1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* |
3 | * Host AP crypt: host-based TKIP encryption implementation for Host AP driver |
4 | * |
5 | * Copyright (c) 2003-2004, Jouni Malinen <jkmaline@cc.hut.fi> |
6 | */ |
7 | |
8 | #include <crypto/arc4.h> |
9 | #include <crypto/hash.h> |
10 | #include <linux/fips.h> |
11 | #include <linux/module.h> |
12 | #include <linux/init.h> |
13 | #include <linux/slab.h> |
14 | #include <linux/random.h> |
15 | #include <linux/skbuff.h> |
16 | #include <linux/netdevice.h> |
17 | #include <linux/if_ether.h> |
18 | #include <linux/if_arp.h> |
19 | #include <linux/string.h> |
20 | #include <linux/crc32.h> |
21 | #include <linux/etherdevice.h> |
22 | |
23 | #include "rtllib.h" |
24 | |
25 | struct rtllib_tkip_data { |
26 | #define TKIP_KEY_LEN 32 |
27 | u8 key[TKIP_KEY_LEN]; |
28 | int key_set; |
29 | |
30 | u32 tx_iv32; |
31 | u16 tx_iv16; |
32 | u16 tx_ttak[5]; |
33 | int tx_phase1_done; |
34 | |
35 | u32 rx_iv32; |
36 | u16 rx_iv16; |
37 | bool initialized; |
38 | u16 rx_ttak[5]; |
39 | int rx_phase1_done; |
40 | u32 rx_iv32_new; |
41 | u16 rx_iv16_new; |
42 | |
43 | u32 dot11RSNAStatsTKIPReplays; |
44 | u32 dot11RSNAStatsTKIPICVErrors; |
45 | u32 dot11RSNAStatsTKIPLocalMICFailures; |
46 | |
47 | int key_idx; |
48 | struct arc4_ctx rx_ctx_arc4; |
49 | struct arc4_ctx tx_ctx_arc4; |
50 | struct crypto_shash *rx_tfm_michael; |
51 | struct crypto_shash *tx_tfm_michael; |
52 | /* scratch buffers for virt_to_page() (crypto API) */ |
53 | u8 rx_hdr[16]; |
54 | u8 tx_hdr[16]; |
55 | }; |
56 | |
57 | static void *rtllib_tkip_init(int key_idx) |
58 | { |
59 | struct rtllib_tkip_data *priv; |
60 | |
61 | if (fips_enabled) |
62 | return NULL; |
63 | |
64 | priv = kzalloc(size: sizeof(*priv), GFP_ATOMIC); |
65 | if (!priv) |
66 | goto fail; |
67 | priv->key_idx = key_idx; |
68 | |
69 | priv->tx_tfm_michael = crypto_alloc_shash(alg_name: "michael_mic" , type: 0, mask: 0); |
70 | if (IS_ERR(ptr: priv->tx_tfm_michael)) { |
71 | pr_debug("Could not allocate crypto API michael_mic\n" ); |
72 | priv->tx_tfm_michael = NULL; |
73 | goto fail; |
74 | } |
75 | |
76 | priv->rx_tfm_michael = crypto_alloc_shash(alg_name: "michael_mic" , type: 0, mask: 0); |
77 | if (IS_ERR(ptr: priv->rx_tfm_michael)) { |
78 | pr_debug("Could not allocate crypto API michael_mic\n" ); |
79 | priv->rx_tfm_michael = NULL; |
80 | goto fail; |
81 | } |
82 | return priv; |
83 | |
84 | fail: |
85 | if (priv) { |
86 | crypto_free_shash(tfm: priv->tx_tfm_michael); |
87 | crypto_free_shash(tfm: priv->rx_tfm_michael); |
88 | kfree(objp: priv); |
89 | } |
90 | |
91 | return NULL; |
92 | } |
93 | |
94 | static void rtllib_tkip_deinit(void *priv) |
95 | { |
96 | struct rtllib_tkip_data *_priv = priv; |
97 | |
98 | if (_priv) { |
99 | crypto_free_shash(tfm: _priv->tx_tfm_michael); |
100 | crypto_free_shash(tfm: _priv->rx_tfm_michael); |
101 | } |
102 | kfree_sensitive(objp: priv); |
103 | } |
104 | |
105 | static inline u16 RotR1(u16 val) |
106 | { |
107 | return (val >> 1) | (val << 15); |
108 | } |
109 | |
110 | static inline u8 Lo8(u16 val) |
111 | { |
112 | return val & 0xff; |
113 | } |
114 | |
115 | static inline u8 Hi8(u16 val) |
116 | { |
117 | return val >> 8; |
118 | } |
119 | |
120 | static inline u16 Lo16(u32 val) |
121 | { |
122 | return val & 0xffff; |
123 | } |
124 | |
125 | static inline u16 Hi16(u32 val) |
126 | { |
127 | return val >> 16; |
128 | } |
129 | |
130 | static inline u16 Mk16(u8 hi, u8 lo) |
131 | { |
132 | return lo | (hi << 8); |
133 | } |
134 | |
135 | static inline u16 Mk16_le(u16 *v) |
136 | { |
137 | return *v; |
138 | } |
139 | |
140 | static const u16 Sbox[256] = { |
141 | 0xC6A5, 0xF884, 0xEE99, 0xF68D, 0xFF0D, 0xD6BD, 0xDEB1, 0x9154, |
142 | 0x6050, 0x0203, 0xCEA9, 0x567D, 0xE719, 0xB562, 0x4DE6, 0xEC9A, |
143 | 0x8F45, 0x1F9D, 0x8940, 0xFA87, 0xEF15, 0xB2EB, 0x8EC9, 0xFB0B, |
144 | 0x41EC, 0xB367, 0x5FFD, 0x45EA, 0x23BF, 0x53F7, 0xE496, 0x9B5B, |
145 | 0x75C2, 0xE11C, 0x3DAE, 0x4C6A, 0x6C5A, 0x7E41, 0xF502, 0x834F, |
146 | 0x685C, 0x51F4, 0xD134, 0xF908, 0xE293, 0xAB73, 0x6253, 0x2A3F, |
147 | 0x080C, 0x9552, 0x4665, 0x9D5E, 0x3028, 0x37A1, 0x0A0F, 0x2FB5, |
148 | 0x0E09, 0x2436, 0x1B9B, 0xDF3D, 0xCD26, 0x4E69, 0x7FCD, 0xEA9F, |
149 | 0x121B, 0x1D9E, 0x5874, 0x342E, 0x362D, 0xDCB2, 0xB4EE, 0x5BFB, |
150 | 0xA4F6, 0x764D, 0xB761, 0x7DCE, 0x527B, 0xDD3E, 0x5E71, 0x1397, |
151 | 0xA6F5, 0xB968, 0x0000, 0xC12C, 0x4060, 0xE31F, 0x79C8, 0xB6ED, |
152 | 0xD4BE, 0x8D46, 0x67D9, 0x724B, 0x94DE, 0x98D4, 0xB0E8, 0x854A, |
153 | 0xBB6B, 0xC52A, 0x4FE5, 0xED16, 0x86C5, 0x9AD7, 0x6655, 0x1194, |
154 | 0x8ACF, 0xE910, 0x0406, 0xFE81, 0xA0F0, 0x7844, 0x25BA, 0x4BE3, |
155 | 0xA2F3, 0x5DFE, 0x80C0, 0x058A, 0x3FAD, 0x21BC, 0x7048, 0xF104, |
156 | 0x63DF, 0x77C1, 0xAF75, 0x4263, 0x2030, 0xE51A, 0xFD0E, 0xBF6D, |
157 | 0x814C, 0x1814, 0x2635, 0xC32F, 0xBEE1, 0x35A2, 0x88CC, 0x2E39, |
158 | 0x9357, 0x55F2, 0xFC82, 0x7A47, 0xC8AC, 0xBAE7, 0x322B, 0xE695, |
159 | 0xC0A0, 0x1998, 0x9ED1, 0xA37F, 0x4466, 0x547E, 0x3BAB, 0x0B83, |
160 | 0x8CCA, 0xC729, 0x6BD3, 0x283C, 0xA779, 0xBCE2, 0x161D, 0xAD76, |
161 | 0xDB3B, 0x6456, 0x744E, 0x141E, 0x92DB, 0x0C0A, 0x486C, 0xB8E4, |
162 | 0x9F5D, 0xBD6E, 0x43EF, 0xC4A6, 0x39A8, 0x31A4, 0xD337, 0xF28B, |
163 | 0xD532, 0x8B43, 0x6E59, 0xDAB7, 0x018C, 0xB164, 0x9CD2, 0x49E0, |
164 | 0xD8B4, 0xACFA, 0xF307, 0xCF25, 0xCAAF, 0xF48E, 0x47E9, 0x1018, |
165 | 0x6FD5, 0xF088, 0x4A6F, 0x5C72, 0x3824, 0x57F1, 0x73C7, 0x9751, |
166 | 0xCB23, 0xA17C, 0xE89C, 0x3E21, 0x96DD, 0x61DC, 0x0D86, 0x0F85, |
167 | 0xE090, 0x7C42, 0x71C4, 0xCCAA, 0x90D8, 0x0605, 0xF701, 0x1C12, |
168 | 0xC2A3, 0x6A5F, 0xAEF9, 0x69D0, 0x1791, 0x9958, 0x3A27, 0x27B9, |
169 | 0xD938, 0xEB13, 0x2BB3, 0x2233, 0xD2BB, 0xA970, 0x0789, 0x33A7, |
170 | 0x2DB6, 0x3C22, 0x1592, 0xC920, 0x8749, 0xAAFF, 0x5078, 0xA57A, |
171 | 0x038F, 0x59F8, 0x0980, 0x1A17, 0x65DA, 0xD731, 0x84C6, 0xD0B8, |
172 | 0x82C3, 0x29B0, 0x5A77, 0x1E11, 0x7BCB, 0xA8FC, 0x6DD6, 0x2C3A, |
173 | }; |
174 | |
175 | static inline u16 _S_(u16 v) |
176 | { |
177 | u16 t = Sbox[Hi8(val: v)]; |
178 | return Sbox[Lo8(val: v)] ^ ((t << 8) | (t >> 8)); |
179 | } |
180 | |
181 | #define PHASE1_LOOP_COUNT 8 |
182 | |
183 | static void tkip_mixing_phase1(u16 *TTAK, const u8 *TK, const u8 *TA, u32 IV32) |
184 | { |
185 | int i, j; |
186 | |
187 | /* Initialize the 80-bit TTAK from TSC (IV32) and TA[0..5] */ |
188 | TTAK[0] = Lo16(val: IV32); |
189 | TTAK[1] = Hi16(val: IV32); |
190 | TTAK[2] = Mk16(hi: TA[1], lo: TA[0]); |
191 | TTAK[3] = Mk16(hi: TA[3], lo: TA[2]); |
192 | TTAK[4] = Mk16(hi: TA[5], lo: TA[4]); |
193 | |
194 | for (i = 0; i < PHASE1_LOOP_COUNT; i++) { |
195 | j = 2 * (i & 1); |
196 | TTAK[0] += _S_(v: TTAK[4] ^ Mk16(hi: TK[1 + j], lo: TK[0 + j])); |
197 | TTAK[1] += _S_(v: TTAK[0] ^ Mk16(hi: TK[5 + j], lo: TK[4 + j])); |
198 | TTAK[2] += _S_(v: TTAK[1] ^ Mk16(hi: TK[9 + j], lo: TK[8 + j])); |
199 | TTAK[3] += _S_(v: TTAK[2] ^ Mk16(hi: TK[13 + j], lo: TK[12 + j])); |
200 | TTAK[4] += _S_(v: TTAK[3] ^ Mk16(hi: TK[1 + j], lo: TK[0 + j])) + i; |
201 | } |
202 | } |
203 | |
204 | static void tkip_mixing_phase2(u8 *WEPSeed, const u8 *TK, const u16 *TTAK, |
205 | u16 IV16) |
206 | { |
207 | /* Make temporary area overlap WEP seed so that the final copy can be |
208 | * avoided on little endian hosts. |
209 | */ |
210 | u16 *PPK = (u16 *)&WEPSeed[4]; |
211 | |
212 | /* Step 1 - make copy of TTAK and bring in TSC */ |
213 | PPK[0] = TTAK[0]; |
214 | PPK[1] = TTAK[1]; |
215 | PPK[2] = TTAK[2]; |
216 | PPK[3] = TTAK[3]; |
217 | PPK[4] = TTAK[4]; |
218 | PPK[5] = TTAK[4] + IV16; |
219 | |
220 | /* Step 2 - 96-bit bijective mixing using S-box */ |
221 | PPK[0] += _S_(v: PPK[5] ^ Mk16_le(v: (u16 *)&TK[0])); |
222 | PPK[1] += _S_(v: PPK[0] ^ Mk16_le(v: (u16 *)&TK[2])); |
223 | PPK[2] += _S_(v: PPK[1] ^ Mk16_le(v: (u16 *)&TK[4])); |
224 | PPK[3] += _S_(v: PPK[2] ^ Mk16_le(v: (u16 *)&TK[6])); |
225 | PPK[4] += _S_(v: PPK[3] ^ Mk16_le(v: (u16 *)&TK[8])); |
226 | PPK[5] += _S_(v: PPK[4] ^ Mk16_le(v: (u16 *)&TK[10])); |
227 | |
228 | PPK[0] += RotR1(val: PPK[5] ^ Mk16_le(v: (u16 *)&TK[12])); |
229 | PPK[1] += RotR1(val: PPK[0] ^ Mk16_le(v: (u16 *)&TK[14])); |
230 | PPK[2] += RotR1(val: PPK[1]); |
231 | PPK[3] += RotR1(val: PPK[2]); |
232 | PPK[4] += RotR1(val: PPK[3]); |
233 | PPK[5] += RotR1(val: PPK[4]); |
234 | |
235 | /* Step 3 - bring in last of TK bits, assign 24-bit WEP IV value |
236 | * WEPSeed[0..2] is transmitted as WEP IV |
237 | */ |
238 | WEPSeed[0] = Hi8(val: IV16); |
239 | WEPSeed[1] = (Hi8(val: IV16) | 0x20) & 0x7F; |
240 | WEPSeed[2] = Lo8(val: IV16); |
241 | WEPSeed[3] = Lo8(val: (PPK[5] ^ Mk16_le(v: (u16 *)&TK[0])) >> 1); |
242 | |
243 | #ifdef __BIG_ENDIAN |
244 | { |
245 | int i; |
246 | |
247 | for (i = 0; i < 6; i++) |
248 | PPK[i] = (PPK[i] << 8) | (PPK[i] >> 8); |
249 | } |
250 | #endif |
251 | } |
252 | |
253 | static int rtllib_tkip_encrypt(struct sk_buff *skb, int hdr_len, void *priv) |
254 | { |
255 | struct rtllib_tkip_data *tkey = priv; |
256 | int len; |
257 | u8 *pos; |
258 | struct ieee80211_hdr *hdr; |
259 | struct cb_desc *tcb_desc = (struct cb_desc *)(skb->cb + |
260 | MAX_DEV_ADDR_SIZE); |
261 | int ret = 0; |
262 | u8 rc4key[16], *icv; |
263 | u32 crc; |
264 | |
265 | if (skb_headroom(skb) < 8 || skb_tailroom(skb) < 4 || |
266 | skb->len < hdr_len) |
267 | return -1; |
268 | |
269 | hdr = (struct ieee80211_hdr *)skb->data; |
270 | |
271 | if (!tcb_desc->bHwSec) { |
272 | if (!tkey->tx_phase1_done) { |
273 | tkip_mixing_phase1(TTAK: tkey->tx_ttak, TK: tkey->key, TA: hdr->addr2, |
274 | IV32: tkey->tx_iv32); |
275 | tkey->tx_phase1_done = 1; |
276 | } |
277 | tkip_mixing_phase2(WEPSeed: rc4key, TK: tkey->key, TTAK: tkey->tx_ttak, |
278 | IV16: tkey->tx_iv16); |
279 | } else { |
280 | tkey->tx_phase1_done = 1; |
281 | } |
282 | |
283 | len = skb->len - hdr_len; |
284 | pos = skb_push(skb, len: 8); |
285 | memmove(pos, pos + 8, hdr_len); |
286 | pos += hdr_len; |
287 | |
288 | if (tcb_desc->bHwSec) { |
289 | *pos++ = Hi8(val: tkey->tx_iv16); |
290 | *pos++ = (Hi8(val: tkey->tx_iv16) | 0x20) & 0x7F; |
291 | *pos++ = Lo8(val: tkey->tx_iv16); |
292 | } else { |
293 | *pos++ = rc4key[0]; |
294 | *pos++ = rc4key[1]; |
295 | *pos++ = rc4key[2]; |
296 | } |
297 | |
298 | *pos++ = (tkey->key_idx << 6) | (1 << 5) /* Ext IV included */; |
299 | *pos++ = tkey->tx_iv32 & 0xff; |
300 | *pos++ = (tkey->tx_iv32 >> 8) & 0xff; |
301 | *pos++ = (tkey->tx_iv32 >> 16) & 0xff; |
302 | *pos++ = (tkey->tx_iv32 >> 24) & 0xff; |
303 | |
304 | if (!tcb_desc->bHwSec) { |
305 | icv = skb_put(skb, len: 4); |
306 | crc = ~crc32_le(crc: ~0, p: pos, len); |
307 | icv[0] = crc; |
308 | icv[1] = crc >> 8; |
309 | icv[2] = crc >> 16; |
310 | icv[3] = crc >> 24; |
311 | |
312 | arc4_setkey(ctx: &tkey->tx_ctx_arc4, in_key: rc4key, key_len: 16); |
313 | arc4_crypt(ctx: &tkey->tx_ctx_arc4, out: pos, in: pos, len: len + 4); |
314 | } |
315 | |
316 | tkey->tx_iv16++; |
317 | if (tkey->tx_iv16 == 0) { |
318 | tkey->tx_phase1_done = 0; |
319 | tkey->tx_iv32++; |
320 | } |
321 | |
322 | if (!tcb_desc->bHwSec) |
323 | return ret; |
324 | return 0; |
325 | } |
326 | |
327 | static int rtllib_tkip_decrypt(struct sk_buff *skb, int hdr_len, void *priv) |
328 | { |
329 | struct rtllib_tkip_data *tkey = priv; |
330 | u8 keyidx, *pos; |
331 | u32 iv32; |
332 | u16 iv16; |
333 | struct ieee80211_hdr *hdr; |
334 | struct cb_desc *tcb_desc = (struct cb_desc *)(skb->cb + |
335 | MAX_DEV_ADDR_SIZE); |
336 | u8 rc4key[16]; |
337 | u8 icv[4]; |
338 | u32 crc; |
339 | int plen; |
340 | |
341 | if (skb->len < hdr_len + 8 + 4) |
342 | return -1; |
343 | |
344 | hdr = (struct ieee80211_hdr *)skb->data; |
345 | pos = skb->data + hdr_len; |
346 | keyidx = pos[3]; |
347 | if (!(keyidx & (1 << 5))) { |
348 | if (net_ratelimit()) { |
349 | netdev_dbg(skb->dev, |
350 | "Received packet without ExtIV flag from %pM\n" , |
351 | hdr->addr2); |
352 | } |
353 | return -2; |
354 | } |
355 | keyidx >>= 6; |
356 | if (tkey->key_idx != keyidx) { |
357 | netdev_dbg(skb->dev, |
358 | "RX tkey->key_idx=%d frame keyidx=%d priv=%p\n" , |
359 | tkey->key_idx, keyidx, priv); |
360 | return -6; |
361 | } |
362 | if (!tkey->key_set) { |
363 | if (net_ratelimit()) { |
364 | netdev_dbg(skb->dev, |
365 | "Received packet from %pM with keyid=%d that does not have a configured key\n" , |
366 | hdr->addr2, keyidx); |
367 | } |
368 | return -3; |
369 | } |
370 | iv16 = (pos[0] << 8) | pos[2]; |
371 | iv32 = pos[4] | (pos[5] << 8) | (pos[6] << 16) | (pos[7] << 24); |
372 | pos += 8; |
373 | |
374 | if (!tcb_desc->bHwSec || (skb->cb[0] == 1)) { |
375 | if ((iv32 < tkey->rx_iv32 || |
376 | (iv32 == tkey->rx_iv32 && iv16 <= tkey->rx_iv16)) && |
377 | tkey->initialized) { |
378 | if (net_ratelimit()) { |
379 | netdev_dbg(skb->dev, |
380 | "Replay detected: STA= %pM previous TSC %08x%04x received TSC %08x%04x\n" , |
381 | hdr->addr2, tkey->rx_iv32, |
382 | tkey->rx_iv16, iv32, iv16); |
383 | } |
384 | tkey->dot11RSNAStatsTKIPReplays++; |
385 | return -4; |
386 | } |
387 | tkey->initialized = true; |
388 | |
389 | if (iv32 != tkey->rx_iv32 || !tkey->rx_phase1_done) { |
390 | tkip_mixing_phase1(TTAK: tkey->rx_ttak, TK: tkey->key, |
391 | TA: hdr->addr2, IV32: iv32); |
392 | tkey->rx_phase1_done = 1; |
393 | } |
394 | tkip_mixing_phase2(WEPSeed: rc4key, TK: tkey->key, TTAK: tkey->rx_ttak, IV16: iv16); |
395 | |
396 | plen = skb->len - hdr_len - 12; |
397 | |
398 | arc4_setkey(ctx: &tkey->rx_ctx_arc4, in_key: rc4key, key_len: 16); |
399 | arc4_crypt(ctx: &tkey->rx_ctx_arc4, out: pos, in: pos, len: plen + 4); |
400 | |
401 | crc = ~crc32_le(crc: ~0, p: pos, len: plen); |
402 | icv[0] = crc; |
403 | icv[1] = crc >> 8; |
404 | icv[2] = crc >> 16; |
405 | icv[3] = crc >> 24; |
406 | |
407 | if (memcmp(p: icv, q: pos + plen, size: 4) != 0) { |
408 | if (iv32 != tkey->rx_iv32) { |
409 | /* Previously cached Phase1 result was already |
410 | * lost, so it needs to be recalculated for the |
411 | * next packet. |
412 | */ |
413 | tkey->rx_phase1_done = 0; |
414 | } |
415 | if (net_ratelimit()) { |
416 | netdev_dbg(skb->dev, |
417 | "ICV error detected: STA= %pM\n" , |
418 | hdr->addr2); |
419 | } |
420 | tkey->dot11RSNAStatsTKIPICVErrors++; |
421 | return -5; |
422 | } |
423 | } |
424 | |
425 | /* Update real counters only after Michael MIC verification has |
426 | * completed |
427 | */ |
428 | tkey->rx_iv32_new = iv32; |
429 | tkey->rx_iv16_new = iv16; |
430 | |
431 | /* Remove IV and ICV */ |
432 | memmove(skb->data + 8, skb->data, hdr_len); |
433 | skb_pull(skb, len: 8); |
434 | skb_trim(skb, len: skb->len - 4); |
435 | |
436 | return keyidx; |
437 | } |
438 | |
439 | static int michael_mic(struct crypto_shash *tfm_michael, u8 *key, u8 *hdr, |
440 | u8 *data, size_t data_len, u8 *mic) |
441 | { |
442 | SHASH_DESC_ON_STACK(desc, tfm_michael); |
443 | int err; |
444 | |
445 | desc->tfm = tfm_michael; |
446 | |
447 | if (crypto_shash_setkey(tfm: tfm_michael, key, keylen: 8)) |
448 | return -1; |
449 | |
450 | err = crypto_shash_init(desc); |
451 | if (err) |
452 | goto out; |
453 | err = crypto_shash_update(desc, data: hdr, len: 16); |
454 | if (err) |
455 | goto out; |
456 | err = crypto_shash_update(desc, data, len: data_len); |
457 | if (err) |
458 | goto out; |
459 | err = crypto_shash_final(desc, out: mic); |
460 | |
461 | out: |
462 | shash_desc_zero(desc); |
463 | return err; |
464 | } |
465 | |
466 | static void michael_mic_hdr(struct sk_buff *skb, u8 *hdr) |
467 | { |
468 | struct ieee80211_hdr *hdr11; |
469 | |
470 | hdr11 = (struct ieee80211_hdr *)skb->data; |
471 | switch (le16_to_cpu(hdr11->frame_control) & |
472 | (IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS)) { |
473 | case IEEE80211_FCTL_TODS: |
474 | ether_addr_copy(dst: hdr, src: hdr11->addr3); /* DA */ |
475 | ether_addr_copy(dst: hdr + ETH_ALEN, src: hdr11->addr2); /* SA */ |
476 | break; |
477 | case IEEE80211_FCTL_FROMDS: |
478 | ether_addr_copy(dst: hdr, src: hdr11->addr1); /* DA */ |
479 | ether_addr_copy(dst: hdr + ETH_ALEN, src: hdr11->addr3); /* SA */ |
480 | break; |
481 | case IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS: |
482 | ether_addr_copy(dst: hdr, src: hdr11->addr3); /* DA */ |
483 | ether_addr_copy(dst: hdr + ETH_ALEN, src: hdr11->addr4); /* SA */ |
484 | break; |
485 | case 0: |
486 | ether_addr_copy(dst: hdr, src: hdr11->addr1); /* DA */ |
487 | ether_addr_copy(dst: hdr + ETH_ALEN, src: hdr11->addr2); /* SA */ |
488 | break; |
489 | } |
490 | |
491 | /* priority */ |
492 | hdr[12] = 0; |
493 | |
494 | /* reserved */ |
495 | hdr[13] = 0; |
496 | hdr[14] = 0; |
497 | hdr[15] = 0; |
498 | } |
499 | |
500 | static int rtllib_michael_mic_add(struct sk_buff *skb, int hdr_len, void *priv) |
501 | { |
502 | struct rtllib_tkip_data *tkey = priv; |
503 | u8 *pos; |
504 | struct ieee80211_hdr *hdr; |
505 | |
506 | hdr = (struct ieee80211_hdr *)skb->data; |
507 | |
508 | if (skb_tailroom(skb) < 8 || skb->len < hdr_len) { |
509 | netdev_dbg(skb->dev, |
510 | "Invalid packet for Michael MIC add (tailroom=%d hdr_len=%d skb->len=%d)\n" , |
511 | skb_tailroom(skb), hdr_len, skb->len); |
512 | return -1; |
513 | } |
514 | |
515 | michael_mic_hdr(skb, hdr: tkey->tx_hdr); |
516 | |
517 | if (RTLLIB_QOS_HAS_SEQ(le16_to_cpu(hdr->frame_control))) |
518 | tkey->tx_hdr[12] = *(skb->data + hdr_len - 2) & 0x07; |
519 | pos = skb_put(skb, len: 8); |
520 | if (michael_mic(tfm_michael: tkey->tx_tfm_michael, key: &tkey->key[16], hdr: tkey->tx_hdr, |
521 | data: skb->data + hdr_len, data_len: skb->len - 8 - hdr_len, mic: pos)) |
522 | return -1; |
523 | |
524 | return 0; |
525 | } |
526 | |
527 | static void rtllib_michael_mic_failure(struct net_device *dev, |
528 | struct ieee80211_hdr *hdr, |
529 | int keyidx) |
530 | { |
531 | union iwreq_data wrqu; |
532 | struct iw_michaelmicfailure ev; |
533 | |
534 | /* TODO: needed parameters: count, keyid, key type, TSC */ |
535 | memset(&ev, 0, sizeof(ev)); |
536 | ev.flags = keyidx & IW_MICFAILURE_KEY_ID; |
537 | if (hdr->addr1[0] & 0x01) |
538 | ev.flags |= IW_MICFAILURE_GROUP; |
539 | else |
540 | ev.flags |= IW_MICFAILURE_PAIRWISE; |
541 | ev.src_addr.sa_family = ARPHRD_ETHER; |
542 | ether_addr_copy(dst: ev.src_addr.sa_data, src: hdr->addr2); |
543 | memset(&wrqu, 0, sizeof(wrqu)); |
544 | wrqu.data.length = sizeof(ev); |
545 | wireless_send_event(dev, IWEVMICHAELMICFAILURE, wrqu: &wrqu, extra: (char *)&ev); |
546 | } |
547 | |
548 | static int rtllib_michael_mic_verify(struct sk_buff *skb, int keyidx, |
549 | int hdr_len, void *priv) |
550 | { |
551 | struct rtllib_tkip_data *tkey = priv; |
552 | u8 mic[8]; |
553 | struct ieee80211_hdr *hdr; |
554 | |
555 | hdr = (struct ieee80211_hdr *)skb->data; |
556 | |
557 | if (!tkey->key_set) |
558 | return -1; |
559 | |
560 | michael_mic_hdr(skb, hdr: tkey->rx_hdr); |
561 | if (RTLLIB_QOS_HAS_SEQ(le16_to_cpu(hdr->frame_control))) |
562 | tkey->rx_hdr[12] = *(skb->data + hdr_len - 2) & 0x07; |
563 | |
564 | if (michael_mic(tfm_michael: tkey->rx_tfm_michael, key: &tkey->key[24], hdr: tkey->rx_hdr, |
565 | data: skb->data + hdr_len, data_len: skb->len - 8 - hdr_len, mic)) |
566 | return -1; |
567 | |
568 | if (memcmp(p: mic, q: skb->data + skb->len - 8, size: 8) != 0) { |
569 | struct ieee80211_hdr *hdr; |
570 | |
571 | hdr = (struct ieee80211_hdr *)skb->data; |
572 | netdev_dbg(skb->dev, |
573 | "Michael MIC verification failed for MSDU from %pM keyidx=%d\n" , |
574 | hdr->addr2, keyidx); |
575 | netdev_dbg(skb->dev, "%d\n" , |
576 | memcmp(mic, skb->data + skb->len - 8, 8) != 0); |
577 | if (skb->dev) { |
578 | pr_info("skb->dev != NULL\n" ); |
579 | rtllib_michael_mic_failure(dev: skb->dev, hdr, keyidx); |
580 | } |
581 | tkey->dot11RSNAStatsTKIPLocalMICFailures++; |
582 | return -1; |
583 | } |
584 | |
585 | /* Update TSC counters for RX now that the packet verification has |
586 | * completed. |
587 | */ |
588 | tkey->rx_iv32 = tkey->rx_iv32_new; |
589 | tkey->rx_iv16 = tkey->rx_iv16_new; |
590 | |
591 | skb_trim(skb, len: skb->len - 8); |
592 | |
593 | return 0; |
594 | } |
595 | |
596 | static int rtllib_tkip_set_key(void *key, int len, u8 *seq, void *priv) |
597 | { |
598 | struct rtllib_tkip_data *tkey = priv; |
599 | int keyidx; |
600 | struct crypto_shash *tfm = tkey->tx_tfm_michael; |
601 | struct crypto_shash *tfm3 = tkey->rx_tfm_michael; |
602 | |
603 | keyidx = tkey->key_idx; |
604 | memset(tkey, 0, sizeof(*tkey)); |
605 | tkey->key_idx = keyidx; |
606 | tkey->tx_tfm_michael = tfm; |
607 | tkey->rx_tfm_michael = tfm3; |
608 | |
609 | if (len == TKIP_KEY_LEN) { |
610 | memcpy(tkey->key, key, TKIP_KEY_LEN); |
611 | tkey->key_set = 1; |
612 | tkey->tx_iv16 = 1; /* TSC is initialized to 1 */ |
613 | if (seq) { |
614 | tkey->rx_iv32 = (seq[5] << 24) | (seq[4] << 16) | |
615 | (seq[3] << 8) | seq[2]; |
616 | tkey->rx_iv16 = (seq[1] << 8) | seq[0]; |
617 | } |
618 | } else if (len == 0) { |
619 | tkey->key_set = 0; |
620 | } else { |
621 | return -1; |
622 | } |
623 | |
624 | return 0; |
625 | } |
626 | |
627 | static int rtllib_tkip_get_key(void *key, int len, u8 *seq, void *priv) |
628 | { |
629 | struct rtllib_tkip_data *tkey = priv; |
630 | |
631 | if (len < TKIP_KEY_LEN) |
632 | return -1; |
633 | |
634 | if (!tkey->key_set) |
635 | return 0; |
636 | memcpy(key, tkey->key, TKIP_KEY_LEN); |
637 | |
638 | if (seq) { |
639 | /* Return the sequence number of the last transmitted frame. */ |
640 | u16 iv16 = tkey->tx_iv16; |
641 | u32 iv32 = tkey->tx_iv32; |
642 | |
643 | if (iv16 == 0) |
644 | iv32--; |
645 | iv16--; |
646 | seq[0] = tkey->tx_iv16; |
647 | seq[1] = tkey->tx_iv16 >> 8; |
648 | seq[2] = tkey->tx_iv32; |
649 | seq[3] = tkey->tx_iv32 >> 8; |
650 | seq[4] = tkey->tx_iv32 >> 16; |
651 | seq[5] = tkey->tx_iv32 >> 24; |
652 | } |
653 | |
654 | return TKIP_KEY_LEN; |
655 | } |
656 | |
657 | static void rtllib_tkip_print_stats(struct seq_file *m, void *priv) |
658 | { |
659 | struct rtllib_tkip_data *tkip = priv; |
660 | |
661 | seq_printf(m, |
662 | fmt: "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" , |
663 | tkip->key_idx, tkip->key_set, |
664 | (tkip->tx_iv32 >> 24) & 0xff, |
665 | (tkip->tx_iv32 >> 16) & 0xff, |
666 | (tkip->tx_iv32 >> 8) & 0xff, |
667 | tkip->tx_iv32 & 0xff, |
668 | (tkip->tx_iv16 >> 8) & 0xff, |
669 | tkip->tx_iv16 & 0xff, |
670 | (tkip->rx_iv32 >> 24) & 0xff, |
671 | (tkip->rx_iv32 >> 16) & 0xff, |
672 | (tkip->rx_iv32 >> 8) & 0xff, |
673 | tkip->rx_iv32 & 0xff, |
674 | (tkip->rx_iv16 >> 8) & 0xff, |
675 | tkip->rx_iv16 & 0xff, |
676 | tkip->dot11RSNAStatsTKIPReplays, |
677 | tkip->dot11RSNAStatsTKIPICVErrors, |
678 | tkip->dot11RSNAStatsTKIPLocalMICFailures); |
679 | } |
680 | |
681 | static struct lib80211_crypto_ops rtllib_crypt_tkip = { |
682 | .name = "R-TKIP" , |
683 | .init = rtllib_tkip_init, |
684 | .deinit = rtllib_tkip_deinit, |
685 | .encrypt_mpdu = rtllib_tkip_encrypt, |
686 | .decrypt_mpdu = rtllib_tkip_decrypt, |
687 | .encrypt_msdu = rtllib_michael_mic_add, |
688 | .decrypt_msdu = rtllib_michael_mic_verify, |
689 | .set_key = rtllib_tkip_set_key, |
690 | .get_key = rtllib_tkip_get_key, |
691 | .print_stats = rtllib_tkip_print_stats, |
692 | .extra_mpdu_prefix_len = 4 + 4, /* IV + ExtIV */ |
693 | .extra_mpdu_postfix_len = 4, /* ICV */ |
694 | .extra_msdu_postfix_len = 8, /* MIC */ |
695 | .owner = THIS_MODULE, |
696 | }; |
697 | |
698 | static int __init rtllib_crypto_tkip_init(void) |
699 | { |
700 | return lib80211_register_crypto_ops(ops: &rtllib_crypt_tkip); |
701 | } |
702 | |
703 | static void __exit rtllib_crypto_tkip_exit(void) |
704 | { |
705 | lib80211_unregister_crypto_ops(ops: &rtllib_crypt_tkip); |
706 | } |
707 | |
708 | module_init(rtllib_crypto_tkip_init); |
709 | module_exit(rtllib_crypto_tkip_exit); |
710 | |
711 | MODULE_LICENSE("GPL" ); |
712 | |