[net-next-2.6.git] / net / mac80211 / ht.c

/*
 * 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 2007-2008, 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_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;
}
Commit	Line	Data
44d414db JB	1	/*
	2	* HT handling
	3	*
	4	* Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi>
bacac545 JB	5	* Copyright 2002-2005, Instant802 Networks, Inc.
bacac545 JB	6	* Copyright 2005-2006, Devicescape Software, Inc.
44d414db JB	7	* Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
	8	* Copyright 2007, Michael Wu <flamingice@sourmilk.net>
	9	* Copyright 2007-2008, Intel Corporation
	10	*
	11	* This program is free software; you can redistribute it and/or modify
	12	* it under the terms of the GNU General Public License version 2 as
	13	* published by the Free Software Foundation.
	14	*/
	15
	16	#include <linux/ieee80211.h>
44d414db JB	17	#include <net/mac80211.h>
44d414db JB	18	#include "ieee80211_i.h"
81cb7623	19	#include "rate.h"
44d414db	20
ae5eb026 JB	21	void ieee80211_ht_cap_ie_to_sta_ht_cap(struct ieee80211_supported_band *sband,
ae5eb026 JB	22	struct ieee80211_ht_cap *ht_cap_ie,
d9fe60de	23	struct ieee80211_sta_ht_cap *ht_cap)
44d414db	24	{
ae5eb026 JB	25	u8 ampdu_info, tx_mcs_set_cap;
ae5eb026 JB	26	int i, max_tx_streams;
44d414db	27
d9fe60de	28	BUG_ON(!ht_cap);
44d414db	29
d9fe60de	30	memset(ht_cap, 0, sizeof(*ht_cap));
44d414db	31
ae5eb026 JB	32	if (!ht_cap_ie)
ae5eb026 JB	33	return;
d9fe60de	34
ae5eb026	35	ht_cap->ht_supported = true;
d9fe60de	36
9a418af5 JB	37	/*
	38	* The bits listed in this expression should be
	39	* the same for the peer and us, if the station
	40	* advertises more then we can't use those thus
	41	* we mask them out.
	42	*/
	43	ht_cap->cap = le16_to_cpu(ht_cap_ie->cap_info) &
	44	(sband->ht_cap.cap \|
	45	~(IEEE80211_HT_CAP_LDPC_CODING \|
	46	IEEE80211_HT_CAP_SUP_WIDTH_20_40 \|
	47	IEEE80211_HT_CAP_GRN_FLD \|
	48	IEEE80211_HT_CAP_SGI_20 \|
	49	IEEE80211_HT_CAP_SGI_40 \|
	50	IEEE80211_HT_CAP_DSSSCCK40));
	51	/*
	52	* The STBC bits are asymmetric -- if we don't have
	53	* TX then mask out the peer's RX and vice versa.
	54	*/
	55	if (!(sband->ht_cap.cap & IEEE80211_HT_CAP_TX_STBC))
	56	ht_cap->cap &= ~IEEE80211_HT_CAP_RX_STBC;
	57	if (!(sband->ht_cap.cap & IEEE80211_HT_CAP_RX_STBC))
	58	ht_cap->cap &= ~IEEE80211_HT_CAP_TX_STBC;
d9fe60de	59
ae5eb026 JB	60	ampdu_info = ht_cap_ie->ampdu_params_info;
	61	ht_cap->ampdu_factor =
	62	ampdu_info & IEEE80211_HT_AMPDU_PARM_FACTOR;
	63	ht_cap->ampdu_density =
	64	(ampdu_info & IEEE80211_HT_AMPDU_PARM_DENSITY) >> 2;
44d414db	65
d9fe60de JB	66	/* own MCS TX capabilities */
	67	tx_mcs_set_cap = sband->ht_cap.mcs.tx_params;
	68
d9fe60de JB	69	/* can we TX with MCS rates? */
d9fe60de JB	70	if (!(tx_mcs_set_cap & IEEE80211_HT_MCS_TX_DEFINED))
ae5eb026	71	return;
d9fe60de JB	72
	73	/* Counting from 0, therefore +1 */
	74	if (tx_mcs_set_cap & IEEE80211_HT_MCS_TX_RX_DIFF)
	75	max_tx_streams =
	76	((tx_mcs_set_cap & IEEE80211_HT_MCS_TX_MAX_STREAMS_MASK)
	77	>> IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT) + 1;
	78	else
	79	max_tx_streams = IEEE80211_HT_MCS_TX_MAX_STREAMS;
	80
	81	/*
	82	* 802.11n D5.0 20.3.5 / 20.6 says:
	83	* - indices 0 to 7 and 32 are single spatial stream
	84	* - 8 to 31 are multiple spatial streams using equal modulation
	85	* [8..15 for two streams, 16..23 for three and 24..31 for four]
	86	* - remainder are multiple spatial streams using unequal modulation
	87	*/
	88	for (i = 0; i < max_tx_streams; i++)
ae5eb026 JB	89	ht_cap->mcs.rx_mask[i] =
ae5eb026 JB	90	sband->ht_cap.mcs.rx_mask[i] & ht_cap_ie->mcs.rx_mask[i];
d9fe60de JB	91
	92	if (tx_mcs_set_cap & IEEE80211_HT_MCS_TX_UNEQUAL_MODULATION)
	93	for (i = IEEE80211_HT_MCS_UNEQUAL_MODULATION_START_BYTE;
	94	i < IEEE80211_HT_MCS_MASK_LEN; i++)
ae5eb026	95	ht_cap->mcs.rx_mask[i] =
d9fe60de	96	sband->ht_cap.mcs.rx_mask[i] &
ae5eb026	97	ht_cap_ie->mcs.rx_mask[i];
d9fe60de JB	98
d9fe60de JB	99	/* handle MCS rate 32 too */
ae5eb026 JB	100	if (sband->ht_cap.mcs.rx_mask[32/8] & ht_cap_ie->mcs.rx_mask[32/8] & 1)
	101	ht_cap->mcs.rx_mask[32/8] \|= 1;
	102	}
	103
2dace10e	104	void ieee80211_sta_tear_down_BA_sessions(struct sta_info *sta)
de1ede7a	105	{
b8695a8f	106	int i;
de1ede7a	107
0ab33703 JB	108	cancel_work_sync(&sta->ampdu_mlme.work);
0ab33703 JB	109
b8695a8f	110	for (i = 0; i < STA_TID_NUM; i++) {
849b7967 JB	111	__ieee80211_stop_tx_ba_session(sta, i, WLAN_BACK_INITIATOR);
	112	__ieee80211_stop_rx_ba_session(sta, i, WLAN_BACK_RECIPIENT,
	113	WLAN_REASON_QSTA_LEAVE_QBSS);
de1ede7a	114	}
de1ede7a JB	115	}
de1ede7a JB	116
b8695a8f JB	117	void ieee80211_send_delba(struct ieee80211_sub_if_data *sdata,
	118	const u8 *da, u16 tid,
	119	u16 initiator, u16 reason_code)
44d414db JB	120	{
44d414db JB	121	struct ieee80211_local *local = sdata->local;
44d414db JB	122	struct sk_buff *skb;
	123	struct ieee80211_mgmt *mgmt;
	124	u16 params;
	125
	126	skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);
	127
	128	if (!skb) {
	129	printk(KERN_ERR "%s: failed to allocate buffer "
47846c9b	130	"for delba frame\n", sdata->name);
44d414db JB	131	return;
	132	}
	133
	134	skb_reserve(skb, local->hw.extra_tx_headroom);
	135	mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
	136	memset(mgmt, 0, 24);
	137	memcpy(mgmt->da, da, ETH_ALEN);
47846c9b	138	memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
8abd3f9b JB	139	if (sdata->vif.type == NL80211_IFTYPE_AP \|\|
8abd3f9b JB	140	sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
47846c9b	141	memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
46900298 JB	142	else if (sdata->vif.type == NL80211_IFTYPE_STATION)
	143	memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN);
	144
44d414db JB	145	mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT \|
	146	IEEE80211_STYPE_ACTION);
	147
	148	skb_put(skb, 1 + sizeof(mgmt->u.action.u.delba));
	149
	150	mgmt->u.action.category = WLAN_CATEGORY_BACK;
	151	mgmt->u.action.u.delba.action_code = WLAN_ACTION_DELBA;
	152	params = (u16)(initiator << 11); /* bit 11 initiator */
	153	params \|= (u16)(tid << 12); /* bit 15:12 TID number */
	154
	155	mgmt->u.action.u.delba.params = cpu_to_le16(params);
	156	mgmt->u.action.u.delba.reason_code = cpu_to_le16(reason_code);
	157
62ae67be	158	ieee80211_tx_skb(sdata, skb);
44d414db JB	159	}
44d414db JB	160
de1ede7a JB	161	void ieee80211_process_delba(struct ieee80211_sub_if_data *sdata,
	162	struct sta_info *sta,
	163	struct ieee80211_mgmt *mgmt, size_t len)
	164	{
de1ede7a JB	165	u16 tid, params;
de1ede7a JB	166	u16 initiator;
de1ede7a JB	167
	168	params = le16_to_cpu(mgmt->u.action.u.delba.params);
	169	tid = (params & IEEE80211_DELBA_PARAM_TID_MASK) >> 12;
	170	initiator = (params & IEEE80211_DELBA_PARAM_INITIATOR_MASK) >> 11;
	171
	172	#ifdef CONFIG_MAC80211_HT_DEBUG
	173	if (net_ratelimit())
0c68ae26 JB	174	printk(KERN_DEBUG "delba from %pM (%s) tid %d reason code %d\n",
0c68ae26 JB	175	mgmt->sa, initiator ? "initiator" : "recipient", tid,
372362ad	176	le16_to_cpu(mgmt->u.action.u.delba.reason_code));
de1ede7a JB	177	#endif /* CONFIG_MAC80211_HT_DEBUG */
	178
	179	if (initiator == WLAN_BACK_INITIATOR)
66b0470a	180	__ieee80211_stop_rx_ba_session(sta, tid, WLAN_BACK_INITIATOR, 0);
a622ab72 JB	181	else
a622ab72 JB	182	__ieee80211_stop_tx_ba_session(sta, tid, WLAN_BACK_RECIPIENT);
de1ede7a	183	}
0f78231b JB	184
	185	int ieee80211_send_smps_action(struct ieee80211_sub_if_data *sdata,
	186	enum ieee80211_smps_mode smps, const u8 *da,
	187	const u8 *bssid)
	188	{
	189	struct ieee80211_local *local = sdata->local;
	190	struct sk_buff *skb;
	191	struct ieee80211_mgmt *action_frame;
	192
	193	/* 27 = header + category + action + smps mode */
	194	skb = dev_alloc_skb(27 + local->hw.extra_tx_headroom);
	195	if (!skb)
	196	return -ENOMEM;
	197
	198	skb_reserve(skb, local->hw.extra_tx_headroom);
	199	action_frame = (void *)skb_put(skb, 27);
	200	memcpy(action_frame->da, da, ETH_ALEN);
	201	memcpy(action_frame->sa, sdata->dev->dev_addr, ETH_ALEN);
	202	memcpy(action_frame->bssid, bssid, ETH_ALEN);
	203	action_frame->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT \|
	204	IEEE80211_STYPE_ACTION);
	205	action_frame->u.action.category = WLAN_CATEGORY_HT;
	206	action_frame->u.action.u.ht_smps.action = WLAN_HT_ACTION_SMPS;
	207	switch (smps) {
	208	case IEEE80211_SMPS_AUTOMATIC:
	209	case IEEE80211_SMPS_NUM_MODES:
	210	WARN_ON(1);
	211	case IEEE80211_SMPS_OFF:
	212	action_frame->u.action.u.ht_smps.smps_control =
	213	WLAN_HT_SMPS_CONTROL_DISABLED;
	214	break;
	215	case IEEE80211_SMPS_STATIC:
	216	action_frame->u.action.u.ht_smps.smps_control =
	217	WLAN_HT_SMPS_CONTROL_STATIC;
	218	break;
	219	case IEEE80211_SMPS_DYNAMIC:
	220	action_frame->u.action.u.ht_smps.smps_control =
	221	WLAN_HT_SMPS_CONTROL_DYNAMIC;
	222	break;
	223	}
	224
	225	/* we'll do more on status of this frame */
	226	IEEE80211_SKB_CB(skb)->flags \|= IEEE80211_TX_CTL_REQ_TX_STATUS;
	227	ieee80211_tx_skb(sdata, skb);
	228
	229	return 0;
	230	}