Adding upstream version 4.19.249.upstream/4.19.249

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 2017 insertions, 0 deletions

diff --git a/net/mac80211/tdls.c b/net/mac80211/tdls.c
new file mode 100644
index 000000000..aa6fabfed
--- /dev/null
+++ b/net/mac80211/tdls.c
@@ -0,0 +1,2017 @@
+/*
+ * mac80211 TDLS handling code
+ *
+ * Copyright 2006-2010	Johannes Berg <johannes@sipsolutions.net>
+ * Copyright 2014, Intel Corporation
+ * Copyright 2014  Intel Mobile Communications GmbH
+ * Copyright 2015 - 2016 Intel Deutschland GmbH
+ *
+ * This file is GPLv2 as found in COPYING.
+ */
+
+#include <linux/ieee80211.h>
+#include <linux/log2.h>
+#include <net/cfg80211.h>
+#include <linux/rtnetlink.h>
+#include "ieee80211_i.h"
+#include "driver-ops.h"
+#include "rate.h"
+#include "wme.h"
+
+/* 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,
+			     u.mgd.tdls_peer_del_work.work);
+	local = sdata->local;
+
+	mutex_lock(&local->mtx);
+	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);
+	}
+	mutex_unlock(&local->mtx);
+}
+
+static void ieee80211_tdls_add_ext_capab(struct ieee80211_sub_if_data *sdata,
+					 struct sk_buff *skb)
+{
+	struct ieee80211_local *local = sdata->local;
+	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
+	bool chan_switch = local->hw.wiphy->features &
+			   NL80211_FEATURE_TDLS_CHANNEL_SWITCH;
+	bool wider_band = ieee80211_hw_check(&local->hw, TDLS_WIDER_BW) &&
+			  !ifmgd->tdls_wider_bw_prohibited;
+	bool buffer_sta = ieee80211_hw_check(&local->hw,
+					     SUPPORTS_TDLS_BUFFER_STA);
+	struct ieee80211_supported_band *sband = ieee80211_get_sband(sdata);
+	bool vht = sband && sband->vht_cap.vht_supported;
+	u8 *pos = skb_put(skb, 10);
+
+	*pos++ = WLAN_EID_EXT_CAPABILITY;
+	*pos++ = 8; /* len */
+	*pos++ = 0x0;
+	*pos++ = 0x0;
+	*pos++ = 0x0;
+	*pos++ = (chan_switch ? WLAN_EXT_CAPA4_TDLS_CHAN_SWITCH : 0) |
+		 (buffer_sta ? WLAN_EXT_CAPA4_TDLS_BUFFER_STA : 0);
+	*pos++ = WLAN_EXT_CAPA5_TDLS_ENABLED;
+	*pos++ = 0;
+	*pos++ = 0;
+	*pos++ = (vht && wider_band) ? WLAN_EXT_CAPA8_TDLS_WIDE_BW_ENABLED : 0;
+}
+
+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;
+	struct wiphy *wiphy = sdata->local->hw.wiphy;
+
+	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,
+						NL80211_CHAN_NO_HT);
+			if (cfg80211_reg_can_beacon_relax(wiphy, &chandef,
+							  sdata->wdev.iftype)) {
+				ch_cnt++;
+				/*
+				 * check if the next channel is also part of
+				 * this allowed range
+				 */
+				continue;
+			}
+		}
+
+		/*
+		 * we've reached the end of a range, with allowed channels
+		 * found
+		 */
+		if (ch_cnt) {
+			u8 *pos = skb_put(skb, 2);
+			*pos++ = ieee80211_frequency_to_channel(subband_start);
+			*pos++ = ch_cnt;
+
+			subband_cnt++;
+			ch_cnt = 0;
+		}
+	}
+
+	/* 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++;
+	}
+
+	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;
+}
+
+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 */
+}
+
+static void ieee80211_tdls_add_bss_coex_ie(struct sk_buff *skb)
+{
+	u8 *pos = skb_put(skb, 3);
+
+	*pos++ = WLAN_EID_BSS_COEX_2040;
+	*pos++ = 1; /* len */
+
+	*pos++ = WLAN_BSS_COEX_INFORMATION_REQUEST;
+}
+
+static u16 ieee80211_get_tdls_sta_capab(struct ieee80211_sub_if_data *sdata,
+					u16 status_code)
+{
+	struct ieee80211_supported_band *sband;
+
+	/* The capability will be 0 when sending a failure code */
+	if (status_code != 0)
+		return 0;
+
+	sband = ieee80211_get_sband(sdata);
+	if (sband && sband->band == NL80211_BAND_2GHZ) {
+		return WLAN_CAPABILITY_SHORT_SLOT_TIME |
+		       WLAN_CAPABILITY_SHORT_PREAMBLE;
+	}
+
+	return 0;
+}
+
+static void ieee80211_tdls_add_link_ie(struct ieee80211_sub_if_data *sdata,
+				       struct sk_buff *skb, const u8 *peer,
+				       bool initiator)
+{
+	struct ieee80211_tdls_lnkie *lnkid;
+	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;
+	}
+
+	lnkid = skb_put(skb, sizeof(struct ieee80211_tdls_lnkie));
+
+	lnkid->ie_type = WLAN_EID_LINK_ID;
+	lnkid->ie_len = sizeof(struct ieee80211_tdls_lnkie) - 2;
+
+	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);
+}
+
+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 = skb_put(skb, 4);
+
+	*pos++ = WLAN_EID_AID;
+	*pos++ = 2; /* len */
+	put_unaligned_le16(ifmgd->aid, pos);
+}
+
+/* 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);
+		/* fall through */
+	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 = skb_put_zero(skb, 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);
+	}
+}
+
+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_sta_cap_chan_bw(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.center_freq2 = 0;
+			uc.width = NL80211_CHAN_WIDTH_80;
+			break;
+		}
+
+	if (!uc.center_freq1)
+		return;
+
+	/* proceed to downgrade the chandef until usable or the same as AP BW */
+	while (uc.width > max_width ||
+	       (uc.width > sta->tdls_chandef.width &&
+		!cfg80211_reg_can_beacon_relax(sdata->local->hw.wiphy, &uc,
+					       sdata->wdev.iftype)))
+		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;
+	}
+}
+
+static void
+ieee80211_tdls_add_setup_start_ies(struct ieee80211_sub_if_data *sdata,
+				   struct sk_buff *skb, const u8 *peer,
+				   u8 action_code, bool initiator,
+				   const u8 *extra_ies, size_t extra_ies_len)
+{
+	struct ieee80211_supported_band *sband;
+	struct ieee80211_local *local = sdata->local;
+	struct ieee80211_sta_ht_cap ht_cap;
+	struct ieee80211_sta_vht_cap vht_cap;
+	struct sta_info *sta = NULL;
+	size_t offset = 0, noffset;
+	u8 *pos;
+
+	sband = ieee80211_get_sband(sdata);
+	if (!sband)
+		return;
+
+	ieee80211_add_srates_ie(sdata, skb, false, sband->band);
+	ieee80211_add_ext_srates_ie(sdata, skb, false, sband->band);
+	ieee80211_tdls_add_supp_channels(sdata, skb);
+
+	/* 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);
+		skb_put_data(skb, extra_ies + offset, noffset - offset);
+		offset = noffset;
+	}
+
+	ieee80211_tdls_add_ext_capab(sdata, skb);
+
+	/* 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 */
+
+	/* 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);
+		skb_put_data(skb, extra_ies + offset, noffset - offset);
+		offset = noffset;
+	}
+
+	mutex_lock(&local->sta_mtx);
+
+	/* 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)) {
+			mutex_unlock(&local->sta_mtx);
+			return;
+		}
+
+		sta->tdls_chandef = sdata->vif.bss_conf.chandef;
+	}
+
+	ieee80211_tdls_add_oper_classes(sdata, skb);
+
+	/*
+	 * 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.
+	 */
+	memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
+
+	if ((action_code == WLAN_TDLS_SETUP_REQUEST ||
+	     action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) &&
+	    ht_cap.ht_supported) {
+		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));
+
+		pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
+		ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap);
+	}
+
+	if (ht_cap.ht_supported &&
+	    (ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40))
+		ieee80211_tdls_add_bss_coex_ie(skb);
+
+	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);
+		skb_put_data(skb, 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));
+	if ((action_code == WLAN_TDLS_SETUP_REQUEST ||
+	     action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) &&
+	    vht_cap.vht_supported) {
+		ieee80211_apply_vhtcap_overrides(sdata, &vht_cap);
+
+		/* the AID is present only when VHT is implemented */
+		if (action_code == WLAN_TDLS_SETUP_REQUEST)
+			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);
+	} 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);
+
+		/*
+		 * 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);
+	}
+
+	mutex_unlock(&local->sta_mtx);
+
+	/* add any remaining IEs */
+	if (extra_ies_len) {
+		noffset = extra_ies_len;
+		skb_put_data(skb, extra_ies + offset, noffset - offset);
+	}
+
+}
+
+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;
+	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
+	size_t offset = 0, noffset;
+	struct sta_info *sta, *ap_sta;
+	struct ieee80211_supported_band *sband;
+	u8 *pos;
+
+	sband = ieee80211_get_sband(sdata);
+	if (!sband)
+		return;
+
+	mutex_lock(&local->sta_mtx);
+
+	sta = sta_info_get(sdata, peer);
+	ap_sta = sta_info_get(sdata, ifmgd->bssid);
+	if (WARN_ON_ONCE(!sta || !ap_sta)) {
+		mutex_unlock(&local->sta_mtx);
+		return;
+	}
+
+	sta->tdls_chandef = sdata->vif.bss_conf.chandef;
+
+	/* 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);
+		skb_put_data(skb, extra_ies + offset, noffset - offset);
+		offset = noffset;
+	}
+
+	/* add the QoS param IE if both the peer and we support it */
+	if (local->hw.queues >= IEEE80211_NUM_ACS && sta->sta.wme)
+		ieee80211_tdls_add_wmm_param_ie(sdata, skb);
+
+	/* 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);
+		skb_put_data(skb, extra_ies + offset, noffset - offset);
+		offset = noffset;
+	}
+
+	/*
+	 * if HT support is only added in TDLS, we need an HT-operation IE.
+	 * add the IE as required by IEEE802.11-2012 9.23.3.2.
+	 */
+	if (!ap_sta->sta.ht_cap.ht_supported && sta->sta.ht_cap.ht_supported) {
+		u16 prot = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED |
+			   IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT |
+			   IEEE80211_HT_OP_MODE_NON_HT_STA_PRSNT;
+
+		pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_operation));
+		ieee80211_ie_build_ht_oper(pos, &sta->sta.ht_cap,
+					   &sdata->vif.bss_conf.chandef, prot,
+					   true);
+	}
+
+	ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
+
+	/* only include VHT-operation if not on the 2.4GHz band */
+	if (sband->band != NL80211_BAND_2GHZ &&
+	    sta->sta.vht_cap.vht_supported) {
+		/*
+		 * 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);
+
+		pos = skb_put(skb, 2 + sizeof(struct ieee80211_vht_operation));
+		ieee80211_ie_build_vht_oper(pos, &sta->sta.vht_cap,
+					    &sta->tdls_chandef);
+	}
+
+	mutex_unlock(&local->sta_mtx);
+
+	/* add any remaining IEs */
+	if (extra_ies_len) {
+		noffset = extra_ies_len;
+		skb_put_data(skb, extra_ies + offset, noffset - offset);
+	}
+}
+
+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;
+
+	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);
+		skb_put_data(skb, 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;
+		skb_put_data(skb, extra_ies + offset, noffset - offset);
+	}
+}
+
+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)
+		skb_put_data(skb, extra_ies, extra_ies_len);
+}
+
+static void ieee80211_tdls_add_ies(struct ieee80211_sub_if_data *sdata,
+				   struct sk_buff *skb, const u8 *peer,
+				   u8 action_code, u16 status_code,
+				   bool initiator, const u8 *extra_ies,
+				   size_t extra_ies_len, u8 oper_class,
+				   struct cfg80211_chan_def *chandef)
+{
+	switch (action_code) {
+	case WLAN_TDLS_SETUP_REQUEST:
+	case WLAN_TDLS_SETUP_RESPONSE:
+	case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
+		if (status_code == 0)
+			ieee80211_tdls_add_setup_start_ies(sdata, skb, peer,
+							   action_code,
+							   initiator,
+							   extra_ies,
+							   extra_ies_len);
+		break;
+	case WLAN_TDLS_SETUP_CONFIRM:
+		if (status_code == 0)
+			ieee80211_tdls_add_setup_cfm_ies(sdata, skb, peer,
+							 initiator, extra_ies,
+							 extra_ies_len);
+		break;
+	case WLAN_TDLS_TEARDOWN:
+	case WLAN_TDLS_DISCOVERY_REQUEST:
+		if (extra_ies_len)
+			skb_put_data(skb, extra_ies, extra_ies_len);
+		if (status_code == 0 || action_code == WLAN_TDLS_TEARDOWN)
+			ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
+		break;
+	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;
+	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;
+	}
+
+}
+
+static int
+ieee80211_prep_tdls_encap_data(struct wiphy *wiphy, struct net_device *dev,
+			       const u8 *peer, u8 action_code, u8 dialog_token,
+			       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 = 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;
+
+	/* network header is after the ethernet header */
+	skb_set_network_header(skb, ETH_HLEN);
+
+	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 =
+			cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata,
+								 status_code));
+		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 =
+			cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata,
+								 status_code));
+		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;
+	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;
+	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;
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int
+ieee80211_prep_tdls_direct(struct wiphy *wiphy, struct net_device *dev,
+			   const u8 *peer, u8 action_code, u8 dialog_token,
+			   u16 status_code, struct sk_buff *skb)
+{
+	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
+	struct ieee80211_mgmt *mgmt;
+
+	mgmt = skb_put_zero(skb, 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 =
+			cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata,
+								 status_code));
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+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)
+{
+	struct ieee80211_local *local = sdata->local;
+	struct sk_buff *skb;
+	int ret;
+
+	skb = netdev_alloc_skb(sdata->dev,
+			       local->hw.extra_tx_headroom +
+			       max(sizeof(struct ieee80211_mgmt),
+				   sizeof(struct ieee80211_tdls_data)) +
+			       50 + /* supported rates */
+			       10 + /* ext capab */
+			       26 + /* max(WMM-info, WMM-param) */
+			       2 + max(sizeof(struct ieee80211_ht_cap),
+				       sizeof(struct ieee80211_ht_operation)) +
+			       2 + max(sizeof(struct ieee80211_vht_cap),
+				       sizeof(struct ieee80211_vht_operation)) +
+			       50 + /* supported channels */
+			       3 + /* 40/20 BSS coex */
+			       4 + /* AID */
+			       4 + /* oper classes */
+			       extra_ies_len +
+			       sizeof(struct ieee80211_tdls_lnkie));
+	if (!skb)
+		return NULL;
+
+	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:
+	case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
+	case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
+		ret = ieee80211_prep_tdls_encap_data(local->hw.wiphy,
+						     sdata->dev, peer,
+						     action_code, dialog_token,
+						     status_code, skb);
+		break;
+	case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
+		ret = ieee80211_prep_tdls_direct(local->hw.wiphy, sdata->dev,
+						 peer, action_code,
+						 dialog_token, status_code,
+						 skb);
+		break;
+	default:
+		ret = -ENOTSUPP;
+		break;
+	}
+
+	if (ret < 0)
+		goto fail;
+
+	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;
+
+	rcu_read_lock();
+	sta = sta_info_get(sdata, peer);
+
+	/* infer the initiator if we can, to support old userspace */
+	switch (action_code) {
+	case WLAN_TDLS_SETUP_REQUEST:
+		if (sta) {
+			set_sta_flag(sta, WLAN_STA_TDLS_INITIATOR);
+			sta->sta.tdls_initiator = false;
+		}
+		/* fall-through */
+	case WLAN_TDLS_SETUP_CONFIRM:
+	case WLAN_TDLS_DISCOVERY_REQUEST:
+		initiator = true;
+		break;
+	case WLAN_TDLS_SETUP_RESPONSE:
+		/*
+		 * In some testing scenarios, we send a request and response.
+		 * Make the last packet sent take effect for the initiator
+		 * value.
+		 */
+		if (sta) {
+			clear_sta_flag(sta, WLAN_STA_TDLS_INITIATOR);
+			sta->sta.tdls_initiator = true;
+		}
+		/* fall-through */
+	case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
+		initiator = false;
+		break;
+	case WLAN_TDLS_TEARDOWN:
+	case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
+	case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
+		/* any value is ok */
+		break;
+	default:
+		ret = -ENOTSUPP;
+		break;
+	}
+
+	if (sta && test_sta_flag(sta, WLAN_STA_TDLS_INITIATOR))
+		initiator = true;
+
+	rcu_read_unlock();
+	if (ret < 0)
+		goto fail;
+
+	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) {
+		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->priority = 256 + 2;
+		break;
+	default:
+		skb->priority = 256 + 5;
+		break;
+	}
+	skb_set_queue_mapping(skb, ieee80211_select_queue(sdata, skb));
+
+	/*
+	 * 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) &&
+	    ieee80211_hw_check(&sdata->local->hw, REPORTS_TX_ACK_STATUS)) {
+		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);
+	}
+
+	/* disable bottom halves when entering the Tx path */
+	local_bh_disable();
+	__ieee80211_subif_start_xmit(skb, dev, flags, 0);
+	local_bh_enable();
+
+	return ret;
+
+fail:
+	dev_kfree_skb(skb);
+	return ret;
+}
+
+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)
+{
+	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
+	struct ieee80211_local *local = sdata->local;
+	enum ieee80211_smps_mode smps_mode = sdata->u.mgd.driver_smps_mode;
+	int ret;
+
+	/* 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;
+	}
+
+	mutex_lock(&local->mtx);
+
+	/* we don't support concurrent TDLS peer setups */
+	if (!is_zero_ether_addr(sdata->u.mgd.tdls_peer) &&
+	    !ether_addr_equal(sdata->u.mgd.tdls_peer, peer)) {
+		ret = -EBUSY;
+		goto out_unlock;
+	}
+
+	/*
+	 * 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
+	 * during setup through the AP path.
+	 * Allow error packets to be sent - sometimes we don't even add a STA
+	 * before failing the setup.
+	 */
+	if (status_code == 0) {
+		rcu_read_lock();
+		if (!sta_info_get(sdata, peer)) {
+			rcu_read_unlock();
+			ret = -ENOLINK;
+			goto out_unlock;
+		}
+		rcu_read_unlock();
+	}
+
+	ieee80211_flush_queues(local, sdata, false);
+	memcpy(sdata->u.mgd.tdls_peer, peer, ETH_ALEN);
+	mutex_unlock(&local->mtx);
+
+	/* we cannot take the mutex while preparing the setup packet */
+	ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, action_code,
+					      dialog_token, status_code,
+					      peer_capability, initiator,
+					      extra_ies, extra_ies_len, 0,
+					      NULL);
+	if (ret < 0) {
+		mutex_lock(&local->mtx);
+		eth_zero_addr(sdata->u.mgd.tdls_peer);
+		mutex_unlock(&local->mtx);
+		return ret;
+	}
+
+	ieee80211_queue_delayed_work(&sdata->local->hw,
+				     &sdata->u.mgd.tdls_peer_del_work,
+				     TDLS_PEER_SETUP_TIMEOUT);
+	return 0;
+
+out_unlock:
+	mutex_unlock(&local->mtx);
+	return ret;
+}
+
+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);
+	ieee80211_flush_queues(local, sdata, false);
+
+	ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, action_code,
+					      dialog_token, status_code,
+					      peer_capability, initiator,
+					      extra_ies, extra_ies_len, 0,
+					      NULL);
+	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;
+}
+
+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:
+		ret = ieee80211_tdls_mgmt_teardown(wiphy, dev, peer,
+						   action_code, dialog_token,
+						   status_code,
+						   peer_capability, initiator,
+						   extra_ies, extra_ies_len);
+		break;
+	case WLAN_TDLS_DISCOVERY_REQUEST:
+		/*
+		 * 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:
+	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,
+						      extra_ies_len, 0, NULL);
+		break;
+	default:
+		ret = -EOPNOTSUPP;
+		break;
+	}
+
+	tdls_dbg(sdata, "TDLS mgmt action %d peer %pM status %d\n",
+		 action_code, peer, ret);
+	return ret;
+}
+
+static void iee80211_tdls_recalc_chanctx(struct ieee80211_sub_if_data *sdata,
+					 struct sta_info *sta)
+{
+	struct ieee80211_local *local = sdata->local;
+	struct ieee80211_chanctx_conf *conf;
+	struct ieee80211_chanctx *ctx;
+	enum nl80211_chan_width width;
+	struct ieee80211_supported_band *sband;
+
+	mutex_lock(&local->chanctx_mtx);
+	conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
+					 lockdep_is_held(&local->chanctx_mtx));
+	if (conf) {
+		width = conf->def.width;
+		sband = local->hw.wiphy->bands[conf->def.chan->band];
+		ctx = container_of(conf, struct ieee80211_chanctx, conf);
+		ieee80211_recalc_chanctx_chantype(local, ctx);
+
+		/* if width changed and a peer is given, update its BW */
+		if (width != conf->def.width && sta &&
+		    test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW)) {
+			enum ieee80211_sta_rx_bandwidth bw;
+
+			bw = ieee80211_chan_width_to_rx_bw(conf->def.width);
+			bw = min(bw, ieee80211_sta_cap_rx_bw(sta));
+			if (bw != sta->sta.bandwidth) {
+				sta->sta.bandwidth = bw;
+				rate_control_rate_update(local, sband, sta,
+							 IEEE80211_RC_BW_CHANGED);
+				/*
+				 * if a TDLS peer BW was updated, we need to
+				 * recalc the chandef width again, to get the
+				 * correct chanctx min_def
+				 */
+				ieee80211_recalc_chanctx_chantype(local, ctx);
+			}
+		}
+
+	}
+	mutex_unlock(&local->chanctx_mtx);
+}
+
+static int iee80211_tdls_have_ht_peers(struct ieee80211_sub_if_data *sdata)
+{
+	struct sta_info *sta;
+	bool result = false;
+
+	rcu_read_lock();
+	list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) {
+		if (!sta->sta.tdls || sta->sdata != sdata || !sta->uploaded ||
+		    !test_sta_flag(sta, WLAN_STA_AUTHORIZED) ||
+		    !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH) ||
+		    !sta->sta.ht_cap.ht_supported)
+			continue;
+		result = true;
+		break;
+	}
+	rcu_read_unlock();
+
+	return result;
+}
+
+static void
+iee80211_tdls_recalc_ht_protection(struct ieee80211_sub_if_data *sdata,
+				   struct sta_info *sta)
+{
+	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
+	bool tdls_ht;
+	u16 protection = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED |
+			 IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT |
+			 IEEE80211_HT_OP_MODE_NON_HT_STA_PRSNT;
+	u16 opmode;
+
+	/* Nothing to do if the BSS connection uses HT */
+	if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
+		return;
+
+	tdls_ht = (sta && sta->sta.ht_cap.ht_supported) ||
+		  iee80211_tdls_have_ht_peers(sdata);
+
+	opmode = sdata->vif.bss_conf.ht_operation_mode;
+
+	if (tdls_ht)
+		opmode |= protection;
+	else
+		opmode &= ~protection;
+
+	if (opmode == sdata->vif.bss_conf.ht_operation_mode)
+		return;
+
+	sdata->vif.bss_conf.ht_operation_mode = opmode;
+	ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_HT);
+}
+
+int ieee80211_tdls_oper(struct wiphy *wiphy, struct net_device *dev,
+			const u8 *peer, enum nl80211_tdls_operation oper)
+{
+	struct sta_info *sta;
+	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
+	struct ieee80211_local *local = sdata->local;
+	int ret;
+
+	if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS))
+		return -ENOTSUPP;
+
+	if (sdata->vif.type != NL80211_IFTYPE_STATION)
+		return -EINVAL;
+
+	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;
+	}
+
+	/* protect possible bss_conf changes and avoid concurrency in
+	 * ieee80211_bss_info_change_notify()
+	 */
+	sdata_lock(sdata);
+	mutex_lock(&local->mtx);
+	tdls_dbg(sdata, "TDLS oper %d peer %pM\n", oper, peer);
+
+	switch (oper) {
+	case NL80211_TDLS_ENABLE_LINK:
+		if (sdata->vif.csa_active) {
+			tdls_dbg(sdata, "TDLS: disallow link during CSA\n");
+			ret = -EBUSY;
+			break;
+		}
+
+		mutex_lock(&local->sta_mtx);
+		sta = sta_info_get(sdata, peer);
+		if (!sta) {
+			mutex_unlock(&local->sta_mtx);
+			ret = -ENOLINK;
+			break;
+		}
+
+		iee80211_tdls_recalc_chanctx(sdata, sta);
+		iee80211_tdls_recalc_ht_protection(sdata, sta);
+
+		set_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
+		mutex_unlock(&local->sta_mtx);
+
+		WARN_ON_ONCE(is_zero_ether_addr(sdata->u.mgd.tdls_peer) ||
+			     !ether_addr_equal(sdata->u.mgd.tdls_peer, peer));
+		ret = 0;
+		break;
+	case NL80211_TDLS_DISABLE_LINK:
+		/*
+		 * 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);
+		/* flush a potentially queued teardown packet */
+		ieee80211_flush_queues(local, sdata, false);
+
+		ret = sta_info_destroy_addr(sdata, peer);
+
+		mutex_lock(&local->sta_mtx);
+		iee80211_tdls_recalc_ht_protection(sdata, NULL);
+		mutex_unlock(&local->sta_mtx);
+
+		iee80211_tdls_recalc_chanctx(sdata, NULL);
+		break;
+	default:
+		ret = -ENOTSUPP;
+		break;
+	}
+
+	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);
+	}
+
+	if (ret == 0)
+		ieee80211_queue_work(&sdata->local->hw,
+				     &sdata->u.mgd.request_smps_work);
+
+	mutex_unlock(&local->mtx);
+	sdata_unlock(sdata);
+	return ret;
+}
+
+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);
+
+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);
+}
+
+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 = {};
+	int ret;
+
+	params.action_code = WLAN_TDLS_CHANNEL_SWITCH_RESPONSE;
+	params.timestamp = rx_status->device_timestamp;
+
+	if (skb->len < baselen) {
+		tdls_dbg(sdata, "TDLS channel switch resp too short: %d\n",
+			 skb->len);
+		return -EINVAL;
+	}
+
+	mutex_lock(&local->sta_mtx);
+	sta = sta_info_get(sdata, tf->sa);
+	if (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) {
+		tdls_dbg(sdata, "TDLS chan switch from non-peer sta %pM\n",
+			 tf->sa);
+		ret = -EINVAL;
+		goto out;
+	}
+
+	params.sta = &sta->sta;
+	params.status = le16_to_cpu(tf->u.chan_switch_resp.status_code);
+	if (params.status != 0) {
+		ret = 0;
+		goto call_drv;
+	}
+
+	ieee802_11_parse_elems(tf->u.chan_switch_resp.variable,
+			       skb->len - baselen, false, &elems);
+	if (elems.parse_error) {
+		tdls_dbg(sdata, "Invalid IEs in TDLS channel switch resp\n");
+		ret = -EINVAL;
+		goto out;
+	}
+
+	if (!elems.ch_sw_timing || !elems.lnk_id) {
+		tdls_dbg(sdata, "TDLS channel switch resp - missing IEs\n");
+		ret = -EINVAL;
+		goto out;
+	}
+
+	/* validate the initiator is set correctly */
+	local_initiator =
+		!memcmp(elems.lnk_id->init_sta, sdata->vif.addr, ETH_ALEN);
+	if (local_initiator == sta->sta.tdls_initiator) {
+		tdls_dbg(sdata, "TDLS chan switch invalid lnk-id initiator\n");
+		ret = -EINVAL;
+		goto out;
+	}
+
+	params.switch_time = le16_to_cpu(elems.ch_sw_timing->switch_time);
+	params.switch_timeout = le16_to_cpu(elems.ch_sw_timing->switch_timeout);
+
+	params.tmpl_skb =
+		ieee80211_tdls_ch_sw_resp_tmpl_get(sta, &params.ch_sw_tm_ie);
+	if (!params.tmpl_skb) {
+		ret = -ENOENT;
+		goto out;
+	}
+
+	ret = 0;
+call_drv:
+	drv_tdls_recv_channel_switch(sdata->local, sdata, &params);
+
+	tdls_dbg(sdata,
+		 "TDLS channel switch response received from %pM status %d\n",
+		 tf->sa, params.status);
+
+out:
+	mutex_unlock(&local->sta_mtx);
+	dev_kfree_skb_any(params.tmpl_skb);
+	return ret;
+}
+
+static int
+ieee80211_process_tdls_channel_switch_req(struct ieee80211_sub_if_data *sdata,
+					  struct sk_buff *skb)
+{
+	struct ieee80211_local *local = sdata->local;
+	struct ieee802_11_elems elems;
+	struct cfg80211_chan_def chandef;
+	struct ieee80211_channel *chan;
+	enum nl80211_channel_type chan_type;
+	int freq;
+	u8 target_channel, oper_class;
+	bool local_initiator;
+	struct sta_info *sta;
+	enum nl80211_band band;
+	struct ieee80211_tdls_data *tf = (void *)skb->data;
+	struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb);
+	int baselen = offsetof(typeof(*tf), u.chan_switch_req.variable);
+	struct ieee80211_tdls_ch_sw_params params = {};
+	int ret = 0;
+
+	params.action_code = WLAN_TDLS_CHANNEL_SWITCH_REQUEST;
+	params.timestamp = rx_status->device_timestamp;
+
+	if (skb->len < baselen) {
+		tdls_dbg(sdata, "TDLS channel switch req too short: %d\n",
+			 skb->len);
+		return -EINVAL;
+	}
+
+	target_channel = tf->u.chan_switch_req.target_channel;
+	oper_class = tf->u.chan_switch_req.oper_class;
+
+	/*
+	 * We can't easily infer the channel band. The operating class is
+	 * ambiguous - there are multiple tables (US/Europe/JP/Global). The
+	 * solution here is to treat channels with number >14 as 5GHz ones,
+	 * and specifically check for the (oper_class, channel) combinations
+	 * where this doesn't hold. These are thankfully unique according to
+	 * IEEE802.11-2012.
+	 * We consider only the 2GHz and 5GHz bands and 20MHz+ channels as
+	 * valid here.
+	 */
+	if ((oper_class == 112 || oper_class == 2 || oper_class == 3 ||
+	     oper_class == 4 || oper_class == 5 || oper_class == 6) &&
+	     target_channel < 14)
+		band = NL80211_BAND_5GHZ;
+	else
+		band = target_channel < 14 ? NL80211_BAND_2GHZ :
+					     NL80211_BAND_5GHZ;
+
+	freq = ieee80211_channel_to_frequency(target_channel, band);
+	if (freq == 0) {
+		tdls_dbg(sdata, "Invalid channel in TDLS chan switch: %d\n",
+			 target_channel);
+		return -EINVAL;
+	}
+
+	chan = ieee80211_get_channel(sdata->local->hw.wiphy, freq);
+	if (!chan) {
+		tdls_dbg(sdata,
+			 "Unsupported channel for TDLS chan switch: %d\n",
+			 target_channel);
+		return -EINVAL;
+	}
+
+	ieee802_11_parse_elems(tf->u.chan_switch_req.variable,
+			       skb->len - baselen, false, &elems);
+	if (elems.parse_error) {
+		tdls_dbg(sdata, "Invalid IEs in TDLS channel switch req\n");
+		return -EINVAL;
+	}
+
+	if (!elems.ch_sw_timing || !elems.lnk_id) {
+		tdls_dbg(sdata, "TDLS channel switch req - missing IEs\n");
+		return -EINVAL;
+	}
+
+	if (!elems.sec_chan_offs) {
+		chan_type = NL80211_CHAN_HT20;
+	} else {
+		switch (elems.sec_chan_offs->sec_chan_offs) {
+		case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
+			chan_type = NL80211_CHAN_HT40PLUS;
+			break;
+		case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
+			chan_type = NL80211_CHAN_HT40MINUS;
+			break;
+		default:
+			chan_type = NL80211_CHAN_HT20;
+			break;
+		}
+	}
+
+	cfg80211_chandef_create(&chandef, chan, chan_type);
+
+	/* we will be active on the TDLS link */
+	if (!cfg80211_reg_can_beacon_relax(sdata->local->hw.wiphy, &chandef,
+					   sdata->wdev.iftype)) {
+		tdls_dbg(sdata, "TDLS chan switch to forbidden channel\n");
+		return -EINVAL;
+	}
+
+	mutex_lock(&local->sta_mtx);
+	sta = sta_info_get(sdata, tf->sa);
+	if (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) {
+		tdls_dbg(sdata, "TDLS chan switch from non-peer sta %pM\n",
+			 tf->sa);
+		ret = -EINVAL;
+		goto out;
+	}
+
+	params.sta = &sta->sta;
+
+	/* validate the initiator is set correctly */
+	local_initiator =
+		!memcmp(elems.lnk_id->init_sta, sdata->vif.addr, ETH_ALEN);
+	if (local_initiator == sta->sta.tdls_initiator) {
+		tdls_dbg(sdata, "TDLS chan switch invalid lnk-id initiator\n");
+		ret = -EINVAL;
+		goto out;
+	}
+
+	/* peer should have known better */
+	if (!sta->sta.ht_cap.ht_supported && elems.sec_chan_offs &&
+	    elems.sec_chan_offs->sec_chan_offs) {
+		tdls_dbg(sdata, "TDLS chan switch - wide chan unsupported\n");
+		ret = -ENOTSUPP;
+		goto out;
+	}
+
+	params.chandef = &chandef;
+	params.switch_time = le16_to_cpu(elems.ch_sw_timing->switch_time);
+	params.switch_timeout = le16_to_cpu(elems.ch_sw_timing->switch_timeout);
+
+	params.tmpl_skb =
+		ieee80211_tdls_ch_sw_resp_tmpl_get(sta,
+						   &params.ch_sw_tm_ie);
+	if (!params.tmpl_skb) {
+		ret = -ENOENT;
+		goto out;
+	}
+
+	drv_tdls_recv_channel_switch(sdata->local, sdata, &params);
+
+	tdls_dbg(sdata,
+		 "TDLS ch switch request received from %pM ch %d width %d\n",
+		 tf->sa, params.chandef->chan->center_freq,
+		 params.chandef->width);
+out:
+	mutex_unlock(&local->sta_mtx);
+	dev_kfree_skb_any(params.tmpl_skb);
+	return ret;
+}
+
+static void
+ieee80211_process_tdls_channel_switch(struct ieee80211_sub_if_data *sdata,
+				      struct sk_buff *skb)
+{
+	struct ieee80211_tdls_data *tf = (void *)skb->data;
+	struct wiphy *wiphy = sdata->local->hw.wiphy;
+
+	ASSERT_RTNL();
+
+	/* make sure the driver supports it */
+	if (!(wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH))
+		return;
+
+	/* we want to access the entire packet */
+	if (skb_linearize(skb))
+		return;
+	/*
+	 * The packet/size was already validated by mac80211 Rx path, only look
+	 * at the action type.
+	 */
+	switch (tf->action_code) {
+	case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
+		ieee80211_process_tdls_channel_switch_req(sdata, skb);
+		break;
+	case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
+		ieee80211_process_tdls_channel_switch_resp(sdata, skb);
+		break;
+	default:
+		WARN_ON_ONCE(1);
+		return;
+	}
+}
+
+void ieee80211_teardown_tdls_peers(struct ieee80211_sub_if_data *sdata)
+{
+	struct sta_info *sta;
+	u16 reason = WLAN_REASON_TDLS_TEARDOWN_UNSPECIFIED;
+
+	rcu_read_lock();
+	list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) {
+		if (!sta->sta.tdls || sta->sdata != sdata || !sta->uploaded ||
+		    !test_sta_flag(sta, WLAN_STA_AUTHORIZED))
+			continue;
+
+		ieee80211_tdls_oper_request(&sdata->vif, sta->sta.addr,
+					    NL80211_TDLS_TEARDOWN, reason,
+					    GFP_ATOMIC);
+	}
+	rcu_read_unlock();
+}
+
+void ieee80211_tdls_chsw_work(struct work_struct *wk)
+{
+	struct ieee80211_local *local =
+		container_of(wk, struct ieee80211_local, tdls_chsw_work);
+	struct ieee80211_sub_if_data *sdata;
+	struct sk_buff *skb;
+	struct ieee80211_tdls_data *tf;
+
+	rtnl_lock();
+	while ((skb = skb_dequeue(&local->skb_queue_tdls_chsw))) {
+		tf = (struct ieee80211_tdls_data *)skb->data;
+		list_for_each_entry(sdata, &local->interfaces, list) {
+			if (!ieee80211_sdata_running(sdata) ||
+			    sdata->vif.type != NL80211_IFTYPE_STATION ||
+			    !ether_addr_equal(tf->da, sdata->vif.addr))
+				continue;
+
+			ieee80211_process_tdls_channel_switch(sdata, skb);
+			break;
+		}
+
+		kfree_skb(skb);
+	}
+	rtnl_unlock();
+}
+
+void ieee80211_tdls_handle_disconnect(struct ieee80211_sub_if_data *sdata,
+				      const u8 *peer, u16 reason)
+{
+	struct ieee80211_sta *sta;
+
+	rcu_read_lock();
+	sta = ieee80211_find_sta(&sdata->vif, peer);
+	if (!sta || !sta->tdls) {
+		rcu_read_unlock();
+		return;
+	}
+	rcu_read_unlock();
+
+	tdls_dbg(sdata, "disconnected from TDLS peer %pM (Reason: %u=%s)\n",
+		 peer, reason,
+		 ieee80211_get_reason_code_string(reason));
+
+	ieee80211_tdls_oper_request(&sdata->vif, peer,
+				    NL80211_TDLS_TEARDOWN,
+				    WLAN_REASON_TDLS_TEARDOWN_UNREACHABLE,
+				    GFP_ATOMIC);
+}