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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 | ||
92b96797 | 37 | #include "wctl.h" |
92b96797 | 38 | #include "device.h" |
92b96797 | 39 | #include "card.h" |
92b96797 | 40 | #include "tmacro.h" |
92b96797 FB |
41 | |
42 | /*--------------------- Static Definitions -------------------------*/ | |
43 | ||
44 | /*--------------------- Static Classes ----------------------------*/ | |
45 | ||
46 | /*--------------------- Static Variables --------------------------*/ | |
47 | // static int msglevel =MSG_LEVEL_INFO; | |
48 | /*--------------------- Static Functions --------------------------*/ | |
49 | ||
50 | /*--------------------- Export Variables --------------------------*/ | |
51 | ||
52 | ||
53 | ||
54 | /* | |
55 | * Description: | |
56 | * Scan Rx cache. Return TRUE if packet is duplicate, else | |
57 | * inserts in receive cache and returns FALSE. | |
58 | * | |
59 | * Parameters: | |
60 | * In: | |
61 | * pCache - Receive packets history | |
62 | * pMACHeader - 802.11 MAC Header of received packet | |
63 | * Out: | |
64 | * none | |
65 | * | |
66 | * Return Value: TRUE if packet duplicate; otherwise FALSE | |
67 | * | |
68 | */ | |
69 | ||
70 | BOOL WCTLbIsDuplicate (PSCache pCache, PS802_11Header pMACHeader) | |
71 | { | |
cc856e61 AM |
72 | unsigned int uIndex; |
73 | unsigned int ii; | |
92b96797 FB |
74 | PSCacheEntry pCacheEntry; |
75 | ||
76 | if (IS_FC_RETRY(pMACHeader)) { | |
77 | ||
78 | uIndex = pCache->uInPtr; | |
79 | for (ii = 0; ii < DUPLICATE_RX_CACHE_LENGTH; ii++) { | |
80 | pCacheEntry = &(pCache->asCacheEntry[uIndex]); | |
81 | if ((pCacheEntry->wFmSequence == pMACHeader->wSeqCtl) && | |
82 | (IS_ETH_ADDRESS_EQUAL (&(pCacheEntry->abyAddr2[0]), &(pMACHeader->abyAddr2[0]))) && | |
83 | (LOBYTE(pCacheEntry->wFrameCtl) == LOBYTE(pMACHeader->wFrameCtl)) | |
84 | ) { | |
85 | /* Duplicate match */ | |
86 | return TRUE; | |
87 | } | |
88 | ADD_ONE_WITH_WRAP_AROUND(uIndex, DUPLICATE_RX_CACHE_LENGTH); | |
89 | } | |
90 | } | |
91 | /* Not fount in cache - insert */ | |
92 | pCacheEntry = &pCache->asCacheEntry[pCache->uInPtr]; | |
93 | pCacheEntry->wFmSequence = pMACHeader->wSeqCtl; | |
9a0e756c | 94 | memcpy(&(pCacheEntry->abyAddr2[0]), &(pMACHeader->abyAddr2[0]), ETH_ALEN); |
92b96797 FB |
95 | pCacheEntry->wFrameCtl = pMACHeader->wFrameCtl; |
96 | ADD_ONE_WITH_WRAP_AROUND(pCache->uInPtr, DUPLICATE_RX_CACHE_LENGTH); | |
97 | return FALSE; | |
98 | } | |
99 | ||
100 | /* | |
101 | * Description: | |
102 | * Found if sequence number of received fragment packet in Defragment Database | |
103 | * | |
104 | * Parameters: | |
105 | * In: | |
106 | * pDevice - Pointer to adapter | |
107 | * pMACHeader - 802.11 MAC Header of received packet | |
108 | * Out: | |
109 | * none | |
110 | * | |
111 | * Return Value: index number in Defragment Database | |
112 | * | |
113 | */ | |
cc856e61 | 114 | unsigned int WCTLuSearchDFCB(PSDevice pDevice, PS802_11Header pMACHeader) |
92b96797 | 115 | { |
cc856e61 | 116 | unsigned int ii; |
92b96797 FB |
117 | |
118 | for(ii=0;ii<pDevice->cbDFCB;ii++) { | |
119 | if ((pDevice->sRxDFCB[ii].bInUse == TRUE) && | |
120 | (IS_ETH_ADDRESS_EQUAL (&(pDevice->sRxDFCB[ii].abyAddr2[0]), &(pMACHeader->abyAddr2[0]))) | |
121 | ) { | |
122 | // | |
123 | return(ii); | |
124 | } | |
125 | } | |
126 | return(pDevice->cbDFCB); | |
127 | } | |
128 | ||
129 | ||
130 | /* | |
131 | * Description: | |
132 | * Insert received fragment packet in Defragment Database | |
133 | * | |
134 | * Parameters: | |
135 | * In: | |
136 | * pDevice - Pointer to adapter | |
137 | * pMACHeader - 802.11 MAC Header of received packet | |
138 | * Out: | |
139 | * none | |
140 | * | |
141 | * Return Value: index number in Defragment Database | |
142 | * | |
143 | */ | |
cc856e61 | 144 | unsigned int WCTLuInsertDFCB(PSDevice pDevice, PS802_11Header pMACHeader) |
92b96797 | 145 | { |
cc856e61 | 146 | unsigned int ii; |
92b96797 FB |
147 | |
148 | if (pDevice->cbFreeDFCB == 0) | |
149 | return(pDevice->cbDFCB); | |
150 | for(ii=0;ii<pDevice->cbDFCB;ii++) { | |
151 | if (pDevice->sRxDFCB[ii].bInUse == FALSE) { | |
152 | pDevice->cbFreeDFCB--; | |
153 | pDevice->sRxDFCB[ii].uLifetime = pDevice->dwMaxReceiveLifetime; | |
154 | pDevice->sRxDFCB[ii].bInUse = TRUE; | |
155 | pDevice->sRxDFCB[ii].wSequence = (pMACHeader->wSeqCtl >> 4); | |
156 | pDevice->sRxDFCB[ii].wFragNum = (pMACHeader->wSeqCtl & 0x000F); | |
9a0e756c AM |
157 | memcpy(&(pDevice->sRxDFCB[ii].abyAddr2[0]), |
158 | &(pMACHeader->abyAddr2[0]), | |
159 | ETH_ALEN); | |
92b96797 FB |
160 | return(ii); |
161 | } | |
162 | } | |
163 | return(pDevice->cbDFCB); | |
164 | } | |
165 | ||
166 | ||
167 | /* | |
168 | * Description: | |
169 | * Handle received fragment packet | |
170 | * | |
171 | * Parameters: | |
172 | * In: | |
173 | * pDevice - Pointer to adapter | |
174 | * pMACHeader - 802.11 MAC Header of received packet | |
175 | * cbFrameLength - Frame length | |
176 | * bWEP - is WEP packet | |
177 | * Out: | |
178 | * none | |
179 | * | |
180 | * Return Value: TRUE if it is valid fragment packet and we have resource to defragment; otherwise FALSE | |
181 | * | |
182 | */ | |
cc856e61 AM |
183 | BOOL WCTLbHandleFragment(PSDevice pDevice, PS802_11Header pMACHeader, |
184 | unsigned int cbFrameLength, BOOL bWEP, BOOL bExtIV) | |
92b96797 | 185 | { |
cc856e61 | 186 | unsigned int uHeaderSize; |
92b96797 FB |
187 | |
188 | ||
189 | if (bWEP == TRUE) { | |
190 | uHeaderSize = 28; | |
191 | if (bExtIV) | |
192 | // ExtIV | |
193 | uHeaderSize +=4; | |
194 | } | |
195 | else { | |
196 | uHeaderSize = 24; | |
197 | } | |
198 | ||
199 | if (IS_FIRST_FRAGMENT_PKT(pMACHeader)) { | |
200 | pDevice->uCurrentDFCBIdx = WCTLuSearchDFCB(pDevice, pMACHeader); | |
201 | if (pDevice->uCurrentDFCBIdx < pDevice->cbDFCB) { | |
202 | // duplicate, we must flush previous DCB | |
203 | pDevice->sRxDFCB[pDevice->uCurrentDFCBIdx].uLifetime = pDevice->dwMaxReceiveLifetime; | |
204 | pDevice->sRxDFCB[pDevice->uCurrentDFCBIdx].wSequence = (pMACHeader->wSeqCtl >> 4); | |
205 | pDevice->sRxDFCB[pDevice->uCurrentDFCBIdx].wFragNum = (pMACHeader->wSeqCtl & 0x000F); | |
206 | } | |
207 | else { | |
208 | pDevice->uCurrentDFCBIdx = WCTLuInsertDFCB(pDevice, pMACHeader); | |
209 | if (pDevice->uCurrentDFCBIdx == pDevice->cbDFCB) { | |
210 | return(FALSE); | |
211 | } | |
212 | } | |
213 | // reserve 8 byte to match MAC RX Buffer | |
214 | pDevice->sRxDFCB[pDevice->uCurrentDFCBIdx].pbyRxBuffer = (PBYTE) (pDevice->sRxDFCB[pDevice->uCurrentDFCBIdx].skb->data + 8); | |
215 | // pDevice->sRxDFCB[pDevice->uCurrentDFCBIdx].pbyRxBuffer = (PBYTE) (pDevice->sRxDFCB[pDevice->uCurrentDFCBIdx].skb->data + 4); | |
216 | memcpy(pDevice->sRxDFCB[pDevice->uCurrentDFCBIdx].pbyRxBuffer, pMACHeader, cbFrameLength); | |
217 | pDevice->sRxDFCB[pDevice->uCurrentDFCBIdx].cbFrameLength = cbFrameLength; | |
218 | pDevice->sRxDFCB[pDevice->uCurrentDFCBIdx].pbyRxBuffer += cbFrameLength; | |
219 | pDevice->sRxDFCB[pDevice->uCurrentDFCBIdx].wFragNum++; | |
220 | //DBG_PRT(MSG_LEVEL_DEBUG, KERN_INFO "First pDevice->uCurrentDFCBIdx= %d\n", pDevice->uCurrentDFCBIdx); | |
221 | return(FALSE); | |
222 | } | |
223 | else { | |
224 | pDevice->uCurrentDFCBIdx = WCTLuSearchDFCB(pDevice, pMACHeader); | |
225 | if (pDevice->uCurrentDFCBIdx != pDevice->cbDFCB) { | |
226 | if ((pDevice->sRxDFCB[pDevice->uCurrentDFCBIdx].wSequence == (pMACHeader->wSeqCtl >> 4)) && | |
227 | (pDevice->sRxDFCB[pDevice->uCurrentDFCBIdx].wFragNum == (pMACHeader->wSeqCtl & 0x000F)) && | |
228 | ((pDevice->sRxDFCB[pDevice->uCurrentDFCBIdx].cbFrameLength + cbFrameLength - uHeaderSize) < 2346)) { | |
229 | ||
230 | memcpy(pDevice->sRxDFCB[pDevice->uCurrentDFCBIdx].pbyRxBuffer, ((PBYTE) (pMACHeader) + uHeaderSize), (cbFrameLength - uHeaderSize)); | |
231 | pDevice->sRxDFCB[pDevice->uCurrentDFCBIdx].cbFrameLength += (cbFrameLength - uHeaderSize); | |
232 | pDevice->sRxDFCB[pDevice->uCurrentDFCBIdx].pbyRxBuffer += (cbFrameLength - uHeaderSize); | |
233 | pDevice->sRxDFCB[pDevice->uCurrentDFCBIdx].wFragNum++; | |
234 | //DBG_PRT(MSG_LEVEL_DEBUG, KERN_INFO "Second pDevice->uCurrentDFCBIdx= %d\n", pDevice->uCurrentDFCBIdx); | |
235 | } | |
236 | else { | |
237 | // seq error or frag # error flush DFCB | |
238 | pDevice->cbFreeDFCB++; | |
239 | pDevice->sRxDFCB[pDevice->uCurrentDFCBIdx].bInUse = FALSE; | |
240 | return(FALSE); | |
241 | } | |
242 | } | |
243 | else { | |
244 | return(FALSE); | |
245 | } | |
246 | if (IS_LAST_FRAGMENT_PKT(pMACHeader)) { | |
247 | //enq defragcontrolblock | |
248 | pDevice->cbFreeDFCB++; | |
249 | pDevice->sRxDFCB[pDevice->uCurrentDFCBIdx].bInUse = FALSE; | |
250 | //DBG_PRT(MSG_LEVEL_DEBUG, KERN_INFO "Last pDevice->uCurrentDFCBIdx= %d\n", pDevice->uCurrentDFCBIdx); | |
251 | return(TRUE); | |
252 | } | |
253 | return(FALSE); | |
254 | } | |
255 | } | |
256 | ||
257 |