2 * Copyright (c) 1996, 2003 VIA Networking Technologies, Inc.
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License along
16 * with this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
21 * Purpose: handle WMAC duplicate filter & defragment
28 * WCTLbIsDuplicate - Test if duplicate packet
29 * WCTLuSearchDFCB - Search DeFragment Control Database
30 * WCTLuInsertDFCB - Insert DeFragment Control Database
31 * WCTLbHandleFragment - Handle received fragment packet
42 // static int msglevel =MSG_LEVEL_INFO;
46 * Scan Rx cache. Return true if packet is duplicate, else
47 * inserts in receive cache and returns false.
51 * pCache - Receive packets history
52 * pMACHeader - 802.11 MAC Header of received packet
56 * Return Value: true if packet duplicate; otherwise false
60 bool WCTLbIsDuplicate (PSCache pCache, struct ieee80211_hdr *pMACHeader)
64 PSCacheEntry pCacheEntry;
66 if (IS_FC_RETRY(pMACHeader)) {
68 uIndex = pCache->uInPtr;
69 for (ii = 0; ii < DUPLICATE_RX_CACHE_LENGTH; ii++) {
70 pCacheEntry = &(pCache->asCacheEntry[uIndex]);
71 if ((pCacheEntry->wFmSequence == pMACHeader->seq_ctrl) &&
72 (!compare_ether_addr(&(pCacheEntry->abyAddr2[0]),
73 &(pMACHeader->addr2[0]))) &&
74 (LOBYTE(pCacheEntry->wFrameCtl) == LOBYTE(pMACHeader->frame_control))
79 ADD_ONE_WITH_WRAP_AROUND(uIndex, DUPLICATE_RX_CACHE_LENGTH);
82 /* Not found in cache - insert */
83 pCacheEntry = &pCache->asCacheEntry[pCache->uInPtr];
84 pCacheEntry->wFmSequence = pMACHeader->seq_ctrl;
85 memcpy(&(pCacheEntry->abyAddr2[0]), &(pMACHeader->addr2[0]), ETH_ALEN);
86 pCacheEntry->wFrameCtl = pMACHeader->frame_control;
87 ADD_ONE_WITH_WRAP_AROUND(pCache->uInPtr, DUPLICATE_RX_CACHE_LENGTH);
93 * Found if sequence number of received fragment packet in Defragment Database
97 * pDevice - Pointer to adapter
98 * pMACHeader - 802.11 MAC Header of received packet
102 * Return Value: index number in Defragment Database
106 unsigned int WCTLuSearchDFCB(struct vnt_private *pDevice,
107 struct ieee80211_hdr *pMACHeader)
111 for (ii = 0; ii < pDevice->cbDFCB; ii++) {
112 if ((pDevice->sRxDFCB[ii].bInUse == true) &&
113 (!compare_ether_addr(&(pDevice->sRxDFCB[ii].abyAddr2[0]),
114 &(pMACHeader->addr2[0])))) {
118 return pDevice->cbDFCB;
123 * Insert received fragment packet in Defragment Database
127 * pDevice - Pointer to adapter
128 * pMACHeader - 802.11 MAC Header of received packet
132 * Return Value: index number in Defragment Database
135 unsigned int WCTLuInsertDFCB(struct vnt_private *pDevice,
136 struct ieee80211_hdr *pMACHeader)
140 if (pDevice->cbFreeDFCB == 0)
141 return(pDevice->cbDFCB);
142 for (ii = 0; ii < pDevice->cbDFCB; ii++) {
143 if (pDevice->sRxDFCB[ii].bInUse == false) {
144 pDevice->cbFreeDFCB--;
145 pDevice->sRxDFCB[ii].uLifetime = pDevice->dwMaxReceiveLifetime;
146 pDevice->sRxDFCB[ii].bInUse = true;
147 pDevice->sRxDFCB[ii].wSequence = (pMACHeader->seq_ctrl >> 4);
148 pDevice->sRxDFCB[ii].wFragNum = (pMACHeader->seq_ctrl & 0x000F);
149 memcpy(&(pDevice->sRxDFCB[ii].abyAddr2[0]),
150 &(pMACHeader->addr2[0]),
155 return(pDevice->cbDFCB);
160 * Handle received fragment packet
164 * pDevice - Pointer to adapter
165 * pMACHeader - 802.11 MAC Header of received packet
166 * cbFrameLength - Frame length
167 * bWEP - is WEP packet
171 * Return Value: true if it is valid fragment packet and we have resource to defragment; otherwise false
174 bool WCTLbHandleFragment(struct vnt_private *pDevice, struct ieee80211_hdr *pMACHeader, unsigned int cbFrameLength, bool bWEP, bool bExtIV)
176 unsigned int uHeaderSize;
188 if (IS_FIRST_FRAGMENT_PKT(pMACHeader)) {
189 pDevice->uCurrentDFCBIdx = WCTLuSearchDFCB(pDevice, pMACHeader);
190 if (pDevice->uCurrentDFCBIdx < pDevice->cbDFCB) {
191 // duplicate, we must flush previous DCB
192 pDevice->sRxDFCB[pDevice->uCurrentDFCBIdx].uLifetime = pDevice->dwMaxReceiveLifetime;
193 pDevice->sRxDFCB[pDevice->uCurrentDFCBIdx].wSequence = (pMACHeader->seq_ctrl >> 4);
194 pDevice->sRxDFCB[pDevice->uCurrentDFCBIdx].wFragNum = (pMACHeader->seq_ctrl & 0x000F);
197 pDevice->uCurrentDFCBIdx = WCTLuInsertDFCB(pDevice, pMACHeader);
198 if (pDevice->uCurrentDFCBIdx == pDevice->cbDFCB) {
202 // reserve 8 byte to match MAC RX Buffer
203 pDevice->sRxDFCB[pDevice->uCurrentDFCBIdx].pbyRxBuffer = (u8 *) (pDevice->sRxDFCB[pDevice->uCurrentDFCBIdx].skb->data + 8);
204 // pDevice->sRxDFCB[pDevice->uCurrentDFCBIdx].pbyRxBuffer = (u8 *) (pDevice->sRxDFCB[pDevice->uCurrentDFCBIdx].skb->data + 4);
205 memcpy(pDevice->sRxDFCB[pDevice->uCurrentDFCBIdx].pbyRxBuffer, pMACHeader, cbFrameLength);
206 pDevice->sRxDFCB[pDevice->uCurrentDFCBIdx].cbFrameLength = cbFrameLength;
207 pDevice->sRxDFCB[pDevice->uCurrentDFCBIdx].pbyRxBuffer += cbFrameLength;
208 pDevice->sRxDFCB[pDevice->uCurrentDFCBIdx].wFragNum++;
209 //DBG_PRT(MSG_LEVEL_DEBUG, KERN_INFO "First pDevice->uCurrentDFCBIdx= %d\n", pDevice->uCurrentDFCBIdx);
213 pDevice->uCurrentDFCBIdx = WCTLuSearchDFCB(pDevice, pMACHeader);
214 if (pDevice->uCurrentDFCBIdx != pDevice->cbDFCB) {
215 if ((pDevice->sRxDFCB[pDevice->uCurrentDFCBIdx].wSequence == (pMACHeader->seq_ctrl >> 4)) &&
216 (pDevice->sRxDFCB[pDevice->uCurrentDFCBIdx].wFragNum == (pMACHeader->seq_ctrl & 0x000F)) &&
217 ((pDevice->sRxDFCB[pDevice->uCurrentDFCBIdx].cbFrameLength + cbFrameLength - uHeaderSize) < 2346)) {
219 memcpy(pDevice->sRxDFCB[pDevice->uCurrentDFCBIdx].pbyRxBuffer, ((u8 *) (pMACHeader) + uHeaderSize), (cbFrameLength - uHeaderSize));
220 pDevice->sRxDFCB[pDevice->uCurrentDFCBIdx].cbFrameLength += (cbFrameLength - uHeaderSize);
221 pDevice->sRxDFCB[pDevice->uCurrentDFCBIdx].pbyRxBuffer += (cbFrameLength - uHeaderSize);
222 pDevice->sRxDFCB[pDevice->uCurrentDFCBIdx].wFragNum++;
223 //DBG_PRT(MSG_LEVEL_DEBUG, KERN_INFO "Second pDevice->uCurrentDFCBIdx= %d\n", pDevice->uCurrentDFCBIdx);
226 // seq error or frag # error flush DFCB
227 pDevice->cbFreeDFCB++;
228 pDevice->sRxDFCB[pDevice->uCurrentDFCBIdx].bInUse = false;
235 if (IS_LAST_FRAGMENT_PKT(pMACHeader)) {
236 //enq defragcontrolblock
237 pDevice->cbFreeDFCB++;
238 pDevice->sRxDFCB[pDevice->uCurrentDFCBIdx].bInUse = false;
239 //DBG_PRT(MSG_LEVEL_DEBUG, KERN_INFO "Last pDevice->uCurrentDFCBIdx= %d\n", pDevice->uCurrentDFCBIdx);