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

  Copyright(c) 2003 - 2004 Intel Corporation. All rights reserved.

  This program is free software; you can redistribute it and/or modify it
  under the terms of version 2 of the GNU General Public License as
  published by the Free Software Foundation.

  This program is distributed in the hope that it will be useful, but WITHOUT
  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  more details.

  You should have received a copy of the GNU General Public License along with
  this program; if not, write to the Free Software Foundation, Inc., 59
  Temple Place - Suite 330, Boston, MA  02111-1307, USA.

  The full GNU General Public License is included in this distribution in the
  file called LICENSE.

  Contact Information:
  James P. Ketrenos <ipw2100-admin@linux.intel.com>
  Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497

******************************************************************************

  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/version.h>
#include <linux/wireless.h>
#include <linux/etherdevice.h>
#include <asm/uaccess.h>
#include <linux/if_vlan.h>

#include "ieee80211.h"


/*


802.11 Data Frame


802.11 frame_contorl for data frames - 2 bytes
     ,-----------------------------------------------------------------------------------------.
bits | 0  |  1  |  2  |  3  |  4  |  5  |  6  |  7  |  8  |  9  |  a  |  b  |  c  |  d  |  e   |
     |----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|------|
val  | 0  |  0  |  0  |  1  |  x  |  0  |  0  |  0  |  1  |  0  |  x  |  x  |  x  |  x  |  x   |
     |----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|------|
desc | ^-ver-^  |  ^type-^  |  ^-----subtype-----^  | to  |from |more |retry| pwr |more |wep   |
     |          |           | x=0 data,x=1 data+ack | DS  | DS  |frag |     | mgm |data |      |
     '-----------------------------------------------------------------------------------------'
		                                    /\
                                                    |
802.11 Data Frame                                   |
           ,--------- 'ctrl' expands to >-----------'
          |
      ,--'---,-------------------------------------------------------------.
Bytes |  2   |  2   |    6    |    6    |    6    |  2   | 0..2312 |   4  |
      |------|------|---------|---------|---------|------|---------|------|
Desc. | ctrl | dura |  DA/RA  |   TA    |    SA   | Sequ |  Frame  |  fcs |
      |      | tion | (BSSID) |         |         | ence |  data   |      |
      `--------------------------------------------------|         |------'
Total: 28 non-data bytes                                 `----.----'
                                                              |
       .- 'Frame data' expands to <---------------------------'
       |
       V
      ,---------------------------------------------------.
Bytes |  1   |  1   |    1    |    3     |  2   |  0-2304 |
      |------|------|---------|----------|------|---------|
Desc. | SNAP | SNAP | Control |Eth Tunnel| Type | IP      |
      | DSAP | SSAP |         |          |      | Packet  |
      | 0xAA | 0xAA |0x03 (UI)|0x00-00-F8|      |         |
      `-----------------------------------------|         |
Total: 8 non-data bytes                         `----.----'
                                                     |
       .- 'IP Packet' expands, if WEP enabled, to <--'
       |
       V
      ,-----------------------.
Bytes |  4  |   0-2296  |  4  |
      |-----|-----------|-----|
Desc. | IV  | Encrypted | ICV |
      |     | IP Packet |     |
      `-----------------------'
Total: 8 non-data bytes


802.3 Ethernet Data Frame

      ,-----------------------------------------.
Bytes |   6   |   6   |  2   |  Variable |   4  |
      |-------|-------|------|-----------|------|
Desc. | Dest. | Source| Type | IP Packet |  fcs |
      |  MAC  |  MAC  |      |           |      |
      `-----------------------------------------'
Total: 18 non-data bytes

In the event that fragmentation is required, the incoming payload is split into
N parts of size ieee->fts.  The first fragment contains the SNAP header and the
remaining packets are just data.

If encryption is enabled, each fragment payload size is reduced by enough space
to add the prefix and postfix (IV and ICV totalling 8 bytes in the case of WEP)
So if you have 1500 bytes of payload with ieee->fts set to 500 without
encryption it will take 3 frames.  With WEP it will take 4 frames as the
payload of each frame is reduced to 492 bytes.

* SKB visualization
*
*  ,- skb->data
* |
* |    ETHERNET HEADER        ,-<-- PAYLOAD
* |                           |     14 bytes from skb->data
* |  2 bytes for Type --> ,T. |     (sizeof ethhdr)
* |                       | | |
* |,-Dest.--. ,--Src.---. | | |
* |  6 bytes| | 6 bytes | | | |
* v         | |         | | | |
* 0         | v       1 | v | v           2
* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
*     ^     | ^         | ^ |
*     |     | |         | | |
*     |     | |         | `T' <---- 2 bytes for Type
*     |     | |         |
*     |     | '---SNAP--' <-------- 6 bytes for SNAP
*     |     |
*     `-IV--' <-------------------- 4 bytes for IV (WEP)
*
*      SNAP HEADER
*
*/

static u8 P802_1H_OUI[P80211_OUI_LEN] = { 0x00, 0x00, 0xf8 };
static u8 RFC1042_OUI[P80211_OUI_LEN] = { 0x00, 0x00, 0x00 };

static inline int ieee80211_put_snap(u8 *data, u16 h_proto)
{
	struct ieee80211_snap_hdr *snap;
	u8 *oui;

	snap = (struct ieee80211_snap_hdr *)data;
	snap->dsap = 0xaa;
	snap->ssap = 0xaa;
	snap->ctrl = 0x03;

	if (h_proto == 0x8137 || h_proto == 0x80f3)
		oui = P802_1H_OUI;
	else
		oui = RFC1042_OUI;
	snap->oui[0] = oui[0];
	snap->oui[1] = oui[1];
	snap->oui[2] = oui[2];

	*(u16 *)(data + SNAP_SIZE) = htons(h_proto);

	return SNAP_SIZE + sizeof(u16);
}

int ieee80211_encrypt_fragment(
	struct ieee80211_device *ieee,
	struct sk_buff *frag,
	int hdr_len)
{
	struct ieee80211_crypt_data* crypt = ieee->crypt[ieee->tx_keyidx];
	int res;

	if (!(crypt && crypt->ops))
	{
		printk("=========>%s(), crypt is null\n", __FUNCTION__);
		return -1;
	}
#ifdef CONFIG_IEEE80211_CRYPT_TKIP
	struct ieee80211_hdr *header;

	if (ieee->tkip_countermeasures &&
	    crypt && crypt->ops && strcmp(crypt->ops->name, "TKIP") == 0) {
		header = (struct ieee80211_hdr *) frag->data;
		if (net_ratelimit()) {
			printk(KERN_DEBUG "%s: TKIP countermeasures: dropped "
			       "TX packet to %pM\n",
			       ieee->dev->name, header->addr1);
		}
		return -1;
	}
#endif
	/* To encrypt, frame format is:
	 * IV (4 bytes), clear payload (including SNAP), ICV (4 bytes) */

	// PR: FIXME: Copied from hostap. Check fragmentation/MSDU/MPDU encryption.
	/* Host-based IEEE 802.11 fragmentation for TX is not yet supported, so
	 * call both MSDU and MPDU encryption functions from here. */
	atomic_inc(&crypt->refcnt);
	res = 0;
	if (crypt->ops->encrypt_msdu)
		res = crypt->ops->encrypt_msdu(frag, hdr_len, crypt->priv);
	if (res == 0 && crypt->ops->encrypt_mpdu)
		res = crypt->ops->encrypt_mpdu(frag, hdr_len, crypt->priv);

	atomic_dec(&crypt->refcnt);
	if (res < 0) {
		printk(KERN_INFO "%s: Encryption failed: len=%d.\n",
		       ieee->dev->name, frag->len);
		ieee->ieee_stats.tx_discards++;
		return -1;
	}

	return 0;
}


void ieee80211_txb_free(struct ieee80211_txb *txb) {
	//int i;
	if (unlikely(!txb))
		return;
#if 0
	for (i = 0; i < txb->nr_frags; i++)
		if (txb->fragments[i])
			dev_kfree_skb_any(txb->fragments[i]);
#endif
	kfree(txb);
}

struct ieee80211_txb *ieee80211_alloc_txb(int nr_frags, int txb_size,
					  int gfp_mask)
{
	struct ieee80211_txb *txb;
	int i;
	txb = kmalloc(
		sizeof(struct ieee80211_txb) + (sizeof(u8*) * nr_frags),
		gfp_mask);
	if (!txb)
		return NULL;

	memset(txb, 0, sizeof(struct ieee80211_txb));
	txb->nr_frags = nr_frags;
	txb->frag_size = txb_size;

	for (i = 0; i < nr_frags; i++) {
		txb->fragments[i] = dev_alloc_skb(txb_size);
		if (unlikely(!txb->fragments[i])) {
			i--;
			break;
		}
		memset(txb->fragments[i]->cb, 0, sizeof(txb->fragments[i]->cb));
	}
	if (unlikely(i != nr_frags)) {
		while (i >= 0)
			dev_kfree_skb_any(txb->fragments[i--]);
		kfree(txb);
		return NULL;
	}
	return txb;
}

// Classify the to-be send data packet
// Need to acquire the sent queue index.
static int
ieee80211_classify(struct sk_buff *skb, struct ieee80211_network *network)
{
	struct ethhdr *eth;
	struct iphdr *ip;
	eth = (struct ethhdr *)skb->data;
	if (eth->h_proto != htons(ETH_P_IP))
		return 0;

//	IEEE80211_DEBUG_DATA(IEEE80211_DL_DATA, skb->data, skb->len);
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,22))
	ip = ip_hdr(skb);
#else
	ip = (struct iphdr*)(skb->data + sizeof(struct ether_header));
#endif
	switch (ip->tos & 0xfc) {
		case 0x20:
			return 2;
		case 0x40:
			return 1;
		case 0x60:
			return 3;
		case 0x80:
			return 4;
		case 0xa0:
			return 5;
		case 0xc0:
			return 6;
		case 0xe0:
			return 7;
		default:
			return 0;
	}
}

#define SN_LESS(a, b)		(((a-b)&0x800)!=0)
void ieee80211_tx_query_agg_cap(struct ieee80211_device* ieee, struct sk_buff* skb, cb_desc* tcb_desc)
{
	PRT_HIGH_THROUGHPUT	pHTInfo = ieee->pHTInfo;
	PTX_TS_RECORD			pTxTs = NULL;
	struct ieee80211_hdr_1addr* hdr = (struct ieee80211_hdr_1addr*)skb->data;

	if (!pHTInfo->bCurrentHTSupport||!pHTInfo->bEnableHT)
		return;
	if (!IsQoSDataFrame(skb->data))
		return;

	if (is_multicast_ether_addr(hdr->addr1) || is_broadcast_ether_addr(hdr->addr1))
		return;
	//check packet and mode later
#ifdef TO_DO_LIST
	if(pTcb->PacketLength >= 4096)
		return;
	// For RTL819X, if pairwisekey = wep/tkip, we don't aggrregation.
	if(!Adapter->HalFunc.GetNmodeSupportBySecCfgHandler(Adapter))
		return;
#endif

        if(tcb_desc->bdhcp)// || ieee->CntAfterLink<2)
        {
                return;
        }


#if 1
	if(!ieee->GetNmodeSupportBySecCfg(ieee->dev))
	{
		return;
	}
#endif
	if(pHTInfo->bCurrentAMPDUEnable)
	{
		if (!GetTs(ieee, (PTS_COMMON_INFO*)(&pTxTs), hdr->addr1, skb->priority, TX_DIR, true))
		{
			printk("===>can't get TS\n");
			return;
		}
		if (pTxTs->TxAdmittedBARecord.bValid == false)
		{
			//as some AP will refuse our action frame until key handshake has been finished. WB
			if (ieee->wpa_ie_len && (ieee->pairwise_key_type == KEY_TYPE_NA))
			;
			else
			TsStartAddBaProcess(ieee, pTxTs);
			goto FORCED_AGG_SETTING;
		}
		else if (pTxTs->bUsingBa == false)
		{
			if (SN_LESS(pTxTs->TxAdmittedBARecord.BaStartSeqCtrl.field.SeqNum, (pTxTs->TxCurSeq+1)%4096))
				pTxTs->bUsingBa = true;
			else
				goto FORCED_AGG_SETTING;
		}

		if (ieee->iw_mode == IW_MODE_INFRA)
		{
			tcb_desc->bAMPDUEnable = true;
			tcb_desc->ampdu_factor = pHTInfo->CurrentAMPDUFactor;
			tcb_desc->ampdu_density = pHTInfo->CurrentMPDUDensity;
		}
	}
FORCED_AGG_SETTING:
	switch(pHTInfo->ForcedAMPDUMode )
	{
		case HT_AGG_AUTO:
			break;

		case HT_AGG_FORCE_ENABLE:
			tcb_desc->bAMPDUEnable = true;
			tcb_desc->ampdu_density = pHTInfo->ForcedMPDUDensity;
			tcb_desc->ampdu_factor = pHTInfo->ForcedAMPDUFactor;
			break;

		case HT_AGG_FORCE_DISABLE:
			tcb_desc->bAMPDUEnable = false;
			tcb_desc->ampdu_density = 0;
			tcb_desc->ampdu_factor = 0;
			break;

	}
		return;
}

extern void ieee80211_qurey_ShortPreambleMode(struct ieee80211_device* ieee, cb_desc* tcb_desc)
{
	tcb_desc->bUseShortPreamble = false;
	if (tcb_desc->data_rate == 2)
	{//// 1M can only use Long Preamble. 11B spec
		return;
	}
	else if (ieee->current_network.capability & WLAN_CAPABILITY_SHORT_PREAMBLE)
	{
		tcb_desc->bUseShortPreamble = true;
	}
	return;
}
extern	void
ieee80211_query_HTCapShortGI(struct ieee80211_device *ieee, cb_desc *tcb_desc)
{
	PRT_HIGH_THROUGHPUT		pHTInfo = ieee->pHTInfo;

	tcb_desc->bUseShortGI 		= false;

	if(!pHTInfo->bCurrentHTSupport||!pHTInfo->bEnableHT)
		return;

	if(pHTInfo->bForcedShortGI)
	{
		tcb_desc->bUseShortGI = true;
		return;
	}

	if((pHTInfo->bCurBW40MHz==true) && pHTInfo->bCurShortGI40MHz)
		tcb_desc->bUseShortGI = true;
	else if((pHTInfo->bCurBW40MHz==false) && pHTInfo->bCurShortGI20MHz)
		tcb_desc->bUseShortGI = true;
}

void ieee80211_query_BandwidthMode(struct ieee80211_device* ieee, cb_desc *tcb_desc)
{
	PRT_HIGH_THROUGHPUT	pHTInfo = ieee->pHTInfo;

	tcb_desc->bPacketBW = false;

	if(!pHTInfo->bCurrentHTSupport||!pHTInfo->bEnableHT)
		return;

	if(tcb_desc->bMulticast || tcb_desc->bBroadcast)
		return;

	if((tcb_desc->data_rate & 0x80)==0) // If using legacy rate, it shall use 20MHz channel.
		return;
	//BandWidthAutoSwitch is for auto switch to 20 or 40 in long distance
	if(pHTInfo->bCurBW40MHz && pHTInfo->bCurTxBW40MHz && !ieee->bandwidth_auto_switch.bforced_tx20Mhz)
		tcb_desc->bPacketBW = true;
	return;
}

void ieee80211_query_protectionmode(struct ieee80211_device* ieee, cb_desc* tcb_desc, struct sk_buff* skb)
{
	// Common Settings
	tcb_desc->bRTSSTBC			= false;
	tcb_desc->bRTSUseShortGI		= false; // Since protection frames are always sent by legacy rate, ShortGI will never be used.
	tcb_desc->bCTSEnable			= false; // Most of protection using RTS/CTS
	tcb_desc->RTSSC				= 0;		// 20MHz: Don't care;  40MHz: Duplicate.
	tcb_desc->bRTSBW			= false; // RTS frame bandwidth is always 20MHz

	if(tcb_desc->bBroadcast || tcb_desc->bMulticast)//only unicast frame will use rts/cts
		return;

	if (is_broadcast_ether_addr(skb->data+16))  //check addr3 as infrastructure add3 is DA.
		return;

	if (ieee->mode < IEEE_N_24G) //b, g mode
	{
			// (1) RTS_Threshold is compared to the MPDU, not MSDU.
			// (2) If there are more than one frag in  this MSDU, only the first frag uses protection frame.
			//		Other fragments are protected by previous fragment.
			//		So we only need to check the length of first fragment.
		if (skb->len > ieee->rts)
		{
			tcb_desc->bRTSEnable = true;
			tcb_desc->rts_rate = MGN_24M;
		}
		else if (ieee->current_network.buseprotection)
		{
			// Use CTS-to-SELF in protection mode.
			tcb_desc->bRTSEnable = true;
			tcb_desc->bCTSEnable = true;
			tcb_desc->rts_rate = MGN_24M;
		}
		//otherwise return;
		return;
	}
	else
	{// 11n High throughput case.
		PRT_HIGH_THROUGHPUT pHTInfo = ieee->pHTInfo;
		while (true)
		{
			//check ERP protection
			if (ieee->current_network.buseprotection)
			{// CTS-to-SELF
				tcb_desc->bRTSEnable = true;
				tcb_desc->bCTSEnable = true;
				tcb_desc->rts_rate = MGN_24M;
				break;
			}
			//check HT op mode
			if(pHTInfo->bCurrentHTSupport  && pHTInfo->bEnableHT)
			{
				u8 HTOpMode = pHTInfo->CurrentOpMode;
				if((pHTInfo->bCurBW40MHz && (HTOpMode == 2 || HTOpMode == 3)) ||
							(!pHTInfo->bCurBW40MHz && HTOpMode == 3) )
				{
					tcb_desc->rts_rate = MGN_24M; // Rate is 24Mbps.
					tcb_desc->bRTSEnable = true;
					break;
				}
			}
			//check rts
			if (skb->len > ieee->rts)
			{
				tcb_desc->rts_rate = MGN_24M; // Rate is 24Mbps.
				tcb_desc->bRTSEnable = true;
				break;
			}
			//to do list: check MIMO power save condition.
			//check AMPDU aggregation for TXOP
			if(tcb_desc->bAMPDUEnable)
			{
				tcb_desc->rts_rate = MGN_24M; // Rate is 24Mbps.
				// According to 8190 design, firmware sends CF-End only if RTS/CTS is enabled. However, it degrads
				// throughput around 10M, so we disable of this mechanism. 2007.08.03 by Emily
				tcb_desc->bRTSEnable = false;
				break;
			}
			//check IOT action
			if(pHTInfo->IOTAction & HT_IOT_ACT_FORCED_CTS2SELF)
			{
				tcb_desc->bCTSEnable	= true;
				tcb_desc->rts_rate  = 	MGN_24M;
				tcb_desc->bRTSEnable = true;
				break;
			}
			// Totally no protection case!!
			goto NO_PROTECTION;
		}
		}
	// For test , CTS replace with RTS
	if( 0 )
	{
		tcb_desc->bCTSEnable	= true;
		tcb_desc->rts_rate = MGN_24M;
		tcb_desc->bRTSEnable 	= true;
	}
	if (ieee->current_network.capability & WLAN_CAPABILITY_SHORT_PREAMBLE)
		tcb_desc->bUseShortPreamble = true;
	if (ieee->mode == IW_MODE_MASTER)
			goto NO_PROTECTION;
	return;
NO_PROTECTION:
	tcb_desc->bRTSEnable	= false;
	tcb_desc->bCTSEnable	= false;
	tcb_desc->rts_rate		= 0;
	tcb_desc->RTSSC		= 0;
	tcb_desc->bRTSBW		= false;
}


void ieee80211_txrate_selectmode(struct ieee80211_device* ieee, cb_desc* tcb_desc)
{
#ifdef TO_DO_LIST
	if(!IsDataFrame(pFrame))
	{
		pTcb->bTxDisableRateFallBack = TRUE;
		pTcb->bTxUseDriverAssingedRate = TRUE;
		pTcb->RATRIndex = 7;
		return;
	}

	if(pMgntInfo->ForcedDataRate!= 0)
	{
		pTcb->bTxDisableRateFallBack = TRUE;
		pTcb->bTxUseDriverAssingedRate = TRUE;
		return;
	}
#endif
	if(ieee->bTxDisableRateFallBack)
		tcb_desc->bTxDisableRateFallBack = true;

	if(ieee->bTxUseDriverAssingedRate)
		tcb_desc->bTxUseDriverAssingedRate = true;
	if(!tcb_desc->bTxDisableRateFallBack || !tcb_desc->bTxUseDriverAssingedRate)
	{
		if (ieee->iw_mode == IW_MODE_INFRA || ieee->iw_mode == IW_MODE_ADHOC)
			tcb_desc->RATRIndex = 0;
	}
}

void ieee80211_query_seqnum(struct ieee80211_device*ieee, struct sk_buff* skb, u8* dst)
{
	if (is_multicast_ether_addr(dst) || is_broadcast_ether_addr(dst))
		return;
	if (IsQoSDataFrame(skb->data)) //we deal qos data only
	{
		PTX_TS_RECORD pTS = NULL;
		if (!GetTs(ieee, (PTS_COMMON_INFO*)(&pTS), dst, skb->priority, TX_DIR, true))
		{
			return;
		}
		pTS->TxCurSeq = (pTS->TxCurSeq+1)%4096;
	}
}

int ieee80211_rtl_xmit(struct sk_buff *skb, struct net_device *dev)
{
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,0))
	struct ieee80211_device *ieee = netdev_priv(dev);
#else
	struct ieee80211_device *ieee = (struct ieee80211_device *)dev->priv;
#endif
	struct ieee80211_txb *txb = NULL;
	struct ieee80211_hdr_3addrqos *frag_hdr;
	int i, bytes_per_frag, nr_frags, bytes_last_frag, frag_size;
	unsigned long flags;
	struct net_device_stats *stats = &ieee->stats;
	int ether_type = 0, encrypt;
	int bytes, fc, qos_ctl = 0, hdr_len;
	struct sk_buff *skb_frag;
	struct ieee80211_hdr_3addrqos header = { /* Ensure zero initialized */
		.duration_id = 0,
		.seq_ctl = 0,
		.qos_ctl = 0
	};
	u8 dest[ETH_ALEN], src[ETH_ALEN];
	int qos_actived = ieee->current_network.qos_data.active;

	struct ieee80211_crypt_data* crypt;
	bool    bdhcp =false;

	cb_desc *tcb_desc;

	spin_lock_irqsave(&ieee->lock, flags);

	/* If there is no driver handler to take the TXB, dont' bother
	 * creating it... */
	if ((!ieee->hard_start_xmit && !(ieee->softmac_features & IEEE_SOFTMAC_TX_QUEUE))||
	   ((!ieee->softmac_data_hard_start_xmit && (ieee->softmac_features & IEEE_SOFTMAC_TX_QUEUE)))) {
		printk(KERN_WARNING "%s: No xmit handler.\n",
		       ieee->dev->name);
		goto success;
	}


	if(likely(ieee->raw_tx == 0)){
		if (unlikely(skb->len < SNAP_SIZE + sizeof(u16))) {
			printk(KERN_WARNING "%s: skb too small (%d).\n",
			ieee->dev->name, skb->len);
			goto success;
		}

		memset(skb->cb, 0, sizeof(skb->cb));
		ether_type = ntohs(((struct ethhdr *)skb->data)->h_proto);

		crypt = ieee->crypt[ieee->tx_keyidx];

		encrypt = !(ether_type == ETH_P_PAE && ieee->ieee802_1x) &&
			ieee->host_encrypt && crypt && crypt->ops;

		if (!encrypt && ieee->ieee802_1x &&
		ieee->drop_unencrypted && ether_type != ETH_P_PAE) {
			stats->tx_dropped++;
			goto success;
		}
	#ifdef CONFIG_IEEE80211_DEBUG
		if (crypt && !encrypt && ether_type == ETH_P_PAE) {
			struct eapol *eap = (struct eapol *)(skb->data +
				sizeof(struct ethhdr) - SNAP_SIZE - sizeof(u16));
			IEEE80211_DEBUG_EAP("TX: IEEE 802.11 EAPOL frame: %s\n",
				eap_get_type(eap->type));
		}
	#endif

		// The following is for DHCP and ARP packet, we use cck1M to tx these packets and let LPS awake some time
		// to prevent DHCP protocol fail
		if (skb->len > 282){//MINIMUM_DHCP_PACKET_SIZE) {
			if (ETH_P_IP == ether_type) {// IP header
				const struct iphdr *ip = (struct iphdr *)((u8 *)skb->data+14);
				if (IPPROTO_UDP == ip->protocol) {//FIXME windows is 11 but here UDP in linux kernel is 17.
					struct udphdr *udp = (struct udphdr *)((u8 *)ip + (ip->ihl << 2));
					//if(((ntohs(udp->source) == 68) && (ntohs(udp->dest) == 67)) ||
					///   ((ntohs(udp->source) == 67) && (ntohs(udp->dest) == 68))) {
					if(((((u8 *)udp)[1] == 68) && (((u8 *)udp)[3] == 67)) ||
							((((u8 *)udp)[1] == 67) && (((u8 *)udp)[3] == 68))) {
						// 68 : UDP BOOTP client
						// 67 : UDP BOOTP server
						printk("DHCP pkt src port:%d, dest port:%d!!\n", ((u8 *)udp)[1],((u8 *)udp)[3]);
						// Use low rate to send DHCP packet.
						//if(pMgntInfo->IOTAction & HT_IOT_ACT_WA_IOT_Broadcom)
						//{
						//      tcb_desc->DataRate = MgntQuery_TxRateExcludeCCKRates(ieee);//0xc;//ofdm 6m
						//      tcb_desc->bTxDisableRateFallBack = false;
						//}
						//else
						//pTcb->DataRate = Adapter->MgntInfo.LowestBasicRate;
						//RTPRINT(FDM, WA_IOT, ("DHCP TranslateHeader(), pTcb->DataRate = 0x%x\n", pTcb->DataRate));

						bdhcp = true;
#ifdef _RTL8192_EXT_PATCH_
						ieee->LPSDelayCnt = 100;//pPSC->LPSAwakeIntvl*2; //AMY,090701
#else
						ieee->LPSDelayCnt = 100;//pPSC->LPSAwakeIntvl*2;
#endif
					}
				}
				}else if(ETH_P_ARP == ether_type){// IP ARP packet
					printk("=================>DHCP Protocol start tx ARP pkt!!\n");
					bdhcp = true;
					ieee->LPSDelayCnt = ieee->current_network.tim.tim_count;

					//if(pMgntInfo->IOTAction & HT_IOT_ACT_WA_IOT_Broadcom)
					//{
					//      tcb_desc->DataRate = MgntQuery_TxRateExcludeCCKRates(Adapter->MgntInfo.mBrates);//0xc;//ofdm 6m
					//      tcb_desc->bTxDisableRateFallBack = FALSE;
					//}
					//else
					//      tcb_desc->DataRate = Adapter->MgntInfo.LowestBasicRate;
					//RTPRINT(FDM, WA_IOT, ("ARP TranslateHeader(), pTcb->DataRate = 0x%x\n", pTcb->DataRate));

				}
			}

		/* Save source and destination addresses */
		memcpy(&dest, skb->data, ETH_ALEN);
		memcpy(&src, skb->data+ETH_ALEN, ETH_ALEN);

                /* Advance the SKB to the start of the payload */
                skb_pull(skb, sizeof(struct ethhdr));

                /* Determine total amount of storage required for TXB packets */
                bytes = skb->len + SNAP_SIZE + sizeof(u16);

		if (encrypt)
			fc = IEEE80211_FTYPE_DATA | IEEE80211_FCTL_WEP;
		else

                        fc = IEEE80211_FTYPE_DATA;

		//if(ieee->current_network.QoS_Enable)
		if(qos_actived)
			fc |= IEEE80211_STYPE_QOS_DATA;
		else
			fc |= IEEE80211_STYPE_DATA;

		if (ieee->iw_mode == IW_MODE_INFRA) {
			fc |= IEEE80211_FCTL_TODS;
			/* To DS: Addr1 = BSSID, Addr2 = SA,
			Addr3 = DA */
			memcpy(&header.addr1, ieee->current_network.bssid, ETH_ALEN);
			memcpy(&header.addr2, &src, ETH_ALEN);
			memcpy(&header.addr3, &dest, ETH_ALEN);
		} else if (ieee->iw_mode == IW_MODE_ADHOC) {
			/* not From/To DS: Addr1 = DA, Addr2 = SA,
			Addr3 = BSSID */
			memcpy(&header.addr1, dest, ETH_ALEN);
			memcpy(&header.addr2, src, ETH_ALEN);
			memcpy(&header.addr3, ieee->current_network.bssid, ETH_ALEN);
		}

                header.frame_ctl = cpu_to_le16(fc);

		/* Determine fragmentation size based on destination (multicast
		* and broadcast are not fragmented) */
		if (is_multicast_ether_addr(header.addr1) ||
		is_broadcast_ether_addr(header.addr1)) {
			frag_size = MAX_FRAG_THRESHOLD;
			qos_ctl |= QOS_CTL_NOTCONTAIN_ACK;
		}
		else {
			frag_size = ieee->fts;//default:392
			qos_ctl = 0;
		}

		//if (ieee->current_network.QoS_Enable)
		if(qos_actived)
		{
			hdr_len = IEEE80211_3ADDR_LEN + 2;

			skb->priority = ieee80211_classify(skb, &ieee->current_network);
			qos_ctl |= skb->priority; //set in the ieee80211_classify
			header.qos_ctl = cpu_to_le16(qos_ctl & IEEE80211_QOS_TID);
		} else {
			hdr_len = IEEE80211_3ADDR_LEN;
		}
		/* Determine amount of payload per fragment.  Regardless of if
		* this stack is providing the full 802.11 header, one will
		* eventually be affixed to this fragment -- so we must account for
		* it when determining the amount of payload space. */
		bytes_per_frag = frag_size - hdr_len;
		if (ieee->config &
		(CFG_IEEE80211_COMPUTE_FCS | CFG_IEEE80211_RESERVE_FCS))
			bytes_per_frag -= IEEE80211_FCS_LEN;

		/* Each fragment may need to have room for encryptiong pre/postfix */
		if (encrypt)
			bytes_per_frag -= crypt->ops->extra_prefix_len +
				crypt->ops->extra_postfix_len;

		/* Number of fragments is the total bytes_per_frag /
		* payload_per_fragment */
		nr_frags = bytes / bytes_per_frag;
		bytes_last_frag = bytes % bytes_per_frag;
		if (bytes_last_frag)
			nr_frags++;
		else
			bytes_last_frag = bytes_per_frag;

		/* When we allocate the TXB we allocate enough space for the reserve
		* and full fragment bytes (bytes_per_frag doesn't include prefix,
		* postfix, header, FCS, etc.) */
		txb = ieee80211_alloc_txb(nr_frags, frag_size + ieee->tx_headroom, GFP_ATOMIC);
		if (unlikely(!txb)) {
			printk(KERN_WARNING "%s: Could not allocate TXB\n",
			ieee->dev->name);
			goto failed;
		}
		txb->encrypted = encrypt;
		txb->payload_size = bytes;

		//if (ieee->current_network.QoS_Enable)
		if(qos_actived)
		{
			txb->queue_index = UP2AC(skb->priority);
		} else {
			txb->queue_index = WME_AC_BK;;
		}


		for (i = 0; i < nr_frags; i++) {
			skb_frag = txb->fragments[i];
			tcb_desc = (cb_desc *)(skb_frag->cb + MAX_DEV_ADDR_SIZE);
			if(qos_actived){
				skb_frag->priority = skb->priority;//UP2AC(skb->priority);
				tcb_desc->queue_index =  UP2AC(skb->priority);
			} else {
				skb_frag->priority = WME_AC_BK;
				tcb_desc->queue_index = WME_AC_BK;
			}
			skb_reserve(skb_frag, ieee->tx_headroom);

			if (encrypt){
				if (ieee->hwsec_active)
					tcb_desc->bHwSec = 1;
				else
					tcb_desc->bHwSec = 0;
				skb_reserve(skb_frag, crypt->ops->extra_prefix_len);
			}
			else
			{
				tcb_desc->bHwSec = 0;
			}
			frag_hdr = (struct ieee80211_hdr_3addrqos *)skb_put(skb_frag, hdr_len);
			memcpy(frag_hdr, &header, hdr_len);

			/* If this is not the last fragment, then add the MOREFRAGS
			* bit to the frame control */
			if (i != nr_frags - 1) {
				frag_hdr->frame_ctl = cpu_to_le16(
					fc | IEEE80211_FCTL_MOREFRAGS);
				bytes = bytes_per_frag;

			} else {
				/* The last fragment takes the remaining length */
				bytes = bytes_last_frag;
			}
			//if(ieee->current_network.QoS_Enable)
			if(qos_actived)
			{
				// add 1 only indicate to corresponding seq number control 2006/7/12
				frag_hdr->seq_ctl = cpu_to_le16(ieee->seq_ctrl[UP2AC(skb->priority)+1]<<4 | i);
			} else {
				frag_hdr->seq_ctl = cpu_to_le16(ieee->seq_ctrl[0]<<4 | i);
			}

			/* Put a SNAP header on the first fragment */
			if (i == 0) {
				ieee80211_put_snap(
					skb_put(skb_frag, SNAP_SIZE + sizeof(u16)),
					ether_type);
				bytes -= SNAP_SIZE + sizeof(u16);
			}

			memcpy(skb_put(skb_frag, bytes), skb->data, bytes);

			/* Advance the SKB... */
			skb_pull(skb, bytes);

			/* Encryption routine will move the header forward in order
			* to insert the IV between the header and the payload */
			if (encrypt)
				ieee80211_encrypt_fragment(ieee, skb_frag, hdr_len);
			if (ieee->config &
			(CFG_IEEE80211_COMPUTE_FCS | CFG_IEEE80211_RESERVE_FCS))
				skb_put(skb_frag, 4);
		}

		if(qos_actived)
		{
		  if (ieee->seq_ctrl[UP2AC(skb->priority) + 1] == 0xFFF)
			ieee->seq_ctrl[UP2AC(skb->priority) + 1] = 0;
		  else
			ieee->seq_ctrl[UP2AC(skb->priority) + 1]++;
		} else {
  		  if (ieee->seq_ctrl[0] == 0xFFF)
			ieee->seq_ctrl[0] = 0;
		  else
			ieee->seq_ctrl[0]++;
		}
	}else{
		if (unlikely(skb->len < sizeof(struct ieee80211_hdr_3addr))) {
			printk(KERN_WARNING "%s: skb too small (%d).\n",
			ieee->dev->name, skb->len);
			goto success;
		}

		txb = ieee80211_alloc_txb(1, skb->len, GFP_ATOMIC);
		if(!txb){
			printk(KERN_WARNING "%s: Could not allocate TXB\n",
			ieee->dev->name);
			goto failed;
		}

		txb->encrypted = 0;
		txb->payload_size = skb->len;
		memcpy(skb_put(txb->fragments[0],skb->len), skb->data, skb->len);
	}

 success:
//WB add to fill data tcb_desc here. only first fragment is considered, need to change, and you may remove to other place.
	if (txb)
	{
#if 1
		cb_desc *tcb_desc = (cb_desc *)(txb->fragments[0]->cb + MAX_DEV_ADDR_SIZE);
		tcb_desc->bTxEnableFwCalcDur = 1;
		if (is_multicast_ether_addr(header.addr1))
			tcb_desc->bMulticast = 1;
		if (is_broadcast_ether_addr(header.addr1))
			tcb_desc->bBroadcast = 1;
		ieee80211_txrate_selectmode(ieee, tcb_desc);
		if ( tcb_desc->bMulticast ||  tcb_desc->bBroadcast)
			tcb_desc->data_rate = ieee->basic_rate;
		else
			//tcb_desc->data_rate = CURRENT_RATE(ieee->current_network.mode, ieee->rate, ieee->HTCurrentOperaRate);
			tcb_desc->data_rate = CURRENT_RATE(ieee->mode, ieee->rate, ieee->HTCurrentOperaRate);

		if(bdhcp == true){
			// Use low rate to send DHCP packet.
			//if(ieee->pHTInfo->IOTAction & HT_IOT_ACT_WA_IOT_Broadcom) {
			//	tcb_desc->data_rate = MGN_1M;//MgntQuery_TxRateExcludeCCKRates(ieee);//0xc;//ofdm 6m
			//	tcb_desc->bTxDisableRateFallBack = false;
			//}
			//else
			{
				tcb_desc->data_rate = MGN_1M;
				tcb_desc->bTxDisableRateFallBack = 1;
			}

			tcb_desc->RATRIndex = 7;
			tcb_desc->bTxUseDriverAssingedRate = 1;
			tcb_desc->bdhcp = 1;
		}


		ieee80211_qurey_ShortPreambleMode(ieee, tcb_desc);
		ieee80211_tx_query_agg_cap(ieee, txb->fragments[0], tcb_desc);
		ieee80211_query_HTCapShortGI(ieee, tcb_desc);
		ieee80211_query_BandwidthMode(ieee, tcb_desc);
		ieee80211_query_protectionmode(ieee, tcb_desc, txb->fragments[0]);
		ieee80211_query_seqnum(ieee, txb->fragments[0], header.addr1);
//		IEEE80211_DEBUG_DATA(IEEE80211_DL_DATA, txb->fragments[0]->data, txb->fragments[0]->len);
		//IEEE80211_DEBUG_DATA(IEEE80211_DL_DATA, tcb_desc, sizeof(cb_desc));
#endif
	}
	spin_unlock_irqrestore(&ieee->lock, flags);
	dev_kfree_skb_any(skb);
	if (txb) {
		if (ieee->softmac_features & IEEE_SOFTMAC_TX_QUEUE){
			ieee80211_softmac_xmit(txb, ieee);
		}else{
			if ((*ieee->hard_start_xmit)(txb, dev) == 0) {
				stats->tx_packets++;
				stats->tx_bytes += txb->payload_size;
				return 0;
			}
			ieee80211_txb_free(txb);
		}
	}

	return 0;

 failed:
	spin_unlock_irqrestore(&ieee->lock, flags);
	netif_stop_queue(dev);
	stats->tx_errors++;
	return 1;

}

//EXPORT_SYMBOL(ieee80211_txb_free);