net/mac80211/tdls.c - kernel/msm-4.9 - Gitiles

 /*
  * mac80211 TDLS handling code
  *
  * Copyright 2006-2010	Johannes Berg <johannes@sipsolutions.net>
  * Copyright 2014, Intel Corporation
  *
  * This file is GPLv2 as found in COPYING.
  */

 #include <linux/ieee80211.h>
 #include "ieee80211_i.h"

 static void ieee80211_tdls_add_ext_capab(struct sk_buff *skb)
 {
 	u8 *pos = (void *)skb_put(skb, 7);

 	*pos++ = WLAN_EID_EXT_CAPABILITY;
 	*pos++ = 5; /* len */
 	*pos++ = 0x0;
 	*pos++ = 0x0;
 	*pos++ = 0x0;
 	*pos++ = 0x0;
 	*pos++ = WLAN_EXT_CAPA5_TDLS_ENABLED;
 }

 static u16 ieee80211_get_tdls_sta_capab(struct ieee80211_sub_if_data *sdata)
 {
 	struct ieee80211_local *local = sdata->local;
 	u16 capab;

 	capab = 0;
 	if (ieee80211_get_sdata_band(sdata) != IEEE80211_BAND_2GHZ)
 		return capab;

 	if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
 		capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
 	if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
 		capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;

 	return capab;
 }

 static void ieee80211_tdls_add_link_ie(struct sk_buff *skb, u8 *src_addr,
 				       u8 *peer, u8 *bssid)
 {
 	struct ieee80211_tdls_lnkie *lnkid;

 	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;

 	memcpy(lnkid->bssid, bssid, ETH_ALEN);
 	memcpy(lnkid->init_sta, src_addr, ETH_ALEN);
 	memcpy(lnkid->resp_sta, peer, ETH_ALEN);
 }

 static int
 ieee80211_prep_tdls_encap_data(struct wiphy *wiphy, struct net_device *dev,
 			       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);
 	enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
 	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;

 	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));

 		ieee80211_add_srates_ie(sdata, skb, false, band);
 		ieee80211_add_ext_srates_ie(sdata, skb, false, band);
 		ieee80211_tdls_add_ext_capab(skb);
 		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));

 		ieee80211_add_srates_ie(sdata, skb, false, band);
 		ieee80211_add_ext_srates_ie(sdata, skb, false, band);
 		ieee80211_tdls_add_ext_capab(skb);
 		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;
 	default:
 		return -EINVAL;
 	}

 	return 0;
 }

 static int
 ieee80211_prep_tdls_direct(struct wiphy *wiphy, struct net_device *dev,
 			   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);
 	enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
 	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 =
 			cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata));

 		ieee80211_add_srates_ie(sdata, skb, false, band);
 		ieee80211_add_ext_srates_ie(sdata, skb, false, band);
 		ieee80211_tdls_add_ext_capab(skb);
 		break;
 	default:
 		return -EINVAL;
 	}

 	return 0;
 }

 int ieee80211_tdls_mgmt(struct wiphy *wiphy, struct net_device *dev,
 			u8 *peer, u8 action_code, u8 dialog_token,
 			u16 status_code, u32 peer_capability,
 			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 sk_buff *skb = NULL;
 	bool send_direct;
 	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;

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

 	skb = dev_alloc_skb(local->hw.extra_tx_headroom +
 			    max(sizeof(struct ieee80211_mgmt),
 				sizeof(struct ieee80211_tdls_data)) +
 			    50 + /* supported rates */
 			    7 + /* ext capab */
 			    extra_ies_len +
 			    sizeof(struct ieee80211_tdls_lnkie));
 	if (!skb)
 		return -ENOMEM;

 	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:
 		ret = ieee80211_prep_tdls_encap_data(wiphy, dev, peer,
 						     action_code, dialog_token,
 						     status_code, skb);
 		send_direct = false;
 		break;
 	case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
 		ret = ieee80211_prep_tdls_direct(wiphy, dev, peer, action_code,
 						 dialog_token, status_code,
 						 skb);
 		send_direct = true;
 		break;
 	default:
 		ret = -ENOTSUPP;
 		break;
 	}

 	if (ret < 0)
 		goto fail;

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

 	/* the TDLS link IE is always added last */
 	switch (action_code) {
 	case WLAN_TDLS_SETUP_REQUEST:
 	case WLAN_TDLS_SETUP_CONFIRM:
 	case WLAN_TDLS_TEARDOWN:
 	case WLAN_TDLS_DISCOVERY_REQUEST:
 		/* we are the initiator */
 		ieee80211_tdls_add_link_ie(skb, sdata->vif.addr, peer,
 					   sdata->u.mgd.bssid);
 		break;
 	case WLAN_TDLS_SETUP_RESPONSE:
 	case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
 		/* we are the responder */
 		ieee80211_tdls_add_link_ie(skb, peer, sdata->vif.addr,
 					   sdata->u.mgd.bssid);
 		break;
 	default:
 		ret = -ENOTSUPP;
 		goto fail;
 	}

 	if (send_direct) {
 		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;
 	}

 	/* disable bottom halves when entering the Tx path */
 	local_bh_disable();
 	ret = ieee80211_subif_start_xmit(skb, dev);
 	local_bh_enable();

 	return ret;

 fail:
 	dev_kfree_skb(skb);
 	return ret;
 }

 int ieee80211_tdls_oper(struct wiphy *wiphy, struct net_device *dev,
 			u8 *peer, enum nl80211_tdls_operation oper)
 {
 	struct sta_info *sta;
 	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);

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

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

 	tdls_dbg(sdata, "TDLS oper %d peer %pM\n", oper, peer);

 	switch (oper) {
 	case NL80211_TDLS_ENABLE_LINK:
 		rcu_read_lock();
 		sta = sta_info_get(sdata, peer);
 		if (!sta) {
 			rcu_read_unlock();
 			return -ENOLINK;
 		}

 		set_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
 		rcu_read_unlock();
 		break;
 	case NL80211_TDLS_DISABLE_LINK:
 		return sta_info_destroy_addr(sdata, peer);
 	case NL80211_TDLS_TEARDOWN:
 	case NL80211_TDLS_SETUP:
 	case NL80211_TDLS_DISCOVERY_REQ:
 		/* We don't support in-driver setup/teardown/discovery */
 		return -ENOTSUPP;
 	default:
 		return -ENOTSUPP;
 	}

 	return 0;
 }
	/*
	* mac80211 TDLS handling code
	*
	* Copyright 2006-2010 Johannes Berg <johannes@sipsolutions.net>
	* Copyright 2014, Intel Corporation
	*
	* This file is GPLv2 as found in COPYING.
	*/

	#include <linux/ieee80211.h>
	#include "ieee80211_i.h"

	static void ieee80211_tdls_add_ext_capab(struct sk_buff *skb)
	{
	u8 pos = (void )skb_put(skb, 7);

	*pos++ = WLAN_EID_EXT_CAPABILITY;
	pos++ = 5; / len */
	*pos++ = 0x0;
	*pos++ = 0x0;
	*pos++ = 0x0;
	*pos++ = 0x0;
	*pos++ = WLAN_EXT_CAPA5_TDLS_ENABLED;
	}

	static u16 ieee80211_get_tdls_sta_capab(struct ieee80211_sub_if_data *sdata)
	{
	struct ieee80211_local *local = sdata->local;
	u16 capab;

	capab = 0;
	if (ieee80211_get_sdata_band(sdata) != IEEE80211_BAND_2GHZ)
	return capab;

	if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
	capab \|= WLAN_CAPABILITY_SHORT_SLOT_TIME;
	if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
	capab \|= WLAN_CAPABILITY_SHORT_PREAMBLE;

	return capab;
	}

	static void ieee80211_tdls_add_link_ie(struct sk_buff skb, u8 src_addr,
	u8 peer, u8 bssid)
	{
	struct ieee80211_tdls_lnkie *lnkid;

	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;

	memcpy(lnkid->bssid, bssid, ETH_ALEN);
	memcpy(lnkid->init_sta, src_addr, ETH_ALEN);
	memcpy(lnkid->resp_sta, peer, ETH_ALEN);
	}

	static int
	ieee80211_prep_tdls_encap_data(struct wiphy wiphy, struct net_device dev,
	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);
	enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
	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;

	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));

	ieee80211_add_srates_ie(sdata, skb, false, band);
	ieee80211_add_ext_srates_ie(sdata, skb, false, band);
	ieee80211_tdls_add_ext_capab(skb);
	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));

	ieee80211_add_srates_ie(sdata, skb, false, band);
	ieee80211_add_ext_srates_ie(sdata, skb, false, band);
	ieee80211_tdls_add_ext_capab(skb);
	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;
	default:
	return -EINVAL;
	}

	return 0;
	}

	static int
	ieee80211_prep_tdls_direct(struct wiphy wiphy, struct net_device dev,
	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);
	enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
	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 =
	cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata));

	ieee80211_add_srates_ie(sdata, skb, false, band);
	ieee80211_add_ext_srates_ie(sdata, skb, false, band);
	ieee80211_tdls_add_ext_capab(skb);
	break;
	default:
	return -EINVAL;
	}

	return 0;
	}

	int ieee80211_tdls_mgmt(struct wiphy wiphy, struct net_device dev,
	u8 *peer, u8 action_code, u8 dialog_token,
	u16 status_code, u32 peer_capability,
	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 sk_buff *skb = NULL;
	bool send_direct;
	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;

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

	skb = dev_alloc_skb(local->hw.extra_tx_headroom +
	max(sizeof(struct ieee80211_mgmt),
	sizeof(struct ieee80211_tdls_data)) +
	50 + /* supported rates */
	7 + /* ext capab */
	extra_ies_len +
	sizeof(struct ieee80211_tdls_lnkie));
	if (!skb)
	return -ENOMEM;

	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:
	ret = ieee80211_prep_tdls_encap_data(wiphy, dev, peer,
	action_code, dialog_token,
	status_code, skb);
	send_direct = false;
	break;
	case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
	ret = ieee80211_prep_tdls_direct(wiphy, dev, peer, action_code,
	dialog_token, status_code,
	skb);
	send_direct = true;
	break;
	default:
	ret = -ENOTSUPP;
	break;
	}

	if (ret < 0)
	goto fail;

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

	/* the TDLS link IE is always added last */
	switch (action_code) {
	case WLAN_TDLS_SETUP_REQUEST:
	case WLAN_TDLS_SETUP_CONFIRM:
	case WLAN_TDLS_TEARDOWN:
	case WLAN_TDLS_DISCOVERY_REQUEST:
	/* we are the initiator */
	ieee80211_tdls_add_link_ie(skb, sdata->vif.addr, peer,
	sdata->u.mgd.bssid);
	break;
	case WLAN_TDLS_SETUP_RESPONSE:
	case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
	/* we are the responder */
	ieee80211_tdls_add_link_ie(skb, peer, sdata->vif.addr,
	sdata->u.mgd.bssid);
	break;
	default:
	ret = -ENOTSUPP;
	goto fail;
	}

	if (send_direct) {
	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;
	}

	/* disable bottom halves when entering the Tx path */
	local_bh_disable();
	ret = ieee80211_subif_start_xmit(skb, dev);
	local_bh_enable();

	return ret;

	fail:
	dev_kfree_skb(skb);
	return ret;
	}

	int ieee80211_tdls_oper(struct wiphy wiphy, struct net_device dev,
	u8 *peer, enum nl80211_tdls_operation oper)
	{
	struct sta_info *sta;
	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);

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

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

	tdls_dbg(sdata, "TDLS oper %d peer %pM\n", oper, peer);

	switch (oper) {
	case NL80211_TDLS_ENABLE_LINK:
	rcu_read_lock();
	sta = sta_info_get(sdata, peer);
	if (!sta) {
	rcu_read_unlock();
	return -ENOLINK;
	}

	set_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
	rcu_read_unlock();
	break;
	case NL80211_TDLS_DISABLE_LINK:
	return sta_info_destroy_addr(sdata, peer);
	case NL80211_TDLS_TEARDOWN:
	case NL80211_TDLS_SETUP:
	case NL80211_TDLS_DISCOVERY_REQ:
	/* We don't support in-driver setup/teardown/discovery */
	return -ENOTSUPP;
	default:
	return -ENOTSUPP;
	}

	return 0;
	}