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 27 #include <sys/cdefs.h> 28 __FBSDID("$FreeBSD$"); 29 30 #include <sys/param.h> 31 #include <sys/systm.h> 32 #include <sys/kernel.h> 33 #include <sys/module.h> 34 #include <sys/lock.h> 35 #include <sys/rwlock.h> 36 #include <sys/malloc.h> 37 #include <sys/libkern.h> 38 #if defined(__amd64__) || 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 }; 62 63 static int padlock_newsession(device_t, crypto_session_t cses, struct cryptoini *cri); 64 static void padlock_freesession(device_t, crypto_session_t cses); 65 static void padlock_freesession_one(struct padlock_softc *sc, 66 struct padlock_session *ses); 67 static int padlock_process(device_t, struct cryptop *crp, int hint __unused); 68 69 MALLOC_DEFINE(M_PADLOCK, "padlock_data", "PadLock Data"); 70 71 static void 72 padlock_identify(driver_t *drv, device_t parent) 73 { 74 /* NB: order 10 is so we get attached after h/w devices */ 75 if (device_find_child(parent, "padlock", -1) == NULL && 76 BUS_ADD_CHILD(parent, 10, "padlock", -1) == 0) 77 panic("padlock: could not attach"); 78 } 79 80 static int 81 padlock_probe(device_t dev) 82 { 83 char capp[256]; 84 85 #if defined(__amd64__) || defined(__i386__) 86 /* If there is no AES support, we has nothing to do here. */ 87 if (!(via_feature_xcrypt & VIA_HAS_AES)) { 88 device_printf(dev, "No ACE support.\n"); 89 return (EINVAL); 90 } 91 strlcpy(capp, "AES-CBC", sizeof(capp)); 92 #if 0 93 strlcat(capp, ",AES-EBC", sizeof(capp)); 94 strlcat(capp, ",AES-CFB", sizeof(capp)); 95 strlcat(capp, ",AES-OFB", sizeof(capp)); 96 #endif 97 if (via_feature_xcrypt & VIA_HAS_SHA) { 98 strlcat(capp, ",SHA1", sizeof(capp)); 99 strlcat(capp, ",SHA256", sizeof(capp)); 100 } 101 #if 0 102 if (via_feature_xcrypt & VIA_HAS_AESCTR) 103 strlcat(capp, ",AES-CTR", sizeof(capp)); 104 if (via_feature_xcrypt & VIA_HAS_MM) 105 strlcat(capp, ",RSA", sizeof(capp)); 106 #endif 107 device_set_desc_copy(dev, capp); 108 return (0); 109 #else 110 return (EINVAL); 111 #endif 112 } 113 114 static int 115 padlock_attach(device_t dev) 116 { 117 struct padlock_softc *sc = device_get_softc(dev); 118 119 sc->sc_cid = crypto_get_driverid(dev, sizeof(struct padlock_session), 120 CRYPTOCAP_F_HARDWARE); 121 if (sc->sc_cid < 0) { 122 device_printf(dev, "Could not get crypto driver id.\n"); 123 return (ENOMEM); 124 } 125 126 crypto_register(sc->sc_cid, CRYPTO_AES_CBC, 0, 0); 127 crypto_register(sc->sc_cid, CRYPTO_MD5_HMAC, 0, 0); 128 crypto_register(sc->sc_cid, CRYPTO_SHA1_HMAC, 0, 0); 129 crypto_register(sc->sc_cid, CRYPTO_RIPEMD160_HMAC, 0, 0); 130 crypto_register(sc->sc_cid, CRYPTO_SHA2_256_HMAC, 0, 0); 131 crypto_register(sc->sc_cid, CRYPTO_SHA2_384_HMAC, 0, 0); 132 crypto_register(sc->sc_cid, CRYPTO_SHA2_512_HMAC, 0, 0); 133 return (0); 134 } 135 136 static int 137 padlock_detach(device_t dev) 138 { 139 struct padlock_softc *sc = device_get_softc(dev); 140 141 crypto_unregister_all(sc->sc_cid); 142 return (0); 143 } 144 145 static int 146 padlock_newsession(device_t dev, crypto_session_t cses, struct cryptoini *cri) 147 { 148 struct padlock_softc *sc = device_get_softc(dev); 149 struct padlock_session *ses = NULL; 150 struct cryptoini *encini, *macini; 151 struct thread *td; 152 int error; 153 154 if (cri == NULL) 155 return (EINVAL); 156 157 encini = macini = NULL; 158 for (; cri != NULL; cri = cri->cri_next) { 159 switch (cri->cri_alg) { 160 case CRYPTO_NULL_HMAC: 161 case CRYPTO_MD5_HMAC: 162 case CRYPTO_SHA1_HMAC: 163 case CRYPTO_RIPEMD160_HMAC: 164 case CRYPTO_SHA2_256_HMAC: 165 case CRYPTO_SHA2_384_HMAC: 166 case CRYPTO_SHA2_512_HMAC: 167 if (macini != NULL) 168 return (EINVAL); 169 macini = cri; 170 break; 171 case CRYPTO_AES_CBC: 172 if (encini != NULL) 173 return (EINVAL); 174 encini = cri; 175 break; 176 default: 177 return (EINVAL); 178 } 179 } 180 181 /* 182 * We only support HMAC algorithms to be able to work with 183 * ipsec(4), so if we are asked only for authentication without 184 * encryption, don't pretend we can accellerate it. 185 */ 186 if (encini == NULL) 187 return (EINVAL); 188 189 ses = crypto_get_driver_session(cses); 190 ses->ses_fpu_ctx = fpu_kern_alloc_ctx(FPU_KERN_NORMAL); 191 192 error = padlock_cipher_setup(ses, encini); 193 if (error != 0) { 194 padlock_freesession_one(sc, ses); 195 return (error); 196 } 197 198 if (macini != NULL) { 199 td = curthread; 200 fpu_kern_enter(td, ses->ses_fpu_ctx, FPU_KERN_NORMAL | 201 FPU_KERN_KTHR); 202 error = padlock_hash_setup(ses, macini); 203 fpu_kern_leave(td, ses->ses_fpu_ctx); 204 if (error != 0) { 205 padlock_freesession_one(sc, ses); 206 return (error); 207 } 208 } 209 210 return (0); 211 } 212 213 static void 214 padlock_freesession_one(struct padlock_softc *sc, struct padlock_session *ses) 215 { 216 217 padlock_hash_free(ses); 218 fpu_kern_free_ctx(ses->ses_fpu_ctx); 219 } 220 221 static void 222 padlock_freesession(device_t dev, crypto_session_t cses) 223 { 224 struct padlock_softc *sc = device_get_softc(dev); 225 struct padlock_session *ses; 226 227 ses = crypto_get_driver_session(cses); 228 padlock_freesession_one(sc, ses); 229 } 230 231 static int 232 padlock_process(device_t dev, struct cryptop *crp, int hint __unused) 233 { 234 struct padlock_session *ses = NULL; 235 struct cryptodesc *crd, *enccrd, *maccrd; 236 int error = 0; 237 238 enccrd = maccrd = NULL; 239 240 /* Sanity check. */ 241 if (crp == NULL) 242 return (EINVAL); 243 244 if (crp->crp_callback == NULL || crp->crp_desc == NULL) { 245 error = EINVAL; 246 goto out; 247 } 248 249 for (crd = crp->crp_desc; crd != NULL; crd = crd->crd_next) { 250 switch (crd->crd_alg) { 251 case CRYPTO_NULL_HMAC: 252 case CRYPTO_MD5_HMAC: 253 case CRYPTO_SHA1_HMAC: 254 case CRYPTO_RIPEMD160_HMAC: 255 case CRYPTO_SHA2_256_HMAC: 256 case CRYPTO_SHA2_384_HMAC: 257 case CRYPTO_SHA2_512_HMAC: 258 if (maccrd != NULL) { 259 error = EINVAL; 260 goto out; 261 } 262 maccrd = crd; 263 break; 264 case CRYPTO_AES_CBC: 265 if (enccrd != NULL) { 266 error = EINVAL; 267 goto out; 268 } 269 enccrd = crd; 270 break; 271 default: 272 return (EINVAL); 273 } 274 } 275 if (enccrd == NULL || (enccrd->crd_len % AES_BLOCK_LEN) != 0) { 276 error = EINVAL; 277 goto out; 278 } 279 280 ses = crypto_get_driver_session(crp->crp_session); 281 282 /* Perform data authentication if requested before encryption. */ 283 if (maccrd != NULL && maccrd->crd_next == enccrd) { 284 error = padlock_hash_process(ses, maccrd, crp); 285 if (error != 0) 286 goto out; 287 } 288 289 error = padlock_cipher_process(ses, enccrd, crp); 290 if (error != 0) 291 goto out; 292 293 /* Perform data authentication if requested after encryption. */ 294 if (maccrd != NULL && enccrd->crd_next == maccrd) { 295 error = padlock_hash_process(ses, maccrd, crp); 296 if (error != 0) 297 goto out; 298 } 299 300 out: 301 #if 0 302 /* 303 * This code is not necessary, because contexts will be freed on next 304 * padlock_setup_mackey() call or at padlock_freesession() call. 305 */ 306 if (ses != NULL && maccrd != NULL && 307 (maccrd->crd_flags & CRD_F_KEY_EXPLICIT) != 0) { 308 padlock_free_ctx(ses->ses_axf, ses->ses_ictx); 309 padlock_free_ctx(ses->ses_axf, ses->ses_octx); 310 } 311 #endif 312 crp->crp_etype = error; 313 crypto_done(crp); 314 return (error); 315 } 316 317 static device_method_t padlock_methods[] = { 318 DEVMETHOD(device_identify, padlock_identify), 319 DEVMETHOD(device_probe, padlock_probe), 320 DEVMETHOD(device_attach, padlock_attach), 321 DEVMETHOD(device_detach, padlock_detach), 322 323 DEVMETHOD(cryptodev_newsession, padlock_newsession), 324 DEVMETHOD(cryptodev_freesession,padlock_freesession), 325 DEVMETHOD(cryptodev_process, padlock_process), 326 327 {0, 0}, 328 }; 329 330 static driver_t padlock_driver = { 331 "padlock", 332 padlock_methods, 333 sizeof(struct padlock_softc), 334 }; 335 static devclass_t padlock_devclass; 336 337 /* XXX where to attach */ 338 DRIVER_MODULE(padlock, nexus, padlock_driver, padlock_devclass, 0, 0); 339 MODULE_VERSION(padlock, 1); 340 MODULE_DEPEND(padlock, crypto, 1, 1, 1); 341