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GUI: Fix Tomato RAF theme for all builds. Compilation typo.
[tomato.git] / release / src-rt-6.x.4708 / linux / linux-2.6.36 / drivers / staging / rtl8192e / ieee80211 / ieee80211_crypt_ccmp.c
blob0d58c6b52bb6584c33989be304017c0738792ca1
1 /*
2 * Host AP crypt: host-based CCMP encryption implementation for Host AP driver
3 *
4 * Copyright (c) 2003-2004, Jouni Malinen <jkmaline@cc.hut.fi>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation. See README and COPYING for
9 * more details.
10 */
11
12 //#include <linux/config.h>
13 #include <linux/version.h>
14 #include <linux/module.h>
15 #include <linux/init.h>
16 #include <linux/slab.h>
17 #include <linux/random.h>
18 #include <linux/skbuff.h>
19 #include <linux/netdevice.h>
20 #include <linux/if_ether.h>
21 #include <linux/if_arp.h>
22 #include <asm/string.h>
23 #include <linux/wireless.h>
24
25 #include "ieee80211.h"
26
27 #include <linux/crypto.h>
28
29 #include <linux/scatterlist.h>
30
31 MODULE_AUTHOR("Jouni Malinen");
32 MODULE_DESCRIPTION("Host AP crypt: CCMP");
33 MODULE_LICENSE("GPL");
34
35 #ifndef OPENSUSE_SLED
36 #define OPENSUSE_SLED 0
37 #endif
38
39 #define AES_BLOCK_LEN 16
40 #define CCMP_HDR_LEN 8
41 #define CCMP_MIC_LEN 8
42 #define CCMP_TK_LEN 16
43 #define CCMP_PN_LEN 6
44
45 struct ieee80211_ccmp_data {
46 u8 key[CCMP_TK_LEN];
47 int key_set;
48
49 u8 tx_pn[CCMP_PN_LEN];
50 u8 rx_pn[CCMP_PN_LEN];
51
52 u32 dot11RSNAStatsCCMPFormatErrors;
53 u32 dot11RSNAStatsCCMPReplays;
54 u32 dot11RSNAStatsCCMPDecryptErrors;
55
56 int key_idx;
57
58 struct crypto_tfm *tfm;
59
60 /* scratch buffers for virt_to_page() (crypto API) */
61 u8 tx_b0[AES_BLOCK_LEN], tx_b[AES_BLOCK_LEN],
62 tx_e[AES_BLOCK_LEN], tx_s0[AES_BLOCK_LEN];
63 u8 rx_b0[AES_BLOCK_LEN], rx_b[AES_BLOCK_LEN], rx_a[AES_BLOCK_LEN];
64 };
65
66 void ieee80211_ccmp_aes_encrypt(struct crypto_tfm *tfm,
67 const u8 pt[16], u8 ct[16])
68 {
69 crypto_cipher_encrypt_one((void*)tfm, ct, pt);
70 }
71
72 static void * ieee80211_ccmp_init(int key_idx)
73 {
74 struct ieee80211_ccmp_data *priv;
75
76 priv = kzalloc(sizeof(*priv), GFP_ATOMIC);
77 if (priv == NULL)
78 goto fail;
79 priv->key_idx = key_idx;
80
81 priv->tfm = (void*)crypto_alloc_cipher("aes", 0, CRYPTO_ALG_ASYNC);
82 if (IS_ERR(priv->tfm)) {
83 printk(KERN_DEBUG "ieee80211_crypt_ccmp: could not allocate "
84 "crypto API aes\n");
85 priv->tfm = NULL;
86 goto fail;
87 }
88 return priv;
89
90 fail:
91 if (priv) {
92 if (priv->tfm)
93 crypto_free_cipher((void*)priv->tfm);
94 kfree(priv);
95 }
96
97 return NULL;
98 }
99
100
101 static void ieee80211_ccmp_deinit(void *priv)
102 {
103 struct ieee80211_ccmp_data *_priv = priv;
104 if (_priv && _priv->tfm)
105 crypto_free_cipher((void*)_priv->tfm);
106 kfree(priv);
107 }
108
109
110 static inline void xor_block(u8 *b, u8 *a, size_t len)
111 {
112 int i;
113 for (i = 0; i < len; i++)
114 b[i] ^= a[i];
115 }
116
117
118
119 static void ccmp_init_blocks(struct crypto_tfm *tfm,
120 struct ieee80211_hdr_4addr *hdr,
121 u8 *pn, size_t dlen, u8 *b0, u8 *auth,
122 u8 *s0)
123 {
124 u8 *pos, qc = 0;
125 size_t aad_len;
126 u16 fc;
127 int a4_included, qc_included;
128 u8 aad[2 * AES_BLOCK_LEN];
129
130 fc = le16_to_cpu(hdr->frame_ctl);
131 a4_included = ((fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) ==
132 (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS));
133 /*
134 qc_included = ((WLAN_FC_GET_TYPE(fc) == IEEE80211_FTYPE_DATA) &&
135 (WLAN_FC_GET_STYPE(fc) & 0x08));
136 */
137 // fixed by David :2006.9.6
138 qc_included = ((WLAN_FC_GET_TYPE(fc) == IEEE80211_FTYPE_DATA) &&
139 (WLAN_FC_GET_STYPE(fc) & 0x80));
140 aad_len = 22;
141 if (a4_included)
142 aad_len += 6;
143 if (qc_included) {
144 pos = (u8 *) &hdr->addr4;
145 if (a4_included)
146 pos += 6;
147 qc = *pos & 0x0f;
148 aad_len += 2;
149 }
150 /* CCM Initial Block:
151 * Flag (Include authentication header, M=3 (8-octet MIC),
152 * L=1 (2-octet Dlen))
153 * Nonce: 0x00 | A2 | PN
154 * Dlen */
155 b0[0] = 0x59;
156 b0[1] = qc;
157 memcpy(b0 + 2, hdr->addr2, ETH_ALEN);
158 memcpy(b0 + 8, pn, CCMP_PN_LEN);
159 b0[14] = (dlen >> 8) & 0xff;
160 b0[15] = dlen & 0xff;
161
162 /* AAD:
163 * FC with bits 4..6 and 11..13 masked to zero; 14 is always one
164 * A1 | A2 | A3
165 * SC with bits 4..15 (seq#) masked to zero
166 * A4 (if present)
167 * QC (if present)
168 */
169 pos = (u8 *) hdr;
170 aad[0] = 0; /* aad_len >> 8 */
171 aad[1] = aad_len & 0xff;
172 aad[2] = pos[0] & 0x8f;
173 aad[3] = pos[1] & 0xc7;
174 memcpy(aad + 4, hdr->addr1, 3 * ETH_ALEN);
175 pos = (u8 *) &hdr->seq_ctl;
176 aad[22] = pos[0] & 0x0f;
177 aad[23] = 0; /* all bits masked */
178 memset(aad + 24, 0, 8);
179 if (a4_included)
180 memcpy(aad + 24, hdr->addr4, ETH_ALEN);
181 if (qc_included) {
182 aad[a4_included ? 30 : 24] = qc;
183 /* rest of QC masked */
184 }
185
186 /* Start with the first block and AAD */
187 ieee80211_ccmp_aes_encrypt(tfm, b0, auth);
188 xor_block(auth, aad, AES_BLOCK_LEN);
189 ieee80211_ccmp_aes_encrypt(tfm, auth, auth);
190 xor_block(auth, &aad[AES_BLOCK_LEN], AES_BLOCK_LEN);
191 ieee80211_ccmp_aes_encrypt(tfm, auth, auth);
192 b0[0] &= 0x07;
193 b0[14] = b0[15] = 0;
194 ieee80211_ccmp_aes_encrypt(tfm, b0, s0);
195 }
196
197
198
199 static int ieee80211_ccmp_encrypt(struct sk_buff *skb, int hdr_len, void *priv)
200 {
201 struct ieee80211_ccmp_data *key = priv;
202 int data_len, i;
203 u8 *pos;
204 struct ieee80211_hdr_4addr *hdr;
205 cb_desc *tcb_desc = (cb_desc *)(skb->cb + MAX_DEV_ADDR_SIZE);
206
207 if (skb_headroom(skb) < CCMP_HDR_LEN ||
208 skb_tailroom(skb) < CCMP_MIC_LEN ||
209 skb->len < hdr_len)
210 return -1;
211
212 data_len = skb->len - hdr_len;
213 pos = skb_push(skb, CCMP_HDR_LEN);
214 memmove(pos, pos + CCMP_HDR_LEN, hdr_len);
215 pos += hdr_len;
216 // mic = skb_put(skb, CCMP_MIC_LEN);
217
218 i = CCMP_PN_LEN - 1;
219 while (i >= 0) {
220 key->tx_pn[i]++;
221 if (key->tx_pn[i] != 0)
222 break;
223 i--;
224 }
225
226 *pos++ = key->tx_pn[5];
227 *pos++ = key->tx_pn[4];
228 *pos++ = 0;
229 *pos++ = (key->key_idx << 6) | (1 << 5) /* Ext IV included */;
230 *pos++ = key->tx_pn[3];
231 *pos++ = key->tx_pn[2];
232 *pos++ = key->tx_pn[1];
233 *pos++ = key->tx_pn[0];
234
235
236 hdr = (struct ieee80211_hdr_4addr *) skb->data;
237 if (!tcb_desc->bHwSec)
238 {
239 int blocks, last, len;
240 u8 *mic;
241 u8 *b0 = key->tx_b0;
242 u8 *b = key->tx_b;
243 u8 *e = key->tx_e;
244 u8 *s0 = key->tx_s0;
245
246 //mic is moved to here by john
247 mic = skb_put(skb, CCMP_MIC_LEN);
248
249 ccmp_init_blocks(key->tfm, hdr, key->tx_pn, data_len, b0, b, s0);
250
251 blocks = (data_len + AES_BLOCK_LEN - 1) / AES_BLOCK_LEN;
252 last = data_len % AES_BLOCK_LEN;
253
254 for (i = 1; i <= blocks; i++) {
255 len = (i == blocks && last) ? last : AES_BLOCK_LEN;
256 /* Authentication */
257 xor_block(b, pos, len);
258 ieee80211_ccmp_aes_encrypt(key->tfm, b, b);
259 /* Encryption, with counter */
260 b0[14] = (i >> 8) & 0xff;
261 b0[15] = i & 0xff;
262 ieee80211_ccmp_aes_encrypt(key->tfm, b0, e);
263 xor_block(pos, e, len);
264 pos += len;
265 }
266
267 for (i = 0; i < CCMP_MIC_LEN; i++)
268 mic[i] = b[i] ^ s0[i];
269 }
270 return 0;
271 }
272
273
274 static int ieee80211_ccmp_decrypt(struct sk_buff *skb, int hdr_len, void *priv)
275 {
276 struct ieee80211_ccmp_data *key = priv;
277 u8 keyidx, *pos;
278 struct ieee80211_hdr_4addr *hdr;
279 cb_desc *tcb_desc = (cb_desc *)(skb->cb + MAX_DEV_ADDR_SIZE);
280 u8 pn[6];
281
282 if (skb->len < hdr_len + CCMP_HDR_LEN + CCMP_MIC_LEN) {
283 key->dot11RSNAStatsCCMPFormatErrors++;
284 return -1;
285 }
286
287 hdr = (struct ieee80211_hdr_4addr *) skb->data;
288 pos = skb->data + hdr_len;
289 keyidx = pos[3];
290 if (!(keyidx & (1 << 5))) {
291 if (net_ratelimit()) {
292 printk(KERN_DEBUG "CCMP: received packet without ExtIV"
293 " flag from %pM\n", hdr->addr2);
294 }
295 key->dot11RSNAStatsCCMPFormatErrors++;
296 return -2;
297 }
298 keyidx >>= 6;
299 if (key->key_idx != keyidx) {
300 printk(KERN_DEBUG "CCMP: RX tkey->key_idx=%d frame "
301 "keyidx=%d priv=%p\n", key->key_idx, keyidx, priv);
302 return -6;
303 }
304 if (!key->key_set) {
305 if (net_ratelimit()) {
306 printk(KERN_DEBUG "CCMP: received packet from %pM"
307 " with keyid=%d that does not have a configured"
308 " key\n", hdr->addr2, keyidx);
309 }
310 return -3;
311 }
312
313 pn[0] = pos[7];
314 pn[1] = pos[6];
315 pn[2] = pos[5];
316 pn[3] = pos[4];
317 pn[4] = pos[1];
318 pn[5] = pos[0];
319 pos += 8;
320
321 if (memcmp(pn, key->rx_pn, CCMP_PN_LEN) <= 0) {
322 if (net_ratelimit()) {
323 //printk(KERN_DEBUG "CCMP: replay detected: STA=%pM"
324 // " previous PN %pm received PN %pm\n",
325 // hdr->addr2, key->rx_pn, pn);
326 }
327 key->dot11RSNAStatsCCMPReplays++;
328 return -4;
329 }
330 if (!tcb_desc->bHwSec)
331 {
332 size_t data_len = skb->len - hdr_len - CCMP_HDR_LEN - CCMP_MIC_LEN;
333 u8 *mic = skb->data + skb->len - CCMP_MIC_LEN;
334 u8 *b0 = key->rx_b0;
335 u8 *b = key->rx_b;
336 u8 *a = key->rx_a;
337 int i, blocks, last, len;
338
339
340 ccmp_init_blocks(key->tfm, hdr, pn, data_len, b0, a, b);
341 xor_block(mic, b, CCMP_MIC_LEN);
342
343 blocks = (data_len + AES_BLOCK_LEN - 1) / AES_BLOCK_LEN;
344 last = data_len % AES_BLOCK_LEN;
345
346 for (i = 1; i <= blocks; i++) {
347 len = (i == blocks && last) ? last : AES_BLOCK_LEN;
348 /* Decrypt, with counter */
349 b0[14] = (i >> 8) & 0xff;
350 b0[15] = i & 0xff;
351 ieee80211_ccmp_aes_encrypt(key->tfm, b0, b);
352 xor_block(pos, b, len);
353 /* Authentication */
354 xor_block(a, pos, len);
355 ieee80211_ccmp_aes_encrypt(key->tfm, a, a);
356 pos += len;
357 }
358
359 if (memcmp(mic, a, CCMP_MIC_LEN) != 0) {
360 if (net_ratelimit()) {
361 printk(KERN_DEBUG "CCMP: decrypt failed: STA="
362 "%pM\n", hdr->addr2);
363 }
364 key->dot11RSNAStatsCCMPDecryptErrors++;
365 return -5;
366 }
367
368 memcpy(key->rx_pn, pn, CCMP_PN_LEN);
369 }
370 /* Remove hdr and MIC */
371 memmove(skb->data + CCMP_HDR_LEN, skb->data, hdr_len);
372 skb_pull(skb, CCMP_HDR_LEN);
373 skb_trim(skb, skb->len - CCMP_MIC_LEN);
374
375 return keyidx;
376 }
377
378
379 static int ieee80211_ccmp_set_key(void *key, int len, u8 *seq, void *priv)
380 {
381 struct ieee80211_ccmp_data *data = priv;
382 int keyidx;
383 struct crypto_tfm *tfm = data->tfm;
384
385 keyidx = data->key_idx;
386 memset(data, 0, sizeof(*data));
387 data->key_idx = keyidx;
388 data->tfm = tfm;
389 if (len == CCMP_TK_LEN) {
390 memcpy(data->key, key, CCMP_TK_LEN);
391 data->key_set = 1;
392 if (seq) {
393 data->rx_pn[0] = seq[5];
394 data->rx_pn[1] = seq[4];
395 data->rx_pn[2] = seq[3];
396 data->rx_pn[3] = seq[2];
397 data->rx_pn[4] = seq[1];
398 data->rx_pn[5] = seq[0];
399 }
400 crypto_cipher_setkey((void*)data->tfm, data->key, CCMP_TK_LEN);
401 } else if (len == 0)
402 data->key_set = 0;
403 else
404 return -1;
405
406 return 0;
407 }
408
409
410 static int ieee80211_ccmp_get_key(void *key, int len, u8 *seq, void *priv)
411 {
412 struct ieee80211_ccmp_data *data = priv;
413
414 if (len < CCMP_TK_LEN)
415 return -1;
416
417 if (!data->key_set)
418 return 0;
419 memcpy(key, data->key, CCMP_TK_LEN);
420
421 if (seq) {
422 seq[0] = data->tx_pn[5];
423 seq[1] = data->tx_pn[4];
424 seq[2] = data->tx_pn[3];
425 seq[3] = data->tx_pn[2];
426 seq[4] = data->tx_pn[1];
427 seq[5] = data->tx_pn[0];
428 }
429
430 return CCMP_TK_LEN;
431 }
432
433
434 static char * ieee80211_ccmp_print_stats(char *p, void *priv)
435 {
436 struct ieee80211_ccmp_data *ccmp = priv;
437 int i;
438
439 p += sprintf(p, "key[%d] alg=CCMP key_set=%d tx_pn=",
440 ccmp->key_idx, ccmp->key_set);
441
442 for (i = 0; i < ARRAY_SIZE(ccmp->tx_pn); i++)
443 p += sprintf(p, "%02x", ccmp->tx_pn[i]);
444
445 sprintf(p, " rx_pn=");
446 for (i = 0; i < ARRAY_SIZE(ccmp->rx_pn); i++)
447 p += sprintf(p, "%02x", ccmp->tx_pn[i]);
448
449 p += sprintf(p, " format_errors=%d replays=%d decrypt_errors=%d\n",
450 ccmp->dot11RSNAStatsCCMPFormatErrors,
451 ccmp->dot11RSNAStatsCCMPReplays,
452 ccmp->dot11RSNAStatsCCMPDecryptErrors);
453
454 return p;
455 }
456
457 void ieee80211_ccmp_null(void)
458 {
459 // printk("============>%s()\n", __FUNCTION__);
460 return;
461 }
462
463 static struct ieee80211_crypto_ops ieee80211_crypt_ccmp = {
464 .name = "CCMP",
465 .init = ieee80211_ccmp_init,
466 .deinit = ieee80211_ccmp_deinit,
467 .encrypt_mpdu = ieee80211_ccmp_encrypt,
468 .decrypt_mpdu = ieee80211_ccmp_decrypt,
469 .encrypt_msdu = NULL,
470 .decrypt_msdu = NULL,
471 .set_key = ieee80211_ccmp_set_key,
472 .get_key = ieee80211_ccmp_get_key,
473 .print_stats = ieee80211_ccmp_print_stats,
474 .extra_prefix_len = CCMP_HDR_LEN,
475 .extra_postfix_len = CCMP_MIC_LEN,
476 .owner = THIS_MODULE,
477 };
478
479
480 int __init ieee80211_crypto_ccmp_init(void)
481 {
482 return ieee80211_register_crypto_ops(&ieee80211_crypt_ccmp);
483 }
484
485
486 void ieee80211_crypto_ccmp_exit(void)
487 {
488 ieee80211_unregister_crypto_ops(&ieee80211_crypt_ccmp);
489 }
Tomato firmware and modifications.