                 break;
1611         case IEEE80211_IBSS_MLME_JOINED:
1612                 ieee80211_sta_merge_ibss(sdata);
1613                 break;
1614         default:
1615                 WARN_ON(1);
1616                 break;
1617         }
1618
1619  out:
1620         sdata_unlock(sdata);
1621 }
1622
1623 static void ieee80211_ibss_timer(unsigned long data)
1624 {
1625         struct ieee80211_sub_if_data *sdata =
1626                 (struct ieee80211_sub_if_data *) data;
1627
1628         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1629 }
1630
1631 void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata)
1632 {
1633         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1634
1635         setup_timer(&ifibss->timer, ieee80211_ibss_timer,
1636                     (unsigned long) sdata);
1637         INIT_LIST_HEAD(&ifibss->incomplete_stations);
1638         spin_lock_init(&ifibss->incomplete_lock);
1639         INIT_WORK(&ifibss->csa_connection_drop_work,
1640                   ieee80211_csa_connection_drop_work);
1641 }
1642
1643 /* scan finished notification */
1644 void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local)
1645 {
1646         struct ieee80211_sub_if_data *sdata;
1647
1648         mutex_lock(&local->iflist_mtx);
1649         list_for_each_entry(sdata, &local->interfaces, list) {
1650                 if (!ieee80211_sdata_running(sdata))
1651                         continue;
1652                 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
1653                         continue;
1654                 sdata->u.ibss.last_scan_completed = jiffies;
1655                 ieee80211_queue_work(&local->hw, &sdata->work);
1656         }
1657         mutex_unlock(&local->iflist_mtx);
1658 }
1659
1660 int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
1661                         struct cfg80211_ibss_params *params)
1662 {
1663         u32 changed = 0;
1664         u32 rate_flags;
1665         struct ieee80211_supported_band *sband;
1666         int i;
1667
1668         if (params->bssid) {
1669                 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN);
1670                 sdata->u.ibss.fixed_bssid = true;
1671         } else
1672                 sdata->u.ibss.fixed_bssid = false;
1673
1674         sdata->u.ibss.privacy = params->privacy;
1675         sdata->u.ibss.control_port = params->control_port;
1676         sdata->u.ibss.userspace_handles_dfs = params->userspace_handles_dfs;
1677         sdata->u.ibss.basic_rates = params->basic_rates;
1678
1679         /* fix basic_rates if channel does not support these rates */
1680         rate_flags = ieee80211_chandef_rate_flags(&params->chandef);
1681         sband = sdata->local->hw.wiphy->bands[params->chandef.chan->band];
1682         for (i = 0; i < sband->n_bitrates; i++) {
1683                 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
1684                         sdata->u.ibss.basic_rates &= ~BIT(i);
1685         }
1686         memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate,
1687                sizeof(params->mcast_rate));
1688
1689         sdata->vif.bss_conf.beacon_int = params->beacon_interval;
1690
1691         sdata->u.ibss.chandef = params->chandef;
1692         sdata->u.ibss.fixed_channel = params->channel_fixed;
1693
1694         if (params->ie) {
1695                 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len,
1696                                            GFP_KERNEL);
1697                 if (sdata->u.ibss.ie)
1698                         sdata->u.ibss.ie_len = params->ie_len;
1699         }
1700
1701         sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
1702         sdata->u.ibss.ibss_join_req = jiffies;
1703
1704         memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len);
1705         sdata->u.ibss.ssid_len = params->ssid_len;
1706
1707         memcpy(&sdata->u.ibss.ht_capa, &params->ht_capa,
1708                sizeof(sdata->u.ibss.ht_capa));
1709         memcpy(&sdata->u.ibss.ht_capa_mask, &params->ht_capa_mask,
1710                sizeof(sdata->u.ibss.ht_capa_mask));
1711
1712         /*
1713          * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is
1714          * reserved, but an HT STA shall protect HT transmissions as though
1715          * the HT Protection field were set to non-HT mixed mode.
1716          *
1717          * In an IBSS, the RIFS Mode field of the HT Operation element is
1718          * also reserved, but an HT STA shall operate as though this field
1719          * were set to 1.
1720          */
1721
1722         sdata->vif.bss_conf.ht_operation_mode |=
1723                   IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED
1724                 | IEEE80211_HT_PARAM_RIFS_MODE;
1725
1726         changed |= BSS_CHANGED_HT;
1727         ieee80211_bss_info_change_notify(sdata, changed);
1728
1729         sdata->smps_mode = IEEE80211_SMPS_OFF;
1730         sdata->needed_rx_chains = sdata->local->rx_chains;
1731
1732         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1733
1734         return 0;
1735 }
1736
1737 int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata)
1738 {
1739         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1740
1741         ieee80211_ibss_disconnect(sdata);
1742         ifibss->ssid_len = 0;
1743         memset(ifibss->bssid, 0, ETH_ALEN);
1744
1745         /* remove beacon */
1746         kfree(sdata->u.ibss.ie);
1747
1748         /* on the next join, re-program HT parameters */
1749         memset(&ifibss->ht_capa, 0, sizeof(ifibss->ht_capa));
1750         memset(&ifibss->ht_capa_mask, 0, sizeof(ifibss->ht_capa_mask));
1751
1752         synchronize_rcu();
1753
1754         skb_queue_purge(&sdata->skb_queue);
1755
1756         del_timer_sync(&sdata->u.ibss.timer);
1757
1758         return 0;
1759 }