Commit | Line | Data |
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21042e41 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
b453872c | 2 | /* |
274bfb8d | 3 | * lib80211 crypt: host-based TKIP encryption implementation for lib80211 |
b453872c | 4 | * |
85d32e7b | 5 | * Copyright (c) 2003-2004, Jouni Malinen <j@w1.fi> |
274bfb8d | 6 | * Copyright (c) 2008, John W. Linville <linville@tuxdriver.com> |
b453872c JG |
7 | */ |
8 | ||
e9c0268f JP |
9 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
10 | ||
f12cc209 | 11 | #include <linux/err.h> |
4be29701 | 12 | #include <linux/fips.h> |
b453872c JG |
13 | #include <linux/module.h> |
14 | #include <linux/init.h> | |
15 | #include <linux/slab.h> | |
16 | #include <linux/random.h> | |
11763609 | 17 | #include <linux/scatterlist.h> |
b453872c JG |
18 | #include <linux/skbuff.h> |
19 | #include <linux/netdevice.h> | |
d7fe0f24 | 20 | #include <linux/mm.h> |
b453872c JG |
21 | #include <linux/if_ether.h> |
22 | #include <linux/if_arp.h> | |
23 | #include <asm/string.h> | |
24 | ||
274bfb8d JL |
25 | #include <linux/wireless.h> |
26 | #include <linux/ieee80211.h> | |
27 | #include <net/iw_handler.h> | |
b453872c | 28 | |
4be29701 | 29 | #include <crypto/arc4.h> |
608fb34c | 30 | #include <crypto/hash.h> |
b802a5d6 | 31 | #include <linux/crypto.h> |
b453872c JG |
32 | #include <linux/crc32.h> |
33 | ||
274bfb8d JL |
34 | #include <net/lib80211.h> |
35 | ||
b453872c | 36 | MODULE_AUTHOR("Jouni Malinen"); |
274bfb8d | 37 | MODULE_DESCRIPTION("lib80211 crypt: TKIP"); |
b453872c JG |
38 | MODULE_LICENSE("GPL"); |
39 | ||
299af9d3 AT |
40 | #define TKIP_HDR_LEN 8 |
41 | ||
274bfb8d | 42 | struct lib80211_tkip_data { |
b453872c JG |
43 | #define TKIP_KEY_LEN 32 |
44 | u8 key[TKIP_KEY_LEN]; | |
45 | int key_set; | |
46 | ||
47 | u32 tx_iv32; | |
48 | u16 tx_iv16; | |
49 | u16 tx_ttak[5]; | |
50 | int tx_phase1_done; | |
51 | ||
52 | u32 rx_iv32; | |
53 | u16 rx_iv16; | |
54 | u16 rx_ttak[5]; | |
55 | int rx_phase1_done; | |
56 | u32 rx_iv32_new; | |
57 | u16 rx_iv16_new; | |
58 | ||
59 | u32 dot11RSNAStatsTKIPReplays; | |
60 | u32 dot11RSNAStatsTKIPICVErrors; | |
61 | u32 dot11RSNAStatsTKIPLocalMICFailures; | |
62 | ||
63 | int key_idx; | |
64 | ||
4be29701 AB |
65 | struct arc4_ctx rx_ctx_arc4; |
66 | struct arc4_ctx tx_ctx_arc4; | |
d17504b1 | 67 | struct crypto_shash *rx_tfm_michael; |
d17504b1 | 68 | struct crypto_shash *tx_tfm_michael; |
b453872c JG |
69 | |
70 | /* scratch buffers for virt_to_page() (crypto API) */ | |
71 | u8 rx_hdr[16], tx_hdr[16]; | |
20d64713 | 72 | |
6eb6edf0 | 73 | unsigned long flags; |
b453872c JG |
74 | }; |
75 | ||
274bfb8d | 76 | static unsigned long lib80211_tkip_set_flags(unsigned long flags, void *priv) |
6eb6edf0 | 77 | { |
274bfb8d | 78 | struct lib80211_tkip_data *_priv = priv; |
6eb6edf0 JK |
79 | unsigned long old_flags = _priv->flags; |
80 | _priv->flags = flags; | |
81 | return old_flags; | |
82 | } | |
83 | ||
274bfb8d | 84 | static unsigned long lib80211_tkip_get_flags(void *priv) |
6eb6edf0 | 85 | { |
274bfb8d | 86 | struct lib80211_tkip_data *_priv = priv; |
6eb6edf0 JK |
87 | return _priv->flags; |
88 | } | |
89 | ||
274bfb8d | 90 | static void *lib80211_tkip_init(int key_idx) |
b453872c | 91 | { |
274bfb8d | 92 | struct lib80211_tkip_data *priv; |
b453872c | 93 | |
4be29701 AB |
94 | if (fips_enabled) |
95 | return NULL; | |
96 | ||
8aa914b7 | 97 | priv = kzalloc(sizeof(*priv), GFP_ATOMIC); |
b453872c JG |
98 | if (priv == NULL) |
99 | goto fail; | |
20d64713 | 100 | |
b453872c JG |
101 | priv->key_idx = key_idx; |
102 | ||
d17504b1 | 103 | priv->tx_tfm_michael = crypto_alloc_shash("michael_mic", 0, 0); |
28eb177d | 104 | if (IS_ERR(priv->tx_tfm_michael)) { |
18379879 | 105 | priv->tx_tfm_michael = NULL; |
5a656949 ZY |
106 | goto fail; |
107 | } | |
108 | ||
d17504b1 | 109 | priv->rx_tfm_michael = crypto_alloc_shash("michael_mic", 0, 0); |
28eb177d | 110 | if (IS_ERR(priv->rx_tfm_michael)) { |
18379879 | 111 | priv->rx_tfm_michael = NULL; |
b453872c JG |
112 | goto fail; |
113 | } | |
114 | ||
115 | return priv; | |
116 | ||
0edd5b44 | 117 | fail: |
b453872c | 118 | if (priv) { |
d17504b1 | 119 | crypto_free_shash(priv->tx_tfm_michael); |
d17504b1 | 120 | crypto_free_shash(priv->rx_tfm_michael); |
b453872c JG |
121 | kfree(priv); |
122 | } | |
123 | ||
124 | return NULL; | |
125 | } | |
126 | ||
274bfb8d | 127 | static void lib80211_tkip_deinit(void *priv) |
b453872c | 128 | { |
274bfb8d | 129 | struct lib80211_tkip_data *_priv = priv; |
5a656949 | 130 | if (_priv) { |
d17504b1 | 131 | crypto_free_shash(_priv->tx_tfm_michael); |
d17504b1 | 132 | crypto_free_shash(_priv->rx_tfm_michael); |
5a656949 | 133 | } |
453431a5 | 134 | kfree_sensitive(priv); |
b453872c JG |
135 | } |
136 | ||
b453872c JG |
137 | static inline u16 RotR1(u16 val) |
138 | { | |
139 | return (val >> 1) | (val << 15); | |
140 | } | |
141 | ||
b453872c JG |
142 | static inline u8 Lo8(u16 val) |
143 | { | |
144 | return val & 0xff; | |
145 | } | |
146 | ||
b453872c JG |
147 | static inline u8 Hi8(u16 val) |
148 | { | |
149 | return val >> 8; | |
150 | } | |
151 | ||
b453872c JG |
152 | static inline u16 Lo16(u32 val) |
153 | { | |
154 | return val & 0xffff; | |
155 | } | |
156 | ||
b453872c JG |
157 | static inline u16 Hi16(u32 val) |
158 | { | |
159 | return val >> 16; | |
160 | } | |
161 | ||
b453872c JG |
162 | static inline u16 Mk16(u8 hi, u8 lo) |
163 | { | |
164 | return lo | (((u16) hi) << 8); | |
165 | } | |
166 | ||
d9e94d56 | 167 | static inline u16 Mk16_le(__le16 * v) |
b453872c JG |
168 | { |
169 | return le16_to_cpu(*v); | |
170 | } | |
171 | ||
0edd5b44 | 172 | static const u16 Sbox[256] = { |
b453872c JG |
173 | 0xC6A5, 0xF884, 0xEE99, 0xF68D, 0xFF0D, 0xD6BD, 0xDEB1, 0x9154, |
174 | 0x6050, 0x0203, 0xCEA9, 0x567D, 0xE719, 0xB562, 0x4DE6, 0xEC9A, | |
175 | 0x8F45, 0x1F9D, 0x8940, 0xFA87, 0xEF15, 0xB2EB, 0x8EC9, 0xFB0B, | |
176 | 0x41EC, 0xB367, 0x5FFD, 0x45EA, 0x23BF, 0x53F7, 0xE496, 0x9B5B, | |
177 | 0x75C2, 0xE11C, 0x3DAE, 0x4C6A, 0x6C5A, 0x7E41, 0xF502, 0x834F, | |
178 | 0x685C, 0x51F4, 0xD134, 0xF908, 0xE293, 0xAB73, 0x6253, 0x2A3F, | |
179 | 0x080C, 0x9552, 0x4665, 0x9D5E, 0x3028, 0x37A1, 0x0A0F, 0x2FB5, | |
180 | 0x0E09, 0x2436, 0x1B9B, 0xDF3D, 0xCD26, 0x4E69, 0x7FCD, 0xEA9F, | |
181 | 0x121B, 0x1D9E, 0x5874, 0x342E, 0x362D, 0xDCB2, 0xB4EE, 0x5BFB, | |
182 | 0xA4F6, 0x764D, 0xB761, 0x7DCE, 0x527B, 0xDD3E, 0x5E71, 0x1397, | |
183 | 0xA6F5, 0xB968, 0x0000, 0xC12C, 0x4060, 0xE31F, 0x79C8, 0xB6ED, | |
184 | 0xD4BE, 0x8D46, 0x67D9, 0x724B, 0x94DE, 0x98D4, 0xB0E8, 0x854A, | |
185 | 0xBB6B, 0xC52A, 0x4FE5, 0xED16, 0x86C5, 0x9AD7, 0x6655, 0x1194, | |
186 | 0x8ACF, 0xE910, 0x0406, 0xFE81, 0xA0F0, 0x7844, 0x25BA, 0x4BE3, | |
187 | 0xA2F3, 0x5DFE, 0x80C0, 0x058A, 0x3FAD, 0x21BC, 0x7048, 0xF104, | |
188 | 0x63DF, 0x77C1, 0xAF75, 0x4263, 0x2030, 0xE51A, 0xFD0E, 0xBF6D, | |
189 | 0x814C, 0x1814, 0x2635, 0xC32F, 0xBEE1, 0x35A2, 0x88CC, 0x2E39, | |
190 | 0x9357, 0x55F2, 0xFC82, 0x7A47, 0xC8AC, 0xBAE7, 0x322B, 0xE695, | |
191 | 0xC0A0, 0x1998, 0x9ED1, 0xA37F, 0x4466, 0x547E, 0x3BAB, 0x0B83, | |
192 | 0x8CCA, 0xC729, 0x6BD3, 0x283C, 0xA779, 0xBCE2, 0x161D, 0xAD76, | |
193 | 0xDB3B, 0x6456, 0x744E, 0x141E, 0x92DB, 0x0C0A, 0x486C, 0xB8E4, | |
194 | 0x9F5D, 0xBD6E, 0x43EF, 0xC4A6, 0x39A8, 0x31A4, 0xD337, 0xF28B, | |
195 | 0xD532, 0x8B43, 0x6E59, 0xDAB7, 0x018C, 0xB164, 0x9CD2, 0x49E0, | |
196 | 0xD8B4, 0xACFA, 0xF307, 0xCF25, 0xCAAF, 0xF48E, 0x47E9, 0x1018, | |
197 | 0x6FD5, 0xF088, 0x4A6F, 0x5C72, 0x3824, 0x57F1, 0x73C7, 0x9751, | |
198 | 0xCB23, 0xA17C, 0xE89C, 0x3E21, 0x96DD, 0x61DC, 0x0D86, 0x0F85, | |
199 | 0xE090, 0x7C42, 0x71C4, 0xCCAA, 0x90D8, 0x0605, 0xF701, 0x1C12, | |
200 | 0xC2A3, 0x6A5F, 0xAEF9, 0x69D0, 0x1791, 0x9958, 0x3A27, 0x27B9, | |
201 | 0xD938, 0xEB13, 0x2BB3, 0x2233, 0xD2BB, 0xA970, 0x0789, 0x33A7, | |
202 | 0x2DB6, 0x3C22, 0x1592, 0xC920, 0x8749, 0xAAFF, 0x5078, 0xA57A, | |
203 | 0x038F, 0x59F8, 0x0980, 0x1A17, 0x65DA, 0xD731, 0x84C6, 0xD0B8, | |
204 | 0x82C3, 0x29B0, 0x5A77, 0x1E11, 0x7BCB, 0xA8FC, 0x6DD6, 0x2C3A, | |
205 | }; | |
206 | ||
b453872c JG |
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 | ||
b453872c JG |
213 | #define PHASE1_LOOP_COUNT 8 |
214 | ||
0edd5b44 JG |
215 | static void tkip_mixing_phase1(u16 * TTAK, const u8 * TK, const u8 * TA, |
216 | u32 IV32) | |
b453872c JG |
217 | { |
218 | int i, j; | |
219 | ||
220 | /* Initialize the 80-bit TTAK from TSC (IV32) and TA[0..5] */ | |
221 | TTAK[0] = Lo16(IV32); | |
222 | TTAK[1] = Hi16(IV32); | |
223 | TTAK[2] = Mk16(TA[1], TA[0]); | |
224 | TTAK[3] = Mk16(TA[3], TA[2]); | |
225 | TTAK[4] = Mk16(TA[5], TA[4]); | |
226 | ||
227 | for (i = 0; i < PHASE1_LOOP_COUNT; i++) { | |
228 | j = 2 * (i & 1); | |
229 | TTAK[0] += _S_(TTAK[4] ^ Mk16(TK[1 + j], TK[0 + j])); | |
230 | TTAK[1] += _S_(TTAK[0] ^ Mk16(TK[5 + j], TK[4 + j])); | |
231 | TTAK[2] += _S_(TTAK[1] ^ Mk16(TK[9 + j], TK[8 + j])); | |
232 | TTAK[3] += _S_(TTAK[2] ^ Mk16(TK[13 + j], TK[12 + j])); | |
233 | TTAK[4] += _S_(TTAK[3] ^ Mk16(TK[1 + j], TK[0 + j])) + i; | |
234 | } | |
235 | } | |
236 | ||
0edd5b44 | 237 | static void tkip_mixing_phase2(u8 * WEPSeed, const u8 * TK, const u16 * TTAK, |
b453872c JG |
238 | u16 IV16) |
239 | { | |
240 | /* Make temporary area overlap WEP seed so that the final copy can be | |
241 | * avoided on little endian hosts. */ | |
0edd5b44 | 242 | u16 *PPK = (u16 *) & WEPSeed[4]; |
b453872c JG |
243 | |
244 | /* Step 1 - make copy of TTAK and bring in TSC */ | |
245 | PPK[0] = TTAK[0]; | |
246 | PPK[1] = TTAK[1]; | |
247 | PPK[2] = TTAK[2]; | |
248 | PPK[3] = TTAK[3]; | |
249 | PPK[4] = TTAK[4]; | |
250 | PPK[5] = TTAK[4] + IV16; | |
251 | ||
252 | /* Step 2 - 96-bit bijective mixing using S-box */ | |
d9e94d56 AV |
253 | PPK[0] += _S_(PPK[5] ^ Mk16_le((__le16 *) & TK[0])); |
254 | PPK[1] += _S_(PPK[0] ^ Mk16_le((__le16 *) & TK[2])); | |
255 | PPK[2] += _S_(PPK[1] ^ Mk16_le((__le16 *) & TK[4])); | |
256 | PPK[3] += _S_(PPK[2] ^ Mk16_le((__le16 *) & TK[6])); | |
257 | PPK[4] += _S_(PPK[3] ^ Mk16_le((__le16 *) & TK[8])); | |
258 | PPK[5] += _S_(PPK[4] ^ Mk16_le((__le16 *) & TK[10])); | |
259 | ||
260 | PPK[0] += RotR1(PPK[5] ^ Mk16_le((__le16 *) & TK[12])); | |
261 | PPK[1] += RotR1(PPK[0] ^ Mk16_le((__le16 *) & TK[14])); | |
b453872c JG |
262 | PPK[2] += RotR1(PPK[1]); |
263 | PPK[3] += RotR1(PPK[2]); | |
264 | PPK[4] += RotR1(PPK[3]); | |
265 | PPK[5] += RotR1(PPK[4]); | |
266 | ||
267 | /* Step 3 - bring in last of TK bits, assign 24-bit WEP IV value | |
268 | * WEPSeed[0..2] is transmitted as WEP IV */ | |
269 | WEPSeed[0] = Hi8(IV16); | |
270 | WEPSeed[1] = (Hi8(IV16) | 0x20) & 0x7F; | |
271 | WEPSeed[2] = Lo8(IV16); | |
d9e94d56 | 272 | WEPSeed[3] = Lo8((PPK[5] ^ Mk16_le((__le16 *) & TK[0])) >> 1); |
b453872c JG |
273 | |
274 | #ifdef __BIG_ENDIAN | |
275 | { | |
276 | int i; | |
277 | for (i = 0; i < 6; i++) | |
278 | PPK[i] = (PPK[i] << 8) | (PPK[i] >> 8); | |
279 | } | |
280 | #endif | |
281 | } | |
282 | ||
274bfb8d | 283 | static int lib80211_tkip_hdr(struct sk_buff *skb, int hdr_len, |
9184d934 | 284 | u8 * rc4key, int keylen, void *priv) |
b453872c | 285 | { |
274bfb8d | 286 | struct lib80211_tkip_data *tkey = priv; |
9184d934 | 287 | u8 *pos; |
274bfb8d | 288 | struct ieee80211_hdr *hdr; |
b453872c | 289 | |
274bfb8d | 290 | hdr = (struct ieee80211_hdr *)skb->data; |
20d64713 | 291 | |
299af9d3 | 292 | if (skb_headroom(skb) < TKIP_HDR_LEN || skb->len < hdr_len) |
9184d934 ZY |
293 | return -1; |
294 | ||
295 | if (rc4key == NULL || keylen < 16) | |
296 | return -1; | |
b453872c | 297 | |
b453872c JG |
298 | if (!tkey->tx_phase1_done) { |
299 | tkip_mixing_phase1(tkey->tx_ttak, tkey->key, hdr->addr2, | |
300 | tkey->tx_iv32); | |
301 | tkey->tx_phase1_done = 1; | |
302 | } | |
303 | tkip_mixing_phase2(rc4key, tkey->key, tkey->tx_ttak, tkey->tx_iv16); | |
304 | ||
299af9d3 AT |
305 | pos = skb_push(skb, TKIP_HDR_LEN); |
306 | memmove(pos, pos + TKIP_HDR_LEN, hdr_len); | |
b453872c | 307 | pos += hdr_len; |
b453872c | 308 | |
31b59eae JK |
309 | *pos++ = *rc4key; |
310 | *pos++ = *(rc4key + 1); | |
311 | *pos++ = *(rc4key + 2); | |
0edd5b44 | 312 | *pos++ = (tkey->key_idx << 6) | (1 << 5) /* Ext IV included */ ; |
b453872c JG |
313 | *pos++ = tkey->tx_iv32 & 0xff; |
314 | *pos++ = (tkey->tx_iv32 >> 8) & 0xff; | |
315 | *pos++ = (tkey->tx_iv32 >> 16) & 0xff; | |
316 | *pos++ = (tkey->tx_iv32 >> 24) & 0xff; | |
317 | ||
9184d934 ZY |
318 | tkey->tx_iv16++; |
319 | if (tkey->tx_iv16 == 0) { | |
320 | tkey->tx_phase1_done = 0; | |
321 | tkey->tx_iv32++; | |
322 | } | |
b453872c | 323 | |
299af9d3 | 324 | return TKIP_HDR_LEN; |
31b59eae JK |
325 | } |
326 | ||
274bfb8d | 327 | static int lib80211_tkip_encrypt(struct sk_buff *skb, int hdr_len, void *priv) |
31b59eae | 328 | { |
274bfb8d | 329 | struct lib80211_tkip_data *tkey = priv; |
31b59eae | 330 | int len; |
9184d934 ZY |
331 | u8 rc4key[16], *pos, *icv; |
332 | u32 crc; | |
31b59eae | 333 | |
6eb6edf0 | 334 | if (tkey->flags & IEEE80211_CRYPTO_TKIP_COUNTERMEASURES) { |
e87cc472 JP |
335 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; |
336 | net_dbg_ratelimited("TKIP countermeasures: dropped TX packet to %pM\n", | |
337 | hdr->addr1); | |
31b59eae JK |
338 | return -1; |
339 | } | |
340 | ||
341 | if (skb_tailroom(skb) < 4 || skb->len < hdr_len) | |
342 | return -1; | |
343 | ||
344 | len = skb->len - hdr_len; | |
345 | pos = skb->data + hdr_len; | |
346 | ||
274bfb8d | 347 | if ((lib80211_tkip_hdr(skb, hdr_len, rc4key, 16, priv)) < 0) |
31b59eae JK |
348 | return -1; |
349 | ||
9184d934 | 350 | crc = ~crc32_le(~0, pos, len); |
d0833a6a | 351 | icv = skb_put(skb, 4); |
9184d934 ZY |
352 | icv[0] = crc; |
353 | icv[1] = crc >> 8; | |
354 | icv[2] = crc >> 16; | |
355 | icv[3] = crc >> 24; | |
356 | ||
4be29701 AB |
357 | arc4_setkey(&tkey->tx_ctx_arc4, rc4key, 16); |
358 | arc4_crypt(&tkey->tx_ctx_arc4, pos, pos, len + 4); | |
359 | ||
b802a5d6 | 360 | return 0; |
b4328d87 ZY |
361 | } |
362 | ||
18379879 JG |
363 | /* |
364 | * deal with seq counter wrapping correctly. | |
365 | * refer to timer_after() for jiffies wrapping handling | |
366 | */ | |
367 | static inline int tkip_replay_check(u32 iv32_n, u16 iv16_n, | |
368 | u32 iv32_o, u16 iv16_o) | |
369 | { | |
370 | if ((s32)iv32_n - (s32)iv32_o < 0 || | |
371 | (iv32_n == iv32_o && iv16_n <= iv16_o)) | |
372 | return 1; | |
373 | return 0; | |
374 | } | |
375 | ||
274bfb8d | 376 | static int lib80211_tkip_decrypt(struct sk_buff *skb, int hdr_len, void *priv) |
b453872c | 377 | { |
274bfb8d | 378 | struct lib80211_tkip_data *tkey = priv; |
b453872c JG |
379 | u8 rc4key[16]; |
380 | u8 keyidx, *pos; | |
381 | u32 iv32; | |
382 | u16 iv16; | |
274bfb8d | 383 | struct ieee80211_hdr *hdr; |
b453872c JG |
384 | u8 icv[4]; |
385 | u32 crc; | |
b453872c JG |
386 | int plen; |
387 | ||
274bfb8d | 388 | hdr = (struct ieee80211_hdr *)skb->data; |
20d64713 | 389 | |
6eb6edf0 | 390 | if (tkey->flags & IEEE80211_CRYPTO_TKIP_COUNTERMEASURES) { |
e87cc472 JP |
391 | net_dbg_ratelimited("TKIP countermeasures: dropped received packet from %pM\n", |
392 | hdr->addr2); | |
20d64713 JK |
393 | return -1; |
394 | } | |
395 | ||
299af9d3 | 396 | if (skb->len < hdr_len + TKIP_HDR_LEN + 4) |
b453872c JG |
397 | return -1; |
398 | ||
b453872c JG |
399 | pos = skb->data + hdr_len; |
400 | keyidx = pos[3]; | |
401 | if (!(keyidx & (1 << 5))) { | |
e87cc472 JP |
402 | net_dbg_ratelimited("TKIP: received packet without ExtIV flag from %pM\n", |
403 | hdr->addr2); | |
b453872c JG |
404 | return -2; |
405 | } | |
406 | keyidx >>= 6; | |
407 | if (tkey->key_idx != keyidx) { | |
996bf99c JB |
408 | net_dbg_ratelimited("TKIP: RX tkey->key_idx=%d frame keyidx=%d\n", |
409 | tkey->key_idx, keyidx); | |
b453872c JG |
410 | return -6; |
411 | } | |
412 | if (!tkey->key_set) { | |
e87cc472 JP |
413 | net_dbg_ratelimited("TKIP: received packet from %pM with keyid=%d that does not have a configured key\n", |
414 | hdr->addr2, keyidx); | |
b453872c JG |
415 | return -3; |
416 | } | |
417 | iv16 = (pos[0] << 8) | pos[2]; | |
418 | iv32 = pos[4] | (pos[5] << 8) | (pos[6] << 16) | (pos[7] << 24); | |
299af9d3 | 419 | pos += TKIP_HDR_LEN; |
b453872c | 420 | |
b4328d87 | 421 | if (tkip_replay_check(iv32, iv16, tkey->rx_iv32, tkey->rx_iv16)) { |
6f16bf3b | 422 | #ifdef CONFIG_LIB80211_DEBUG |
e87cc472 JP |
423 | net_dbg_ratelimited("TKIP: replay detected: STA=%pM previous TSC %08x%04x received TSC %08x%04x\n", |
424 | hdr->addr2, tkey->rx_iv32, tkey->rx_iv16, | |
425 | iv32, iv16); | |
6f16bf3b | 426 | #endif |
b453872c JG |
427 | tkey->dot11RSNAStatsTKIPReplays++; |
428 | return -4; | |
429 | } | |
430 | ||
431 | if (iv32 != tkey->rx_iv32 || !tkey->rx_phase1_done) { | |
432 | tkip_mixing_phase1(tkey->rx_ttak, tkey->key, hdr->addr2, iv32); | |
433 | tkey->rx_phase1_done = 1; | |
434 | } | |
435 | tkip_mixing_phase2(rc4key, tkey->key, tkey->rx_ttak, iv16); | |
436 | ||
437 | plen = skb->len - hdr_len - 12; | |
438 | ||
4be29701 AB |
439 | arc4_setkey(&tkey->rx_ctx_arc4, rc4key, 16); |
440 | arc4_crypt(&tkey->rx_ctx_arc4, pos, pos, plen + 4); | |
b453872c JG |
441 | |
442 | crc = ~crc32_le(~0, pos, plen); | |
443 | icv[0] = crc; | |
444 | icv[1] = crc >> 8; | |
445 | icv[2] = crc >> 16; | |
446 | icv[3] = crc >> 24; | |
447 | if (memcmp(icv, pos + plen, 4) != 0) { | |
448 | if (iv32 != tkey->rx_iv32) { | |
449 | /* Previously cached Phase1 result was already lost, so | |
450 | * it needs to be recalculated for the next packet. */ | |
451 | tkey->rx_phase1_done = 0; | |
452 | } | |
6f16bf3b | 453 | #ifdef CONFIG_LIB80211_DEBUG |
e87cc472 JP |
454 | net_dbg_ratelimited("TKIP: ICV error detected: STA=%pM\n", |
455 | hdr->addr2); | |
6f16bf3b | 456 | #endif |
b453872c JG |
457 | tkey->dot11RSNAStatsTKIPICVErrors++; |
458 | return -5; | |
459 | } | |
460 | ||
461 | /* Update real counters only after Michael MIC verification has | |
462 | * completed */ | |
463 | tkey->rx_iv32_new = iv32; | |
464 | tkey->rx_iv16_new = iv16; | |
465 | ||
466 | /* Remove IV and ICV */ | |
299af9d3 AT |
467 | memmove(skb->data + TKIP_HDR_LEN, skb->data, hdr_len); |
468 | skb_pull(skb, TKIP_HDR_LEN); | |
b453872c JG |
469 | skb_trim(skb, skb->len - 4); |
470 | ||
471 | return keyidx; | |
472 | } | |
473 | ||
d17504b1 KC |
474 | static int michael_mic(struct crypto_shash *tfm_michael, u8 *key, u8 *hdr, |
475 | u8 *data, size_t data_len, u8 *mic) | |
b453872c | 476 | { |
d17504b1 | 477 | SHASH_DESC_ON_STACK(desc, tfm_michael); |
608fb34c | 478 | int err; |
b453872c | 479 | |
5a656949 | 480 | if (tfm_michael == NULL) { |
e9c0268f | 481 | pr_warn("%s(): tfm_michael == NULL\n", __func__); |
b453872c JG |
482 | return -1; |
483 | } | |
b453872c | 484 | |
d17504b1 | 485 | desc->tfm = tfm_michael; |
d17504b1 KC |
486 | |
487 | if (crypto_shash_setkey(tfm_michael, key, 8)) | |
35058687 | 488 | return -1; |
b453872c | 489 | |
d17504b1 KC |
490 | err = crypto_shash_init(desc); |
491 | if (err) | |
492 | goto out; | |
493 | err = crypto_shash_update(desc, hdr, 16); | |
494 | if (err) | |
495 | goto out; | |
496 | err = crypto_shash_update(desc, data, data_len); | |
497 | if (err) | |
498 | goto out; | |
499 | err = crypto_shash_final(desc, mic); | |
500 | ||
501 | out: | |
502 | shash_desc_zero(desc); | |
608fb34c | 503 | return err; |
b453872c JG |
504 | } |
505 | ||
0edd5b44 | 506 | static void michael_mic_hdr(struct sk_buff *skb, u8 * hdr) |
b453872c | 507 | { |
274bfb8d | 508 | struct ieee80211_hdr *hdr11; |
b453872c | 509 | |
274bfb8d | 510 | hdr11 = (struct ieee80211_hdr *)skb->data; |
ea284152 | 511 | |
274bfb8d | 512 | switch (le16_to_cpu(hdr11->frame_control) & |
b453872c JG |
513 | (IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS)) { |
514 | case IEEE80211_FCTL_TODS: | |
0edd5b44 JG |
515 | memcpy(hdr, hdr11->addr3, ETH_ALEN); /* DA */ |
516 | memcpy(hdr + ETH_ALEN, hdr11->addr2, ETH_ALEN); /* SA */ | |
b453872c JG |
517 | break; |
518 | case IEEE80211_FCTL_FROMDS: | |
0edd5b44 JG |
519 | memcpy(hdr, hdr11->addr1, ETH_ALEN); /* DA */ |
520 | memcpy(hdr + ETH_ALEN, hdr11->addr3, ETH_ALEN); /* SA */ | |
b453872c JG |
521 | break; |
522 | case IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS: | |
0edd5b44 JG |
523 | memcpy(hdr, hdr11->addr3, ETH_ALEN); /* DA */ |
524 | memcpy(hdr + ETH_ALEN, hdr11->addr4, ETH_ALEN); /* SA */ | |
b453872c | 525 | break; |
10f3366b | 526 | default: |
0edd5b44 JG |
527 | memcpy(hdr, hdr11->addr1, ETH_ALEN); /* DA */ |
528 | memcpy(hdr + ETH_ALEN, hdr11->addr2, ETH_ALEN); /* SA */ | |
b453872c JG |
529 | break; |
530 | } | |
531 | ||
274bfb8d | 532 | if (ieee80211_is_data_qos(hdr11->frame_control)) { |
3f6ff6ba | 533 | hdr[12] = le16_to_cpu(*((__le16 *)ieee80211_get_qos_ctl(hdr11))) |
274bfb8d | 534 | & IEEE80211_QOS_CTL_TID_MASK; |
ea284152 ZY |
535 | } else |
536 | hdr[12] = 0; /* priority */ | |
537 | ||
0edd5b44 | 538 | hdr[13] = hdr[14] = hdr[15] = 0; /* reserved */ |
b453872c JG |
539 | } |
540 | ||
274bfb8d | 541 | static int lib80211_michael_mic_add(struct sk_buff *skb, int hdr_len, |
0edd5b44 | 542 | void *priv) |
b453872c | 543 | { |
274bfb8d | 544 | struct lib80211_tkip_data *tkey = priv; |
b453872c JG |
545 | u8 *pos; |
546 | ||
547 | if (skb_tailroom(skb) < 8 || skb->len < hdr_len) { | |
548 | printk(KERN_DEBUG "Invalid packet for Michael MIC add " | |
549 | "(tailroom=%d hdr_len=%d skb->len=%d)\n", | |
550 | skb_tailroom(skb), hdr_len, skb->len); | |
551 | return -1; | |
552 | } | |
553 | ||
554 | michael_mic_hdr(skb, tkey->tx_hdr); | |
555 | pos = skb_put(skb, 8); | |
5a656949 | 556 | if (michael_mic(tkey->tx_tfm_michael, &tkey->key[16], tkey->tx_hdr, |
b453872c JG |
557 | skb->data + hdr_len, skb->len - 8 - hdr_len, pos)) |
558 | return -1; | |
559 | ||
560 | return 0; | |
561 | } | |
562 | ||
274bfb8d JL |
563 | static void lib80211_michael_mic_failure(struct net_device *dev, |
564 | struct ieee80211_hdr *hdr, | |
ee34af37 | 565 | int keyidx) |
b453872c JG |
566 | { |
567 | union iwreq_data wrqu; | |
568 | struct iw_michaelmicfailure ev; | |
569 | ||
570 | /* TODO: needed parameters: count, keyid, key type, TSC */ | |
571 | memset(&ev, 0, sizeof(ev)); | |
572 | ev.flags = keyidx & IW_MICFAILURE_KEY_ID; | |
573 | if (hdr->addr1[0] & 0x01) | |
574 | ev.flags |= IW_MICFAILURE_GROUP; | |
575 | else | |
576 | ev.flags |= IW_MICFAILURE_PAIRWISE; | |
577 | ev.src_addr.sa_family = ARPHRD_ETHER; | |
578 | memcpy(ev.src_addr.sa_data, hdr->addr2, ETH_ALEN); | |
579 | memset(&wrqu, 0, sizeof(wrqu)); | |
580 | wrqu.data.length = sizeof(ev); | |
0edd5b44 | 581 | wireless_send_event(dev, IWEVMICHAELMICFAILURE, &wrqu, (char *)&ev); |
b453872c | 582 | } |
b453872c | 583 | |
274bfb8d | 584 | static int lib80211_michael_mic_verify(struct sk_buff *skb, int keyidx, |
0edd5b44 | 585 | int hdr_len, void *priv) |
b453872c | 586 | { |
274bfb8d | 587 | struct lib80211_tkip_data *tkey = priv; |
b453872c JG |
588 | u8 mic[8]; |
589 | ||
590 | if (!tkey->key_set) | |
591 | return -1; | |
592 | ||
593 | michael_mic_hdr(skb, tkey->rx_hdr); | |
5a656949 | 594 | if (michael_mic(tkey->rx_tfm_michael, &tkey->key[24], tkey->rx_hdr, |
b453872c JG |
595 | skb->data + hdr_len, skb->len - 8 - hdr_len, mic)) |
596 | return -1; | |
597 | if (memcmp(mic, skb->data + skb->len - 8, 8) != 0) { | |
274bfb8d JL |
598 | struct ieee80211_hdr *hdr; |
599 | hdr = (struct ieee80211_hdr *)skb->data; | |
b453872c | 600 | printk(KERN_DEBUG "%s: Michael MIC verification failed for " |
e174961c JB |
601 | "MSDU from %pM keyidx=%d\n", |
602 | skb->dev ? skb->dev->name : "N/A", hdr->addr2, | |
b453872c JG |
603 | keyidx); |
604 | if (skb->dev) | |
274bfb8d | 605 | lib80211_michael_mic_failure(skb->dev, hdr, keyidx); |
b453872c JG |
606 | tkey->dot11RSNAStatsTKIPLocalMICFailures++; |
607 | return -1; | |
608 | } | |
609 | ||
610 | /* Update TSC counters for RX now that the packet verification has | |
611 | * completed. */ | |
612 | tkey->rx_iv32 = tkey->rx_iv32_new; | |
613 | tkey->rx_iv16 = tkey->rx_iv16_new; | |
614 | ||
615 | skb_trim(skb, skb->len - 8); | |
616 | ||
617 | return 0; | |
618 | } | |
619 | ||
274bfb8d | 620 | static int lib80211_tkip_set_key(void *key, int len, u8 * seq, void *priv) |
b453872c | 621 | { |
274bfb8d | 622 | struct lib80211_tkip_data *tkey = priv; |
b453872c | 623 | int keyidx; |
d17504b1 | 624 | struct crypto_shash *tfm = tkey->tx_tfm_michael; |
4be29701 | 625 | struct arc4_ctx *tfm2 = &tkey->tx_ctx_arc4; |
d17504b1 | 626 | struct crypto_shash *tfm3 = tkey->rx_tfm_michael; |
4be29701 | 627 | struct arc4_ctx *tfm4 = &tkey->rx_ctx_arc4; |
b453872c JG |
628 | |
629 | keyidx = tkey->key_idx; | |
630 | memset(tkey, 0, sizeof(*tkey)); | |
631 | tkey->key_idx = keyidx; | |
5a656949 | 632 | tkey->tx_tfm_michael = tfm; |
4be29701 | 633 | tkey->tx_ctx_arc4 = *tfm2; |
5a656949 | 634 | tkey->rx_tfm_michael = tfm3; |
4be29701 | 635 | tkey->rx_ctx_arc4 = *tfm4; |
b453872c JG |
636 | if (len == TKIP_KEY_LEN) { |
637 | memcpy(tkey->key, key, TKIP_KEY_LEN); | |
638 | tkey->key_set = 1; | |
0edd5b44 | 639 | tkey->tx_iv16 = 1; /* TSC is initialized to 1 */ |
b453872c JG |
640 | if (seq) { |
641 | tkey->rx_iv32 = (seq[5] << 24) | (seq[4] << 16) | | |
0edd5b44 | 642 | (seq[3] << 8) | seq[2]; |
b453872c JG |
643 | tkey->rx_iv16 = (seq[1] << 8) | seq[0]; |
644 | } | |
645 | } else if (len == 0) | |
646 | tkey->key_set = 0; | |
647 | else | |
648 | return -1; | |
649 | ||
650 | return 0; | |
651 | } | |
652 | ||
274bfb8d | 653 | static int lib80211_tkip_get_key(void *key, int len, u8 * seq, void *priv) |
b453872c | 654 | { |
274bfb8d | 655 | struct lib80211_tkip_data *tkey = priv; |
b453872c JG |
656 | |
657 | if (len < TKIP_KEY_LEN) | |
658 | return -1; | |
659 | ||
660 | if (!tkey->key_set) | |
661 | return 0; | |
662 | memcpy(key, tkey->key, TKIP_KEY_LEN); | |
663 | ||
664 | if (seq) { | |
665 | /* Return the sequence number of the last transmitted frame. */ | |
666 | u16 iv16 = tkey->tx_iv16; | |
667 | u32 iv32 = tkey->tx_iv32; | |
668 | if (iv16 == 0) | |
669 | iv32--; | |
670 | iv16--; | |
671 | seq[0] = tkey->tx_iv16; | |
672 | seq[1] = tkey->tx_iv16 >> 8; | |
673 | seq[2] = tkey->tx_iv32; | |
674 | seq[3] = tkey->tx_iv32 >> 8; | |
675 | seq[4] = tkey->tx_iv32 >> 16; | |
676 | seq[5] = tkey->tx_iv32 >> 24; | |
677 | } | |
678 | ||
679 | return TKIP_KEY_LEN; | |
680 | } | |
681 | ||
6bbefe86 | 682 | static void lib80211_tkip_print_stats(struct seq_file *m, void *priv) |
b453872c | 683 | { |
274bfb8d | 684 | struct lib80211_tkip_data *tkip = priv; |
6bbefe86 DH |
685 | seq_printf(m, |
686 | "key[%d] alg=TKIP key_set=%d " | |
687 | "tx_pn=%02x%02x%02x%02x%02x%02x " | |
688 | "rx_pn=%02x%02x%02x%02x%02x%02x " | |
689 | "replays=%d icv_errors=%d local_mic_failures=%d\n", | |
690 | tkip->key_idx, tkip->key_set, | |
691 | (tkip->tx_iv32 >> 24) & 0xff, | |
692 | (tkip->tx_iv32 >> 16) & 0xff, | |
693 | (tkip->tx_iv32 >> 8) & 0xff, | |
694 | tkip->tx_iv32 & 0xff, | |
695 | (tkip->tx_iv16 >> 8) & 0xff, | |
696 | tkip->tx_iv16 & 0xff, | |
697 | (tkip->rx_iv32 >> 24) & 0xff, | |
698 | (tkip->rx_iv32 >> 16) & 0xff, | |
699 | (tkip->rx_iv32 >> 8) & 0xff, | |
700 | tkip->rx_iv32 & 0xff, | |
701 | (tkip->rx_iv16 >> 8) & 0xff, | |
702 | tkip->rx_iv16 & 0xff, | |
703 | tkip->dot11RSNAStatsTKIPReplays, | |
704 | tkip->dot11RSNAStatsTKIPICVErrors, | |
705 | tkip->dot11RSNAStatsTKIPLocalMICFailures); | |
b453872c JG |
706 | } |
707 | ||
274bfb8d | 708 | static struct lib80211_crypto_ops lib80211_crypt_tkip = { |
74079fdc | 709 | .name = "TKIP", |
274bfb8d JL |
710 | .init = lib80211_tkip_init, |
711 | .deinit = lib80211_tkip_deinit, | |
274bfb8d JL |
712 | .encrypt_mpdu = lib80211_tkip_encrypt, |
713 | .decrypt_mpdu = lib80211_tkip_decrypt, | |
714 | .encrypt_msdu = lib80211_michael_mic_add, | |
715 | .decrypt_msdu = lib80211_michael_mic_verify, | |
716 | .set_key = lib80211_tkip_set_key, | |
717 | .get_key = lib80211_tkip_get_key, | |
718 | .print_stats = lib80211_tkip_print_stats, | |
1264fc04 JK |
719 | .extra_mpdu_prefix_len = 4 + 4, /* IV + ExtIV */ |
720 | .extra_mpdu_postfix_len = 4, /* ICV */ | |
721 | .extra_msdu_postfix_len = 8, /* MIC */ | |
274bfb8d JL |
722 | .get_flags = lib80211_tkip_get_flags, |
723 | .set_flags = lib80211_tkip_set_flags, | |
74079fdc | 724 | .owner = THIS_MODULE, |
b453872c JG |
725 | }; |
726 | ||
274bfb8d | 727 | static int __init lib80211_crypto_tkip_init(void) |
b453872c | 728 | { |
274bfb8d | 729 | return lib80211_register_crypto_ops(&lib80211_crypt_tkip); |
b453872c JG |
730 | } |
731 | ||
274bfb8d | 732 | static void __exit lib80211_crypto_tkip_exit(void) |
b453872c | 733 | { |
274bfb8d | 734 | lib80211_unregister_crypto_ops(&lib80211_crypt_tkip); |
b453872c JG |
735 | } |
736 | ||
274bfb8d JL |
737 | module_init(lib80211_crypto_tkip_init); |
738 | module_exit(lib80211_crypto_tkip_exit); |