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
41 /*--------------------- Static Definitions -------------------------*/
43 /*--------------------- Static Classes ----------------------------*/
45 /*--------------------- Static Variables --------------------------*/
46 // static int msglevel =MSG_LEVEL_INFO;
47 /*--------------------- Static Functions --------------------------*/
49 /*--------------------- Export Variables --------------------------*/
53 * Scan Rx cache. Return true if packet is duplicate, else
54 * inserts in receive cache and returns false.
58 * pCache - Receive packets history
59 * pMACHeader - 802.11 MAC Header of received packet
63 * Return Value: true if packet duplicate; otherwise false
67 bool WCTLbIsDuplicate(PSCache pCache
, PS802_11Header pMACHeader
)
71 PSCacheEntry pCacheEntry
;
73 if (IS_FC_RETRY(pMACHeader
)) {
74 uIndex
= pCache
->uInPtr
;
75 for (ii
= 0; ii
< DUPLICATE_RX_CACHE_LENGTH
; ii
++) {
76 pCacheEntry
= &(pCache
->asCacheEntry
[uIndex
]);
77 if ((pCacheEntry
->wFmSequence
== pMACHeader
->wSeqCtl
) &&
78 (!compare_ether_addr(&(pCacheEntry
->abyAddr2
[0]), &(pMACHeader
->abyAddr2
[0])))
83 ADD_ONE_WITH_WRAP_AROUND(uIndex
, DUPLICATE_RX_CACHE_LENGTH
);
86 /* Not fount in cache - insert */
87 pCacheEntry
= &pCache
->asCacheEntry
[pCache
->uInPtr
];
88 pCacheEntry
->wFmSequence
= pMACHeader
->wSeqCtl
;
89 memcpy(&(pCacheEntry
->abyAddr2
[0]), &(pMACHeader
->abyAddr2
[0]), ETH_ALEN
);
90 ADD_ONE_WITH_WRAP_AROUND(pCache
->uInPtr
, DUPLICATE_RX_CACHE_LENGTH
);
96 * Found if sequence number of received fragment packet in Defragment Database
100 * pDevice - Pointer to adapter
101 * pMACHeader - 802.11 MAC Header of received packet
105 * Return Value: index number in Defragment Database
108 unsigned int WCTLuSearchDFCB(PSDevice pDevice
, PS802_11Header pMACHeader
)
112 for (ii
= 0; ii
< pDevice
->cbDFCB
; ii
++) {
113 if ((pDevice
->sRxDFCB
[ii
].bInUse
== true) &&
114 (!compare_ether_addr(&(pDevice
->sRxDFCB
[ii
].abyAddr2
[0]), &(pMACHeader
->abyAddr2
[0])))
120 return pDevice
->cbDFCB
;
125 * Insert received fragment packet in Defragment Database
129 * pDevice - Pointer to adapter
130 * pMACHeader - 802.11 MAC Header of received packet
134 * Return Value: index number in Defragment Database
137 unsigned int WCTLuInsertDFCB(PSDevice pDevice
, PS802_11Header pMACHeader
)
141 if (pDevice
->cbFreeDFCB
== 0)
142 return pDevice
->cbDFCB
;
143 for (ii
= 0; ii
< pDevice
->cbDFCB
; ii
++) {
144 if (pDevice
->sRxDFCB
[ii
].bInUse
== false) {
145 pDevice
->cbFreeDFCB
--;
146 pDevice
->sRxDFCB
[ii
].uLifetime
= pDevice
->dwMaxReceiveLifetime
;
147 pDevice
->sRxDFCB
[ii
].bInUse
= true;
148 pDevice
->sRxDFCB
[ii
].wSequence
= (pMACHeader
->wSeqCtl
>> 4);
149 pDevice
->sRxDFCB
[ii
].wFragNum
= (pMACHeader
->wSeqCtl
& 0x000F);
150 memcpy(&(pDevice
->sRxDFCB
[ii
].abyAddr2
[0]), &(pMACHeader
->abyAddr2
[0]), ETH_ALEN
);
154 return pDevice
->cbDFCB
;
159 * Handle received fragment packet
163 * pDevice - Pointer to adapter
164 * pMACHeader - 802.11 MAC Header of received packet
165 * cbFrameLength - Frame length
166 * bWEP - is WEP packet
170 * Return Value: true if it is valid fragment packet and we have resource to defragment; otherwise false
173 bool WCTLbHandleFragment(PSDevice pDevice
, PS802_11Header pMACHeader
, unsigned int cbFrameLength
, bool bWEP
, bool bExtIV
)
175 unsigned int uHeaderSize
;
186 if (IS_FIRST_FRAGMENT_PKT(pMACHeader
)) {
187 pDevice
->uCurrentDFCBIdx
= WCTLuSearchDFCB(pDevice
, pMACHeader
);
188 if (pDevice
->uCurrentDFCBIdx
< pDevice
->cbDFCB
) {
189 // duplicate, we must flush previous DCB
190 pDevice
->sRxDFCB
[pDevice
->uCurrentDFCBIdx
].uLifetime
= pDevice
->dwMaxReceiveLifetime
;
191 pDevice
->sRxDFCB
[pDevice
->uCurrentDFCBIdx
].wSequence
= (pMACHeader
->wSeqCtl
>> 4);
192 pDevice
->sRxDFCB
[pDevice
->uCurrentDFCBIdx
].wFragNum
= (pMACHeader
->wSeqCtl
& 0x000F);
194 pDevice
->uCurrentDFCBIdx
= WCTLuInsertDFCB(pDevice
, pMACHeader
);
195 if (pDevice
->uCurrentDFCBIdx
== pDevice
->cbDFCB
) {
199 // reserve 4 byte to match MAC RX Buffer
200 pDevice
->sRxDFCB
[pDevice
->uCurrentDFCBIdx
].pbyRxBuffer
= (unsigned char *)(pDevice
->sRxDFCB
[pDevice
->uCurrentDFCBIdx
].skb
->data
+ 4);
201 memcpy(pDevice
->sRxDFCB
[pDevice
->uCurrentDFCBIdx
].pbyRxBuffer
, pMACHeader
, cbFrameLength
);
202 pDevice
->sRxDFCB
[pDevice
->uCurrentDFCBIdx
].cbFrameLength
= cbFrameLength
;
203 pDevice
->sRxDFCB
[pDevice
->uCurrentDFCBIdx
].pbyRxBuffer
+= cbFrameLength
;
204 pDevice
->sRxDFCB
[pDevice
->uCurrentDFCBIdx
].wFragNum
++;
205 //DBG_PRT(MSG_LEVEL_DEBUG, KERN_INFO "First pDevice->uCurrentDFCBIdx= %d\n", pDevice->uCurrentDFCBIdx);
208 pDevice
->uCurrentDFCBIdx
= WCTLuSearchDFCB(pDevice
, pMACHeader
);
209 if (pDevice
->uCurrentDFCBIdx
!= pDevice
->cbDFCB
) {
210 if ((pDevice
->sRxDFCB
[pDevice
->uCurrentDFCBIdx
].wSequence
== (pMACHeader
->wSeqCtl
>> 4)) &&
211 (pDevice
->sRxDFCB
[pDevice
->uCurrentDFCBIdx
].wFragNum
== (pMACHeader
->wSeqCtl
& 0x000F)) &&
212 ((pDevice
->sRxDFCB
[pDevice
->uCurrentDFCBIdx
].cbFrameLength
+ cbFrameLength
- uHeaderSize
) < 2346)) {
213 memcpy(pDevice
->sRxDFCB
[pDevice
->uCurrentDFCBIdx
].pbyRxBuffer
, ((unsigned char *)(pMACHeader
) + uHeaderSize
), (cbFrameLength
- uHeaderSize
));
214 pDevice
->sRxDFCB
[pDevice
->uCurrentDFCBIdx
].cbFrameLength
+= (cbFrameLength
- uHeaderSize
);
215 pDevice
->sRxDFCB
[pDevice
->uCurrentDFCBIdx
].pbyRxBuffer
+= (cbFrameLength
- uHeaderSize
);
216 pDevice
->sRxDFCB
[pDevice
->uCurrentDFCBIdx
].wFragNum
++;
217 //DBG_PRT(MSG_LEVEL_DEBUG, KERN_INFO "Second pDevice->uCurrentDFCBIdx= %d\n", pDevice->uCurrentDFCBIdx);
219 // seq error or frag # error flush DFCB
220 pDevice
->cbFreeDFCB
++;
221 pDevice
->sRxDFCB
[pDevice
->uCurrentDFCBIdx
].bInUse
= false;
227 if (IS_LAST_FRAGMENT_PKT(pMACHeader
)) {
228 //enq defragcontrolblock
229 pDevice
->cbFreeDFCB
++;
230 pDevice
->sRxDFCB
[pDevice
->uCurrentDFCBIdx
].bInUse
= false;
231 //DBG_PRT(MSG_LEVEL_DEBUG, KERN_INFO "Last pDevice->uCurrentDFCBIdx= %d\n", pDevice->uCurrentDFCBIdx);