/*- * Copyright (c) 2005-2008 Pawel Jakub Dawidek * 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 #include #include #include #include #include #include #include #include #if defined(__amd64__) || defined(__i386__) #include #include #include #include #endif #include #include #include #include #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; }; static int padlock_probesession(device_t, const struct crypto_session_params *); static int padlock_newsession(device_t, crypto_session_t cses, const struct crypto_session_params *); static void padlock_freesession(device_t, crypto_session_t cses); static void padlock_freesession_one(struct padlock_softc *sc, struct padlock_session *ses); static int padlock_process(device_t, struct cryptop *crp, int hint __unused); MALLOC_DEFINE(M_PADLOCK, "padlock_data", "PadLock Data"); static void padlock_identify(driver_t *drv, 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(__amd64__) || defined(__i386__) /* 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); sc->sc_cid = crypto_get_driverid(dev, sizeof(struct padlock_session), CRYPTOCAP_F_SOFTWARE | CRYPTOCAP_F_SYNC | CRYPTOCAP_F_ACCEL_SOFTWARE); if (sc->sc_cid < 0) { device_printf(dev, "Could not get crypto driver id.\n"); return (ENOMEM); } return (0); } static int padlock_detach(device_t dev) { struct padlock_softc *sc = device_get_softc(dev); crypto_unregister_all(sc->sc_cid); return (0); } static int padlock_probesession(device_t dev, const struct crypto_session_params *csp) { if (csp->csp_flags != 0) return (EINVAL); /* * We only support HMAC algorithms to be able to work with * ipsec(4), so if we are asked only for authentication without * encryption, don't pretend we can accelerate it. * * XXX: For CPUs with SHA instructions we should probably * permit CSP_MODE_DIGEST so that those can be tested. */ switch (csp->csp_mode) { case CSP_MODE_ETA: if (!padlock_hash_check(csp)) return (EINVAL); /* FALLTHROUGH */ case CSP_MODE_CIPHER: switch (csp->csp_cipher_alg) { case CRYPTO_AES_CBC: if (csp->csp_ivlen != AES_BLOCK_LEN) return (EINVAL); break; default: return (EINVAL); } break; default: return (EINVAL); } return (CRYPTODEV_PROBE_ACCEL_SOFTWARE); } static int padlock_newsession(device_t dev, crypto_session_t cses, const struct crypto_session_params *csp) { struct padlock_softc *sc = device_get_softc(dev); struct padlock_session *ses = NULL; struct thread *td; int error; ses = crypto_get_driver_session(cses); ses->ses_fpu_ctx = fpu_kern_alloc_ctx(FPU_KERN_NORMAL); error = padlock_cipher_setup(ses, csp); if (error != 0) { padlock_freesession_one(sc, ses); return (error); } if (csp->csp_mode == CSP_MODE_ETA) { td = curthread; fpu_kern_enter(td, ses->ses_fpu_ctx, FPU_KERN_NORMAL | FPU_KERN_KTHR); error = padlock_hash_setup(ses, csp); fpu_kern_leave(td, ses->ses_fpu_ctx); if (error != 0) { padlock_freesession_one(sc, ses); return (error); } } return (0); } static void padlock_freesession_one(struct padlock_softc *sc, struct padlock_session *ses) { padlock_hash_free(ses); fpu_kern_free_ctx(ses->ses_fpu_ctx); } static void padlock_freesession(device_t dev, crypto_session_t cses) { struct padlock_softc *sc = device_get_softc(dev); struct padlock_session *ses; ses = crypto_get_driver_session(cses); padlock_freesession_one(sc, ses); } static int padlock_process(device_t dev, struct cryptop *crp, int hint __unused) { const struct crypto_session_params *csp; struct padlock_session *ses; int error; if ((crp->crp_payload_length % AES_BLOCK_LEN) != 0) { error = EINVAL; goto out; } ses = crypto_get_driver_session(crp->crp_session); csp = crypto_get_params(crp->crp_session); /* Perform data authentication if requested before decryption. */ if (csp->csp_mode == CSP_MODE_ETA && !CRYPTO_OP_IS_ENCRYPT(crp->crp_op)) { error = padlock_hash_process(ses, crp, csp); if (error != 0) goto out; } error = padlock_cipher_process(ses, crp, csp); if (error != 0) goto out; /* Perform data authentication if requested after encryption. */ if (csp->csp_mode == CSP_MODE_ETA && CRYPTO_OP_IS_ENCRYPT(crp->crp_op)) { error = padlock_hash_process(ses, crp, csp); 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 (0); } 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_probesession, padlock_probesession), 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);