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         int err;
 233
 234         sdata_assert_lock(sdata);
 235
 236         /* Reset own TSF to allow time synchronization work. */
 237         drv_reset_tsf(local, sdata);
 238
 239         if (!ether_addr_equal(ifibss->bssid, bssid))
 240                 sta_info_flush(sdata);
 241
 242         /* if merging, indicate to driver that we leave the old IBSS */
 243         if (sdata->vif.bss_conf.ibss_joined) {
 244                 sdata->vif.bss_conf.ibss_joined = false;
 245                 sdata->vif.bss_conf.ibss_creator = false;
 246                 sdata->vif.bss_conf.enable_beacon = false;
 247                 netif_carrier_off(sdata->dev);
 248                 ieee80211_bss_info_change_notify(sdata,
 249                                                  BSS_CHANGED_IBSS |
 250                                                  BSS_CHANGED_BEACON_ENABLED);
 251                 drv_leave_ibss(local, sdata);
 252         }
 253
 254         presp = rcu_dereference_protected(ifibss->presp,
 255                                           lockdep_is_held(&sdata->wdev.mtx));
 256         rcu_assign_pointer(ifibss->presp, NULL);
 257         if (presp)
 258                 kfree_rcu(presp, rcu_head);
 259
 260         sdata->drop_unencrypted = capability & WLAN_CAPABILITY_PRIVACY ? 1 : 0;
 261
 262         /* make a copy of the chandef, it could be modified below. */
 263         chandef = *req_chandef;
 264         chan = chandef.chan;
 265         if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef)) {
 266                 if (chandef.width == NL80211_CHAN_WIDTH_5 ||
 267                     chandef.width == NL80211_CHAN_WIDTH_10 ||
 268                     chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
 269                     chandef.width == NL80211_CHAN_WIDTH_20) {
 270                         sdata_info(sdata,
 271                                    "Failed to join IBSS, beacons forbidden\n");
 272                         return;
 273                 }
 274                 chandef.width = NL80211_CHAN_WIDTH_20;
 275                 chandef.center_freq1 = chan->center_freq;
 276         }
 277
 278         ieee80211_vif_release_channel(sdata);
 279         if (ieee80211_vif_use_channel(sdata, &chandef,
 280                                       ifibss->fixed_channel ?
 281                                         IEEE80211_CHANCTX_SHARED :
 282                                         IEEE80211_CHANCTX_EXCLUSIVE)) {
 283                 sdata_info(sdata, "Failed to join IBSS, no channel context\n");
 284                 return;
 285         }
 286
 287         memcpy(ifibss->bssid, bssid, ETH_ALEN);
 288
 289         sband = local->hw.wiphy->bands[chan->band];
 290
 291         presp = ieee80211_ibss_build_presp(sdata, beacon_int, basic_rates,
 292                                            capability, tsf, &chandef,
 293                                            &have_higher_than_11mbit, NULL);
 294         if (!presp)
 295                 return;
 296
 297         rcu_assign_pointer(ifibss->presp, presp);
 298         mgmt = (void *)presp->head;
 299
 300         sdata->vif.bss_conf.enable_beacon = true;
 301         sdata->vif.bss_conf.beacon_int = beacon_int;
 302         sdata->vif.bss_conf.basic_rates = basic_rates;
 303         sdata->vif.bss_conf.ssid_len = ifibss->ssid_len;
 304         memcpy(sdata->vif.bss_conf.ssid, ifibss->ssid, ifibss->ssid_len);
 305         bss_change = BSS_CHANGED_BEACON_INT;
 306         bss_change |= ieee80211_reset_erp_info(sdata);
 307         bss_change |= BSS_CHANGED_BSSID;
 308         bss_change |= BSS_CHANGED_BEACON;
 309         bss_change |= BSS_CHANGED_BEACON_ENABLED;
 310         bss_change |= BSS_CHANGED_BASIC_RATES;
 311         bss_change |= BSS_CHANGED_HT;
 312         bss_change |= BSS_CHANGED_IBSS;
 313         bss_change |= BSS_CHANGED_SSID;
 314
 315         /*
 316          * In 5 GHz/802.11a, we can always use short slot time.
 317          * (IEEE 802.11-2012 18.3.8.7)
 318          *
 319          * In 2.4GHz, we must always use long slots in IBSS for compatibility
 320          * reasons.
 321          * (IEEE 802.11-2012 19.4.5)
 322          *
 323          * HT follows these specifications (IEEE 802.11-2012 20.3.18)
 324          */
 325         sdata->vif.bss_conf.use_short_slot = chan->band == IEEE80211_BAND_5GHZ;
 326         bss_change |= BSS_CHANGED_ERP_SLOT;
 327
 328         /* cf. IEEE 802.11 9.2.12 */
 329         if (chan->band == IEEE80211_BAND_2GHZ && have_higher_than_11mbit)
 330                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
 331         else
 332                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
 333
 334         ieee80211_set_wmm_default(sdata, true);
 335
 336         sdata->vif.bss_conf.ibss_joined = true;
 337         sdata->vif.bss_conf.ibss_creator = creator;
 338
 339         err = drv_join_ibss(local, sdata);
 340         if (err) {
 341                 sdata->vif.bss_conf.ibss_joined = false;
 342                 sdata->vif.bss_conf.ibss_creator = false;
 343                 sdata->vif.bss_conf.enable_beacon = false;
 344                 sdata->vif.bss_conf.ssid_len = 0;
 345                 RCU_INIT_POINTER(ifibss->presp, NULL);
 346                 kfree_rcu(presp, rcu_head);
 347                 ieee80211_vif_release_channel(sdata);
 348                 sdata_info(sdata, "Failed to join IBSS, driver failure: %d\n",
 349                            err);
 350                 return;
 351         }
 352
 353         ieee80211_bss_info_change_notify(sdata, bss_change);
 354
 355         ifibss->state = IEEE80211_IBSS_MLME_JOINED;
 356         mod_timer(&ifibss->timer,
 357                   round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
 358
 359         scan_width = cfg80211_chandef_to_scan_width(&chandef);
 360         bss = cfg80211_inform_bss_width_frame(local->hw.wiphy, chan,
 361                                               scan_width, mgmt,
 362                                               presp->head_len, 0, GFP_KERNEL);
 363         cfg80211_put_bss(local->hw.wiphy, bss);
 364         netif_carrier_on(sdata->dev);
 365         cfg80211_ibss_joined(sdata->dev, ifibss->bssid, GFP_KERNEL);
 366 }
 367
 368 static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
 369                                     struct ieee80211_bss *bss)
 370 {
 371         struct cfg80211_bss *cbss =
 372                 container_of((void *)bss, struct cfg80211_bss, priv);
 373         struct ieee80211_supported_band *sband;
 374         struct cfg80211_chan_def chandef;
 375         u32 basic_rates;
 376         int i, j;
 377         u16 beacon_int = cbss->beacon_interval;
 378         const struct cfg80211_bss_ies *ies;
 379         enum nl80211_channel_type chan_type;
 380         u64 tsf;
 381         u32 rate_flags;
 382         int shift;
 383
 384         sdata_assert_lock(sdata);
 385
 386         if (beacon_int < 10)
 387                 beacon_int = 10;
 388
 389         switch (sdata->u.ibss.chandef.width) {
 390         case NL80211_CHAN_WIDTH_20_NOHT:
 391         case NL80211_CHAN_WIDTH_20:
 392         case NL80211_CHAN_WIDTH_40:
 393                 chan_type = cfg80211_get_chandef_type(&sdata->u.ibss.chandef);
 394                 cfg80211_chandef_create(&chandef, cbss->channel, chan_type);
 395                 break;
 396         case NL80211_CHAN_WIDTH_5:
 397         case NL80211_CHAN_WIDTH_10:
 398                 cfg80211_chandef_create(&chandef, cbss->channel,
 399                                         NL80211_CHAN_WIDTH_20_NOHT);
 400                 chandef.width = sdata->u.ibss.chandef.width;
 401                 break;
 402         default:
 403                 /* fall back to 20 MHz for unsupported modes */
 404                 cfg80211_chandef_create(&chandef, cbss->channel,
 405                                         NL80211_CHAN_WIDTH_20_NOHT);
 406                 break;
 407         }
 408
 409         sband = sdata->local->hw.wiphy->bands[cbss->channel->band];
 410         rate_flags = ieee80211_chandef_rate_flags(&sdata->u.ibss.chandef);
 411         shift = ieee80211_vif_get_shift(&sdata->vif);
 412
 413         basic_rates = 0;
 414
 415         for (i = 0; i < bss->supp_rates_len; i++) {
 416                 int rate = bss->supp_rates[i] & 0x7f;
 417                 bool is_basic = !!(bss->supp_rates[i] & 0x80);
 418
 419                 for (j = 0; j < sband->n_bitrates; j++) {
 420                         int brate;
 421                         if ((rate_flags & sband->bitrates[j].flags)
 422                             != rate_flags)
 423                                 continue;
 424
 425                         brate = DIV_ROUND_UP(sband->bitrates[j].bitrate,
 426                                              5 * (1 << shift));
 427                         if (brate == rate) {
 428                                 if (is_basic)
 429                                         basic_rates |= BIT(j);
 430                                 break;
 431                         }
 432                 }
 433         }
 434
 435         rcu_read_lock();
 436         ies = rcu_dereference(cbss->ies);
 437         tsf = ies->tsf;
 438         rcu_read_unlock();
 439
 440         __ieee80211_sta_join_ibss(sdata, cbss->bssid,
 441                                   beacon_int,
 442                                   &chandef,
 443                                   basic_rates,
 444                                   cbss->capability,
 445                                   tsf, false);
 446 }
 447
 448 static int ieee80211_send_action_csa(struct ieee80211_sub_if_data *sdata,
 449                                      struct cfg80211_csa_settings *csa_settings)
 450 {
 451         struct sk_buff *skb;
 452         struct ieee80211_mgmt *mgmt;
 453         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 454         struct ieee80211_local *local = sdata->local;
 455         int freq;
 456         int hdr_len = offsetof(struct ieee80211_mgmt, u.action.u.chan_switch) +
 457                       sizeof(mgmt->u.action.u.chan_switch);
 458         u8 *pos;
 459
 460         skb = dev_alloc_skb(local->tx_headroom + hdr_len +
 461                             5 + /* channel switch announcement element */
 462                             3); /* secondary channel offset element */
 463         if (!skb)
 464                 return -1;
 465
 466         skb_reserve(skb, local->tx_headroom);
 467         mgmt = (struct ieee80211_mgmt *)skb_put(skb, hdr_len);
 468         memset(mgmt, 0, hdr_len);
 469         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 470                                           IEEE80211_STYPE_ACTION);
 471
 472         eth_broadcast_addr(mgmt->da);
 473         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 474         memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN);
 475         mgmt->u.action.category = WLAN_CATEGORY_SPECTRUM_MGMT;
 476         mgmt->u.action.u.chan_switch.action_code = WLAN_ACTION_SPCT_CHL_SWITCH;
 477         pos = skb_put(skb, 5);
 478         *pos++ = WLAN_EID_CHANNEL_SWITCH;                       /* EID */
 479         *pos++ = 3;                                             /* IE length */
 480         *pos++ = csa_settings->block_tx ? 1 : 0;                /* CSA mode */
 481         freq = csa_settings->chandef.chan->center_freq;
 482         *pos++ = ieee80211_frequency_to_channel(freq);          /* channel */
 483         *pos++ = csa_settings->count;                           /* count */
 484
 485         if (csa_settings->chandef.width == NL80211_CHAN_WIDTH_40) {
 486                 enum nl80211_channel_type ch_type;
 487
 488                 skb_put(skb, 3);
 489                 *pos++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET;     /* EID */
 490                 *pos++ = 1;                                     /* IE length */
 491                 ch_type = cfg80211_get_chandef_type(&csa_settings->chandef);
 492                 if (ch_type == NL80211_CHAN_HT40PLUS)
 493                         *pos++ = IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
 494                 else
 495                         *pos++ = IEEE80211_HT_PARAM_CHA_SEC_BELOW;
 496         }
 497
 498         ieee80211_tx_skb(sdata, skb);
 499         return 0;
 500 }
 501
 502 int ieee80211_ibss_csa_beacon(struct ieee80211_sub_if_data *sdata,
 503                               struct cfg80211_csa_settings *csa_settings)
 504 {
 505         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 506         struct beacon_data *presp, *old_presp;
 507         struct cfg80211_bss *cbss;
 508         const struct cfg80211_bss_ies *ies;
 509         u16 capability;
 510         u64 tsf;
 511         int ret = 0;
 512
 513         sdata_assert_lock(sdata);
 514
 515         capability = WLAN_CAPABILITY_IBSS;
 516
 517         if (ifibss->privacy)
 518                 capability |= WLAN_CAPABILITY_PRIVACY;
 519
 520         cbss = cfg80211_get_bss(sdata->local->hw.wiphy, ifibss->chandef.chan,
 521                                 ifibss->bssid, ifibss->ssid,
 522                                 ifibss->ssid_len, WLAN_CAPABILITY_IBSS |
 523                                 WLAN_CAPABILITY_PRIVACY,
 524                                 capability);
 525
 526         if (WARN_ON(!cbss)) {
 527                 ret = -EINVAL;
 528                 goto out;
 529         }
 530
 531         rcu_read_lock();
 532         ies = rcu_dereference(cbss->ies);
 533         tsf = ies->tsf;
 534         rcu_read_unlock();
 535         cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
 536
 537         old_presp = rcu_dereference_protected(ifibss->presp,
 538                                           lockdep_is_held(&sdata->wdev.mtx));
 539
 540         presp = ieee80211_ibss_build_presp(sdata,
 541                                            sdata->vif.bss_conf.beacon_int,
 542                                            sdata->vif.bss_conf.basic_rates,
 543                                            capability, tsf, &ifibss->chandef,
 544                                            NULL, csa_settings);
 545         if (!presp) {
 546                 ret = -ENOMEM;
 547                 goto out;
 548         }
 549
 550         rcu_assign_pointer(ifibss->presp, presp);
 551         if (old_presp)
 552                 kfree_rcu(old_presp, rcu_head);
 553
 554         /* it might not send the beacon for a while. send an action frame
 555          * immediately to announce the channel switch.
 556          */
 557         if (csa_settings)
 558                 ieee80211_send_action_csa(sdata, csa_settings);
 559
 560         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON);
 561  out:
 562         return ret;
 563 }
 564
 565 int ieee80211_ibss_finish_csa(struct ieee80211_sub_if_data *sdata)
 566 {
 567         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 568         struct cfg80211_bss *cbss;
 569         int err;
 570         u16 capability;
 571
 572         sdata_lock(sdata);
 573         /* update cfg80211 bss information with the new channel */
 574         if (!is_zero_ether_addr(ifibss->bssid)) {
 575                 capability = WLAN_CAPABILITY_IBSS;
 576
 577                 if (ifibss->privacy)
 578                         capability |= WLAN_CAPABILITY_PRIVACY;
 579
 580                 cbss = cfg80211_get_bss(sdata->local->hw.wiphy,
 581                                         ifibss->chandef.chan,
 582                                         ifibss->bssid, ifibss->ssid,
 583                                         ifibss->ssid_len, WLAN_CAPABILITY_IBSS |
 584                                         WLAN_CAPABILITY_PRIVACY,
 585                                         capability);
 586                 /* XXX: should not really modify cfg80211 data */
 587                 if (cbss) {
 588                         cbss->channel = sdata->local->csa_chandef.chan;
 589                         cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
 590                 }
 591         }
 592
 593         ifibss->chandef = sdata->local->csa_chandef;
 594
 595         /* generate the beacon */
 596         err = ieee80211_ibss_csa_beacon(sdata, NULL);
 597         sdata_unlock(sdata);
 598         if (err < 0)
 599                 return err;
 600
 601         return 0;
 602 }
 603
 604 void ieee80211_ibss_stop(struct ieee80211_sub_if_data *sdata)
 605 {
 606         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 607
 608         cancel_work_sync(&ifibss->csa_connection_drop_work);
 609 }
 610
 611 static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta)
 612         __acquires(RCU)
 613 {
 614         struct ieee80211_sub_if_data *sdata = sta->sdata;
 615         u8 addr[ETH_ALEN];
 616
 617         memcpy(addr, sta->sta.addr, ETH_ALEN);
 618
 619         ibss_dbg(sdata, "Adding new IBSS station %pM\n", addr);
 620
 621         sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
 622         sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
 623         /* authorize the station only if the network is not RSN protected. If
 624          * not wait for the userspace to authorize it */
 625         if (!sta->sdata->u.ibss.control_port)
 626                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
 627
 628         rate_control_rate_init(sta);
 629
 630         /* If it fails, maybe we raced another insertion? */
 631         if (sta_info_insert_rcu(sta))
 632                 return sta_info_get(sdata, addr);
 633         return sta;
 634 }
 635
 636 static struct sta_info *
 637 ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, const u8 *bssid,
 638                        const u8 *addr, u32 supp_rates)
 639         __acquires(RCU)
 640 {
 641         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 642         struct ieee80211_local *local = sdata->local;
 643         struct sta_info *sta;
 644         struct ieee80211_chanctx_conf *chanctx_conf;
 645         struct ieee80211_supported_band *sband;
 646         enum nl80211_bss_scan_width scan_width;
 647         int band;
 648
 649         /*
 650          * XXX: Consider removing the least recently used entry and
 651          *      allow new one to be added.
 652          */
 653         if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
 654                 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
 655                                     sdata->name, addr);
 656                 rcu_read_lock();
 657                 return NULL;
 658         }
 659
 660         if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) {
 661                 rcu_read_lock();
 662                 return NULL;
 663         }
 664
 665         if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) {
 666                 rcu_read_lock();
 667                 return NULL;
 668         }
 669
 670         rcu_read_lock();
 671         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 672         if (WARN_ON_ONCE(!chanctx_conf))
 673                 return NULL;
 674         band = chanctx_conf->def.chan->band;
 675         scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
 676         rcu_read_unlock();
 677
 678         sta = sta_info_alloc(sdata, addr, GFP_KERNEL);
 679         if (!sta) {
 680                 rcu_read_lock();
 681                 return NULL;
 682         }
 683
 684         sta->last_rx = jiffies;
 685
 686         /* make sure mandatory rates are always added */
 687         sband = local->hw.wiphy->bands[band];
 688         sta->sta.supp_rates[band] = supp_rates |
 689                         ieee80211_mandatory_rates(sband, scan_width);
 690
 691         return ieee80211_ibss_finish_sta(sta);
 692 }
 693
 694 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
 695 {
 696         struct ieee80211_local *local = sdata->local;
 697         int active = 0;
 698         struct sta_info *sta;
 699
 700         sdata_assert_lock(sdata);
 701
 702         rcu_read_lock();
 703
 704         list_for_each_entry_rcu(sta, &local->sta_list, list) {
 705                 if (sta->sdata == sdata &&
 706                     time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
 707                                jiffies)) {
 708                         active++;
 709                         break;
 710                 }
 711         }
 712
 713         rcu_read_unlock();
 714
 715         return active;
 716 }
 717
 718 static void ieee80211_ibss_disconnect(struct ieee80211_sub_if_data *sdata)
 719 {
 720         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 721         struct ieee80211_local *local = sdata->local;
 722         struct cfg80211_bss *cbss;
 723         struct beacon_data *presp;
 724         struct sta_info *sta;
 725         int active_ibss;
 726         u16 capability;
 727
 728         active_ibss = ieee80211_sta_active_ibss(sdata);
 729
 730         if (!active_ibss && !is_zero_ether_addr(ifibss->bssid)) {
 731                 capability = WLAN_CAPABILITY_IBSS;
 732
 733                 if (ifibss->privacy)
 734                         capability |= WLAN_CAPABILITY_PRIVACY;
 735
 736                 cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->chandef.chan,
 737                                         ifibss->bssid, ifibss->ssid,
 738                                         ifibss->ssid_len, WLAN_CAPABILITY_IBSS |
 739                                         WLAN_CAPABILITY_PRIVACY,
 740                                         capability);
 741
 742                 if (cbss) {
 743                         cfg80211_unlink_bss(local->hw.wiphy, cbss);
 744                         cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
 745                 }
 746         }
 747
 748         ifibss->state = IEEE80211_IBSS_MLME_SEARCH;
 749
 750         sta_info_flush(sdata);
 751
 752         spin_lock_bh(&ifibss->incomplete_lock);
 753         while (!list_empty(&ifibss->incomplete_stations)) {
 754                 sta = list_first_entry(&ifibss->incomplete_stations,
 755                                        struct sta_info, list);
 756                 list_del(&sta->list);
 757                 spin_unlock_bh(&ifibss->incomplete_lock);
 758
 759                 sta_info_free(local, sta);
 760                 spin_lock_bh(&ifibss->incomplete_lock);
 761         }
 762         spin_unlock_bh(&ifibss->incomplete_lock);
 763
 764         netif_carrier_off(sdata->dev);
 765
 766         sdata->vif.bss_conf.ibss_joined = false;
 767         sdata->vif.bss_conf.ibss_creator = false;
 768         sdata->vif.bss_conf.enable_beacon = false;
 769         sdata->vif.bss_conf.ssid_len = 0;
 770
 771         /* remove beacon */
 772         presp = rcu_dereference_protected(ifibss->presp,
 773                                           lockdep_is_held(&sdata->wdev.mtx));
 774         RCU_INIT_POINTER(sdata->u.ibss.presp, NULL);
 775         if (presp)
 776                 kfree_rcu(presp, rcu_head);
 777
 778         clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state);
 779         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED |
 780                                                 BSS_CHANGED_IBSS);
 781         drv_leave_ibss(local, sdata);
 782         ieee80211_vif_release_channel(sdata);
 783 }
 784
 785 static void ieee80211_csa_connection_drop_work(struct work_struct *work)
 786 {
 787         struct ieee80211_sub_if_data *sdata =
 788                 container_of(work, struct ieee80211_sub_if_data,
 789                              u.ibss.csa_connection_drop_work);
 790
 791         ieee80211_ibss_disconnect(sdata);
 792         synchronize_rcu();
 793         skb_queue_purge(&sdata->skb_queue);
 794
 795         /* trigger a scan to find another IBSS network to join */
 796         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
 797 }
 798
 799 static bool
 800 ieee80211_ibss_process_chanswitch(struct ieee80211_sub_if_data *sdata,
 801                                   struct ieee802_11_elems *elems,
 802                                   bool beacon)
 803 {
 804         struct cfg80211_csa_settings params;
 805         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 806         struct ieee80211_chanctx_conf *chanctx_conf;
 807         struct ieee80211_chanctx *chanctx;
 808         enum nl80211_channel_type ch_type;
 809         int err, num_chanctx;
 810         u32 sta_flags;
 811         u8 mode;
 812
 813         if (sdata->vif.csa_active)
 814                 return true;
 815
 816         if (!sdata->vif.bss_conf.ibss_joined)
 817                 return false;
 818
 819         sta_flags = IEEE80211_STA_DISABLE_VHT;
 820         switch (ifibss->chandef.width) {
 821         case NL80211_CHAN_WIDTH_5:
 822         case NL80211_CHAN_WIDTH_10:
 823         case NL80211_CHAN_WIDTH_20_NOHT:
 824                 sta_flags |= IEEE80211_STA_DISABLE_HT;
 825                 /* fall through */
 826         case NL80211_CHAN_WIDTH_20:
 827                 sta_flags |= IEEE80211_STA_DISABLE_40MHZ;
 828                 break;
 829         default:
 830                 break;
 831         }
 832
 833         memset(&params, 0, sizeof(params));
 834         err = ieee80211_parse_ch_switch_ie(sdata, elems, beacon,
 835                                            ifibss->chandef.chan->band,
 836                                            sta_flags, ifibss->bssid,
 837                                            &params.count, &mode,
 838                                            &params.chandef);
 839
 840         /* can't switch to destination channel, fail */
 841         if (err < 0)
 842                 goto disconnect;
 843
 844         /* did not contain a CSA */
 845         if (err)
 846                 return false;
 847
 848         if (ifibss->chandef.chan->band != params.chandef.chan->band)
 849                 goto disconnect;
 850
 851         switch (ifibss->chandef.width) {
 852         case NL80211_CHAN_WIDTH_20_NOHT:
 853         case NL80211_CHAN_WIDTH_20:
 854         case NL80211_CHAN_WIDTH_40:
 855                 /* keep our current HT mode (HT20/HT40+/HT40-), even if
 856                  * another mode  has been announced. The mode is not adopted
 857                  * within the beacon while doing CSA and we should therefore
 858                  * keep the mode which we announce.
 859                  */
 860                 ch_type = cfg80211_get_chandef_type(&ifibss->chandef);
 861                 cfg80211_chandef_create(&params.chandef, params.chandef.chan,
 862                                         ch_type);
 863                 break;
 864         case NL80211_CHAN_WIDTH_5:
 865         case NL80211_CHAN_WIDTH_10:
 866                 if (params.chandef.width != ifibss->chandef.width) {
 867                         sdata_info(sdata,
 868                                    "IBSS %pM received channel switch from incompatible channel width (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
 869                                    ifibss->bssid,
 870                                    params.chandef.chan->center_freq,
 871                                    params.chandef.width,
 872                                    params.chandef.center_freq1,
 873                                    params.chandef.center_freq2);
 874                         goto disconnect;
 875                 }
 876                 break;
 877         default:
 878                 /* should not happen, sta_flags should prevent VHT modes. */
 879                 WARN_ON(1);
 880                 goto disconnect;
 881         }
 882
 883         if (!cfg80211_chandef_usable(sdata->local->hw.wiphy, &params.chandef,
 884                                      IEEE80211_CHAN_DISABLED)) {
 885                 sdata_info(sdata,
 886                            "IBSS %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
 887                            ifibss->bssid,
 888                            params.chandef.chan->center_freq,
 889                            params.chandef.width,
 890                            params.chandef.center_freq1,
 891                            params.chandef.center_freq2);
 892                 goto disconnect;
 893         }
 894
 895         err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
 896                                             &params.chandef);
 897         if (err < 0)
 898                 goto disconnect;
 899         if (err) {
 900                 params.radar_required = true;
 901
 902                 /* TODO: IBSS-DFS not (yet) supported, disconnect. */
 903                 goto disconnect;
 904         }
 905
 906         rcu_read_lock();
 907         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 908         if (!chanctx_conf) {
 909                 rcu_read_unlock();
 910                 goto disconnect;
 911         }
 912
 913         /* don't handle for multi-VIF cases */
 914         chanctx = container_of(chanctx_conf, struct ieee80211_chanctx, conf);
 915         if (chanctx->refcount > 1) {
 916                 rcu_read_unlock();
 917                 goto disconnect;
 918         }
 919         num_chanctx = 0;
 920         list_for_each_entry_rcu(chanctx, &sdata->local->chanctx_list, list)
 921                 num_chanctx++;
 922
 923         if (num_chanctx > 1) {
 924                 rcu_read_unlock();
 925                 goto disconnect;
 926         }
 927         rcu_read_unlock();
 928
 929         /* all checks done, now perform the channel switch. */
 930         ibss_dbg(sdata,
 931                  "received channel switch announcement to go to channel %d MHz\n",
 932                  params.chandef.chan->center_freq);
 933
 934         params.block_tx = !!mode;
 935
 936         ieee80211_ibss_csa_beacon(sdata, &params);
 937         sdata->csa_radar_required = params.radar_required;
 938
 939         if (params.block_tx)
 940                 ieee80211_stop_queues_by_reason(&sdata->local->hw,
 941                                 IEEE80211_MAX_QUEUE_MAP,
 942                                 IEEE80211_QUEUE_STOP_REASON_CSA);
 943
 944         sdata->local->csa_chandef = params.chandef;
 945         sdata->vif.csa_active = true;
 946
 947         ieee80211_bss_info_change_notify(sdata, err);
 948         drv_channel_switch_beacon(sdata, &params.chandef);
 949
 950         return true;
 951 disconnect:
 952         ibss_dbg(sdata, "Can't handle channel switch, disconnect\n");
 953         ieee80211_queue_work(&sdata->local->hw,
 954                              &ifibss->csa_connection_drop_work);
 955
 956         return true;
 957 }
 958
 959 static void
 960 ieee80211_rx_mgmt_spectrum_mgmt(struct ieee80211_sub_if_data *sdata,
 961                                 struct ieee80211_mgmt *mgmt, size_t len,
 962                                 struct ieee80211_rx_status *rx_status,
 963                                 struct ieee802_11_elems *elems)
 964 {
 965         int required_len;
 966
 967         if (len < IEEE80211_MIN_ACTION_SIZE + 1)
 968                 return;
 969
 970         /* CSA is the only action we handle for now */
 971         if (mgmt->u.action.u.measurement.action_code !=
 972             WLAN_ACTION_SPCT_CHL_SWITCH)
 973                 return;
 974
 975         required_len = IEEE80211_MIN_ACTION_SIZE +
 976                        sizeof(mgmt->u.action.u.chan_switch);
 977         if (len < required_len)
 978                 return;
 979
 980         ieee80211_ibss_process_chanswitch(sdata, elems, false);
 981 }
 982
 983 static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data *sdata,
 984                                           struct ieee80211_mgmt *mgmt,
 985                                           size_t len)
 986 {
 987         u16 reason = le16_to_cpu(mgmt->u.deauth.reason_code);
 988
 989         if (len < IEEE80211_DEAUTH_FRAME_LEN)
 990                 return;
 991
 992         ibss_dbg(sdata, "RX DeAuth SA=%pM DA=%pM BSSID=%pM (reason: %d)\n",
 993                  mgmt->sa, mgmt->da, mgmt->bssid, reason);
 994         sta_info_destroy_addr(sdata, mgmt->sa);
 995 }
 996
 997 static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata,
 998                                         struct ieee80211_mgmt *mgmt,
 999                                         size_t len)
1000 {
1001         u16 auth_alg, auth_transaction;
1002
1003         sdata_assert_lock(sdata);
1004
1005         if (len < 24 + 6)
1006                 return;
1007
1008         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
1009         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
1010
1011         ibss_dbg(sdata,
1012                  "RX Auth SA=%pM DA=%pM BSSID=%pM (auth_transaction=%d)\n",
1013                  mgmt->sa, mgmt->da, mgmt->bssid, auth_transaction);
1014
1015         if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
1016                 return;
1017
1018         /*
1019          * IEEE 802.11 standard does not require authentication in IBSS
1020          * networks and most implementations do not seem to use it.
1021          * However, try to reply to authentication attempts if someone
1022          * has actually implemented this.
1023          */
1024         ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, 0, NULL, 0,
1025                             mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0, 0);
1026 }
1027
1028 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1029                                   struct ieee80211_mgmt *mgmt, size_t len,
1030                                   struct ieee80211_rx_status *rx_status,
1031                                   struct ieee802_11_elems *elems)
1032 {
1033         struct ieee80211_local *local = sdata->local;
1034         int freq;
1035         struct cfg80211_bss *cbss;
1036         struct ieee80211_bss *bss;
1037         struct sta_info *sta;
1038         struct ieee80211_channel *channel;
1039         u64 beacon_timestamp, rx_timestamp;
1040         u32 supp_rates = 0;
1041         enum ieee80211_band band = rx_status->band;
1042         enum nl80211_bss_scan_width scan_width;
1043         struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band];
1044         bool rates_updated = false;
1045
1046         if (elems->ds_params)
1047                 freq = ieee80211_channel_to_frequency(elems->ds_params[0],
1048                                                       band);
1049         else
1050                 freq = rx_status->freq;
1051
1052         channel = ieee80211_get_channel(local->hw.wiphy, freq);
1053
1054         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1055                 return;
1056
1057         if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
1058             ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid)) {
1059
1060                 rcu_read_lock();
1061                 sta = sta_info_get(sdata, mgmt->sa);
1062
1063                 if (elems->supp_rates) {
1064                         supp_rates = ieee80211_sta_get_rates(sdata, elems,
1065                                                              band, NULL);
1066                         if (sta) {
1067                                 u32 prev_rates;
1068
1069                                 prev_rates = sta->sta.supp_rates[band];
1070                                 /* make sure mandatory rates are always added */
1071                                 scan_width = NL80211_BSS_CHAN_WIDTH_20;
1072                                 if (rx_status->flag & RX_FLAG_5MHZ)
1073                                         scan_width = NL80211_BSS_CHAN_WIDTH_5;
1074                                 if (rx_status->flag & RX_FLAG_10MHZ)
1075                                         scan_width = NL80211_BSS_CHAN_WIDTH_10;
1076
1077                                 sta->sta.supp_rates[band] = supp_rates |
1078                                         ieee80211_mandatory_rates(sband,
1079                                                                   scan_width);
1080                                 if (sta->sta.supp_rates[band] != prev_rates) {
1081                                         ibss_dbg(sdata,
1082                                                  "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n",
1083                                                  sta->sta.addr, prev_rates,
1084                                                  sta->sta.supp_rates[band]);
1085                                         rates_updated = true;
1086                                 }
1087                         } else {
1088                                 rcu_read_unlock();
1089                                 sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid,
1090                                                 mgmt->sa, supp_rates);
1091                         }
1092                 }
1093
1094                 if (sta && elems->wmm_info)
1095                         set_sta_flag(sta, WLAN_STA_WME);
1096
1097                 if (sta && elems->ht_operation && elems->ht_cap_elem &&
1098                     sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20_NOHT &&
1099                     sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_5 &&
1100                     sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_10) {
1101                         /* we both use HT */
1102                         struct ieee80211_ht_cap htcap_ie;
1103                         struct cfg80211_chan_def chandef;
1104
1105                         ieee80211_ht_oper_to_chandef(channel,
1106                                                      elems->ht_operation,
1107                                                      &chandef);
1108
1109                         memcpy(&htcap_ie, elems->ht_cap_elem, sizeof(htcap_ie));
1110
1111                         /*
1112                          * fall back to HT20 if we don't use or use
1113                          * the other extension channel
1114                          */
1115                         if (chandef.center_freq1 !=
1116                             sdata->u.ibss.chandef.center_freq1)
1117                                 htcap_ie.cap_info &=
1118                                         cpu_to_le16(~IEEE80211_HT_CAP_SUP_WIDTH_20_40);
1119
1120                         rates_updated |= ieee80211_ht_cap_ie_to_sta_ht_cap(
1121                                                 sdata, sband, &htcap_ie, sta);
1122                 }
1123
1124                 if (sta && rates_updated) {
1125                         drv_sta_rc_update(local, sdata, &sta->sta,
1126                                           IEEE80211_RC_SUPP_RATES_CHANGED);
1127                         rate_control_rate_init(sta);
1128                 }
1129
1130                 rcu_read_unlock();
1131         }
1132
1133         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1134                                         channel);
1135         if (!bss)
1136                 return;
1137
1138         cbss = container_of((void *)bss, struct cfg80211_bss, priv);
1139
1140         /* same for beacon and probe response */
1141         beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp);
1142
1143         /* check if we need to merge IBSS */
1144
1145         /* not an IBSS */
1146         if (!(cbss->capability & WLAN_CAPABILITY_IBSS))
1147                 goto put_bss;
1148
1149         /* different channel */
1150         if (sdata->u.ibss.fixed_channel &&
1151             sdata->u.ibss.chandef.chan != cbss->channel)
1152                 goto put_bss;
1153
1154         /* different SSID */
1155         if (elems->ssid_len != sdata->u.ibss.ssid_len ||
1156             memcmp(elems->ssid, sdata->u.ibss.ssid,
1157                                 sdata->u.ibss.ssid_len))
1158                 goto put_bss;
1159
1160         /* process channel switch */
1161         if (ieee80211_ibss_process_chanswitch(sdata, elems, true))
1162                 goto put_bss;
1163
1164         /* same BSSID */
1165         if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid))
1166                 goto put_bss;
1167
1168         /* we use a fixed BSSID */
1169         if (sdata->u.ibss.fixed_bssid)
1170                 goto put_bss;
1171
1172         if (ieee80211_have_rx_timestamp(rx_status)) {
1173                 /* time when timestamp field was received */
1174                 rx_timestamp =
1175                         ieee80211_calculate_rx_timestamp(local, rx_status,
1176                                                          len + FCS_LEN, 24);
1177         } else {
1178                 /*
1179                  * second best option: get current TSF
1180                  * (will return -1 if not supported)
1181                  */
1182                 rx_timestamp = drv_get_tsf(local, sdata);
1183         }
1184
1185         ibss_dbg(sdata,
1186                  "RX beacon SA=%pM BSSID=%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
1187                  mgmt->sa, mgmt->bssid,
1188                  (unsigned long long)rx_timestamp,
1189                  (unsigned long long)beacon_timestamp,
1190                  (unsigned long long)(rx_timestamp - beacon_timestamp),
1191                  jiffies);
1192
1193         if (beacon_timestamp > rx_timestamp) {
1194                 ibss_dbg(sdata,
1195                          "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n",
1196                          mgmt->bssid);
1197                 ieee80211_sta_join_ibss(sdata, bss);
1198                 supp_rates = ieee80211_sta_get_rates(sdata, elems, band, NULL);
1199                 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa,
1200                                        supp_rates);
1201                 rcu_read_unlock();
1202         }
1203
1204  put_bss:
1205         ieee80211_rx_bss_put(local, bss);
1206 }
1207
1208 void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata,
1209                               const u8 *bssid, const u8 *addr,
1210                               u32 supp_rates)
1211 {
1212         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1213         struct ieee80211_local *local = sdata->local;
1214         struct sta_info *sta;
1215         struct ieee80211_chanctx_conf *chanctx_conf;
1216         struct ieee80211_supported_band *sband;
1217         enum nl80211_bss_scan_width scan_width;
1218         int band;
1219
1220         /*
1221          * XXX: Consider removing the least recently used entry and
1222          *      allow new one to be added.
1223          */
1224         if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
1225                 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
1226                                     sdata->name, addr);
1227                 return;
1228         }
1229
1230         if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH)
1231                 return;
1232
1233         if (!ether_addr_equal(bssid, sdata->u.ibss.bssid))
1234                 return;
1235
1236         rcu_read_lock();
1237         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1238         if (WARN_ON_ONCE(!chanctx_conf)) {
1239                 rcu_read_unlock();
1240                 return;
1241         }
1242         band = chanctx_conf->def.chan->band;
1243         scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
1244         rcu_read_unlock();
1245
1246         sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
1247         if (!sta)
1248                 return;
1249
1250         sta->last_rx = jiffies;
1251
1252         /* make sure mandatory rates are always added */
1253         sband = local->hw.wiphy->bands[band];
1254         sta->sta.supp_rates[band] = supp_rates |
1255                         ieee80211_mandatory_rates(sband, scan_width);
1256
1257         spin_lock(&ifibss->incomplete_lock);
1258         list_add(&sta->list, &ifibss->incomplete_stations);
1259         spin_unlock(&ifibss->incomplete_lock);
1260         ieee80211_queue_work(&local->hw, &sdata->work);
1261 }
1262
1263 static void ieee80211_ibss_sta_expire(struct ieee80211_sub_if_data *sdata)
1264 {
1265         struct ieee80211_local *local = sdata->local;
1266         struct sta_info *sta, *tmp;
1267         unsigned long exp_time = IEEE80211_IBSS_INACTIVITY_LIMIT;
1268         unsigned long exp_rsn_time = IEEE80211_IBSS_RSN_INACTIVITY_LIMIT;
1269
1270         mutex_lock(&local->sta_mtx);
1271
1272         list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
1273                 if (sdata != sta->sdata)
1274                         continue;
1275
1276                 if (time_after(jiffies, sta->last_rx + exp_time) ||
1277                     (time_after(jiffies, sta->last_rx + exp_rsn_time) &&
1278                      sta->sta_state != IEEE80211_STA_AUTHORIZED)) {
1279                         sta_dbg(sta->sdata, "expiring inactive %sSTA %pM\n",
1280                                 sta->sta_state != IEEE80211_STA_AUTHORIZED ?
1281                                 "not authorized " : "", sta->sta.addr);
1282
1283                         WARN_ON(__sta_info_destroy(sta));
1284                 }
1285         }
1286
1287         mutex_unlock(&local->sta_mtx);
1288 }
1289
1290 /*
1291  * This function is called with state == IEEE80211_IBSS_MLME_JOINED
1292  */
1293
1294 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
1295 {
1296         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1297         enum nl80211_bss_scan_width scan_width;
1298
1299         sdata_assert_lock(sdata);
1300
1301         mod_timer(&ifibss->timer,
1302                   round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
1303
1304         ieee80211_ibss_sta_expire(sdata);
1305
1306         if (time_before(jiffies, ifibss->last_scan_completed +
1307                        IEEE80211_IBSS_MERGE_INTERVAL))
1308                 return;
1309
1310         if (ieee80211_sta_active_ibss(sdata))
1311                 return;
1312
1313         if (ifibss->fixed_channel)
1314                 return;
1315
1316         sdata_info(sdata,
1317                    "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n");
1318
1319         scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
1320         ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len,
1321                                     NULL, scan_width);
1322 }
1323
1324 static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
1325 {
1326         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1327         u8 bssid[ETH_ALEN];
1328         u16 capability;
1329         int i;
1330
1331         sdata_assert_lock(sdata);
1332
1333         if (ifibss->fixed_bssid) {
1334                 memcpy(bssid, ifibss->bssid, ETH_ALEN);
1335         } else {
1336                 /* Generate random, not broadcast, locally administered BSSID. Mix in
1337                  * own MAC address to make sure that devices that do not have proper
1338                  * random number generator get different BSSID. */
1339                 get_random_bytes(bssid, ETH_ALEN);
1340                 for (i = 0; i < ETH_ALEN; i++)
1341                         bssid[i] ^= sdata->vif.addr[i];
1342                 bssid[0] &= ~0x01;
1343                 bssid[0] |= 0x02;
1344         }
1345
1346         sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid);
1347
1348         capability = WLAN_CAPABILITY_IBSS;
1349
1350         if (ifibss->privacy)
1351                 capability |= WLAN_CAPABILITY_PRIVACY;
1352         else
1353                 sdata->drop_unencrypted = 0;
1354
1355         __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int,
1356                                   &ifibss->chandef, ifibss->basic_rates,
1357                                   capability, 0, true);
1358 }
1359
1360 /*
1361  * This function is called with state == IEEE80211_IBSS_MLME_SEARCH
1362  */
1363
1364 static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
1365 {
1366         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1367         struct ieee80211_local *local = sdata->local;
1368         struct cfg80211_bss *cbss;
1369         struct ieee80211_channel *chan = NULL;
1370         const u8 *bssid = NULL;
1371         enum nl80211_bss_scan_width scan_width;
1372         int active_ibss;
1373         u16 capability;
1374
1375         sdata_assert_lock(sdata);
1376
1377         active_ibss = ieee80211_sta_active_ibss(sdata);
1378         ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss);
1379
1380         if (active_ibss)
1381                 return;
1382
1383         capability = WLAN_CAPABILITY_IBSS;
1384         if (ifibss->privacy)
1385                 capability |= WLAN_CAPABILITY_PRIVACY;
1386         if (ifibss->fixed_bssid)
1387                 bssid = ifibss->bssid;
1388         if (ifibss->fixed_channel)
1389                 chan = ifibss->chandef.chan;
1390         if (!is_zero_ether_addr(ifibss->bssid))
1391                 bssid = ifibss->bssid;
1392         cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid,
1393                                 ifibss->ssid, ifibss->ssid_len,
1394                                 WLAN_CAPABILITY_IBSS | WLAN_CAPABILITY_PRIVACY,
1395                                 capability);
1396
1397         if (cbss) {
1398                 struct ieee80211_bss *bss;
1399
1400                 bss = (void *)cbss->priv;
1401                 ibss_dbg(sdata,
1402                          "sta_find_ibss: selected %pM current %pM\n",
1403                          cbss->bssid, ifibss->bssid);
1404                 sdata_info(sdata,
1405                            "Selected IBSS BSSID %pM based on configured SSID\n",
1406                            cbss->bssid);
1407
1408                 ieee80211_sta_join_ibss(sdata, bss);
1409                 ieee80211_rx_bss_put(local, bss);
1410                 return;
1411         }
1412
1413         /* if a fixed bssid and a fixed freq have been provided create the IBSS
1414          * directly and do not waste time scanning
1415          */
1416         if (ifibss->fixed_bssid && ifibss->fixed_channel) {
1417                 sdata_info(sdata, "Created IBSS using preconfigured BSSID %pM\n",
1418                            bssid);
1419                 ieee80211_sta_create_ibss(sdata);
1420                 return;
1421         }
1422
1423
1424         ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n");
1425
1426         /* Selected IBSS not found in current scan results - try to scan */
1427         if (time_after(jiffies, ifibss->last_scan_completed +
1428                                         IEEE80211_SCAN_INTERVAL)) {
1429                 sdata_info(sdata, "Trigger new scan to find an IBSS to join\n");
1430
1431                 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
1432                 ieee80211_request_ibss_scan(sdata, ifibss->ssid,
1433                                             ifibss->ssid_len, chan,
1434                                             scan_width);
1435         } else {
1436                 int interval = IEEE80211_SCAN_INTERVAL;
1437
1438                 if (time_after(jiffies, ifibss->ibss_join_req +
1439                                IEEE80211_IBSS_JOIN_TIMEOUT))
1440                         ieee80211_sta_create_ibss(sdata);
1441
1442                 mod_timer(&ifibss->timer,
1443                           round_jiffies(jiffies + interval));
1444         }
1445 }
1446
1447 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
1448                                         struct sk_buff *req)
1449 {
1450         struct ieee80211_mgmt *mgmt = (void *)req->data;
1451         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1452         struct ieee80211_local *local = sdata->local;
1453         int tx_last_beacon, len = req->len;
1454         struct sk_buff *skb;
1455         struct beacon_data *presp;
1456         u8 *pos, *end;
1457
1458         sdata_assert_lock(sdata);
1459
1460         presp = rcu_dereference_protected(ifibss->presp,
1461                                           lockdep_is_held(&sdata->wdev.mtx));
1462
1463         if (ifibss->state != IEEE80211_IBSS_MLME_JOINED ||
1464             len < 24 + 2 || !presp)
1465                 return;
1466
1467         tx_last_beacon = drv_tx_last_beacon(local);
1468
1469         ibss_dbg(sdata,
1470                  "RX ProbeReq SA=%pM DA=%pM BSSID=%pM (tx_last_beacon=%d)\n",
1471                  mgmt->sa, mgmt->da, mgmt->bssid, tx_last_beacon);
1472
1473         if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da))
1474                 return;
1475
1476         if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) &&
1477             !is_broadcast_ether_addr(mgmt->bssid))
1478                 return;
1479
1480         end = ((u8 *) mgmt) + len;
1481         pos = mgmt->u.probe_req.variable;
1482         if (pos[0] != WLAN_EID_SSID ||
1483             pos + 2 + pos[1] > end) {
1484                 ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n",
1485                          mgmt->sa);
1486                 return;
1487         }
1488         if (pos[1] != 0 &&
1489             (pos[1] != ifibss->ssid_len ||
1490              memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) {
1491                 /* Ignore ProbeReq for foreign SSID */
1492                 return;
1493         }
1494
1495         /* Reply with ProbeResp */
1496         skb = dev_alloc_skb(local->tx_headroom + presp->head_len);
1497         if (!skb)
1498                 return;
1499
1500         skb_reserve(skb, local->tx_headroom);
1501         memcpy(skb_put(skb, presp->head_len), presp->head, presp->head_len);
1502
1503         memcpy(((struct ieee80211_mgmt *) skb->data)->da, mgmt->sa, ETH_ALEN);
1504         ibss_dbg(sdata, "Sending ProbeResp to %pM\n", mgmt->sa);
1505         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1506         ieee80211_tx_skb(sdata, skb);
1507 }
1508
1509 static
1510 void ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data *sdata,
1511                                     struct ieee80211_mgmt *mgmt, size_t len,
1512                                     struct ieee80211_rx_status *rx_status)
1513 {
1514         size_t baselen;
1515         struct ieee802_11_elems elems;
1516
1517         BUILD_BUG_ON(offsetof(typeof(mgmt->u.probe_resp), variable) !=
1518                      offsetof(typeof(mgmt->u.beacon), variable));
1519
1520         /*
1521          * either beacon or probe_resp but the variable field is at the
1522          * same offset
1523          */
1524         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1525         if (baselen > len)
1526                 return;
1527
1528         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1529                                false, &elems);
1530
1531         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
1532 }
1533
1534 void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1535                                    struct sk_buff *skb)
1536 {
1537         struct ieee80211_rx_status *rx_status;
1538         struct ieee80211_mgmt *mgmt;
1539         u16 fc;
1540         struct ieee802_11_elems elems;
1541         int ies_len;
1542
1543         rx_status = IEEE80211_SKB_RXCB(skb);
1544         mgmt = (struct ieee80211_mgmt *) skb->data;
1545         fc = le16_to_cpu(mgmt->frame_control);
1546
1547         sdata_lock(sdata);
1548
1549         if (!sdata->u.ibss.ssid_len)
1550                 goto mgmt_out; /* not ready to merge yet */
1551
1552         switch (fc & IEEE80211_FCTL_STYPE) {
1553         case IEEE80211_STYPE_PROBE_REQ:
1554                 ieee80211_rx_mgmt_probe_req(sdata, skb);
1555                 break;
1556         case IEEE80211_STYPE_PROBE_RESP:
1557         case IEEE80211_STYPE_BEACON:
1558                 ieee80211_rx_mgmt_probe_beacon(sdata, mgmt, skb->len,
1559                                                rx_status);
1560                 break;
1561         case IEEE80211_STYPE_AUTH:
1562                 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len);
1563                 break;
1564         case IEEE80211_STYPE_DEAUTH:
1565                 ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len);
1566                 break;
1567         case IEEE80211_STYPE_ACTION:
1568                 switch (mgmt->u.action.category) {
1569                 case WLAN_CATEGORY_SPECTRUM_MGMT:
1570                         ies_len = skb->len -
1571                                   offsetof(struct ieee80211_mgmt,
1572                                            u.action.u.chan_switch.variable);
1573
1574                         if (ies_len < 0)
1575                                 break;
1576
1577                         ieee802_11_parse_elems(
1578                                 mgmt->u.action.u.chan_switch.variable,
1579                                 ies_len, true, &elems);
1580
1581                         if (elems.parse_error)
1582                                 break;
1583
1584                         ieee80211_rx_mgmt_spectrum_mgmt(sdata, mgmt, skb->len,
1585                                                         rx_status, &elems);
1586                         break;
1587                 }
1588         }
1589
1590  mgmt_out:
1591         sdata_unlock(sdata);
1592 }
1593
1594 void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata)
1595 {
1596         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1597         struct sta_info *sta;
1598
1599         sdata_lock(sdata);
1600
1601         /*
1602          * Work could be scheduled after scan or similar
1603          * when we aren't even joined (or trying) with a
1604          * network.
1605          */
1606         if (!ifibss->ssid_len)
1607                 goto out;
1608
1609         spin_lock_bh(&ifibss->incomplete_lock);
1610         while (!list_empty(&ifibss->incomplete_stations)) {
1611                 sta = list_first_entry(&ifibss->incomplete_stations,
1612                                        struct sta_info, list);
1613                 list_del(&sta->list);
1614                 spin_unlock_bh(&ifibss->incomplete_lock);
1615
1616                 ieee80211_ibss_finish_sta(sta);
1617                 rcu_read_unlock();
1618                 spin_lock_bh(&ifibss->incomplete_lock);
1619         }
1620         spin_unlock_bh(&ifibss->incomplete_lock);
1621
1622         switch (ifibss->state) {
1623         case IEEE80211_IBSS_MLME_SEARCH:
1624                 ieee80211_sta_find_ibss(sdata);
1625                 break;
1626         case IEEE80211_IBSS_MLME_JOINED:
1627                 ieee80211_sta_merge_ibss(sdata);
1628                 break;
1629         default:
1630                 WARN_ON(1);
1631                 break;
1632         }
1633
1634  out:
1635         sdata_unlock(sdata);
1636 }
1637
1638 static void ieee80211_ibss_timer(unsigned long data)
1639 {
1640         struct ieee80211_sub_if_data *sdata =
1641                 (struct ieee80211_sub_if_data *) data;
1642
1643         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1644 }
1645
1646 void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata)
1647 {
1648         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1649
1650         setup_timer(&ifibss->timer, ieee80211_ibss_timer,
1651                     (unsigned long) sdata);
1652         INIT_LIST_HEAD(&ifibss->incomplete_stations);
1653         spin_lock_init(&ifibss->incomplete_lock);
1654         INIT_WORK(&ifibss->csa_connection_drop_work,
1655                   ieee80211_csa_connection_drop_work);
1656 }
1657
1658 /* scan finished notification */
1659 void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local)
1660 {
1661         struct ieee80211_sub_if_data *sdata;
1662
1663         mutex_lock(&local->iflist_mtx);
1664         list_for_each_entry(sdata, &local->interfaces, list) {
1665                 if (!ieee80211_sdata_running(sdata))
1666                         continue;
1667                 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
1668                         continue;
1669                 sdata->u.ibss.last_scan_completed = jiffies;
1670                 ieee80211_queue_work(&local->hw, &sdata->work);
1671         }
1672         mutex_unlock(&local->iflist_mtx);
1673 }
1674
1675 int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
1676                         struct cfg80211_ibss_params *params)
1677 {
1678         u32 changed = 0;
1679         u32 rate_flags;
1680         struct ieee80211_supported_band *sband;
1681         int i;
1682
1683         if (params->bssid) {
1684                 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN);
1685                 sdata->u.ibss.fixed_bssid = true;
1686         } else
1687                 sdata->u.ibss.fixed_bssid = false;
1688
1689         sdata->u.ibss.privacy = params->privacy;
1690         sdata->u.ibss.control_port = params->control_port;
1691         sdata->u.ibss.basic_rates = params->basic_rates;
1692
1693         /* fix basic_rates if channel does not support these rates */
1694         rate_flags = ieee80211_chandef_rate_flags(&params->chandef);
1695         sband = sdata->local->hw.wiphy->bands[params->chandef.chan->band];
1696         for (i = 0; i < sband->n_bitrates; i++) {
1697                 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
1698                         sdata->u.ibss.basic_rates &= ~BIT(i);
1699         }
1700         memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate,
1701                sizeof(params->mcast_rate));
1702
1703         sdata->vif.bss_conf.beacon_int = params->beacon_interval;
1704
1705         sdata->u.ibss.chandef = params->chandef;
1706         sdata->u.ibss.fixed_channel = params->channel_fixed;
1707
1708         if (params->ie) {
1709                 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len,
1710                                            GFP_KERNEL);
1711                 if (sdata->u.ibss.ie)
1712                         sdata->u.ibss.ie_len = params->ie_len;
1713         }
1714
1715         sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
1716         sdata->u.ibss.ibss_join_req = jiffies;
1717
1718         memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len);
1719         sdata->u.ibss.ssid_len = params->ssid_len;
1720
1721         memcpy(&sdata->u.ibss.ht_capa, &params->ht_capa,
1722                sizeof(sdata->u.ibss.ht_capa));
1723         memcpy(&sdata->u.ibss.ht_capa_mask, &params->ht_capa_mask,
1724                sizeof(sdata->u.ibss.ht_capa_mask));
1725
1726         /*
1727          * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is
1728          * reserved, but an HT STA shall protect HT transmissions as though
1729          * the HT Protection field were set to non-HT mixed mode.
1730          *
1731          * In an IBSS, the RIFS Mode field of the HT Operation element is
1732          * also reserved, but an HT STA shall operate as though this field
1733          * were set to 1.
1734          */
1735
1736         sdata->vif.bss_conf.ht_operation_mode |=
1737                   IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED
1738                 | IEEE80211_HT_PARAM_RIFS_MODE;
1739
1740         changed |= BSS_CHANGED_HT;
1741         ieee80211_bss_info_change_notify(sdata, changed);
1742
1743         sdata->smps_mode = IEEE80211_SMPS_OFF;
1744         sdata->needed_rx_chains = sdata->local->rx_chains;
1745
1746         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1747
1748         return 0;
1749 }
1750
1751 int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata)
1752 {
1753         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1754
1755         ieee80211_ibss_disconnect(sdata);
1756         ifibss->ssid_len = 0;
1757         memset(ifibss->bssid, 0, ETH_ALEN);
1758
1759         /* remove beacon */
1760         kfree(sdata->u.ibss.ie);
1761
1762         /* on the next join, re-program HT parameters */
1763         memset(&ifibss->ht_capa, 0, sizeof(ifibss->ht_capa));
1764         memset(&ifibss->ht_capa_mask, 0, sizeof(ifibss->ht_capa_mask));
1765
1766         synchronize_rcu();
1767
1768         skb_queue_purge(&sdata->skb_queue);
1769
1770         del_timer_sync(&sdata->u.ibss.timer);
1771
1772         return 0;
1773 }