| /* |
| * 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) && |
| (!compare_ether_addr(&(pCacheEntry->abyAddr2[0]), &(pMACHeader->abyAddr2[0]))) |
| ) { |
| /* 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 == true) && |
| (!compare_ether_addr(&(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 |
| * |
| */ |
| 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 == 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]), 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 == 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 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); |
| } |
| } |
| |
| |
