mac80211: restructure HT code

	wep.o \

	wpa.o \

	scan.o \

	ht.o \

	ht.o agg-tx.o agg-rx.o \

	mlme.o \

	iface.o \

	rate.o \

/*

 * 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"

void ieee80211_sta_stop_rx_ba_session(struct ieee80211_sub_if_data *sdata, u8 *ra, u16 tid,

					u16 initiator, u16 reason)

{

	struct ieee80211_local *local = sdata->local;

	struct ieee80211_hw *hw = &local->hw;

	struct sta_info *sta;

	int ret, i;

	rcu_read_lock();

	sta = sta_info_get(local, ra);

	if (!sta) {

		rcu_read_unlock();

		return;

	}

	/* check if TID is in operational state */

	spin_lock_bh(&sta->lock);

	if (sta->ampdu_mlme.tid_state_rx[tid]

				!= HT_AGG_STATE_OPERATIONAL) {

		spin_unlock_bh(&sta->lock);

		rcu_read_unlock();

		return;

	}

	sta->ampdu_mlme.tid_state_rx[tid] =

		HT_AGG_STATE_REQ_STOP_BA_MSK |

		(initiator << HT_AGG_STATE_INITIATOR_SHIFT);

	spin_unlock_bh(&sta->lock);

	/* stop HW Rx aggregation. ampdu_action existence

	 * already verified in session init so we add the BUG_ON */

	BUG_ON(!local->ops->ampdu_action);

#ifdef CONFIG_MAC80211_HT_DEBUG

	printk(KERN_DEBUG "Rx BA session stop requested for %pM tid %u\n",

	       ra, tid);

#endif /* CONFIG_MAC80211_HT_DEBUG */

	ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_RX_STOP,

				       &sta->sta, tid, NULL);

	if (ret)

		printk(KERN_DEBUG "HW problem - can not stop rx "

				"aggregation for tid %d\n", tid);

	/* shutdown timer has not expired */

	if (initiator != WLAN_BACK_TIMER)

		del_timer_sync(&sta->ampdu_mlme.tid_rx[tid]->session_timer);

	/* check if this is a self generated aggregation halt */

	if (initiator == WLAN_BACK_RECIPIENT || initiator == WLAN_BACK_TIMER)

		ieee80211_send_delba(sdata, ra, tid, 0, reason);

	/* free the reordering buffer */

	for (i = 0; i < sta->ampdu_mlme.tid_rx[tid]->buf_size; i++) {

		if (sta->ampdu_mlme.tid_rx[tid]->reorder_buf[i]) {

			/* release the reordered frames */

			dev_kfree_skb(sta->ampdu_mlme.tid_rx[tid]->reorder_buf[i]);

			sta->ampdu_mlme.tid_rx[tid]->stored_mpdu_num--;

			sta->ampdu_mlme.tid_rx[tid]->reorder_buf[i] = NULL;

		}

	}

	/* free resources */

	kfree(sta->ampdu_mlme.tid_rx[tid]->reorder_buf);

	kfree(sta->ampdu_mlme.tid_rx[tid]);

	sta->ampdu_mlme.tid_rx[tid] = NULL;

	sta->ampdu_mlme.tid_state_rx[tid] = HT_AGG_STATE_IDLE;

	rcu_read_unlock();

}

/*

 * After accepting the AddBA Request we activated a timer,

 * resetting it after each frame that arrives from the originator.

 * if this timer expires ieee80211_sta_stop_rx_ba_session will be executed.

 */

static void sta_rx_agg_session_timer_expired(unsigned long data)

{

	/* not an elegant detour, but there is no choice as the timer passes

	 * only one argument, and various sta_info are needed here, so init

	 * flow in sta_info_create gives the TID as data, while the timer_to_id

	 * array gives the sta through container_of */

	u8 *ptid = (u8 *)data;

	u8 *timer_to_id = ptid - *ptid;

	struct sta_info *sta = container_of(timer_to_id, struct sta_info,

					 timer_to_tid[0]);

#ifdef CONFIG_MAC80211_HT_DEBUG

	printk(KERN_DEBUG "rx session timer expired on tid %d\n", (u16)*ptid);

#endif

	ieee80211_sta_stop_rx_ba_session(sta->sdata, sta->sta.addr,

					 (u16)*ptid, WLAN_BACK_TIMER,

					 WLAN_REASON_QSTA_TIMEOUT);

}

static void ieee80211_send_addba_resp(struct ieee80211_sub_if_data *sdata, u8 *da, u16 tid,

				      u8 dialog_token, u16 status, u16 policy,

				      u16 buf_size, u16 timeout)

{

	struct ieee80211_if_sta *ifsta = &sdata->u.sta;

	struct ieee80211_local *local = sdata->local;

	struct sk_buff *skb;

	struct ieee80211_mgmt *mgmt;

	u16 capab;

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

	if (!skb) {

		printk(KERN_DEBUG "%s: failed to allocate buffer "

		       "for addba resp frame\n", sdata->dev->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->dev->dev_addr, ETH_ALEN);

	if (sdata->vif.type == NL80211_IFTYPE_AP)

		memcpy(mgmt->bssid, sdata->dev->dev_addr, ETH_ALEN);

	else

		memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);

	mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |

					  IEEE80211_STYPE_ACTION);

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

	mgmt->u.action.category = WLAN_CATEGORY_BACK;

	mgmt->u.action.u.addba_resp.action_code = WLAN_ACTION_ADDBA_RESP;

	mgmt->u.action.u.addba_resp.dialog_token = dialog_token;

	capab = (u16)(policy << 1);	/* bit 1 aggregation policy */

	capab |= (u16)(tid << 2); 	/* bit 5:2 TID number */

	capab |= (u16)(buf_size << 6);	/* bit 15:6 max size of aggregation */

	mgmt->u.action.u.addba_resp.capab = cpu_to_le16(capab);

	mgmt->u.action.u.addba_resp.timeout = cpu_to_le16(timeout);

	mgmt->u.action.u.addba_resp.status = cpu_to_le16(status);

	ieee80211_tx_skb(sdata, skb, 1);

}

void ieee80211_process_addba_request(struct ieee80211_local *local,

				     struct sta_info *sta,

				     struct ieee80211_mgmt *mgmt,

				     size_t len)

{

	struct ieee80211_hw *hw = &local->hw;

	struct ieee80211_conf *conf = &hw->conf;

	struct tid_ampdu_rx *tid_agg_rx;

	u16 capab, tid, timeout, ba_policy, buf_size, start_seq_num, status;

	u8 dialog_token;

	int ret = -EOPNOTSUPP;

	/* extract session parameters from addba request frame */

	dialog_token = mgmt->u.action.u.addba_req.dialog_token;

	timeout = le16_to_cpu(mgmt->u.action.u.addba_req.timeout);

	start_seq_num =

		le16_to_cpu(mgmt->u.action.u.addba_req.start_seq_num) >> 4;

	capab = le16_to_cpu(mgmt->u.action.u.addba_req.capab);

	ba_policy = (capab & IEEE80211_ADDBA_PARAM_POLICY_MASK) >> 1;

	tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2;

	buf_size = (capab & IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK) >> 6;

	status = WLAN_STATUS_REQUEST_DECLINED;

	/* sanity check for incoming parameters:

	 * check if configuration can support the BA policy

	 * and if buffer size does not exceeds max value */

	/* XXX: check own ht delayed BA capability?? */

	if (((ba_policy != 1)

		&& (!(sta->sta.ht_cap.cap & IEEE80211_HT_CAP_DELAY_BA)))

		|| (buf_size > IEEE80211_MAX_AMPDU_BUF)) {

		status = WLAN_STATUS_INVALID_QOS_PARAM;

#ifdef CONFIG_MAC80211_HT_DEBUG

		if (net_ratelimit())

			printk(KERN_DEBUG "AddBA Req with bad params from "

				"%pM on tid %u. policy %d, buffer size %d\n",

				mgmt->sa, tid, ba_policy,

				buf_size);

#endif /* CONFIG_MAC80211_HT_DEBUG */

		goto end_no_lock;

	}

	/* determine default buffer size */

	if (buf_size == 0) {

		struct ieee80211_supported_band *sband;

		sband = local->hw.wiphy->bands[conf->channel->band];

		buf_size = IEEE80211_MIN_AMPDU_BUF;

		buf_size = buf_size << sband->ht_cap.ampdu_factor;

	}

	/* examine state machine */

	spin_lock_bh(&sta->lock);

	if (sta->ampdu_mlme.tid_state_rx[tid] != HT_AGG_STATE_IDLE) {

#ifdef CONFIG_MAC80211_HT_DEBUG

		if (net_ratelimit())

			printk(KERN_DEBUG "unexpected AddBA Req from "

				"%pM on tid %u\n",

				mgmt->sa, tid);

#endif /* CONFIG_MAC80211_HT_DEBUG */

		goto end;

	}

	/* prepare A-MPDU MLME for Rx aggregation */

	sta->ampdu_mlme.tid_rx[tid] =

			kmalloc(sizeof(struct tid_ampdu_rx), GFP_ATOMIC);

	if (!sta->ampdu_mlme.tid_rx[tid]) {

#ifdef CONFIG_MAC80211_HT_DEBUG

		if (net_ratelimit())

			printk(KERN_ERR "allocate rx mlme to tid %d failed\n",

					tid);

#endif

		goto end;

	}

	/* rx timer */

	sta->ampdu_mlme.tid_rx[tid]->session_timer.function =

				sta_rx_agg_session_timer_expired;

	sta->ampdu_mlme.tid_rx[tid]->session_timer.data =

				(unsigned long)&sta->timer_to_tid[tid];

	init_timer(&sta->ampdu_mlme.tid_rx[tid]->session_timer);

	tid_agg_rx = sta->ampdu_mlme.tid_rx[tid];

	/* prepare reordering buffer */

	tid_agg_rx->reorder_buf =

		kcalloc(buf_size, sizeof(struct sk_buff *), GFP_ATOMIC);

	if (!tid_agg_rx->reorder_buf) {

#ifdef CONFIG_MAC80211_HT_DEBUG

		if (net_ratelimit())

			printk(KERN_ERR "can not allocate reordering buffer "

			       "to tid %d\n", tid);

#endif

		kfree(sta->ampdu_mlme.tid_rx[tid]);

		goto end;

	}

	if (local->ops->ampdu_action)

		ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_RX_START,

					       &sta->sta, tid, &start_seq_num);

#ifdef CONFIG_MAC80211_HT_DEBUG

	printk(KERN_DEBUG "Rx A-MPDU request on tid %d result %d\n", tid, ret);

#endif /* CONFIG_MAC80211_HT_DEBUG */

	if (ret) {

		kfree(tid_agg_rx->reorder_buf);

		kfree(tid_agg_rx);

		sta->ampdu_mlme.tid_rx[tid] = NULL;

		goto end;

	}

	/* change state and send addba resp */

	sta->ampdu_mlme.tid_state_rx[tid] = HT_AGG_STATE_OPERATIONAL;

	tid_agg_rx->dialog_token = dialog_token;

	tid_agg_rx->ssn = start_seq_num;

	tid_agg_rx->head_seq_num = start_seq_num;

	tid_agg_rx->buf_size = buf_size;

	tid_agg_rx->timeout = timeout;

	tid_agg_rx->stored_mpdu_num = 0;

	status = WLAN_STATUS_SUCCESS;

end:

	spin_unlock_bh(&sta->lock);

end_no_lock:

	ieee80211_send_addba_resp(sta->sdata, sta->sta.addr, tid,

				  dialog_token, status, 1, buf_size, timeout);

}