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 #include <sys/param.h> 29 #include <sys/systm.h> 30 #include <sys/kernel.h> 31 #include <sys/module.h> 32 #include <sys/lock.h> 33 #include <sys/rwlock.h> 34 #include <sys/malloc.h> 35 #include <sys/libkern.h> 36 #if defined(__amd64__) || defined(__i386__) 37 #include <machine/cpufunc.h> 38 #include <machine/cputypes.h> 39 #include <machine/md_var.h> 40 #include <machine/specialreg.h> 41 #endif 42 43 #include <opencrypto/cryptodev.h> 44 45 #include <crypto/via/padlock.h> 46 47 #include <sys/kobj.h> 48 #include <sys/bus.h> 49 #include "cryptodev_if.h" 50 51 /* 52 * Technical documentation about the PadLock engine can be found here: 53 * 54 * http://www.via.com.tw/en/downloads/whitepapers/initiatives/padlock/programming_guide.pdf 55 */ 56 57 struct padlock_softc { 58 int32_t sc_cid; 59 }; 60 61 static int padlock_probesession(device_t, const struct crypto_session_params *); 62 static int padlock_newsession(device_t, crypto_session_t cses, 63 const struct crypto_session_params *); 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_SOFTWARE | CRYPTOCAP_F_SYNC | 121 CRYPTOCAP_F_ACCEL_SOFTWARE); 122 if (sc->sc_cid < 0) { 123 device_printf(dev, "Could not get crypto driver id.\n"); 124 return (ENOMEM); 125 } 126 127 return (0); 128 } 129 130 static int 131 padlock_detach(device_t dev) 132 { 133 struct padlock_softc *sc = device_get_softc(dev); 134 135 crypto_unregister_all(sc->sc_cid); 136 return (0); 137 } 138 139 static int 140 padlock_probesession(device_t dev, const struct crypto_session_params *csp) 141 { 142 143 if (csp->csp_flags != 0) 144 return (EINVAL); 145 146 /* 147 * We only support HMAC algorithms to be able to work with 148 * ipsec(4), so if we are asked only for authentication without 149 * encryption, don't pretend we can accelerate it. 150 * 151 * XXX: For CPUs with SHA instructions we should probably 152 * permit CSP_MODE_DIGEST so that those can be tested. 153 */ 154 switch (csp->csp_mode) { 155 case CSP_MODE_ETA: 156 if (!padlock_hash_check(csp)) 157 return (EINVAL); 158 /* FALLTHROUGH */ 159 case CSP_MODE_CIPHER: 160 switch (csp->csp_cipher_alg) { 161 case CRYPTO_AES_CBC: 162 if (csp->csp_ivlen != AES_BLOCK_LEN) 163 return (EINVAL); 164 break; 165 default: 166 return (EINVAL); 167 } 168 break; 169 default: 170 return (EINVAL); 171 } 172 173 return (CRYPTODEV_PROBE_ACCEL_SOFTWARE); 174 } 175 176 static int 177 padlock_newsession(device_t dev, crypto_session_t cses, 178 const struct crypto_session_params *csp) 179 { 180 struct padlock_softc *sc = device_get_softc(dev); 181 struct padlock_session *ses = NULL; 182 struct thread *td; 183 int error; 184 185 ses = crypto_get_driver_session(cses); 186 ses->ses_fpu_ctx = fpu_kern_alloc_ctx(FPU_KERN_NORMAL); 187 188 error = padlock_cipher_setup(ses, csp); 189 if (error != 0) { 190 padlock_freesession_one(sc, ses); 191 return (error); 192 } 193 194 if (csp->csp_mode == CSP_MODE_ETA) { 195 td = curthread; 196 fpu_kern_enter(td, ses->ses_fpu_ctx, FPU_KERN_NORMAL | 197 FPU_KERN_KTHR); 198 error = padlock_hash_setup(ses, csp); 199 fpu_kern_leave(td, ses->ses_fpu_ctx); 200 if (error != 0) { 201 padlock_freesession_one(sc, ses); 202 return (error); 203 } 204 } 205 206 return (0); 207 } 208 209 static void 210 padlock_freesession_one(struct padlock_softc *sc, struct padlock_session *ses) 211 { 212 213 padlock_hash_free(ses); 214 fpu_kern_free_ctx(ses->ses_fpu_ctx); 215 } 216 217 static void 218 padlock_freesession(device_t dev, crypto_session_t cses) 219 { 220 struct padlock_softc *sc = device_get_softc(dev); 221 struct padlock_session *ses; 222 223 ses = crypto_get_driver_session(cses); 224 padlock_freesession_one(sc, ses); 225 } 226 227 static int 228 padlock_process(device_t dev, struct cryptop *crp, int hint __unused) 229 { 230 const struct crypto_session_params *csp; 231 struct padlock_session *ses; 232 int error; 233 234 if ((crp->crp_payload_length % AES_BLOCK_LEN) != 0) { 235 error = EINVAL; 236 goto out; 237 } 238 239 ses = crypto_get_driver_session(crp->crp_session); 240 csp = crypto_get_params(crp->crp_session); 241 242 /* Perform data authentication if requested before decryption. */ 243 if (csp->csp_mode == CSP_MODE_ETA && 244 !CRYPTO_OP_IS_ENCRYPT(crp->crp_op)) { 245 error = padlock_hash_process(ses, crp, csp); 246 if (error != 0) 247 goto out; 248 } 249 250 error = padlock_cipher_process(ses, crp, csp); 251 if (error != 0) 252 goto out; 253 254 /* Perform data authentication if requested after encryption. */ 255 if (csp->csp_mode == CSP_MODE_ETA && 256 CRYPTO_OP_IS_ENCRYPT(crp->crp_op)) { 257 error = padlock_hash_process(ses, crp, csp); 258 if (error != 0) 259 goto out; 260 } 261 262 out: 263 #if 0 264 /* 265 * This code is not necessary, because contexts will be freed on next 266 * padlock_setup_mackey() call or at padlock_freesession() call. 267 */ 268 if (ses != NULL && maccrd != NULL && 269 (maccrd->crd_flags & CRD_F_KEY_EXPLICIT) != 0) { 270 padlock_free_ctx(ses->ses_axf, ses->ses_ictx); 271 padlock_free_ctx(ses->ses_axf, ses->ses_octx); 272 } 273 #endif 274 crp->crp_etype = error; 275 crypto_done(crp); 276 return (0); 277 } 278 279 static device_method_t padlock_methods[] = { 280 DEVMETHOD(device_identify, padlock_identify), 281 DEVMETHOD(device_probe, padlock_probe), 282 DEVMETHOD(device_attach, padlock_attach), 283 DEVMETHOD(device_detach, padlock_detach), 284 285 DEVMETHOD(cryptodev_probesession, padlock_probesession), 286 DEVMETHOD(cryptodev_newsession, padlock_newsession), 287 DEVMETHOD(cryptodev_freesession,padlock_freesession), 288 DEVMETHOD(cryptodev_process, padlock_process), 289 290 {0, 0}, 291 }; 292 293 static driver_t padlock_driver = { 294 "padlock", 295 padlock_methods, 296 sizeof(struct padlock_softc), 297 }; 298 299 /* XXX where to attach */ 300 DRIVER_MODULE(padlock, nexus, padlock_driver, 0, 0); 301 MODULE_VERSION(padlock, 1); 302 MODULE_DEPEND(padlock, crypto, 1, 1, 1); 303