// SPDX-License-Identifier: GPL-2.0
/******************************************************************************
 *
 * Copyright(c) 2007 - 2012 Realtek Corporation. All rights reserved.
 *
 ******************************************************************************/
#define _RTW_RECV_C_

#include <linux/ieee80211.h>
#include <linux/if_ether.h>

#include <osdep_service.h>
#include <drv_types.h>
#include <recv_osdep.h>
#include <mlme_osdep.h>
#include <mon.h>
#include <wifi.h>
#include <linux/vmalloc.h>
#include <linux/etherdevice.h>
#include <net/cfg80211.h>

#define LLC_HEADER_SIZE                 6       /*  LLC Header Length */

static u8 SNAP_ETH_TYPE_IPX[2] = {0x81, 0x37};
static u8 SNAP_ETH_TYPE_APPLETALK_AARP[2] = {0x80, 0xf3};

static void rtw_signal_stat_timer_hdl(struct timer_list *t);

void _rtw_init_sta_recv_priv(struct sta_recv_priv *psta_recvpriv)
{
        memset((u8 *)psta_recvpriv, 0, sizeof(struct sta_recv_priv));

        spin_lock_init(&psta_recvpriv->lock);

        _rtw_init_queue(&psta_recvpriv->defrag_q);
}

int _rtw_init_recv_priv(struct recv_priv *precvpriv, struct adapter *padapter)
{
        int i;

        struct recv_frame *precvframe;

        int     res = _SUCCESS;

        _rtw_init_queue(&precvpriv->free_recv_queue);
        _rtw_init_queue(&precvpriv->recv_pending_queue);
        _rtw_init_queue(&precvpriv->uc_swdec_pending_queue);

        precvpriv->adapter = padapter;

        precvpriv->pallocated_frame_buf = vzalloc(NR_RECVFRAME * sizeof(struct recv_frame) + RXFRAME_ALIGN_SZ);

        if (!precvpriv->pallocated_frame_buf)
                return _FAIL;

        precvframe = PTR_ALIGN(precvpriv->pallocated_frame_buf, RXFRAME_ALIGN_SZ);

        for (i = 0; i < NR_RECVFRAME; i++) {
                INIT_LIST_HEAD(&precvframe->list);

                list_add_tail(&precvframe->list,
                              &precvpriv->free_recv_queue.queue);

                precvframe->pkt = NULL;

                precvframe->adapter = padapter;
                precvframe++;
        }
        res = rtw_hal_init_recv_priv(padapter);

        timer_setup(&precvpriv->signal_stat_timer, rtw_signal_stat_timer_hdl,
                    0);

        precvpriv->signal_stat_sampling_interval = 1000; /* ms */

        rtw_set_signal_stat_timer(precvpriv);

        return res;
}

void _rtw_free_recv_priv(struct recv_priv *precvpriv)
{
        struct adapter  *padapter = precvpriv->adapter;

        rtw_free_uc_swdec_pending_queue(padapter);

        vfree(precvpriv->pallocated_frame_buf);

        rtw_hal_free_recv_priv(padapter);
}

struct recv_frame *_rtw_alloc_recvframe(struct __queue *pfree_recv_queue)
{
        struct recv_frame *hdr;

        hdr = list_first_entry_or_null(&pfree_recv_queue->queue,
                                       struct recv_frame, list);
        if (hdr)
                list_del_init(&hdr->list);

        return hdr;
}

struct recv_frame *rtw_alloc_recvframe(struct __queue *pfree_recv_queue)
{
        struct recv_frame  *precvframe;

        spin_lock_bh(&pfree_recv_queue->lock);

        precvframe = _rtw_alloc_recvframe(pfree_recv_queue);

        spin_unlock_bh(&pfree_recv_queue->lock);

        return precvframe;
}

void rtw_free_recvframe(struct recv_frame *precvframe, struct __queue *pfree_recv_queue)
{
        if (!precvframe)
                return;

        if (precvframe->pkt) {
                dev_kfree_skb_any(precvframe->pkt);/* free skb by driver */
                precvframe->pkt = NULL;
        }

        spin_lock_bh(&pfree_recv_queue->lock);

        list_del_init(&precvframe->list);

        list_add_tail(&precvframe->list, get_list_head(pfree_recv_queue));

        spin_unlock_bh(&pfree_recv_queue->lock);
}

int _rtw_enqueue_recvframe(struct recv_frame *precvframe, struct __queue *queue)
{
        list_del_init(&precvframe->list);
        list_add_tail(&precvframe->list, get_list_head(queue));

        return _SUCCESS;
}

int rtw_enqueue_recvframe(struct recv_frame *precvframe, struct __queue *queue)
{
        int ret;

        spin_lock_bh(&queue->lock);
        ret = _rtw_enqueue_recvframe(precvframe, queue);
        spin_unlock_bh(&queue->lock);

        return ret;
}

/*
 * caller : defrag ; recvframe_chk_defrag in recv_thread  (passive)
 * pframequeue: defrag_queue : will be accessed in recv_thread  (passive)
 *
 * using spinlock to protect
 *
 */

void rtw_free_recvframe_queue(struct __queue *pframequeue,  struct __queue *pfree_recv_queue)
{
        struct recv_frame *hdr;
        struct list_head *plist, *phead;

        spin_lock(&pframequeue->lock);

        phead = get_list_head(pframequeue);
        plist = phead->next;

        while (phead != plist) {
                hdr = list_entry(plist, struct recv_frame, list);

                plist = plist->next;

                rtw_free_recvframe(hdr, pfree_recv_queue);
        }

        spin_unlock(&pframequeue->lock);
}

u32 rtw_free_uc_swdec_pending_queue(struct adapter *adapter)
{
        u32 cnt = 0;
        struct recv_frame *pending_frame;

        while ((pending_frame = rtw_alloc_recvframe(&adapter->recvpriv.uc_swdec_pending_queue))) {
                rtw_free_recvframe(pending_frame, &adapter->recvpriv.free_recv_queue);
                cnt++;
        }

        return cnt;
}

static int recvframe_chkmic(struct adapter *adapter,
                            struct recv_frame *precvframe)
{
        int     i, res = _SUCCESS;
        u32     datalen;
        u8      miccode[8];
        u8      bmic_err = false, brpt_micerror = true;
        u8      *pframe, *payload, *pframemic;
        u8      *mickey;
        struct  sta_info                *stainfo;
        struct  rx_pkt_attrib   *prxattrib = &precvframe->attrib;
        struct  security_priv   *psecuritypriv = &adapter->securitypriv;

        struct mlme_ext_priv    *pmlmeext = &adapter->mlmeextpriv;
        struct mlme_ext_info    *pmlmeinfo = &pmlmeext->mlmext_info;

        stainfo = rtw_get_stainfo(&adapter->stapriv, &prxattrib->ta[0]);

        if (prxattrib->encrypt == _TKIP_) {
                /* calculate mic code */
                if (stainfo) {
                        if (is_multicast_ether_addr(prxattrib->ra)) {
                                if (!psecuritypriv) {
                                        res = _FAIL;
                                        goto exit;
                                }
                                mickey = &psecuritypriv->dot118021XGrprxmickey[prxattrib->key_index].skey[0];
                        } else {
                                mickey = &stainfo->dot11tkiprxmickey.skey[0];
                        }

                        /* icv_len included the mic code */
                        datalen = precvframe->pkt->len - prxattrib->hdrlen -
                                  prxattrib->iv_len - prxattrib->icv_len - 8;
                        pframe = precvframe->pkt->data;
                        payload = pframe + prxattrib->hdrlen + prxattrib->iv_len;

                        rtw_seccalctkipmic(mickey, pframe, payload, datalen, &miccode[0],
                                           (unsigned char)prxattrib->priority); /* care the length of the data */

                        pframemic = payload + datalen;

                        bmic_err = false;

                        for (i = 0; i < 8; i++) {
                                if (miccode[i] != *(pframemic + i))
                                        bmic_err = true;
                        }

                        if (bmic_err) {
                                /*  double check key_index for some timing issue , */
                                /*  cannot compare with psecuritypriv->dot118021XGrpKeyid also cause timing issue */
                                if (is_multicast_ether_addr(prxattrib->ra) && prxattrib->key_index != pmlmeinfo->key_index)
                                        brpt_micerror = false;

                                if ((prxattrib->bdecrypted) && (brpt_micerror))
                                        rtw_handle_tkip_mic_err(adapter, (u8)is_multicast_ether_addr(prxattrib->ra));
                                res = _FAIL;
                        } else {
                                /* mic checked ok */
                                if (!psecuritypriv->bcheck_grpkey &&
                                    is_multicast_ether_addr(prxattrib->ra))
                                        psecuritypriv->bcheck_grpkey = true;
                        }
                }

                skb_trim(precvframe->pkt, precvframe->pkt->len - 8);
        }

exit:

        return res;
}

/* decrypt and set the ivlen, icvlen of the recv_frame */
static struct recv_frame *decryptor(struct adapter *padapter,
                                    struct recv_frame *precv_frame)
{
        struct rx_pkt_attrib *prxattrib = &precv_frame->attrib;
        struct security_priv *psecuritypriv = &padapter->securitypriv;
        struct recv_frame *return_packet = precv_frame;
        u32      res = _SUCCESS;

        if (prxattrib->encrypt > 0) {
                u8 *iv = precv_frame->pkt->data + prxattrib->hdrlen;

                prxattrib->key_index = (((iv[3]) >> 6) & 0x3);

                if (prxattrib->key_index > WEP_KEYS) {
                        switch (prxattrib->encrypt) {
                        case _WEP40_:
                        case _WEP104_:
                                prxattrib->key_index = psecuritypriv->dot11PrivacyKeyIndex;
                                break;
                        case _TKIP_:
                        case _AES_:
                        default:
                                prxattrib->key_index = psecuritypriv->dot118021XGrpKeyid;
                                break;
                        }
                }
        }

        if ((prxattrib->encrypt > 0) && (prxattrib->bdecrypted == 0)) {
                psecuritypriv->hw_decrypted = false;

                switch (prxattrib->encrypt) {
                case _WEP40_:
                case _WEP104_:
                        res = rtw_wep_decrypt(padapter, precv_frame);
                        break;
                case _TKIP_:
                        res = rtw_tkip_decrypt(padapter, precv_frame);
                        break;
                case _AES_:
                        res = rtw_aes_decrypt(padapter, precv_frame);
                        break;
                default:
                        break;
                }
        } else if (prxattrib->bdecrypted == 1 && prxattrib->encrypt > 0 &&
                   (psecuritypriv->busetkipkey == 1 || prxattrib->encrypt != _TKIP_))
                        psecuritypriv->hw_decrypted = true;

        if (res == _FAIL) {
                rtw_free_recvframe(return_packet, &padapter->recvpriv.free_recv_queue);
                return_packet = NULL;
        }

        return return_packet;
}

/* set the security information in the recv_frame */
static struct recv_frame *portctrl(struct adapter *adapter,
                                   struct recv_frame *precv_frame)
{
        u8   *psta_addr, *ptr;
        uint  auth_alg;
        struct recv_frame *pfhdr;
        struct sta_info *psta;
        struct sta_priv *pstapriv;
        struct recv_frame *prtnframe;
        u16     ether_type;
        u16  eapol_type = 0x888e;/* for Funia BD's WPA issue */
        struct rx_pkt_attrib *pattrib;
        __be16 be_tmp;

        pstapriv = &adapter->stapriv;

        auth_alg = adapter->securitypriv.dot11AuthAlgrthm;

        ptr = precv_frame->pkt->data;
        pfhdr = precv_frame;
        pattrib = &pfhdr->attrib;
        psta_addr = pattrib->ta;
        psta = rtw_get_stainfo(pstapriv, psta_addr);

        prtnframe = NULL;

        if (auth_alg == 2) {
                /* get ether_type */
                ptr = ptr + pfhdr->attrib.hdrlen + LLC_HEADER_SIZE + pfhdr->attrib.iv_len;
                memcpy(&be_tmp, ptr, 2);
                ether_type = ntohs(be_tmp);

                if (psta && (psta->ieee8021x_blocked)) {
                        /* blocked */
                        /* only accept EAPOL frame */
                        if (ether_type == eapol_type) {
                                prtnframe = precv_frame;
                        } else {
                                /* free this frame */
                                rtw_free_recvframe(precv_frame, &adapter->recvpriv.free_recv_queue);
                                prtnframe = NULL;
                        }
                } else {
                        /* allowed */
                        /* check decryption status, and decrypt the frame if needed */
                        prtnframe = precv_frame;
                        /* check is the EAPOL frame or not (Rekey) */
                        if (ether_type == eapol_type)
                                /* check Rekey */
                                prtnframe = precv_frame;
                }
        } else {
                prtnframe = precv_frame;
        }

        return prtnframe;
}

static int recv_decache(struct recv_frame *precv_frame, u8 bretry,
                        struct stainfo_rxcache *prxcache)
{
        int tid = precv_frame->attrib.priority;

        u16 seq_ctrl = ((precv_frame->attrib.seq_num & 0xffff) << 4) |
                (precv_frame->attrib.frag_num & 0xf);

        if (tid > 15)
                return _FAIL;

        if (seq_ctrl == prxcache->tid_rxseq[tid])
                return _FAIL;

        prxcache->tid_rxseq[tid] = seq_ctrl;

        return _SUCCESS;
}

static void process_pwrbit_data(struct adapter *padapter,
                                struct recv_frame *precv_frame)
{
#ifdef CONFIG_88EU_AP_MODE
        unsigned char pwrbit;
        u8 *ptr = precv_frame->pkt->data;
        struct rx_pkt_attrib *pattrib = &precv_frame->attrib;
        struct sta_priv *pstapriv = &padapter->stapriv;
        struct sta_info *psta = NULL;

        psta = rtw_get_stainfo(pstapriv, pattrib->src);

        pwrbit = GetPwrMgt(ptr);

        if (psta) {
                if (pwrbit) {
                        if (!(psta->state & WIFI_SLEEP_STATE))
                                stop_sta_xmit(padapter, psta);
                } else {
                        if (psta->state & WIFI_SLEEP_STATE)
                                wakeup_sta_to_xmit(padapter, psta);
                }
        }

#endif
}

static void process_wmmps_data(struct adapter *padapter,
                               struct recv_frame *precv_frame)
{
#ifdef CONFIG_88EU_AP_MODE
        struct rx_pkt_attrib *pattrib = &precv_frame->attrib;
        struct sta_priv *pstapriv = &padapter->stapriv;
        struct sta_info *psta = NULL;

        psta = rtw_get_stainfo(pstapriv, pattrib->src);

        if (!psta)
                return;

        if (!psta->qos_option)
                return;

        if (!(psta->qos_info & 0xf))
                return;

        if (psta->state & WIFI_SLEEP_STATE) {
                u8 wmmps_ac = 0;

                switch (pattrib->priority) {
                case 1:
                case 2:
                        wmmps_ac = psta->uapsd_bk & BIT(1);
                        break;
                case 4:
                case 5:
                        wmmps_ac = psta->uapsd_vi & BIT(1);
                        break;
                case 6:
                case 7:
                        wmmps_ac = psta->uapsd_vo & BIT(1);
                        break;
                case 0:
                case 3:
                default:
                        wmmps_ac = psta->uapsd_be & BIT(1);
                        break;
                }

                if (wmmps_ac) {
                        if (psta->sleepq_ac_len > 0) {
                                /* process received triggered frame */
                                xmit_delivery_enabled_frames(padapter, psta);
                        } else {
                                /* issue one qos null frame with More data bit = 0 and the EOSP bit set (= 1) */
                                issue_qos_nulldata(padapter, psta->hwaddr, (u16)pattrib->priority, 0, 0);
                        }
                }
        }

#endif
}

static void count_rx_stats(struct adapter *padapter,
                           struct recv_frame *prframe,
                           struct sta_info *sta)
{
        int     sz;
        struct sta_info         *psta = NULL;
        struct stainfo_stats    *pstats = NULL;
        struct rx_pkt_attrib    *pattrib = &prframe->attrib;
        struct recv_priv        *precvpriv = &padapter->recvpriv;

        sz = prframe->pkt->len;
        precvpriv->rx_bytes += sz;

        padapter->mlmepriv.LinkDetectInfo.NumRxOkInPeriod++;

        if (!is_multicast_ether_addr(pattrib->dst))
                padapter->mlmepriv.LinkDetectInfo.NumRxUnicastOkInPeriod++;

        if (sta)
                psta = sta;
        else
                psta = prframe->psta;

        if (psta) {
                pstats = &psta->sta_stats;

                pstats->rx_data_pkts++;
                pstats->rx_bytes += sz;
        }
}

static int sta2sta_data_frame(struct adapter *adapter,
                              struct recv_frame *precv_frame,
                              struct sta_info **psta)
{
        int ret = _SUCCESS;
        struct rx_pkt_attrib *pattrib = &precv_frame->attrib;
        struct  sta_priv *pstapriv = &adapter->stapriv;
        struct  mlme_priv *pmlmepriv = &adapter->mlmepriv;
        u8 *mybssid  = get_bssid(pmlmepriv);
        u8 *myhwaddr = myid(&adapter->eeprompriv);
        u8 *sta_addr = NULL;
        bool mcast = is_multicast_ether_addr(pattrib->dst);

        if (check_fwstate(pmlmepriv, WIFI_ADHOC_STATE) ||
            check_fwstate(pmlmepriv, WIFI_ADHOC_MASTER_STATE)) {
                /*  filter packets that SA is myself or multicast or broadcast */
                if (!memcmp(myhwaddr, pattrib->src, ETH_ALEN)) {
                        ret = _FAIL;
                        goto exit;
                }

                if (memcmp(myhwaddr, pattrib->dst, ETH_ALEN) && !mcast) {
                        ret = _FAIL;
                        goto exit;
                }

                if (is_zero_ether_addr(pattrib->bssid) ||
                    is_zero_ether_addr(mybssid) ||
                    memcmp(pattrib->bssid, mybssid, ETH_ALEN)) {
                        ret = _FAIL;
                        goto exit;
                }

                sta_addr = pattrib->src;
        } else if (check_fwstate(pmlmepriv, WIFI_STATION_STATE)) {
                /*  For Station mode, sa and bssid should always be BSSID, and DA is my mac-address */
                if (memcmp(pattrib->bssid, pattrib->src, ETH_ALEN)) {
                        ret = _FAIL;
                        goto exit;
                }
                sta_addr = pattrib->bssid;
        } else if (check_fwstate(pmlmepriv, WIFI_AP_STATE)) {
                if (mcast) {
                        /*  For AP mode, if DA == MCAST, then BSSID should be also MCAST */
                        if (!is_multicast_ether_addr(pattrib->bssid)) {
                                ret = _FAIL;
                                goto exit;
                        }
                } else { /*  not mc-frame */
                        /*  For AP mode, if DA is non-MCAST, then it must be BSSID, and bssid == BSSID */
                        if (memcmp(pattrib->bssid, pattrib->dst, ETH_ALEN)) {
                                ret = _FAIL;
                                goto exit;
                        }

                        sta_addr = pattrib->src;
                }
        } else {
                ret  = _FAIL;
        }

        if (mcast)
                *psta = rtw_get_bcmc_stainfo(adapter);
        else
                *psta = rtw_get_stainfo(pstapriv, sta_addr); /*  get ap_info */

        if (!*psta) {
                ret = _FAIL;
                goto exit;
        }

exit:
        return ret;
}

static int ap2sta_data_frame(struct adapter *adapter,
                             struct recv_frame *precv_frame,
                             struct sta_info **psta)
{
        u8 *ptr = precv_frame->pkt->data;
        struct rx_pkt_attrib *pattrib = &precv_frame->attrib;
        int ret = _SUCCESS;
        struct  sta_priv *pstapriv = &adapter->stapriv;
        struct  mlme_priv *pmlmepriv = &adapter->mlmepriv;
        u8 *mybssid  = get_bssid(pmlmepriv);
        u8 *myhwaddr = myid(&adapter->eeprompriv);
        bool mcast = is_multicast_ether_addr(pattrib->dst);

        if (check_fwstate(pmlmepriv, WIFI_STATION_STATE) &&
            (check_fwstate(pmlmepriv, _FW_LINKED) ||
             check_fwstate(pmlmepriv, _FW_UNDER_LINKING))) {
                /*  filter packets that SA is myself or multicast or broadcast */
                if (!memcmp(myhwaddr, pattrib->src, ETH_ALEN)) {
                        ret = _FAIL;
                        goto exit;
                }

                /*  da should be for me */
                if (memcmp(myhwaddr, pattrib->dst, ETH_ALEN) && !mcast) {
                        ret = _FAIL;
                        goto exit;
                }

                /*  check BSSID */
                if (is_zero_ether_addr(pattrib->bssid) ||
                    is_zero_ether_addr(mybssid) ||
                    (memcmp(pattrib->bssid, mybssid, ETH_ALEN))) {
                        if (!mcast)
                                issue_deauth(adapter, pattrib->bssid, WLAN_REASON_CLASS3_FRAME_FROM_NONASSOC_STA);

                        ret = _FAIL;
                        goto exit;
                }

                if (mcast)
                        *psta = rtw_get_bcmc_stainfo(adapter);
                else
                        *psta = rtw_get_stainfo(pstapriv, pattrib->bssid); /*  get ap_info */

                if (!*psta) {
                        ret = _FAIL;
                        goto exit;
                }

                /* if ((GetFrameSubType(ptr) & WIFI_QOS_DATA_TYPE) == WIFI_QOS_DATA_TYPE) { */
                /*  */

                if (GetFrameSubType(ptr) & BIT(6)) {
                        /* No data, will not indicate to upper layer, temporily count it here */
                        count_rx_stats(adapter, precv_frame, *psta);
                        ret = RTW_RX_HANDLED;
                        goto exit;
                }
        } else if (check_fwstate(pmlmepriv, WIFI_AP_STATE)) {
                /* Special case */
                ret = RTW_RX_HANDLED;
                goto exit;
        } else {
                if (!memcmp(myhwaddr, pattrib->dst, ETH_ALEN) && !mcast) {
                        *psta = rtw_get_stainfo(pstapriv, pattrib->bssid); /*  get sta_info */
                        if (!*psta)
                                issue_deauth(adapter, pattrib->bssid, WLAN_REASON_CLASS3_FRAME_FROM_NONASSOC_STA);
                }

                ret = _FAIL;
        }

exit:

        return ret;
}

static int sta2ap_data_frame(struct adapter *adapter,
                             struct recv_frame *precv_frame,
                             struct sta_info **psta)
{
        struct rx_pkt_attrib *pattrib = &precv_frame->attrib;
        struct  sta_priv *pstapriv = &adapter->stapriv;
        struct  mlme_priv *pmlmepriv = &adapter->mlmepriv;
        u8 *ptr = precv_frame->pkt->data;
        unsigned char *mybssid  = get_bssid(pmlmepriv);
        int ret = _SUCCESS;

        if (check_fwstate(pmlmepriv, WIFI_AP_STATE)) {
                /* For AP mode, RA = BSSID, TX = STA(SRC_ADDR), A3 = DST_ADDR */
                if (memcmp(pattrib->bssid, mybssid, ETH_ALEN)) {
                        ret = _FAIL;
                        goto exit;
                }

                *psta = rtw_get_stainfo(pstapriv, pattrib->src);
                if (!*psta) {
                        issue_deauth(adapter, pattrib->src, WLAN_REASON_CLASS3_FRAME_FROM_NONASSOC_STA);

                        ret = RTW_RX_HANDLED;
                        goto exit;
                }

                process_pwrbit_data(adapter, precv_frame);

                if ((GetFrameSubType(ptr) & WIFI_QOS_DATA_TYPE) == WIFI_QOS_DATA_TYPE)
                        process_wmmps_data(adapter, precv_frame);

                if (GetFrameSubType(ptr) & BIT(6)) {
                        /* No data, will not indicate to upper layer, temporily count it here */
                        count_rx_stats(adapter, precv_frame, *psta);
                        ret = RTW_RX_HANDLED;
                        goto exit;
                }
        } else {
                u8 *myhwaddr = myid(&adapter->eeprompriv);

                if (memcmp(pattrib->ra, myhwaddr, ETH_ALEN)) {
                        ret = RTW_RX_HANDLED;
                        goto exit;
                }
                issue_deauth(adapter, pattrib->src, WLAN_REASON_CLASS3_FRAME_FROM_NONASSOC_STA);
                ret = RTW_RX_HANDLED;
                goto exit;
        }

exit:

        return ret;
}

static int validate_recv_ctrl_frame(struct adapter *padapter,
                                    struct recv_frame *precv_frame)
{
#ifdef CONFIG_88EU_AP_MODE
        struct rx_pkt_attrib *pattrib = &precv_frame->attrib;
        struct sta_priv *pstapriv = &padapter->stapriv;
        u8 *pframe = precv_frame->pkt->data;

        if (GetFrameType(pframe) != WIFI_CTRL_TYPE)
                return _FAIL;

        /* receive the frames that ra(a1) is my address */
        if (memcmp(GetAddr1Ptr(pframe), myid(&padapter->eeprompriv), ETH_ALEN))
                return _FAIL;

        /* only handle ps-poll */
        if (GetFrameSubType(pframe) == (IEEE80211_FTYPE_CTL | IEEE80211_STYPE_PSPOLL)) {
                u16 aid;
                u8 wmmps_ac = 0;
                struct sta_info *psta = NULL;

                aid = GetAid(pframe);
                psta = rtw_get_stainfo(pstapriv, GetAddr2Ptr(pframe));

                if ((!psta) || (psta->aid != aid))
                        return _FAIL;

                /* for rx pkt statistics */
                psta->sta_stats.rx_ctrl_pkts++;

                switch (pattrib->priority) {
                case 1:
                case 2:
                        wmmps_ac = psta->uapsd_bk & BIT(0);
                        break;
                case 4:
                case 5:
                        wmmps_ac = psta->uapsd_vi & BIT(0);
                        break;
                case 6:
                case 7:
                        wmmps_ac = psta->uapsd_vo & BIT(0);
                        break;
                case 0:
                case 3:
                default:
                        wmmps_ac = psta->uapsd_be & BIT(0);
                        break;
                }

                if (wmmps_ac)
                        return _FAIL;

                if (psta->state & WIFI_STA_ALIVE_CHK_STATE) {
                        psta->expire_to = pstapriv->expire_to;
                        psta->state ^= WIFI_STA_ALIVE_CHK_STATE;
                }

                if ((psta->state & WIFI_SLEEP_STATE) && (pstapriv->sta_dz_bitmap & BIT(psta->aid))) {
                        struct list_head *xmitframe_plist, *xmitframe_phead;
                        struct xmit_frame *pxmitframe = NULL;

                        spin_lock_bh(&psta->sleep_q.lock);

                        xmitframe_phead = get_list_head(&psta->sleep_q);
                        xmitframe_plist = xmitframe_phead->next;

                        if (xmitframe_phead != xmitframe_plist) {
                                pxmitframe = list_entry(xmitframe_plist, struct xmit_frame, list);

                                xmitframe_plist = xmitframe_plist->next;

                                list_del_init(&pxmitframe->list);

                                psta->sleepq_len--;

                                if (psta->sleepq_len > 0)
                                        pxmitframe->attrib.mdata = 1;
                                else
                                        pxmitframe->attrib.mdata = 0;

                                pxmitframe->attrib.triggered = 1;

                                spin_unlock_bh(&psta->sleep_q.lock);
                                if (rtw_hal_xmit(padapter, pxmitframe))
                                        rtw_os_xmit_complete(padapter, pxmitframe);
                                spin_lock_bh(&psta->sleep_q.lock);

                                if (psta->sleepq_len == 0) {
                                        pstapriv->tim_bitmap &= ~BIT(psta->aid);

                                        /* update BCN for TIM IE */
                                        /* update_BCNTIM(padapter); */
                                        update_beacon(padapter, WLAN_EID_TIM, NULL, false);
                                }
                        } else {
                                if (pstapriv->tim_bitmap & BIT(psta->aid)) {
                                        if (psta->sleepq_len == 0)
                                                /* issue nulldata with More data bit = 0 to indicate we have no buffered packets */
                                                issue_nulldata(padapter, psta->hwaddr, 0, 0, 0);
                                        else
                                                psta->sleepq_len = 0;

                                        pstapriv->tim_bitmap &= ~BIT(psta->aid);

                                        /* update BCN for TIM IE */
                                        /* update_BCNTIM(padapter); */
                                        update_beacon(padapter, WLAN_EID_TIM, NULL, false);
                                }
                        }

                        spin_unlock_bh(&psta->sleep_q.lock);
                }
        }

#endif

        return _FAIL;
}

struct recv_frame *recvframe_chk_defrag(struct adapter *padapter,
                                        struct recv_frame *precv_frame);

static int validate_recv_mgnt_frame(struct adapter *padapter,
                                    struct recv_frame *precv_frame)
{
        struct sta_info *psta;

        precv_frame = recvframe_chk_defrag(padapter, precv_frame);
        if (!precv_frame)
                return _SUCCESS;

        /* for rx pkt statistics */
        psta = rtw_get_stainfo(&padapter->stapriv,
                               GetAddr2Ptr(precv_frame->pkt->data));
        if (psta) {
                psta->sta_stats.rx_mgnt_pkts++;
                if (GetFrameSubType(precv_frame->pkt->data) == IEEE80211_STYPE_BEACON) {
                        psta->sta_stats.rx_beacon_pkts++;
                } else if (GetFrameSubType(precv_frame->pkt->data) == IEEE80211_STYPE_PROBE_REQ) {
                        psta->sta_stats.rx_probereq_pkts++;
                } else if (GetFrameSubType(precv_frame->pkt->data) == IEEE80211_STYPE_PROBE_RESP) {
                        if (!memcmp(padapter->eeprompriv.mac_addr,
                                    GetAddr1Ptr(precv_frame->pkt->data), ETH_ALEN))
                                psta->sta_stats.rx_probersp_pkts++;
                        else if (is_multicast_ether_addr(GetAddr1Ptr(precv_frame->pkt->data)))
                                psta->sta_stats.rx_probersp_bm_pkts++;
                        else
                                psta->sta_stats.rx_probersp_uo_pkts++;
                }
        }

        mgt_dispatcher(padapter, precv_frame);

        return _SUCCESS;
}

static int validate_recv_data_frame(struct adapter *adapter,
                                    struct recv_frame *precv_frame)
{
        u8 bretry;
        u8 *psa, *pda, *pbssid;
        struct sta_info *psta = NULL;
        u8 *ptr = precv_frame->pkt->data;
        struct rx_pkt_attrib    *pattrib = &precv_frame->attrib;
        struct security_priv    *psecuritypriv = &adapter->securitypriv;
        int ret = _SUCCESS;

        bretry = GetRetry(ptr);
        pda = ieee80211_get_DA((struct ieee80211_hdr *)ptr);
        psa = ieee80211_get_SA((struct ieee80211_hdr *)ptr);
        pbssid = get_hdr_bssid(ptr);

        if (!pbssid) {
                ret = _FAIL;
                goto exit;
        }

        memcpy(pattrib->dst, pda, ETH_ALEN);
        memcpy(pattrib->src, psa, ETH_ALEN);

        memcpy(pattrib->bssid, pbssid, ETH_ALEN);

        switch (pattrib->to_fr_ds) {
        case 0:
                memcpy(pattrib->ra, pda, ETH_ALEN);
                memcpy(pattrib->ta, psa, ETH_ALEN);
                ret = sta2sta_data_frame(adapter, precv_frame, &psta);
                break;
        case 1:
                memcpy(pattrib->ra, pda, ETH_ALEN);
                memcpy(pattrib->ta, pbssid, ETH_ALEN);
                ret = ap2sta_data_frame(adapter, precv_frame, &psta);
                break;
        case 2:
                memcpy(pattrib->ra, pbssid, ETH_ALEN);
                memcpy(pattrib->ta, psa, ETH_ALEN);
                ret = sta2ap_data_frame(adapter, precv_frame, &psta);
                break;
        case 3:
                memcpy(pattrib->ra, GetAddr1Ptr(ptr), ETH_ALEN);
                memcpy(pattrib->ta, GetAddr2Ptr(ptr), ETH_ALEN);
                ret = _FAIL;
                break;
        default:
                ret = _FAIL;
                break;
        }

        if (ret == _FAIL)
                goto exit;
        else if (ret == RTW_RX_HANDLED)
                goto exit;

        if (!psta) {
                ret = _FAIL;
                goto exit;
        }

        /* psta->rssi = prxcmd->rssi; */
        /* psta->signal_quality = prxcmd->sq; */
        precv_frame->psta = psta;

        pattrib->amsdu = 0;
        pattrib->ack_policy = 0;
        /* parsing QC field */
        if (pattrib->qos == 1) {
                pattrib->priority = GetPriority((ptr + 24));
                pattrib->ack_policy = GetAckpolicy((ptr + 24));
                pattrib->amsdu = GetAMsdu((ptr + 24));
                pattrib->hdrlen = pattrib->to_fr_ds == 3 ? 32 : 26;

                if (pattrib->priority != 0 && pattrib->priority != 3)
                        adapter->recvpriv.bIsAnyNonBEPkts = true;
        } else {
                pattrib->priority = 0;
                pattrib->hdrlen = pattrib->to_fr_ds == 3 ? 30 : 24;
        }

        if (pattrib->order)/* HT-CTRL 11n */
                pattrib->hdrlen += 4;

        precv_frame->preorder_ctrl = &psta->recvreorder_ctrl[pattrib->priority];

        /*  decache, drop duplicate recv packets */
        if (recv_decache(precv_frame, bretry, &psta->sta_recvpriv.rxcache) == _FAIL) {
                ret = _FAIL;
                goto exit;
        }

        if (pattrib->privacy) {
                GET_ENCRY_ALGO(psecuritypriv, psta, pattrib->encrypt, is_multicast_ether_addr(pattrib->ra));
                SET_ICE_IV_LEN(pattrib->iv_len, pattrib->icv_len, pattrib->encrypt);
        } else {
                pattrib->encrypt = 0;
                pattrib->iv_len = 0;
                pattrib->icv_len = 0;
        }

exit:

        return ret;
}

static int validate_recv_frame(struct adapter *adapter,
                               struct recv_frame *precv_frame)
{
        /* shall check frame subtype, to / from ds, da, bssid */

        /* then call check if rx seq/frag. duplicated. */

        u8 type;
        u8 subtype;

        int retval = _SUCCESS;
        u8 bDumpRxPkt;
        struct rx_pkt_attrib *pattrib = &precv_frame->attrib;
        u8 *ptr = precv_frame->pkt->data;
        u8  ver = (unsigned char)(*ptr) & 0x3;
        struct mlme_ext_priv *pmlmeext = &adapter->mlmeextpriv;

        if (pmlmeext->sitesurvey_res.state == SCAN_PROCESS) {
                int ch_set_idx = rtw_ch_set_search_ch(pmlmeext->channel_set, rtw_get_oper_ch(adapter));

                if (ch_set_idx >= 0)
                        pmlmeext->channel_set[ch_set_idx].rx_count++;
        }

        /* add version chk */
        if (ver != 0) {
                retval = _FAIL;
                goto exit;
        }

        type =  GetFrameType(ptr);
        subtype = GetFrameSubType(ptr); /* bit(7)~bit(2) */

        pattrib->to_fr_ds = get_tofr_ds(ptr);

        pattrib->frag_num = GetFragNum(ptr);
        pattrib->seq_num = GetSequence(ptr);

        pattrib->pw_save = GetPwrMgt(ptr);
        pattrib->mfrag = GetMFrag(ptr);
        pattrib->mdata = GetMData(ptr);
        pattrib->privacy = GetPrivacy(ptr);
        pattrib->order = GetOrder(ptr);

        rtw_hal_get_def_var(adapter, HAL_DEF_DBG_DUMP_RXPKT, &(bDumpRxPkt));
        switch (type) {
        case WIFI_MGT_TYPE: /* mgnt */
                retval = validate_recv_mgnt_frame(adapter, precv_frame);
                retval = _FAIL; /*  only data frame return _SUCCESS */
                break;
        case WIFI_CTRL_TYPE: /* ctrl */
                retval = validate_recv_ctrl_frame(adapter, precv_frame);
                retval = _FAIL; /*  only data frame return _SUCCESS */
                break;
        case WIFI_DATA_TYPE: /* data */
                led_control_8188eu(adapter, LED_CTL_RX);
                pattrib->qos = (subtype & BIT(7)) ? 1 : 0;
                retval = validate_recv_data_frame(adapter, precv_frame);
                if (retval == _FAIL) {
                        struct recv_priv *precvpriv = &adapter->recvpriv;

                        precvpriv->rx_drop++;
                }
                break;
        default:
                retval = _FAIL;
                break;
        }

        /*
         * This is the last moment before management and control frames get
         * discarded. So we need to forward them to the monitor now or never.
         *
         * At the same time data frames can still be encrypted if software
         * decryption is in use. However, decryption can occur not until later
         * (see recv_func()).
         *
         * Hence forward the frame to the monitor anyway to preserve the order
         * in which frames were received.
         */
        rtl88eu_mon_recv_hook(adapter->pmondev, precv_frame);

exit:

        return retval;
}

/* remove the wlanhdr and add the eth_hdr */

static int wlanhdr_to_ethhdr(struct recv_frame *precvframe)
{
        int     rmv_len;
        u16     eth_type, len;
        __be16 be_tmp;
        u8      bsnaphdr;
        u8      *psnap_type;
        struct ieee80211_snap_hdr       *psnap;

        u8 *ptr = precvframe->pkt->data;
        struct rx_pkt_attrib *pattrib = &precvframe->attrib;

        if (pattrib->encrypt)
                skb_trim(precvframe->pkt, precvframe->pkt->len - pattrib->icv_len);

        psnap = (struct ieee80211_snap_hdr *)(ptr + pattrib->hdrlen + pattrib->iv_len);
        psnap_type = ptr + pattrib->hdrlen + pattrib->iv_len + SNAP_SIZE;
        /* convert hdr + possible LLC headers into Ethernet header */
        if ((!memcmp(psnap, rfc1042_header, SNAP_SIZE) &&
             memcmp(psnap_type, SNAP_ETH_TYPE_IPX, 2) &&
             memcmp(psnap_type, SNAP_ETH_TYPE_APPLETALK_AARP, 2)) ||
             !memcmp(psnap, bridge_tunnel_header, SNAP_SIZE)) {
                /* remove RFC1042 or Bridge-Tunnel encapsulation and replace EtherType */
                bsnaphdr = true;
        } else {
                /* Leave Ethernet header part of hdr and full payload */
                bsnaphdr = false;
        }

        rmv_len = pattrib->hdrlen + pattrib->iv_len + (bsnaphdr ? SNAP_SIZE : 0);
        len = precvframe->pkt->len - rmv_len;

        memcpy(&be_tmp, ptr + rmv_len, 2);
        eth_type = ntohs(be_tmp); /* pattrib->ether_type */
        pattrib->eth_type = eth_type;

        ptr = skb_pull(precvframe->pkt, rmv_len - sizeof(struct ethhdr) + (bsnaphdr ? 2 : 0));
        if (!ptr)
                return _FAIL;

        memcpy(ptr, pattrib->dst, ETH_ALEN);
        memcpy(ptr + ETH_ALEN, pattrib->src, ETH_ALEN);

        if (!bsnaphdr) {
                be_tmp = htons(len);
                memcpy(ptr + 12, &be_tmp, 2);
        }

        return _SUCCESS;
}

/* perform defrag */
static struct recv_frame *recvframe_defrag(struct adapter *adapter,
                                           struct __queue *defrag_q)
{
        struct list_head *plist, *phead;
        u8 wlanhdr_offset;
        u8      curfragnum;
        struct recv_frame *pnfhdr;
        struct recv_frame *prframe, *pnextrframe;
        struct __queue *pfree_recv_queue;

        curfragnum = 0;
        pfree_recv_queue = &adapter->recvpriv.free_recv_queue;

        phead = get_list_head(defrag_q);
        plist = phead->next;
        prframe = list_entry(plist, struct recv_frame, list);
        list_del_init(&prframe->list);

        if (curfragnum != prframe->attrib.frag_num) {
                /* the first fragment number must be 0 */
                /* free the whole queue */
                rtw_free_recvframe(prframe, pfree_recv_queue);
                rtw_free_recvframe_queue(defrag_q, pfree_recv_queue);

                return NULL;
        }

        curfragnum++;

        plist = get_list_head(defrag_q);

        plist = plist->next;

        while (phead != plist) {
                pnfhdr = list_entry(plist, struct recv_frame, list);
                pnextrframe = pnfhdr;

                /* check the fragment sequence  (2nd ~n fragment frame) */

                if (curfragnum != pnfhdr->attrib.frag_num) {
                        /* the fragment number must be increasing  (after decache) */
                        /* release the defrag_q & prframe */
                        rtw_free_recvframe(prframe, pfree_recv_queue);
                        rtw_free_recvframe_queue(defrag_q, pfree_recv_queue);
                        return NULL;
                }

                curfragnum++;

                /* copy the 2nd~n fragment frame's payload to the first fragment */
                /* get the 2nd~last fragment frame's payload */

                wlanhdr_offset = pnfhdr->attrib.hdrlen + pnfhdr->attrib.iv_len;

                skb_pull(pnextrframe->pkt, wlanhdr_offset);

                /* append  to first fragment frame's tail (if privacy frame, pull the ICV) */
                skb_trim(prframe->pkt, prframe->pkt->len - prframe->attrib.icv_len);

                skb_put_data(prframe->pkt, pnfhdr->pkt->data, pnfhdr->pkt->len);

                prframe->attrib.icv_len = pnfhdr->attrib.icv_len;
                plist = plist->next;
        }

        /* free the defrag_q queue and return the prframe */
        rtw_free_recvframe_queue(defrag_q, pfree_recv_queue);

        return prframe;
}

/* check if need to defrag, if needed queue the frame to defrag_q */
struct recv_frame *recvframe_chk_defrag(struct adapter *padapter,
                                        struct recv_frame *precv_frame)
{
        u8      ismfrag;
        u8      fragnum;
        u8      *psta_addr;
        struct recv_frame *pfhdr;
        struct sta_info *psta;
        struct sta_priv *pstapriv;
        struct list_head *phead;
        struct recv_frame *prtnframe = NULL;
        struct __queue *pfree_recv_queue, *pdefrag_q;

        pstapriv = &padapter->stapriv;

        pfhdr = precv_frame;

        pfree_recv_queue = &padapter->recvpriv.free_recv_queue;

        /* need to define struct of wlan header frame ctrl */
        ismfrag = pfhdr->attrib.mfrag;
        fragnum = pfhdr->attrib.frag_num;

        psta_addr = pfhdr->attrib.ta;
        psta = rtw_get_stainfo(pstapriv, psta_addr);
        if (!psta) {
                u8 type = GetFrameType(pfhdr->pkt->data);

                if (type != WIFI_DATA_TYPE) {
                        psta = rtw_get_bcmc_stainfo(padapter);
                        pdefrag_q = &psta->sta_recvpriv.defrag_q;
                } else {
                        pdefrag_q = NULL;
                }
        } else {
                pdefrag_q = &psta->sta_recvpriv.defrag_q;
        }

        if ((ismfrag == 0) && (fragnum == 0))
                prtnframe = precv_frame;/* isn't a fragment frame */

        if (ismfrag == 1) {
                /* 0~(n-1) fragment frame */
                /* enqueue to defraf_g */
                if (pdefrag_q) {
                        if (fragnum == 0) {
                                /* the first fragment */
                                if (!list_empty(&pdefrag_q->queue))
                                        /* free current defrag_q */
                                        rtw_free_recvframe_queue(pdefrag_q, pfree_recv_queue);
                        }

                        /* Then enqueue the 0~(n-1) fragment into the defrag_q */

                        phead = get_list_head(pdefrag_q);
                        list_add_tail(&pfhdr->list, phead);

                        prtnframe = NULL;
                } else {
                        /* can't find this ta's defrag_queue, so free this recv_frame */
                        rtw_free_recvframe(precv_frame, pfree_recv_queue);
                        prtnframe = NULL;
                }
        }

        if ((ismfrag == 0) && (fragnum != 0)) {
                /* the last fragment frame */
                /* enqueue the last fragment */
                if (pdefrag_q) {
                        phead = get_list_head(pdefrag_q);
                        list_add_tail(&pfhdr->list, phead);

                        /* call recvframe_defrag to defrag */
                        precv_frame = recvframe_defrag(padapter, pdefrag_q);
                        prtnframe = precv_frame;
                } else {
                        /* can't find this ta's defrag_queue, so free this recv_frame */
                        rtw_free_recvframe(precv_frame, pfree_recv_queue);
                        prtnframe = NULL;
                }
        }

        if (prtnframe && (prtnframe->attrib.privacy)) {
                /* after defrag we must check tkip mic code */
                if (recvframe_chkmic(padapter,  prtnframe) == _FAIL) {
                        rtw_free_recvframe(prtnframe, pfree_recv_queue);
                        prtnframe = NULL;
                }
        }

        return prtnframe;
}

static int amsdu_to_msdu(struct adapter *padapter, struct recv_frame *prframe)
{
        int     a_len, padding_len;
        u16     eth_type, nSubframe_Length;
        u8      nr_subframes, i;
        unsigned char *pdata;
        struct rx_pkt_attrib *pattrib;
        struct sk_buff *sub_skb, *subframes[MAX_SUBFRAME_COUNT];
        struct recv_priv *precvpriv = &padapter->recvpriv;
        struct __queue *pfree_recv_queue = &precvpriv->free_recv_queue;

        nr_subframes = 0;
        pattrib = &prframe->attrib;

        skb_pull(prframe->pkt, prframe->attrib.hdrlen);

        if (prframe->attrib.iv_len > 0)
                skb_pull(prframe->pkt, prframe->attrib.iv_len);

        a_len = prframe->pkt->len;

        pdata = prframe->pkt->data;

        while (a_len > ETH_HLEN) {
                /* Offset 12 denote 2 mac address */
                nSubframe_Length = get_unaligned_be16(pdata + 12);

                if (a_len < (ETH_HLEN + nSubframe_Length))
                        goto exit;

                /* move the data point to data content */
                pdata += ETH_HLEN;
                a_len -= ETH_HLEN;

                /* Allocate new skb for releasing to upper layer */
                sub_skb = dev_alloc_skb(nSubframe_Length + 12);
                if (!sub_skb)
                        break;

                skb_reserve(sub_skb, 12);
                skb_put_data(sub_skb, pdata, nSubframe_Length);

                subframes[nr_subframes++] = sub_skb;

                if (nr_subframes >= MAX_SUBFRAME_COUNT)
                        break;

                pdata += nSubframe_Length;
                a_len -= nSubframe_Length;
                if (a_len != 0) {
                        padding_len = 4 - ((nSubframe_Length + ETH_HLEN) & (4 - 1));
                        if (padding_len == 4)
                                padding_len = 0;

                        if (a_len < padding_len)
                                goto exit;

                        pdata += padding_len;
                        a_len -= padding_len;
                }
        }

        for (i = 0; i < nr_subframes; i++) {
                sub_skb = subframes[i];
                /* convert hdr + possible LLC headers into Ethernet header */
                eth_type = get_unaligned_be16(&sub_skb->data[6]);
                if (sub_skb->len >= 8 &&
                    ((!memcmp(sub_skb->data, rfc1042_header, SNAP_SIZE) &&
                          eth_type != ETH_P_AARP && eth_type != ETH_P_IPX) ||
                         !memcmp(sub_skb->data, bridge_tunnel_header, SNAP_SIZE))) {
                        /* remove RFC1042 or Bridge-Tunnel encapsulation and replace EtherType */
                        skb_pull(sub_skb, SNAP_SIZE);
                        memcpy(skb_push(sub_skb, ETH_ALEN), pattrib->src, ETH_ALEN);
                        memcpy(skb_push(sub_skb, ETH_ALEN), pattrib->dst, ETH_ALEN);
                } else {
                        __be16 len;
                        /* Leave Ethernet header part of hdr and full payload */
                        len = htons(sub_skb->len);
                        memcpy(skb_push(sub_skb, 2), &len, 2);
                        memcpy(skb_push(sub_skb, ETH_ALEN), pattrib->src, ETH_ALEN);
                        memcpy(skb_push(sub_skb, ETH_ALEN), pattrib->dst, ETH_ALEN);
                }

                /* Indicate the packets to upper layer */
                /*  Insert NAT2.5 RX here! */
                sub_skb->protocol = eth_type_trans(sub_skb, padapter->pnetdev);
                sub_skb->dev = padapter->pnetdev;

                sub_skb->ip_summed = CHECKSUM_NONE;

                netif_rx(sub_skb);
        }

exit:
        rtw_free_recvframe(prframe, pfree_recv_queue);/* free this recv_frame */

        return _SUCCESS;
}

static int check_indicate_seq(struct recv_reorder_ctrl *preorder_ctrl, u16 seq_num)
{
        u8      wsize = preorder_ctrl->wsize_b;
        u16     wend = (preorder_ctrl->indicate_seq + wsize - 1) & 0xFFF;/*  4096; */

        /*  Rx Reorder initialize condition. */
        if (preorder_ctrl->indicate_seq == 0xFFFF)
                preorder_ctrl->indicate_seq = seq_num;

        /*  Drop out the packet which SeqNum is smaller than WinStart */
        if (SN_LESS(seq_num, preorder_ctrl->indicate_seq))
                return false;

        /*  */
        /*  Sliding window manipulation. Conditions includes: */
        /*  1. Incoming SeqNum is equal to WinStart =>Window shift 1 */
        /*  2. Incoming SeqNum is larger than the WinEnd => Window shift N */
        /*  */
        if (SN_EQUAL(seq_num, preorder_ctrl->indicate_seq)) {
                preorder_ctrl->indicate_seq = (preorder_ctrl->indicate_seq + 1) & 0xFFF;
        } else if (SN_LESS(wend, seq_num)) {
                if (seq_num >= (wsize - 1))
                        preorder_ctrl->indicate_seq = seq_num + 1 - wsize;
                else
                        preorder_ctrl->indicate_seq = 0xFFF - (wsize - (seq_num + 1)) + 1;
        }

        return true;
}

static int enqueue_reorder_recvframe(struct recv_reorder_ctrl *preorder_ctrl,
                                     struct recv_frame *prframe)
{
        struct rx_pkt_attrib *pattrib = &prframe->attrib;
        struct __queue *ppending_recvframe_queue = &preorder_ctrl->pending_recvframe_queue;
        struct list_head *phead, *plist;
        struct recv_frame *hdr;
        struct rx_pkt_attrib *pnextattrib;

        phead = get_list_head(ppending_recvframe_queue);
        plist = phead->next;

        while (phead != plist) {
                hdr = list_entry(plist, struct recv_frame, list);
                pnextattrib = &hdr->attrib;

                if (SN_LESS(pnextattrib->seq_num, pattrib->seq_num))
                        plist = plist->next;
                else if (SN_EQUAL(pnextattrib->seq_num, pattrib->seq_num))
                        return false;
                else
                        break;
        }

        list_del_init(&prframe->list);

        list_add_tail(&prframe->list, plist);
        return true;
}

static int recv_indicatepkts_in_order(struct adapter *padapter, struct recv_reorder_ctrl *preorder_ctrl, int bforced)
{
        struct list_head *phead, *plist;
        struct recv_frame *prframe;
        struct recv_frame *prhdr;
        struct rx_pkt_attrib *pattrib;
        int bPktInBuf = false;
        struct recv_priv *precvpriv = &padapter->recvpriv;
        struct __queue *ppending_recvframe_queue = &preorder_ctrl->pending_recvframe_queue;

        phead =         get_list_head(ppending_recvframe_queue);
        plist = phead->next;

        /*  Handling some condition for forced indicate case. */
        if (bforced) {
                if (list_empty(phead))
                        return true;

                prhdr = list_entry(plist, struct recv_frame, list);
                pattrib = &prhdr->attrib;
                preorder_ctrl->indicate_seq = pattrib->seq_num;
        }

        /*  Prepare indication list and indication. */
        /*  Check if there is any packet need indicate. */
        while (!list_empty(phead)) {
                prhdr = list_entry(plist, struct recv_frame, list);
                prframe = prhdr;
                pattrib = &prframe->attrib;

                if (!SN_LESS(preorder_ctrl->indicate_seq, pattrib->seq_num)) {
                        plist = plist->next;
                        list_del_init(&prframe->list);

                        if (SN_EQUAL(preorder_ctrl->indicate_seq, pattrib->seq_num))
                                preorder_ctrl->indicate_seq = (preorder_ctrl->indicate_seq + 1) & 0xFFF;

                        /* Set this as a lock to make sure that only one thread is indicating packet. */

                        /* indicate this recv_frame */
                        if (!pattrib->amsdu) {
                                if ((!padapter->bDriverStopped) &&
                                    (!padapter->bSurpriseRemoved))
                                        rtw_recv_indicatepkt(padapter, prframe);/* indicate this recv_frame */
                        } else if (pattrib->amsdu == 1) {
                                if (amsdu_to_msdu(padapter, prframe) != _SUCCESS)
                                        rtw_free_recvframe(prframe, &precvpriv->free_recv_queue);
                        } else {
                                /* error condition; */
                        }

                        /* Update local variables. */
                        bPktInBuf = false;
                } else {
                        bPktInBuf = true;
                        break;
                }
        }
        return bPktInBuf;
}

static int recv_indicatepkt_reorder(struct adapter *padapter,
                                    struct recv_frame *prframe)
{
        int retval = _SUCCESS;
        struct rx_pkt_attrib *pattrib = &prframe->attrib;
        struct recv_reorder_ctrl *preorder_ctrl = prframe->preorder_ctrl;
        struct __queue *ppending_recvframe_queue = &preorder_ctrl->pending_recvframe_queue;

        if (!pattrib->amsdu) {
                /* s1. */
                wlanhdr_to_ethhdr(prframe);

                if ((pattrib->qos != 1) || (pattrib->eth_type == 0x0806) ||
                    (pattrib->ack_policy != 0)) {
                        if ((!padapter->bDriverStopped) &&
                            (!padapter->bSurpriseRemoved)) {
                                rtw_recv_indicatepkt(padapter, prframe);
                                return _SUCCESS;
                        }

                        return _FAIL;
                }

                if (!preorder_ctrl->enable) {
                        /* indicate this recv_frame */
                        preorder_ctrl->indicate_seq = pattrib->seq_num;
                        rtw_recv_indicatepkt(padapter, prframe);

                        preorder_ctrl->indicate_seq =
                                (preorder_ctrl->indicate_seq + 1) % 4096;
                        return _SUCCESS;
                }
        } else if (pattrib->amsdu == 1) { /* temp filter -> means didn't support A-MSDUs in a A-MPDU */
                if (!preorder_ctrl->enable) {
                        preorder_ctrl->indicate_seq = pattrib->seq_num;
                        retval = amsdu_to_msdu(padapter, prframe);

                        preorder_ctrl->indicate_seq =
                                (preorder_ctrl->indicate_seq + 1) % 4096;
                        return retval;
                }
        }

        spin_lock_bh(&ppending_recvframe_queue->lock);

        /* s2. check if winstart_b(indicate_seq) needs to been updated */
        if (!check_indicate_seq(preorder_ctrl, pattrib->seq_num)) {
                rtw_recv_indicatepkt(padapter, prframe);

                spin_unlock_bh(&ppending_recvframe_queue->lock);

                goto _success_exit;
        }

        /* s3. Insert all packet into Reorder Queue to maintain its ordering. */
        if (!enqueue_reorder_recvframe(preorder_ctrl, prframe))
                goto _err_exit;

        /* s4. */
        /*  Indication process. */
        /*  After Packet dropping and Sliding Window shifting as above, we can now just indicate the packets */
        /*  with the SeqNum smaller than latest WinStart and buffer other packets. */
        /*  */
        /*  For Rx Reorder condition: */
        /*  1. All packets with SeqNum smaller than WinStart => Indicate */
        /*  2. All packets with SeqNum larger than or equal to WinStart => Buffer it. */
        /*  */

        /* recv_indicatepkts_in_order(padapter, preorder_ctrl, true); */
        if (recv_indicatepkts_in_order(padapter, preorder_ctrl, false)) {
                mod_timer(&preorder_ctrl->reordering_ctrl_timer,
                          jiffies + msecs_to_jiffies(REORDER_WAIT_TIME));
                spin_unlock_bh(&ppending_recvframe_queue->lock);
        } else {
                spin_unlock_bh(&ppending_recvframe_queue->lock);
                del_timer_sync(&preorder_ctrl->reordering_ctrl_timer);
        }

_success_exit:

        return _SUCCESS;

_err_exit:

        spin_unlock_bh(&ppending_recvframe_queue->lock);

        return _FAIL;
}

void rtw_reordering_ctrl_timeout_handler(struct timer_list *t)
{
        struct recv_reorder_ctrl *preorder_ctrl = from_timer(preorder_ctrl, t,
                                                           reordering_ctrl_timer);
        struct adapter *padapter = preorder_ctrl->padapter;
        struct __queue *ppending_recvframe_queue = &preorder_ctrl->pending_recvframe_queue;

        if (padapter->bDriverStopped || padapter->bSurpriseRemoved)
                return;

        spin_lock_bh(&ppending_recvframe_queue->lock);

        if (recv_indicatepkts_in_order(padapter, preorder_ctrl, true))
                mod_timer(&preorder_ctrl->reordering_ctrl_timer,
                          jiffies + msecs_to_jiffies(REORDER_WAIT_TIME));

        spin_unlock_bh(&ppending_recvframe_queue->lock);
}

static int process_recv_indicatepkts(struct adapter *padapter,
                                     struct recv_frame *prframe)
{
        int retval = _SUCCESS;
        struct mlme_priv        *pmlmepriv = &padapter->mlmepriv;
        struct ht_priv  *phtpriv = &pmlmepriv->htpriv;

        if (phtpriv->ht_option) {  /* B/G/N Mode */
                if (recv_indicatepkt_reorder(padapter, prframe) != _SUCCESS) {
                        /*  including perform A-MPDU Rx Ordering Buffer Control */
                        if ((!padapter->bDriverStopped) &&
                            (!padapter->bSurpriseRemoved)) {
                                return _FAIL;
                        }
                }
        } else { /* B/G mode */
                retval = wlanhdr_to_ethhdr(prframe);
                if (retval != _SUCCESS)
                        return retval;

                if ((!padapter->bDriverStopped) &&
                    (!padapter->bSurpriseRemoved))
                        /* indicate this recv_frame */
                        rtw_recv_indicatepkt(padapter, prframe);
                else
                        return _FAIL;
        }

        return retval;
}

static int recv_func_prehandle(struct adapter *padapter,
                               struct recv_frame *rframe)
{
        int ret = _SUCCESS;
        struct __queue *pfree_recv_queue = &padapter->recvpriv.free_recv_queue;

        /* check the frame crtl field and decache */
        ret = validate_recv_frame(padapter, rframe);
        if (ret != _SUCCESS) {
                rtw_free_recvframe(rframe, pfree_recv_queue);/* free this recv_frame */
                goto exit;
        }

exit:
        return ret;
}

static int recv_func_posthandle(struct adapter *padapter,
                                struct recv_frame *prframe)
{
        int ret = _SUCCESS;
        struct recv_frame *orig_prframe = prframe;
        struct recv_priv *precvpriv = &padapter->recvpriv;
        struct __queue *pfree_recv_queue = &padapter->recvpriv.free_recv_queue;

        /*  DATA FRAME */
        led_control_8188eu(padapter, LED_CTL_RX);

        prframe = decryptor(padapter, prframe);
        if (!prframe) {
                ret = _FAIL;
                goto _recv_data_drop;
        }

        prframe = recvframe_chk_defrag(padapter, prframe);
        if (!prframe)
                goto _recv_data_drop;

        prframe = portctrl(padapter, prframe);
        if (!prframe) {
                ret = _FAIL;
                goto _recv_data_drop;
        }

        count_rx_stats(padapter, prframe, NULL);

        ret = process_recv_indicatepkts(padapter, prframe);
        if (ret != _SUCCESS) {
                rtw_free_recvframe(orig_prframe, pfree_recv_queue);/* free this recv_frame */
                goto _recv_data_drop;
        }
        return ret;

_recv_data_drop:
        precvpriv->rx_drop++;
        return ret;
}

static int recv_func(struct adapter *padapter, struct recv_frame *rframe)
{
        int ret;
        struct rx_pkt_attrib *prxattrib = &rframe->attrib;
        struct security_priv *psecuritypriv = &padapter->securitypriv;
        struct mlme_priv *mlmepriv = &padapter->mlmepriv;

        /* check if need to handle uc_swdec_pending_queue*/
        if (check_fwstate(mlmepriv, WIFI_STATION_STATE) && psecuritypriv->busetkipkey) {
                struct recv_frame *pending_frame;

                while ((pending_frame = rtw_alloc_recvframe(&padapter->recvpriv.uc_swdec_pending_queue)))
                        recv_func_posthandle(padapter, pending_frame);
        }

        ret = recv_func_prehandle(padapter, rframe);

        if (ret == _SUCCESS) {
                /* check if need to enqueue into uc_swdec_pending_queue*/
                if (check_fwstate(mlmepriv, WIFI_STATION_STATE) &&
                    !is_multicast_ether_addr(prxattrib->ra) &&
                    prxattrib->encrypt > 0 &&
                    prxattrib->bdecrypted == 0 &&
                    !is_wep_enc(psecuritypriv->dot11PrivacyAlgrthm) &&
                    !psecuritypriv->busetkipkey) {
                        rtw_enqueue_recvframe(rframe, &padapter->recvpriv.uc_swdec_pending_queue);
                        goto exit;
                }

                ret = recv_func_posthandle(padapter, rframe);
        }

exit:
        return ret;
}

int rtw_recv_entry(struct recv_frame *precvframe)
{
        struct adapter *padapter = precvframe->adapter;
        struct recv_priv *precvpriv = &padapter->recvpriv;
        int ret;

        ret = recv_func(padapter, precvframe);
        if (ret == _SUCCESS)
                precvpriv->rx_pkts++;

        return ret;
}

static void rtw_signal_stat_timer_hdl(struct timer_list *t)
{
        struct adapter *adapter =
                from_timer(adapter, t, recvpriv.signal_stat_timer);
        struct recv_priv *recvpriv = &adapter->recvpriv;

        u32 tmp_s, tmp_q;
        u8 avg_signal_strength = 0;
        u8 avg_signal_qual = 0;
        u8 _alpha = 3; /*  this value is based on converging_constant = 5000 and sampling_interval = 1000 */

        if (recvpriv->signal_strength_data.update_req == 0) {
                /* update_req is clear, means we got rx */
                avg_signal_strength = recvpriv->signal_strength_data.avg_val;
                /* after avg_vals are acquired, we can re-stat the signal
                 * values
                 */
                recvpriv->signal_strength_data.update_req = 1;
        }

        if (recvpriv->signal_qual_data.update_req == 0) {
                /* update_req is clear, means we got rx */
                avg_signal_qual = recvpriv->signal_qual_data.avg_val;
                /* after avg_vals are acquired, we can re-stat the signal
                 * values
                 */
                recvpriv->signal_qual_data.update_req = 1;
        }

        /* update value of signal_strength, rssi, signal_qual */
        if (!check_fwstate(&adapter->mlmepriv, _FW_UNDER_SURVEY)) {
                tmp_s = avg_signal_strength +
                        (_alpha - 1) * recvpriv->signal_strength;
                tmp_s = DIV_ROUND_UP(tmp_s, _alpha);
                if (tmp_s > 100)
                        tmp_s = 100;

                tmp_q = avg_signal_qual +
                        (_alpha - 1) * recvpriv->signal_qual;
                tmp_q = DIV_ROUND_UP(tmp_q, _alpha);
                if (tmp_q > 100)
                        tmp_q = 100;

                recvpriv->signal_strength = tmp_s;
                recvpriv->rssi = (s8)translate_percentage_to_dbm(tmp_s);
                recvpriv->signal_qual = tmp_q;
        }

        rtw_set_signal_stat_timer(recvpriv);
}