1 /*- 2 * Copyright (c) 2005-2008 Pawel Jakub Dawidek <pjd@FreeBSD.org> 3 * Copyright (c) 2010 Konstantin Belousov <kib@FreeBSD.org> 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 * 27 * $FreeBSD: src/sys/crypto/aesni/aesni.c,v 1.3 2010/09/23 11:57:25 pjd Exp $ 28 */ 29 30 #include <sys/param.h> 31 #include <sys/systm.h> 32 #include <sys/kernel.h> 33 #include <sys/kobj.h> 34 #include <sys/libkern.h> 35 #include <sys/lock.h> 36 #include <sys/module.h> 37 #include <sys/malloc.h> 38 #include <sys/spinlock.h> 39 #include <sys/spinlock2.h> 40 #include <sys/bus.h> 41 #include <sys/uio.h> 42 #include <dev/crypto/aesni/aesni.h> 43 #include "cryptodev_if.h" 44 45 struct aesni_softc { 46 int32_t cid; 47 uint32_t sid; 48 TAILQ_HEAD(aesni_sessions_head, aesni_session) sessions; 49 struct spinlock lock; 50 }; 51 52 static int aesni_newsession(device_t, uint32_t *sidp, struct cryptoini *cri); 53 static int aesni_freesession(device_t, uint64_t tid); 54 static void aesni_freesession_locked(struct aesni_softc *sc, 55 struct aesni_session *ses); 56 57 MALLOC_DEFINE(M_AESNI, "aesni_data", "AESNI Data"); 58 59 static void 60 aesni_identify(driver_t *drv, device_t parent) 61 { 62 63 /* NB: order 10 is so we get attached after h/w devices */ 64 if (device_find_child(parent, "aesni", -1) == NULL && 65 BUS_ADD_CHILD(parent, parent, 10, "aesni", -1) == 0) 66 panic("aesni: could not attach"); 67 } 68 69 static int 70 aesni_probe(device_t dev) 71 { 72 73 if ((cpu_feature2 & CPUID2_AESNI) == 0) { 74 device_printf(dev, "No AESNI support.\n"); 75 return (EINVAL); 76 } 77 device_set_desc_copy(dev, "AES-CBC,AES-XTS"); 78 return (0); 79 } 80 81 static int 82 aesni_attach(device_t dev) 83 { 84 struct aesni_softc *sc; 85 86 sc = device_get_softc(dev); 87 TAILQ_INIT(&sc->sessions); 88 sc->sid = 1; 89 sc->cid = crypto_get_driverid(dev, CRYPTOCAP_F_HARDWARE); 90 if (sc->cid < 0) { 91 device_printf(dev, "Could not get crypto driver id.\n"); 92 return (ENOMEM); 93 } 94 95 spin_init(&sc->lock, "aesniattach"); 96 crypto_register(sc->cid, CRYPTO_AES_CBC, 0, 0); 97 crypto_register(sc->cid, CRYPTO_AES_XTS, 0, 0); 98 return (0); 99 } 100 101 static int 102 aesni_detach(device_t dev) 103 { 104 struct aesni_softc *sc; 105 struct aesni_session *ses; 106 107 sc = device_get_softc(dev); 108 spin_lock(&sc->lock); 109 TAILQ_FOREACH(ses, &sc->sessions, next) { 110 if (ses->used) { 111 spin_unlock(&sc->lock); 112 device_printf(dev, 113 "Cannot detach, sessions still active.\n"); 114 return (EBUSY); 115 } 116 } 117 while ((ses = TAILQ_FIRST(&sc->sessions)) != NULL) { 118 TAILQ_REMOVE(&sc->sessions, ses, next); 119 kfree(ses, M_AESNI); 120 } 121 spin_unlock(&sc->lock); 122 spin_uninit(&sc->lock); 123 crypto_unregister_all(sc->cid); 124 return (0); 125 } 126 127 static int 128 aesni_newsession(device_t dev, uint32_t *sidp, struct cryptoini *cri) 129 { 130 struct aesni_softc *sc; 131 struct aesni_session *ses; 132 struct cryptoini *encini; 133 int error; 134 135 if (sidp == NULL || cri == NULL) 136 return (EINVAL); 137 138 sc = device_get_softc(dev); 139 ses = NULL; 140 encini = NULL; 141 for (; cri != NULL; cri = cri->cri_next) { 142 switch (cri->cri_alg) { 143 case CRYPTO_AES_CBC: 144 case CRYPTO_AES_XTS: 145 if (encini != NULL) 146 return (EINVAL); 147 encini = cri; 148 break; 149 default: 150 return (EINVAL); 151 } 152 } 153 if (encini == NULL) 154 return (EINVAL); 155 156 spin_lock(&sc->lock); 157 /* 158 * Free sessions goes first, so if first session is used, we need to 159 * allocate one. 160 */ 161 ses = TAILQ_FIRST(&sc->sessions); 162 if (ses == NULL || ses->used) { 163 /* 164 * Release the spinlock here, since the following 165 * kmalloc(M_WAITOK) may block. kmalloc(M_NOWAIT) 166 * is not acceptable on this code path. 167 */ 168 spin_unlock(&sc->lock); 169 170 /* 171 * aesni_session must be at least AESNI_ALIGN aligned. To 172 * make sure about that we always do a power-of-2 allocation. 173 */ 174 ses = kmalloc(sizeof(*ses), M_AESNI, 175 M_WAITOK | M_ZERO | M_POWEROF2); 176 if ((uintptr_t)ses & (AESNI_ALIGN - 1)) { 177 panic("aesni: ses %p is not %d aligned", 178 ses, AESNI_ALIGN); 179 } 180 181 spin_lock(&sc->lock); 182 ses->id = sc->sid++; 183 } else { 184 TAILQ_REMOVE(&sc->sessions, ses, next); 185 } 186 ses->used = 1; 187 TAILQ_INSERT_TAIL(&sc->sessions, ses, next); 188 spin_unlock(&sc->lock); 189 ses->algo = encini->cri_alg; 190 191 error = aesni_cipher_setup(ses, encini); 192 if (error != 0) { 193 spin_lock(&sc->lock); 194 aesni_freesession_locked(sc, ses); 195 spin_unlock(&sc->lock); 196 return (error); 197 } 198 199 *sidp = ses->id; 200 return (0); 201 } 202 203 static void 204 aesni_freesession_locked(struct aesni_softc *sc, struct aesni_session *ses) 205 { 206 uint32_t sid; 207 208 sid = ses->id; 209 TAILQ_REMOVE(&sc->sessions, ses, next); 210 211 bzero(ses, sizeof(*ses)); 212 ses->id = sid; 213 TAILQ_INSERT_HEAD(&sc->sessions, ses, next); 214 } 215 216 static int 217 aesni_freesession(device_t dev, uint64_t tid) 218 { 219 struct aesni_softc *sc; 220 struct aesni_session *ses; 221 uint32_t sid; 222 223 sc = device_get_softc(dev); 224 sid = ((uint32_t)tid) & 0xffffffff; 225 spin_lock(&sc->lock); 226 TAILQ_FOREACH_REVERSE(ses, &sc->sessions, aesni_sessions_head, next) { 227 if (ses->id == sid) 228 break; 229 } 230 if (ses == NULL) { 231 spin_unlock(&sc->lock); 232 return (EINVAL); 233 } 234 aesni_freesession_locked(sc, ses); 235 spin_unlock(&sc->lock); 236 return (0); 237 } 238 239 static int 240 aesni_process(device_t dev, struct cryptop *crp, int hint __unused) 241 { 242 struct aesni_softc *sc = device_get_softc(dev); 243 struct aesni_session *ses = NULL; 244 struct cryptodesc *crd, *enccrd; 245 int error; 246 247 error = 0; 248 enccrd = NULL; 249 250 /* Sanity check. */ 251 if (crp == NULL) 252 return (EINVAL); 253 254 if (crp->crp_callback == NULL || crp->crp_desc == NULL) { 255 error = EINVAL; 256 goto out; 257 } 258 259 for (crd = crp->crp_desc; crd != NULL; crd = crd->crd_next) { 260 switch (crd->crd_alg) { 261 case CRYPTO_AES_CBC: 262 case CRYPTO_AES_XTS: 263 if (enccrd != NULL) { 264 error = EINVAL; 265 goto out; 266 } 267 enccrd = crd; 268 break; 269 default: 270 return (EINVAL); 271 } 272 } 273 if (enccrd == NULL || (enccrd->crd_len % AES_BLOCK_LEN) != 0) { 274 error = EINVAL; 275 goto out; 276 } 277 278 spin_lock(&sc->lock); /* XXX: was rd lock */ 279 TAILQ_FOREACH_REVERSE(ses, &sc->sessions, aesni_sessions_head, next) { 280 if (ses->id == (crp->crp_sid & 0xffffffff)) 281 break; 282 } 283 spin_unlock(&sc->lock); /* XXX: was rd lock */ 284 if (ses == NULL) { 285 error = EINVAL; 286 goto out; 287 } 288 289 error = aesni_cipher_process(ses, enccrd, crp); 290 if (error != 0) 291 goto out; 292 293 out: 294 crp->crp_etype = error; 295 crypto_done(crp); 296 return (error); 297 } 298 299 uint8_t * 300 aesni_cipher_alloc(struct cryptodesc *enccrd, struct cryptop *crp, 301 int *allocated) 302 { 303 struct uio *uio; 304 struct iovec *iov; 305 uint8_t *addr; 306 307 if (crp->crp_flags & CRYPTO_F_IMBUF) 308 goto alloc; 309 else if (crp->crp_flags & CRYPTO_F_IOV) { 310 uio = (struct uio *)crp->crp_buf; 311 if (uio->uio_iovcnt != 1) 312 goto alloc; 313 iov = uio->uio_iov; 314 addr = (u_char *)iov->iov_base + enccrd->crd_skip; 315 } else 316 addr = (u_char *)crp->crp_buf; 317 *allocated = 0; 318 return (addr); 319 320 alloc: 321 addr = kmalloc(enccrd->crd_len, M_AESNI, M_NOWAIT); 322 if (addr != NULL) { 323 *allocated = 1; 324 crypto_copydata(crp->crp_flags, crp->crp_buf, enccrd->crd_skip, 325 enccrd->crd_len, addr); 326 } else 327 *allocated = 0; 328 return (addr); 329 } 330 331 static device_method_t aesni_methods[] = { 332 DEVMETHOD(device_identify, aesni_identify), 333 DEVMETHOD(device_probe, aesni_probe), 334 DEVMETHOD(device_attach, aesni_attach), 335 DEVMETHOD(device_detach, aesni_detach), 336 337 DEVMETHOD(cryptodev_newsession, aesni_newsession), 338 DEVMETHOD(cryptodev_freesession, aesni_freesession), 339 DEVMETHOD(cryptodev_process, aesni_process), 340 341 DEVMETHOD_END 342 }; 343 344 static driver_t aesni_driver = { 345 "aesni", 346 aesni_methods, 347 sizeof(struct aesni_softc), 348 }; 349 static devclass_t aesni_devclass; 350 351 DRIVER_MODULE(aesni, nexus, aesni_driver, aesni_devclass, NULL, NULL); 352 MODULE_VERSION(aesni, 1); 353 MODULE_DEPEND(aesni, crypto, 1, 1, 1); 354