tdls.c 52.5 KB
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/*
 * mac80211 TDLS handling code
 *
 * Copyright 2006-2010	Johannes Berg <johannes@sipsolutions.net>
 * Copyright 2014, Intel Corporation
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 * Copyright 2014  Intel Mobile Communications GmbH
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 * Copyright 2015  Intel Deutschland GmbH
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 *
 * This file is GPLv2 as found in COPYING.
 */

#include <linux/ieee80211.h>
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#include <linux/log2.h>
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#include <net/cfg80211.h>
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#include <linux/rtnetlink.h>
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#include "ieee80211_i.h"
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#include "driver-ops.h"
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/* give usermode some time for retries in setting up the TDLS session */
#define TDLS_PEER_SETUP_TIMEOUT	(15 * HZ)

void ieee80211_tdls_peer_del_work(struct work_struct *wk)
{
	struct ieee80211_sub_if_data *sdata;
	struct ieee80211_local *local;

	sdata = container_of(wk, struct ieee80211_sub_if_data,
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			     u.mgd.tdls_peer_del_work.work);
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	local = sdata->local;

	mutex_lock(&local->mtx);
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	if (!is_zero_ether_addr(sdata->u.mgd.tdls_peer)) {
		tdls_dbg(sdata, "TDLS del peer %pM\n", sdata->u.mgd.tdls_peer);
		sta_info_destroy_addr(sdata, sdata->u.mgd.tdls_peer);
		eth_zero_addr(sdata->u.mgd.tdls_peer);
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	}
	mutex_unlock(&local->mtx);
}

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static void ieee80211_tdls_add_ext_capab(struct ieee80211_sub_if_data *sdata,
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					 struct sk_buff *skb)
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{
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	struct ieee80211_local *local = sdata->local;
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	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
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	bool chan_switch = local->hw.wiphy->features &
			   NL80211_FEATURE_TDLS_CHANNEL_SWITCH;
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	bool wider_band = ieee80211_hw_check(&local->hw, TDLS_WIDER_BW) &&
			  !ifmgd->tdls_wider_bw_prohibited;
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	enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
	struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band];
	bool vht = sband && sband->vht_cap.vht_supported;
	u8 *pos = (void *)skb_put(skb, 10);
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	*pos++ = WLAN_EID_EXT_CAPABILITY;
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	*pos++ = 8; /* len */
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	*pos++ = 0x0;
	*pos++ = 0x0;
	*pos++ = 0x0;
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	*pos++ = chan_switch ? WLAN_EXT_CAPA4_TDLS_CHAN_SWITCH : 0;
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	*pos++ = WLAN_EXT_CAPA5_TDLS_ENABLED;
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	*pos++ = 0;
	*pos++ = 0;
	*pos++ = (vht && wider_band) ? WLAN_EXT_CAPA8_TDLS_WIDE_BW_ENABLED : 0;
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}

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static u8
ieee80211_tdls_add_subband(struct ieee80211_sub_if_data *sdata,
			   struct sk_buff *skb, u16 start, u16 end,
			   u16 spacing)
{
	u8 subband_cnt = 0, ch_cnt = 0;
	struct ieee80211_channel *ch;
	struct cfg80211_chan_def chandef;
	int i, subband_start;
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	struct wiphy *wiphy = sdata->local->hw.wiphy;
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	for (i = start; i <= end; i += spacing) {
		if (!ch_cnt)
			subband_start = i;

		ch = ieee80211_get_channel(sdata->local->hw.wiphy, i);
		if (ch) {
			/* we will be active on the channel */
			cfg80211_chandef_create(&chandef, ch,
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						NL80211_CHAN_NO_HT);
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			if (cfg80211_reg_can_beacon_relax(wiphy, &chandef,
							  sdata->wdev.iftype)) {
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				ch_cnt++;
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				/*
				 * check if the next channel is also part of
				 * this allowed range
				 */
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				continue;
			}
		}

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		/*
		 * we've reached the end of a range, with allowed channels
		 * found
		 */
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		if (ch_cnt) {
			u8 *pos = skb_put(skb, 2);
			*pos++ = ieee80211_frequency_to_channel(subband_start);
			*pos++ = ch_cnt;

			subband_cnt++;
			ch_cnt = 0;
		}
	}

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	/* all channels in the requested range are allowed - add them here */
	if (ch_cnt) {
		u8 *pos = skb_put(skb, 2);
		*pos++ = ieee80211_frequency_to_channel(subband_start);
		*pos++ = ch_cnt;

		subband_cnt++;
	}

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	return subband_cnt;
}

static void
ieee80211_tdls_add_supp_channels(struct ieee80211_sub_if_data *sdata,
				 struct sk_buff *skb)
{
	/*
	 * Add possible channels for TDLS. These are channels that are allowed
	 * to be active.
	 */
	u8 subband_cnt;
	u8 *pos = skb_put(skb, 2);

	*pos++ = WLAN_EID_SUPPORTED_CHANNELS;

	/*
	 * 5GHz and 2GHz channels numbers can overlap. Ignore this for now, as
	 * this doesn't happen in real world scenarios.
	 */

	/* 2GHz, with 5MHz spacing */
	subband_cnt = ieee80211_tdls_add_subband(sdata, skb, 2412, 2472, 5);

	/* 5GHz, with 20MHz spacing */
	subband_cnt += ieee80211_tdls_add_subband(sdata, skb, 5000, 5825, 20);

	/* length */
	*pos = 2 * subband_cnt;
}

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static void ieee80211_tdls_add_oper_classes(struct ieee80211_sub_if_data *sdata,
					    struct sk_buff *skb)
{
	u8 *pos;
	u8 op_class;

	if (!ieee80211_chandef_to_operating_class(&sdata->vif.bss_conf.chandef,
						  &op_class))
		return;

	pos = skb_put(skb, 4);
	*pos++ = WLAN_EID_SUPPORTED_REGULATORY_CLASSES;
	*pos++ = 2; /* len */

	*pos++ = op_class;
	*pos++ = op_class; /* give current operating class as alternate too */
}

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static void ieee80211_tdls_add_bss_coex_ie(struct sk_buff *skb)
{
	u8 *pos = (void *)skb_put(skb, 3);

	*pos++ = WLAN_EID_BSS_COEX_2040;
	*pos++ = 1; /* len */

	*pos++ = WLAN_BSS_COEX_INFORMATION_REQUEST;
}

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static u16 ieee80211_get_tdls_sta_capab(struct ieee80211_sub_if_data *sdata,
					u16 status_code)
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{
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	/* The capability will be 0 when sending a failure code */
	if (status_code != 0)
		return 0;

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	if (ieee80211_get_sdata_band(sdata) == IEEE80211_BAND_2GHZ) {
		return WLAN_CAPABILITY_SHORT_SLOT_TIME |
		       WLAN_CAPABILITY_SHORT_PREAMBLE;
	}
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	return 0;
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}

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static void ieee80211_tdls_add_link_ie(struct ieee80211_sub_if_data *sdata,
				       struct sk_buff *skb, const u8 *peer,
				       bool initiator)
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{
	struct ieee80211_tdls_lnkie *lnkid;
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	const u8 *init_addr, *rsp_addr;

	if (initiator) {
		init_addr = sdata->vif.addr;
		rsp_addr = peer;
	} else {
		init_addr = peer;
		rsp_addr = sdata->vif.addr;
	}
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	lnkid = (void *)skb_put(skb, sizeof(struct ieee80211_tdls_lnkie));

	lnkid->ie_type = WLAN_EID_LINK_ID;
	lnkid->ie_len = sizeof(struct ieee80211_tdls_lnkie) - 2;

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	memcpy(lnkid->bssid, sdata->u.mgd.bssid, ETH_ALEN);
	memcpy(lnkid->init_sta, init_addr, ETH_ALEN);
	memcpy(lnkid->resp_sta, rsp_addr, ETH_ALEN);
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}

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static void
ieee80211_tdls_add_aid(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
	u8 *pos = (void *)skb_put(skb, 4);

	*pos++ = WLAN_EID_AID;
	*pos++ = 2; /* len */
	put_unaligned_le16(ifmgd->aid, pos);
}

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/* translate numbering in the WMM parameter IE to the mac80211 notation */
static enum ieee80211_ac_numbers ieee80211_ac_from_wmm(int ac)
{
	switch (ac) {
	default:
		WARN_ON_ONCE(1);
	case 0:
		return IEEE80211_AC_BE;
	case 1:
		return IEEE80211_AC_BK;
	case 2:
		return IEEE80211_AC_VI;
	case 3:
		return IEEE80211_AC_VO;
	}
}

static u8 ieee80211_wmm_aci_aifsn(int aifsn, bool acm, int aci)
{
	u8 ret;

	ret = aifsn & 0x0f;
	if (acm)
		ret |= 0x10;
	ret |= (aci << 5) & 0x60;
	return ret;
}

static u8 ieee80211_wmm_ecw(u16 cw_min, u16 cw_max)
{
	return ((ilog2(cw_min + 1) << 0x0) & 0x0f) |
	       ((ilog2(cw_max + 1) << 0x4) & 0xf0);
}

static void ieee80211_tdls_add_wmm_param_ie(struct ieee80211_sub_if_data *sdata,
					    struct sk_buff *skb)
{
	struct ieee80211_wmm_param_ie *wmm;
	struct ieee80211_tx_queue_params *txq;
	int i;

	wmm = (void *)skb_put(skb, sizeof(*wmm));
	memset(wmm, 0, sizeof(*wmm));

	wmm->element_id = WLAN_EID_VENDOR_SPECIFIC;
	wmm->len = sizeof(*wmm) - 2;

	wmm->oui[0] = 0x00; /* Microsoft OUI 00:50:F2 */
	wmm->oui[1] = 0x50;
	wmm->oui[2] = 0xf2;
	wmm->oui_type = 2; /* WME */
	wmm->oui_subtype = 1; /* WME param */
	wmm->version = 1; /* WME ver */
	wmm->qos_info = 0; /* U-APSD not in use */

	/*
	 * Use the EDCA parameters defined for the BSS, or default if the AP
	 * doesn't support it, as mandated by 802.11-2012 section 10.22.4
	 */
	for (i = 0; i < IEEE80211_NUM_ACS; i++) {
		txq = &sdata->tx_conf[ieee80211_ac_from_wmm(i)];
		wmm->ac[i].aci_aifsn = ieee80211_wmm_aci_aifsn(txq->aifs,
							       txq->acm, i);
		wmm->ac[i].cw = ieee80211_wmm_ecw(txq->cw_min, txq->cw_max);
		wmm->ac[i].txop_limit = cpu_to_le16(txq->txop);
	}
}

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static void
ieee80211_tdls_chandef_vht_upgrade(struct ieee80211_sub_if_data *sdata,
				   struct sta_info *sta)
{
	/* IEEE802.11ac-2013 Table E-4 */
	u16 centers_80mhz[] = { 5210, 5290, 5530, 5610, 5690, 5775 };
	struct cfg80211_chan_def uc = sta->tdls_chandef;
	enum nl80211_chan_width max_width = ieee80211_get_sta_bw(&sta->sta);
	int i;

	/* only support upgrading non-narrow channels up to 80Mhz */
	if (max_width == NL80211_CHAN_WIDTH_5 ||
	    max_width == NL80211_CHAN_WIDTH_10)
		return;

	if (max_width > NL80211_CHAN_WIDTH_80)
		max_width = NL80211_CHAN_WIDTH_80;

	if (uc.width == max_width)
		return;
	/*
	 * Channel usage constrains in the IEEE802.11ac-2013 specification only
	 * allow expanding a 20MHz channel to 80MHz in a single way. In
	 * addition, there are no 40MHz allowed channels that are not part of
	 * the allowed 80MHz range in the 5GHz spectrum (the relevant one here).
	 */
	for (i = 0; i < ARRAY_SIZE(centers_80mhz); i++)
		if (abs(uc.chan->center_freq - centers_80mhz[i]) <= 30) {
			uc.center_freq1 = centers_80mhz[i];
			uc.width = NL80211_CHAN_WIDTH_80;
			break;
		}

	if (!uc.center_freq1)
		return;

	/* proceed to downgrade the chandef until usable or the same */
	while (uc.width > max_width &&
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	       !cfg80211_reg_can_beacon_relax(sdata->local->hw.wiphy, &uc,
					      sdata->wdev.iftype))
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		ieee80211_chandef_downgrade(&uc);

	if (!cfg80211_chandef_identical(&uc, &sta->tdls_chandef)) {
		tdls_dbg(sdata, "TDLS ch width upgraded %d -> %d\n",
			 sta->tdls_chandef.width, uc.width);

		/*
		 * the station is not yet authorized when BW upgrade is done,
		 * locking is not required
		 */
		sta->tdls_chandef = uc;
	}
}

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static void
ieee80211_tdls_add_setup_start_ies(struct ieee80211_sub_if_data *sdata,
				   struct sk_buff *skb, const u8 *peer,
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				   u8 action_code, bool initiator,
				   const u8 *extra_ies, size_t extra_ies_len)
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{
	enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
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	struct ieee80211_local *local = sdata->local;
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	struct ieee80211_supported_band *sband;
	struct ieee80211_sta_ht_cap ht_cap;
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	struct ieee80211_sta_vht_cap vht_cap;
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	struct sta_info *sta = NULL;
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	size_t offset = 0, noffset;
	u8 *pos;

	ieee80211_add_srates_ie(sdata, skb, false, band);
	ieee80211_add_ext_srates_ie(sdata, skb, false, band);
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	ieee80211_tdls_add_supp_channels(sdata, skb);
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	/* add any custom IEs that go before Extended Capabilities */
	if (extra_ies_len) {
		static const u8 before_ext_cap[] = {
			WLAN_EID_SUPP_RATES,
			WLAN_EID_COUNTRY,
			WLAN_EID_EXT_SUPP_RATES,
			WLAN_EID_SUPPORTED_CHANNELS,
			WLAN_EID_RSN,
		};
		noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
					     before_ext_cap,
					     ARRAY_SIZE(before_ext_cap),
					     offset);
		pos = skb_put(skb, noffset - offset);
		memcpy(pos, extra_ies + offset, noffset - offset);
		offset = noffset;
	}

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	ieee80211_tdls_add_ext_capab(sdata, skb);
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	/* add the QoS element if we support it */
	if (local->hw.queues >= IEEE80211_NUM_ACS &&
	    action_code != WLAN_PUB_ACTION_TDLS_DISCOVER_RES)
		ieee80211_add_wmm_info_ie(skb_put(skb, 9), 0); /* no U-APSD */

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	/* add any custom IEs that go before HT capabilities */
	if (extra_ies_len) {
		static const u8 before_ht_cap[] = {
			WLAN_EID_SUPP_RATES,
			WLAN_EID_COUNTRY,
			WLAN_EID_EXT_SUPP_RATES,
			WLAN_EID_SUPPORTED_CHANNELS,
			WLAN_EID_RSN,
			WLAN_EID_EXT_CAPABILITY,
			WLAN_EID_QOS_CAPA,
			WLAN_EID_FAST_BSS_TRANSITION,
			WLAN_EID_TIMEOUT_INTERVAL,
			WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
		};
		noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
					     before_ht_cap,
					     ARRAY_SIZE(before_ht_cap),
					     offset);
		pos = skb_put(skb, noffset - offset);
		memcpy(pos, extra_ies + offset, noffset - offset);
		offset = noffset;
	}

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	mutex_lock(&local->sta_mtx);
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	/* we should have the peer STA if we're already responding */
	if (action_code == WLAN_TDLS_SETUP_RESPONSE) {
		sta = sta_info_get(sdata, peer);
		if (WARN_ON_ONCE(!sta)) {
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			mutex_unlock(&local->sta_mtx);
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			return;
		}
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		sta->tdls_chandef = sdata->vif.bss_conf.chandef;
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	}

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	ieee80211_tdls_add_oper_classes(sdata, skb);

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	/*
	 * with TDLS we can switch channels, and HT-caps are not necessarily
	 * the same on all bands. The specification limits the setup to a
	 * single HT-cap, so use the current band for now.
	 */
	sband = local->hw.wiphy->bands[band];
	memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
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	if ((action_code == WLAN_TDLS_SETUP_REQUEST ||
	     action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) &&
	    ht_cap.ht_supported) {
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		ieee80211_apply_htcap_overrides(sdata, &ht_cap);

		/* disable SMPS in TDLS initiator */
		ht_cap.cap |= WLAN_HT_CAP_SM_PS_DISABLED
				<< IEEE80211_HT_CAP_SM_PS_SHIFT;

		pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
		ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap);
	} else if (action_code == WLAN_TDLS_SETUP_RESPONSE &&
		   ht_cap.ht_supported && sta->sta.ht_cap.ht_supported) {
		/* the peer caps are already intersected with our own */
		memcpy(&ht_cap, &sta->sta.ht_cap, sizeof(ht_cap));
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		pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
		ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap);
	}

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	if (ht_cap.ht_supported &&
	    (ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40))
		ieee80211_tdls_add_bss_coex_ie(skb);

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	ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);

	/* add any custom IEs that go before VHT capabilities */
	if (extra_ies_len) {
		static const u8 before_vht_cap[] = {
			WLAN_EID_SUPP_RATES,
			WLAN_EID_COUNTRY,
			WLAN_EID_EXT_SUPP_RATES,
			WLAN_EID_SUPPORTED_CHANNELS,
			WLAN_EID_RSN,
			WLAN_EID_EXT_CAPABILITY,
			WLAN_EID_QOS_CAPA,
			WLAN_EID_FAST_BSS_TRANSITION,
			WLAN_EID_TIMEOUT_INTERVAL,
			WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
			WLAN_EID_MULTI_BAND,
		};
		noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
					     before_vht_cap,
					     ARRAY_SIZE(before_vht_cap),
					     offset);
		pos = skb_put(skb, noffset - offset);
		memcpy(pos, extra_ies + offset, noffset - offset);
		offset = noffset;
	}

	/* build the VHT-cap similarly to the HT-cap */
	memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap));
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	if ((action_code == WLAN_TDLS_SETUP_REQUEST ||
	     action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) &&
	    vht_cap.vht_supported) {
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		ieee80211_apply_vhtcap_overrides(sdata, &vht_cap);

		/* the AID is present only when VHT is implemented */
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		if (action_code == WLAN_TDLS_SETUP_REQUEST)
			ieee80211_tdls_add_aid(sdata, skb);
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		pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
		ieee80211_ie_build_vht_cap(pos, &vht_cap, vht_cap.cap);
	} else if (action_code == WLAN_TDLS_SETUP_RESPONSE &&
		   vht_cap.vht_supported && sta->sta.vht_cap.vht_supported) {
		/* the peer caps are already intersected with our own */
		memcpy(&vht_cap, &sta->sta.vht_cap, sizeof(vht_cap));

		/* the AID is present only when VHT is implemented */
		ieee80211_tdls_add_aid(sdata, skb);

		pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
		ieee80211_ie_build_vht_cap(pos, &vht_cap, vht_cap.cap);
515
516
517
518
519
520
521

		/*
		 * if both peers support WIDER_BW, we can expand the chandef to
		 * a wider compatible one, up to 80MHz
		 */
		if (test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW))
			ieee80211_tdls_chandef_vht_upgrade(sdata, sta);
522
523
	}

524
	mutex_unlock(&local->sta_mtx);
525

526
527
528
529
530
531
	/* add any remaining IEs */
	if (extra_ies_len) {
		noffset = extra_ies_len;
		pos = skb_put(skb, noffset - offset);
		memcpy(pos, extra_ies + offset, noffset - offset);
	}
532

533
534
}

535
536
537
538
539
540
541
static void
ieee80211_tdls_add_setup_cfm_ies(struct ieee80211_sub_if_data *sdata,
				 struct sk_buff *skb, const u8 *peer,
				 bool initiator, const u8 *extra_ies,
				 size_t extra_ies_len)
{
	struct ieee80211_local *local = sdata->local;
542
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
543
	size_t offset = 0, noffset;
544
	struct sta_info *sta, *ap_sta;
545
	enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
546
547
	u8 *pos;

548
	mutex_lock(&local->sta_mtx);
549
550

	sta = sta_info_get(sdata, peer);
551
552
	ap_sta = sta_info_get(sdata, ifmgd->bssid);
	if (WARN_ON_ONCE(!sta || !ap_sta)) {
553
		mutex_unlock(&local->sta_mtx);
554
555
556
		return;
	}

557
558
	sta->tdls_chandef = sdata->vif.bss_conf.chandef;

559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
	/* add any custom IEs that go before the QoS IE */
	if (extra_ies_len) {
		static const u8 before_qos[] = {
			WLAN_EID_RSN,
		};
		noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
					     before_qos,
					     ARRAY_SIZE(before_qos),
					     offset);
		pos = skb_put(skb, noffset - offset);
		memcpy(pos, extra_ies + offset, noffset - offset);
		offset = noffset;
	}

	/* add the QoS param IE if both the peer and we support it */
574
	if (local->hw.queues >= IEEE80211_NUM_ACS && sta->sta.wme)
575
576
		ieee80211_tdls_add_wmm_param_ie(sdata, skb);

577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
	/* add any custom IEs that go before HT operation */
	if (extra_ies_len) {
		static const u8 before_ht_op[] = {
			WLAN_EID_RSN,
			WLAN_EID_QOS_CAPA,
			WLAN_EID_FAST_BSS_TRANSITION,
			WLAN_EID_TIMEOUT_INTERVAL,
		};
		noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
					     before_ht_op,
					     ARRAY_SIZE(before_ht_op),
					     offset);
		pos = skb_put(skb, noffset - offset);
		memcpy(pos, extra_ies + offset, noffset - offset);
		offset = noffset;
	}

	/* if HT support is only added in TDLS, we need an HT-operation IE */
	if (!ap_sta->sta.ht_cap.ht_supported && sta->sta.ht_cap.ht_supported) {
596
597
598
599
		pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_operation));
		/* send an empty HT operation IE */
		ieee80211_ie_build_ht_oper(pos, &sta->sta.ht_cap,
					   &sdata->vif.bss_conf.chandef, 0);
600
601
	}

602
603
604
	ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);

	/* only include VHT-operation if not on the 2.4GHz band */
605
	if (band != IEEE80211_BAND_2GHZ && sta->sta.vht_cap.vht_supported) {
606
607
608
609
610
611
612
		/*
		 * if both peers support WIDER_BW, we can expand the chandef to
		 * a wider compatible one, up to 80MHz
		 */
		if (test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW))
			ieee80211_tdls_chandef_vht_upgrade(sdata, sta);

613
614
		pos = skb_put(skb, 2 + sizeof(struct ieee80211_vht_operation));
		ieee80211_ie_build_vht_oper(pos, &sta->sta.vht_cap,
615
					    &sta->tdls_chandef);
616
617
	}

618
	mutex_unlock(&local->sta_mtx);
619

620
621
622
623
624
625
626
627
	/* add any remaining IEs */
	if (extra_ies_len) {
		noffset = extra_ies_len;
		pos = skb_put(skb, noffset - offset);
		memcpy(pos, extra_ies + offset, noffset - offset);
	}
}

628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
static void
ieee80211_tdls_add_chan_switch_req_ies(struct ieee80211_sub_if_data *sdata,
				       struct sk_buff *skb, const u8 *peer,
				       bool initiator, const u8 *extra_ies,
				       size_t extra_ies_len, u8 oper_class,
				       struct cfg80211_chan_def *chandef)
{
	struct ieee80211_tdls_data *tf;
	size_t offset = 0, noffset;
	u8 *pos;

	if (WARN_ON_ONCE(!chandef))
		return;

	tf = (void *)skb->data;
	tf->u.chan_switch_req.target_channel =
		ieee80211_frequency_to_channel(chandef->chan->center_freq);
	tf->u.chan_switch_req.oper_class = oper_class;

	if (extra_ies_len) {
		static const u8 before_lnkie[] = {
			WLAN_EID_SECONDARY_CHANNEL_OFFSET,
		};
		noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
					     before_lnkie,
					     ARRAY_SIZE(before_lnkie),
					     offset);
		pos = skb_put(skb, noffset - offset);
		memcpy(pos, extra_ies + offset, noffset - offset);
		offset = noffset;
	}

	ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);

	/* add any remaining IEs */
	if (extra_ies_len) {
		noffset = extra_ies_len;
		pos = skb_put(skb, noffset - offset);
		memcpy(pos, extra_ies + offset, noffset - offset);
	}
}

670
671
672
673
674
675
676
677
678
679
680
681
682
683
static void
ieee80211_tdls_add_chan_switch_resp_ies(struct ieee80211_sub_if_data *sdata,
					struct sk_buff *skb, const u8 *peer,
					u16 status_code, bool initiator,
					const u8 *extra_ies,
					size_t extra_ies_len)
{
	if (status_code == 0)
		ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);

	if (extra_ies_len)
		memcpy(skb_put(skb, extra_ies_len), extra_ies, extra_ies_len);
}

684
685
static void ieee80211_tdls_add_ies(struct ieee80211_sub_if_data *sdata,
				   struct sk_buff *skb, const u8 *peer,
686
687
				   u8 action_code, u16 status_code,
				   bool initiator, const u8 *extra_ies,
688
689
				   size_t extra_ies_len, u8 oper_class,
				   struct cfg80211_chan_def *chandef)
690
691
692
693
694
{
	switch (action_code) {
	case WLAN_TDLS_SETUP_REQUEST:
	case WLAN_TDLS_SETUP_RESPONSE:
	case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
695
696
697
698
699
700
		if (status_code == 0)
			ieee80211_tdls_add_setup_start_ies(sdata, skb, peer,
							   action_code,
							   initiator,
							   extra_ies,
							   extra_ies_len);
701
702
		break;
	case WLAN_TDLS_SETUP_CONFIRM:
703
704
705
706
707
		if (status_code == 0)
			ieee80211_tdls_add_setup_cfm_ies(sdata, skb, peer,
							 initiator, extra_ies,
							 extra_ies_len);
		break;
708
709
	case WLAN_TDLS_TEARDOWN:
	case WLAN_TDLS_DISCOVERY_REQUEST:
710
711
712
		if (extra_ies_len)
			memcpy(skb_put(skb, extra_ies_len), extra_ies,
			       extra_ies_len);
713
714
		if (status_code == 0 || action_code == WLAN_TDLS_TEARDOWN)
			ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
715
		break;
716
717
718
719
720
721
	case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
		ieee80211_tdls_add_chan_switch_req_ies(sdata, skb, peer,
						       initiator, extra_ies,
						       extra_ies_len,
						       oper_class, chandef);
		break;
722
723
724
725
726
727
	case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
		ieee80211_tdls_add_chan_switch_resp_ies(sdata, skb, peer,
							status_code,
							initiator, extra_ies,
							extra_ies_len);
		break;
728
729
730
731
	}

}

732
733
static int
ieee80211_prep_tdls_encap_data(struct wiphy *wiphy, struct net_device *dev,
734
			       const u8 *peer, u8 action_code, u8 dialog_token,
735
736
737
738
739
740
741
742
743
744
745
746
			       u16 status_code, struct sk_buff *skb)
{
	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
	struct ieee80211_tdls_data *tf;

	tf = (void *)skb_put(skb, offsetof(struct ieee80211_tdls_data, u));

	memcpy(tf->da, peer, ETH_ALEN);
	memcpy(tf->sa, sdata->vif.addr, ETH_ALEN);
	tf->ether_type = cpu_to_be16(ETH_P_TDLS);
	tf->payload_type = WLAN_TDLS_SNAP_RFTYPE;

747
748
749
	/* network header is after the ethernet header */
	skb_set_network_header(skb, ETH_HLEN);

750
751
752
753
754
755
756
757
	switch (action_code) {
	case WLAN_TDLS_SETUP_REQUEST:
		tf->category = WLAN_CATEGORY_TDLS;
		tf->action_code = WLAN_TDLS_SETUP_REQUEST;

		skb_put(skb, sizeof(tf->u.setup_req));
		tf->u.setup_req.dialog_token = dialog_token;
		tf->u.setup_req.capability =
758
759
			cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata,
								 status_code));
760
761
762
763
764
765
766
767
768
		break;
	case WLAN_TDLS_SETUP_RESPONSE:
		tf->category = WLAN_CATEGORY_TDLS;
		tf->action_code = WLAN_TDLS_SETUP_RESPONSE;

		skb_put(skb, sizeof(tf->u.setup_resp));
		tf->u.setup_resp.status_code = cpu_to_le16(status_code);
		tf->u.setup_resp.dialog_token = dialog_token;
		tf->u.setup_resp.capability =
769
770
			cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata,
								 status_code));
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
		break;
	case WLAN_TDLS_SETUP_CONFIRM:
		tf->category = WLAN_CATEGORY_TDLS;
		tf->action_code = WLAN_TDLS_SETUP_CONFIRM;

		skb_put(skb, sizeof(tf->u.setup_cfm));
		tf->u.setup_cfm.status_code = cpu_to_le16(status_code);
		tf->u.setup_cfm.dialog_token = dialog_token;
		break;
	case WLAN_TDLS_TEARDOWN:
		tf->category = WLAN_CATEGORY_TDLS;
		tf->action_code = WLAN_TDLS_TEARDOWN;

		skb_put(skb, sizeof(tf->u.teardown));
		tf->u.teardown.reason_code = cpu_to_le16(status_code);
		break;
	case WLAN_TDLS_DISCOVERY_REQUEST:
		tf->category = WLAN_CATEGORY_TDLS;
		tf->action_code = WLAN_TDLS_DISCOVERY_REQUEST;

		skb_put(skb, sizeof(tf->u.discover_req));
		tf->u.discover_req.dialog_token = dialog_token;
		break;
794
795
796
797
798
799
	case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
		tf->category = WLAN_CATEGORY_TDLS;
		tf->action_code = WLAN_TDLS_CHANNEL_SWITCH_REQUEST;

		skb_put(skb, sizeof(tf->u.chan_switch_req));
		break;
800
801
802
803
804
805
806
	case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
		tf->category = WLAN_CATEGORY_TDLS;
		tf->action_code = WLAN_TDLS_CHANNEL_SWITCH_RESPONSE;

		skb_put(skb, sizeof(tf->u.chan_switch_resp));
		tf->u.chan_switch_resp.status_code = cpu_to_le16(status_code);
		break;
807
808
809
810
811
812
813
814
815
	default:
		return -EINVAL;
	}

	return 0;
}

static int
ieee80211_prep_tdls_direct(struct wiphy *wiphy, struct net_device *dev,
816
			   const u8 *peer, u8 action_code, u8 dialog_token,
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
			   u16 status_code, struct sk_buff *skb)
{
	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
	struct ieee80211_mgmt *mgmt;

	mgmt = (void *)skb_put(skb, 24);
	memset(mgmt, 0, 24);
	memcpy(mgmt->da, peer, ETH_ALEN);
	memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
	memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN);

	mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
					  IEEE80211_STYPE_ACTION);

	switch (action_code) {
	case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
		skb_put(skb, 1 + sizeof(mgmt->u.action.u.tdls_discover_resp));
		mgmt->u.action.category = WLAN_CATEGORY_PUBLIC;
		mgmt->u.action.u.tdls_discover_resp.action_code =
			WLAN_PUB_ACTION_TDLS_DISCOVER_RES;
		mgmt->u.action.u.tdls_discover_resp.dialog_token =
			dialog_token;
		mgmt->u.action.u.tdls_discover_resp.capability =
840
841
			cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata,
								 status_code));
842
843
844
845
846
847
848
849
		break;
	default:
		return -EINVAL;
	}

	return 0;
}

850
851
852
853
854
855
856
static struct sk_buff *
ieee80211_tdls_build_mgmt_packet_data(struct ieee80211_sub_if_data *sdata,
				      const u8 *peer, u8 action_code,
				      u8 dialog_token, u16 status_code,
				      bool initiator, const u8 *extra_ies,
				      size_t extra_ies_len, u8 oper_class,
				      struct cfg80211_chan_def *chandef)
857
858
{
	struct ieee80211_local *local = sdata->local;
859
	struct sk_buff *skb;
860
861
	int ret;

862
	skb = netdev_alloc_skb(sdata->dev,
863
864
865
866
			       local->hw.extra_tx_headroom +
			       max(sizeof(struct ieee80211_mgmt),
				   sizeof(struct ieee80211_tdls_data)) +
			       50 + /* supported rates */
867
			       10 + /* ext capab */
868
869
870
			       26 + /* max(WMM-info, WMM-param) */
			       2 + max(sizeof(struct ieee80211_ht_cap),
				       sizeof(struct ieee80211_ht_operation)) +
871
872
			       2 + max(sizeof(struct ieee80211_vht_cap),
				       sizeof(struct ieee80211_vht_operation)) +
873
			       50 + /* supported channels */
874
			       3 + /* 40/20 BSS coex */
875
			       4 + /* AID */
876
			       4 + /* oper classes */
877
878
			       extra_ies_len +
			       sizeof(struct ieee80211_tdls_lnkie));
879
	if (!skb)
880
		return NULL;
881
882
883
884
885
886
887
888
889

	skb_reserve(skb, local->hw.extra_tx_headroom);

	switch (action_code) {
	case WLAN_TDLS_SETUP_REQUEST:
	case WLAN_TDLS_SETUP_RESPONSE:
	case WLAN_TDLS_SETUP_CONFIRM:
	case WLAN_TDLS_TEARDOWN:
	case WLAN_TDLS_DISCOVERY_REQUEST:
890
	case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
891
	case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
892
893
		ret = ieee80211_prep_tdls_encap_data(local->hw.wiphy,
						     sdata->dev, peer,
894
895
896
897
						     action_code, dialog_token,
						     status_code, skb);
		break;
	case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
898
899
		ret = ieee80211_prep_tdls_direct(local->hw.wiphy, sdata->dev,
						 peer, action_code,
900
901
902
903
904
905
906
907
908
909
910
						 dialog_token, status_code,
						 skb);
		break;
	default:
		ret = -ENOTSUPP;
		break;
	}

	if (ret < 0)
		goto fail;

911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
	ieee80211_tdls_add_ies(sdata, skb, peer, action_code, status_code,
			       initiator, extra_ies, extra_ies_len, oper_class,
			       chandef);
	return skb;

fail:
	dev_kfree_skb(skb);
	return NULL;
}

static int
ieee80211_tdls_prep_mgmt_packet(struct wiphy *wiphy, struct net_device *dev,
				const u8 *peer, u8 action_code, u8 dialog_token,
				u16 status_code, u32 peer_capability,
				bool initiator, const u8 *extra_ies,
				size_t extra_ies_len, u8 oper_class,
				struct cfg80211_chan_def *chandef)
{
	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
	struct sk_buff *skb = NULL;
	struct sta_info *sta;
	u32 flags = 0;
	int ret = 0;

935
936
937
938
	rcu_read_lock();
	sta = sta_info_get(sdata, peer);

	/* infer the initiator if we can, to support old userspace */
939
940
	switch (action_code) {
	case WLAN_TDLS_SETUP_REQUEST:
941
		if (sta) {
942
			set_sta_flag(sta, WLAN_STA_TDLS_INITIATOR);
943
944
			sta->sta.tdls_initiator = false;
		}
945
		/* fall-through */
946
947
	case WLAN_TDLS_SETUP_CONFIRM:
	case WLAN_TDLS_DISCOVERY_REQUEST:
948
		initiator = true;
949
950
		break;
	case WLAN_TDLS_SETUP_RESPONSE:
951
952
953
954
955
		/*
		 * In some testing scenarios, we send a request and response.
		 * Make the last packet sent take effect for the initiator
		 * value.
		 */
956
		if (sta) {
957
			clear_sta_flag(sta, WLAN_STA_TDLS_INITIATOR);
958
959
			sta->sta.tdls_initiator = true;
		}
960
		/* fall-through */
961
	case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
962
		initiator = false;
963
964
		break;
	case WLAN_TDLS_TEARDOWN:
965
	case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
966
	case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
967
		/* any value is ok */
968
969
970
		break;
	default:
		ret = -ENOTSUPP;
971
		break;
972
973
	}

974
975
	if (sta && test_sta_flag(sta, WLAN_STA_TDLS_INITIATOR))
		initiator = true;
976

977
978
979
980
	rcu_read_unlock();
	if (ret < 0)
		goto fail;

981
982
983
984
985
986
987
988
989
990
991
	skb = ieee80211_tdls_build_mgmt_packet_data(sdata, peer, action_code,
						    dialog_token, status_code,
						    initiator, extra_ies,
						    extra_ies_len, oper_class,
						    chandef);
	if (!skb) {
		ret = -EINVAL;
		goto fail;
	}

	if (action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) {
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
		ieee80211_tx_skb(sdata, skb);
		return 0;
	}

	/*
	 * According to 802.11z: Setup req/resp are sent in AC_BK, otherwise
	 * we should default to AC_VI.
	 */
	switch (action_code) {
	case WLAN_TDLS_SETUP_REQUEST:
	case WLAN_TDLS_SETUP_RESPONSE:
		skb_set_queue_mapping(skb, IEEE80211_AC_BK);
		skb->priority = 2;
		break;
	default:
		skb_set_queue_mapping(skb, IEEE80211_AC_VI);
		skb->priority = 5;
		break;
	}

1012
1013
1014
1015
1016
1017
	/*
	 * Set the WLAN_TDLS_TEARDOWN flag to indicate a teardown in progress.
	 * Later, if no ACK is returned from peer, we will re-send the teardown
	 * packet through the AP.
	 */
	if ((action_code == WLAN_TDLS_TEARDOWN) &&
1018
	    ieee80211_hw_check(&sdata->local->hw, REPORTS_TX_ACK_STATUS)) {
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
		bool try_resend; /* Should we keep skb for possible resend */

		/* If not sending directly to peer - no point in keeping skb */
		rcu_read_lock();
		sta = sta_info_get(sdata, peer);
		try_resend = sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
		rcu_read_unlock();

		spin_lock_bh(&sdata->u.mgd.teardown_lock);
		if (try_resend && !sdata->u.mgd.teardown_skb) {
			/* Mark it as requiring TX status callback  */
			flags |= IEEE80211_TX_CTL_REQ_TX_STATUS |
				 IEEE80211_TX_INTFL_MLME_CONN_TX;

			/*
			 * skb is copied since mac80211 will later set
			 * properties that might not be the same as the AP,
			 * such as encryption, QoS, addresses, etc.
			 *
			 * No problem if skb_copy() fails, so no need to check.
			 */
			sdata->u.mgd.teardown_skb = skb_copy(skb, GFP_ATOMIC);
			sdata->u.mgd.orig_teardown_skb = skb;
		}
		spin_unlock_bh(&sdata->u.mgd.teardown_lock);
	}

1046
1047
	/* disable bottom halves when entering the Tx path */
	local_bh_disable();
1048
	__ieee80211_subif_start_xmit(skb, dev, flags);
1049
1050
1051
1052
1053
1054
1055
1056
1057
	local_bh_enable();

	return ret;

fail:
	dev_kfree_skb(skb);
	return ret;
}

1058
1059
1060
1061
1062
static int
ieee80211_tdls_mgmt_setup(struct wiphy *wiphy, struct net_device *dev,
			  const u8 *peer, u8 action_code, u8 dialog_token,
			  u16 status_code, u32 peer_capability, bool initiator,
			  const u8 *extra_ies, size_t extra_ies_len)
1063
1064
1065
{
	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
	struct ieee80211_local *local = sdata->local;
1066
	enum ieee80211_smps_mode smps_mode = sdata->u.mgd.driver_smps_mode;
1067
1068
	int ret;

1069
1070
1071
1072
1073
1074
1075
1076
	/* don't support setup with forced SMPS mode that's not off */
	if (smps_mode != IEEE80211_SMPS_AUTOMATIC &&
	    smps_mode != IEEE80211_SMPS_OFF) {
		tdls_dbg(sdata, "Aborting TDLS setup due to SMPS mode %d\n",
			 smps_mode);
		return -ENOTSUPP;
	}

1077
1078
1079
	mutex_lock(&local->mtx);

	/* we don't support concurrent TDLS peer setups */
1080
1081
	if (!is_zero_ether_addr(sdata->u.mgd.tdls_peer) &&
	    !ether_addr_equal(sdata->u.mgd.tdls_peer, peer)) {
1082
		ret = -EBUSY;
1083
		goto out_unlock;
1084
1085
	}

1086
1087
1088
	/*
	 * make sure we have a STA representing the peer so we drop or buffer
	 * non-TDLS-setup frames to the peer. We can't send other packets
1089
1090
1091
	 * during setup through the AP path.
	 * Allow error packets to be sent - sometimes we don't even add a STA
	 * before failing the setup.
1092
	 */
1093
1094
1095
1096
1097
	if (status_code == 0) {
		rcu_read_lock();
		if (!sta_info_get(sdata, peer)) {
			rcu_read_unlock();
			ret = -ENOLINK;
1098
			goto out_unlock;
1099
		}
1100
1101
1102
		rcu_read_unlock();
	}

1103
	ieee80211_flush_queues(local, sdata, false);
1104
1105
	memcpy(sdata->u.mgd.tdls_peer, peer, ETH_ALEN);
	mutex_unlock(&local->mtx);
1106

1107
	/* we cannot take the mutex while preparing the setup packet */
1108
1109
	ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, action_code,
					      dialog_token, status_code,
1110
					      peer_capability, initiator,
1111
1112
					      extra_ies, extra_ies_len, 0,
					      NULL);
1113
1114
1115
1116
1117
1118
	if (ret < 0) {
		mutex_lock(&local->mtx);
		eth_zero_addr(sdata->u.mgd.tdls_peer);
		mutex_unlock(&local->mtx);
		return ret;
	}
1119

1120
	ieee80211_queue_delayed_work(&sdata->local->hw,
1121
				     &sdata->u.mgd.tdls_peer_del_work,
1122
				     TDLS_PEER_SETUP_TIMEOUT);
1123
	return 0;
1124

1125
out_unlock:
1126
	mutex_unlock(&local->mtx);
1127
1128
1129
	return ret;
}

1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
static int
ieee80211_tdls_mgmt_teardown(struct wiphy *wiphy, struct net_device *dev,
			     const u8 *peer, u8 action_code, u8 dialog_token,
			     u16 status_code, u32 peer_capability,
			     bool initiator, const u8 *extra_ies,
			     size_t extra_ies_len)
{
	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
	struct ieee80211_local *local = sdata->local;
	struct sta_info *sta;
	int ret;

	/*
	 * No packets can be transmitted to the peer via the AP during setup -
	 * the STA is set as a TDLS peer, but is not authorized.
	 * During teardown, we prevent direct transmissions by stopping the
	 * queues and flushing all direct packets.
	 */
	ieee80211_stop_vif_queues(local, sdata,
				  IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN);
1150
	ieee80211_flush_queues(local, sdata, false);
1151
1152
1153
1154

	ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, action_code,
					      dialog_token, status_code,
					      peer_capability, initiator,
1155
1156
					      extra_ies, extra_ies_len, 0,
					      NULL);
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
	if (ret < 0)
		sdata_err(sdata, "Failed sending TDLS teardown packet %d\n",
			  ret);

	/*
	 * Remove the STA AUTH flag to force further traffic through the AP. If
	 * the STA was unreachable, it was already removed.
	 */
	rcu_read_lock();
	sta = sta_info_get(sdata, peer);
	if (sta)
		clear_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
	rcu_read_unlock();

	ieee80211_wake_vif_queues(local, sdata,
				  IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN);

	return 0;
}

1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
int ieee80211_tdls_mgmt(struct wiphy *wiphy, struct net_device *dev,
			const u8 *peer, u8 action_code, u8 dialog_token,
			u16 status_code, u32 peer_capability,
			bool initiator, const u8 *extra_ies,
			size_t extra_ies_len)
{
	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
	int ret;

	if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS))
		return -ENOTSUPP;

	/* make sure we are in managed mode, and associated */
	if (sdata->vif.type != NL80211_IFTYPE_STATION ||
	    !sdata->u.mgd.associated)
		return -EINVAL;

	switch (action_code) {
	case WLAN_TDLS_SETUP_REQUEST:
	case WLAN_TDLS_SETUP_RESPONSE:
		ret = ieee80211_tdls_mgmt_setup(wiphy, dev, peer, action_code,
						dialog_token, status_code,
						peer_capability, initiator,
						extra_ies, extra_ies_len);
		break;
	case WLAN_TDLS_TEARDOWN:
1203
1204
1205
1206
1207
1208
		ret = ieee80211_tdls_mgmt_teardown(wiphy, dev, peer,
						   action_code, dialog_token,
						   status_code,
						   peer_capability, initiator,
						   extra_ies, extra_ies_len);
		break;
1209
	case WLAN_TDLS_DISCOVERY_REQUEST:
1210
1211
1212
1213
1214
1215
1216
1217
		/*
		 * Protect the discovery so we can hear the TDLS discovery
		 * response frame. It is transmitted directly and not buffered
		 * by the AP.
		 */
		drv_mgd_protect_tdls_discover(sdata->local, sdata);
		/* fall-through */
	case WLAN_TDLS_SETUP_CONFIRM:
1218
1219
1220
1221
1222
1223
1224
1225
	case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
		/* no special handling */
		ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer,
						      action_code,
						      dialog_token,
						      status_code,
						      peer_capability,
						      initiator, extra_ies,
1226
						      extra_ies_len, 0, NULL);
1227
1228
1229
1230
1231
		break;
	default:
		ret = -EOPNOTSUPP;
		break;
	}
1232
1233
1234
1235
1236
1237

	tdls_dbg(sdata, "TDLS mgmt action %d peer %pM status %d\n",
		 action_code, peer, ret);
	return ret;
}

1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
static void iee80211_tdls_recalc_chanctx(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_chanctx_conf *conf;
	struct ieee80211_chanctx *ctx;

	mutex_lock(&local->chanctx_mtx);
	conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
					 lockdep_is_held(&local->chanctx_mtx));
	if (conf) {
		ctx = container_of(conf, struct ieee80211_chanctx, conf);
		ieee80211_recalc_chanctx_chantype(local, ctx);
	}
	mutex_unlock(&local->chanctx_mtx);
}

1254
int ieee80211_tdls_oper(struct wiphy *wiphy, struct net_device *dev,
1255
			const u8 *peer, enum nl80211_tdls_operation oper)
1256
1257
1258
{
	struct sta_info *sta;
	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1259
1260
	struct ieee80211_local *local = sdata->local;
	int ret;
1261
1262
1263
1264
1265
1266
1267

	if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS))
		return -ENOTSUPP;

	if (sdata->vif.type != NL80211_IFTYPE_STATION)
		return -EINVAL;

1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
	switch (oper) {
	case NL80211_TDLS_ENABLE_LINK:
	case NL80211_TDLS_DISABLE_LINK:
		break;
	case NL80211_TDLS_TEARDOWN:
	case NL80211_TDLS_SETUP:
	case NL80211_TDLS_DISCOVERY_REQ:
		/* We don't support in-driver setup/teardown/discovery */
		return -ENOTSUPP;
	}

	mutex_lock(&local->mtx);
1280
1281
1282
1283
	tdls_dbg(sdata, "TDLS oper %d peer %pM\n", oper, peer);

	switch (oper) {
	case NL80211_TDLS_ENABLE_LINK:
1284
1285
1286
1287
1288
1289
		if (sdata->vif.csa_active) {
			tdls_dbg(sdata, "TDLS: disallow link during CSA\n");
			ret = -EBUSY;
			break;
		}

1290
1291
		iee80211_tdls_recalc_chanctx(sdata);

1292
1293
1294
1295
		rcu_read_lock();
		sta = sta_info_get(sdata, peer);
		if (!sta) {
			rcu_read_unlock();
1296
1297
			ret = -ENOLINK;
			break;
1298
1299
1300
1301
		}

		set_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
		rcu_read_unlock();
1302

1303
1304
		WARN_ON_ONCE(is_zero_ether_addr(sdata->u.mgd.tdls_peer) ||
			     !ether_addr_equal(sdata->u.mgd.tdls_peer, peer));
1305
		ret = 0;
1306
1307
		break;
	case NL80211_TDLS_DISABLE_LINK:
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
		/*
		 * The teardown message in ieee80211_tdls_mgmt_teardown() was
		 * created while the queues were stopped, so it might still be
		 * pending. Before flushing the queues we need to be sure the
		 * message is handled by the tasklet handling pending messages,
		 * otherwise we might start destroying the station before
		 * sending the teardown packet.
		 * Note that this only forces the tasklet to flush pendings -
		 * not to stop the tasklet from rescheduling itself.
		 */
		tasklet_kill(&local->tx_pending_tasklet);
1319
		/* flush a potentially queued teardown packet */
1320
		ieee80211_flush_queues(local, sdata, false);
1321

1322
		ret = sta_info_destroy_addr(sdata, peer);
1323
		iee80211_tdls_recalc_chanctx(sdata);
1324
		break;
1325
	default:
1326
1327
		ret = -ENOTSUPP;
		break;
1328
1329
	}

1330
1331
1332
	if (ret == 0 && ether_addr_equal(sdata->u.mgd.tdls_peer, peer)) {
		cancel_delayed_work(&sdata->u.mgd.tdls_peer_del_work);
		eth_zero_addr(sdata->u.mgd.tdls_peer);
1333
1334
	}

1335
1336
1337
1338
	if (ret == 0)
		ieee80211_queue_work(&sdata->local->hw,
				     &sdata->u.mgd.request_smps_work);

1339
1340
	mutex_unlock(&local->mtx);
	return ret;
1341
}
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357

void ieee80211_tdls_oper_request(struct ieee80211_vif *vif, const u8 *peer,
				 enum nl80211_tdls_operation oper,
				 u16 reason_code, gfp_t gfp)
{
	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);

	if (vif->type != NL80211_IFTYPE_STATION || !vif->bss_conf.assoc) {
		sdata_err(sdata, "Discarding TDLS oper %d - not STA or disconnected\n",
			  oper);
		return;
	}

	cfg80211_tdls_oper_request(sdata->dev, peer, oper, reason_code, gfp);
}
EXPORT_SYMBOL(ieee80211_tdls_oper_request);
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535

static void
iee80211_tdls_add_ch_switch_timing(u8 *buf, u16 switch_time, u16 switch_timeout)
{
	struct ieee80211_ch_switch_timing *ch_sw;

	*buf++ = WLAN_EID_CHAN_SWITCH_TIMING;
	*buf++ = sizeof(struct ieee80211_ch_switch_timing);

	ch_sw = (void *)buf;
	ch_sw->switch_time = cpu_to_le16(switch_time);
	ch_sw->switch_timeout = cpu_to_le16(switch_timeout);
}

/* find switch timing IE in SKB ready for Tx */
static const u8 *ieee80211_tdls_find_sw_timing_ie(struct sk_buff *skb)
{
	struct ieee80211_tdls_data *tf;
	const u8 *ie_start;

	/*
	 * Get the offset for the new location of the switch timing IE.
	 * The SKB network header will now point to the "payload_type"
	 * element of the TDLS data frame struct.
	 */
	tf = container_of(skb->data + skb_network_offset(skb),
			  struct ieee80211_tdls_data, payload_type);
	ie_start = tf->u.chan_switch_req.variable;
	return cfg80211_find_ie(WLAN_EID_CHAN_SWITCH_TIMING, ie_start,
				skb->len - (ie_start - skb->data));
}

static struct sk_buff *
ieee80211_tdls_ch_sw_tmpl_get(struct sta_info *sta, u8 oper_class,
			      struct cfg80211_chan_def *chandef,
			      u32 *ch_sw_tm_ie_offset)
{
	struct ieee80211_sub_if_data *sdata = sta->sdata;
	u8 extra_ies[2 + sizeof(struct ieee80211_sec_chan_offs_ie) +
		     2 + sizeof(struct ieee80211_ch_switch_timing)];
	int extra_ies_len = 2 + sizeof(struct ieee80211_ch_switch_timing);
	u8 *pos = extra_ies;
	struct sk_buff *skb;

	/*
	 * if chandef points to a wide channel add a Secondary-Channel
	 * Offset information element
	 */
	if (chandef->width == NL80211_CHAN_WIDTH_40) {
		struct ieee80211_sec_chan_offs_ie *sec_chan_ie;
		bool ht40plus;

		*pos++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET;
		*pos++ = sizeof(*sec_chan_ie);
		sec_chan_ie = (void *)pos;

		ht40plus = cfg80211_get_chandef_type(chandef) ==
							NL80211_CHAN_HT40PLUS;
		sec_chan_ie->sec_chan_offs = ht40plus ?
					     IEEE80211_HT_PARAM_CHA_SEC_ABOVE :
					     IEEE80211_HT_PARAM_CHA_SEC_BELOW;
		pos += sizeof(*sec_chan_ie);

		extra_ies_len += 2 + sizeof(struct ieee80211_sec_chan_offs_ie);
	}

	/* just set the values to 0, this is a template */
	iee80211_tdls_add_ch_switch_timing(pos, 0, 0);

	skb = ieee80211_tdls_build_mgmt_packet_data(sdata, sta->sta.addr,
					      WLAN_TDLS_CHANNEL_SWITCH_REQUEST,
					      0, 0, !sta->sta.tdls_initiator,
					      extra_ies, extra_ies_len,
					      oper_class, chandef);
	if (!skb)
		return NULL;

	skb = ieee80211_build_data_template(sdata, skb, 0);
	if (IS_ERR(skb)) {
		tdls_dbg(sdata, "Failed building TDLS channel switch frame\n");
		return NULL;
	}

	if (ch_sw_tm_ie_offset) {
		const u8 *tm_ie = ieee80211_tdls_find_sw_timing_ie(skb);

		if (!tm_ie) {
			tdls_dbg(sdata, "No switch timing IE in TDLS switch\n");
			dev_kfree_skb_any(skb);
			return NULL;
		}

		*ch_sw_tm_ie_offset = tm_ie - skb->data;
	}

	tdls_dbg(sdata,
		 "TDLS channel switch request template for %pM ch %d width %d\n",
		 sta->sta.addr, chandef->chan->center_freq, chandef->width);
	return skb;
}

int
ieee80211_tdls_channel_switch(struct wiphy *wiphy, struct net_device *dev,
			      const u8 *addr, u8 oper_class,
			      struct cfg80211_chan_def *chandef)
{
	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
	struct ieee80211_local *local = sdata->local;
	struct sta_info *sta;
	struct sk_buff *skb = NULL;
	u32 ch_sw_tm_ie;
	int ret;

	mutex_lock(&local->sta_mtx);
	sta = sta_info_get(sdata, addr);
	if (!sta) {
		tdls_dbg(sdata,
			 "Invalid TDLS peer %pM for channel switch request\n",
			 addr);
		ret = -ENOENT;
		goto out;
	}

	if (!test_sta_flag(sta, WLAN_STA_TDLS_CHAN_SWITCH)) {
		tdls_dbg(sdata, "TDLS channel switch unsupported by %pM\n",
			 addr);
		ret = -ENOTSUPP;
		goto out;
	}

	skb = ieee80211_tdls_ch_sw_tmpl_get(sta, oper_class, chandef,
					    &ch_sw_tm_ie);
	if (!skb) {
		ret = -ENOENT;
		goto out;
	}

	ret = drv_tdls_channel_switch(local, sdata, &sta->sta, oper_class,
				      chandef, skb, ch_sw_tm_ie);
	if (!ret)
		set_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL);

out:
	mutex_unlock(&local->sta_mtx);
	dev_kfree_skb_any(skb);
	return ret;
}

void
ieee80211_tdls_cancel_channel_switch(struct wiphy *wiphy,
				     struct net_device *dev,
				     const u8 *addr)
{
	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
	struct ieee80211_local *local = sdata->local;
	struct sta_info *sta;

	mutex_lock(&local->sta_mtx);
	sta = sta_info_get(sdata, addr);
	if (!sta) {
		tdls_dbg(sdata,
			 "Invalid TDLS peer %pM for channel switch cancel\n",
			 addr);
		goto out;
	}

	if (!test_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL)) {
		tdls_dbg(sdata, "TDLS channel switch not initiated by %pM\n",
			 addr);
		goto out;
	}

	drv_tdls_cancel_channel_switch(local, sdata, &sta->sta);
	clear_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL);

out:
	mutex_unlock(&local->sta_mtx);
}
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static struct sk_buff *
ieee80211_tdls_ch_sw_resp_tmpl_get(struct sta_info *sta,
				   u32 *ch_sw_tm_ie_offset)
{
	struct ieee80211_sub_if_data *sdata = sta->sdata;
	struct sk_buff *skb;
	u8 extra_ies[2 + sizeof(struct ieee80211_ch_switch_timing)];

	/* initial timing are always zero in the template */
	iee80211_tdls_add_ch_switch_timing(extra_ies, 0, 0);

	skb = ieee80211_tdls_build_mgmt_packet_data(sdata, sta->sta.addr,
					WLAN_TDLS_CHANNEL_SWITCH_RESPONSE,
					0, 0, !sta->sta.tdls_initiator,
					extra_ies, sizeof(extra_ies), 0, NULL);
	if (!skb)
		return NULL;

	skb = ieee80211_build_data_template(sdata, skb, 0);
	if (IS_ERR(skb)) {
		tdls_dbg(sdata,
			 "Failed building TDLS channel switch resp frame\n");
		return NULL;
	}

	if (ch_sw_tm_ie_offset) {
		const u8 *tm_ie = ieee80211_tdls_find_sw_timing_ie(skb);

		if (!tm_ie) {
			tdls_dbg(sdata,
				 "No switch timing IE in TDLS switch resp\n");
			dev_kfree_skb_any(skb);
			return NULL;
		}

		*ch_sw_tm_ie_offset = tm_ie - skb->data;
	}

	tdls_dbg(sdata, "TDLS get channel switch response template for %pM\n",
		 sta->sta.addr);
	return skb;
}

static int
ieee80211_process_tdls_channel_switch_resp(struct ieee80211_sub_if_data *sdata,
					   struct sk_buff *skb)
{
	struct ieee80211_local *local = sdata->local;
	struct ieee802_11_elems elems;
	struct sta_info *sta;
	struct ieee80211_tdls_data *tf = (void *)skb->data;
	bool local_initiator;
	struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb);
	int baselen = offsetof(typeof(*tf), u.chan_switch_resp.variable);
	struct ieee80211_tdls_ch_sw_params params = {