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87a4c379d42208730dcaa1634edcb9e7110124d0
[openwrt/openwrt.git] / target / linux / generic / files / crypto / ocf / cryptodev.c
1 /* $OpenBSD: cryptodev.c,v 1.52 2002/06/19 07:22:46 deraadt Exp $ */
2
3 /*-
4 * Linux port done by David McCullough <david_mccullough@mcafee.com>
5 * Copyright (C) 2006-2010 David McCullough
6 * Copyright (C) 2004-2005 Intel Corporation.
7 * The license and original author are listed below.
8 *
9 * Copyright (c) 2001 Theo de Raadt
10 * Copyright (c) 2002-2006 Sam Leffler, Errno Consulting
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 *
16 * 1. Redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution.
21 * 3. The name of the author may not be used to endorse or promote products
22 * derived from this software without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
25 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
26 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
27 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
28 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
29 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
30 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
31 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
32 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
33 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34 *
35 * Effort sponsored in part by the Defense Advanced Research Projects
36 * Agency (DARPA) and Air Force Research Laboratory, Air Force
37 * Materiel Command, USAF, under agreement number F30602-01-2-0537.
38 *
39 __FBSDID("$FreeBSD: src/sys/opencrypto/cryptodev.c,v 1.34 2007/05/09 19:37:02 gnn Exp $");
40 */
41
42 #ifndef AUTOCONF_INCLUDED
43 #include <linux/config.h>
44 #endif
45 #include <linux/types.h>
46 #include <linux/time.h>
47 #include <linux/delay.h>
48 #include <linux/list.h>
49 #include <linux/init.h>
50 #include <linux/sched.h>
51 #include <linux/unistd.h>
52 #include <linux/module.h>
53 #include <linux/wait.h>
54 #include <linux/slab.h>
55 #include <linux/fs.h>
56 #include <linux/dcache.h>
57 #include <linux/file.h>
58 #include <linux/mount.h>
59 #include <linux/miscdevice.h>
60 #include <linux/version.h>
61 #include <asm/uaccess.h>
62
63 #include <cryptodev.h>
64 #include <uio.h>
65
66 extern asmlinkage long sys_dup(unsigned int fildes);
67
68 #define debug cryptodev_debug
69 int cryptodev_debug = 0;
70 module_param(cryptodev_debug, int, 0644);
71 MODULE_PARM_DESC(cryptodev_debug, "Enable cryptodev debug");
72
73 struct csession_info {
74 u_int16_t blocksize;
75 u_int16_t minkey, maxkey;
76
77 u_int16_t keysize;
78 /* u_int16_t hashsize; */
79 u_int16_t authsize;
80 u_int16_t authkey;
81 /* u_int16_t ctxsize; */
82 };
83
84 struct csession {
85 struct list_head list;
86 u_int64_t sid;
87 u_int32_t ses;
88
89 wait_queue_head_t waitq;
90
91 u_int32_t cipher;
92
93 u_int32_t mac;
94
95 caddr_t key;
96 int keylen;
97 u_char tmp_iv[EALG_MAX_BLOCK_LEN];
98
99 caddr_t mackey;
100 int mackeylen;
101
102 struct csession_info info;
103
104 struct iovec iovec;
105 struct uio uio;
106 int error;
107 };
108
109 struct fcrypt {
110 struct list_head csessions;
111 int sesn;
112 };
113
114 static struct csession *csefind(struct fcrypt *, u_int);
115 static int csedelete(struct fcrypt *, struct csession *);
116 static struct csession *cseadd(struct fcrypt *, struct csession *);
117 static struct csession *csecreate(struct fcrypt *, u_int64_t,
118 struct cryptoini *crie, struct cryptoini *cria, struct csession_info *);
119 static int csefree(struct csession *);
120
121 static int cryptodev_op(struct csession *, struct crypt_op *);
122 static int cryptodev_key(struct crypt_kop *);
123 static int cryptodev_find(struct crypt_find_op *);
124
125 static int cryptodev_cb(void *);
126 static int cryptodev_open(struct inode *inode, struct file *filp);
127
128 /*
129 * Check a crypto identifier to see if it requested
130 * a valid crid and it's capabilities match.
131 */
132 static int
133 checkcrid(int crid)
134 {
135 int hid = crid & ~(CRYPTOCAP_F_SOFTWARE | CRYPTOCAP_F_HARDWARE);
136 int typ = crid & (CRYPTOCAP_F_SOFTWARE | CRYPTOCAP_F_HARDWARE);
137 int caps = 0;
138
139 /* if the user hasn't selected a driver, then just call newsession */
140 if (hid == 0 && typ != 0)
141 return 0;
142
143 caps = crypto_getcaps(hid);
144
145 /* didn't find anything with capabilities */
146 if (caps == 0) {
147 dprintk("%s: hid=%x typ=%x not matched\n", __FUNCTION__, hid, typ);
148 return EINVAL;
149 }
150
151 /* the user didn't specify SW or HW, so the driver is ok */
152 if (typ == 0)
153 return 0;
154
155 /* if the type specified didn't match */
156 if (typ != (caps & (CRYPTOCAP_F_SOFTWARE | CRYPTOCAP_F_HARDWARE))) {
157 dprintk("%s: hid=%x typ=%x caps=%x not matched\n", __FUNCTION__,
158 hid, typ, caps);
159 return EINVAL;
160 }
161
162 return 0;
163 }
164
165 static int
166 cryptodev_op(struct csession *cse, struct crypt_op *cop)
167 {
168 struct cryptop *crp = NULL;
169 struct cryptodesc *crde = NULL, *crda = NULL;
170 int error = 0;
171
172 dprintk("%s()\n", __FUNCTION__);
173 if (cop->len > CRYPTO_MAX_DATA_LEN) {
174 dprintk("%s: %d > %d\n", __FUNCTION__, cop->len, CRYPTO_MAX_DATA_LEN);
175 return (E2BIG);
176 }
177
178 if (cse->info.blocksize && (cop->len % cse->info.blocksize) != 0) {
179 dprintk("%s: blocksize=%d len=%d\n", __FUNCTION__, cse->info.blocksize,
180 cop->len);
181 return (EINVAL);
182 }
183
184 cse->uio.uio_iov = &cse->iovec;
185 cse->uio.uio_iovcnt = 1;
186 cse->uio.uio_offset = 0;
187 #if 0
188 cse->uio.uio_resid = cop->len;
189 cse->uio.uio_segflg = UIO_SYSSPACE;
190 cse->uio.uio_rw = UIO_WRITE;
191 cse->uio.uio_td = td;
192 #endif
193 cse->uio.uio_iov[0].iov_len = cop->len;
194 if (cse->info.authsize)
195 cse->uio.uio_iov[0].iov_len += cse->info.authsize;
196 cse->uio.uio_iov[0].iov_base = kmalloc(cse->uio.uio_iov[0].iov_len,
197 GFP_KERNEL);
198
199 if (cse->uio.uio_iov[0].iov_base == NULL) {
200 dprintk("%s: iov_base kmalloc(%d) failed\n", __FUNCTION__,
201 (int)cse->uio.uio_iov[0].iov_len);
202 return (ENOMEM);
203 }
204
205 crp = crypto_getreq((cse->info.blocksize != 0) + (cse->info.authsize != 0));
206 if (crp == NULL) {
207 dprintk("%s: ENOMEM\n", __FUNCTION__);
208 error = ENOMEM;
209 goto bail;
210 }
211
212 if (cse->info.authsize && cse->info.blocksize) {
213 if (cop->op == COP_ENCRYPT) {
214 crde = crp->crp_desc;
215 crda = crde->crd_next;
216 } else {
217 crda = crp->crp_desc;
218 crde = crda->crd_next;
219 }
220 } else if (cse->info.authsize) {
221 crda = crp->crp_desc;
222 } else if (cse->info.blocksize) {
223 crde = crp->crp_desc;
224 } else {
225 dprintk("%s: bad request\n", __FUNCTION__);
226 error = EINVAL;
227 goto bail;
228 }
229
230 if ((error = copy_from_user(cse->uio.uio_iov[0].iov_base, cop->src,
231 cop->len))) {
232 dprintk("%s: bad copy\n", __FUNCTION__);
233 goto bail;
234 }
235
236 if (crda) {
237 crda->crd_skip = 0;
238 crda->crd_len = cop->len;
239 crda->crd_inject = cop->len;
240
241 crda->crd_alg = cse->mac;
242 crda->crd_key = cse->mackey;
243 crda->crd_klen = cse->mackeylen * 8;
244 }
245
246 if (crde) {
247 if (cop->op == COP_ENCRYPT)
248 crde->crd_flags |= CRD_F_ENCRYPT;
249 else
250 crde->crd_flags &= ~CRD_F_ENCRYPT;
251 crde->crd_len = cop->len;
252 crde->crd_inject = 0;
253
254 crde->crd_alg = cse->cipher;
255 crde->crd_key = cse->key;
256 crde->crd_klen = cse->keylen * 8;
257 }
258
259 crp->crp_ilen = cse->uio.uio_iov[0].iov_len;
260 crp->crp_flags = CRYPTO_F_IOV | CRYPTO_F_CBIMM
261 | (cop->flags & COP_F_BATCH);
262 crp->crp_buf = (caddr_t)&cse->uio;
263 crp->crp_callback = (int (*) (struct cryptop *)) cryptodev_cb;
264 crp->crp_sid = cse->sid;
265 crp->crp_opaque = (void *)cse;
266
267 if (cop->iv) {
268 if (crde == NULL) {
269 error = EINVAL;
270 dprintk("%s no crde\n", __FUNCTION__);
271 goto bail;
272 }
273 if (cse->cipher == CRYPTO_ARC4) { /* XXX use flag? */
274 error = EINVAL;
275 dprintk("%s arc4 with IV\n", __FUNCTION__);
276 goto bail;
277 }
278 if ((error = copy_from_user(cse->tmp_iv, cop->iv,
279 cse->info.blocksize))) {
280 dprintk("%s bad iv copy\n", __FUNCTION__);
281 goto bail;
282 }
283 memcpy(crde->crd_iv, cse->tmp_iv, cse->info.blocksize);
284 crde->crd_flags |= CRD_F_IV_EXPLICIT | CRD_F_IV_PRESENT;
285 crde->crd_skip = 0;
286 } else if (cse->cipher == CRYPTO_ARC4) { /* XXX use flag? */
287 crde->crd_skip = 0;
288 } else if (crde) {
289 crde->crd_flags |= CRD_F_IV_PRESENT;
290 crde->crd_skip = cse->info.blocksize;
291 crde->crd_len -= cse->info.blocksize;
292 }
293
294 if (cop->mac && crda == NULL) {
295 error = EINVAL;
296 dprintk("%s no crda\n", __FUNCTION__);
297 goto bail;
298 }
299
300 /*
301 * Let the dispatch run unlocked, then, interlock against the
302 * callback before checking if the operation completed and going
303 * to sleep. This insures drivers don't inherit our lock which
304 * results in a lock order reversal between crypto_dispatch forced
305 * entry and the crypto_done callback into us.
306 */
307 error = crypto_dispatch(crp);
308 if (error) {
309 dprintk("%s error in crypto_dispatch\n", __FUNCTION__);
310 goto bail;
311 }
312
313 dprintk("%s about to WAIT\n", __FUNCTION__);
314 /*
315 * we really need to wait for driver to complete to maintain
316 * state, luckily interrupts will be remembered
317 */
318 do {
319 error = wait_event_interruptible(crp->crp_waitq,
320 ((crp->crp_flags & CRYPTO_F_DONE) != 0));
321 /*
322 * we can't break out of this loop or we will leave behind
323 * a huge mess, however, staying here means if your driver
324 * is broken user applications can hang and not be killed.
325 * The solution, fix your driver :-)
326 */
327 if (error) {
328 schedule();
329 error = 0;
330 }
331 } while ((crp->crp_flags & CRYPTO_F_DONE) == 0);
332 dprintk("%s finished WAITING error=%d\n", __FUNCTION__, error);
333
334 if (crp->crp_etype != 0) {
335 error = crp->crp_etype;
336 dprintk("%s error in crp processing\n", __FUNCTION__);
337 goto bail;
338 }
339
340 if (cse->error) {
341 error = cse->error;
342 dprintk("%s error in cse processing\n", __FUNCTION__);
343 goto bail;
344 }
345
346 if (cop->dst && (error = copy_to_user(cop->dst,
347 cse->uio.uio_iov[0].iov_base, cop->len))) {
348 dprintk("%s bad dst copy\n", __FUNCTION__);
349 goto bail;
350 }
351
352 if (cop->mac &&
353 (error=copy_to_user(cop->mac,
354 (caddr_t)cse->uio.uio_iov[0].iov_base + cop->len,
355 cse->info.authsize))) {
356 dprintk("%s bad mac copy\n", __FUNCTION__);
357 goto bail;
358 }
359
360 bail:
361 if (crp)
362 crypto_freereq(crp);
363 if (cse->uio.uio_iov[0].iov_base)
364 kfree(cse->uio.uio_iov[0].iov_base);
365
366 return (error);
367 }
368
369 static int
370 cryptodev_cb(void *op)
371 {
372 struct cryptop *crp = (struct cryptop *) op;
373 struct csession *cse = (struct csession *)crp->crp_opaque;
374 int error;
375
376 dprintk("%s()\n", __FUNCTION__);
377 error = crp->crp_etype;
378 if (error == EAGAIN) {
379 crp->crp_flags &= ~CRYPTO_F_DONE;
380 #ifdef NOTYET
381 /*
382 * DAVIDM I am fairly sure that we should turn this into a batch
383 * request to stop bad karma/lockup, revisit
384 */
385 crp->crp_flags |= CRYPTO_F_BATCH;
386 #endif
387 return crypto_dispatch(crp);
388 }
389 if (error != 0 || (crp->crp_flags & CRYPTO_F_DONE)) {
390 cse->error = error;
391 wake_up_interruptible(&crp->crp_waitq);
392 }
393 return (0);
394 }
395
396 static int
397 cryptodevkey_cb(void *op)
398 {
399 struct cryptkop *krp = (struct cryptkop *) op;
400 dprintk("%s()\n", __FUNCTION__);
401 wake_up_interruptible(&krp->krp_waitq);
402 return (0);
403 }
404
405 static int
406 cryptodev_key(struct crypt_kop *kop)
407 {
408 struct cryptkop *krp = NULL;
409 int error = EINVAL;
410 int in, out, size, i;
411
412 dprintk("%s()\n", __FUNCTION__);
413 if (kop->crk_iparams + kop->crk_oparams > CRK_MAXPARAM) {
414 dprintk("%s params too big\n", __FUNCTION__);
415 return (EFBIG);
416 }
417
418 in = kop->crk_iparams;
419 out = kop->crk_oparams;
420 switch (kop->crk_op) {
421 case CRK_MOD_EXP:
422 if (in == 3 && out == 1)
423 break;
424 return (EINVAL);
425 case CRK_MOD_EXP_CRT:
426 if (in == 6 && out == 1)
427 break;
428 return (EINVAL);
429 case CRK_DSA_SIGN:
430 if (in == 5 && out == 2)
431 break;
432 return (EINVAL);
433 case CRK_DSA_VERIFY:
434 if (in == 7 && out == 0)
435 break;
436 return (EINVAL);
437 case CRK_DH_COMPUTE_KEY:
438 if (in == 3 && out == 1)
439 break;
440 return (EINVAL);
441 default:
442 return (EINVAL);
443 }
444
445 krp = (struct cryptkop *)kmalloc(sizeof *krp, GFP_KERNEL);
446 if (!krp)
447 return (ENOMEM);
448 bzero(krp, sizeof *krp);
449 krp->krp_op = kop->crk_op;
450 krp->krp_status = kop->crk_status;
451 krp->krp_iparams = kop->crk_iparams;
452 krp->krp_oparams = kop->crk_oparams;
453 krp->krp_crid = kop->crk_crid;
454 krp->krp_status = 0;
455 krp->krp_flags = CRYPTO_KF_CBIMM;
456 krp->krp_callback = (int (*) (struct cryptkop *)) cryptodevkey_cb;
457 init_waitqueue_head(&krp->krp_waitq);
458
459 for (i = 0; i < CRK_MAXPARAM; i++)
460 krp->krp_param[i].crp_nbits = kop->crk_param[i].crp_nbits;
461 for (i = 0; i < krp->krp_iparams + krp->krp_oparams; i++) {
462 size = (krp->krp_param[i].crp_nbits + 7) / 8;
463 if (size == 0)
464 continue;
465 krp->krp_param[i].crp_p = (caddr_t) kmalloc(size, GFP_KERNEL);
466 if (i >= krp->krp_iparams)
467 continue;
468 error = copy_from_user(krp->krp_param[i].crp_p,
469 kop->crk_param[i].crp_p, size);
470 if (error)
471 goto fail;
472 }
473
474 error = crypto_kdispatch(krp);
475 if (error)
476 goto fail;
477
478 do {
479 error = wait_event_interruptible(krp->krp_waitq,
480 ((krp->krp_flags & CRYPTO_KF_DONE) != 0));
481 /*
482 * we can't break out of this loop or we will leave behind
483 * a huge mess, however, staying here means if your driver
484 * is broken user applications can hang and not be killed.
485 * The solution, fix your driver :-)
486 */
487 if (error) {
488 schedule();
489 error = 0;
490 }
491 } while ((krp->krp_flags & CRYPTO_KF_DONE) == 0);
492
493 dprintk("%s finished WAITING error=%d\n", __FUNCTION__, error);
494
495 kop->crk_crid = krp->krp_crid; /* device that did the work */
496 if (krp->krp_status != 0) {
497 error = krp->krp_status;
498 goto fail;
499 }
500
501 for (i = krp->krp_iparams; i < krp->krp_iparams + krp->krp_oparams; i++) {
502 size = (krp->krp_param[i].crp_nbits + 7) / 8;
503 if (size == 0)
504 continue;
505 error = copy_to_user(kop->crk_param[i].crp_p, krp->krp_param[i].crp_p,
506 size);
507 if (error)
508 goto fail;
509 }
510
511 fail:
512 if (krp) {
513 kop->crk_status = krp->krp_status;
514 for (i = 0; i < CRK_MAXPARAM; i++) {
515 if (krp->krp_param[i].crp_p)
516 kfree(krp->krp_param[i].crp_p);
517 }
518 kfree(krp);
519 }
520 return (error);
521 }
522
523 static int
524 cryptodev_find(struct crypt_find_op *find)
525 {
526 device_t dev;
527
528 if (find->crid != -1) {
529 dev = crypto_find_device_byhid(find->crid);
530 if (dev == NULL)
531 return (ENOENT);
532 strlcpy(find->name, device_get_nameunit(dev),
533 sizeof(find->name));
534 } else {
535 find->crid = crypto_find_driver(find->name);
536 if (find->crid == -1)
537 return (ENOENT);
538 }
539 return (0);
540 }
541
542 static struct csession *
543 csefind(struct fcrypt *fcr, u_int ses)
544 {
545 struct csession *cse;
546
547 dprintk("%s()\n", __FUNCTION__);
548 list_for_each_entry(cse, &fcr->csessions, list)
549 if (cse->ses == ses)
550 return (cse);
551 return (NULL);
552 }
553
554 static int
555 csedelete(struct fcrypt *fcr, struct csession *cse_del)
556 {
557 struct csession *cse;
558
559 dprintk("%s()\n", __FUNCTION__);
560 list_for_each_entry(cse, &fcr->csessions, list) {
561 if (cse == cse_del) {
562 list_del(&cse->list);
563 return (1);
564 }
565 }
566 return (0);
567 }
568
569 static struct csession *
570 cseadd(struct fcrypt *fcr, struct csession *cse)
571 {
572 dprintk("%s()\n", __FUNCTION__);
573 list_add_tail(&cse->list, &fcr->csessions);
574 cse->ses = fcr->sesn++;
575 return (cse);
576 }
577
578 static struct csession *
579 csecreate(struct fcrypt *fcr, u_int64_t sid, struct cryptoini *crie,
580 struct cryptoini *cria, struct csession_info *info)
581 {
582 struct csession *cse;
583
584 dprintk("%s()\n", __FUNCTION__);
585 cse = (struct csession *) kmalloc(sizeof(struct csession), GFP_KERNEL);
586 if (cse == NULL)
587 return NULL;
588 memset(cse, 0, sizeof(struct csession));
589
590 INIT_LIST_HEAD(&cse->list);
591 init_waitqueue_head(&cse->waitq);
592
593 cse->key = crie->cri_key;
594 cse->keylen = crie->cri_klen/8;
595 cse->mackey = cria->cri_key;
596 cse->mackeylen = cria->cri_klen/8;
597 cse->sid = sid;
598 cse->cipher = crie->cri_alg;
599 cse->mac = cria->cri_alg;
600 cse->info = *info;
601 cseadd(fcr, cse);
602 return (cse);
603 }
604
605 static int
606 csefree(struct csession *cse)
607 {
608 int error;
609
610 dprintk("%s()\n", __FUNCTION__);
611 error = crypto_freesession(cse->sid);
612 if (cse->key)
613 kfree(cse->key);
614 if (cse->mackey)
615 kfree(cse->mackey);
616 kfree(cse);
617 return(error);
618 }
619
620 static int
621 cryptodev_ioctl(
622 struct inode *inode,
623 struct file *filp,
624 unsigned int cmd,
625 unsigned long arg)
626 {
627 struct cryptoini cria, crie;
628 struct fcrypt *fcr = filp->private_data;
629 struct csession *cse;
630 struct csession_info info;
631 struct session2_op sop;
632 struct crypt_op cop;
633 struct crypt_kop kop;
634 struct crypt_find_op fop;
635 u_int64_t sid;
636 u_int32_t ses = 0;
637 int feat, fd, error = 0, crid;
638 mm_segment_t fs;
639
640 dprintk("%s(cmd=%x arg=%lx)\n", __FUNCTION__, cmd, arg);
641
642 switch (cmd) {
643
644 case CRIOGET: {
645 dprintk("%s(CRIOGET)\n", __FUNCTION__);
646 fs = get_fs();
647 set_fs(get_ds());
648 for (fd = 0; fd < files_fdtable(current->files)->max_fds; fd++)
649 if (files_fdtable(current->files)->fd[fd] == filp)
650 break;
651 fd = sys_dup(fd);
652 set_fs(fs);
653 put_user(fd, (int *) arg);
654 return IS_ERR_VALUE(fd) ? fd : 0;
655 }
656
657 #define CIOCGSESSSTR (cmd == CIOCGSESSION ? "CIOCGSESSION" : "CIOCGSESSION2")
658 case CIOCGSESSION:
659 case CIOCGSESSION2:
660 dprintk("%s(%s)\n", __FUNCTION__, CIOCGSESSSTR);
661 memset(&crie, 0, sizeof(crie));
662 memset(&cria, 0, sizeof(cria));
663 memset(&info, 0, sizeof(info));
664 memset(&sop, 0, sizeof(sop));
665
666 if (copy_from_user(&sop, (void*)arg, (cmd == CIOCGSESSION) ?
667 sizeof(struct session_op) : sizeof(sop))) {
668 dprintk("%s(%s) - bad copy\n", __FUNCTION__, CIOCGSESSSTR);
669 error = EFAULT;
670 goto bail;
671 }
672
673 switch (sop.cipher) {
674 case 0:
675 dprintk("%s(%s) - no cipher\n", __FUNCTION__, CIOCGSESSSTR);
676 break;
677 case CRYPTO_NULL_CBC:
678 info.blocksize = NULL_BLOCK_LEN;
679 info.minkey = NULL_MIN_KEY_LEN;
680 info.maxkey = NULL_MAX_KEY_LEN;
681 break;
682 case CRYPTO_DES_CBC:
683 info.blocksize = DES_BLOCK_LEN;
684 info.minkey = DES_MIN_KEY_LEN;
685 info.maxkey = DES_MAX_KEY_LEN;
686 break;
687 case CRYPTO_3DES_CBC:
688 info.blocksize = DES3_BLOCK_LEN;
689 info.minkey = DES3_MIN_KEY_LEN;
690 info.maxkey = DES3_MAX_KEY_LEN;
691 break;
692 case CRYPTO_BLF_CBC:
693 info.blocksize = BLOWFISH_BLOCK_LEN;
694 info.minkey = BLOWFISH_MIN_KEY_LEN;
695 info.maxkey = BLOWFISH_MAX_KEY_LEN;
696 break;
697 case CRYPTO_CAST_CBC:
698 info.blocksize = CAST128_BLOCK_LEN;
699 info.minkey = CAST128_MIN_KEY_LEN;
700 info.maxkey = CAST128_MAX_KEY_LEN;
701 break;
702 case CRYPTO_SKIPJACK_CBC:
703 info.blocksize = SKIPJACK_BLOCK_LEN;
704 info.minkey = SKIPJACK_MIN_KEY_LEN;
705 info.maxkey = SKIPJACK_MAX_KEY_LEN;
706 break;
707 case CRYPTO_AES_CBC:
708 info.blocksize = AES_BLOCK_LEN;
709 info.minkey = AES_MIN_KEY_LEN;
710 info.maxkey = AES_MAX_KEY_LEN;
711 break;
712 case CRYPTO_ARC4:
713 info.blocksize = ARC4_BLOCK_LEN;
714 info.minkey = ARC4_MIN_KEY_LEN;
715 info.maxkey = ARC4_MAX_KEY_LEN;
716 break;
717 case CRYPTO_CAMELLIA_CBC:
718 info.blocksize = CAMELLIA_BLOCK_LEN;
719 info.minkey = CAMELLIA_MIN_KEY_LEN;
720 info.maxkey = CAMELLIA_MAX_KEY_LEN;
721 break;
722 default:
723 dprintk("%s(%s) - bad cipher\n", __FUNCTION__, CIOCGSESSSTR);
724 error = EINVAL;
725 goto bail;
726 }
727
728 switch (sop.mac) {
729 case 0:
730 dprintk("%s(%s) - no mac\n", __FUNCTION__, CIOCGSESSSTR);
731 break;
732 case CRYPTO_NULL_HMAC:
733 info.authsize = NULL_HASH_LEN;
734 break;
735 case CRYPTO_MD5:
736 info.authsize = MD5_HASH_LEN;
737 break;
738 case CRYPTO_SHA1:
739 info.authsize = SHA1_HASH_LEN;
740 break;
741 case CRYPTO_SHA2_256:
742 info.authsize = SHA2_256_HASH_LEN;
743 break;
744 case CRYPTO_SHA2_384:
745 info.authsize = SHA2_384_HASH_LEN;
746 break;
747 case CRYPTO_SHA2_512:
748 info.authsize = SHA2_512_HASH_LEN;
749 break;
750 case CRYPTO_RIPEMD160:
751 info.authsize = RIPEMD160_HASH_LEN;
752 break;
753 case CRYPTO_MD5_HMAC:
754 info.authsize = MD5_HASH_LEN;
755 info.authkey = 16;
756 break;
757 case CRYPTO_SHA1_HMAC:
758 info.authsize = SHA1_HASH_LEN;
759 info.authkey = 20;
760 break;
761 case CRYPTO_SHA2_256_HMAC:
762 info.authsize = SHA2_256_HASH_LEN;
763 info.authkey = 32;
764 break;
765 case CRYPTO_SHA2_384_HMAC:
766 info.authsize = SHA2_384_HASH_LEN;
767 info.authkey = 48;
768 break;
769 case CRYPTO_SHA2_512_HMAC:
770 info.authsize = SHA2_512_HASH_LEN;
771 info.authkey = 64;
772 break;
773 case CRYPTO_RIPEMD160_HMAC:
774 info.authsize = RIPEMD160_HASH_LEN;
775 info.authkey = 20;
776 break;
777 default:
778 dprintk("%s(%s) - bad mac\n", __FUNCTION__, CIOCGSESSSTR);
779 error = EINVAL;
780 goto bail;
781 }
782
783 if (info.blocksize) {
784 crie.cri_alg = sop.cipher;
785 crie.cri_klen = sop.keylen * 8;
786 if ((info.maxkey && sop.keylen > info.maxkey) ||
787 sop.keylen < info.minkey) {
788 dprintk("%s(%s) - bad key\n", __FUNCTION__, CIOCGSESSSTR);
789 error = EINVAL;
790 goto bail;
791 }
792
793 crie.cri_key = (u_int8_t *) kmalloc(crie.cri_klen/8+1, GFP_KERNEL);
794 if (copy_from_user(crie.cri_key, sop.key,
795 crie.cri_klen/8)) {
796 dprintk("%s(%s) - bad copy\n", __FUNCTION__, CIOCGSESSSTR);
797 error = EFAULT;
798 goto bail;
799 }
800 if (info.authsize)
801 crie.cri_next = &cria;
802 }
803
804 if (info.authsize) {
805 cria.cri_alg = sop.mac;
806 cria.cri_klen = sop.mackeylen * 8;
807 if (info.authkey && sop.mackeylen != info.authkey) {
808 dprintk("%s(%s) - mackeylen %d != %d\n", __FUNCTION__,
809 CIOCGSESSSTR, sop.mackeylen, info.authkey);
810 error = EINVAL;
811 goto bail;
812 }
813
814 if (cria.cri_klen) {
815 cria.cri_key = (u_int8_t *) kmalloc(cria.cri_klen/8,GFP_KERNEL);
816 if (copy_from_user(cria.cri_key, sop.mackey,
817 cria.cri_klen / 8)) {
818 dprintk("%s(%s) - bad copy\n", __FUNCTION__, CIOCGSESSSTR);
819 error = EFAULT;
820 goto bail;
821 }
822 }
823 }
824
825 /* NB: CIOGSESSION2 has the crid */
826 if (cmd == CIOCGSESSION2) {
827 crid = sop.crid;
828 error = checkcrid(crid);
829 if (error) {
830 dprintk("%s(%s) - checkcrid %x\n", __FUNCTION__,
831 CIOCGSESSSTR, error);
832 goto bail;
833 }
834 } else {
835 /* allow either HW or SW to be used */
836 crid = CRYPTOCAP_F_HARDWARE | CRYPTOCAP_F_SOFTWARE;
837 }
838 error = crypto_newsession(&sid, (info.blocksize ? &crie : &cria), crid);
839 if (error) {
840 dprintk("%s(%s) - newsession %d\n",__FUNCTION__,CIOCGSESSSTR,error);
841 goto bail;
842 }
843
844 cse = csecreate(fcr, sid, &crie, &cria, &info);
845 if (cse == NULL) {
846 crypto_freesession(sid);
847 error = EINVAL;
848 dprintk("%s(%s) - csecreate failed\n", __FUNCTION__, CIOCGSESSSTR);
849 goto bail;
850 }
851 sop.ses = cse->ses;
852
853 if (cmd == CIOCGSESSION2) {
854 /* return hardware/driver id */
855 sop.crid = CRYPTO_SESID2HID(cse->sid);
856 }
857
858 if (copy_to_user((void*)arg, &sop, (cmd == CIOCGSESSION) ?
859 sizeof(struct session_op) : sizeof(sop))) {
860 dprintk("%s(%s) - bad copy\n", __FUNCTION__, CIOCGSESSSTR);
861 error = EFAULT;
862 }
863 bail:
864 if (error) {
865 dprintk("%s(%s) - bail %d\n", __FUNCTION__, CIOCGSESSSTR, error);
866 if (crie.cri_key)
867 kfree(crie.cri_key);
868 if (cria.cri_key)
869 kfree(cria.cri_key);
870 }
871 break;
872 case CIOCFSESSION:
873 dprintk("%s(CIOCFSESSION)\n", __FUNCTION__);
874 get_user(ses, (uint32_t*)arg);
875 cse = csefind(fcr, ses);
876 if (cse == NULL) {
877 error = EINVAL;
878 dprintk("%s(CIOCFSESSION) - Fail %d\n", __FUNCTION__, error);
879 break;
880 }
881 csedelete(fcr, cse);
882 error = csefree(cse);
883 break;
884 case CIOCCRYPT:
885 dprintk("%s(CIOCCRYPT)\n", __FUNCTION__);
886 if(copy_from_user(&cop, (void*)arg, sizeof(cop))) {
887 dprintk("%s(CIOCCRYPT) - bad copy\n", __FUNCTION__);
888 error = EFAULT;
889 goto bail;
890 }
891 cse = csefind(fcr, cop.ses);
892 if (cse == NULL) {
893 error = EINVAL;
894 dprintk("%s(CIOCCRYPT) - Fail %d\n", __FUNCTION__, error);
895 break;
896 }
897 error = cryptodev_op(cse, &cop);
898 if(copy_to_user((void*)arg, &cop, sizeof(cop))) {
899 dprintk("%s(CIOCCRYPT) - bad return copy\n", __FUNCTION__);
900 error = EFAULT;
901 goto bail;
902 }
903 break;
904 case CIOCKEY:
905 case CIOCKEY2:
906 dprintk("%s(CIOCKEY)\n", __FUNCTION__);
907 if (!crypto_userasymcrypto)
908 return (EPERM); /* XXX compat? */
909 if(copy_from_user(&kop, (void*)arg, sizeof(kop))) {
910 dprintk("%s(CIOCKEY) - bad copy\n", __FUNCTION__);
911 error = EFAULT;
912 goto bail;
913 }
914 if (cmd == CIOCKEY) {
915 /* NB: crypto core enforces s/w driver use */
916 kop.crk_crid =
917 CRYPTOCAP_F_HARDWARE | CRYPTOCAP_F_SOFTWARE;
918 }
919 error = cryptodev_key(&kop);
920 if(copy_to_user((void*)arg, &kop, sizeof(kop))) {
921 dprintk("%s(CIOCGKEY) - bad return copy\n", __FUNCTION__);
922 error = EFAULT;
923 goto bail;
924 }
925 break;
926 case CIOCASYMFEAT:
927 dprintk("%s(CIOCASYMFEAT)\n", __FUNCTION__);
928 if (!crypto_userasymcrypto) {
929 /*
930 * NB: if user asym crypto operations are
931 * not permitted return "no algorithms"
932 * so well-behaved applications will just
933 * fallback to doing them in software.
934 */
935 feat = 0;
936 } else
937 error = crypto_getfeat(&feat);
938 if (!error) {
939 error = copy_to_user((void*)arg, &feat, sizeof(feat));
940 }
941 break;
942 case CIOCFINDDEV:
943 if (copy_from_user(&fop, (void*)arg, sizeof(fop))) {
944 dprintk("%s(CIOCFINDDEV) - bad copy\n", __FUNCTION__);
945 error = EFAULT;
946 goto bail;
947 }
948 error = cryptodev_find(&fop);
949 if (copy_to_user((void*)arg, &fop, sizeof(fop))) {
950 dprintk("%s(CIOCFINDDEV) - bad return copy\n", __FUNCTION__);
951 error = EFAULT;
952 goto bail;
953 }
954 break;
955 default:
956 dprintk("%s(unknown ioctl 0x%x)\n", __FUNCTION__, cmd);
957 error = EINVAL;
958 break;
959 }
960 return(-error);
961 }
962
963 #ifdef HAVE_UNLOCKED_IOCTL
964 static long
965 cryptodev_unlocked_ioctl(
966 struct file *filp,
967 unsigned int cmd,
968 unsigned long arg)
969 {
970 return cryptodev_ioctl(NULL, filp, cmd, arg);
971 }
972 #endif
973
974 static int
975 cryptodev_open(struct inode *inode, struct file *filp)
976 {
977 struct fcrypt *fcr;
978
979 dprintk("%s()\n", __FUNCTION__);
980 if (filp->private_data) {
981 printk("cryptodev: Private data already exists !\n");
982 return(0);
983 }
984
985 fcr = kmalloc(sizeof(*fcr), GFP_KERNEL);
986 if (!fcr) {
987 dprintk("%s() - malloc failed\n", __FUNCTION__);
988 return(-ENOMEM);
989 }
990 memset(fcr, 0, sizeof(*fcr));
991
992 INIT_LIST_HEAD(&fcr->csessions);
993 filp->private_data = fcr;
994 return(0);
995 }
996
997 static int
998 cryptodev_release(struct inode *inode, struct file *filp)
999 {
1000 struct fcrypt *fcr = filp->private_data;
1001 struct csession *cse, *tmp;
1002
1003 dprintk("%s()\n", __FUNCTION__);
1004 if (!filp) {
1005 printk("cryptodev: No private data on release\n");
1006 return(0);
1007 }
1008
1009 list_for_each_entry_safe(cse, tmp, &fcr->csessions, list) {
1010 list_del(&cse->list);
1011 (void)csefree(cse);
1012 }
1013 filp->private_data = NULL;
1014 kfree(fcr);
1015 return(0);
1016 }
1017
1018 static struct file_operations cryptodev_fops = {
1019 .owner = THIS_MODULE,
1020 .open = cryptodev_open,
1021 .release = cryptodev_release,
1022 .ioctl = cryptodev_ioctl,
1023 #ifdef HAVE_UNLOCKED_IOCTL
1024 .unlocked_ioctl = cryptodev_unlocked_ioctl,
1025 #endif
1026 };
1027
1028 static struct miscdevice cryptodev = {
1029 .minor = CRYPTODEV_MINOR,
1030 .name = "crypto",
1031 .fops = &cryptodev_fops,
1032 };
1033
1034 static int __init
1035 cryptodev_init(void)
1036 {
1037 int rc;
1038
1039 dprintk("%s(%p)\n", __FUNCTION__, cryptodev_init);
1040 rc = misc_register(&cryptodev);
1041 if (rc) {
1042 printk(KERN_ERR "cryptodev: registration of /dev/crypto failed\n");
1043 return(rc);
1044 }
1045
1046 return(0);
1047 }
1048
1049 static void __exit
1050 cryptodev_exit(void)
1051 {
1052 dprintk("%s()\n", __FUNCTION__);
1053 misc_deregister(&cryptodev);
1054 }
1055
1056 module_init(cryptodev_init);
1057 module_exit(cryptodev_exit);
1058
1059 MODULE_LICENSE("BSD");
1060 MODULE_AUTHOR("David McCullough <david_mccullough@mcafee.com>");
1061 MODULE_DESCRIPTION("Cryptodev (user interface to OCF)");
OpenWrt Source Repository