/*
 * Original code based Host AP (software wireless LAN access point) driver
 * for Intersil Prism2/2.5/3 - hostap.o module, common routines
 *
 * Copyright (c) 2001-2002, SSH Communications Security Corp and Jouni Malinen
 * <jkmaline@cc.hut.fi>
 * Copyright (c) 2002-2003, Jouni Malinen <jkmaline@cc.hut.fi>
 * Copyright (c) 2004, 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. See README and COPYING for
 * more details.
 ******************************************************************************

  Few modifications for Realtek's Wi-Fi drivers by
  Andrea Merello <andreamrl@tiscali.it>

  A special thanks goes to Realtek for their support !

******************************************************************************/


#include <linux/compiler.h>
//#include <linux/config.h>
#include <linux/errno.h>
#include <linux/if_arp.h>
#include <linux/in6.h>
#include <linux/in.h>
#include <linux/ip.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/netdevice.h>
#include <linux/pci.h>
#include <linux/proc_fs.h>
#include <linux/skbuff.h>
#include <linux/slab.h>
#include <linux/tcp.h>
#include <linux/types.h>
#include <linux/wireless.h>
#include <linux/etherdevice.h>
#include <asm/uaccess.h>
#include <linux/ctype.h>

#include "ieee80211.h"
#include "dot11d.h"
static inline void ieee80211_monitor_rx(struct ieee80211_device *ieee,
                                        struct sk_buff *skb,
                                        struct ieee80211_rx_stats *rx_stats)
{
        struct ieee80211_hdr_4addr *hdr =
                (struct ieee80211_hdr_4addr *)skb->data;
        u16 fc = le16_to_cpu(hdr->frame_ctl);

        skb->dev = ieee->dev;
        skb_reset_mac_header(skb);
        skb_pull(skb, ieee80211_get_hdrlen(fc));
        skb->pkt_type = PACKET_OTHERHOST;
        skb->protocol = __constant_htons(ETH_P_80211_RAW);
        memset(skb->cb, 0, sizeof(skb->cb));
        netif_rx(skb);
}


/* Called only as a tasklet (software IRQ) */
static struct ieee80211_frag_entry *
ieee80211_frag_cache_find(struct ieee80211_device *ieee, unsigned int seq,
                          unsigned int frag, u8 tid,u8 *src, u8 *dst)
{
        struct ieee80211_frag_entry *entry;
        int i;

        for (i = 0; i < IEEE80211_FRAG_CACHE_LEN; i++) {
                entry = &ieee->frag_cache[tid][i];
                if (entry->skb != NULL &&
                    time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
                        IEEE80211_DEBUG_FRAG(
                                "expiring fragment cache entry "
                                "seq=%u last_frag=%u\n",
                                entry->seq, entry->last_frag);
                        dev_kfree_skb_any(entry->skb);
                        entry->skb = NULL;
                }

                if (entry->skb != NULL && entry->seq == seq &&
                    (entry->last_frag + 1 == frag || frag == -1) &&
                    memcmp(entry->src_addr, src, ETH_ALEN) == 0 &&
                    memcmp(entry->dst_addr, dst, ETH_ALEN) == 0)
                        return entry;
        }

        return NULL;
}

/* Called only as a tasklet (software IRQ) */
static struct sk_buff *
ieee80211_frag_cache_get(struct ieee80211_device *ieee,
                         struct ieee80211_hdr_4addr *hdr)
{
        struct sk_buff *skb = NULL;
        u16 fc = le16_to_cpu(hdr->frame_ctl);
        u16 sc = le16_to_cpu(hdr->seq_ctl);
        unsigned int frag = WLAN_GET_SEQ_FRAG(sc);
        unsigned int seq = WLAN_GET_SEQ_SEQ(sc);
        struct ieee80211_frag_entry *entry;
        struct ieee80211_hdr_3addrqos *hdr_3addrqos;
        struct ieee80211_hdr_4addrqos *hdr_4addrqos;
        u8 tid;

        if (((fc & IEEE80211_FCTL_DSTODS) == IEEE80211_FCTL_DSTODS)&&IEEE80211_QOS_HAS_SEQ(fc)) {
          hdr_4addrqos = (struct ieee80211_hdr_4addrqos *)hdr;
          tid = le16_to_cpu(hdr_4addrqos->qos_ctl) & IEEE80211_QOS_TID;
          tid = UP2AC(tid);
          tid ++;
        } else if (IEEE80211_QOS_HAS_SEQ(fc)) {
          hdr_3addrqos = (struct ieee80211_hdr_3addrqos *)hdr;
          tid = le16_to_cpu(hdr_3addrqos->qos_ctl) & IEEE80211_QOS_TID;
          tid = UP2AC(tid);
          tid ++;
        } else {
          tid = 0;
        }

        if (frag == 0) {
                /* Reserve enough space to fit maximum frame length */
                skb = dev_alloc_skb(ieee->dev->mtu +
                                    sizeof(struct ieee80211_hdr_4addr) +
                                    8 /* LLC */ +
                                    2 /* alignment */ +
                                    8 /* WEP */ +
                                    ETH_ALEN /* WDS */ +
                                    (IEEE80211_QOS_HAS_SEQ(fc)?2:0) /* QOS Control */);
                if (skb == NULL)
                        return NULL;

                entry = &ieee->frag_cache[tid][ieee->frag_next_idx[tid]];
                ieee->frag_next_idx[tid]++;
                if (ieee->frag_next_idx[tid] >= IEEE80211_FRAG_CACHE_LEN)
                        ieee->frag_next_idx[tid] = 0;

                if (entry->skb != NULL)
                        dev_kfree_skb_any(entry->skb);

                entry->first_frag_time = jiffies;
                entry->seq = seq;
                entry->last_frag = frag;
                entry->skb = skb;
                memcpy(entry->src_addr, hdr->addr2, ETH_ALEN);
                memcpy(entry->dst_addr, hdr->addr1, ETH_ALEN);
        } else {
                /* received a fragment of a frame for which the head fragment
                 * should have already been received */
                entry = ieee80211_frag_cache_find(ieee, seq, frag, tid,hdr->addr2,
                                                  hdr->addr1);
                if (entry != NULL) {
                        entry->last_frag = frag;
                        skb = entry->skb;
                }
        }

        return skb;
}


/* Called only as a tasklet (software IRQ) */
static int ieee80211_frag_cache_invalidate(struct ieee80211_device *ieee,
                                           struct ieee80211_hdr_4addr *hdr)
{
        u16 fc = le16_to_cpu(hdr->frame_ctl);
        u16 sc = le16_to_cpu(hdr->seq_ctl);
        unsigned int seq = WLAN_GET_SEQ_SEQ(sc);
        struct ieee80211_frag_entry *entry;
        struct ieee80211_hdr_3addrqos *hdr_3addrqos;
        struct ieee80211_hdr_4addrqos *hdr_4addrqos;
        u8 tid;

        if(((fc & IEEE80211_FCTL_DSTODS) == IEEE80211_FCTL_DSTODS)&&IEEE80211_QOS_HAS_SEQ(fc)) {
          hdr_4addrqos = (struct ieee80211_hdr_4addrqos *)hdr;
          tid = le16_to_cpu(hdr_4addrqos->qos_ctl) & IEEE80211_QOS_TID;
          tid = UP2AC(tid);
          tid ++;
        } else if (IEEE80211_QOS_HAS_SEQ(fc)) {
          hdr_3addrqos = (struct ieee80211_hdr_3addrqos *)hdr;
          tid = le16_to_cpu(hdr_3addrqos->qos_ctl) & IEEE80211_QOS_TID;
          tid = UP2AC(tid);
          tid ++;
        } else {
          tid = 0;
        }

        entry = ieee80211_frag_cache_find(ieee, seq, -1, tid,hdr->addr2,
                                          hdr->addr1);

        if (entry == NULL) {
                IEEE80211_DEBUG_FRAG(
                        "could not invalidate fragment cache "
                        "entry (seq=%u)\n", seq);
                return -1;
        }

        entry->skb = NULL;
        return 0;
}



/* ieee80211_rx_frame_mgtmt
 *
 * Responsible for handling management control frames
 *
 * Called by ieee80211_rx */
static inline int
ieee80211_rx_frame_mgmt(struct ieee80211_device *ieee, struct sk_buff *skb,
                        struct ieee80211_rx_stats *rx_stats, u16 type,
                        u16 stype)
{
        struct ieee80211_hdr_4addr *hdr;

        // cheat the the hdr type
        hdr = (struct ieee80211_hdr_4addr *)skb->data;

        /* On the struct stats definition there is written that
         * this is not mandatory.... but seems that the probe
         * response parser uses it
         */
        rx_stats->len = skb->len;
        ieee80211_rx_mgt(ieee, (struct ieee80211_hdr_4addr *)skb->data,
                         rx_stats);

        if((ieee->state == IEEE80211_LINKED)&&(memcmp(hdr->addr3,ieee->current_network.bssid,ETH_ALEN))) {
                dev_kfree_skb_any(skb);
                return 0;
        }

        ieee80211_rx_frame_softmac(ieee, skb, rx_stats, type, stype);

        dev_kfree_skb_any(skb);

        return 0;

}



/* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */
/* Ethernet-II snap header (RFC1042 for most EtherTypes) */
static unsigned char rfc1042_header[] =
{ 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
/* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
static unsigned char bridge_tunnel_header[] =
{ 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
/* No encapsulation header if EtherType < 0x600 (=length) */

/* Called by ieee80211_rx_frame_decrypt */
static int ieee80211_is_eapol_frame(struct ieee80211_device *ieee,
                                    struct sk_buff *skb, size_t hdrlen)
{
        struct net_device *dev = ieee->dev;
        u16 fc, ethertype;
        struct ieee80211_hdr_4addr *hdr;
        u8 *pos;

        if (skb->len < 24)
                return 0;

        hdr = (struct ieee80211_hdr_4addr *)skb->data;
        fc = le16_to_cpu(hdr->frame_ctl);

        /* check that the frame is unicast frame to us */
        if ((fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) ==
            IEEE80211_FCTL_TODS &&
            memcmp(hdr->addr1, dev->dev_addr, ETH_ALEN) == 0 &&
            memcmp(hdr->addr3, dev->dev_addr, ETH_ALEN) == 0) {
                /* ToDS frame with own addr BSSID and DA */
        } else if ((fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) ==
                   IEEE80211_FCTL_FROMDS &&
                   memcmp(hdr->addr1, dev->dev_addr, ETH_ALEN) == 0) {
                /* FromDS frame with own addr as DA */
        } else
                return 0;

        if (skb->len < 24 + 8)
                return 0;

        /* check for port access entity Ethernet type */
//      pos = skb->data + 24;
        pos = skb->data + hdrlen;
        ethertype = (pos[6] << 8) | pos[7];
        if (ethertype == ETH_P_PAE)
                return 1;

        return 0;
}

/* Called only as a tasklet (software IRQ), by ieee80211_rx */
static inline int
ieee80211_rx_frame_decrypt(struct ieee80211_device* ieee, struct sk_buff *skb,
                           struct ieee80211_crypt_data *crypt)
{
        struct ieee80211_hdr_4addr *hdr;
        int res, hdrlen;

        if (crypt == NULL || crypt->ops->decrypt_mpdu == NULL)
                return 0;

        hdr = (struct ieee80211_hdr_4addr *)skb->data;
        hdrlen = ieee80211_get_hdrlen(le16_to_cpu(hdr->frame_ctl));

#ifdef CONFIG_IEEE80211_CRYPT_TKIP
        if (ieee->tkip_countermeasures &&
            strcmp(crypt->ops->name, "TKIP") == 0) {
                if (net_ratelimit()) {
                        printk(KERN_DEBUG "%s: TKIP countermeasures: dropped "
                               "received packet from %pM\n",
                               ieee->dev->name, hdr->addr2);
                }
                return -1;
        }
#endif

        atomic_inc(&crypt->refcnt);
        res = crypt->ops->decrypt_mpdu(skb, hdrlen, crypt->priv);
        atomic_dec(&crypt->refcnt);
        if (res < 0) {
                IEEE80211_DEBUG_DROP(
                        "decryption failed (SA=%pM"
                        ") res=%d\n", hdr->addr2, res);
                if (res == -2)
                        IEEE80211_DEBUG_DROP("Decryption failed ICV "
                                             "mismatch (key %d)\n",
                                             skb->data[hdrlen + 3] >> 6);
                ieee->ieee_stats.rx_discards_undecryptable++;
                return -1;
        }

        return res;
}


/* Called only as a tasklet (software IRQ), by ieee80211_rx */
static inline int
ieee80211_rx_frame_decrypt_msdu(struct ieee80211_device* ieee, struct sk_buff *skb,
                             int keyidx, struct ieee80211_crypt_data *crypt)
{
        struct ieee80211_hdr_4addr *hdr;
        int res, hdrlen;

        if (crypt == NULL || crypt->ops->decrypt_msdu == NULL)
                return 0;

        hdr = (struct ieee80211_hdr_4addr *)skb->data;
        hdrlen = ieee80211_get_hdrlen(le16_to_cpu(hdr->frame_ctl));

        atomic_inc(&crypt->refcnt);
        res = crypt->ops->decrypt_msdu(skb, keyidx, hdrlen, crypt->priv);
        atomic_dec(&crypt->refcnt);
        if (res < 0) {
                printk(KERN_DEBUG "%s: MSDU decryption/MIC verification failed"
                       " (SA=%pM keyidx=%d)\n",
                       ieee->dev->name, hdr->addr2, keyidx);
                return -1;
        }

        return 0;
}


/* this function is stolen from ipw2200 driver*/
#define IEEE_PACKET_RETRY_TIME (5*HZ)
static int is_duplicate_packet(struct ieee80211_device *ieee,
                                      struct ieee80211_hdr_4addr *header)
{
        u16 fc = le16_to_cpu(header->frame_ctl);
        u16 sc = le16_to_cpu(header->seq_ctl);
        u16 seq = WLAN_GET_SEQ_SEQ(sc);
        u16 frag = WLAN_GET_SEQ_FRAG(sc);
        u16 *last_seq, *last_frag;
        unsigned long *last_time;
        struct ieee80211_hdr_3addrqos *hdr_3addrqos;
        struct ieee80211_hdr_4addrqos *hdr_4addrqos;
        u8 tid;

        //TO2DS and QoS
        if(((fc & IEEE80211_FCTL_DSTODS) == IEEE80211_FCTL_DSTODS)&&IEEE80211_QOS_HAS_SEQ(fc)) {
          hdr_4addrqos = (struct ieee80211_hdr_4addrqos *)header;
          tid = le16_to_cpu(hdr_4addrqos->qos_ctl) & IEEE80211_QOS_TID;
          tid = UP2AC(tid);
          tid ++;
        } else if(IEEE80211_QOS_HAS_SEQ(fc)) { //QoS
          hdr_3addrqos = (struct ieee80211_hdr_3addrqos *)header;
          tid = le16_to_cpu(hdr_3addrqos->qos_ctl) & IEEE80211_QOS_TID;
          tid = UP2AC(tid);
          tid ++;
        } else { // no QoS
          tid = 0;
        }
        switch (ieee->iw_mode) {
        case IW_MODE_ADHOC:
        {
                struct list_head *p;
                struct ieee_ibss_seq *entry = NULL;
                u8 *mac = header->addr2;
                int index = mac[5] % IEEE_IBSS_MAC_HASH_SIZE;
                //for (pos = (head)->next; pos != (head); pos = pos->next)
                __list_for_each(p, &ieee->ibss_mac_hash[index]) {
                        entry = list_entry(p, struct ieee_ibss_seq, list);
                        if (!memcmp(entry->mac, mac, ETH_ALEN))
                                break;
                }
        //      if (memcmp(entry->mac, mac, ETH_ALEN)){
                if (p == &ieee->ibss_mac_hash[index]) {
                        entry = kmalloc(sizeof(struct ieee_ibss_seq), GFP_ATOMIC);
                        if (!entry) {
                                printk(KERN_WARNING "Cannot malloc new mac entry\n");
                                return 0;
                        }
                        memcpy(entry->mac, mac, ETH_ALEN);
                        entry->seq_num[tid] = seq;
                        entry->frag_num[tid] = frag;
                        entry->packet_time[tid] = jiffies;
                        list_add(&entry->list, &ieee->ibss_mac_hash[index]);
                        return 0;
                }
                last_seq = &entry->seq_num[tid];
                last_frag = &entry->frag_num[tid];
                last_time = &entry->packet_time[tid];
                break;
        }

        case IW_MODE_INFRA:
                last_seq = &ieee->last_rxseq_num[tid];
                last_frag = &ieee->last_rxfrag_num[tid];
                last_time = &ieee->last_packet_time[tid];

                break;
        default:
                return 0;
        }

//      if(tid != 0) {
//              printk(KERN_WARNING ":)))))))))))%x %x %x, fc(%x)\n", tid, *last_seq, seq, header->frame_ctl);
//      }
        if ((*last_seq == seq) &&
            time_after(*last_time + IEEE_PACKET_RETRY_TIME, jiffies)) {
                if (*last_frag == frag){
                        //printk(KERN_WARNING "[1] go drop!\n");
                        goto drop;

                }
                if (*last_frag + 1 != frag)
                        /* out-of-order fragment */
                        //printk(KERN_WARNING "[2] go drop!\n");
                        goto drop;
        } else
                *last_seq = seq;

        *last_frag = frag;
        *last_time = jiffies;
        return 0;

drop:
//      BUG_ON(!(fc & IEEE80211_FCTL_RETRY));
//      printk("DUP\n");

        return 1;
}


/* All received frames are sent to this function. @skb contains the frame in
 * IEEE 802.11 format, i.e., in the format it was sent over air.
 * This function is called only as a tasklet (software IRQ). */
int ieee80211_rtl_rx(struct ieee80211_device *ieee, struct sk_buff *skb,
                 struct ieee80211_rx_stats *rx_stats)
{
        struct net_device *dev = ieee->dev;
        //struct r8180_priv *priv = (struct r8180_priv *)ieee80211_priv(dev);
        struct ieee80211_hdr_4addr *hdr;

        size_t hdrlen;
        u16 fc, type, stype, sc;
        struct net_device_stats *stats;
        unsigned int frag;
        u8 *payload;
        u16 ethertype;
        u8 dst[ETH_ALEN];
        u8 src[ETH_ALEN];
        u8 bssid[ETH_ALEN];
        struct ieee80211_crypt_data *crypt = NULL;
        int keyidx = 0;

        // cheat the the hdr type
        hdr = (struct ieee80211_hdr_4addr *)skb->data;
        stats = &ieee->stats;

        if (skb->len < 10) {
                printk(KERN_INFO "%s: SKB length < 10\n",
                       dev->name);
                goto rx_dropped;
        }

        fc = le16_to_cpu(hdr->frame_ctl);
        type = WLAN_FC_GET_TYPE(fc);
        stype = WLAN_FC_GET_STYPE(fc);
        sc = le16_to_cpu(hdr->seq_ctl);

        frag = WLAN_GET_SEQ_FRAG(sc);

//YJ,add,080828,for keep alive
        if((fc & IEEE80211_FCTL_TODS) != IEEE80211_FCTL_TODS)
        {
                if(!memcmp(hdr->addr1,dev->dev_addr, ETH_ALEN))
                {
                        ieee->NumRxUnicast++;
                }
        }
        else
        {
                if(!memcmp(hdr->addr3, dev->dev_addr, ETH_ALEN))
                {
                        ieee->NumRxUnicast++;
                }
        }
//YJ,add,080828,for keep alive,end

        hdrlen = ieee80211_get_hdrlen(fc);


        if (ieee->iw_mode == IW_MODE_MONITOR) {
                ieee80211_monitor_rx(ieee, skb, rx_stats);
                stats->rx_packets++;
                stats->rx_bytes += skb->len;
                return 1;
        }

        if (ieee->host_decrypt) {
                int idx = 0;
                if (skb->len >= hdrlen + 3)
                        idx = skb->data[hdrlen + 3] >> 6;
                crypt = ieee->crypt[idx];

                /* allow NULL decrypt to indicate an station specific override
                 * for default encryption */
                if (crypt && (crypt->ops == NULL ||
                              crypt->ops->decrypt_mpdu == NULL))
                        crypt = NULL;

                if (!crypt && (fc & IEEE80211_FCTL_WEP)) {
                        /* This seems to be triggered by some (multicast?)
                         * frames from other than current BSS, so just drop the
                         * frames silently instead of filling system log with
                         * these reports. */
                        IEEE80211_DEBUG_DROP("Decryption failed (not set)"
                                             " (SA=%pM)\n",
                                             hdr->addr2);
                        ieee->ieee_stats.rx_discards_undecryptable++;
                        goto rx_dropped;
                }
        }

        if (skb->len < IEEE80211_DATA_HDR3_LEN)
                goto rx_dropped;

        // if QoS enabled, should check the sequence for each of the AC
        if (is_duplicate_packet(ieee, hdr))
                goto rx_dropped;


        if (type == IEEE80211_FTYPE_MGMT) {
                if (ieee80211_rx_frame_mgmt(ieee, skb, rx_stats, type, stype))
                        goto rx_dropped;
                else
                        goto rx_exit;
        }

        /* Data frame - extract src/dst addresses */
        switch (fc & (IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS)) {
        case IEEE80211_FCTL_FROMDS:
                memcpy(dst, hdr->addr1, ETH_ALEN);
                memcpy(src, hdr->addr3, ETH_ALEN);
                memcpy(bssid,hdr->addr2,ETH_ALEN);
                break;
        case IEEE80211_FCTL_TODS:
                memcpy(dst, hdr->addr3, ETH_ALEN);
                memcpy(src, hdr->addr2, ETH_ALEN);
                memcpy(bssid,hdr->addr1,ETH_ALEN);
                break;
        case IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS:
                if (skb->len < IEEE80211_DATA_HDR4_LEN)
                        goto rx_dropped;
                memcpy(dst, hdr->addr3, ETH_ALEN);
                memcpy(src, hdr->addr4, ETH_ALEN);
                memcpy(bssid, ieee->current_network.bssid, ETH_ALEN);
                break;
        case 0:
                memcpy(dst, hdr->addr1, ETH_ALEN);
                memcpy(src, hdr->addr2, ETH_ALEN);
                memcpy(bssid,hdr->addr3,ETH_ALEN);
                break;
        }


        dev->last_rx = jiffies;


        /* Nullfunc frames may have PS-bit set, so they must be passed to
         * hostap_handle_sta_rx() before being dropped here. */
        if (stype != IEEE80211_STYPE_DATA &&
            stype != IEEE80211_STYPE_DATA_CFACK &&
            stype != IEEE80211_STYPE_DATA_CFPOLL &&
            stype != IEEE80211_STYPE_DATA_CFACKPOLL&&
            stype != IEEE80211_STYPE_QOS_DATA//add by David,2006.8.4
            ) {
                if (stype != IEEE80211_STYPE_NULLFUNC)
                        IEEE80211_DEBUG_DROP(
                                "RX: dropped data frame "
                                "with no data (type=0x%02x, "
                                "subtype=0x%02x, len=%d)\n",
                                type, stype, skb->len);
                goto rx_dropped;
        }
        if(memcmp(bssid,ieee->current_network.bssid,ETH_ALEN)) {
                goto rx_dropped;
        }

        ieee->NumRxDataInPeriod++;
        ieee->NumRxOkTotal++;
        /* skb: hdr + (possibly fragmented, possibly encrypted) payload */

        if (ieee->host_decrypt && (fc & IEEE80211_FCTL_WEP) &&
            (keyidx = ieee80211_rx_frame_decrypt(ieee, skb, crypt)) < 0)
                goto rx_dropped;

        hdr = (struct ieee80211_hdr_4addr *)skb->data;

        /* skb: hdr + (possibly fragmented) plaintext payload */
        // PR: FIXME: hostap has additional conditions in the "if" below:
        // ieee->host_decrypt && (fc & IEEE80211_FCTL_WEP) &&
        if ((frag != 0 || (fc & IEEE80211_FCTL_MOREFRAGS))) {
                int flen;
                struct sk_buff *frag_skb = ieee80211_frag_cache_get(ieee, hdr);
                IEEE80211_DEBUG_FRAG("Rx Fragment received (%u)\n", frag);

                if (!frag_skb) {
                        IEEE80211_DEBUG(IEEE80211_DL_RX | IEEE80211_DL_FRAG,
                                        "Rx cannot get skb from fragment "
                                        "cache (morefrag=%d seq=%u frag=%u)\n",
                                        (fc & IEEE80211_FCTL_MOREFRAGS) != 0,
                                        WLAN_GET_SEQ_SEQ(sc), frag);
                        goto rx_dropped;
                }
                flen = skb->len;
                if (frag != 0)
                        flen -= hdrlen;

                if (frag_skb->tail + flen > frag_skb->end) {
                        printk(KERN_WARNING "%s: host decrypted and "
                               "reassembled frame did not fit skb\n",
                               dev->name);
                        ieee80211_frag_cache_invalidate(ieee, hdr);
                        goto rx_dropped;
                }

                if (frag == 0) {
                        /* copy first fragment (including full headers) into
                         * beginning of the fragment cache skb */
                        memcpy(skb_put(frag_skb, flen), skb->data, flen);
                } else {
                        /* append frame payload to the end of the fragment
                         * cache skb */
                        memcpy(skb_put(frag_skb, flen), skb->data + hdrlen,
                               flen);
                }
                dev_kfree_skb_any(skb);
                skb = NULL;

                if (fc & IEEE80211_FCTL_MOREFRAGS) {
                        /* more fragments expected - leave the skb in fragment
                         * cache for now; it will be delivered to upper layers
                         * after all fragments have been received */
                        goto rx_exit;
                }

                /* this was the last fragment and the frame will be
                 * delivered, so remove skb from fragment cache */
                skb = frag_skb;
                hdr = (struct ieee80211_hdr_4addr *)skb->data;
                ieee80211_frag_cache_invalidate(ieee, hdr);
        }

        /* skb: hdr + (possible reassembled) full MSDU payload; possibly still
         * encrypted/authenticated */
        if (ieee->host_decrypt && (fc & IEEE80211_FCTL_WEP) &&
            ieee80211_rx_frame_decrypt_msdu(ieee, skb, keyidx, crypt))
                goto rx_dropped;

        hdr = (struct ieee80211_hdr_4addr *)skb->data;
        if (crypt && !(fc & IEEE80211_FCTL_WEP) && !ieee->open_wep) {
                if (/*ieee->ieee802_1x &&*/
                    ieee80211_is_eapol_frame(ieee, skb, hdrlen)) {

#ifdef CONFIG_IEEE80211_DEBUG
                        /* pass unencrypted EAPOL frames even if encryption is
                         * configured */
                        struct eapol *eap = (struct eapol *)(skb->data +
                                24);
                        IEEE80211_DEBUG_EAP("RX: IEEE 802.1X EAPOL frame: %s\n",
                                                eap_get_type(eap->type));
#endif
                } else {
                        IEEE80211_DEBUG_DROP(
                                "encryption configured, but RX "
                                "frame not encrypted (SA=%pM)\n",
                                hdr->addr2);
                        goto rx_dropped;
                }
        }

#ifdef CONFIG_IEEE80211_DEBUG
        if (crypt && !(fc & IEEE80211_FCTL_WEP) &&
            ieee80211_is_eapol_frame(ieee, skb, hdrlen)) {
                        struct eapol *eap = (struct eapol *)(skb->data +
                                24);
                        IEEE80211_DEBUG_EAP("RX: IEEE 802.1X EAPOL frame: %s\n",
                                                eap_get_type(eap->type));
        }
#endif

        if (crypt && !(fc & IEEE80211_FCTL_WEP) && !ieee->open_wep &&
            !ieee80211_is_eapol_frame(ieee, skb, hdrlen)) {
                IEEE80211_DEBUG_DROP(
                        "dropped unencrypted RX data "
                        "frame from %pM"
                        " (drop_unencrypted=1)\n",
                        hdr->addr2);
                goto rx_dropped;
        }
/*
        if(ieee80211_is_eapol_frame(ieee, skb, hdrlen)) {
                printk(KERN_WARNING "RX: IEEE802.1X EPAOL frame!\n");
        }
*/
        /* skb: hdr + (possible reassembled) full plaintext payload */
        payload = skb->data + hdrlen;
        ethertype = (payload[6] << 8) | payload[7];


        /* convert hdr + possible LLC headers into Ethernet header */
        if (skb->len - hdrlen >= 8 &&
            ((memcmp(payload, rfc1042_header, SNAP_SIZE) == 0 &&
              ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
             memcmp(payload, bridge_tunnel_header, SNAP_SIZE) == 0)) {
                /* remove RFC1042 or Bridge-Tunnel encapsulation and
                 * replace EtherType */
                skb_pull(skb, hdrlen + SNAP_SIZE);
                memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
                memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
        } else {
                u16 len;
                /* Leave Ethernet header part of hdr and full payload */
                skb_pull(skb, hdrlen);
                len = htons(skb->len);
                memcpy(skb_push(skb, 2), &len, 2);
                memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
                memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
        }


        stats->rx_packets++;
        stats->rx_bytes += skb->len;

        if (skb) {
                skb->protocol = eth_type_trans(skb, dev);
                memset(skb->cb, 0, sizeof(skb->cb));
                skb->dev = dev;
                skb->ip_summed = CHECKSUM_NONE; /* 802.11 crc not sufficient */
                ieee->last_rx_ps_time = jiffies;
                netif_rx(skb);
        }

 rx_exit:
        return 1;

 rx_dropped:
        stats->rx_dropped++;

        /* Returning 0 indicates to caller that we have not handled the SKB--
         * so it is still allocated and can be used again by underlying
         * hardware as a DMA target */
        return 0;
}

#define MGMT_FRAME_FIXED_PART_LENGTH            0x24

static inline int ieee80211_is_ofdm_rate(u8 rate)
{
        switch (rate & ~IEEE80211_BASIC_RATE_MASK) {
        case IEEE80211_OFDM_RATE_6MB:
        case IEEE80211_OFDM_RATE_9MB:
        case IEEE80211_OFDM_RATE_12MB:
        case IEEE80211_OFDM_RATE_18MB:
        case IEEE80211_OFDM_RATE_24MB:
        case IEEE80211_OFDM_RATE_36MB:
        case IEEE80211_OFDM_RATE_48MB:
        case IEEE80211_OFDM_RATE_54MB:
                return 1;
        }
        return 0;
}

static inline int ieee80211_SignalStrengthTranslate(
        int  CurrSS
        )
{
        int RetSS;

        // Step 1. Scale mapping.
        if(CurrSS >= 71 && CurrSS <= 100)
        {
                RetSS = 90 + ((CurrSS - 70) / 3);
        }
        else if(CurrSS >= 41 && CurrSS <= 70)
        {
                RetSS = 78 + ((CurrSS - 40) / 3);
        }
        else if(CurrSS >= 31 && CurrSS <= 40)
        {
                RetSS = 66 + (CurrSS - 30);
        }
        else if(CurrSS >= 21 && CurrSS <= 30)
        {
                RetSS = 54 + (CurrSS - 20);
        }
        else if(CurrSS >= 5 && CurrSS <= 20)
        {
                RetSS = 42 + (((CurrSS - 5) * 2) / 3);
        }
        else if(CurrSS == 4)
        {
                RetSS = 36;
        }
        else if(CurrSS == 3)
        {
                RetSS = 27;
        }
        else if(CurrSS == 2)
        {
                RetSS = 18;
        }
        else if(CurrSS == 1)
        {
                RetSS = 9;
        }
        else
        {
                RetSS = CurrSS;
        }
        //RT_TRACE(COMP_DBG, DBG_LOUD, ("##### After Mapping:  LastSS: %d, CurrSS: %d, RetSS: %d\n", LastSS, CurrSS, RetSS));

        // Step 2. Smoothing.

        //RT_TRACE(COMP_DBG, DBG_LOUD, ("$$$$$ After Smoothing:  LastSS: %d, CurrSS: %d, RetSS: %d\n", LastSS, CurrSS, RetSS));

        return RetSS;
}

static inline void ieee80211_extract_country_ie(
        struct ieee80211_device *ieee,
        struct ieee80211_info_element *info_element,
        struct ieee80211_network *network,
        u8 * addr2
)
{
        if(IS_DOT11D_ENABLE(ieee))
        {
                if(info_element->len!= 0)
                {
                        memcpy(network->CountryIeBuf, info_element->data, info_element->len);
                        network->CountryIeLen = info_element->len;

                        if(!IS_COUNTRY_IE_VALID(ieee))
                        {
                                Dot11d_UpdateCountryIe(ieee, addr2, info_element->len, info_element->data);
                        }
                }

                //
                // 070305, rcnjko: I update country IE watch dog here because
                // some AP (e.g. Cisco 1242) don't include country IE in their
                // probe response frame.
                //
                if(IS_EQUAL_CIE_SRC(ieee, addr2) )
                {
                        UPDATE_CIE_WATCHDOG(ieee);
                }
        }

}

int
ieee80211_TranslateToDbm(
        unsigned char SignalStrengthIndex       // 0-100 index.
        )
{
        unsigned char SignalPower; // in dBm.

        // Translate to dBm (x=0.5y-95).
        SignalPower = (int)SignalStrengthIndex * 7 / 10;
        SignalPower -= 95;

        return SignalPower;
}
inline int ieee80211_network_init(
        struct ieee80211_device *ieee,
        struct ieee80211_probe_response *beacon,
        struct ieee80211_network *network,
        struct ieee80211_rx_stats *stats)
{
#ifdef CONFIG_IEEE80211_DEBUG
        char rates_str[64];
        char *p;
#endif
        struct ieee80211_info_element *info_element;
        u16 left;
        u8 i;
        short offset;
        u8 curRate = 0,hOpRate = 0,curRate_ex = 0;

        /* Pull out fixed field data */
        memcpy(network->bssid, beacon->header.addr3, ETH_ALEN);
        network->capability = beacon->capability;
        network->last_scanned = jiffies;
        network->time_stamp[0] = beacon->time_stamp[0];
        network->time_stamp[1] = beacon->time_stamp[1];
        network->beacon_interval = beacon->beacon_interval;
        /* Where to pull this? beacon->listen_interval;*/
        network->listen_interval = 0x0A;
        network->rates_len = network->rates_ex_len = 0;
        network->last_associate = 0;
        network->ssid_len = 0;
        network->flags = 0;
        network->atim_window = 0;
        network->QoS_Enable = 0;
//by amy 080312
        network->HighestOperaRate = 0;
//by amy 080312
        network->Turbo_Enable = 0;
        network->CountryIeLen = 0;
        memset(network->CountryIeBuf, 0, MAX_IE_LEN);

        if (stats->freq == IEEE80211_52GHZ_BAND) {
                /* for A band (No DS info) */
                network->channel = stats->received_channel;
        } else
                network->flags |= NETWORK_HAS_CCK;

        network->wpa_ie_len = 0;
        network->rsn_ie_len = 0;

        info_element = &beacon->info_element;
        left = stats->len - ((void *)info_element - (void *)beacon);
        while (left >= sizeof(struct ieee80211_info_element_hdr)) {
                if (sizeof(struct ieee80211_info_element_hdr) + info_element->len > left) {
                        IEEE80211_DEBUG_SCAN("SCAN: parse failed: info_element->len + 2 > left : info_element->len+2=%d left=%d.\n",
                                             info_element->len + sizeof(struct ieee80211_info_element),
                                             left);
                        return 1;
                }

                switch (info_element->id) {
                case MFIE_TYPE_SSID:
                        if (ieee80211_is_empty_essid(info_element->data,
                                                     info_element->len)) {
                                network->flags |= NETWORK_EMPTY_ESSID;
                                break;
                        }

                        network->ssid_len = min(info_element->len,
                                                (u8)IW_ESSID_MAX_SIZE);
                        memcpy(network->ssid, info_element->data, network->ssid_len);
                        if (network->ssid_len < IW_ESSID_MAX_SIZE)
                                memset(network->ssid + network->ssid_len, 0,
                                       IW_ESSID_MAX_SIZE - network->ssid_len);

                        IEEE80211_DEBUG_SCAN("MFIE_TYPE_SSID: '%s' len=%d.\n",
                                             network->ssid, network->ssid_len);
                        break;

                case MFIE_TYPE_RATES:
#ifdef CONFIG_IEEE80211_DEBUG
                        p = rates_str;
#endif
                        network->rates_len = min(info_element->len, MAX_RATES_LENGTH);
                        for (i = 0; i < network->rates_len; i++) {
                                network->rates[i] = info_element->data[i];
                                curRate = network->rates[i] & 0x7f;
                                if( hOpRate < curRate )
                                        hOpRate = curRate;
#ifdef CONFIG_IEEE80211_DEBUG
                                p += snprintf(p, sizeof(rates_str) - (p - rates_str), "%02X ", network->rates[i]);
#endif

                                if (ieee80211_is_ofdm_rate(info_element->data[i])) {
                                        network->flags |= NETWORK_HAS_OFDM;
                                        if (info_element->data[i] &
                                            IEEE80211_BASIC_RATE_MASK)
                                                network->flags &=
                                                        ~NETWORK_HAS_CCK;
                                }
                        }

                        IEEE80211_DEBUG_SCAN("MFIE_TYPE_RATES: '%s' (%d)\n",
                                             rates_str, network->rates_len);
                        break;

                case MFIE_TYPE_RATES_EX:
#ifdef CONFIG_IEEE80211_DEBUG
                        p = rates_str;
#endif
                        network->rates_ex_len = min(info_element->len, MAX_RATES_EX_LENGTH);
                        for (i = 0; i < network->rates_ex_len; i++) {
                                network->rates_ex[i] = info_element->data[i];
                                curRate_ex = network->rates_ex[i] & 0x7f;
                                if( hOpRate < curRate_ex )
                                        hOpRate = curRate_ex;
#ifdef CONFIG_IEEE80211_DEBUG
                                p += snprintf(p, sizeof(rates_str) - (p - rates_str), "%02X ", network->rates[i]);
#endif
                                if (ieee80211_is_ofdm_rate(info_element->data[i])) {
                                        network->flags |= NETWORK_HAS_OFDM;
                                        if (info_element->data[i] &
                                            IEEE80211_BASIC_RATE_MASK)
                                                network->flags &=
                                                        ~NETWORK_HAS_CCK;
                                }
                        }

                        IEEE80211_DEBUG_SCAN("MFIE_TYPE_RATES_EX: '%s' (%d)\n",
                                             rates_str, network->rates_ex_len);
                        break;

                case MFIE_TYPE_DS_SET:
                        IEEE80211_DEBUG_SCAN("MFIE_TYPE_DS_SET: %d\n",
                                             info_element->data[0]);
                        if (stats->freq == IEEE80211_24GHZ_BAND)
                                network->channel = info_element->data[0];
                        break;

                case MFIE_TYPE_FH_SET:
                        IEEE80211_DEBUG_SCAN("MFIE_TYPE_FH_SET: ignored\n");
                        break;

                case MFIE_TYPE_CF_SET:
                        IEEE80211_DEBUG_SCAN("MFIE_TYPE_CF_SET: ignored\n");
                        break;

                case MFIE_TYPE_TIM:

                        if(info_element->len < 4)
                                break;

                        network->dtim_period = info_element->data[1];

                        if(ieee->state != IEEE80211_LINKED)
                                break;

                        network->last_dtim_sta_time[0] = jiffies;
                        network->last_dtim_sta_time[1] = stats->mac_time[1];

                        network->dtim_data = IEEE80211_DTIM_VALID;

                        if(info_element->data[0] != 0)
                                break;

                        if(info_element->data[2] & 1)
                                network->dtim_data |= IEEE80211_DTIM_MBCAST;

                        offset = (info_element->data[2] >> 1)*2;

                        //printk("offset1:%x aid:%x\n",offset, ieee->assoc_id);

                        /* add and modified for ps 2008.1.22 */
                        if(ieee->assoc_id < 8*offset ||
                                ieee->assoc_id > 8*(offset + info_element->len -3)) {
                                break;
                        }

                        offset = (ieee->assoc_id/8) - offset;// + ((aid % 8)? 0 : 1) ;

                //      printk("offset:%x data:%x, ucast:%d\n", offset,
                        //      info_element->data[3+offset] ,
                        //      info_element->data[3+offset] & (1<<(ieee->assoc_id%8)));

                        if(info_element->data[3+offset] & (1<<(ieee->assoc_id%8))) {
                                network->dtim_data |= IEEE80211_DTIM_UCAST;
                        }
                        break;

                case MFIE_TYPE_IBSS_SET:
                        IEEE80211_DEBUG_SCAN("MFIE_TYPE_IBSS_SET: ignored\n");
                        break;

                case MFIE_TYPE_CHALLENGE:
                        IEEE80211_DEBUG_SCAN("MFIE_TYPE_CHALLENGE: ignored\n");
                        break;

                case MFIE_TYPE_GENERIC:
                        //nic is 87B
                        IEEE80211_DEBUG_SCAN("MFIE_TYPE_GENERIC: %d bytes\n",
                                             info_element->len);
                        if (info_element->len >= 4  &&
                            info_element->data[0] == 0x00 &&
                            info_element->data[1] == 0x50 &&
                            info_element->data[2] == 0xf2 &&
                            info_element->data[3] == 0x01) {
                                network->wpa_ie_len = min(info_element->len + 2,
                                                         MAX_WPA_IE_LEN);
                                memcpy(network->wpa_ie, info_element,
                                       network->wpa_ie_len);
                        }

                        if (info_element->len == 7 &&
                            info_element->data[0] == 0x00 &&
                            info_element->data[1] == 0xe0 &&
                            info_element->data[2] == 0x4c &&
                            info_element->data[3] == 0x01 &&
                            info_element->data[4] == 0x02) {
                                network->Turbo_Enable = 1;
                        }
                        if (1 == stats->nic_type) {//nic 87
                                break;
                        }

                        if (info_element->len >= 5  &&
                            info_element->data[0] == 0x00 &&
                            info_element->data[1] == 0x50 &&
                            info_element->data[2] == 0xf2 &&
                            info_element->data[3] == 0x02 &&
                            info_element->data[4] == 0x00) {
                                //printk(KERN_WARNING "wmm info updated: %x\n", info_element->data[6]);
                                //WMM Information Element
                                network->wmm_info = info_element->data[6];
                                network->QoS_Enable = 1;
                        }

                        if (info_element->len >= 8  &&
                            info_element->data[0] == 0x00 &&
                            info_element->data[1] == 0x50 &&
                            info_element->data[2] == 0xf2 &&
                            info_element->data[3] == 0x02 &&
                            info_element->data[4] == 0x01) {
                                // Not care about version at present.
                                //WMM Information Element
                                //printk(KERN_WARNING "wmm info&param updated: %x\n", info_element->data[6]);
                                network->wmm_info = info_element->data[6];
                                //WMM Parameter Element
                                memcpy(network->wmm_param, (u8 *)(info_element->data + 8),(info_element->len - 8));
                                network->QoS_Enable = 1;
                        }
                        break;

                case MFIE_TYPE_RSN:
                        IEEE80211_DEBUG_SCAN("MFIE_TYPE_RSN: %d bytes\n",
                                             info_element->len);
                        network->rsn_ie_len = min(info_element->len + 2,
                                                 MAX_WPA_IE_LEN);
                        memcpy(network->rsn_ie, info_element,
                               network->rsn_ie_len);
                        break;
                case MFIE_TYPE_COUNTRY:
                        IEEE80211_DEBUG_SCAN("MFIE_TYPE_COUNTRY: %d bytes\n",
                                             info_element->len);
//                      printk("=====>Receive <%s> Country IE\n",network->ssid);
                        ieee80211_extract_country_ie(ieee, info_element, network, beacon->header.addr2);
                        break;
                default:
                        IEEE80211_DEBUG_SCAN("unsupported IE %d\n",
                                             info_element->id);
                        break;
                }

                left -= sizeof(struct ieee80211_info_element_hdr) +
                        info_element->len;
                info_element = (struct ieee80211_info_element *)
                        &info_element->data[info_element->len];
        }
//by amy 080312
        network->HighestOperaRate = hOpRate;
//by amy 080312
        network->mode = 0;
        if (stats->freq == IEEE80211_52GHZ_BAND)
                network->mode = IEEE_A;
        else {
                if (network->flags & NETWORK_HAS_OFDM)
                        network->mode |= IEEE_G;
                if (network->flags & NETWORK_HAS_CCK)
                        network->mode |= IEEE_B;
        }

        if (network->mode == 0) {
                IEEE80211_DEBUG_SCAN("Filtered out '%s (%pM)' "
                                     "network.\n",
                                     escape_essid(network->ssid,
                                                  network->ssid_len),
                                     network->bssid);
                return 1;
        }

        if (ieee80211_is_empty_essid(network->ssid, network->ssid_len))
                network->flags |= NETWORK_EMPTY_ESSID;

        stats->signal = ieee80211_TranslateToDbm(stats->signalstrength);
        //stats->noise = stats->signal - stats->noise;
        stats->noise = ieee80211_TranslateToDbm(100 - stats->signalstrength) - 25;
        memcpy(&network->stats, stats, sizeof(network->stats));

        return 0;
}

static inline int is_same_network(struct ieee80211_network *src,
                                  struct ieee80211_network *dst,
                                  struct ieee80211_device * ieee)
{
        /* A network is only a duplicate if the channel, BSSID, ESSID
         * and the capability field (in particular IBSS and BSS) all match.
         * We treat all <hidden> with the same BSSID and channel
         * as one network */
        return (((src->ssid_len == dst->ssid_len) || (ieee->iw_mode == IW_MODE_INFRA)) &&  //YJ,mod,080819,for hidden ap
                //((src->ssid_len == dst->ssid_len) &&
                (src->channel == dst->channel) &&
                !memcmp(src->bssid, dst->bssid, ETH_ALEN) &&
                (!memcmp(src->ssid, dst->ssid, src->ssid_len) || (ieee->iw_mode == IW_MODE_INFRA)) && //YJ,mod,080819,for hidden ap
                //!memcmp(src->ssid, dst->ssid, src->ssid_len) &&
                ((src->capability & WLAN_CAPABILITY_IBSS) ==
                (dst->capability & WLAN_CAPABILITY_IBSS)) &&
                ((src->capability & WLAN_CAPABILITY_BSS) ==
                (dst->capability & WLAN_CAPABILITY_BSS)));
}

inline void update_network(struct ieee80211_network *dst,
                                  struct ieee80211_network *src)
{
        unsigned char quality = src->stats.signalstrength;
        unsigned char signal = 0;
        unsigned char noise = 0;
        if(dst->stats.signalstrength > 0) {
                quality = (dst->stats.signalstrength * 5 + src->stats.signalstrength + 5)/6;
        }
        signal = ieee80211_TranslateToDbm(quality);
        //noise = signal - src->stats.noise;
        if(dst->stats.noise > 0)
                noise = (dst->stats.noise * 5 + src->stats.noise)/6;
        //if(strcmp(dst->ssid, "linksys_lzm000") == 0)
//      printk("ssid:%s, quality:%d, signal:%d\n", dst->ssid, quality, signal);
        memcpy(&dst->stats, &src->stats, sizeof(struct ieee80211_rx_stats));
        dst->stats.signalstrength = quality;
        dst->stats.signal = signal;
//      printk("==================>stats.signal is %d\n",dst->stats.signal);
        dst->stats.noise = noise;


        dst->capability = src->capability;
        memcpy(dst->rates, src->rates, src->rates_len);
        dst->rates_len = src->rates_len;
        memcpy(dst->rates_ex, src->rates_ex, src->rates_ex_len);
        dst->rates_ex_len = src->rates_ex_len;
        dst->HighestOperaRate= src->HighestOperaRate;
        //printk("==========>in %s: src->ssid is %s,chan is %d\n",__func__,src->ssid,src->channel);

        //YJ,add,080819,for hidden ap
        if(src->ssid_len > 0)
        {
                //if(src->ssid_len == 13)
                //      printk("=====================>>>>>>>> Dst ssid: %s Src ssid: %s\n", dst->ssid, src->ssid);
                memset(dst->ssid, 0, dst->ssid_len);
                dst->ssid_len = src->ssid_len;
                memcpy(dst->ssid, src->ssid, src->ssid_len);
        }
        //YJ,add,080819,for hidden ap,end

        dst->channel = src->channel;
        dst->mode = src->mode;
        dst->flags = src->flags;
        dst->time_stamp[0] = src->time_stamp[0];
        dst->time_stamp[1] = src->time_stamp[1];

        dst->beacon_interval = src->beacon_interval;
        dst->listen_interval = src->listen_interval;
        dst->atim_window = src->atim_window;
        dst->dtim_period = src->dtim_period;
        dst->dtim_data = src->dtim_data;
        dst->last_dtim_sta_time[0] = src->last_dtim_sta_time[0];
        dst->last_dtim_sta_time[1] = src->last_dtim_sta_time[1];
//      printk("update:%s, dtim_period:%x, dtim_data:%x\n", src->ssid, src->dtim_period, src->dtim_data);
        memcpy(dst->wpa_ie, src->wpa_ie, src->wpa_ie_len);
        dst->wpa_ie_len = src->wpa_ie_len;
        memcpy(dst->rsn_ie, src->rsn_ie, src->rsn_ie_len);
        dst->rsn_ie_len = src->rsn_ie_len;

        dst->last_scanned = jiffies;
        /* dst->last_associate is not overwritten */
// disable QoS process now, added by David 2006/7/25
#if 1
        dst->wmm_info = src->wmm_info; //sure to exist in beacon or probe response frame.
/*
        if((dst->wmm_info^src->wmm_info)&0x0f) {//Param Set Count change, update Parameter
          memcpy(dst->wmm_param, src->wmm_param, IEEE80211_AC_PRAM_LEN);
        }
*/
        if(src->wmm_param[0].ac_aci_acm_aifsn|| \
           src->wmm_param[1].ac_aci_acm_aifsn|| \
           src->wmm_param[2].ac_aci_acm_aifsn|| \
           src->wmm_param[3].ac_aci_acm_aifsn) {
          memcpy(dst->wmm_param, src->wmm_param, WME_AC_PRAM_LEN);
        }
        dst->QoS_Enable = src->QoS_Enable;
#else
        dst->QoS_Enable = 1;//for Rtl8187 simulation
#endif
        dst->SignalStrength = src->SignalStrength;
        dst->Turbo_Enable = src->Turbo_Enable;
        dst->CountryIeLen = src->CountryIeLen;
        memcpy(dst->CountryIeBuf, src->CountryIeBuf, src->CountryIeLen);
}


inline void ieee80211_process_probe_response(
        struct ieee80211_device *ieee,
        struct ieee80211_probe_response *beacon,
        struct ieee80211_rx_stats *stats)
{
        struct ieee80211_network network;
        struct ieee80211_network *target;
        struct ieee80211_network *oldest = NULL;
#ifdef CONFIG_IEEE80211_DEBUG
        struct ieee80211_info_element *info_element = &beacon->info_element;
#endif
        unsigned long flags;
        short renew;
        u8 wmm_info;
        u8 is_beacon = (WLAN_FC_GET_STYPE(beacon->header.frame_ctl) == IEEE80211_STYPE_BEACON)? 1:0;  //YJ,add,080819,for hidden ap

        memset(&network, 0, sizeof(struct ieee80211_network));

        IEEE80211_DEBUG_SCAN(
                "'%s' (%pM): %c%c%c%c %c%c%c%c-%c%c%c%c %c%c%c%c\n",
                escape_essid(info_element->data, info_element->len),
                beacon->header.addr3,
                (beacon->capability & (1<<0xf)) ? '1' : '0',
                (beacon->capability & (1<<0xe)) ? '1' : '0',
                (beacon->capability & (1<<0xd)) ? '1' : '0',
                (beacon->capability & (1<<0xc)) ? '1' : '0',
                (beacon->capability & (1<<0xb)) ? '1' : '0',
                (beacon->capability & (1<<0xa)) ? '1' : '0',
                (beacon->capability & (1<<0x9)) ? '1' : '0',
                (beacon->capability & (1<<0x8)) ? '1' : '0',
                (beacon->capability & (1<<0x7)) ? '1' : '0',
                (beacon->capability & (1<<0x6)) ? '1' : '0',
                (beacon->capability & (1<<0x5)) ? '1' : '0',
                (beacon->capability & (1<<0x4)) ? '1' : '0',
                (beacon->capability & (1<<0x3)) ? '1' : '0',
                (beacon->capability & (1<<0x2)) ? '1' : '0',
                (beacon->capability & (1<<0x1)) ? '1' : '0',
                (beacon->capability & (1<<0x0)) ? '1' : '0');

        if (ieee80211_network_init(ieee, beacon, &network, stats)) {
                IEEE80211_DEBUG_SCAN("Dropped '%s' (%pM) via %s.\n",
                                     escape_essid(info_element->data,
                                                  info_element->len),
                                     beacon->header.addr3,
                                     WLAN_FC_GET_STYPE(beacon->header.frame_ctl) ==
                                     IEEE80211_STYPE_PROBE_RESP ?
                                     "PROBE RESPONSE" : "BEACON");
                return;
        }

        // For Asus EeePc request,
        // (1) if wireless adapter receive get any 802.11d country code in AP beacon,
        //         wireless adapter should follow the country code.
        // (2)  If there is no any country code in beacon,
        //       then wireless adapter should do active scan from ch1~11 and
        //       passive scan from ch12~14
        if(ieee->bGlobalDomain)
        {
                if (WLAN_FC_GET_STYPE(beacon->header.frame_ctl) == IEEE80211_STYPE_PROBE_RESP)
                {
                        // Case 1: Country code
                        if(IS_COUNTRY_IE_VALID(ieee) )
                        {
                                if( !IsLegalChannel(ieee, network.channel) )
                                {
                                        printk("GetScanInfo(): For Country code, filter probe response at channel(%d).\n", network.channel);
                                        return;
                                }
                        }
                        // Case 2: No any country code.
                        else
                        {
                                // Filter over channel ch12~14
                                if(network.channel > 11)
                                {
                                        printk("GetScanInfo(): For Global Domain, filter probe response at channel(%d).\n", network.channel);
                                        return;
                                }
                        }
                }
                else
                {
                        // Case 1: Country code
                        if(IS_COUNTRY_IE_VALID(ieee) )
                        {
                                if( !IsLegalChannel(ieee, network.channel) )
                                {
                                        printk("GetScanInfo(): For Country code, filter beacon at channel(%d).\n",network.channel);
                                        return;
                                }
                        }
                        // Case 2: No any country code.
                        else
                        {
                                // Filter over channel ch12~14
                                if(network.channel > 14)
                                {
                                        printk("GetScanInfo(): For Global Domain, filter beacon at channel(%d).\n",network.channel);
                                        return;
                                }
                        }
                }
        }
        /* The network parsed correctly -- so now we scan our known networks
         * to see if we can find it in our list.
         *
         * NOTE:  This search is definitely not optimized.  Once its doing
         *        the "right thing" we'll optimize it for efficiency if
         *        necessary */

        /* Search for this entry in the list and update it if it is
         * already there. */

        spin_lock_irqsave(&ieee->lock, flags);

        if(is_same_network(&ieee->current_network, &network, ieee)) {
                wmm_info = ieee->current_network.wmm_info;
                //YJ,add,080819,for hidden ap
                if(is_beacon == 0)
                        network.flags = (~NETWORK_EMPTY_ESSID & network.flags)|(NETWORK_EMPTY_ESSID & ieee->current_network.flags);
                else if(ieee->state == IEEE80211_LINKED)
                        ieee->NumRxBcnInPeriod++;
                //YJ,add,080819,for hidden ap,end
                //printk("====>network.ssid=%s cur_ssid=%s\n", network.ssid, ieee->current_network.ssid);
                update_network(&ieee->current_network, &network);
        }

        list_for_each_entry(target, &ieee->network_list, list) {
                if (is_same_network(target, &network, ieee))
                        break;
                if ((oldest == NULL) ||
                    (target->last_scanned < oldest->last_scanned))
                        oldest = target;
        }

        /* If we didn't find a match, then get a new network slot to initialize
         * with this beacon's information */
        if (&target->list == &ieee->network_list) {
                if (list_empty(&ieee->network_free_list)) {
                        /* If there are no more slots, expire the oldest */
                        list_del(&oldest->list);
                        target = oldest;
                        IEEE80211_DEBUG_SCAN("Expired '%s' (%pM) from "
                                             "network list.\n",
                                             escape_essid(target->ssid,
                                                          target->ssid_len),
                                             target->bssid);
                } else {
                        /* Otherwise just pull from the free list */
                        target = list_entry(ieee->network_free_list.next,
                                            struct ieee80211_network, list);
                        list_del(ieee->network_free_list.next);
                }


#ifdef CONFIG_IEEE80211_DEBUG
                IEEE80211_DEBUG_SCAN("Adding '%s' (%pM) via %s.\n",
                                     escape_essid(network.ssid,
                                                  network.ssid_len),
                                     network.bssid,
                                     WLAN_FC_GET_STYPE(beacon->header.frame_ctl) ==
                                     IEEE80211_STYPE_PROBE_RESP ?
                                     "PROBE RESPONSE" : "BEACON");
#endif

                memcpy(target, &network, sizeof(*target));
                list_add_tail(&target->list, &ieee->network_list);
        } else {
                IEEE80211_DEBUG_SCAN("Updating '%s' (%pM) via %s.\n",
                                     escape_essid(target->ssid,
                                                  target->ssid_len),
                                     target->bssid,
                                     WLAN_FC_GET_STYPE(beacon->header.frame_ctl) ==
                                     IEEE80211_STYPE_PROBE_RESP ?
                                     "PROBE RESPONSE" : "BEACON");

                /* we have an entry and we are going to update it. But this entry may
                 * be already expired. In this case we do the same as we found a new
                 * net and call the new_net handler
                 */
                renew = !time_after(target->last_scanned + ieee->scan_age, jiffies);
                //YJ,add,080819,for hidden ap
                if(is_beacon == 0)
                        network.flags = (~NETWORK_EMPTY_ESSID & network.flags)|(NETWORK_EMPTY_ESSID & target->flags);
                //if(strncmp(network.ssid, "linksys-c",9) == 0)
                //      printk("====>2 network.ssid=%s FLAG=%d target.ssid=%s FLAG=%d\n", network.ssid, network.flags, target->ssid, target->flags);
                if(((network.flags & NETWORK_EMPTY_ESSID) == NETWORK_EMPTY_ESSID) \
                    && (((network.ssid_len > 0) && (strncmp(target->ssid, network.ssid, network.ssid_len)))\
                    ||((ieee->current_network.ssid_len == network.ssid_len)&&(strncmp(ieee->current_network.ssid, network.ssid, network.ssid_len) == 0)&&(ieee->state == IEEE80211_NOLINK))))
                        renew = 1;
                //YJ,add,080819,for hidden ap,end
                update_network(target, &network);
        }

        spin_unlock_irqrestore(&ieee->lock, flags);
}

void ieee80211_rx_mgt(struct ieee80211_device *ieee,
                      struct ieee80211_hdr_4addr *header,
                      struct ieee80211_rx_stats *stats)
{
        switch (WLAN_FC_GET_STYPE(header->frame_ctl)) {

        case IEEE80211_STYPE_BEACON:
                IEEE80211_DEBUG_MGMT("received BEACON (%d)\n",
                                     WLAN_FC_GET_STYPE(header->frame_ctl));
                IEEE80211_DEBUG_SCAN("Beacon\n");
                ieee80211_process_probe_response(
                        ieee, (struct ieee80211_probe_response *)header, stats);
                break;

        case IEEE80211_STYPE_PROBE_RESP:
                IEEE80211_DEBUG_MGMT("received PROBE RESPONSE (%d)\n",
                                     WLAN_FC_GET_STYPE(header->frame_ctl));
                IEEE80211_DEBUG_SCAN("Probe response\n");
                ieee80211_process_probe_response(
                        ieee, (struct ieee80211_probe_response *)header, stats);
                break;
        }
}