1 /* $FreeBSD: src/sys/opencrypto/crypto.c,v 1.28 2007/10/20 23:23:22 julian Exp $ */
3 * Copyright (c) 2002-2006 Sam Leffler. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
17 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 * Cryptographic Subsystem.
29 * This code is derived from the Openbsd Cryptographic Framework (OCF)
30 * that has the copyright shown below. Very little of the original
35 * The author of this code is Angelos D. Keromytis (angelos@cis.upenn.edu)
37 * This code was written by Angelos D. Keromytis in Athens, Greece, in
38 * February 2000. Network Security Technologies Inc. (NSTI) kindly
39 * supported the development of this code.
41 * Copyright (c) 2000, 2001 Angelos D. Keromytis
43 * Permission to use, copy, and modify this software with or without fee
44 * is hereby granted, provided that this entire notice is included in
45 * all source code copies of any software which is or includes a copy or
46 * modification of this software.
48 * THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR
49 * IMPLIED WARRANTY. IN PARTICULAR, NONE OF THE AUTHORS MAKES ANY
50 * REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE
51 * MERCHANTABILITY OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR
55 #define CRYPTO_TIMING /* enable timing support */
59 #include <sys/param.h>
60 #include <sys/systm.h>
61 #include <sys/eventhandler.h>
62 #include <sys/kernel.h>
63 #include <sys/kthread.h>
65 #include <sys/module.h>
66 #include <sys/malloc.h>
68 #include <sys/sysctl.h>
69 #include <sys/objcache.h>
71 #include <sys/thread2.h>
72 #include <sys/mplock2.h>
76 #include <opencrypto/cryptodev.h>
77 #include <opencrypto/xform.h> /* XXX for M_XDATA */
81 #include "cryptodev_if.h"
84 * Crypto drivers register themselves by allocating a slot in the
85 * crypto_drivers table with crypto_get_driverid() and then registering
86 * each algorithm they support with crypto_register() and crypto_kregister().
88 static struct lock crypto_drivers_lock; /* lock on driver table */
89 #define CRYPTO_DRIVER_LOCK() lockmgr(&crypto_drivers_lock, LK_EXCLUSIVE)
90 #define CRYPTO_DRIVER_UNLOCK() lockmgr(&crypto_drivers_lock, LK_RELEASE)
91 #define CRYPTO_DRIVER_ASSERT() KKASSERT(lockstatus(&crypto_drivers_lock, curthread) != 0)
94 * Crypto device/driver capabilities structure.
97 * (d) - protected by CRYPTO_DRIVER_LOCK()
98 * (q) - protected by CRYPTO_Q_LOCK()
99 * Not tagged fields are read-only.
102 device_t cc_dev; /* (d) device/driver */
103 u_int32_t cc_sessions; /* (d) # of sessions */
104 u_int32_t cc_koperations; /* (d) # os asym operations */
106 * Largest possible operator length (in bits) for each type of
107 * encryption algorithm. XXX not used
109 u_int16_t cc_max_op_len[CRYPTO_ALGORITHM_MAX + 1];
110 u_int8_t cc_alg[CRYPTO_ALGORITHM_MAX + 1];
111 u_int8_t cc_kalg[CRK_ALGORITHM_MAX + 1];
113 int cc_flags; /* (d) flags */
114 #define CRYPTOCAP_F_CLEANUP 0x80000000 /* needs resource cleanup */
115 int cc_qblocked; /* (q) symmetric q blocked */
116 int cc_kqblocked; /* (q) asymmetric q blocked */
118 static struct cryptocap *crypto_drivers = NULL;
119 static int crypto_drivers_num = 0;
121 typedef struct crypto_tdinfo {
122 TAILQ_HEAD(,cryptop) crp_q; /* request queues */
123 TAILQ_HEAD(,cryptkop) crp_kq;
125 struct lock crp_lock;
130 * There are two queues for crypto requests; one for symmetric (e.g.
131 * cipher) operations and one for asymmetric (e.g. MOD) operations.
132 * See below for how synchronization is handled.
133 * A single lock is used to lock access to both queues. We could
134 * have one per-queue but having one simplifies handling of block/unblock
137 static struct crypto_tdinfo tdinfo_array[MAXCPU];
139 #define CRYPTO_Q_LOCK(tdinfo) lockmgr(&tdinfo->crp_lock, LK_EXCLUSIVE)
140 #define CRYPTO_Q_UNLOCK(tdinfo) lockmgr(&tdinfo->crp_lock, LK_RELEASE)
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 * lock 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.
150 static TAILQ_HEAD(,cryptop) crp_ret_q; /* callback queues */
151 static TAILQ_HEAD(,cryptkop) crp_ret_kq;
152 static struct lock crypto_ret_q_lock;
153 #define CRYPTO_RETQ_LOCK() lockmgr(&crypto_ret_q_lock, LK_EXCLUSIVE)
154 #define CRYPTO_RETQ_UNLOCK() lockmgr(&crypto_ret_q_lock, LK_RELEASE)
155 #define CRYPTO_RETQ_EMPTY() (TAILQ_EMPTY(&crp_ret_q) && TAILQ_EMPTY(&crp_ret_kq))
158 * Crypto op and desciptor data structures are allocated
159 * from separate object caches.
161 static struct objcache *cryptop_oc, *cryptodesc_oc;
163 static MALLOC_DEFINE(M_CRYPTO_OP, "crypto op", "crypto op");
164 static MALLOC_DEFINE(M_CRYPTO_DESC, "crypto desc", "crypto desc");
166 int crypto_userasymcrypto = 1; /* userland may do asym crypto reqs */
167 SYSCTL_INT(_kern, OID_AUTO, userasymcrypto, CTLFLAG_RW,
168 &crypto_userasymcrypto, 0,
169 "Enable/disable user-mode access to asymmetric crypto support");
170 int crypto_devallowsoft = 0; /* only use hardware crypto for asym */
171 SYSCTL_INT(_kern, OID_AUTO, cryptodevallowsoft, CTLFLAG_RW,
172 &crypto_devallowsoft, 0,
173 "Enable/disable use of software asym crypto support");
174 int crypto_altdispatch = 0; /* dispatch to alternative cpu */
175 SYSCTL_INT(_kern, OID_AUTO, cryptoaltdispatch, CTLFLAG_RW,
176 &crypto_altdispatch, 0,
177 "Do not queue crypto op on current cpu");
179 MALLOC_DEFINE(M_CRYPTO_DATA, "crypto", "crypto session records");
181 static void crypto_proc(void *dummy);
182 static void crypto_ret_proc(void *dummy);
183 static struct thread *cryptoretthread;
184 static void crypto_destroy(void);
185 static int crypto_invoke(struct cryptocap *cap, struct cryptop *crp, int hint);
186 static int crypto_kinvoke(struct cryptkop *krp, int flags);
188 static struct cryptostats cryptostats;
189 SYSCTL_STRUCT(_kern, OID_AUTO, crypto_stats, CTLFLAG_RW, &cryptostats,
190 cryptostats, "Crypto system statistics");
193 static int crypto_timing = 0;
194 SYSCTL_INT(_debug, OID_AUTO, crypto_timing, CTLFLAG_RW,
195 &crypto_timing, 0, "Enable/disable crypto timing support");
201 crypto_tdinfo_t tdinfo;
205 lockinit(&crypto_drivers_lock, "crypto driver table", 0, LK_CANRECURSE);
207 TAILQ_INIT(&crp_ret_q);
208 TAILQ_INIT(&crp_ret_kq);
209 lockinit(&crypto_ret_q_lock, "crypto return queues", 0, LK_CANRECURSE);
211 cryptop_oc = objcache_create_simple(M_CRYPTO_OP, sizeof(struct cryptop));
212 cryptodesc_oc = objcache_create_simple(M_CRYPTO_DESC,
213 sizeof(struct cryptodesc));
214 if (cryptodesc_oc == NULL || cryptop_oc == NULL) {
215 kprintf("crypto_init: cannot setup crypto caches\n");
220 crypto_drivers_num = CRYPTO_DRIVERS_INITIAL;
221 crypto_drivers = kmalloc(crypto_drivers_num * sizeof(struct cryptocap),
222 M_CRYPTO_DATA, M_WAITOK | M_ZERO);
223 if (crypto_drivers == NULL) {
224 kprintf("crypto_init: cannot malloc driver table\n");
229 for (n = 0; n < ncpus; ++n) {
230 tdinfo = &tdinfo_array[n];
231 TAILQ_INIT(&tdinfo->crp_q);
232 TAILQ_INIT(&tdinfo->crp_kq);
233 lockinit(&tdinfo->crp_lock, "crypto op queues",
235 kthread_create_cpu(crypto_proc, tdinfo, &tdinfo->crp_td,
238 kthread_create(crypto_ret_proc, NULL,
239 &cryptoretthread, "crypto returns");
247 * Signal a crypto thread to terminate. We use the driver
248 * table lock to synchronize the sleep/wakeups so that we
249 * are sure the threads have terminated before we release
250 * the data structures they use. See crypto_finis below
251 * for the other half of this song-and-dance.
254 crypto_terminate(struct thread **tp, void *q)
258 KKASSERT(lockstatus(&crypto_drivers_lock, curthread) != 0);
262 kprintf("crypto_terminate: start\n");
265 tsleep_interlock(t, 0);
266 CRYPTO_DRIVER_UNLOCK(); /* let crypto_finis progress */
268 tsleep(t, PINTERLOCKED, "crypto_destroy", 0);
269 CRYPTO_DRIVER_LOCK();
270 kprintf("crypto_terminate: end\n");
277 crypto_tdinfo_t tdinfo;
281 * Terminate any crypto threads.
283 CRYPTO_DRIVER_LOCK();
284 for (n = 0; n < ncpus; ++n) {
285 tdinfo = &tdinfo_array[n];
286 crypto_terminate(&tdinfo->crp_td, &tdinfo->crp_q);
287 lockuninit(&tdinfo->crp_lock);
289 crypto_terminate(&cryptoretthread, &crp_ret_q);
290 CRYPTO_DRIVER_UNLOCK();
292 /* XXX flush queues??? */
295 * Reclaim dynamically allocated resources.
297 if (crypto_drivers != NULL)
298 kfree(crypto_drivers, M_CRYPTO_DATA);
300 if (cryptodesc_oc != NULL)
301 objcache_destroy(cryptodesc_oc);
302 if (cryptop_oc != NULL)
303 objcache_destroy(cryptop_oc);
304 lockuninit(&crypto_ret_q_lock);
305 lockuninit(&crypto_drivers_lock);
308 static struct cryptocap *
309 crypto_checkdriver(u_int32_t hid)
311 if (crypto_drivers == NULL)
313 return (hid >= crypto_drivers_num ? NULL : &crypto_drivers[hid]);
317 * Compare a driver's list of supported algorithms against another
318 * list; return non-zero if all algorithms are supported.
321 driver_suitable(const struct cryptocap *cap, const struct cryptoini *cri)
323 const struct cryptoini *cr;
325 /* See if all the algorithms are supported. */
326 for (cr = cri; cr; cr = cr->cri_next)
327 if (cap->cc_alg[cr->cri_alg] == 0)
333 * Select a driver for a new session that supports the specified
334 * algorithms and, optionally, is constrained according to the flags.
335 * The algorithm we use here is pretty stupid; just use the
336 * first driver that supports all the algorithms we need. If there
337 * are multiple drivers we choose the driver with the fewest active
338 * sessions. We prefer hardware-backed drivers to software ones.
340 * XXX We need more smarts here (in real life too, but that's
341 * XXX another story altogether).
343 static struct cryptocap *
344 crypto_select_driver(const struct cryptoini *cri, int flags)
346 struct cryptocap *cap, *best;
349 CRYPTO_DRIVER_ASSERT();
352 * Look first for hardware crypto devices if permitted.
354 if (flags & CRYPTOCAP_F_HARDWARE)
355 match = CRYPTOCAP_F_HARDWARE;
357 match = CRYPTOCAP_F_SOFTWARE;
360 for (hid = 0; hid < crypto_drivers_num; hid++) {
361 cap = &crypto_drivers[hid];
363 * If it's not initialized, is in the process of
364 * going away, or is not appropriate (hardware
365 * or software based on match), then skip.
367 if (cap->cc_dev == NULL ||
368 (cap->cc_flags & CRYPTOCAP_F_CLEANUP) ||
369 (cap->cc_flags & match) == 0)
372 /* verify all the algorithms are supported. */
373 if (driver_suitable(cap, cri)) {
375 cap->cc_sessions < best->cc_sessions)
381 if (match == CRYPTOCAP_F_HARDWARE && (flags & CRYPTOCAP_F_SOFTWARE)) {
382 /* sort of an Algol 68-style for loop */
383 match = CRYPTOCAP_F_SOFTWARE;
390 * Create a new session. The crid argument specifies a crypto
391 * driver to use or constraints on a driver to select (hardware
392 * only, software only, either). Whatever driver is selected
393 * must be capable of the requested crypto algorithms.
396 crypto_newsession(u_int64_t *sid, struct cryptoini *cri, int crid)
398 struct cryptocap *cap;
402 CRYPTO_DRIVER_LOCK();
403 if ((crid & (CRYPTOCAP_F_HARDWARE | CRYPTOCAP_F_SOFTWARE)) == 0) {
405 * Use specified driver; verify it is capable.
407 cap = crypto_checkdriver(crid);
408 if (cap != NULL && !driver_suitable(cap, cri))
412 * No requested driver; select based on crid flags.
414 cap = crypto_select_driver(cri, crid);
416 * if NULL then can't do everything in one session.
417 * XXX Fix this. We need to inject a "virtual" session
418 * XXX layer right about here.
422 /* Call the driver initialization routine. */
423 hid = cap - crypto_drivers;
424 lid = hid; /* Pass the driver ID. */
425 err = CRYPTODEV_NEWSESSION(cap->cc_dev, &lid, cri);
427 (*sid) = (cap->cc_flags & 0xff000000)
428 | (hid & 0x00ffffff);
430 (*sid) |= (lid & 0xffffffff);
435 CRYPTO_DRIVER_UNLOCK();
440 crypto_remove(struct cryptocap *cap)
443 KKASSERT(lockstatus(&crypto_drivers_lock, curthread) != 0);
444 if (cap->cc_sessions == 0 && cap->cc_koperations == 0)
445 bzero(cap, sizeof(*cap));
449 * Delete an existing session (or a reserved session on an unregistered
453 crypto_freesession(u_int64_t sid)
455 struct cryptocap *cap;
459 CRYPTO_DRIVER_LOCK();
461 if (crypto_drivers == NULL) {
466 /* Determine two IDs. */
467 hid = CRYPTO_SESID2HID(sid);
469 if (hid >= crypto_drivers_num) {
473 cap = &crypto_drivers[hid];
475 if (cap->cc_sessions)
478 /* Call the driver cleanup routine, if available. */
479 err = CRYPTODEV_FREESESSION(cap->cc_dev, sid);
481 if (cap->cc_flags & CRYPTOCAP_F_CLEANUP)
485 CRYPTO_DRIVER_UNLOCK();
490 * Return an unused driver id. Used by drivers prior to registering
491 * support for the algorithms they handle.
494 crypto_get_driverid(device_t dev, int flags)
496 struct cryptocap *newdrv;
499 if ((flags & (CRYPTOCAP_F_HARDWARE | CRYPTOCAP_F_SOFTWARE)) == 0) {
500 kprintf("%s: no flags specified when registering driver\n",
501 device_get_nameunit(dev));
505 CRYPTO_DRIVER_LOCK();
507 for (i = 0; i < crypto_drivers_num; i++) {
508 if (crypto_drivers[i].cc_dev == NULL &&
509 (crypto_drivers[i].cc_flags & CRYPTOCAP_F_CLEANUP) == 0) {
514 /* Out of entries, allocate some more. */
515 if (i == crypto_drivers_num) {
516 /* Be careful about wrap-around. */
517 if (2 * crypto_drivers_num <= crypto_drivers_num) {
518 CRYPTO_DRIVER_UNLOCK();
519 kprintf("crypto: driver count wraparound!\n");
523 newdrv = kmalloc(2 * crypto_drivers_num *
524 sizeof(struct cryptocap),
525 M_CRYPTO_DATA, M_WAITOK|M_ZERO);
526 if (newdrv == NULL) {
527 CRYPTO_DRIVER_UNLOCK();
528 kprintf("crypto: no space to expand driver table!\n");
532 bcopy(crypto_drivers, newdrv,
533 crypto_drivers_num * sizeof(struct cryptocap));
535 crypto_drivers_num *= 2;
537 kfree(crypto_drivers, M_CRYPTO_DATA);
538 crypto_drivers = newdrv;
541 /* NB: state is zero'd on free */
542 crypto_drivers[i].cc_sessions = 1; /* Mark */
543 crypto_drivers[i].cc_dev = dev;
544 crypto_drivers[i].cc_flags = flags;
546 kprintf("crypto: assign %s driver id %u, flags %u\n",
547 device_get_nameunit(dev), i, flags);
549 CRYPTO_DRIVER_UNLOCK();
555 * Lookup a driver by name. We match against the full device
556 * name and unit, and against just the name. The latter gives
557 * us a simple widlcarding by device name. On success return the
558 * driver/hardware identifier; otherwise return -1.
561 crypto_find_driver(const char *match)
563 int i, len = strlen(match);
565 CRYPTO_DRIVER_LOCK();
566 for (i = 0; i < crypto_drivers_num; i++) {
567 device_t dev = crypto_drivers[i].cc_dev;
569 (crypto_drivers[i].cc_flags & CRYPTOCAP_F_CLEANUP))
571 if (strncmp(match, device_get_nameunit(dev), len) == 0 ||
572 strncmp(match, device_get_name(dev), len) == 0)
575 CRYPTO_DRIVER_UNLOCK();
576 return i < crypto_drivers_num ? i : -1;
580 * Return the device_t for the specified driver or NULL
581 * if the driver identifier is invalid.
584 crypto_find_device_byhid(int hid)
586 struct cryptocap *cap = crypto_checkdriver(hid);
587 return cap != NULL ? cap->cc_dev : NULL;
591 * Return the device/driver capabilities.
594 crypto_getcaps(int hid)
596 struct cryptocap *cap = crypto_checkdriver(hid);
597 return cap != NULL ? cap->cc_flags : 0;
601 * Register support for a key-related algorithm. This routine
602 * is called once for each algorithm supported a driver.
605 crypto_kregister(u_int32_t driverid, int kalg, u_int32_t flags)
607 struct cryptocap *cap;
610 CRYPTO_DRIVER_LOCK();
612 cap = crypto_checkdriver(driverid);
614 (CRK_ALGORITM_MIN <= kalg && kalg <= CRK_ALGORITHM_MAX)) {
616 * XXX Do some performance testing to determine placing.
617 * XXX We probably need an auxiliary data structure that
618 * XXX describes relative performances.
621 cap->cc_kalg[kalg] = flags | CRYPTO_ALG_FLAG_SUPPORTED;
623 kprintf("crypto: %s registers key alg %u flags %u\n"
624 , device_get_nameunit(cap->cc_dev)
633 CRYPTO_DRIVER_UNLOCK();
638 * Register support for a non-key-related algorithm. This routine
639 * is called once for each such algorithm supported by a driver.
642 crypto_register(u_int32_t driverid, int alg, u_int16_t maxoplen,
645 struct cryptocap *cap;
648 CRYPTO_DRIVER_LOCK();
650 cap = crypto_checkdriver(driverid);
651 /* NB: algorithms are in the range [1..max] */
653 (CRYPTO_ALGORITHM_MIN <= alg && alg <= CRYPTO_ALGORITHM_MAX)) {
655 * XXX Do some performance testing to determine placing.
656 * XXX We probably need an auxiliary data structure that
657 * XXX describes relative performances.
660 cap->cc_alg[alg] = flags | CRYPTO_ALG_FLAG_SUPPORTED;
661 cap->cc_max_op_len[alg] = maxoplen;
663 kprintf("crypto: %s registers alg %u flags %u maxoplen %u\n"
664 , device_get_nameunit(cap->cc_dev)
669 cap->cc_sessions = 0; /* Unmark */
674 CRYPTO_DRIVER_UNLOCK();
679 driver_finis(struct cryptocap *cap)
683 CRYPTO_DRIVER_ASSERT();
685 ses = cap->cc_sessions;
686 kops = cap->cc_koperations;
687 bzero(cap, sizeof(*cap));
688 if (ses != 0 || kops != 0) {
690 * If there are pending sessions,
691 * just mark as invalid.
693 cap->cc_flags |= CRYPTOCAP_F_CLEANUP;
694 cap->cc_sessions = ses;
695 cap->cc_koperations = kops;
700 * Unregister a crypto driver. If there are pending sessions using it,
701 * leave enough information around so that subsequent calls using those
702 * sessions will correctly detect the driver has been unregistered and
706 crypto_unregister(u_int32_t driverid, int alg)
708 struct cryptocap *cap;
711 CRYPTO_DRIVER_LOCK();
712 cap = crypto_checkdriver(driverid);
714 (CRYPTO_ALGORITHM_MIN <= alg && alg <= CRYPTO_ALGORITHM_MAX) &&
715 cap->cc_alg[alg] != 0) {
716 cap->cc_alg[alg] = 0;
717 cap->cc_max_op_len[alg] = 0;
719 /* Was this the last algorithm ? */
720 for (i = 1; i <= CRYPTO_ALGORITHM_MAX; i++) {
721 if (cap->cc_alg[i] != 0)
725 if (i == CRYPTO_ALGORITHM_MAX + 1)
731 CRYPTO_DRIVER_UNLOCK();
737 * Unregister all algorithms associated with a crypto driver.
738 * If there are pending sessions using it, leave enough information
739 * around so that subsequent calls using those sessions will
740 * correctly detect the driver has been unregistered and reroute
744 crypto_unregister_all(u_int32_t driverid)
746 struct cryptocap *cap;
749 CRYPTO_DRIVER_LOCK();
750 cap = crypto_checkdriver(driverid);
757 CRYPTO_DRIVER_UNLOCK();
763 * Clear blockage on a driver. The what parameter indicates whether
764 * the driver is now ready for cryptop's and/or cryptokop's.
767 crypto_unblock(u_int32_t driverid, int what)
769 crypto_tdinfo_t tdinfo;
770 struct cryptocap *cap;
774 CRYPTO_DRIVER_LOCK();
775 cap = crypto_checkdriver(driverid);
777 if (what & CRYPTO_SYMQ)
778 cap->cc_qblocked = 0;
779 if (what & CRYPTO_ASYMQ)
780 cap->cc_kqblocked = 0;
781 for (n = 0; n < ncpus; ++n) {
782 tdinfo = &tdinfo_array[n];
783 CRYPTO_Q_LOCK(tdinfo);
784 if (tdinfo[n].crp_sleep)
785 wakeup_one(&tdinfo->crp_q);
786 CRYPTO_Q_UNLOCK(tdinfo);
792 CRYPTO_DRIVER_UNLOCK();
797 static volatile int dispatch_rover;
800 * Add a crypto request to a queue, to be processed by the kernel thread.
803 crypto_dispatch(struct cryptop *crp)
805 crypto_tdinfo_t tdinfo;
806 struct cryptocap *cap;
811 cryptostats.cs_ops++;
815 nanouptime(&crp->crp_tstamp);
818 hid = CRYPTO_SESID2HID(crp->crp_sid);
821 * Dispatch the crypto op directly to the driver if the caller
822 * marked the request to be processed immediately or this is
823 * a synchronous callback chain occuring from within a crypto
826 * Fall through to queueing the driver is blocked.
828 if ((crp->crp_flags & CRYPTO_F_BATCH) == 0 ||
829 (curthread->td_flags & TDF_CRYPTO)) {
830 cap = crypto_checkdriver(hid);
831 /* Driver cannot disappeared when there is an active session. */
832 KASSERT(cap != NULL, ("%s: Driver disappeared.", __func__));
833 if (!cap->cc_qblocked) {
834 result = crypto_invoke(cap, crp, 0);
835 if (result != ERESTART)
838 * The driver ran out of resources, put the request on
845 * Dispatch to a cpu for action if possible. Dispatch to a different
846 * cpu than the current cpu.
848 if (CRYPTO_SESID2CAPS(crp->crp_sid) & CRYPTOCAP_F_SMP) {
849 n = atomic_fetchadd_int(&dispatch_rover, 1) & 255;
850 if (crypto_altdispatch && mycpu->gd_cpuid == n)
856 tdinfo = &tdinfo_array[n];
858 CRYPTO_Q_LOCK(tdinfo);
859 TAILQ_INSERT_TAIL(&tdinfo->crp_q, crp, crp_next);
860 if (tdinfo->crp_sleep)
861 wakeup_one(&tdinfo->crp_q);
862 CRYPTO_Q_UNLOCK(tdinfo);
867 * Add an asymetric crypto request to a queue,
868 * to be processed by the kernel thread.
871 crypto_kdispatch(struct cryptkop *krp)
873 crypto_tdinfo_t tdinfo;
877 cryptostats.cs_kops++;
880 /* not sure how to test F_SMP here */
881 n = atomic_fetchadd_int(&dispatch_rover, 1) & 255;
885 tdinfo = &tdinfo_array[n];
887 error = crypto_kinvoke(krp, krp->krp_crid);
889 if (error == ERESTART) {
890 CRYPTO_Q_LOCK(tdinfo);
891 TAILQ_INSERT_TAIL(&tdinfo->crp_kq, krp, krp_next);
892 if (tdinfo->crp_sleep)
893 wakeup_one(&tdinfo->crp_q);
894 CRYPTO_Q_UNLOCK(tdinfo);
901 * Verify a driver is suitable for the specified operation.
904 kdriver_suitable(const struct cryptocap *cap, const struct cryptkop *krp)
906 return (cap->cc_kalg[krp->krp_op] & CRYPTO_ALG_FLAG_SUPPORTED) != 0;
910 * Select a driver for an asym operation. The driver must
911 * support the necessary algorithm. The caller can constrain
912 * which device is selected with the flags parameter. The
913 * algorithm we use here is pretty stupid; just use the first
914 * driver that supports the algorithms we need. If there are
915 * multiple suitable drivers we choose the driver with the
916 * fewest active operations. We prefer hardware-backed
917 * drivers to software ones when either may be used.
919 static struct cryptocap *
920 crypto_select_kdriver(const struct cryptkop *krp, int flags)
922 struct cryptocap *cap, *best, *blocked;
925 CRYPTO_DRIVER_ASSERT();
928 * Look first for hardware crypto devices if permitted.
930 if (flags & CRYPTOCAP_F_HARDWARE)
931 match = CRYPTOCAP_F_HARDWARE;
933 match = CRYPTOCAP_F_SOFTWARE;
937 for (hid = 0; hid < crypto_drivers_num; hid++) {
938 cap = &crypto_drivers[hid];
940 * If it's not initialized, is in the process of
941 * going away, or is not appropriate (hardware
942 * or software based on match), then skip.
944 if (cap->cc_dev == NULL ||
945 (cap->cc_flags & CRYPTOCAP_F_CLEANUP) ||
946 (cap->cc_flags & match) == 0)
949 /* verify all the algorithms are supported. */
950 if (kdriver_suitable(cap, krp)) {
952 cap->cc_koperations < best->cc_koperations)
958 if (match == CRYPTOCAP_F_HARDWARE && (flags & CRYPTOCAP_F_SOFTWARE)) {
959 /* sort of an Algol 68-style for loop */
960 match = CRYPTOCAP_F_SOFTWARE;
967 * Dispatch an assymetric crypto request.
970 crypto_kinvoke(struct cryptkop *krp, int crid)
972 struct cryptocap *cap = NULL;
975 KASSERT(krp != NULL, ("%s: krp == NULL", __func__));
976 KASSERT(krp->krp_callback != NULL,
977 ("%s: krp->crp_callback == NULL", __func__));
979 CRYPTO_DRIVER_LOCK();
980 if ((crid & (CRYPTOCAP_F_HARDWARE | CRYPTOCAP_F_SOFTWARE)) == 0) {
981 cap = crypto_checkdriver(crid);
984 * Driver present, it must support the necessary
985 * algorithm and, if s/w drivers are excluded,
986 * it must be registered as hardware-backed.
988 if (!kdriver_suitable(cap, krp) ||
989 (!crypto_devallowsoft &&
990 (cap->cc_flags & CRYPTOCAP_F_HARDWARE) == 0))
995 * No requested driver; select based on crid flags.
997 if (!crypto_devallowsoft) /* NB: disallow s/w drivers */
998 crid &= ~CRYPTOCAP_F_SOFTWARE;
999 cap = crypto_select_kdriver(krp, crid);
1001 if (cap != NULL && !cap->cc_kqblocked) {
1002 krp->krp_hid = cap - crypto_drivers;
1003 cap->cc_koperations++;
1004 CRYPTO_DRIVER_UNLOCK();
1005 error = CRYPTODEV_KPROCESS(cap->cc_dev, krp, 0);
1006 CRYPTO_DRIVER_LOCK();
1007 if (error == ERESTART) {
1008 cap->cc_koperations--;
1009 CRYPTO_DRIVER_UNLOCK();
1014 * NB: cap is !NULL if device is blocked; in
1015 * that case return ERESTART so the operation
1016 * is resubmitted if possible.
1018 error = (cap == NULL) ? ENODEV : ERESTART;
1020 CRYPTO_DRIVER_UNLOCK();
1023 krp->krp_status = error;
1029 #ifdef CRYPTO_TIMING
1031 crypto_tstat(struct cryptotstat *ts, struct timespec *tv)
1033 struct timespec now, t;
1036 t.tv_sec = now.tv_sec - tv->tv_sec;
1037 t.tv_nsec = now.tv_nsec - tv->tv_nsec;
1038 if (t.tv_nsec < 0) {
1040 t.tv_nsec += 1000000000;
1042 timespecadd(&ts->acc, &t);
1043 if (timespeccmp(&t, &ts->min, <))
1045 if (timespeccmp(&t, &ts->max, >))
1054 * Dispatch a crypto request to the appropriate crypto devices.
1057 crypto_invoke(struct cryptocap *cap, struct cryptop *crp, int hint)
1060 KASSERT(crp != NULL, ("%s: crp == NULL", __func__));
1061 KASSERT(crp->crp_callback != NULL,
1062 ("%s: crp->crp_callback == NULL", __func__));
1063 KASSERT(crp->crp_desc != NULL, ("%s: crp->crp_desc == NULL", __func__));
1065 #ifdef CRYPTO_TIMING
1067 crypto_tstat(&cryptostats.cs_invoke, &crp->crp_tstamp);
1069 if (cap->cc_flags & CRYPTOCAP_F_CLEANUP) {
1070 struct cryptodesc *crd;
1074 * Driver has unregistered; migrate the session and return
1075 * an error to the caller so they'll resubmit the op.
1077 * XXX: What if there are more already queued requests for this
1080 crypto_freesession(crp->crp_sid);
1082 for (crd = crp->crp_desc; crd->crd_next; crd = crd->crd_next)
1083 crd->CRD_INI.cri_next = &(crd->crd_next->CRD_INI);
1085 /* XXX propagate flags from initial session? */
1086 if (crypto_newsession(&nid, &(crp->crp_desc->CRD_INI),
1087 CRYPTOCAP_F_HARDWARE | CRYPTOCAP_F_SOFTWARE) == 0)
1090 crp->crp_etype = EAGAIN;
1095 * Invoke the driver to process the request.
1097 return CRYPTODEV_PROCESS(cap->cc_dev, crp, hint);
1102 * Release a set of crypto descriptors.
1105 crypto_freereq(struct cryptop *crp)
1107 struct cryptodesc *crd;
1109 crypto_tdinfo_t tdinfo;
1110 struct cryptop *crp2;
1118 for (n = 0; n < ncpus; ++n) {
1119 tdinfo = &tdinfo_array[n];
1121 CRYPTO_Q_LOCK(tdinfo);
1122 TAILQ_FOREACH(crp2, &tdinfo->crp_q, crp_next) {
1123 KASSERT(crp2 != crp,
1124 ("Freeing cryptop from the crypto queue (%p).",
1127 CRYPTO_Q_UNLOCK(tdinfo);
1130 TAILQ_FOREACH(crp2, &crp_ret_q, crp_next) {
1131 KASSERT(crp2 != crp,
1132 ("Freeing cryptop from the return queue (%p).",
1135 CRYPTO_RETQ_UNLOCK();
1138 while ((crd = crp->crp_desc) != NULL) {
1139 crp->crp_desc = crd->crd_next;
1140 objcache_put(cryptodesc_oc, crd);
1142 objcache_put(cryptop_oc, crp);
1146 * Acquire a set of crypto descriptors.
1149 crypto_getreq(int num)
1151 struct cryptodesc *crd;
1152 struct cryptop *crp;
1154 crp = objcache_get(cryptop_oc, M_WAITOK);
1156 bzero(crp, sizeof (*crp));
1158 crd = objcache_get(cryptodesc_oc, M_WAITOK);
1160 crypto_freereq(crp);
1163 bzero(crd, sizeof (*crd));
1165 crd->crd_next = crp->crp_desc;
1166 crp->crp_desc = crd;
1173 * Invoke the callback on behalf of the driver.
1176 crypto_done(struct cryptop *crp)
1178 KASSERT((crp->crp_flags & CRYPTO_F_DONE) == 0,
1179 ("crypto_done: op already done, flags 0x%x", crp->crp_flags));
1180 crp->crp_flags |= CRYPTO_F_DONE;
1181 if (crp->crp_etype != 0)
1182 cryptostats.cs_errs++;
1183 #ifdef CRYPTO_TIMING
1185 crypto_tstat(&cryptostats.cs_done, &crp->crp_tstamp);
1188 * CBIMM means unconditionally do the callback immediately;
1189 * CBIFSYNC means do the callback immediately only if the
1190 * operation was done synchronously. Both are used to avoid
1191 * doing extraneous context switches; the latter is mostly
1192 * used with the software crypto driver.
1194 if ((crp->crp_flags & CRYPTO_F_CBIMM) ||
1195 ((crp->crp_flags & CRYPTO_F_CBIFSYNC) &&
1196 (CRYPTO_SESID2CAPS(crp->crp_sid) & CRYPTOCAP_F_SYNC))) {
1198 * Do the callback directly. This is ok when the
1199 * callback routine does very little (e.g. the
1200 * /dev/crypto callback method just does a wakeup).
1202 #ifdef CRYPTO_TIMING
1203 if (crypto_timing) {
1205 * NB: We must copy the timestamp before
1206 * doing the callback as the cryptop is
1207 * likely to be reclaimed.
1209 struct timespec t = crp->crp_tstamp;
1210 crypto_tstat(&cryptostats.cs_cb, &t);
1211 crp->crp_callback(crp);
1212 crypto_tstat(&cryptostats.cs_finis, &t);
1215 crp->crp_callback(crp);
1218 * Normal case; queue the callback for the thread.
1221 if (CRYPTO_RETQ_EMPTY())
1222 wakeup_one(&crp_ret_q); /* shared wait channel */
1223 TAILQ_INSERT_TAIL(&crp_ret_q, crp, crp_next);
1224 CRYPTO_RETQ_UNLOCK();
1229 * Invoke the callback on behalf of the driver.
1232 crypto_kdone(struct cryptkop *krp)
1234 struct cryptocap *cap;
1236 if (krp->krp_status != 0)
1237 cryptostats.cs_kerrs++;
1238 CRYPTO_DRIVER_LOCK();
1239 /* XXX: What if driver is loaded in the meantime? */
1240 if (krp->krp_hid < crypto_drivers_num) {
1241 cap = &crypto_drivers[krp->krp_hid];
1242 cap->cc_koperations--;
1243 KASSERT(cap->cc_koperations >= 0, ("cc_koperations < 0"));
1244 if (cap->cc_flags & CRYPTOCAP_F_CLEANUP)
1247 CRYPTO_DRIVER_UNLOCK();
1249 if (CRYPTO_RETQ_EMPTY())
1250 wakeup_one(&crp_ret_q); /* shared wait channel */
1251 TAILQ_INSERT_TAIL(&crp_ret_kq, krp, krp_next);
1252 CRYPTO_RETQ_UNLOCK();
1256 crypto_getfeat(int *featp)
1258 int hid, kalg, feat = 0;
1260 CRYPTO_DRIVER_LOCK();
1261 for (hid = 0; hid < crypto_drivers_num; hid++) {
1262 const struct cryptocap *cap = &crypto_drivers[hid];
1264 if ((cap->cc_flags & CRYPTOCAP_F_SOFTWARE) &&
1265 !crypto_devallowsoft) {
1268 for (kalg = 0; kalg <= CRK_ALGORITHM_MAX; kalg++)
1269 if (cap->cc_kalg[kalg] & CRYPTO_ALG_FLAG_SUPPORTED)
1272 CRYPTO_DRIVER_UNLOCK();
1278 * Terminate a thread at module unload. The process that
1279 * initiated this is waiting for us to signal that we're gone;
1280 * wake it up and exit. We use the driver table lock to insure
1281 * we don't do the wakeup before they're waiting. There is no
1282 * race here because the waiter sleeps on the proc lock for the
1283 * thread so it gets notified at the right time because of an
1284 * extra wakeup that's done in exit1().
1287 crypto_finis(void *chan)
1289 CRYPTO_DRIVER_LOCK();
1291 CRYPTO_DRIVER_UNLOCK();
1296 * Crypto thread, dispatches crypto requests.
1301 crypto_proc(void *arg)
1303 crypto_tdinfo_t tdinfo = arg;
1304 struct cryptop *crp, *submit;
1305 struct cryptkop *krp;
1306 struct cryptocap *cap;
1310 CRYPTO_Q_LOCK(tdinfo);
1312 curthread->td_flags |= TDF_CRYPTO;
1316 * Find the first element in the queue that can be
1317 * processed and look-ahead to see if multiple ops
1318 * are ready for the same driver.
1322 TAILQ_FOREACH(crp, &tdinfo->crp_q, crp_next) {
1323 hid = CRYPTO_SESID2HID(crp->crp_sid);
1324 cap = crypto_checkdriver(hid);
1326 * Driver cannot disappeared when there is an active
1329 KASSERT(cap != NULL, ("%s:%u Driver disappeared.",
1330 __func__, __LINE__));
1331 if (cap == NULL || cap->cc_dev == NULL) {
1332 /* Op needs to be migrated, process it. */
1337 if (!cap->cc_qblocked) {
1338 if (submit != NULL) {
1340 * We stop on finding another op,
1341 * regardless whether its for the same
1342 * driver or not. We could keep
1343 * searching the queue but it might be
1344 * better to just use a per-driver
1347 if (CRYPTO_SESID2HID(submit->crp_sid) == hid)
1348 hint = CRYPTO_HINT_MORE;
1352 if ((submit->crp_flags & CRYPTO_F_BATCH) == 0)
1354 /* keep scanning for more are q'd */
1358 if (submit != NULL) {
1359 TAILQ_REMOVE(&tdinfo->crp_q, submit, crp_next);
1360 hid = CRYPTO_SESID2HID(submit->crp_sid);
1361 cap = crypto_checkdriver(hid);
1362 KASSERT(cap != NULL, ("%s:%u Driver disappeared.",
1363 __func__, __LINE__));
1365 CRYPTO_Q_UNLOCK(tdinfo);
1366 result = crypto_invoke(cap, submit, hint);
1367 CRYPTO_Q_LOCK(tdinfo);
1369 if (result == ERESTART) {
1371 * The driver ran out of resources, mark the
1372 * driver ``blocked'' for cryptop's and put
1373 * the request back in the queue. It would
1374 * best to put the request back where we got
1375 * it but that's hard so for now we put it
1376 * at the front. This should be ok; putting
1377 * it at the end does not work.
1379 /* XXX validate sid again? */
1380 crypto_drivers[CRYPTO_SESID2HID(submit->crp_sid)].cc_qblocked = 1;
1381 TAILQ_INSERT_HEAD(&tdinfo->crp_q,
1383 cryptostats.cs_blocks++;
1387 /* As above, but for key ops */
1388 TAILQ_FOREACH(krp, &tdinfo->crp_kq, krp_next) {
1389 cap = crypto_checkdriver(krp->krp_hid);
1390 if (cap == NULL || cap->cc_dev == NULL) {
1392 * Operation needs to be migrated, invalidate
1393 * the assigned device so it will reselect a
1394 * new one below. Propagate the original
1395 * crid selection flags if supplied.
1397 krp->krp_hid = krp->krp_crid &
1398 (CRYPTOCAP_F_SOFTWARE|CRYPTOCAP_F_HARDWARE);
1399 if (krp->krp_hid == 0)
1401 CRYPTOCAP_F_SOFTWARE|CRYPTOCAP_F_HARDWARE;
1404 if (!cap->cc_kqblocked)
1408 TAILQ_REMOVE(&tdinfo->crp_kq, krp, krp_next);
1410 CRYPTO_Q_UNLOCK(tdinfo);
1411 result = crypto_kinvoke(krp, krp->krp_hid);
1412 CRYPTO_Q_LOCK(tdinfo);
1414 if (result == ERESTART) {
1416 * The driver ran out of resources, mark the
1417 * driver ``blocked'' for cryptkop's and put
1418 * the request back in the queue. It would
1419 * best to put the request back where we got
1420 * it but that's hard so for now we put it
1421 * at the front. This should be ok; putting
1422 * it at the end does not work.
1424 /* XXX validate sid again? */
1425 crypto_drivers[krp->krp_hid].cc_kqblocked = 1;
1426 TAILQ_INSERT_HEAD(&tdinfo->crp_kq,
1428 cryptostats.cs_kblocks++;
1432 if (submit == NULL && krp == NULL) {
1434 * Nothing more to be processed. Sleep until we're
1435 * woken because there are more ops to process.
1436 * This happens either by submission or by a driver
1437 * becoming unblocked and notifying us through
1438 * crypto_unblock. Note that when we wakeup we
1439 * start processing each queue again from the
1440 * front. It's not clear that it's important to
1441 * preserve this ordering since ops may finish
1442 * out of order if dispatched to different devices
1443 * and some become blocked while others do not.
1445 tdinfo->crp_sleep = 1;
1446 lksleep (&tdinfo->crp_q, &tdinfo->crp_lock,
1447 0, "crypto_wait", 0);
1448 tdinfo->crp_sleep = 0;
1449 if (tdinfo->crp_td == NULL)
1451 cryptostats.cs_intrs++;
1454 CRYPTO_Q_UNLOCK(tdinfo);
1456 crypto_finis(&tdinfo->crp_q);
1460 * Crypto returns thread, does callbacks for processed crypto requests.
1461 * Callbacks are done here, rather than in the crypto drivers, because
1462 * callbacks typically are expensive and would slow interrupt handling.
1467 crypto_ret_proc(void *dummy __unused)
1469 struct cryptop *crpt;
1470 struct cryptkop *krpt;
1475 /* Harvest return q's for completed ops */
1476 crpt = TAILQ_FIRST(&crp_ret_q);
1478 TAILQ_REMOVE(&crp_ret_q, crpt, crp_next);
1480 krpt = TAILQ_FIRST(&crp_ret_kq);
1482 TAILQ_REMOVE(&crp_ret_kq, krpt, krp_next);
1484 if (crpt != NULL || krpt != NULL) {
1485 CRYPTO_RETQ_UNLOCK();
1487 * Run callbacks unlocked.
1490 #ifdef CRYPTO_TIMING
1491 if (crypto_timing) {
1493 * NB: We must copy the timestamp before
1494 * doing the callback as the cryptop is
1495 * likely to be reclaimed.
1497 struct timespec t = crpt->crp_tstamp;
1498 crypto_tstat(&cryptostats.cs_cb, &t);
1499 crpt->crp_callback(crpt);
1500 crypto_tstat(&cryptostats.cs_finis, &t);
1503 crpt->crp_callback(crpt);
1506 krpt->krp_callback(krpt);
1510 * Nothing more to be processed. Sleep until we're
1511 * woken because there are more returns to process.
1513 lksleep (&crp_ret_q, &crypto_ret_q_lock,
1514 0, "crypto_ret_wait", 0);
1515 if (cryptoretthread == NULL)
1517 cryptostats.cs_rets++;
1520 CRYPTO_RETQ_UNLOCK();
1522 crypto_finis(&crp_ret_q);
1527 db_show_drivers(void)
1531 db_printf("%12s %4s %4s %8s %2s %2s\n"
1539 for (hid = 0; hid < crypto_drivers_num; hid++) {
1540 const struct cryptocap *cap = &crypto_drivers[hid];
1541 if (cap->cc_dev == NULL)
1543 db_printf("%-12s %4u %4u %08x %2u %2u\n"
1544 , device_get_nameunit(cap->cc_dev)
1546 , cap->cc_koperations
1554 DB_SHOW_COMMAND(crypto, db_show_crypto)
1556 crypto_tdinfo_t tdinfo;
1557 struct cryptop *crp;
1563 db_printf("%4s %8s %4s %4s %4s %4s %8s %8s\n",
1564 "HID", "Caps", "Ilen", "Olen", "Etype", "Flags",
1565 "Desc", "Callback");
1567 for (n = 0; n < ncpus; ++n) {
1568 tdinfo = &tdinfo_array[n];
1570 TAILQ_FOREACH(crp, &tdinfo->crp_q, crp_next) {
1571 db_printf("%4u %08x %4u %4u %4u %04x %8p %8p\n"
1572 , (int) CRYPTO_SESID2HID(crp->crp_sid)
1573 , (int) CRYPTO_SESID2CAPS(crp->crp_sid)
1574 , crp->crp_ilen, crp->crp_olen
1582 if (!TAILQ_EMPTY(&crp_ret_q)) {
1583 db_printf("\n%4s %4s %4s %8s\n",
1584 "HID", "Etype", "Flags", "Callback");
1585 TAILQ_FOREACH(crp, &crp_ret_q, crp_next) {
1586 db_printf("%4u %4u %04x %8p\n"
1587 , (int) CRYPTO_SESID2HID(crp->crp_sid)
1596 DB_SHOW_COMMAND(kcrypto, db_show_kcrypto)
1598 crypto_tdinfo_t tdinfo;
1599 struct cryptkop *krp;
1605 db_printf("%4s %5s %4s %4s %8s %4s %8s\n",
1606 "Op", "Status", "#IP", "#OP", "CRID", "HID", "Callback");
1608 for (n = 0; n < ncpus; ++n) {
1609 tdinfo = &tdinfo_array[n];
1611 TAILQ_FOREACH(krp, &tdinfo->crp_kq, krp_next) {
1612 db_printf("%4u %5u %4u %4u %08x %4u %8p\n"
1615 , krp->krp_iparams, krp->krp_oparams
1616 , krp->krp_crid, krp->krp_hid
1621 if (!TAILQ_EMPTY(&crp_ret_q)) {
1622 db_printf("%4s %5s %8s %4s %8s\n",
1623 "Op", "Status", "CRID", "HID", "Callback");
1624 TAILQ_FOREACH(krp, &crp_ret_kq, krp_next) {
1625 db_printf("%4u %5u %08x %4u %8p\n"
1628 , krp->krp_crid, krp->krp_hid
1636 int crypto_modevent(module_t mod, int type, void *unused);
1639 * Initialization code, both for static and dynamic loading.
1640 * Note this is not invoked with the usual MODULE_DECLARE
1641 * mechanism but instead is listed as a dependency by the
1642 * cryptosoft driver. This guarantees proper ordering of
1643 * calls on module load/unload.
1646 crypto_modevent(module_t mod, int type, void *unused)
1652 error = crypto_init();
1653 if (error == 0 && bootverbose)
1654 kprintf("crypto: <crypto core>\n");
1657 /*XXX disallow if active sessions */
1664 MODULE_VERSION(crypto, 1);
1665 MODULE_DEPEND(crypto, zlib, 1, 1, 1);