411 lines
11 KiB
C
411 lines
11 KiB
C
/*-
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* Copyright (c) 2005-2008 Pawel Jakub Dawidek <pjd@FreeBSD.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/module.h>
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#include <sys/lock.h>
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#include <sys/rwlock.h>
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#include <sys/malloc.h>
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#include <sys/libkern.h>
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#if defined(__amd64__) || (defined(__i386__) && !defined(PC98))
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#include <machine/cpufunc.h>
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#include <machine/cputypes.h>
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#include <machine/md_var.h>
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#include <machine/specialreg.h>
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#endif
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#include <opencrypto/cryptodev.h>
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#include <crypto/via/padlock.h>
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#include <sys/kobj.h>
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#include <sys/bus.h>
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#include "cryptodev_if.h"
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/*
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* Technical documentation about the PadLock engine can be found here:
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*
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* http://www.via.com.tw/en/downloads/whitepapers/initiatives/padlock/programming_guide.pdf
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*/
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struct padlock_softc {
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int32_t sc_cid;
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uint32_t sc_sid;
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TAILQ_HEAD(padlock_sessions_head, padlock_session) sc_sessions;
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struct rwlock sc_sessions_lock;
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};
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static int padlock_newsession(device_t, uint32_t *sidp, struct cryptoini *cri);
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static int padlock_freesession(device_t, uint64_t tid);
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static void padlock_freesession_one(struct padlock_softc *sc,
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struct padlock_session *ses, int locked);
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static int padlock_process(device_t, struct cryptop *crp, int hint __unused);
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MALLOC_DEFINE(M_PADLOCK, "padlock_data", "PadLock Data");
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static void
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padlock_identify(driver_t *drv, device_t parent)
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{
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/* NB: order 10 is so we get attached after h/w devices */
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if (device_find_child(parent, "padlock", -1) == NULL &&
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BUS_ADD_CHILD(parent, 10, "padlock", -1) == 0)
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panic("padlock: could not attach");
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}
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static int
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padlock_probe(device_t dev)
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{
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char capp[256];
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#if defined(__amd64__) || (defined(__i386__) && !defined(PC98))
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/* If there is no AES support, we has nothing to do here. */
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if (!(via_feature_xcrypt & VIA_HAS_AES)) {
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device_printf(dev, "No ACE support.\n");
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return (EINVAL);
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}
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strlcpy(capp, "AES-CBC", sizeof(capp));
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#if 0
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strlcat(capp, ",AES-EBC", sizeof(capp));
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strlcat(capp, ",AES-CFB", sizeof(capp));
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strlcat(capp, ",AES-OFB", sizeof(capp));
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#endif
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if (via_feature_xcrypt & VIA_HAS_SHA) {
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strlcat(capp, ",SHA1", sizeof(capp));
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strlcat(capp, ",SHA256", sizeof(capp));
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}
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#if 0
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if (via_feature_xcrypt & VIA_HAS_AESCTR)
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strlcat(capp, ",AES-CTR", sizeof(capp));
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if (via_feature_xcrypt & VIA_HAS_MM)
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strlcat(capp, ",RSA", sizeof(capp));
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#endif
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device_set_desc_copy(dev, capp);
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return (0);
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#else
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return (EINVAL);
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#endif
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}
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static int
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padlock_attach(device_t dev)
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{
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struct padlock_softc *sc = device_get_softc(dev);
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TAILQ_INIT(&sc->sc_sessions);
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sc->sc_sid = 1;
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sc->sc_cid = crypto_get_driverid(dev, CRYPTOCAP_F_HARDWARE);
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if (sc->sc_cid < 0) {
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device_printf(dev, "Could not get crypto driver id.\n");
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return (ENOMEM);
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}
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rw_init(&sc->sc_sessions_lock, "padlock_lock");
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crypto_register(sc->sc_cid, CRYPTO_AES_CBC, 0, 0);
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crypto_register(sc->sc_cid, CRYPTO_MD5_HMAC, 0, 0);
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crypto_register(sc->sc_cid, CRYPTO_SHA1_HMAC, 0, 0);
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crypto_register(sc->sc_cid, CRYPTO_RIPEMD160_HMAC, 0, 0);
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crypto_register(sc->sc_cid, CRYPTO_SHA2_256_HMAC, 0, 0);
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crypto_register(sc->sc_cid, CRYPTO_SHA2_384_HMAC, 0, 0);
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crypto_register(sc->sc_cid, CRYPTO_SHA2_512_HMAC, 0, 0);
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return (0);
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}
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static int
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padlock_detach(device_t dev)
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{
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struct padlock_softc *sc = device_get_softc(dev);
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struct padlock_session *ses;
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rw_wlock(&sc->sc_sessions_lock);
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TAILQ_FOREACH(ses, &sc->sc_sessions, ses_next) {
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if (ses->ses_used) {
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rw_wunlock(&sc->sc_sessions_lock);
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device_printf(dev,
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"Cannot detach, sessions still active.\n");
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return (EBUSY);
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}
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}
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while ((ses = TAILQ_FIRST(&sc->sc_sessions)) != NULL) {
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TAILQ_REMOVE(&sc->sc_sessions, ses, ses_next);
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free(ses, M_PADLOCK);
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}
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rw_destroy(&sc->sc_sessions_lock);
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crypto_unregister_all(sc->sc_cid);
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return (0);
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}
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static int
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padlock_newsession(device_t dev, uint32_t *sidp, struct cryptoini *cri)
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{
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struct padlock_softc *sc = device_get_softc(dev);
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struct padlock_session *ses = NULL;
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struct cryptoini *encini, *macini;
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int error;
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if (sidp == NULL || cri == NULL)
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return (EINVAL);
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encini = macini = NULL;
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for (; cri != NULL; cri = cri->cri_next) {
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switch (cri->cri_alg) {
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case CRYPTO_NULL_HMAC:
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case CRYPTO_MD5_HMAC:
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case CRYPTO_SHA1_HMAC:
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case CRYPTO_RIPEMD160_HMAC:
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case CRYPTO_SHA2_256_HMAC:
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case CRYPTO_SHA2_384_HMAC:
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case CRYPTO_SHA2_512_HMAC:
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if (macini != NULL)
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return (EINVAL);
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macini = cri;
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break;
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case CRYPTO_AES_CBC:
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if (encini != NULL)
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return (EINVAL);
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encini = cri;
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break;
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default:
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return (EINVAL);
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}
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}
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/*
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* We only support HMAC algorithms to be able to work with
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* ipsec(4), so if we are asked only for authentication without
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* encryption, don't pretend we can accellerate it.
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*/
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if (encini == NULL)
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return (EINVAL);
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/*
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* Let's look for a free session structure.
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*/
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rw_wlock(&sc->sc_sessions_lock);
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/*
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* Free sessions goes first, so if first session is used, we need to
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* allocate one.
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*/
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ses = TAILQ_FIRST(&sc->sc_sessions);
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if (ses == NULL || ses->ses_used) {
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ses = malloc(sizeof(*ses), M_PADLOCK, M_NOWAIT | M_ZERO);
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if (ses == NULL) {
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rw_wunlock(&sc->sc_sessions_lock);
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return (ENOMEM);
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}
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ses->ses_id = sc->sc_sid++;
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} else {
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TAILQ_REMOVE(&sc->sc_sessions, ses, ses_next);
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}
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ses->ses_used = 1;
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TAILQ_INSERT_TAIL(&sc->sc_sessions, ses, ses_next);
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rw_wunlock(&sc->sc_sessions_lock);
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error = padlock_cipher_setup(ses, encini);
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if (error != 0) {
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padlock_freesession_one(sc, ses, 0);
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return (error);
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}
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if (macini != NULL) {
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error = padlock_hash_setup(ses, macini);
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if (error != 0) {
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padlock_freesession_one(sc, ses, 0);
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return (error);
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}
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}
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*sidp = ses->ses_id;
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return (0);
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}
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static void
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padlock_freesession_one(struct padlock_softc *sc, struct padlock_session *ses,
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int locked)
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{
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uint32_t sid = ses->ses_id;
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if (!locked)
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rw_wlock(&sc->sc_sessions_lock);
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TAILQ_REMOVE(&sc->sc_sessions, ses, ses_next);
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padlock_hash_free(ses);
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bzero(ses, sizeof(*ses));
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ses->ses_used = 0;
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ses->ses_id = sid;
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TAILQ_INSERT_HEAD(&sc->sc_sessions, ses, ses_next);
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if (!locked)
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rw_wunlock(&sc->sc_sessions_lock);
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}
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static int
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padlock_freesession(device_t dev, uint64_t tid)
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{
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struct padlock_softc *sc = device_get_softc(dev);
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struct padlock_session *ses;
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uint32_t sid = ((uint32_t)tid) & 0xffffffff;
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rw_wlock(&sc->sc_sessions_lock);
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TAILQ_FOREACH_REVERSE(ses, &sc->sc_sessions, padlock_sessions_head,
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ses_next) {
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if (ses->ses_id == sid)
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break;
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}
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if (ses == NULL) {
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rw_wunlock(&sc->sc_sessions_lock);
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return (EINVAL);
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}
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padlock_freesession_one(sc, ses, 1);
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rw_wunlock(&sc->sc_sessions_lock);
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return (0);
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}
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static int
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padlock_process(device_t dev, struct cryptop *crp, int hint __unused)
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{
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struct padlock_softc *sc = device_get_softc(dev);
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struct padlock_session *ses = NULL;
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struct cryptodesc *crd, *enccrd, *maccrd;
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int error = 0;
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enccrd = maccrd = NULL;
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/* Sanity check. */
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if (crp == NULL)
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return (EINVAL);
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if (crp->crp_callback == NULL || crp->crp_desc == NULL) {
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error = EINVAL;
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goto out;
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}
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for (crd = crp->crp_desc; crd != NULL; crd = crd->crd_next) {
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switch (crd->crd_alg) {
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case CRYPTO_NULL_HMAC:
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case CRYPTO_MD5_HMAC:
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case CRYPTO_SHA1_HMAC:
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case CRYPTO_RIPEMD160_HMAC:
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case CRYPTO_SHA2_256_HMAC:
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case CRYPTO_SHA2_384_HMAC:
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case CRYPTO_SHA2_512_HMAC:
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if (maccrd != NULL) {
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error = EINVAL;
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goto out;
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}
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maccrd = crd;
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break;
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case CRYPTO_AES_CBC:
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if (enccrd != NULL) {
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error = EINVAL;
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goto out;
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}
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enccrd = crd;
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break;
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default:
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return (EINVAL);
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}
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}
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if (enccrd == NULL || (enccrd->crd_len % AES_BLOCK_LEN) != 0) {
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error = EINVAL;
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goto out;
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}
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rw_rlock(&sc->sc_sessions_lock);
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TAILQ_FOREACH_REVERSE(ses, &sc->sc_sessions, padlock_sessions_head,
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ses_next) {
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if (ses->ses_id == (crp->crp_sid & 0xffffffff))
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break;
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}
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rw_runlock(&sc->sc_sessions_lock);
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if (ses == NULL) {
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error = EINVAL;
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goto out;
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}
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/* Perform data authentication if requested before encryption. */
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if (maccrd != NULL && maccrd->crd_next == enccrd) {
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error = padlock_hash_process(ses, maccrd, crp);
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if (error != 0)
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goto out;
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}
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error = padlock_cipher_process(ses, enccrd, crp);
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if (error != 0)
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goto out;
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/* Perform data authentication if requested after encryption. */
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if (maccrd != NULL && enccrd->crd_next == maccrd) {
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error = padlock_hash_process(ses, maccrd, crp);
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if (error != 0)
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goto out;
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}
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out:
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#if 0
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/*
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* This code is not necessary, because contexts will be freed on next
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* padlock_setup_mackey() call or at padlock_freesession() call.
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*/
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if (ses != NULL && maccrd != NULL &&
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(maccrd->crd_flags & CRD_F_KEY_EXPLICIT) != 0) {
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padlock_free_ctx(ses->ses_axf, ses->ses_ictx);
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padlock_free_ctx(ses->ses_axf, ses->ses_octx);
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}
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#endif
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crp->crp_etype = error;
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crypto_done(crp);
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return (error);
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}
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static device_method_t padlock_methods[] = {
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DEVMETHOD(device_identify, padlock_identify),
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DEVMETHOD(device_probe, padlock_probe),
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DEVMETHOD(device_attach, padlock_attach),
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DEVMETHOD(device_detach, padlock_detach),
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DEVMETHOD(cryptodev_newsession, padlock_newsession),
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DEVMETHOD(cryptodev_freesession,padlock_freesession),
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DEVMETHOD(cryptodev_process, padlock_process),
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{0, 0},
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};
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static driver_t padlock_driver = {
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"padlock",
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padlock_methods,
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sizeof(struct padlock_softc),
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};
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static devclass_t padlock_devclass;
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/* XXX where to attach */
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DRIVER_MODULE(padlock, nexus, padlock_driver, padlock_devclass, 0, 0);
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MODULE_VERSION(padlock, 1);
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MODULE_DEPEND(padlock, crypto, 1, 1, 1);
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