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freebsd-skq/sys/crypto/via/padlock.c
sam f96ba7ffda Overhaul driver/subsystem api's: 
o make all crypto drivers have a device_t; pseudo drivers like the s/w
  crypto driver synthesize one
o change the api between the crypto subsystem and drivers to use kobj;
  cryptodev_if.m defines this api
o use the fact that all crypto drivers now have a device_t to add support
  for specifying which of several potential devices to use when doing
  crypto operations
o add new ioctls that allow user apps to select a specific crypto device
  to use (previous ioctls maintained for compatibility)
o overhaul crypto subsystem code to eliminate lots of cruft and hide
  implementation details from drivers
o bring in numerous fixes from Michale Richardson/hifn; mostly for
  795x parts
o add an optional mechanism for mmap'ing the hifn 795x public key h/w
  to user space for use by openssl (not enabled by default)
o update crypto test tools to use new ioctl's and add cmd line options
  to specify a device to use for tests

These changes will also enable much future work on improving the core
crypto subsystem; including proper load balancing and interposing code
between the core and drivers to dispatch small operations to the s/w
driver as appropriate.

These changes were instigated by the work of Michael Richardson.

Reviewed by:	pjd
Approved by:	re
2007-03-21 03:42:51 +00:00

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/*-
* Copyright (c) 2005-2006 Pawel Jakub Dawidek <pjd@FreeBSD.org>
* All rights reserved.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``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 AUTHORS OR CONTRIBUTORS 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.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/malloc.h>
#include <sys/libkern.h>
#if defined(__i386__) && !defined(PC98)
#include <machine/cpufunc.h>
#include <machine/cputypes.h>
#include <machine/md_var.h>
#include <machine/specialreg.h>
#endif
#include <opencrypto/cryptodev.h>
#include <crypto/via/padlock.h>
#include <sys/kobj.h>
#include <sys/bus.h>
#include "cryptodev_if.h"
/*
* Technical documentation about the PadLock engine can be found here:
*
* http://www.via.com.tw/en/downloads/whitepapers/initiatives/padlock/programming_guide.pdf
*/
struct padlock_softc {
int32_t sc_cid;
uint32_t sc_sid;
TAILQ_HEAD(, padlock_session) sc_sessions;
struct mtx sc_sessions_mtx;
};
static int padlock_newsession(device_t, uint32_t *sidp, struct cryptoini *cri);
static int padlock_freesession(device_t, uint64_t tid);
static int padlock_process(device_t, struct cryptop *crp, int hint __unused);
MALLOC_DEFINE(M_PADLOCK, "padlock_data", "PadLock Data");
static void
padlock_identify(device_t *dev, device_t parent)
{
/* NB: order 10 is so we get attached after h/w devices */
if (device_find_child(parent, "padlock", -1) == NULL &&
BUS_ADD_CHILD(parent, 10, "padlock", -1) == 0)
panic("padlock: could not attach");
}
static int
padlock_probe(device_t dev)
{
char capp[256];
#if defined(__i386__) && !defined(PC98)
/* If there is no AES support, we has nothing to do here. */
if (!(via_feature_xcrypt & VIA_HAS_AES)) {
device_printf(dev, "No ACE support.\n");
return (EINVAL);
}
strlcpy(capp, "AES-CBC", sizeof(capp));
#if 0
strlcat(capp, ",AES-EBC", sizeof(capp));
strlcat(capp, ",AES-CFB", sizeof(capp));
strlcat(capp, ",AES-OFB", sizeof(capp));
#endif
if (via_feature_xcrypt & VIA_HAS_SHA) {
strlcat(capp, ",SHA1", sizeof(capp));
strlcat(capp, ",SHA256", sizeof(capp));
}
#if 0
if (via_feature_xcrypt & VIA_HAS_AESCTR)
strlcat(capp, ",AES-CTR", sizeof(capp));
if (via_feature_xcrypt & VIA_HAS_MM)
strlcat(capp, ",RSA", sizeof(capp));
#endif
device_set_desc_copy(dev, capp);
return (0);
#else
return (EINVAL);
#endif
}
static int
padlock_attach(device_t dev)
{
struct padlock_softc *sc = device_get_softc(dev);
TAILQ_INIT(&sc->sc_sessions);
sc->sc_sid = 1;
sc->sc_cid = crypto_get_driverid(dev, CRYPTOCAP_F_HARDWARE);
if (sc->sc_cid < 0) {
device_printf(dev, "Could not get crypto driver id.\n");
return (ENOMEM);
}
mtx_init(&sc->sc_sessions_mtx, "padlock_mtx", NULL, MTX_DEF);
crypto_register(sc->sc_cid, CRYPTO_AES_CBC, 0, 0);
crypto_register(sc->sc_cid, CRYPTO_MD5_HMAC, 0, 0);
crypto_register(sc->sc_cid, CRYPTO_SHA1_HMAC, 0, 0);
crypto_register(sc->sc_cid, CRYPTO_RIPEMD160_HMAC, 0, 0);
crypto_register(sc->sc_cid, CRYPTO_SHA2_256_HMAC, 0, 0);
crypto_register(sc->sc_cid, CRYPTO_SHA2_384_HMAC, 0, 0);
crypto_register(sc->sc_cid, CRYPTO_SHA2_512_HMAC, 0, 0);
return (0);
}
static int
padlock_detach(device_t dev)
{
struct padlock_softc *sc = device_get_softc(dev);
struct padlock_session *ses;
mtx_lock(&sc->sc_sessions_mtx);
TAILQ_FOREACH(ses, &sc->sc_sessions, ses_next) {
if (ses->ses_used) {
mtx_unlock(&sc->sc_sessions_mtx);
device_printf(dev,
"Cannot detach, sessions still active.\n");
return (EBUSY);
}
}
for (ses = TAILQ_FIRST(&sc->sc_sessions); ses != NULL;
ses = TAILQ_FIRST(&sc->sc_sessions)) {
TAILQ_REMOVE(&sc->sc_sessions, ses, ses_next);
free(ses, M_PADLOCK);
}
mtx_destroy(&sc->sc_sessions_mtx);
crypto_unregister_all(sc->sc_cid);
return (0);
}
static int
padlock_newsession(device_t dev, uint32_t *sidp, struct cryptoini *cri)
{
struct padlock_softc *sc = device_get_softc(dev);
struct padlock_session *ses = NULL;
struct cryptoini *encini, *macini;
int error;
if (sidp == NULL || cri == NULL)
return (EINVAL);
encini = macini = NULL;
for (; cri != NULL; cri = cri->cri_next) {
switch (cri->cri_alg) {
case CRYPTO_NULL_HMAC:
case CRYPTO_MD5_HMAC:
case CRYPTO_SHA1_HMAC:
case CRYPTO_RIPEMD160_HMAC:
case CRYPTO_SHA2_256_HMAC:
case CRYPTO_SHA2_384_HMAC:
case CRYPTO_SHA2_512_HMAC:
if (macini != NULL)
return (EINVAL);
macini = cri;
break;
case CRYPTO_AES_CBC:
if (encini != NULL)
return (EINVAL);
encini = cri;
break;
default:
return (EINVAL);
}
}
/*
* We only support HMAC algorithms to be able to work with
* fast_ipsec(4), so if we are asked only for authentication without
* encryption, don't pretend we can accellerate it.
*/
if (encini == NULL)
return (EINVAL);
/*
* Let's look for a free session structure.
*/
mtx_lock(&sc->sc_sessions_mtx);
/*
* Free sessions goes first, so if first session is used, we need to
* allocate one.
*/
ses = TAILQ_FIRST(&sc->sc_sessions);
if (ses == NULL || ses->ses_used)
ses = NULL;
else {
TAILQ_REMOVE(&sc->sc_sessions, ses, ses_next);
ses->ses_used = 1;
TAILQ_INSERT_TAIL(&sc->sc_sessions, ses, ses_next);
}
mtx_unlock(&sc->sc_sessions_mtx);
if (ses == NULL) {
ses = malloc(sizeof(*ses), M_PADLOCK, M_NOWAIT | M_ZERO);
if (ses == NULL)
return (ENOMEM);
ses->ses_used = 1;
mtx_lock(&sc->sc_sessions_mtx);
ses->ses_id = sc->sc_sid++;
TAILQ_INSERT_TAIL(&sc->sc_sessions, ses, ses_next);
mtx_unlock(&sc->sc_sessions_mtx);
}
error = padlock_cipher_setup(ses, encini);
if (error != 0) {
padlock_freesession(NULL, ses->ses_id);
return (error);
}
if (macini != NULL) {
error = padlock_hash_setup(ses, macini);
if (error != 0) {
padlock_freesession(NULL, ses->ses_id);
return (error);
}
}
*sidp = ses->ses_id;
return (0);
}
static int
padlock_freesession(device_t dev, uint64_t tid)
{
struct padlock_softc *sc = device_get_softc(dev);
struct padlock_session *ses;
uint32_t sid = ((uint32_t)tid) & 0xffffffff;
mtx_lock(&sc->sc_sessions_mtx);
TAILQ_FOREACH(ses, &sc->sc_sessions, ses_next) {
if (ses->ses_id == sid)
break;
}
if (ses == NULL) {
mtx_unlock(&sc->sc_sessions_mtx);
return (EINVAL);
}
TAILQ_REMOVE(&sc->sc_sessions, ses, ses_next);
padlock_hash_free(ses);
bzero(ses, sizeof(*ses));
ses->ses_used = 0;
TAILQ_INSERT_TAIL(&sc->sc_sessions, ses, ses_next);
mtx_unlock(&sc->sc_sessions_mtx);
return (0);
}
static int
padlock_process(device_t dev, struct cryptop *crp, int hint __unused)
{
struct padlock_softc *sc = device_get_softc(dev);
struct padlock_session *ses = NULL;
struct cryptodesc *crd, *enccrd, *maccrd;
int error = 0;
enccrd = maccrd = NULL;
if (crp == NULL || crp->crp_callback == NULL || crp->crp_desc == NULL) {
error = EINVAL;
goto out;
}
for (crd = crp->crp_desc; crd != NULL; crd = crd->crd_next) {
switch (crd->crd_alg) {
case CRYPTO_NULL_HMAC:
case CRYPTO_MD5_HMAC:
case CRYPTO_SHA1_HMAC:
case CRYPTO_RIPEMD160_HMAC:
case CRYPTO_SHA2_256_HMAC:
case CRYPTO_SHA2_384_HMAC:
case CRYPTO_SHA2_512_HMAC:
if (maccrd != NULL) {
error = EINVAL;
goto out;
}
maccrd = crd;
break;
case CRYPTO_AES_CBC:
if (enccrd != NULL) {
error = EINVAL;
goto out;
}
enccrd = crd;
break;
default:
return (EINVAL);
}
}
if (enccrd == NULL || (enccrd->crd_len % AES_BLOCK_LEN) != 0) {
error = EINVAL;
goto out;
}
mtx_lock(&sc->sc_sessions_mtx);
TAILQ_FOREACH(ses, &sc->sc_sessions, ses_next) {
if (ses->ses_id == (crp->crp_sid & 0xffffffff))
break;
}
mtx_unlock(&sc->sc_sessions_mtx);
if (ses == NULL) {
error = EINVAL;
goto out;
}
/* Perform data authentication if requested before encryption. */
if (maccrd != NULL && maccrd->crd_next == enccrd) {
error = padlock_hash_process(ses, maccrd, crp);
if (error != 0)
goto out;
}
error = padlock_cipher_process(ses, enccrd, crp);
if (error != 0)
goto out;
/* Perform data authentication if requested after encryption. */
if (maccrd != NULL && enccrd->crd_next == maccrd) {
error = padlock_hash_process(ses, maccrd, crp);
if (error != 0)
goto out;
}
out:
#if 0
/*
* This code is not necessary, because contexts will be freed on next
* padlock_setup_mackey() call or at padlock_freesession() call.
*/
if (ses != NULL && maccrd != NULL &&
(maccrd->crd_flags & CRD_F_KEY_EXPLICIT) != 0) {
padlock_free_ctx(ses->ses_axf, ses->ses_ictx);
padlock_free_ctx(ses->ses_axf, ses->ses_octx);
}
#endif
crp->crp_etype = error;
crypto_done(crp);
return (error);
}
static device_method_t padlock_methods[] = {
DEVMETHOD(device_identify, padlock_identify),
DEVMETHOD(device_probe, padlock_probe),
DEVMETHOD(device_attach, padlock_attach),
DEVMETHOD(device_detach, padlock_detach),
DEVMETHOD(cryptodev_newsession, padlock_newsession),
DEVMETHOD(cryptodev_freesession,padlock_freesession),
DEVMETHOD(cryptodev_process, padlock_process),
{0, 0},
};
static driver_t padlock_driver = {
"padlock",
padlock_methods,
sizeof(struct padlock_softc),
};
static devclass_t padlock_devclass;
/* XXX where to attach */
DRIVER_MODULE(padlock, nexus, padlock_driver, padlock_devclass, 0, 0);
MODULE_VERSION(padlock, 1);
MODULE_DEPEND(padlock, crypto, 1, 1, 1);
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