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