]>
Commit | Line | Data |
---|---|---|
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 | ||
ecdfa446 GKH |
12 | #include <linux/module.h> |
13 | #include <linux/init.h> | |
14 | #include <linux/slab.h> | |
15 | #include <linux/random.h> | |
16 | #include <linux/skbuff.h> | |
17 | #include <linux/netdevice.h> | |
18 | #include <linux/if_ether.h> | |
19 | #include <linux/if_arp.h> | |
a44325f9 | 20 | #include <linux/string.h> |
ecdfa446 | 21 | #include <linux/crypto.h> |
cb762154 | 22 | #include <linux/scatterlist.h> |
ecdfa446 | 23 | #include <linux/crc32.h> |
b57ceb19 | 24 | #include <linux/etherdevice.h> |
ecdfa446 | 25 | |
a44325f9 LF |
26 | #include "rtllib.h" |
27 | ||
94a79942 | 28 | struct rtllib_tkip_data { |
ecdfa446 GKH |
29 | #define TKIP_KEY_LEN 32 |
30 | u8 key[TKIP_KEY_LEN]; | |
31 | int key_set; | |
32 | ||
33 | u32 tx_iv32; | |
34 | u16 tx_iv16; | |
35 | u16 tx_ttak[5]; | |
36 | int tx_phase1_done; | |
37 | ||
38 | u32 rx_iv32; | |
39 | u16 rx_iv16; | |
a44325f9 | 40 | bool initialized; |
ecdfa446 GKH |
41 | u16 rx_ttak[5]; |
42 | int rx_phase1_done; | |
43 | u32 rx_iv32_new; | |
44 | u16 rx_iv16_new; | |
45 | ||
46 | u32 dot11RSNAStatsTKIPReplays; | |
47 | u32 dot11RSNAStatsTKIPICVErrors; | |
48 | u32 dot11RSNAStatsTKIPLocalMICFailures; | |
49 | ||
50 | int key_idx; | |
ecdfa446 GKH |
51 | struct crypto_blkcipher *rx_tfm_arc4; |
52 | struct crypto_hash *rx_tfm_michael; | |
53 | struct crypto_blkcipher *tx_tfm_arc4; | |
54 | struct crypto_hash *tx_tfm_michael; | |
ecdfa446 | 55 | /* scratch buffers for virt_to_page() (crypto API) */ |
06c11107 MK |
56 | u8 rx_hdr[16]; |
57 | u8 tx_hdr[16]; | |
ecdfa446 GKH |
58 | }; |
59 | ||
a44325f9 | 60 | static void *rtllib_tkip_init(int key_idx) |
ecdfa446 | 61 | { |
94a79942 | 62 | struct rtllib_tkip_data *priv; |
ecdfa446 | 63 | |
929fa2a4 | 64 | priv = kzalloc(sizeof(*priv), GFP_ATOMIC); |
ecdfa446 GKH |
65 | if (priv == NULL) |
66 | goto fail; | |
ecdfa446 | 67 | priv->key_idx = key_idx; |
ecdfa446 GKH |
68 | priv->tx_tfm_arc4 = crypto_alloc_blkcipher("ecb(arc4)", 0, |
69 | CRYPTO_ALG_ASYNC); | |
70 | if (IS_ERR(priv->tx_tfm_arc4)) { | |
7bdfaa0a | 71 | pr_debug("Could not allocate crypto API arc4\n"); |
ecdfa446 GKH |
72 | priv->tx_tfm_arc4 = NULL; |
73 | goto fail; | |
74 | } | |
75 | ||
76 | priv->tx_tfm_michael = crypto_alloc_hash("michael_mic", 0, | |
77 | CRYPTO_ALG_ASYNC); | |
78 | if (IS_ERR(priv->tx_tfm_michael)) { | |
7bdfaa0a | 79 | pr_debug("Could not allocate crypto API michael_mic\n"); |
ecdfa446 GKH |
80 | priv->tx_tfm_michael = NULL; |
81 | goto fail; | |
82 | } | |
83 | ||
84 | priv->rx_tfm_arc4 = crypto_alloc_blkcipher("ecb(arc4)", 0, | |
85 | CRYPTO_ALG_ASYNC); | |
86 | if (IS_ERR(priv->rx_tfm_arc4)) { | |
7bdfaa0a | 87 | pr_debug("Could not allocate crypto API arc4\n"); |
ecdfa446 GKH |
88 | priv->rx_tfm_arc4 = NULL; |
89 | goto fail; | |
90 | } | |
91 | ||
92 | priv->rx_tfm_michael = crypto_alloc_hash("michael_mic", 0, | |
93 | CRYPTO_ALG_ASYNC); | |
94 | if (IS_ERR(priv->rx_tfm_michael)) { | |
7bdfaa0a | 95 | pr_debug("Could not allocate crypto API michael_mic\n"); |
ecdfa446 GKH |
96 | priv->rx_tfm_michael = NULL; |
97 | goto fail; | |
98 | } | |
ecdfa446 GKH |
99 | return priv; |
100 | ||
101 | fail: | |
102 | if (priv) { | |
ecdfa446 GKH |
103 | if (priv->tx_tfm_michael) |
104 | crypto_free_hash(priv->tx_tfm_michael); | |
105 | if (priv->tx_tfm_arc4) | |
106 | crypto_free_blkcipher(priv->tx_tfm_arc4); | |
107 | if (priv->rx_tfm_michael) | |
108 | crypto_free_hash(priv->rx_tfm_michael); | |
109 | if (priv->rx_tfm_arc4) | |
110 | crypto_free_blkcipher(priv->rx_tfm_arc4); | |
ecdfa446 GKH |
111 | kfree(priv); |
112 | } | |
113 | ||
114 | return NULL; | |
115 | } | |
116 | ||
117 | ||
94a79942 | 118 | static void rtllib_tkip_deinit(void *priv) |
ecdfa446 | 119 | { |
94a79942 | 120 | struct rtllib_tkip_data *_priv = priv; |
cb762154 | 121 | |
ecdfa446 GKH |
122 | if (_priv) { |
123 | if (_priv->tx_tfm_michael) | |
124 | crypto_free_hash(_priv->tx_tfm_michael); | |
125 | if (_priv->tx_tfm_arc4) | |
126 | crypto_free_blkcipher(_priv->tx_tfm_arc4); | |
127 | if (_priv->rx_tfm_michael) | |
128 | crypto_free_hash(_priv->rx_tfm_michael); | |
129 | if (_priv->rx_tfm_arc4) | |
130 | crypto_free_blkcipher(_priv->rx_tfm_arc4); | |
131 | } | |
ecdfa446 GKH |
132 | kfree(priv); |
133 | } | |
134 | ||
135 | ||
136 | static inline u16 RotR1(u16 val) | |
137 | { | |
138 | return (val >> 1) | (val << 15); | |
139 | } | |
140 | ||
141 | ||
142 | static inline u8 Lo8(u16 val) | |
143 | { | |
144 | return val & 0xff; | |
145 | } | |
146 | ||
147 | ||
148 | static inline u8 Hi8(u16 val) | |
149 | { | |
150 | return val >> 8; | |
151 | } | |
152 | ||
153 | ||
154 | static inline u16 Lo16(u32 val) | |
155 | { | |
156 | return val & 0xffff; | |
157 | } | |
158 | ||
159 | ||
160 | static inline u16 Hi16(u32 val) | |
161 | { | |
162 | return val >> 16; | |
163 | } | |
164 | ||
165 | ||
166 | static inline u16 Mk16(u8 hi, u8 lo) | |
167 | { | |
168 | return lo | (((u16) hi) << 8); | |
169 | } | |
170 | ||
171 | ||
172 | static inline u16 Mk16_le(u16 *v) | |
173 | { | |
99277c1f | 174 | return *v; |
ecdfa446 GKH |
175 | } |
176 | ||
177 | ||
a44325f9 | 178 | static const u16 Sbox[256] = { |
ecdfa446 GKH |
179 | 0xC6A5, 0xF884, 0xEE99, 0xF68D, 0xFF0D, 0xD6BD, 0xDEB1, 0x9154, |
180 | 0x6050, 0x0203, 0xCEA9, 0x567D, 0xE719, 0xB562, 0x4DE6, 0xEC9A, | |
181 | 0x8F45, 0x1F9D, 0x8940, 0xFA87, 0xEF15, 0xB2EB, 0x8EC9, 0xFB0B, | |
182 | 0x41EC, 0xB367, 0x5FFD, 0x45EA, 0x23BF, 0x53F7, 0xE496, 0x9B5B, | |
183 | 0x75C2, 0xE11C, 0x3DAE, 0x4C6A, 0x6C5A, 0x7E41, 0xF502, 0x834F, | |
184 | 0x685C, 0x51F4, 0xD134, 0xF908, 0xE293, 0xAB73, 0x6253, 0x2A3F, | |
185 | 0x080C, 0x9552, 0x4665, 0x9D5E, 0x3028, 0x37A1, 0x0A0F, 0x2FB5, | |
186 | 0x0E09, 0x2436, 0x1B9B, 0xDF3D, 0xCD26, 0x4E69, 0x7FCD, 0xEA9F, | |
187 | 0x121B, 0x1D9E, 0x5874, 0x342E, 0x362D, 0xDCB2, 0xB4EE, 0x5BFB, | |
188 | 0xA4F6, 0x764D, 0xB761, 0x7DCE, 0x527B, 0xDD3E, 0x5E71, 0x1397, | |
189 | 0xA6F5, 0xB968, 0x0000, 0xC12C, 0x4060, 0xE31F, 0x79C8, 0xB6ED, | |
190 | 0xD4BE, 0x8D46, 0x67D9, 0x724B, 0x94DE, 0x98D4, 0xB0E8, 0x854A, | |
191 | 0xBB6B, 0xC52A, 0x4FE5, 0xED16, 0x86C5, 0x9AD7, 0x6655, 0x1194, | |
192 | 0x8ACF, 0xE910, 0x0406, 0xFE81, 0xA0F0, 0x7844, 0x25BA, 0x4BE3, | |
193 | 0xA2F3, 0x5DFE, 0x80C0, 0x058A, 0x3FAD, 0x21BC, 0x7048, 0xF104, | |
194 | 0x63DF, 0x77C1, 0xAF75, 0x4263, 0x2030, 0xE51A, 0xFD0E, 0xBF6D, | |
195 | 0x814C, 0x1814, 0x2635, 0xC32F, 0xBEE1, 0x35A2, 0x88CC, 0x2E39, | |
196 | 0x9357, 0x55F2, 0xFC82, 0x7A47, 0xC8AC, 0xBAE7, 0x322B, 0xE695, | |
197 | 0xC0A0, 0x1998, 0x9ED1, 0xA37F, 0x4466, 0x547E, 0x3BAB, 0x0B83, | |
198 | 0x8CCA, 0xC729, 0x6BD3, 0x283C, 0xA779, 0xBCE2, 0x161D, 0xAD76, | |
199 | 0xDB3B, 0x6456, 0x744E, 0x141E, 0x92DB, 0x0C0A, 0x486C, 0xB8E4, | |
200 | 0x9F5D, 0xBD6E, 0x43EF, 0xC4A6, 0x39A8, 0x31A4, 0xD337, 0xF28B, | |
201 | 0xD532, 0x8B43, 0x6E59, 0xDAB7, 0x018C, 0xB164, 0x9CD2, 0x49E0, | |
202 | 0xD8B4, 0xACFA, 0xF307, 0xCF25, 0xCAAF, 0xF48E, 0x47E9, 0x1018, | |
203 | 0x6FD5, 0xF088, 0x4A6F, 0x5C72, 0x3824, 0x57F1, 0x73C7, 0x9751, | |
204 | 0xCB23, 0xA17C, 0xE89C, 0x3E21, 0x96DD, 0x61DC, 0x0D86, 0x0F85, | |
205 | 0xE090, 0x7C42, 0x71C4, 0xCCAA, 0x90D8, 0x0605, 0xF701, 0x1C12, | |
206 | 0xC2A3, 0x6A5F, 0xAEF9, 0x69D0, 0x1791, 0x9958, 0x3A27, 0x27B9, | |
207 | 0xD938, 0xEB13, 0x2BB3, 0x2233, 0xD2BB, 0xA970, 0x0789, 0x33A7, | |
208 | 0x2DB6, 0x3C22, 0x1592, 0xC920, 0x8749, 0xAAFF, 0x5078, 0xA57A, | |
209 | 0x038F, 0x59F8, 0x0980, 0x1A17, 0x65DA, 0xD731, 0x84C6, 0xD0B8, | |
210 | 0x82C3, 0x29B0, 0x5A77, 0x1E11, 0x7BCB, 0xA8FC, 0x6DD6, 0x2C3A, | |
211 | }; | |
212 | ||
213 | ||
214 | static inline u16 _S_(u16 v) | |
215 | { | |
216 | u16 t = Sbox[Hi8(v)]; | |
217 | return Sbox[Lo8(v)] ^ ((t << 8) | (t >> 8)); | |
218 | } | |
219 | ||
220 | ||
221 | #define PHASE1_LOOP_COUNT 8 | |
222 | ||
223 | ||
224 | static void tkip_mixing_phase1(u16 *TTAK, const u8 *TK, const u8 *TA, u32 IV32) | |
225 | { | |
226 | int i, j; | |
227 | ||
228 | /* Initialize the 80-bit TTAK from TSC (IV32) and TA[0..5] */ | |
229 | TTAK[0] = Lo16(IV32); | |
230 | TTAK[1] = Hi16(IV32); | |
231 | TTAK[2] = Mk16(TA[1], TA[0]); | |
232 | TTAK[3] = Mk16(TA[3], TA[2]); | |
233 | TTAK[4] = Mk16(TA[5], TA[4]); | |
234 | ||
235 | for (i = 0; i < PHASE1_LOOP_COUNT; i++) { | |
236 | j = 2 * (i & 1); | |
237 | TTAK[0] += _S_(TTAK[4] ^ Mk16(TK[1 + j], TK[0 + j])); | |
238 | TTAK[1] += _S_(TTAK[0] ^ Mk16(TK[5 + j], TK[4 + j])); | |
239 | TTAK[2] += _S_(TTAK[1] ^ Mk16(TK[9 + j], TK[8 + j])); | |
240 | TTAK[3] += _S_(TTAK[2] ^ Mk16(TK[13 + j], TK[12 + j])); | |
241 | TTAK[4] += _S_(TTAK[3] ^ Mk16(TK[1 + j], TK[0 + j])) + i; | |
242 | } | |
243 | } | |
244 | ||
245 | ||
246 | static void tkip_mixing_phase2(u8 *WEPSeed, const u8 *TK, const u16 *TTAK, | |
247 | u16 IV16) | |
248 | { | |
249 | /* Make temporary area overlap WEP seed so that the final copy can be | |
14b40d92 MK |
250 | * avoided on little endian hosts. |
251 | */ | |
ecdfa446 GKH |
252 | u16 *PPK = (u16 *) &WEPSeed[4]; |
253 | ||
254 | /* Step 1 - make copy of TTAK and bring in TSC */ | |
255 | PPK[0] = TTAK[0]; | |
256 | PPK[1] = TTAK[1]; | |
257 | PPK[2] = TTAK[2]; | |
258 | PPK[3] = TTAK[3]; | |
259 | PPK[4] = TTAK[4]; | |
260 | PPK[5] = TTAK[4] + IV16; | |
261 | ||
262 | /* Step 2 - 96-bit bijective mixing using S-box */ | |
263 | PPK[0] += _S_(PPK[5] ^ Mk16_le((u16 *) &TK[0])); | |
264 | PPK[1] += _S_(PPK[0] ^ Mk16_le((u16 *) &TK[2])); | |
265 | PPK[2] += _S_(PPK[1] ^ Mk16_le((u16 *) &TK[4])); | |
266 | PPK[3] += _S_(PPK[2] ^ Mk16_le((u16 *) &TK[6])); | |
267 | PPK[4] += _S_(PPK[3] ^ Mk16_le((u16 *) &TK[8])); | |
268 | PPK[5] += _S_(PPK[4] ^ Mk16_le((u16 *) &TK[10])); | |
269 | ||
270 | PPK[0] += RotR1(PPK[5] ^ Mk16_le((u16 *) &TK[12])); | |
271 | PPK[1] += RotR1(PPK[0] ^ Mk16_le((u16 *) &TK[14])); | |
272 | PPK[2] += RotR1(PPK[1]); | |
273 | PPK[3] += RotR1(PPK[2]); | |
274 | PPK[4] += RotR1(PPK[3]); | |
275 | PPK[5] += RotR1(PPK[4]); | |
276 | ||
277 | /* Step 3 - bring in last of TK bits, assign 24-bit WEP IV value | |
14b40d92 MK |
278 | * WEPSeed[0..2] is transmitted as WEP IV |
279 | */ | |
ecdfa446 GKH |
280 | WEPSeed[0] = Hi8(IV16); |
281 | WEPSeed[1] = (Hi8(IV16) | 0x20) & 0x7F; | |
282 | WEPSeed[2] = Lo8(IV16); | |
283 | WEPSeed[3] = Lo8((PPK[5] ^ Mk16_le((u16 *) &TK[0])) >> 1); | |
284 | ||
285 | #ifdef __BIG_ENDIAN | |
286 | { | |
287 | int i; | |
3a6b70c3 | 288 | |
ecdfa446 GKH |
289 | for (i = 0; i < 6; i++) |
290 | PPK[i] = (PPK[i] << 8) | (PPK[i] >> 8); | |
291 | } | |
292 | #endif | |
293 | } | |
294 | ||
295 | ||
94a79942 | 296 | static int rtllib_tkip_encrypt(struct sk_buff *skb, int hdr_len, void *priv) |
ecdfa446 | 297 | { |
94a79942 | 298 | struct rtllib_tkip_data *tkey = priv; |
ecdfa446 GKH |
299 | int len; |
300 | u8 *pos; | |
94a79942 | 301 | struct rtllib_hdr_4addr *hdr; |
a44325f9 LF |
302 | struct cb_desc *tcb_desc = (struct cb_desc *)(skb->cb + |
303 | MAX_DEV_ADDR_SIZE); | |
ecdfa446 GKH |
304 | struct blkcipher_desc desc = {.tfm = tkey->tx_tfm_arc4}; |
305 | int ret = 0; | |
ecdfa446 GKH |
306 | u8 rc4key[16], *icv; |
307 | u32 crc; | |
308 | struct scatterlist sg; | |
309 | ||
310 | if (skb_headroom(skb) < 8 || skb_tailroom(skb) < 4 || | |
311 | skb->len < hdr_len) | |
312 | return -1; | |
313 | ||
94a79942 | 314 | hdr = (struct rtllib_hdr_4addr *) skb->data; |
ecdfa446 | 315 | |
94a79942 | 316 | if (!tcb_desc->bHwSec) { |
ecdfa446 GKH |
317 | if (!tkey->tx_phase1_done) { |
318 | tkip_mixing_phase1(tkey->tx_ttak, tkey->key, hdr->addr2, | |
319 | tkey->tx_iv32); | |
320 | tkey->tx_phase1_done = 1; | |
321 | } | |
a44325f9 LF |
322 | tkip_mixing_phase2(rc4key, tkey->key, tkey->tx_ttak, |
323 | tkey->tx_iv16); | |
94a79942 | 324 | } else |
ecdfa446 GKH |
325 | tkey->tx_phase1_done = 1; |
326 | ||
327 | ||
328 | len = skb->len - hdr_len; | |
329 | pos = skb_push(skb, 8); | |
330 | memmove(pos, pos + 8, hdr_len); | |
331 | pos += hdr_len; | |
332 | ||
94a79942 | 333 | if (tcb_desc->bHwSec) { |
ecdfa446 GKH |
334 | *pos++ = Hi8(tkey->tx_iv16); |
335 | *pos++ = (Hi8(tkey->tx_iv16) | 0x20) & 0x7F; | |
336 | *pos++ = Lo8(tkey->tx_iv16); | |
94a79942 | 337 | } else { |
ecdfa446 GKH |
338 | *pos++ = rc4key[0]; |
339 | *pos++ = rc4key[1]; | |
340 | *pos++ = rc4key[2]; | |
341 | } | |
342 | ||
343 | *pos++ = (tkey->key_idx << 6) | (1 << 5) /* Ext IV included */; | |
344 | *pos++ = tkey->tx_iv32 & 0xff; | |
345 | *pos++ = (tkey->tx_iv32 >> 8) & 0xff; | |
346 | *pos++ = (tkey->tx_iv32 >> 16) & 0xff; | |
347 | *pos++ = (tkey->tx_iv32 >> 24) & 0xff; | |
348 | ||
94a79942 | 349 | if (!tcb_desc->bHwSec) { |
ecdfa446 | 350 | icv = skb_put(skb, 4); |
ecdfa446 | 351 | crc = ~crc32_le(~0, pos, len); |
ecdfa446 GKH |
352 | icv[0] = crc; |
353 | icv[1] = crc >> 8; | |
354 | icv[2] = crc >> 16; | |
355 | icv[3] = crc >> 24; | |
94a79942 | 356 | |
ecdfa446 | 357 | sg_init_one(&sg, pos, len+4); |
94a79942 LF |
358 | |
359 | ||
94a79942 | 360 | crypto_blkcipher_setkey(tkey->tx_tfm_arc4, rc4key, 16); |
a44325f9 | 361 | ret = crypto_blkcipher_encrypt(&desc, &sg, &sg, len + 4); |
ecdfa446 GKH |
362 | } |
363 | ||
364 | tkey->tx_iv16++; | |
365 | if (tkey->tx_iv16 == 0) { | |
366 | tkey->tx_phase1_done = 0; | |
367 | tkey->tx_iv32++; | |
368 | } | |
369 | ||
370 | if (!tcb_desc->bHwSec) | |
ecdfa446 | 371 | return ret; |
ecdfa446 | 372 | else |
94a79942 | 373 | return 0; |
ecdfa446 GKH |
374 | |
375 | ||
376 | } | |
377 | ||
94a79942 | 378 | static int rtllib_tkip_decrypt(struct sk_buff *skb, int hdr_len, void *priv) |
ecdfa446 | 379 | { |
94a79942 | 380 | struct rtllib_tkip_data *tkey = priv; |
ecdfa446 GKH |
381 | u8 keyidx, *pos; |
382 | u32 iv32; | |
383 | u16 iv16; | |
94a79942 | 384 | struct rtllib_hdr_4addr *hdr; |
a44325f9 LF |
385 | struct cb_desc *tcb_desc = (struct cb_desc *)(skb->cb + |
386 | MAX_DEV_ADDR_SIZE); | |
ecdfa446 | 387 | struct blkcipher_desc desc = {.tfm = tkey->rx_tfm_arc4}; |
ecdfa446 GKH |
388 | u8 rc4key[16]; |
389 | u8 icv[4]; | |
390 | u32 crc; | |
391 | struct scatterlist sg; | |
392 | int plen; | |
3a6b70c3 | 393 | |
ecdfa446 GKH |
394 | if (skb->len < hdr_len + 8 + 4) |
395 | return -1; | |
396 | ||
94a79942 | 397 | hdr = (struct rtllib_hdr_4addr *) skb->data; |
ecdfa446 GKH |
398 | pos = skb->data + hdr_len; |
399 | keyidx = pos[3]; | |
400 | if (!(keyidx & (1 << 5))) { | |
401 | if (net_ratelimit()) { | |
7bdfaa0a MK |
402 | netdev_dbg(skb->dev, |
403 | "Received packet without ExtIV flag from %pM\n", | |
404 | hdr->addr2); | |
ecdfa446 GKH |
405 | } |
406 | return -2; | |
407 | } | |
408 | keyidx >>= 6; | |
409 | if (tkey->key_idx != keyidx) { | |
7bdfaa0a MK |
410 | netdev_dbg(skb->dev, |
411 | "RX tkey->key_idx=%d frame keyidx=%d priv=%p\n", | |
412 | tkey->key_idx, keyidx, priv); | |
ecdfa446 GKH |
413 | return -6; |
414 | } | |
415 | if (!tkey->key_set) { | |
416 | if (net_ratelimit()) { | |
7bdfaa0a MK |
417 | netdev_dbg(skb->dev, |
418 | "Received packet from %pM with keyid=%d that does not have a configured key\n", | |
419 | hdr->addr2, keyidx); | |
ecdfa446 GKH |
420 | } |
421 | return -3; | |
422 | } | |
423 | iv16 = (pos[0] << 8) | pos[2]; | |
424 | iv32 = pos[4] | (pos[5] << 8) | (pos[6] << 16) | (pos[7] << 24); | |
425 | pos += 8; | |
426 | ||
a44325f9 | 427 | if (!tcb_desc->bHwSec || (skb->cb[0] == 1)) { |
94a79942 | 428 | if ((iv32 < tkey->rx_iv32 || |
a44325f9 LF |
429 | (iv32 == tkey->rx_iv32 && iv16 <= tkey->rx_iv16)) && |
430 | tkey->initialized) { | |
ecdfa446 | 431 | if (net_ratelimit()) { |
7bdfaa0a MK |
432 | netdev_dbg(skb->dev, |
433 | "Replay detected: STA= %pM previous TSC %08x%04x received TSC %08x%04x\n", | |
434 | hdr->addr2, tkey->rx_iv32, | |
435 | tkey->rx_iv16, iv32, iv16); | |
ecdfa446 GKH |
436 | } |
437 | tkey->dot11RSNAStatsTKIPReplays++; | |
438 | return -4; | |
439 | } | |
a44325f9 | 440 | tkey->initialized = true; |
ecdfa446 GKH |
441 | |
442 | if (iv32 != tkey->rx_iv32 || !tkey->rx_phase1_done) { | |
a44325f9 LF |
443 | tkip_mixing_phase1(tkey->rx_ttak, tkey->key, |
444 | hdr->addr2, iv32); | |
ecdfa446 GKH |
445 | tkey->rx_phase1_done = 1; |
446 | } | |
447 | tkip_mixing_phase2(rc4key, tkey->key, tkey->rx_ttak, iv16); | |
448 | ||
449 | plen = skb->len - hdr_len - 12; | |
450 | ||
ecdfa446 | 451 | sg_init_one(&sg, pos, plen+4); |
94a79942 | 452 | |
94a79942 | 453 | crypto_blkcipher_setkey(tkey->rx_tfm_arc4, rc4key, 16); |
ecdfa446 GKH |
454 | if (crypto_blkcipher_decrypt(&desc, &sg, &sg, plen + 4)) { |
455 | if (net_ratelimit()) { | |
7bdfaa0a MK |
456 | netdev_dbg(skb->dev, |
457 | "Failed to decrypt received packet from %pM\n", | |
458 | hdr->addr2); | |
ecdfa446 GKH |
459 | } |
460 | return -7; | |
461 | } | |
ecdfa446 | 462 | |
ecdfa446 | 463 | crc = ~crc32_le(~0, pos, plen); |
ecdfa446 GKH |
464 | icv[0] = crc; |
465 | icv[1] = crc >> 8; | |
466 | icv[2] = crc >> 16; | |
467 | icv[3] = crc >> 24; | |
468 | ||
469 | if (memcmp(icv, pos + plen, 4) != 0) { | |
470 | if (iv32 != tkey->rx_iv32) { | |
a44325f9 LF |
471 | /* Previously cached Phase1 result was already |
472 | * lost, so it needs to be recalculated for the | |
14b40d92 MK |
473 | * next packet. |
474 | */ | |
ecdfa446 GKH |
475 | tkey->rx_phase1_done = 0; |
476 | } | |
477 | if (net_ratelimit()) { | |
7bdfaa0a MK |
478 | netdev_dbg(skb->dev, |
479 | "ICV error detected: STA= %pM\n", | |
480 | hdr->addr2); | |
ecdfa446 GKH |
481 | } |
482 | tkey->dot11RSNAStatsTKIPICVErrors++; | |
483 | return -5; | |
484 | } | |
485 | ||
486 | } | |
487 | ||
488 | /* Update real counters only after Michael MIC verification has | |
14b40d92 MK |
489 | * completed |
490 | */ | |
ecdfa446 GKH |
491 | tkey->rx_iv32_new = iv32; |
492 | tkey->rx_iv16_new = iv16; | |
493 | ||
494 | /* Remove IV and ICV */ | |
495 | memmove(skb->data + 8, skb->data, hdr_len); | |
496 | skb_pull(skb, 8); | |
497 | skb_trim(skb, skb->len - 4); | |
498 | ||
ecdfa446 GKH |
499 | return keyidx; |
500 | } | |
501 | ||
502 | ||
a44325f9 LF |
503 | static int michael_mic(struct crypto_hash *tfm_michael, u8 *key, u8 *hdr, |
504 | u8 *data, size_t data_len, u8 *mic) | |
ecdfa446 | 505 | { |
a44325f9 LF |
506 | struct hash_desc desc; |
507 | struct scatterlist sg[2]; | |
508 | ||
509 | if (tfm_michael == NULL) { | |
d69d2054 | 510 | pr_warn("michael_mic: tfm_michael == NULL\n"); |
a44325f9 LF |
511 | return -1; |
512 | } | |
513 | sg_init_table(sg, 2); | |
514 | sg_set_buf(&sg[0], hdr, 16); | |
515 | sg_set_buf(&sg[1], data, data_len); | |
516 | ||
517 | if (crypto_hash_setkey(tfm_michael, key, 8)) | |
518 | return -1; | |
519 | ||
520 | desc.tfm = tfm_michael; | |
521 | desc.flags = 0; | |
522 | return crypto_hash_digest(&desc, sg, data_len + 16, mic); | |
ecdfa446 | 523 | } |
ecdfa446 GKH |
524 | |
525 | static void michael_mic_hdr(struct sk_buff *skb, u8 *hdr) | |
526 | { | |
94a79942 | 527 | struct rtllib_hdr_4addr *hdr11; |
ecdfa446 | 528 | |
94a79942 | 529 | hdr11 = (struct rtllib_hdr_4addr *) skb->data; |
ecdfa446 | 530 | switch (le16_to_cpu(hdr11->frame_ctl) & |
94a79942 LF |
531 | (RTLLIB_FCTL_FROMDS | RTLLIB_FCTL_TODS)) { |
532 | case RTLLIB_FCTL_TODS: | |
b57ceb19 MK |
533 | ether_addr_copy(hdr, hdr11->addr3); /* DA */ |
534 | ether_addr_copy(hdr + ETH_ALEN, hdr11->addr2); /* SA */ | |
ecdfa446 | 535 | break; |
94a79942 | 536 | case RTLLIB_FCTL_FROMDS: |
b57ceb19 MK |
537 | ether_addr_copy(hdr, hdr11->addr1); /* DA */ |
538 | ether_addr_copy(hdr + ETH_ALEN, hdr11->addr3); /* SA */ | |
ecdfa446 | 539 | break; |
94a79942 | 540 | case RTLLIB_FCTL_FROMDS | RTLLIB_FCTL_TODS: |
b57ceb19 MK |
541 | ether_addr_copy(hdr, hdr11->addr3); /* DA */ |
542 | ether_addr_copy(hdr + ETH_ALEN, hdr11->addr4); /* SA */ | |
ecdfa446 GKH |
543 | break; |
544 | case 0: | |
b57ceb19 MK |
545 | ether_addr_copy(hdr, hdr11->addr1); /* DA */ |
546 | ether_addr_copy(hdr + ETH_ALEN, hdr11->addr2); /* SA */ | |
ecdfa446 GKH |
547 | break; |
548 | } | |
549 | ||
550 | hdr[12] = 0; /* priority */ | |
551 | ||
552 | hdr[13] = hdr[14] = hdr[15] = 0; /* reserved */ | |
553 | } | |
554 | ||
555 | ||
94a79942 | 556 | static int rtllib_michael_mic_add(struct sk_buff *skb, int hdr_len, void *priv) |
ecdfa446 | 557 | { |
94a79942 | 558 | struct rtllib_tkip_data *tkey = priv; |
ecdfa446 | 559 | u8 *pos; |
94a79942 | 560 | struct rtllib_hdr_4addr *hdr; |
ecdfa446 | 561 | |
94a79942 | 562 | hdr = (struct rtllib_hdr_4addr *) skb->data; |
ecdfa446 GKH |
563 | |
564 | if (skb_tailroom(skb) < 8 || skb->len < hdr_len) { | |
7bdfaa0a MK |
565 | netdev_dbg(skb->dev, |
566 | "Invalid packet for Michael MIC add (tailroom=%d hdr_len=%d skb->len=%d)\n", | |
567 | skb_tailroom(skb), hdr_len, skb->len); | |
ecdfa446 GKH |
568 | return -1; |
569 | } | |
570 | ||
571 | michael_mic_hdr(skb, tkey->tx_hdr); | |
572 | ||
a44325f9 | 573 | if (RTLLIB_QOS_HAS_SEQ(le16_to_cpu(hdr->frame_ctl))) |
ecdfa446 | 574 | tkey->tx_hdr[12] = *(skb->data + hdr_len - 2) & 0x07; |
ecdfa446 | 575 | pos = skb_put(skb, 8); |
ecdfa446 | 576 | if (michael_mic(tkey->tx_tfm_michael, &tkey->key[16], tkey->tx_hdr, |
a44325f9 | 577 | skb->data + hdr_len, skb->len - 8 - hdr_len, pos)) |
ecdfa446 GKH |
578 | return -1; |
579 | ||
580 | return 0; | |
581 | } | |
582 | ||
583 | ||
94a79942 LF |
584 | static void rtllib_michael_mic_failure(struct net_device *dev, |
585 | struct rtllib_hdr_4addr *hdr, | |
ecdfa446 GKH |
586 | int keyidx) |
587 | { | |
588 | union iwreq_data wrqu; | |
589 | struct iw_michaelmicfailure ev; | |
590 | ||
591 | /* TODO: needed parameters: count, keyid, key type, TSC */ | |
592 | memset(&ev, 0, sizeof(ev)); | |
593 | ev.flags = keyidx & IW_MICFAILURE_KEY_ID; | |
594 | if (hdr->addr1[0] & 0x01) | |
595 | ev.flags |= IW_MICFAILURE_GROUP; | |
596 | else | |
597 | ev.flags |= IW_MICFAILURE_PAIRWISE; | |
598 | ev.src_addr.sa_family = ARPHRD_ETHER; | |
b57ceb19 | 599 | ether_addr_copy(ev.src_addr.sa_data, hdr->addr2); |
ecdfa446 GKH |
600 | memset(&wrqu, 0, sizeof(wrqu)); |
601 | wrqu.data.length = sizeof(ev); | |
602 | wireless_send_event(dev, IWEVMICHAELMICFAILURE, &wrqu, (char *) &ev); | |
603 | } | |
ecdfa446 | 604 | |
94a79942 | 605 | static int rtllib_michael_mic_verify(struct sk_buff *skb, int keyidx, |
32c44cb5 | 606 | int hdr_len, void *priv) |
ecdfa446 | 607 | { |
94a79942 | 608 | struct rtllib_tkip_data *tkey = priv; |
ecdfa446 | 609 | u8 mic[8]; |
94a79942 | 610 | struct rtllib_hdr_4addr *hdr; |
ecdfa446 | 611 | |
94a79942 | 612 | hdr = (struct rtllib_hdr_4addr *) skb->data; |
ecdfa446 GKH |
613 | |
614 | if (!tkey->key_set) | |
615 | return -1; | |
616 | ||
617 | michael_mic_hdr(skb, tkey->rx_hdr); | |
a44325f9 | 618 | if (RTLLIB_QOS_HAS_SEQ(le16_to_cpu(hdr->frame_ctl))) |
ecdfa446 | 619 | tkey->rx_hdr[12] = *(skb->data + hdr_len - 2) & 0x07; |
ecdfa446 | 620 | |
ecdfa446 | 621 | if (michael_mic(tkey->rx_tfm_michael, &tkey->key[24], tkey->rx_hdr, |
a44325f9 | 622 | skb->data + hdr_len, skb->len - 8 - hdr_len, mic)) |
94a79942 LF |
623 | return -1; |
624 | ||
32c44cb5 | 625 | if (memcmp(mic, skb->data + skb->len - 8, 8) != 0) { |
94a79942 | 626 | struct rtllib_hdr_4addr *hdr; |
3a6b70c3 | 627 | |
94a79942 | 628 | hdr = (struct rtllib_hdr_4addr *) skb->data; |
7bdfaa0a MK |
629 | netdev_dbg(skb->dev, |
630 | "Michael MIC verification failed for MSDU from %pM keyidx=%d\n", | |
631 | hdr->addr2, keyidx); | |
632 | netdev_dbg(skb->dev, "%d\n", | |
633 | memcmp(mic, skb->data + skb->len - 8, 8) != 0); | |
94a79942 | 634 | if (skb->dev) { |
d69d2054 | 635 | pr_info("skb->dev != NULL\n"); |
94a79942 | 636 | rtllib_michael_mic_failure(skb->dev, hdr, keyidx); |
a44325f9 | 637 | } |
ecdfa446 GKH |
638 | tkey->dot11RSNAStatsTKIPLocalMICFailures++; |
639 | return -1; | |
640 | } | |
641 | ||
642 | /* Update TSC counters for RX now that the packet verification has | |
14b40d92 MK |
643 | * completed. |
644 | */ | |
ecdfa446 GKH |
645 | tkey->rx_iv32 = tkey->rx_iv32_new; |
646 | tkey->rx_iv16 = tkey->rx_iv16_new; | |
647 | ||
648 | skb_trim(skb, skb->len - 8); | |
649 | ||
650 | return 0; | |
651 | } | |
652 | ||
653 | ||
94a79942 | 654 | static int rtllib_tkip_set_key(void *key, int len, u8 *seq, void *priv) |
ecdfa446 | 655 | { |
94a79942 | 656 | struct rtllib_tkip_data *tkey = priv; |
ecdfa446 | 657 | int keyidx; |
ecdfa446 GKH |
658 | struct crypto_hash *tfm = tkey->tx_tfm_michael; |
659 | struct crypto_blkcipher *tfm2 = tkey->tx_tfm_arc4; | |
660 | struct crypto_hash *tfm3 = tkey->rx_tfm_michael; | |
661 | struct crypto_blkcipher *tfm4 = tkey->rx_tfm_arc4; | |
ecdfa446 GKH |
662 | |
663 | keyidx = tkey->key_idx; | |
664 | memset(tkey, 0, sizeof(*tkey)); | |
665 | tkey->key_idx = keyidx; | |
ecdfa446 GKH |
666 | tkey->tx_tfm_michael = tfm; |
667 | tkey->tx_tfm_arc4 = tfm2; | |
668 | tkey->rx_tfm_michael = tfm3; | |
669 | tkey->rx_tfm_arc4 = tfm4; | |
ecdfa446 GKH |
670 | |
671 | if (len == TKIP_KEY_LEN) { | |
672 | memcpy(tkey->key, key, TKIP_KEY_LEN); | |
673 | tkey->key_set = 1; | |
674 | tkey->tx_iv16 = 1; /* TSC is initialized to 1 */ | |
675 | if (seq) { | |
676 | tkey->rx_iv32 = (seq[5] << 24) | (seq[4] << 16) | | |
677 | (seq[3] << 8) | seq[2]; | |
678 | tkey->rx_iv16 = (seq[1] << 8) | seq[0]; | |
679 | } | |
680 | } else if (len == 0) | |
681 | tkey->key_set = 0; | |
682 | else | |
683 | return -1; | |
684 | ||
685 | return 0; | |
686 | } | |
687 | ||
688 | ||
94a79942 | 689 | static int rtllib_tkip_get_key(void *key, int len, u8 *seq, void *priv) |
ecdfa446 | 690 | { |
94a79942 | 691 | struct rtllib_tkip_data *tkey = priv; |
ecdfa446 GKH |
692 | |
693 | if (len < TKIP_KEY_LEN) | |
694 | return -1; | |
695 | ||
696 | if (!tkey->key_set) | |
697 | return 0; | |
698 | memcpy(key, tkey->key, TKIP_KEY_LEN); | |
699 | ||
700 | if (seq) { | |
701 | /* Return the sequence number of the last transmitted frame. */ | |
702 | u16 iv16 = tkey->tx_iv16; | |
703 | u32 iv32 = tkey->tx_iv32; | |
3a6b70c3 | 704 | |
ecdfa446 GKH |
705 | if (iv16 == 0) |
706 | iv32--; | |
707 | iv16--; | |
708 | seq[0] = tkey->tx_iv16; | |
709 | seq[1] = tkey->tx_iv16 >> 8; | |
710 | seq[2] = tkey->tx_iv32; | |
711 | seq[3] = tkey->tx_iv32 >> 8; | |
712 | seq[4] = tkey->tx_iv32 >> 16; | |
713 | seq[5] = tkey->tx_iv32 >> 24; | |
714 | } | |
715 | ||
716 | return TKIP_KEY_LEN; | |
717 | } | |
718 | ||
719 | ||
6bbefe86 | 720 | static void rtllib_tkip_print_stats(struct seq_file *m, void *priv) |
ecdfa446 | 721 | { |
94a79942 | 722 | struct rtllib_tkip_data *tkip = priv; |
3a6b70c3 | 723 | |
6bbefe86 | 724 | seq_printf(m, |
0822339b | 725 | "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 |
726 | tkip->key_idx, tkip->key_set, |
727 | (tkip->tx_iv32 >> 24) & 0xff, | |
728 | (tkip->tx_iv32 >> 16) & 0xff, | |
729 | (tkip->tx_iv32 >> 8) & 0xff, | |
730 | tkip->tx_iv32 & 0xff, | |
731 | (tkip->tx_iv16 >> 8) & 0xff, | |
732 | tkip->tx_iv16 & 0xff, | |
733 | (tkip->rx_iv32 >> 24) & 0xff, | |
734 | (tkip->rx_iv32 >> 16) & 0xff, | |
735 | (tkip->rx_iv32 >> 8) & 0xff, | |
736 | tkip->rx_iv32 & 0xff, | |
737 | (tkip->rx_iv16 >> 8) & 0xff, | |
738 | tkip->rx_iv16 & 0xff, | |
739 | tkip->dot11RSNAStatsTKIPReplays, | |
740 | tkip->dot11RSNAStatsTKIPICVErrors, | |
741 | tkip->dot11RSNAStatsTKIPLocalMICFailures); | |
ecdfa446 GKH |
742 | } |
743 | ||
32c44cb5 | 744 | static struct lib80211_crypto_ops rtllib_crypt_tkip = { |
3b148be0 | 745 | .name = "R-TKIP", |
94a79942 LF |
746 | .init = rtllib_tkip_init, |
747 | .deinit = rtllib_tkip_deinit, | |
748 | .encrypt_mpdu = rtllib_tkip_encrypt, | |
749 | .decrypt_mpdu = rtllib_tkip_decrypt, | |
750 | .encrypt_msdu = rtllib_michael_mic_add, | |
751 | .decrypt_msdu = rtllib_michael_mic_verify, | |
752 | .set_key = rtllib_tkip_set_key, | |
753 | .get_key = rtllib_tkip_get_key, | |
754 | .print_stats = rtllib_tkip_print_stats, | |
32c44cb5 SM |
755 | .extra_mpdu_prefix_len = 4 + 4, /* IV + ExtIV */ |
756 | .extra_mpdu_postfix_len = 4, /* ICV */ | |
757 | .extra_msdu_postfix_len = 8, /* MIC */ | |
a44325f9 | 758 | .owner = THIS_MODULE, |
ecdfa446 GKH |
759 | }; |
760 | ||
761 | ||
316de3ca | 762 | static int __init rtllib_crypto_tkip_init(void) |
ecdfa446 | 763 | { |
3b148be0 | 764 | return lib80211_register_crypto_ops(&rtllib_crypt_tkip); |
ecdfa446 GKH |
765 | } |
766 | ||
767 | ||
316de3ca | 768 | static void __exit rtllib_crypto_tkip_exit(void) |
ecdfa446 | 769 | { |
3b148be0 | 770 | lib80211_unregister_crypto_ops(&rtllib_crypt_tkip); |
ecdfa446 GKH |
771 | } |
772 | ||
d37e0208 SM |
773 | module_init(rtllib_crypto_tkip_init); |
774 | module_exit(rtllib_crypto_tkip_exit); | |
775 | ||
776 | MODULE_LICENSE("GPL"); |