/*
 * 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.
 */

/**
 * DOC: RX A-MPDU aggregation
 *
 * Aggregation on the RX side requires only implementing the
 * @ampdu_action callback that is invoked to start/stop any
 * block-ack sessions for RX aggregation.
 *
 * When RX aggregation is started by the peer, the driver is
 * notified via @ampdu_action function, with the
 * %IEEE80211_AMPDU_RX_START action, and may reject the request
 * in which case a negative response is sent to the peer, if it
 * accepts it a positive response is sent.
 *
 * While the session is active, the device/driver are required
 * to de-aggregate frames and pass them up one by one to mac80211,
 * which will handle the reorder buffer.
 *
 * When the aggregation session is stopped again by the peer or
 * ourselves, the driver's @ampdu_action function will be called
 * with the action %IEEE80211_AMPDU_RX_STOP. In this case, the
 * call must not fail.
 */

#include <linux/ieee80211.h>
#include <linux/slab.h>
#include <linux/export.h>
#include <net/mac80211.h>
#include "ieee80211_i.h"
#include "driver-ops.h"

static void ieee80211_free_tid_rx(struct rcu_head *h)
{
        struct tid_ampdu_rx *tid_rx =
                container_of(h, struct tid_ampdu_rx, rcu_head);
        int i;

        del_timer_sync(&tid_rx->reorder_timer);

        for (i = 0; i < tid_rx->buf_size; i++)
                dev_kfree_skb(tid_rx->reorder_buf[i]);
        kfree(tid_rx->reorder_buf);
        kfree(tid_rx->reorder_time);
        kfree(tid_rx);
}

void ___ieee80211_stop_rx_ba_session(struct sta_info *sta, u16 tid,
                                     u16 initiator, u16 reason, bool tx)
{
        struct ieee80211_local *local = sta->local;
        struct tid_ampdu_rx *tid_rx;

        lockdep_assert_held(&sta->ampdu_mlme.mtx);

        tid_rx = rcu_dereference_protected(sta->ampdu_mlme.tid_rx[tid],
                                        lockdep_is_held(&sta->ampdu_mlme.mtx));

        if (!tid_rx)
                return;

        RCU_INIT_POINTER(sta->ampdu_mlme.tid_rx[tid], NULL);

        ht_dbg(sta->sdata,
               "Rx BA session stop requested for %pM tid %u %s reason: %d\n",
               sta->sta.addr, tid,
               initiator == WLAN_BACK_RECIPIENT ? "recipient" : "inititator",
               (int)reason);

        if (drv_ampdu_action(local, sta->sdata, IEEE80211_AMPDU_RX_STOP,
                             &sta->sta, tid, NULL, 0))
                sdata_info(sta->sdata,
                           "HW problem - can not stop rx aggregation for %pM tid %d\n",
                           sta->sta.addr, tid);

        /* check if this is a self generated aggregation halt */
        if (initiator == WLAN_BACK_RECIPIENT && tx)
                ieee80211_send_delba(sta->sdata, sta->sta.addr,
                                     tid, WLAN_BACK_RECIPIENT, reason);

        del_timer_sync(&tid_rx->session_timer);

        call_rcu(&tid_rx->rcu_head, ieee80211_free_tid_rx);
}

void __ieee80211_stop_rx_ba_session(struct sta_info *sta, u16 tid,
                                    u16 initiator, u16 reason, bool tx)
{
        mutex_lock(&sta->ampdu_mlme.mtx);
        ___ieee80211_stop_rx_ba_session(sta, tid, initiator, reason, tx);
        mutex_unlock(&sta->ampdu_mlme.mtx);
}

void ieee80211_stop_rx_ba_session(struct ieee80211_vif *vif, u16 ba_rx_bitmap,
                                  const u8 *addr)
{
        struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
        struct sta_info *sta;
        int i;

        rcu_read_lock();
        sta = sta_info_get_bss(sdata, addr);
        if (!sta) {
                rcu_read_unlock();
                return;
        }

        for (i = 0; i < IEEE80211_NUM_TIDS; i++)
                if (ba_rx_bitmap & BIT(i))
                        set_bit(i, sta->ampdu_mlme.tid_rx_stop_requested);

        ieee80211_queue_work(&sta->local->hw, &sta->ampdu_mlme.work);
        rcu_read_unlock();
}
EXPORT_SYMBOL(ieee80211_stop_rx_ba_session);

/*
 * After accepting the AddBA Request we activated a timer,
 * resetting it after each frame that arrives from the originator.
 */
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]);
        struct tid_ampdu_rx *tid_rx;
        unsigned long timeout;

        rcu_read_lock();
        tid_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[*ptid]);
        if (!tid_rx) {
                rcu_read_unlock();
                return;
        }

        timeout = tid_rx->last_rx + TU_TO_JIFFIES(tid_rx->timeout);
        if (time_is_after_jiffies(timeout)) {
                mod_timer(&tid_rx->session_timer, timeout);
                rcu_read_unlock();
                return;
        }
        rcu_read_unlock();

        ht_dbg(sta->sdata, "RX session timer expired on %pM tid %d\n",
               sta->sta.addr, (u16)*ptid);

        set_bit(*ptid, sta->ampdu_mlme.tid_rx_timer_expired);
        ieee80211_queue_work(&sta->local->hw, &sta->ampdu_mlme.work);
}

static void sta_rx_agg_reorder_timer_expired(unsigned long data)
{
        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]);

        rcu_read_lock();
        ieee80211_release_reorder_timeout(sta, *ptid);
        rcu_read_unlock();
}

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_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)
                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 ||
            sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
                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);
        else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
                memcpy(mgmt->bssid, sdata->u.ibss.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);
}

void ieee80211_process_addba_request(struct ieee80211_local *local,
                                     struct sta_info *sta,
                                     struct ieee80211_mgmt *mgmt,
                                     size_t len)
{
        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;

        if (test_sta_flag(sta, WLAN_STA_BLOCK_BA)) {
                ht_dbg(sta->sdata,
                       "Suspend in progress - Denying ADDBA request (%pM tid %d)\n",
                       sta->sta.addr, tid);
                goto end_no_lock;
        }

        /* 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;
                ht_dbg_ratelimited(sta->sdata,
                                   "AddBA Req with bad params from %pM on tid %u. policy %d, buffer size %d\n",
                                   mgmt->sa, tid, ba_policy, buf_size);
                goto end_no_lock;
        }
        /* determine default buffer size */
        if (buf_size == 0)
                buf_size = IEEE80211_MAX_AMPDU_BUF;

        /* make sure the size doesn't exceed the maximum supported by the hw */
        if (buf_size > local->hw.max_rx_aggregation_subframes)
                buf_size = local->hw.max_rx_aggregation_subframes;

        /* examine state machine */
        mutex_lock(&sta->ampdu_mlme.mtx);

        if (sta->ampdu_mlme.tid_rx[tid]) {
                ht_dbg_ratelimited(sta->sdata,
                                   "unexpected AddBA Req from %pM on tid %u\n",
                                   mgmt->sa, tid);

                /* delete existing Rx BA session on the same tid */
                ___ieee80211_stop_rx_ba_session(sta, tid, WLAN_BACK_RECIPIENT,
                                                WLAN_STATUS_UNSPECIFIED_QOS,
                                                false);
        }

        /* prepare A-MPDU MLME for Rx aggregation */
        tid_agg_rx = kmalloc(sizeof(struct tid_ampdu_rx), GFP_KERNEL);
        if (!tid_agg_rx)
                goto end;

        spin_lock_init(&tid_agg_rx->reorder_lock);

        /* rx timer */
        tid_agg_rx->session_timer.function = sta_rx_agg_session_timer_expired;
        tid_agg_rx->session_timer.data = (unsigned long)&sta->timer_to_tid[tid];
        init_timer_deferrable(&tid_agg_rx->session_timer);

        /* rx reorder timer */
        tid_agg_rx->reorder_timer.function = sta_rx_agg_reorder_timer_expired;
        tid_agg_rx->reorder_timer.data = (unsigned long)&sta->timer_to_tid[tid];
        init_timer(&tid_agg_rx->reorder_timer);

        /* prepare reordering buffer */
        tid_agg_rx->reorder_buf =
                kcalloc(buf_size, sizeof(struct sk_buff *), GFP_KERNEL);
        tid_agg_rx->reorder_time =
                kcalloc(buf_size, sizeof(unsigned long), GFP_KERNEL);
        if (!tid_agg_rx->reorder_buf || !tid_agg_rx->reorder_time) {
                kfree(tid_agg_rx->reorder_buf);
                kfree(tid_agg_rx->reorder_time);
                kfree(tid_agg_rx);
                goto end;
        }

        ret = drv_ampdu_action(local, sta->sdata, IEEE80211_AMPDU_RX_START,
                               &sta->sta, tid, &start_seq_num, 0);
        ht_dbg(sta->sdata, "Rx A-MPDU request on %pM tid %d result %d\n",
               sta->sta.addr, tid, ret);
        if (ret) {
                kfree(tid_agg_rx->reorder_buf);
                kfree(tid_agg_rx->reorder_time);
                kfree(tid_agg_rx);
                goto end;
        }

        /* update data */
        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;

        /* activate it for RX */
        rcu_assign_pointer(sta->ampdu_mlme.tid_rx[tid], tid_agg_rx);

        if (timeout) {
                mod_timer(&tid_agg_rx->session_timer, TU_TO_EXP_TIME(timeout));
                tid_agg_rx->last_rx = jiffies;
        }

end:
        mutex_unlock(&sta->ampdu_mlme.mtx);

end_no_lock:
        ieee80211_send_addba_resp(sta->sdata, sta->sta.addr, tid,
                                  dialog_token, status, 1, buf_size, timeout);
}