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Commit | Line | Data |
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ecdfa446 GKH |
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 | ||
a1d38394 HX |
12 | #include <crypto/hash.h> |
13 | #include <crypto/skcipher.h> | |
ecdfa446 GKH |
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> | |
a44325f9 | 22 | #include <linux/string.h> |
cb762154 | 23 | #include <linux/scatterlist.h> |
ecdfa446 | 24 | #include <linux/crc32.h> |
b57ceb19 | 25 | #include <linux/etherdevice.h> |
ecdfa446 | 26 | |
a44325f9 LF |
27 | #include "rtllib.h" |
28 | ||
94a79942 | 29 | struct rtllib_tkip_data { |
ecdfa446 GKH |
30 | #define TKIP_KEY_LEN 32 |
31 | u8 key[TKIP_KEY_LEN]; | |
32 | int key_set; | |
33 | ||
34 | u32 tx_iv32; | |
35 | u16 tx_iv16; | |
36 | u16 tx_ttak[5]; | |
37 | int tx_phase1_done; | |
38 | ||
39 | u32 rx_iv32; | |
40 | u16 rx_iv16; | |
a44325f9 | 41 | bool initialized; |
ecdfa446 GKH |
42 | u16 rx_ttak[5]; |
43 | int rx_phase1_done; | |
44 | u32 rx_iv32_new; | |
45 | u16 rx_iv16_new; | |
46 | ||
47 | u32 dot11RSNAStatsTKIPReplays; | |
48 | u32 dot11RSNAStatsTKIPICVErrors; | |
49 | u32 dot11RSNAStatsTKIPLocalMICFailures; | |
50 | ||
51 | int key_idx; | |
a1d38394 HX |
52 | struct crypto_skcipher *rx_tfm_arc4; |
53 | struct crypto_ahash *rx_tfm_michael; | |
54 | struct crypto_skcipher *tx_tfm_arc4; | |
55 | struct crypto_ahash *tx_tfm_michael; | |
ecdfa446 | 56 | /* scratch buffers for virt_to_page() (crypto API) */ |
06c11107 MK |
57 | u8 rx_hdr[16]; |
58 | u8 tx_hdr[16]; | |
ecdfa446 GKH |
59 | }; |
60 | ||
a44325f9 | 61 | static void *rtllib_tkip_init(int key_idx) |
ecdfa446 | 62 | { |
94a79942 | 63 | struct rtllib_tkip_data *priv; |
ecdfa446 | 64 | |
929fa2a4 | 65 | priv = kzalloc(sizeof(*priv), GFP_ATOMIC); |
ecdfa446 GKH |
66 | if (priv == NULL) |
67 | goto fail; | |
ecdfa446 | 68 | priv->key_idx = key_idx; |
a1d38394 HX |
69 | priv->tx_tfm_arc4 = crypto_alloc_skcipher("ecb(arc4)", 0, |
70 | CRYPTO_ALG_ASYNC); | |
ecdfa446 | 71 | if (IS_ERR(priv->tx_tfm_arc4)) { |
7bdfaa0a | 72 | pr_debug("Could not allocate crypto API arc4\n"); |
ecdfa446 GKH |
73 | priv->tx_tfm_arc4 = NULL; |
74 | goto fail; | |
75 | } | |
76 | ||
a1d38394 HX |
77 | priv->tx_tfm_michael = crypto_alloc_ahash("michael_mic", 0, |
78 | CRYPTO_ALG_ASYNC); | |
ecdfa446 | 79 | if (IS_ERR(priv->tx_tfm_michael)) { |
7bdfaa0a | 80 | pr_debug("Could not allocate crypto API michael_mic\n"); |
ecdfa446 GKH |
81 | priv->tx_tfm_michael = NULL; |
82 | goto fail; | |
83 | } | |
84 | ||
a1d38394 HX |
85 | priv->rx_tfm_arc4 = crypto_alloc_skcipher("ecb(arc4)", 0, |
86 | CRYPTO_ALG_ASYNC); | |
ecdfa446 | 87 | if (IS_ERR(priv->rx_tfm_arc4)) { |
7bdfaa0a | 88 | pr_debug("Could not allocate crypto API arc4\n"); |
ecdfa446 GKH |
89 | priv->rx_tfm_arc4 = NULL; |
90 | goto fail; | |
91 | } | |
92 | ||
a1d38394 HX |
93 | priv->rx_tfm_michael = crypto_alloc_ahash("michael_mic", 0, |
94 | CRYPTO_ALG_ASYNC); | |
ecdfa446 | 95 | if (IS_ERR(priv->rx_tfm_michael)) { |
7bdfaa0a | 96 | pr_debug("Could not allocate crypto API michael_mic\n"); |
ecdfa446 GKH |
97 | priv->rx_tfm_michael = NULL; |
98 | goto fail; | |
99 | } | |
ecdfa446 GKH |
100 | return priv; |
101 | ||
102 | fail: | |
103 | if (priv) { | |
a1d38394 HX |
104 | crypto_free_ahash(priv->tx_tfm_michael); |
105 | crypto_free_skcipher(priv->tx_tfm_arc4); | |
106 | crypto_free_ahash(priv->rx_tfm_michael); | |
107 | crypto_free_skcipher(priv->rx_tfm_arc4); | |
ecdfa446 GKH |
108 | kfree(priv); |
109 | } | |
110 | ||
111 | return NULL; | |
112 | } | |
113 | ||
114 | ||
94a79942 | 115 | static void rtllib_tkip_deinit(void *priv) |
ecdfa446 | 116 | { |
94a79942 | 117 | struct rtllib_tkip_data *_priv = priv; |
cb762154 | 118 | |
ecdfa446 | 119 | if (_priv) { |
a1d38394 HX |
120 | crypto_free_ahash(_priv->tx_tfm_michael); |
121 | crypto_free_skcipher(_priv->tx_tfm_arc4); | |
122 | crypto_free_ahash(_priv->rx_tfm_michael); | |
123 | crypto_free_skcipher(_priv->rx_tfm_arc4); | |
ecdfa446 | 124 | } |
ecdfa446 GKH |
125 | kfree(priv); |
126 | } | |
127 | ||
128 | ||
129 | static inline u16 RotR1(u16 val) | |
130 | { | |
131 | return (val >> 1) | (val << 15); | |
132 | } | |
133 | ||
134 | ||
135 | static inline u8 Lo8(u16 val) | |
136 | { | |
137 | return val & 0xff; | |
138 | } | |
139 | ||
140 | ||
141 | static inline u8 Hi8(u16 val) | |
142 | { | |
143 | return val >> 8; | |
144 | } | |
145 | ||
146 | ||
147 | static inline u16 Lo16(u32 val) | |
148 | { | |
149 | return val & 0xffff; | |
150 | } | |
151 | ||
152 | ||
153 | static inline u16 Hi16(u32 val) | |
154 | { | |
155 | return val >> 16; | |
156 | } | |
157 | ||
158 | ||
159 | static inline u16 Mk16(u8 hi, u8 lo) | |
160 | { | |
161 | return lo | (((u16) hi) << 8); | |
162 | } | |
163 | ||
164 | ||
165 | static inline u16 Mk16_le(u16 *v) | |
166 | { | |
99277c1f | 167 | return *v; |
ecdfa446 GKH |
168 | } |
169 | ||
170 | ||
a44325f9 | 171 | static const u16 Sbox[256] = { |
ecdfa446 GKH |
172 | 0xC6A5, 0xF884, 0xEE99, 0xF68D, 0xFF0D, 0xD6BD, 0xDEB1, 0x9154, |
173 | 0x6050, 0x0203, 0xCEA9, 0x567D, 0xE719, 0xB562, 0x4DE6, 0xEC9A, | |
174 | 0x8F45, 0x1F9D, 0x8940, 0xFA87, 0xEF15, 0xB2EB, 0x8EC9, 0xFB0B, | |
175 | 0x41EC, 0xB367, 0x5FFD, 0x45EA, 0x23BF, 0x53F7, 0xE496, 0x9B5B, | |
176 | 0x75C2, 0xE11C, 0x3DAE, 0x4C6A, 0x6C5A, 0x7E41, 0xF502, 0x834F, | |
177 | 0x685C, 0x51F4, 0xD134, 0xF908, 0xE293, 0xAB73, 0x6253, 0x2A3F, | |
178 | 0x080C, 0x9552, 0x4665, 0x9D5E, 0x3028, 0x37A1, 0x0A0F, 0x2FB5, | |
179 | 0x0E09, 0x2436, 0x1B9B, 0xDF3D, 0xCD26, 0x4E69, 0x7FCD, 0xEA9F, | |
180 | 0x121B, 0x1D9E, 0x5874, 0x342E, 0x362D, 0xDCB2, 0xB4EE, 0x5BFB, | |
181 | 0xA4F6, 0x764D, 0xB761, 0x7DCE, 0x527B, 0xDD3E, 0x5E71, 0x1397, | |
182 | 0xA6F5, 0xB968, 0x0000, 0xC12C, 0x4060, 0xE31F, 0x79C8, 0xB6ED, | |
183 | 0xD4BE, 0x8D46, 0x67D9, 0x724B, 0x94DE, 0x98D4, 0xB0E8, 0x854A, | |
184 | 0xBB6B, 0xC52A, 0x4FE5, 0xED16, 0x86C5, 0x9AD7, 0x6655, 0x1194, | |
185 | 0x8ACF, 0xE910, 0x0406, 0xFE81, 0xA0F0, 0x7844, 0x25BA, 0x4BE3, | |
186 | 0xA2F3, 0x5DFE, 0x80C0, 0x058A, 0x3FAD, 0x21BC, 0x7048, 0xF104, | |
187 | 0x63DF, 0x77C1, 0xAF75, 0x4263, 0x2030, 0xE51A, 0xFD0E, 0xBF6D, | |
188 | 0x814C, 0x1814, 0x2635, 0xC32F, 0xBEE1, 0x35A2, 0x88CC, 0x2E39, | |
189 | 0x9357, 0x55F2, 0xFC82, 0x7A47, 0xC8AC, 0xBAE7, 0x322B, 0xE695, | |
190 | 0xC0A0, 0x1998, 0x9ED1, 0xA37F, 0x4466, 0x547E, 0x3BAB, 0x0B83, | |
191 | 0x8CCA, 0xC729, 0x6BD3, 0x283C, 0xA779, 0xBCE2, 0x161D, 0xAD76, | |
192 | 0xDB3B, 0x6456, 0x744E, 0x141E, 0x92DB, 0x0C0A, 0x486C, 0xB8E4, | |
193 | 0x9F5D, 0xBD6E, 0x43EF, 0xC4A6, 0x39A8, 0x31A4, 0xD337, 0xF28B, | |
194 | 0xD532, 0x8B43, 0x6E59, 0xDAB7, 0x018C, 0xB164, 0x9CD2, 0x49E0, | |
195 | 0xD8B4, 0xACFA, 0xF307, 0xCF25, 0xCAAF, 0xF48E, 0x47E9, 0x1018, | |
196 | 0x6FD5, 0xF088, 0x4A6F, 0x5C72, 0x3824, 0x57F1, 0x73C7, 0x9751, | |
197 | 0xCB23, 0xA17C, 0xE89C, 0x3E21, 0x96DD, 0x61DC, 0x0D86, 0x0F85, | |
198 | 0xE090, 0x7C42, 0x71C4, 0xCCAA, 0x90D8, 0x0605, 0xF701, 0x1C12, | |
199 | 0xC2A3, 0x6A5F, 0xAEF9, 0x69D0, 0x1791, 0x9958, 0x3A27, 0x27B9, | |
200 | 0xD938, 0xEB13, 0x2BB3, 0x2233, 0xD2BB, 0xA970, 0x0789, 0x33A7, | |
201 | 0x2DB6, 0x3C22, 0x1592, 0xC920, 0x8749, 0xAAFF, 0x5078, 0xA57A, | |
202 | 0x038F, 0x59F8, 0x0980, 0x1A17, 0x65DA, 0xD731, 0x84C6, 0xD0B8, | |
203 | 0x82C3, 0x29B0, 0x5A77, 0x1E11, 0x7BCB, 0xA8FC, 0x6DD6, 0x2C3A, | |
204 | }; | |
205 | ||
206 | ||
207 | static inline u16 _S_(u16 v) | |
208 | { | |
209 | u16 t = Sbox[Hi8(v)]; | |
210 | return Sbox[Lo8(v)] ^ ((t << 8) | (t >> 8)); | |
211 | } | |
212 | ||
213 | ||
214 | #define PHASE1_LOOP_COUNT 8 | |
215 | ||
216 | ||
217 | static void tkip_mixing_phase1(u16 *TTAK, const u8 *TK, const u8 *TA, u32 IV32) | |
218 | { | |
219 | int i, j; | |
220 | ||
221 | /* Initialize the 80-bit TTAK from TSC (IV32) and TA[0..5] */ | |
222 | TTAK[0] = Lo16(IV32); | |
223 | TTAK[1] = Hi16(IV32); | |
224 | TTAK[2] = Mk16(TA[1], TA[0]); | |
225 | TTAK[3] = Mk16(TA[3], TA[2]); | |
226 | TTAK[4] = Mk16(TA[5], TA[4]); | |
227 | ||
228 | for (i = 0; i < PHASE1_LOOP_COUNT; i++) { | |
229 | j = 2 * (i & 1); | |
230 | TTAK[0] += _S_(TTAK[4] ^ Mk16(TK[1 + j], TK[0 + j])); | |
231 | TTAK[1] += _S_(TTAK[0] ^ Mk16(TK[5 + j], TK[4 + j])); | |
232 | TTAK[2] += _S_(TTAK[1] ^ Mk16(TK[9 + j], TK[8 + j])); | |
233 | TTAK[3] += _S_(TTAK[2] ^ Mk16(TK[13 + j], TK[12 + j])); | |
234 | TTAK[4] += _S_(TTAK[3] ^ Mk16(TK[1 + j], TK[0 + j])) + i; | |
235 | } | |
236 | } | |
237 | ||
238 | ||
239 | static void tkip_mixing_phase2(u8 *WEPSeed, const u8 *TK, const u16 *TTAK, | |
240 | u16 IV16) | |
241 | { | |
242 | /* Make temporary area overlap WEP seed so that the final copy can be | |
14b40d92 MK |
243 | * avoided on little endian hosts. |
244 | */ | |
ecdfa446 GKH |
245 | u16 *PPK = (u16 *) &WEPSeed[4]; |
246 | ||
247 | /* Step 1 - make copy of TTAK and bring in TSC */ | |
248 | PPK[0] = TTAK[0]; | |
249 | PPK[1] = TTAK[1]; | |
250 | PPK[2] = TTAK[2]; | |
251 | PPK[3] = TTAK[3]; | |
252 | PPK[4] = TTAK[4]; | |
253 | PPK[5] = TTAK[4] + IV16; | |
254 | ||
255 | /* Step 2 - 96-bit bijective mixing using S-box */ | |
256 | PPK[0] += _S_(PPK[5] ^ Mk16_le((u16 *) &TK[0])); | |
257 | PPK[1] += _S_(PPK[0] ^ Mk16_le((u16 *) &TK[2])); | |
258 | PPK[2] += _S_(PPK[1] ^ Mk16_le((u16 *) &TK[4])); | |
259 | PPK[3] += _S_(PPK[2] ^ Mk16_le((u16 *) &TK[6])); | |
260 | PPK[4] += _S_(PPK[3] ^ Mk16_le((u16 *) &TK[8])); | |
261 | PPK[5] += _S_(PPK[4] ^ Mk16_le((u16 *) &TK[10])); | |
262 | ||
263 | PPK[0] += RotR1(PPK[5] ^ Mk16_le((u16 *) &TK[12])); | |
264 | PPK[1] += RotR1(PPK[0] ^ Mk16_le((u16 *) &TK[14])); | |
265 | PPK[2] += RotR1(PPK[1]); | |
266 | PPK[3] += RotR1(PPK[2]); | |
267 | PPK[4] += RotR1(PPK[3]); | |
268 | PPK[5] += RotR1(PPK[4]); | |
269 | ||
270 | /* Step 3 - bring in last of TK bits, assign 24-bit WEP IV value | |
14b40d92 MK |
271 | * WEPSeed[0..2] is transmitted as WEP IV |
272 | */ | |
ecdfa446 GKH |
273 | WEPSeed[0] = Hi8(IV16); |
274 | WEPSeed[1] = (Hi8(IV16) | 0x20) & 0x7F; | |
275 | WEPSeed[2] = Lo8(IV16); | |
276 | WEPSeed[3] = Lo8((PPK[5] ^ Mk16_le((u16 *) &TK[0])) >> 1); | |
277 | ||
278 | #ifdef __BIG_ENDIAN | |
279 | { | |
280 | int i; | |
3a6b70c3 | 281 | |
ecdfa446 GKH |
282 | for (i = 0; i < 6; i++) |
283 | PPK[i] = (PPK[i] << 8) | (PPK[i] >> 8); | |
284 | } | |
285 | #endif | |
286 | } | |
287 | ||
288 | ||
94a79942 | 289 | static int rtllib_tkip_encrypt(struct sk_buff *skb, int hdr_len, void *priv) |
ecdfa446 | 290 | { |
94a79942 | 291 | struct rtllib_tkip_data *tkey = priv; |
ecdfa446 GKH |
292 | int len; |
293 | u8 *pos; | |
94a79942 | 294 | struct rtllib_hdr_4addr *hdr; |
a44325f9 LF |
295 | struct cb_desc *tcb_desc = (struct cb_desc *)(skb->cb + |
296 | MAX_DEV_ADDR_SIZE); | |
ecdfa446 | 297 | int ret = 0; |
ecdfa446 GKH |
298 | u8 rc4key[16], *icv; |
299 | u32 crc; | |
300 | struct scatterlist sg; | |
301 | ||
302 | if (skb_headroom(skb) < 8 || skb_tailroom(skb) < 4 || | |
303 | skb->len < hdr_len) | |
304 | return -1; | |
305 | ||
94a79942 | 306 | hdr = (struct rtllib_hdr_4addr *) skb->data; |
ecdfa446 | 307 | |
94a79942 | 308 | if (!tcb_desc->bHwSec) { |
ecdfa446 GKH |
309 | if (!tkey->tx_phase1_done) { |
310 | tkip_mixing_phase1(tkey->tx_ttak, tkey->key, hdr->addr2, | |
311 | tkey->tx_iv32); | |
312 | tkey->tx_phase1_done = 1; | |
313 | } | |
a44325f9 LF |
314 | tkip_mixing_phase2(rc4key, tkey->key, tkey->tx_ttak, |
315 | tkey->tx_iv16); | |
94a79942 | 316 | } else |
ecdfa446 GKH |
317 | tkey->tx_phase1_done = 1; |
318 | ||
319 | ||
320 | len = skb->len - hdr_len; | |
321 | pos = skb_push(skb, 8); | |
322 | memmove(pos, pos + 8, hdr_len); | |
323 | pos += hdr_len; | |
324 | ||
94a79942 | 325 | if (tcb_desc->bHwSec) { |
ecdfa446 GKH |
326 | *pos++ = Hi8(tkey->tx_iv16); |
327 | *pos++ = (Hi8(tkey->tx_iv16) | 0x20) & 0x7F; | |
328 | *pos++ = Lo8(tkey->tx_iv16); | |
94a79942 | 329 | } else { |
ecdfa446 GKH |
330 | *pos++ = rc4key[0]; |
331 | *pos++ = rc4key[1]; | |
332 | *pos++ = rc4key[2]; | |
333 | } | |
334 | ||
335 | *pos++ = (tkey->key_idx << 6) | (1 << 5) /* Ext IV included */; | |
336 | *pos++ = tkey->tx_iv32 & 0xff; | |
337 | *pos++ = (tkey->tx_iv32 >> 8) & 0xff; | |
338 | *pos++ = (tkey->tx_iv32 >> 16) & 0xff; | |
339 | *pos++ = (tkey->tx_iv32 >> 24) & 0xff; | |
340 | ||
94a79942 | 341 | if (!tcb_desc->bHwSec) { |
a1d38394 HX |
342 | SKCIPHER_REQUEST_ON_STACK(req, tkey->tx_tfm_arc4); |
343 | ||
ecdfa446 | 344 | icv = skb_put(skb, 4); |
ecdfa446 | 345 | crc = ~crc32_le(~0, pos, len); |
ecdfa446 GKH |
346 | icv[0] = crc; |
347 | icv[1] = crc >> 8; | |
348 | icv[2] = crc >> 16; | |
349 | icv[3] = crc >> 24; | |
94a79942 | 350 | |
ecdfa446 | 351 | sg_init_one(&sg, pos, len+4); |
94a79942 LF |
352 | |
353 | ||
a1d38394 HX |
354 | crypto_skcipher_setkey(tkey->tx_tfm_arc4, rc4key, 16); |
355 | skcipher_request_set_tfm(req, tkey->tx_tfm_arc4); | |
356 | skcipher_request_set_callback(req, 0, NULL, NULL); | |
357 | skcipher_request_set_crypt(req, &sg, &sg, len + 4, NULL); | |
358 | ret = crypto_skcipher_encrypt(req); | |
359 | skcipher_request_zero(req); | |
ecdfa446 GKH |
360 | } |
361 | ||
362 | tkey->tx_iv16++; | |
363 | if (tkey->tx_iv16 == 0) { | |
364 | tkey->tx_phase1_done = 0; | |
365 | tkey->tx_iv32++; | |
366 | } | |
367 | ||
368 | if (!tcb_desc->bHwSec) | |
ecdfa446 | 369 | return ret; |
76134b3f | 370 | return 0; |
ecdfa446 GKH |
371 | |
372 | ||
373 | } | |
374 | ||
94a79942 | 375 | static int rtllib_tkip_decrypt(struct sk_buff *skb, int hdr_len, void *priv) |
ecdfa446 | 376 | { |
94a79942 | 377 | struct rtllib_tkip_data *tkey = priv; |
ecdfa446 GKH |
378 | u8 keyidx, *pos; |
379 | u32 iv32; | |
380 | u16 iv16; | |
94a79942 | 381 | struct rtllib_hdr_4addr *hdr; |
a44325f9 LF |
382 | struct cb_desc *tcb_desc = (struct cb_desc *)(skb->cb + |
383 | MAX_DEV_ADDR_SIZE); | |
ecdfa446 GKH |
384 | u8 rc4key[16]; |
385 | u8 icv[4]; | |
386 | u32 crc; | |
387 | struct scatterlist sg; | |
388 | int plen; | |
a1d38394 | 389 | int err; |
3a6b70c3 | 390 | |
ecdfa446 GKH |
391 | if (skb->len < hdr_len + 8 + 4) |
392 | return -1; | |
393 | ||
94a79942 | 394 | hdr = (struct rtllib_hdr_4addr *) skb->data; |
ecdfa446 GKH |
395 | pos = skb->data + hdr_len; |
396 | keyidx = pos[3]; | |
397 | if (!(keyidx & (1 << 5))) { | |
398 | if (net_ratelimit()) { | |
7bdfaa0a MK |
399 | netdev_dbg(skb->dev, |
400 | "Received packet without ExtIV flag from %pM\n", | |
401 | hdr->addr2); | |
ecdfa446 GKH |
402 | } |
403 | return -2; | |
404 | } | |
405 | keyidx >>= 6; | |
406 | if (tkey->key_idx != keyidx) { | |
7bdfaa0a MK |
407 | netdev_dbg(skb->dev, |
408 | "RX tkey->key_idx=%d frame keyidx=%d priv=%p\n", | |
409 | tkey->key_idx, keyidx, priv); | |
ecdfa446 GKH |
410 | return -6; |
411 | } | |
412 | if (!tkey->key_set) { | |
413 | if (net_ratelimit()) { | |
7bdfaa0a MK |
414 | netdev_dbg(skb->dev, |
415 | "Received packet from %pM with keyid=%d that does not have a configured key\n", | |
416 | hdr->addr2, keyidx); | |
ecdfa446 GKH |
417 | } |
418 | return -3; | |
419 | } | |
420 | iv16 = (pos[0] << 8) | pos[2]; | |
421 | iv32 = pos[4] | (pos[5] << 8) | (pos[6] << 16) | (pos[7] << 24); | |
422 | pos += 8; | |
423 | ||
a44325f9 | 424 | if (!tcb_desc->bHwSec || (skb->cb[0] == 1)) { |
a1d38394 HX |
425 | SKCIPHER_REQUEST_ON_STACK(req, tkey->rx_tfm_arc4); |
426 | ||
94a79942 | 427 | if ((iv32 < tkey->rx_iv32 || |
a44325f9 LF |
428 | (iv32 == tkey->rx_iv32 && iv16 <= tkey->rx_iv16)) && |
429 | tkey->initialized) { | |
ecdfa446 | 430 | if (net_ratelimit()) { |
7bdfaa0a MK |
431 | netdev_dbg(skb->dev, |
432 | "Replay detected: STA= %pM previous TSC %08x%04x received TSC %08x%04x\n", | |
433 | hdr->addr2, tkey->rx_iv32, | |
434 | tkey->rx_iv16, iv32, iv16); | |
ecdfa446 GKH |
435 | } |
436 | tkey->dot11RSNAStatsTKIPReplays++; | |
437 | return -4; | |
438 | } | |
a44325f9 | 439 | tkey->initialized = true; |
ecdfa446 GKH |
440 | |
441 | if (iv32 != tkey->rx_iv32 || !tkey->rx_phase1_done) { | |
a44325f9 LF |
442 | tkip_mixing_phase1(tkey->rx_ttak, tkey->key, |
443 | hdr->addr2, iv32); | |
ecdfa446 GKH |
444 | tkey->rx_phase1_done = 1; |
445 | } | |
446 | tkip_mixing_phase2(rc4key, tkey->key, tkey->rx_ttak, iv16); | |
447 | ||
448 | plen = skb->len - hdr_len - 12; | |
449 | ||
ecdfa446 | 450 | sg_init_one(&sg, pos, plen+4); |
94a79942 | 451 | |
a1d38394 HX |
452 | crypto_skcipher_setkey(tkey->rx_tfm_arc4, rc4key, 16); |
453 | skcipher_request_set_tfm(req, tkey->rx_tfm_arc4); | |
454 | skcipher_request_set_callback(req, 0, NULL, NULL); | |
455 | skcipher_request_set_crypt(req, &sg, &sg, plen + 4, NULL); | |
456 | err = crypto_skcipher_decrypt(req); | |
457 | skcipher_request_zero(req); | |
458 | if (err) { | |
ecdfa446 | 459 | if (net_ratelimit()) { |
7bdfaa0a MK |
460 | netdev_dbg(skb->dev, |
461 | "Failed to decrypt received packet from %pM\n", | |
462 | hdr->addr2); | |
ecdfa446 GKH |
463 | } |
464 | return -7; | |
465 | } | |
ecdfa446 | 466 | |
ecdfa446 | 467 | crc = ~crc32_le(~0, pos, plen); |
ecdfa446 GKH |
468 | icv[0] = crc; |
469 | icv[1] = crc >> 8; | |
470 | icv[2] = crc >> 16; | |
471 | icv[3] = crc >> 24; | |
472 | ||
473 | if (memcmp(icv, pos + plen, 4) != 0) { | |
474 | if (iv32 != tkey->rx_iv32) { | |
a44325f9 LF |
475 | /* Previously cached Phase1 result was already |
476 | * lost, so it needs to be recalculated for the | |
14b40d92 MK |
477 | * next packet. |
478 | */ | |
ecdfa446 GKH |
479 | tkey->rx_phase1_done = 0; |
480 | } | |
481 | if (net_ratelimit()) { | |
7bdfaa0a MK |
482 | netdev_dbg(skb->dev, |
483 | "ICV error detected: STA= %pM\n", | |
484 | hdr->addr2); | |
ecdfa446 GKH |
485 | } |
486 | tkey->dot11RSNAStatsTKIPICVErrors++; | |
487 | return -5; | |
488 | } | |
489 | ||
490 | } | |
491 | ||
492 | /* Update real counters only after Michael MIC verification has | |
14b40d92 MK |
493 | * completed |
494 | */ | |
ecdfa446 GKH |
495 | tkey->rx_iv32_new = iv32; |
496 | tkey->rx_iv16_new = iv16; | |
497 | ||
498 | /* Remove IV and ICV */ | |
499 | memmove(skb->data + 8, skb->data, hdr_len); | |
500 | skb_pull(skb, 8); | |
501 | skb_trim(skb, skb->len - 4); | |
502 | ||
ecdfa446 GKH |
503 | return keyidx; |
504 | } | |
505 | ||
506 | ||
a1d38394 | 507 | static int michael_mic(struct crypto_ahash *tfm_michael, u8 *key, u8 *hdr, |
a44325f9 | 508 | u8 *data, size_t data_len, u8 *mic) |
ecdfa446 | 509 | { |
a1d38394 | 510 | AHASH_REQUEST_ON_STACK(req, tfm_michael); |
a44325f9 | 511 | struct scatterlist sg[2]; |
a1d38394 | 512 | int err; |
a44325f9 LF |
513 | |
514 | if (tfm_michael == NULL) { | |
d69d2054 | 515 | pr_warn("michael_mic: tfm_michael == NULL\n"); |
a44325f9 LF |
516 | return -1; |
517 | } | |
518 | sg_init_table(sg, 2); | |
519 | sg_set_buf(&sg[0], hdr, 16); | |
520 | sg_set_buf(&sg[1], data, data_len); | |
521 | ||
a1d38394 | 522 | if (crypto_ahash_setkey(tfm_michael, key, 8)) |
a44325f9 LF |
523 | return -1; |
524 | ||
a1d38394 HX |
525 | ahash_request_set_tfm(req, tfm_michael); |
526 | ahash_request_set_callback(req, 0, NULL, NULL); | |
527 | ahash_request_set_crypt(req, sg, mic, data_len + 16); | |
528 | err = crypto_ahash_digest(req); | |
529 | ahash_request_zero(req); | |
530 | return err; | |
ecdfa446 | 531 | } |
ecdfa446 GKH |
532 | |
533 | static void michael_mic_hdr(struct sk_buff *skb, u8 *hdr) | |
534 | { | |
94a79942 | 535 | struct rtllib_hdr_4addr *hdr11; |
ecdfa446 | 536 | |
94a79942 | 537 | hdr11 = (struct rtllib_hdr_4addr *) skb->data; |
ecdfa446 | 538 | switch (le16_to_cpu(hdr11->frame_ctl) & |
94a79942 LF |
539 | (RTLLIB_FCTL_FROMDS | RTLLIB_FCTL_TODS)) { |
540 | case RTLLIB_FCTL_TODS: | |
b57ceb19 MK |
541 | ether_addr_copy(hdr, hdr11->addr3); /* DA */ |
542 | ether_addr_copy(hdr + ETH_ALEN, hdr11->addr2); /* SA */ | |
ecdfa446 | 543 | break; |
94a79942 | 544 | case RTLLIB_FCTL_FROMDS: |
b57ceb19 MK |
545 | ether_addr_copy(hdr, hdr11->addr1); /* DA */ |
546 | ether_addr_copy(hdr + ETH_ALEN, hdr11->addr3); /* SA */ | |
ecdfa446 | 547 | break; |
94a79942 | 548 | case RTLLIB_FCTL_FROMDS | RTLLIB_FCTL_TODS: |
b57ceb19 MK |
549 | ether_addr_copy(hdr, hdr11->addr3); /* DA */ |
550 | ether_addr_copy(hdr + ETH_ALEN, hdr11->addr4); /* SA */ | |
ecdfa446 GKH |
551 | break; |
552 | case 0: | |
b57ceb19 MK |
553 | ether_addr_copy(hdr, hdr11->addr1); /* DA */ |
554 | ether_addr_copy(hdr + ETH_ALEN, hdr11->addr2); /* SA */ | |
ecdfa446 GKH |
555 | break; |
556 | } | |
557 | ||
558 | hdr[12] = 0; /* priority */ | |
559 | ||
560 | hdr[13] = hdr[14] = hdr[15] = 0; /* reserved */ | |
561 | } | |
562 | ||
563 | ||
94a79942 | 564 | static int rtllib_michael_mic_add(struct sk_buff *skb, int hdr_len, void *priv) |
ecdfa446 | 565 | { |
94a79942 | 566 | struct rtllib_tkip_data *tkey = priv; |
ecdfa446 | 567 | u8 *pos; |
94a79942 | 568 | struct rtllib_hdr_4addr *hdr; |
ecdfa446 | 569 | |
94a79942 | 570 | hdr = (struct rtllib_hdr_4addr *) skb->data; |
ecdfa446 GKH |
571 | |
572 | if (skb_tailroom(skb) < 8 || skb->len < hdr_len) { | |
7bdfaa0a MK |
573 | netdev_dbg(skb->dev, |
574 | "Invalid packet for Michael MIC add (tailroom=%d hdr_len=%d skb->len=%d)\n", | |
575 | skb_tailroom(skb), hdr_len, skb->len); | |
ecdfa446 GKH |
576 | return -1; |
577 | } | |
578 | ||
579 | michael_mic_hdr(skb, tkey->tx_hdr); | |
580 | ||
a44325f9 | 581 | if (RTLLIB_QOS_HAS_SEQ(le16_to_cpu(hdr->frame_ctl))) |
ecdfa446 | 582 | tkey->tx_hdr[12] = *(skb->data + hdr_len - 2) & 0x07; |
ecdfa446 | 583 | pos = skb_put(skb, 8); |
ecdfa446 | 584 | if (michael_mic(tkey->tx_tfm_michael, &tkey->key[16], tkey->tx_hdr, |
a44325f9 | 585 | skb->data + hdr_len, skb->len - 8 - hdr_len, pos)) |
ecdfa446 GKH |
586 | return -1; |
587 | ||
588 | return 0; | |
589 | } | |
590 | ||
591 | ||
94a79942 LF |
592 | static void rtllib_michael_mic_failure(struct net_device *dev, |
593 | struct rtllib_hdr_4addr *hdr, | |
ecdfa446 GKH |
594 | int keyidx) |
595 | { | |
596 | union iwreq_data wrqu; | |
597 | struct iw_michaelmicfailure ev; | |
598 | ||
599 | /* TODO: needed parameters: count, keyid, key type, TSC */ | |
600 | memset(&ev, 0, sizeof(ev)); | |
601 | ev.flags = keyidx & IW_MICFAILURE_KEY_ID; | |
602 | if (hdr->addr1[0] & 0x01) | |
603 | ev.flags |= IW_MICFAILURE_GROUP; | |
604 | else | |
605 | ev.flags |= IW_MICFAILURE_PAIRWISE; | |
606 | ev.src_addr.sa_family = ARPHRD_ETHER; | |
b57ceb19 | 607 | ether_addr_copy(ev.src_addr.sa_data, hdr->addr2); |
ecdfa446 GKH |
608 | memset(&wrqu, 0, sizeof(wrqu)); |
609 | wrqu.data.length = sizeof(ev); | |
610 | wireless_send_event(dev, IWEVMICHAELMICFAILURE, &wrqu, (char *) &ev); | |
611 | } | |
ecdfa446 | 612 | |
94a79942 | 613 | static int rtllib_michael_mic_verify(struct sk_buff *skb, int keyidx, |
32c44cb5 | 614 | int hdr_len, void *priv) |
ecdfa446 | 615 | { |
94a79942 | 616 | struct rtllib_tkip_data *tkey = priv; |
ecdfa446 | 617 | u8 mic[8]; |
94a79942 | 618 | struct rtllib_hdr_4addr *hdr; |
ecdfa446 | 619 | |
94a79942 | 620 | hdr = (struct rtllib_hdr_4addr *) skb->data; |
ecdfa446 GKH |
621 | |
622 | if (!tkey->key_set) | |
623 | return -1; | |
624 | ||
625 | michael_mic_hdr(skb, tkey->rx_hdr); | |
a44325f9 | 626 | if (RTLLIB_QOS_HAS_SEQ(le16_to_cpu(hdr->frame_ctl))) |
ecdfa446 | 627 | tkey->rx_hdr[12] = *(skb->data + hdr_len - 2) & 0x07; |
ecdfa446 | 628 | |
ecdfa446 | 629 | if (michael_mic(tkey->rx_tfm_michael, &tkey->key[24], tkey->rx_hdr, |
a44325f9 | 630 | skb->data + hdr_len, skb->len - 8 - hdr_len, mic)) |
94a79942 LF |
631 | return -1; |
632 | ||
32c44cb5 | 633 | if (memcmp(mic, skb->data + skb->len - 8, 8) != 0) { |
94a79942 | 634 | struct rtllib_hdr_4addr *hdr; |
3a6b70c3 | 635 | |
94a79942 | 636 | hdr = (struct rtllib_hdr_4addr *) skb->data; |
7bdfaa0a MK |
637 | netdev_dbg(skb->dev, |
638 | "Michael MIC verification failed for MSDU from %pM keyidx=%d\n", | |
639 | hdr->addr2, keyidx); | |
640 | netdev_dbg(skb->dev, "%d\n", | |
641 | memcmp(mic, skb->data + skb->len - 8, 8) != 0); | |
94a79942 | 642 | if (skb->dev) { |
d69d2054 | 643 | pr_info("skb->dev != NULL\n"); |
94a79942 | 644 | rtllib_michael_mic_failure(skb->dev, hdr, keyidx); |
a44325f9 | 645 | } |
ecdfa446 GKH |
646 | tkey->dot11RSNAStatsTKIPLocalMICFailures++; |
647 | return -1; | |
648 | } | |
649 | ||
650 | /* Update TSC counters for RX now that the packet verification has | |
14b40d92 MK |
651 | * completed. |
652 | */ | |
ecdfa446 GKH |
653 | tkey->rx_iv32 = tkey->rx_iv32_new; |
654 | tkey->rx_iv16 = tkey->rx_iv16_new; | |
655 | ||
656 | skb_trim(skb, skb->len - 8); | |
657 | ||
658 | return 0; | |
659 | } | |
660 | ||
661 | ||
94a79942 | 662 | static int rtllib_tkip_set_key(void *key, int len, u8 *seq, void *priv) |
ecdfa446 | 663 | { |
94a79942 | 664 | struct rtllib_tkip_data *tkey = priv; |
ecdfa446 | 665 | int keyidx; |
a1d38394 HX |
666 | struct crypto_ahash *tfm = tkey->tx_tfm_michael; |
667 | struct crypto_skcipher *tfm2 = tkey->tx_tfm_arc4; | |
668 | struct crypto_ahash *tfm3 = tkey->rx_tfm_michael; | |
669 | struct crypto_skcipher *tfm4 = tkey->rx_tfm_arc4; | |
ecdfa446 GKH |
670 | |
671 | keyidx = tkey->key_idx; | |
672 | memset(tkey, 0, sizeof(*tkey)); | |
673 | tkey->key_idx = keyidx; | |
ecdfa446 GKH |
674 | tkey->tx_tfm_michael = tfm; |
675 | tkey->tx_tfm_arc4 = tfm2; | |
676 | tkey->rx_tfm_michael = tfm3; | |
677 | tkey->rx_tfm_arc4 = tfm4; | |
ecdfa446 GKH |
678 | |
679 | if (len == TKIP_KEY_LEN) { | |
680 | memcpy(tkey->key, key, TKIP_KEY_LEN); | |
681 | tkey->key_set = 1; | |
682 | tkey->tx_iv16 = 1; /* TSC is initialized to 1 */ | |
683 | if (seq) { | |
684 | tkey->rx_iv32 = (seq[5] << 24) | (seq[4] << 16) | | |
685 | (seq[3] << 8) | seq[2]; | |
686 | tkey->rx_iv16 = (seq[1] << 8) | seq[0]; | |
687 | } | |
688 | } else if (len == 0) | |
689 | tkey->key_set = 0; | |
690 | else | |
691 | return -1; | |
692 | ||
693 | return 0; | |
694 | } | |
695 | ||
696 | ||
94a79942 | 697 | static int rtllib_tkip_get_key(void *key, int len, u8 *seq, void *priv) |
ecdfa446 | 698 | { |
94a79942 | 699 | struct rtllib_tkip_data *tkey = priv; |
ecdfa446 GKH |
700 | |
701 | if (len < TKIP_KEY_LEN) | |
702 | return -1; | |
703 | ||
704 | if (!tkey->key_set) | |
705 | return 0; | |
706 | memcpy(key, tkey->key, TKIP_KEY_LEN); | |
707 | ||
708 | if (seq) { | |
709 | /* Return the sequence number of the last transmitted frame. */ | |
710 | u16 iv16 = tkey->tx_iv16; | |
711 | u32 iv32 = tkey->tx_iv32; | |
3a6b70c3 | 712 | |
ecdfa446 GKH |
713 | if (iv16 == 0) |
714 | iv32--; | |
715 | iv16--; | |
716 | seq[0] = tkey->tx_iv16; | |
717 | seq[1] = tkey->tx_iv16 >> 8; | |
718 | seq[2] = tkey->tx_iv32; | |
719 | seq[3] = tkey->tx_iv32 >> 8; | |
720 | seq[4] = tkey->tx_iv32 >> 16; | |
721 | seq[5] = tkey->tx_iv32 >> 24; | |
722 | } | |
723 | ||
724 | return TKIP_KEY_LEN; | |
725 | } | |
726 | ||
727 | ||
6bbefe86 | 728 | static void rtllib_tkip_print_stats(struct seq_file *m, void *priv) |
ecdfa446 | 729 | { |
94a79942 | 730 | struct rtllib_tkip_data *tkip = priv; |
3a6b70c3 | 731 | |
6bbefe86 | 732 | seq_printf(m, |
0822339b | 733 | "key[%d] alg=TKIP key_set=%d tx_pn=%02x%02x%02x%02x%02x%02x rx_pn=%02x%02x%02x%02x%02x%02x replays=%d icv_errors=%d local_mic_failures=%d\n", |
6bbefe86 DH |
734 | tkip->key_idx, tkip->key_set, |
735 | (tkip->tx_iv32 >> 24) & 0xff, | |
736 | (tkip->tx_iv32 >> 16) & 0xff, | |
737 | (tkip->tx_iv32 >> 8) & 0xff, | |
738 | tkip->tx_iv32 & 0xff, | |
739 | (tkip->tx_iv16 >> 8) & 0xff, | |
740 | tkip->tx_iv16 & 0xff, | |
741 | (tkip->rx_iv32 >> 24) & 0xff, | |
742 | (tkip->rx_iv32 >> 16) & 0xff, | |
743 | (tkip->rx_iv32 >> 8) & 0xff, | |
744 | tkip->rx_iv32 & 0xff, | |
745 | (tkip->rx_iv16 >> 8) & 0xff, | |
746 | tkip->rx_iv16 & 0xff, | |
747 | tkip->dot11RSNAStatsTKIPReplays, | |
748 | tkip->dot11RSNAStatsTKIPICVErrors, | |
749 | tkip->dot11RSNAStatsTKIPLocalMICFailures); | |
ecdfa446 GKH |
750 | } |
751 | ||
32c44cb5 | 752 | static struct lib80211_crypto_ops rtllib_crypt_tkip = { |
3b148be0 | 753 | .name = "R-TKIP", |
94a79942 LF |
754 | .init = rtllib_tkip_init, |
755 | .deinit = rtllib_tkip_deinit, | |
756 | .encrypt_mpdu = rtllib_tkip_encrypt, | |
757 | .decrypt_mpdu = rtllib_tkip_decrypt, | |
758 | .encrypt_msdu = rtllib_michael_mic_add, | |
759 | .decrypt_msdu = rtllib_michael_mic_verify, | |
760 | .set_key = rtllib_tkip_set_key, | |
761 | .get_key = rtllib_tkip_get_key, | |
762 | .print_stats = rtllib_tkip_print_stats, | |
32c44cb5 SM |
763 | .extra_mpdu_prefix_len = 4 + 4, /* IV + ExtIV */ |
764 | .extra_mpdu_postfix_len = 4, /* ICV */ | |
765 | .extra_msdu_postfix_len = 8, /* MIC */ | |
a44325f9 | 766 | .owner = THIS_MODULE, |
ecdfa446 GKH |
767 | }; |
768 | ||
769 | ||
316de3ca | 770 | static int __init rtllib_crypto_tkip_init(void) |
ecdfa446 | 771 | { |
3b148be0 | 772 | return lib80211_register_crypto_ops(&rtllib_crypt_tkip); |
ecdfa446 GKH |
773 | } |
774 | ||
775 | ||
316de3ca | 776 | static void __exit rtllib_crypto_tkip_exit(void) |
ecdfa446 | 777 | { |
3b148be0 | 778 | lib80211_unregister_crypto_ops(&rtllib_crypt_tkip); |
ecdfa446 GKH |
779 | } |
780 | ||
d37e0208 SM |
781 | module_init(rtllib_crypto_tkip_init); |
782 | module_exit(rtllib_crypto_tkip_exit); | |
783 | ||
784 | MODULE_LICENSE("GPL"); |