diff options
Diffstat (limited to 'drivers/staging/vt6656/wctl.c')
| -rw-r--r-- | drivers/staging/vt6656/wctl.c | 244 |
1 files changed, 244 insertions, 0 deletions
diff --git a/drivers/staging/vt6656/wctl.c b/drivers/staging/vt6656/wctl.c new file mode 100644 index 00000000000..efdc5d5d38e --- /dev/null +++ b/drivers/staging/vt6656/wctl.c @@ -0,0 +1,244 @@ +/* + * 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 int msglevel =MSG_LEVEL_INFO; + +/* + * 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, struct ieee80211_hdr *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->seq_ctrl) && + ether_addr_equal(pCacheEntry->abyAddr2, pMACHeader->addr2) && + (pCacheEntry->wFrameCtl == pMACHeader->frame_control) + ) { + /* Duplicate match */ + return true; + } + ADD_ONE_WITH_WRAP_AROUND(uIndex, DUPLICATE_RX_CACHE_LENGTH); + } + } + /* Not found in cache - insert */ + pCacheEntry = &pCache->asCacheEntry[pCache->uInPtr]; + pCacheEntry->wFmSequence = pMACHeader->seq_ctrl; + memcpy(&(pCacheEntry->abyAddr2[0]), &(pMACHeader->addr2[0]), ETH_ALEN); + pCacheEntry->wFrameCtl = pMACHeader->frame_control; + 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(struct vnt_private *pDevice, + struct ieee80211_hdr *pMACHeader) +{ + unsigned int ii; + + for (ii = 0; ii < pDevice->cbDFCB; ii++) { + if ((pDevice->sRxDFCB[ii].bInUse == true) && + ether_addr_equal(pDevice->sRxDFCB[ii].abyAddr2, + pMACHeader->addr2)) { + 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(struct vnt_private *pDevice, + struct ieee80211_hdr *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->seq_ctrl >> 4); + pDevice->sRxDFCB[ii].wFragNum = (pMACHeader->seq_ctrl & 0x000F); + memcpy(&(pDevice->sRxDFCB[ii].abyAddr2[0]), + &(pMACHeader->addr2[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(struct vnt_private *pDevice, struct ieee80211_hdr *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->seq_ctrl >> 4); + pDevice->sRxDFCB[pDevice->uCurrentDFCBIdx].wFragNum = (pMACHeader->seq_ctrl & 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 = (u8 *) (pDevice->sRxDFCB[pDevice->uCurrentDFCBIdx].skb->data + 8); +// pDevice->sRxDFCB[pDevice->uCurrentDFCBIdx].pbyRxBuffer = (u8 *) (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->seq_ctrl >> 4)) && + (pDevice->sRxDFCB[pDevice->uCurrentDFCBIdx].wFragNum == (pMACHeader->seq_ctrl & 0x000F)) && + ((pDevice->sRxDFCB[pDevice->uCurrentDFCBIdx].cbFrameLength + cbFrameLength - uHeaderSize) < 2346)) { + + memcpy(pDevice->sRxDFCB[pDevice->uCurrentDFCBIdx].pbyRxBuffer, ((u8 *) (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); + } +} + |