![Charles Clément](/assets/img/avatar_default.png)
Signed-off-by: Charles Clément <caratorn@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
251 lines
8.4 KiB
C
251 lines
8.4 KiB
C
/*
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* Copyright (c) 1996, 2003 VIA Networking Technologies, Inc.
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* All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* File: wctl.c
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*
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* Purpose: handle WMAC duplicate filter & defragment
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*
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* Author: Jerry Chen
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*
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* Date: Jun. 27, 2002
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*
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* Functions:
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* WCTLbIsDuplicate - Test if duplicate packet
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* WCTLuSearchDFCB - Search DeFragment Control Database
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* WCTLuInsertDFCB - Insert DeFragment Control Database
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* WCTLbHandleFragment - Handle received fragment packet
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*
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* Revision History:
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*
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*/
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#include "wctl.h"
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#include "device.h"
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#include "card.h"
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/*--------------------- Static Definitions -------------------------*/
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/*--------------------- Static Classes ----------------------------*/
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/*--------------------- Static Variables --------------------------*/
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// static int msglevel =MSG_LEVEL_INFO;
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/*--------------------- Static Functions --------------------------*/
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/*--------------------- Export Variables --------------------------*/
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/*
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* Description:
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* Scan Rx cache. Return true if packet is duplicate, else
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* inserts in receive cache and returns false.
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*
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* Parameters:
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* In:
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* pCache - Receive packets history
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* pMACHeader - 802.11 MAC Header of received packet
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* Out:
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* none
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*
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* Return Value: true if packet duplicate; otherwise false
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*
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*/
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bool WCTLbIsDuplicate (PSCache pCache, PS802_11Header pMACHeader)
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{
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unsigned int uIndex;
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unsigned int ii;
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PSCacheEntry pCacheEntry;
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if (IS_FC_RETRY(pMACHeader)) {
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uIndex = pCache->uInPtr;
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for (ii = 0; ii < DUPLICATE_RX_CACHE_LENGTH; ii++) {
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pCacheEntry = &(pCache->asCacheEntry[uIndex]);
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if ((pCacheEntry->wFmSequence == pMACHeader->wSeqCtl) &&
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(!compare_ether_addr(&(pCacheEntry->abyAddr2[0]), &(pMACHeader->abyAddr2[0])))
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) {
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/* Duplicate match */
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return true;
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}
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ADD_ONE_WITH_WRAP_AROUND(uIndex, DUPLICATE_RX_CACHE_LENGTH);
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}
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}
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/* Not fount in cache - insert */
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pCacheEntry = &pCache->asCacheEntry[pCache->uInPtr];
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pCacheEntry->wFmSequence = pMACHeader->wSeqCtl;
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memcpy(&(pCacheEntry->abyAddr2[0]), &(pMACHeader->abyAddr2[0]), ETH_ALEN);
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ADD_ONE_WITH_WRAP_AROUND(pCache->uInPtr, DUPLICATE_RX_CACHE_LENGTH);
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return false;
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}
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/*
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* Description:
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* Found if sequence number of received fragment packet in Defragment Database
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*
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* Parameters:
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* In:
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* pDevice - Pointer to adapter
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* pMACHeader - 802.11 MAC Header of received packet
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* Out:
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* none
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*
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* Return Value: index number in Defragment Database
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*
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*/
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unsigned int WCTLuSearchDFCB (PSDevice pDevice, PS802_11Header pMACHeader)
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{
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unsigned int ii;
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for(ii=0;ii<pDevice->cbDFCB;ii++) {
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if ((pDevice->sRxDFCB[ii].bInUse == true) &&
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(!compare_ether_addr(&(pDevice->sRxDFCB[ii].abyAddr2[0]), &(pMACHeader->abyAddr2[0])))
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) {
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//
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return(ii);
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}
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}
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return(pDevice->cbDFCB);
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}
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/*
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* Description:
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* Insert received fragment packet in Defragment Database
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*
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* Parameters:
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* In:
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* pDevice - Pointer to adapter
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* pMACHeader - 802.11 MAC Header of received packet
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* Out:
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* none
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*
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* Return Value: index number in Defragment Database
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*
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*/
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unsigned int WCTLuInsertDFCB (PSDevice pDevice, PS802_11Header pMACHeader)
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{
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unsigned int ii;
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if (pDevice->cbFreeDFCB == 0)
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return(pDevice->cbDFCB);
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for(ii=0;ii<pDevice->cbDFCB;ii++) {
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if (pDevice->sRxDFCB[ii].bInUse == false) {
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pDevice->cbFreeDFCB--;
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pDevice->sRxDFCB[ii].uLifetime = pDevice->dwMaxReceiveLifetime;
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pDevice->sRxDFCB[ii].bInUse = true;
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pDevice->sRxDFCB[ii].wSequence = (pMACHeader->wSeqCtl >> 4);
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pDevice->sRxDFCB[ii].wFragNum = (pMACHeader->wSeqCtl & 0x000F);
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memcpy(&(pDevice->sRxDFCB[ii].abyAddr2[0]), &(pMACHeader->abyAddr2[0]), ETH_ALEN);
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return(ii);
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}
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}
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return(pDevice->cbDFCB);
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}
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/*
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* Description:
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* Handle received fragment packet
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*
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* Parameters:
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* In:
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* pDevice - Pointer to adapter
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* pMACHeader - 802.11 MAC Header of received packet
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* cbFrameLength - Frame length
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* bWEP - is WEP packet
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* Out:
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* none
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*
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* Return Value: true if it is valid fragment packet and we have resource to defragment; otherwise false
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*
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*/
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bool WCTLbHandleFragment (PSDevice pDevice, PS802_11Header pMACHeader, unsigned int cbFrameLength, bool bWEP, bool bExtIV)
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{
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unsigned int uHeaderSize;
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if (bWEP == true) {
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uHeaderSize = 28;
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if (bExtIV)
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// ExtIV
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uHeaderSize +=4;
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}
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else {
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uHeaderSize = 24;
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}
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if (IS_FIRST_FRAGMENT_PKT(pMACHeader)) {
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pDevice->uCurrentDFCBIdx = WCTLuSearchDFCB(pDevice, pMACHeader);
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if (pDevice->uCurrentDFCBIdx < pDevice->cbDFCB) {
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// duplicate, we must flush previous DCB
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pDevice->sRxDFCB[pDevice->uCurrentDFCBIdx].uLifetime = pDevice->dwMaxReceiveLifetime;
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pDevice->sRxDFCB[pDevice->uCurrentDFCBIdx].wSequence = (pMACHeader->wSeqCtl >> 4);
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pDevice->sRxDFCB[pDevice->uCurrentDFCBIdx].wFragNum = (pMACHeader->wSeqCtl & 0x000F);
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}
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else {
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pDevice->uCurrentDFCBIdx = WCTLuInsertDFCB(pDevice, pMACHeader);
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if (pDevice->uCurrentDFCBIdx == pDevice->cbDFCB) {
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return(false);
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}
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}
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// reserve 4 byte to match MAC RX Buffer
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pDevice->sRxDFCB[pDevice->uCurrentDFCBIdx].pbyRxBuffer = (unsigned char *) (pDevice->sRxDFCB[pDevice->uCurrentDFCBIdx].skb->data + 4);
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memcpy(pDevice->sRxDFCB[pDevice->uCurrentDFCBIdx].pbyRxBuffer, pMACHeader, cbFrameLength);
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pDevice->sRxDFCB[pDevice->uCurrentDFCBIdx].cbFrameLength = cbFrameLength;
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pDevice->sRxDFCB[pDevice->uCurrentDFCBIdx].pbyRxBuffer += cbFrameLength;
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pDevice->sRxDFCB[pDevice->uCurrentDFCBIdx].wFragNum++;
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//DBG_PRT(MSG_LEVEL_DEBUG, KERN_INFO "First pDevice->uCurrentDFCBIdx= %d\n", pDevice->uCurrentDFCBIdx);
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return(false);
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}
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else {
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pDevice->uCurrentDFCBIdx = WCTLuSearchDFCB(pDevice, pMACHeader);
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if (pDevice->uCurrentDFCBIdx != pDevice->cbDFCB) {
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if ((pDevice->sRxDFCB[pDevice->uCurrentDFCBIdx].wSequence == (pMACHeader->wSeqCtl >> 4)) &&
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(pDevice->sRxDFCB[pDevice->uCurrentDFCBIdx].wFragNum == (pMACHeader->wSeqCtl & 0x000F)) &&
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((pDevice->sRxDFCB[pDevice->uCurrentDFCBIdx].cbFrameLength + cbFrameLength - uHeaderSize) < 2346)) {
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memcpy(pDevice->sRxDFCB[pDevice->uCurrentDFCBIdx].pbyRxBuffer, ((unsigned char *) (pMACHeader) + uHeaderSize), (cbFrameLength - uHeaderSize));
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pDevice->sRxDFCB[pDevice->uCurrentDFCBIdx].cbFrameLength += (cbFrameLength - uHeaderSize);
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pDevice->sRxDFCB[pDevice->uCurrentDFCBIdx].pbyRxBuffer += (cbFrameLength - uHeaderSize);
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pDevice->sRxDFCB[pDevice->uCurrentDFCBIdx].wFragNum++;
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//DBG_PRT(MSG_LEVEL_DEBUG, KERN_INFO "Second pDevice->uCurrentDFCBIdx= %d\n", pDevice->uCurrentDFCBIdx);
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}
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else {
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// seq error or frag # error flush DFCB
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pDevice->cbFreeDFCB++;
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pDevice->sRxDFCB[pDevice->uCurrentDFCBIdx].bInUse = false;
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return(false);
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}
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}
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else {
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return(false);
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}
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if (IS_LAST_FRAGMENT_PKT(pMACHeader)) {
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//enq defragcontrolblock
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pDevice->cbFreeDFCB++;
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pDevice->sRxDFCB[pDevice->uCurrentDFCBIdx].bInUse = false;
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//DBG_PRT(MSG_LEVEL_DEBUG, KERN_INFO "Last pDevice->uCurrentDFCBIdx= %d\n", pDevice->uCurrentDFCBIdx);
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return(true);
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}
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return(false);
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}
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}
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