net/mac80211/ht.c - maze/linux - Git at Google

 /*
  * HT handling
  *
  * Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi>
  * Copyright 2002-2005, Instant802 Networks, Inc.
  * Copyright 2005-2006, Devicescape Software, Inc.
  * Copyright 2006-2007	Jiri Benc <jbenc@suse.cz>
  * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
  * Copyright 2007-2010, Intel Corporation
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
  * published by the Free Software Foundation.
  */

 #include <linux/ieee80211.h>
 #include <net/mac80211.h>
 #include "ieee80211_i.h"
 #include "rate.h"

 void ieee80211_ht_cap_ie_to_sta_ht_cap(struct ieee80211_supported_band *sband,
 				       struct ieee80211_ht_cap *ht_cap_ie,
 				       struct ieee80211_sta_ht_cap *ht_cap)
 {
 	u8 ampdu_info, tx_mcs_set_cap;
 	int i, max_tx_streams;

 	BUG_ON(!ht_cap);

 	memset(ht_cap, 0, sizeof(*ht_cap));

 	if (!ht_cap_ie)
 		return;

 	ht_cap->ht_supported = true;

 	/*
 	 * The bits listed in this expression should be
 	 * the same for the peer and us, if the station
 	 * advertises more then we can't use those thus
 	 * we mask them out.
 	 */
 	ht_cap->cap = le16_to_cpu(ht_cap_ie->cap_info) &
 		(sband->ht_cap.cap |
 		 ~(IEEE80211_HT_CAP_LDPC_CODING |
 		   IEEE80211_HT_CAP_SUP_WIDTH_20_40 |
 		   IEEE80211_HT_CAP_GRN_FLD |
 		   IEEE80211_HT_CAP_SGI_20 |
 		   IEEE80211_HT_CAP_SGI_40 |
 		   IEEE80211_HT_CAP_DSSSCCK40));
 	/*
 	 * The STBC bits are asymmetric -- if we don't have
 	 * TX then mask out the peer's RX and vice versa.
 	 */
 	if (!(sband->ht_cap.cap & IEEE80211_HT_CAP_TX_STBC))
 		ht_cap->cap &= ~IEEE80211_HT_CAP_RX_STBC;
 	if (!(sband->ht_cap.cap & IEEE80211_HT_CAP_RX_STBC))
 		ht_cap->cap &= ~IEEE80211_HT_CAP_TX_STBC;

 	ampdu_info = ht_cap_ie->ampdu_params_info;
 	ht_cap->ampdu_factor =
 		ampdu_info & IEEE80211_HT_AMPDU_PARM_FACTOR;
 	ht_cap->ampdu_density =
 		(ampdu_info & IEEE80211_HT_AMPDU_PARM_DENSITY) >> 2;

 	/* own MCS TX capabilities */
 	tx_mcs_set_cap = sband->ht_cap.mcs.tx_params;

 	/* can we TX with MCS rates? */
 	if (!(tx_mcs_set_cap & IEEE80211_HT_MCS_TX_DEFINED))
 		return;

 	/* Counting from 0, therefore +1 */
 	if (tx_mcs_set_cap & IEEE80211_HT_MCS_TX_RX_DIFF)
 		max_tx_streams =
 			((tx_mcs_set_cap & IEEE80211_HT_MCS_TX_MAX_STREAMS_MASK)
 				>> IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT) + 1;
 	else
 		max_tx_streams = IEEE80211_HT_MCS_TX_MAX_STREAMS;

 	/*
 	 * 802.11n D5.0 20.3.5 / 20.6 says:
 	 * - indices 0 to 7 and 32 are single spatial stream
 	 * - 8 to 31 are multiple spatial streams using equal modulation
 	 *   [8..15 for two streams, 16..23 for three and 24..31 for four]
 	 * - remainder are multiple spatial streams using unequal modulation
 	 */
 	for (i = 0; i < max_tx_streams; i++)
 		ht_cap->mcs.rx_mask[i] =
 			sband->ht_cap.mcs.rx_mask[i] & ht_cap_ie->mcs.rx_mask[i];

 	if (tx_mcs_set_cap & IEEE80211_HT_MCS_TX_UNEQUAL_MODULATION)
 		for (i = IEEE80211_HT_MCS_UNEQUAL_MODULATION_START_BYTE;
 		     i < IEEE80211_HT_MCS_MASK_LEN; i++)
 			ht_cap->mcs.rx_mask[i] =
 				sband->ht_cap.mcs.rx_mask[i] &
 					ht_cap_ie->mcs.rx_mask[i];

 	/* handle MCS rate 32 too */
 	if (sband->ht_cap.mcs.rx_mask[32/8] & ht_cap_ie->mcs.rx_mask[32/8] & 1)
 		ht_cap->mcs.rx_mask[32/8] |= 1;
 }

 void ieee80211_sta_tear_down_BA_sessions(struct sta_info *sta)
 {
 	int i;

 	cancel_work_sync(&sta->ampdu_mlme.work);

 	for (i = 0; i <  STA_TID_NUM; i++) {
 		__ieee80211_stop_tx_ba_session(sta, i, WLAN_BACK_INITIATOR);
 		__ieee80211_stop_rx_ba_session(sta, i, WLAN_BACK_RECIPIENT,
 					       WLAN_REASON_QSTA_LEAVE_QBSS);
 	}
 }

 void ieee80211_ba_session_work(struct work_struct *work)
 {
 	struct sta_info *sta =
 		container_of(work, struct sta_info, ampdu_mlme.work);
 	struct tid_ampdu_tx *tid_tx;
 	int tid;

 	/*
 	 * When this flag is set, new sessions should be
 	 * blocked, and existing sessions will be torn
 	 * down by the code that set the flag, so this
 	 * need not run.
 	 */
 	if (test_sta_flags(sta, WLAN_STA_BLOCK_BA))
 		return;

 	mutex_lock(&sta->ampdu_mlme.mtx);
 	for (tid = 0; tid < STA_TID_NUM; tid++) {
 		if (test_and_clear_bit(tid, sta->ampdu_mlme.tid_rx_timer_expired))
 			___ieee80211_stop_rx_ba_session(
 				sta, tid, WLAN_BACK_RECIPIENT,
 				WLAN_REASON_QSTA_TIMEOUT);

 		tid_tx = sta->ampdu_mlme.tid_tx[tid];
 		if (!tid_tx)
 			continue;

 		if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state))
 			ieee80211_tx_ba_session_handle_start(sta, tid);
 		else if (test_and_clear_bit(HT_AGG_STATE_WANT_STOP,
 					    &tid_tx->state))
 			___ieee80211_stop_tx_ba_session(sta, tid,
 							WLAN_BACK_INITIATOR);
 	}
 	mutex_unlock(&sta->ampdu_mlme.mtx);
 }

 void ieee80211_send_delba(struct ieee80211_sub_if_data *sdata,
 			  const u8 *da, u16 tid,
 			  u16 initiator, u16 reason_code)
 {
 	struct ieee80211_local *local = sdata->local;
 	struct sk_buff *skb;
 	struct ieee80211_mgmt *mgmt;
 	u16 params;

 	skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);

 	if (!skb) {
 		printk(KERN_ERR "%s: failed to allocate buffer "
 					"for delba frame\n", sdata->name);
 		return;
 	}

 	skb_reserve(skb, local->hw.extra_tx_headroom);
 	mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 	memset(mgmt, 0, 24);
 	memcpy(mgmt->da, da, ETH_ALEN);
 	memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 	if (sdata->vif.type == NL80211_IFTYPE_AP ||
 	    sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
 		memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
 	else if (sdata->vif.type == NL80211_IFTYPE_STATION)
 		memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN);

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

 	skb_put(skb, 1 + sizeof(mgmt->u.action.u.delba));

 	mgmt->u.action.category = WLAN_CATEGORY_BACK;
 	mgmt->u.action.u.delba.action_code = WLAN_ACTION_DELBA;
 	params = (u16)(initiator << 11); 	/* bit 11 initiator */
 	params |= (u16)(tid << 12); 		/* bit 15:12 TID number */

 	mgmt->u.action.u.delba.params = cpu_to_le16(params);
 	mgmt->u.action.u.delba.reason_code = cpu_to_le16(reason_code);

 	ieee80211_tx_skb(sdata, skb);
 }

 void ieee80211_process_delba(struct ieee80211_sub_if_data *sdata,
 			     struct sta_info *sta,
 			     struct ieee80211_mgmt *mgmt, size_t len)
 {
 	u16 tid, params;
 	u16 initiator;

 	params = le16_to_cpu(mgmt->u.action.u.delba.params);
 	tid = (params & IEEE80211_DELBA_PARAM_TID_MASK) >> 12;
 	initiator = (params & IEEE80211_DELBA_PARAM_INITIATOR_MASK) >> 11;

 #ifdef CONFIG_MAC80211_HT_DEBUG
 	if (net_ratelimit())
 		printk(KERN_DEBUG "delba from %pM (%s) tid %d reason code %d\n",
 			mgmt->sa, initiator ? "initiator" : "recipient", tid,
 			le16_to_cpu(mgmt->u.action.u.delba.reason_code));
 #endif /* CONFIG_MAC80211_HT_DEBUG */

 	if (initiator == WLAN_BACK_INITIATOR)
 		__ieee80211_stop_rx_ba_session(sta, tid, WLAN_BACK_INITIATOR, 0);
 	else
 		__ieee80211_stop_tx_ba_session(sta, tid, WLAN_BACK_RECIPIENT);
 }

 int ieee80211_send_smps_action(struct ieee80211_sub_if_data *sdata,
 			       enum ieee80211_smps_mode smps, const u8 *da,
 			       const u8 *bssid)
 {
 	struct ieee80211_local *local = sdata->local;
 	struct sk_buff *skb;
 	struct ieee80211_mgmt *action_frame;

 	/* 27 = header + category + action + smps mode */
 	skb = dev_alloc_skb(27 + local->hw.extra_tx_headroom);
 	if (!skb)
 		return -ENOMEM;

 	skb_reserve(skb, local->hw.extra_tx_headroom);
 	action_frame = (void *)skb_put(skb, 27);
 	memcpy(action_frame->da, da, ETH_ALEN);
 	memcpy(action_frame->sa, sdata->dev->dev_addr, ETH_ALEN);
 	memcpy(action_frame->bssid, bssid, ETH_ALEN);
 	action_frame->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 						  IEEE80211_STYPE_ACTION);
 	action_frame->u.action.category = WLAN_CATEGORY_HT;
 	action_frame->u.action.u.ht_smps.action = WLAN_HT_ACTION_SMPS;
 	switch (smps) {
 	case IEEE80211_SMPS_AUTOMATIC:
 	case IEEE80211_SMPS_NUM_MODES:
 		WARN_ON(1);
 	case IEEE80211_SMPS_OFF:
 		action_frame->u.action.u.ht_smps.smps_control =
 				WLAN_HT_SMPS_CONTROL_DISABLED;
 		break;
 	case IEEE80211_SMPS_STATIC:
 		action_frame->u.action.u.ht_smps.smps_control =
 				WLAN_HT_SMPS_CONTROL_STATIC;
 		break;
 	case IEEE80211_SMPS_DYNAMIC:
 		action_frame->u.action.u.ht_smps.smps_control =
 				WLAN_HT_SMPS_CONTROL_DYNAMIC;
 		break;
 	}

 	/* we'll do more on status of this frame */
 	IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
 	ieee80211_tx_skb(sdata, skb);

 	return 0;
 }
	/*
	* HT handling
	*
	* Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi>
	* Copyright 2002-2005, Instant802 Networks, Inc.
	* Copyright 2005-2006, Devicescape Software, Inc.
	* Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
	* Copyright 2007, Michael Wu <flamingice@sourmilk.net>
	* Copyright 2007-2010, Intel Corporation
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License version 2 as
	* published by the Free Software Foundation.
	*/

	#include <linux/ieee80211.h>
	#include <net/mac80211.h>
	#include "ieee80211_i.h"
	#include "rate.h"

	void ieee80211_ht_cap_ie_to_sta_ht_cap(struct ieee80211_supported_band *sband,
	struct ieee80211_ht_cap *ht_cap_ie,
	struct ieee80211_sta_ht_cap *ht_cap)
	{
	u8 ampdu_info, tx_mcs_set_cap;
	int i, max_tx_streams;

	BUG_ON(!ht_cap);

	memset(ht_cap, 0, sizeof(*ht_cap));

	if (!ht_cap_ie)
	return;

	ht_cap->ht_supported = true;

	/*
	* The bits listed in this expression should be
	* the same for the peer and us, if the station
	* advertises more then we can't use those thus
	* we mask them out.
	*/
	ht_cap->cap = le16_to_cpu(ht_cap_ie->cap_info) &
	(sband->ht_cap.cap \|
	~(IEEE80211_HT_CAP_LDPC_CODING \|
	IEEE80211_HT_CAP_SUP_WIDTH_20_40 \|
	IEEE80211_HT_CAP_GRN_FLD \|
	IEEE80211_HT_CAP_SGI_20 \|
	IEEE80211_HT_CAP_SGI_40 \|
	IEEE80211_HT_CAP_DSSSCCK40));
	/*
	* The STBC bits are asymmetric -- if we don't have
	* TX then mask out the peer's RX and vice versa.
	*/
	if (!(sband->ht_cap.cap & IEEE80211_HT_CAP_TX_STBC))
	ht_cap->cap &= ~IEEE80211_HT_CAP_RX_STBC;
	if (!(sband->ht_cap.cap & IEEE80211_HT_CAP_RX_STBC))
	ht_cap->cap &= ~IEEE80211_HT_CAP_TX_STBC;

	ampdu_info = ht_cap_ie->ampdu_params_info;
	ht_cap->ampdu_factor =
	ampdu_info & IEEE80211_HT_AMPDU_PARM_FACTOR;
	ht_cap->ampdu_density =
	(ampdu_info & IEEE80211_HT_AMPDU_PARM_DENSITY) >> 2;

	/* own MCS TX capabilities */
	tx_mcs_set_cap = sband->ht_cap.mcs.tx_params;

	/* can we TX with MCS rates? */
	if (!(tx_mcs_set_cap & IEEE80211_HT_MCS_TX_DEFINED))
	return;

	/* Counting from 0, therefore +1 */
	if (tx_mcs_set_cap & IEEE80211_HT_MCS_TX_RX_DIFF)
	max_tx_streams =
	((tx_mcs_set_cap & IEEE80211_HT_MCS_TX_MAX_STREAMS_MASK)
	>> IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT) + 1;
	else
	max_tx_streams = IEEE80211_HT_MCS_TX_MAX_STREAMS;

	/*
	* 802.11n D5.0 20.3.5 / 20.6 says:
	* - indices 0 to 7 and 32 are single spatial stream
	* - 8 to 31 are multiple spatial streams using equal modulation
	* [8..15 for two streams, 16..23 for three and 24..31 for four]
	* - remainder are multiple spatial streams using unequal modulation
	*/
	for (i = 0; i < max_tx_streams; i++)
	ht_cap->mcs.rx_mask[i] =
	sband->ht_cap.mcs.rx_mask[i] & ht_cap_ie->mcs.rx_mask[i];

	if (tx_mcs_set_cap & IEEE80211_HT_MCS_TX_UNEQUAL_MODULATION)
	for (i = IEEE80211_HT_MCS_UNEQUAL_MODULATION_START_BYTE;
	i < IEEE80211_HT_MCS_MASK_LEN; i++)
	ht_cap->mcs.rx_mask[i] =
	sband->ht_cap.mcs.rx_mask[i] &
	ht_cap_ie->mcs.rx_mask[i];

	/* handle MCS rate 32 too */
	if (sband->ht_cap.mcs.rx_mask[32/8] & ht_cap_ie->mcs.rx_mask[32/8] & 1)
	ht_cap->mcs.rx_mask[32/8] \|= 1;
	}

	void ieee80211_sta_tear_down_BA_sessions(struct sta_info *sta)
	{
	int i;

	cancel_work_sync(&sta->ampdu_mlme.work);

	for (i = 0; i < STA_TID_NUM; i++) {
	__ieee80211_stop_tx_ba_session(sta, i, WLAN_BACK_INITIATOR);
	__ieee80211_stop_rx_ba_session(sta, i, WLAN_BACK_RECIPIENT,
	WLAN_REASON_QSTA_LEAVE_QBSS);
	}
	}

	void ieee80211_ba_session_work(struct work_struct *work)
	{
	struct sta_info *sta =
	container_of(work, struct sta_info, ampdu_mlme.work);
	struct tid_ampdu_tx *tid_tx;
	int tid;

	/*
	* When this flag is set, new sessions should be
	* blocked, and existing sessions will be torn
	* down by the code that set the flag, so this
	* need not run.
	*/
	if (test_sta_flags(sta, WLAN_STA_BLOCK_BA))
	return;

	mutex_lock(&sta->ampdu_mlme.mtx);
	for (tid = 0; tid < STA_TID_NUM; tid++) {
	if (test_and_clear_bit(tid, sta->ampdu_mlme.tid_rx_timer_expired))
	___ieee80211_stop_rx_ba_session(
	sta, tid, WLAN_BACK_RECIPIENT,
	WLAN_REASON_QSTA_TIMEOUT);

	tid_tx = sta->ampdu_mlme.tid_tx[tid];
	if (!tid_tx)
	continue;

	if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state))
	ieee80211_tx_ba_session_handle_start(sta, tid);
	else if (test_and_clear_bit(HT_AGG_STATE_WANT_STOP,
	&tid_tx->state))
	___ieee80211_stop_tx_ba_session(sta, tid,
	WLAN_BACK_INITIATOR);
	}
	mutex_unlock(&sta->ampdu_mlme.mtx);
	}

	void ieee80211_send_delba(struct ieee80211_sub_if_data *sdata,
	const u8 *da, u16 tid,
	u16 initiator, u16 reason_code)
	{
	struct ieee80211_local *local = sdata->local;
	struct sk_buff *skb;
	struct ieee80211_mgmt *mgmt;
	u16 params;

	skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);

	if (!skb) {
	printk(KERN_ERR "%s: failed to allocate buffer "
	"for delba frame\n", sdata->name);
	return;
	}

	skb_reserve(skb, local->hw.extra_tx_headroom);
	mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
	memset(mgmt, 0, 24);
	memcpy(mgmt->da, da, ETH_ALEN);
	memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
	if (sdata->vif.type == NL80211_IFTYPE_AP \|\|
	sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
	memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
	else if (sdata->vif.type == NL80211_IFTYPE_STATION)
	memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN);

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

	skb_put(skb, 1 + sizeof(mgmt->u.action.u.delba));

	mgmt->u.action.category = WLAN_CATEGORY_BACK;
	mgmt->u.action.u.delba.action_code = WLAN_ACTION_DELBA;
	params = (u16)(initiator << 11); /* bit 11 initiator */
	params \|= (u16)(tid << 12); /* bit 15:12 TID number */

	mgmt->u.action.u.delba.params = cpu_to_le16(params);
	mgmt->u.action.u.delba.reason_code = cpu_to_le16(reason_code);

	ieee80211_tx_skb(sdata, skb);
	}

	void ieee80211_process_delba(struct ieee80211_sub_if_data *sdata,
	struct sta_info *sta,
	struct ieee80211_mgmt *mgmt, size_t len)
	{
	u16 tid, params;
	u16 initiator;

	params = le16_to_cpu(mgmt->u.action.u.delba.params);
	tid = (params & IEEE80211_DELBA_PARAM_TID_MASK) >> 12;
	initiator = (params & IEEE80211_DELBA_PARAM_INITIATOR_MASK) >> 11;

	#ifdef CONFIG_MAC80211_HT_DEBUG
	if (net_ratelimit())
	printk(KERN_DEBUG "delba from %pM (%s) tid %d reason code %d\n",
	mgmt->sa, initiator ? "initiator" : "recipient", tid,
	le16_to_cpu(mgmt->u.action.u.delba.reason_code));
	#endif /* CONFIG_MAC80211_HT_DEBUG */

	if (initiator == WLAN_BACK_INITIATOR)
	__ieee80211_stop_rx_ba_session(sta, tid, WLAN_BACK_INITIATOR, 0);
	else
	__ieee80211_stop_tx_ba_session(sta, tid, WLAN_BACK_RECIPIENT);
	}

	int ieee80211_send_smps_action(struct ieee80211_sub_if_data *sdata,
	enum ieee80211_smps_mode smps, const u8 *da,
	const u8 *bssid)
	{
	struct ieee80211_local *local = sdata->local;
	struct sk_buff *skb;
	struct ieee80211_mgmt *action_frame;

	/* 27 = header + category + action + smps mode */
	skb = dev_alloc_skb(27 + local->hw.extra_tx_headroom);
	if (!skb)
	return -ENOMEM;

	skb_reserve(skb, local->hw.extra_tx_headroom);
	action_frame = (void *)skb_put(skb, 27);
	memcpy(action_frame->da, da, ETH_ALEN);
	memcpy(action_frame->sa, sdata->dev->dev_addr, ETH_ALEN);
	memcpy(action_frame->bssid, bssid, ETH_ALEN);
	action_frame->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT \|
	IEEE80211_STYPE_ACTION);
	action_frame->u.action.category = WLAN_CATEGORY_HT;
	action_frame->u.action.u.ht_smps.action = WLAN_HT_ACTION_SMPS;
	switch (smps) {
	case IEEE80211_SMPS_AUTOMATIC:
	case IEEE80211_SMPS_NUM_MODES:
	WARN_ON(1);
	case IEEE80211_SMPS_OFF:
	action_frame->u.action.u.ht_smps.smps_control =
	WLAN_HT_SMPS_CONTROL_DISABLED;
	break;
	case IEEE80211_SMPS_STATIC:
	action_frame->u.action.u.ht_smps.smps_control =
	WLAN_HT_SMPS_CONTROL_STATIC;
	break;
	case IEEE80211_SMPS_DYNAMIC:
	action_frame->u.action.u.ht_smps.smps_control =
	WLAN_HT_SMPS_CONTROL_DYNAMIC;
	break;
	}

	/* we'll do more on status of this frame */
	IEEE80211_SKB_CB(skb)->flags \|= IEEE80211_TX_CTL_REQ_TX_STATUS;
	ieee80211_tx_skb(sdata, skb);

	return 0;
	}