1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * IBSS mode implementation
   4 * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
   5 * Copyright 2004, Instant802 Networks, Inc.
   6 * Copyright 2005, Devicescape Software, Inc.
   7 * Copyright 2006-2007	Jiri Benc <jbenc@suse.cz>
   8 * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
   9 * Copyright 2009, Johannes Berg <johannes@sipsolutions.net>
  10 * Copyright 2013-2014  Intel Mobile Communications GmbH
  11 * Copyright(c) 2016 Intel Deutschland GmbH
  12 * Copyright(c) 2018-2023 Intel Corporation
  13 */
  14
  15#include <linux/delay.h>
  16#include <linux/slab.h>
  17#include <linux/if_ether.h>
  18#include <linux/skbuff.h>
  19#include <linux/if_arp.h>
  20#include <linux/etherdevice.h>
  21#include <linux/rtnetlink.h>
  22#include <net/mac80211.h>
  23
  24#include "ieee80211_i.h"
  25#include "driver-ops.h"
  26#include "rate.h"
  27
  28#define IEEE80211_SCAN_INTERVAL (2 * HZ)
  29#define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ)
  30
  31#define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ)
  32#define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ)
  33#define IEEE80211_IBSS_RSN_INACTIVITY_LIMIT (10 * HZ)
  34
  35#define IEEE80211_IBSS_MAX_STA_ENTRIES 128
  36
  37static struct beacon_data *
  38ieee80211_ibss_build_presp(struct ieee80211_sub_if_data *sdata,
  39			   const int beacon_int, const u32 basic_rates,
  40			   const u16 capability, u64 tsf,
  41			   struct cfg80211_chan_def *chandef,
  42			   bool *have_higher_than_11mbit,
  43			   struct cfg80211_csa_settings *csa_settings)
  44{
  45	struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
  46	struct ieee80211_local *local = sdata->local;
  47	int rates_n = 0, i, ri;
  48	struct ieee80211_mgmt *mgmt;
  49	u8 *pos;
  50	struct ieee80211_supported_band *sband;
  51	u32 rate_flags, rates = 0, rates_added = 0;
  52	struct beacon_data *presp;
  53	int frame_len;
  54
  55	/* Build IBSS probe response */
  56	frame_len = sizeof(struct ieee80211_hdr_3addr) +
  57		    12 /* struct ieee80211_mgmt.u.beacon */ +
  58		    2 + IEEE80211_MAX_SSID_LEN /* max SSID */ +
  59		    2 + 8 /* max Supported Rates */ +
  60		    3 /* max DS params */ +
  61		    4 /* IBSS params */ +
  62		    5 /* Channel Switch Announcement */ +
  63		    2 + (IEEE80211_MAX_SUPP_RATES - 8) +
  64		    2 + sizeof(struct ieee80211_ht_cap) +
  65		    2 + sizeof(struct ieee80211_ht_operation) +
  66		    2 + sizeof(struct ieee80211_vht_cap) +
  67		    2 + sizeof(struct ieee80211_vht_operation) +
  68		    ifibss->ie_len;
  69	presp = kzalloc(sizeof(*presp) + frame_len, GFP_KERNEL);
  70	if (!presp)
  71		return NULL;
  72
  73	presp->head = (void *)(presp + 1);
  74
  75	mgmt = (void *) presp->head;
  76	mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
  77					  IEEE80211_STYPE_PROBE_RESP);
  78	eth_broadcast_addr(mgmt->da);
  79	memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
  80	memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN);
  81	mgmt->u.beacon.beacon_int = cpu_to_le16(beacon_int);
  82	mgmt->u.beacon.timestamp = cpu_to_le64(tsf);
  83	mgmt->u.beacon.capab_info = cpu_to_le16(capability);
  84
  85	pos = (u8 *)mgmt + offsetof(struct ieee80211_mgmt, u.beacon.variable);
  86
  87	*pos++ = WLAN_EID_SSID;
  88	*pos++ = ifibss->ssid_len;
  89	memcpy(pos, ifibss->ssid, ifibss->ssid_len);
  90	pos += ifibss->ssid_len;
  91
  92	sband = local->hw.wiphy->bands[chandef->chan->band];
  93	rate_flags = ieee80211_chandef_rate_flags(chandef);
  94	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, 5);
 113		u8 basic = 0;
 114		if (!(rates & BIT(ri)))
 115			continue;
 116
 117		if (basic_rates & BIT(ri))
 118			basic = 0x80;
 119		*pos++ = basic | (u8) rate;
 120		if (++rates_added == 8) {
 121			ri++; /* continue at next rate for EXT_SUPP_RATES */
 122			break;
 123		}
 124	}
 125
 126	if (sband->band == NL80211_BAND_2GHZ) {
 127		*pos++ = WLAN_EID_DS_PARAMS;
 128		*pos++ = 1;
 129		*pos++ = ieee80211_frequency_to_channel(
 130				chandef->chan->center_freq);
 131	}
 132
 133	*pos++ = WLAN_EID_IBSS_PARAMS;
 134	*pos++ = 2;
 135	/* FIX: set ATIM window based on scan results */
 136	*pos++ = 0;
 137	*pos++ = 0;
 138
 139	if (csa_settings) {
 140		*pos++ = WLAN_EID_CHANNEL_SWITCH;
 141		*pos++ = 3;
 142		*pos++ = csa_settings->block_tx ? 1 : 0;
 143		*pos++ = ieee80211_frequency_to_channel(
 144				csa_settings->chandef.chan->center_freq);
 145		presp->cntdwn_counter_offsets[0] = (pos - presp->head);
 146		*pos++ = csa_settings->count;
 147		presp->cntdwn_current_counter = 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, 5);
 156			u8 basic = 0;
 157			if (!(rates & BIT(ri)))
 158				continue;
 159
 160			if (basic_rates & BIT(ri))
 161				basic = 0x80;
 162			*pos++ = basic | (u8) rate;
 163		}
 164	}
 165
 166	if (ifibss->ie_len) {
 167		memcpy(pos, ifibss->ie, ifibss->ie_len);
 168		pos += ifibss->ie_len;
 169	}
 170
 171	/* add HT capability and information IEs */
 172	if (chandef->width != NL80211_CHAN_WIDTH_20_NOHT &&
 173	    chandef->width != NL80211_CHAN_WIDTH_5 &&
 174	    chandef->width != NL80211_CHAN_WIDTH_10 &&
 175	    sband->ht_cap.ht_supported) {
 176		struct ieee80211_sta_ht_cap ht_cap;
 177
 178		memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
 179		ieee80211_apply_htcap_overrides(sdata, &ht_cap);
 180
 181		pos = ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap);
 182		/*
 183		 * Note: According to 802.11n-2009 9.13.3.1, HT Protection
 184		 * field and RIFS Mode are reserved in IBSS mode, therefore
 185		 * keep them at 0
 186		 */
 187		pos = ieee80211_ie_build_ht_oper(pos, &sband->ht_cap,
 188						 chandef, 0, false);
 189
 190		/* add VHT capability and information IEs */
 191		if (chandef->width != NL80211_CHAN_WIDTH_20 &&
 192		    chandef->width != NL80211_CHAN_WIDTH_40 &&
 193		    sband->vht_cap.vht_supported) {
 194			pos = ieee80211_ie_build_vht_cap(pos, &sband->vht_cap,
 195							 sband->vht_cap.cap);
 196			pos = ieee80211_ie_build_vht_oper(pos, &sband->vht_cap,
 197							  chandef);
 198		}
 199	}
 200
 201	if (local->hw.queues >= IEEE80211_NUM_ACS)
 202		pos = ieee80211_add_wmm_info_ie(pos, 0); /* U-APSD not in use */
 203
 204	presp->head_len = pos - presp->head;
 205	if (WARN_ON(presp->head_len > frame_len))
 206		goto error;
 207
 208	return presp;
 209error:
 210	kfree(presp);
 211	return NULL;
 212}
 213
 214static 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_mgmt *mgmt;
 224	struct cfg80211_bss *bss;
 225	u64 bss_change;
 226	struct ieee80211_chan_req chanreq = {};
 227	struct ieee80211_channel *chan;
 228	struct beacon_data *presp;
 229	struct cfg80211_inform_bss bss_meta = {};
 230	bool have_higher_than_11mbit;
 231	bool radar_required;
 232	int err;
 233
 234	lockdep_assert_wiphy(local->hw.wiphy);
 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, -1);
 241
 242	/* if merging, indicate to driver that we leave the old IBSS */
 243	if (sdata->vif.cfg.ibss_joined) {
 244		sdata->vif.cfg.ibss_joined = false;
 245		sdata->vif.cfg.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 = sdata_dereference(ifibss->presp, sdata);
 255	RCU_INIT_POINTER(ifibss->presp, NULL);
 256	if (presp)
 257		kfree_rcu(presp, rcu_head);
 258
 259	/* make a copy of the chandef, it could be modified below. */
 260	chanreq.oper = *req_chandef;
 261	chan = chanreq.oper.chan;
 262	if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chanreq.oper,
 263				     NL80211_IFTYPE_ADHOC)) {
 264		if (chanreq.oper.width == NL80211_CHAN_WIDTH_5 ||
 265		    chanreq.oper.width == NL80211_CHAN_WIDTH_10 ||
 266		    chanreq.oper.width == NL80211_CHAN_WIDTH_20_NOHT ||
 267		    chanreq.oper.width == NL80211_CHAN_WIDTH_20) {
 268			sdata_info(sdata,
 269				   "Failed to join IBSS, beacons forbidden\n");
 270			return;
 271		}
 272		chanreq.oper.width = NL80211_CHAN_WIDTH_20;
 273		chanreq.oper.center_freq1 = chan->center_freq;
 274		/* check again for downgraded chandef */
 275		if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chanreq.oper,
 276					     NL80211_IFTYPE_ADHOC)) {
 277			sdata_info(sdata,
 278				   "Failed to join IBSS, beacons forbidden\n");
 279			return;
 280		}
 281	}
 282
 283	err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
 284					    &chanreq.oper, NL80211_IFTYPE_ADHOC);
 285	if (err < 0) {
 286		sdata_info(sdata,
 287			   "Failed to join IBSS, invalid chandef\n");
 288		return;
 289	}
 290	if (err > 0 && !ifibss->userspace_handles_dfs) {
 291		sdata_info(sdata,
 292			   "Failed to join IBSS, DFS channel without control program\n");
 293		return;
 294	}
 295
 296	radar_required = err;
 297
 298	if (ieee80211_link_use_channel(&sdata->deflink, &chanreq,
 299				       ifibss->fixed_channel ?
 300					IEEE80211_CHANCTX_SHARED :
 301					IEEE80211_CHANCTX_EXCLUSIVE)) {
 302		sdata_info(sdata, "Failed to join IBSS, no channel context\n");
 303		return;
 304	}
 305	sdata->deflink.radar_required = radar_required;
 306
 307	memcpy(ifibss->bssid, bssid, ETH_ALEN);
 308
 309	presp = ieee80211_ibss_build_presp(sdata, beacon_int, basic_rates,
 310					   capability, tsf, &chanreq.oper,
 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->vif.bss_conf.enable_beacon = true;
 319	sdata->vif.bss_conf.beacon_int = beacon_int;
 320	sdata->vif.bss_conf.basic_rates = basic_rates;
 321	sdata->vif.cfg.ssid_len = ifibss->ssid_len;
 322	memcpy(sdata->vif.cfg.ssid, ifibss->ssid, ifibss->ssid_len);
 323	bss_change = BSS_CHANGED_BEACON_INT;
 324	bss_change |= ieee80211_reset_erp_info(sdata);
 325	bss_change |= BSS_CHANGED_BSSID;
 326	bss_change |= BSS_CHANGED_BEACON;
 327	bss_change |= BSS_CHANGED_BEACON_ENABLED;
 328	bss_change |= BSS_CHANGED_BASIC_RATES;
 329	bss_change |= BSS_CHANGED_HT;
 330	bss_change |= BSS_CHANGED_IBSS;
 331	bss_change |= BSS_CHANGED_SSID;
 332
 333	/*
 334	 * In 5 GHz/802.11a, we can always use short slot time.
 335	 * (IEEE 802.11-2012 18.3.8.7)
 336	 *
 337	 * In 2.4GHz, we must always use long slots in IBSS for compatibility
 338	 * reasons.
 339	 * (IEEE 802.11-2012 19.4.5)
 340	 *
 341	 * HT follows these specifications (IEEE 802.11-2012 20.3.18)
 342	 */
 343	sdata->vif.bss_conf.use_short_slot = chan->band == NL80211_BAND_5GHZ;
 344	bss_change |= BSS_CHANGED_ERP_SLOT;
 345
 346	/* cf. IEEE 802.11 9.2.12 */
 347	sdata->deflink.operating_11g_mode =
 348		chan->band == NL80211_BAND_2GHZ && have_higher_than_11mbit;
 349
 350	ieee80211_set_wmm_default(&sdata->deflink, true, false);
 351
 352	sdata->vif.cfg.ibss_joined = true;
 353	sdata->vif.cfg.ibss_creator = creator;
 354
 355	err = drv_join_ibss(local, sdata);
 356	if (err) {
 357		sdata->vif.cfg.ibss_joined = false;
 358		sdata->vif.cfg.ibss_creator = false;
 359		sdata->vif.bss_conf.enable_beacon = false;
 360		sdata->vif.cfg.ssid_len = 0;
 361		RCU_INIT_POINTER(ifibss->presp, NULL);
 362		kfree_rcu(presp, rcu_head);
 363		ieee80211_link_release_channel(&sdata->deflink);
 364		sdata_info(sdata, "Failed to join IBSS, driver failure: %d\n",
 365			   err);
 366		return;
 367	}
 368
 369	ieee80211_bss_info_change_notify(sdata, bss_change);
 370
 371	ifibss->state = IEEE80211_IBSS_MLME_JOINED;
 372	mod_timer(&ifibss->timer,
 373		  round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
 374
 375	bss_meta.chan = chan;
 376	bss = cfg80211_inform_bss_frame_data(local->hw.wiphy, &bss_meta, mgmt,
 377					     presp->head_len, GFP_KERNEL);
 378
 379	cfg80211_put_bss(local->hw.wiphy, bss);
 380	netif_carrier_on(sdata->dev);
 381	cfg80211_ibss_joined(sdata->dev, ifibss->bssid, chan, GFP_KERNEL);
 382}
 383
 384static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
 385				    struct ieee80211_bss *bss)
 386{
 387	struct cfg80211_bss *cbss =
 388		container_of((void *)bss, struct cfg80211_bss, priv);
 389	struct ieee80211_supported_band *sband;
 390	struct cfg80211_chan_def chandef;
 391	u32 basic_rates;
 392	int i, j;
 393	u16 beacon_int = cbss->beacon_interval;
 394	const struct cfg80211_bss_ies *ies;
 395	enum nl80211_channel_type chan_type;
 396	u64 tsf;
 397	u32 rate_flags;
 398
 399	lockdep_assert_wiphy(sdata->local->hw.wiphy);
 400
 401	if (beacon_int < 10)
 402		beacon_int = 10;
 403
 404	switch (sdata->u.ibss.chandef.width) {
 405	case NL80211_CHAN_WIDTH_20_NOHT:
 406	case NL80211_CHAN_WIDTH_20:
 407	case NL80211_CHAN_WIDTH_40:
 408		chan_type = cfg80211_get_chandef_type(&sdata->u.ibss.chandef);
 409		cfg80211_chandef_create(&chandef, cbss->channel, chan_type);
 410		break;
 411	case NL80211_CHAN_WIDTH_5:
 412	case NL80211_CHAN_WIDTH_10:
 413		cfg80211_chandef_create(&chandef, cbss->channel,
 414					NL80211_CHAN_NO_HT);
 415		chandef.width = sdata->u.ibss.chandef.width;
 416		break;
 417	case NL80211_CHAN_WIDTH_80:
 418	case NL80211_CHAN_WIDTH_80P80:
 419	case NL80211_CHAN_WIDTH_160:
 420		chandef = sdata->u.ibss.chandef;
 421		chandef.chan = cbss->channel;
 422		break;
 423	default:
 424		/* fall back to 20 MHz for unsupported modes */
 425		cfg80211_chandef_create(&chandef, cbss->channel,
 426					NL80211_CHAN_NO_HT);
 427		break;
 428	}
 429
 430	sband = sdata->local->hw.wiphy->bands[cbss->channel->band];
 431	rate_flags = ieee80211_chandef_rate_flags(&sdata->u.ibss.chandef);
 432
 433	basic_rates = 0;
 434
 435	for (i = 0; i < bss->supp_rates_len; i++) {
 436		int rate = bss->supp_rates[i] & 0x7f;
 437		bool is_basic = !!(bss->supp_rates[i] & 0x80);
 438
 439		for (j = 0; j < sband->n_bitrates; j++) {
 440			int brate;
 441			if ((rate_flags & sband->bitrates[j].flags)
 442			    != rate_flags)
 443				continue;
 444
 445			brate = DIV_ROUND_UP(sband->bitrates[j].bitrate, 5);
 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
 467int ieee80211_ibss_csa_beacon(struct ieee80211_sub_if_data *sdata,
 468			      struct cfg80211_csa_settings *csa_settings,
 469			      u64 *changed)
 470{
 471	struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 472	struct beacon_data *presp, *old_presp;
 473	struct cfg80211_bss *cbss;
 474	const struct cfg80211_bss_ies *ies;
 475	u16 capability = WLAN_CAPABILITY_IBSS;
 476	u64 tsf;
 477
 478	lockdep_assert_wiphy(sdata->local->hw.wiphy);
 479
 480	if (ifibss->privacy)
 481		capability |= WLAN_CAPABILITY_PRIVACY;
 482
 483	cbss = cfg80211_get_bss(sdata->local->hw.wiphy, ifibss->chandef.chan,
 484				ifibss->bssid, ifibss->ssid,
 485				ifibss->ssid_len, IEEE80211_BSS_TYPE_IBSS,
 486				IEEE80211_PRIVACY(ifibss->privacy));
 487
 488	if (unlikely(!cbss))
 489		return -EINVAL;
 490
 491	rcu_read_lock();
 492	ies = rcu_dereference(cbss->ies);
 493	tsf = ies->tsf;
 494	rcu_read_unlock();
 495	cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
 496
 497	old_presp = sdata_dereference(ifibss->presp, sdata);
 498
 499	presp = ieee80211_ibss_build_presp(sdata,
 500					   sdata->vif.bss_conf.beacon_int,
 501					   sdata->vif.bss_conf.basic_rates,
 502					   capability, tsf, &ifibss->chandef,
 503					   NULL, csa_settings);
 504	if (!presp)
 505		return -ENOMEM;
 506
 507	rcu_assign_pointer(ifibss->presp, presp);
 508	if (old_presp)
 509		kfree_rcu(old_presp, rcu_head);
 510
 511	*changed |= BSS_CHANGED_BEACON;
 512	return 0;
 513}
 514
 515int ieee80211_ibss_finish_csa(struct ieee80211_sub_if_data *sdata, u64 *changed)
 516{
 517	struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 518	struct cfg80211_bss *cbss;
 519
 520	lockdep_assert_wiphy(sdata->local->hw.wiphy);
 521
 522	/* When not connected/joined, sending CSA doesn't make sense. */
 523	if (ifibss->state != IEEE80211_IBSS_MLME_JOINED)
 524		return -ENOLINK;
 525
 526	/* update cfg80211 bss information with the new channel */
 527	if (!is_zero_ether_addr(ifibss->bssid)) {
 528		cbss = cfg80211_get_bss(sdata->local->hw.wiphy,
 529					ifibss->chandef.chan,
 530					ifibss->bssid, ifibss->ssid,
 531					ifibss->ssid_len,
 532					IEEE80211_BSS_TYPE_IBSS,
 533					IEEE80211_PRIVACY(ifibss->privacy));
 534		/* XXX: should not really modify cfg80211 data */
 535		if (cbss) {
 536			cbss->channel = sdata->deflink.csa_chanreq.oper.chan;
 537			cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
 538		}
 539	}
 540
 541	ifibss->chandef = sdata->deflink.csa_chanreq.oper;
 542
 543	/* generate the beacon */
 544	return ieee80211_ibss_csa_beacon(sdata, NULL, changed);
 545}
 546
 547void ieee80211_ibss_stop(struct ieee80211_sub_if_data *sdata)
 548{
 549	struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 550
 551	wiphy_work_cancel(sdata->local->hw.wiphy,
 552			  &ifibss->csa_connection_drop_work);
 553}
 554
 555static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta)
 556	__acquires(RCU)
 557{
 558	struct ieee80211_sub_if_data *sdata = sta->sdata;
 559	u8 addr[ETH_ALEN];
 560
 561	memcpy(addr, sta->sta.addr, ETH_ALEN);
 562
 563	ibss_dbg(sdata, "Adding new IBSS station %pM\n", addr);
 564
 565	sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
 566	sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
 567	/* authorize the station only if the network is not RSN protected. If
 568	 * not wait for the userspace to authorize it */
 569	if (!sta->sdata->u.ibss.control_port)
 570		sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
 571
 572	rate_control_rate_init(sta);
 573
 574	/* If it fails, maybe we raced another insertion? */
 575	if (sta_info_insert_rcu(sta))
 576		return sta_info_get(sdata, addr);
 577	return sta;
 578}
 579
 580static struct sta_info *
 581ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, const u8 *bssid,
 582		       const u8 *addr, u32 supp_rates)
 583	__acquires(RCU)
 584{
 585	struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 586	struct ieee80211_local *local = sdata->local;
 587	struct sta_info *sta;
 588	struct ieee80211_chanctx_conf *chanctx_conf;
 589	struct ieee80211_supported_band *sband;
 590	int band;
 591
 592	/*
 593	 * XXX: Consider removing the least recently used entry and
 594	 * 	allow new one to be added.
 595	 */
 596	if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
 597		net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
 598				    sdata->name, addr);
 599		rcu_read_lock();
 600		return NULL;
 601	}
 602
 603	if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) {
 604		rcu_read_lock();
 605		return NULL;
 606	}
 607
 608	if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) {
 609		rcu_read_lock();
 610		return NULL;
 611	}
 612
 613	rcu_read_lock();
 614	chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
 615	if (WARN_ON_ONCE(!chanctx_conf))
 616		return NULL;
 617	band = chanctx_conf->def.chan->band;
 618	rcu_read_unlock();
 619
 620	sta = sta_info_alloc(sdata, addr, GFP_KERNEL);
 621	if (!sta) {
 622		rcu_read_lock();
 623		return NULL;
 624	}
 625
 626	/* make sure mandatory rates are always added */
 627	sband = local->hw.wiphy->bands[band];
 628	sta->sta.deflink.supp_rates[band] = supp_rates |
 629			ieee80211_mandatory_rates(sband);
 630
 631	return ieee80211_ibss_finish_sta(sta);
 632}
 633
 634static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
 635{
 636	struct ieee80211_local *local = sdata->local;
 637	int active = 0;
 638	struct sta_info *sta;
 639
 640	lockdep_assert_wiphy(sdata->local->hw.wiphy);
 641
 642	rcu_read_lock();
 643
 644	list_for_each_entry_rcu(sta, &local->sta_list, list) {
 645		unsigned long last_active = ieee80211_sta_last_active(sta);
 646
 647		if (sta->sdata == sdata &&
 648		    time_is_after_jiffies(last_active +
 649					  IEEE80211_IBSS_MERGE_INTERVAL)) {
 650			active++;
 651			break;
 652		}
 653	}
 654
 655	rcu_read_unlock();
 656
 657	return active;
 658}
 659
 660static void ieee80211_ibss_disconnect(struct ieee80211_sub_if_data *sdata)
 661{
 662	struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 663	struct ieee80211_local *local = sdata->local;
 664	struct cfg80211_bss *cbss;
 665	struct beacon_data *presp;
 666	struct sta_info *sta;
 667
 668	lockdep_assert_wiphy(local->hw.wiphy);
 669
 670	if (!is_zero_ether_addr(ifibss->bssid)) {
 671		cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->chandef.chan,
 672					ifibss->bssid, ifibss->ssid,
 673					ifibss->ssid_len,
 674					IEEE80211_BSS_TYPE_IBSS,
 675					IEEE80211_PRIVACY(ifibss->privacy));
 676
 677		if (cbss) {
 678			cfg80211_unlink_bss(local->hw.wiphy, cbss);
 679			cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
 680		}
 681	}
 682
 683	ifibss->state = IEEE80211_IBSS_MLME_SEARCH;
 684
 685	sta_info_flush(sdata, -1);
 686
 687	spin_lock_bh(&ifibss->incomplete_lock);
 688	while (!list_empty(&ifibss->incomplete_stations)) {
 689		sta = list_first_entry(&ifibss->incomplete_stations,
 690				       struct sta_info, list);
 691		list_del(&sta->list);
 692		spin_unlock_bh(&ifibss->incomplete_lock);
 693
 694		sta_info_free(local, sta);
 695		spin_lock_bh(&ifibss->incomplete_lock);
 696	}
 697	spin_unlock_bh(&ifibss->incomplete_lock);
 698
 699	netif_carrier_off(sdata->dev);
 700
 701	sdata->vif.cfg.ibss_joined = false;
 702	sdata->vif.cfg.ibss_creator = false;
 703	sdata->vif.bss_conf.enable_beacon = false;
 704	sdata->vif.cfg.ssid_len = 0;
 705
 706	/* remove beacon */
 707	presp = sdata_dereference(ifibss->presp, sdata);
 708	RCU_INIT_POINTER(sdata->u.ibss.presp, NULL);
 709	if (presp)
 710		kfree_rcu(presp, rcu_head);
 711
 712	clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state);
 713	ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED |
 714						BSS_CHANGED_IBSS);
 715	drv_leave_ibss(local, sdata);
 716	ieee80211_link_release_channel(&sdata->deflink);
 717}
 718
 719static void ieee80211_csa_connection_drop_work(struct wiphy *wiphy,
 720					       struct wiphy_work *work)
 721{
 722	struct ieee80211_sub_if_data *sdata =
 723		container_of(work, struct ieee80211_sub_if_data,
 724			     u.ibss.csa_connection_drop_work);
 725
 726	ieee80211_ibss_disconnect(sdata);
 727	synchronize_rcu();
 728	skb_queue_purge(&sdata->skb_queue);
 729
 730	/* trigger a scan to find another IBSS network to join */
 731	wiphy_work_queue(sdata->local->hw.wiphy, &sdata->work);
 732}
 733
 734static void ieee80211_ibss_csa_mark_radar(struct ieee80211_sub_if_data *sdata)
 735{
 736	struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 737	int err;
 738
 739	/* if the current channel is a DFS channel, mark the channel as
 740	 * unavailable.
 741	 */
 742	err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
 743					    &ifibss->chandef,
 744					    NL80211_IFTYPE_ADHOC);
 745	if (err > 0)
 746		cfg80211_radar_event(sdata->local->hw.wiphy, &ifibss->chandef,
 747				     GFP_ATOMIC);
 748}
 749
 750static bool
 751ieee80211_ibss_process_chanswitch(struct ieee80211_sub_if_data *sdata,
 752				  struct ieee802_11_elems *elems,
 753				  bool beacon)
 754{
 755	struct cfg80211_csa_settings params;
 756	struct ieee80211_csa_ie csa_ie;
 757	struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 758	enum nl80211_channel_type ch_type;
 759	int err;
 760	struct ieee80211_conn_settings conn = {
 761		.mode = IEEE80211_CONN_MODE_HT,
 762		.bw_limit = IEEE80211_CONN_BW_LIMIT_40,
 763	};
 764	u32 vht_cap_info = 0;
 765
 766	lockdep_assert_wiphy(sdata->local->hw.wiphy);
 767
 
 
 768	switch (ifibss->chandef.width) {
 769	case NL80211_CHAN_WIDTH_5:
 770	case NL80211_CHAN_WIDTH_10:
 771	case NL80211_CHAN_WIDTH_20_NOHT:
 772		conn.mode = IEEE80211_CONN_MODE_LEGACY;
 773		fallthrough;
 774	case NL80211_CHAN_WIDTH_20:
 775		conn.bw_limit = IEEE80211_CONN_BW_LIMIT_20;
 776		break;
 777	default:
 778		break;
 779	}
 780
 781	if (elems->vht_cap_elem)
 782		vht_cap_info = le32_to_cpu(elems->vht_cap_elem->vht_cap_info);
 783
 784	memset(&params, 0, sizeof(params));
 785	err = ieee80211_parse_ch_switch_ie(sdata, elems,
 786					   ifibss->chandef.chan->band,
 787					   vht_cap_info, &conn,
 788					   ifibss->bssid, &csa_ie);
 789	/* can't switch to destination channel, fail */
 790	if (err < 0)
 791		goto disconnect;
 792
 793	/* did not contain a CSA */
 794	if (err)
 795		return false;
 796
 797	/* channel switch is not supported, disconnect */
 798	if (!(sdata->local->hw.wiphy->flags & WIPHY_FLAG_HAS_CHANNEL_SWITCH))
 799		goto disconnect;
 800
 801	params.count = csa_ie.count;
 802	params.chandef = csa_ie.chanreq.oper;
 803
 804	switch (ifibss->chandef.width) {
 805	case NL80211_CHAN_WIDTH_20_NOHT:
 806	case NL80211_CHAN_WIDTH_20:
 807	case NL80211_CHAN_WIDTH_40:
 808		/* keep our current HT mode (HT20/HT40+/HT40-), even if
 809		 * another mode  has been announced. The mode is not adopted
 810		 * within the beacon while doing CSA and we should therefore
 811		 * keep the mode which we announce.
 812		 */
 813		ch_type = cfg80211_get_chandef_type(&ifibss->chandef);
 814		cfg80211_chandef_create(&params.chandef, params.chandef.chan,
 815					ch_type);
 816		break;
 817	case NL80211_CHAN_WIDTH_5:
 818	case NL80211_CHAN_WIDTH_10:
 819		if (params.chandef.width != ifibss->chandef.width) {
 820			sdata_info(sdata,
 821				   "IBSS %pM received channel switch from incompatible channel width (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
 822				   ifibss->bssid,
 823				   params.chandef.chan->center_freq,
 824				   params.chandef.width,
 825				   params.chandef.center_freq1,
 826				   params.chandef.center_freq2);
 827			goto disconnect;
 828		}
 829		break;
 830	default:
 831		/* should not happen, conn_flags should prevent VHT modes. */
 832		WARN_ON(1);
 833		goto disconnect;
 834	}
 835
 836	if (!cfg80211_reg_can_beacon(sdata->local->hw.wiphy, &params.chandef,
 837				     NL80211_IFTYPE_ADHOC)) {
 838		sdata_info(sdata,
 839			   "IBSS %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
 840			   ifibss->bssid,
 841			   params.chandef.chan->center_freq,
 842			   params.chandef.width,
 843			   params.chandef.center_freq1,
 844			   params.chandef.center_freq2);
 845		goto disconnect;
 846	}
 847
 848	err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
 849					    &params.chandef,
 850					    NL80211_IFTYPE_ADHOC);
 851	if (err < 0)
 852		goto disconnect;
 853	if (err > 0 && !ifibss->userspace_handles_dfs) {
 854		/* IBSS-DFS only allowed with a control program */
 855		goto disconnect;
 856	}
 857
 858	params.radar_required = err;
 859
 860	if (cfg80211_chandef_identical(&params.chandef,
 861				       &sdata->vif.bss_conf.chanreq.oper)) {
 862		ibss_dbg(sdata,
 863			 "received csa with an identical chandef, ignoring\n");
 864		return true;
 865	}
 866
 867	/* all checks done, now perform the channel switch. */
 868	ibss_dbg(sdata,
 869		 "received channel switch announcement to go to channel %d MHz\n",
 870		 params.chandef.chan->center_freq);
 871
 872	params.block_tx = !!csa_ie.mode;
 873
 874	if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev,
 875				     &params))
 876		goto disconnect;
 877
 878	ieee80211_ibss_csa_mark_radar(sdata);
 879
 880	return true;
 881disconnect:
 882	ibss_dbg(sdata, "Can't handle channel switch, disconnect\n");
 883	wiphy_work_queue(sdata->local->hw.wiphy,
 884			 &ifibss->csa_connection_drop_work);
 885
 886	ieee80211_ibss_csa_mark_radar(sdata);
 887
 888	return true;
 889}
 890
 891static void
 892ieee80211_rx_mgmt_spectrum_mgmt(struct ieee80211_sub_if_data *sdata,
 893				struct ieee80211_mgmt *mgmt, size_t len,
 894				struct ieee80211_rx_status *rx_status,
 895				struct ieee802_11_elems *elems)
 896{
 897	int required_len;
 898
 899	if (len < IEEE80211_MIN_ACTION_SIZE + 1)
 900		return;
 901
 902	/* CSA is the only action we handle for now */
 903	if (mgmt->u.action.u.measurement.action_code !=
 904	    WLAN_ACTION_SPCT_CHL_SWITCH)
 905		return;
 906
 907	required_len = IEEE80211_MIN_ACTION_SIZE +
 908		       sizeof(mgmt->u.action.u.chan_switch);
 909	if (len < required_len)
 910		return;
 911
 912	if (!sdata->vif.bss_conf.csa_active)
 913		ieee80211_ibss_process_chanswitch(sdata, elems, false);
 914}
 915
 916static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data *sdata,
 917					  struct ieee80211_mgmt *mgmt,
 918					  size_t len)
 919{
 920	u16 reason = le16_to_cpu(mgmt->u.deauth.reason_code);
 921
 922	if (len < IEEE80211_DEAUTH_FRAME_LEN)
 923		return;
 924
 925	ibss_dbg(sdata, "RX DeAuth SA=%pM DA=%pM\n", mgmt->sa, mgmt->da);
 926	ibss_dbg(sdata, "\tBSSID=%pM (reason: %d)\n", mgmt->bssid, reason);
 927	sta_info_destroy_addr(sdata, mgmt->sa);
 928}
 929
 930static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata,
 931					struct ieee80211_mgmt *mgmt,
 932					size_t len)
 933{
 934	u16 auth_alg, auth_transaction;
 935
 936	lockdep_assert_wiphy(sdata->local->hw.wiphy);
 937
 938	if (len < 24 + 6)
 939		return;
 940
 941	auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
 942	auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
 943
 944	ibss_dbg(sdata, "RX Auth SA=%pM DA=%pM\n", mgmt->sa, mgmt->da);
 945	ibss_dbg(sdata, "\tBSSID=%pM (auth_transaction=%d)\n",
 946		 mgmt->bssid, auth_transaction);
 947
 948	if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
 949		return;
 950
 951	/*
 952	 * IEEE 802.11 standard does not require authentication in IBSS
 953	 * networks and most implementations do not seem to use it.
 954	 * However, try to reply to authentication attempts if someone
 955	 * has actually implemented this.
 956	 */
 957	ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, 0, NULL, 0,
 958			    mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0, 0);
 959}
 960
 961static void ieee80211_update_sta_info(struct ieee80211_sub_if_data *sdata,
 962				      struct ieee80211_mgmt *mgmt, size_t len,
 963				      struct ieee80211_rx_status *rx_status,
 964				      struct ieee802_11_elems *elems,
 965				      struct ieee80211_channel *channel)
 966{
 967	struct sta_info *sta;
 968	enum nl80211_band band = rx_status->band;
 969	struct ieee80211_local *local = sdata->local;
 970	struct ieee80211_supported_band *sband;
 971	bool rates_updated = false;
 972	u32 supp_rates = 0;
 973
 974	if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
 975		return;
 976
 977	if (!ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid))
 978		return;
 979
 980	sband = local->hw.wiphy->bands[band];
 981	if (WARN_ON(!sband))
 982		return;
 983
 984	rcu_read_lock();
 985	sta = sta_info_get(sdata, mgmt->sa);
 986
 987	if (elems->supp_rates) {
 988		supp_rates = ieee80211_sta_get_rates(sdata, elems,
 989						     band, NULL);
 990		if (sta) {
 991			u32 prev_rates;
 992
 993			prev_rates = sta->sta.deflink.supp_rates[band];
 994
 995			sta->sta.deflink.supp_rates[band] = supp_rates |
 996				ieee80211_mandatory_rates(sband);
 997			if (sta->sta.deflink.supp_rates[band] != prev_rates) {
 998				ibss_dbg(sdata,
 999					 "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n",
1000					 sta->sta.addr, prev_rates,
1001					 sta->sta.deflink.supp_rates[band]);
1002				rates_updated = true;
1003			}
1004		} else {
1005			rcu_read_unlock();
1006			sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid,
1007						     mgmt->sa, supp_rates);
1008		}
1009	}
1010
1011	if (sta && !sta->sta.wme &&
1012	    (elems->wmm_info || elems->s1g_capab) &&
1013	    local->hw.queues >= IEEE80211_NUM_ACS) {
1014		sta->sta.wme = true;
1015		ieee80211_check_fast_xmit(sta);
1016	}
1017
1018	if (sta && elems->ht_operation && elems->ht_cap_elem &&
1019	    sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20_NOHT &&
1020	    sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_5 &&
1021	    sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_10) {
1022		/* we both use HT */
1023		struct ieee80211_ht_cap htcap_ie;
1024		struct cfg80211_chan_def chandef;
1025		enum ieee80211_sta_rx_bandwidth bw = sta->sta.deflink.bandwidth;
1026
1027		cfg80211_chandef_create(&chandef, channel, NL80211_CHAN_NO_HT);
1028		ieee80211_chandef_ht_oper(elems->ht_operation, &chandef);
1029
1030		memcpy(&htcap_ie, elems->ht_cap_elem, sizeof(htcap_ie));
1031		rates_updated |= ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
1032								   &htcap_ie,
1033								   &sta->deflink);
1034
1035		if (elems->vht_operation && elems->vht_cap_elem &&
1036		    sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20 &&
1037		    sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_40) {
1038			/* we both use VHT */
1039			struct ieee80211_vht_cap cap_ie;
1040			struct ieee80211_sta_vht_cap cap = sta->sta.deflink.vht_cap;
1041			u32 vht_cap_info =
1042				le32_to_cpu(elems->vht_cap_elem->vht_cap_info);
1043
1044			ieee80211_chandef_vht_oper(&local->hw, vht_cap_info,
1045						   elems->vht_operation,
1046						   elems->ht_operation,
1047						   &chandef);
1048			memcpy(&cap_ie, elems->vht_cap_elem, sizeof(cap_ie));
1049			ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
1050							    &cap_ie, NULL,
1051							    &sta->deflink);
1052			if (memcmp(&cap, &sta->sta.deflink.vht_cap, sizeof(cap)))
1053				rates_updated |= true;
1054		}
1055
1056		if (bw != sta->sta.deflink.bandwidth)
1057			rates_updated |= true;
1058
1059		if (!cfg80211_chandef_compatible(&sdata->u.ibss.chandef,
1060						 &chandef))
1061			WARN_ON_ONCE(1);
1062	}
1063
1064	if (sta && rates_updated) {
1065		u32 changed = IEEE80211_RC_SUPP_RATES_CHANGED;
1066		u8 rx_nss = sta->sta.deflink.rx_nss;
1067
1068		/* Force rx_nss recalculation */
1069		sta->sta.deflink.rx_nss = 0;
1070		rate_control_rate_init(sta);
1071		if (sta->sta.deflink.rx_nss != rx_nss)
1072			changed |= IEEE80211_RC_NSS_CHANGED;
1073
1074		drv_sta_rc_update(local, sdata, &sta->sta, changed);
1075	}
1076
1077	rcu_read_unlock();
1078}
1079
1080static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1081				  struct ieee80211_mgmt *mgmt, size_t len,
1082				  struct ieee80211_rx_status *rx_status,
1083				  struct ieee802_11_elems *elems)
1084{
1085	struct ieee80211_local *local = sdata->local;
1086	struct cfg80211_bss *cbss;
1087	struct ieee80211_bss *bss;
1088	struct ieee80211_channel *channel;
1089	u64 beacon_timestamp, rx_timestamp;
1090	u32 supp_rates = 0;
1091	enum nl80211_band band = rx_status->band;
1092
1093	channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
1094	if (!channel)
1095		return;
1096
1097	ieee80211_update_sta_info(sdata, mgmt, len, rx_status, elems, channel);
1098
1099	bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, channel);
1100	if (!bss)
1101		return;
1102
1103	cbss = container_of((void *)bss, struct cfg80211_bss, priv);
1104
1105	/* same for beacon and probe response */
1106	beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp);
1107
1108	/* check if we need to merge IBSS */
1109
1110	/* not an IBSS */
1111	if (!(cbss->capability & WLAN_CAPABILITY_IBSS))
1112		goto put_bss;
1113
1114	/* different channel */
1115	if (sdata->u.ibss.fixed_channel &&
1116	    sdata->u.ibss.chandef.chan != cbss->channel)
1117		goto put_bss;
1118
1119	/* different SSID */
1120	if (elems->ssid_len != sdata->u.ibss.ssid_len ||
1121	    memcmp(elems->ssid, sdata->u.ibss.ssid,
1122				sdata->u.ibss.ssid_len))
1123		goto put_bss;
1124
1125	/* process channel switch */
1126	if (sdata->vif.bss_conf.csa_active ||
1127	    ieee80211_ibss_process_chanswitch(sdata, elems, true))
1128		goto put_bss;
1129
1130	/* same BSSID */
1131	if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid))
1132		goto put_bss;
1133
1134	/* we use a fixed BSSID */
1135	if (sdata->u.ibss.fixed_bssid)
1136		goto put_bss;
1137
1138	if (ieee80211_have_rx_timestamp(rx_status)) {
1139		/* time when timestamp field was received */
1140		rx_timestamp =
1141			ieee80211_calculate_rx_timestamp(local, rx_status,
1142							 len + FCS_LEN, 24);
1143	} else {
1144		/*
1145		 * second best option: get current TSF
1146		 * (will return -1 if not supported)
1147		 */
1148		rx_timestamp = drv_get_tsf(local, sdata);
1149	}
1150
1151	ibss_dbg(sdata, "RX beacon SA=%pM BSSID=%pM TSF=0x%llx\n",
1152		 mgmt->sa, mgmt->bssid,
1153		 (unsigned long long)rx_timestamp);
1154	ibss_dbg(sdata, "\tBCN=0x%llx diff=%lld @%lu\n",
1155		 (unsigned long long)beacon_timestamp,
1156		 (unsigned long long)(rx_timestamp - beacon_timestamp),
1157		 jiffies);
1158
1159	if (beacon_timestamp > rx_timestamp) {
1160		ibss_dbg(sdata,
1161			 "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n",
1162			 mgmt->bssid);
1163		ieee80211_sta_join_ibss(sdata, bss);
1164		supp_rates = ieee80211_sta_get_rates(sdata, elems, band, NULL);
1165		ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa,
1166				       supp_rates);
1167		rcu_read_unlock();
1168	}
1169
1170 put_bss:
1171	ieee80211_rx_bss_put(local, bss);
1172}
1173
1174void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata,
1175			      const u8 *bssid, const u8 *addr,
1176			      u32 supp_rates)
1177{
1178	struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1179	struct ieee80211_local *local = sdata->local;
1180	struct sta_info *sta;
1181	struct ieee80211_chanctx_conf *chanctx_conf;
1182	struct ieee80211_supported_band *sband;
1183	int band;
1184
1185	/*
1186	 * XXX: Consider removing the least recently used entry and
1187	 * 	allow new one to be added.
1188	 */
1189	if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
1190		net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
1191				    sdata->name, addr);
1192		return;
1193	}
1194
1195	if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH)
1196		return;
1197
1198	if (!ether_addr_equal(bssid, sdata->u.ibss.bssid))
1199		return;
1200
1201	rcu_read_lock();
1202	chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
1203	if (WARN_ON_ONCE(!chanctx_conf)) {
1204		rcu_read_unlock();
1205		return;
1206	}
1207	band = chanctx_conf->def.chan->band;
1208	rcu_read_unlock();
1209
1210	sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
1211	if (!sta)
1212		return;
1213
1214	/* make sure mandatory rates are always added */
1215	sband = local->hw.wiphy->bands[band];
1216	sta->sta.deflink.supp_rates[band] = supp_rates |
1217			ieee80211_mandatory_rates(sband);
1218
1219	spin_lock(&ifibss->incomplete_lock);
1220	list_add(&sta->list, &ifibss->incomplete_stations);
1221	spin_unlock(&ifibss->incomplete_lock);
1222	wiphy_work_queue(local->hw.wiphy, &sdata->work);
1223}
1224
1225static void ieee80211_ibss_sta_expire(struct ieee80211_sub_if_data *sdata)
1226{
1227	struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1228	struct ieee80211_local *local = sdata->local;
1229	struct sta_info *sta, *tmp;
1230	unsigned long exp_time = IEEE80211_IBSS_INACTIVITY_LIMIT;
1231	unsigned long exp_rsn = IEEE80211_IBSS_RSN_INACTIVITY_LIMIT;
1232
1233	lockdep_assert_wiphy(local->hw.wiphy);
1234
1235	list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
1236		unsigned long last_active = ieee80211_sta_last_active(sta);
1237
1238		if (sdata != sta->sdata)
1239			continue;
1240
1241		if (time_is_before_jiffies(last_active + exp_time) ||
1242		    (time_is_before_jiffies(last_active + exp_rsn) &&
1243		     sta->sta_state != IEEE80211_STA_AUTHORIZED)) {
1244			u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
1245
1246			sta_dbg(sta->sdata, "expiring inactive %sSTA %pM\n",
1247				sta->sta_state != IEEE80211_STA_AUTHORIZED ?
1248				"not authorized " : "", sta->sta.addr);
1249
1250			ieee80211_send_deauth_disassoc(sdata, sta->sta.addr,
1251						       ifibss->bssid,
1252						       IEEE80211_STYPE_DEAUTH,
1253						       WLAN_REASON_DEAUTH_LEAVING,
1254						       true, frame_buf);
1255			WARN_ON(__sta_info_destroy(sta));
1256		}
1257	}
1258}
1259
1260/*
1261 * This function is called with state == IEEE80211_IBSS_MLME_JOINED
1262 */
1263
1264static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
1265{
1266	struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1267
1268	lockdep_assert_wiphy(sdata->local->hw.wiphy);
1269
1270	mod_timer(&ifibss->timer,
1271		  round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
1272
1273	ieee80211_ibss_sta_expire(sdata);
1274
1275	if (time_before(jiffies, ifibss->last_scan_completed +
1276		       IEEE80211_IBSS_MERGE_INTERVAL))
1277		return;
1278
1279	if (ieee80211_sta_active_ibss(sdata))
1280		return;
1281
1282	if (ifibss->fixed_channel)
1283		return;
1284
1285	sdata_info(sdata,
1286		   "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n");
1287
1288	ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len,
1289				    NULL, 0);
1290}
1291
1292static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
1293{
1294	struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1295	u8 bssid[ETH_ALEN];
1296	u16 capability;
1297	int i;
1298
1299	lockdep_assert_wiphy(sdata->local->hw.wiphy);
1300
1301	if (ifibss->fixed_bssid) {
1302		memcpy(bssid, ifibss->bssid, ETH_ALEN);
1303	} else {
1304		/* Generate random, not broadcast, locally administered BSSID. Mix in
1305		 * own MAC address to make sure that devices that do not have proper
1306		 * random number generator get different BSSID. */
1307		get_random_bytes(bssid, ETH_ALEN);
1308		for (i = 0; i < ETH_ALEN; i++)
1309			bssid[i] ^= sdata->vif.addr[i];
1310		bssid[0] &= ~0x01;
1311		bssid[0] |= 0x02;
1312	}
1313
1314	sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid);
1315
1316	capability = WLAN_CAPABILITY_IBSS;
1317
1318	if (ifibss->privacy)
1319		capability |= WLAN_CAPABILITY_PRIVACY;
1320
1321	__ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int,
1322				  &ifibss->chandef, ifibss->basic_rates,
1323				  capability, 0, true);
1324}
1325
1326static unsigned int ibss_setup_channels(struct wiphy *wiphy,
1327					struct ieee80211_channel **channels,
1328					unsigned int channels_max,
1329					u32 center_freq, u32 width)
1330{
1331	struct ieee80211_channel *chan = NULL;
1332	unsigned int n_chan = 0;
1333	u32 start_freq, end_freq, freq;
1334
1335	if (width <= 20) {
1336		start_freq = center_freq;
1337		end_freq = center_freq;
1338	} else {
1339		start_freq = center_freq - width / 2 + 10;
1340		end_freq = center_freq + width / 2 - 10;
1341	}
1342
1343	for (freq = start_freq; freq <= end_freq; freq += 20) {
1344		chan = ieee80211_get_channel(wiphy, freq);
1345		if (!chan)
1346			continue;
1347		if (n_chan >= channels_max)
1348			return n_chan;
1349
1350		channels[n_chan] = chan;
1351		n_chan++;
1352	}
1353
1354	return n_chan;
1355}
1356
1357static unsigned int
1358ieee80211_ibss_setup_scan_channels(struct wiphy *wiphy,
1359				   const struct cfg80211_chan_def *chandef,
1360				   struct ieee80211_channel **channels,
1361				   unsigned int channels_max)
1362{
1363	unsigned int n_chan = 0;
1364	u32 width, cf1, cf2 = 0;
1365
1366	switch (chandef->width) {
1367	case NL80211_CHAN_WIDTH_40:
1368		width = 40;
1369		break;
1370	case NL80211_CHAN_WIDTH_80P80:
1371		cf2 = chandef->center_freq2;
1372		fallthrough;
1373	case NL80211_CHAN_WIDTH_80:
1374		width = 80;
1375		break;
1376	case NL80211_CHAN_WIDTH_160:
1377		width = 160;
1378		break;
1379	default:
1380		width = 20;
1381		break;
1382	}
1383
1384	cf1 = chandef->center_freq1;
1385
1386	n_chan = ibss_setup_channels(wiphy, channels, channels_max, cf1, width);
1387
1388	if (cf2)
1389		n_chan += ibss_setup_channels(wiphy, &channels[n_chan],
1390					      channels_max - n_chan, cf2,
1391					      width);
1392
1393	return n_chan;
1394}
1395
1396/*
1397 * This function is called with state == IEEE80211_IBSS_MLME_SEARCH
1398 */
1399
1400static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
1401{
1402	struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1403	struct ieee80211_local *local = sdata->local;
1404	struct cfg80211_bss *cbss;
1405	struct ieee80211_channel *chan = NULL;
1406	const u8 *bssid = NULL;
1407	int active_ibss;
1408
1409	lockdep_assert_wiphy(sdata->local->hw.wiphy);
1410
1411	active_ibss = ieee80211_sta_active_ibss(sdata);
1412	ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss);
1413
1414	if (active_ibss)
1415		return;
1416
1417	if (ifibss->fixed_bssid)
1418		bssid = ifibss->bssid;
1419	if (ifibss->fixed_channel)
1420		chan = ifibss->chandef.chan;
1421	if (!is_zero_ether_addr(ifibss->bssid))
1422		bssid = ifibss->bssid;
1423	cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid,
1424				ifibss->ssid, ifibss->ssid_len,
1425				IEEE80211_BSS_TYPE_IBSS,
1426				IEEE80211_PRIVACY(ifibss->privacy));
1427
1428	if (cbss) {
1429		struct ieee80211_bss *bss;
1430
1431		bss = (void *)cbss->priv;
1432		ibss_dbg(sdata,
1433			 "sta_find_ibss: selected %pM current %pM\n",
1434			 cbss->bssid, ifibss->bssid);
1435		sdata_info(sdata,
1436			   "Selected IBSS BSSID %pM based on configured SSID\n",
1437			   cbss->bssid);
1438
1439		ieee80211_sta_join_ibss(sdata, bss);
1440		ieee80211_rx_bss_put(local, bss);
1441		return;
1442	}
1443
1444	/* if a fixed bssid and a fixed freq have been provided create the IBSS
1445	 * directly and do not waste time scanning
1446	 */
1447	if (ifibss->fixed_bssid && ifibss->fixed_channel) {
1448		sdata_info(sdata, "Created IBSS using preconfigured BSSID %pM\n",
1449			   bssid);
1450		ieee80211_sta_create_ibss(sdata);
1451		return;
1452	}
1453
1454
1455	ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n");
1456
1457	/* Selected IBSS not found in current scan results - try to scan */
1458	if (time_after(jiffies, ifibss->last_scan_completed +
1459					IEEE80211_SCAN_INTERVAL)) {
1460		struct ieee80211_channel *channels[8];
1461		unsigned int num;
1462
1463		sdata_info(sdata, "Trigger new scan to find an IBSS to join\n");
1464
1465		if (ifibss->fixed_channel) {
1466			num = ieee80211_ibss_setup_scan_channels(local->hw.wiphy,
1467								 &ifibss->chandef,
1468								 channels,
1469								 ARRAY_SIZE(channels));
1470			ieee80211_request_ibss_scan(sdata, ifibss->ssid,
1471						    ifibss->ssid_len, channels,
1472						    num);
1473		} else {
1474			ieee80211_request_ibss_scan(sdata, ifibss->ssid,
1475						    ifibss->ssid_len, NULL, 0);
1476		}
1477	} else {
1478		int interval = IEEE80211_SCAN_INTERVAL;
1479
1480		if (time_after(jiffies, ifibss->ibss_join_req +
1481			       IEEE80211_IBSS_JOIN_TIMEOUT))
1482			ieee80211_sta_create_ibss(sdata);
1483
1484		mod_timer(&ifibss->timer,
1485			  round_jiffies(jiffies + interval));
1486	}
1487}
1488
1489static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
1490					struct sk_buff *req)
1491{
1492	struct ieee80211_mgmt *mgmt = (void *)req->data;
1493	struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1494	struct ieee80211_local *local = sdata->local;
1495	int tx_last_beacon, len = req->len;
1496	struct sk_buff *skb;
1497	struct beacon_data *presp;
1498	u8 *pos, *end;
1499
1500	lockdep_assert_wiphy(sdata->local->hw.wiphy);
1501
1502	presp = sdata_dereference(ifibss->presp, sdata);
1503
1504	if (ifibss->state != IEEE80211_IBSS_MLME_JOINED ||
1505	    len < 24 + 2 || !presp)
1506		return;
1507
1508	tx_last_beacon = drv_tx_last_beacon(local);
1509
1510	ibss_dbg(sdata, "RX ProbeReq SA=%pM DA=%pM\n", mgmt->sa, mgmt->da);
1511	ibss_dbg(sdata, "\tBSSID=%pM (tx_last_beacon=%d)\n",
1512		 mgmt->bssid, tx_last_beacon);
1513
1514	if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da))
1515		return;
1516
1517	if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) &&
1518	    !is_broadcast_ether_addr(mgmt->bssid))
1519		return;
1520
1521	end = ((u8 *) mgmt) + len;
1522	pos = mgmt->u.probe_req.variable;
1523	if (pos[0] != WLAN_EID_SSID ||
1524	    pos + 2 + pos[1] > end) {
1525		ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n",
1526			 mgmt->sa);
1527		return;
1528	}
1529	if (pos[1] != 0 &&
1530	    (pos[1] != ifibss->ssid_len ||
1531	     memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) {
1532		/* Ignore ProbeReq for foreign SSID */
1533		return;
1534	}
1535
1536	/* Reply with ProbeResp */
1537	skb = dev_alloc_skb(local->tx_headroom + presp->head_len);
1538	if (!skb)
1539		return;
1540
1541	skb_reserve(skb, local->tx_headroom);
1542	skb_put_data(skb, presp->head, presp->head_len);
1543
1544	memcpy(((struct ieee80211_mgmt *) skb->data)->da, mgmt->sa, ETH_ALEN);
1545	ibss_dbg(sdata, "Sending ProbeResp to %pM\n", mgmt->sa);
1546	IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1547
1548	/* avoid excessive retries for probe request to wildcard SSIDs */
1549	if (pos[1] == 0)
1550		IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_NO_ACK;
1551
1552	ieee80211_tx_skb(sdata, skb);
1553}
1554
1555static
1556void ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data *sdata,
1557				    struct ieee80211_mgmt *mgmt, size_t len,
1558				    struct ieee80211_rx_status *rx_status)
1559{
1560	size_t baselen;
1561	struct ieee802_11_elems *elems;
1562
1563	BUILD_BUG_ON(offsetof(typeof(mgmt->u.probe_resp), variable) !=
1564		     offsetof(typeof(mgmt->u.beacon), variable));
1565
1566	/*
1567	 * either beacon or probe_resp but the variable field is at the
1568	 * same offset
1569	 */
1570	baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1571	if (baselen > len)
1572		return;
1573
1574	elems = ieee802_11_parse_elems(mgmt->u.probe_resp.variable,
1575				       len - baselen, false, NULL);
1576
1577	if (elems) {
1578		ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, elems);
1579		kfree(elems);
1580	}
1581}
1582
1583void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1584				   struct sk_buff *skb)
1585{
1586	struct ieee80211_rx_status *rx_status;
1587	struct ieee80211_mgmt *mgmt;
1588	u16 fc;
1589	struct ieee802_11_elems *elems;
1590	int ies_len;
1591
1592	rx_status = IEEE80211_SKB_RXCB(skb);
1593	mgmt = (struct ieee80211_mgmt *) skb->data;
1594	fc = le16_to_cpu(mgmt->frame_control);
1595
1596	if (!sdata->u.ibss.ssid_len)
1597		return; /* not ready to merge yet */
1598
1599	switch (fc & IEEE80211_FCTL_STYPE) {
1600	case IEEE80211_STYPE_PROBE_REQ:
1601		ieee80211_rx_mgmt_probe_req(sdata, skb);
1602		break;
1603	case IEEE80211_STYPE_PROBE_RESP:
1604	case IEEE80211_STYPE_BEACON:
1605		ieee80211_rx_mgmt_probe_beacon(sdata, mgmt, skb->len,
1606					       rx_status);
1607		break;
1608	case IEEE80211_STYPE_AUTH:
1609		ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len);
1610		break;
1611	case IEEE80211_STYPE_DEAUTH:
1612		ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len);
1613		break;
1614	case IEEE80211_STYPE_ACTION:
1615		switch (mgmt->u.action.category) {
1616		case WLAN_CATEGORY_SPECTRUM_MGMT:
1617			ies_len = skb->len -
1618				  offsetof(struct ieee80211_mgmt,
1619					   u.action.u.chan_switch.variable);
1620
1621			if (ies_len < 0)
1622				break;
1623
1624			elems = ieee802_11_parse_elems(
1625				mgmt->u.action.u.chan_switch.variable,
1626				ies_len, true, NULL);
1627
1628			if (elems && !elems->parse_error)
1629				ieee80211_rx_mgmt_spectrum_mgmt(sdata, mgmt,
1630								skb->len,
1631								rx_status,
1632								elems);
1633			kfree(elems);
1634			break;
1635		}
1636	}
1637}
1638
1639void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata)
1640{
1641	struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1642	struct sta_info *sta;
1643
1644	/*
1645	 * Work could be scheduled after scan or similar
1646	 * when we aren't even joined (or trying) with a
1647	 * network.
1648	 */
1649	if (!ifibss->ssid_len)
1650		return;
1651
1652	spin_lock_bh(&ifibss->incomplete_lock);
1653	while (!list_empty(&ifibss->incomplete_stations)) {
1654		sta = list_first_entry(&ifibss->incomplete_stations,
1655				       struct sta_info, list);
1656		list_del(&sta->list);
1657		spin_unlock_bh(&ifibss->incomplete_lock);
1658
1659		ieee80211_ibss_finish_sta(sta);
1660		rcu_read_unlock();
1661		spin_lock_bh(&ifibss->incomplete_lock);
1662	}
1663	spin_unlock_bh(&ifibss->incomplete_lock);
1664
1665	switch (ifibss->state) {
1666	case IEEE80211_IBSS_MLME_SEARCH:
1667		ieee80211_sta_find_ibss(sdata);
1668		break;
1669	case IEEE80211_IBSS_MLME_JOINED:
1670		ieee80211_sta_merge_ibss(sdata);
1671		break;
1672	default:
1673		WARN_ON(1);
1674		break;
1675	}
1676}
1677
1678static void ieee80211_ibss_timer(struct timer_list *t)
1679{
1680	struct ieee80211_sub_if_data *sdata =
1681		from_timer(sdata, t, u.ibss.timer);
1682
1683	wiphy_work_queue(sdata->local->hw.wiphy, &sdata->work);
1684}
1685
1686void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata)
1687{
1688	struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1689
1690	timer_setup(&ifibss->timer, ieee80211_ibss_timer, 0);
1691	INIT_LIST_HEAD(&ifibss->incomplete_stations);
1692	spin_lock_init(&ifibss->incomplete_lock);
1693	wiphy_work_init(&ifibss->csa_connection_drop_work,
1694			ieee80211_csa_connection_drop_work);
1695}
1696
1697/* scan finished notification */
1698void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local)
1699{
1700	struct ieee80211_sub_if_data *sdata;
1701
1702	lockdep_assert_wiphy(local->hw.wiphy);
1703
1704	list_for_each_entry(sdata, &local->interfaces, list) {
1705		if (!ieee80211_sdata_running(sdata))
1706			continue;
1707		if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
1708			continue;
1709		sdata->u.ibss.last_scan_completed = jiffies;
1710	}
1711}
1712
1713int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
1714			struct cfg80211_ibss_params *params)
1715{
1716	u64 changed = 0;
1717	u32 rate_flags;
1718	struct ieee80211_supported_band *sband;
1719	enum ieee80211_chanctx_mode chanmode;
1720	struct ieee80211_local *local = sdata->local;
1721	int radar_detect_width = 0;
1722	int i;
1723	int ret;
1724
1725	lockdep_assert_wiphy(local->hw.wiphy);
1726
1727	if (params->chandef.chan->freq_offset) {
1728		/* this may work, but is untested */
1729		return -EOPNOTSUPP;
1730	}
1731
1732	ret = cfg80211_chandef_dfs_required(local->hw.wiphy,
1733					    &params->chandef,
1734					    sdata->wdev.iftype);
1735	if (ret < 0)
1736		return ret;
1737
1738	if (ret > 0) {
1739		if (!params->userspace_handles_dfs)
1740			return -EINVAL;
1741		radar_detect_width = BIT(params->chandef.width);
1742	}
1743
1744	chanmode = (params->channel_fixed && !ret) ?
1745		IEEE80211_CHANCTX_SHARED : IEEE80211_CHANCTX_EXCLUSIVE;
1746
1747	ret = ieee80211_check_combinations(sdata, &params->chandef, chanmode,
1748					   radar_detect_width);
1749	if (ret < 0)
1750		return ret;
1751
1752	if (params->bssid) {
1753		memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN);
1754		sdata->u.ibss.fixed_bssid = true;
1755	} else
1756		sdata->u.ibss.fixed_bssid = false;
1757
1758	sdata->u.ibss.privacy = params->privacy;
1759	sdata->u.ibss.control_port = params->control_port;
1760	sdata->u.ibss.userspace_handles_dfs = params->userspace_handles_dfs;
1761	sdata->u.ibss.basic_rates = params->basic_rates;
1762	sdata->u.ibss.last_scan_completed = jiffies;
1763
1764	/* fix basic_rates if channel does not support these rates */
1765	rate_flags = ieee80211_chandef_rate_flags(&params->chandef);
1766	sband = local->hw.wiphy->bands[params->chandef.chan->band];
1767	for (i = 0; i < sband->n_bitrates; i++) {
1768		if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
1769			sdata->u.ibss.basic_rates &= ~BIT(i);
1770	}
1771	memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate,
1772	       sizeof(params->mcast_rate));
1773
1774	sdata->vif.bss_conf.beacon_int = params->beacon_interval;
1775
1776	sdata->u.ibss.chandef = params->chandef;
1777	sdata->u.ibss.fixed_channel = params->channel_fixed;
1778
1779	if (params->ie) {
1780		sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len,
1781					   GFP_KERNEL);
1782		if (sdata->u.ibss.ie)
1783			sdata->u.ibss.ie_len = params->ie_len;
1784	}
1785
1786	sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
1787	sdata->u.ibss.ibss_join_req = jiffies;
1788
1789	memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len);
1790	sdata->u.ibss.ssid_len = params->ssid_len;
1791
1792	memcpy(&sdata->u.ibss.ht_capa, &params->ht_capa,
1793	       sizeof(sdata->u.ibss.ht_capa));
1794	memcpy(&sdata->u.ibss.ht_capa_mask, &params->ht_capa_mask,
1795	       sizeof(sdata->u.ibss.ht_capa_mask));
1796
1797	/*
1798	 * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is
1799	 * reserved, but an HT STA shall protect HT transmissions as though
1800	 * the HT Protection field were set to non-HT mixed mode.
1801	 *
1802	 * In an IBSS, the RIFS Mode field of the HT Operation element is
1803	 * also reserved, but an HT STA shall operate as though this field
1804	 * were set to 1.
1805	 */
1806
1807	sdata->vif.bss_conf.ht_operation_mode |=
1808		  IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED
1809		| IEEE80211_HT_PARAM_RIFS_MODE;
1810
1811	changed |= BSS_CHANGED_HT | BSS_CHANGED_MCAST_RATE;
1812	ieee80211_link_info_change_notify(sdata, &sdata->deflink, changed);
1813
1814	sdata->deflink.smps_mode = IEEE80211_SMPS_OFF;
1815	sdata->deflink.needed_rx_chains = local->rx_chains;
1816	sdata->control_port_over_nl80211 = params->control_port_over_nl80211;
1817
1818	wiphy_work_queue(local->hw.wiphy, &sdata->work);
1819
1820	return 0;
1821}
1822
1823int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata)
1824{
1825	struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1826
1827	ieee80211_ibss_disconnect(sdata);
1828	ifibss->ssid_len = 0;
1829	eth_zero_addr(ifibss->bssid);
1830
1831	/* remove beacon */
1832	kfree(sdata->u.ibss.ie);
1833	sdata->u.ibss.ie = NULL;
1834	sdata->u.ibss.ie_len = 0;
1835
1836	/* on the next join, re-program HT parameters */
1837	memset(&ifibss->ht_capa, 0, sizeof(ifibss->ht_capa));
1838	memset(&ifibss->ht_capa_mask, 0, sizeof(ifibss->ht_capa_mask));
1839
1840	synchronize_rcu();
1841
1842	skb_queue_purge(&sdata->skb_queue);
1843
1844	del_timer_sync(&sdata->u.ibss.timer);
1845
1846	return 0;
1847}