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[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 #include <linux/version.h>
43 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,33))
44 #include <generated/autoconf.h>
45 #else
46 #include <linux/autoconf.h>
47 #endif
48 #include <linux/types.h>
49 #include <linux/time.h>
50 #include <linux/delay.h>
51 #include <linux/list.h>
52 #include <linux/init.h>
53 #include <linux/sched.h>
54 #include <linux/unistd.h>
55 #include <linux/module.h>
56 #include <linux/wait.h>
57 #include <linux/slab.h>
58 #include <linux/fs.h>
59 #include <linux/dcache.h>
60 #include <linux/file.h>
61 #include <linux/mount.h>
62 #include <linux/miscdevice.h>
63 #include <linux/version.h>
64 #include <asm/uaccess.h>
65
66 #include <cryptodev.h>
67 #include <uio.h>
68
69 extern asmlinkage long sys_dup(unsigned int fildes);
70
71 #define debug cryptodev_debug
72 int cryptodev_debug = 0;
73 module_param(cryptodev_debug, int, 0644);
74 MODULE_PARM_DESC(cryptodev_debug, "Enable cryptodev debug");
75
76 struct csession_info {
77 u_int16_t blocksize;
78 u_int16_t minkey, maxkey;
79
80 u_int16_t keysize;
81 /* u_int16_t hashsize; */
82 u_int16_t authsize;
83 u_int16_t authkey;
84 /* u_int16_t ctxsize; */
85 };
86
87 struct csession {
88 struct list_head list;
89 u_int64_t sid;
90 u_int32_t ses;
91
92 wait_queue_head_t waitq;
93
94 u_int32_t cipher;
95
96 u_int32_t mac;
97
98 caddr_t key;
99 int keylen;
100 u_char tmp_iv[EALG_MAX_BLOCK_LEN];
101
102 caddr_t mackey;
103 int mackeylen;
104
105 struct csession_info info;
106
107 struct iovec iovec;
108 struct uio uio;
109 int error;
110 };
111
112 struct fcrypt {
113 struct list_head csessions;
114 int sesn;
115 };
116
117 static struct csession *csefind(struct fcrypt *, u_int);
118 static int csedelete(struct fcrypt *, struct csession *);
119 static struct csession *cseadd(struct fcrypt *, struct csession *);
120 static struct csession *csecreate(struct fcrypt *, u_int64_t,
121 struct cryptoini *crie, struct cryptoini *cria, struct csession_info *);
122 static int csefree(struct csession *);
123
124 static int cryptodev_op(struct csession *, struct crypt_op *);
125 static int cryptodev_key(struct crypt_kop *);
126 static int cryptodev_find(struct crypt_find_op *);
127
128 static int cryptodev_cb(void *);
129 static int cryptodev_open(struct inode *inode, struct file *filp);
130
131 /*
132 * Check a crypto identifier to see if it requested
133 * a valid crid and it's capabilities match.
134 */
135 static int
136 checkcrid(int crid)
137 {
138 int hid = crid & ~(CRYPTOCAP_F_SOFTWARE | CRYPTOCAP_F_HARDWARE);
139 int typ = crid & (CRYPTOCAP_F_SOFTWARE | CRYPTOCAP_F_HARDWARE);
140 int caps = 0;
141
142 /* if the user hasn't selected a driver, then just call newsession */
143 if (hid == 0 && typ != 0)
144 return 0;
145
146 caps = crypto_getcaps(hid);
147
148 /* didn't find anything with capabilities */
149 if (caps == 0) {
150 dprintk("%s: hid=%x typ=%x not matched\n", __FUNCTION__, hid, typ);
151 return EINVAL;
152 }
153
154 /* the user didn't specify SW or HW, so the driver is ok */
155 if (typ == 0)
156 return 0;
157
158 /* if the type specified didn't match */
159 if (typ != (caps & (CRYPTOCAP_F_SOFTWARE | CRYPTOCAP_F_HARDWARE))) {
160 dprintk("%s: hid=%x typ=%x caps=%x not matched\n", __FUNCTION__,
161 hid, typ, caps);
162 return EINVAL;
163 }
164
165 return 0;
166 }
167
168 static int
169 cryptodev_op(struct csession *cse, struct crypt_op *cop)
170 {
171 struct cryptop *crp = NULL;
172 struct cryptodesc *crde = NULL, *crda = NULL;
173 int error = 0;
174
175 dprintk("%s()\n", __FUNCTION__);
176 if (cop->len > CRYPTO_MAX_DATA_LEN) {
177 dprintk("%s: %d > %d\n", __FUNCTION__, cop->len, CRYPTO_MAX_DATA_LEN);
178 return (E2BIG);
179 }
180
181 if (cse->info.blocksize && (cop->len % cse->info.blocksize) != 0) {
182 dprintk("%s: blocksize=%d len=%d\n", __FUNCTION__, cse->info.blocksize,
183 cop->len);
184 return (EINVAL);
185 }
186
187 cse->uio.uio_iov = &cse->iovec;
188 cse->uio.uio_iovcnt = 1;
189 cse->uio.uio_offset = 0;
190 #if 0
191 cse->uio.uio_resid = cop->len;
192 cse->uio.uio_segflg = UIO_SYSSPACE;
193 cse->uio.uio_rw = UIO_WRITE;
194 cse->uio.uio_td = td;
195 #endif
196 cse->uio.uio_iov[0].iov_len = cop->len;
197 if (cse->info.authsize)
198 cse->uio.uio_iov[0].iov_len += cse->info.authsize;
199 cse->uio.uio_iov[0].iov_base = kmalloc(cse->uio.uio_iov[0].iov_len,
200 GFP_KERNEL);
201
202 if (cse->uio.uio_iov[0].iov_base == NULL) {
203 dprintk("%s: iov_base kmalloc(%d) failed\n", __FUNCTION__,
204 (int)cse->uio.uio_iov[0].iov_len);
205 return (ENOMEM);
206 }
207
208 crp = crypto_getreq((cse->info.blocksize != 0) + (cse->info.authsize != 0));
209 if (crp == NULL) {
210 dprintk("%s: ENOMEM\n", __FUNCTION__);
211 error = ENOMEM;
212 goto bail;
213 }
214
215 if (cse->info.authsize && cse->info.blocksize) {
216 if (cop->op == COP_ENCRYPT) {
217 crde = crp->crp_desc;
218 crda = crde->crd_next;
219 } else {
220 crda = crp->crp_desc;
221 crde = crda->crd_next;
222 }
223 } else if (cse->info.authsize) {
224 crda = crp->crp_desc;
225 } else if (cse->info.blocksize) {
226 crde = crp->crp_desc;
227 } else {
228 dprintk("%s: bad request\n", __FUNCTION__);
229 error = EINVAL;
230 goto bail;
231 }
232
233 if ((error = copy_from_user(cse->uio.uio_iov[0].iov_base, cop->src,
234 cop->len))) {
235 dprintk("%s: bad copy\n", __FUNCTION__);
236 goto bail;
237 }
238
239 if (crda) {
240 crda->crd_skip = 0;
241 crda->crd_len = cop->len;
242 crda->crd_inject = cop->len;
243
244 crda->crd_alg = cse->mac;
245 crda->crd_key = cse->mackey;
246 crda->crd_klen = cse->mackeylen * 8;
247 }
248
249 if (crde) {
250 if (cop->op == COP_ENCRYPT)
251 crde->crd_flags |= CRD_F_ENCRYPT;
252 else
253 crde->crd_flags &= ~CRD_F_ENCRYPT;
254 crde->crd_len = cop->len;
255 crde->crd_inject = 0;
256
257 crde->crd_alg = cse->cipher;
258 crde->crd_key = cse->key;
259 crde->crd_klen = cse->keylen * 8;
260 }
261
262 crp->crp_ilen = cse->uio.uio_iov[0].iov_len;
263 crp->crp_flags = CRYPTO_F_IOV | CRYPTO_F_CBIMM
264 | (cop->flags & COP_F_BATCH);
265 crp->crp_buf = (caddr_t)&cse->uio;
266 crp->crp_callback = (int (*) (struct cryptop *)) cryptodev_cb;
267 crp->crp_sid = cse->sid;
268 crp->crp_opaque = (void *)cse;
269
270 if (cop->iv) {
271 if (crde == NULL) {
272 error = EINVAL;
273 dprintk("%s no crde\n", __FUNCTION__);
274 goto bail;
275 }
276 if (cse->cipher == CRYPTO_ARC4) { /* XXX use flag? */
277 error = EINVAL;
278 dprintk("%s arc4 with IV\n", __FUNCTION__);
279 goto bail;
280 }
281 if ((error = copy_from_user(cse->tmp_iv, cop->iv,
282 cse->info.blocksize))) {
283 dprintk("%s bad iv copy\n", __FUNCTION__);
284 goto bail;
285 }
286 memcpy(crde->crd_iv, cse->tmp_iv, cse->info.blocksize);
287 crde->crd_flags |= CRD_F_IV_EXPLICIT | CRD_F_IV_PRESENT;
288 crde->crd_skip = 0;
289 } else if (cse->cipher == CRYPTO_ARC4) { /* XXX use flag? */
290 crde->crd_skip = 0;
291 } else if (crde) {
292 crde->crd_flags |= CRD_F_IV_PRESENT;
293 crde->crd_skip = cse->info.blocksize;
294 crde->crd_len -= cse->info.blocksize;
295 }
296
297 if (cop->mac && crda == NULL) {
298 error = EINVAL;
299 dprintk("%s no crda\n", __FUNCTION__);
300 goto bail;
301 }
302
303 /*
304 * Let the dispatch run unlocked, then, interlock against the
305 * callback before checking if the operation completed and going
306 * to sleep. This insures drivers don't inherit our lock which
307 * results in a lock order reversal between crypto_dispatch forced
308 * entry and the crypto_done callback into us.
309 */
310 error = crypto_dispatch(crp);
311 if (error) {
312 dprintk("%s error in crypto_dispatch\n", __FUNCTION__);
313 goto bail;
314 }
315
316 dprintk("%s about to WAIT\n", __FUNCTION__);
317 /*
318 * we really need to wait for driver to complete to maintain
319 * state, luckily interrupts will be remembered
320 */
321 do {
322 error = wait_event_interruptible(crp->crp_waitq,
323 ((crp->crp_flags & CRYPTO_F_DONE) != 0));
324 /*
325 * we can't break out of this loop or we will leave behind
326 * a huge mess, however, staying here means if your driver
327 * is broken user applications can hang and not be killed.
328 * The solution, fix your driver :-)
329 */
330 if (error) {
331 schedule();
332 error = 0;
333 }
334 } while ((crp->crp_flags & CRYPTO_F_DONE) == 0);
335 dprintk("%s finished WAITING error=%d\n", __FUNCTION__, error);
336
337 if (crp->crp_etype != 0) {
338 error = crp->crp_etype;
339 dprintk("%s error in crp processing\n", __FUNCTION__);
340 goto bail;
341 }
342
343 if (cse->error) {
344 error = cse->error;
345 dprintk("%s error in cse processing\n", __FUNCTION__);
346 goto bail;
347 }
348
349 if (cop->dst && (error = copy_to_user(cop->dst,
350 cse->uio.uio_iov[0].iov_base, cop->len))) {
351 dprintk("%s bad dst copy\n", __FUNCTION__);
352 goto bail;
353 }
354
355 if (cop->mac &&
356 (error=copy_to_user(cop->mac,
357 (caddr_t)cse->uio.uio_iov[0].iov_base + cop->len,
358 cse->info.authsize))) {
359 dprintk("%s bad mac copy\n", __FUNCTION__);
360 goto bail;
361 }
362
363 bail:
364 if (crp)
365 crypto_freereq(crp);
366 if (cse->uio.uio_iov[0].iov_base)
367 kfree(cse->uio.uio_iov[0].iov_base);
368
369 return (error);
370 }
371
372 static int
373 cryptodev_cb(void *op)
374 {
375 struct cryptop *crp = (struct cryptop *) op;
376 struct csession *cse = (struct csession *)crp->crp_opaque;
377 int error;
378
379 dprintk("%s()\n", __FUNCTION__);
380 error = crp->crp_etype;
381 if (error == EAGAIN) {
382 crp->crp_flags &= ~CRYPTO_F_DONE;
383 #ifdef NOTYET
384 /*
385 * DAVIDM I am fairly sure that we should turn this into a batch
386 * request to stop bad karma/lockup, revisit
387 */
388 crp->crp_flags |= CRYPTO_F_BATCH;
389 #endif
390 return crypto_dispatch(crp);
391 }
392 if (error != 0 || (crp->crp_flags & CRYPTO_F_DONE)) {
393 cse->error = error;
394 wake_up_interruptible(&crp->crp_waitq);
395 }
396 return (0);
397 }
398
399 static int
400 cryptodevkey_cb(void *op)
401 {
402 struct cryptkop *krp = (struct cryptkop *) op;
403 dprintk("%s()\n", __FUNCTION__);
404 wake_up_interruptible(&krp->krp_waitq);
405 return (0);
406 }
407
408 static int
409 cryptodev_key(struct crypt_kop *kop)
410 {
411 struct cryptkop *krp = NULL;
412 int error = EINVAL;
413 int in, out, size, i;
414
415 dprintk("%s()\n", __FUNCTION__);
416 if (kop->crk_iparams + kop->crk_oparams > CRK_MAXPARAM) {
417 dprintk("%s params too big\n", __FUNCTION__);
418 return (EFBIG);
419 }
420
421 in = kop->crk_iparams;
422 out = kop->crk_oparams;
423 switch (kop->crk_op) {
424 case CRK_MOD_EXP:
425 if (in == 3 && out == 1)
426 break;
427 return (EINVAL);
428 case CRK_MOD_EXP_CRT:
429 if (in == 6 && out == 1)
430 break;
431 return (EINVAL);
432 case CRK_DSA_SIGN:
433 if (in == 5 && out == 2)
434 break;
435 return (EINVAL);
436 case CRK_DSA_VERIFY:
437 if (in == 7 && out == 0)
438 break;
439 return (EINVAL);
440 case CRK_DH_COMPUTE_KEY:
441 if (in == 3 && out == 1)
442 break;
443 return (EINVAL);
444 default:
445 return (EINVAL);
446 }
447
448 krp = (struct cryptkop *)kmalloc(sizeof *krp, GFP_KERNEL);
449 if (!krp)
450 return (ENOMEM);
451 bzero(krp, sizeof *krp);
452 krp->krp_op = kop->crk_op;
453 krp->krp_status = kop->crk_status;
454 krp->krp_iparams = kop->crk_iparams;
455 krp->krp_oparams = kop->crk_oparams;
456 krp->krp_crid = kop->crk_crid;
457 krp->krp_status = 0;
458 krp->krp_flags = CRYPTO_KF_CBIMM;
459 krp->krp_callback = (int (*) (struct cryptkop *)) cryptodevkey_cb;
460 init_waitqueue_head(&krp->krp_waitq);
461
462 for (i = 0; i < CRK_MAXPARAM; i++)
463 krp->krp_param[i].crp_nbits = kop->crk_param[i].crp_nbits;
464 for (i = 0; i < krp->krp_iparams + krp->krp_oparams; i++) {
465 size = (krp->krp_param[i].crp_nbits + 7) / 8;
466 if (size == 0)
467 continue;
468 krp->krp_param[i].crp_p = (caddr_t) kmalloc(size, GFP_KERNEL);
469 if (i >= krp->krp_iparams)
470 continue;
471 error = copy_from_user(krp->krp_param[i].crp_p,
472 kop->crk_param[i].crp_p, size);
473 if (error)
474 goto fail;
475 }
476
477 error = crypto_kdispatch(krp);
478 if (error)
479 goto fail;
480
481 do {
482 error = wait_event_interruptible(krp->krp_waitq,
483 ((krp->krp_flags & CRYPTO_KF_DONE) != 0));
484 /*
485 * we can't break out of this loop or we will leave behind
486 * a huge mess, however, staying here means if your driver
487 * is broken user applications can hang and not be killed.
488 * The solution, fix your driver :-)
489 */
490 if (error) {
491 schedule();
492 error = 0;
493 }
494 } while ((krp->krp_flags & CRYPTO_KF_DONE) == 0);
495
496 dprintk("%s finished WAITING error=%d\n", __FUNCTION__, error);
497
498 kop->crk_crid = krp->krp_crid; /* device that did the work */
499 if (krp->krp_status != 0) {
500 error = krp->krp_status;
501 goto fail;
502 }
503
504 for (i = krp->krp_iparams; i < krp->krp_iparams + krp->krp_oparams; i++) {
505 size = (krp->krp_param[i].crp_nbits + 7) / 8;
506 if (size == 0)
507 continue;
508 error = copy_to_user(kop->crk_param[i].crp_p, krp->krp_param[i].crp_p,
509 size);
510 if (error)
511 goto fail;
512 }
513
514 fail:
515 if (krp) {
516 kop->crk_status = krp->krp_status;
517 for (i = 0; i < CRK_MAXPARAM; i++) {
518 if (krp->krp_param[i].crp_p)
519 kfree(krp->krp_param[i].crp_p);
520 }
521 kfree(krp);
522 }
523 return (error);
524 }
525
526 static int
527 cryptodev_find(struct crypt_find_op *find)
528 {
529 device_t dev;
530
531 if (find->crid != -1) {
532 dev = crypto_find_device_byhid(find->crid);
533 if (dev == NULL)
534 return (ENOENT);
535 strlcpy(find->name, device_get_nameunit(dev),
536 sizeof(find->name));
537 } else {
538 find->crid = crypto_find_driver(find->name);
539 if (find->crid == -1)
540 return (ENOENT);
541 }
542 return (0);
543 }
544
545 static struct csession *
546 csefind(struct fcrypt *fcr, u_int ses)
547 {
548 struct csession *cse;
549
550 dprintk("%s()\n", __FUNCTION__);
551 list_for_each_entry(cse, &fcr->csessions, list)
552 if (cse->ses == ses)
553 return (cse);
554 return (NULL);
555 }
556
557 static int
558 csedelete(struct fcrypt *fcr, struct csession *cse_del)
559 {
560 struct csession *cse;
561
562 dprintk("%s()\n", __FUNCTION__);
563 list_for_each_entry(cse, &fcr->csessions, list) {
564 if (cse == cse_del) {
565 list_del(&cse->list);
566 return (1);
567 }
568 }
569 return (0);
570 }
571
572 static struct csession *
573 cseadd(struct fcrypt *fcr, struct csession *cse)
574 {
575 dprintk("%s()\n", __FUNCTION__);
576 list_add_tail(&cse->list, &fcr->csessions);
577 cse->ses = fcr->sesn++;
578 return (cse);
579 }
580
581 static struct csession *
582 csecreate(struct fcrypt *fcr, u_int64_t sid, struct cryptoini *crie,
583 struct cryptoini *cria, struct csession_info *info)
584 {
585 struct csession *cse;
586
587 dprintk("%s()\n", __FUNCTION__);
588 cse = (struct csession *) kmalloc(sizeof(struct csession), GFP_KERNEL);
589 if (cse == NULL)
590 return NULL;
591 memset(cse, 0, sizeof(struct csession));
592
593 INIT_LIST_HEAD(&cse->list);
594 init_waitqueue_head(&cse->waitq);
595
596 cse->key = crie->cri_key;
597 cse->keylen = crie->cri_klen/8;
598 cse->mackey = cria->cri_key;
599 cse->mackeylen = cria->cri_klen/8;
600 cse->sid = sid;
601 cse->cipher = crie->cri_alg;
602 cse->mac = cria->cri_alg;
603 cse->info = *info;
604 cseadd(fcr, cse);
605 return (cse);
606 }
607
608 static int
609 csefree(struct csession *cse)
610 {
611 int error;
612
613 dprintk("%s()\n", __FUNCTION__);
614 error = crypto_freesession(cse->sid);
615 if (cse->key)
616 kfree(cse->key);
617 if (cse->mackey)
618 kfree(cse->mackey);
619 kfree(cse);
620 return(error);
621 }
622
623 static int
624 cryptodev_ioctl(
625 struct inode *inode,
626 struct file *filp,
627 unsigned int cmd,
628 unsigned long arg)
629 {
630 struct cryptoini cria, crie;
631 struct fcrypt *fcr = filp->private_data;
632 struct csession *cse;
633 struct csession_info info;
634 struct session2_op sop;
635 struct crypt_op cop;
636 struct crypt_kop kop;
637 struct crypt_find_op fop;
638 u_int64_t sid;
639 u_int32_t ses = 0;
640 int feat, fd, error = 0, crid;
641 mm_segment_t fs;
642
643 dprintk("%s(cmd=%x arg=%lx)\n", __FUNCTION__, cmd, arg);
644
645 switch (cmd) {
646
647 case CRIOGET: {
648 dprintk("%s(CRIOGET)\n", __FUNCTION__);
649 fs = get_fs();
650 set_fs(get_ds());
651 for (fd = 0; fd < files_fdtable(current->files)->max_fds; fd++)
652 if (files_fdtable(current->files)->fd[fd] == filp)
653 break;
654 fd = sys_dup(fd);
655 set_fs(fs);
656 put_user(fd, (int *) arg);
657 return IS_ERR_VALUE(fd) ? fd : 0;
658 }
659
660 #define CIOCGSESSSTR (cmd == CIOCGSESSION ? "CIOCGSESSION" : "CIOCGSESSION2")
661 case CIOCGSESSION:
662 case CIOCGSESSION2:
663 dprintk("%s(%s)\n", __FUNCTION__, CIOCGSESSSTR);
664 memset(&crie, 0, sizeof(crie));
665 memset(&cria, 0, sizeof(cria));
666 memset(&info, 0, sizeof(info));
667 memset(&sop, 0, sizeof(sop));
668
669 if (copy_from_user(&sop, (void*)arg, (cmd == CIOCGSESSION) ?
670 sizeof(struct session_op) : sizeof(sop))) {
671 dprintk("%s(%s) - bad copy\n", __FUNCTION__, CIOCGSESSSTR);
672 error = EFAULT;
673 goto bail;
674 }
675
676 switch (sop.cipher) {
677 case 0:
678 dprintk("%s(%s) - no cipher\n", __FUNCTION__, CIOCGSESSSTR);
679 break;
680 case CRYPTO_NULL_CBC:
681 info.blocksize = NULL_BLOCK_LEN;
682 info.minkey = NULL_MIN_KEY_LEN;
683 info.maxkey = NULL_MAX_KEY_LEN;
684 break;
685 case CRYPTO_DES_CBC:
686 info.blocksize = DES_BLOCK_LEN;
687 info.minkey = DES_MIN_KEY_LEN;
688 info.maxkey = DES_MAX_KEY_LEN;
689 break;
690 case CRYPTO_3DES_CBC:
691 info.blocksize = DES3_BLOCK_LEN;
692 info.minkey = DES3_MIN_KEY_LEN;
693 info.maxkey = DES3_MAX_KEY_LEN;
694 break;
695 case CRYPTO_BLF_CBC:
696 info.blocksize = BLOWFISH_BLOCK_LEN;
697 info.minkey = BLOWFISH_MIN_KEY_LEN;
698 info.maxkey = BLOWFISH_MAX_KEY_LEN;
699 break;
700 case CRYPTO_CAST_CBC:
701 info.blocksize = CAST128_BLOCK_LEN;
702 info.minkey = CAST128_MIN_KEY_LEN;
703 info.maxkey = CAST128_MAX_KEY_LEN;
704 break;
705 case CRYPTO_SKIPJACK_CBC:
706 info.blocksize = SKIPJACK_BLOCK_LEN;
707 info.minkey = SKIPJACK_MIN_KEY_LEN;
708 info.maxkey = SKIPJACK_MAX_KEY_LEN;
709 break;
710 case CRYPTO_AES_CBC:
711 info.blocksize = AES_BLOCK_LEN;
712 info.minkey = AES_MIN_KEY_LEN;
713 info.maxkey = AES_MAX_KEY_LEN;
714 break;
715 case CRYPTO_ARC4:
716 info.blocksize = ARC4_BLOCK_LEN;
717 info.minkey = ARC4_MIN_KEY_LEN;
718 info.maxkey = ARC4_MAX_KEY_LEN;
719 break;
720 case CRYPTO_CAMELLIA_CBC:
721 info.blocksize = CAMELLIA_BLOCK_LEN;
722 info.minkey = CAMELLIA_MIN_KEY_LEN;
723 info.maxkey = CAMELLIA_MAX_KEY_LEN;
724 break;
725 default:
726 dprintk("%s(%s) - bad cipher\n", __FUNCTION__, CIOCGSESSSTR);
727 error = EINVAL;
728 goto bail;
729 }
730
731 switch (sop.mac) {
732 case 0:
733 dprintk("%s(%s) - no mac\n", __FUNCTION__, CIOCGSESSSTR);
734 break;
735 case CRYPTO_NULL_HMAC:
736 info.authsize = NULL_HASH_LEN;
737 break;
738 case CRYPTO_MD5:
739 info.authsize = MD5_HASH_LEN;
740 break;
741 case CRYPTO_SHA1:
742 info.authsize = SHA1_HASH_LEN;
743 break;
744 case CRYPTO_SHA2_256:
745 info.authsize = SHA2_256_HASH_LEN;
746 break;
747 case CRYPTO_SHA2_384:
748 info.authsize = SHA2_384_HASH_LEN;
749 break;
750 case CRYPTO_SHA2_512:
751 info.authsize = SHA2_512_HASH_LEN;
752 break;
753 case CRYPTO_RIPEMD160:
754 info.authsize = RIPEMD160_HASH_LEN;
755 break;
756 case CRYPTO_MD5_HMAC:
757 info.authsize = MD5_HASH_LEN;
758 info.authkey = 16;
759 break;
760 case CRYPTO_SHA1_HMAC:
761 info.authsize = SHA1_HASH_LEN;
762 info.authkey = 20;
763 break;
764 case CRYPTO_SHA2_256_HMAC:
765 info.authsize = SHA2_256_HASH_LEN;
766 info.authkey = 32;
767 break;
768 case CRYPTO_SHA2_384_HMAC:
769 info.authsize = SHA2_384_HASH_LEN;
770 info.authkey = 48;
771 break;
772 case CRYPTO_SHA2_512_HMAC:
773 info.authsize = SHA2_512_HASH_LEN;
774 info.authkey = 64;
775 break;
776 case CRYPTO_RIPEMD160_HMAC:
777 info.authsize = RIPEMD160_HASH_LEN;
778 info.authkey = 20;
779 break;
780 default:
781 dprintk("%s(%s) - bad mac\n", __FUNCTION__, CIOCGSESSSTR);
782 error = EINVAL;
783 goto bail;
784 }
785
786 if (info.blocksize) {
787 crie.cri_alg = sop.cipher;
788 crie.cri_klen = sop.keylen * 8;
789 if ((info.maxkey && sop.keylen > info.maxkey) ||
790 sop.keylen < info.minkey) {
791 dprintk("%s(%s) - bad key\n", __FUNCTION__, CIOCGSESSSTR);
792 error = EINVAL;
793 goto bail;
794 }
795
796 crie.cri_key = (u_int8_t *) kmalloc(crie.cri_klen/8+1, GFP_KERNEL);
797 if (copy_from_user(crie.cri_key, sop.key,
798 crie.cri_klen/8)) {
799 dprintk("%s(%s) - bad copy\n", __FUNCTION__, CIOCGSESSSTR);
800 error = EFAULT;
801 goto bail;
802 }
803 if (info.authsize)
804 crie.cri_next = &cria;
805 }
806
807 if (info.authsize) {
808 cria.cri_alg = sop.mac;
809 cria.cri_klen = sop.mackeylen * 8;
810 if (info.authkey && sop.mackeylen != info.authkey) {
811 dprintk("%s(%s) - mackeylen %d != %d\n", __FUNCTION__,
812 CIOCGSESSSTR, sop.mackeylen, info.authkey);
813 error = EINVAL;
814 goto bail;
815 }
816
817 if (cria.cri_klen) {
818 cria.cri_key = (u_int8_t *) kmalloc(cria.cri_klen/8,GFP_KERNEL);
819 if (copy_from_user(cria.cri_key, sop.mackey,
820 cria.cri_klen / 8)) {
821 dprintk("%s(%s) - bad copy\n", __FUNCTION__, CIOCGSESSSTR);
822 error = EFAULT;
823 goto bail;
824 }
825 }
826 }
827
828 /* NB: CIOGSESSION2 has the crid */
829 if (cmd == CIOCGSESSION2) {
830 crid = sop.crid;
831 error = checkcrid(crid);
832 if (error) {
833 dprintk("%s(%s) - checkcrid %x\n", __FUNCTION__,
834 CIOCGSESSSTR, error);
835 goto bail;
836 }
837 } else {
838 /* allow either HW or SW to be used */
839 crid = CRYPTOCAP_F_HARDWARE | CRYPTOCAP_F_SOFTWARE;
840 }
841 error = crypto_newsession(&sid, (info.blocksize ? &crie : &cria), crid);
842 if (error) {
843 dprintk("%s(%s) - newsession %d\n",__FUNCTION__,CIOCGSESSSTR,error);
844 goto bail;
845 }
846
847 cse = csecreate(fcr, sid, &crie, &cria, &info);
848 if (cse == NULL) {
849 crypto_freesession(sid);
850 error = EINVAL;
851 dprintk("%s(%s) - csecreate failed\n", __FUNCTION__, CIOCGSESSSTR);
852 goto bail;
853 }
854 sop.ses = cse->ses;
855
856 if (cmd == CIOCGSESSION2) {
857 /* return hardware/driver id */
858 sop.crid = CRYPTO_SESID2HID(cse->sid);
859 }
860
861 if (copy_to_user((void*)arg, &sop, (cmd == CIOCGSESSION) ?
862 sizeof(struct session_op) : sizeof(sop))) {
863 dprintk("%s(%s) - bad copy\n", __FUNCTION__, CIOCGSESSSTR);
864 error = EFAULT;
865 }
866 bail:
867 if (error) {
868 dprintk("%s(%s) - bail %d\n", __FUNCTION__, CIOCGSESSSTR, error);
869 if (crie.cri_key)
870 kfree(crie.cri_key);
871 if (cria.cri_key)
872 kfree(cria.cri_key);
873 }
874 break;
875 case CIOCFSESSION:
876 dprintk("%s(CIOCFSESSION)\n", __FUNCTION__);
877 get_user(ses, (uint32_t*)arg);
878 cse = csefind(fcr, ses);
879 if (cse == NULL) {
880 error = EINVAL;
881 dprintk("%s(CIOCFSESSION) - Fail %d\n", __FUNCTION__, error);
882 break;
883 }
884 csedelete(fcr, cse);
885 error = csefree(cse);
886 break;
887 case CIOCCRYPT:
888 dprintk("%s(CIOCCRYPT)\n", __FUNCTION__);
889 if(copy_from_user(&cop, (void*)arg, sizeof(cop))) {
890 dprintk("%s(CIOCCRYPT) - bad copy\n", __FUNCTION__);
891 error = EFAULT;
892 goto bail;
893 }
894 cse = csefind(fcr, cop.ses);
895 if (cse == NULL) {
896 error = EINVAL;
897 dprintk("%s(CIOCCRYPT) - Fail %d\n", __FUNCTION__, error);
898 break;
899 }
900 error = cryptodev_op(cse, &cop);
901 if(copy_to_user((void*)arg, &cop, sizeof(cop))) {
902 dprintk("%s(CIOCCRYPT) - bad return copy\n", __FUNCTION__);
903 error = EFAULT;
904 goto bail;
905 }
906 break;
907 case CIOCKEY:
908 case CIOCKEY2:
909 dprintk("%s(CIOCKEY)\n", __FUNCTION__);
910 if (!crypto_userasymcrypto)
911 return (EPERM); /* XXX compat? */
912 if(copy_from_user(&kop, (void*)arg, sizeof(kop))) {
913 dprintk("%s(CIOCKEY) - bad copy\n", __FUNCTION__);
914 error = EFAULT;
915 goto bail;
916 }
917 if (cmd == CIOCKEY) {
918 /* NB: crypto core enforces s/w driver use */
919 kop.crk_crid =
920 CRYPTOCAP_F_HARDWARE | CRYPTOCAP_F_SOFTWARE;
921 }
922 error = cryptodev_key(&kop);
923 if(copy_to_user((void*)arg, &kop, sizeof(kop))) {
924 dprintk("%s(CIOCGKEY) - bad return copy\n", __FUNCTION__);
925 error = EFAULT;
926 goto bail;
927 }
928 break;
929 case CIOCASYMFEAT:
930 dprintk("%s(CIOCASYMFEAT)\n", __FUNCTION__);
931 if (!crypto_userasymcrypto) {
932 /*
933 * NB: if user asym crypto operations are
934 * not permitted return "no algorithms"
935 * so well-behaved applications will just
936 * fallback to doing them in software.
937 */
938 feat = 0;
939 } else
940 error = crypto_getfeat(&feat);
941 if (!error) {
942 error = copy_to_user((void*)arg, &feat, sizeof(feat));
943 }
944 break;
945 case CIOCFINDDEV:
946 if (copy_from_user(&fop, (void*)arg, sizeof(fop))) {
947 dprintk("%s(CIOCFINDDEV) - bad copy\n", __FUNCTION__);
948 error = EFAULT;
949 goto bail;
950 }
951 error = cryptodev_find(&fop);
952 if (copy_to_user((void*)arg, &fop, sizeof(fop))) {
953 dprintk("%s(CIOCFINDDEV) - bad return copy\n", __FUNCTION__);
954 error = EFAULT;
955 goto bail;
956 }
957 break;
958 default:
959 dprintk("%s(unknown ioctl 0x%x)\n", __FUNCTION__, cmd);
960 error = EINVAL;
961 break;
962 }
963 return(-error);
964 }
965
966 #ifdef HAVE_UNLOCKED_IOCTL
967 static long
968 cryptodev_unlocked_ioctl(
969 struct file *filp,
970 unsigned int cmd,
971 unsigned long arg)
972 {
973 return cryptodev_ioctl(NULL, filp, cmd, arg);
974 }
975 #endif
976
977 static int
978 cryptodev_open(struct inode *inode, struct file *filp)
979 {
980 struct fcrypt *fcr;
981
982 dprintk("%s()\n", __FUNCTION__);
983 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,35)
984 /*
985 * on 2.6.35 private_data points to a miscdevice structure, we override
986 * it, which is currently safe to do.
987 */
988 if (filp->private_data) {
989 printk("cryptodev: Private data already exists - %p!\n", filp->private_data);
990 return(-ENODEV);
991 }
992 #endif
993
994 fcr = kmalloc(sizeof(*fcr), GFP_KERNEL);
995 if (!fcr) {
996 dprintk("%s() - malloc failed\n", __FUNCTION__);
997 return(-ENOMEM);
998 }
999 memset(fcr, 0, sizeof(*fcr));
1000
1001 INIT_LIST_HEAD(&fcr->csessions);
1002 filp->private_data = fcr;
1003 return(0);
1004 }
1005
1006 static int
1007 cryptodev_release(struct inode *inode, struct file *filp)
1008 {
1009 struct fcrypt *fcr = filp->private_data;
1010 struct csession *cse, *tmp;
1011
1012 dprintk("%s()\n", __FUNCTION__);
1013 if (!filp) {
1014 printk("cryptodev: No private data on release\n");
1015 return(0);
1016 }
1017
1018 list_for_each_entry_safe(cse, tmp, &fcr->csessions, list) {
1019 list_del(&cse->list);
1020 (void)csefree(cse);
1021 }
1022 filp->private_data = NULL;
1023 kfree(fcr);
1024 return(0);
1025 }
1026
1027 static struct file_operations cryptodev_fops = {
1028 .owner = THIS_MODULE,
1029 .open = cryptodev_open,
1030 .release = cryptodev_release,
1031 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,36)
1032 .ioctl = cryptodev_ioctl,
1033 #endif
1034 #ifdef HAVE_UNLOCKED_IOCTL
1035 .unlocked_ioctl = cryptodev_unlocked_ioctl,
1036 #endif
1037 };
1038
1039 static struct miscdevice cryptodev = {
1040 .minor = CRYPTODEV_MINOR,
1041 .name = "crypto",
1042 .fops = &cryptodev_fops,
1043 };
1044
1045 static int __init
1046 cryptodev_init(void)
1047 {
1048 int rc;
1049
1050 dprintk("%s(%p)\n", __FUNCTION__, cryptodev_init);
1051 rc = misc_register(&cryptodev);
1052 if (rc) {
1053 printk(KERN_ERR "cryptodev: registration of /dev/crypto failed\n");
1054 return(rc);
1055 }
1056
1057 return(0);
1058 }
1059
1060 static void __exit
1061 cryptodev_exit(void)
1062 {
1063 dprintk("%s()\n", __FUNCTION__);
1064 misc_deregister(&cryptodev);
1065 }
1066
1067 module_init(cryptodev_init);
1068 module_exit(cryptodev_exit);
1069
1070 MODULE_LICENSE("BSD");
1071 MODULE_AUTHOR("David McCullough <david_mccullough@mcafee.com>");
1072 MODULE_DESCRIPTION("Cryptodev (user interface to OCF)");
OpenWrt Source Repository