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sys/opencrypto/cryptodev.c
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1 /* $FreeBSD: src/sys/opencrypto/cryptodev.c,v 1.41 2009/09/04 09:48:18 pjd Exp $ */ 2 /* $OpenBSD: cryptodev.c,v 1.52 2002/06/19 07:22:46 deraadt Exp $ */ 3 4 /*- 5 * Copyright (c) 2001 Theo de Raadt 6 * Copyright (c) 2002-2006 Sam Leffler, Errno Consulting 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. The name of the author may not be used to endorse or promote products 18 * derived from this software without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 21 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 22 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 23 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 24 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 25 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 29 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 30 * 31 * Effort sponsored in part by the Defense Advanced Research Projects 32 * Agency (DARPA) and Air Force Research Laboratory, Air Force 33 * Materiel Command, USAF, under agreement number F30602-01-2-0537. 34 */ 35 36 #include <sys/param.h> 37 #include <sys/systm.h> 38 #include <sys/malloc.h> 39 #include <sys/device.h> 40 #include <sys/mbuf.h> 41 #include <sys/lock.h> 42 #include <sys/sysctl.h> 43 #include <sys/file.h> 44 #include <sys/filedesc.h> 45 #include <sys/errno.h> 46 #include <sys/uio.h> 47 #include <sys/random.h> 48 #include <sys/conf.h> 49 #include <sys/module.h> 50 #include <sys/kernel.h> 51 #include <sys/fcntl.h> 52 #include <sys/proc.h> 53 54 #include <sys/file2.h> 55 #include <sys/thread2.h> 56 #include <sys/mplock2.h> 57 58 #include <opencrypto/cryptodev.h> 59 #include <opencrypto/xform.h> 60 61 struct csession { 62 TAILQ_ENTRY(csession) next; 63 u_int64_t sid; 64 u_int32_t ses; 65 struct lock lock; 66 67 u_int32_t cipher; 68 struct enc_xform *txform; 69 u_int32_t mac; 70 struct auth_hash *thash; 71 72 caddr_t key; 73 int keylen; 74 u_char tmp_iv[EALG_MAX_BLOCK_LEN]; 75 76 caddr_t mackey; 77 int mackeylen; 78 79 struct iovec iovec; 80 struct uio uio; 81 int error; 82 }; 83 84 struct fcrypt { 85 TAILQ_HEAD(csessionlist, csession) csessions; 86 int sesn; 87 }; 88 89 static int cryptof_rw(struct file *fp, struct uio *uio, 90 struct ucred *cred, int flags); 91 static int cryptof_ioctl(struct file *, u_long, caddr_t, 92 struct ucred *, struct sysmsg *); 93 static int cryptof_kqfilter(struct file *, struct knote *); 94 static int cryptof_stat(struct file *, struct stat *, struct ucred *); 95 static int cryptof_close(struct file *); 96 97 static struct fileops cryptofops = { 98 .fo_read = cryptof_rw, 99 .fo_write = cryptof_rw, 100 .fo_ioctl = cryptof_ioctl, 101 .fo_kqfilter = cryptof_kqfilter, 102 .fo_stat = cryptof_stat, 103 .fo_close = cryptof_close, 104 .fo_shutdown = nofo_shutdown 105 }; 106 107 static struct csession *csefind(struct fcrypt *, u_int); 108 static int csedelete(struct fcrypt *, struct csession *); 109 static struct csession *cseadd(struct fcrypt *, struct csession *); 110 static struct csession *csecreate(struct fcrypt *, u_int64_t, caddr_t, 111 u_int64_t, caddr_t, u_int64_t, u_int32_t, u_int32_t, struct enc_xform *, 112 struct auth_hash *); 113 static int csefree(struct csession *); 114 115 static int cryptodev_op(struct csession *, struct crypt_op *, struct ucred *); 116 static int cryptodev_key(struct crypt_kop *); 117 static int cryptodev_find(struct crypt_find_op *); 118 119 static int 120 cryptof_rw( 121 struct file *fp, 122 struct uio *uio, 123 struct ucred *active_cred, 124 int flags) 125 { 126 return (EIO); 127 } 128 129 /* 130 * Check a crypto identifier to see if it requested 131 * a software device/driver. This can be done either 132 * by device name/class or through search constraints. 133 */ 134 static int 135 checkforsoftware(int crid) 136 { 137 if (crid & CRYPTOCAP_F_SOFTWARE) 138 return EINVAL; /* XXX */ 139 if ((crid & CRYPTOCAP_F_HARDWARE) == 0 && 140 (crypto_getcaps(crid) & CRYPTOCAP_F_HARDWARE) == 0) 141 return EINVAL; /* XXX */ 142 return 0; 143 } 144 145 /* ARGSUSED */ 146 static int 147 cryptof_ioctl(struct file *fp, u_long cmd, caddr_t data, 148 struct ucred *cred, struct sysmsg *msg) 149 { 150 #define SES2(p) ((struct session2_op *)p) 151 struct cryptoini cria, crie; 152 struct fcrypt *fcr = fp->f_data; 153 struct csession *cse; 154 struct session_op *sop; 155 struct crypt_op *cop; 156 struct enc_xform *txform = NULL; 157 struct auth_hash *thash = NULL; 158 struct crypt_kop *kop; 159 u_int64_t sid; 160 u_int32_t ses; 161 int error = 0, crid; 162 163 switch (cmd) { 164 case CIOCGSESSION: 165 case CIOCGSESSION2: 166 sop = (struct session_op *)data; 167 switch (sop->cipher) { 168 case 0: 169 break; 170 case CRYPTO_DES_CBC: 171 txform = &enc_xform_des; 172 break; 173 case CRYPTO_3DES_CBC: 174 txform = &enc_xform_3des; 175 break; 176 case CRYPTO_BLF_CBC: 177 txform = &enc_xform_blf; 178 break; 179 case CRYPTO_CAST_CBC: 180 txform = &enc_xform_cast5; 181 break; 182 case CRYPTO_SKIPJACK_CBC: 183 txform = &enc_xform_skipjack; 184 break; 185 case CRYPTO_AES_CBC: 186 txform = &enc_xform_rijndael128; 187 break; 188 case CRYPTO_AES_XTS: 189 txform = &enc_xform_aes_xts; 190 break; 191 case CRYPTO_AES_CTR: 192 txform = &enc_xform_aes_ctr; 193 break; 194 case CRYPTO_NULL_CBC: 195 txform = &enc_xform_null; 196 break; 197 case CRYPTO_ARC4: 198 txform = &enc_xform_arc4; 199 break; 200 case CRYPTO_CAMELLIA_CBC: 201 txform = &enc_xform_camellia; 202 break; 203 case CRYPTO_TWOFISH_CBC: 204 txform = &enc_xform_twofish; 205 break; 206 case CRYPTO_SERPENT_CBC: 207 txform = &enc_xform_serpent; 208 break; 209 case CRYPTO_TWOFISH_XTS: 210 txform = &enc_xform_twofish_xts; 211 break; 212 case CRYPTO_SERPENT_XTS: 213 txform = &enc_xform_serpent_xts; 214 break; 215 default: 216 return (EINVAL); 217 } 218 219 switch (sop->mac) { 220 case 0: 221 break; 222 case CRYPTO_MD5_HMAC: 223 thash = &auth_hash_hmac_md5; 224 break; 225 case CRYPTO_SHA1_HMAC: 226 thash = &auth_hash_hmac_sha1; 227 break; 228 case CRYPTO_SHA2_256_HMAC: 229 thash = &auth_hash_hmac_sha2_256; 230 break; 231 case CRYPTO_SHA2_384_HMAC: 232 thash = &auth_hash_hmac_sha2_384; 233 break; 234 case CRYPTO_SHA2_512_HMAC: 235 thash = &auth_hash_hmac_sha2_512; 236 break; 237 case CRYPTO_RIPEMD160_HMAC: 238 thash = &auth_hash_hmac_ripemd_160; 239 break; 240 #ifdef notdef 241 case CRYPTO_MD5: 242 thash = &auth_hash_md5; 243 break; 244 case CRYPTO_SHA1: 245 thash = &auth_hash_sha1; 246 break; 247 #endif 248 case CRYPTO_NULL_HMAC: 249 thash = &auth_hash_null; 250 break; 251 default: 252 return (EINVAL); 253 } 254 255 bzero(&crie, sizeof(crie)); 256 bzero(&cria, sizeof(cria)); 257 258 if (txform) { 259 crie.cri_alg = txform->type; 260 crie.cri_klen = sop->keylen * 8; 261 if (sop->keylen > txform->maxkey || 262 sop->keylen < txform->minkey) { 263 error = EINVAL; 264 goto bail; 265 } 266 267 crie.cri_key = kmalloc(crie.cri_klen / 8, 268 M_XDATA, M_WAITOK); 269 if ((error = copyin(sop->key, crie.cri_key, 270 crie.cri_klen / 8))) 271 goto bail; 272 if (thash) 273 crie.cri_next = &cria; 274 } 275 276 if (thash) { 277 cria.cri_alg = thash->type; 278 cria.cri_klen = sop->mackeylen * 8; 279 if (sop->mackeylen != thash->keysize) { 280 error = EINVAL; 281 goto bail; 282 } 283 284 if (cria.cri_klen) { 285 cria.cri_key = kmalloc(cria.cri_klen / 8, 286 M_XDATA, M_WAITOK); 287 if ((error = copyin(sop->mackey, cria.cri_key, 288 cria.cri_klen / 8))) 289 goto bail; 290 } 291 } 292 293 /* NB: CIOGSESSION2 has the crid */ 294 if (cmd == CIOCGSESSION2) { 295 crid = SES2(sop)->crid; 296 error = checkforsoftware(crid); 297 if (error) 298 goto bail; 299 } else { 300 crid = CRYPTOCAP_F_HARDWARE; 301 if (crypto_devallowsoft) 302 crid |= CRYPTOCAP_F_SOFTWARE; 303 } 304 error = crypto_newsession(&sid, (txform ? &crie : &cria), crid); 305 if (error) 306 goto bail; 307 308 cse = csecreate(fcr, sid, crie.cri_key, crie.cri_klen, 309 cria.cri_key, cria.cri_klen, sop->cipher, sop->mac, txform, 310 thash); 311 312 if (cse == NULL) { 313 crypto_freesession(sid); 314 error = EINVAL; 315 goto bail; 316 } 317 sop->ses = cse->ses; 318 if (cmd == CIOCGSESSION2) { 319 /* return hardware/driver id */ 320 SES2(sop)->crid = CRYPTO_SESID2HID(cse->sid); 321 } 322 bail: 323 if (error) { 324 if (crie.cri_key) { 325 bzero(crie.cri_key, crie.cri_klen / 8); 326 kfree(crie.cri_key, M_XDATA); 327 } 328 if (cria.cri_key) { 329 bzero(cria.cri_key, cria.cri_klen / 8); 330 kfree(cria.cri_key, M_XDATA); 331 } 332 } 333 break; 334 case CIOCFSESSION: 335 ses = *(u_int32_t *)data; 336 cse = csefind(fcr, ses); 337 if (cse == NULL) 338 return (EINVAL); 339 csedelete(fcr, cse); 340 error = csefree(cse); 341 break; 342 case CIOCCRYPT: 343 cop = (struct crypt_op *)data; 344 cse = csefind(fcr, cop->ses); 345 if (cse == NULL) 346 return (EINVAL); 347 error = cryptodev_op(cse, cop, cred); 348 break; 349 case CIOCKEY: 350 case CIOCKEY2: 351 if (!crypto_userasymcrypto) 352 return (EPERM); /* XXX compat? */ 353 get_mplock(); 354 kop = (struct crypt_kop *)data; 355 if (cmd == CIOCKEY) { 356 /* NB: crypto core enforces s/w driver use */ 357 kop->crk_crid = 358 CRYPTOCAP_F_HARDWARE | CRYPTOCAP_F_SOFTWARE; 359 } 360 error = cryptodev_key(kop); 361 rel_mplock(); 362 break; 363 case CIOCASYMFEAT: 364 if (!crypto_userasymcrypto) { 365 /* 366 * NB: if user asym crypto operations are 367 * not permitted return "no algorithms" 368 * so well-behaved applications will just 369 * fallback to doing them in software. 370 */ 371 *(int *)data = 0; 372 } else 373 error = crypto_getfeat((int *)data); 374 break; 375 case CIOCFINDDEV: 376 error = cryptodev_find((struct crypt_find_op *)data); 377 break; 378 default: 379 error = EINVAL; 380 break; 381 } 382 return (error); 383 #undef SES2 384 } 385 386 static int cryptodev_cb(void *); 387 388 389 static int 390 cryptodev_op(struct csession *cse, struct crypt_op *cop, 391 struct ucred *active_cred) 392 { 393 struct cryptop *crp = NULL; 394 struct cryptodesc *crde = NULL, *crda = NULL; 395 int error; 396 397 if (cop->len > 256*1024-4) 398 return (E2BIG); 399 400 if (cse->txform) { 401 if (cop->len == 0 || (cop->len % cse->txform->blocksize) != 0) 402 return (EINVAL); 403 } 404 405 bzero(&cse->uio, sizeof(cse->uio)); 406 cse->uio.uio_iov = &cse->iovec; 407 cse->uio.uio_iovcnt = 1; 408 cse->uio.uio_offset = 0; 409 cse->uio.uio_resid = cop->len; 410 cse->uio.uio_segflg = UIO_SYSSPACE; 411 cse->uio.uio_rw = UIO_WRITE; 412 /* XXX: not sure, was td, now curthread? */ 413 cse->uio.uio_td = curthread; 414 cse->uio.uio_iov[0].iov_len = cop->len; 415 if (cse->thash) { 416 cse->uio.uio_iov[0].iov_len += cse->thash->hashsize; 417 cse->uio.uio_resid += cse->thash->hashsize; 418 } 419 cse->uio.uio_iov[0].iov_base = kmalloc(cse->uio.uio_iov[0].iov_len, 420 M_XDATA, M_WAITOK); 421 422 crp = crypto_getreq((cse->txform != NULL) + (cse->thash != NULL)); 423 if (crp == NULL) { 424 error = ENOMEM; 425 goto bail; 426 } 427 428 if (cse->thash) { 429 crda = crp->crp_desc; 430 if (cse->txform) 431 crde = crda->crd_next; 432 } else { 433 if (cse->txform) 434 crde = crp->crp_desc; 435 else { 436 error = EINVAL; 437 goto bail; 438 } 439 } 440 441 if ((error = copyin(cop->src, cse->uio.uio_iov[0].iov_base, cop->len))) 442 goto bail; 443 444 if (crda) { 445 crda->crd_skip = 0; 446 crda->crd_len = cop->len; 447 crda->crd_inject = cop->len; 448 449 crda->crd_alg = cse->mac; 450 crda->crd_key = cse->mackey; 451 crda->crd_klen = cse->mackeylen * 8; 452 } 453 454 if (crde) { 455 if (cop->op == COP_ENCRYPT) 456 crde->crd_flags |= CRD_F_ENCRYPT; 457 else 458 crde->crd_flags &= ~CRD_F_ENCRYPT; 459 crde->crd_len = cop->len; 460 crde->crd_inject = 0; 461 462 crde->crd_alg = cse->cipher; 463 crde->crd_key = cse->key; 464 crde->crd_klen = cse->keylen * 8; 465 } 466 467 crp->crp_ilen = cop->len; 468 crp->crp_flags = CRYPTO_F_IOV | CRYPTO_F_CBIMM 469 | (cop->flags & COP_F_BATCH); 470 crp->crp_buf = (caddr_t)&cse->uio; 471 crp->crp_callback = (int (*) (struct cryptop *)) cryptodev_cb; 472 crp->crp_sid = cse->sid; 473 crp->crp_opaque = (void *)cse; 474 475 if (cop->iv) { 476 if (crde == NULL) { 477 error = EINVAL; 478 goto bail; 479 } 480 if (cse->cipher == CRYPTO_ARC4) { /* XXX use flag? */ 481 error = EINVAL; 482 goto bail; 483 } 484 if ((error = copyin(cop->iv, cse->tmp_iv, cse->txform->blocksize))) 485 goto bail; 486 bcopy(cse->tmp_iv, crde->crd_iv, cse->txform->blocksize); 487 crde->crd_flags |= CRD_F_IV_EXPLICIT | CRD_F_IV_PRESENT; 488 crde->crd_skip = 0; 489 } else if (cse->cipher == CRYPTO_ARC4) { /* XXX use flag? */ 490 crde->crd_skip = 0; 491 } else if (crde) { 492 crde->crd_flags |= CRD_F_IV_PRESENT; 493 crde->crd_skip = cse->txform->blocksize; 494 crde->crd_len -= cse->txform->blocksize; 495 } 496 497 if (cop->mac && crda == NULL) { 498 error = EINVAL; 499 goto bail; 500 } 501 502 again: 503 /* 504 * Let the dispatch run unlocked, then, interlock against the 505 * callback before checking if the operation completed and going 506 * to sleep. This insures drivers don't inherit our lock which 507 * results in a lock order reversal between crypto_dispatch forced 508 * entry and the crypto_done callback into us. 509 */ 510 error = crypto_dispatch(crp); 511 lockmgr(&cse->lock, LK_EXCLUSIVE); 512 if (error == 0 && (crp->crp_flags & CRYPTO_F_DONE) == 0) 513 error = lksleep(crp, &cse->lock, 0, "crydev", 0); 514 lockmgr(&cse->lock, LK_RELEASE); 515 516 if (error != 0) 517 goto bail; 518 519 if (crp->crp_etype == EAGAIN) { 520 crp->crp_etype = 0; 521 crp->crp_flags &= ~CRYPTO_F_DONE; 522 goto again; 523 } 524 525 if (crp->crp_etype != 0) { 526 error = crp->crp_etype; 527 goto bail; 528 } 529 530 if (cse->error) { 531 error = cse->error; 532 goto bail; 533 } 534 535 if (cop->dst && 536 (error = copyout(cse->uio.uio_iov[0].iov_base, cop->dst, cop->len))) 537 goto bail; 538 539 if (cop->mac && 540 (error = copyout((caddr_t)cse->uio.uio_iov[0].iov_base + cop->len, 541 cop->mac, cse->thash->hashsize))) 542 goto bail; 543 544 bail: 545 if (crp) 546 crypto_freereq(crp); 547 if (cse->uio.uio_iov[0].iov_base) 548 kfree(cse->uio.uio_iov[0].iov_base, M_XDATA); 549 550 return (error); 551 } 552 553 static int 554 cryptodev_cb(void *op) 555 { 556 struct cryptop *crp = (struct cryptop *) op; 557 struct csession *cse = (struct csession *)crp->crp_opaque; 558 559 lockmgr(&cse->lock, LK_EXCLUSIVE); 560 cse->error = crp->crp_etype; 561 wakeup_one(crp); 562 lockmgr(&cse->lock, LK_RELEASE); 563 return (0); 564 } 565 566 static int 567 cryptodevkey_cb(void *op) 568 { 569 struct cryptkop *krp = (struct cryptkop *) op; 570 571 wakeup_one(krp); 572 return (0); 573 } 574 575 static int 576 cryptodev_key(struct crypt_kop *kop) 577 { 578 struct cryptkop *krp = NULL; 579 int error = EINVAL; 580 int in, out, size, i; 581 582 if (kop->crk_iparams + kop->crk_oparams > CRK_MAXPARAM) { 583 return (EFBIG); 584 } 585 586 in = kop->crk_iparams; 587 out = kop->crk_oparams; 588 switch (kop->crk_op) { 589 case CRK_MOD_EXP: 590 if (in == 3 && out == 1) 591 break; 592 return (EINVAL); 593 case CRK_MOD_EXP_CRT: 594 if (in == 6 && out == 1) 595 break; 596 return (EINVAL); 597 case CRK_DSA_SIGN: 598 if (in == 5 && out == 2) 599 break; 600 return (EINVAL); 601 case CRK_DSA_VERIFY: 602 if (in == 7 && out == 0) 603 break; 604 return (EINVAL); 605 case CRK_DH_COMPUTE_KEY: 606 if (in == 3 && out == 1) 607 break; 608 return (EINVAL); 609 default: 610 return (EINVAL); 611 } 612 613 krp = (struct cryptkop *)kmalloc(sizeof *krp, M_XDATA, M_WAITOK | M_ZERO); 614 krp->krp_op = kop->crk_op; 615 krp->krp_status = kop->crk_status; 616 krp->krp_iparams = kop->crk_iparams; 617 krp->krp_oparams = kop->crk_oparams; 618 krp->krp_crid = kop->crk_crid; 619 krp->krp_status = 0; 620 krp->krp_callback = (int (*) (struct cryptkop *)) cryptodevkey_cb; 621 622 for (i = 0; i < CRK_MAXPARAM; i++) { 623 if (kop->crk_param[i].crp_nbits > 65536) 624 /* Limit is the same as in OpenBSD */ 625 goto fail; 626 krp->krp_param[i].crp_nbits = kop->crk_param[i].crp_nbits; 627 } 628 for (i = 0; i < krp->krp_iparams + krp->krp_oparams; i++) { 629 size = (krp->krp_param[i].crp_nbits + 7) / 8; 630 if (size == 0) 631 continue; 632 krp->krp_param[i].crp_p = kmalloc(size, M_XDATA, M_WAITOK); 633 if (i >= krp->krp_iparams) 634 continue; 635 error = copyin(kop->crk_param[i].crp_p, krp->krp_param[i].crp_p, size); 636 if (error) 637 goto fail; 638 } 639 640 error = crypto_kdispatch(krp); 641 if (error) 642 goto fail; 643 error = tsleep(krp, 0, "crydev", 0); 644 if (error) { 645 /* XXX can this happen? if so, how do we recover? */ 646 goto fail; 647 } 648 649 kop->crk_crid = krp->krp_crid; /* device that did the work */ 650 if (krp->krp_status != 0) { 651 error = krp->krp_status; 652 goto fail; 653 } 654 655 for (i = krp->krp_iparams; i < krp->krp_iparams + krp->krp_oparams; i++) { 656 size = (krp->krp_param[i].crp_nbits + 7) / 8; 657 if (size == 0) 658 continue; 659 error = copyout(krp->krp_param[i].crp_p, kop->crk_param[i].crp_p, size); 660 if (error) 661 goto fail; 662 } 663 664 fail: 665 if (krp) { 666 kop->crk_status = krp->krp_status; 667 for (i = 0; i < CRK_MAXPARAM; i++) { 668 if (krp->krp_param[i].crp_p) { 669 bzero(krp->krp_param[i].crp_p, 670 (krp->krp_param[i].crp_nbits + 7) / 8); 671 kfree(krp->krp_param[i].crp_p, M_XDATA); 672 } 673 } 674 kfree(krp, M_XDATA); 675 } 676 return (error); 677 } 678 679 static int 680 cryptodev_find(struct crypt_find_op *find) 681 { 682 device_t dev; 683 684 if (find->crid != -1) { 685 dev = crypto_find_device_byhid(find->crid); 686 if (dev == NULL) 687 return (ENOENT); 688 strlcpy(find->name, device_get_nameunit(dev), 689 sizeof(find->name)); 690 } else { 691 find->crid = crypto_find_driver(find->name); 692 if (find->crid == -1) 693 return (ENOENT); 694 } 695 return (0); 696 } 697 698 /* 699 * MPSAFE 700 */ 701 static int 702 cryptof_kqfilter(struct file *fp, struct knote *kn) 703 { 704 705 return (0); 706 } 707 708 /* 709 * MPSAFE 710 */ 711 static int 712 cryptof_stat(struct file *fp, struct stat *sb, struct ucred *cred) 713 { 714 return (EOPNOTSUPP); 715 } 716 717 /* 718 * MPALMOSTSAFE - acquires mplock 719 */ 720 static int 721 cryptof_close(struct file *fp) 722 { 723 struct fcrypt *fcr = fp->f_data; 724 struct csession *cse; 725 726 get_mplock(); 727 fcr = (struct fcrypt *)fp->f_data; 728 while ((cse = TAILQ_FIRST(&fcr->csessions))) { 729 TAILQ_REMOVE(&fcr->csessions, cse, next); 730 (void)csefree(cse); 731 } 732 fp->f_data = NULL; 733 rel_mplock(); 734 735 kfree(fcr, M_XDATA); 736 return (0); 737 } 738 739 static struct csession * 740 csefind(struct fcrypt *fcr, u_int ses) 741 { 742 struct csession *cse; 743 744 TAILQ_FOREACH(cse, &fcr->csessions, next) 745 if (cse->ses == ses) 746 return (cse); 747 return (NULL); 748 } 749 750 static int 751 csedelete(struct fcrypt *fcr, struct csession *cse_del) 752 { 753 struct csession *cse; 754 755 TAILQ_FOREACH(cse, &fcr->csessions, next) { 756 if (cse == cse_del) { 757 TAILQ_REMOVE(&fcr->csessions, cse, next); 758 return (1); 759 } 760 } 761 return (0); 762 } 763 764 static struct csession * 765 cseadd(struct fcrypt *fcr, struct csession *cse) 766 { 767 TAILQ_INSERT_TAIL(&fcr->csessions, cse, next); 768 cse->ses = fcr->sesn++; 769 return (cse); 770 } 771 772 struct csession * 773 csecreate(struct fcrypt *fcr, u_int64_t sid, caddr_t key, u_int64_t keylen, 774 caddr_t mackey, u_int64_t mackeylen, u_int32_t cipher, u_int32_t mac, 775 struct enc_xform *txform, struct auth_hash *thash) 776 { 777 struct csession *cse; 778 779 cse = kmalloc(sizeof(struct csession), M_XDATA, M_WAITOK | M_ZERO); 780 lockinit(&cse->lock, "cryptodev", 0, LK_CANRECURSE); 781 cse->key = key; 782 cse->keylen = keylen/8; 783 cse->mackey = mackey; 784 cse->mackeylen = mackeylen/8; 785 cse->sid = sid; 786 cse->cipher = cipher; 787 cse->mac = mac; 788 cse->txform = txform; 789 cse->thash = thash; 790 cseadd(fcr, cse); 791 return (cse); 792 } 793 794 static int 795 csefree(struct csession *cse) 796 { 797 int error; 798 799 error = crypto_freesession(cse->sid); 800 lockuninit(&cse->lock); 801 if (cse->key) 802 kfree(cse->key, M_XDATA); 803 if (cse->mackey) 804 kfree(cse->mackey, M_XDATA); 805 kfree(cse, M_XDATA); 806 return (error); 807 } 808 809 static int 810 cryptoopen(struct dev_open_args *ap) 811 { 812 return (0); 813 } 814 815 static int 816 cryptoread(struct dev_read_args *ap) 817 { 818 return (EIO); 819 } 820 821 static int 822 cryptowrite(struct dev_write_args *ap) 823 { 824 return (EIO); 825 } 826 827 static int 828 cryptoioctl(struct dev_ioctl_args *ap) 829 { 830 struct thread *td = curthread; 831 struct file *f; 832 struct fcrypt *fcr; 833 int fd, error; 834 835 switch (ap->a_cmd) { 836 case CRIOGET: 837 fcr = kmalloc(sizeof(struct fcrypt), M_XDATA, M_WAITOK); 838 TAILQ_INIT(&fcr->csessions); 839 fcr->sesn = 0; 840 841 KKASSERT(td->td_lwp); 842 error = falloc(td->td_lwp, &f, &fd); 843 844 if (error) { 845 kfree(fcr, M_XDATA); 846 return (error); 847 } 848 /* falloc automatically provides an extra reference to 'f'. */ 849 f->f_flag = FREAD | FWRITE; 850 f->f_type = DTYPE_CRYPTO; 851 f->f_ops = &cryptofops; 852 f->f_data = fcr; 853 fsetfd(td->td_proc->p_fd, f, fd); 854 *(u_int32_t *)ap->a_data = fd; 855 fdrop(f); 856 857 break; 858 case CRIOFINDDEV: 859 error = cryptodev_find((struct crypt_find_op *)ap->a_data); 860 break; 861 case CRIOASYMFEAT: 862 error = crypto_getfeat((int *)ap->a_data); 863 break; 864 default: 865 error = EINVAL; 866 break; 867 } 868 return (error); 869 } 870 871 static struct dev_ops crypto_ops = { 872 { "crypto", 0, D_MPSAFE }, 873 .d_open = cryptoopen, 874 .d_read = cryptoread, 875 .d_write = cryptowrite, 876 .d_ioctl = cryptoioctl, 877 }; 878 879 /* 880 * Initialization code, both for static and dynamic loading. 881 */ 882 static int 883 cryptodev_modevent(module_t mod, int type, void *unused) 884 { 885 switch (type) { 886 case MOD_LOAD: 887 if (bootverbose) 888 kprintf("crypto: <crypto device>\n"); 889 make_dev(&crypto_ops, 0, UID_ROOT, GID_WHEEL, 890 0666, "crypto"); 891 return 0; 892 case MOD_UNLOAD: 893 /*XXX disallow if active sessions */ 894 //dev_ops_remove(&crypto_ops, 0, 0); 895 dev_ops_remove_all(&crypto_ops); 896 return 0; 897 } 898 return EINVAL; 899 } 900 901 static moduledata_t cryptodev_mod = { 902 "cryptodev", 903 cryptodev_modevent, 904 0 905 }; 906 MODULE_VERSION(cryptodev, 1); 907 DECLARE_MODULE(cryptodev, cryptodev_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 908 MODULE_DEPEND(cryptodev, crypto, 1, 1, 1);
Cache object: 2f590fa5573d565cba0d95f98907014b
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