1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * mac80211 TDLS handling code
   4 *
   5 * Copyright 2006-2010	Johannes Berg <johannes@sipsolutions.net>
   6 * Copyright 2014, Intel Corporation
   7 * Copyright 2014  Intel Mobile Communications GmbH
   8 * Copyright 2015 - 2016 Intel Deutschland GmbH
   9 * Copyright (C) 2019 Intel Corporation
  10 */
  11
  12#include <linux/ieee80211.h>
  13#include <linux/log2.h>
  14#include <net/cfg80211.h>
  15#include <linux/rtnetlink.h>
  16#include "ieee80211_i.h"
  17#include "driver-ops.h"
  18#include "rate.h"
  19#include "wme.h"
  20
  21/* give usermode some time for retries in setting up the TDLS session */
  22#define TDLS_PEER_SETUP_TIMEOUT	(15 * HZ)
  23
  24void ieee80211_tdls_peer_del_work(struct work_struct *wk)
  25{
  26	struct ieee80211_sub_if_data *sdata;
  27	struct ieee80211_local *local;
  28
  29	sdata = container_of(wk, struct ieee80211_sub_if_data,
  30			     u.mgd.tdls_peer_del_work.work);
  31	local = sdata->local;
  32
  33	mutex_lock(&local->mtx);
 
  34	if (!is_zero_ether_addr(sdata->u.mgd.tdls_peer)) {
  35		tdls_dbg(sdata, "TDLS del peer %pM\n", sdata->u.mgd.tdls_peer);
  36		sta_info_destroy_addr(sdata, sdata->u.mgd.tdls_peer);
  37		eth_zero_addr(sdata->u.mgd.tdls_peer);
  38	}
  39	mutex_unlock(&local->mtx);
  40}
  41
  42static void ieee80211_tdls_add_ext_capab(struct ieee80211_sub_if_data *sdata,
  43					 struct sk_buff *skb)
  44{
 
  45	struct ieee80211_local *local = sdata->local;
  46	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
  47	bool chan_switch = local->hw.wiphy->features &
  48			   NL80211_FEATURE_TDLS_CHANNEL_SWITCH;
  49	bool wider_band = ieee80211_hw_check(&local->hw, TDLS_WIDER_BW) &&
  50			  !ifmgd->tdls_wider_bw_prohibited;
  51	bool buffer_sta = ieee80211_hw_check(&local->hw,
  52					     SUPPORTS_TDLS_BUFFER_STA);
  53	struct ieee80211_supported_band *sband = ieee80211_get_sband(sdata);
  54	bool vht = sband && sband->vht_cap.vht_supported;
  55	u8 *pos = skb_put(skb, 10);
  56
  57	*pos++ = WLAN_EID_EXT_CAPABILITY;
  58	*pos++ = 8; /* len */
  59	*pos++ = 0x0;
  60	*pos++ = 0x0;
  61	*pos++ = 0x0;
  62	*pos++ = (chan_switch ? WLAN_EXT_CAPA4_TDLS_CHAN_SWITCH : 0) |
  63		 (buffer_sta ? WLAN_EXT_CAPA4_TDLS_BUFFER_STA : 0);
  64	*pos++ = WLAN_EXT_CAPA5_TDLS_ENABLED;
  65	*pos++ = 0;
  66	*pos++ = 0;
  67	*pos++ = (vht && wider_band) ? WLAN_EXT_CAPA8_TDLS_WIDE_BW_ENABLED : 0;
  68}
  69
  70static u8
  71ieee80211_tdls_add_subband(struct ieee80211_sub_if_data *sdata,
  72			   struct sk_buff *skb, u16 start, u16 end,
  73			   u16 spacing)
  74{
  75	u8 subband_cnt = 0, ch_cnt = 0;
  76	struct ieee80211_channel *ch;
  77	struct cfg80211_chan_def chandef;
  78	int i, subband_start;
  79	struct wiphy *wiphy = sdata->local->hw.wiphy;
  80
  81	for (i = start; i <= end; i += spacing) {
  82		if (!ch_cnt)
  83			subband_start = i;
  84
  85		ch = ieee80211_get_channel(sdata->local->hw.wiphy, i);
  86		if (ch) {
  87			/* we will be active on the channel */
  88			cfg80211_chandef_create(&chandef, ch,
  89						NL80211_CHAN_NO_HT);
  90			if (cfg80211_reg_can_beacon_relax(wiphy, &chandef,
  91							  sdata->wdev.iftype)) {
  92				ch_cnt++;
  93				/*
  94				 * check if the next channel is also part of
  95				 * this allowed range
  96				 */
  97				continue;
  98			}
  99		}
 100
 101		/*
 102		 * we've reached the end of a range, with allowed channels
 103		 * found
 104		 */
 105		if (ch_cnt) {
 106			u8 *pos = skb_put(skb, 2);
 107			*pos++ = ieee80211_frequency_to_channel(subband_start);
 108			*pos++ = ch_cnt;
 109
 110			subband_cnt++;
 111			ch_cnt = 0;
 112		}
 113	}
 114
 115	/* all channels in the requested range are allowed - add them here */
 116	if (ch_cnt) {
 117		u8 *pos = skb_put(skb, 2);
 118		*pos++ = ieee80211_frequency_to_channel(subband_start);
 119		*pos++ = ch_cnt;
 120
 121		subband_cnt++;
 122	}
 123
 124	return subband_cnt;
 125}
 126
 127static void
 128ieee80211_tdls_add_supp_channels(struct ieee80211_sub_if_data *sdata,
 129				 struct sk_buff *skb)
 130{
 131	/*
 132	 * Add possible channels for TDLS. These are channels that are allowed
 133	 * to be active.
 134	 */
 135	u8 subband_cnt;
 136	u8 *pos = skb_put(skb, 2);
 137
 138	*pos++ = WLAN_EID_SUPPORTED_CHANNELS;
 139
 140	/*
 141	 * 5GHz and 2GHz channels numbers can overlap. Ignore this for now, as
 142	 * this doesn't happen in real world scenarios.
 143	 */
 144
 145	/* 2GHz, with 5MHz spacing */
 146	subband_cnt = ieee80211_tdls_add_subband(sdata, skb, 2412, 2472, 5);
 147
 148	/* 5GHz, with 20MHz spacing */
 149	subband_cnt += ieee80211_tdls_add_subband(sdata, skb, 5000, 5825, 20);
 150
 151	/* length */
 152	*pos = 2 * subband_cnt;
 153}
 154
 155static void ieee80211_tdls_add_oper_classes(struct ieee80211_sub_if_data *sdata,
 156					    struct sk_buff *skb)
 157{
 158	u8 *pos;
 159	u8 op_class;
 160
 161	if (!ieee80211_chandef_to_operating_class(&sdata->vif.bss_conf.chandef,
 162						  &op_class))
 163		return;
 164
 165	pos = skb_put(skb, 4);
 166	*pos++ = WLAN_EID_SUPPORTED_REGULATORY_CLASSES;
 167	*pos++ = 2; /* len */
 168
 169	*pos++ = op_class;
 170	*pos++ = op_class; /* give current operating class as alternate too */
 171}
 172
 173static void ieee80211_tdls_add_bss_coex_ie(struct sk_buff *skb)
 174{
 175	u8 *pos = skb_put(skb, 3);
 176
 177	*pos++ = WLAN_EID_BSS_COEX_2040;
 178	*pos++ = 1; /* len */
 179
 180	*pos++ = WLAN_BSS_COEX_INFORMATION_REQUEST;
 181}
 182
 183static u16 ieee80211_get_tdls_sta_capab(struct ieee80211_sub_if_data *sdata,
 184					u16 status_code)
 185{
 186	struct ieee80211_supported_band *sband;
 187
 188	/* The capability will be 0 when sending a failure code */
 189	if (status_code != 0)
 190		return 0;
 191
 192	sband = ieee80211_get_sband(sdata);
 
 193	if (sband && sband->band == NL80211_BAND_2GHZ) {
 194		return WLAN_CAPABILITY_SHORT_SLOT_TIME |
 195		       WLAN_CAPABILITY_SHORT_PREAMBLE;
 196	}
 197
 198	return 0;
 199}
 200
 201static void ieee80211_tdls_add_link_ie(struct ieee80211_sub_if_data *sdata,
 202				       struct sk_buff *skb, const u8 *peer,
 203				       bool initiator)
 204{
 
 205	struct ieee80211_tdls_lnkie *lnkid;
 206	const u8 *init_addr, *rsp_addr;
 207
 208	if (initiator) {
 209		init_addr = sdata->vif.addr;
 210		rsp_addr = peer;
 211	} else {
 212		init_addr = peer;
 213		rsp_addr = sdata->vif.addr;
 214	}
 215
 216	lnkid = skb_put(skb, sizeof(struct ieee80211_tdls_lnkie));
 217
 218	lnkid->ie_type = WLAN_EID_LINK_ID;
 219	lnkid->ie_len = sizeof(struct ieee80211_tdls_lnkie) - 2;
 220
 221	memcpy(lnkid->bssid, sdata->u.mgd.bssid, ETH_ALEN);
 222	memcpy(lnkid->init_sta, init_addr, ETH_ALEN);
 223	memcpy(lnkid->resp_sta, rsp_addr, ETH_ALEN);
 224}
 225
 226static void
 227ieee80211_tdls_add_aid(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
 228{
 229	u8 *pos = skb_put(skb, 4);
 230
 231	*pos++ = WLAN_EID_AID;
 232	*pos++ = 2; /* len */
 233	put_unaligned_le16(sdata->vif.bss_conf.aid, pos);
 234}
 235
 236/* translate numbering in the WMM parameter IE to the mac80211 notation */
 237static enum ieee80211_ac_numbers ieee80211_ac_from_wmm(int ac)
 238{
 239	switch (ac) {
 240	default:
 241		WARN_ON_ONCE(1);
 242		fallthrough;
 243	case 0:
 244		return IEEE80211_AC_BE;
 245	case 1:
 246		return IEEE80211_AC_BK;
 247	case 2:
 248		return IEEE80211_AC_VI;
 249	case 3:
 250		return IEEE80211_AC_VO;
 251	}
 252}
 253
 254static u8 ieee80211_wmm_aci_aifsn(int aifsn, bool acm, int aci)
 255{
 256	u8 ret;
 257
 258	ret = aifsn & 0x0f;
 259	if (acm)
 260		ret |= 0x10;
 261	ret |= (aci << 5) & 0x60;
 262	return ret;
 263}
 264
 265static u8 ieee80211_wmm_ecw(u16 cw_min, u16 cw_max)
 266{
 267	return ((ilog2(cw_min + 1) << 0x0) & 0x0f) |
 268	       ((ilog2(cw_max + 1) << 0x4) & 0xf0);
 269}
 270
 271static void ieee80211_tdls_add_wmm_param_ie(struct ieee80211_sub_if_data *sdata,
 272					    struct sk_buff *skb)
 273{
 274	struct ieee80211_wmm_param_ie *wmm;
 275	struct ieee80211_tx_queue_params *txq;
 276	int i;
 277
 278	wmm = skb_put_zero(skb, sizeof(*wmm));
 279
 280	wmm->element_id = WLAN_EID_VENDOR_SPECIFIC;
 281	wmm->len = sizeof(*wmm) - 2;
 282
 283	wmm->oui[0] = 0x00; /* Microsoft OUI 00:50:F2 */
 284	wmm->oui[1] = 0x50;
 285	wmm->oui[2] = 0xf2;
 286	wmm->oui_type = 2; /* WME */
 287	wmm->oui_subtype = 1; /* WME param */
 288	wmm->version = 1; /* WME ver */
 289	wmm->qos_info = 0; /* U-APSD not in use */
 290
 291	/*
 292	 * Use the EDCA parameters defined for the BSS, or default if the AP
 293	 * doesn't support it, as mandated by 802.11-2012 section 10.22.4
 294	 */
 295	for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 296		txq = &sdata->tx_conf[ieee80211_ac_from_wmm(i)];
 297		wmm->ac[i].aci_aifsn = ieee80211_wmm_aci_aifsn(txq->aifs,
 298							       txq->acm, i);
 299		wmm->ac[i].cw = ieee80211_wmm_ecw(txq->cw_min, txq->cw_max);
 300		wmm->ac[i].txop_limit = cpu_to_le16(txq->txop);
 301	}
 302}
 303
 304static void
 305ieee80211_tdls_chandef_vht_upgrade(struct ieee80211_sub_if_data *sdata,
 306				   struct sta_info *sta)
 307{
 308	/* IEEE802.11ac-2013 Table E-4 */
 309	u16 centers_80mhz[] = { 5210, 5290, 5530, 5610, 5690, 5775 };
 310	struct cfg80211_chan_def uc = sta->tdls_chandef;
 311	enum nl80211_chan_width max_width = ieee80211_sta_cap_chan_bw(sta);
 
 312	int i;
 313
 314	/* only support upgrading non-narrow channels up to 80Mhz */
 315	if (max_width == NL80211_CHAN_WIDTH_5 ||
 316	    max_width == NL80211_CHAN_WIDTH_10)
 317		return;
 318
 319	if (max_width > NL80211_CHAN_WIDTH_80)
 320		max_width = NL80211_CHAN_WIDTH_80;
 321
 322	if (uc.width >= max_width)
 323		return;
 324	/*
 325	 * Channel usage constrains in the IEEE802.11ac-2013 specification only
 326	 * allow expanding a 20MHz channel to 80MHz in a single way. In
 327	 * addition, there are no 40MHz allowed channels that are not part of
 328	 * the allowed 80MHz range in the 5GHz spectrum (the relevant one here).
 329	 */
 330	for (i = 0; i < ARRAY_SIZE(centers_80mhz); i++)
 331		if (abs(uc.chan->center_freq - centers_80mhz[i]) <= 30) {
 332			uc.center_freq1 = centers_80mhz[i];
 333			uc.center_freq2 = 0;
 334			uc.width = NL80211_CHAN_WIDTH_80;
 335			break;
 336		}
 337
 338	if (!uc.center_freq1)
 339		return;
 340
 341	/* proceed to downgrade the chandef until usable or the same as AP BW */
 342	while (uc.width > max_width ||
 343	       (uc.width > sta->tdls_chandef.width &&
 344		!cfg80211_reg_can_beacon_relax(sdata->local->hw.wiphy, &uc,
 345					       sdata->wdev.iftype)))
 346		ieee80211_chandef_downgrade(&uc);
 347
 348	if (!cfg80211_chandef_identical(&uc, &sta->tdls_chandef)) {
 349		tdls_dbg(sdata, "TDLS ch width upgraded %d -> %d\n",
 350			 sta->tdls_chandef.width, uc.width);
 351
 352		/*
 353		 * the station is not yet authorized when BW upgrade is done,
 354		 * locking is not required
 355		 */
 356		sta->tdls_chandef = uc;
 357	}
 358}
 359
 360static void
 361ieee80211_tdls_add_setup_start_ies(struct ieee80211_sub_if_data *sdata,
 362				   struct sk_buff *skb, const u8 *peer,
 363				   u8 action_code, bool initiator,
 364				   const u8 *extra_ies, size_t extra_ies_len)
 365{
 
 366	struct ieee80211_supported_band *sband;
 367	struct ieee80211_local *local = sdata->local;
 368	struct ieee80211_sta_ht_cap ht_cap;
 369	struct ieee80211_sta_vht_cap vht_cap;
 
 
 370	struct sta_info *sta = NULL;
 371	size_t offset = 0, noffset;
 372	u8 *pos;
 373
 374	sband = ieee80211_get_sband(sdata);
 375	if (!sband)
 376		return;
 377
 378	ieee80211_add_srates_ie(sdata, skb, false, sband->band);
 379	ieee80211_add_ext_srates_ie(sdata, skb, false, sband->band);
 380	ieee80211_tdls_add_supp_channels(sdata, skb);
 381
 382	/* add any custom IEs that go before Extended Capabilities */
 383	if (extra_ies_len) {
 384		static const u8 before_ext_cap[] = {
 385			WLAN_EID_SUPP_RATES,
 386			WLAN_EID_COUNTRY,
 387			WLAN_EID_EXT_SUPP_RATES,
 388			WLAN_EID_SUPPORTED_CHANNELS,
 389			WLAN_EID_RSN,
 390		};
 391		noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
 392					     before_ext_cap,
 393					     ARRAY_SIZE(before_ext_cap),
 394					     offset);
 395		skb_put_data(skb, extra_ies + offset, noffset - offset);
 396		offset = noffset;
 397	}
 398
 399	ieee80211_tdls_add_ext_capab(sdata, skb);
 400
 401	/* add the QoS element if we support it */
 402	if (local->hw.queues >= IEEE80211_NUM_ACS &&
 403	    action_code != WLAN_PUB_ACTION_TDLS_DISCOVER_RES)
 404		ieee80211_add_wmm_info_ie(skb_put(skb, 9), 0); /* no U-APSD */
 405
 406	/* add any custom IEs that go before HT capabilities */
 407	if (extra_ies_len) {
 408		static const u8 before_ht_cap[] = {
 409			WLAN_EID_SUPP_RATES,
 410			WLAN_EID_COUNTRY,
 411			WLAN_EID_EXT_SUPP_RATES,
 412			WLAN_EID_SUPPORTED_CHANNELS,
 413			WLAN_EID_RSN,
 414			WLAN_EID_EXT_CAPABILITY,
 415			WLAN_EID_QOS_CAPA,
 416			WLAN_EID_FAST_BSS_TRANSITION,
 417			WLAN_EID_TIMEOUT_INTERVAL,
 418			WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 419		};
 420		noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
 421					     before_ht_cap,
 422					     ARRAY_SIZE(before_ht_cap),
 423					     offset);
 424		skb_put_data(skb, extra_ies + offset, noffset - offset);
 425		offset = noffset;
 426	}
 427
 428	mutex_lock(&local->sta_mtx);
 429
 430	/* we should have the peer STA if we're already responding */
 431	if (action_code == WLAN_TDLS_SETUP_RESPONSE) {
 432		sta = sta_info_get(sdata, peer);
 433		if (WARN_ON_ONCE(!sta)) {
 434			mutex_unlock(&local->sta_mtx);
 435			return;
 436		}
 437
 438		sta->tdls_chandef = sdata->vif.bss_conf.chandef;
 439	}
 440
 441	ieee80211_tdls_add_oper_classes(sdata, skb);
 442
 443	/*
 444	 * with TDLS we can switch channels, and HT-caps are not necessarily
 445	 * the same on all bands. The specification limits the setup to a
 446	 * single HT-cap, so use the current band for now.
 447	 */
 448	memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
 449
 450	if ((action_code == WLAN_TDLS_SETUP_REQUEST ||
 451	     action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) &&
 452	    ht_cap.ht_supported) {
 453		ieee80211_apply_htcap_overrides(sdata, &ht_cap);
 454
 455		/* disable SMPS in TDLS initiator */
 456		ht_cap.cap |= WLAN_HT_CAP_SM_PS_DISABLED
 457				<< IEEE80211_HT_CAP_SM_PS_SHIFT;
 458
 459		pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
 460		ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap);
 461	} else if (action_code == WLAN_TDLS_SETUP_RESPONSE &&
 462		   ht_cap.ht_supported && sta->sta.ht_cap.ht_supported) {
 463		/* the peer caps are already intersected with our own */
 464		memcpy(&ht_cap, &sta->sta.ht_cap, sizeof(ht_cap));
 465
 466		pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
 467		ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap);
 468	}
 469
 470	if (ht_cap.ht_supported &&
 471	    (ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40))
 472		ieee80211_tdls_add_bss_coex_ie(skb);
 473
 474	ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
 475
 476	/* add any custom IEs that go before VHT capabilities */
 477	if (extra_ies_len) {
 478		static const u8 before_vht_cap[] = {
 479			WLAN_EID_SUPP_RATES,
 480			WLAN_EID_COUNTRY,
 481			WLAN_EID_EXT_SUPP_RATES,
 482			WLAN_EID_SUPPORTED_CHANNELS,
 483			WLAN_EID_RSN,
 484			WLAN_EID_EXT_CAPABILITY,
 485			WLAN_EID_QOS_CAPA,
 486			WLAN_EID_FAST_BSS_TRANSITION,
 487			WLAN_EID_TIMEOUT_INTERVAL,
 488			WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 489			WLAN_EID_MULTI_BAND,
 490		};
 491		noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
 492					     before_vht_cap,
 493					     ARRAY_SIZE(before_vht_cap),
 494					     offset);
 495		skb_put_data(skb, extra_ies + offset, noffset - offset);
 496		offset = noffset;
 497	}
 498
 499	/* build the VHT-cap similarly to the HT-cap */
 500	memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap));
 
 
 
 
 
 
 
 
 501	if ((action_code == WLAN_TDLS_SETUP_REQUEST ||
 502	     action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) &&
 503	    vht_cap.vht_supported) {
 504		ieee80211_apply_vhtcap_overrides(sdata, &vht_cap);
 505
 506		/* the AID is present only when VHT is implemented */
 507		if (action_code == WLAN_TDLS_SETUP_REQUEST)
 508			ieee80211_tdls_add_aid(sdata, skb);
 509
 510		pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
 511		ieee80211_ie_build_vht_cap(pos, &vht_cap, vht_cap.cap);
 512	} else if (action_code == WLAN_TDLS_SETUP_RESPONSE &&
 513		   vht_cap.vht_supported && sta->sta.vht_cap.vht_supported) {
 514		/* the peer caps are already intersected with our own */
 515		memcpy(&vht_cap, &sta->sta.vht_cap, sizeof(vht_cap));
 516
 517		/* the AID is present only when VHT is implemented */
 518		ieee80211_tdls_add_aid(sdata, skb);
 519
 520		pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
 521		ieee80211_ie_build_vht_cap(pos, &vht_cap, vht_cap.cap);
 522
 523		/*
 524		 * if both peers support WIDER_BW, we can expand the chandef to
 525		 * a wider compatible one, up to 80MHz
 526		 */
 527		if (test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW))
 528			ieee80211_tdls_chandef_vht_upgrade(sdata, sta);
 529	}
 530
 531	mutex_unlock(&local->sta_mtx);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 532
 533	/* add any remaining IEs */
 534	if (extra_ies_len) {
 535		noffset = extra_ies_len;
 536		skb_put_data(skb, extra_ies + offset, noffset - offset);
 537	}
 538
 539}
 540
 541static void
 542ieee80211_tdls_add_setup_cfm_ies(struct ieee80211_sub_if_data *sdata,
 543				 struct sk_buff *skb, const u8 *peer,
 544				 bool initiator, const u8 *extra_ies,
 545				 size_t extra_ies_len)
 546{
 
 547	struct ieee80211_local *local = sdata->local;
 548	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 549	size_t offset = 0, noffset;
 550	struct sta_info *sta, *ap_sta;
 551	struct ieee80211_supported_band *sband;
 552	u8 *pos;
 553
 554	sband = ieee80211_get_sband(sdata);
 555	if (!sband)
 556		return;
 557
 558	mutex_lock(&local->sta_mtx);
 559
 560	sta = sta_info_get(sdata, peer);
 561	ap_sta = sta_info_get(sdata, ifmgd->bssid);
 562	if (WARN_ON_ONCE(!sta || !ap_sta)) {
 563		mutex_unlock(&local->sta_mtx);
 564		return;
 565	}
 566
 567	sta->tdls_chandef = sdata->vif.bss_conf.chandef;
 568
 569	/* add any custom IEs that go before the QoS IE */
 570	if (extra_ies_len) {
 571		static const u8 before_qos[] = {
 572			WLAN_EID_RSN,
 573		};
 574		noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
 575					     before_qos,
 576					     ARRAY_SIZE(before_qos),
 577					     offset);
 578		skb_put_data(skb, extra_ies + offset, noffset - offset);
 579		offset = noffset;
 580	}
 581
 582	/* add the QoS param IE if both the peer and we support it */
 583	if (local->hw.queues >= IEEE80211_NUM_ACS && sta->sta.wme)
 584		ieee80211_tdls_add_wmm_param_ie(sdata, skb);
 585
 586	/* add any custom IEs that go before HT operation */
 587	if (extra_ies_len) {
 588		static const u8 before_ht_op[] = {
 589			WLAN_EID_RSN,
 590			WLAN_EID_QOS_CAPA,
 591			WLAN_EID_FAST_BSS_TRANSITION,
 592			WLAN_EID_TIMEOUT_INTERVAL,
 593		};
 594		noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
 595					     before_ht_op,
 596					     ARRAY_SIZE(before_ht_op),
 597					     offset);
 598		skb_put_data(skb, extra_ies + offset, noffset - offset);
 599		offset = noffset;
 600	}
 601
 602	/*
 603	 * if HT support is only added in TDLS, we need an HT-operation IE.
 604	 * add the IE as required by IEEE802.11-2012 9.23.3.2.
 605	 */
 606	if (!ap_sta->sta.ht_cap.ht_supported && sta->sta.ht_cap.ht_supported) {
 607		u16 prot = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED |
 608			   IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT |
 609			   IEEE80211_HT_OP_MODE_NON_HT_STA_PRSNT;
 610
 611		pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_operation));
 612		ieee80211_ie_build_ht_oper(pos, &sta->sta.ht_cap,
 613					   &sdata->vif.bss_conf.chandef, prot,
 614					   true);
 615	}
 616
 617	ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
 618
 619	/* only include VHT-operation if not on the 2.4GHz band */
 620	if (sband->band != NL80211_BAND_2GHZ &&
 621	    sta->sta.vht_cap.vht_supported) {
 622		/*
 623		 * if both peers support WIDER_BW, we can expand the chandef to
 624		 * a wider compatible one, up to 80MHz
 625		 */
 626		if (test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW))
 627			ieee80211_tdls_chandef_vht_upgrade(sdata, sta);
 628
 629		pos = skb_put(skb, 2 + sizeof(struct ieee80211_vht_operation));
 630		ieee80211_ie_build_vht_oper(pos, &sta->sta.vht_cap,
 631					    &sta->tdls_chandef);
 632	}
 633
 634	mutex_unlock(&local->sta_mtx);
 635
 636	/* add any remaining IEs */
 637	if (extra_ies_len) {
 638		noffset = extra_ies_len;
 639		skb_put_data(skb, extra_ies + offset, noffset - offset);
 640	}
 641}
 642
 643static void
 644ieee80211_tdls_add_chan_switch_req_ies(struct ieee80211_sub_if_data *sdata,
 645				       struct sk_buff *skb, const u8 *peer,
 646				       bool initiator, const u8 *extra_ies,
 647				       size_t extra_ies_len, u8 oper_class,
 648				       struct cfg80211_chan_def *chandef)
 649{
 650	struct ieee80211_tdls_data *tf;
 651	size_t offset = 0, noffset;
 652
 653	if (WARN_ON_ONCE(!chandef))
 654		return;
 655
 656	tf = (void *)skb->data;
 657	tf->u.chan_switch_req.target_channel =
 658		ieee80211_frequency_to_channel(chandef->chan->center_freq);
 659	tf->u.chan_switch_req.oper_class = oper_class;
 660
 661	if (extra_ies_len) {
 662		static const u8 before_lnkie[] = {
 663			WLAN_EID_SECONDARY_CHANNEL_OFFSET,
 664		};
 665		noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
 666					     before_lnkie,
 667					     ARRAY_SIZE(before_lnkie),
 668					     offset);
 669		skb_put_data(skb, extra_ies + offset, noffset - offset);
 670		offset = noffset;
 671	}
 672
 673	ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
 674
 675	/* add any remaining IEs */
 676	if (extra_ies_len) {
 677		noffset = extra_ies_len;
 678		skb_put_data(skb, extra_ies + offset, noffset - offset);
 679	}
 680}
 681
 682static void
 683ieee80211_tdls_add_chan_switch_resp_ies(struct ieee80211_sub_if_data *sdata,
 684					struct sk_buff *skb, const u8 *peer,
 685					u16 status_code, bool initiator,
 686					const u8 *extra_ies,
 687					size_t extra_ies_len)
 688{
 689	if (status_code == 0)
 690		ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
 691
 692	if (extra_ies_len)
 693		skb_put_data(skb, extra_ies, extra_ies_len);
 694}
 695
 696static void ieee80211_tdls_add_ies(struct ieee80211_sub_if_data *sdata,
 697				   struct sk_buff *skb, const u8 *peer,
 698				   u8 action_code, u16 status_code,
 699				   bool initiator, const u8 *extra_ies,
 700				   size_t extra_ies_len, u8 oper_class,
 701				   struct cfg80211_chan_def *chandef)
 702{
 703	switch (action_code) {
 704	case WLAN_TDLS_SETUP_REQUEST:
 705	case WLAN_TDLS_SETUP_RESPONSE:
 706	case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
 707		if (status_code == 0)
 708			ieee80211_tdls_add_setup_start_ies(sdata, skb, peer,
 
 709							   action_code,
 710							   initiator,
 711							   extra_ies,
 712							   extra_ies_len);
 713		break;
 714	case WLAN_TDLS_SETUP_CONFIRM:
 715		if (status_code == 0)
 716			ieee80211_tdls_add_setup_cfm_ies(sdata, skb, peer,
 717							 initiator, extra_ies,
 718							 extra_ies_len);
 719		break;
 720	case WLAN_TDLS_TEARDOWN:
 721	case WLAN_TDLS_DISCOVERY_REQUEST:
 722		if (extra_ies_len)
 723			skb_put_data(skb, extra_ies, extra_ies_len);
 724		if (status_code == 0 || action_code == WLAN_TDLS_TEARDOWN)
 725			ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
 
 726		break;
 727	case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
 728		ieee80211_tdls_add_chan_switch_req_ies(sdata, skb, peer,
 729						       initiator, extra_ies,
 730						       extra_ies_len,
 731						       oper_class, chandef);
 732		break;
 733	case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
 734		ieee80211_tdls_add_chan_switch_resp_ies(sdata, skb, peer,
 735							status_code,
 736							initiator, extra_ies,
 737							extra_ies_len);
 738		break;
 739	}
 740
 741}
 742
 743static int
 744ieee80211_prep_tdls_encap_data(struct wiphy *wiphy, struct net_device *dev,
 
 745			       const u8 *peer, u8 action_code, u8 dialog_token,
 746			       u16 status_code, struct sk_buff *skb)
 747{
 748	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 749	struct ieee80211_tdls_data *tf;
 750
 751	tf = skb_put(skb, offsetof(struct ieee80211_tdls_data, u));
 752
 753	memcpy(tf->da, peer, ETH_ALEN);
 754	memcpy(tf->sa, sdata->vif.addr, ETH_ALEN);
 755	tf->ether_type = cpu_to_be16(ETH_P_TDLS);
 756	tf->payload_type = WLAN_TDLS_SNAP_RFTYPE;
 757
 758	/* network header is after the ethernet header */
 759	skb_set_network_header(skb, ETH_HLEN);
 760
 761	switch (action_code) {
 762	case WLAN_TDLS_SETUP_REQUEST:
 763		tf->category = WLAN_CATEGORY_TDLS;
 764		tf->action_code = WLAN_TDLS_SETUP_REQUEST;
 765
 766		skb_put(skb, sizeof(tf->u.setup_req));
 767		tf->u.setup_req.dialog_token = dialog_token;
 768		tf->u.setup_req.capability =
 769			cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata,
 770								 status_code));
 771		break;
 772	case WLAN_TDLS_SETUP_RESPONSE:
 773		tf->category = WLAN_CATEGORY_TDLS;
 774		tf->action_code = WLAN_TDLS_SETUP_RESPONSE;
 775
 776		skb_put(skb, sizeof(tf->u.setup_resp));
 777		tf->u.setup_resp.status_code = cpu_to_le16(status_code);
 778		tf->u.setup_resp.dialog_token = dialog_token;
 779		tf->u.setup_resp.capability =
 780			cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata,
 781								 status_code));
 782		break;
 783	case WLAN_TDLS_SETUP_CONFIRM:
 784		tf->category = WLAN_CATEGORY_TDLS;
 785		tf->action_code = WLAN_TDLS_SETUP_CONFIRM;
 786
 787		skb_put(skb, sizeof(tf->u.setup_cfm));
 788		tf->u.setup_cfm.status_code = cpu_to_le16(status_code);
 789		tf->u.setup_cfm.dialog_token = dialog_token;
 790		break;
 791	case WLAN_TDLS_TEARDOWN:
 792		tf->category = WLAN_CATEGORY_TDLS;
 793		tf->action_code = WLAN_TDLS_TEARDOWN;
 794
 795		skb_put(skb, sizeof(tf->u.teardown));
 796		tf->u.teardown.reason_code = cpu_to_le16(status_code);
 797		break;
 798	case WLAN_TDLS_DISCOVERY_REQUEST:
 799		tf->category = WLAN_CATEGORY_TDLS;
 800		tf->action_code = WLAN_TDLS_DISCOVERY_REQUEST;
 801
 802		skb_put(skb, sizeof(tf->u.discover_req));
 803		tf->u.discover_req.dialog_token = dialog_token;
 804		break;
 805	case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
 806		tf->category = WLAN_CATEGORY_TDLS;
 807		tf->action_code = WLAN_TDLS_CHANNEL_SWITCH_REQUEST;
 808
 809		skb_put(skb, sizeof(tf->u.chan_switch_req));
 810		break;
 811	case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
 812		tf->category = WLAN_CATEGORY_TDLS;
 813		tf->action_code = WLAN_TDLS_CHANNEL_SWITCH_RESPONSE;
 814
 815		skb_put(skb, sizeof(tf->u.chan_switch_resp));
 816		tf->u.chan_switch_resp.status_code = cpu_to_le16(status_code);
 817		break;
 818	default:
 819		return -EINVAL;
 820	}
 821
 822	return 0;
 823}
 824
 825static int
 826ieee80211_prep_tdls_direct(struct wiphy *wiphy, struct net_device *dev,
 827			   const u8 *peer, u8 action_code, u8 dialog_token,
 
 828			   u16 status_code, struct sk_buff *skb)
 829{
 830	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 831	struct ieee80211_mgmt *mgmt;
 832
 833	mgmt = skb_put_zero(skb, 24);
 834	memcpy(mgmt->da, peer, ETH_ALEN);
 835	memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 836	memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN);
 837
 838	mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 839					  IEEE80211_STYPE_ACTION);
 840
 841	switch (action_code) {
 842	case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
 843		skb_put(skb, 1 + sizeof(mgmt->u.action.u.tdls_discover_resp));
 844		mgmt->u.action.category = WLAN_CATEGORY_PUBLIC;
 845		mgmt->u.action.u.tdls_discover_resp.action_code =
 846			WLAN_PUB_ACTION_TDLS_DISCOVER_RES;
 847		mgmt->u.action.u.tdls_discover_resp.dialog_token =
 848			dialog_token;
 849		mgmt->u.action.u.tdls_discover_resp.capability =
 850			cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata,
 851								 status_code));
 852		break;
 853	default:
 854		return -EINVAL;
 855	}
 856
 857	return 0;
 858}
 859
 860static struct sk_buff *
 861ieee80211_tdls_build_mgmt_packet_data(struct ieee80211_sub_if_data *sdata,
 862				      const u8 *peer, u8 action_code,
 863				      u8 dialog_token, u16 status_code,
 864				      bool initiator, const u8 *extra_ies,
 865				      size_t extra_ies_len, u8 oper_class,
 
 866				      struct cfg80211_chan_def *chandef)
 867{
 868	struct ieee80211_local *local = sdata->local;
 869	struct sk_buff *skb;
 870	int ret;
 
 
 
 
 
 
 
 871
 872	skb = netdev_alloc_skb(sdata->dev,
 873			       local->hw.extra_tx_headroom +
 874			       max(sizeof(struct ieee80211_mgmt),
 875				   sizeof(struct ieee80211_tdls_data)) +
 876			       50 + /* supported rates */
 877			       10 + /* ext capab */
 878			       26 + /* max(WMM-info, WMM-param) */
 879			       2 + max(sizeof(struct ieee80211_ht_cap),
 880				       sizeof(struct ieee80211_ht_operation)) +
 881			       2 + max(sizeof(struct ieee80211_vht_cap),
 882				       sizeof(struct ieee80211_vht_operation)) +
 
 
 
 
 
 
 
 883			       50 + /* supported channels */
 884			       3 + /* 40/20 BSS coex */
 885			       4 + /* AID */
 886			       4 + /* oper classes */
 887			       extra_ies_len +
 888			       sizeof(struct ieee80211_tdls_lnkie));
 889	if (!skb)
 890		return NULL;
 891
 892	skb_reserve(skb, local->hw.extra_tx_headroom);
 893
 894	switch (action_code) {
 895	case WLAN_TDLS_SETUP_REQUEST:
 896	case WLAN_TDLS_SETUP_RESPONSE:
 897	case WLAN_TDLS_SETUP_CONFIRM:
 898	case WLAN_TDLS_TEARDOWN:
 899	case WLAN_TDLS_DISCOVERY_REQUEST:
 900	case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
 901	case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
 902		ret = ieee80211_prep_tdls_encap_data(local->hw.wiphy,
 903						     sdata->dev, peer,
 904						     action_code, dialog_token,
 905						     status_code, skb);
 906		break;
 907	case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
 908		ret = ieee80211_prep_tdls_direct(local->hw.wiphy, sdata->dev,
 909						 peer, action_code,
 910						 dialog_token, status_code,
 911						 skb);
 912		break;
 913	default:
 914		ret = -ENOTSUPP;
 915		break;
 916	}
 917
 918	if (ret < 0)
 919		goto fail;
 920
 921	ieee80211_tdls_add_ies(sdata, skb, peer, action_code, status_code,
 922			       initiator, extra_ies, extra_ies_len, oper_class,
 923			       chandef);
 
 924	return skb;
 925
 926fail:
 927	dev_kfree_skb(skb);
 
 
 928	return NULL;
 929}
 930
 931static int
 932ieee80211_tdls_prep_mgmt_packet(struct wiphy *wiphy, struct net_device *dev,
 933				const u8 *peer, u8 action_code, u8 dialog_token,
 
 934				u16 status_code, u32 peer_capability,
 935				bool initiator, const u8 *extra_ies,
 936				size_t extra_ies_len, u8 oper_class,
 937				struct cfg80211_chan_def *chandef)
 938{
 939	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 940	struct sk_buff *skb = NULL;
 941	struct sta_info *sta;
 942	u32 flags = 0;
 943	int ret = 0;
 944
 945	rcu_read_lock();
 946	sta = sta_info_get(sdata, peer);
 947
 948	/* infer the initiator if we can, to support old userspace */
 949	switch (action_code) {
 950	case WLAN_TDLS_SETUP_REQUEST:
 951		if (sta) {
 952			set_sta_flag(sta, WLAN_STA_TDLS_INITIATOR);
 953			sta->sta.tdls_initiator = false;
 954		}
 955		fallthrough;
 956	case WLAN_TDLS_SETUP_CONFIRM:
 957	case WLAN_TDLS_DISCOVERY_REQUEST:
 958		initiator = true;
 959		break;
 960	case WLAN_TDLS_SETUP_RESPONSE:
 961		/*
 962		 * In some testing scenarios, we send a request and response.
 963		 * Make the last packet sent take effect for the initiator
 964		 * value.
 965		 */
 966		if (sta) {
 967			clear_sta_flag(sta, WLAN_STA_TDLS_INITIATOR);
 968			sta->sta.tdls_initiator = true;
 969		}
 970		fallthrough;
 971	case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
 972		initiator = false;
 973		break;
 974	case WLAN_TDLS_TEARDOWN:
 975	case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
 976	case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
 977		/* any value is ok */
 978		break;
 979	default:
 980		ret = -ENOTSUPP;
 981		break;
 982	}
 983
 984	if (sta && test_sta_flag(sta, WLAN_STA_TDLS_INITIATOR))
 985		initiator = true;
 986
 987	rcu_read_unlock();
 988	if (ret < 0)
 989		goto fail;
 990
 991	skb = ieee80211_tdls_build_mgmt_packet_data(sdata, peer, action_code,
 
 992						    dialog_token, status_code,
 993						    initiator, extra_ies,
 994						    extra_ies_len, oper_class,
 995						    chandef);
 996	if (!skb) {
 997		ret = -EINVAL;
 998		goto fail;
 999	}
1000
1001	if (action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) {
1002		ieee80211_tx_skb(sdata, skb);
1003		return 0;
1004	}
1005
1006	/*
1007	 * According to 802.11z: Setup req/resp are sent in AC_BK, otherwise
1008	 * we should default to AC_VI.
1009	 */
1010	switch (action_code) {
1011	case WLAN_TDLS_SETUP_REQUEST:
1012	case WLAN_TDLS_SETUP_RESPONSE:
1013		skb->priority = 256 + 2;
1014		break;
1015	default:
1016		skb->priority = 256 + 5;
1017		break;
1018	}
1019	skb_set_queue_mapping(skb, ieee80211_select_queue(sdata, skb));
1020
1021	/*
1022	 * Set the WLAN_TDLS_TEARDOWN flag to indicate a teardown in progress.
1023	 * Later, if no ACK is returned from peer, we will re-send the teardown
1024	 * packet through the AP.
1025	 */
1026	if ((action_code == WLAN_TDLS_TEARDOWN) &&
1027	    ieee80211_hw_check(&sdata->local->hw, REPORTS_TX_ACK_STATUS)) {
1028		bool try_resend; /* Should we keep skb for possible resend */
1029
1030		/* If not sending directly to peer - no point in keeping skb */
1031		rcu_read_lock();
1032		sta = sta_info_get(sdata, peer);
1033		try_resend = sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
1034		rcu_read_unlock();
1035
1036		spin_lock_bh(&sdata->u.mgd.teardown_lock);
1037		if (try_resend && !sdata->u.mgd.teardown_skb) {
1038			/* Mark it as requiring TX status callback  */
1039			flags |= IEEE80211_TX_CTL_REQ_TX_STATUS |
1040				 IEEE80211_TX_INTFL_MLME_CONN_TX;
1041
1042			/*
1043			 * skb is copied since mac80211 will later set
1044			 * properties that might not be the same as the AP,
1045			 * such as encryption, QoS, addresses, etc.
1046			 *
1047			 * No problem if skb_copy() fails, so no need to check.
1048			 */
1049			sdata->u.mgd.teardown_skb = skb_copy(skb, GFP_ATOMIC);
1050			sdata->u.mgd.orig_teardown_skb = skb;
1051		}
1052		spin_unlock_bh(&sdata->u.mgd.teardown_lock);
1053	}
1054
1055	/* disable bottom halves when entering the Tx path */
1056	local_bh_disable();
1057	__ieee80211_subif_start_xmit(skb, dev, flags, 0, NULL);
 
1058	local_bh_enable();
1059
1060	return ret;
1061
1062fail:
1063	dev_kfree_skb(skb);
1064	return ret;
1065}
1066
1067static int
1068ieee80211_tdls_mgmt_setup(struct wiphy *wiphy, struct net_device *dev,
1069			  const u8 *peer, u8 action_code, u8 dialog_token,
 
1070			  u16 status_code, u32 peer_capability, bool initiator,
1071			  const u8 *extra_ies, size_t extra_ies_len)
1072{
1073	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1074	struct ieee80211_local *local = sdata->local;
1075	enum ieee80211_smps_mode smps_mode = sdata->u.mgd.driver_smps_mode;
 
1076	int ret;
1077
1078	/* don't support setup with forced SMPS mode that's not off */
1079	if (smps_mode != IEEE80211_SMPS_AUTOMATIC &&
1080	    smps_mode != IEEE80211_SMPS_OFF) {
1081		tdls_dbg(sdata, "Aborting TDLS setup due to SMPS mode %d\n",
1082			 smps_mode);
1083		return -ENOTSUPP;
1084	}
1085
1086	mutex_lock(&local->mtx);
1087
1088	/* we don't support concurrent TDLS peer setups */
1089	if (!is_zero_ether_addr(sdata->u.mgd.tdls_peer) &&
1090	    !ether_addr_equal(sdata->u.mgd.tdls_peer, peer)) {
1091		ret = -EBUSY;
1092		goto out_unlock;
1093	}
1094
1095	/*
1096	 * make sure we have a STA representing the peer so we drop or buffer
1097	 * non-TDLS-setup frames to the peer. We can't send other packets
1098	 * during setup through the AP path.
1099	 * Allow error packets to be sent - sometimes we don't even add a STA
1100	 * before failing the setup.
1101	 */
1102	if (status_code == 0) {
1103		rcu_read_lock();
1104		if (!sta_info_get(sdata, peer)) {
1105			rcu_read_unlock();
1106			ret = -ENOLINK;
1107			goto out_unlock;
1108		}
1109		rcu_read_unlock();
1110	}
1111
1112	ieee80211_flush_queues(local, sdata, false);
1113	memcpy(sdata->u.mgd.tdls_peer, peer, ETH_ALEN);
1114	mutex_unlock(&local->mtx);
1115
1116	/* we cannot take the mutex while preparing the setup packet */
1117	ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, action_code,
 
1118					      dialog_token, status_code,
1119					      peer_capability, initiator,
1120					      extra_ies, extra_ies_len, 0,
1121					      NULL);
1122	if (ret < 0) {
1123		mutex_lock(&local->mtx);
1124		eth_zero_addr(sdata->u.mgd.tdls_peer);
1125		mutex_unlock(&local->mtx);
1126		return ret;
1127	}
1128
1129	ieee80211_queue_delayed_work(&sdata->local->hw,
1130				     &sdata->u.mgd.tdls_peer_del_work,
1131				     TDLS_PEER_SETUP_TIMEOUT);
1132	return 0;
1133
1134out_unlock:
1135	mutex_unlock(&local->mtx);
1136	return ret;
1137}
1138
1139static int
1140ieee80211_tdls_mgmt_teardown(struct wiphy *wiphy, struct net_device *dev,
1141			     const u8 *peer, u8 action_code, u8 dialog_token,
 
1142			     u16 status_code, u32 peer_capability,
1143			     bool initiator, const u8 *extra_ies,
1144			     size_t extra_ies_len)
1145{
1146	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1147	struct ieee80211_local *local = sdata->local;
1148	struct sta_info *sta;
1149	int ret;
1150
1151	/*
1152	 * No packets can be transmitted to the peer via the AP during setup -
1153	 * the STA is set as a TDLS peer, but is not authorized.
1154	 * During teardown, we prevent direct transmissions by stopping the
1155	 * queues and flushing all direct packets.
1156	 */
1157	ieee80211_stop_vif_queues(local, sdata,
1158				  IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN);
1159	ieee80211_flush_queues(local, sdata, false);
1160
1161	ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, action_code,
 
1162					      dialog_token, status_code,
1163					      peer_capability, initiator,
1164					      extra_ies, extra_ies_len, 0,
1165					      NULL);
1166	if (ret < 0)
1167		sdata_err(sdata, "Failed sending TDLS teardown packet %d\n",
1168			  ret);
1169
1170	/*
1171	 * Remove the STA AUTH flag to force further traffic through the AP. If
1172	 * the STA was unreachable, it was already removed.
1173	 */
1174	rcu_read_lock();
1175	sta = sta_info_get(sdata, peer);
1176	if (sta)
1177		clear_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
1178	rcu_read_unlock();
1179
1180	ieee80211_wake_vif_queues(local, sdata,
1181				  IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN);
1182
1183	return 0;
1184}
1185
1186int ieee80211_tdls_mgmt(struct wiphy *wiphy, struct net_device *dev,
1187			const u8 *peer, u8 action_code, u8 dialog_token,
1188			u16 status_code, u32 peer_capability,
1189			bool initiator, const u8 *extra_ies,
1190			size_t extra_ies_len)
1191{
1192	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1193	int ret;
1194
1195	if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS))
1196		return -ENOTSUPP;
1197
1198	/* make sure we are in managed mode, and associated */
1199	if (sdata->vif.type != NL80211_IFTYPE_STATION ||
1200	    !sdata->u.mgd.associated)
1201		return -EINVAL;
1202
1203	switch (action_code) {
1204	case WLAN_TDLS_SETUP_REQUEST:
1205	case WLAN_TDLS_SETUP_RESPONSE:
1206		ret = ieee80211_tdls_mgmt_setup(wiphy, dev, peer, action_code,
 
1207						dialog_token, status_code,
1208						peer_capability, initiator,
1209						extra_ies, extra_ies_len);
1210		break;
1211	case WLAN_TDLS_TEARDOWN:
1212		ret = ieee80211_tdls_mgmt_teardown(wiphy, dev, peer,
1213						   action_code, dialog_token,
1214						   status_code,
1215						   peer_capability, initiator,
1216						   extra_ies, extra_ies_len);
1217		break;
1218	case WLAN_TDLS_DISCOVERY_REQUEST:
1219		/*
1220		 * Protect the discovery so we can hear the TDLS discovery
1221		 * response frame. It is transmitted directly and not buffered
1222		 * by the AP.
1223		 */
1224		drv_mgd_protect_tdls_discover(sdata->local, sdata);
1225		fallthrough;
1226	case WLAN_TDLS_SETUP_CONFIRM:
1227	case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
1228		/* no special handling */
1229		ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer,
1230						      action_code,
1231						      dialog_token,
1232						      status_code,
1233						      peer_capability,
1234						      initiator, extra_ies,
1235						      extra_ies_len, 0, NULL);
1236		break;
1237	default:
1238		ret = -EOPNOTSUPP;
1239		break;
1240	}
1241
1242	tdls_dbg(sdata, "TDLS mgmt action %d peer %pM status %d\n",
1243		 action_code, peer, ret);
1244	return ret;
1245}
1246
1247static void iee80211_tdls_recalc_chanctx(struct ieee80211_sub_if_data *sdata,
1248					 struct sta_info *sta)
1249{
1250	struct ieee80211_local *local = sdata->local;
1251	struct ieee80211_chanctx_conf *conf;
1252	struct ieee80211_chanctx *ctx;
1253	enum nl80211_chan_width width;
1254	struct ieee80211_supported_band *sband;
1255
1256	mutex_lock(&local->chanctx_mtx);
1257	conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1258					 lockdep_is_held(&local->chanctx_mtx));
 
1259	if (conf) {
1260		width = conf->def.width;
1261		sband = local->hw.wiphy->bands[conf->def.chan->band];
1262		ctx = container_of(conf, struct ieee80211_chanctx, conf);
1263		ieee80211_recalc_chanctx_chantype(local, ctx);
1264
1265		/* if width changed and a peer is given, update its BW */
1266		if (width != conf->def.width && sta &&
1267		    test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW)) {
1268			enum ieee80211_sta_rx_bandwidth bw;
1269
1270			bw = ieee80211_chan_width_to_rx_bw(conf->def.width);
1271			bw = min(bw, ieee80211_sta_cap_rx_bw(sta));
1272			if (bw != sta->sta.bandwidth) {
1273				sta->sta.bandwidth = bw;
1274				rate_control_rate_update(local, sband, sta,
1275							 IEEE80211_RC_BW_CHANGED);
1276				/*
1277				 * if a TDLS peer BW was updated, we need to
1278				 * recalc the chandef width again, to get the
1279				 * correct chanctx min_def
1280				 */
1281				ieee80211_recalc_chanctx_chantype(local, ctx);
1282			}
1283		}
1284
1285	}
1286	mutex_unlock(&local->chanctx_mtx);
1287}
1288
1289static int iee80211_tdls_have_ht_peers(struct ieee80211_sub_if_data *sdata)
1290{
1291	struct sta_info *sta;
1292	bool result = false;
1293
1294	rcu_read_lock();
1295	list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) {
1296		if (!sta->sta.tdls || sta->sdata != sdata || !sta->uploaded ||
1297		    !test_sta_flag(sta, WLAN_STA_AUTHORIZED) ||
1298		    !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH) ||
1299		    !sta->sta.ht_cap.ht_supported)
1300			continue;
1301		result = true;
1302		break;
1303	}
1304	rcu_read_unlock();
1305
1306	return result;
1307}
1308
1309static void
1310iee80211_tdls_recalc_ht_protection(struct ieee80211_sub_if_data *sdata,
1311				   struct sta_info *sta)
1312{
1313	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1314	bool tdls_ht;
1315	u16 protection = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED |
1316			 IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT |
1317			 IEEE80211_HT_OP_MODE_NON_HT_STA_PRSNT;
1318	u16 opmode;
1319
1320	/* Nothing to do if the BSS connection uses HT */
1321	if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
1322		return;
1323
1324	tdls_ht = (sta && sta->sta.ht_cap.ht_supported) ||
1325		  iee80211_tdls_have_ht_peers(sdata);
1326
1327	opmode = sdata->vif.bss_conf.ht_operation_mode;
1328
1329	if (tdls_ht)
1330		opmode |= protection;
1331	else
1332		opmode &= ~protection;
1333
1334	if (opmode == sdata->vif.bss_conf.ht_operation_mode)
1335		return;
1336
1337	sdata->vif.bss_conf.ht_operation_mode = opmode;
1338	ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_HT);
 
1339}
1340
1341int ieee80211_tdls_oper(struct wiphy *wiphy, struct net_device *dev,
1342			const u8 *peer, enum nl80211_tdls_operation oper)
1343{
1344	struct sta_info *sta;
1345	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1346	struct ieee80211_local *local = sdata->local;
1347	int ret;
1348
 
 
1349	if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS))
1350		return -ENOTSUPP;
1351
1352	if (sdata->vif.type != NL80211_IFTYPE_STATION)
1353		return -EINVAL;
1354
1355	switch (oper) {
1356	case NL80211_TDLS_ENABLE_LINK:
1357	case NL80211_TDLS_DISABLE_LINK:
1358		break;
1359	case NL80211_TDLS_TEARDOWN:
1360	case NL80211_TDLS_SETUP:
1361	case NL80211_TDLS_DISCOVERY_REQ:
1362		/* We don't support in-driver setup/teardown/discovery */
1363		return -ENOTSUPP;
1364	}
1365
1366	/* protect possible bss_conf changes and avoid concurrency in
1367	 * ieee80211_bss_info_change_notify()
1368	 */
1369	sdata_lock(sdata);
1370	mutex_lock(&local->mtx);
1371	tdls_dbg(sdata, "TDLS oper %d peer %pM\n", oper, peer);
1372
1373	switch (oper) {
1374	case NL80211_TDLS_ENABLE_LINK:
1375		if (sdata->vif.csa_active) {
1376			tdls_dbg(sdata, "TDLS: disallow link during CSA\n");
1377			ret = -EBUSY;
1378			break;
1379		}
1380
1381		mutex_lock(&local->sta_mtx);
1382		sta = sta_info_get(sdata, peer);
1383		if (!sta) {
1384			mutex_unlock(&local->sta_mtx);
1385			ret = -ENOLINK;
1386			break;
1387		}
1388
1389		iee80211_tdls_recalc_chanctx(sdata, sta);
1390		iee80211_tdls_recalc_ht_protection(sdata, sta);
1391
1392		set_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
1393		mutex_unlock(&local->sta_mtx);
1394
1395		WARN_ON_ONCE(is_zero_ether_addr(sdata->u.mgd.tdls_peer) ||
1396			     !ether_addr_equal(sdata->u.mgd.tdls_peer, peer));
1397		ret = 0;
1398		break;
1399	case NL80211_TDLS_DISABLE_LINK:
1400		/*
1401		 * The teardown message in ieee80211_tdls_mgmt_teardown() was
1402		 * created while the queues were stopped, so it might still be
1403		 * pending. Before flushing the queues we need to be sure the
1404		 * message is handled by the tasklet handling pending messages,
1405		 * otherwise we might start destroying the station before
1406		 * sending the teardown packet.
1407		 * Note that this only forces the tasklet to flush pendings -
1408		 * not to stop the tasklet from rescheduling itself.
1409		 */
1410		tasklet_kill(&local->tx_pending_tasklet);
1411		/* flush a potentially queued teardown packet */
1412		ieee80211_flush_queues(local, sdata, false);
1413
1414		ret = sta_info_destroy_addr(sdata, peer);
1415
1416		mutex_lock(&local->sta_mtx);
1417		iee80211_tdls_recalc_ht_protection(sdata, NULL);
1418		mutex_unlock(&local->sta_mtx);
1419
1420		iee80211_tdls_recalc_chanctx(sdata, NULL);
 
 
1421		break;
1422	default:
1423		ret = -ENOTSUPP;
1424		break;
1425	}
1426
1427	if (ret == 0 && ether_addr_equal(sdata->u.mgd.tdls_peer, peer)) {
1428		cancel_delayed_work(&sdata->u.mgd.tdls_peer_del_work);
 
1429		eth_zero_addr(sdata->u.mgd.tdls_peer);
1430	}
1431
1432	if (ret == 0)
1433		ieee80211_queue_work(&sdata->local->hw,
1434				     &sdata->u.mgd.request_smps_work);
1435
1436	mutex_unlock(&local->mtx);
1437	sdata_unlock(sdata);
1438	return ret;
1439}
1440
1441void ieee80211_tdls_oper_request(struct ieee80211_vif *vif, const u8 *peer,
1442				 enum nl80211_tdls_operation oper,
1443				 u16 reason_code, gfp_t gfp)
1444{
1445	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1446
1447	if (vif->type != NL80211_IFTYPE_STATION || !vif->bss_conf.assoc) {
1448		sdata_err(sdata, "Discarding TDLS oper %d - not STA or disconnected\n",
1449			  oper);
1450		return;
1451	}
1452
1453	cfg80211_tdls_oper_request(sdata->dev, peer, oper, reason_code, gfp);
1454}
1455EXPORT_SYMBOL(ieee80211_tdls_oper_request);
1456
1457static void
1458iee80211_tdls_add_ch_switch_timing(u8 *buf, u16 switch_time, u16 switch_timeout)
1459{
1460	struct ieee80211_ch_switch_timing *ch_sw;
1461
1462	*buf++ = WLAN_EID_CHAN_SWITCH_TIMING;
1463	*buf++ = sizeof(struct ieee80211_ch_switch_timing);
1464
1465	ch_sw = (void *)buf;
1466	ch_sw->switch_time = cpu_to_le16(switch_time);
1467	ch_sw->switch_timeout = cpu_to_le16(switch_timeout);
1468}
1469
1470/* find switch timing IE in SKB ready for Tx */
1471static const u8 *ieee80211_tdls_find_sw_timing_ie(struct sk_buff *skb)
1472{
1473	struct ieee80211_tdls_data *tf;
1474	const u8 *ie_start;
1475
1476	/*
1477	 * Get the offset for the new location of the switch timing IE.
1478	 * The SKB network header will now point to the "payload_type"
1479	 * element of the TDLS data frame struct.
1480	 */
1481	tf = container_of(skb->data + skb_network_offset(skb),
1482			  struct ieee80211_tdls_data, payload_type);
1483	ie_start = tf->u.chan_switch_req.variable;
1484	return cfg80211_find_ie(WLAN_EID_CHAN_SWITCH_TIMING, ie_start,
1485				skb->len - (ie_start - skb->data));
1486}
1487
1488static struct sk_buff *
1489ieee80211_tdls_ch_sw_tmpl_get(struct sta_info *sta, u8 oper_class,
1490			      struct cfg80211_chan_def *chandef,
1491			      u32 *ch_sw_tm_ie_offset)
1492{
1493	struct ieee80211_sub_if_data *sdata = sta->sdata;
1494	u8 extra_ies[2 + sizeof(struct ieee80211_sec_chan_offs_ie) +
1495		     2 + sizeof(struct ieee80211_ch_switch_timing)];
1496	int extra_ies_len = 2 + sizeof(struct ieee80211_ch_switch_timing);
1497	u8 *pos = extra_ies;
1498	struct sk_buff *skb;
 
1499
1500	/*
1501	 * if chandef points to a wide channel add a Secondary-Channel
1502	 * Offset information element
1503	 */
1504	if (chandef->width == NL80211_CHAN_WIDTH_40) {
1505		struct ieee80211_sec_chan_offs_ie *sec_chan_ie;
1506		bool ht40plus;
1507
1508		*pos++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET;
1509		*pos++ = sizeof(*sec_chan_ie);
1510		sec_chan_ie = (void *)pos;
1511
1512		ht40plus = cfg80211_get_chandef_type(chandef) ==
1513							NL80211_CHAN_HT40PLUS;
1514		sec_chan_ie->sec_chan_offs = ht40plus ?
1515					     IEEE80211_HT_PARAM_CHA_SEC_ABOVE :
1516					     IEEE80211_HT_PARAM_CHA_SEC_BELOW;
1517		pos += sizeof(*sec_chan_ie);
1518
1519		extra_ies_len += 2 + sizeof(struct ieee80211_sec_chan_offs_ie);
1520	}
1521
1522	/* just set the values to 0, this is a template */
1523	iee80211_tdls_add_ch_switch_timing(pos, 0, 0);
1524
1525	skb = ieee80211_tdls_build_mgmt_packet_data(sdata, sta->sta.addr,
 
1526					      WLAN_TDLS_CHANNEL_SWITCH_REQUEST,
1527					      0, 0, !sta->sta.tdls_initiator,
1528					      extra_ies, extra_ies_len,
1529					      oper_class, chandef);
1530	if (!skb)
1531		return NULL;
1532
1533	skb = ieee80211_build_data_template(sdata, skb, 0);
1534	if (IS_ERR(skb)) {
1535		tdls_dbg(sdata, "Failed building TDLS channel switch frame\n");
1536		return NULL;
1537	}
1538
1539	if (ch_sw_tm_ie_offset) {
1540		const u8 *tm_ie = ieee80211_tdls_find_sw_timing_ie(skb);
1541
1542		if (!tm_ie) {
1543			tdls_dbg(sdata, "No switch timing IE in TDLS switch\n");
1544			dev_kfree_skb_any(skb);
1545			return NULL;
1546		}
1547
1548		*ch_sw_tm_ie_offset = tm_ie - skb->data;
1549	}
1550
1551	tdls_dbg(sdata,
1552		 "TDLS channel switch request template for %pM ch %d width %d\n",
1553		 sta->sta.addr, chandef->chan->center_freq, chandef->width);
1554	return skb;
1555}
1556
1557int
1558ieee80211_tdls_channel_switch(struct wiphy *wiphy, struct net_device *dev,
1559			      const u8 *addr, u8 oper_class,
1560			      struct cfg80211_chan_def *chandef)
1561{
1562	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1563	struct ieee80211_local *local = sdata->local;
1564	struct sta_info *sta;
1565	struct sk_buff *skb = NULL;
1566	u32 ch_sw_tm_ie;
1567	int ret;
1568
 
 
1569	if (chandef->chan->freq_offset)
1570		/* this may work, but is untested */
1571		return -EOPNOTSUPP;
1572
1573	mutex_lock(&local->sta_mtx);
1574	sta = sta_info_get(sdata, addr);
1575	if (!sta) {
1576		tdls_dbg(sdata,
1577			 "Invalid TDLS peer %pM for channel switch request\n",
1578			 addr);
1579		ret = -ENOENT;
1580		goto out;
1581	}
1582
1583	if (!test_sta_flag(sta, WLAN_STA_TDLS_CHAN_SWITCH)) {
1584		tdls_dbg(sdata, "TDLS channel switch unsupported by %pM\n",
1585			 addr);
1586		ret = -ENOTSUPP;
1587		goto out;
1588	}
1589
1590	skb = ieee80211_tdls_ch_sw_tmpl_get(sta, oper_class, chandef,
1591					    &ch_sw_tm_ie);
1592	if (!skb) {
1593		ret = -ENOENT;
1594		goto out;
1595	}
1596
1597	ret = drv_tdls_channel_switch(local, sdata, &sta->sta, oper_class,
1598				      chandef, skb, ch_sw_tm_ie);
1599	if (!ret)
1600		set_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL);
1601
1602out:
1603	mutex_unlock(&local->sta_mtx);
1604	dev_kfree_skb_any(skb);
1605	return ret;
1606}
1607
1608void
1609ieee80211_tdls_cancel_channel_switch(struct wiphy *wiphy,
1610				     struct net_device *dev,
1611				     const u8 *addr)
1612{
1613	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1614	struct ieee80211_local *local = sdata->local;
1615	struct sta_info *sta;
1616
1617	mutex_lock(&local->sta_mtx);
 
1618	sta = sta_info_get(sdata, addr);
1619	if (!sta) {
1620		tdls_dbg(sdata,
1621			 "Invalid TDLS peer %pM for channel switch cancel\n",
1622			 addr);
1623		goto out;
1624	}
1625
1626	if (!test_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL)) {
1627		tdls_dbg(sdata, "TDLS channel switch not initiated by %pM\n",
1628			 addr);
1629		goto out;
1630	}
1631
1632	drv_tdls_cancel_channel_switch(local, sdata, &sta->sta);
1633	clear_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL);
1634
1635out:
1636	mutex_unlock(&local->sta_mtx);
1637}
1638
1639static struct sk_buff *
1640ieee80211_tdls_ch_sw_resp_tmpl_get(struct sta_info *sta,
1641				   u32 *ch_sw_tm_ie_offset)
1642{
1643	struct ieee80211_sub_if_data *sdata = sta->sdata;
1644	struct sk_buff *skb;
1645	u8 extra_ies[2 + sizeof(struct ieee80211_ch_switch_timing)];
 
1646
1647	/* initial timing are always zero in the template */
1648	iee80211_tdls_add_ch_switch_timing(extra_ies, 0, 0);
1649
1650	skb = ieee80211_tdls_build_mgmt_packet_data(sdata, sta->sta.addr,
 
1651					WLAN_TDLS_CHANNEL_SWITCH_RESPONSE,
1652					0, 0, !sta->sta.tdls_initiator,
1653					extra_ies, sizeof(extra_ies), 0, NULL);
1654	if (!skb)
1655		return NULL;
1656
1657	skb = ieee80211_build_data_template(sdata, skb, 0);
1658	if (IS_ERR(skb)) {
1659		tdls_dbg(sdata,
1660			 "Failed building TDLS channel switch resp frame\n");
1661		return NULL;
1662	}
1663
1664	if (ch_sw_tm_ie_offset) {
1665		const u8 *tm_ie = ieee80211_tdls_find_sw_timing_ie(skb);
1666
1667		if (!tm_ie) {
1668			tdls_dbg(sdata,
1669				 "No switch timing IE in TDLS switch resp\n");
1670			dev_kfree_skb_any(skb);
1671			return NULL;
1672		}
1673
1674		*ch_sw_tm_ie_offset = tm_ie - skb->data;
1675	}
1676
1677	tdls_dbg(sdata, "TDLS get channel switch response template for %pM\n",
1678		 sta->sta.addr);
1679	return skb;
1680}
1681
1682static int
1683ieee80211_process_tdls_channel_switch_resp(struct ieee80211_sub_if_data *sdata,
1684					   struct sk_buff *skb)
1685{
1686	struct ieee80211_local *local = sdata->local;
1687	struct ieee802_11_elems elems;
1688	struct sta_info *sta;
1689	struct ieee80211_tdls_data *tf = (void *)skb->data;
1690	bool local_initiator;
1691	struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb);
1692	int baselen = offsetof(typeof(*tf), u.chan_switch_resp.variable);
1693	struct ieee80211_tdls_ch_sw_params params = {};
1694	int ret;
1695
 
 
1696	params.action_code = WLAN_TDLS_CHANNEL_SWITCH_RESPONSE;
1697	params.timestamp = rx_status->device_timestamp;
1698
1699	if (skb->len < baselen) {
1700		tdls_dbg(sdata, "TDLS channel switch resp too short: %d\n",
1701			 skb->len);
1702		return -EINVAL;
1703	}
1704
1705	mutex_lock(&local->sta_mtx);
1706	sta = sta_info_get(sdata, tf->sa);
1707	if (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) {
1708		tdls_dbg(sdata, "TDLS chan switch from non-peer sta %pM\n",
1709			 tf->sa);
1710		ret = -EINVAL;
1711		goto out;
1712	}
1713
1714	params.sta = &sta->sta;
1715	params.status = le16_to_cpu(tf->u.chan_switch_resp.status_code);
1716	if (params.status != 0) {
1717		ret = 0;
1718		goto call_drv;
1719	}
1720
1721	ieee802_11_parse_elems(tf->u.chan_switch_resp.variable,
1722			       skb->len - baselen, false, &elems,
1723			       NULL, NULL);
1724	if (elems.parse_error) {
 
 
 
 
1725		tdls_dbg(sdata, "Invalid IEs in TDLS channel switch resp\n");
1726		ret = -EINVAL;
1727		goto out;
1728	}
1729
1730	if (!elems.ch_sw_timing || !elems.lnk_id) {
1731		tdls_dbg(sdata, "TDLS channel switch resp - missing IEs\n");
1732		ret = -EINVAL;
1733		goto out;
1734	}
1735
1736	/* validate the initiator is set correctly */
1737	local_initiator =
1738		!memcmp(elems.lnk_id->init_sta, sdata->vif.addr, ETH_ALEN);
1739	if (local_initiator == sta->sta.tdls_initiator) {
1740		tdls_dbg(sdata, "TDLS chan switch invalid lnk-id initiator\n");
1741		ret = -EINVAL;
1742		goto out;
1743	}
1744
1745	params.switch_time = le16_to_cpu(elems.ch_sw_timing->switch_time);
1746	params.switch_timeout = le16_to_cpu(elems.ch_sw_timing->switch_timeout);
1747
1748	params.tmpl_skb =
1749		ieee80211_tdls_ch_sw_resp_tmpl_get(sta, &params.ch_sw_tm_ie);
1750	if (!params.tmpl_skb) {
1751		ret = -ENOENT;
1752		goto out;
1753	}
1754
1755	ret = 0;
1756call_drv:
1757	drv_tdls_recv_channel_switch(sdata->local, sdata, &params);
1758
1759	tdls_dbg(sdata,
1760		 "TDLS channel switch response received from %pM status %d\n",
1761		 tf->sa, params.status);
1762
1763out:
1764	mutex_unlock(&local->sta_mtx);
1765	dev_kfree_skb_any(params.tmpl_skb);
 
1766	return ret;
1767}
1768
1769static int
1770ieee80211_process_tdls_channel_switch_req(struct ieee80211_sub_if_data *sdata,
1771					  struct sk_buff *skb)
1772{
1773	struct ieee80211_local *local = sdata->local;
1774	struct ieee802_11_elems elems;
1775	struct cfg80211_chan_def chandef;
1776	struct ieee80211_channel *chan;
1777	enum nl80211_channel_type chan_type;
1778	int freq;
1779	u8 target_channel, oper_class;
1780	bool local_initiator;
1781	struct sta_info *sta;
1782	enum nl80211_band band;
1783	struct ieee80211_tdls_data *tf = (void *)skb->data;
1784	struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb);
1785	int baselen = offsetof(typeof(*tf), u.chan_switch_req.variable);
1786	struct ieee80211_tdls_ch_sw_params params = {};
1787	int ret = 0;
1788
 
 
1789	params.action_code = WLAN_TDLS_CHANNEL_SWITCH_REQUEST;
1790	params.timestamp = rx_status->device_timestamp;
1791
1792	if (skb->len < baselen) {
1793		tdls_dbg(sdata, "TDLS channel switch req too short: %d\n",
1794			 skb->len);
1795		return -EINVAL;
1796	}
1797
1798	target_channel = tf->u.chan_switch_req.target_channel;
1799	oper_class = tf->u.chan_switch_req.oper_class;
1800
1801	/*
1802	 * We can't easily infer the channel band. The operating class is
1803	 * ambiguous - there are multiple tables (US/Europe/JP/Global). The
1804	 * solution here is to treat channels with number >14 as 5GHz ones,
1805	 * and specifically check for the (oper_class, channel) combinations
1806	 * where this doesn't hold. These are thankfully unique according to
1807	 * IEEE802.11-2012.
1808	 * We consider only the 2GHz and 5GHz bands and 20MHz+ channels as
1809	 * valid here.
1810	 */
1811	if ((oper_class == 112 || oper_class == 2 || oper_class == 3 ||
1812	     oper_class == 4 || oper_class == 5 || oper_class == 6) &&
1813	     target_channel < 14)
1814		band = NL80211_BAND_5GHZ;
1815	else
1816		band = target_channel < 14 ? NL80211_BAND_2GHZ :
1817					     NL80211_BAND_5GHZ;
1818
1819	freq = ieee80211_channel_to_frequency(target_channel, band);
1820	if (freq == 0) {
1821		tdls_dbg(sdata, "Invalid channel in TDLS chan switch: %d\n",
1822			 target_channel);
1823		return -EINVAL;
1824	}
1825
1826	chan = ieee80211_get_channel(sdata->local->hw.wiphy, freq);
1827	if (!chan) {
1828		tdls_dbg(sdata,
1829			 "Unsupported channel for TDLS chan switch: %d\n",
1830			 target_channel);
1831		return -EINVAL;
1832	}
1833
1834	ieee802_11_parse_elems(tf->u.chan_switch_req.variable,
1835			       skb->len - baselen, false, &elems, NULL, NULL);
1836	if (elems.parse_error) {
 
 
 
1837		tdls_dbg(sdata, "Invalid IEs in TDLS channel switch req\n");
1838		return -EINVAL;
 
1839	}
1840
1841	if (!elems.ch_sw_timing || !elems.lnk_id) {
1842		tdls_dbg(sdata, "TDLS channel switch req - missing IEs\n");
1843		return -EINVAL;
 
1844	}
1845
1846	if (!elems.sec_chan_offs) {
1847		chan_type = NL80211_CHAN_HT20;
1848	} else {
1849		switch (elems.sec_chan_offs->sec_chan_offs) {
1850		case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
1851			chan_type = NL80211_CHAN_HT40PLUS;
1852			break;
1853		case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
1854			chan_type = NL80211_CHAN_HT40MINUS;
1855			break;
1856		default:
1857			chan_type = NL80211_CHAN_HT20;
1858			break;
1859		}
1860	}
1861
1862	cfg80211_chandef_create(&chandef, chan, chan_type);
1863
1864	/* we will be active on the TDLS link */
1865	if (!cfg80211_reg_can_beacon_relax(sdata->local->hw.wiphy, &chandef,
1866					   sdata->wdev.iftype)) {
1867		tdls_dbg(sdata, "TDLS chan switch to forbidden channel\n");
1868		return -EINVAL;
 
1869	}
1870
1871	mutex_lock(&local->sta_mtx);
1872	sta = sta_info_get(sdata, tf->sa);
1873	if (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) {
1874		tdls_dbg(sdata, "TDLS chan switch from non-peer sta %pM\n",
1875			 tf->sa);
1876		ret = -EINVAL;
1877		goto out;
1878	}
1879
1880	params.sta = &sta->sta;
1881
1882	/* validate the initiator is set correctly */
1883	local_initiator =
1884		!memcmp(elems.lnk_id->init_sta, sdata->vif.addr, ETH_ALEN);
1885	if (local_initiator == sta->sta.tdls_initiator) {
1886		tdls_dbg(sdata, "TDLS chan switch invalid lnk-id initiator\n");
1887		ret = -EINVAL;
1888		goto out;
1889	}
1890
1891	/* peer should have known better */
1892	if (!sta->sta.ht_cap.ht_supported && elems.sec_chan_offs &&
1893	    elems.sec_chan_offs->sec_chan_offs) {
1894		tdls_dbg(sdata, "TDLS chan switch - wide chan unsupported\n");
1895		ret = -ENOTSUPP;
1896		goto out;
1897	}
1898
1899	params.chandef = &chandef;
1900	params.switch_time = le16_to_cpu(elems.ch_sw_timing->switch_time);
1901	params.switch_timeout = le16_to_cpu(elems.ch_sw_timing->switch_timeout);
1902
1903	params.tmpl_skb =
1904		ieee80211_tdls_ch_sw_resp_tmpl_get(sta,
1905						   &params.ch_sw_tm_ie);
1906	if (!params.tmpl_skb) {
1907		ret = -ENOENT;
1908		goto out;
1909	}
1910
1911	drv_tdls_recv_channel_switch(sdata->local, sdata, &params);
1912
1913	tdls_dbg(sdata,
1914		 "TDLS ch switch request received from %pM ch %d width %d\n",
1915		 tf->sa, params.chandef->chan->center_freq,
1916		 params.chandef->width);
1917out:
1918	mutex_unlock(&local->sta_mtx);
1919	dev_kfree_skb_any(params.tmpl_skb);
 
 
1920	return ret;
1921}
1922
1923void
1924ieee80211_process_tdls_channel_switch(struct ieee80211_sub_if_data *sdata,
1925				      struct sk_buff *skb)
1926{
1927	struct ieee80211_tdls_data *tf = (void *)skb->data;
1928	struct wiphy *wiphy = sdata->local->hw.wiphy;
1929
1930	lockdep_assert_wiphy(wiphy);
1931
1932	/* make sure the driver supports it */
1933	if (!(wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH))
1934		return;
1935
1936	/* we want to access the entire packet */
1937	if (skb_linearize(skb))
1938		return;
1939	/*
1940	 * The packet/size was already validated by mac80211 Rx path, only look
1941	 * at the action type.
1942	 */
1943	switch (tf->action_code) {
1944	case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
1945		ieee80211_process_tdls_channel_switch_req(sdata, skb);
1946		break;
1947	case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
1948		ieee80211_process_tdls_channel_switch_resp(sdata, skb);
1949		break;
1950	default:
1951		WARN_ON_ONCE(1);
1952		return;
1953	}
1954}
1955
1956void ieee80211_teardown_tdls_peers(struct ieee80211_sub_if_data *sdata)
1957{
1958	struct sta_info *sta;
1959	u16 reason = WLAN_REASON_TDLS_TEARDOWN_UNSPECIFIED;
1960
1961	rcu_read_lock();
1962	list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) {
1963		if (!sta->sta.tdls || sta->sdata != sdata || !sta->uploaded ||
1964		    !test_sta_flag(sta, WLAN_STA_AUTHORIZED))
1965			continue;
1966
1967		ieee80211_tdls_oper_request(&sdata->vif, sta->sta.addr,
1968					    NL80211_TDLS_TEARDOWN, reason,
1969					    GFP_ATOMIC);
1970	}
1971	rcu_read_unlock();
1972}
1973
1974void ieee80211_tdls_handle_disconnect(struct ieee80211_sub_if_data *sdata,
1975				      const u8 *peer, u16 reason)
1976{
1977	struct ieee80211_sta *sta;
1978
1979	rcu_read_lock();
1980	sta = ieee80211_find_sta(&sdata->vif, peer);
1981	if (!sta || !sta->tdls) {
1982		rcu_read_unlock();
1983		return;
1984	}
1985	rcu_read_unlock();
1986
1987	tdls_dbg(sdata, "disconnected from TDLS peer %pM (Reason: %u=%s)\n",
1988		 peer, reason,
1989		 ieee80211_get_reason_code_string(reason));
1990
1991	ieee80211_tdls_oper_request(&sdata->vif, peer,
1992				    NL80211_TDLS_TEARDOWN,
1993				    WLAN_REASON_TDLS_TEARDOWN_UNREACHABLE,
1994				    GFP_ATOMIC);
1995}