sys/crypto/via/padlock.c

   1 /*-
   2  * Copyright (c) 2005-2008 Pawel Jakub Dawidek <pjd@FreeBSD.org>
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  *
  26  * $FreeBSD: src/sys/crypto/via/padlock.c,v 1.23 2009/02/05 19:30:28 imp Exp $
  27  */
  28
  29 #include <sys/param.h>
  30 #include <sys/systm.h>
  31 #include <sys/kernel.h>
  32 #include <sys/module.h>
  33 #include <sys/lock.h>
  34 #include <sys/spinlock.h>
  35 #include <sys/spinlock2.h>
  36 #include <sys/malloc.h>
  37 #include <sys/libkern.h>
  38 #if defined(__x86_64__) || defined(__i386__)
  39 #include <machine/cpufunc.h>
  40 #include <machine/cputypes.h>
  41 #include <machine/md_var.h>
  42 #include <machine/specialreg.h>
  43 #endif
  44
  45 #include <opencrypto/cryptodev.h>
  46
  47 #include <crypto/via/padlock.h>
  48
  49 #include <sys/kobj.h>
  50 #include <sys/bus.h>
  51 #include "cryptodev_if.h"
  52
  53 /*
  54  * Technical documentation about the PadLock engine can be found here:
  55  *
  56  * http://www.via.com.tw/en/downloads/whitepapers/initiatives/padlock/programming_guide.pdf
  57  */
  58
  59 struct padlock_softc {
  60         int32_t         sc_cid;
  61         uint32_t        sc_sid;
  62         TAILQ_HEAD(padlock_sessions_head, padlock_session) sc_sessions;
  63         struct spinlock sc_sessions_lock;
  64 };
  65
  66 static int padlock_newsession(device_t, uint32_t *sidp, struct cryptoini *cri);
  67 static int padlock_freesession(device_t, uint64_t tid);
  68 static void padlock_freesession_one(struct padlock_softc *sc,
  69     struct padlock_session *ses, int locked);
  70 static int padlock_process(device_t, struct cryptop *crp, int hint __unused);
  71
  72 MALLOC_DEFINE(M_PADLOCK, "padlock_data", "PadLock Data");
  73
  74 static void
  75 padlock_identify(driver_t *drv, device_t parent)
  76 {
  77         /* NB: order 10 is so we get attached after h/w devices */
  78         /* XXX: wouldn't bet about this BUS_ADD_CHILD correctness */
  79         if (device_find_child(parent, "padlock", -1) == NULL &&
  80             BUS_ADD_CHILD(parent, parent, 10, "padlock", -1) == 0)
  81                 panic("padlock: could not attach");
  82 }
  83
  84 static int
  85 padlock_probe(device_t dev)
  86 {
  87         char capp[256];
  88
  89 #if defined(__x86_64__) || defined(__i386__)
  90         /* If there is no AES support, we has nothing to do here. */
  91         if (!(via_feature_xcrypt & VIA_HAS_AES)) {
  92                 device_printf(dev, "No ACE support.\n");
  93                 return (EINVAL);
  94         }
  95         strlcpy(capp, "AES-CBC", sizeof(capp));
  96 #if 0
  97         strlcat(capp, ",AES-EBC", sizeof(capp));
  98         strlcat(capp, ",AES-CFB", sizeof(capp));
  99         strlcat(capp, ",AES-OFB", sizeof(capp));
 100 #endif
 101         if (via_feature_xcrypt & VIA_HAS_SHA) {
 102                 strlcat(capp, ",SHA1", sizeof(capp));
 103                 strlcat(capp, ",SHA256", sizeof(capp));
 104         }
 105 #if 0
 106         if (via_feature_xcrypt & VIA_HAS_AESCTR)
 107                 strlcat(capp, ",AES-CTR", sizeof(capp));
 108         if (via_feature_xcrypt & VIA_HAS_MM)
 109                 strlcat(capp, ",RSA", sizeof(capp));
 110 #endif
 111         device_set_desc_copy(dev, capp);
 112         return (0);
 113 #else
 114         return (EINVAL);
 115 #endif
 116 }
 117
 118 static int
 119 padlock_attach(device_t dev)
 120 {
 121         struct padlock_softc *sc = device_get_softc(dev);
 122
 123         TAILQ_INIT(&sc->sc_sessions);
 124         sc->sc_sid = 1;
 125
 126         sc->sc_cid = crypto_get_driverid(dev, CRYPTOCAP_F_HARDWARE);
 127         if (sc->sc_cid < 0) {
 128                 device_printf(dev, "Could not get crypto driver id.\n");
 129                 return (ENOMEM);
 130         }
 131
 132         spin_init(&sc->sc_sessions_lock);
 133         crypto_register(sc->sc_cid, CRYPTO_AES_CBC, 0, 0);
 134         crypto_register(sc->sc_cid, CRYPTO_MD5_HMAC, 0, 0);
 135         crypto_register(sc->sc_cid, CRYPTO_SHA1_HMAC, 0, 0);
 136         crypto_register(sc->sc_cid, CRYPTO_RIPEMD160_HMAC, 0, 0);
 137         crypto_register(sc->sc_cid, CRYPTO_SHA2_256_HMAC, 0, 0);
 138         crypto_register(sc->sc_cid, CRYPTO_SHA2_384_HMAC, 0, 0);
 139         crypto_register(sc->sc_cid, CRYPTO_SHA2_512_HMAC, 0, 0);
 140         return (0);
 141 }
 142
 143 static int
 144 padlock_detach(device_t dev)
 145 {
 146         struct padlock_softc *sc = device_get_softc(dev);
 147         struct padlock_session *ses;
 148
 149         spin_lock(&sc->sc_sessions_lock);
 150         TAILQ_FOREACH(ses, &sc->sc_sessions, ses_next) {
 151                 if (ses->ses_used) {
 152                         spin_unlock(&sc->sc_sessions_lock);
 153                         device_printf(dev,
 154                             "Cannot detach, sessions still active.\n");
 155                         return (EBUSY);
 156                 }
 157         }
 158         while ((ses = TAILQ_FIRST(&sc->sc_sessions)) != NULL) {
 159                 TAILQ_REMOVE(&sc->sc_sessions, ses, ses_next);
 160                 kfree(ses->ses_freeaddr, M_PADLOCK);
 161         }
 162         spin_unlock(&sc->sc_sessions_lock);
 163         spin_uninit(&sc->sc_sessions_lock);
 164         crypto_unregister_all(sc->sc_cid);
 165         return (0);
 166 }
 167
 168 static int
 169 padlock_newsession(device_t dev, uint32_t *sidp, struct cryptoini *cri)
 170 {
 171         struct padlock_softc *sc = device_get_softc(dev);
 172         struct padlock_session *ases, *ses = NULL;
 173         struct cryptoini *encini, *macini;
 174         int error;
 175
 176         if (sidp == NULL || cri == NULL)
 177                 return (EINVAL);
 178
 179         encini = macini = NULL;
 180         for (; cri != NULL; cri = cri->cri_next) {
 181                 switch (cri->cri_alg) {
 182                 case CRYPTO_NULL_HMAC:
 183                 case CRYPTO_MD5_HMAC:
 184                 case CRYPTO_SHA1_HMAC:
 185                 case CRYPTO_RIPEMD160_HMAC:
 186                 case CRYPTO_SHA2_256_HMAC:
 187                 case CRYPTO_SHA2_384_HMAC:
 188                 case CRYPTO_SHA2_512_HMAC:
 189                         if (macini != NULL)
 190                                 return (EINVAL);
 191                         macini = cri;
 192                         break;
 193                 case CRYPTO_AES_CBC:
 194                         if (encini != NULL)
 195                                 return (EINVAL);
 196                         encini = cri;
 197                         break;
 198                 default:
 199                         return (EINVAL);
 200                 }
 201         }
 202
 203         /*
 204          * We only support HMAC algorithms to be able to work with
 205          * ipsec(4), so if we are asked only for authentication without
 206          * encryption, don't pretend we can accellerate it.
 207          */
 208         if (encini == NULL)
 209                 return (EINVAL);
 210
 211         /*
 212          * Let's look for a free session structure.
 213          */
 214         spin_lock(&sc->sc_sessions_lock);
 215         /*
 216          * Free sessions goes first, so if first session is used, we need to
 217          * allocate one.
 218          */
 219         ses = TAILQ_FIRST(&sc->sc_sessions);
 220         if (ses == NULL || ses->ses_used) {
 221                 ses = kmalloc(sizeof(*ses) + 16, M_PADLOCK, M_NOWAIT | M_ZERO);
 222                 if (ses == NULL) {
 223                         spin_unlock(&sc->sc_sessions_lock);
 224                         return (ENOMEM);
 225                 }
 226                 /* Check if 'ses' is 16-byte aligned. If not, align it. */
 227                 if (((uintptr_t)ses & 0xf) != 0) {
 228                         ases = PADLOCK_ALIGN(ses);
 229                         ases->ses_freeaddr = ses;
 230                         ses = ases;
 231                 } else {
 232                         ses->ses_freeaddr = ses;
 233                 }
 234                 ses->ses_id = sc->sc_sid++;
 235         } else {
 236                 TAILQ_REMOVE(&sc->sc_sessions, ses, ses_next);
 237         }
 238         ses->ses_used = 1;
 239         TAILQ_INSERT_TAIL(&sc->sc_sessions, ses, ses_next);
 240         spin_unlock(&sc->sc_sessions_lock);
 241
 242         error = padlock_cipher_setup(ses, encini);
 243         if (error != 0) {
 244                 padlock_freesession_one(sc, ses, 0);
 245                 return (error);
 246         }
 247
 248         if (macini != NULL) {
 249                 error = padlock_hash_setup(ses, macini);
 250                 if (error != 0) {
 251                         padlock_freesession_one(sc, ses, 0);
 252                         return (error);
 253                 }
 254         }
 255
 256         *sidp = ses->ses_id;
 257         return (0);
 258 }
 259
 260 static void
 261 padlock_freesession_one(struct padlock_softc *sc, struct padlock_session *ses,
 262     int locked)
 263 {
 264         uint32_t sid = ses->ses_id;
 265         void *freeaddr = ses->ses_freeaddr;
 266
 267         if (!locked)
 268                 spin_lock(&sc->sc_sessions_lock);
 269         TAILQ_REMOVE(&sc->sc_sessions, ses, ses_next);
 270         padlock_hash_free(ses);
 271         bzero(ses, sizeof(*ses));
 272         ses->ses_used = 0;
 273         ses->ses_id = sid;
 274         ses->ses_freeaddr = freeaddr;
 275         TAILQ_INSERT_HEAD(&sc->sc_sessions, ses, ses_next);
 276         if (!locked)
 277                 spin_unlock(&sc->sc_sessions_lock);
 278 }
 279
 280 static int
 281 padlock_freesession(device_t dev, uint64_t tid)
 282 {
 283         struct padlock_softc *sc = device_get_softc(dev);
 284         struct padlock_session *ses;
 285         uint32_t sid = ((uint32_t)tid) & 0xffffffff;
 286
 287         spin_lock(&sc->sc_sessions_lock);
 288         TAILQ_FOREACH_REVERSE(ses, &sc->sc_sessions, padlock_sessions_head,
 289             ses_next) {
 290                 if (ses->ses_id == sid)
 291                         break;
 292         }
 293         if (ses == NULL) {
 294                 spin_unlock(&sc->sc_sessions_lock);
 295                 return (EINVAL);
 296         }
 297         padlock_freesession_one(sc, ses, 1);
 298         spin_unlock(&sc->sc_sessions_lock);
 299         return (0);
 300 }
 301
 302 static int
 303 padlock_process(device_t dev, struct cryptop *crp, int hint __unused)
 304 {
 305         struct padlock_softc *sc = device_get_softc(dev);
 306         struct padlock_session *ses = NULL;
 307         struct cryptodesc *crd, *enccrd, *maccrd;
 308         int error = 0;
 309
 310         enccrd = maccrd = NULL;
 311
 312         /* Sanity check. */
 313         if (crp == NULL)
 314                 return (EINVAL);
 315
 316         if (crp->crp_callback == NULL || crp->crp_desc == NULL) {
 317                 error = EINVAL;
 318                 goto out;
 319         }
 320
 321         for (crd = crp->crp_desc; crd != NULL; crd = crd->crd_next) {
 322                 switch (crd->crd_alg) {
 323                 case CRYPTO_NULL_HMAC:
 324                 case CRYPTO_MD5_HMAC:
 325                 case CRYPTO_SHA1_HMAC:
 326                 case CRYPTO_RIPEMD160_HMAC:
 327                 case CRYPTO_SHA2_256_HMAC:
 328                 case CRYPTO_SHA2_384_HMAC:
 329                 case CRYPTO_SHA2_512_HMAC:
 330                         if (maccrd != NULL) {
 331                                 error = EINVAL;
 332                                 goto out;
 333                         }
 334                         maccrd = crd;
 335                         break;
 336                 case CRYPTO_AES_CBC:
 337                         if (enccrd != NULL) {
 338                                 error = EINVAL;
 339                                 goto out;
 340                         }
 341                         enccrd = crd;
 342                         break;
 343                 default:
 344                         return (EINVAL);
 345                 }
 346         }
 347         if (enccrd == NULL || (enccrd->crd_len % AES_BLOCK_LEN) != 0) {
 348                 error = EINVAL;
 349                 goto out;
 350         }
 351
 352         spin_lock(&sc->sc_sessions_lock); /* XXX: was rd lock */
 353         TAILQ_FOREACH_REVERSE(ses, &sc->sc_sessions, padlock_sessions_head,
 354             ses_next) {
 355                 if (ses->ses_id == (crp->crp_sid & 0xffffffff))
 356                         break;
 357         }
 358         spin_unlock(&sc->sc_sessions_lock); /* XXX: was rd lock */
 359         if (ses == NULL) {
 360                 error = EINVAL;
 361                 goto out;
 362         }
 363
 364         /* Perform data authentication if requested before encryption. */
 365         if (maccrd != NULL && maccrd->crd_next == enccrd) {
 366                 error = padlock_hash_process(ses, maccrd, crp);
 367                 if (error != 0)
 368                         goto out;
 369         }
 370
 371         error = padlock_cipher_process(ses, enccrd, crp);
 372         if (error != 0)
 373                 goto out;
 374
 375         /* Perform data authentication if requested after encryption. */
 376         if (maccrd != NULL && enccrd->crd_next == maccrd) {
 377                 error = padlock_hash_process(ses, maccrd, crp);
 378                 if (error != 0)
 379                         goto out;
 380         }
 381
 382 out:
 383 #if 0
 384         /*
 385          * This code is not necessary, because contexts will be freed on next
 386          * padlock_setup_mackey() call or at padlock_freesession() call.
 387          */
 388         if (ses != NULL && maccrd != NULL &&
 389             (maccrd->crd_flags & CRD_F_KEY_EXPLICIT) != 0) {
 390                 padlock_free_ctx(ses->ses_axf, ses->ses_ictx);
 391                 padlock_free_ctx(ses->ses_axf, ses->ses_octx);
 392         }
 393 #endif
 394         crp->crp_etype = error;
 395         crypto_done(crp);
 396         return (error);
 397 }
 398
 399 static device_method_t padlock_methods[] = {
 400         DEVMETHOD(device_identify,      padlock_identify),
 401         DEVMETHOD(device_probe,         padlock_probe),
 402         DEVMETHOD(device_attach,        padlock_attach),
 403         DEVMETHOD(device_detach,        padlock_detach),
 404
 405         DEVMETHOD(cryptodev_newsession, padlock_newsession),
 406         DEVMETHOD(cryptodev_freesession,padlock_freesession),
 407         DEVMETHOD(cryptodev_process,    padlock_process),
 408
 409         {0, 0},
 410 };
 411
 412 static driver_t padlock_driver = {
 413         "padlock",
 414         padlock_methods,
 415         sizeof(struct padlock_softc),
 416 };
 417 static devclass_t padlock_devclass;
 418
 419 /* XXX where to attach */
 420 DRIVER_MODULE(padlock, nexus, padlock_driver, padlock_devclass, 0, 0);
 421 MODULE_VERSION(padlock, 1);
 422 MODULE_DEPEND(padlock, crypto, 1, 1, 1);