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freebsd-nq/sys/opencrypto/cryptodev.c
Robert Watson 5e3f7694b1 Replace custom file descriptor array sleep lock constructed using a mutex 
and flags with an sxlock.  This leads to a significant and measurable
performance improvement as a result of access to shared locking for
frequent lookup operations, reduced general overhead, and reduced overhead
in the event of contention.  All of these are imported for threaded
applications where simultaneous access to a shared file descriptor array
occurs frequently.  Kris has reported 2x-4x transaction rate improvements
on 8-core MySQL benchmarks; smaller improvements can be expected for many
workloads as a result of reduced overhead.

- Generally eliminate the distinction between "fast" and regular
  acquisisition of the filedesc lock; the plan is that they will now all
  be fast.  Change all locking instances to either shared or exclusive
  locks.

- Correct a bug (pointed out by kib) in fdfree() where previously msleep()
  was called without the mutex held; sx_sleep() is now always called with
  the sxlock held exclusively.

- Universally hold the struct file lock over changes to struct file,
  rather than the filedesc lock or no lock.  Always update the f_ops
  field last. A further memory barrier is required here in the future
  (discussed with jhb).

- Improve locking and reference management in linux_at(), which fails to
  properly acquire vnode references before using vnode pointers.  Annotate
  improper use of vn_fullpath(), which will be replaced at a future date.

In fcntl(), we conservatively acquire an exclusive lock, even though in
some cases a shared lock may be sufficient, which should be revisited.
The dropping of the filedesc lock in fdgrowtable() is no longer required
as the sxlock can be held over the sleep operation; we should consider
removing that (pointed out by attilio).

Tested by:	kris
Discussed with:	jhb, kris, attilio, jeff
2007-04-04 09:11:34 +00:00

901 lines
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/* $OpenBSD: cryptodev.c,v 1.52 2002/06/19 07:22:46 deraadt Exp $ */
/*-
* Copyright (c) 2001 Theo de Raadt
* Copyright (c) 2002-2006 Sam Leffler, Errno Consulting
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* Effort sponsored in part by the Defense Advanced Research Projects
* Agency (DARPA) and Air Force Research Laboratory, Air Force
* Materiel Command, USAF, under agreement number F30602-01-2-0537.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/sysctl.h>
#include <sys/file.h>
#include <sys/filedesc.h>
#include <sys/errno.h>
#include <sys/uio.h>
#include <sys/random.h>
#include <sys/conf.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/fcntl.h>
#include <sys/bus.h>
#include <opencrypto/cryptodev.h>
#include <opencrypto/xform.h>
struct csession {
TAILQ_ENTRY(csession) next;
u_int64_t sid;
u_int32_t ses;
struct mtx lock; /* for op submission */
u_int32_t cipher;
struct enc_xform *txform;
u_int32_t mac;
struct auth_hash *thash;
caddr_t key;
int keylen;
u_char tmp_iv[EALG_MAX_BLOCK_LEN];
caddr_t mackey;
int mackeylen;
struct iovec iovec;
struct uio uio;
int error;
};
struct fcrypt {
TAILQ_HEAD(csessionlist, csession) csessions;
int sesn;
};
static int cryptof_rw(struct file *fp, struct uio *uio,
struct ucred *cred, int flags, struct thread *);
static int cryptof_ioctl(struct file *, u_long, void *,
struct ucred *, struct thread *);
static int cryptof_poll(struct file *, int, struct ucred *, struct thread *);
static int cryptof_kqfilter(struct file *, struct knote *);
static int cryptof_stat(struct file *, struct stat *,
struct ucred *, struct thread *);
static int cryptof_close(struct file *, struct thread *);
static struct fileops cryptofops = {
.fo_read = cryptof_rw,
.fo_write = cryptof_rw,
.fo_ioctl = cryptof_ioctl,
.fo_poll = cryptof_poll,
.fo_kqfilter = cryptof_kqfilter,
.fo_stat = cryptof_stat,
.fo_close = cryptof_close
};
static struct csession *csefind(struct fcrypt *, u_int);
static int csedelete(struct fcrypt *, struct csession *);
static struct csession *cseadd(struct fcrypt *, struct csession *);
static struct csession *csecreate(struct fcrypt *, u_int64_t, caddr_t,
u_int64_t, caddr_t, u_int64_t, u_int32_t, u_int32_t, struct enc_xform *,
struct auth_hash *);
static int csefree(struct csession *);
static int cryptodev_op(struct csession *, struct crypt_op *,
struct ucred *, struct thread *td);
static int cryptodev_key(struct crypt_kop *);
static int cryptodev_find(struct crypt_find_op *);
static int
cryptof_rw(
struct file *fp,
struct uio *uio,
struct ucred *active_cred,
int flags,
struct thread *td)
{
return (EIO);
}
/*
* Check a crypto identifier to see if it requested
* a software device/driver. This can be done either
* by device name/class or through search constraints.
*/
static int
checkforsoftware(int crid)
{
if (crid & CRYPTOCAP_F_SOFTWARE)
return EINVAL; /* XXX */
if ((crid & CRYPTOCAP_F_HARDWARE) == 0 &&
(crypto_getcaps(crid) & CRYPTOCAP_F_HARDWARE) == 0)
return EINVAL; /* XXX */
return 0;
}
/* ARGSUSED */
static int
cryptof_ioctl(
struct file *fp,
u_long cmd,
void *data,
struct ucred *active_cred,
struct thread *td)
{
#define SES2(p) ((struct session2_op *)p)
struct cryptoini cria, crie;
struct fcrypt *fcr = fp->f_data;
struct csession *cse;
struct session_op *sop;
struct crypt_op *cop;
struct enc_xform *txform = NULL;
struct auth_hash *thash = NULL;
struct crypt_kop *kop;
u_int64_t sid;
u_int32_t ses;
int error = 0, crid;
switch (cmd) {
case CIOCGSESSION:
case CIOCGSESSION2:
sop = (struct session_op *)data;
switch (sop->cipher) {
case 0:
break;
case CRYPTO_DES_CBC:
txform = &enc_xform_des;
break;
case CRYPTO_3DES_CBC:
txform = &enc_xform_3des;
break;
case CRYPTO_BLF_CBC:
txform = &enc_xform_blf;
break;
case CRYPTO_CAST_CBC:
txform = &enc_xform_cast5;
break;
case CRYPTO_SKIPJACK_CBC:
txform = &enc_xform_skipjack;
break;
case CRYPTO_AES_CBC:
txform = &enc_xform_rijndael128;
break;
case CRYPTO_NULL_CBC:
txform = &enc_xform_null;
break;
case CRYPTO_ARC4:
txform = &enc_xform_arc4;
break;
default:
return (EINVAL);
}
switch (sop->mac) {
case 0:
break;
case CRYPTO_MD5_HMAC:
thash = &auth_hash_hmac_md5;
break;
case CRYPTO_SHA1_HMAC:
thash = &auth_hash_hmac_sha1;
break;
case CRYPTO_SHA2_256_HMAC:
thash = &auth_hash_hmac_sha2_256;
break;
case CRYPTO_SHA2_384_HMAC:
thash = &auth_hash_hmac_sha2_384;
break;
case CRYPTO_SHA2_512_HMAC:
thash = &auth_hash_hmac_sha2_512;
break;
case CRYPTO_RIPEMD160_HMAC:
thash = &auth_hash_hmac_ripemd_160;
break;
#ifdef notdef
case CRYPTO_MD5:
thash = &auth_hash_md5;
break;
case CRYPTO_SHA1:
thash = &auth_hash_sha1;
break;
#endif
case CRYPTO_NULL_HMAC:
thash = &auth_hash_null;
break;
default:
return (EINVAL);
}
bzero(&crie, sizeof(crie));
bzero(&cria, sizeof(cria));
if (txform) {
crie.cri_alg = txform->type;
crie.cri_klen = sop->keylen * 8;
if (sop->keylen > txform->maxkey ||
sop->keylen < txform->minkey) {
error = EINVAL;
goto bail;
}
MALLOC(crie.cri_key, u_int8_t *,
crie.cri_klen / 8, M_XDATA, M_WAITOK);
if ((error = copyin(sop->key, crie.cri_key,
crie.cri_klen / 8)))
goto bail;
if (thash)
crie.cri_next = &cria;
}
if (thash) {
cria.cri_alg = thash->type;
cria.cri_klen = sop->mackeylen * 8;
if (sop->mackeylen != thash->keysize) {
error = EINVAL;
goto bail;
}
if (cria.cri_klen) {
MALLOC(cria.cri_key, u_int8_t *,
cria.cri_klen / 8, M_XDATA, M_WAITOK);
if ((error = copyin(sop->mackey, cria.cri_key,
cria.cri_klen / 8)))
goto bail;
}
}
/* NB: CIOGSESSION2 has the crid */
if (cmd == CIOCGSESSION2) {
crid = SES2(sop)->crid;
error = checkforsoftware(crid);
if (error)
goto bail;
} else
crid = CRYPTOCAP_F_HARDWARE;
error = crypto_newsession(&sid, (txform ? &crie : &cria), crid);
if (error)
goto bail;
cse = csecreate(fcr, sid, crie.cri_key, crie.cri_klen,
cria.cri_key, cria.cri_klen, sop->cipher, sop->mac, txform,
thash);
if (cse == NULL) {
crypto_freesession(sid);
error = EINVAL;
goto bail;
}
sop->ses = cse->ses;
if (cmd == CIOCGSESSION2) {
/* return hardware/driver id */
SES2(sop)->crid = CRYPTO_SESID2HID(cse->sid);
}
bail:
if (error) {
if (crie.cri_key)
FREE(crie.cri_key, M_XDATA);
if (cria.cri_key)
FREE(cria.cri_key, M_XDATA);
}
break;
case CIOCFSESSION:
ses = *(u_int32_t *)data;
cse = csefind(fcr, ses);
if (cse == NULL)
return (EINVAL);
csedelete(fcr, cse);
error = csefree(cse);
break;
case CIOCCRYPT:
cop = (struct crypt_op *)data;
cse = csefind(fcr, cop->ses);
if (cse == NULL)
return (EINVAL);
error = cryptodev_op(cse, cop, active_cred, td);
break;
case CIOCKEY:
case CIOCKEY2:
if (!crypto_userasymcrypto)
return (EPERM); /* XXX compat? */
mtx_lock(&Giant);
kop = (struct crypt_kop *)data;
if (cmd == CIOCKEY) {
/* NB: crypto core enforces s/w driver use */
kop->crk_crid =
CRYPTOCAP_F_HARDWARE | CRYPTOCAP_F_SOFTWARE;
}
error = cryptodev_key(kop);
mtx_unlock(&Giant);
break;
case CIOCASYMFEAT:
if (!crypto_userasymcrypto) {
/*
* NB: if user asym crypto operations are
* not permitted return "no algorithms"
* so well-behaved applications will just
* fallback to doing them in software.
*/
*(int *)data = 0;
} else
error = crypto_getfeat((int *)data);
break;
case CIOCFINDDEV:
error = cryptodev_find((struct crypt_find_op *)data);
break;
default:
error = EINVAL;
break;
}
return (error);
#undef SES2
}
static int cryptodev_cb(void *);
static int
cryptodev_op(
struct csession *cse,
struct crypt_op *cop,
struct ucred *active_cred,
struct thread *td)
{
struct cryptop *crp = NULL;
struct cryptodesc *crde = NULL, *crda = NULL;
int error;
if (cop->len > 256*1024-4)
return (E2BIG);
if (cse->txform) {
if (cop->len == 0 || (cop->len % cse->txform->blocksize) != 0)
return (EINVAL);
}
cse->uio.uio_iov = &cse->iovec;
cse->uio.uio_iovcnt = 1;
cse->uio.uio_offset = 0;
cse->uio.uio_resid = cop->len;
cse->uio.uio_segflg = UIO_SYSSPACE;
cse->uio.uio_rw = UIO_WRITE;
cse->uio.uio_td = td;
cse->uio.uio_iov[0].iov_len = cop->len;
if (cse->thash)
cse->uio.uio_iov[0].iov_len += cse->thash->hashsize;
cse->uio.uio_iov[0].iov_base = malloc(cse->uio.uio_iov[0].iov_len,
M_XDATA, M_WAITOK);
crp = crypto_getreq((cse->txform != NULL) + (cse->thash != NULL));
if (crp == NULL) {
error = ENOMEM;
goto bail;
}
if (cse->thash) {
crda = crp->crp_desc;
if (cse->txform)
crde = crda->crd_next;
} else {
if (cse->txform)
crde = crp->crp_desc;
else {
error = EINVAL;
goto bail;
}
}
if ((error = copyin(cop->src, cse->uio.uio_iov[0].iov_base, cop->len)))
goto bail;
if (crda) {
crda->crd_skip = 0;
crda->crd_len = cop->len;
crda->crd_inject = cop->len;
crda->crd_alg = cse->mac;
crda->crd_key = cse->mackey;
crda->crd_klen = cse->mackeylen * 8;
}
if (crde) {
if (cop->op == COP_ENCRYPT)
crde->crd_flags |= CRD_F_ENCRYPT;
else
crde->crd_flags &= ~CRD_F_ENCRYPT;
crde->crd_len = cop->len;
crde->crd_inject = 0;
crde->crd_alg = cse->cipher;
crde->crd_key = cse->key;
crde->crd_klen = cse->keylen * 8;
}
crp->crp_ilen = cop->len;
crp->crp_flags = CRYPTO_F_IOV | CRYPTO_F_CBIMM
| (cop->flags & COP_F_BATCH);
crp->crp_buf = (caddr_t)&cse->uio;
crp->crp_callback = (int (*) (struct cryptop *)) cryptodev_cb;
crp->crp_sid = cse->sid;
crp->crp_opaque = (void *)cse;
if (cop->iv) {
if (crde == NULL) {
error = EINVAL;
goto bail;
}
if (cse->cipher == CRYPTO_ARC4) { /* XXX use flag? */
error = EINVAL;
goto bail;
}
if ((error = copyin(cop->iv, cse->tmp_iv, cse->txform->blocksize)))
goto bail;
bcopy(cse->tmp_iv, crde->crd_iv, cse->txform->blocksize);
crde->crd_flags |= CRD_F_IV_EXPLICIT | CRD_F_IV_PRESENT;
crde->crd_skip = 0;
} else if (cse->cipher == CRYPTO_ARC4) { /* XXX use flag? */
crde->crd_skip = 0;
} else if (crde) {
crde->crd_flags |= CRD_F_IV_PRESENT;
crde->crd_skip = cse->txform->blocksize;
crde->crd_len -= cse->txform->blocksize;
}
if (cop->mac && crda == NULL) {
error = EINVAL;
goto bail;
}
/*
* Let the dispatch run unlocked, then, interlock against the
* callback before checking if the operation completed and going
* to sleep. This insures drivers don't inherit our lock which
* results in a lock order reversal between crypto_dispatch forced
* entry and the crypto_done callback into us.
*/
error = crypto_dispatch(crp);
mtx_lock(&cse->lock);
if (error == 0 && (crp->crp_flags & CRYPTO_F_DONE) == 0)
error = msleep(crp, &cse->lock, PWAIT, "crydev", 0);
mtx_unlock(&cse->lock);
if (error != 0)
goto bail;
if (crp->crp_etype != 0) {
error = crp->crp_etype;
goto bail;
}
if (cse->error) {
error = cse->error;
goto bail;
}
if (cop->dst &&
(error = copyout(cse->uio.uio_iov[0].iov_base, cop->dst, cop->len)))
goto bail;
if (cop->mac &&
(error = copyout((caddr_t)cse->uio.uio_iov[0].iov_base + cop->len,
cop->mac, cse->thash->hashsize)))
goto bail;
bail:
if (crp)
crypto_freereq(crp);
if (cse->uio.uio_iov[0].iov_base)
free(cse->uio.uio_iov[0].iov_base, M_XDATA);
return (error);
}
static int
cryptodev_cb(void *op)
{
struct cryptop *crp = (struct cryptop *) op;
struct csession *cse = (struct csession *)crp->crp_opaque;
int error;
error = crp->crp_etype;
if (error == EAGAIN)
error = crypto_dispatch(crp);
mtx_lock(&cse->lock);
if (error != 0 || (crp->crp_flags & CRYPTO_F_DONE)) {
cse->error = error;
wakeup_one(crp);
}
mtx_unlock(&cse->lock);
return (0);
}
static int
cryptodevkey_cb(void *op)
{
struct cryptkop *krp = (struct cryptkop *) op;
wakeup_one(krp);
return (0);
}
static int
cryptodev_key(struct crypt_kop *kop)
{
struct cryptkop *krp = NULL;
int error = EINVAL;
int in, out, size, i;
if (kop->crk_iparams + kop->crk_oparams > CRK_MAXPARAM) {
return (EFBIG);
}
in = kop->crk_iparams;
out = kop->crk_oparams;
switch (kop->crk_op) {
case CRK_MOD_EXP:
if (in == 3 && out == 1)
break;
return (EINVAL);
case CRK_MOD_EXP_CRT:
if (in == 6 && out == 1)
break;
return (EINVAL);
case CRK_DSA_SIGN:
if (in == 5 && out == 2)
break;
return (EINVAL);
case CRK_DSA_VERIFY:
if (in == 7 && out == 0)
break;
return (EINVAL);
case CRK_DH_COMPUTE_KEY:
if (in == 3 && out == 1)
break;
return (EINVAL);
default:
return (EINVAL);
}
krp = (struct cryptkop *)malloc(sizeof *krp, M_XDATA, M_WAITOK);
if (!krp)
return (ENOMEM);
bzero(krp, sizeof *krp);
krp->krp_op = kop->crk_op;
krp->krp_status = kop->crk_status;
krp->krp_iparams = kop->crk_iparams;
krp->krp_oparams = kop->crk_oparams;
krp->krp_crid = kop->crk_crid;
krp->krp_status = 0;
krp->krp_callback = (int (*) (struct cryptkop *)) cryptodevkey_cb;
for (i = 0; i < CRK_MAXPARAM; i++)
krp->krp_param[i].crp_nbits = kop->crk_param[i].crp_nbits;
for (i = 0; i < krp->krp_iparams + krp->krp_oparams; i++) {
size = (krp->krp_param[i].crp_nbits + 7) / 8;
if (size == 0)
continue;
MALLOC(krp->krp_param[i].crp_p, caddr_t, size, M_XDATA, M_WAITOK);
if (i >= krp->krp_iparams)
continue;
error = copyin(kop->crk_param[i].crp_p, krp->krp_param[i].crp_p, size);
if (error)
goto fail;
}
error = crypto_kdispatch(krp);
if (error)
goto fail;
error = tsleep(krp, PSOCK, "crydev", 0);
if (error) {
/* XXX can this happen? if so, how do we recover? */
goto fail;
}
kop->crk_crid = krp->krp_crid; /* device that did the work */
if (krp->krp_status != 0) {
error = krp->krp_status;
goto fail;
}
for (i = krp->krp_iparams; i < krp->krp_iparams + krp->krp_oparams; i++) {
size = (krp->krp_param[i].crp_nbits + 7) / 8;
if (size == 0)
continue;
error = copyout(krp->krp_param[i].crp_p, kop->crk_param[i].crp_p, size);
if (error)
goto fail;
}
fail:
if (krp) {
kop->crk_status = krp->krp_status;
for (i = 0; i < CRK_MAXPARAM; i++) {
if (krp->krp_param[i].crp_p)
FREE(krp->krp_param[i].crp_p, M_XDATA);
}
free(krp, M_XDATA);
}
return (error);
}
static int
cryptodev_find(struct crypt_find_op *find)
{
device_t dev;
if (find->crid != -1) {
dev = crypto_find_device_byhid(find->crid);
if (dev == NULL)
return (ENOENT);
strlcpy(find->name, device_get_nameunit(dev),
sizeof(find->name));
} else {
find->crid = crypto_find_driver(find->name);
if (find->crid == -1)
return (ENOENT);
}
return (0);
}
/* ARGSUSED */
static int
cryptof_poll(
struct file *fp,
int events,
struct ucred *active_cred,
struct thread *td)
{
return (0);
}
/* ARGSUSED */
static int
cryptof_kqfilter(struct file *fp, struct knote *kn)
{
return (0);
}
/* ARGSUSED */
static int
cryptof_stat(
struct file *fp,
struct stat *sb,
struct ucred *active_cred,
struct thread *td)
{
return (EOPNOTSUPP);
}
/* ARGSUSED */
static int
cryptof_close(struct file *fp, struct thread *td)
{
struct fcrypt *fcr = fp->f_data;
struct csession *cse;
while ((cse = TAILQ_FIRST(&fcr->csessions))) {
TAILQ_REMOVE(&fcr->csessions, cse, next);
(void)csefree(cse);
}
FREE(fcr, M_XDATA);
fp->f_data = NULL;
return 0;
}
static struct csession *
csefind(struct fcrypt *fcr, u_int ses)
{
struct csession *cse;
TAILQ_FOREACH(cse, &fcr->csessions, next)
if (cse->ses == ses)
return (cse);
return (NULL);
}
static int
csedelete(struct fcrypt *fcr, struct csession *cse_del)
{
struct csession *cse;
TAILQ_FOREACH(cse, &fcr->csessions, next) {
if (cse == cse_del) {
TAILQ_REMOVE(&fcr->csessions, cse, next);
return (1);
}
}
return (0);
}
static struct csession *
cseadd(struct fcrypt *fcr, struct csession *cse)
{
TAILQ_INSERT_TAIL(&fcr->csessions, cse, next);
cse->ses = fcr->sesn++;
return (cse);
}
struct csession *
csecreate(struct fcrypt *fcr, u_int64_t sid, caddr_t key, u_int64_t keylen,
caddr_t mackey, u_int64_t mackeylen, u_int32_t cipher, u_int32_t mac,
struct enc_xform *txform, struct auth_hash *thash)
{
struct csession *cse;
#ifdef INVARIANTS
/* NB: required when mtx_init is built with INVARIANTS */
MALLOC(cse, struct csession *, sizeof(struct csession),
M_XDATA, M_NOWAIT | M_ZERO);
#else
MALLOC(cse, struct csession *, sizeof(struct csession),
M_XDATA, M_NOWAIT);
#endif
if (cse == NULL)
return NULL;
mtx_init(&cse->lock, "cryptodev", "crypto session lock", MTX_DEF);
cse->key = key;
cse->keylen = keylen/8;
cse->mackey = mackey;
cse->mackeylen = mackeylen/8;
cse->sid = sid;
cse->cipher = cipher;
cse->mac = mac;
cse->txform = txform;
cse->thash = thash;
cseadd(fcr, cse);
return (cse);
}
static int
csefree(struct csession *cse)
{
int error;
error = crypto_freesession(cse->sid);
mtx_destroy(&cse->lock);
if (cse->key)
FREE(cse->key, M_XDATA);
if (cse->mackey)
FREE(cse->mackey, M_XDATA);
FREE(cse, M_XDATA);
return (error);
}
static int
cryptoopen(struct cdev *dev, int oflags, int devtype, struct thread *td)
{
return (0);
}
static int
cryptoread(struct cdev *dev, struct uio *uio, int ioflag)
{
return (EIO);
}
static int
cryptowrite(struct cdev *dev, struct uio *uio, int ioflag)
{
return (EIO);
}
static int
cryptoioctl(struct cdev *dev, u_long cmd, caddr_t data, int flag, struct thread *td)
{
struct file *f;
struct fcrypt *fcr;
int fd, error;
switch (cmd) {
case CRIOGET:
MALLOC(fcr, struct fcrypt *,
sizeof(struct fcrypt), M_XDATA, M_WAITOK);
TAILQ_INIT(&fcr->csessions);
fcr->sesn = 0;
error = falloc(td, &f, &fd);
if (error) {
FREE(fcr, M_XDATA);
return (error);
}
/* falloc automatically provides an extra reference to 'f'. */
FILE_LOCK(f);
f->f_flag = FREAD | FWRITE;
f->f_type = DTYPE_CRYPTO;
f->f_data = fcr;
f->f_ops = &cryptofops;
FILE_UNLOCK(f);
*(u_int32_t *)data = fd;
fdrop(f, td);
break;
case CRIOFINDDEV:
error = cryptodev_find((struct crypt_find_op *)data);
break;
case CRIOASYMFEAT:
error = crypto_getfeat((int *)data);
break;
default:
error = EINVAL;
break;
}
return (error);
}
static struct cdevsw crypto_cdevsw = {
.d_version = D_VERSION,
.d_flags = D_NEEDGIANT,
.d_open = cryptoopen,
.d_read = cryptoread,
.d_write = cryptowrite,
.d_ioctl = cryptoioctl,
.d_name = "crypto",
};
static struct cdev *crypto_dev;
/*
* Initialization code, both for static and dynamic loading.
*/
static int
cryptodev_modevent(module_t mod, int type, void *unused)
{
switch (type) {
case MOD_LOAD:
if (bootverbose)
printf("crypto: <crypto device>\n");
crypto_dev = make_dev(&crypto_cdevsw, 0,
UID_ROOT, GID_WHEEL, 0666,
"crypto");
return 0;
case MOD_UNLOAD:
/*XXX disallow if active sessions */
destroy_dev(crypto_dev);
return 0;
}
return EINVAL;
}
static moduledata_t cryptodev_mod = {
"cryptodev",
cryptodev_modevent,
0
};
MODULE_VERSION(cryptodev, 1);
DECLARE_MODULE(cryptodev, cryptodev_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
MODULE_DEPEND(cryptodev, crypto, 1, 1, 1);
MODULE_DEPEND(cryptodev, zlib, 1, 1, 1);
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