Forest Bond | 92b9679 | 2009-06-13 07:38:31 -0400 | [diff] [blame] | 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 | |
Forest Bond | 92b9679 | 2009-06-13 07:38:31 -0400 | [diff] [blame] | 37 | #include "wctl.h" |
Forest Bond | 92b9679 | 2009-06-13 07:38:31 -0400 | [diff] [blame] | 38 | #include "device.h" |
Forest Bond | 92b9679 | 2009-06-13 07:38:31 -0400 | [diff] [blame] | 39 | #include "card.h" |
Forest Bond | 92b9679 | 2009-06-13 07:38:31 -0400 | [diff] [blame] | 40 | #include "tmacro.h" |
Forest Bond | 92b9679 | 2009-06-13 07:38:31 -0400 | [diff] [blame] | 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 | { |
Andres More | cc856e6 | 2010-05-17 21:34:01 -0300 | [diff] [blame] | 72 | unsigned int uIndex; |
| 73 | unsigned int ii; |
Forest Bond | 92b9679 | 2009-06-13 07:38:31 -0400 | [diff] [blame] | 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) && |
Andres More | 4722a26 | 2010-06-23 20:38:10 -0300 | [diff] [blame] | 82 | (!compare_ether_addr(&(pCacheEntry->abyAddr2[0]), |
| 83 | &(pMACHeader->abyAddr2[0]))) && |
Forest Bond | 92b9679 | 2009-06-13 07:38:31 -0400 | [diff] [blame] | 84 | (LOBYTE(pCacheEntry->wFrameCtl) == LOBYTE(pMACHeader->wFrameCtl)) |
| 85 | ) { |
| 86 | /* Duplicate match */ |
| 87 | return TRUE; |
| 88 | } |
| 89 | ADD_ONE_WITH_WRAP_AROUND(uIndex, DUPLICATE_RX_CACHE_LENGTH); |
| 90 | } |
| 91 | } |
| 92 | /* Not fount in cache - insert */ |
| 93 | pCacheEntry = &pCache->asCacheEntry[pCache->uInPtr]; |
| 94 | pCacheEntry->wFmSequence = pMACHeader->wSeqCtl; |
Andres More | 9a0e756 | 2010-04-13 21:54:48 -0300 | [diff] [blame] | 95 | memcpy(&(pCacheEntry->abyAddr2[0]), &(pMACHeader->abyAddr2[0]), ETH_ALEN); |
Forest Bond | 92b9679 | 2009-06-13 07:38:31 -0400 | [diff] [blame] | 96 | pCacheEntry->wFrameCtl = pMACHeader->wFrameCtl; |
| 97 | ADD_ONE_WITH_WRAP_AROUND(pCache->uInPtr, DUPLICATE_RX_CACHE_LENGTH); |
| 98 | return FALSE; |
| 99 | } |
| 100 | |
| 101 | /* |
| 102 | * Description: |
| 103 | * Found if sequence number of received fragment packet in Defragment Database |
| 104 | * |
| 105 | * Parameters: |
| 106 | * In: |
| 107 | * pDevice - Pointer to adapter |
| 108 | * pMACHeader - 802.11 MAC Header of received packet |
| 109 | * Out: |
| 110 | * none |
| 111 | * |
| 112 | * Return Value: index number in Defragment Database |
| 113 | * |
| 114 | */ |
Andres More | 33d33e42 | 2010-05-19 23:50:00 -0300 | [diff] [blame] | 115 | |
Andres More | cc856e6 | 2010-05-17 21:34:01 -0300 | [diff] [blame] | 116 | unsigned int WCTLuSearchDFCB(PSDevice pDevice, PS802_11Header pMACHeader) |
Forest Bond | 92b9679 | 2009-06-13 07:38:31 -0400 | [diff] [blame] | 117 | { |
Andres More | cc856e6 | 2010-05-17 21:34:01 -0300 | [diff] [blame] | 118 | unsigned int ii; |
Forest Bond | 92b9679 | 2009-06-13 07:38:31 -0400 | [diff] [blame] | 119 | |
Andres More | 33d33e42 | 2010-05-19 23:50:00 -0300 | [diff] [blame] | 120 | for (ii = 0; ii < pDevice->cbDFCB; ii++) { |
| 121 | if ((pDevice->sRxDFCB[ii].bInUse == TRUE) && |
Andres More | 4722a26 | 2010-06-23 20:38:10 -0300 | [diff] [blame] | 122 | (!compare_ether_addr(&(pDevice->sRxDFCB[ii].abyAddr2[0]), |
Andres More | 33d33e42 | 2010-05-19 23:50:00 -0300 | [diff] [blame] | 123 | &(pMACHeader->abyAddr2[0])))) { |
| 124 | return ii; |
| 125 | } |
| 126 | } |
| 127 | return pDevice->cbDFCB; |
Forest Bond | 92b9679 | 2009-06-13 07:38:31 -0400 | [diff] [blame] | 128 | } |
| 129 | |
Forest Bond | 92b9679 | 2009-06-13 07:38:31 -0400 | [diff] [blame] | 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 | */ |
Andres More | cc856e6 | 2010-05-17 21:34:01 -0300 | [diff] [blame] | 144 | unsigned int WCTLuInsertDFCB(PSDevice pDevice, PS802_11Header pMACHeader) |
Forest Bond | 92b9679 | 2009-06-13 07:38:31 -0400 | [diff] [blame] | 145 | { |
Andres More | cc856e6 | 2010-05-17 21:34:01 -0300 | [diff] [blame] | 146 | unsigned int ii; |
Forest Bond | 92b9679 | 2009-06-13 07:38:31 -0400 | [diff] [blame] | 147 | |
| 148 | if (pDevice->cbFreeDFCB == 0) |
| 149 | return(pDevice->cbDFCB); |
Andres More | 33d33e42 | 2010-05-19 23:50:00 -0300 | [diff] [blame] | 150 | for (ii = 0; ii < pDevice->cbDFCB; ii++) { |
Forest Bond | 92b9679 | 2009-06-13 07:38:31 -0400 | [diff] [blame] | 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); |
Andres More | 9a0e756 | 2010-04-13 21:54:48 -0300 | [diff] [blame] | 157 | memcpy(&(pDevice->sRxDFCB[ii].abyAddr2[0]), |
| 158 | &(pMACHeader->abyAddr2[0]), |
| 159 | ETH_ALEN); |
Forest Bond | 92b9679 | 2009-06-13 07:38:31 -0400 | [diff] [blame] | 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 | */ |
Andres More | cc856e6 | 2010-05-17 21:34:01 -0300 | [diff] [blame] | 183 | BOOL WCTLbHandleFragment(PSDevice pDevice, PS802_11Header pMACHeader, |
| 184 | unsigned int cbFrameLength, BOOL bWEP, BOOL bExtIV) |
Forest Bond | 92b9679 | 2009-06-13 07:38:31 -0400 | [diff] [blame] | 185 | { |
Andres More | cc856e6 | 2010-05-17 21:34:01 -0300 | [diff] [blame] | 186 | unsigned int uHeaderSize; |
Forest Bond | 92b9679 | 2009-06-13 07:38:31 -0400 | [diff] [blame] | 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 | |