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1 | /* |
2 | * Copyright (c) 1996, 2003 VIA Networking Technologies, Inc. | |
3 | * All rights reserved. | |
4 | * | |
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. | |
9 | * | |
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. | |
14 | * | |
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. | |
18 | * | |
19 | * File: wctl.c | |
20 | * | |
21 | * Purpose: handle WMAC duplicate filter & defragment | |
22 | * | |
23 | * Author: Jerry Chen | |
24 | * | |
25 | * Date: Jun. 27, 2002 | |
26 | * | |
27 | * Functions: | |
28 | * WCTLbIsDuplicate - Test if duplicate packet | |
29 | * WCTLuSearchDFCB - Search DeFragment Control Database | |
30 | * WCTLuInsertDFCB - Insert DeFragment Control Database | |
31 | * WCTLbHandleFragment - Handle received fragment packet | |
32 | * | |
33 | * Revision History: | |
34 | * | |
35 | */ | |
36 | ||
5449c685 | 37 | #include "wctl.h" |
5449c685 | 38 | #include "device.h" |
5449c685 | 39 | #include "card.h" |
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40 | |
41 | /*--------------------- Static Definitions -------------------------*/ | |
42 | ||
43 | /*--------------------- Static Classes ----------------------------*/ | |
44 | ||
45 | /*--------------------- Static Variables --------------------------*/ | |
46 | // static int msglevel =MSG_LEVEL_INFO; | |
47 | /*--------------------- Static Functions --------------------------*/ | |
48 | ||
49 | /*--------------------- Export Variables --------------------------*/ | |
50 | ||
51 | ||
52 | ||
53 | /* | |
54 | * Description: | |
55 | * Scan Rx cache. Return TRUE if packet is duplicate, else | |
56 | * inserts in receive cache and returns FALSE. | |
57 | * | |
58 | * Parameters: | |
59 | * In: | |
60 | * pCache - Receive packets history | |
61 | * pMACHeader - 802.11 MAC Header of received packet | |
62 | * Out: | |
63 | * none | |
64 | * | |
65 | * Return Value: TRUE if packet duplicate; otherwise FALSE | |
66 | * | |
67 | */ | |
68 | ||
69 | BOOL WCTLbIsDuplicate (PSCache pCache, PS802_11Header pMACHeader) | |
70 | { | |
71 | UINT uIndex; | |
72 | UINT ii; | |
73 | PSCacheEntry pCacheEntry; | |
74 | ||
75 | if (IS_FC_RETRY(pMACHeader)) { | |
76 | ||
77 | uIndex = pCache->uInPtr; | |
78 | for (ii = 0; ii < DUPLICATE_RX_CACHE_LENGTH; ii++) { | |
79 | pCacheEntry = &(pCache->asCacheEntry[uIndex]); | |
80 | if ((pCacheEntry->wFmSequence == pMACHeader->wSeqCtl) && | |
81 | (IS_ETH_ADDRESS_EQUAL (&(pCacheEntry->abyAddr2[0]), &(pMACHeader->abyAddr2[0]))) | |
82 | ) { | |
83 | /* Duplicate match */ | |
84 | return TRUE; | |
85 | } | |
86 | ADD_ONE_WITH_WRAP_AROUND(uIndex, DUPLICATE_RX_CACHE_LENGTH); | |
87 | } | |
88 | } | |
89 | /* Not fount in cache - insert */ | |
90 | pCacheEntry = &pCache->asCacheEntry[pCache->uInPtr]; | |
91 | pCacheEntry->wFmSequence = pMACHeader->wSeqCtl; | |
078b078f | 92 | memcpy(&(pCacheEntry->abyAddr2[0]), &(pMACHeader->abyAddr2[0]), ETH_ALEN); |
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93 | ADD_ONE_WITH_WRAP_AROUND(pCache->uInPtr, DUPLICATE_RX_CACHE_LENGTH); |
94 | return FALSE; | |
95 | } | |
96 | ||
97 | /* | |
98 | * Description: | |
99 | * Found if sequence number of received fragment packet in Defragment Database | |
100 | * | |
101 | * Parameters: | |
102 | * In: | |
103 | * pDevice - Pointer to adapter | |
104 | * pMACHeader - 802.11 MAC Header of received packet | |
105 | * Out: | |
106 | * none | |
107 | * | |
108 | * Return Value: index number in Defragment Database | |
109 | * | |
110 | */ | |
111 | UINT WCTLuSearchDFCB (PSDevice pDevice, PS802_11Header pMACHeader) | |
112 | { | |
113 | UINT ii; | |
114 | ||
115 | for(ii=0;ii<pDevice->cbDFCB;ii++) { | |
116 | if ((pDevice->sRxDFCB[ii].bInUse == TRUE) && | |
117 | (IS_ETH_ADDRESS_EQUAL (&(pDevice->sRxDFCB[ii].abyAddr2[0]), &(pMACHeader->abyAddr2[0]))) | |
118 | ) { | |
119 | // | |
120 | return(ii); | |
121 | } | |
122 | } | |
123 | return(pDevice->cbDFCB); | |
124 | } | |
125 | ||
126 | ||
127 | /* | |
128 | * Description: | |
129 | * Insert received fragment packet in Defragment Database | |
130 | * | |
131 | * Parameters: | |
132 | * In: | |
133 | * pDevice - Pointer to adapter | |
134 | * pMACHeader - 802.11 MAC Header of received packet | |
135 | * Out: | |
136 | * none | |
137 | * | |
138 | * Return Value: index number in Defragment Database | |
139 | * | |
140 | */ | |
141 | UINT WCTLuInsertDFCB (PSDevice pDevice, PS802_11Header pMACHeader) | |
142 | { | |
143 | UINT ii; | |
144 | ||
145 | if (pDevice->cbFreeDFCB == 0) | |
146 | return(pDevice->cbDFCB); | |
147 | for(ii=0;ii<pDevice->cbDFCB;ii++) { | |
148 | if (pDevice->sRxDFCB[ii].bInUse == FALSE) { | |
149 | pDevice->cbFreeDFCB--; | |
150 | pDevice->sRxDFCB[ii].uLifetime = pDevice->dwMaxReceiveLifetime; | |
151 | pDevice->sRxDFCB[ii].bInUse = TRUE; | |
152 | pDevice->sRxDFCB[ii].wSequence = (pMACHeader->wSeqCtl >> 4); | |
153 | pDevice->sRxDFCB[ii].wFragNum = (pMACHeader->wSeqCtl & 0x000F); | |
078b078f | 154 | memcpy(&(pDevice->sRxDFCB[ii].abyAddr2[0]), &(pMACHeader->abyAddr2[0]), ETH_ALEN); |
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155 | return(ii); |
156 | } | |
157 | } | |
158 | return(pDevice->cbDFCB); | |
159 | } | |
160 | ||
161 | ||
162 | /* | |
163 | * Description: | |
164 | * Handle received fragment packet | |
165 | * | |
166 | * Parameters: | |
167 | * In: | |
168 | * pDevice - Pointer to adapter | |
169 | * pMACHeader - 802.11 MAC Header of received packet | |
170 | * cbFrameLength - Frame length | |
171 | * bWEP - is WEP packet | |
172 | * Out: | |
173 | * none | |
174 | * | |
175 | * Return Value: TRUE if it is valid fragment packet and we have resource to defragment; otherwise FALSE | |
176 | * | |
177 | */ | |
178 | BOOL WCTLbHandleFragment (PSDevice pDevice, PS802_11Header pMACHeader, UINT cbFrameLength, BOOL bWEP, BOOL bExtIV) | |
179 | { | |
180 | UINT uHeaderSize; | |
181 | ||
182 | ||
183 | if (bWEP == TRUE) { | |
184 | uHeaderSize = 28; | |
185 | if (bExtIV) | |
186 | // ExtIV | |
187 | uHeaderSize +=4; | |
188 | } | |
189 | else { | |
190 | uHeaderSize = 24; | |
191 | } | |
192 | ||
193 | if (IS_FIRST_FRAGMENT_PKT(pMACHeader)) { | |
194 | pDevice->uCurrentDFCBIdx = WCTLuSearchDFCB(pDevice, pMACHeader); | |
195 | if (pDevice->uCurrentDFCBIdx < pDevice->cbDFCB) { | |
196 | // duplicate, we must flush previous DCB | |
197 | pDevice->sRxDFCB[pDevice->uCurrentDFCBIdx].uLifetime = pDevice->dwMaxReceiveLifetime; | |
198 | pDevice->sRxDFCB[pDevice->uCurrentDFCBIdx].wSequence = (pMACHeader->wSeqCtl >> 4); | |
199 | pDevice->sRxDFCB[pDevice->uCurrentDFCBIdx].wFragNum = (pMACHeader->wSeqCtl & 0x000F); | |
200 | } | |
201 | else { | |
202 | pDevice->uCurrentDFCBIdx = WCTLuInsertDFCB(pDevice, pMACHeader); | |
203 | if (pDevice->uCurrentDFCBIdx == pDevice->cbDFCB) { | |
204 | return(FALSE); | |
205 | } | |
206 | } | |
207 | // reserve 4 byte to match MAC RX Buffer | |
5449c685 | 208 | pDevice->sRxDFCB[pDevice->uCurrentDFCBIdx].pbyRxBuffer = (PBYTE) (pDevice->sRxDFCB[pDevice->uCurrentDFCBIdx].skb->data + 4); |
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209 | memcpy(pDevice->sRxDFCB[pDevice->uCurrentDFCBIdx].pbyRxBuffer, pMACHeader, cbFrameLength); |
210 | pDevice->sRxDFCB[pDevice->uCurrentDFCBIdx].cbFrameLength = cbFrameLength; | |
211 | pDevice->sRxDFCB[pDevice->uCurrentDFCBIdx].pbyRxBuffer += cbFrameLength; | |
212 | pDevice->sRxDFCB[pDevice->uCurrentDFCBIdx].wFragNum++; | |
7e809a9b | 213 | //DBG_PRT(MSG_LEVEL_DEBUG, KERN_INFO "First pDevice->uCurrentDFCBIdx= %d\n", pDevice->uCurrentDFCBIdx); |
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214 | return(FALSE); |
215 | } | |
216 | else { | |
217 | pDevice->uCurrentDFCBIdx = WCTLuSearchDFCB(pDevice, pMACHeader); | |
218 | if (pDevice->uCurrentDFCBIdx != pDevice->cbDFCB) { | |
219 | if ((pDevice->sRxDFCB[pDevice->uCurrentDFCBIdx].wSequence == (pMACHeader->wSeqCtl >> 4)) && | |
220 | (pDevice->sRxDFCB[pDevice->uCurrentDFCBIdx].wFragNum == (pMACHeader->wSeqCtl & 0x000F)) && | |
221 | ((pDevice->sRxDFCB[pDevice->uCurrentDFCBIdx].cbFrameLength + cbFrameLength - uHeaderSize) < 2346)) { | |
222 | ||
223 | memcpy(pDevice->sRxDFCB[pDevice->uCurrentDFCBIdx].pbyRxBuffer, ((PBYTE) (pMACHeader) + uHeaderSize), (cbFrameLength - uHeaderSize)); | |
224 | pDevice->sRxDFCB[pDevice->uCurrentDFCBIdx].cbFrameLength += (cbFrameLength - uHeaderSize); | |
225 | pDevice->sRxDFCB[pDevice->uCurrentDFCBIdx].pbyRxBuffer += (cbFrameLength - uHeaderSize); | |
226 | pDevice->sRxDFCB[pDevice->uCurrentDFCBIdx].wFragNum++; | |
7e809a9b | 227 | //DBG_PRT(MSG_LEVEL_DEBUG, KERN_INFO "Second pDevice->uCurrentDFCBIdx= %d\n", pDevice->uCurrentDFCBIdx); |
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228 | } |
229 | else { | |
230 | // seq error or frag # error flush DFCB | |
231 | pDevice->cbFreeDFCB++; | |
232 | pDevice->sRxDFCB[pDevice->uCurrentDFCBIdx].bInUse = FALSE; | |
233 | return(FALSE); | |
234 | } | |
235 | } | |
236 | else { | |
237 | return(FALSE); | |
238 | } | |
239 | if (IS_LAST_FRAGMENT_PKT(pMACHeader)) { | |
240 | //enq defragcontrolblock | |
241 | pDevice->cbFreeDFCB++; | |
242 | pDevice->sRxDFCB[pDevice->uCurrentDFCBIdx].bInUse = FALSE; | |
7e809a9b | 243 | //DBG_PRT(MSG_LEVEL_DEBUG, KERN_INFO "Last pDevice->uCurrentDFCBIdx= %d\n", pDevice->uCurrentDFCBIdx); |
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244 | return(TRUE); |
245 | } | |
246 | return(FALSE); | |
247 | } | |
248 | } | |
249 | ||
250 |