1 /*- 2 * Copyright (c) 2002-2006 Sam Leffler. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 14 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 15 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 16 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 17 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 18 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 19 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 20 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 21 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 22 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 23 */ 24 25 #include <sys/cdefs.h> 26 __FBSDID("$FreeBSD$"); 27 28 /* 29 * Cryptographic Subsystem. 30 * 31 * This code is derived from the Openbsd Cryptographic Framework (OCF) 32 * that has the copyright shown below. Very little of the original 33 * code remains. 34 */ 35 36 /*- 37 * The author of this code is Angelos D. Keromytis (angelos@cis.upenn.edu) 38 * 39 * This code was written by Angelos D. Keromytis in Athens, Greece, in 40 * February 2000. Network Security Technologies Inc. (NSTI) kindly 41 * supported the development of this code. 42 * 43 * Copyright (c) 2000, 2001 Angelos D. Keromytis 44 * 45 * Permission to use, copy, and modify this software with or without fee 46 * is hereby granted, provided that this entire notice is included in 47 * all source code copies of any software which is or includes a copy or 48 * modification of this software. 49 * 50 * THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR 51 * IMPLIED WARRANTY. IN PARTICULAR, NONE OF THE AUTHORS MAKES ANY 52 * REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE 53 * MERCHANTABILITY OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR 54 * PURPOSE. 55 */ 56 57 #define CRYPTO_TIMING /* enable timing support */ 58 59 #include "opt_ddb.h" 60 61 #include <sys/param.h> 62 #include <sys/systm.h> 63 #include <sys/eventhandler.h> 64 #include <sys/kernel.h> 65 #include <sys/kthread.h> 66 #include <sys/lock.h> 67 #include <sys/module.h> 68 #include <sys/mutex.h> 69 #include <sys/malloc.h> 70 #include <sys/proc.h> 71 #include <sys/sdt.h> 72 #include <sys/sysctl.h> 73 74 #include <ddb/ddb.h> 75 76 #include <vm/uma.h> 77 #include <opencrypto/cryptodev.h> 78 #include <opencrypto/xform.h> /* XXX for M_XDATA */ 79 80 #include <sys/kobj.h> 81 #include <sys/bus.h> 82 #include "cryptodev_if.h" 83 84 #if defined(__i386__) || defined(__amd64__) 85 #include <machine/pcb.h> 86 #endif 87 88 SDT_PROVIDER_DEFINE(opencrypto); 89 90 /* 91 * Crypto drivers register themselves by allocating a slot in the 92 * crypto_drivers table with crypto_get_driverid() and then registering 93 * each algorithm they support with crypto_register() and crypto_kregister(). 94 */ 95 static struct mtx crypto_drivers_mtx; /* lock on driver table */ 96 #define CRYPTO_DRIVER_LOCK() mtx_lock(&crypto_drivers_mtx) 97 #define CRYPTO_DRIVER_UNLOCK() mtx_unlock(&crypto_drivers_mtx) 98 #define CRYPTO_DRIVER_ASSERT() mtx_assert(&crypto_drivers_mtx, MA_OWNED) 99 100 /* 101 * Crypto device/driver capabilities structure. 102 * 103 * Synchronization: 104 * (d) - protected by CRYPTO_DRIVER_LOCK() 105 * (q) - protected by CRYPTO_Q_LOCK() 106 * Not tagged fields are read-only. 107 */ 108 struct cryptocap { 109 device_t cc_dev; /* (d) device/driver */ 110 u_int32_t cc_sessions; /* (d) # of sessions */ 111 u_int32_t cc_koperations; /* (d) # os asym operations */ 112 /* 113 * Largest possible operator length (in bits) for each type of 114 * encryption algorithm. XXX not used 115 */ 116 u_int16_t cc_max_op_len[CRYPTO_ALGORITHM_MAX + 1]; 117 u_int8_t cc_alg[CRYPTO_ALGORITHM_MAX + 1]; 118 u_int8_t cc_kalg[CRK_ALGORITHM_MAX + 1]; 119 120 int cc_flags; /* (d) flags */ 121 #define CRYPTOCAP_F_CLEANUP 0x80000000 /* needs resource cleanup */ 122 int cc_qblocked; /* (q) symmetric q blocked */ 123 int cc_kqblocked; /* (q) asymmetric q blocked */ 124 }; 125 static struct cryptocap *crypto_drivers = NULL; 126 static int crypto_drivers_num = 0; 127 128 /* 129 * There are two queues for crypto requests; one for symmetric (e.g. 130 * cipher) operations and one for asymmetric (e.g. MOD)operations. 131 * A single mutex is used to lock access to both queues. We could 132 * have one per-queue but having one simplifies handling of block/unblock 133 * operations. 134 */ 135 static int crp_sleep = 0; 136 static TAILQ_HEAD(,cryptop) crp_q; /* request queues */ 137 static TAILQ_HEAD(,cryptkop) crp_kq; 138 static struct mtx crypto_q_mtx; 139 #define CRYPTO_Q_LOCK() mtx_lock(&crypto_q_mtx) 140 #define CRYPTO_Q_UNLOCK() mtx_unlock(&crypto_q_mtx) 141 142 /* 143 * There are two queues for processing completed crypto requests; one 144 * for the symmetric and one for the asymmetric ops. We only need one 145 * but have two to avoid type futzing (cryptop vs. cryptkop). A single 146 * mutex is used to lock access to both queues. Note that this lock 147 * must be separate from the lock on request queues to insure driver 148 * callbacks don't generate lock order reversals. 149 */ 150 static TAILQ_HEAD(,cryptop) crp_ret_q; /* callback queues */ 151 static TAILQ_HEAD(,cryptkop) crp_ret_kq; 152 static struct mtx crypto_ret_q_mtx; 153 #define CRYPTO_RETQ_LOCK() mtx_lock(&crypto_ret_q_mtx) 154 #define CRYPTO_RETQ_UNLOCK() mtx_unlock(&crypto_ret_q_mtx) 155 #define CRYPTO_RETQ_EMPTY() (TAILQ_EMPTY(&crp_ret_q) && TAILQ_EMPTY(&crp_ret_kq)) 156 157 static uma_zone_t cryptop_zone; 158 static uma_zone_t cryptodesc_zone; 159 160 int crypto_userasymcrypto = 1; /* userland may do asym crypto reqs */ 161 SYSCTL_INT(_kern, OID_AUTO, userasymcrypto, CTLFLAG_RW, 162 &crypto_userasymcrypto, 0, 163 "Enable/disable user-mode access to asymmetric crypto support"); 164 int crypto_devallowsoft = 0; /* only use hardware crypto */ 165 SYSCTL_INT(_kern, OID_AUTO, cryptodevallowsoft, CTLFLAG_RW, 166 &crypto_devallowsoft, 0, 167 "Enable/disable use of software crypto by /dev/crypto"); 168 169 MALLOC_DEFINE(M_CRYPTO_DATA, "crypto", "crypto session records"); 170 171 static void crypto_proc(void); 172 static struct proc *cryptoproc; 173 static void crypto_ret_proc(void); 174 static struct proc *cryptoretproc; 175 static void crypto_destroy(void); 176 static int crypto_invoke(struct cryptocap *cap, struct cryptop *crp, int hint); 177 static int crypto_kinvoke(struct cryptkop *krp, int flags); 178 179 static struct cryptostats cryptostats; 180 SYSCTL_STRUCT(_kern, OID_AUTO, crypto_stats, CTLFLAG_RW, &cryptostats, 181 cryptostats, "Crypto system statistics"); 182 183 #ifdef CRYPTO_TIMING 184 static int crypto_timing = 0; 185 SYSCTL_INT(_debug, OID_AUTO, crypto_timing, CTLFLAG_RW, 186 &crypto_timing, 0, "Enable/disable crypto timing support"); 187 #endif 188 189 static int 190 crypto_init(void) 191 { 192 int error; 193 194 mtx_init(&crypto_drivers_mtx, "crypto", "crypto driver table", 195 MTX_DEF|MTX_QUIET); 196 197 TAILQ_INIT(&crp_q); 198 TAILQ_INIT(&crp_kq); 199 mtx_init(&crypto_q_mtx, "crypto", "crypto op queues", MTX_DEF); 200 201 TAILQ_INIT(&crp_ret_q); 202 TAILQ_INIT(&crp_ret_kq); 203 mtx_init(&crypto_ret_q_mtx, "crypto", "crypto return queues", MTX_DEF); 204 205 cryptop_zone = uma_zcreate("cryptop", sizeof (struct cryptop), 206 0, 0, 0, 0, 207 UMA_ALIGN_PTR, UMA_ZONE_ZINIT); 208 cryptodesc_zone = uma_zcreate("cryptodesc", sizeof (struct cryptodesc), 209 0, 0, 0, 0, 210 UMA_ALIGN_PTR, UMA_ZONE_ZINIT); 211 if (cryptodesc_zone == NULL || cryptop_zone == NULL) { 212 printf("crypto_init: cannot setup crypto zones\n"); 213 error = ENOMEM; 214 goto bad; 215 } 216 217 crypto_drivers_num = CRYPTO_DRIVERS_INITIAL; 218 crypto_drivers = malloc(crypto_drivers_num * 219 sizeof(struct cryptocap), M_CRYPTO_DATA, M_NOWAIT | M_ZERO); 220 if (crypto_drivers == NULL) { 221 printf("crypto_init: cannot setup crypto drivers\n"); 222 error = ENOMEM; 223 goto bad; 224 } 225 226 error = kproc_create((void (*)(void *)) crypto_proc, NULL, 227 &cryptoproc, 0, 0, "crypto"); 228 if (error) { 229 printf("crypto_init: cannot start crypto thread; error %d", 230 error); 231 goto bad; 232 } 233 234 error = kproc_create((void (*)(void *)) crypto_ret_proc, NULL, 235 &cryptoretproc, 0, 0, "crypto returns"); 236 if (error) { 237 printf("crypto_init: cannot start cryptoret thread; error %d", 238 error); 239 goto bad; 240 } 241 return 0; 242 bad: 243 crypto_destroy(); 244 return error; 245 } 246 247 /* 248 * Signal a crypto thread to terminate. We use the driver 249 * table lock to synchronize the sleep/wakeups so that we 250 * are sure the threads have terminated before we release 251 * the data structures they use. See crypto_finis below 252 * for the other half of this song-and-dance. 253 */ 254 static void 255 crypto_terminate(struct proc **pp, void *q) 256 { 257 struct proc *p; 258 259 mtx_assert(&crypto_drivers_mtx, MA_OWNED); 260 p = *pp; 261 *pp = NULL; 262 if (p) { 263 wakeup_one(q); 264 PROC_LOCK(p); /* NB: insure we don't miss wakeup */ 265 CRYPTO_DRIVER_UNLOCK(); /* let crypto_finis progress */ 266 msleep(p, &p->p_mtx, PWAIT, "crypto_destroy", 0); 267 PROC_UNLOCK(p); 268 CRYPTO_DRIVER_LOCK(); 269 } 270 } 271 272 static void 273 crypto_destroy(void) 274 { 275 /* 276 * Terminate any crypto threads. 277 */ 278 CRYPTO_DRIVER_LOCK(); 279 crypto_terminate(&cryptoproc, &crp_q); 280 crypto_terminate(&cryptoretproc, &crp_ret_q); 281 CRYPTO_DRIVER_UNLOCK(); 282 283 /* XXX flush queues??? */ 284 285 /* 286 * Reclaim dynamically allocated resources. 287 */ 288 if (crypto_drivers != NULL) 289 free(crypto_drivers, M_CRYPTO_DATA); 290 291 if (cryptodesc_zone != NULL) 292 uma_zdestroy(cryptodesc_zone); 293 if (cryptop_zone != NULL) 294 uma_zdestroy(cryptop_zone); 295 mtx_destroy(&crypto_q_mtx); 296 mtx_destroy(&crypto_ret_q_mtx); 297 mtx_destroy(&crypto_drivers_mtx); 298 } 299 300 static struct cryptocap * 301 crypto_checkdriver(u_int32_t hid) 302 { 303 if (crypto_drivers == NULL) 304 return NULL; 305 return (hid >= crypto_drivers_num ? NULL : &crypto_drivers[hid]); 306 } 307 308 /* 309 * Compare a driver's list of supported algorithms against another 310 * list; return non-zero if all algorithms are supported. 311 */ 312 static int 313 driver_suitable(const struct cryptocap *cap, const struct cryptoini *cri) 314 { 315 const struct cryptoini *cr; 316 317 /* See if all the algorithms are supported. */ 318 for (cr = cri; cr; cr = cr->cri_next) 319 if (cap->cc_alg[cr->cri_alg] == 0) 320 return 0; 321 return 1; 322 } 323 324 /* 325 * Select a driver for a new session that supports the specified 326 * algorithms and, optionally, is constrained according to the flags. 327 * The algorithm we use here is pretty stupid; just use the 328 * first driver that supports all the algorithms we need. If there 329 * are multiple drivers we choose the driver with the fewest active 330 * sessions. We prefer hardware-backed drivers to software ones. 331 * 332 * XXX We need more smarts here (in real life too, but that's 333 * XXX another story altogether). 334 */ 335 static struct cryptocap * 336 crypto_select_driver(const struct cryptoini *cri, int flags) 337 { 338 struct cryptocap *cap, *best; 339 int match, hid; 340 341 CRYPTO_DRIVER_ASSERT(); 342 343 /* 344 * Look first for hardware crypto devices if permitted. 345 */ 346 if (flags & CRYPTOCAP_F_HARDWARE) 347 match = CRYPTOCAP_F_HARDWARE; 348 else 349 match = CRYPTOCAP_F_SOFTWARE; 350 best = NULL; 351 again: 352 for (hid = 0; hid < crypto_drivers_num; hid++) { 353 cap = &crypto_drivers[hid]; 354 /* 355 * If it's not initialized, is in the process of 356 * going away, or is not appropriate (hardware 357 * or software based on match), then skip. 358 */ 359 if (cap->cc_dev == NULL || 360 (cap->cc_flags & CRYPTOCAP_F_CLEANUP) || 361 (cap->cc_flags & match) == 0) 362 continue; 363 364 /* verify all the algorithms are supported. */ 365 if (driver_suitable(cap, cri)) { 366 if (best == NULL || 367 cap->cc_sessions < best->cc_sessions) 368 best = cap; 369 } 370 } 371 if (best == NULL && match == CRYPTOCAP_F_HARDWARE && 372 (flags & CRYPTOCAP_F_SOFTWARE)) { 373 /* sort of an Algol 68-style for loop */ 374 match = CRYPTOCAP_F_SOFTWARE; 375 goto again; 376 } 377 return best; 378 } 379 380 /* 381 * Create a new session. The crid argument specifies a crypto 382 * driver to use or constraints on a driver to select (hardware 383 * only, software only, either). Whatever driver is selected 384 * must be capable of the requested crypto algorithms. 385 */ 386 int 387 crypto_newsession(u_int64_t *sid, struct cryptoini *cri, int crid) 388 { 389 struct cryptocap *cap; 390 u_int32_t hid, lid; 391 int err; 392 393 CRYPTO_DRIVER_LOCK(); 394 if ((crid & (CRYPTOCAP_F_HARDWARE | CRYPTOCAP_F_SOFTWARE)) == 0) { 395 /* 396 * Use specified driver; verify it is capable. 397 */ 398 cap = crypto_checkdriver(crid); 399 if (cap != NULL && !driver_suitable(cap, cri)) 400 cap = NULL; 401 } else { 402 /* 403 * No requested driver; select based on crid flags. 404 */ 405 cap = crypto_select_driver(cri, crid); 406 /* 407 * if NULL then can't do everything in one session. 408 * XXX Fix this. We need to inject a "virtual" session 409 * XXX layer right about here. 410 */ 411 } 412 if (cap != NULL) { 413 /* Call the driver initialization routine. */ 414 hid = cap - crypto_drivers; 415 lid = hid; /* Pass the driver ID. */ 416 err = CRYPTODEV_NEWSESSION(cap->cc_dev, &lid, cri); 417 if (err == 0) { 418 (*sid) = (cap->cc_flags & 0xff000000) 419 | (hid & 0x00ffffff); 420 (*sid) <<= 32; 421 (*sid) |= (lid & 0xffffffff); 422 cap->cc_sessions++; 423 } else 424 CRYPTDEB("dev newsession failed"); 425 } else { 426 CRYPTDEB("no driver"); 427 err = EINVAL; 428 } 429 CRYPTO_DRIVER_UNLOCK(); 430 return err; 431 } 432 433 static void 434 crypto_remove(struct cryptocap *cap) 435 { 436 437 mtx_assert(&crypto_drivers_mtx, MA_OWNED); 438 if (cap->cc_sessions == 0 && cap->cc_koperations == 0) 439 bzero(cap, sizeof(*cap)); 440 } 441 442 /* 443 * Delete an existing session (or a reserved session on an unregistered 444 * driver). 445 */ 446 int 447 crypto_freesession(u_int64_t sid) 448 { 449 struct cryptocap *cap; 450 u_int32_t hid; 451 int err; 452 453 CRYPTO_DRIVER_LOCK(); 454 455 if (crypto_drivers == NULL) { 456 err = EINVAL; 457 goto done; 458 } 459 460 /* Determine two IDs. */ 461 hid = CRYPTO_SESID2HID(sid); 462 463 if (hid >= crypto_drivers_num) { 464 err = ENOENT; 465 goto done; 466 } 467 cap = &crypto_drivers[hid]; 468 469 if (cap->cc_sessions) 470 cap->cc_sessions--; 471 472 /* Call the driver cleanup routine, if available. */ 473 err = CRYPTODEV_FREESESSION(cap->cc_dev, sid); 474 475 if (cap->cc_flags & CRYPTOCAP_F_CLEANUP) 476 crypto_remove(cap); 477 478 done: 479 CRYPTO_DRIVER_UNLOCK(); 480 return err; 481 } 482 483 /* 484 * Return an unused driver id. Used by drivers prior to registering 485 * support for the algorithms they handle. 486 */ 487 int32_t 488 crypto_get_driverid(device_t dev, int flags) 489 { 490 struct cryptocap *newdrv; 491 int i; 492 493 if ((flags & (CRYPTOCAP_F_HARDWARE | CRYPTOCAP_F_SOFTWARE)) == 0) { 494 printf("%s: no flags specified when registering driver\n", 495 device_get_nameunit(dev)); 496 return -1; 497 } 498 499 CRYPTO_DRIVER_LOCK(); 500 501 for (i = 0; i < crypto_drivers_num; i++) { 502 if (crypto_drivers[i].cc_dev == NULL && 503 (crypto_drivers[i].cc_flags & CRYPTOCAP_F_CLEANUP) == 0) { 504 break; 505 } 506 } 507 508 /* Out of entries, allocate some more. */ 509 if (i == crypto_drivers_num) { 510 /* Be careful about wrap-around. */ 511 if (2 * crypto_drivers_num <= crypto_drivers_num) { 512 CRYPTO_DRIVER_UNLOCK(); 513 printf("crypto: driver count wraparound!\n"); 514 return -1; 515 } 516 517 newdrv = malloc(2 * crypto_drivers_num * 518 sizeof(struct cryptocap), M_CRYPTO_DATA, M_NOWAIT|M_ZERO); 519 if (newdrv == NULL) { 520 CRYPTO_DRIVER_UNLOCK(); 521 printf("crypto: no space to expand driver table!\n"); 522 return -1; 523 } 524 525 bcopy(crypto_drivers, newdrv, 526 crypto_drivers_num * sizeof(struct cryptocap)); 527 528 crypto_drivers_num *= 2; 529 530 free(crypto_drivers, M_CRYPTO_DATA); 531 crypto_drivers = newdrv; 532 } 533 534 /* NB: state is zero'd on free */ 535 crypto_drivers[i].cc_sessions = 1; /* Mark */ 536 crypto_drivers[i].cc_dev = dev; 537 crypto_drivers[i].cc_flags = flags; 538 if (bootverbose) 539 printf("crypto: assign %s driver id %u, flags %u\n", 540 device_get_nameunit(dev), i, flags); 541 542 CRYPTO_DRIVER_UNLOCK(); 543 544 return i; 545 } 546 547 /* 548 * Lookup a driver by name. We match against the full device 549 * name and unit, and against just the name. The latter gives 550 * us a simple widlcarding by device name. On success return the 551 * driver/hardware identifier; otherwise return -1. 552 */ 553 int 554 crypto_find_driver(const char *match) 555 { 556 int i, len = strlen(match); 557 558 CRYPTO_DRIVER_LOCK(); 559 for (i = 0; i < crypto_drivers_num; i++) { 560 device_t dev = crypto_drivers[i].cc_dev; 561 if (dev == NULL || 562 (crypto_drivers[i].cc_flags & CRYPTOCAP_F_CLEANUP)) 563 continue; 564 if (strncmp(match, device_get_nameunit(dev), len) == 0 || 565 strncmp(match, device_get_name(dev), len) == 0) 566 break; 567 } 568 CRYPTO_DRIVER_UNLOCK(); 569 return i < crypto_drivers_num ? i : -1; 570 } 571 572 /* 573 * Return the device_t for the specified driver or NULL 574 * if the driver identifier is invalid. 575 */ 576 device_t 577 crypto_find_device_byhid(int hid) 578 { 579 struct cryptocap *cap = crypto_checkdriver(hid); 580 return cap != NULL ? cap->cc_dev : NULL; 581 } 582 583 /* 584 * Return the device/driver capabilities. 585 */ 586 int 587 crypto_getcaps(int hid) 588 { 589 struct cryptocap *cap = crypto_checkdriver(hid); 590 return cap != NULL ? cap->cc_flags : 0; 591 } 592 593 /* 594 * Register support for a key-related algorithm. This routine 595 * is called once for each algorithm supported a driver. 596 */ 597 int 598 crypto_kregister(u_int32_t driverid, int kalg, u_int32_t flags) 599 { 600 struct cryptocap *cap; 601 int err; 602 603 CRYPTO_DRIVER_LOCK(); 604 605 cap = crypto_checkdriver(driverid); 606 if (cap != NULL && 607 (CRK_ALGORITM_MIN <= kalg && kalg <= CRK_ALGORITHM_MAX)) { 608 /* 609 * XXX Do some performance testing to determine placing. 610 * XXX We probably need an auxiliary data structure that 611 * XXX describes relative performances. 612 */ 613 614 cap->cc_kalg[kalg] = flags | CRYPTO_ALG_FLAG_SUPPORTED; 615 if (bootverbose) 616 printf("crypto: %s registers key alg %u flags %u\n" 617 , device_get_nameunit(cap->cc_dev) 618 , kalg 619 , flags 620 ); 621 err = 0; 622 } else 623 err = EINVAL; 624 625 CRYPTO_DRIVER_UNLOCK(); 626 return err; 627 } 628 629 /* 630 * Register support for a non-key-related algorithm. This routine 631 * is called once for each such algorithm supported by a driver. 632 */ 633 int 634 crypto_register(u_int32_t driverid, int alg, u_int16_t maxoplen, 635 u_int32_t flags) 636 { 637 struct cryptocap *cap; 638 int err; 639 640 CRYPTO_DRIVER_LOCK(); 641 642 cap = crypto_checkdriver(driverid); 643 /* NB: algorithms are in the range [1..max] */ 644 if (cap != NULL && 645 (CRYPTO_ALGORITHM_MIN <= alg && alg <= CRYPTO_ALGORITHM_MAX)) { 646 /* 647 * XXX Do some performance testing to determine placing. 648 * XXX We probably need an auxiliary data structure that 649 * XXX describes relative performances. 650 */ 651 652 cap->cc_alg[alg] = flags | CRYPTO_ALG_FLAG_SUPPORTED; 653 cap->cc_max_op_len[alg] = maxoplen; 654 if (bootverbose) 655 printf("crypto: %s registers alg %u flags %u maxoplen %u\n" 656 , device_get_nameunit(cap->cc_dev) 657 , alg 658 , flags 659 , maxoplen 660 ); 661 cap->cc_sessions = 0; /* Unmark */ 662 err = 0; 663 } else 664 err = EINVAL; 665 666 CRYPTO_DRIVER_UNLOCK(); 667 return err; 668 } 669 670 static void 671 driver_finis(struct cryptocap *cap) 672 { 673 u_int32_t ses, kops; 674 675 CRYPTO_DRIVER_ASSERT(); 676 677 ses = cap->cc_sessions; 678 kops = cap->cc_koperations; 679 bzero(cap, sizeof(*cap)); 680 if (ses != 0 || kops != 0) { 681 /* 682 * If there are pending sessions, 683 * just mark as invalid. 684 */ 685 cap->cc_flags |= CRYPTOCAP_F_CLEANUP; 686 cap->cc_sessions = ses; 687 cap->cc_koperations = kops; 688 } 689 } 690 691 /* 692 * Unregister a crypto driver. If there are pending sessions using it, 693 * leave enough information around so that subsequent calls using those 694 * sessions will correctly detect the driver has been unregistered and 695 * reroute requests. 696 */ 697 int 698 crypto_unregister(u_int32_t driverid, int alg) 699 { 700 struct cryptocap *cap; 701 int i, err; 702 703 CRYPTO_DRIVER_LOCK(); 704 cap = crypto_checkdriver(driverid); 705 if (cap != NULL && 706 (CRYPTO_ALGORITHM_MIN <= alg && alg <= CRYPTO_ALGORITHM_MAX) && 707 cap->cc_alg[alg] != 0) { 708 cap->cc_alg[alg] = 0; 709 cap->cc_max_op_len[alg] = 0; 710 711 /* Was this the last algorithm ? */ 712 for (i = 1; i <= CRYPTO_ALGORITHM_MAX; i++) 713 if (cap->cc_alg[i] != 0) 714 break; 715 716 if (i == CRYPTO_ALGORITHM_MAX + 1) 717 driver_finis(cap); 718 err = 0; 719 } else 720 err = EINVAL; 721 CRYPTO_DRIVER_UNLOCK(); 722 723 return err; 724 } 725 726 /* 727 * Unregister all algorithms associated with a crypto driver. 728 * If there are pending sessions using it, leave enough information 729 * around so that subsequent calls using those sessions will 730 * correctly detect the driver has been unregistered and reroute 731 * requests. 732 */ 733 int 734 crypto_unregister_all(u_int32_t driverid) 735 { 736 struct cryptocap *cap; 737 int err; 738 739 CRYPTO_DRIVER_LOCK(); 740 cap = crypto_checkdriver(driverid); 741 if (cap != NULL) { 742 driver_finis(cap); 743 err = 0; 744 } else 745 err = EINVAL; 746 CRYPTO_DRIVER_UNLOCK(); 747 748 return err; 749 } 750 751 /* 752 * Clear blockage on a driver. The what parameter indicates whether 753 * the driver is now ready for cryptop's and/or cryptokop's. 754 */ 755 int 756 crypto_unblock(u_int32_t driverid, int what) 757 { 758 struct cryptocap *cap; 759 int err; 760 761 CRYPTO_Q_LOCK(); 762 cap = crypto_checkdriver(driverid); 763 if (cap != NULL) { 764 if (what & CRYPTO_SYMQ) 765 cap->cc_qblocked = 0; 766 if (what & CRYPTO_ASYMQ) 767 cap->cc_kqblocked = 0; 768 if (crp_sleep) 769 wakeup_one(&crp_q); 770 err = 0; 771 } else 772 err = EINVAL; 773 CRYPTO_Q_UNLOCK(); 774 775 return err; 776 } 777 778 /* 779 * Add a crypto request to a queue, to be processed by the kernel thread. 780 */ 781 int 782 crypto_dispatch(struct cryptop *crp) 783 { 784 struct cryptocap *cap; 785 u_int32_t hid; 786 int result; 787 788 cryptostats.cs_ops++; 789 790 #ifdef CRYPTO_TIMING 791 if (crypto_timing) 792 binuptime(&crp->crp_tstamp); 793 #endif 794 795 hid = CRYPTO_SESID2HID(crp->crp_sid); 796 797 if ((crp->crp_flags & CRYPTO_F_BATCH) == 0) { 798 /* 799 * Caller marked the request to be processed 800 * immediately; dispatch it directly to the 801 * driver unless the driver is currently blocked. 802 */ 803 cap = crypto_checkdriver(hid); 804 /* Driver cannot disappeared when there is an active session. */ 805 KASSERT(cap != NULL, ("%s: Driver disappeared.", __func__)); 806 if (!cap->cc_qblocked) { 807 result = crypto_invoke(cap, crp, 0); 808 if (result != ERESTART) 809 return (result); 810 /* 811 * The driver ran out of resources, put the request on 812 * the queue. 813 */ 814 } 815 } 816 CRYPTO_Q_LOCK(); 817 TAILQ_INSERT_TAIL(&crp_q, crp, crp_next); 818 if (crp_sleep) 819 wakeup_one(&crp_q); 820 CRYPTO_Q_UNLOCK(); 821 return 0; 822 } 823 824 /* 825 * Add an asymetric crypto request to a queue, 826 * to be processed by the kernel thread. 827 */ 828 int 829 crypto_kdispatch(struct cryptkop *krp) 830 { 831 int error; 832 833 cryptostats.cs_kops++; 834 835 error = crypto_kinvoke(krp, krp->krp_crid); 836 if (error == ERESTART) { 837 CRYPTO_Q_LOCK(); 838 TAILQ_INSERT_TAIL(&crp_kq, krp, krp_next); 839 if (crp_sleep) 840 wakeup_one(&crp_q); 841 CRYPTO_Q_UNLOCK(); 842 error = 0; 843 } 844 return error; 845 } 846 847 /* 848 * Verify a driver is suitable for the specified operation. 849 */ 850 static __inline int 851 kdriver_suitable(const struct cryptocap *cap, const struct cryptkop *krp) 852 { 853 return (cap->cc_kalg[krp->krp_op] & CRYPTO_ALG_FLAG_SUPPORTED) != 0; 854 } 855 856 /* 857 * Select a driver for an asym operation. The driver must 858 * support the necessary algorithm. The caller can constrain 859 * which device is selected with the flags parameter. The 860 * algorithm we use here is pretty stupid; just use the first 861 * driver that supports the algorithms we need. If there are 862 * multiple suitable drivers we choose the driver with the 863 * fewest active operations. We prefer hardware-backed 864 * drivers to software ones when either may be used. 865 */ 866 static struct cryptocap * 867 crypto_select_kdriver(const struct cryptkop *krp, int flags) 868 { 869 struct cryptocap *cap, *best, *blocked; 870 int match, hid; 871 872 CRYPTO_DRIVER_ASSERT(); 873 874 /* 875 * Look first for hardware crypto devices if permitted. 876 */ 877 if (flags & CRYPTOCAP_F_HARDWARE) 878 match = CRYPTOCAP_F_HARDWARE; 879 else 880 match = CRYPTOCAP_F_SOFTWARE; 881 best = NULL; 882 blocked = NULL; 883 again: 884 for (hid = 0; hid < crypto_drivers_num; hid++) { 885 cap = &crypto_drivers[hid]; 886 /* 887 * If it's not initialized, is in the process of 888 * going away, or is not appropriate (hardware 889 * or software based on match), then skip. 890 */ 891 if (cap->cc_dev == NULL || 892 (cap->cc_flags & CRYPTOCAP_F_CLEANUP) || 893 (cap->cc_flags & match) == 0) 894 continue; 895 896 /* verify all the algorithms are supported. */ 897 if (kdriver_suitable(cap, krp)) { 898 if (best == NULL || 899 cap->cc_koperations < best->cc_koperations) 900 best = cap; 901 } 902 } 903 if (best != NULL) 904 return best; 905 if (match == CRYPTOCAP_F_HARDWARE && (flags & CRYPTOCAP_F_SOFTWARE)) { 906 /* sort of an Algol 68-style for loop */ 907 match = CRYPTOCAP_F_SOFTWARE; 908 goto again; 909 } 910 return best; 911 } 912 913 /* 914 * Dispatch an assymetric crypto request. 915 */ 916 static int 917 crypto_kinvoke(struct cryptkop *krp, int crid) 918 { 919 struct cryptocap *cap = NULL; 920 int error; 921 922 KASSERT(krp != NULL, ("%s: krp == NULL", __func__)); 923 KASSERT(krp->krp_callback != NULL, 924 ("%s: krp->crp_callback == NULL", __func__)); 925 926 CRYPTO_DRIVER_LOCK(); 927 if ((crid & (CRYPTOCAP_F_HARDWARE | CRYPTOCAP_F_SOFTWARE)) == 0) { 928 cap = crypto_checkdriver(crid); 929 if (cap != NULL) { 930 /* 931 * Driver present, it must support the necessary 932 * algorithm and, if s/w drivers are excluded, 933 * it must be registered as hardware-backed. 934 */ 935 if (!kdriver_suitable(cap, krp) || 936 (!crypto_devallowsoft && 937 (cap->cc_flags & CRYPTOCAP_F_HARDWARE) == 0)) 938 cap = NULL; 939 } 940 } else { 941 /* 942 * No requested driver; select based on crid flags. 943 */ 944 if (!crypto_devallowsoft) /* NB: disallow s/w drivers */ 945 crid &= ~CRYPTOCAP_F_SOFTWARE; 946 cap = crypto_select_kdriver(krp, crid); 947 } 948 if (cap != NULL && !cap->cc_kqblocked) { 949 krp->krp_hid = cap - crypto_drivers; 950 cap->cc_koperations++; 951 CRYPTO_DRIVER_UNLOCK(); 952 error = CRYPTODEV_KPROCESS(cap->cc_dev, krp, 0); 953 CRYPTO_DRIVER_LOCK(); 954 if (error == ERESTART) { 955 cap->cc_koperations--; 956 CRYPTO_DRIVER_UNLOCK(); 957 return (error); 958 } 959 } else { 960 /* 961 * NB: cap is !NULL if device is blocked; in 962 * that case return ERESTART so the operation 963 * is resubmitted if possible. 964 */ 965 error = (cap == NULL) ? ENODEV : ERESTART; 966 } 967 CRYPTO_DRIVER_UNLOCK(); 968 969 if (error) { 970 krp->krp_status = error; 971 crypto_kdone(krp); 972 } 973 return 0; 974 } 975 976 #ifdef CRYPTO_TIMING 977 static void 978 crypto_tstat(struct cryptotstat *ts, struct bintime *bt) 979 { 980 struct bintime now, delta; 981 struct timespec t; 982 uint64_t u; 983 984 binuptime(&now); 985 u = now.frac; 986 delta.frac = now.frac - bt->frac; 987 delta.sec = now.sec - bt->sec; 988 if (u < delta.frac) 989 delta.sec--; 990 bintime2timespec(&delta, &t); 991 timespecadd(&ts->acc, &t); 992 if (timespeccmp(&t, &ts->min, <)) 993 ts->min = t; 994 if (timespeccmp(&t, &ts->max, >)) 995 ts->max = t; 996 ts->count++; 997 998 *bt = now; 999 } 1000 #endif 1001 1002 /* 1003 * Dispatch a crypto request to the appropriate crypto devices. 1004 */ 1005 static int 1006 crypto_invoke(struct cryptocap *cap, struct cryptop *crp, int hint) 1007 { 1008 1009 KASSERT(crp != NULL, ("%s: crp == NULL", __func__)); 1010 KASSERT(crp->crp_callback != NULL, 1011 ("%s: crp->crp_callback == NULL", __func__)); 1012 KASSERT(crp->crp_desc != NULL, ("%s: crp->crp_desc == NULL", __func__)); 1013 1014 #ifdef CRYPTO_TIMING 1015 if (crypto_timing) 1016 crypto_tstat(&cryptostats.cs_invoke, &crp->crp_tstamp); 1017 #endif 1018 if (cap->cc_flags & CRYPTOCAP_F_CLEANUP) { 1019 struct cryptodesc *crd; 1020 u_int64_t nid; 1021 1022 /* 1023 * Driver has unregistered; migrate the session and return 1024 * an error to the caller so they'll resubmit the op. 1025 * 1026 * XXX: What if there are more already queued requests for this 1027 * session? 1028 */ 1029 crypto_freesession(crp->crp_sid); 1030 1031 for (crd = crp->crp_desc; crd->crd_next; crd = crd->crd_next) 1032 crd->CRD_INI.cri_next = &(crd->crd_next->CRD_INI); 1033 1034 /* XXX propagate flags from initial session? */ 1035 if (crypto_newsession(&nid, &(crp->crp_desc->CRD_INI), 1036 CRYPTOCAP_F_HARDWARE | CRYPTOCAP_F_SOFTWARE) == 0) 1037 crp->crp_sid = nid; 1038 1039 crp->crp_etype = EAGAIN; 1040 crypto_done(crp); 1041 return 0; 1042 } else { 1043 /* 1044 * Invoke the driver to process the request. 1045 */ 1046 return CRYPTODEV_PROCESS(cap->cc_dev, crp, hint); 1047 } 1048 } 1049 1050 /* 1051 * Release a set of crypto descriptors. 1052 */ 1053 void 1054 crypto_freereq(struct cryptop *crp) 1055 { 1056 struct cryptodesc *crd; 1057 1058 if (crp == NULL) 1059 return; 1060 1061 #ifdef DIAGNOSTIC 1062 { 1063 struct cryptop *crp2; 1064 1065 CRYPTO_Q_LOCK(); 1066 TAILQ_FOREACH(crp2, &crp_q, crp_next) { 1067 KASSERT(crp2 != crp, 1068 ("Freeing cryptop from the crypto queue (%p).", 1069 crp)); 1070 } 1071 CRYPTO_Q_UNLOCK(); 1072 CRYPTO_RETQ_LOCK(); 1073 TAILQ_FOREACH(crp2, &crp_ret_q, crp_next) { 1074 KASSERT(crp2 != crp, 1075 ("Freeing cryptop from the return queue (%p).", 1076 crp)); 1077 } 1078 CRYPTO_RETQ_UNLOCK(); 1079 } 1080 #endif 1081 1082 while ((crd = crp->crp_desc) != NULL) { 1083 crp->crp_desc = crd->crd_next; 1084 uma_zfree(cryptodesc_zone, crd); 1085 } 1086 uma_zfree(cryptop_zone, crp); 1087 } 1088 1089 /* 1090 * Acquire a set of crypto descriptors. 1091 */ 1092 struct cryptop * 1093 crypto_getreq(int num) 1094 { 1095 struct cryptodesc *crd; 1096 struct cryptop *crp; 1097 1098 crp = uma_zalloc(cryptop_zone, M_NOWAIT|M_ZERO); 1099 if (crp != NULL) { 1100 while (num--) { 1101 crd = uma_zalloc(cryptodesc_zone, M_NOWAIT|M_ZERO); 1102 if (crd == NULL) { 1103 crypto_freereq(crp); 1104 return NULL; 1105 } 1106 1107 crd->crd_next = crp->crp_desc; 1108 crp->crp_desc = crd; 1109 } 1110 } 1111 return crp; 1112 } 1113 1114 /* 1115 * Invoke the callback on behalf of the driver. 1116 */ 1117 void 1118 crypto_done(struct cryptop *crp) 1119 { 1120 KASSERT((crp->crp_flags & CRYPTO_F_DONE) == 0, 1121 ("crypto_done: op already done, flags 0x%x", crp->crp_flags)); 1122 crp->crp_flags |= CRYPTO_F_DONE; 1123 if (crp->crp_etype != 0) 1124 cryptostats.cs_errs++; 1125 #ifdef CRYPTO_TIMING 1126 if (crypto_timing) 1127 crypto_tstat(&cryptostats.cs_done, &crp->crp_tstamp); 1128 #endif 1129 /* 1130 * CBIMM means unconditionally do the callback immediately; 1131 * CBIFSYNC means do the callback immediately only if the 1132 * operation was done synchronously. Both are used to avoid 1133 * doing extraneous context switches; the latter is mostly 1134 * used with the software crypto driver. 1135 */ 1136 if ((crp->crp_flags & CRYPTO_F_CBIMM) || 1137 ((crp->crp_flags & CRYPTO_F_CBIFSYNC) && 1138 (CRYPTO_SESID2CAPS(crp->crp_sid) & CRYPTOCAP_F_SYNC))) { 1139 /* 1140 * Do the callback directly. This is ok when the 1141 * callback routine does very little (e.g. the 1142 * /dev/crypto callback method just does a wakeup). 1143 */ 1144 #ifdef CRYPTO_TIMING 1145 if (crypto_timing) { 1146 /* 1147 * NB: We must copy the timestamp before 1148 * doing the callback as the cryptop is 1149 * likely to be reclaimed. 1150 */ 1151 struct bintime t = crp->crp_tstamp; 1152 crypto_tstat(&cryptostats.cs_cb, &t); 1153 crp->crp_callback(crp); 1154 crypto_tstat(&cryptostats.cs_finis, &t); 1155 } else 1156 #endif 1157 crp->crp_callback(crp); 1158 } else { 1159 /* 1160 * Normal case; queue the callback for the thread. 1161 */ 1162 CRYPTO_RETQ_LOCK(); 1163 if (CRYPTO_RETQ_EMPTY()) 1164 wakeup_one(&crp_ret_q); /* shared wait channel */ 1165 TAILQ_INSERT_TAIL(&crp_ret_q, crp, crp_next); 1166 CRYPTO_RETQ_UNLOCK(); 1167 } 1168 } 1169 1170 /* 1171 * Invoke the callback on behalf of the driver. 1172 */ 1173 void 1174 crypto_kdone(struct cryptkop *krp) 1175 { 1176 struct cryptocap *cap; 1177 1178 if (krp->krp_status != 0) 1179 cryptostats.cs_kerrs++; 1180 CRYPTO_DRIVER_LOCK(); 1181 /* XXX: What if driver is loaded in the meantime? */ 1182 if (krp->krp_hid < crypto_drivers_num) { 1183 cap = &crypto_drivers[krp->krp_hid]; 1184 KASSERT(cap->cc_koperations > 0, ("cc_koperations == 0")); 1185 cap->cc_koperations--; 1186 if (cap->cc_flags & CRYPTOCAP_F_CLEANUP) 1187 crypto_remove(cap); 1188 } 1189 CRYPTO_DRIVER_UNLOCK(); 1190 CRYPTO_RETQ_LOCK(); 1191 if (CRYPTO_RETQ_EMPTY()) 1192 wakeup_one(&crp_ret_q); /* shared wait channel */ 1193 TAILQ_INSERT_TAIL(&crp_ret_kq, krp, krp_next); 1194 CRYPTO_RETQ_UNLOCK(); 1195 } 1196 1197 int 1198 crypto_getfeat(int *featp) 1199 { 1200 int hid, kalg, feat = 0; 1201 1202 CRYPTO_DRIVER_LOCK(); 1203 for (hid = 0; hid < crypto_drivers_num; hid++) { 1204 const struct cryptocap *cap = &crypto_drivers[hid]; 1205 1206 if ((cap->cc_flags & CRYPTOCAP_F_SOFTWARE) && 1207 !crypto_devallowsoft) { 1208 continue; 1209 } 1210 for (kalg = 0; kalg < CRK_ALGORITHM_MAX; kalg++) 1211 if (cap->cc_kalg[kalg] & CRYPTO_ALG_FLAG_SUPPORTED) 1212 feat |= 1 << kalg; 1213 } 1214 CRYPTO_DRIVER_UNLOCK(); 1215 *featp = feat; 1216 return (0); 1217 } 1218 1219 /* 1220 * Terminate a thread at module unload. The process that 1221 * initiated this is waiting for us to signal that we're gone; 1222 * wake it up and exit. We use the driver table lock to insure 1223 * we don't do the wakeup before they're waiting. There is no 1224 * race here because the waiter sleeps on the proc lock for the 1225 * thread so it gets notified at the right time because of an 1226 * extra wakeup that's done in exit1(). 1227 */ 1228 static void 1229 crypto_finis(void *chan) 1230 { 1231 CRYPTO_DRIVER_LOCK(); 1232 wakeup_one(chan); 1233 CRYPTO_DRIVER_UNLOCK(); 1234 kproc_exit(0); 1235 } 1236 1237 /* 1238 * Crypto thread, dispatches crypto requests. 1239 */ 1240 static void 1241 crypto_proc(void) 1242 { 1243 struct cryptop *crp, *submit; 1244 struct cryptkop *krp; 1245 struct cryptocap *cap; 1246 u_int32_t hid; 1247 int result, hint; 1248 1249 #if defined(__i386__) || defined(__amd64__) 1250 fpu_kern_thread(FPU_KERN_NORMAL); 1251 #endif 1252 1253 CRYPTO_Q_LOCK(); 1254 for (;;) { 1255 /* 1256 * Find the first element in the queue that can be 1257 * processed and look-ahead to see if multiple ops 1258 * are ready for the same driver. 1259 */ 1260 submit = NULL; 1261 hint = 0; 1262 TAILQ_FOREACH(crp, &crp_q, crp_next) { 1263 hid = CRYPTO_SESID2HID(crp->crp_sid); 1264 cap = crypto_checkdriver(hid); 1265 /* 1266 * Driver cannot disappeared when there is an active 1267 * session. 1268 */ 1269 KASSERT(cap != NULL, ("%s:%u Driver disappeared.", 1270 __func__, __LINE__)); 1271 if (cap == NULL || cap->cc_dev == NULL) { 1272 /* Op needs to be migrated, process it. */ 1273 if (submit == NULL) 1274 submit = crp; 1275 break; 1276 } 1277 if (!cap->cc_qblocked) { 1278 if (submit != NULL) { 1279 /* 1280 * We stop on finding another op, 1281 * regardless whether its for the same 1282 * driver or not. We could keep 1283 * searching the queue but it might be 1284 * better to just use a per-driver 1285 * queue instead. 1286 */ 1287 if (CRYPTO_SESID2HID(submit->crp_sid) == hid) 1288 hint = CRYPTO_HINT_MORE; 1289 break; 1290 } else { 1291 submit = crp; 1292 if ((submit->crp_flags & CRYPTO_F_BATCH) == 0) 1293 break; 1294 /* keep scanning for more are q'd */ 1295 } 1296 } 1297 } 1298 if (submit != NULL) { 1299 TAILQ_REMOVE(&crp_q, submit, crp_next); 1300 hid = CRYPTO_SESID2HID(submit->crp_sid); 1301 cap = crypto_checkdriver(hid); 1302 KASSERT(cap != NULL, ("%s:%u Driver disappeared.", 1303 __func__, __LINE__)); 1304 result = crypto_invoke(cap, submit, hint); 1305 if (result == ERESTART) { 1306 /* 1307 * The driver ran out of resources, mark the 1308 * driver ``blocked'' for cryptop's and put 1309 * the request back in the queue. It would 1310 * best to put the request back where we got 1311 * it but that's hard so for now we put it 1312 * at the front. This should be ok; putting 1313 * it at the end does not work. 1314 */ 1315 /* XXX validate sid again? */ 1316 crypto_drivers[CRYPTO_SESID2HID(submit->crp_sid)].cc_qblocked = 1; 1317 TAILQ_INSERT_HEAD(&crp_q, submit, crp_next); 1318 cryptostats.cs_blocks++; 1319 } 1320 } 1321 1322 /* As above, but for key ops */ 1323 TAILQ_FOREACH(krp, &crp_kq, krp_next) { 1324 cap = crypto_checkdriver(krp->krp_hid); 1325 if (cap == NULL || cap->cc_dev == NULL) { 1326 /* 1327 * Operation needs to be migrated, invalidate 1328 * the assigned device so it will reselect a 1329 * new one below. Propagate the original 1330 * crid selection flags if supplied. 1331 */ 1332 krp->krp_hid = krp->krp_crid & 1333 (CRYPTOCAP_F_SOFTWARE|CRYPTOCAP_F_HARDWARE); 1334 if (krp->krp_hid == 0) 1335 krp->krp_hid = 1336 CRYPTOCAP_F_SOFTWARE|CRYPTOCAP_F_HARDWARE; 1337 break; 1338 } 1339 if (!cap->cc_kqblocked) 1340 break; 1341 } 1342 if (krp != NULL) { 1343 TAILQ_REMOVE(&crp_kq, krp, krp_next); 1344 result = crypto_kinvoke(krp, krp->krp_hid); 1345 if (result == ERESTART) { 1346 /* 1347 * The driver ran out of resources, mark the 1348 * driver ``blocked'' for cryptkop's and put 1349 * the request back in the queue. It would 1350 * best to put the request back where we got 1351 * it but that's hard so for now we put it 1352 * at the front. This should be ok; putting 1353 * it at the end does not work. 1354 */ 1355 /* XXX validate sid again? */ 1356 crypto_drivers[krp->krp_hid].cc_kqblocked = 1; 1357 TAILQ_INSERT_HEAD(&crp_kq, krp, krp_next); 1358 cryptostats.cs_kblocks++; 1359 } 1360 } 1361 1362 if (submit == NULL && krp == NULL) { 1363 /* 1364 * Nothing more to be processed. Sleep until we're 1365 * woken because there are more ops to process. 1366 * This happens either by submission or by a driver 1367 * becoming unblocked and notifying us through 1368 * crypto_unblock. Note that when we wakeup we 1369 * start processing each queue again from the 1370 * front. It's not clear that it's important to 1371 * preserve this ordering since ops may finish 1372 * out of order if dispatched to different devices 1373 * and some become blocked while others do not. 1374 */ 1375 crp_sleep = 1; 1376 msleep(&crp_q, &crypto_q_mtx, PWAIT, "crypto_wait", 0); 1377 crp_sleep = 0; 1378 if (cryptoproc == NULL) 1379 break; 1380 cryptostats.cs_intrs++; 1381 } 1382 } 1383 CRYPTO_Q_UNLOCK(); 1384 1385 crypto_finis(&crp_q); 1386 } 1387 1388 /* 1389 * Crypto returns thread, does callbacks for processed crypto requests. 1390 * Callbacks are done here, rather than in the crypto drivers, because 1391 * callbacks typically are expensive and would slow interrupt handling. 1392 */ 1393 static void 1394 crypto_ret_proc(void) 1395 { 1396 struct cryptop *crpt; 1397 struct cryptkop *krpt; 1398 1399 CRYPTO_RETQ_LOCK(); 1400 for (;;) { 1401 /* Harvest return q's for completed ops */ 1402 crpt = TAILQ_FIRST(&crp_ret_q); 1403 if (crpt != NULL) 1404 TAILQ_REMOVE(&crp_ret_q, crpt, crp_next); 1405 1406 krpt = TAILQ_FIRST(&crp_ret_kq); 1407 if (krpt != NULL) 1408 TAILQ_REMOVE(&crp_ret_kq, krpt, krp_next); 1409 1410 if (crpt != NULL || krpt != NULL) { 1411 CRYPTO_RETQ_UNLOCK(); 1412 /* 1413 * Run callbacks unlocked. 1414 */ 1415 if (crpt != NULL) { 1416 #ifdef CRYPTO_TIMING 1417 if (crypto_timing) { 1418 /* 1419 * NB: We must copy the timestamp before 1420 * doing the callback as the cryptop is 1421 * likely to be reclaimed. 1422 */ 1423 struct bintime t = crpt->crp_tstamp; 1424 crypto_tstat(&cryptostats.cs_cb, &t); 1425 crpt->crp_callback(crpt); 1426 crypto_tstat(&cryptostats.cs_finis, &t); 1427 } else 1428 #endif 1429 crpt->crp_callback(crpt); 1430 } 1431 if (krpt != NULL) 1432 krpt->krp_callback(krpt); 1433 CRYPTO_RETQ_LOCK(); 1434 } else { 1435 /* 1436 * Nothing more to be processed. Sleep until we're 1437 * woken because there are more returns to process. 1438 */ 1439 msleep(&crp_ret_q, &crypto_ret_q_mtx, PWAIT, 1440 "crypto_ret_wait", 0); 1441 if (cryptoretproc == NULL) 1442 break; 1443 cryptostats.cs_rets++; 1444 } 1445 } 1446 CRYPTO_RETQ_UNLOCK(); 1447 1448 crypto_finis(&crp_ret_q); 1449 } 1450 1451 #ifdef DDB 1452 static void 1453 db_show_drivers(void) 1454 { 1455 int hid; 1456 1457 db_printf("%12s %4s %4s %8s %2s %2s\n" 1458 , "Device" 1459 , "Ses" 1460 , "Kops" 1461 , "Flags" 1462 , "QB" 1463 , "KB" 1464 ); 1465 for (hid = 0; hid < crypto_drivers_num; hid++) { 1466 const struct cryptocap *cap = &crypto_drivers[hid]; 1467 if (cap->cc_dev == NULL) 1468 continue; 1469 db_printf("%-12s %4u %4u %08x %2u %2u\n" 1470 , device_get_nameunit(cap->cc_dev) 1471 , cap->cc_sessions 1472 , cap->cc_koperations 1473 , cap->cc_flags 1474 , cap->cc_qblocked 1475 , cap->cc_kqblocked 1476 ); 1477 } 1478 } 1479 1480 DB_SHOW_COMMAND(crypto, db_show_crypto) 1481 { 1482 struct cryptop *crp; 1483 1484 db_show_drivers(); 1485 db_printf("\n"); 1486 1487 db_printf("%4s %8s %4s %4s %4s %4s %8s %8s\n", 1488 "HID", "Caps", "Ilen", "Olen", "Etype", "Flags", 1489 "Desc", "Callback"); 1490 TAILQ_FOREACH(crp, &crp_q, crp_next) { 1491 db_printf("%4u %08x %4u %4u %4u %04x %8p %8p\n" 1492 , (int) CRYPTO_SESID2HID(crp->crp_sid) 1493 , (int) CRYPTO_SESID2CAPS(crp->crp_sid) 1494 , crp->crp_ilen, crp->crp_olen 1495 , crp->crp_etype 1496 , crp->crp_flags 1497 , crp->crp_desc 1498 , crp->crp_callback 1499 ); 1500 } 1501 if (!TAILQ_EMPTY(&crp_ret_q)) { 1502 db_printf("\n%4s %4s %4s %8s\n", 1503 "HID", "Etype", "Flags", "Callback"); 1504 TAILQ_FOREACH(crp, &crp_ret_q, crp_next) { 1505 db_printf("%4u %4u %04x %8p\n" 1506 , (int) CRYPTO_SESID2HID(crp->crp_sid) 1507 , crp->crp_etype 1508 , crp->crp_flags 1509 , crp->crp_callback 1510 ); 1511 } 1512 } 1513 } 1514 1515 DB_SHOW_COMMAND(kcrypto, db_show_kcrypto) 1516 { 1517 struct cryptkop *krp; 1518 1519 db_show_drivers(); 1520 db_printf("\n"); 1521 1522 db_printf("%4s %5s %4s %4s %8s %4s %8s\n", 1523 "Op", "Status", "#IP", "#OP", "CRID", "HID", "Callback"); 1524 TAILQ_FOREACH(krp, &crp_kq, krp_next) { 1525 db_printf("%4u %5u %4u %4u %08x %4u %8p\n" 1526 , krp->krp_op 1527 , krp->krp_status 1528 , krp->krp_iparams, krp->krp_oparams 1529 , krp->krp_crid, krp->krp_hid 1530 , krp->krp_callback 1531 ); 1532 } 1533 if (!TAILQ_EMPTY(&crp_ret_q)) { 1534 db_printf("%4s %5s %8s %4s %8s\n", 1535 "Op", "Status", "CRID", "HID", "Callback"); 1536 TAILQ_FOREACH(krp, &crp_ret_kq, krp_next) { 1537 db_printf("%4u %5u %08x %4u %8p\n" 1538 , krp->krp_op 1539 , krp->krp_status 1540 , krp->krp_crid, krp->krp_hid 1541 , krp->krp_callback 1542 ); 1543 } 1544 } 1545 } 1546 #endif 1547 1548 int crypto_modevent(module_t mod, int type, void *unused); 1549 1550 /* 1551 * Initialization code, both for static and dynamic loading. 1552 * Note this is not invoked with the usual MODULE_DECLARE 1553 * mechanism but instead is listed as a dependency by the 1554 * cryptosoft driver. This guarantees proper ordering of 1555 * calls on module load/unload. 1556 */ 1557 int 1558 crypto_modevent(module_t mod, int type, void *unused) 1559 { 1560 int error = EINVAL; 1561 1562 switch (type) { 1563 case MOD_LOAD: 1564 error = crypto_init(); 1565 if (error == 0 && bootverbose) 1566 printf("crypto: <crypto core>\n"); 1567 break; 1568 case MOD_UNLOAD: 1569 /*XXX disallow if active sessions */ 1570 error = 0; 1571 crypto_destroy(); 1572 return 0; 1573 } 1574 return error; 1575 } 1576 MODULE_VERSION(crypto, 1); 1577 MODULE_DEPEND(crypto, zlib, 1, 1, 1); 1578