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MOXA linux-2.6.x / linux-2.6.9-uc0 from sdlinux-moxaart.tgz
[linux-2.6.9-moxart.git] / drivers / net / wireless / rtlink / rtmp_tkip.c
blobc322b1fcc36da52a79725eb2d68ffa582db8119d
1 /*************************************************************************
2 * Ralink Tech Inc. *
3 * 4F, No. 2 Technology 5th Rd. *
4 * Science-based Industrial Park *
5 * Hsin-chu, Taiwan, R.O.C. *
6 * *
7 * (c) Copyright 2002, Ralink Technology, Inc. *
8 * *
9 * This program is free software; you can redistribute it and/or modify *
10 * it under the terms of the GNU General Public License as published by *
11 * the Free Software Foundation; either version 2 of the License, or *
12 * (at your option) any later version. *
13 * *
14 * This program is distributed in the hope that it will be useful, *
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of *
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
17 * GNU General Public License for more details. *
18 * *
19 * You should have received a copy of the GNU General Public License *
20 * along with this program; if not, write to the *
21 * Free Software Foundation, Inc., *
22 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
23 * *
24 *************************************************************************
25
26 Module Name:
27 rtmp_tkip.c
28
29 Abstract:
30
31 Revision History:
32 Who When What
33 -------- ---------- ----------------------------------------------
34 Paul Wu 02-25-02 Initial
35 */
36
37 #include "rt_config.h"
38
39 // Rotation functions on 32 bit values
40 #define ROL32( A, n ) ( ((A) << (n)) | ( ((A)>>(32-(n))) ) )
41 #define ROR32( A, n ) ROL32( (A), 32-(n) )
42
43 /*
44 ========================================================================
45
46 Routine Description:
47 Convert from UCHAR[] to ULONG in a portable way
48
49 Arguments:
50 pMICKey pointer to MIC Key
51
52 Return Value:
53 None
54
55 Note:
56
57 ========================================================================
58 */
59 ULONG RTMPTkipGetUInt32(
60 IN PUCHAR pMICKey)
61 {
62 ULONG res = 0;
63 int i;
64
65 for (i = 0; i < 4; i++)
66 {
67 res |= (*pMICKey++) << (8 * i);
68 }
69
70 return res;
71 }
72
73 /*
74 ========================================================================
75
76 Routine Description:
77 Convert from ULONG to UCHAR[] in a portable way
78
79 Arguments:
80 pDst pointer to destination for convert ULONG to UCHAR[]
81 val the value for convert
82
83 Return Value:
84 None
85
86 Note:
87
88 ========================================================================
89 */
90 VOID RTMPTkipPutUInt32(
91 IN OUT PUCHAR pDst,
92 IN ULONG val)
93 {
94 int i;
95
96 for(i = 0; i < 4; i++)
97 {
98 *pDst++ = (UCHAR) val;
99 val >>= 8;
100 }
101 }
102
103 /*
104 ========================================================================
105
106 Routine Description:
107 Calculate the MIC Value.
108
109 Arguments:
110 pAdapter Pointer to our adapter
111 pSrc Pointer to source data for Calculate MIC Value
112 Len Indicate the length of the source data
113
114 Return Value:
115 None
116
117 Note:
118
119 ========================================================================
120 */
121 VOID RTMPTkipAppend(
122 IN PTKIP_KEY_INFO pTkip,
123 IN PUCHAR pSrc,
124 IN UINT nBytes)
125 {
126 register ULONG M, L, R, nBytesInM;
127
128 // load data from memory to register
129 L = pTkip->L;
130 R = pTkip->R;
131 nBytesInM = pTkip->nBytesInM;
132 M = pTkip->M;
133
134 // Alignment case
135 if((nBytesInM == 0) && ((((unsigned long)pSrc) & 0x3) == 0))
136 {
137 while(nBytes >= 4)
138 {
139 #ifdef BIG_ENDIAN
140 M = SWAP32(*(ULONG *)pSrc);
141 #else
142 M = *(ULONG *)pSrc;
143 #endif
144 pSrc += 4;
145 nBytes -= 4;
146
147 L ^= M;
148 R ^= ROL32( L, 17 );
149 L += R;
150 R ^= ((L & 0xff00ff00) >> 8) | ((L & 0x00ff00ff) << 8);
151 L += R;
152 R ^= ROL32( L, 3 );
153 L += R;
154 R ^= ROR32( L, 2 );
155 L += R;
156 }
157 nBytesInM = 0;
158 M = 0;
159
160 while(nBytes > 0)
161 {
162 M |= (*pSrc << (8* nBytesInM));
163
164 nBytesInM++;
165 pSrc++;
166 nBytes--;
167
168 if( nBytesInM >= 4 )
169 {
170 L ^= M;
171 R ^= ROL32( L, 17 );
172 L += R;
173 R ^= ((L & 0xff00ff00) >> 8) | ((L & 0x00ff00ff) << 8);
174 L += R;
175 R ^= ROL32( L, 3 );
176 L += R;
177 R ^= ROR32( L, 2 );
178 L += R;
179 // Clear the buffer
180 M = 0;
181 nBytesInM = 0;
182 }
183 }
184 }
185 else
186 { // misAlignment case
187 while(nBytes > 0)
188 {
189 M |= (*pSrc << (8* nBytesInM));
190 nBytesInM++;
191
192 pSrc++;
193 nBytes--;
194
195 if( nBytesInM >= 4 )
196 {
197 L ^= M;
198 R ^= ROL32( L, 17 );
199 L += R;
200 R ^= ((L & 0xff00ff00) >> 8) | ((L & 0x00ff00ff) << 8);
201 L += R;
202 R ^= ROL32( L, 3 );
203 L += R;
204 R ^= ROR32( L, 2 );
205 L += R;
206 // Clear the buffer
207 M = 0;
208 nBytesInM = 0;
209 }
210 }
211 }
212
213 // load data from register to memory
214 pTkip->M = M;
215 pTkip->nBytesInM = nBytesInM;
216 pTkip->L = L;
217 pTkip->R = R;
218 }
219
220 /*
221 ========================================================================
222
223 Routine Description:
224 Get the MIC Value.
225
226 Arguments:
227 pAdapter Pointer to our adapter
228
229 Return Value:
230 None
231
232 Note:
233 the MIC Value is store in pAdapter->PrivateInfo.MIC
234 ========================================================================
235 */
236 VOID RTMPTkipGetMIC(
237 IN PTKIP_KEY_INFO pTkip)
238 {
239 static unsigned char Last[] = {"\x5a\x00\x00\x00\x00\x00\x00\x00"};
240
241 // Append the minimum padding
242 RTMPTkipAppend(pTkip, Last, 8 - pTkip->nBytesInM);
243
244 // The appendByte function has already computed the result.
245 RTMPTkipPutUInt32(pTkip->MIC, pTkip->L);
246 RTMPTkipPutUInt32(pTkip->MIC + 4, pTkip->R);
247 }
248
249 /*
250 ========================================================================
251
252 Routine Description:
253 Compare MIC value of received MSDU
254
255 Arguments:
256 pAdapter Pointer to our adapter
257 pSrc Pointer to the received Plain text data
258 pDA Pointer to DA address
259 pSA Pointer to SA address
260 pMICKey pointer to MIC Key
261 Len the length of the received plain text data exclude MIC value
262
263 Return Value:
264 TRUE MIC value matched
265 FALSE MIC value mismatched
266
267 Note:
268
269 ========================================================================
270 */
271 BOOLEAN RTMPTkipCompareMICValue(
272 IN PRTMP_ADAPTER pAdapter,
273 IN PUCHAR pSrc,
274 IN PUCHAR pDA,
275 IN PUCHAR pSA,
276 IN PUCHAR pMICKey,
277 IN UINT Len)
278 {
279 static UCHAR Priority[4] = {"\x00\x00\x00\x00"};
280
281 // Init MIC value calculation and reset the message
282 pAdapter->PrivateInfo.Rx.L = RTMPTkipGetUInt32(pMICKey);
283 pAdapter->PrivateInfo.Rx.R = RTMPTkipGetUInt32(pMICKey + 4);
284 pAdapter->PrivateInfo.Rx.nBytesInM = 0;
285 pAdapter->PrivateInfo.Rx.M = 0;
286
287 // DA
288 RTMPTkipAppend(&pAdapter->PrivateInfo.Rx, pDA, 6);
289 // SA
290 RTMPTkipAppend(&pAdapter->PrivateInfo.Rx, pSA, 6);
291 // Priority + 3 bytes of 0
292 RTMPTkipAppend(&pAdapter->PrivateInfo.Rx, Priority, 4);
293
294 // Calculate MIC value from plain text data
295 RTMPTkipAppend(&pAdapter->PrivateInfo.Rx, pSrc, Len);
296
297 // Get MIC value from decrypted plain data
298 RTMPTkipGetMIC(&pAdapter->PrivateInfo.Rx);
299
300 // Move MIC value from MSDU, this steps should move to data path.
301 // Since the MIC value might cross MPDUs.
302 if(!NdisEqualMemory(pAdapter->PrivateInfo.Rx.MIC, pSrc + Len, 8))
303 {
304 INT i;
305
306 DBGPRINT(RT_DEBUG_ERROR, "! TKIP MIC Error !\n"); //MIC error.
307 DBGPRINT(RT_DEBUG_INFO, "Orig MIC value ="); //MIC error.
308 for (i = 0; i < 8; i++)
309 {
310 DBGPRINT(RT_DEBUG_INFO, "%02x:", *(UCHAR*)(pSrc + Len + i)); //MIC error.
311 }
312 DBGPRINT(RT_DEBUG_INFO, "\n"); //MIC error.
313 DBGPRINT(RT_DEBUG_INFO, "Calculated MIC value ="); //MIC error.
314 for (i = 0; i < 8; i++)
315 {
316 DBGPRINT(RT_DEBUG_INFO, "%02x:", pAdapter->PrivateInfo.Rx.MIC[i]); //MIC error.
317 }
318 DBGPRINT(RT_DEBUG_INFO, "\n"); //MIC error.
319 return (FALSE);
320 }
321 return (TRUE);
322 }
323
324 /*
325 ========================================================================
326
327 Routine Description:
328 Compare MIC value of received MSDU
329
330 Arguments:
331 pAdapter Pointer to our adapter
332 pLLC LLC header
333 pSrc Pointer to the received Plain text data
334 pDA Pointer to DA address
335 pSA Pointer to SA address
336 pMICKey pointer to MIC Key
337 Len the length of the received plain text data exclude MIC value
338
339 Return Value:
340 TRUE MIC value matched
341 FALSE MIC value mismatched
342
343 Note:
344
345 ========================================================================
346 */
347 BOOLEAN RTMPTkipCompareMICValueWithLLC(
348 IN PRTMP_ADAPTER pAdapter,
349 IN PUCHAR pLLC,
350 IN PUCHAR pSrc,
351 IN PUCHAR pDA,
352 IN PUCHAR pSA,
353 IN PUCHAR pMICKey,
354 IN UINT Len)
355 {
356 static UCHAR Priority[4] = {"\x00\x00\x00\x00"};
357
358 // Init MIC value calculation and reset the message
359 pAdapter->PrivateInfo.Rx.L = RTMPTkipGetUInt32(pMICKey);
360 pAdapter->PrivateInfo.Rx.R = RTMPTkipGetUInt32(pMICKey + 4);
361 pAdapter->PrivateInfo.Rx.nBytesInM = 0;
362 pAdapter->PrivateInfo.Rx.M = 0;
363
364 // DA
365 RTMPTkipAppend(&pAdapter->PrivateInfo.Rx, pDA, 6);
366 // SA
367 RTMPTkipAppend(&pAdapter->PrivateInfo.Rx, pSA, 6);
368 // Priority + 3 bytes of 0
369 RTMPTkipAppend(&pAdapter->PrivateInfo.Rx, Priority, 4);
370
371 // Start with LLC header
372 RTMPTkipAppend(&pAdapter->PrivateInfo.Rx, pLLC, 8);
373
374 // Calculate MIC value from plain text data
375 RTMPTkipAppend(&pAdapter->PrivateInfo.Rx, pSrc, Len);
376
377 // Get MIC value from decrypted plain data
378 RTMPTkipGetMIC(&pAdapter->PrivateInfo.Rx);
379
380 // Move MIC value from MSDU, this steps should move to data path.
381 // Since the MIC value might cross MPDUs.
382 if(!NdisEqualMemory(pAdapter->PrivateInfo.Rx.MIC, pSrc + Len, 8))
383 {
384 INT i;
385
386 DBGPRINT(RT_DEBUG_ERROR, "! TKIP MIC Error !\n"); //MIC error.
387 DBGPRINT(RT_DEBUG_INFO, "Orig MIC value ="); //MIC error.
388 for (i = 0; i < 8; i++)
389 {
390 DBGPRINT(RT_DEBUG_INFO, "%02x:", *(UCHAR *)(pSrc + Len + i)); //MIC error.
391 }
392
393 DBGPRINT(RT_DEBUG_INFO, "\n"); //MIC error.
394 DBGPRINT(RT_DEBUG_INFO, "Calculated MIC value ="); //MIC error.
395 for (i = 0; i < 8; i++)
396 {
397 DBGPRINT(RT_DEBUG_INFO, "%02x:", pAdapter->PrivateInfo.Rx.MIC[i]); //MIC error.
398 }
399
400 DBGPRINT(RT_DEBUG_INFO, "\n"); //MIC error.
401 return (FALSE);
402 }
403 return (TRUE);
404 }
405
406 /*
407 ========================================================================
408
409 Routine Description:
410 Copy frame from waiting queue into relative ring buffer and set
411 appropriate ASIC register to kick hardware transmit function
412
413 Arguments:
414 pAdapter Pointer to our adapter
415 PNDIS_PACKET Pointer to Ndis Packet for MIC calculation
416 pEncap Pointer to LLC encap data
417 LenEncap Total encap length, might be 0 which indicates no encap
418
419 Return Value:
420 None
421
422 Note:
423
424 ========================================================================
425 */
426 VOID RTMPCalculateMICValue(
427 IN PRTMP_ADAPTER pAdapter,
428 IN struct sk_buff *skb,
429 IN PUCHAR pEncap,
430 IN INT LenEncap,
431 IN PWPA_KEY pWpaKey)
432 {
433 PUCHAR pSrc;
434 static UCHAR Priority[4] = {"\x00\x00\x00\x00"};
435
436 pSrc = (PUCHAR) skb->data;
437
438 // Init MIC value calculation and reset the message
439 pAdapter->PrivateInfo.Tx.L = RTMPTkipGetUInt32(pWpaKey->TxMic);
440 pAdapter->PrivateInfo.Tx.R = RTMPTkipGetUInt32(pWpaKey->TxMic + 4);
441 pAdapter->PrivateInfo.Tx.nBytesInM = 0;
442 pAdapter->PrivateInfo.Tx.M = 0;
443
444 // DA & SA field
445 RTMPTkipAppend(&pAdapter->PrivateInfo.Tx, pSrc, 12);
446
447 // Priority + 3 bytes of 0
448 RTMPTkipAppend(&pAdapter->PrivateInfo.Tx, Priority, 4);
449
450 if (LenEncap > 0)
451 {
452 // LLC encapsulation
453 RTMPTkipAppend(&pAdapter->PrivateInfo.Tx, pEncap, LenEncap);
454 // Protocol Type
455 RTMPTkipAppend(&pAdapter->PrivateInfo.Tx, pSrc + 12, skb->len - 12);
456 }
457 else
458 RTMPTkipAppend(&pAdapter->PrivateInfo.Tx, pSrc + 14, skb->len - 14);
459
460 // Compute the final MIC Value
461 RTMPTkipGetMIC(&pAdapter->PrivateInfo.Tx);
462 }
463
MOXA 2.6.9 from sdlinux-moxaart.tgz