/*
* 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"
/*--------------------- 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)
{
unsigned int uIndex;
unsigned int 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) &&
ether_addr_equal(pCacheEntry->abyAddr2,
pMACHeader->abyAddr2)) {
/* 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]), ETH_ALEN);
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
*
*/
unsigned int WCTLuSearchDFCB(PSDevice pDevice, PS802_11Header pMACHeader)
{
unsigned int ii;
for (ii = 0; ii < pDevice->cbDFCB; ii++) {
if (pDevice->sRxDFCB[ii].bInUse &&
ether_addr_equal(pDevice->sRxDFCB[ii].abyAddr2,
pMACHeader->abyAddr2)) {
//
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
*
*/
unsigned int WCTLuInsertDFCB(PSDevice pDevice, PS802_11Header pMACHeader)
{
unsigned int ii;
if (pDevice->cbFreeDFCB == 0)
return pDevice->cbDFCB;
for (ii = 0; ii < pDevice->cbDFCB; ii++) {
if (!pDevice->sRxDFCB[ii].bInUse) {
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]), ETH_ALEN);
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, unsigned int cbFrameLength, bool bWEP, bool bExtIV)
{
unsigned int uHeaderSize;
if (bWEP) {
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 4 byte to match MAC RX Buffer
pDevice->sRxDFCB[pDevice->uCurrentDFCBIdx].pbyRxBuffer = (unsigned char *)(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, ((unsigned char *)(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;
}
}