cryptodev.c revision 172474
1/* $OpenBSD: cryptodev.c,v 1.52 2002/06/19 07:22:46 deraadt Exp $ */ 2 3/*- 4 * Copyright (c) 2001 Theo de Raadt 5 * Copyright (c) 2002-2006 Sam Leffler, Errno Consulting 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. The name of the author may not be used to endorse or promote products 17 * derived from this software without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 21 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 22 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 24 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 28 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 * 30 * Effort sponsored in part by the Defense Advanced Research Projects 31 * Agency (DARPA) and Air Force Research Laboratory, Air Force 32 * Materiel Command, USAF, under agreement number F30602-01-2-0537. 33 */ 34 35#include <sys/cdefs.h> 36__FBSDID("$FreeBSD: head/sys/opencrypto/cryptodev.c 172474 2007-10-08 20:08:34Z kib $"); 37 38#include <sys/param.h> 39#include <sys/systm.h> 40#include <sys/malloc.h> 41#include <sys/mbuf.h> 42#include <sys/lock.h> 43#include <sys/mutex.h> 44#include <sys/sysctl.h> 45#include <sys/file.h> 46#include <sys/filedesc.h> 47#include <sys/errno.h> 48#include <sys/uio.h> 49#include <sys/random.h> 50#include <sys/conf.h> 51#include <sys/kernel.h> 52#include <sys/module.h> 53#include <sys/fcntl.h> 54#include <sys/bus.h> 55 56#include <opencrypto/cryptodev.h> 57#include <opencrypto/xform.h> 58 59struct csession { 60 TAILQ_ENTRY(csession) next; 61 u_int64_t sid; 62 u_int32_t ses; 63 struct mtx lock; /* for op submission */ 64 65 u_int32_t cipher; 66 struct enc_xform *txform; 67 u_int32_t mac; 68 struct auth_hash *thash; 69 70 caddr_t key; 71 int keylen; 72 u_char tmp_iv[EALG_MAX_BLOCK_LEN]; 73 74 caddr_t mackey; 75 int mackeylen; 76 77 struct iovec iovec; 78 struct uio uio; 79 int error; 80}; 81 82struct fcrypt { 83 TAILQ_HEAD(csessionlist, csession) csessions; 84 int sesn; 85}; 86 87static int cryptof_rw(struct file *fp, struct uio *uio, 88 struct ucred *cred, int flags, struct thread *); 89static int cryptof_ioctl(struct file *, u_long, void *, 90 struct ucred *, struct thread *); 91static int cryptof_poll(struct file *, int, struct ucred *, struct thread *); 92static int cryptof_kqfilter(struct file *, struct knote *); 93static int cryptof_stat(struct file *, struct stat *, 94 struct ucred *, struct thread *); 95static int cryptof_close(struct file *, struct thread *); 96 97static struct fileops cryptofops = { 98 .fo_read = cryptof_rw, 99 .fo_write = cryptof_rw, 100 .fo_ioctl = cryptof_ioctl, 101 .fo_poll = cryptof_poll, 102 .fo_kqfilter = cryptof_kqfilter, 103 .fo_stat = cryptof_stat, 104 .fo_close = cryptof_close 105}; 106 107static struct csession *csefind(struct fcrypt *, u_int); 108static int csedelete(struct fcrypt *, struct csession *); 109static struct csession *cseadd(struct fcrypt *, struct csession *); 110static 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 *); 113static int csefree(struct csession *); 114 115static int cryptodev_op(struct csession *, struct crypt_op *, 116 struct ucred *, struct thread *td); 117static int cryptodev_key(struct crypt_kop *); 118static int cryptodev_find(struct crypt_find_op *); 119 120static int 121cryptof_rw( 122 struct file *fp, 123 struct uio *uio, 124 struct ucred *active_cred, 125 int flags, 126 struct thread *td) 127{ 128 129 return (EIO); 130} 131 132/* 133 * Check a crypto identifier to see if it requested 134 * a software device/driver. This can be done either 135 * by device name/class or through search constraints. 136 */ 137static int 138checkforsoftware(int crid) 139{ 140 if (crid & CRYPTOCAP_F_SOFTWARE) 141 return EINVAL; /* XXX */ 142 if ((crid & CRYPTOCAP_F_HARDWARE) == 0 && 143 (crypto_getcaps(crid) & CRYPTOCAP_F_HARDWARE) == 0) 144 return EINVAL; /* XXX */ 145 return 0; 146} 147 148/* ARGSUSED */ 149static int 150cryptof_ioctl( 151 struct file *fp, 152 u_long cmd, 153 void *data, 154 struct ucred *active_cred, 155 struct thread *td) 156{ 157#define SES2(p) ((struct session2_op *)p) 158 struct cryptoini cria, crie; 159 struct fcrypt *fcr = fp->f_data; 160 struct csession *cse; 161 struct session_op *sop; 162 struct crypt_op *cop; 163 struct enc_xform *txform = NULL; 164 struct auth_hash *thash = NULL; 165 struct crypt_kop *kop; 166 u_int64_t sid; 167 u_int32_t ses; 168 int error = 0, crid; 169 170 switch (cmd) { 171 case CIOCGSESSION: 172 case CIOCGSESSION2: 173 sop = (struct session_op *)data; 174 switch (sop->cipher) { 175 case 0: 176 break; 177 case CRYPTO_DES_CBC: 178 txform = &enc_xform_des; 179 break; 180 case CRYPTO_3DES_CBC: 181 txform = &enc_xform_3des; 182 break; 183 case CRYPTO_BLF_CBC: 184 txform = &enc_xform_blf; 185 break; 186 case CRYPTO_CAST_CBC: 187 txform = &enc_xform_cast5; 188 break; 189 case CRYPTO_SKIPJACK_CBC: 190 txform = &enc_xform_skipjack; 191 break; 192 case CRYPTO_AES_CBC: 193 txform = &enc_xform_rijndael128; 194 break; 195 case CRYPTO_NULL_CBC: 196 txform = &enc_xform_null; 197 break; 198 case CRYPTO_ARC4: 199 txform = &enc_xform_arc4; 200 break; 201 case CRYPTO_CAMELLIA_CBC: 202 txform = &enc_xform_camellia; 203 break; 204 default: 205 return (EINVAL); 206 } 207 208 switch (sop->mac) { 209 case 0: 210 break; 211 case CRYPTO_MD5_HMAC: 212 thash = &auth_hash_hmac_md5; 213 break; 214 case CRYPTO_SHA1_HMAC: 215 thash = &auth_hash_hmac_sha1; 216 break; 217 case CRYPTO_SHA2_256_HMAC: 218 thash = &auth_hash_hmac_sha2_256; 219 break; 220 case CRYPTO_SHA2_384_HMAC: 221 thash = &auth_hash_hmac_sha2_384; 222 break; 223 case CRYPTO_SHA2_512_HMAC: 224 thash = &auth_hash_hmac_sha2_512; 225 break; 226 case CRYPTO_RIPEMD160_HMAC: 227 thash = &auth_hash_hmac_ripemd_160; 228 break; 229#ifdef notdef 230 case CRYPTO_MD5: 231 thash = &auth_hash_md5; 232 break; 233 case CRYPTO_SHA1: 234 thash = &auth_hash_sha1; 235 break; 236#endif 237 case CRYPTO_NULL_HMAC: 238 thash = &auth_hash_null; 239 break; 240 default: 241 return (EINVAL); 242 } 243 244 bzero(&crie, sizeof(crie)); 245 bzero(&cria, sizeof(cria)); 246 247 if (txform) { 248 crie.cri_alg = txform->type; 249 crie.cri_klen = sop->keylen * 8; 250 if (sop->keylen > txform->maxkey || 251 sop->keylen < txform->minkey) { 252 error = EINVAL; 253 goto bail; 254 } 255 256 MALLOC(crie.cri_key, u_int8_t *, 257 crie.cri_klen / 8, M_XDATA, M_WAITOK); 258 if ((error = copyin(sop->key, crie.cri_key, 259 crie.cri_klen / 8))) 260 goto bail; 261 if (thash) 262 crie.cri_next = &cria; 263 } 264 265 if (thash) { 266 cria.cri_alg = thash->type; 267 cria.cri_klen = sop->mackeylen * 8; 268 if (sop->mackeylen != thash->keysize) { 269 error = EINVAL; 270 goto bail; 271 } 272 273 if (cria.cri_klen) { 274 MALLOC(cria.cri_key, u_int8_t *, 275 cria.cri_klen / 8, M_XDATA, M_WAITOK); 276 if ((error = copyin(sop->mackey, cria.cri_key, 277 cria.cri_klen / 8))) 278 goto bail; 279 } 280 } 281 282 /* NB: CIOGSESSION2 has the crid */ 283 if (cmd == CIOCGSESSION2) { 284 crid = SES2(sop)->crid; 285 error = checkforsoftware(crid); 286 if (error) 287 goto bail; 288 } else 289 crid = CRYPTOCAP_F_HARDWARE; 290 error = crypto_newsession(&sid, (txform ? &crie : &cria), crid); 291 if (error) 292 goto bail; 293 294 cse = csecreate(fcr, sid, crie.cri_key, crie.cri_klen, 295 cria.cri_key, cria.cri_klen, sop->cipher, sop->mac, txform, 296 thash); 297 298 if (cse == NULL) { 299 crypto_freesession(sid); 300 error = EINVAL; 301 goto bail; 302 } 303 sop->ses = cse->ses; 304 if (cmd == CIOCGSESSION2) { 305 /* return hardware/driver id */ 306 SES2(sop)->crid = CRYPTO_SESID2HID(cse->sid); 307 } 308bail: 309 if (error) { 310 if (crie.cri_key) 311 FREE(crie.cri_key, M_XDATA); 312 if (cria.cri_key) 313 FREE(cria.cri_key, M_XDATA); 314 } 315 break; 316 case CIOCFSESSION: 317 ses = *(u_int32_t *)data; 318 cse = csefind(fcr, ses); 319 if (cse == NULL) 320 return (EINVAL); 321 csedelete(fcr, cse); 322 error = csefree(cse); 323 break; 324 case CIOCCRYPT: 325 cop = (struct crypt_op *)data; 326 cse = csefind(fcr, cop->ses); 327 if (cse == NULL) 328 return (EINVAL); 329 error = cryptodev_op(cse, cop, active_cred, td); 330 break; 331 case CIOCKEY: 332 case CIOCKEY2: 333 if (!crypto_userasymcrypto) 334 return (EPERM); /* XXX compat? */ 335 mtx_lock(&Giant); 336 kop = (struct crypt_kop *)data; 337 if (cmd == CIOCKEY) { 338 /* NB: crypto core enforces s/w driver use */ 339 kop->crk_crid = 340 CRYPTOCAP_F_HARDWARE | CRYPTOCAP_F_SOFTWARE; 341 } 342 error = cryptodev_key(kop); 343 mtx_unlock(&Giant); 344 break; 345 case CIOCASYMFEAT: 346 if (!crypto_userasymcrypto) { 347 /* 348 * NB: if user asym crypto operations are 349 * not permitted return "no algorithms" 350 * so well-behaved applications will just 351 * fallback to doing them in software. 352 */ 353 *(int *)data = 0; 354 } else 355 error = crypto_getfeat((int *)data); 356 break; 357 case CIOCFINDDEV: 358 error = cryptodev_find((struct crypt_find_op *)data); 359 break; 360 default: 361 error = EINVAL; 362 break; 363 } 364 return (error); 365#undef SES2 366} 367 368static int cryptodev_cb(void *); 369 370 371static int 372cryptodev_op( 373 struct csession *cse, 374 struct crypt_op *cop, 375 struct ucred *active_cred, 376 struct thread *td) 377{ 378 struct cryptop *crp = NULL; 379 struct cryptodesc *crde = NULL, *crda = NULL; 380 int error; 381 382 if (cop->len > 256*1024-4) 383 return (E2BIG); 384 385 if (cse->txform) { 386 if (cop->len == 0 || (cop->len % cse->txform->blocksize) != 0) 387 return (EINVAL); 388 } 389 390 cse->uio.uio_iov = &cse->iovec; 391 cse->uio.uio_iovcnt = 1; 392 cse->uio.uio_offset = 0; 393 cse->uio.uio_resid = cop->len; 394 cse->uio.uio_segflg = UIO_SYSSPACE; 395 cse->uio.uio_rw = UIO_WRITE; 396 cse->uio.uio_td = td; 397 cse->uio.uio_iov[0].iov_len = cop->len; 398 if (cse->thash) 399 cse->uio.uio_iov[0].iov_len += cse->thash->hashsize; 400 cse->uio.uio_iov[0].iov_base = malloc(cse->uio.uio_iov[0].iov_len, 401 M_XDATA, M_WAITOK); 402 403 crp = crypto_getreq((cse->txform != NULL) + (cse->thash != NULL)); 404 if (crp == NULL) { 405 error = ENOMEM; 406 goto bail; 407 } 408 409 if (cse->thash) { 410 crda = crp->crp_desc; 411 if (cse->txform) 412 crde = crda->crd_next; 413 } else { 414 if (cse->txform) 415 crde = crp->crp_desc; 416 else { 417 error = EINVAL; 418 goto bail; 419 } 420 } 421 422 if ((error = copyin(cop->src, cse->uio.uio_iov[0].iov_base, cop->len))) 423 goto bail; 424 425 if (crda) { 426 crda->crd_skip = 0; 427 crda->crd_len = cop->len; 428 crda->crd_inject = cop->len; 429 430 crda->crd_alg = cse->mac; 431 crda->crd_key = cse->mackey; 432 crda->crd_klen = cse->mackeylen * 8; 433 } 434 435 if (crde) { 436 if (cop->op == COP_ENCRYPT) 437 crde->crd_flags |= CRD_F_ENCRYPT; 438 else 439 crde->crd_flags &= ~CRD_F_ENCRYPT; 440 crde->crd_len = cop->len; 441 crde->crd_inject = 0; 442 443 crde->crd_alg = cse->cipher; 444 crde->crd_key = cse->key; 445 crde->crd_klen = cse->keylen * 8; 446 } 447 448 crp->crp_ilen = cop->len; 449 crp->crp_flags = CRYPTO_F_IOV | CRYPTO_F_CBIMM 450 | (cop->flags & COP_F_BATCH); 451 crp->crp_buf = (caddr_t)&cse->uio; 452 crp->crp_callback = (int (*) (struct cryptop *)) cryptodev_cb; 453 crp->crp_sid = cse->sid; 454 crp->crp_opaque = (void *)cse; 455 456 if (cop->iv) { 457 if (crde == NULL) { 458 error = EINVAL; 459 goto bail; 460 } 461 if (cse->cipher == CRYPTO_ARC4) { /* XXX use flag? */ 462 error = EINVAL; 463 goto bail; 464 } 465 if ((error = copyin(cop->iv, cse->tmp_iv, cse->txform->blocksize))) 466 goto bail; 467 bcopy(cse->tmp_iv, crde->crd_iv, cse->txform->blocksize); 468 crde->crd_flags |= CRD_F_IV_EXPLICIT | CRD_F_IV_PRESENT; 469 crde->crd_skip = 0; 470 } else if (cse->cipher == CRYPTO_ARC4) { /* XXX use flag? */ 471 crde->crd_skip = 0; 472 } else if (crde) { 473 crde->crd_flags |= CRD_F_IV_PRESENT; 474 crde->crd_skip = cse->txform->blocksize; 475 crde->crd_len -= cse->txform->blocksize; 476 } 477 478 if (cop->mac && crda == NULL) { 479 error = EINVAL; 480 goto bail; 481 } 482 483 /* 484 * Let the dispatch run unlocked, then, interlock against the 485 * callback before checking if the operation completed and going 486 * to sleep. This insures drivers don't inherit our lock which 487 * results in a lock order reversal between crypto_dispatch forced 488 * entry and the crypto_done callback into us. 489 */ 490 error = crypto_dispatch(crp); 491 mtx_lock(&cse->lock); 492 if (error == 0 && (crp->crp_flags & CRYPTO_F_DONE) == 0) 493 error = msleep(crp, &cse->lock, PWAIT, "crydev", 0); 494 mtx_unlock(&cse->lock); 495 496 if (error != 0) 497 goto bail; 498 499 if (crp->crp_etype != 0) { 500 error = crp->crp_etype; 501 goto bail; 502 } 503 504 if (cse->error) { 505 error = cse->error; 506 goto bail; 507 } 508 509 if (cop->dst && 510 (error = copyout(cse->uio.uio_iov[0].iov_base, cop->dst, cop->len))) 511 goto bail; 512 513 if (cop->mac && 514 (error = copyout((caddr_t)cse->uio.uio_iov[0].iov_base + cop->len, 515 cop->mac, cse->thash->hashsize))) 516 goto bail; 517 518bail: 519 if (crp) 520 crypto_freereq(crp); 521 if (cse->uio.uio_iov[0].iov_base) 522 free(cse->uio.uio_iov[0].iov_base, M_XDATA); 523 524 return (error); 525} 526 527static int 528cryptodev_cb(void *op) 529{ 530 struct cryptop *crp = (struct cryptop *) op; 531 struct csession *cse = (struct csession *)crp->crp_opaque; 532 int error; 533 534 error = crp->crp_etype; 535 if (error == EAGAIN) 536 error = crypto_dispatch(crp); 537 mtx_lock(&cse->lock); 538 if (error != 0 || (crp->crp_flags & CRYPTO_F_DONE)) { 539 cse->error = error; 540 wakeup_one(crp); 541 } 542 mtx_unlock(&cse->lock); 543 return (0); 544} 545 546static int 547cryptodevkey_cb(void *op) 548{ 549 struct cryptkop *krp = (struct cryptkop *) op; 550 551 wakeup_one(krp); 552 return (0); 553} 554 555static int 556cryptodev_key(struct crypt_kop *kop) 557{ 558 struct cryptkop *krp = NULL; 559 int error = EINVAL; 560 int in, out, size, i; 561 562 if (kop->crk_iparams + kop->crk_oparams > CRK_MAXPARAM) { 563 return (EFBIG); 564 } 565 566 in = kop->crk_iparams; 567 out = kop->crk_oparams; 568 switch (kop->crk_op) { 569 case CRK_MOD_EXP: 570 if (in == 3 && out == 1) 571 break; 572 return (EINVAL); 573 case CRK_MOD_EXP_CRT: 574 if (in == 6 && out == 1) 575 break; 576 return (EINVAL); 577 case CRK_DSA_SIGN: 578 if (in == 5 && out == 2) 579 break; 580 return (EINVAL); 581 case CRK_DSA_VERIFY: 582 if (in == 7 && out == 0) 583 break; 584 return (EINVAL); 585 case CRK_DH_COMPUTE_KEY: 586 if (in == 3 && out == 1) 587 break; 588 return (EINVAL); 589 default: 590 return (EINVAL); 591 } 592 593 krp = (struct cryptkop *)malloc(sizeof *krp, M_XDATA, M_WAITOK|M_ZERO); 594 if (!krp) 595 return (ENOMEM); 596 krp->krp_op = kop->crk_op; 597 krp->krp_status = kop->crk_status; 598 krp->krp_iparams = kop->crk_iparams; 599 krp->krp_oparams = kop->crk_oparams; 600 krp->krp_crid = kop->crk_crid; 601 krp->krp_status = 0; 602 krp->krp_callback = (int (*) (struct cryptkop *)) cryptodevkey_cb; 603 604 for (i = 0; i < CRK_MAXPARAM; i++) { 605 if (kop->crk_param[i].crp_nbits > 65536) 606 /* Limit is the same as in OpenBSD */ 607 goto fail; 608 krp->krp_param[i].crp_nbits = kop->crk_param[i].crp_nbits; 609 } 610 for (i = 0; i < krp->krp_iparams + krp->krp_oparams; i++) { 611 size = (krp->krp_param[i].crp_nbits + 7) / 8; 612 if (size == 0) 613 continue; 614 MALLOC(krp->krp_param[i].crp_p, caddr_t, size, M_XDATA, M_WAITOK); 615 if (i >= krp->krp_iparams) 616 continue; 617 error = copyin(kop->crk_param[i].crp_p, krp->krp_param[i].crp_p, size); 618 if (error) 619 goto fail; 620 } 621 622 error = crypto_kdispatch(krp); 623 if (error) 624 goto fail; 625 error = tsleep(krp, PSOCK, "crydev", 0); 626 if (error) { 627 /* XXX can this happen? if so, how do we recover? */ 628 goto fail; 629 } 630 631 kop->crk_crid = krp->krp_crid; /* device that did the work */ 632 if (krp->krp_status != 0) { 633 error = krp->krp_status; 634 goto fail; 635 } 636 637 for (i = krp->krp_iparams; i < krp->krp_iparams + krp->krp_oparams; i++) { 638 size = (krp->krp_param[i].crp_nbits + 7) / 8; 639 if (size == 0) 640 continue; 641 error = copyout(krp->krp_param[i].crp_p, kop->crk_param[i].crp_p, size); 642 if (error) 643 goto fail; 644 } 645 646fail: 647 if (krp) { 648 kop->crk_status = krp->krp_status; 649 for (i = 0; i < CRK_MAXPARAM; i++) { 650 if (krp->krp_param[i].crp_p) 651 FREE(krp->krp_param[i].crp_p, M_XDATA); 652 } 653 free(krp, M_XDATA); 654 } 655 return (error); 656} 657 658static int 659cryptodev_find(struct crypt_find_op *find) 660{ 661 device_t dev; 662 663 if (find->crid != -1) { 664 dev = crypto_find_device_byhid(find->crid); 665 if (dev == NULL) 666 return (ENOENT); 667 strlcpy(find->name, device_get_nameunit(dev), 668 sizeof(find->name)); 669 } else { 670 find->crid = crypto_find_driver(find->name); 671 if (find->crid == -1) 672 return (ENOENT); 673 } 674 return (0); 675} 676 677/* ARGSUSED */ 678static int 679cryptof_poll( 680 struct file *fp, 681 int events, 682 struct ucred *active_cred, 683 struct thread *td) 684{ 685 686 return (0); 687} 688 689/* ARGSUSED */ 690static int 691cryptof_kqfilter(struct file *fp, struct knote *kn) 692{ 693 694 return (0); 695} 696 697/* ARGSUSED */ 698static int 699cryptof_stat( 700 struct file *fp, 701 struct stat *sb, 702 struct ucred *active_cred, 703 struct thread *td) 704{ 705 706 return (EOPNOTSUPP); 707} 708 709/* ARGSUSED */ 710static int 711cryptof_close(struct file *fp, struct thread *td) 712{ 713 struct fcrypt *fcr = fp->f_data; 714 struct csession *cse; 715 716 while ((cse = TAILQ_FIRST(&fcr->csessions))) { 717 TAILQ_REMOVE(&fcr->csessions, cse, next); 718 (void)csefree(cse); 719 } 720 FREE(fcr, M_XDATA); 721 fp->f_data = NULL; 722 return 0; 723} 724 725static struct csession * 726csefind(struct fcrypt *fcr, u_int ses) 727{ 728 struct csession *cse; 729 730 TAILQ_FOREACH(cse, &fcr->csessions, next) 731 if (cse->ses == ses) 732 return (cse); 733 return (NULL); 734} 735 736static int 737csedelete(struct fcrypt *fcr, struct csession *cse_del) 738{ 739 struct csession *cse; 740 741 TAILQ_FOREACH(cse, &fcr->csessions, next) { 742 if (cse == cse_del) { 743 TAILQ_REMOVE(&fcr->csessions, cse, next); 744 return (1); 745 } 746 } 747 return (0); 748} 749 750static struct csession * 751cseadd(struct fcrypt *fcr, struct csession *cse) 752{ 753 TAILQ_INSERT_TAIL(&fcr->csessions, cse, next); 754 cse->ses = fcr->sesn++; 755 return (cse); 756} 757 758struct csession * 759csecreate(struct fcrypt *fcr, u_int64_t sid, caddr_t key, u_int64_t keylen, 760 caddr_t mackey, u_int64_t mackeylen, u_int32_t cipher, u_int32_t mac, 761 struct enc_xform *txform, struct auth_hash *thash) 762{ 763 struct csession *cse; 764 765#ifdef INVARIANTS 766 /* NB: required when mtx_init is built with INVARIANTS */ 767 MALLOC(cse, struct csession *, sizeof(struct csession), 768 M_XDATA, M_NOWAIT | M_ZERO); 769#else 770 MALLOC(cse, struct csession *, sizeof(struct csession), 771 M_XDATA, M_NOWAIT); 772#endif 773 if (cse == NULL) 774 return NULL; 775 mtx_init(&cse->lock, "cryptodev", "crypto session lock", MTX_DEF); 776 cse->key = key; 777 cse->keylen = keylen/8; 778 cse->mackey = mackey; 779 cse->mackeylen = mackeylen/8; 780 cse->sid = sid; 781 cse->cipher = cipher; 782 cse->mac = mac; 783 cse->txform = txform; 784 cse->thash = thash; 785 cseadd(fcr, cse); 786 return (cse); 787} 788 789static int 790csefree(struct csession *cse) 791{ 792 int error; 793 794 error = crypto_freesession(cse->sid); 795 mtx_destroy(&cse->lock); 796 if (cse->key) 797 FREE(cse->key, M_XDATA); 798 if (cse->mackey) 799 FREE(cse->mackey, M_XDATA); 800 FREE(cse, M_XDATA); 801 return (error); 802} 803 804static int 805cryptoopen(struct cdev *dev, int oflags, int devtype, struct thread *td) 806{ 807 return (0); 808} 809 810static int 811cryptoread(struct cdev *dev, struct uio *uio, int ioflag) 812{ 813 return (EIO); 814} 815 816static int 817cryptowrite(struct cdev *dev, struct uio *uio, int ioflag) 818{ 819 return (EIO); 820} 821 822static int 823cryptoioctl(struct cdev *dev, u_long cmd, caddr_t data, int flag, struct thread *td) 824{ 825 struct file *f; 826 struct fcrypt *fcr; 827 int fd, error; 828 829 switch (cmd) { 830 case CRIOGET: 831 MALLOC(fcr, struct fcrypt *, 832 sizeof(struct fcrypt), M_XDATA, M_WAITOK); 833 TAILQ_INIT(&fcr->csessions); 834 fcr->sesn = 0; 835 836 error = falloc(td, &f, &fd); 837 838 if (error) { 839 FREE(fcr, M_XDATA); 840 return (error); 841 } 842 /* falloc automatically provides an extra reference to 'f'. */ 843 FILE_LOCK(f); 844 f->f_flag = FREAD | FWRITE; 845 f->f_type = DTYPE_CRYPTO; 846 f->f_data = fcr; 847 f->f_ops = &cryptofops; 848 FILE_UNLOCK(f); 849 *(u_int32_t *)data = fd; 850 fdrop(f, td); 851 break; 852 case CRIOFINDDEV: 853 error = cryptodev_find((struct crypt_find_op *)data); 854 break; 855 case CRIOASYMFEAT: 856 error = crypto_getfeat((int *)data); 857 break; 858 default: 859 error = EINVAL; 860 break; 861 } 862 return (error); 863} 864 865static struct cdevsw crypto_cdevsw = { 866 .d_version = D_VERSION, 867 .d_flags = D_NEEDGIANT, 868 .d_open = cryptoopen, 869 .d_read = cryptoread, 870 .d_write = cryptowrite, 871 .d_ioctl = cryptoioctl, 872 .d_name = "crypto", 873}; 874static struct cdev *crypto_dev; 875 876/* 877 * Initialization code, both for static and dynamic loading. 878 */ 879static int 880cryptodev_modevent(module_t mod, int type, void *unused) 881{ 882 switch (type) { 883 case MOD_LOAD: 884 if (bootverbose) 885 printf("crypto: <crypto device>\n"); 886 crypto_dev = make_dev(&crypto_cdevsw, 0, 887 UID_ROOT, GID_WHEEL, 0666, 888 "crypto"); 889 return 0; 890 case MOD_UNLOAD: 891 /*XXX disallow if active sessions */ 892 destroy_dev(crypto_dev); 893 return 0; 894 } 895 return EINVAL; 896} 897 898static moduledata_t cryptodev_mod = { 899 "cryptodev", 900 cryptodev_modevent, 901 0 902}; 903MODULE_VERSION(cryptodev, 1); 904DECLARE_MODULE(cryptodev, cryptodev_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 905MODULE_DEPEND(cryptodev, crypto, 1, 1, 1); 906MODULE_DEPEND(cryptodev, zlib, 1, 1, 1); 907