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/param.h> 28 #include <sys/systm.h> 29 #include <sys/kernel.h> 30 #include <sys/module.h> 31 #include <sys/lock.h> 32 #include <sys/rwlock.h> 33 #include <sys/malloc.h> 34 #include <sys/libkern.h> 35 #if defined(__amd64__) || defined(__i386__) 36 #include <machine/cpufunc.h> 37 #include <machine/cputypes.h> 38 #include <machine/fpu.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_session *ses); 66 static int padlock_process(device_t, struct cryptop *crp, int hint __unused); 67 68 MALLOC_DEFINE(M_PADLOCK, "padlock_data", "PadLock Data"); 69 70 static void 71 padlock_identify(driver_t *drv, device_t parent) 72 { 73 /* NB: order 10 is so we get attached after h/w devices */ 74 if (device_find_child(parent, "padlock", -1) == NULL && 75 BUS_ADD_CHILD(parent, 10, "padlock", -1) == 0) 76 panic("padlock: could not attach"); 77 } 78 79 static int 80 padlock_probe(device_t dev) 81 { 82 char capp[256]; 83 84 #if defined(__amd64__) || defined(__i386__) 85 /* If there is no AES support, we has nothing to do here. */ 86 if (!(via_feature_xcrypt & VIA_HAS_AES)) { 87 device_printf(dev, "No ACE support.\n"); 88 return (EINVAL); 89 } 90 strlcpy(capp, "AES-CBC", sizeof(capp)); 91 #if 0 92 strlcat(capp, ",AES-EBC", sizeof(capp)); 93 strlcat(capp, ",AES-CFB", sizeof(capp)); 94 strlcat(capp, ",AES-OFB", sizeof(capp)); 95 #endif 96 if (via_feature_xcrypt & VIA_HAS_SHA) { 97 strlcat(capp, ",SHA1", sizeof(capp)); 98 strlcat(capp, ",SHA256", sizeof(capp)); 99 } 100 #if 0 101 if (via_feature_xcrypt & VIA_HAS_AESCTR) 102 strlcat(capp, ",AES-CTR", sizeof(capp)); 103 if (via_feature_xcrypt & VIA_HAS_MM) 104 strlcat(capp, ",RSA", sizeof(capp)); 105 #endif 106 device_set_desc_copy(dev, capp); 107 return (0); 108 #else 109 return (EINVAL); 110 #endif 111 } 112 113 static int 114 padlock_attach(device_t dev) 115 { 116 struct padlock_softc *sc = device_get_softc(dev); 117 118 sc->sc_cid = crypto_get_driverid(dev, sizeof(struct padlock_session), 119 CRYPTOCAP_F_SOFTWARE | CRYPTOCAP_F_SYNC | 120 CRYPTOCAP_F_ACCEL_SOFTWARE); 121 if (sc->sc_cid < 0) { 122 device_printf(dev, "Could not get crypto driver id.\n"); 123 return (ENOMEM); 124 } 125 126 return (0); 127 } 128 129 static int 130 padlock_detach(device_t dev) 131 { 132 struct padlock_softc *sc = device_get_softc(dev); 133 134 crypto_unregister_all(sc->sc_cid); 135 return (0); 136 } 137 138 static int 139 padlock_probesession(device_t dev, const struct crypto_session_params *csp) 140 { 141 142 if (csp->csp_flags != 0) 143 return (EINVAL); 144 145 /* 146 * We only support HMAC algorithms to be able to work with 147 * ipsec(4), so if we are asked only for authentication without 148 * encryption, don't pretend we can accelerate it. 149 * 150 * XXX: For CPUs with SHA instructions we should probably 151 * permit CSP_MODE_DIGEST so that those can be tested. 152 */ 153 switch (csp->csp_mode) { 154 case CSP_MODE_ETA: 155 if (!padlock_hash_check(csp)) 156 return (EINVAL); 157 /* FALLTHROUGH */ 158 case CSP_MODE_CIPHER: 159 switch (csp->csp_cipher_alg) { 160 case CRYPTO_AES_CBC: 161 if (csp->csp_ivlen != AES_BLOCK_LEN) 162 return (EINVAL); 163 break; 164 default: 165 return (EINVAL); 166 } 167 break; 168 default: 169 return (EINVAL); 170 } 171 172 return (CRYPTODEV_PROBE_ACCEL_SOFTWARE); 173 } 174 175 static int 176 padlock_newsession(device_t dev, crypto_session_t cses, 177 const struct crypto_session_params *csp) 178 { 179 struct padlock_session *ses; 180 struct thread *td; 181 int error; 182 183 ses = crypto_get_driver_session(cses); 184 185 error = padlock_cipher_setup(ses, csp); 186 if (error != 0) { 187 padlock_freesession_one(ses); 188 return (error); 189 } 190 191 if (csp->csp_mode == CSP_MODE_ETA) { 192 td = curthread; 193 fpu_kern_enter(td, NULL, FPU_KERN_NORMAL | FPU_KERN_NOCTX); 194 error = padlock_hash_setup(ses, csp); 195 fpu_kern_leave(td, NULL); 196 if (error != 0) { 197 padlock_freesession_one(ses); 198 return (error); 199 } 200 } 201 202 return (0); 203 } 204 205 static void 206 padlock_freesession_one(struct padlock_session *ses) 207 { 208 209 padlock_hash_free(ses); 210 } 211 212 static void 213 padlock_freesession(device_t dev, crypto_session_t cses) 214 { 215 struct padlock_session *ses; 216 217 ses = crypto_get_driver_session(cses); 218 padlock_freesession_one(ses); 219 } 220 221 static int 222 padlock_process(device_t dev, struct cryptop *crp, int hint __unused) 223 { 224 const struct crypto_session_params *csp; 225 struct padlock_session *ses; 226 int error; 227 228 if ((crp->crp_payload_length % AES_BLOCK_LEN) != 0) { 229 error = EINVAL; 230 goto out; 231 } 232 233 ses = crypto_get_driver_session(crp->crp_session); 234 csp = crypto_get_params(crp->crp_session); 235 236 /* Perform data authentication if requested before decryption. */ 237 if (csp->csp_mode == CSP_MODE_ETA && 238 !CRYPTO_OP_IS_ENCRYPT(crp->crp_op)) { 239 error = padlock_hash_process(ses, crp, csp); 240 if (error != 0) 241 goto out; 242 } 243 244 error = padlock_cipher_process(ses, crp, csp); 245 if (error != 0) 246 goto out; 247 248 /* Perform data authentication if requested after encryption. */ 249 if (csp->csp_mode == CSP_MODE_ETA && 250 CRYPTO_OP_IS_ENCRYPT(crp->crp_op)) { 251 error = padlock_hash_process(ses, crp, csp); 252 if (error != 0) 253 goto out; 254 } 255 256 out: 257 #if 0 258 /* 259 * This code is not necessary, because contexts will be freed on next 260 * padlock_setup_mackey() call or at padlock_freesession() call. 261 */ 262 if (ses != NULL && maccrd != NULL && 263 (maccrd->crd_flags & CRD_F_KEY_EXPLICIT) != 0) { 264 padlock_free_ctx(ses->ses_axf, ses->ses_ictx); 265 padlock_free_ctx(ses->ses_axf, ses->ses_octx); 266 } 267 #endif 268 crp->crp_etype = error; 269 crypto_done(crp); 270 return (0); 271 } 272 273 static device_method_t padlock_methods[] = { 274 DEVMETHOD(device_identify, padlock_identify), 275 DEVMETHOD(device_probe, padlock_probe), 276 DEVMETHOD(device_attach, padlock_attach), 277 DEVMETHOD(device_detach, padlock_detach), 278 279 DEVMETHOD(cryptodev_probesession, padlock_probesession), 280 DEVMETHOD(cryptodev_newsession, padlock_newsession), 281 DEVMETHOD(cryptodev_freesession,padlock_freesession), 282 DEVMETHOD(cryptodev_process, padlock_process), 283 284 {0, 0}, 285 }; 286 287 static driver_t padlock_driver = { 288 "padlock", 289 padlock_methods, 290 sizeof(struct padlock_softc), 291 }; 292 293 /* XXX where to attach */ 294 DRIVER_MODULE(padlock, nexus, padlock_driver, 0, 0); 295 MODULE_VERSION(padlock, 1); 296 MODULE_DEPEND(padlock, crypto, 1, 1, 1); 297