cregit-Linux how code gets into the kernel

Release 4.7 drivers/staging/rtl8192u/ieee80211/ieee80211_tx.c

Directory: drivers/staging/rtl8192u/ieee80211
/******************************************************************************

  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 <andrea.merello@gmail.com>

  A special thanks goes to Realtek for their support !

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

#include <linux/compiler.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 <linux/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);
}


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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", __func__);
		return -1;
	}

	if (ieee->tkip_countermeasures &&
	    crypt && crypt->ops && strcmp(crypt->ops->name, "TKIP") == 0) {
		if (net_ratelimit()) {
			struct rtl_80211_hdr_3addrqos *header;

			header = (struct rtl_80211_hdr_3addrqos *)frag->data;
			printk(KERN_DEBUG "%s: TKIP countermeasures: dropped "
			       "TX packet to %pM\n",
			       ieee->dev->name, header->addr1);
		}
		return -1;
	}

	/* 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;
}



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void ieee80211_txb_free(struct ieee80211_txb *txb) {
	//int i;
	if (unlikely(!txb))
		return;
	kfree(txb);
}

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EXPORT_SYMBOL(ieee80211_txb_free);




static struct ieee80211_txb *ieee80211_alloc_txb(int nr_frags, int txb_size,
						 gfp_t 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;
}


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// 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);
	ip = ip_hdr(skb);
	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;
	}
}


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#define SN_LESS(a, b)		(((a-b)&0x800)!=0)



static 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 rtl_80211_hdr_1addr *hdr = (struct rtl_80211_hdr_1addr *)skb->data;

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

	if (is_multicast_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(!ieee->GetNmodeSupportBySecCfg(ieee->dev))
	{
		return;
	}
	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)
		{
			TsStartAddBaProcess(ieee, pTxTs);
			goto FORCED_AGG_SETTING;
		}
		else if (!pTxTs->bUsingBa)
		{
			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;
}


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static 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;
}

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static 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;
}


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static 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;
}


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static 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;
}



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static 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;
	}
}


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static void ieee80211_query_seqnum(struct ieee80211_device *ieee,
				   struct sk_buff *skb, u8 *dst)
{
	if (is_multicast_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;
	}
}


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int ieee80211_xmit(struct sk_buff *skb, struct net_device *dev)
{
	struct ieee80211_device *ieee = netdev_priv(dev);
	struct ieee80211_txb *txb = NULL;
	struct rtl_80211_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 rtl_80211_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;

	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

		/* 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)) {
			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 encryption 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 rtl_80211_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 rtl_80211_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)
	{
		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);
		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));
	}
	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;

}

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Directory: drivers/staging/rtl8192u/ieee80211



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