tdls.c

   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, 2021-2025 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 wiphy *wiphy, struct wiphy_work *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	lockdep_assert_wiphy(local->hw.wiphy);
  34
  35	if (!is_zero_ether_addr(sdata->u.mgd.tdls_peer)) {
  36		tdls_dbg(sdata, "TDLS del peer %pM\n", sdata->u.mgd.tdls_peer);
  37		sta_info_destroy_addr(sdata, sdata->u.mgd.tdls_peer);
  38		eth_zero_addr(sdata->u.mgd.tdls_peer);
  39	}
  40}
  41
  42static void ieee80211_tdls_add_ext_capab(struct ieee80211_link_data *link,
  43					 struct sk_buff *skb)
  44{
  45	struct ieee80211_sub_if_data *sdata = link->sdata;
  46	struct ieee80211_local *local = sdata->local;
  47	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
  48	bool chan_switch = local->hw.wiphy->features &
  49			   NL80211_FEATURE_TDLS_CHANNEL_SWITCH;
  50	bool wider_band = ieee80211_hw_check(&local->hw, TDLS_WIDER_BW) &&
  51			  !ifmgd->tdls_wider_bw_prohibited;
  52	bool buffer_sta = ieee80211_hw_check(&local->hw,
  53					     SUPPORTS_TDLS_BUFFER_STA);
  54	struct ieee80211_supported_band *sband = ieee80211_get_link_sband(link);
  55	bool vht = sband && sband->vht_cap.vht_supported;
  56	u8 *pos = skb_put(skb, 10);
  57
  58	*pos++ = WLAN_EID_EXT_CAPABILITY;
  59	*pos++ = 8; /* len */
  60	*pos++ = 0x0;
  61	*pos++ = 0x0;
  62	*pos++ = 0x0;
  63	*pos++ = (chan_switch ? WLAN_EXT_CAPA4_TDLS_CHAN_SWITCH : 0) |
  64		 (buffer_sta ? WLAN_EXT_CAPA4_TDLS_BUFFER_STA : 0);
  65	*pos++ = WLAN_EXT_CAPA5_TDLS_ENABLED;
  66	*pos++ = 0;
  67	*pos++ = 0;
  68	*pos++ = (vht && wider_band) ? WLAN_EXT_CAPA8_TDLS_WIDE_BW_ENABLED : 0;
  69}
  70
  71static u8
  72ieee80211_tdls_add_subband(struct ieee80211_sub_if_data *sdata,
  73			   struct sk_buff *skb, u16 start, u16 end,
  74			   u16 spacing)
  75{
  76	u8 subband_cnt = 0, ch_cnt = 0;
  77	struct ieee80211_channel *ch;
  78	struct cfg80211_chan_def chandef;
  79	int i, subband_start;
  80	struct wiphy *wiphy = sdata->local->hw.wiphy;
  81
  82	for (i = start; i <= end; i += spacing) {
  83		if (!ch_cnt)
  84			subband_start = i;
  85
  86		ch = ieee80211_get_channel(sdata->local->hw.wiphy, i);
  87		if (ch) {
  88			/* we will be active on the channel */
  89			cfg80211_chandef_create(&chandef, ch,
  90						NL80211_CHAN_NO_HT);
  91			if (cfg80211_reg_can_beacon_relax(wiphy, &chandef,
  92							  sdata->wdev.iftype)) {
  93				ch_cnt++;
  94				/*
  95				 * check if the next channel is also part of
  96				 * this allowed range
  97				 */
  98				continue;
  99			}
 100		}
 101
 102		/*
 103		 * we've reached the end of a range, with allowed channels
 104		 * found
 105		 */
 106		if (ch_cnt) {
 107			u8 *pos = skb_put(skb, 2);
 108			*pos++ = ieee80211_frequency_to_channel(subband_start);
 109			*pos++ = ch_cnt;
 110
 111			subband_cnt++;
 112			ch_cnt = 0;
 113		}
 114	}
 115
 116	/* all channels in the requested range are allowed - add them here */
 117	if (ch_cnt) {
 118		u8 *pos = skb_put(skb, 2);
 119		*pos++ = ieee80211_frequency_to_channel(subband_start);
 120		*pos++ = ch_cnt;
 121
 122		subband_cnt++;
 123	}
 124
 125	return subband_cnt;
 126}
 127
 128static void
 129ieee80211_tdls_add_supp_channels(struct ieee80211_sub_if_data *sdata,
 130				 struct sk_buff *skb)
 131{
 132	/*
 133	 * Add possible channels for TDLS. These are channels that are allowed
 134	 * to be active.
 135	 */
 136	u8 subband_cnt;
 137	u8 *pos = skb_put(skb, 2);
 138
 139	*pos++ = WLAN_EID_SUPPORTED_CHANNELS;
 140
 141	/*
 142	 * 5GHz and 2GHz channels numbers can overlap. Ignore this for now, as
 143	 * this doesn't happen in real world scenarios.
 144	 */
 145
 146	/* 2GHz, with 5MHz spacing */
 147	subband_cnt = ieee80211_tdls_add_subband(sdata, skb, 2412, 2472, 5);
 148
 149	/* 5GHz, with 20MHz spacing */
 150	subband_cnt += ieee80211_tdls_add_subband(sdata, skb, 5000, 5825, 20);
 151
 152	/* length */
 153	*pos = 2 * subband_cnt;
 154}
 155
 156static void ieee80211_tdls_add_oper_classes(struct ieee80211_link_data *link,
 157					    struct sk_buff *skb)
 158{
 159	u8 *pos;
 160	u8 op_class;
 161
 162	if (!ieee80211_chandef_to_operating_class(&link->conf->chanreq.oper,
 163						  &op_class))
 164		return;
 165
 166	pos = skb_put(skb, 4);
 167	*pos++ = WLAN_EID_SUPPORTED_REGULATORY_CLASSES;
 168	*pos++ = 2; /* len */
 169
 170	*pos++ = op_class;
 171	*pos++ = op_class; /* give current operating class as alternate too */
 172}
 173
 174static void ieee80211_tdls_add_bss_coex_ie(struct sk_buff *skb)
 175{
 176	u8 *pos = skb_put(skb, 3);
 177
 178	*pos++ = WLAN_EID_BSS_COEX_2040;
 179	*pos++ = 1; /* len */
 180
 181	*pos++ = WLAN_BSS_COEX_INFORMATION_REQUEST;
 182}
 183
 184static u16 ieee80211_get_tdls_sta_capab(struct ieee80211_link_data *link,
 185					u16 status_code)
 186{
 187	struct ieee80211_supported_band *sband;
 188
 189	/* The capability will be 0 when sending a failure code */
 190	if (status_code != 0)
 191		return 0;
 192
 193	sband = ieee80211_get_link_sband(link);
 194
 195	if (sband && sband->band == NL80211_BAND_2GHZ) {
 196		return WLAN_CAPABILITY_SHORT_SLOT_TIME |
 197		       WLAN_CAPABILITY_SHORT_PREAMBLE;
 198	}
 199
 200	return 0;
 201}
 202
 203static void ieee80211_tdls_add_link_ie(struct ieee80211_link_data *link,
 204				       struct sk_buff *skb, const u8 *peer,
 205				       bool initiator)
 206{
 207	struct ieee80211_sub_if_data *sdata = link->sdata;
 208	struct ieee80211_tdls_lnkie *lnkid;
 209	const u8 *init_addr, *rsp_addr;
 210
 211	if (initiator) {
 212		init_addr = sdata->vif.addr;
 213		rsp_addr = peer;
 214	} else {
 215		init_addr = peer;
 216		rsp_addr = sdata->vif.addr;
 217	}
 218
 219	lnkid = skb_put(skb, sizeof(struct ieee80211_tdls_lnkie));
 220
 221	lnkid->ie_type = WLAN_EID_LINK_ID;
 222	lnkid->ie_len = sizeof(struct ieee80211_tdls_lnkie) - 2;
 223
 224	memcpy(lnkid->bssid, link->u.mgd.bssid, ETH_ALEN);
 225	memcpy(lnkid->init_sta, init_addr, ETH_ALEN);
 226	memcpy(lnkid->resp_sta, rsp_addr, ETH_ALEN);
 227}
 228
 229static void
 230ieee80211_tdls_add_aid(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
 231{
 232	u8 *pos = skb_put(skb, 4);
 233
 234	*pos++ = WLAN_EID_AID;
 235	*pos++ = 2; /* len */
 236	put_unaligned_le16(sdata->vif.cfg.aid, pos);
 237}
 238
 239/* translate numbering in the WMM parameter IE to the mac80211 notation */
 240static enum ieee80211_ac_numbers ieee80211_ac_from_wmm(int ac)
 241{
 242	switch (ac) {
 243	default:
 244		WARN_ON_ONCE(1);
 245		fallthrough;
 246	case 0:
 247		return IEEE80211_AC_BE;
 248	case 1:
 249		return IEEE80211_AC_BK;
 250	case 2:
 251		return IEEE80211_AC_VI;
 252	case 3:
 253		return IEEE80211_AC_VO;
 254	}
 255}
 256
 257static u8 ieee80211_wmm_aci_aifsn(int aifsn, bool acm, int aci)
 258{
 259	u8 ret;
 260
 261	ret = aifsn & 0x0f;
 262	if (acm)
 263		ret |= 0x10;
 264	ret |= (aci << 5) & 0x60;
 265	return ret;
 266}
 267
 268static u8 ieee80211_wmm_ecw(u16 cw_min, u16 cw_max)
 269{
 270	return ((ilog2(cw_min + 1) << 0x0) & 0x0f) |
 271	       ((ilog2(cw_max + 1) << 0x4) & 0xf0);
 272}
 273
 274static void ieee80211_tdls_add_wmm_param_ie(struct ieee80211_sub_if_data *sdata,
 275					    struct sk_buff *skb)
 276{
 277	struct ieee80211_wmm_param_ie *wmm;
 278	struct ieee80211_tx_queue_params *txq;
 279	int i;
 280
 281	wmm = skb_put_zero(skb, sizeof(*wmm));
 282
 283	wmm->element_id = WLAN_EID_VENDOR_SPECIFIC;
 284	wmm->len = sizeof(*wmm) - 2;
 285
 286	wmm->oui[0] = 0x00; /* Microsoft OUI 00:50:F2 */
 287	wmm->oui[1] = 0x50;
 288	wmm->oui[2] = 0xf2;
 289	wmm->oui_type = 2; /* WME */
 290	wmm->oui_subtype = 1; /* WME param */
 291	wmm->version = 1; /* WME ver */
 292	wmm->qos_info = 0; /* U-APSD not in use */
 293
 294	/*
 295	 * Use the EDCA parameters defined for the BSS, or default if the AP
 296	 * doesn't support it, as mandated by 802.11-2012 section 10.22.4
 297	 */
 298	for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 299		txq = &sdata->deflink.tx_conf[ieee80211_ac_from_wmm(i)];
 300		wmm->ac[i].aci_aifsn = ieee80211_wmm_aci_aifsn(txq->aifs,
 301							       txq->acm, i);
 302		wmm->ac[i].cw = ieee80211_wmm_ecw(txq->cw_min, txq->cw_max);
 303		wmm->ac[i].txop_limit = cpu_to_le16(txq->txop);
 304	}
 305}
 306
 307static void
 308ieee80211_tdls_chandef_vht_upgrade(struct ieee80211_sub_if_data *sdata,
 309				   struct sta_info *sta)
 310{
 311	/* IEEE802.11ac-2013 Table E-4 */
 312	static const u16 centers_80mhz[] = { 5210, 5290, 5530, 5610, 5690, 5775 };
 313	struct cfg80211_chan_def uc = sta->tdls_chandef;
 314	enum nl80211_chan_width max_width =
 315		ieee80211_sta_cap_chan_bw(&sta->deflink);
 316	int i;
 317
 318	/* only support upgrading non-narrow channels up to 80Mhz */
 319	if (max_width == NL80211_CHAN_WIDTH_5 ||
 320	    max_width == NL80211_CHAN_WIDTH_10)
 321		return;
 322
 323	if (max_width > NL80211_CHAN_WIDTH_80)
 324		max_width = NL80211_CHAN_WIDTH_80;
 325
 326	if (uc.width >= max_width)
 327		return;
 328	/*
 329	 * Channel usage constrains in the IEEE802.11ac-2013 specification only
 330	 * allow expanding a 20MHz channel to 80MHz in a single way. In
 331	 * addition, there are no 40MHz allowed channels that are not part of
 332	 * the allowed 80MHz range in the 5GHz spectrum (the relevant one here).
 333	 */
 334	for (i = 0; i < ARRAY_SIZE(centers_80mhz); i++)
 335		if (abs(uc.chan->center_freq - centers_80mhz[i]) <= 30) {
 336			uc.center_freq1 = centers_80mhz[i];
 337			uc.center_freq2 = 0;
 338			uc.width = NL80211_CHAN_WIDTH_80;
 339			break;
 340		}
 341
 342	if (!uc.center_freq1)
 343		return;
 344
 345	/* proceed to downgrade the chandef until usable or the same as AP BW */
 346	while (uc.width > max_width ||
 347	       (uc.width > sta->tdls_chandef.width &&
 348		!cfg80211_reg_can_beacon_relax(sdata->local->hw.wiphy, &uc,
 349					       sdata->wdev.iftype)))
 350		ieee80211_chandef_downgrade(&uc, NULL);
 351
 352	if (!cfg80211_chandef_identical(&uc, &sta->tdls_chandef)) {
 353		tdls_dbg(sdata, "TDLS ch width upgraded %d -> %d\n",
 354			 sta->tdls_chandef.width, uc.width);
 355
 356		/*
 357		 * the station is not yet authorized when BW upgrade is done,
 358		 * locking is not required
 359		 */
 360		sta->tdls_chandef = uc;
 361	}
 362}
 363
 364static void
 365ieee80211_tdls_add_setup_start_ies(struct ieee80211_link_data *link,
 366				   struct sk_buff *skb, const u8 *peer,
 367				   u8 action_code, bool initiator,
 368				   const u8 *extra_ies, size_t extra_ies_len)
 369{
 370	struct ieee80211_sub_if_data *sdata = link->sdata;
 371	struct ieee80211_supported_band *sband;
 372	struct ieee80211_local *local = sdata->local;
 373	struct ieee80211_sta_ht_cap ht_cap;
 374	struct ieee80211_sta_vht_cap vht_cap;
 375	const struct ieee80211_sta_he_cap *he_cap;
 376	const struct ieee80211_sta_eht_cap *eht_cap;
 377	struct sta_info *sta = NULL;
 378	size_t offset = 0, noffset;
 379	u8 *pos;
 380
 381	sband = ieee80211_get_link_sband(link);
 382	if (WARN_ON_ONCE(!sband))
 383		return;
 384
 385	ieee80211_put_srates_elem(skb, sband, 0, 0, WLAN_EID_SUPP_RATES);
 386	ieee80211_put_srates_elem(skb, sband, 0, 0, WLAN_EID_EXT_SUPP_RATES);
 387	ieee80211_tdls_add_supp_channels(sdata, skb);
 388
 389	/* add any custom IEs that go before Extended Capabilities */
 390	if (extra_ies_len) {
 391		static const u8 before_ext_cap[] = {
 392			WLAN_EID_SUPP_RATES,
 393			WLAN_EID_COUNTRY,
 394			WLAN_EID_EXT_SUPP_RATES,
 395			WLAN_EID_SUPPORTED_CHANNELS,
 396			WLAN_EID_RSN,
 397		};
 398		noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
 399					     before_ext_cap,
 400					     ARRAY_SIZE(before_ext_cap),
 401					     offset);
 402		skb_put_data(skb, extra_ies + offset, noffset - offset);
 403		offset = noffset;
 404	}
 405
 406	ieee80211_tdls_add_ext_capab(link, skb);
 407
 408	/* add the QoS element if we support it */
 409	if (local->hw.queues >= IEEE80211_NUM_ACS &&
 410	    action_code != WLAN_PUB_ACTION_TDLS_DISCOVER_RES)
 411		ieee80211_add_wmm_info_ie(skb_put(skb, 9), 0); /* no U-APSD */
 412
 413	/* add any custom IEs that go before HT capabilities */
 414	if (extra_ies_len) {
 415		static const u8 before_ht_cap[] = {
 416			WLAN_EID_SUPP_RATES,
 417			WLAN_EID_COUNTRY,
 418			WLAN_EID_EXT_SUPP_RATES,
 419			WLAN_EID_SUPPORTED_CHANNELS,
 420			WLAN_EID_RSN,
 421			WLAN_EID_EXT_CAPABILITY,
 422			WLAN_EID_QOS_CAPA,
 423			WLAN_EID_FAST_BSS_TRANSITION,
 424			WLAN_EID_TIMEOUT_INTERVAL,
 425			WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 426		};
 427		noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
 428					     before_ht_cap,
 429					     ARRAY_SIZE(before_ht_cap),
 430					     offset);
 431		skb_put_data(skb, extra_ies + offset, noffset - offset);
 432		offset = noffset;
 433	}
 434
 435	/* we should have the peer STA if we're already responding */
 436	if (action_code == WLAN_TDLS_SETUP_RESPONSE) {
 437		sta = sta_info_get(sdata, peer);
 438		if (WARN_ON_ONCE(!sta))
 439			return;
 440
 441		sta->tdls_chandef = link->conf->chanreq.oper;
 442	}
 443
 444	ieee80211_tdls_add_oper_classes(link, skb);
 445
 446	/*
 447	 * with TDLS we can switch channels, and HT-caps are not necessarily
 448	 * the same on all bands. The specification limits the setup to a
 449	 * single HT-cap, so use the current band for now.
 450	 */
 451	memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
 452
 453	if ((action_code == WLAN_TDLS_SETUP_REQUEST ||
 454	     action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) &&
 455	    ht_cap.ht_supported) {
 456		ieee80211_apply_htcap_overrides(sdata, &ht_cap);
 457
 458		/* disable SMPS in TDLS initiator */
 459		ht_cap.cap |= WLAN_HT_CAP_SM_PS_DISABLED
 460				<< IEEE80211_HT_CAP_SM_PS_SHIFT;
 461
 462		pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
 463		ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap);
 464	} else if (action_code == WLAN_TDLS_SETUP_RESPONSE &&
 465		   ht_cap.ht_supported && sta->sta.deflink.ht_cap.ht_supported) {
 466		/* the peer caps are already intersected with our own */
 467		memcpy(&ht_cap, &sta->sta.deflink.ht_cap, sizeof(ht_cap));
 468
 469		pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
 470		ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap);
 471	}
 472
 473	if (ht_cap.ht_supported &&
 474	    (ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40))
 475		ieee80211_tdls_add_bss_coex_ie(skb);
 476
 477	ieee80211_tdls_add_link_ie(link, skb, peer, initiator);
 478
 479	/* add any custom IEs that go before VHT capabilities */
 480	if (extra_ies_len) {
 481		static const u8 before_vht_cap[] = {
 482			WLAN_EID_SUPP_RATES,
 483			WLAN_EID_COUNTRY,
 484			WLAN_EID_EXT_SUPP_RATES,
 485			WLAN_EID_SUPPORTED_CHANNELS,
 486			WLAN_EID_RSN,
 487			WLAN_EID_EXT_CAPABILITY,
 488			WLAN_EID_QOS_CAPA,
 489			WLAN_EID_FAST_BSS_TRANSITION,
 490			WLAN_EID_TIMEOUT_INTERVAL,
 491			WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 492			WLAN_EID_MULTI_BAND,
 493		};
 494		noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
 495					     before_vht_cap,
 496					     ARRAY_SIZE(before_vht_cap),
 497					     offset);
 498		skb_put_data(skb, extra_ies + offset, noffset - offset);
 499		offset = noffset;
 500	}
 501
 502	/* add AID if VHT, HE or EHT capabilities supported */
 503	memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap));
 504	he_cap = ieee80211_get_he_iftype_cap_vif(sband, &sdata->vif);
 505	eht_cap = ieee80211_get_eht_iftype_cap_vif(sband, &sdata->vif);
 506	if ((vht_cap.vht_supported || he_cap || eht_cap) &&
 507	    (action_code == WLAN_TDLS_SETUP_REQUEST ||
 508	     action_code == WLAN_TDLS_SETUP_RESPONSE))
 509		ieee80211_tdls_add_aid(sdata, skb);
 510
 511	/* build the VHT-cap similarly to the HT-cap */
 512	if ((action_code == WLAN_TDLS_SETUP_REQUEST ||
 513	     action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) &&
 514	    vht_cap.vht_supported) {
 515		ieee80211_apply_vhtcap_overrides(sdata, &vht_cap);
 516
 517		pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
 518		ieee80211_ie_build_vht_cap(pos, &vht_cap, vht_cap.cap);
 519	} else if (action_code == WLAN_TDLS_SETUP_RESPONSE &&
 520		   vht_cap.vht_supported && sta->sta.deflink.vht_cap.vht_supported) {
 521		/* the peer caps are already intersected with our own */
 522		memcpy(&vht_cap, &sta->sta.deflink.vht_cap, sizeof(vht_cap));
 523
 524		pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
 525		ieee80211_ie_build_vht_cap(pos, &vht_cap, vht_cap.cap);
 526
 527		/*
 528		 * if both peers support WIDER_BW, we can expand the chandef to
 529		 * a wider compatible one, up to 80MHz
 530		 */
 531		if (test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW))
 532			ieee80211_tdls_chandef_vht_upgrade(sdata, sta);
 533	}
 534
 535	/* add any custom IEs that go before HE capabilities */
 536	if (extra_ies_len) {
 537		static const u8 before_he_cap[] = {
 538			WLAN_EID_EXTENSION,
 539			WLAN_EID_EXT_FILS_REQ_PARAMS,
 540			WLAN_EID_AP_CSN,
 541		};
 542		noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
 543					     before_he_cap,
 544					     ARRAY_SIZE(before_he_cap),
 545					     offset);
 546		skb_put_data(skb, extra_ies + offset, noffset - offset);
 547		offset = noffset;
 548	}
 549
 550	/* build the HE-cap from sband */
 551	if (action_code == WLAN_TDLS_SETUP_REQUEST ||
 552	    action_code == WLAN_TDLS_SETUP_RESPONSE ||
 553	    action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) {
 554		ieee80211_put_he_cap(skb, sdata, sband, NULL);
 555
 556		/* Build HE 6Ghz capa IE from sband */
 557		if (sband->band == NL80211_BAND_6GHZ)
 558			ieee80211_put_he_6ghz_cap(skb, sdata, link->smps_mode);
 559	}
 560
 561	/* add any custom IEs that go before EHT capabilities */
 562	if (extra_ies_len) {
 563		static const u8 before_he_cap[] = {
 564			WLAN_EID_EXTENSION,
 565			WLAN_EID_EXT_FILS_REQ_PARAMS,
 566			WLAN_EID_AP_CSN,
 567		};
 568
 569		noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
 570					     before_he_cap,
 571					     ARRAY_SIZE(before_he_cap),
 572					     offset);
 573		skb_put_data(skb, extra_ies + offset, noffset - offset);
 574		offset = noffset;
 575	}
 576
 577	/* build the EHT-cap from sband */
 578	if (action_code == WLAN_TDLS_SETUP_REQUEST ||
 579	    action_code == WLAN_TDLS_SETUP_RESPONSE ||
 580	    action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES)
 581		ieee80211_put_eht_cap(skb, sdata, sband, NULL);
 582
 583	/* add any remaining IEs */
 584	if (extra_ies_len) {
 585		noffset = extra_ies_len;
 586		skb_put_data(skb, extra_ies + offset, noffset - offset);
 587	}
 588
 589}
 590
 591static void
 592ieee80211_tdls_add_setup_cfm_ies(struct ieee80211_link_data *link,
 593				 struct sk_buff *skb, const u8 *peer,
 594				 bool initiator, const u8 *extra_ies,
 595				 size_t extra_ies_len)
 596{
 597	struct ieee80211_sub_if_data *sdata = link->sdata;
 598	struct ieee80211_local *local = sdata->local;
 599	size_t offset = 0, noffset;
 600	struct sta_info *sta, *ap_sta;
 601	struct ieee80211_supported_band *sband;
 602	u8 *pos;
 603
 604	sband = ieee80211_get_link_sband(link);
 605	if (WARN_ON_ONCE(!sband))
 606		return;
 607
 608	sta = sta_info_get(sdata, peer);
 609	ap_sta = sta_info_get(sdata, sdata->vif.cfg.ap_addr);
 610
 611	if (WARN_ON_ONCE(!sta || !ap_sta))
 612		return;
 613
 614	sta->tdls_chandef = link->conf->chanreq.oper;
 615
 616	/* add any custom IEs that go before the QoS IE */
 617	if (extra_ies_len) {
 618		static const u8 before_qos[] = {
 619			WLAN_EID_RSN,
 620		};
 621		noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
 622					     before_qos,
 623					     ARRAY_SIZE(before_qos),
 624					     offset);
 625		skb_put_data(skb, extra_ies + offset, noffset - offset);
 626		offset = noffset;
 627	}
 628
 629	/* add the QoS param IE if both the peer and we support it */
 630	if (local->hw.queues >= IEEE80211_NUM_ACS && sta->sta.wme)
 631		ieee80211_tdls_add_wmm_param_ie(sdata, skb);
 632
 633	/* add any custom IEs that go before HT operation */
 634	if (extra_ies_len) {
 635		static const u8 before_ht_op[] = {
 636			WLAN_EID_RSN,
 637			WLAN_EID_QOS_CAPA,
 638			WLAN_EID_FAST_BSS_TRANSITION,
 639			WLAN_EID_TIMEOUT_INTERVAL,
 640		};
 641		noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
 642					     before_ht_op,
 643					     ARRAY_SIZE(before_ht_op),
 644					     offset);
 645		skb_put_data(skb, extra_ies + offset, noffset - offset);
 646		offset = noffset;
 647	}
 648
 649	/*
 650	 * if HT support is only added in TDLS, we need an HT-operation IE.
 651	 * add the IE as required by IEEE802.11-2012 9.23.3.2.
 652	 */
 653	if (!ap_sta->sta.deflink.ht_cap.ht_supported && sta->sta.deflink.ht_cap.ht_supported) {
 654		u16 prot = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED |
 655			   IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT |
 656			   IEEE80211_HT_OP_MODE_NON_HT_STA_PRSNT;
 657
 658		pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_operation));
 659		ieee80211_ie_build_ht_oper(pos, &sta->sta.deflink.ht_cap,
 660					   &link->conf->chanreq.oper, prot,
 661					   true);
 662	}
 663
 664	ieee80211_tdls_add_link_ie(link, skb, peer, initiator);
 665
 666	/* only include VHT-operation if not on the 2.4GHz band */
 667	if (sband->band != NL80211_BAND_2GHZ &&
 668	    sta->sta.deflink.vht_cap.vht_supported) {
 669		/*
 670		 * if both peers support WIDER_BW, we can expand the chandef to
 671		 * a wider compatible one, up to 80MHz
 672		 */
 673		if (test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW))
 674			ieee80211_tdls_chandef_vht_upgrade(sdata, sta);
 675
 676		pos = skb_put(skb, 2 + sizeof(struct ieee80211_vht_operation));
 677		ieee80211_ie_build_vht_oper(pos, &sta->sta.deflink.vht_cap,
 678					    &sta->tdls_chandef);
 679	}
 680
 681	/* add any remaining IEs */
 682	if (extra_ies_len) {
 683		noffset = extra_ies_len;
 684		skb_put_data(skb, extra_ies + offset, noffset - offset);
 685	}
 686}
 687
 688static void
 689ieee80211_tdls_add_chan_switch_req_ies(struct ieee80211_link_data *link,
 690				       struct sk_buff *skb, const u8 *peer,
 691				       bool initiator, const u8 *extra_ies,
 692				       size_t extra_ies_len, u8 oper_class,
 693				       struct cfg80211_chan_def *chandef)
 694{
 695	struct ieee80211_tdls_data *tf;
 696	size_t offset = 0, noffset;
 697
 698	if (WARN_ON_ONCE(!chandef))
 699		return;
 700
 701	tf = (void *)skb->data;
 702	tf->u.chan_switch_req.target_channel =
 703		ieee80211_frequency_to_channel(chandef->chan->center_freq);
 704	tf->u.chan_switch_req.oper_class = oper_class;
 705
 706	if (extra_ies_len) {
 707		static const u8 before_lnkie[] = {
 708			WLAN_EID_SECONDARY_CHANNEL_OFFSET,
 709		};
 710		noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
 711					     before_lnkie,
 712					     ARRAY_SIZE(before_lnkie),
 713					     offset);
 714		skb_put_data(skb, extra_ies + offset, noffset - offset);
 715		offset = noffset;
 716	}
 717
 718	ieee80211_tdls_add_link_ie(link, skb, peer, initiator);
 719
 720	/* add any remaining IEs */
 721	if (extra_ies_len) {
 722		noffset = extra_ies_len;
 723		skb_put_data(skb, extra_ies + offset, noffset - offset);
 724	}
 725}
 726
 727static void
 728ieee80211_tdls_add_chan_switch_resp_ies(struct ieee80211_link_data *link,
 729					struct sk_buff *skb, const u8 *peer,
 730					u16 status_code, bool initiator,
 731					const u8 *extra_ies,
 732					size_t extra_ies_len)
 733{
 734	if (status_code == 0)
 735		ieee80211_tdls_add_link_ie(link, skb, peer, initiator);
 736
 737	if (extra_ies_len)
 738		skb_put_data(skb, extra_ies, extra_ies_len);
 739}
 740
 741static void ieee80211_tdls_add_ies(struct ieee80211_link_data *link,
 742				   struct sk_buff *skb, const u8 *peer,
 743				   u8 action_code, u16 status_code,
 744				   bool initiator, const u8 *extra_ies,
 745				   size_t extra_ies_len, u8 oper_class,
 746				   struct cfg80211_chan_def *chandef)
 747{
 748	switch (action_code) {
 749	case WLAN_TDLS_SETUP_REQUEST:
 750	case WLAN_TDLS_SETUP_RESPONSE:
 751	case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
 752		if (status_code == 0)
 753			ieee80211_tdls_add_setup_start_ies(link,
 754							   skb, peer,
 755							   action_code,
 756							   initiator,
 757							   extra_ies,
 758							   extra_ies_len);
 759		break;
 760	case WLAN_TDLS_SETUP_CONFIRM:
 761		if (status_code == 0)
 762			ieee80211_tdls_add_setup_cfm_ies(link, skb, peer,
 763							 initiator, extra_ies,
 764							 extra_ies_len);
 765		break;
 766	case WLAN_TDLS_TEARDOWN:
 767	case WLAN_TDLS_DISCOVERY_REQUEST:
 768		if (extra_ies_len)
 769			skb_put_data(skb, extra_ies, extra_ies_len);
 770		if (status_code == 0 || action_code == WLAN_TDLS_TEARDOWN)
 771			ieee80211_tdls_add_link_ie(link, skb,
 772						   peer, initiator);
 773		break;
 774	case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
 775		ieee80211_tdls_add_chan_switch_req_ies(link, skb, peer,
 776						       initiator, extra_ies,
 777						       extra_ies_len,
 778						       oper_class, chandef);
 779		break;
 780	case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
 781		ieee80211_tdls_add_chan_switch_resp_ies(link, skb, peer,
 782							status_code,
 783							initiator, extra_ies,
 784							extra_ies_len);
 785		break;
 786	}
 787
 788}
 789
 790static int
 791ieee80211_prep_tdls_encap_data(struct wiphy *wiphy, struct net_device *dev,
 792			       struct ieee80211_link_data *link,
 793			       const u8 *peer, u8 action_code, u8 dialog_token,
 794			       u16 status_code, struct sk_buff *skb)
 795{
 796	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 797	struct ieee80211_tdls_data *tf;
 798
 799	tf = skb_put(skb, offsetof(struct ieee80211_tdls_data, u));
 800
 801	memcpy(tf->da, peer, ETH_ALEN);
 802	memcpy(tf->sa, sdata->vif.addr, ETH_ALEN);
 803	tf->ether_type = cpu_to_be16(ETH_P_TDLS);
 804	tf->payload_type = WLAN_TDLS_SNAP_RFTYPE;
 805
 806	/* network header is after the ethernet header */
 807	skb_set_network_header(skb, ETH_HLEN);
 808
 809	switch (action_code) {
 810	case WLAN_TDLS_SETUP_REQUEST:
 811		tf->category = WLAN_CATEGORY_TDLS;
 812		tf->action_code = WLAN_TDLS_SETUP_REQUEST;
 813
 814		skb_put(skb, sizeof(tf->u.setup_req));
 815		tf->u.setup_req.dialog_token = dialog_token;
 816		tf->u.setup_req.capability =
 817			cpu_to_le16(ieee80211_get_tdls_sta_capab(link,
 818								 status_code));
 819		break;
 820	case WLAN_TDLS_SETUP_RESPONSE:
 821		tf->category = WLAN_CATEGORY_TDLS;
 822		tf->action_code = WLAN_TDLS_SETUP_RESPONSE;
 823
 824		skb_put(skb, sizeof(tf->u.setup_resp));
 825		tf->u.setup_resp.status_code = cpu_to_le16(status_code);
 826		tf->u.setup_resp.dialog_token = dialog_token;
 827		tf->u.setup_resp.capability =
 828			cpu_to_le16(ieee80211_get_tdls_sta_capab(link,
 829								 status_code));
 830		break;
 831	case WLAN_TDLS_SETUP_CONFIRM:
 832		tf->category = WLAN_CATEGORY_TDLS;
 833		tf->action_code = WLAN_TDLS_SETUP_CONFIRM;
 834
 835		skb_put(skb, sizeof(tf->u.setup_cfm));
 836		tf->u.setup_cfm.status_code = cpu_to_le16(status_code);
 837		tf->u.setup_cfm.dialog_token = dialog_token;
 838		break;
 839	case WLAN_TDLS_TEARDOWN:
 840		tf->category = WLAN_CATEGORY_TDLS;
 841		tf->action_code = WLAN_TDLS_TEARDOWN;
 842
 843		skb_put(skb, sizeof(tf->u.teardown));
 844		tf->u.teardown.reason_code = cpu_to_le16(status_code);
 845		break;
 846	case WLAN_TDLS_DISCOVERY_REQUEST:
 847		tf->category = WLAN_CATEGORY_TDLS;
 848		tf->action_code = WLAN_TDLS_DISCOVERY_REQUEST;
 849
 850		skb_put(skb, sizeof(tf->u.discover_req));
 851		tf->u.discover_req.dialog_token = dialog_token;
 852		break;
 853	case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
 854		tf->category = WLAN_CATEGORY_TDLS;
 855		tf->action_code = WLAN_TDLS_CHANNEL_SWITCH_REQUEST;
 856
 857		skb_put(skb, sizeof(tf->u.chan_switch_req));
 858		break;
 859	case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
 860		tf->category = WLAN_CATEGORY_TDLS;
 861		tf->action_code = WLAN_TDLS_CHANNEL_SWITCH_RESPONSE;
 862
 863		skb_put(skb, sizeof(tf->u.chan_switch_resp));
 864		tf->u.chan_switch_resp.status_code = cpu_to_le16(status_code);
 865		break;
 866	default:
 867		return -EINVAL;
 868	}
 869
 870	return 0;
 871}
 872
 873static int
 874ieee80211_prep_tdls_direct(struct wiphy *wiphy, struct net_device *dev,
 875			   const u8 *peer, struct ieee80211_link_data *link,
 876			   u8 action_code, u8 dialog_token,
 877			   u16 status_code, struct sk_buff *skb)
 878{
 879	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 880	struct ieee80211_mgmt *mgmt;
 881
 882	mgmt = skb_put_zero(skb, 24);
 883	memcpy(mgmt->da, peer, ETH_ALEN);
 884	memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 885	memcpy(mgmt->bssid, link->u.mgd.bssid, ETH_ALEN);
 886	mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 887					  IEEE80211_STYPE_ACTION);
 888
 889	switch (action_code) {
 890	case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
 891		skb_put(skb, 1 + sizeof(mgmt->u.action.u.tdls_discover_resp));
 892		mgmt->u.action.category = WLAN_CATEGORY_PUBLIC;
 893		mgmt->u.action.u.tdls_discover_resp.action_code =
 894			WLAN_PUB_ACTION_TDLS_DISCOVER_RES;
 895		mgmt->u.action.u.tdls_discover_resp.dialog_token =
 896			dialog_token;
 897		mgmt->u.action.u.tdls_discover_resp.capability =
 898			cpu_to_le16(ieee80211_get_tdls_sta_capab(link,
 899								 status_code));
 900		break;
 901	default:
 902		return -EINVAL;
 903	}
 904
 905	return 0;
 906}
 907
 908static struct sk_buff *
 909ieee80211_tdls_build_mgmt_packet_data(struct ieee80211_sub_if_data *sdata,
 910				      const u8 *peer, int link_id,
 911				      u8 action_code, u8 dialog_token,
 912				      u16 status_code, bool initiator,
 913				      const u8 *extra_ies, size_t extra_ies_len,
 914				      u8 oper_class,
 915				      struct cfg80211_chan_def *chandef)
 916{
 917	struct ieee80211_local *local = sdata->local;
 918	struct sk_buff *skb;
 919	int ret;
 920	struct ieee80211_link_data *link;
 921
 922	link_id = link_id >= 0 ? link_id : 0;
 923	rcu_read_lock();
 924	link = rcu_dereference(sdata->link[link_id]);
 925	if (WARN_ON(!link))
 926		goto unlock;
 927
 928	skb = netdev_alloc_skb(sdata->dev,
 929			       local->hw.extra_tx_headroom +
 930			       max(sizeof(struct ieee80211_mgmt),
 931				   sizeof(struct ieee80211_tdls_data)) +
 932			       50 + /* supported rates */
 933			       10 + /* ext capab */
 934			       26 + /* max(WMM-info, WMM-param) */
 935			       2 + max(sizeof(struct ieee80211_ht_cap),
 936				       sizeof(struct ieee80211_ht_operation)) +
 937			       2 + max(sizeof(struct ieee80211_vht_cap),
 938				       sizeof(struct ieee80211_vht_operation)) +
 939			       2 + 1 + sizeof(struct ieee80211_he_cap_elem) +
 940				       sizeof(struct ieee80211_he_mcs_nss_supp) +
 941				       IEEE80211_HE_PPE_THRES_MAX_LEN +
 942			       2 + 1 + sizeof(struct ieee80211_he_6ghz_capa) +
 943			       2 + 1 + sizeof(struct ieee80211_eht_cap_elem) +
 944				       sizeof(struct ieee80211_eht_mcs_nss_supp) +
 945				       IEEE80211_EHT_PPE_THRES_MAX_LEN +
 946			       50 + /* supported channels */
 947			       3 + /* 40/20 BSS coex */
 948			       4 + /* AID */
 949			       4 + /* oper classes */
 950			       extra_ies_len +
 951			       sizeof(struct ieee80211_tdls_lnkie));
 952	if (!skb)
 953		goto unlock;
 954
 955	skb_reserve(skb, local->hw.extra_tx_headroom);
 956
 957	switch (action_code) {
 958	case WLAN_TDLS_SETUP_REQUEST:
 959	case WLAN_TDLS_SETUP_RESPONSE:
 960	case WLAN_TDLS_SETUP_CONFIRM:
 961	case WLAN_TDLS_TEARDOWN:
 962	case WLAN_TDLS_DISCOVERY_REQUEST:
 963	case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
 964	case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
 965		ret = ieee80211_prep_tdls_encap_data(local->hw.wiphy,
 966						     sdata->dev, link, peer,
 967						     action_code, dialog_token,
 968						     status_code, skb);
 969		break;
 970	case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
 971		ret = ieee80211_prep_tdls_direct(local->hw.wiphy, sdata->dev,
 972						 peer, link, action_code,
 973						 dialog_token, status_code,
 974						 skb);
 975		break;
 976	default:
 977		ret = -EOPNOTSUPP;
 978		break;
 979	}
 980
 981	if (ret < 0)
 982		goto fail;
 983
 984	ieee80211_tdls_add_ies(link, skb, peer, action_code, status_code,
 985			       initiator, extra_ies, extra_ies_len, oper_class,
 986			       chandef);
 987	rcu_read_unlock();
 988	return skb;
 989
 990fail:
 991	dev_kfree_skb(skb);
 992unlock:
 993	rcu_read_unlock();
 994	return NULL;
 995}
 996
 997static int
 998ieee80211_tdls_prep_mgmt_packet(struct wiphy *wiphy, struct net_device *dev,
 999				const u8 *peer, int link_id,
1000				u8 action_code, u8 dialog_token,
1001				u16 status_code, u32 peer_capability,
1002				bool initiator, const u8 *extra_ies,
1003				size_t extra_ies_len, u8 oper_class,
1004				struct cfg80211_chan_def *chandef)
1005{
1006	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1007	struct sk_buff *skb = NULL;
1008	struct sta_info *sta;
1009	u32 flags = 0;
1010	int ret = 0;
1011
1012	rcu_read_lock();
1013	sta = sta_info_get(sdata, peer);
1014
1015	/* infer the initiator if we can, to support old userspace */
1016	switch (action_code) {
1017	case WLAN_TDLS_SETUP_REQUEST:
1018		if (sta) {
1019			set_sta_flag(sta, WLAN_STA_TDLS_INITIATOR);
1020			sta->sta.tdls_initiator = false;
1021		}
1022		fallthrough;
1023	case WLAN_TDLS_SETUP_CONFIRM:
1024	case WLAN_TDLS_DISCOVERY_REQUEST:
1025		initiator = true;
1026		break;
1027	case WLAN_TDLS_SETUP_RESPONSE:
1028		/*
1029		 * In some testing scenarios, we send a request and response.
1030		 * Make the last packet sent take effect for the initiator
1031		 * value.
1032		 */
1033		if (sta) {
1034			clear_sta_flag(sta, WLAN_STA_TDLS_INITIATOR);
1035			sta->sta.tdls_initiator = true;
1036		}
1037		fallthrough;
1038	case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
1039		initiator = false;
1040		break;
1041	case WLAN_TDLS_TEARDOWN:
1042	case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
1043	case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
1044		/* any value is ok */
1045		break;
1046	default:
1047		ret = -EOPNOTSUPP;
1048		break;
1049	}
1050
1051	if (sta && test_sta_flag(sta, WLAN_STA_TDLS_INITIATOR))
1052		initiator = true;
1053
1054	rcu_read_unlock();
1055	if (ret < 0)
1056		goto fail;
1057
1058	skb = ieee80211_tdls_build_mgmt_packet_data(sdata, peer,
1059						    link_id, action_code,
1060						    dialog_token, status_code,
1061						    initiator, extra_ies,
1062						    extra_ies_len, oper_class,
1063						    chandef);
1064	if (!skb) {
1065		ret = -EINVAL;
1066		goto fail;
1067	}
1068
1069	if (action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) {
1070		ieee80211_tx_skb_tid(sdata, skb, 7, link_id);
1071		return 0;
1072	}
1073
1074	/*
1075	 * According to 802.11z: Setup req/resp are sent in AC_BK, otherwise
1076	 * we should default to AC_VI.
1077	 */
1078	switch (action_code) {
1079	case WLAN_TDLS_SETUP_REQUEST:
1080	case WLAN_TDLS_SETUP_RESPONSE:
1081		skb->priority = 256 + 2;
1082		break;
1083	default:
1084		skb->priority = 256 + 5;
1085		break;
1086	}
1087
1088	/*
1089	 * Set the WLAN_TDLS_TEARDOWN flag to indicate a teardown in progress.
1090	 * Later, if no ACK is returned from peer, we will re-send the teardown
1091	 * packet through the AP.
1092	 */
1093	if ((action_code == WLAN_TDLS_TEARDOWN) &&
1094	    ieee80211_hw_check(&sdata->local->hw, REPORTS_TX_ACK_STATUS)) {
1095		bool try_resend; /* Should we keep skb for possible resend */
1096
1097		/* If not sending directly to peer - no point in keeping skb */
1098		rcu_read_lock();
1099		sta = sta_info_get(sdata, peer);
1100		try_resend = sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
1101		rcu_read_unlock();
1102
1103		spin_lock_bh(&sdata->u.mgd.teardown_lock);
1104		if (try_resend && !sdata->u.mgd.teardown_skb) {
1105			/* Mark it as requiring TX status callback  */
1106			flags |= IEEE80211_TX_CTL_REQ_TX_STATUS |
1107				 IEEE80211_TX_INTFL_MLME_CONN_TX;
1108
1109			/*
1110			 * skb is copied since mac80211 will later set
1111			 * properties that might not be the same as the AP,
1112			 * such as encryption, QoS, addresses, etc.
1113			 *
1114			 * No problem if skb_copy() fails, so no need to check.
1115			 */
1116			sdata->u.mgd.teardown_skb = skb_copy(skb, GFP_ATOMIC);
1117			sdata->u.mgd.orig_teardown_skb = skb;
1118		}
1119		spin_unlock_bh(&sdata->u.mgd.teardown_lock);
1120	}
1121
1122	/* disable bottom halves when entering the Tx path */
1123	local_bh_disable();
1124	__ieee80211_subif_start_xmit(skb, dev, flags,
1125				     IEEE80211_TX_CTRL_MLO_LINK_UNSPEC, NULL);
1126	local_bh_enable();
1127
1128	return ret;
1129
1130fail:
1131	dev_kfree_skb(skb);
1132	return ret;
1133}
1134
1135static int
1136ieee80211_tdls_mgmt_setup(struct wiphy *wiphy, struct net_device *dev,
1137			  const u8 *peer, int link_id,
1138			  u8 action_code, u8 dialog_token,
1139			  u16 status_code, u32 peer_capability, bool initiator,
1140			  const u8 *extra_ies, size_t extra_ies_len)
1141{
1142	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1143	struct ieee80211_local *local = sdata->local;
1144	enum ieee80211_smps_mode smps_mode =
1145		sdata->deflink.u.mgd.driver_smps_mode;
1146	int ret;
1147
1148	/* don't support setup with forced SMPS mode that's not off */
1149	if (smps_mode != IEEE80211_SMPS_AUTOMATIC &&
1150	    smps_mode != IEEE80211_SMPS_OFF) {
1151		tdls_dbg(sdata, "Aborting TDLS setup due to SMPS mode %d\n",
1152			 smps_mode);
1153		return -EOPNOTSUPP;
1154	}
1155
1156	lockdep_assert_wiphy(local->hw.wiphy);
1157
1158	/* we don't support concurrent TDLS peer setups */
1159	if (!is_zero_ether_addr(sdata->u.mgd.tdls_peer) &&
1160	    !ether_addr_equal(sdata->u.mgd.tdls_peer, peer)) {
1161		ret = -EBUSY;
1162		goto out_unlock;
1163	}
1164
1165	/*
1166	 * make sure we have a STA representing the peer so we drop or buffer
1167	 * non-TDLS-setup frames to the peer. We can't send other packets
1168	 * during setup through the AP path.
1169	 * Allow error packets to be sent - sometimes we don't even add a STA
1170	 * before failing the setup.
1171	 */
1172	if (status_code == 0) {
1173		rcu_read_lock();
1174		if (!sta_info_get(sdata, peer)) {
1175			rcu_read_unlock();
1176			ret = -ENOLINK;
1177			goto out_unlock;
1178		}
1179		rcu_read_unlock();
1180	}
1181
1182	ieee80211_flush_queues(local, sdata, false);
1183	memcpy(sdata->u.mgd.tdls_peer, peer, ETH_ALEN);
1184
1185	/* we cannot take the mutex while preparing the setup packet */
1186	ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer,
1187					      link_id, action_code,
1188					      dialog_token, status_code,
1189					      peer_capability, initiator,
1190					      extra_ies, extra_ies_len, 0,
1191					      NULL);
1192	if (ret < 0) {
1193		eth_zero_addr(sdata->u.mgd.tdls_peer);
1194		return ret;
1195	}
1196
1197	wiphy_delayed_work_queue(sdata->local->hw.wiphy,
1198				 &sdata->u.mgd.tdls_peer_del_work,
1199				 TDLS_PEER_SETUP_TIMEOUT);
1200	return 0;
1201
1202out_unlock:
1203	return ret;
1204}
1205
1206static int
1207ieee80211_tdls_mgmt_teardown(struct wiphy *wiphy, struct net_device *dev,
1208			     const u8 *peer, int link_id,
1209			     u8 action_code, u8 dialog_token,
1210			     u16 status_code, u32 peer_capability,
1211			     bool initiator, const u8 *extra_ies,
1212			     size_t extra_ies_len)
1213{
1214	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1215	struct ieee80211_local *local = sdata->local;
1216	struct sta_info *sta;
1217	int ret;
1218
1219	/*
1220	 * No packets can be transmitted to the peer via the AP during setup -
1221	 * the STA is set as a TDLS peer, but is not authorized.
1222	 * During teardown, we prevent direct transmissions by stopping the
1223	 * queues and flushing all direct packets.
1224	 */
1225	ieee80211_stop_vif_queues(local, sdata,
1226				  IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN);
1227	ieee80211_flush_queues(local, sdata, false);
1228
1229	ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer,
1230					      link_id, action_code,
1231					      dialog_token, status_code,
1232					      peer_capability, initiator,
1233					      extra_ies, extra_ies_len, 0,
1234					      NULL);
1235	if (ret < 0)
1236		sdata_err(sdata, "Failed sending TDLS teardown packet %d\n",
1237			  ret);
1238
1239	/*
1240	 * Remove the STA AUTH flag to force further traffic through the AP. If
1241	 * the STA was unreachable, it was already removed.
1242	 */
1243	rcu_read_lock();
1244	sta = sta_info_get(sdata, peer);
1245	if (sta)
1246		clear_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
1247	rcu_read_unlock();
1248
1249	ieee80211_wake_vif_queues(local, sdata,
1250				  IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN);
1251
1252	return 0;
1253}
1254
1255int ieee80211_tdls_mgmt(struct wiphy *wiphy, struct net_device *dev,
1256			const u8 *peer, int link_id,
1257			u8 action_code, u8 dialog_token, u16 status_code,
1258			u32 peer_capability, bool initiator,
1259			const u8 *extra_ies, size_t extra_ies_len)
1260{
1261	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1262	int ret;
1263
1264	if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS))
1265		return -EOPNOTSUPP;
1266
1267	/* make sure we are in managed mode, and associated */
1268	if (sdata->vif.type != NL80211_IFTYPE_STATION ||
1269	    !sdata->u.mgd.associated)
1270		return -EINVAL;
1271
1272	switch (action_code) {
1273	case WLAN_TDLS_SETUP_REQUEST:
1274	case WLAN_TDLS_SETUP_RESPONSE:
1275		ret = ieee80211_tdls_mgmt_setup(wiphy, dev, peer,
1276						link_id, action_code,
1277						dialog_token, status_code,
1278						peer_capability, initiator,
1279						extra_ies, extra_ies_len);
1280		break;
1281	case WLAN_TDLS_TEARDOWN:
1282		ret = ieee80211_tdls_mgmt_teardown(wiphy, dev, peer, link_id,
1283						   action_code, dialog_token,
1284						   status_code,
1285						   peer_capability, initiator,
1286						   extra_ies, extra_ies_len);
1287		break;
1288	case WLAN_TDLS_DISCOVERY_REQUEST:
1289		/*
1290		 * Protect the discovery so we can hear the TDLS discovery
1291		 * response frame. It is transmitted directly and not buffered
1292		 * by the AP.
1293		 */
1294		drv_mgd_protect_tdls_discover(sdata->local, sdata, link_id);
1295		fallthrough;
1296	case WLAN_TDLS_SETUP_CONFIRM:
1297	case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
1298		/* no special handling */
1299		ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer,
1300						      link_id, action_code,
1301						      dialog_token,
1302						      status_code,
1303						      peer_capability,
1304						      initiator, extra_ies,
1305						      extra_ies_len, 0, NULL);
1306		break;
1307	default:
1308		ret = -EOPNOTSUPP;
1309		break;
1310	}
1311
1312	tdls_dbg(sdata, "TDLS mgmt action %d peer %pM link_id %d status %d\n",
1313		 action_code, peer, link_id, ret);
1314	return ret;
1315}
1316
1317static void iee80211_tdls_recalc_chanctx(struct ieee80211_sub_if_data *sdata,
1318					 struct sta_info *sta)
1319{
1320	struct ieee80211_local *local = sdata->local;
1321	struct ieee80211_chanctx_conf *conf;
1322	struct ieee80211_chanctx *ctx;
1323	enum nl80211_chan_width width;
1324	struct ieee80211_supported_band *sband;
1325
1326	lockdep_assert_wiphy(local->hw.wiphy);
1327
1328	conf = rcu_dereference_protected(sdata->vif.bss_conf.chanctx_conf,
1329					 lockdep_is_held(&local->hw.wiphy->mtx));
1330	if (conf) {
1331		width = conf->def.width;
1332		sband = local->hw.wiphy->bands[conf->def.chan->band];
1333		ctx = container_of(conf, struct ieee80211_chanctx, conf);
1334		ieee80211_recalc_chanctx_chantype(local, ctx);
1335
1336		/* if width changed and a peer is given, update its BW */
1337		if (width != conf->def.width && sta &&
1338		    test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW)) {
1339			enum ieee80211_sta_rx_bandwidth bw;
1340
1341			bw = ieee80211_chan_width_to_rx_bw(conf->def.width);
1342			bw = min(bw, ieee80211_sta_cap_rx_bw(&sta->deflink));
1343			if (bw != sta->sta.deflink.bandwidth) {
1344				sta->sta.deflink.bandwidth = bw;
1345				rate_control_rate_update(local, sband,
1346							 &sta->deflink,
1347							 IEEE80211_RC_BW_CHANGED);
1348				/*
1349				 * if a TDLS peer BW was updated, we need to
1350				 * recalc the chandef width again, to get the
1351				 * correct chanctx min_def
1352				 */
1353				ieee80211_recalc_chanctx_chantype(local, ctx);
1354			}
1355		}
1356
1357	}
1358}
1359
1360static int iee80211_tdls_have_ht_peers(struct ieee80211_sub_if_data *sdata)
1361{
1362	struct sta_info *sta;
1363	bool result = false;
1364
1365	rcu_read_lock();
1366	list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) {
1367		if (!sta->sta.tdls || sta->sdata != sdata || !sta->uploaded ||
1368		    !test_sta_flag(sta, WLAN_STA_AUTHORIZED) ||
1369		    !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH) ||
1370		    !sta->sta.deflink.ht_cap.ht_supported)
1371			continue;
1372		result = true;
1373		break;
1374	}
1375	rcu_read_unlock();
1376
1377	return result;
1378}
1379
1380static void
1381iee80211_tdls_recalc_ht_protection(struct ieee80211_sub_if_data *sdata,
1382				   struct sta_info *sta)
1383{
1384	bool tdls_ht;
1385	u16 protection = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED |
1386			 IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT |
1387			 IEEE80211_HT_OP_MODE_NON_HT_STA_PRSNT;
1388	u16 opmode;
1389
1390	/* Nothing to do if the BSS connection uses (at least) HT */
1391	if (sdata->deflink.u.mgd.conn.mode >= IEEE80211_CONN_MODE_HT)
1392		return;
1393
1394	tdls_ht = (sta && sta->sta.deflink.ht_cap.ht_supported) ||
1395		  iee80211_tdls_have_ht_peers(sdata);
1396
1397	opmode = sdata->vif.bss_conf.ht_operation_mode;
1398
1399	if (tdls_ht)
1400		opmode |= protection;
1401	else
1402		opmode &= ~protection;
1403
1404	if (opmode == sdata->vif.bss_conf.ht_operation_mode)
1405		return;
1406
1407	sdata->vif.bss_conf.ht_operation_mode = opmode;
1408	ieee80211_link_info_change_notify(sdata, &sdata->deflink,
1409					  BSS_CHANGED_HT);
1410}
1411
1412int ieee80211_tdls_oper(struct wiphy *wiphy, struct net_device *dev,
1413			const u8 *peer, enum nl80211_tdls_operation oper)
1414{
1415	struct sta_info *sta;
1416	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1417	struct ieee80211_local *local = sdata->local;
1418	int ret;
1419
1420	lockdep_assert_wiphy(local->hw.wiphy);
1421
1422	if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS))
1423		return -EOPNOTSUPP;
1424
1425	if (sdata->vif.type != NL80211_IFTYPE_STATION || !sdata->vif.cfg.assoc)
1426		return -EINVAL;
1427
1428	switch (oper) {
1429	case NL80211_TDLS_ENABLE_LINK:
1430	case NL80211_TDLS_DISABLE_LINK:
1431		break;
1432	case NL80211_TDLS_TEARDOWN:
1433	case NL80211_TDLS_SETUP:
1434	case NL80211_TDLS_DISCOVERY_REQ:
1435		/* We don't support in-driver setup/teardown/discovery */
1436		return -EOPNOTSUPP;
1437	}
1438
1439	/* protect possible bss_conf changes and avoid concurrency in
1440	 * ieee80211_bss_info_change_notify()
1441	 */
1442	tdls_dbg(sdata, "TDLS oper %d peer %pM\n", oper, peer);
1443
1444	switch (oper) {
1445	case NL80211_TDLS_ENABLE_LINK:
1446		if (sdata->vif.bss_conf.csa_active) {
1447			tdls_dbg(sdata, "TDLS: disallow link during CSA\n");
1448			return -EBUSY;
1449		}
1450
1451		sta = sta_info_get(sdata, peer);
1452		if (!sta || !sta->sta.tdls)
1453			return -ENOLINK;
1454
1455		iee80211_tdls_recalc_chanctx(sdata, sta);
1456		iee80211_tdls_recalc_ht_protection(sdata, sta);
1457
1458		set_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
1459
1460		WARN_ON_ONCE(is_zero_ether_addr(sdata->u.mgd.tdls_peer) ||
1461			     !ether_addr_equal(sdata->u.mgd.tdls_peer, peer));
1462		break;
1463	case NL80211_TDLS_DISABLE_LINK:
1464		/*
1465		 * The teardown message in ieee80211_tdls_mgmt_teardown() was
1466		 * created while the queues were stopped, so it might still be
1467		 * pending. Before flushing the queues we need to be sure the
1468		 * message is handled by the tasklet handling pending messages,
1469		 * otherwise we might start destroying the station before
1470		 * sending the teardown packet.
1471		 * Note that this only forces the tasklet to flush pendings -
1472		 * not to stop the tasklet from rescheduling itself.
1473		 */
1474		tasklet_kill(&local->tx_pending_tasklet);
1475		/* flush a potentially queued teardown packet */
1476		ieee80211_flush_queues(local, sdata, false);
1477
1478		ret = sta_info_destroy_addr(sdata, peer);
1479
1480		iee80211_tdls_recalc_ht_protection(sdata, NULL);
1481
1482		iee80211_tdls_recalc_chanctx(sdata, NULL);
1483		if (ret)
1484			return ret;
1485		break;
1486	default:
1487		return -EOPNOTSUPP;
1488	}
1489
1490	if (ether_addr_equal(sdata->u.mgd.tdls_peer, peer)) {
1491		wiphy_delayed_work_cancel(sdata->local->hw.wiphy,
1492					  &sdata->u.mgd.tdls_peer_del_work);
1493		eth_zero_addr(sdata->u.mgd.tdls_peer);
1494	}
1495
1496	wiphy_work_queue(sdata->local->hw.wiphy,
1497			 &sdata->deflink.u.mgd.request_smps_work);
1498
1499	return 0;
1500}
1501
1502void ieee80211_tdls_oper_request(struct ieee80211_vif *vif, const u8 *peer,
1503				 enum nl80211_tdls_operation oper,
1504				 u16 reason_code, gfp_t gfp)
1505{
1506	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1507
1508	if (vif->type != NL80211_IFTYPE_STATION || !vif->cfg.assoc) {
1509		sdata_err(sdata, "Discarding TDLS oper %d - not STA or disconnected\n",
1510			  oper);
1511		return;
1512	}
1513
1514	cfg80211_tdls_oper_request(sdata->dev, peer, oper, reason_code, gfp);
1515}
1516EXPORT_SYMBOL(ieee80211_tdls_oper_request);
1517
1518static void
1519iee80211_tdls_add_ch_switch_timing(u8 *buf, u16 switch_time, u16 switch_timeout)
1520{
1521	struct ieee80211_ch_switch_timing *ch_sw;
1522
1523	*buf++ = WLAN_EID_CHAN_SWITCH_TIMING;
1524	*buf++ = sizeof(struct ieee80211_ch_switch_timing);
1525
1526	ch_sw = (void *)buf;
1527	ch_sw->switch_time = cpu_to_le16(switch_time);
1528	ch_sw->switch_timeout = cpu_to_le16(switch_timeout);
1529}
1530
1531/* find switch timing IE in SKB ready for Tx */
1532static const u8 *ieee80211_tdls_find_sw_timing_ie(struct sk_buff *skb)
1533{
1534	struct ieee80211_tdls_data *tf;
1535	const u8 *ie_start;
1536
1537	/*
1538	 * Get the offset for the new location of the switch timing IE.
1539	 * The SKB network header will now point to the "payload_type"
1540	 * element of the TDLS data frame struct.
1541	 */
1542	tf = container_of(skb->data + skb_network_offset(skb),
1543			  struct ieee80211_tdls_data, payload_type);
1544	ie_start = tf->u.chan_switch_req.variable;
1545	return cfg80211_find_ie(WLAN_EID_CHAN_SWITCH_TIMING, ie_start,
1546				skb->len - (ie_start - skb->data));
1547}
1548
1549static struct sk_buff *
1550ieee80211_tdls_ch_sw_tmpl_get(struct sta_info *sta, u8 oper_class,
1551			      struct cfg80211_chan_def *chandef,
1552			      u32 *ch_sw_tm_ie_offset)
1553{
1554	struct ieee80211_sub_if_data *sdata = sta->sdata;
1555	u8 extra_ies[2 + sizeof(struct ieee80211_sec_chan_offs_ie) +
1556		     2 + sizeof(struct ieee80211_ch_switch_timing)];
1557	int extra_ies_len = 2 + sizeof(struct ieee80211_ch_switch_timing);
1558	u8 *pos = extra_ies;
1559	struct sk_buff *skb;
1560	int link_id = sta->sta.valid_links ? ffs(sta->sta.valid_links) - 1 : 0;
1561
1562	/*
1563	 * if chandef points to a wide channel add a Secondary-Channel
1564	 * Offset information element
1565	 */
1566	if (chandef->width == NL80211_CHAN_WIDTH_40) {
1567		struct ieee80211_sec_chan_offs_ie *sec_chan_ie;
1568		bool ht40plus;
1569
1570		*pos++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET;
1571		*pos++ = sizeof(*sec_chan_ie);
1572		sec_chan_ie = (void *)pos;
1573
1574		ht40plus = cfg80211_get_chandef_type(chandef) ==
1575							NL80211_CHAN_HT40PLUS;
1576		sec_chan_ie->sec_chan_offs = ht40plus ?
1577					     IEEE80211_HT_PARAM_CHA_SEC_ABOVE :
1578					     IEEE80211_HT_PARAM_CHA_SEC_BELOW;
1579		pos += sizeof(*sec_chan_ie);
1580
1581		extra_ies_len += 2 + sizeof(struct ieee80211_sec_chan_offs_ie);
1582	}
1583
1584	/* just set the values to 0, this is a template */
1585	iee80211_tdls_add_ch_switch_timing(pos, 0, 0);
1586
1587	skb = ieee80211_tdls_build_mgmt_packet_data(sdata, sta->sta.addr,
1588					      link_id,
1589					      WLAN_TDLS_CHANNEL_SWITCH_REQUEST,
1590					      0, 0, !sta->sta.tdls_initiator,
1591					      extra_ies, extra_ies_len,
1592					      oper_class, chandef);
1593	if (!skb)
1594		return NULL;
1595
1596	skb = ieee80211_build_data_template(sdata, skb, 0);
1597	if (IS_ERR(skb)) {
1598		tdls_dbg(sdata, "Failed building TDLS channel switch frame\n");
1599		return NULL;
1600	}
1601
1602	if (ch_sw_tm_ie_offset) {
1603		const u8 *tm_ie = ieee80211_tdls_find_sw_timing_ie(skb);
1604
1605		if (!tm_ie) {
1606			tdls_dbg(sdata, "No switch timing IE in TDLS switch\n");
1607			dev_kfree_skb_any(skb);
1608			return NULL;
1609		}
1610
1611		*ch_sw_tm_ie_offset = tm_ie - skb->data;
1612	}
1613
1614	tdls_dbg(sdata,
1615		 "TDLS channel switch request template for %pM ch %d width %d\n",
1616		 sta->sta.addr, chandef->chan->center_freq, chandef->width);
1617	return skb;
1618}
1619
1620int
1621ieee80211_tdls_channel_switch(struct wiphy *wiphy, struct net_device *dev,
1622			      const u8 *addr, u8 oper_class,
1623			      struct cfg80211_chan_def *chandef)
1624{
1625	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1626	struct ieee80211_local *local = sdata->local;
1627	struct sta_info *sta;
1628	struct sk_buff *skb = NULL;
1629	u32 ch_sw_tm_ie;
1630	int ret;
1631
1632	lockdep_assert_wiphy(local->hw.wiphy);
1633
1634	if (chandef->chan->freq_offset)
1635		/* this may work, but is untested */
1636		return -EOPNOTSUPP;
1637
1638	sta = sta_info_get(sdata, addr);
1639	if (!sta) {
1640		tdls_dbg(sdata,
1641			 "Invalid TDLS peer %pM for channel switch request\n",
1642			 addr);
1643		ret = -ENOENT;
1644		goto out;
1645	}
1646
1647	if (!test_sta_flag(sta, WLAN_STA_TDLS_CHAN_SWITCH)) {
1648		tdls_dbg(sdata, "TDLS channel switch unsupported by %pM\n",
1649			 addr);
1650		ret = -EOPNOTSUPP;
1651		goto out;
1652	}
1653
1654	skb = ieee80211_tdls_ch_sw_tmpl_get(sta, oper_class, chandef,
1655					    &ch_sw_tm_ie);
1656	if (!skb) {
1657		ret = -ENOENT;
1658		goto out;
1659	}
1660
1661	ret = drv_tdls_channel_switch(local, sdata, &sta->sta, oper_class,
1662				      chandef, skb, ch_sw_tm_ie);
1663	if (!ret)
1664		set_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL);
1665
1666out:
1667	dev_kfree_skb_any(skb);
1668	return ret;
1669}
1670
1671void
1672ieee80211_tdls_cancel_channel_switch(struct wiphy *wiphy,
1673				     struct net_device *dev,
1674				     const u8 *addr)
1675{
1676	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1677	struct ieee80211_local *local = sdata->local;
1678	struct sta_info *sta;
1679
1680	lockdep_assert_wiphy(local->hw.wiphy);
1681
1682	sta = sta_info_get(sdata, addr);
1683	if (!sta) {
1684		tdls_dbg(sdata,
1685			 "Invalid TDLS peer %pM for channel switch cancel\n",
1686			 addr);
1687		return;
1688	}
1689
1690	if (!test_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL)) {
1691		tdls_dbg(sdata, "TDLS channel switch not initiated by %pM\n",
1692			 addr);
1693		return;
1694	}
1695
1696	drv_tdls_cancel_channel_switch(local, sdata, &sta->sta);
1697	clear_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL);
1698}
1699
1700static struct sk_buff *
1701ieee80211_tdls_ch_sw_resp_tmpl_get(struct sta_info *sta,
1702				   u32 *ch_sw_tm_ie_offset)
1703{
1704	struct ieee80211_sub_if_data *sdata = sta->sdata;
1705	struct sk_buff *skb;
1706	u8 extra_ies[2 + sizeof(struct ieee80211_ch_switch_timing)];
1707	int link_id = sta->sta.valid_links ? ffs(sta->sta.valid_links) - 1 : 0;
1708
1709	/* initial timing are always zero in the template */
1710	iee80211_tdls_add_ch_switch_timing(extra_ies, 0, 0);
1711
1712	skb = ieee80211_tdls_build_mgmt_packet_data(sdata, sta->sta.addr,
1713					link_id,
1714					WLAN_TDLS_CHANNEL_SWITCH_RESPONSE,
1715					0, 0, !sta->sta.tdls_initiator,
1716					extra_ies, sizeof(extra_ies), 0, NULL);
1717	if (!skb)
1718		return NULL;
1719
1720	skb = ieee80211_build_data_template(sdata, skb, 0);
1721	if (IS_ERR(skb)) {
1722		tdls_dbg(sdata,
1723			 "Failed building TDLS channel switch resp frame\n");
1724		return NULL;
1725	}
1726
1727	if (ch_sw_tm_ie_offset) {
1728		const u8 *tm_ie = ieee80211_tdls_find_sw_timing_ie(skb);
1729
1730		if (!tm_ie) {
1731			tdls_dbg(sdata,
1732				 "No switch timing IE in TDLS switch resp\n");
1733			dev_kfree_skb_any(skb);
1734			return NULL;
1735		}
1736
1737		*ch_sw_tm_ie_offset = tm_ie - skb->data;
1738	}
1739
1740	tdls_dbg(sdata, "TDLS get channel switch response template for %pM\n",
1741		 sta->sta.addr);
1742	return skb;
1743}
1744
1745static int
1746ieee80211_process_tdls_channel_switch_resp(struct ieee80211_sub_if_data *sdata,
1747					   struct sk_buff *skb)
1748{
1749	struct ieee80211_local *local = sdata->local;
1750	struct ieee802_11_elems *elems = NULL;
1751	struct sta_info *sta;
1752	struct ieee80211_tdls_data *tf = (void *)skb->data;
1753	bool local_initiator;
1754	struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb);
1755	int baselen = offsetof(typeof(*tf), u.chan_switch_resp.variable);
1756	struct ieee80211_tdls_ch_sw_params params = {};
1757	int ret;
1758
1759	lockdep_assert_wiphy(local->hw.wiphy);
1760
1761	params.action_code = WLAN_TDLS_CHANNEL_SWITCH_RESPONSE;
1762	params.timestamp = rx_status->device_timestamp;
1763
1764	if (skb->len < baselen) {
1765		tdls_dbg(sdata, "TDLS channel switch resp too short: %d\n",
1766			 skb->len);
1767		return -EINVAL;
1768	}
1769
1770	sta = sta_info_get(sdata, tf->sa);
1771	if (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) {
1772		tdls_dbg(sdata, "TDLS chan switch from non-peer sta %pM\n",
1773			 tf->sa);
1774		ret = -EINVAL;
1775		goto out;
1776	}
1777
1778	params.sta = &sta->sta;
1779	params.status = le16_to_cpu(tf->u.chan_switch_resp.status_code);
1780	if (params.status != 0) {
1781		ret = 0;
1782		goto call_drv;
1783	}
1784
1785	elems = ieee802_11_parse_elems(tf->u.chan_switch_resp.variable,
1786				       skb->len - baselen,
1787				       IEEE80211_FTYPE_MGMT |
1788				       IEEE80211_STYPE_ACTION,
1789				       NULL);
1790	if (!elems) {
1791		ret = -ENOMEM;
1792		goto out;
1793	}
1794
1795	if (elems->parse_error) {
1796		tdls_dbg(sdata, "Invalid IEs in TDLS channel switch resp\n");
1797		ret = -EINVAL;
1798		goto out;
1799	}
1800
1801	if (!elems->ch_sw_timing || !elems->lnk_id) {
1802		tdls_dbg(sdata, "TDLS channel switch resp - missing IEs\n");
1803		ret = -EINVAL;
1804		goto out;
1805	}
1806
1807	/* validate the initiator is set correctly */
1808	local_initiator =
1809		!memcmp(elems->lnk_id->init_sta, sdata->vif.addr, ETH_ALEN);
1810	if (local_initiator == sta->sta.tdls_initiator) {
1811		tdls_dbg(sdata, "TDLS chan switch invalid lnk-id initiator\n");
1812		ret = -EINVAL;
1813		goto out;
1814	}
1815
1816	params.switch_time = le16_to_cpu(elems->ch_sw_timing->switch_time);
1817	params.switch_timeout = le16_to_cpu(elems->ch_sw_timing->switch_timeout);
1818
1819	params.tmpl_skb =
1820		ieee80211_tdls_ch_sw_resp_tmpl_get(sta, &params.ch_sw_tm_ie);
1821	if (!params.tmpl_skb) {
1822		ret = -ENOENT;
1823		goto out;
1824	}
1825
1826	ret = 0;
1827call_drv:
1828	drv_tdls_recv_channel_switch(sdata->local, sdata, &params);
1829
1830	tdls_dbg(sdata,
1831		 "TDLS channel switch response received from %pM status %d\n",
1832		 tf->sa, params.status);
1833
1834out:
1835	dev_kfree_skb_any(params.tmpl_skb);
1836	kfree(elems);
1837	return ret;
1838}
1839
1840static int
1841ieee80211_process_tdls_channel_switch_req(struct ieee80211_sub_if_data *sdata,
1842					  struct sk_buff *skb)
1843{
1844	struct ieee80211_local *local = sdata->local;
1845	struct ieee802_11_elems *elems;
1846	struct cfg80211_chan_def chandef;
1847	struct ieee80211_channel *chan;
1848	enum nl80211_channel_type chan_type;
1849	int freq;
1850	u8 target_channel, oper_class;
1851	bool local_initiator;
1852	struct sta_info *sta;
1853	enum nl80211_band band;
1854	struct ieee80211_tdls_data *tf = (void *)skb->data;
1855	struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb);
1856	int baselen = offsetof(typeof(*tf), u.chan_switch_req.variable);
1857	struct ieee80211_tdls_ch_sw_params params = {};
1858	int ret = 0;
1859
1860	lockdep_assert_wiphy(local->hw.wiphy);
1861
1862	params.action_code = WLAN_TDLS_CHANNEL_SWITCH_REQUEST;
1863	params.timestamp = rx_status->device_timestamp;
1864
1865	if (skb->len < baselen) {
1866		tdls_dbg(sdata, "TDLS channel switch req too short: %d\n",
1867			 skb->len);
1868		return -EINVAL;
1869	}
1870
1871	target_channel = tf->u.chan_switch_req.target_channel;
1872	oper_class = tf->u.chan_switch_req.oper_class;
1873
1874	/*
1875	 * We can't easily infer the channel band. The operating class is
1876	 * ambiguous - there are multiple tables (US/Europe/JP/Global). The
1877	 * solution here is to treat channels with number >14 as 5GHz ones,
1878	 * and specifically check for the (oper_class, channel) combinations
1879	 * where this doesn't hold. These are thankfully unique according to
1880	 * IEEE802.11-2012.
1881	 * We consider only the 2GHz and 5GHz bands and 20MHz+ channels as
1882	 * valid here.
1883	 */
1884	if ((oper_class == 112 || oper_class == 2 || oper_class == 3 ||
1885	     oper_class == 4 || oper_class == 5 || oper_class == 6) &&
1886	     target_channel < 14)
1887		band = NL80211_BAND_5GHZ;
1888	else
1889		band = target_channel < 14 ? NL80211_BAND_2GHZ :
1890					     NL80211_BAND_5GHZ;
1891
1892	freq = ieee80211_channel_to_frequency(target_channel, band);
1893	if (freq == 0) {
1894		tdls_dbg(sdata, "Invalid channel in TDLS chan switch: %d\n",
1895			 target_channel);
1896		return -EINVAL;
1897	}
1898
1899	chan = ieee80211_get_channel(sdata->local->hw.wiphy, freq);
1900	if (!chan) {
1901		tdls_dbg(sdata,
1902			 "Unsupported channel for TDLS chan switch: %d\n",
1903			 target_channel);
1904		return -EINVAL;
1905	}
1906
1907	elems = ieee802_11_parse_elems(tf->u.chan_switch_req.variable,
1908				       skb->len - baselen,
1909				       IEEE80211_FTYPE_MGMT |
1910				       IEEE80211_STYPE_ACTION,
1911				       NULL);
1912	if (!elems)
1913		return -ENOMEM;
1914
1915	if (elems->parse_error) {
1916		tdls_dbg(sdata, "Invalid IEs in TDLS channel switch req\n");
1917		ret = -EINVAL;
1918		goto free;
1919	}
1920
1921	if (!elems->ch_sw_timing || !elems->lnk_id) {
1922		tdls_dbg(sdata, "TDLS channel switch req - missing IEs\n");
1923		ret = -EINVAL;
1924		goto free;
1925	}
1926
1927	if (!elems->sec_chan_offs) {
1928		chan_type = NL80211_CHAN_HT20;
1929	} else {
1930		switch (elems->sec_chan_offs->sec_chan_offs) {
1931		case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
1932			chan_type = NL80211_CHAN_HT40PLUS;
1933			break;
1934		case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
1935			chan_type = NL80211_CHAN_HT40MINUS;
1936			break;
1937		default:
1938			chan_type = NL80211_CHAN_HT20;
1939			break;
1940		}
1941	}
1942
1943	cfg80211_chandef_create(&chandef, chan, chan_type);
1944
1945	/* we will be active on the TDLS link */
1946	if (!cfg80211_reg_can_beacon_relax(sdata->local->hw.wiphy, &chandef,
1947					   sdata->wdev.iftype)) {
1948		tdls_dbg(sdata, "TDLS chan switch to forbidden channel\n");
1949		ret = -EINVAL;
1950		goto free;
1951	}
1952
1953	sta = sta_info_get(sdata, tf->sa);
1954	if (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) {
1955		tdls_dbg(sdata, "TDLS chan switch from non-peer sta %pM\n",
1956			 tf->sa);
1957		ret = -EINVAL;
1958		goto out;
1959	}
1960
1961	params.sta = &sta->sta;
1962
1963	/* validate the initiator is set correctly */
1964	local_initiator =
1965		!memcmp(elems->lnk_id->init_sta, sdata->vif.addr, ETH_ALEN);
1966	if (local_initiator == sta->sta.tdls_initiator) {
1967		tdls_dbg(sdata, "TDLS chan switch invalid lnk-id initiator\n");
1968		ret = -EINVAL;
1969		goto out;
1970	}
1971
1972	/* peer should have known better */
1973	if (!sta->sta.deflink.ht_cap.ht_supported && elems->sec_chan_offs &&
1974	    elems->sec_chan_offs->sec_chan_offs) {
1975		tdls_dbg(sdata, "TDLS chan switch - wide chan unsupported\n");
1976		ret = -EOPNOTSUPP;
1977		goto out;
1978	}
1979
1980	params.chandef = &chandef;
1981	params.switch_time = le16_to_cpu(elems->ch_sw_timing->switch_time);
1982	params.switch_timeout = le16_to_cpu(elems->ch_sw_timing->switch_timeout);
1983
1984	params.tmpl_skb =
1985		ieee80211_tdls_ch_sw_resp_tmpl_get(sta,
1986						   &params.ch_sw_tm_ie);
1987	if (!params.tmpl_skb) {
1988		ret = -ENOENT;
1989		goto out;
1990	}
1991
1992	drv_tdls_recv_channel_switch(sdata->local, sdata, &params);
1993
1994	tdls_dbg(sdata,
1995		 "TDLS ch switch request received from %pM ch %d width %d\n",
1996		 tf->sa, params.chandef->chan->center_freq,
1997		 params.chandef->width);
1998out:
1999	dev_kfree_skb_any(params.tmpl_skb);
2000free:
2001	kfree(elems);
2002	return ret;
2003}
2004
2005void
2006ieee80211_process_tdls_channel_switch(struct ieee80211_sub_if_data *sdata,
2007				      struct sk_buff *skb)
2008{
2009	struct ieee80211_tdls_data *tf = (void *)skb->data;
2010	struct wiphy *wiphy = sdata->local->hw.wiphy;
2011
2012	lockdep_assert_wiphy(wiphy);
2013
2014	/* make sure the driver supports it */
2015	if (!(wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH))
2016		return;
2017
2018	/* we want to access the entire packet */
2019	if (skb_linearize(skb))
2020		return;
2021	/*
2022	 * The packet/size was already validated by mac80211 Rx path, only look
2023	 * at the action type.
2024	 */
2025	switch (tf->action_code) {
2026	case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
2027		ieee80211_process_tdls_channel_switch_req(sdata, skb);
2028		break;
2029	case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
2030		ieee80211_process_tdls_channel_switch_resp(sdata, skb);
2031		break;
2032	default:
2033		WARN_ON_ONCE(1);
2034		return;
2035	}
2036}
2037
2038void ieee80211_teardown_tdls_peers(struct ieee80211_link_data *link)
2039{
2040	struct ieee80211_sub_if_data *sdata = link->sdata;
2041	struct sta_info *sta;
2042	u16 reason = WLAN_REASON_TDLS_TEARDOWN_UNSPECIFIED;
2043
2044	rcu_read_lock();
2045	list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) {
2046		if (!sta->sta.tdls || sta->sdata != sdata || !sta->uploaded ||
2047		    !test_sta_flag(sta, WLAN_STA_AUTHORIZED))
2048			continue;
2049
2050		if (sta->deflink.link_id != link->link_id)
2051			continue;
2052
2053		ieee80211_tdls_oper_request(&sdata->vif, sta->sta.addr,
2054					    NL80211_TDLS_TEARDOWN, reason,
2055					    GFP_ATOMIC);
2056	}
2057	rcu_read_unlock();
2058}
2059
2060void ieee80211_tdls_handle_disconnect(struct ieee80211_sub_if_data *sdata,
2061				      const u8 *peer, u16 reason)
2062{
2063	struct ieee80211_sta *sta;
2064
2065	rcu_read_lock();
2066	sta = ieee80211_find_sta(&sdata->vif, peer);
2067	if (!sta || !sta->tdls) {
2068		rcu_read_unlock();
2069		return;
2070	}
2071	rcu_read_unlock();
2072
2073	tdls_dbg(sdata, "disconnected from TDLS peer %pM (Reason: %u=%s)\n",
2074		 peer, reason,
2075		 ieee80211_get_reason_code_string(reason));
2076
2077	ieee80211_tdls_oper_request(&sdata->vif, peer,
2078				    NL80211_TDLS_TEARDOWN,
2079				    WLAN_REASON_TDLS_TEARDOWN_UNREACHABLE,
2080				    GFP_ATOMIC);
2081}