Linux-2.6.33.2/drivers/staging/vt6656/wctl.c
/*
* Copyright (c) 1996, 2003 VIA Networking Technologies, Inc.
* All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* 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.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* File: wctl.c
*
* Purpose: handle WMAC duplicate filter & defragment
*
* Author: Jerry Chen
*
* Date: Jun. 27, 2002
*
* Functions:
* WCTLbIsDuplicate - Test if duplicate packet
* WCTLuSearchDFCB - Search DeFragment Control Database
* WCTLuInsertDFCB - Insert DeFragment Control Database
* WCTLbHandleFragment - Handle received fragment packet
*
* Revision History:
*
*/
#include "wctl.h"
#include "device.h"
#include "card.h"
#include "tmacro.h"
/*--------------------- Static Definitions -------------------------*/
/*--------------------- Static Classes ----------------------------*/
/*--------------------- Static Variables --------------------------*/
// static int msglevel =MSG_LEVEL_INFO;
/*--------------------- Static Functions --------------------------*/
/*--------------------- Export Variables --------------------------*/
/*
* Description:
* Scan Rx cache. Return TRUE if packet is duplicate, else
* inserts in receive cache and returns FALSE.
*
* Parameters:
* In:
* pCache - Receive packets history
* pMACHeader - 802.11 MAC Header of received packet
* Out:
* none
*
* Return Value: TRUE if packet duplicate; otherwise FALSE
*
*/
BOOL WCTLbIsDuplicate (PSCache pCache, PS802_11Header pMACHeader)
{
UINT uIndex;
UINT ii;
PSCacheEntry pCacheEntry;
if (IS_FC_RETRY(pMACHeader)) {
uIndex = pCache->uInPtr;
for (ii = 0; ii < DUPLICATE_RX_CACHE_LENGTH; ii++) {
pCacheEntry = &(pCache->asCacheEntry[uIndex]);
if ((pCacheEntry->wFmSequence == pMACHeader->wSeqCtl) &&
(IS_ETH_ADDRESS_EQUAL (&(pCacheEntry->abyAddr2[0]), &(pMACHeader->abyAddr2[0]))) &&
(LOBYTE(pCacheEntry->wFrameCtl) == LOBYTE(pMACHeader->wFrameCtl))
) {
/* Duplicate match */
return TRUE;
}
ADD_ONE_WITH_WRAP_AROUND(uIndex, DUPLICATE_RX_CACHE_LENGTH);
}
}
/* Not fount in cache - insert */
pCacheEntry = &pCache->asCacheEntry[pCache->uInPtr];
pCacheEntry->wFmSequence = pMACHeader->wSeqCtl;
memcpy(&(pCacheEntry->abyAddr2[0]), &(pMACHeader->abyAddr2[0]), U_ETHER_ADDR_LEN);
pCacheEntry->wFrameCtl = pMACHeader->wFrameCtl;
ADD_ONE_WITH_WRAP_AROUND(pCache->uInPtr, DUPLICATE_RX_CACHE_LENGTH);
return FALSE;
}
/*
* Description:
* Found if sequence number of received fragment packet in Defragment Database
*
* Parameters:
* In:
* pDevice - Pointer to adapter
* pMACHeader - 802.11 MAC Header of received packet
* Out:
* none
*
* Return Value: index number in Defragment Database
*
*/
UINT WCTLuSearchDFCB (PSDevice pDevice, PS802_11Header pMACHeader)
{
UINT ii;
for(ii=0;ii<pDevice->cbDFCB;ii++) {
if ((pDevice->sRxDFCB[ii].bInUse == TRUE) &&
(IS_ETH_ADDRESS_EQUAL (&(pDevice->sRxDFCB[ii].abyAddr2[0]), &(pMACHeader->abyAddr2[0])))
) {
//
return(ii);
}
}
return(pDevice->cbDFCB);
}
/*
* Description:
* Insert received fragment packet in Defragment Database
*
* Parameters:
* In:
* pDevice - Pointer to adapter
* pMACHeader - 802.11 MAC Header of received packet
* Out:
* none
*
* Return Value: index number in Defragment Database
*
*/
UINT WCTLuInsertDFCB (PSDevice pDevice, PS802_11Header pMACHeader)
{
UINT ii;
if (pDevice->cbFreeDFCB == 0)
return(pDevice->cbDFCB);
for(ii=0;ii<pDevice->cbDFCB;ii++) {
if (pDevice->sRxDFCB[ii].bInUse == FALSE) {
pDevice->cbFreeDFCB--;
pDevice->sRxDFCB[ii].uLifetime = pDevice->dwMaxReceiveLifetime;
pDevice->sRxDFCB[ii].bInUse = TRUE;
pDevice->sRxDFCB[ii].wSequence = (pMACHeader->wSeqCtl >> 4);
pDevice->sRxDFCB[ii].wFragNum = (pMACHeader->wSeqCtl & 0x000F);
memcpy(&(pDevice->sRxDFCB[ii].abyAddr2[0]), &(pMACHeader->abyAddr2[0]), U_ETHER_ADDR_LEN);
return(ii);
}
}
return(pDevice->cbDFCB);
}
/*
* Description:
* Handle received fragment packet
*
* Parameters:
* In:
* pDevice - Pointer to adapter
* pMACHeader - 802.11 MAC Header of received packet
* cbFrameLength - Frame length
* bWEP - is WEP packet
* Out:
* none
*
* Return Value: TRUE if it is valid fragment packet and we have resource to defragment; otherwise FALSE
*
*/
BOOL WCTLbHandleFragment (PSDevice pDevice, PS802_11Header pMACHeader, UINT cbFrameLength, BOOL bWEP, BOOL bExtIV)
{
UINT uHeaderSize;
if (bWEP == TRUE) {
uHeaderSize = 28;
if (bExtIV)
// ExtIV
uHeaderSize +=4;
}
else {
uHeaderSize = 24;
}
if (IS_FIRST_FRAGMENT_PKT(pMACHeader)) {
pDevice->uCurrentDFCBIdx = WCTLuSearchDFCB(pDevice, pMACHeader);
if (pDevice->uCurrentDFCBIdx < pDevice->cbDFCB) {
// duplicate, we must flush previous DCB
pDevice->sRxDFCB[pDevice->uCurrentDFCBIdx].uLifetime = pDevice->dwMaxReceiveLifetime;
pDevice->sRxDFCB[pDevice->uCurrentDFCBIdx].wSequence = (pMACHeader->wSeqCtl >> 4);
pDevice->sRxDFCB[pDevice->uCurrentDFCBIdx].wFragNum = (pMACHeader->wSeqCtl & 0x000F);
}
else {
pDevice->uCurrentDFCBIdx = WCTLuInsertDFCB(pDevice, pMACHeader);
if (pDevice->uCurrentDFCBIdx == pDevice->cbDFCB) {
return(FALSE);
}
}
// reserve 8 byte to match MAC RX Buffer
pDevice->sRxDFCB[pDevice->uCurrentDFCBIdx].pbyRxBuffer = (PBYTE) (pDevice->sRxDFCB[pDevice->uCurrentDFCBIdx].skb->data + 8);
// pDevice->sRxDFCB[pDevice->uCurrentDFCBIdx].pbyRxBuffer = (PBYTE) (pDevice->sRxDFCB[pDevice->uCurrentDFCBIdx].skb->data + 4);
memcpy(pDevice->sRxDFCB[pDevice->uCurrentDFCBIdx].pbyRxBuffer, pMACHeader, cbFrameLength);
pDevice->sRxDFCB[pDevice->uCurrentDFCBIdx].cbFrameLength = cbFrameLength;
pDevice->sRxDFCB[pDevice->uCurrentDFCBIdx].pbyRxBuffer += cbFrameLength;
pDevice->sRxDFCB[pDevice->uCurrentDFCBIdx].wFragNum++;
//DBG_PRT(MSG_LEVEL_DEBUG, KERN_INFO "First pDevice->uCurrentDFCBIdx= %d\n", pDevice->uCurrentDFCBIdx);
return(FALSE);
}
else {
pDevice->uCurrentDFCBIdx = WCTLuSearchDFCB(pDevice, pMACHeader);
if (pDevice->uCurrentDFCBIdx != pDevice->cbDFCB) {
if ((pDevice->sRxDFCB[pDevice->uCurrentDFCBIdx].wSequence == (pMACHeader->wSeqCtl >> 4)) &&
(pDevice->sRxDFCB[pDevice->uCurrentDFCBIdx].wFragNum == (pMACHeader->wSeqCtl & 0x000F)) &&
((pDevice->sRxDFCB[pDevice->uCurrentDFCBIdx].cbFrameLength + cbFrameLength - uHeaderSize) < 2346)) {
memcpy(pDevice->sRxDFCB[pDevice->uCurrentDFCBIdx].pbyRxBuffer, ((PBYTE) (pMACHeader) + uHeaderSize), (cbFrameLength - uHeaderSize));
pDevice->sRxDFCB[pDevice->uCurrentDFCBIdx].cbFrameLength += (cbFrameLength - uHeaderSize);
pDevice->sRxDFCB[pDevice->uCurrentDFCBIdx].pbyRxBuffer += (cbFrameLength - uHeaderSize);
pDevice->sRxDFCB[pDevice->uCurrentDFCBIdx].wFragNum++;
//DBG_PRT(MSG_LEVEL_DEBUG, KERN_INFO "Second pDevice->uCurrentDFCBIdx= %d\n", pDevice->uCurrentDFCBIdx);
}
else {
// seq error or frag # error flush DFCB
pDevice->cbFreeDFCB++;
pDevice->sRxDFCB[pDevice->uCurrentDFCBIdx].bInUse = FALSE;
return(FALSE);
}
}
else {
return(FALSE);
}
if (IS_LAST_FRAGMENT_PKT(pMACHeader)) {
//enq defragcontrolblock
pDevice->cbFreeDFCB++;
pDevice->sRxDFCB[pDevice->uCurrentDFCBIdx].bInUse = FALSE;
//DBG_PRT(MSG_LEVEL_DEBUG, KERN_INFO "Last pDevice->uCurrentDFCBIdx= %d\n", pDevice->uCurrentDFCBIdx);
return(TRUE);
}
return(FALSE);
}
}