summaryrefslogtreecommitdiff
path: root/target/linux/generic/files/crypto/ocf/cryptocteon/cryptocteon.c
blob: e084c6b05777f33f843e66a7b6473b064be5318e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
/*
 * Octeon Crypto for OCF
 *
 * Written by David McCullough <david_mccullough@mcafee.com>
 * Copyright (C) 2009-2010 David McCullough
 *
 * LICENSE TERMS
 *
 * The free distribution and use of this software in both source and binary
 * form is allowed (with or without changes) provided that:
 *
 *   1. distributions of this source code include the above copyright
 *      notice, this list of conditions and the following disclaimer;
 *
 *   2. distributions in binary form include the above copyright
 *      notice, this list of conditions and the following disclaimer
 *      in the documentation and/or other associated materials;
 *
 *   3. the copyright holder's name is not used to endorse products
 *      built using this software without specific written permission.
 *
 * DISCLAIMER
 *
 * This software is provided 'as is' with no explicit or implied warranties
 * in respect of its properties, including, but not limited to, correctness
 * and/or fitness for purpose.
 * ---------------------------------------------------------------------------
 */

#include <linux/version.h>
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,38) && !defined(AUTOCONF_INCLUDED)
#include <linux/config.h>
#endif
#include <linux/module.h>
#include <linux/init.h>
#include <linux/list.h>
#include <linux/slab.h>
#include <linux/sched.h>
#include <linux/wait.h>
#include <linux/crypto.h>
#include <linux/mm.h>
#include <linux/skbuff.h>
#include <linux/random.h>
#include <linux/scatterlist.h>

#include <cryptodev.h>
#include <uio.h>

struct {
	softc_device_decl	sc_dev;
} octo_softc;

#define offset_in_page(p) ((unsigned long)(p) & ~PAGE_MASK)

struct octo_sess {
	int					 octo_encalg;
	#define MAX_CIPHER_KEYLEN	64
	char				 octo_enckey[MAX_CIPHER_KEYLEN];
	int					 octo_encklen;

	int					 octo_macalg;
	#define MAX_HASH_KEYLEN	64
	char				 octo_mackey[MAX_HASH_KEYLEN];
	int					 octo_macklen;
	int					 octo_mackey_set;

	int					 octo_mlen;
	int					 octo_ivsize;

	int					(*octo_encrypt)(struct octo_sess *od,
	                      struct scatterlist *sg, int sg_len,
						  int auth_off, int auth_len,
						  int crypt_off, int crypt_len,
						  int icv_off, uint8_t *ivp);
	int					(*octo_decrypt)(struct octo_sess *od,
	                      struct scatterlist *sg, int sg_len,
						  int auth_off, int auth_len,
						  int crypt_off, int crypt_len,
						  int icv_off, uint8_t *ivp);

	uint64_t			 octo_hminner[3];
	uint64_t			 octo_hmouter[3];
};

int32_t octo_id = -1;
module_param(octo_id, int, 0444);
MODULE_PARM_DESC(octo_id, "Read-Only OCF ID for cryptocteon driver");

static struct octo_sess **octo_sessions = NULL;
static u_int32_t octo_sesnum = 0;

static	int octo_process(device_t, struct cryptop *, int);
static	int octo_newsession(device_t, u_int32_t *, struct cryptoini *);
static	int octo_freesession(device_t, u_int64_t);

static device_method_t octo_methods = {
	/* crypto device methods */
	DEVMETHOD(cryptodev_newsession,	octo_newsession),
	DEVMETHOD(cryptodev_freesession,octo_freesession),
	DEVMETHOD(cryptodev_process,	octo_process),
};

#define debug octo_debug
int octo_debug = 0;
module_param(octo_debug, int, 0644);
MODULE_PARM_DESC(octo_debug, "Enable debug");


#include "cavium_crypto.c"


/*
 * Generate a new octo session.  We artifically limit it to a single
 * hash/cipher or hash-cipher combo just to make it easier, most callers
 * do not expect more than this anyway.
 */
static int
octo_newsession(device_t dev, u_int32_t *sid, struct cryptoini *cri)
{
	struct cryptoini *c, *encini = NULL, *macini = NULL;
	struct octo_sess **ocd;
	int i;

	dprintk("%s()\n", __FUNCTION__);
	if (sid == NULL || cri == NULL) {
		dprintk("%s,%d - EINVAL\n", __FILE__, __LINE__);
		return EINVAL;
	}

	/*
	 * To keep it simple, we only handle hash, cipher or hash/cipher in a
	 * session,  you cannot currently do multiple ciphers/hashes in one
	 * session even though it would be possibel to code this driver to
	 * handle it.
	 */
	for (i = 0, c = cri; c && i < 2; i++) {
		if (c->cri_alg == CRYPTO_MD5_HMAC ||
				c->cri_alg == CRYPTO_SHA1_HMAC ||
				c->cri_alg == CRYPTO_NULL_HMAC) {
			if (macini) {
				break;
			}
			macini = c;
		}
		if (c->cri_alg == CRYPTO_DES_CBC ||
				c->cri_alg == CRYPTO_3DES_CBC ||
				c->cri_alg == CRYPTO_AES_CBC ||
				c->cri_alg == CRYPTO_NULL_CBC) {
			if (encini) {
				break;
			}
			encini = c;
		}
		c = c->cri_next;
	}
	if (!macini && !encini) {
		dprintk("%s,%d - EINVAL bad cipher/hash or combination\n",
				__FILE__, __LINE__);
		return EINVAL;
	}
	if (c) {
		dprintk("%s,%d - EINVAL cannot handle chained cipher/hash combos\n",
				__FILE__, __LINE__);
		return EINVAL;
	}

	/*
	 * So we have something we can do, lets setup the session
	 */

	if (octo_sessions) {
		for (i = 1; i < octo_sesnum; i++)
			if (octo_sessions[i] == NULL)
				break;
	} else
		i = 1;		/* NB: to silence compiler warning */

	if (octo_sessions == NULL || i == octo_sesnum) {
		if (octo_sessions == NULL) {
			i = 1; /* We leave octo_sessions[0] empty */
			octo_sesnum = CRYPTO_SW_SESSIONS;
		} else
			octo_sesnum *= 2;

		ocd = kmalloc(octo_sesnum * sizeof(struct octo_sess *), SLAB_ATOMIC);
		if (ocd == NULL) {
			/* Reset session number */
			if (octo_sesnum == CRYPTO_SW_SESSIONS)
				octo_sesnum = 0;
			else
				octo_sesnum /= 2;
			dprintk("%s,%d: ENOBUFS\n", __FILE__, __LINE__);
			return ENOBUFS;
		}
		memset(ocd, 0, octo_sesnum * sizeof(struct octo_sess *));

		/* Copy existing sessions */
		if (octo_sessions) {
			memcpy(ocd, octo_sessions,
			    (octo_sesnum / 2) * sizeof(struct octo_sess *));
			kfree(octo_sessions);
		}

		octo_sessions = ocd;
	}

	ocd = &octo_sessions[i];
	*sid = i;


	*ocd = (struct octo_sess *) kmalloc(sizeof(struct octo_sess), SLAB_ATOMIC);
	if (*ocd == NULL) {
		octo_freesession(NULL, i);
		dprintk("%s,%d: ENOBUFS\n", __FILE__, __LINE__);
		return ENOBUFS;
	}
	memset(*ocd, 0, sizeof(struct octo_sess));

	if (encini && encini->cri_key) {
		(*ocd)->octo_encklen = (encini->cri_klen + 7) / 8;
		memcpy((*ocd)->octo_enckey, encini->cri_key, (*ocd)->octo_encklen);
	}

	if (macini && macini->cri_key) {
		(*ocd)->octo_macklen = (macini->cri_klen + 7) / 8;
		memcpy((*ocd)->octo_mackey, macini->cri_key, (*ocd)->octo_macklen);
	}

	(*ocd)->octo_mlen = 0;
	if (encini && encini->cri_mlen)
		(*ocd)->octo_mlen = encini->cri_mlen;
	else if (macini && macini->cri_mlen)
		(*ocd)->octo_mlen = macini->cri_mlen;
	else
		(*ocd)->octo_mlen = 12;

	/*
	 * point c at the enc if it exists, otherwise the mac
	 */
	c = encini ? encini : macini;

	switch (c->cri_alg) {
	case CRYPTO_DES_CBC:
	case CRYPTO_3DES_CBC:
		(*ocd)->octo_ivsize  = 8;
		switch (macini ? macini->cri_alg : -1) {
		case CRYPTO_MD5_HMAC:
			(*ocd)->octo_encrypt = octo_des_cbc_md5_encrypt;
			(*ocd)->octo_decrypt = octo_des_cbc_md5_decrypt;
			octo_calc_hash(0, macini->cri_key, (*ocd)->octo_hminner,
					(*ocd)->octo_hmouter);
			break;
		case CRYPTO_SHA1_HMAC:
			(*ocd)->octo_encrypt = octo_des_cbc_sha1_encrypt;
			(*ocd)->octo_decrypt = octo_des_cbc_sha1_decrypt;
			octo_calc_hash(1, macini->cri_key, (*ocd)->octo_hminner,
					(*ocd)->octo_hmouter);
			break;
		case -1:
			(*ocd)->octo_encrypt = octo_des_cbc_encrypt;
			(*ocd)->octo_decrypt = octo_des_cbc_decrypt;
			break;
		default:
			octo_freesession(NULL, i);
			dprintk("%s,%d: EINVALn", __FILE__, __LINE__);
			return EINVAL;
		}
		break;
	case CRYPTO_AES_CBC:
		(*ocd)->octo_ivsize  = 16;
		switch (macini ? macini->cri_alg : -1) {
		case CRYPTO_MD5_HMAC:
			(*ocd)->octo_encrypt = octo_aes_cbc_md5_encrypt;
			(*ocd)->octo_decrypt = octo_aes_cbc_md5_decrypt;
			octo_calc_hash(0, macini->cri_key, (*ocd)->octo_hminner,
					(*ocd)->octo_hmouter);
			break;
		case CRYPTO_SHA1_HMAC:
			(*ocd)->octo_encrypt = octo_aes_cbc_sha1_encrypt;
			(*ocd)->octo_decrypt = octo_aes_cbc_sha1_decrypt;
			octo_calc_hash(1, macini->cri_key, (*ocd)->octo_hminner,
					(*ocd)->octo_hmouter);
			break;
		case -1:
			(*ocd)->octo_encrypt = octo_aes_cbc_encrypt;
			(*ocd)->octo_decrypt = octo_aes_cbc_decrypt;
			break;
		default:
			octo_freesession(NULL, i);
			dprintk("%s,%d: EINVALn", __FILE__, __LINE__);
			return EINVAL;
		}
		break;
	case CRYPTO_MD5_HMAC:
		(*ocd)->octo_encrypt = octo_null_md5_encrypt;
		(*ocd)->octo_decrypt = octo_null_md5_encrypt; /* encrypt == decrypt */
		octo_calc_hash(0, macini->cri_key, (*ocd)->octo_hminner,
				(*ocd)->octo_hmouter);
		break;
	case CRYPTO_SHA1_HMAC:
		(*ocd)->octo_encrypt = octo_null_sha1_encrypt;
		(*ocd)->octo_decrypt = octo_null_sha1_encrypt; /* encrypt == decrypt */
		octo_calc_hash(1, macini->cri_key, (*ocd)->octo_hminner,
				(*ocd)->octo_hmouter);
		break;
	default:
		octo_freesession(NULL, i);
		dprintk("%s,%d: EINVALn", __FILE__, __LINE__);
		return EINVAL;
	}

	(*ocd)->octo_encalg = encini ? encini->cri_alg : -1;
	(*ocd)->octo_macalg = macini ? macini->cri_alg : -1;

	return 0;
}

/*
 * Free a session.
 */
static int
octo_freesession(device_t dev, u_int64_t tid)
{
	u_int32_t sid = CRYPTO_SESID2LID(tid);

	dprintk("%s()\n", __FUNCTION__);
	if (sid > octo_sesnum || octo_sessions == NULL ||
			octo_sessions[sid] == NULL) {
		dprintk("%s,%d: EINVAL\n", __FILE__, __LINE__);
		return(EINVAL);
	}

	/* Silently accept and return */
	if (sid == 0)
		return(0);

	if (octo_sessions[sid])
		kfree(octo_sessions[sid]);
	octo_sessions[sid] = NULL;
	return 0;
}

/*
 * Process a request.
 */
static int
octo_process(device_t dev, struct cryptop *crp, int hint)
{
	struct cryptodesc *crd;
	struct octo_sess *od;
	u_int32_t lid;
#define SCATTERLIST_MAX 16
	struct scatterlist sg[SCATTERLIST_MAX];
	int sg_num, sg_len;
	struct sk_buff *skb = NULL;
	struct uio *uiop = NULL;
	struct cryptodesc *enccrd = NULL, *maccrd = NULL;
	unsigned char *ivp = NULL;
	unsigned char iv_data[HASH_MAX_LEN];
	int auth_off = 0, auth_len = 0, crypt_off = 0, crypt_len = 0, icv_off = 0;

	dprintk("%s()\n", __FUNCTION__);
	/* Sanity check */
	if (crp == NULL) {
		dprintk("%s,%d: EINVAL\n", __FILE__, __LINE__);
		return EINVAL;
	}

	crp->crp_etype = 0;

	if (crp->crp_desc == NULL || crp->crp_buf == NULL) {
		dprintk("%s,%d: EINVAL\n", __FILE__, __LINE__);
		crp->crp_etype = EINVAL;
		goto done;
	}

	lid = crp->crp_sid & 0xffffffff;
	if (lid >= octo_sesnum || lid == 0 || octo_sessions == NULL ||
			octo_sessions[lid] == NULL) {
		crp->crp_etype = ENOENT;
		dprintk("%s,%d: ENOENT\n", __FILE__, __LINE__);
		goto done;
	}
	od = octo_sessions[lid];

	/*
	 * do some error checking outside of the loop for SKB and IOV processing
	 * this leaves us with valid skb or uiop pointers for later
	 */
	if (crp->crp_flags & CRYPTO_F_SKBUF) {
		skb = (struct sk_buff *) crp->crp_buf;
		if (skb_shinfo(skb)->nr_frags >= SCATTERLIST_MAX) {
			printk("%s,%d: %d nr_frags > SCATTERLIST_MAX", __FILE__, __LINE__,
					skb_shinfo(skb)->nr_frags);
			goto done;
		}
	} else if (crp->crp_flags & CRYPTO_F_IOV) {
		uiop = (struct uio *) crp->crp_buf;
		if (uiop->uio_iovcnt > SCATTERLIST_MAX) {
			printk("%s,%d: %d uio_iovcnt > SCATTERLIST_MAX", __FILE__, __LINE__,
					uiop->uio_iovcnt);
			goto done;
		}
	}

	/* point our enccrd and maccrd appropriately */
	crd = crp->crp_desc;
	if (crd->crd_alg == od->octo_encalg) enccrd = crd;
	if (crd->crd_alg == od->octo_macalg) maccrd = crd;
	crd = crd->crd_next;
	if (crd) {
		if (crd->crd_alg == od->octo_encalg) enccrd = crd;
		if (crd->crd_alg == od->octo_macalg) maccrd = crd;
		crd = crd->crd_next;
	}
	if (crd) {
		crp->crp_etype = EINVAL;
		dprintk("%s,%d: ENOENT - descriptors do not match session\n",
				__FILE__, __LINE__);
		goto done;
	}

	if (enccrd) {
		if (enccrd->crd_flags & CRD_F_ENCRYPT) {
			if (enccrd->crd_flags & CRD_F_IV_EXPLICIT)
				ivp = enccrd->crd_iv;
			else
				read_random((ivp = iv_data), od->octo_ivsize);
			if ((enccrd->crd_flags & CRD_F_IV_PRESENT) == 0)
				crypto_copyback(crp->crp_flags, crp->crp_buf,
						enccrd->crd_inject, od->octo_ivsize, ivp);
		} else {
			if (enccrd->crd_flags & CRD_F_IV_EXPLICIT) {
				ivp = enccrd->crd_iv;
			} else {
				ivp = iv_data;
				crypto_copydata(crp->crp_flags, crp->crp_buf,
						enccrd->crd_inject, od->octo_ivsize, (caddr_t) ivp);
			}
		}

		if (maccrd) {
			auth_off = maccrd->crd_skip;
			auth_len = maccrd->crd_len;
			icv_off  = maccrd->crd_inject;
		}

		crypt_off = enccrd->crd_skip;
		crypt_len = enccrd->crd_len;
	} else { /* if (maccrd) */
		auth_off = maccrd->crd_skip;
		auth_len = maccrd->crd_len;
		icv_off  = maccrd->crd_inject;
	}


	/*
	 * setup the SG list to cover the buffer
	 */
	memset(sg, 0, sizeof(sg));
	if (crp->crp_flags & CRYPTO_F_SKBUF) {
		int i, len;

		sg_num = 0;
		sg_len = 0;

		len = skb_headlen(skb);
		sg_set_page(&sg[sg_num], virt_to_page(skb->data), len,
				offset_in_page(skb->data));
		sg_len += len;
		sg_num++;

		for (i = 0; i < skb_shinfo(skb)->nr_frags && sg_num < SCATTERLIST_MAX;
				i++) {
			len = skb_shinfo(skb)->frags[i].size;
			sg_set_page(&sg[sg_num], skb_frag_page(&skb_shinfo(skb)->frags[i]),
					len, skb_shinfo(skb)->frags[i].page_offset);
			sg_len += len;
			sg_num++;
		}
	} else if (crp->crp_flags & CRYPTO_F_IOV) {
		int len;

		sg_len = 0;
		for (sg_num = 0; sg_len < crp->crp_ilen &&
				sg_num < uiop->uio_iovcnt &&
				sg_num < SCATTERLIST_MAX; sg_num++) {
			len = uiop->uio_iov[sg_num].iov_len;
			sg_set_page(&sg[sg_num],
					virt_to_page(uiop->uio_iov[sg_num].iov_base), len,
					offset_in_page(uiop->uio_iov[sg_num].iov_base));
			sg_len += len;
		}
	} else {
		sg_len = crp->crp_ilen;
		sg_set_page(&sg[0], virt_to_page(crp->crp_buf), sg_len,
				offset_in_page(crp->crp_buf));
		sg_num = 1;
	}
	if (sg_num > 0)
		sg_mark_end(&sg[sg_num-1]);

	/*
	 * setup a new explicit key
	 */
	if (enccrd) {
		if (enccrd->crd_flags & CRD_F_KEY_EXPLICIT) {
			od->octo_encklen = (enccrd->crd_klen + 7) / 8;
			memcpy(od->octo_enckey, enccrd->crd_key, od->octo_encklen);
		}
	}
	if (maccrd) {
		if (maccrd->crd_flags & CRD_F_KEY_EXPLICIT) {
			od->octo_macklen = (maccrd->crd_klen + 7) / 8;
			memcpy(od->octo_mackey, maccrd->crd_key, od->octo_macklen);
			od->octo_mackey_set = 0;
		}
		if (!od->octo_mackey_set) {
			octo_calc_hash(maccrd->crd_alg == CRYPTO_MD5_HMAC ? 0 : 1,
				maccrd->crd_key, od->octo_hminner, od->octo_hmouter);
			od->octo_mackey_set = 1;
		}
	}


	if (!enccrd || (enccrd->crd_flags & CRD_F_ENCRYPT))
		(*od->octo_encrypt)(od, sg, sg_len,
				auth_off, auth_len, crypt_off, crypt_len, icv_off, ivp);
	else
		(*od->octo_decrypt)(od, sg, sg_len,
				auth_off, auth_len, crypt_off, crypt_len, icv_off, ivp);

done:
	crypto_done(crp);
	return 0;
}

static int
cryptocteon_init(void)
{
	dprintk("%s(%p)\n", __FUNCTION__, cryptocteon_init);

	softc_device_init(&octo_softc, "cryptocteon", 0, octo_methods);

	octo_id = crypto_get_driverid(softc_get_device(&octo_softc),
			CRYPTOCAP_F_HARDWARE | CRYPTOCAP_F_SYNC);
	if (octo_id < 0) {
		printk("Cryptocteon device cannot initialize!");
		return -ENODEV;
	}

	crypto_register(octo_id, CRYPTO_MD5_HMAC, 0,0);
	crypto_register(octo_id, CRYPTO_SHA1_HMAC, 0,0);
	//crypto_register(octo_id, CRYPTO_MD5, 0,0);
	//crypto_register(octo_id, CRYPTO_SHA1, 0,0);
	crypto_register(octo_id, CRYPTO_DES_CBC, 0,0);
	crypto_register(octo_id, CRYPTO_3DES_CBC, 0,0);
	crypto_register(octo_id, CRYPTO_AES_CBC, 0,0);

	return(0);
}

static void
cryptocteon_exit(void)
{
	dprintk("%s()\n", __FUNCTION__);
	crypto_unregister_all(octo_id);
	octo_id = -1;
}

module_init(cryptocteon_init);
module_exit(cryptocteon_exit);

MODULE_LICENSE("Dual BSD/GPL");
MODULE_AUTHOR("David McCullough <david_mccullough@mcafee.com>");
MODULE_DESCRIPTION("Cryptocteon (OCF module for Cavium OCTEON crypto)");