Root/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(2,6,38) && !defined(AUTOCONF_INCLUDED)
44#include <linux/config.h>
45#endif
46#include <linux/types.h>
47#include <linux/time.h>
48#include <linux/delay.h>
49#include <linux/list.h>
50#include <linux/init.h>
51#include <linux/sched.h>
52#include <linux/unistd.h>
53#include <linux/module.h>
54#include <linux/wait.h>
55#include <linux/slab.h>
56#include <linux/fs.h>
57#include <linux/dcache.h>
58#include <linux/file.h>
59#include <linux/mount.h>
60#include <linux/miscdevice.h>
61#include <asm/uaccess.h>
62
63#include <cryptodev.h>
64#include <uio.h>
65
66extern asmlinkage long sys_dup(unsigned int fildes);
67
68#define debug cryptodev_debug
69int cryptodev_debug = 0;
70module_param(cryptodev_debug, int, 0644);
71MODULE_PARM_DESC(cryptodev_debug, "Enable cryptodev debug");
72
73struct 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
84struct 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
109struct fcrypt {
110    struct list_head csessions;
111    int sesn;
112};
113
114static struct csession *csefind(struct fcrypt *, u_int);
115static int csedelete(struct fcrypt *, struct csession *);
116static struct csession *cseadd(struct fcrypt *, struct csession *);
117static struct csession *csecreate(struct fcrypt *, u_int64_t,
118        struct cryptoini *crie, struct cryptoini *cria, struct csession_info *);
119static int csefree(struct csession *);
120
121static int cryptodev_op(struct csession *, struct crypt_op *);
122static int cryptodev_key(struct crypt_kop *);
123static int cryptodev_find(struct crypt_find_op *);
124
125static int cryptodev_cb(void *);
126static 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 */
132static int
133checkcrid(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
165static int
166cryptodev_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
360bail:
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
369static int
370cryptodev_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
396static int
397cryptodevkey_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
405static int
406cryptodev_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
511fail:
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
523static int
524cryptodev_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
542static struct csession *
543csefind(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
554static int
555csedelete(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    
569static struct csession *
570cseadd(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
578static struct csession *
579csecreate(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
605static int
606csefree(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
620static int
621cryptodev_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        }
863bail:
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
964static long
965cryptodev_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
974static int
975cryptodev_open(struct inode *inode, struct file *filp)
976{
977    struct fcrypt *fcr;
978
979    dprintk("%s()\n", __FUNCTION__);
980#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,35)
981    /*
982     * on 2.6.35 private_data points to a miscdevice structure, we override
983     * it, which is currently safe to do.
984     */
985    if (filp->private_data) {
986        printk("cryptodev: Private data already exists - %p!\n", filp->private_data);
987        return(-ENODEV);
988    }
989#endif
990
991    fcr = kmalloc(sizeof(*fcr), GFP_KERNEL);
992    if (!fcr) {
993        dprintk("%s() - malloc failed\n", __FUNCTION__);
994        return(-ENOMEM);
995    }
996    memset(fcr, 0, sizeof(*fcr));
997
998    INIT_LIST_HEAD(&fcr->csessions);
999    filp->private_data = fcr;
1000    return(0);
1001}
1002
1003static int
1004cryptodev_release(struct inode *inode, struct file *filp)
1005{
1006    struct fcrypt *fcr = filp->private_data;
1007    struct csession *cse, *tmp;
1008
1009    dprintk("%s()\n", __FUNCTION__);
1010    if (!filp) {
1011        printk("cryptodev: No private data on release\n");
1012        return(0);
1013    }
1014
1015    list_for_each_entry_safe(cse, tmp, &fcr->csessions, list) {
1016        list_del(&cse->list);
1017        (void)csefree(cse);
1018    }
1019    filp->private_data = NULL;
1020    kfree(fcr);
1021    return(0);
1022}
1023
1024static struct file_operations cryptodev_fops = {
1025    .owner = THIS_MODULE,
1026    .open = cryptodev_open,
1027    .release = cryptodev_release,
1028#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,36)
1029    .ioctl = cryptodev_ioctl,
1030#endif
1031#ifdef HAVE_UNLOCKED_IOCTL
1032    .unlocked_ioctl = cryptodev_unlocked_ioctl,
1033#endif
1034};
1035
1036static struct miscdevice cryptodev = {
1037    .minor = CRYPTODEV_MINOR,
1038    .name = "crypto",
1039    .fops = &cryptodev_fops,
1040};
1041
1042static int __init
1043cryptodev_init(void)
1044{
1045    int rc;
1046
1047    dprintk("%s(%p)\n", __FUNCTION__, cryptodev_init);
1048    rc = misc_register(&cryptodev);
1049    if (rc) {
1050        printk(KERN_ERR "cryptodev: registration of /dev/crypto failed\n");
1051        return(rc);
1052    }
1053
1054    return(0);
1055}
1056
1057static void __exit
1058cryptodev_exit(void)
1059{
1060    dprintk("%s()\n", __FUNCTION__);
1061    misc_deregister(&cryptodev);
1062}
1063
1064module_init(cryptodev_init);
1065module_exit(cryptodev_exit);
1066
1067MODULE_LICENSE("BSD");
1068MODULE_AUTHOR("David McCullough <david_mccullough@mcafee.com>");
1069MODULE_DESCRIPTION("Cryptodev (user interface to OCF)");
1070

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