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8fc8598e JC |
1 | /* |
2 | * Host AP crypt: host-based TKIP encryption implementation for Host AP driver | |
3 | * | |
4 | * Copyright (c) 2003-2004, Jouni Malinen <jkmaline@cc.hut.fi> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2 as | |
8 | * published by the Free Software Foundation. See README and COPYING for | |
9 | * more details. | |
10 | */ | |
11 | ||
12 | //#include <linux/config.h> | |
13 | #include <linux/version.h> | |
14 | #include <linux/module.h> | |
15 | #include <linux/init.h> | |
16 | #include <linux/slab.h> | |
17 | #include <linux/random.h> | |
18 | #include <linux/skbuff.h> | |
19 | #include <linux/netdevice.h> | |
20 | #include <linux/if_ether.h> | |
21 | #include <linux/if_arp.h> | |
22 | #include <asm/string.h> | |
23 | ||
24 | #include "ieee80211.h" | |
8fc8598e | 25 | |
8fc8598e | 26 | #include <linux/crypto.h> |
e406322b | 27 | #include <linux/scatterlist.h> |
8fc8598e JC |
28 | #include <linux/crc32.h> |
29 | ||
30 | MODULE_AUTHOR("Jouni Malinen"); | |
31 | MODULE_DESCRIPTION("Host AP crypt: TKIP"); | |
32 | MODULE_LICENSE("GPL"); | |
33 | ||
8fc8598e JC |
34 | struct ieee80211_tkip_data { |
35 | #define TKIP_KEY_LEN 32 | |
36 | u8 key[TKIP_KEY_LEN]; | |
37 | int key_set; | |
38 | ||
39 | u32 tx_iv32; | |
40 | u16 tx_iv16; | |
41 | u16 tx_ttak[5]; | |
42 | int tx_phase1_done; | |
43 | ||
44 | u32 rx_iv32; | |
45 | u16 rx_iv16; | |
46 | u16 rx_ttak[5]; | |
47 | int rx_phase1_done; | |
48 | u32 rx_iv32_new; | |
49 | u16 rx_iv16_new; | |
50 | ||
51 | u32 dot11RSNAStatsTKIPReplays; | |
52 | u32 dot11RSNAStatsTKIPICVErrors; | |
53 | u32 dot11RSNAStatsTKIPLocalMICFailures; | |
54 | ||
55 | int key_idx; | |
f61fb935 | 56 | |
8fc8598e JC |
57 | struct crypto_blkcipher *rx_tfm_arc4; |
58 | struct crypto_hash *rx_tfm_michael; | |
59 | struct crypto_blkcipher *tx_tfm_arc4; | |
60 | struct crypto_hash *tx_tfm_michael; | |
f61fb935 | 61 | |
8fc8598e JC |
62 | /* scratch buffers for virt_to_page() (crypto API) */ |
63 | u8 rx_hdr[16], tx_hdr[16]; | |
64 | }; | |
65 | ||
66 | static void * ieee80211_tkip_init(int key_idx) | |
67 | { | |
68 | struct ieee80211_tkip_data *priv; | |
69 | ||
7a6cb0d5 | 70 | priv = kzalloc(sizeof(*priv), GFP_ATOMIC); |
8fc8598e JC |
71 | if (priv == NULL) |
72 | goto fail; | |
8fc8598e | 73 | priv->key_idx = key_idx; |
8fc8598e | 74 | |
8fc8598e JC |
75 | priv->tx_tfm_arc4 = crypto_alloc_blkcipher("ecb(arc4)", 0, |
76 | CRYPTO_ALG_ASYNC); | |
77 | if (IS_ERR(priv->tx_tfm_arc4)) { | |
78 | printk(KERN_DEBUG "ieee80211_crypt_tkip: could not allocate " | |
79 | "crypto API arc4\n"); | |
80 | priv->tx_tfm_arc4 = NULL; | |
81 | goto fail; | |
82 | } | |
83 | ||
84 | priv->tx_tfm_michael = crypto_alloc_hash("michael_mic", 0, | |
85 | CRYPTO_ALG_ASYNC); | |
86 | if (IS_ERR(priv->tx_tfm_michael)) { | |
87 | printk(KERN_DEBUG "ieee80211_crypt_tkip: could not allocate " | |
88 | "crypto API michael_mic\n"); | |
89 | priv->tx_tfm_michael = NULL; | |
90 | goto fail; | |
91 | } | |
92 | ||
93 | priv->rx_tfm_arc4 = crypto_alloc_blkcipher("ecb(arc4)", 0, | |
94 | CRYPTO_ALG_ASYNC); | |
95 | if (IS_ERR(priv->rx_tfm_arc4)) { | |
96 | printk(KERN_DEBUG "ieee80211_crypt_tkip: could not allocate " | |
97 | "crypto API arc4\n"); | |
98 | priv->rx_tfm_arc4 = NULL; | |
99 | goto fail; | |
100 | } | |
101 | ||
102 | priv->rx_tfm_michael = crypto_alloc_hash("michael_mic", 0, | |
103 | CRYPTO_ALG_ASYNC); | |
104 | if (IS_ERR(priv->rx_tfm_michael)) { | |
105 | printk(KERN_DEBUG "ieee80211_crypt_tkip: could not allocate " | |
106 | "crypto API michael_mic\n"); | |
107 | priv->rx_tfm_michael = NULL; | |
108 | goto fail; | |
109 | } | |
f61fb935 | 110 | |
8fc8598e JC |
111 | return priv; |
112 | ||
113 | fail: | |
114 | if (priv) { | |
8fc8598e JC |
115 | if (priv->tx_tfm_michael) |
116 | crypto_free_hash(priv->tx_tfm_michael); | |
117 | if (priv->tx_tfm_arc4) | |
118 | crypto_free_blkcipher(priv->tx_tfm_arc4); | |
119 | if (priv->rx_tfm_michael) | |
120 | crypto_free_hash(priv->rx_tfm_michael); | |
121 | if (priv->rx_tfm_arc4) | |
122 | crypto_free_blkcipher(priv->rx_tfm_arc4); | |
8fc8598e JC |
123 | kfree(priv); |
124 | } | |
125 | ||
126 | return NULL; | |
127 | } | |
128 | ||
129 | ||
130 | static void ieee80211_tkip_deinit(void *priv) | |
131 | { | |
132 | struct ieee80211_tkip_data *_priv = priv; | |
f61fb935 | 133 | |
8fc8598e JC |
134 | if (_priv) { |
135 | if (_priv->tx_tfm_michael) | |
136 | crypto_free_hash(_priv->tx_tfm_michael); | |
137 | if (_priv->tx_tfm_arc4) | |
138 | crypto_free_blkcipher(_priv->tx_tfm_arc4); | |
139 | if (_priv->rx_tfm_michael) | |
140 | crypto_free_hash(_priv->rx_tfm_michael); | |
141 | if (_priv->rx_tfm_arc4) | |
142 | crypto_free_blkcipher(_priv->rx_tfm_arc4); | |
143 | } | |
8fc8598e JC |
144 | kfree(priv); |
145 | } | |
146 | ||
147 | ||
148 | static inline u16 RotR1(u16 val) | |
149 | { | |
150 | return (val >> 1) | (val << 15); | |
151 | } | |
152 | ||
153 | ||
154 | static inline u8 Lo8(u16 val) | |
155 | { | |
156 | return val & 0xff; | |
157 | } | |
158 | ||
159 | ||
160 | static inline u8 Hi8(u16 val) | |
161 | { | |
162 | return val >> 8; | |
163 | } | |
164 | ||
165 | ||
166 | static inline u16 Lo16(u32 val) | |
167 | { | |
168 | return val & 0xffff; | |
169 | } | |
170 | ||
171 | ||
172 | static inline u16 Hi16(u32 val) | |
173 | { | |
174 | return val >> 16; | |
175 | } | |
176 | ||
177 | ||
178 | static inline u16 Mk16(u8 hi, u8 lo) | |
179 | { | |
180 | return lo | (((u16) hi) << 8); | |
181 | } | |
182 | ||
183 | ||
184 | static inline u16 Mk16_le(u16 *v) | |
185 | { | |
186 | return le16_to_cpu(*v); | |
187 | } | |
188 | ||
189 | ||
190 | static const u16 Sbox[256] = | |
191 | { | |
192 | 0xC6A5, 0xF884, 0xEE99, 0xF68D, 0xFF0D, 0xD6BD, 0xDEB1, 0x9154, | |
193 | 0x6050, 0x0203, 0xCEA9, 0x567D, 0xE719, 0xB562, 0x4DE6, 0xEC9A, | |
194 | 0x8F45, 0x1F9D, 0x8940, 0xFA87, 0xEF15, 0xB2EB, 0x8EC9, 0xFB0B, | |
195 | 0x41EC, 0xB367, 0x5FFD, 0x45EA, 0x23BF, 0x53F7, 0xE496, 0x9B5B, | |
196 | 0x75C2, 0xE11C, 0x3DAE, 0x4C6A, 0x6C5A, 0x7E41, 0xF502, 0x834F, | |
197 | 0x685C, 0x51F4, 0xD134, 0xF908, 0xE293, 0xAB73, 0x6253, 0x2A3F, | |
198 | 0x080C, 0x9552, 0x4665, 0x9D5E, 0x3028, 0x37A1, 0x0A0F, 0x2FB5, | |
199 | 0x0E09, 0x2436, 0x1B9B, 0xDF3D, 0xCD26, 0x4E69, 0x7FCD, 0xEA9F, | |
200 | 0x121B, 0x1D9E, 0x5874, 0x342E, 0x362D, 0xDCB2, 0xB4EE, 0x5BFB, | |
201 | 0xA4F6, 0x764D, 0xB761, 0x7DCE, 0x527B, 0xDD3E, 0x5E71, 0x1397, | |
202 | 0xA6F5, 0xB968, 0x0000, 0xC12C, 0x4060, 0xE31F, 0x79C8, 0xB6ED, | |
203 | 0xD4BE, 0x8D46, 0x67D9, 0x724B, 0x94DE, 0x98D4, 0xB0E8, 0x854A, | |
204 | 0xBB6B, 0xC52A, 0x4FE5, 0xED16, 0x86C5, 0x9AD7, 0x6655, 0x1194, | |
205 | 0x8ACF, 0xE910, 0x0406, 0xFE81, 0xA0F0, 0x7844, 0x25BA, 0x4BE3, | |
206 | 0xA2F3, 0x5DFE, 0x80C0, 0x058A, 0x3FAD, 0x21BC, 0x7048, 0xF104, | |
207 | 0x63DF, 0x77C1, 0xAF75, 0x4263, 0x2030, 0xE51A, 0xFD0E, 0xBF6D, | |
208 | 0x814C, 0x1814, 0x2635, 0xC32F, 0xBEE1, 0x35A2, 0x88CC, 0x2E39, | |
209 | 0x9357, 0x55F2, 0xFC82, 0x7A47, 0xC8AC, 0xBAE7, 0x322B, 0xE695, | |
210 | 0xC0A0, 0x1998, 0x9ED1, 0xA37F, 0x4466, 0x547E, 0x3BAB, 0x0B83, | |
211 | 0x8CCA, 0xC729, 0x6BD3, 0x283C, 0xA779, 0xBCE2, 0x161D, 0xAD76, | |
212 | 0xDB3B, 0x6456, 0x744E, 0x141E, 0x92DB, 0x0C0A, 0x486C, 0xB8E4, | |
213 | 0x9F5D, 0xBD6E, 0x43EF, 0xC4A6, 0x39A8, 0x31A4, 0xD337, 0xF28B, | |
214 | 0xD532, 0x8B43, 0x6E59, 0xDAB7, 0x018C, 0xB164, 0x9CD2, 0x49E0, | |
215 | 0xD8B4, 0xACFA, 0xF307, 0xCF25, 0xCAAF, 0xF48E, 0x47E9, 0x1018, | |
216 | 0x6FD5, 0xF088, 0x4A6F, 0x5C72, 0x3824, 0x57F1, 0x73C7, 0x9751, | |
217 | 0xCB23, 0xA17C, 0xE89C, 0x3E21, 0x96DD, 0x61DC, 0x0D86, 0x0F85, | |
218 | 0xE090, 0x7C42, 0x71C4, 0xCCAA, 0x90D8, 0x0605, 0xF701, 0x1C12, | |
219 | 0xC2A3, 0x6A5F, 0xAEF9, 0x69D0, 0x1791, 0x9958, 0x3A27, 0x27B9, | |
220 | 0xD938, 0xEB13, 0x2BB3, 0x2233, 0xD2BB, 0xA970, 0x0789, 0x33A7, | |
221 | 0x2DB6, 0x3C22, 0x1592, 0xC920, 0x8749, 0xAAFF, 0x5078, 0xA57A, | |
222 | 0x038F, 0x59F8, 0x0980, 0x1A17, 0x65DA, 0xD731, 0x84C6, 0xD0B8, | |
223 | 0x82C3, 0x29B0, 0x5A77, 0x1E11, 0x7BCB, 0xA8FC, 0x6DD6, 0x2C3A, | |
224 | }; | |
225 | ||
226 | ||
227 | static inline u16 _S_(u16 v) | |
228 | { | |
229 | u16 t = Sbox[Hi8(v)]; | |
230 | return Sbox[Lo8(v)] ^ ((t << 8) | (t >> 8)); | |
231 | } | |
232 | ||
233 | ||
234 | #define PHASE1_LOOP_COUNT 8 | |
235 | ||
236 | ||
237 | static void tkip_mixing_phase1(u16 *TTAK, const u8 *TK, const u8 *TA, u32 IV32) | |
238 | { | |
239 | int i, j; | |
240 | ||
241 | /* Initialize the 80-bit TTAK from TSC (IV32) and TA[0..5] */ | |
242 | TTAK[0] = Lo16(IV32); | |
243 | TTAK[1] = Hi16(IV32); | |
244 | TTAK[2] = Mk16(TA[1], TA[0]); | |
245 | TTAK[3] = Mk16(TA[3], TA[2]); | |
246 | TTAK[4] = Mk16(TA[5], TA[4]); | |
247 | ||
248 | for (i = 0; i < PHASE1_LOOP_COUNT; i++) { | |
249 | j = 2 * (i & 1); | |
250 | TTAK[0] += _S_(TTAK[4] ^ Mk16(TK[1 + j], TK[0 + j])); | |
251 | TTAK[1] += _S_(TTAK[0] ^ Mk16(TK[5 + j], TK[4 + j])); | |
252 | TTAK[2] += _S_(TTAK[1] ^ Mk16(TK[9 + j], TK[8 + j])); | |
253 | TTAK[3] += _S_(TTAK[2] ^ Mk16(TK[13 + j], TK[12 + j])); | |
254 | TTAK[4] += _S_(TTAK[3] ^ Mk16(TK[1 + j], TK[0 + j])) + i; | |
255 | } | |
256 | } | |
257 | ||
258 | ||
259 | static void tkip_mixing_phase2(u8 *WEPSeed, const u8 *TK, const u16 *TTAK, | |
260 | u16 IV16) | |
261 | { | |
262 | /* Make temporary area overlap WEP seed so that the final copy can be | |
263 | * avoided on little endian hosts. */ | |
264 | u16 *PPK = (u16 *) &WEPSeed[4]; | |
265 | ||
266 | /* Step 1 - make copy of TTAK and bring in TSC */ | |
267 | PPK[0] = TTAK[0]; | |
268 | PPK[1] = TTAK[1]; | |
269 | PPK[2] = TTAK[2]; | |
270 | PPK[3] = TTAK[3]; | |
271 | PPK[4] = TTAK[4]; | |
272 | PPK[5] = TTAK[4] + IV16; | |
273 | ||
274 | /* Step 2 - 96-bit bijective mixing using S-box */ | |
275 | PPK[0] += _S_(PPK[5] ^ Mk16_le((u16 *) &TK[0])); | |
276 | PPK[1] += _S_(PPK[0] ^ Mk16_le((u16 *) &TK[2])); | |
277 | PPK[2] += _S_(PPK[1] ^ Mk16_le((u16 *) &TK[4])); | |
278 | PPK[3] += _S_(PPK[2] ^ Mk16_le((u16 *) &TK[6])); | |
279 | PPK[4] += _S_(PPK[3] ^ Mk16_le((u16 *) &TK[8])); | |
280 | PPK[5] += _S_(PPK[4] ^ Mk16_le((u16 *) &TK[10])); | |
281 | ||
282 | PPK[0] += RotR1(PPK[5] ^ Mk16_le((u16 *) &TK[12])); | |
283 | PPK[1] += RotR1(PPK[0] ^ Mk16_le((u16 *) &TK[14])); | |
284 | PPK[2] += RotR1(PPK[1]); | |
285 | PPK[3] += RotR1(PPK[2]); | |
286 | PPK[4] += RotR1(PPK[3]); | |
287 | PPK[5] += RotR1(PPK[4]); | |
288 | ||
289 | /* Step 3 - bring in last of TK bits, assign 24-bit WEP IV value | |
290 | * WEPSeed[0..2] is transmitted as WEP IV */ | |
291 | WEPSeed[0] = Hi8(IV16); | |
292 | WEPSeed[1] = (Hi8(IV16) | 0x20) & 0x7F; | |
293 | WEPSeed[2] = Lo8(IV16); | |
294 | WEPSeed[3] = Lo8((PPK[5] ^ Mk16_le((u16 *) &TK[0])) >> 1); | |
295 | ||
296 | #ifdef __BIG_ENDIAN | |
297 | { | |
298 | int i; | |
299 | for (i = 0; i < 6; i++) | |
300 | PPK[i] = (PPK[i] << 8) | (PPK[i] >> 8); | |
301 | } | |
302 | #endif | |
303 | } | |
304 | ||
305 | ||
306 | static int ieee80211_tkip_encrypt(struct sk_buff *skb, int hdr_len, void *priv) | |
307 | { | |
308 | struct ieee80211_tkip_data *tkey = priv; | |
309 | int len; | |
310 | u8 *pos; | |
311 | struct ieee80211_hdr_4addr *hdr; | |
312 | cb_desc *tcb_desc = (cb_desc *)(skb->cb + MAX_DEV_ADDR_SIZE); | |
8fc8598e JC |
313 | struct blkcipher_desc desc = {.tfm = tkey->tx_tfm_arc4}; |
314 | int ret = 0; | |
8fc8598e JC |
315 | u8 rc4key[16], *icv; |
316 | u32 crc; | |
317 | struct scatterlist sg; | |
318 | ||
319 | if (skb_headroom(skb) < 8 || skb_tailroom(skb) < 4 || | |
320 | skb->len < hdr_len) | |
321 | return -1; | |
322 | ||
323 | hdr = (struct ieee80211_hdr_4addr *) skb->data; | |
324 | ||
8fc8598e JC |
325 | if (!tcb_desc->bHwSec) |
326 | { | |
327 | if (!tkey->tx_phase1_done) { | |
328 | tkip_mixing_phase1(tkey->tx_ttak, tkey->key, hdr->addr2, | |
329 | tkey->tx_iv32); | |
330 | tkey->tx_phase1_done = 1; | |
331 | } | |
332 | tkip_mixing_phase2(rc4key, tkey->key, tkey->tx_ttak, tkey->tx_iv16); | |
333 | } | |
334 | else | |
335 | tkey->tx_phase1_done = 1; | |
336 | ||
337 | ||
338 | len = skb->len - hdr_len; | |
339 | pos = skb_push(skb, 8); | |
340 | memmove(pos, pos + 8, hdr_len); | |
341 | pos += hdr_len; | |
342 | ||
343 | if (tcb_desc->bHwSec) | |
344 | { | |
345 | *pos++ = Hi8(tkey->tx_iv16); | |
346 | *pos++ = (Hi8(tkey->tx_iv16) | 0x20) & 0x7F; | |
347 | *pos++ = Lo8(tkey->tx_iv16); | |
348 | } | |
349 | else | |
350 | { | |
351 | *pos++ = rc4key[0]; | |
352 | *pos++ = rc4key[1]; | |
353 | *pos++ = rc4key[2]; | |
354 | } | |
355 | ||
356 | *pos++ = (tkey->key_idx << 6) | (1 << 5) /* Ext IV included */; | |
357 | *pos++ = tkey->tx_iv32 & 0xff; | |
358 | *pos++ = (tkey->tx_iv32 >> 8) & 0xff; | |
359 | *pos++ = (tkey->tx_iv32 >> 16) & 0xff; | |
360 | *pos++ = (tkey->tx_iv32 >> 24) & 0xff; | |
361 | ||
362 | if (!tcb_desc->bHwSec) | |
363 | { | |
364 | icv = skb_put(skb, 4); | |
8fc8598e | 365 | crc = ~crc32_le(~0, pos, len); |
8fc8598e JC |
366 | icv[0] = crc; |
367 | icv[1] = crc >> 8; | |
368 | icv[2] = crc >> 16; | |
369 | icv[3] = crc >> 24; | |
8fc8598e | 370 | crypto_blkcipher_setkey(tkey->tx_tfm_arc4, rc4key, 16); |
8fc8598e | 371 | sg_init_one(&sg, pos, len+4); |
8fc8598e | 372 | ret= crypto_blkcipher_encrypt(&desc, &sg, &sg, len + 4); |
8fc8598e JC |
373 | } |
374 | ||
375 | tkey->tx_iv16++; | |
376 | if (tkey->tx_iv16 == 0) { | |
377 | tkey->tx_phase1_done = 0; | |
378 | tkey->tx_iv32++; | |
379 | } | |
380 | ||
381 | if (!tcb_desc->bHwSec) | |
8fc8598e | 382 | return ret; |
8fc8598e | 383 | else |
e406322b | 384 | return 0; |
8fc8598e JC |
385 | |
386 | ||
387 | } | |
388 | ||
389 | static int ieee80211_tkip_decrypt(struct sk_buff *skb, int hdr_len, void *priv) | |
390 | { | |
391 | struct ieee80211_tkip_data *tkey = priv; | |
392 | u8 keyidx, *pos; | |
393 | u32 iv32; | |
394 | u16 iv16; | |
395 | struct ieee80211_hdr_4addr *hdr; | |
396 | cb_desc *tcb_desc = (cb_desc *)(skb->cb + MAX_DEV_ADDR_SIZE); | |
8fc8598e | 397 | struct blkcipher_desc desc = {.tfm = tkey->rx_tfm_arc4}; |
8fc8598e JC |
398 | u8 rc4key[16]; |
399 | u8 icv[4]; | |
400 | u32 crc; | |
401 | struct scatterlist sg; | |
402 | int plen; | |
403 | if (skb->len < hdr_len + 8 + 4) | |
404 | return -1; | |
405 | ||
406 | hdr = (struct ieee80211_hdr_4addr *) skb->data; | |
407 | pos = skb->data + hdr_len; | |
408 | keyidx = pos[3]; | |
409 | if (!(keyidx & (1 << 5))) { | |
410 | if (net_ratelimit()) { | |
411 | printk(KERN_DEBUG "TKIP: received packet without ExtIV" | |
0ee9f67c | 412 | " flag from %pM\n", hdr->addr2); |
8fc8598e JC |
413 | } |
414 | return -2; | |
415 | } | |
416 | keyidx >>= 6; | |
417 | if (tkey->key_idx != keyidx) { | |
418 | printk(KERN_DEBUG "TKIP: RX tkey->key_idx=%d frame " | |
419 | "keyidx=%d priv=%p\n", tkey->key_idx, keyidx, priv); | |
420 | return -6; | |
421 | } | |
422 | if (!tkey->key_set) { | |
423 | if (net_ratelimit()) { | |
0ee9f67c | 424 | printk(KERN_DEBUG "TKIP: received packet from %pM" |
8fc8598e | 425 | " with keyid=%d that does not have a configured" |
0ee9f67c | 426 | " key\n", hdr->addr2, keyidx); |
8fc8598e JC |
427 | } |
428 | return -3; | |
429 | } | |
430 | iv16 = (pos[0] << 8) | pos[2]; | |
431 | iv32 = pos[4] | (pos[5] << 8) | (pos[6] << 16) | (pos[7] << 24); | |
432 | pos += 8; | |
433 | ||
434 | if (!tcb_desc->bHwSec) | |
435 | { | |
436 | if (iv32 < tkey->rx_iv32 || | |
437 | (iv32 == tkey->rx_iv32 && iv16 <= tkey->rx_iv16)) { | |
438 | if (net_ratelimit()) { | |
0ee9f67c | 439 | printk(KERN_DEBUG "TKIP: replay detected: STA=%pM" |
8fc8598e | 440 | " previous TSC %08x%04x received TSC " |
0ee9f67c | 441 | "%08x%04x\n", hdr->addr2, |
8fc8598e JC |
442 | tkey->rx_iv32, tkey->rx_iv16, iv32, iv16); |
443 | } | |
444 | tkey->dot11RSNAStatsTKIPReplays++; | |
445 | return -4; | |
446 | } | |
447 | ||
448 | if (iv32 != tkey->rx_iv32 || !tkey->rx_phase1_done) { | |
449 | tkip_mixing_phase1(tkey->rx_ttak, tkey->key, hdr->addr2, iv32); | |
450 | tkey->rx_phase1_done = 1; | |
451 | } | |
452 | tkip_mixing_phase2(rc4key, tkey->key, tkey->rx_ttak, iv16); | |
453 | ||
454 | plen = skb->len - hdr_len - 12; | |
455 | ||
8fc8598e | 456 | crypto_blkcipher_setkey(tkey->rx_tfm_arc4, rc4key, 16); |
8fc8598e | 457 | sg_init_one(&sg, pos, plen+4); |
f61fb935 | 458 | |
8fc8598e JC |
459 | if (crypto_blkcipher_decrypt(&desc, &sg, &sg, plen + 4)) { |
460 | if (net_ratelimit()) { | |
461 | printk(KERN_DEBUG ": TKIP: failed to decrypt " | |
0ee9f67c JP |
462 | "received packet from %pM\n", |
463 | hdr->addr2); | |
8fc8598e JC |
464 | } |
465 | return -7; | |
466 | } | |
8fc8598e | 467 | |
8fc8598e | 468 | crc = ~crc32_le(~0, pos, plen); |
8fc8598e JC |
469 | icv[0] = crc; |
470 | icv[1] = crc >> 8; | |
471 | icv[2] = crc >> 16; | |
472 | icv[3] = crc >> 24; | |
473 | ||
474 | if (memcmp(icv, pos + plen, 4) != 0) { | |
475 | if (iv32 != tkey->rx_iv32) { | |
476 | /* Previously cached Phase1 result was already lost, so | |
477 | * it needs to be recalculated for the next packet. */ | |
478 | tkey->rx_phase1_done = 0; | |
479 | } | |
480 | if (net_ratelimit()) { | |
481 | printk(KERN_DEBUG "TKIP: ICV error detected: STA=" | |
0ee9f67c | 482 | "%pM\n", hdr->addr2); |
8fc8598e JC |
483 | } |
484 | tkey->dot11RSNAStatsTKIPICVErrors++; | |
485 | return -5; | |
486 | } | |
487 | ||
488 | } | |
489 | ||
490 | /* Update real counters only after Michael MIC verification has | |
491 | * completed */ | |
492 | tkey->rx_iv32_new = iv32; | |
493 | tkey->rx_iv16_new = iv16; | |
494 | ||
495 | /* Remove IV and ICV */ | |
496 | memmove(skb->data + 8, skb->data, hdr_len); | |
497 | skb_pull(skb, 8); | |
498 | skb_trim(skb, skb->len - 4); | |
499 | ||
8fc8598e JC |
500 | return keyidx; |
501 | } | |
502 | ||
8fc8598e | 503 | static int michael_mic(struct crypto_hash *tfm_michael, u8 * key, u8 * hdr, |
e406322b | 504 | u8 * data, size_t data_len, u8 * mic) |
8fc8598e | 505 | { |
e406322b MCC |
506 | struct hash_desc desc; |
507 | struct scatterlist sg[2]; | |
8fc8598e | 508 | |
e406322b MCC |
509 | if (tfm_michael == NULL) { |
510 | printk(KERN_WARNING "michael_mic: tfm_michael == NULL\n"); | |
511 | return -1; | |
512 | } | |
f61fb935 | 513 | |
e406322b MCC |
514 | sg_init_table(sg, 2); |
515 | sg_set_buf(&sg[0], hdr, 16); | |
516 | sg_set_buf(&sg[1], data, data_len); | |
8fc8598e | 517 | |
e406322b MCC |
518 | if (crypto_hash_setkey(tfm_michael, key, 8)) |
519 | return -1; | |
8fc8598e | 520 | |
e406322b MCC |
521 | desc.tfm = tfm_michael; |
522 | desc.flags = 0; | |
523 | return crypto_hash_digest(&desc, sg, data_len + 16, mic); | |
8fc8598e | 524 | } |
8fc8598e JC |
525 | |
526 | static void michael_mic_hdr(struct sk_buff *skb, u8 *hdr) | |
527 | { | |
528 | struct ieee80211_hdr_4addr *hdr11; | |
529 | ||
530 | hdr11 = (struct ieee80211_hdr_4addr *) skb->data; | |
531 | switch (le16_to_cpu(hdr11->frame_ctl) & | |
532 | (IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS)) { | |
533 | case IEEE80211_FCTL_TODS: | |
534 | memcpy(hdr, hdr11->addr3, ETH_ALEN); /* DA */ | |
535 | memcpy(hdr + ETH_ALEN, hdr11->addr2, ETH_ALEN); /* SA */ | |
536 | break; | |
537 | case IEEE80211_FCTL_FROMDS: | |
538 | memcpy(hdr, hdr11->addr1, ETH_ALEN); /* DA */ | |
539 | memcpy(hdr + ETH_ALEN, hdr11->addr3, ETH_ALEN); /* SA */ | |
540 | break; | |
541 | case IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS: | |
542 | memcpy(hdr, hdr11->addr3, ETH_ALEN); /* DA */ | |
543 | memcpy(hdr + ETH_ALEN, hdr11->addr4, ETH_ALEN); /* SA */ | |
544 | break; | |
545 | case 0: | |
546 | memcpy(hdr, hdr11->addr1, ETH_ALEN); /* DA */ | |
547 | memcpy(hdr + ETH_ALEN, hdr11->addr2, ETH_ALEN); /* SA */ | |
548 | break; | |
549 | } | |
550 | ||
551 | hdr[12] = 0; /* priority */ | |
552 | ||
553 | hdr[13] = hdr[14] = hdr[15] = 0; /* reserved */ | |
554 | } | |
555 | ||
556 | ||
557 | static int ieee80211_michael_mic_add(struct sk_buff *skb, int hdr_len, void *priv) | |
558 | { | |
559 | struct ieee80211_tkip_data *tkey = priv; | |
560 | u8 *pos; | |
561 | struct ieee80211_hdr_4addr *hdr; | |
562 | ||
563 | hdr = (struct ieee80211_hdr_4addr *) skb->data; | |
564 | ||
565 | if (skb_tailroom(skb) < 8 || skb->len < hdr_len) { | |
566 | printk(KERN_DEBUG "Invalid packet for Michael MIC add " | |
567 | "(tailroom=%d hdr_len=%d skb->len=%d)\n", | |
568 | skb_tailroom(skb), hdr_len, skb->len); | |
569 | return -1; | |
570 | } | |
571 | ||
572 | michael_mic_hdr(skb, tkey->tx_hdr); | |
573 | ||
574 | // { david, 2006.9.1 | |
575 | // fix the wpa process with wmm enabled. | |
576 | if(IEEE80211_QOS_HAS_SEQ(le16_to_cpu(hdr->frame_ctl))) { | |
577 | tkey->tx_hdr[12] = *(skb->data + hdr_len - 2) & 0x07; | |
578 | } | |
579 | // } | |
580 | pos = skb_put(skb, 8); | |
f61fb935 | 581 | |
8fc8598e JC |
582 | if (michael_mic(tkey->tx_tfm_michael, &tkey->key[16], tkey->tx_hdr, |
583 | skb->data + hdr_len, skb->len - 8 - hdr_len, pos)) | |
8fc8598e JC |
584 | return -1; |
585 | ||
586 | return 0; | |
587 | } | |
588 | ||
8fc8598e JC |
589 | static void ieee80211_michael_mic_failure(struct net_device *dev, |
590 | struct ieee80211_hdr_4addr *hdr, | |
591 | int keyidx) | |
592 | { | |
593 | union iwreq_data wrqu; | |
594 | struct iw_michaelmicfailure ev; | |
595 | ||
596 | /* TODO: needed parameters: count, keyid, key type, TSC */ | |
597 | memset(&ev, 0, sizeof(ev)); | |
598 | ev.flags = keyidx & IW_MICFAILURE_KEY_ID; | |
599 | if (hdr->addr1[0] & 0x01) | |
600 | ev.flags |= IW_MICFAILURE_GROUP; | |
601 | else | |
602 | ev.flags |= IW_MICFAILURE_PAIRWISE; | |
603 | ev.src_addr.sa_family = ARPHRD_ETHER; | |
604 | memcpy(ev.src_addr.sa_data, hdr->addr2, ETH_ALEN); | |
605 | memset(&wrqu, 0, sizeof(wrqu)); | |
606 | wrqu.data.length = sizeof(ev); | |
607 | wireless_send_event(dev, IWEVMICHAELMICFAILURE, &wrqu, (char *) &ev); | |
608 | } | |
8fc8598e JC |
609 | |
610 | static int ieee80211_michael_mic_verify(struct sk_buff *skb, int keyidx, | |
611 | int hdr_len, void *priv) | |
612 | { | |
613 | struct ieee80211_tkip_data *tkey = priv; | |
614 | u8 mic[8]; | |
615 | struct ieee80211_hdr_4addr *hdr; | |
616 | ||
617 | hdr = (struct ieee80211_hdr_4addr *) skb->data; | |
618 | ||
619 | if (!tkey->key_set) | |
620 | return -1; | |
621 | ||
622 | michael_mic_hdr(skb, tkey->rx_hdr); | |
623 | // { david, 2006.9.1 | |
624 | // fix the wpa process with wmm enabled. | |
625 | if(IEEE80211_QOS_HAS_SEQ(le16_to_cpu(hdr->frame_ctl))) { | |
626 | tkey->rx_hdr[12] = *(skb->data + hdr_len - 2) & 0x07; | |
627 | } | |
628 | // } | |
629 | ||
8fc8598e JC |
630 | if (michael_mic(tkey->rx_tfm_michael, &tkey->key[24], tkey->rx_hdr, |
631 | skb->data + hdr_len, skb->len - 8 - hdr_len, mic)) | |
e406322b | 632 | return -1; |
8fc8598e JC |
633 | if (memcmp(mic, skb->data + skb->len - 8, 8) != 0) { |
634 | struct ieee80211_hdr_4addr *hdr; | |
635 | hdr = (struct ieee80211_hdr_4addr *) skb->data; | |
636 | printk(KERN_DEBUG "%s: Michael MIC verification failed for " | |
0ee9f67c JP |
637 | "MSDU from %pM keyidx=%d\n", |
638 | skb->dev ? skb->dev->name : "N/A", hdr->addr2, | |
8fc8598e JC |
639 | keyidx); |
640 | if (skb->dev) | |
641 | ieee80211_michael_mic_failure(skb->dev, hdr, keyidx); | |
642 | tkey->dot11RSNAStatsTKIPLocalMICFailures++; | |
643 | return -1; | |
644 | } | |
645 | ||
646 | /* Update TSC counters for RX now that the packet verification has | |
647 | * completed. */ | |
648 | tkey->rx_iv32 = tkey->rx_iv32_new; | |
649 | tkey->rx_iv16 = tkey->rx_iv16_new; | |
650 | ||
651 | skb_trim(skb, skb->len - 8); | |
652 | ||
653 | return 0; | |
654 | } | |
655 | ||
656 | ||
657 | static int ieee80211_tkip_set_key(void *key, int len, u8 *seq, void *priv) | |
658 | { | |
659 | struct ieee80211_tkip_data *tkey = priv; | |
660 | int keyidx; | |
8fc8598e JC |
661 | struct crypto_hash *tfm = tkey->tx_tfm_michael; |
662 | struct crypto_blkcipher *tfm2 = tkey->tx_tfm_arc4; | |
663 | struct crypto_hash *tfm3 = tkey->rx_tfm_michael; | |
664 | struct crypto_blkcipher *tfm4 = tkey->rx_tfm_arc4; | |
8fc8598e JC |
665 | |
666 | keyidx = tkey->key_idx; | |
667 | memset(tkey, 0, sizeof(*tkey)); | |
668 | tkey->key_idx = keyidx; | |
8fc8598e JC |
669 | tkey->tx_tfm_michael = tfm; |
670 | tkey->tx_tfm_arc4 = tfm2; | |
671 | tkey->rx_tfm_michael = tfm3; | |
672 | tkey->rx_tfm_arc4 = tfm4; | |
8fc8598e JC |
673 | |
674 | if (len == TKIP_KEY_LEN) { | |
675 | memcpy(tkey->key, key, TKIP_KEY_LEN); | |
676 | tkey->key_set = 1; | |
677 | tkey->tx_iv16 = 1; /* TSC is initialized to 1 */ | |
678 | if (seq) { | |
679 | tkey->rx_iv32 = (seq[5] << 24) | (seq[4] << 16) | | |
680 | (seq[3] << 8) | seq[2]; | |
681 | tkey->rx_iv16 = (seq[1] << 8) | seq[0]; | |
682 | } | |
683 | } else if (len == 0) | |
684 | tkey->key_set = 0; | |
685 | else | |
686 | return -1; | |
687 | ||
688 | return 0; | |
689 | } | |
690 | ||
691 | ||
692 | static int ieee80211_tkip_get_key(void *key, int len, u8 *seq, void *priv) | |
693 | { | |
694 | struct ieee80211_tkip_data *tkey = priv; | |
695 | ||
696 | if (len < TKIP_KEY_LEN) | |
697 | return -1; | |
698 | ||
699 | if (!tkey->key_set) | |
700 | return 0; | |
701 | memcpy(key, tkey->key, TKIP_KEY_LEN); | |
702 | ||
703 | if (seq) { | |
704 | /* Return the sequence number of the last transmitted frame. */ | |
705 | u16 iv16 = tkey->tx_iv16; | |
706 | u32 iv32 = tkey->tx_iv32; | |
707 | if (iv16 == 0) | |
708 | iv32--; | |
709 | iv16--; | |
710 | seq[0] = tkey->tx_iv16; | |
711 | seq[1] = tkey->tx_iv16 >> 8; | |
712 | seq[2] = tkey->tx_iv32; | |
713 | seq[3] = tkey->tx_iv32 >> 8; | |
714 | seq[4] = tkey->tx_iv32 >> 16; | |
715 | seq[5] = tkey->tx_iv32 >> 24; | |
716 | } | |
717 | ||
718 | return TKIP_KEY_LEN; | |
719 | } | |
720 | ||
721 | ||
722 | static char * ieee80211_tkip_print_stats(char *p, void *priv) | |
723 | { | |
724 | struct ieee80211_tkip_data *tkip = priv; | |
725 | p += sprintf(p, "key[%d] alg=TKIP key_set=%d " | |
726 | "tx_pn=%02x%02x%02x%02x%02x%02x " | |
727 | "rx_pn=%02x%02x%02x%02x%02x%02x " | |
728 | "replays=%d icv_errors=%d local_mic_failures=%d\n", | |
729 | tkip->key_idx, tkip->key_set, | |
730 | (tkip->tx_iv32 >> 24) & 0xff, | |
731 | (tkip->tx_iv32 >> 16) & 0xff, | |
732 | (tkip->tx_iv32 >> 8) & 0xff, | |
733 | tkip->tx_iv32 & 0xff, | |
734 | (tkip->tx_iv16 >> 8) & 0xff, | |
735 | tkip->tx_iv16 & 0xff, | |
736 | (tkip->rx_iv32 >> 24) & 0xff, | |
737 | (tkip->rx_iv32 >> 16) & 0xff, | |
738 | (tkip->rx_iv32 >> 8) & 0xff, | |
739 | tkip->rx_iv32 & 0xff, | |
740 | (tkip->rx_iv16 >> 8) & 0xff, | |
741 | tkip->rx_iv16 & 0xff, | |
742 | tkip->dot11RSNAStatsTKIPReplays, | |
743 | tkip->dot11RSNAStatsTKIPICVErrors, | |
744 | tkip->dot11RSNAStatsTKIPLocalMICFailures); | |
745 | return p; | |
746 | } | |
747 | ||
748 | ||
749 | static struct ieee80211_crypto_ops ieee80211_crypt_tkip = { | |
750 | .name = "TKIP", | |
751 | .init = ieee80211_tkip_init, | |
752 | .deinit = ieee80211_tkip_deinit, | |
753 | .encrypt_mpdu = ieee80211_tkip_encrypt, | |
754 | .decrypt_mpdu = ieee80211_tkip_decrypt, | |
755 | .encrypt_msdu = ieee80211_michael_mic_add, | |
756 | .decrypt_msdu = ieee80211_michael_mic_verify, | |
757 | .set_key = ieee80211_tkip_set_key, | |
758 | .get_key = ieee80211_tkip_get_key, | |
759 | .print_stats = ieee80211_tkip_print_stats, | |
760 | .extra_prefix_len = 4 + 4, /* IV + ExtIV */ | |
761 | .extra_postfix_len = 8 + 4, /* MIC + ICV */ | |
e406322b | 762 | .owner = THIS_MODULE, |
8fc8598e JC |
763 | }; |
764 | ||
f61fb935 | 765 | int __init ieee80211_crypto_tkip_init(void) |
8fc8598e JC |
766 | { |
767 | return ieee80211_register_crypto_ops(&ieee80211_crypt_tkip); | |
768 | } | |
769 | ||
f61fb935 | 770 | void __exit ieee80211_crypto_tkip_exit(void) |
8fc8598e JC |
771 | { |
772 | ieee80211_unregister_crypto_ops(&ieee80211_crypt_tkip); | |
773 | } | |
774 | ||
775 | void ieee80211_tkip_null(void) | |
776 | { | |
777 | // printk("============>%s()\n", __FUNCTION__); | |
e406322b | 778 | return; |
8fc8598e | 779 | } |