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(2,6,33))
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
69extern asmlinkage long sys_dup(unsigned int fildes);
70
71#define debug cryptodev_debug
72int cryptodev_debug = 0;
73module_param(cryptodev_debug, int, 0644);
74MODULE_PARM_DESC(cryptodev_debug, "Enable cryptodev debug");
75
76struct 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
87struct 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
112struct fcrypt {
113    struct list_head csessions;
114    int sesn;
115};
116
117static struct csession *csefind(struct fcrypt *, u_int);
118static int csedelete(struct fcrypt *, struct csession *);
119static struct csession *cseadd(struct fcrypt *, struct csession *);
120static struct csession *csecreate(struct fcrypt *, u_int64_t,
121        struct cryptoini *crie, struct cryptoini *cria, struct csession_info *);
122static int csefree(struct csession *);
123
124static int cryptodev_op(struct csession *, struct crypt_op *);
125static int cryptodev_key(struct crypt_kop *);
126static int cryptodev_find(struct crypt_find_op *);
127
128static int cryptodev_cb(void *);
129static 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 */
135static int
136checkcrid(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
168static int
169cryptodev_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
363bail:
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
372static int
373cryptodev_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
399static int
400cryptodevkey_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
408static int
409cryptodev_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
514fail:
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
526static int
527cryptodev_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
545static struct csession *
546csefind(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
557static int
558csedelete(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    
572static struct csession *
573cseadd(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
581static struct csession *
582csecreate(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
608static int
609csefree(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
623static int
624cryptodev_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        }
866bail:
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
967static long
968cryptodev_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
977static int
978cryptodev_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
1006static int
1007cryptodev_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
1027static 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
1039static struct miscdevice cryptodev = {
1040    .minor = CRYPTODEV_MINOR,
1041    .name = "crypto",
1042    .fops = &cryptodev_fops,
1043};
1044
1045static int __init
1046cryptodev_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
1060static void __exit
1061cryptodev_exit(void)
1062{
1063    dprintk("%s()\n", __FUNCTION__);
1064    misc_deregister(&cryptodev);
1065}
1066
1067module_init(cryptodev_init);
1068module_exit(cryptodev_exit);
1069
1070MODULE_LICENSE("BSD");
1071MODULE_AUTHOR("David McCullough <david_mccullough@mcafee.com>");
1072MODULE_DESCRIPTION("Cryptodev (user interface to OCF)");
1073

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